1 // SPDX-License-Identifier: ISC
2 /*
3  * Copyright (c) 2010 Broadcom Corporation
4  */
5 
6 #include <linux/types.h>
7 #include <linux/atomic.h>
8 #include <linux/kernel.h>
9 #include <linux/kthread.h>
10 #include <linux/printk.h>
11 #include <linux/pci_ids.h>
12 #include <linux/netdevice.h>
13 #include <linux/interrupt.h>
14 #include <linux/sched/signal.h>
15 #include <linux/mmc/sdio.h>
16 #include <linux/mmc/sdio_ids.h>
17 #include <linux/mmc/sdio_func.h>
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/core.h>
20 #include <linux/semaphore.h>
21 #include <linux/firmware.h>
22 #include <linux/module.h>
23 #include <linux/bcma/bcma.h>
24 #include <linux/debugfs.h>
25 #include <linux/vmalloc.h>
26 #include <asm/unaligned.h>
27 #include <defs.h>
28 #include <brcmu_wifi.h>
29 #include <brcmu_utils.h>
30 #include <brcm_hw_ids.h>
31 #include <soc.h>
32 #include "sdio.h"
33 #include "chip.h"
34 #include "firmware.h"
35 #include "core.h"
36 #include "common.h"
37 #include "bcdc.h"
38 
39 #define DCMD_RESP_TIMEOUT	msecs_to_jiffies(2500)
40 #define CTL_DONE_TIMEOUT	msecs_to_jiffies(2500)
41 
42 /* watermark expressed in number of words */
43 #define DEFAULT_F2_WATERMARK    0x8
44 #define CY_4373_F2_WATERMARK    0x40
45 #define CY_4373_F1_MESBUSYCTRL  (CY_4373_F2_WATERMARK | SBSDIO_MESBUSYCTRL_ENAB)
46 #define CY_43012_F2_WATERMARK    0x60
47 #define CY_43012_MES_WATERMARK  0x50
48 #define CY_43012_MESBUSYCTRL    (CY_43012_MES_WATERMARK | \
49 				 SBSDIO_MESBUSYCTRL_ENAB)
50 #define CY_4339_F2_WATERMARK    48
51 #define CY_4339_MES_WATERMARK	80
52 #define CY_4339_MESBUSYCTRL	(CY_4339_MES_WATERMARK | \
53 				 SBSDIO_MESBUSYCTRL_ENAB)
54 #define CY_43455_F2_WATERMARK	0x60
55 #define CY_43455_MES_WATERMARK	0x50
56 #define CY_43455_MESBUSYCTRL	(CY_43455_MES_WATERMARK | \
57 				 SBSDIO_MESBUSYCTRL_ENAB)
58 #define CY_435X_F2_WATERMARK	0x40
59 #define CY_435X_F1_MESBUSYCTRL	(CY_435X_F2_WATERMARK | \
60 				 SBSDIO_MESBUSYCTRL_ENAB)
61 
62 #ifdef DEBUG
63 
64 #define BRCMF_TRAP_INFO_SIZE	80
65 
66 #define CBUF_LEN	(128)
67 
68 /* Device console log buffer state */
69 #define CONSOLE_BUFFER_MAX	2024
70 
71 struct rte_log_le {
72 	__le32 buf;		/* Can't be pointer on (64-bit) hosts */
73 	__le32 buf_size;
74 	__le32 idx;
75 	char *_buf_compat;	/* Redundant pointer for backward compat. */
76 };
77 
78 struct rte_console {
79 	/* Virtual UART
80 	 * When there is no UART (e.g. Quickturn),
81 	 * the host should write a complete
82 	 * input line directly into cbuf and then write
83 	 * the length into vcons_in.
84 	 * This may also be used when there is a real UART
85 	 * (at risk of conflicting with
86 	 * the real UART).  vcons_out is currently unused.
87 	 */
88 	uint vcons_in;
89 	uint vcons_out;
90 
91 	/* Output (logging) buffer
92 	 * Console output is written to a ring buffer log_buf at index log_idx.
93 	 * The host may read the output when it sees log_idx advance.
94 	 * Output will be lost if the output wraps around faster than the host
95 	 * polls.
96 	 */
97 	struct rte_log_le log_le;
98 
99 	/* Console input line buffer
100 	 * Characters are read one at a time into cbuf
101 	 * until <CR> is received, then
102 	 * the buffer is processed as a command line.
103 	 * Also used for virtual UART.
104 	 */
105 	uint cbuf_idx;
106 	char cbuf[CBUF_LEN];
107 };
108 
109 #endif				/* DEBUG */
110 #include <chipcommon.h>
111 
112 #include "bus.h"
113 #include "debug.h"
114 #include "tracepoint.h"
115 
116 #define TXQLEN		2048	/* bulk tx queue length */
117 #define TXHI		(TXQLEN - 256)	/* turn on flow control above TXHI */
118 #define TXLOW		(TXHI - 256)	/* turn off flow control below TXLOW */
119 #define PRIOMASK	7
120 
121 #define TXRETRIES	2	/* # of retries for tx frames */
122 
123 #define BRCMF_RXBOUND	50	/* Default for max rx frames in
124 				 one scheduling */
125 
126 #define BRCMF_TXBOUND	20	/* Default for max tx frames in
127 				 one scheduling */
128 
129 #define BRCMF_TXMINMAX	1	/* Max tx frames if rx still pending */
130 
131 #define MEMBLOCK	2048	/* Block size used for downloading
132 				 of dongle image */
133 #define MAX_DATA_BUF	(32 * 1024)	/* Must be large enough to hold
134 				 biggest possible glom */
135 
136 #define BRCMF_FIRSTREAD	(1 << 6)
137 
138 /* SBSDIO_DEVICE_CTL */
139 
140 /* 1: device will assert busy signal when receiving CMD53 */
141 #define SBSDIO_DEVCTL_SETBUSY		0x01
142 /* 1: assertion of sdio interrupt is synchronous to the sdio clock */
143 #define SBSDIO_DEVCTL_SPI_INTR_SYNC	0x02
144 /* 1: mask all interrupts to host except the chipActive (rev 8) */
145 #define SBSDIO_DEVCTL_CA_INT_ONLY	0x04
146 /* 1: isolate internal sdio signals, put external pads in tri-state; requires
147  * sdio bus power cycle to clear (rev 9) */
148 #define SBSDIO_DEVCTL_PADS_ISO		0x08
149 /* 1: enable F2 Watermark */
150 #define SBSDIO_DEVCTL_F2WM_ENAB		0x10
151 /* Force SD->SB reset mapping (rev 11) */
152 #define SBSDIO_DEVCTL_SB_RST_CTL	0x30
153 /*   Determined by CoreControl bit */
154 #define SBSDIO_DEVCTL_RST_CORECTL	0x00
155 /*   Force backplane reset */
156 #define SBSDIO_DEVCTL_RST_BPRESET	0x10
157 /*   Force no backplane reset */
158 #define SBSDIO_DEVCTL_RST_NOBPRESET	0x20
159 
160 /* direct(mapped) cis space */
161 
162 /* MAPPED common CIS address */
163 #define SBSDIO_CIS_BASE_COMMON		0x1000
164 /* maximum bytes in one CIS */
165 #define SBSDIO_CIS_SIZE_LIMIT		0x200
166 /* cis offset addr is < 17 bits */
167 #define SBSDIO_CIS_OFT_ADDR_MASK	0x1FFFF
168 
169 /* manfid tuple length, include tuple, link bytes */
170 #define SBSDIO_CIS_MANFID_TUPLE_LEN	6
171 
172 #define SD_REG(field) \
173 		(offsetof(struct sdpcmd_regs, field))
174 
175 /* SDIO function 1 register CHIPCLKCSR */
176 /* Force ALP request to backplane */
177 #define SBSDIO_FORCE_ALP		0x01
178 /* Force HT request to backplane */
179 #define SBSDIO_FORCE_HT			0x02
180 /* Force ILP request to backplane */
181 #define SBSDIO_FORCE_ILP		0x04
182 /* Make ALP ready (power up xtal) */
183 #define SBSDIO_ALP_AVAIL_REQ		0x08
184 /* Make HT ready (power up PLL) */
185 #define SBSDIO_HT_AVAIL_REQ		0x10
186 /* Squelch clock requests from HW */
187 #define SBSDIO_FORCE_HW_CLKREQ_OFF	0x20
188 /* Status: ALP is ready */
189 #define SBSDIO_ALP_AVAIL		0x40
190 /* Status: HT is ready */
191 #define SBSDIO_HT_AVAIL			0x80
192 #define SBSDIO_CSR_MASK			0x1F
193 #define SBSDIO_AVBITS		(SBSDIO_HT_AVAIL | SBSDIO_ALP_AVAIL)
194 #define SBSDIO_ALPAV(regval)	((regval) & SBSDIO_AVBITS)
195 #define SBSDIO_HTAV(regval)	(((regval) & SBSDIO_AVBITS) == SBSDIO_AVBITS)
196 #define SBSDIO_ALPONLY(regval)	(SBSDIO_ALPAV(regval) && !SBSDIO_HTAV(regval))
197 #define SBSDIO_CLKAV(regval, alponly) \
198 	(SBSDIO_ALPAV(regval) && (alponly ? 1 : SBSDIO_HTAV(regval)))
199 
200 /* intstatus */
201 #define I_SMB_SW0	(1 << 0)	/* To SB Mail S/W interrupt 0 */
202 #define I_SMB_SW1	(1 << 1)	/* To SB Mail S/W interrupt 1 */
203 #define I_SMB_SW2	(1 << 2)	/* To SB Mail S/W interrupt 2 */
204 #define I_SMB_SW3	(1 << 3)	/* To SB Mail S/W interrupt 3 */
205 #define I_SMB_SW_MASK	0x0000000f	/* To SB Mail S/W interrupts mask */
206 #define I_SMB_SW_SHIFT	0	/* To SB Mail S/W interrupts shift */
207 #define I_HMB_SW0	(1 << 4)	/* To Host Mail S/W interrupt 0 */
208 #define I_HMB_SW1	(1 << 5)	/* To Host Mail S/W interrupt 1 */
209 #define I_HMB_SW2	(1 << 6)	/* To Host Mail S/W interrupt 2 */
210 #define I_HMB_SW3	(1 << 7)	/* To Host Mail S/W interrupt 3 */
211 #define I_HMB_SW_MASK	0x000000f0	/* To Host Mail S/W interrupts mask */
212 #define I_HMB_SW_SHIFT	4	/* To Host Mail S/W interrupts shift */
213 #define I_WR_OOSYNC	(1 << 8)	/* Write Frame Out Of Sync */
214 #define I_RD_OOSYNC	(1 << 9)	/* Read Frame Out Of Sync */
215 #define	I_PC		(1 << 10)	/* descriptor error */
216 #define	I_PD		(1 << 11)	/* data error */
217 #define	I_DE		(1 << 12)	/* Descriptor protocol Error */
218 #define	I_RU		(1 << 13)	/* Receive descriptor Underflow */
219 #define	I_RO		(1 << 14)	/* Receive fifo Overflow */
220 #define	I_XU		(1 << 15)	/* Transmit fifo Underflow */
221 #define	I_RI		(1 << 16)	/* Receive Interrupt */
222 #define I_BUSPWR	(1 << 17)	/* SDIO Bus Power Change (rev 9) */
223 #define I_XMTDATA_AVAIL (1 << 23)	/* bits in fifo */
224 #define	I_XI		(1 << 24)	/* Transmit Interrupt */
225 #define I_RF_TERM	(1 << 25)	/* Read Frame Terminate */
226 #define I_WF_TERM	(1 << 26)	/* Write Frame Terminate */
227 #define I_PCMCIA_XU	(1 << 27)	/* PCMCIA Transmit FIFO Underflow */
228 #define I_SBINT		(1 << 28)	/* sbintstatus Interrupt */
229 #define I_CHIPACTIVE	(1 << 29)	/* chip from doze to active state */
230 #define I_SRESET	(1 << 30)	/* CCCR RES interrupt */
231 #define I_IOE2		(1U << 31)	/* CCCR IOE2 Bit Changed */
232 #define	I_ERRORS	(I_PC | I_PD | I_DE | I_RU | I_RO | I_XU)
233 #define I_DMA		(I_RI | I_XI | I_ERRORS)
234 
235 /* corecontrol */
236 #define CC_CISRDY		(1 << 0)	/* CIS Ready */
237 #define CC_BPRESEN		(1 << 1)	/* CCCR RES signal */
238 #define CC_F2RDY		(1 << 2)	/* set CCCR IOR2 bit */
239 #define CC_CLRPADSISO		(1 << 3)	/* clear SDIO pads isolation */
240 #define CC_XMTDATAAVAIL_MODE	(1 << 4)
241 #define CC_XMTDATAAVAIL_CTRL	(1 << 5)
242 
243 /* SDA_FRAMECTRL */
244 #define SFC_RF_TERM	(1 << 0)	/* Read Frame Terminate */
245 #define SFC_WF_TERM	(1 << 1)	/* Write Frame Terminate */
246 #define SFC_CRC4WOOS	(1 << 2)	/* CRC error for write out of sync */
247 #define SFC_ABORTALL	(1 << 3)	/* Abort all in-progress frames */
248 
249 /*
250  * Software allocation of To SB Mailbox resources
251  */
252 
253 /* tosbmailbox bits corresponding to intstatus bits */
254 #define SMB_NAK		(1 << 0)	/* Frame NAK */
255 #define SMB_INT_ACK	(1 << 1)	/* Host Interrupt ACK */
256 #define SMB_USE_OOB	(1 << 2)	/* Use OOB Wakeup */
257 #define SMB_DEV_INT	(1 << 3)	/* Miscellaneous Interrupt */
258 
259 /* tosbmailboxdata */
260 #define SMB_DATA_VERSION_SHIFT	16	/* host protocol version */
261 
262 /*
263  * Software allocation of To Host Mailbox resources
264  */
265 
266 /* intstatus bits */
267 #define I_HMB_FC_STATE	I_HMB_SW0	/* Flow Control State */
268 #define I_HMB_FC_CHANGE	I_HMB_SW1	/* Flow Control State Changed */
269 #define I_HMB_FRAME_IND	I_HMB_SW2	/* Frame Indication */
270 #define I_HMB_HOST_INT	I_HMB_SW3	/* Miscellaneous Interrupt */
271 
272 /* tohostmailboxdata */
273 #define HMB_DATA_NAKHANDLED	0x0001	/* retransmit NAK'd frame */
274 #define HMB_DATA_DEVREADY	0x0002	/* talk to host after enable */
275 #define HMB_DATA_FC		0x0004	/* per prio flowcontrol update flag */
276 #define HMB_DATA_FWREADY	0x0008	/* fw ready for protocol activity */
277 #define HMB_DATA_FWHALT		0x0010	/* firmware halted */
278 
279 #define HMB_DATA_FCDATA_MASK	0xff000000
280 #define HMB_DATA_FCDATA_SHIFT	24
281 
282 #define HMB_DATA_VERSION_MASK	0x00ff0000
283 #define HMB_DATA_VERSION_SHIFT	16
284 
285 /*
286  * Software-defined protocol header
287  */
288 
289 /* Current protocol version */
290 #define SDPCM_PROT_VERSION	4
291 
292 /*
293  * Shared structure between dongle and the host.
294  * The structure contains pointers to trap or assert information.
295  */
296 #define SDPCM_SHARED_VERSION       0x0003
297 #define SDPCM_SHARED_VERSION_MASK  0x00FF
298 #define SDPCM_SHARED_ASSERT_BUILT  0x0100
299 #define SDPCM_SHARED_ASSERT        0x0200
300 #define SDPCM_SHARED_TRAP          0x0400
301 
302 /* Space for header read, limit for data packets */
303 #define MAX_HDR_READ	(1 << 6)
304 #define MAX_RX_DATASZ	2048
305 
306 /* Bump up limit on waiting for HT to account for first startup;
307  * if the image is doing a CRC calculation before programming the PMU
308  * for HT availability, it could take a couple hundred ms more, so
309  * max out at a 1 second (1000000us).
310  */
311 #undef PMU_MAX_TRANSITION_DLY
312 #define PMU_MAX_TRANSITION_DLY 1000000
313 
314 /* Value for ChipClockCSR during initial setup */
315 #define BRCMF_INIT_CLKCTL1	(SBSDIO_FORCE_HW_CLKREQ_OFF |	\
316 					SBSDIO_ALP_AVAIL_REQ)
317 
318 /* Flags for SDH calls */
319 #define F2SYNC	(SDIO_REQ_4BYTE | SDIO_REQ_FIXED)
320 
321 #define BRCMF_IDLE_ACTIVE	0	/* Do not request any SD clock change
322 					 * when idle
323 					 */
324 #define BRCMF_IDLE_INTERVAL	1
325 
326 #define KSO_WAIT_US 50
327 #define MAX_KSO_ATTEMPTS (PMU_MAX_TRANSITION_DLY/KSO_WAIT_US)
328 #define BRCMF_SDIO_MAX_ACCESS_ERRORS	5
329 
330 #ifdef DEBUG
331 /* Device console log buffer state */
332 struct brcmf_console {
333 	uint count;		/* Poll interval msec counter */
334 	uint log_addr;		/* Log struct address (fixed) */
335 	struct rte_log_le log_le;	/* Log struct (host copy) */
336 	uint bufsize;		/* Size of log buffer */
337 	u8 *buf;		/* Log buffer (host copy) */
338 	uint last;		/* Last buffer read index */
339 };
340 
341 struct brcmf_trap_info {
342 	__le32		type;
343 	__le32		epc;
344 	__le32		cpsr;
345 	__le32		spsr;
346 	__le32		r0;	/* a1 */
347 	__le32		r1;	/* a2 */
348 	__le32		r2;	/* a3 */
349 	__le32		r3;	/* a4 */
350 	__le32		r4;	/* v1 */
351 	__le32		r5;	/* v2 */
352 	__le32		r6;	/* v3 */
353 	__le32		r7;	/* v4 */
354 	__le32		r8;	/* v5 */
355 	__le32		r9;	/* sb/v6 */
356 	__le32		r10;	/* sl/v7 */
357 	__le32		r11;	/* fp/v8 */
358 	__le32		r12;	/* ip */
359 	__le32		r13;	/* sp */
360 	__le32		r14;	/* lr */
361 	__le32		pc;	/* r15 */
362 };
363 #endif				/* DEBUG */
364 
365 struct sdpcm_shared {
366 	u32 flags;
367 	u32 trap_addr;
368 	u32 assert_exp_addr;
369 	u32 assert_file_addr;
370 	u32 assert_line;
371 	u32 console_addr;	/* Address of struct rte_console */
372 	u32 msgtrace_addr;
373 	u8 tag[32];
374 	u32 brpt_addr;
375 };
376 
377 struct sdpcm_shared_le {
378 	__le32 flags;
379 	__le32 trap_addr;
380 	__le32 assert_exp_addr;
381 	__le32 assert_file_addr;
382 	__le32 assert_line;
383 	__le32 console_addr;	/* Address of struct rte_console */
384 	__le32 msgtrace_addr;
385 	u8 tag[32];
386 	__le32 brpt_addr;
387 };
388 
389 /* dongle SDIO bus specific header info */
390 struct brcmf_sdio_hdrinfo {
391 	u8 seq_num;
392 	u8 channel;
393 	u16 len;
394 	u16 len_left;
395 	u16 len_nxtfrm;
396 	u8 dat_offset;
397 	bool lastfrm;
398 	u16 tail_pad;
399 };
400 
401 /*
402  * hold counter variables
403  */
404 struct brcmf_sdio_count {
405 	uint intrcount;		/* Count of device interrupt callbacks */
406 	uint lastintrs;		/* Count as of last watchdog timer */
407 	uint pollcnt;		/* Count of active polls */
408 	uint regfails;		/* Count of R_REG failures */
409 	uint tx_sderrs;		/* Count of tx attempts with sd errors */
410 	uint fcqueued;		/* Tx packets that got queued */
411 	uint rxrtx;		/* Count of rtx requests (NAK to dongle) */
412 	uint rx_toolong;	/* Receive frames too long to receive */
413 	uint rxc_errors;	/* SDIO errors when reading control frames */
414 	uint rx_hdrfail;	/* SDIO errors on header reads */
415 	uint rx_badhdr;		/* Bad received headers (roosync?) */
416 	uint rx_badseq;		/* Mismatched rx sequence number */
417 	uint fc_rcvd;		/* Number of flow-control events received */
418 	uint fc_xoff;		/* Number which turned on flow-control */
419 	uint fc_xon;		/* Number which turned off flow-control */
420 	uint rxglomfail;	/* Failed deglom attempts */
421 	uint rxglomframes;	/* Number of glom frames (superframes) */
422 	uint rxglompkts;	/* Number of packets from glom frames */
423 	uint f2rxhdrs;		/* Number of header reads */
424 	uint f2rxdata;		/* Number of frame data reads */
425 	uint f2txdata;		/* Number of f2 frame writes */
426 	uint f1regdata;		/* Number of f1 register accesses */
427 	uint tickcnt;		/* Number of watchdog been schedule */
428 	ulong tx_ctlerrs;	/* Err of sending ctrl frames */
429 	ulong tx_ctlpkts;	/* Ctrl frames sent to dongle */
430 	ulong rx_ctlerrs;	/* Err of processing rx ctrl frames */
431 	ulong rx_ctlpkts;	/* Ctrl frames processed from dongle */
432 	ulong rx_readahead_cnt;	/* packets where header read-ahead was used */
433 };
434 
435 /* misc chip info needed by some of the routines */
436 /* Private data for SDIO bus interaction */
437 struct brcmf_sdio {
438 	struct brcmf_sdio_dev *sdiodev;	/* sdio device handler */
439 	struct brcmf_chip *ci;	/* Chip info struct */
440 	struct brcmf_core *sdio_core; /* sdio core info struct */
441 
442 	u32 hostintmask;	/* Copy of Host Interrupt Mask */
443 	atomic_t intstatus;	/* Intstatus bits (events) pending */
444 	atomic_t fcstate;	/* State of dongle flow-control */
445 
446 	uint blocksize;		/* Block size of SDIO transfers */
447 	uint roundup;		/* Max roundup limit */
448 
449 	struct pktq txq;	/* Queue length used for flow-control */
450 	u8 flowcontrol;	/* per prio flow control bitmask */
451 	u8 tx_seq;		/* Transmit sequence number (next) */
452 	u8 tx_max;		/* Maximum transmit sequence allowed */
453 
454 	u8 *hdrbuf;		/* buffer for handling rx frame */
455 	u8 *rxhdr;		/* Header of current rx frame (in hdrbuf) */
456 	u8 rx_seq;		/* Receive sequence number (expected) */
457 	struct brcmf_sdio_hdrinfo cur_read;
458 				/* info of current read frame */
459 	bool rxskip;		/* Skip receive (awaiting NAK ACK) */
460 	bool rxpending;		/* Data frame pending in dongle */
461 
462 	uint rxbound;		/* Rx frames to read before resched */
463 	uint txbound;		/* Tx frames to send before resched */
464 	uint txminmax;
465 
466 	struct sk_buff *glomd;	/* Packet containing glomming descriptor */
467 	struct sk_buff_head glom; /* Packet list for glommed superframe */
468 
469 	u8 *rxbuf;		/* Buffer for receiving control packets */
470 	uint rxblen;		/* Allocated length of rxbuf */
471 	u8 *rxctl;		/* Aligned pointer into rxbuf */
472 	u8 *rxctl_orig;		/* pointer for freeing rxctl */
473 	uint rxlen;		/* Length of valid data in buffer */
474 	spinlock_t rxctl_lock;	/* protection lock for ctrl frame resources */
475 
476 	u8 sdpcm_ver;	/* Bus protocol reported by dongle */
477 
478 	bool intr;		/* Use interrupts */
479 	bool poll;		/* Use polling */
480 	atomic_t ipend;		/* Device interrupt is pending */
481 	uint spurious;		/* Count of spurious interrupts */
482 	uint pollrate;		/* Ticks between device polls */
483 	uint polltick;		/* Tick counter */
484 
485 #ifdef DEBUG
486 	uint console_interval;
487 	struct brcmf_console console;	/* Console output polling support */
488 	uint console_addr;	/* Console address from shared struct */
489 #endif				/* DEBUG */
490 
491 	uint clkstate;		/* State of sd and backplane clock(s) */
492 	s32 idletime;		/* Control for activity timeout */
493 	s32 idlecount;		/* Activity timeout counter */
494 	s32 idleclock;		/* How to set bus driver when idle */
495 	bool rxflow_mode;	/* Rx flow control mode */
496 	bool rxflow;		/* Is rx flow control on */
497 	bool alp_only;		/* Don't use HT clock (ALP only) */
498 
499 	u8 *ctrl_frame_buf;
500 	u16 ctrl_frame_len;
501 	bool ctrl_frame_stat;
502 	int ctrl_frame_err;
503 
504 	spinlock_t txq_lock;		/* protect bus->txq */
505 	wait_queue_head_t ctrl_wait;
506 	wait_queue_head_t dcmd_resp_wait;
507 
508 	struct timer_list timer;
509 	struct completion watchdog_wait;
510 	struct task_struct *watchdog_tsk;
511 	bool wd_active;
512 
513 	struct workqueue_struct *brcmf_wq;
514 	struct work_struct datawork;
515 	bool dpc_triggered;
516 	bool dpc_running;
517 
518 	bool txoff;		/* Transmit flow-controlled */
519 	struct brcmf_sdio_count sdcnt;
520 	bool sr_enabled; /* SaveRestore enabled */
521 	bool sleeping;
522 
523 	u8 tx_hdrlen;		/* sdio bus header length for tx packet */
524 	bool txglom;		/* host tx glomming enable flag */
525 	u16 head_align;		/* buffer pointer alignment */
526 	u16 sgentry_align;	/* scatter-gather buffer alignment */
527 };
528 
529 /* clkstate */
530 #define CLK_NONE	0
531 #define CLK_SDONLY	1
532 #define CLK_PENDING	2
533 #define CLK_AVAIL	3
534 
535 #ifdef DEBUG
536 static int qcount[NUMPRIO];
537 #endif				/* DEBUG */
538 
539 #define DEFAULT_SDIO_DRIVE_STRENGTH	6	/* in milliamps */
540 
541 #define RETRYCHAN(chan) ((chan) == SDPCM_EVENT_CHANNEL)
542 
543 /* Limit on rounding up frames */
544 static const uint max_roundup = 512;
545 
546 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
547 #define ALIGNMENT  8
548 #else
549 #define ALIGNMENT  4
550 #endif
551 
552 enum brcmf_sdio_frmtype {
553 	BRCMF_SDIO_FT_NORMAL,
554 	BRCMF_SDIO_FT_SUPER,
555 	BRCMF_SDIO_FT_SUB,
556 };
557 
558 #define SDIOD_DRVSTR_KEY(chip, pmu)     (((unsigned int)(chip) << 16) | (pmu))
559 
560 /* SDIO Pad drive strength to select value mappings */
561 struct sdiod_drive_str {
562 	u8 strength;	/* Pad Drive Strength in mA */
563 	u8 sel;		/* Chip-specific select value */
564 };
565 
566 /* SDIO Drive Strength to sel value table for PMU Rev 11 (1.8V) */
567 static const struct sdiod_drive_str sdiod_drvstr_tab1_1v8[] = {
568 	{32, 0x6},
569 	{26, 0x7},
570 	{22, 0x4},
571 	{16, 0x5},
572 	{12, 0x2},
573 	{8, 0x3},
574 	{4, 0x0},
575 	{0, 0x1}
576 };
577 
578 /* SDIO Drive Strength to sel value table for PMU Rev 13 (1.8v) */
579 static const struct sdiod_drive_str sdiod_drive_strength_tab5_1v8[] = {
580 	{6, 0x7},
581 	{5, 0x6},
582 	{4, 0x5},
583 	{3, 0x4},
584 	{2, 0x2},
585 	{1, 0x1},
586 	{0, 0x0}
587 };
588 
589 /* SDIO Drive Strength to sel value table for PMU Rev 17 (1.8v) */
590 static const struct sdiod_drive_str sdiod_drvstr_tab6_1v8[] = {
591 	{3, 0x3},
592 	{2, 0x2},
593 	{1, 0x1},
594 	{0, 0x0} };
595 
596 /* SDIO Drive Strength to sel value table for 43143 PMU Rev 17 (3.3V) */
597 static const struct sdiod_drive_str sdiod_drvstr_tab2_3v3[] = {
598 	{16, 0x7},
599 	{12, 0x5},
600 	{8,  0x3},
601 	{4,  0x1}
602 };
603 
604 BRCMF_FW_DEF(43143, "brcmfmac43143-sdio");
605 BRCMF_FW_DEF(43241B0, "brcmfmac43241b0-sdio");
606 BRCMF_FW_DEF(43241B4, "brcmfmac43241b4-sdio");
607 BRCMF_FW_DEF(43241B5, "brcmfmac43241b5-sdio");
608 BRCMF_FW_DEF(4329, "brcmfmac4329-sdio");
609 BRCMF_FW_DEF(4330, "brcmfmac4330-sdio");
610 BRCMF_FW_DEF(4334, "brcmfmac4334-sdio");
611 BRCMF_FW_DEF(43340, "brcmfmac43340-sdio");
612 BRCMF_FW_DEF(4335, "brcmfmac4335-sdio");
613 BRCMF_FW_DEF(43362, "brcmfmac43362-sdio");
614 BRCMF_FW_DEF(4339, "brcmfmac4339-sdio");
615 BRCMF_FW_DEF(43430A0, "brcmfmac43430a0-sdio");
616 /* Note the names are not postfixed with a1 for backward compatibility */
617 BRCMF_FW_CLM_DEF(43430A1, "brcmfmac43430-sdio");
618 BRCMF_FW_DEF(43430B0, "brcmfmac43430b0-sdio");
619 BRCMF_FW_CLM_DEF(43439, "brcmfmac43439-sdio");
620 BRCMF_FW_CLM_DEF(43455, "brcmfmac43455-sdio");
621 BRCMF_FW_DEF(43456, "brcmfmac43456-sdio");
622 BRCMF_FW_CLM_DEF(4354, "brcmfmac4354-sdio");
623 BRCMF_FW_CLM_DEF(4356, "brcmfmac4356-sdio");
624 BRCMF_FW_DEF(4359, "brcmfmac4359-sdio");
625 BRCMF_FW_CLM_DEF(4373, "brcmfmac4373-sdio");
626 BRCMF_FW_CLM_DEF(43012, "brcmfmac43012-sdio");
627 BRCMF_FW_CLM_DEF(43752, "brcmfmac43752-sdio");
628 
629 /* firmware config files */
630 MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH "brcmfmac*-sdio.*.txt");
631 
632 /* per-board firmware binaries */
633 MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH "brcmfmac*-sdio.*.bin");
634 
635 static const struct brcmf_firmware_mapping brcmf_sdio_fwnames[] = {
636 	BRCMF_FW_ENTRY(BRCM_CC_43143_CHIP_ID, 0xFFFFFFFF, 43143),
637 	BRCMF_FW_ENTRY(BRCM_CC_43241_CHIP_ID, 0x0000001F, 43241B0),
638 	BRCMF_FW_ENTRY(BRCM_CC_43241_CHIP_ID, 0x00000020, 43241B4),
639 	BRCMF_FW_ENTRY(BRCM_CC_43241_CHIP_ID, 0xFFFFFFC0, 43241B5),
640 	BRCMF_FW_ENTRY(BRCM_CC_4329_CHIP_ID, 0xFFFFFFFF, 4329),
641 	BRCMF_FW_ENTRY(BRCM_CC_4330_CHIP_ID, 0xFFFFFFFF, 4330),
642 	BRCMF_FW_ENTRY(BRCM_CC_4334_CHIP_ID, 0xFFFFFFFF, 4334),
643 	BRCMF_FW_ENTRY(BRCM_CC_43340_CHIP_ID, 0xFFFFFFFF, 43340),
644 	BRCMF_FW_ENTRY(BRCM_CC_43341_CHIP_ID, 0xFFFFFFFF, 43340),
645 	BRCMF_FW_ENTRY(BRCM_CC_4335_CHIP_ID, 0xFFFFFFFF, 4335),
646 	BRCMF_FW_ENTRY(BRCM_CC_43362_CHIP_ID, 0xFFFFFFFE, 43362),
647 	BRCMF_FW_ENTRY(BRCM_CC_4339_CHIP_ID, 0xFFFFFFFF, 4339),
648 	BRCMF_FW_ENTRY(BRCM_CC_43430_CHIP_ID, 0x00000001, 43430A0),
649 	BRCMF_FW_ENTRY(BRCM_CC_43430_CHIP_ID, 0x00000002, 43430A1),
650 	BRCMF_FW_ENTRY(BRCM_CC_43430_CHIP_ID, 0xFFFFFFFC, 43430B0),
651 	BRCMF_FW_ENTRY(BRCM_CC_4345_CHIP_ID, 0x00000200, 43456),
652 	BRCMF_FW_ENTRY(BRCM_CC_4345_CHIP_ID, 0xFFFFFDC0, 43455),
653 	BRCMF_FW_ENTRY(BRCM_CC_43454_CHIP_ID, 0x00000040, 43455),
654 	BRCMF_FW_ENTRY(BRCM_CC_4354_CHIP_ID, 0xFFFFFFFF, 4354),
655 	BRCMF_FW_ENTRY(BRCM_CC_4356_CHIP_ID, 0xFFFFFFFF, 4356),
656 	BRCMF_FW_ENTRY(BRCM_CC_4359_CHIP_ID, 0xFFFFFFFF, 4359),
657 	BRCMF_FW_ENTRY(CY_CC_4373_CHIP_ID, 0xFFFFFFFF, 4373),
658 	BRCMF_FW_ENTRY(CY_CC_43012_CHIP_ID, 0xFFFFFFFF, 43012),
659 	BRCMF_FW_ENTRY(CY_CC_43439_CHIP_ID, 0xFFFFFFFF, 43439),
660 	BRCMF_FW_ENTRY(CY_CC_43752_CHIP_ID, 0xFFFFFFFF, 43752)
661 };
662 
663 #define TXCTL_CREDITS	2
664 
665 static void pkt_align(struct sk_buff *p, int len, int align)
666 {
667 	uint datalign;
668 	datalign = (unsigned long)(p->data);
669 	datalign = roundup(datalign, (align)) - datalign;
670 	if (datalign)
671 		skb_pull(p, datalign);
672 	__skb_trim(p, len);
673 }
674 
675 /* To check if there's window offered */
676 static bool data_ok(struct brcmf_sdio *bus)
677 {
678 	u8 tx_rsv = 0;
679 
680 	/* Reserve TXCTL_CREDITS credits for txctl when it is ready to send */
681 	if (bus->ctrl_frame_stat)
682 		tx_rsv = TXCTL_CREDITS;
683 
684 	return (bus->tx_max - bus->tx_seq - tx_rsv) != 0 &&
685 	       ((bus->tx_max - bus->tx_seq - tx_rsv) & 0x80) == 0;
686 
687 }
688 
689 /* To check if there's window offered */
690 static bool txctl_ok(struct brcmf_sdio *bus)
691 {
692 	return (bus->tx_max - bus->tx_seq) != 0 &&
693 	       ((bus->tx_max - bus->tx_seq) & 0x80) == 0;
694 }
695 
696 static int
697 brcmf_sdio_kso_control(struct brcmf_sdio *bus, bool on)
698 {
699 	u8 wr_val = 0, rd_val, cmp_val, bmask;
700 	int err = 0;
701 	int err_cnt = 0;
702 	int try_cnt = 0;
703 
704 	brcmf_dbg(TRACE, "Enter: on=%d\n", on);
705 
706 	sdio_retune_crc_disable(bus->sdiodev->func1);
707 
708 	/* Cannot re-tune if device is asleep; defer till we're awake */
709 	if (on)
710 		sdio_retune_hold_now(bus->sdiodev->func1);
711 
712 	wr_val = (on << SBSDIO_FUNC1_SLEEPCSR_KSO_SHIFT);
713 	/* 1st KSO write goes to AOS wake up core if device is asleep  */
714 	brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR, wr_val, &err);
715 
716 	/* In case of 43012 chip, the chip could go down immediately after
717 	 * KSO bit is cleared. So the further reads of KSO register could
718 	 * fail. Thereby just bailing out immediately after clearing KSO
719 	 * bit, to avoid polling of KSO bit.
720 	 */
721 	if (!on && bus->ci->chip == CY_CC_43012_CHIP_ID)
722 		return err;
723 
724 	if (on) {
725 		/* device WAKEUP through KSO:
726 		 * write bit 0 & read back until
727 		 * both bits 0 (kso bit) & 1 (dev on status) are set
728 		 */
729 		cmp_val = SBSDIO_FUNC1_SLEEPCSR_KSO_MASK |
730 			  SBSDIO_FUNC1_SLEEPCSR_DEVON_MASK;
731 		bmask = cmp_val;
732 		usleep_range(2000, 3000);
733 	} else {
734 		/* Put device to sleep, turn off KSO */
735 		cmp_val = 0;
736 		/* only check for bit0, bit1(dev on status) may not
737 		 * get cleared right away
738 		 */
739 		bmask = SBSDIO_FUNC1_SLEEPCSR_KSO_MASK;
740 	}
741 
742 	do {
743 		/* reliable KSO bit set/clr:
744 		 * the sdiod sleep write access is synced to PMU 32khz clk
745 		 * just one write attempt may fail,
746 		 * read it back until it matches written value
747 		 */
748 		rd_val = brcmf_sdiod_readb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR,
749 					   &err);
750 		if (!err) {
751 			if ((rd_val & bmask) == cmp_val)
752 				break;
753 			err_cnt = 0;
754 		}
755 		/* bail out upon subsequent access errors */
756 		if (err && (err_cnt++ > BRCMF_SDIO_MAX_ACCESS_ERRORS))
757 			break;
758 
759 		udelay(KSO_WAIT_US);
760 		brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR, wr_val,
761 				   &err);
762 
763 	} while (try_cnt++ < MAX_KSO_ATTEMPTS);
764 
765 	if (try_cnt > 2)
766 		brcmf_dbg(SDIO, "try_cnt=%d rd_val=0x%x err=%d\n", try_cnt,
767 			  rd_val, err);
768 
769 	if (try_cnt > MAX_KSO_ATTEMPTS)
770 		brcmf_err("max tries: rd_val=0x%x err=%d\n", rd_val, err);
771 
772 	if (on)
773 		sdio_retune_release(bus->sdiodev->func1);
774 
775 	sdio_retune_crc_enable(bus->sdiodev->func1);
776 
777 	return err;
778 }
779 
780 #define HOSTINTMASK		(I_HMB_SW_MASK | I_CHIPACTIVE)
781 
782 /* Turn backplane clock on or off */
783 static int brcmf_sdio_htclk(struct brcmf_sdio *bus, bool on, bool pendok)
784 {
785 	int err;
786 	u8 clkctl, clkreq, devctl;
787 	unsigned long timeout;
788 
789 	brcmf_dbg(SDIO, "Enter\n");
790 
791 	clkctl = 0;
792 
793 	if (bus->sr_enabled) {
794 		bus->clkstate = (on ? CLK_AVAIL : CLK_SDONLY);
795 		return 0;
796 	}
797 
798 	if (on) {
799 		/* Request HT Avail */
800 		clkreq =
801 		    bus->alp_only ? SBSDIO_ALP_AVAIL_REQ : SBSDIO_HT_AVAIL_REQ;
802 
803 		brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
804 				   clkreq, &err);
805 		if (err) {
806 			brcmf_err("HT Avail request error: %d\n", err);
807 			return -EBADE;
808 		}
809 
810 		/* Check current status */
811 		clkctl = brcmf_sdiod_readb(bus->sdiodev,
812 					   SBSDIO_FUNC1_CHIPCLKCSR, &err);
813 		if (err) {
814 			brcmf_err("HT Avail read error: %d\n", err);
815 			return -EBADE;
816 		}
817 
818 		/* Go to pending and await interrupt if appropriate */
819 		if (!SBSDIO_CLKAV(clkctl, bus->alp_only) && pendok) {
820 			/* Allow only clock-available interrupt */
821 			devctl = brcmf_sdiod_readb(bus->sdiodev,
822 						   SBSDIO_DEVICE_CTL, &err);
823 			if (err) {
824 				brcmf_err("Devctl error setting CA: %d\n", err);
825 				return -EBADE;
826 			}
827 
828 			devctl |= SBSDIO_DEVCTL_CA_INT_ONLY;
829 			brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_DEVICE_CTL,
830 					   devctl, &err);
831 			brcmf_dbg(SDIO, "CLKCTL: set PENDING\n");
832 			bus->clkstate = CLK_PENDING;
833 
834 			return 0;
835 		} else if (bus->clkstate == CLK_PENDING) {
836 			/* Cancel CA-only interrupt filter */
837 			devctl = brcmf_sdiod_readb(bus->sdiodev,
838 						   SBSDIO_DEVICE_CTL, &err);
839 			devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
840 			brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_DEVICE_CTL,
841 					   devctl, &err);
842 		}
843 
844 		/* Otherwise, wait here (polling) for HT Avail */
845 		timeout = jiffies +
846 			  msecs_to_jiffies(PMU_MAX_TRANSITION_DLY/1000);
847 		while (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
848 			clkctl = brcmf_sdiod_readb(bus->sdiodev,
849 						   SBSDIO_FUNC1_CHIPCLKCSR,
850 						   &err);
851 			if (time_after(jiffies, timeout))
852 				break;
853 			else
854 				usleep_range(5000, 10000);
855 		}
856 		if (err) {
857 			brcmf_err("HT Avail request error: %d\n", err);
858 			return -EBADE;
859 		}
860 		if (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
861 			brcmf_err("HT Avail timeout (%d): clkctl 0x%02x\n",
862 				  PMU_MAX_TRANSITION_DLY, clkctl);
863 			return -EBADE;
864 		}
865 
866 		/* Mark clock available */
867 		bus->clkstate = CLK_AVAIL;
868 		brcmf_dbg(SDIO, "CLKCTL: turned ON\n");
869 
870 #if defined(DEBUG)
871 		if (!bus->alp_only) {
872 			if (SBSDIO_ALPONLY(clkctl))
873 				brcmf_err("HT Clock should be on\n");
874 		}
875 #endif				/* defined (DEBUG) */
876 
877 	} else {
878 		clkreq = 0;
879 
880 		if (bus->clkstate == CLK_PENDING) {
881 			/* Cancel CA-only interrupt filter */
882 			devctl = brcmf_sdiod_readb(bus->sdiodev,
883 						   SBSDIO_DEVICE_CTL, &err);
884 			devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
885 			brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_DEVICE_CTL,
886 					   devctl, &err);
887 		}
888 
889 		bus->clkstate = CLK_SDONLY;
890 		brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
891 				   clkreq, &err);
892 		brcmf_dbg(SDIO, "CLKCTL: turned OFF\n");
893 		if (err) {
894 			brcmf_err("Failed access turning clock off: %d\n",
895 				  err);
896 			return -EBADE;
897 		}
898 	}
899 	return 0;
900 }
901 
902 /* Change idle/active SD state */
903 static int brcmf_sdio_sdclk(struct brcmf_sdio *bus, bool on)
904 {
905 	brcmf_dbg(SDIO, "Enter\n");
906 
907 	if (on)
908 		bus->clkstate = CLK_SDONLY;
909 	else
910 		bus->clkstate = CLK_NONE;
911 
912 	return 0;
913 }
914 
915 /* Transition SD and backplane clock readiness */
916 static int brcmf_sdio_clkctl(struct brcmf_sdio *bus, uint target, bool pendok)
917 {
918 #ifdef DEBUG
919 	uint oldstate = bus->clkstate;
920 #endif				/* DEBUG */
921 
922 	brcmf_dbg(SDIO, "Enter\n");
923 
924 	/* Early exit if we're already there */
925 	if (bus->clkstate == target)
926 		return 0;
927 
928 	switch (target) {
929 	case CLK_AVAIL:
930 		/* Make sure SD clock is available */
931 		if (bus->clkstate == CLK_NONE)
932 			brcmf_sdio_sdclk(bus, true);
933 		/* Now request HT Avail on the backplane */
934 		brcmf_sdio_htclk(bus, true, pendok);
935 		break;
936 
937 	case CLK_SDONLY:
938 		/* Remove HT request, or bring up SD clock */
939 		if (bus->clkstate == CLK_NONE)
940 			brcmf_sdio_sdclk(bus, true);
941 		else if (bus->clkstate == CLK_AVAIL)
942 			brcmf_sdio_htclk(bus, false, false);
943 		else
944 			brcmf_err("request for %d -> %d\n",
945 				  bus->clkstate, target);
946 		break;
947 
948 	case CLK_NONE:
949 		/* Make sure to remove HT request */
950 		if (bus->clkstate == CLK_AVAIL)
951 			brcmf_sdio_htclk(bus, false, false);
952 		/* Now remove the SD clock */
953 		brcmf_sdio_sdclk(bus, false);
954 		break;
955 	}
956 #ifdef DEBUG
957 	brcmf_dbg(SDIO, "%d -> %d\n", oldstate, bus->clkstate);
958 #endif				/* DEBUG */
959 
960 	return 0;
961 }
962 
963 static int
964 brcmf_sdio_bus_sleep(struct brcmf_sdio *bus, bool sleep, bool pendok)
965 {
966 	int err = 0;
967 	u8 clkcsr;
968 
969 	brcmf_dbg(SDIO, "Enter: request %s currently %s\n",
970 		  (sleep ? "SLEEP" : "WAKE"),
971 		  (bus->sleeping ? "SLEEP" : "WAKE"));
972 
973 	/* If SR is enabled control bus state with KSO */
974 	if (bus->sr_enabled) {
975 		/* Done if we're already in the requested state */
976 		if (sleep == bus->sleeping)
977 			goto end;
978 
979 		/* Going to sleep */
980 		if (sleep) {
981 			clkcsr = brcmf_sdiod_readb(bus->sdiodev,
982 						   SBSDIO_FUNC1_CHIPCLKCSR,
983 						   &err);
984 			if ((clkcsr & SBSDIO_CSR_MASK) == 0) {
985 				brcmf_dbg(SDIO, "no clock, set ALP\n");
986 				brcmf_sdiod_writeb(bus->sdiodev,
987 						   SBSDIO_FUNC1_CHIPCLKCSR,
988 						   SBSDIO_ALP_AVAIL_REQ, &err);
989 			}
990 			err = brcmf_sdio_kso_control(bus, false);
991 		} else {
992 			err = brcmf_sdio_kso_control(bus, true);
993 		}
994 		if (err) {
995 			brcmf_err("error while changing bus sleep state %d\n",
996 				  err);
997 			goto done;
998 		}
999 	}
1000 
1001 end:
1002 	/* control clocks */
1003 	if (sleep) {
1004 		if (!bus->sr_enabled)
1005 			brcmf_sdio_clkctl(bus, CLK_NONE, pendok);
1006 	} else {
1007 		brcmf_sdio_clkctl(bus, CLK_AVAIL, pendok);
1008 		brcmf_sdio_wd_timer(bus, true);
1009 	}
1010 	bus->sleeping = sleep;
1011 	brcmf_dbg(SDIO, "new state %s\n",
1012 		  (sleep ? "SLEEP" : "WAKE"));
1013 done:
1014 	brcmf_dbg(SDIO, "Exit: err=%d\n", err);
1015 	return err;
1016 
1017 }
1018 
1019 #ifdef DEBUG
1020 static inline bool brcmf_sdio_valid_shared_address(u32 addr)
1021 {
1022 	return !(addr == 0 || ((~addr >> 16) & 0xffff) == (addr & 0xffff));
1023 }
1024 
1025 static int brcmf_sdio_readshared(struct brcmf_sdio *bus,
1026 				 struct sdpcm_shared *sh)
1027 {
1028 	u32 addr = 0;
1029 	int rv;
1030 	u32 shaddr = 0;
1031 	struct sdpcm_shared_le sh_le;
1032 	__le32 addr_le;
1033 
1034 	sdio_claim_host(bus->sdiodev->func1);
1035 	brcmf_sdio_bus_sleep(bus, false, false);
1036 
1037 	/*
1038 	 * Read last word in socram to determine
1039 	 * address of sdpcm_shared structure
1040 	 */
1041 	shaddr = bus->ci->rambase + bus->ci->ramsize - 4;
1042 	if (!bus->ci->rambase && brcmf_chip_sr_capable(bus->ci))
1043 		shaddr -= bus->ci->srsize;
1044 	rv = brcmf_sdiod_ramrw(bus->sdiodev, false, shaddr,
1045 			       (u8 *)&addr_le, 4);
1046 	if (rv < 0)
1047 		goto fail;
1048 
1049 	/*
1050 	 * Check if addr is valid.
1051 	 * NVRAM length at the end of memory should have been overwritten.
1052 	 */
1053 	addr = le32_to_cpu(addr_le);
1054 	if (!brcmf_sdio_valid_shared_address(addr)) {
1055 		brcmf_err("invalid sdpcm_shared address 0x%08X\n", addr);
1056 		rv = -EINVAL;
1057 		goto fail;
1058 	}
1059 
1060 	brcmf_dbg(INFO, "sdpcm_shared address 0x%08X\n", addr);
1061 
1062 	/* Read hndrte_shared structure */
1063 	rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr, (u8 *)&sh_le,
1064 			       sizeof(struct sdpcm_shared_le));
1065 	if (rv < 0)
1066 		goto fail;
1067 
1068 	sdio_release_host(bus->sdiodev->func1);
1069 
1070 	/* Endianness */
1071 	sh->flags = le32_to_cpu(sh_le.flags);
1072 	sh->trap_addr = le32_to_cpu(sh_le.trap_addr);
1073 	sh->assert_exp_addr = le32_to_cpu(sh_le.assert_exp_addr);
1074 	sh->assert_file_addr = le32_to_cpu(sh_le.assert_file_addr);
1075 	sh->assert_line = le32_to_cpu(sh_le.assert_line);
1076 	sh->console_addr = le32_to_cpu(sh_le.console_addr);
1077 	sh->msgtrace_addr = le32_to_cpu(sh_le.msgtrace_addr);
1078 
1079 	if ((sh->flags & SDPCM_SHARED_VERSION_MASK) > SDPCM_SHARED_VERSION) {
1080 		brcmf_err("sdpcm shared version unsupported: dhd %d dongle %d\n",
1081 			  SDPCM_SHARED_VERSION,
1082 			  sh->flags & SDPCM_SHARED_VERSION_MASK);
1083 		return -EPROTO;
1084 	}
1085 	return 0;
1086 
1087 fail:
1088 	brcmf_err("unable to obtain sdpcm_shared info: rv=%d (addr=0x%x)\n",
1089 		  rv, addr);
1090 	sdio_release_host(bus->sdiodev->func1);
1091 	return rv;
1092 }
1093 
1094 static void brcmf_sdio_get_console_addr(struct brcmf_sdio *bus)
1095 {
1096 	struct sdpcm_shared sh;
1097 
1098 	if (brcmf_sdio_readshared(bus, &sh) == 0)
1099 		bus->console_addr = sh.console_addr;
1100 }
1101 #else
1102 static void brcmf_sdio_get_console_addr(struct brcmf_sdio *bus)
1103 {
1104 }
1105 #endif /* DEBUG */
1106 
1107 static u32 brcmf_sdio_hostmail(struct brcmf_sdio *bus)
1108 {
1109 	struct brcmf_sdio_dev *sdiod = bus->sdiodev;
1110 	struct brcmf_core *core = bus->sdio_core;
1111 	u32 intstatus = 0;
1112 	u32 hmb_data;
1113 	u8 fcbits;
1114 	int ret;
1115 
1116 	brcmf_dbg(SDIO, "Enter\n");
1117 
1118 	/* Read mailbox data and ack that we did so */
1119 	hmb_data = brcmf_sdiod_readl(sdiod,
1120 				     core->base + SD_REG(tohostmailboxdata),
1121 				     &ret);
1122 
1123 	if (!ret)
1124 		brcmf_sdiod_writel(sdiod, core->base + SD_REG(tosbmailbox),
1125 				   SMB_INT_ACK, &ret);
1126 
1127 	bus->sdcnt.f1regdata += 2;
1128 
1129 	/* dongle indicates the firmware has halted/crashed */
1130 	if (hmb_data & HMB_DATA_FWHALT) {
1131 		brcmf_dbg(SDIO, "mailbox indicates firmware halted\n");
1132 		brcmf_fw_crashed(&sdiod->func1->dev);
1133 	}
1134 
1135 	/* Dongle recomposed rx frames, accept them again */
1136 	if (hmb_data & HMB_DATA_NAKHANDLED) {
1137 		brcmf_dbg(SDIO, "Dongle reports NAK handled, expect rtx of %d\n",
1138 			  bus->rx_seq);
1139 		if (!bus->rxskip)
1140 			brcmf_err("unexpected NAKHANDLED!\n");
1141 
1142 		bus->rxskip = false;
1143 		intstatus |= I_HMB_FRAME_IND;
1144 	}
1145 
1146 	/*
1147 	 * DEVREADY does not occur with gSPI.
1148 	 */
1149 	if (hmb_data & (HMB_DATA_DEVREADY | HMB_DATA_FWREADY)) {
1150 		bus->sdpcm_ver =
1151 		    (hmb_data & HMB_DATA_VERSION_MASK) >>
1152 		    HMB_DATA_VERSION_SHIFT;
1153 		if (bus->sdpcm_ver != SDPCM_PROT_VERSION)
1154 			brcmf_err("Version mismatch, dongle reports %d, "
1155 				  "expecting %d\n",
1156 				  bus->sdpcm_ver, SDPCM_PROT_VERSION);
1157 		else
1158 			brcmf_dbg(SDIO, "Dongle ready, protocol version %d\n",
1159 				  bus->sdpcm_ver);
1160 
1161 		/*
1162 		 * Retrieve console state address now that firmware should have
1163 		 * updated it.
1164 		 */
1165 		brcmf_sdio_get_console_addr(bus);
1166 	}
1167 
1168 	/*
1169 	 * Flow Control has been moved into the RX headers and this out of band
1170 	 * method isn't used any more.
1171 	 * remaining backward compatible with older dongles.
1172 	 */
1173 	if (hmb_data & HMB_DATA_FC) {
1174 		fcbits = (hmb_data & HMB_DATA_FCDATA_MASK) >>
1175 							HMB_DATA_FCDATA_SHIFT;
1176 
1177 		if (fcbits & ~bus->flowcontrol)
1178 			bus->sdcnt.fc_xoff++;
1179 
1180 		if (bus->flowcontrol & ~fcbits)
1181 			bus->sdcnt.fc_xon++;
1182 
1183 		bus->sdcnt.fc_rcvd++;
1184 		bus->flowcontrol = fcbits;
1185 	}
1186 
1187 	/* Shouldn't be any others */
1188 	if (hmb_data & ~(HMB_DATA_DEVREADY |
1189 			 HMB_DATA_NAKHANDLED |
1190 			 HMB_DATA_FC |
1191 			 HMB_DATA_FWREADY |
1192 			 HMB_DATA_FWHALT |
1193 			 HMB_DATA_FCDATA_MASK | HMB_DATA_VERSION_MASK))
1194 		brcmf_err("Unknown mailbox data content: 0x%02x\n",
1195 			  hmb_data);
1196 
1197 	return intstatus;
1198 }
1199 
1200 static void brcmf_sdio_rxfail(struct brcmf_sdio *bus, bool abort, bool rtx)
1201 {
1202 	struct brcmf_sdio_dev *sdiod = bus->sdiodev;
1203 	struct brcmf_core *core = bus->sdio_core;
1204 	uint retries = 0;
1205 	u16 lastrbc;
1206 	u8 hi, lo;
1207 	int err;
1208 
1209 	brcmf_err("%sterminate frame%s\n",
1210 		  abort ? "abort command, " : "",
1211 		  rtx ? ", send NAK" : "");
1212 
1213 	if (abort)
1214 		brcmf_sdiod_abort(bus->sdiodev, bus->sdiodev->func2);
1215 
1216 	brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_FUNC1_FRAMECTRL, SFC_RF_TERM,
1217 			   &err);
1218 	bus->sdcnt.f1regdata++;
1219 
1220 	/* Wait until the packet has been flushed (device/FIFO stable) */
1221 	for (lastrbc = retries = 0xffff; retries > 0; retries--) {
1222 		hi = brcmf_sdiod_readb(bus->sdiodev, SBSDIO_FUNC1_RFRAMEBCHI,
1223 				       &err);
1224 		lo = brcmf_sdiod_readb(bus->sdiodev, SBSDIO_FUNC1_RFRAMEBCLO,
1225 				       &err);
1226 		bus->sdcnt.f1regdata += 2;
1227 
1228 		if ((hi == 0) && (lo == 0))
1229 			break;
1230 
1231 		if ((hi > (lastrbc >> 8)) && (lo > (lastrbc & 0x00ff))) {
1232 			brcmf_err("count growing: last 0x%04x now 0x%04x\n",
1233 				  lastrbc, (hi << 8) + lo);
1234 		}
1235 		lastrbc = (hi << 8) + lo;
1236 	}
1237 
1238 	if (!retries)
1239 		brcmf_err("count never zeroed: last 0x%04x\n", lastrbc);
1240 	else
1241 		brcmf_dbg(SDIO, "flush took %d iterations\n", 0xffff - retries);
1242 
1243 	if (rtx) {
1244 		bus->sdcnt.rxrtx++;
1245 		brcmf_sdiod_writel(sdiod, core->base + SD_REG(tosbmailbox),
1246 				   SMB_NAK, &err);
1247 
1248 		bus->sdcnt.f1regdata++;
1249 		if (err == 0)
1250 			bus->rxskip = true;
1251 	}
1252 
1253 	/* Clear partial in any case */
1254 	bus->cur_read.len = 0;
1255 }
1256 
1257 static void brcmf_sdio_txfail(struct brcmf_sdio *bus)
1258 {
1259 	struct brcmf_sdio_dev *sdiodev = bus->sdiodev;
1260 	u8 i, hi, lo;
1261 
1262 	/* On failure, abort the command and terminate the frame */
1263 	brcmf_err("sdio error, abort command and terminate frame\n");
1264 	bus->sdcnt.tx_sderrs++;
1265 
1266 	brcmf_sdiod_abort(sdiodev, sdiodev->func2);
1267 	brcmf_sdiod_writeb(sdiodev, SBSDIO_FUNC1_FRAMECTRL, SFC_WF_TERM, NULL);
1268 	bus->sdcnt.f1regdata++;
1269 
1270 	for (i = 0; i < 3; i++) {
1271 		hi = brcmf_sdiod_readb(sdiodev, SBSDIO_FUNC1_WFRAMEBCHI, NULL);
1272 		lo = brcmf_sdiod_readb(sdiodev, SBSDIO_FUNC1_WFRAMEBCLO, NULL);
1273 		bus->sdcnt.f1regdata += 2;
1274 		if ((hi == 0) && (lo == 0))
1275 			break;
1276 	}
1277 }
1278 
1279 /* return total length of buffer chain */
1280 static uint brcmf_sdio_glom_len(struct brcmf_sdio *bus)
1281 {
1282 	struct sk_buff *p;
1283 	uint total;
1284 
1285 	total = 0;
1286 	skb_queue_walk(&bus->glom, p)
1287 		total += p->len;
1288 	return total;
1289 }
1290 
1291 static void brcmf_sdio_free_glom(struct brcmf_sdio *bus)
1292 {
1293 	struct sk_buff *cur, *next;
1294 
1295 	skb_queue_walk_safe(&bus->glom, cur, next) {
1296 		skb_unlink(cur, &bus->glom);
1297 		brcmu_pkt_buf_free_skb(cur);
1298 	}
1299 }
1300 
1301 /*
1302  * brcmfmac sdio bus specific header
1303  * This is the lowest layer header wrapped on the packets transmitted between
1304  * host and WiFi dongle which contains information needed for SDIO core and
1305  * firmware
1306  *
1307  * It consists of 3 parts: hardware header, hardware extension header and
1308  * software header
1309  * hardware header (frame tag) - 4 bytes
1310  * Byte 0~1: Frame length
1311  * Byte 2~3: Checksum, bit-wise inverse of frame length
1312  * hardware extension header - 8 bytes
1313  * Tx glom mode only, N/A for Rx or normal Tx
1314  * Byte 0~1: Packet length excluding hw frame tag
1315  * Byte 2: Reserved
1316  * Byte 3: Frame flags, bit 0: last frame indication
1317  * Byte 4~5: Reserved
1318  * Byte 6~7: Tail padding length
1319  * software header - 8 bytes
1320  * Byte 0: Rx/Tx sequence number
1321  * Byte 1: 4 MSB Channel number, 4 LSB arbitrary flag
1322  * Byte 2: Length of next data frame, reserved for Tx
1323  * Byte 3: Data offset
1324  * Byte 4: Flow control bits, reserved for Tx
1325  * Byte 5: Maximum Sequence number allowed by firmware for Tx, N/A for Tx packet
1326  * Byte 6~7: Reserved
1327  */
1328 #define SDPCM_HWHDR_LEN			4
1329 #define SDPCM_HWEXT_LEN			8
1330 #define SDPCM_SWHDR_LEN			8
1331 #define SDPCM_HDRLEN			(SDPCM_HWHDR_LEN + SDPCM_SWHDR_LEN)
1332 /* software header */
1333 #define SDPCM_SEQ_MASK			0x000000ff
1334 #define SDPCM_SEQ_WRAP			256
1335 #define SDPCM_CHANNEL_MASK		0x00000f00
1336 #define SDPCM_CHANNEL_SHIFT		8
1337 #define SDPCM_CONTROL_CHANNEL		0	/* Control */
1338 #define SDPCM_EVENT_CHANNEL		1	/* Asyc Event Indication */
1339 #define SDPCM_DATA_CHANNEL		2	/* Data Xmit/Recv */
1340 #define SDPCM_GLOM_CHANNEL		3	/* Coalesced packets */
1341 #define SDPCM_TEST_CHANNEL		15	/* Test/debug packets */
1342 #define SDPCM_GLOMDESC(p)		(((u8 *)p)[1] & 0x80)
1343 #define SDPCM_NEXTLEN_MASK		0x00ff0000
1344 #define SDPCM_NEXTLEN_SHIFT		16
1345 #define SDPCM_DOFFSET_MASK		0xff000000
1346 #define SDPCM_DOFFSET_SHIFT		24
1347 #define SDPCM_FCMASK_MASK		0x000000ff
1348 #define SDPCM_WINDOW_MASK		0x0000ff00
1349 #define SDPCM_WINDOW_SHIFT		8
1350 
1351 static inline u8 brcmf_sdio_getdatoffset(u8 *swheader)
1352 {
1353 	u32 hdrvalue;
1354 	hdrvalue = le32_to_cpu(*(__le32 *)swheader);
1355 	return (u8)((hdrvalue & SDPCM_DOFFSET_MASK) >> SDPCM_DOFFSET_SHIFT);
1356 }
1357 
1358 static inline bool brcmf_sdio_fromevntchan(u8 *swheader)
1359 {
1360 	u32 hdrvalue;
1361 	u8 ret;
1362 
1363 	hdrvalue = le32_to_cpu(*(__le32 *)swheader);
1364 	ret = (u8)((hdrvalue & SDPCM_CHANNEL_MASK) >> SDPCM_CHANNEL_SHIFT);
1365 
1366 	return (ret == SDPCM_EVENT_CHANNEL);
1367 }
1368 
1369 static int brcmf_sdio_hdparse(struct brcmf_sdio *bus, u8 *header,
1370 			      struct brcmf_sdio_hdrinfo *rd,
1371 			      enum brcmf_sdio_frmtype type)
1372 {
1373 	u16 len, checksum;
1374 	u8 rx_seq, fc, tx_seq_max;
1375 	u32 swheader;
1376 
1377 	trace_brcmf_sdpcm_hdr(SDPCM_RX, header);
1378 
1379 	/* hw header */
1380 	len = get_unaligned_le16(header);
1381 	checksum = get_unaligned_le16(header + sizeof(u16));
1382 	/* All zero means no more to read */
1383 	if (!(len | checksum)) {
1384 		bus->rxpending = false;
1385 		return -ENODATA;
1386 	}
1387 	if ((u16)(~(len ^ checksum))) {
1388 		brcmf_err("HW header checksum error\n");
1389 		bus->sdcnt.rx_badhdr++;
1390 		brcmf_sdio_rxfail(bus, false, false);
1391 		return -EIO;
1392 	}
1393 	if (len < SDPCM_HDRLEN) {
1394 		brcmf_err("HW header length error\n");
1395 		return -EPROTO;
1396 	}
1397 	if (type == BRCMF_SDIO_FT_SUPER &&
1398 	    (roundup(len, bus->blocksize) != rd->len)) {
1399 		brcmf_err("HW superframe header length error\n");
1400 		return -EPROTO;
1401 	}
1402 	if (type == BRCMF_SDIO_FT_SUB && len > rd->len) {
1403 		brcmf_err("HW subframe header length error\n");
1404 		return -EPROTO;
1405 	}
1406 	rd->len = len;
1407 
1408 	/* software header */
1409 	header += SDPCM_HWHDR_LEN;
1410 	swheader = le32_to_cpu(*(__le32 *)header);
1411 	if (type == BRCMF_SDIO_FT_SUPER && SDPCM_GLOMDESC(header)) {
1412 		brcmf_err("Glom descriptor found in superframe head\n");
1413 		rd->len = 0;
1414 		return -EINVAL;
1415 	}
1416 	rx_seq = (u8)(swheader & SDPCM_SEQ_MASK);
1417 	rd->channel = (swheader & SDPCM_CHANNEL_MASK) >> SDPCM_CHANNEL_SHIFT;
1418 	if (len > MAX_RX_DATASZ && rd->channel != SDPCM_CONTROL_CHANNEL &&
1419 	    type != BRCMF_SDIO_FT_SUPER) {
1420 		brcmf_err("HW header length too long\n");
1421 		bus->sdcnt.rx_toolong++;
1422 		brcmf_sdio_rxfail(bus, false, false);
1423 		rd->len = 0;
1424 		return -EPROTO;
1425 	}
1426 	if (type == BRCMF_SDIO_FT_SUPER && rd->channel != SDPCM_GLOM_CHANNEL) {
1427 		brcmf_err("Wrong channel for superframe\n");
1428 		rd->len = 0;
1429 		return -EINVAL;
1430 	}
1431 	if (type == BRCMF_SDIO_FT_SUB && rd->channel != SDPCM_DATA_CHANNEL &&
1432 	    rd->channel != SDPCM_EVENT_CHANNEL) {
1433 		brcmf_err("Wrong channel for subframe\n");
1434 		rd->len = 0;
1435 		return -EINVAL;
1436 	}
1437 	rd->dat_offset = brcmf_sdio_getdatoffset(header);
1438 	if (rd->dat_offset < SDPCM_HDRLEN || rd->dat_offset > rd->len) {
1439 		brcmf_err("seq %d: bad data offset\n", rx_seq);
1440 		bus->sdcnt.rx_badhdr++;
1441 		brcmf_sdio_rxfail(bus, false, false);
1442 		rd->len = 0;
1443 		return -ENXIO;
1444 	}
1445 	if (rd->seq_num != rx_seq) {
1446 		brcmf_dbg(SDIO, "seq %d, expected %d\n", rx_seq, rd->seq_num);
1447 		bus->sdcnt.rx_badseq++;
1448 		rd->seq_num = rx_seq;
1449 	}
1450 	/* no need to check the reset for subframe */
1451 	if (type == BRCMF_SDIO_FT_SUB)
1452 		return 0;
1453 	rd->len_nxtfrm = (swheader & SDPCM_NEXTLEN_MASK) >> SDPCM_NEXTLEN_SHIFT;
1454 	if (rd->len_nxtfrm << 4 > MAX_RX_DATASZ) {
1455 		/* only warm for NON glom packet */
1456 		if (rd->channel != SDPCM_GLOM_CHANNEL)
1457 			brcmf_err("seq %d: next length error\n", rx_seq);
1458 		rd->len_nxtfrm = 0;
1459 	}
1460 	swheader = le32_to_cpu(*(__le32 *)(header + 4));
1461 	fc = swheader & SDPCM_FCMASK_MASK;
1462 	if (bus->flowcontrol != fc) {
1463 		if (~bus->flowcontrol & fc)
1464 			bus->sdcnt.fc_xoff++;
1465 		if (bus->flowcontrol & ~fc)
1466 			bus->sdcnt.fc_xon++;
1467 		bus->sdcnt.fc_rcvd++;
1468 		bus->flowcontrol = fc;
1469 	}
1470 	tx_seq_max = (swheader & SDPCM_WINDOW_MASK) >> SDPCM_WINDOW_SHIFT;
1471 	if ((u8)(tx_seq_max - bus->tx_seq) > 0x40) {
1472 		brcmf_err("seq %d: max tx seq number error\n", rx_seq);
1473 		tx_seq_max = bus->tx_seq + 2;
1474 	}
1475 	bus->tx_max = tx_seq_max;
1476 
1477 	return 0;
1478 }
1479 
1480 static inline void brcmf_sdio_update_hwhdr(u8 *header, u16 frm_length)
1481 {
1482 	*(__le16 *)header = cpu_to_le16(frm_length);
1483 	*(((__le16 *)header) + 1) = cpu_to_le16(~frm_length);
1484 }
1485 
1486 static void brcmf_sdio_hdpack(struct brcmf_sdio *bus, u8 *header,
1487 			      struct brcmf_sdio_hdrinfo *hd_info)
1488 {
1489 	u32 hdrval;
1490 	u8 hdr_offset;
1491 
1492 	brcmf_sdio_update_hwhdr(header, hd_info->len);
1493 	hdr_offset = SDPCM_HWHDR_LEN;
1494 
1495 	if (bus->txglom) {
1496 		hdrval = (hd_info->len - hdr_offset) | (hd_info->lastfrm << 24);
1497 		*((__le32 *)(header + hdr_offset)) = cpu_to_le32(hdrval);
1498 		hdrval = (u16)hd_info->tail_pad << 16;
1499 		*(((__le32 *)(header + hdr_offset)) + 1) = cpu_to_le32(hdrval);
1500 		hdr_offset += SDPCM_HWEXT_LEN;
1501 	}
1502 
1503 	hdrval = hd_info->seq_num;
1504 	hdrval |= (hd_info->channel << SDPCM_CHANNEL_SHIFT) &
1505 		  SDPCM_CHANNEL_MASK;
1506 	hdrval |= (hd_info->dat_offset << SDPCM_DOFFSET_SHIFT) &
1507 		  SDPCM_DOFFSET_MASK;
1508 	*((__le32 *)(header + hdr_offset)) = cpu_to_le32(hdrval);
1509 	*(((__le32 *)(header + hdr_offset)) + 1) = 0;
1510 	trace_brcmf_sdpcm_hdr(SDPCM_TX + !!(bus->txglom), header);
1511 }
1512 
1513 static u8 brcmf_sdio_rxglom(struct brcmf_sdio *bus, u8 rxseq)
1514 {
1515 	u16 dlen, totlen;
1516 	u8 *dptr, num = 0;
1517 	u16 sublen;
1518 	struct sk_buff *pfirst, *pnext;
1519 
1520 	int errcode;
1521 	u8 doff;
1522 
1523 	struct brcmf_sdio_hdrinfo rd_new;
1524 
1525 	/* If packets, issue read(s) and send up packet chain */
1526 	/* Return sequence numbers consumed? */
1527 
1528 	brcmf_dbg(SDIO, "start: glomd %p glom %p\n",
1529 		  bus->glomd, skb_peek(&bus->glom));
1530 
1531 	/* If there's a descriptor, generate the packet chain */
1532 	if (bus->glomd) {
1533 		pfirst = pnext = NULL;
1534 		dlen = (u16) (bus->glomd->len);
1535 		dptr = bus->glomd->data;
1536 		if (!dlen || (dlen & 1)) {
1537 			brcmf_err("bad glomd len(%d), ignore descriptor\n",
1538 				  dlen);
1539 			dlen = 0;
1540 		}
1541 
1542 		for (totlen = num = 0; dlen; num++) {
1543 			/* Get (and move past) next length */
1544 			sublen = get_unaligned_le16(dptr);
1545 			dlen -= sizeof(u16);
1546 			dptr += sizeof(u16);
1547 			if ((sublen < SDPCM_HDRLEN) ||
1548 			    ((num == 0) && (sublen < (2 * SDPCM_HDRLEN)))) {
1549 				brcmf_err("descriptor len %d bad: %d\n",
1550 					  num, sublen);
1551 				pnext = NULL;
1552 				break;
1553 			}
1554 			if (sublen % bus->sgentry_align) {
1555 				brcmf_err("sublen %d not multiple of %d\n",
1556 					  sublen, bus->sgentry_align);
1557 			}
1558 			totlen += sublen;
1559 
1560 			/* For last frame, adjust read len so total
1561 				 is a block multiple */
1562 			if (!dlen) {
1563 				sublen +=
1564 				    (roundup(totlen, bus->blocksize) - totlen);
1565 				totlen = roundup(totlen, bus->blocksize);
1566 			}
1567 
1568 			/* Allocate/chain packet for next subframe */
1569 			pnext = brcmu_pkt_buf_get_skb(sublen + bus->sgentry_align);
1570 			if (pnext == NULL) {
1571 				brcmf_err("bcm_pkt_buf_get_skb failed, num %d len %d\n",
1572 					  num, sublen);
1573 				break;
1574 			}
1575 			skb_queue_tail(&bus->glom, pnext);
1576 
1577 			/* Adhere to start alignment requirements */
1578 			pkt_align(pnext, sublen, bus->sgentry_align);
1579 		}
1580 
1581 		/* If all allocations succeeded, save packet chain
1582 			 in bus structure */
1583 		if (pnext) {
1584 			brcmf_dbg(GLOM, "allocated %d-byte packet chain for %d subframes\n",
1585 				  totlen, num);
1586 			if (BRCMF_GLOM_ON() && bus->cur_read.len &&
1587 			    totlen != bus->cur_read.len) {
1588 				brcmf_dbg(GLOM, "glomdesc mismatch: nextlen %d glomdesc %d rxseq %d\n",
1589 					  bus->cur_read.len, totlen, rxseq);
1590 			}
1591 			pfirst = pnext = NULL;
1592 		} else {
1593 			brcmf_sdio_free_glom(bus);
1594 			num = 0;
1595 		}
1596 
1597 		/* Done with descriptor packet */
1598 		brcmu_pkt_buf_free_skb(bus->glomd);
1599 		bus->glomd = NULL;
1600 		bus->cur_read.len = 0;
1601 	}
1602 
1603 	/* Ok -- either we just generated a packet chain,
1604 		 or had one from before */
1605 	if (!skb_queue_empty(&bus->glom)) {
1606 		if (BRCMF_GLOM_ON()) {
1607 			brcmf_dbg(GLOM, "try superframe read, packet chain:\n");
1608 			skb_queue_walk(&bus->glom, pnext) {
1609 				brcmf_dbg(GLOM, "    %p: %p len 0x%04x (%d)\n",
1610 					  pnext, (u8 *) (pnext->data),
1611 					  pnext->len, pnext->len);
1612 			}
1613 		}
1614 
1615 		pfirst = skb_peek(&bus->glom);
1616 		dlen = (u16) brcmf_sdio_glom_len(bus);
1617 
1618 		/* Do an SDIO read for the superframe.  Configurable iovar to
1619 		 * read directly into the chained packet, or allocate a large
1620 		 * packet and copy into the chain.
1621 		 */
1622 		sdio_claim_host(bus->sdiodev->func1);
1623 		errcode = brcmf_sdiod_recv_chain(bus->sdiodev,
1624 						 &bus->glom, dlen);
1625 		sdio_release_host(bus->sdiodev->func1);
1626 		bus->sdcnt.f2rxdata++;
1627 
1628 		/* On failure, kill the superframe */
1629 		if (errcode < 0) {
1630 			brcmf_err("glom read of %d bytes failed: %d\n",
1631 				  dlen, errcode);
1632 
1633 			sdio_claim_host(bus->sdiodev->func1);
1634 			brcmf_sdio_rxfail(bus, true, false);
1635 			bus->sdcnt.rxglomfail++;
1636 			brcmf_sdio_free_glom(bus);
1637 			sdio_release_host(bus->sdiodev->func1);
1638 			return 0;
1639 		}
1640 
1641 		brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
1642 				   pfirst->data, min_t(int, pfirst->len, 48),
1643 				   "SUPERFRAME:\n");
1644 
1645 		rd_new.seq_num = rxseq;
1646 		rd_new.len = dlen;
1647 		sdio_claim_host(bus->sdiodev->func1);
1648 		errcode = brcmf_sdio_hdparse(bus, pfirst->data, &rd_new,
1649 					     BRCMF_SDIO_FT_SUPER);
1650 		sdio_release_host(bus->sdiodev->func1);
1651 		bus->cur_read.len = rd_new.len_nxtfrm << 4;
1652 
1653 		/* Remove superframe header, remember offset */
1654 		skb_pull(pfirst, rd_new.dat_offset);
1655 		num = 0;
1656 
1657 		/* Validate all the subframe headers */
1658 		skb_queue_walk(&bus->glom, pnext) {
1659 			/* leave when invalid subframe is found */
1660 			if (errcode)
1661 				break;
1662 
1663 			rd_new.len = pnext->len;
1664 			rd_new.seq_num = rxseq++;
1665 			sdio_claim_host(bus->sdiodev->func1);
1666 			errcode = brcmf_sdio_hdparse(bus, pnext->data, &rd_new,
1667 						     BRCMF_SDIO_FT_SUB);
1668 			sdio_release_host(bus->sdiodev->func1);
1669 			brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
1670 					   pnext->data, 32, "subframe:\n");
1671 
1672 			num++;
1673 		}
1674 
1675 		if (errcode) {
1676 			/* Terminate frame on error */
1677 			sdio_claim_host(bus->sdiodev->func1);
1678 			brcmf_sdio_rxfail(bus, true, false);
1679 			bus->sdcnt.rxglomfail++;
1680 			brcmf_sdio_free_glom(bus);
1681 			sdio_release_host(bus->sdiodev->func1);
1682 			bus->cur_read.len = 0;
1683 			return 0;
1684 		}
1685 
1686 		/* Basic SD framing looks ok - process each packet (header) */
1687 
1688 		skb_queue_walk_safe(&bus->glom, pfirst, pnext) {
1689 			dptr = (u8 *) (pfirst->data);
1690 			sublen = get_unaligned_le16(dptr);
1691 			doff = brcmf_sdio_getdatoffset(&dptr[SDPCM_HWHDR_LEN]);
1692 
1693 			brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_DATA_ON(),
1694 					   dptr, pfirst->len,
1695 					   "Rx Subframe Data:\n");
1696 
1697 			__skb_trim(pfirst, sublen);
1698 			skb_pull(pfirst, doff);
1699 
1700 			if (pfirst->len == 0) {
1701 				skb_unlink(pfirst, &bus->glom);
1702 				brcmu_pkt_buf_free_skb(pfirst);
1703 				continue;
1704 			}
1705 
1706 			brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
1707 					   pfirst->data,
1708 					   min_t(int, pfirst->len, 32),
1709 					   "subframe %d to stack, %p (%p/%d) nxt/lnk %p/%p\n",
1710 					   bus->glom.qlen, pfirst, pfirst->data,
1711 					   pfirst->len, pfirst->next,
1712 					   pfirst->prev);
1713 			skb_unlink(pfirst, &bus->glom);
1714 			if (brcmf_sdio_fromevntchan(&dptr[SDPCM_HWHDR_LEN]))
1715 				brcmf_rx_event(bus->sdiodev->dev, pfirst);
1716 			else
1717 				brcmf_rx_frame(bus->sdiodev->dev, pfirst,
1718 					       false, false);
1719 			bus->sdcnt.rxglompkts++;
1720 		}
1721 
1722 		bus->sdcnt.rxglomframes++;
1723 	}
1724 	return num;
1725 }
1726 
1727 static int brcmf_sdio_dcmd_resp_wait(struct brcmf_sdio *bus, uint *condition,
1728 				     bool *pending)
1729 {
1730 	DECLARE_WAITQUEUE(wait, current);
1731 	int timeout = DCMD_RESP_TIMEOUT;
1732 
1733 	/* Wait until control frame is available */
1734 	add_wait_queue(&bus->dcmd_resp_wait, &wait);
1735 	set_current_state(TASK_INTERRUPTIBLE);
1736 
1737 	while (!(*condition) && (!signal_pending(current) && timeout))
1738 		timeout = schedule_timeout(timeout);
1739 
1740 	if (signal_pending(current))
1741 		*pending = true;
1742 
1743 	set_current_state(TASK_RUNNING);
1744 	remove_wait_queue(&bus->dcmd_resp_wait, &wait);
1745 
1746 	return timeout;
1747 }
1748 
1749 static int brcmf_sdio_dcmd_resp_wake(struct brcmf_sdio *bus)
1750 {
1751 	wake_up_interruptible(&bus->dcmd_resp_wait);
1752 
1753 	return 0;
1754 }
1755 static void
1756 brcmf_sdio_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)
1757 {
1758 	uint rdlen, pad;
1759 	u8 *buf = NULL, *rbuf;
1760 	int sdret;
1761 
1762 	brcmf_dbg(SDIO, "Enter\n");
1763 	if (bus->rxblen)
1764 		buf = vzalloc(bus->rxblen);
1765 	if (!buf)
1766 		goto done;
1767 
1768 	rbuf = bus->rxbuf;
1769 	pad = ((unsigned long)rbuf % bus->head_align);
1770 	if (pad)
1771 		rbuf += (bus->head_align - pad);
1772 
1773 	/* Copy the already-read portion over */
1774 	memcpy(buf, hdr, BRCMF_FIRSTREAD);
1775 	if (len <= BRCMF_FIRSTREAD)
1776 		goto gotpkt;
1777 
1778 	/* Raise rdlen to next SDIO block to avoid tail command */
1779 	rdlen = len - BRCMF_FIRSTREAD;
1780 	if (bus->roundup && bus->blocksize && (rdlen > bus->blocksize)) {
1781 		pad = bus->blocksize - (rdlen % bus->blocksize);
1782 		if ((pad <= bus->roundup) && (pad < bus->blocksize) &&
1783 		    ((len + pad) < bus->sdiodev->bus_if->maxctl))
1784 			rdlen += pad;
1785 	} else if (rdlen % bus->head_align) {
1786 		rdlen += bus->head_align - (rdlen % bus->head_align);
1787 	}
1788 
1789 	/* Drop if the read is too big or it exceeds our maximum */
1790 	if ((rdlen + BRCMF_FIRSTREAD) > bus->sdiodev->bus_if->maxctl) {
1791 		brcmf_err("%d-byte control read exceeds %d-byte buffer\n",
1792 			  rdlen, bus->sdiodev->bus_if->maxctl);
1793 		brcmf_sdio_rxfail(bus, false, false);
1794 		goto done;
1795 	}
1796 
1797 	if ((len - doff) > bus->sdiodev->bus_if->maxctl) {
1798 		brcmf_err("%d-byte ctl frame (%d-byte ctl data) exceeds %d-byte limit\n",
1799 			  len, len - doff, bus->sdiodev->bus_if->maxctl);
1800 		bus->sdcnt.rx_toolong++;
1801 		brcmf_sdio_rxfail(bus, false, false);
1802 		goto done;
1803 	}
1804 
1805 	/* Read remain of frame body */
1806 	sdret = brcmf_sdiod_recv_buf(bus->sdiodev, rbuf, rdlen);
1807 	bus->sdcnt.f2rxdata++;
1808 
1809 	/* Control frame failures need retransmission */
1810 	if (sdret < 0) {
1811 		brcmf_err("read %d control bytes failed: %d\n",
1812 			  rdlen, sdret);
1813 		bus->sdcnt.rxc_errors++;
1814 		brcmf_sdio_rxfail(bus, true, true);
1815 		goto done;
1816 	} else
1817 		memcpy(buf + BRCMF_FIRSTREAD, rbuf, rdlen);
1818 
1819 gotpkt:
1820 
1821 	brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_CTL_ON(),
1822 			   buf, len, "RxCtrl:\n");
1823 
1824 	/* Point to valid data and indicate its length */
1825 	spin_lock_bh(&bus->rxctl_lock);
1826 	if (bus->rxctl) {
1827 		brcmf_err("last control frame is being processed.\n");
1828 		spin_unlock_bh(&bus->rxctl_lock);
1829 		vfree(buf);
1830 		goto done;
1831 	}
1832 	bus->rxctl = buf + doff;
1833 	bus->rxctl_orig = buf;
1834 	bus->rxlen = len - doff;
1835 	spin_unlock_bh(&bus->rxctl_lock);
1836 
1837 done:
1838 	/* Awake any waiters */
1839 	brcmf_sdio_dcmd_resp_wake(bus);
1840 }
1841 
1842 /* Pad read to blocksize for efficiency */
1843 static void brcmf_sdio_pad(struct brcmf_sdio *bus, u16 *pad, u16 *rdlen)
1844 {
1845 	if (bus->roundup && bus->blocksize && *rdlen > bus->blocksize) {
1846 		*pad = bus->blocksize - (*rdlen % bus->blocksize);
1847 		if (*pad <= bus->roundup && *pad < bus->blocksize &&
1848 		    *rdlen + *pad + BRCMF_FIRSTREAD < MAX_RX_DATASZ)
1849 			*rdlen += *pad;
1850 	} else if (*rdlen % bus->head_align) {
1851 		*rdlen += bus->head_align - (*rdlen % bus->head_align);
1852 	}
1853 }
1854 
1855 static uint brcmf_sdio_readframes(struct brcmf_sdio *bus, uint maxframes)
1856 {
1857 	struct sk_buff *pkt;		/* Packet for event or data frames */
1858 	u16 pad;		/* Number of pad bytes to read */
1859 	uint rxleft = 0;	/* Remaining number of frames allowed */
1860 	int ret;		/* Return code from calls */
1861 	uint rxcount = 0;	/* Total frames read */
1862 	struct brcmf_sdio_hdrinfo *rd = &bus->cur_read, rd_new;
1863 	u8 head_read = 0;
1864 
1865 	brcmf_dbg(SDIO, "Enter\n");
1866 
1867 	/* Not finished unless we encounter no more frames indication */
1868 	bus->rxpending = true;
1869 
1870 	for (rd->seq_num = bus->rx_seq, rxleft = maxframes;
1871 	     !bus->rxskip && rxleft && bus->sdiodev->state == BRCMF_SDIOD_DATA;
1872 	     rd->seq_num++, rxleft--) {
1873 
1874 		/* Handle glomming separately */
1875 		if (bus->glomd || !skb_queue_empty(&bus->glom)) {
1876 			u8 cnt;
1877 			brcmf_dbg(GLOM, "calling rxglom: glomd %p, glom %p\n",
1878 				  bus->glomd, skb_peek(&bus->glom));
1879 			cnt = brcmf_sdio_rxglom(bus, rd->seq_num);
1880 			brcmf_dbg(GLOM, "rxglom returned %d\n", cnt);
1881 			rd->seq_num += cnt - 1;
1882 			rxleft = (rxleft > cnt) ? (rxleft - cnt) : 1;
1883 			continue;
1884 		}
1885 
1886 		rd->len_left = rd->len;
1887 		/* read header first for unknown frame length */
1888 		sdio_claim_host(bus->sdiodev->func1);
1889 		if (!rd->len) {
1890 			ret = brcmf_sdiod_recv_buf(bus->sdiodev,
1891 						   bus->rxhdr, BRCMF_FIRSTREAD);
1892 			bus->sdcnt.f2rxhdrs++;
1893 			if (ret < 0) {
1894 				brcmf_err("RXHEADER FAILED: %d\n",
1895 					  ret);
1896 				bus->sdcnt.rx_hdrfail++;
1897 				brcmf_sdio_rxfail(bus, true, true);
1898 				sdio_release_host(bus->sdiodev->func1);
1899 				continue;
1900 			}
1901 
1902 			brcmf_dbg_hex_dump(BRCMF_BYTES_ON() || BRCMF_HDRS_ON(),
1903 					   bus->rxhdr, SDPCM_HDRLEN,
1904 					   "RxHdr:\n");
1905 
1906 			if (brcmf_sdio_hdparse(bus, bus->rxhdr, rd,
1907 					       BRCMF_SDIO_FT_NORMAL)) {
1908 				sdio_release_host(bus->sdiodev->func1);
1909 				if (!bus->rxpending)
1910 					break;
1911 				else
1912 					continue;
1913 			}
1914 
1915 			if (rd->channel == SDPCM_CONTROL_CHANNEL) {
1916 				brcmf_sdio_read_control(bus, bus->rxhdr,
1917 							rd->len,
1918 							rd->dat_offset);
1919 				/* prepare the descriptor for the next read */
1920 				rd->len = rd->len_nxtfrm << 4;
1921 				rd->len_nxtfrm = 0;
1922 				/* treat all packet as event if we don't know */
1923 				rd->channel = SDPCM_EVENT_CHANNEL;
1924 				sdio_release_host(bus->sdiodev->func1);
1925 				continue;
1926 			}
1927 			rd->len_left = rd->len > BRCMF_FIRSTREAD ?
1928 				       rd->len - BRCMF_FIRSTREAD : 0;
1929 			head_read = BRCMF_FIRSTREAD;
1930 		}
1931 
1932 		brcmf_sdio_pad(bus, &pad, &rd->len_left);
1933 
1934 		pkt = brcmu_pkt_buf_get_skb(rd->len_left + head_read +
1935 					    bus->head_align);
1936 		if (!pkt) {
1937 			/* Give up on data, request rtx of events */
1938 			brcmf_err("brcmu_pkt_buf_get_skb failed\n");
1939 			brcmf_sdio_rxfail(bus, false,
1940 					    RETRYCHAN(rd->channel));
1941 			sdio_release_host(bus->sdiodev->func1);
1942 			continue;
1943 		}
1944 		skb_pull(pkt, head_read);
1945 		pkt_align(pkt, rd->len_left, bus->head_align);
1946 
1947 		ret = brcmf_sdiod_recv_pkt(bus->sdiodev, pkt);
1948 		bus->sdcnt.f2rxdata++;
1949 		sdio_release_host(bus->sdiodev->func1);
1950 
1951 		if (ret < 0) {
1952 			brcmf_err("read %d bytes from channel %d failed: %d\n",
1953 				  rd->len, rd->channel, ret);
1954 			brcmu_pkt_buf_free_skb(pkt);
1955 			sdio_claim_host(bus->sdiodev->func1);
1956 			brcmf_sdio_rxfail(bus, true,
1957 					    RETRYCHAN(rd->channel));
1958 			sdio_release_host(bus->sdiodev->func1);
1959 			continue;
1960 		}
1961 
1962 		if (head_read) {
1963 			skb_push(pkt, head_read);
1964 			memcpy(pkt->data, bus->rxhdr, head_read);
1965 			head_read = 0;
1966 		} else {
1967 			memcpy(bus->rxhdr, pkt->data, SDPCM_HDRLEN);
1968 			rd_new.seq_num = rd->seq_num;
1969 			sdio_claim_host(bus->sdiodev->func1);
1970 			if (brcmf_sdio_hdparse(bus, bus->rxhdr, &rd_new,
1971 					       BRCMF_SDIO_FT_NORMAL)) {
1972 				rd->len = 0;
1973 				brcmf_sdio_rxfail(bus, true, true);
1974 				sdio_release_host(bus->sdiodev->func1);
1975 				brcmu_pkt_buf_free_skb(pkt);
1976 				continue;
1977 			}
1978 			bus->sdcnt.rx_readahead_cnt++;
1979 			if (rd->len != roundup(rd_new.len, 16)) {
1980 				brcmf_err("frame length mismatch:read %d, should be %d\n",
1981 					  rd->len,
1982 					  roundup(rd_new.len, 16) >> 4);
1983 				rd->len = 0;
1984 				brcmf_sdio_rxfail(bus, true, true);
1985 				sdio_release_host(bus->sdiodev->func1);
1986 				brcmu_pkt_buf_free_skb(pkt);
1987 				continue;
1988 			}
1989 			sdio_release_host(bus->sdiodev->func1);
1990 			rd->len_nxtfrm = rd_new.len_nxtfrm;
1991 			rd->channel = rd_new.channel;
1992 			rd->dat_offset = rd_new.dat_offset;
1993 
1994 			brcmf_dbg_hex_dump(!(BRCMF_BYTES_ON() &&
1995 					     BRCMF_DATA_ON()) &&
1996 					   BRCMF_HDRS_ON(),
1997 					   bus->rxhdr, SDPCM_HDRLEN,
1998 					   "RxHdr:\n");
1999 
2000 			if (rd_new.channel == SDPCM_CONTROL_CHANNEL) {
2001 				brcmf_err("readahead on control packet %d?\n",
2002 					  rd_new.seq_num);
2003 				/* Force retry w/normal header read */
2004 				rd->len = 0;
2005 				sdio_claim_host(bus->sdiodev->func1);
2006 				brcmf_sdio_rxfail(bus, false, true);
2007 				sdio_release_host(bus->sdiodev->func1);
2008 				brcmu_pkt_buf_free_skb(pkt);
2009 				continue;
2010 			}
2011 		}
2012 
2013 		brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_DATA_ON(),
2014 				   pkt->data, rd->len, "Rx Data:\n");
2015 
2016 		/* Save superframe descriptor and allocate packet frame */
2017 		if (rd->channel == SDPCM_GLOM_CHANNEL) {
2018 			if (SDPCM_GLOMDESC(&bus->rxhdr[SDPCM_HWHDR_LEN])) {
2019 				brcmf_dbg(GLOM, "glom descriptor, %d bytes:\n",
2020 					  rd->len);
2021 				brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
2022 						   pkt->data, rd->len,
2023 						   "Glom Data:\n");
2024 				__skb_trim(pkt, rd->len);
2025 				skb_pull(pkt, SDPCM_HDRLEN);
2026 				bus->glomd = pkt;
2027 			} else {
2028 				brcmf_err("%s: glom superframe w/o "
2029 					  "descriptor!\n", __func__);
2030 				sdio_claim_host(bus->sdiodev->func1);
2031 				brcmf_sdio_rxfail(bus, false, false);
2032 				sdio_release_host(bus->sdiodev->func1);
2033 			}
2034 			/* prepare the descriptor for the next read */
2035 			rd->len = rd->len_nxtfrm << 4;
2036 			rd->len_nxtfrm = 0;
2037 			/* treat all packet as event if we don't know */
2038 			rd->channel = SDPCM_EVENT_CHANNEL;
2039 			continue;
2040 		}
2041 
2042 		/* Fill in packet len and prio, deliver upward */
2043 		__skb_trim(pkt, rd->len);
2044 		skb_pull(pkt, rd->dat_offset);
2045 
2046 		if (pkt->len == 0)
2047 			brcmu_pkt_buf_free_skb(pkt);
2048 		else if (rd->channel == SDPCM_EVENT_CHANNEL)
2049 			brcmf_rx_event(bus->sdiodev->dev, pkt);
2050 		else
2051 			brcmf_rx_frame(bus->sdiodev->dev, pkt,
2052 				       false, false);
2053 
2054 		/* prepare the descriptor for the next read */
2055 		rd->len = rd->len_nxtfrm << 4;
2056 		rd->len_nxtfrm = 0;
2057 		/* treat all packet as event if we don't know */
2058 		rd->channel = SDPCM_EVENT_CHANNEL;
2059 	}
2060 
2061 	rxcount = maxframes - rxleft;
2062 	/* Message if we hit the limit */
2063 	if (!rxleft)
2064 		brcmf_dbg(DATA, "hit rx limit of %d frames\n", maxframes);
2065 	else
2066 		brcmf_dbg(DATA, "processed %d frames\n", rxcount);
2067 	/* Back off rxseq if awaiting rtx, update rx_seq */
2068 	if (bus->rxskip)
2069 		rd->seq_num--;
2070 	bus->rx_seq = rd->seq_num;
2071 
2072 	return rxcount;
2073 }
2074 
2075 static void
2076 brcmf_sdio_wait_event_wakeup(struct brcmf_sdio *bus)
2077 {
2078 	wake_up_interruptible(&bus->ctrl_wait);
2079 	return;
2080 }
2081 
2082 static int brcmf_sdio_txpkt_hdalign(struct brcmf_sdio *bus, struct sk_buff *pkt)
2083 {
2084 	struct brcmf_bus_stats *stats;
2085 	u16 head_pad;
2086 	u8 *dat_buf;
2087 
2088 	dat_buf = (u8 *)(pkt->data);
2089 
2090 	/* Check head padding */
2091 	head_pad = ((unsigned long)dat_buf % bus->head_align);
2092 	if (head_pad) {
2093 		if (skb_headroom(pkt) < head_pad) {
2094 			stats = &bus->sdiodev->bus_if->stats;
2095 			atomic_inc(&stats->pktcowed);
2096 			if (skb_cow_head(pkt, head_pad)) {
2097 				atomic_inc(&stats->pktcow_failed);
2098 				return -ENOMEM;
2099 			}
2100 			head_pad = 0;
2101 		}
2102 		skb_push(pkt, head_pad);
2103 		dat_buf = (u8 *)(pkt->data);
2104 	}
2105 	memset(dat_buf, 0, head_pad + bus->tx_hdrlen);
2106 	return head_pad;
2107 }
2108 
2109 /*
2110  * struct brcmf_skbuff_cb reserves first two bytes in sk_buff::cb for
2111  * bus layer usage.
2112  */
2113 /* flag marking a dummy skb added for DMA alignment requirement */
2114 #define ALIGN_SKB_FLAG		0x8000
2115 /* bit mask of data length chopped from the previous packet */
2116 #define ALIGN_SKB_CHOP_LEN_MASK	0x7fff
2117 
2118 static int brcmf_sdio_txpkt_prep_sg(struct brcmf_sdio *bus,
2119 				    struct sk_buff_head *pktq,
2120 				    struct sk_buff *pkt, u16 total_len)
2121 {
2122 	struct brcmf_sdio_dev *sdiodev;
2123 	struct sk_buff *pkt_pad;
2124 	u16 tail_pad, tail_chop, chain_pad;
2125 	unsigned int blksize;
2126 	bool lastfrm;
2127 	int ntail, ret;
2128 
2129 	sdiodev = bus->sdiodev;
2130 	blksize = sdiodev->func2->cur_blksize;
2131 	/* sg entry alignment should be a divisor of block size */
2132 	WARN_ON(blksize % bus->sgentry_align);
2133 
2134 	/* Check tail padding */
2135 	lastfrm = skb_queue_is_last(pktq, pkt);
2136 	tail_pad = 0;
2137 	tail_chop = pkt->len % bus->sgentry_align;
2138 	if (tail_chop)
2139 		tail_pad = bus->sgentry_align - tail_chop;
2140 	chain_pad = (total_len + tail_pad) % blksize;
2141 	if (lastfrm && chain_pad)
2142 		tail_pad += blksize - chain_pad;
2143 	if (skb_tailroom(pkt) < tail_pad && pkt->len > blksize) {
2144 		pkt_pad = brcmu_pkt_buf_get_skb(tail_pad + tail_chop +
2145 						bus->head_align);
2146 		if (pkt_pad == NULL)
2147 			return -ENOMEM;
2148 		ret = brcmf_sdio_txpkt_hdalign(bus, pkt_pad);
2149 		if (unlikely(ret < 0)) {
2150 			kfree_skb(pkt_pad);
2151 			return ret;
2152 		}
2153 		memcpy(pkt_pad->data,
2154 		       pkt->data + pkt->len - tail_chop,
2155 		       tail_chop);
2156 		*(u16 *)(pkt_pad->cb) = ALIGN_SKB_FLAG + tail_chop;
2157 		skb_trim(pkt, pkt->len - tail_chop);
2158 		skb_trim(pkt_pad, tail_pad + tail_chop);
2159 		__skb_queue_after(pktq, pkt, pkt_pad);
2160 	} else {
2161 		ntail = pkt->data_len + tail_pad -
2162 			(pkt->end - pkt->tail);
2163 		if (skb_cloned(pkt) || ntail > 0)
2164 			if (pskb_expand_head(pkt, 0, ntail, GFP_ATOMIC))
2165 				return -ENOMEM;
2166 		if (skb_linearize(pkt))
2167 			return -ENOMEM;
2168 		__skb_put(pkt, tail_pad);
2169 	}
2170 
2171 	return tail_pad;
2172 }
2173 
2174 /**
2175  * brcmf_sdio_txpkt_prep - packet preparation for transmit
2176  * @bus: brcmf_sdio structure pointer
2177  * @pktq: packet list pointer
2178  * @chan: virtual channel to transmit the packet
2179  *
2180  * Processes to be applied to the packet
2181  *	- Align data buffer pointer
2182  *	- Align data buffer length
2183  *	- Prepare header
2184  * Return: negative value if there is error
2185  */
2186 static int
2187 brcmf_sdio_txpkt_prep(struct brcmf_sdio *bus, struct sk_buff_head *pktq,
2188 		      uint chan)
2189 {
2190 	u16 head_pad, total_len;
2191 	struct sk_buff *pkt_next;
2192 	u8 txseq;
2193 	int ret;
2194 	struct brcmf_sdio_hdrinfo hd_info = {0};
2195 
2196 	txseq = bus->tx_seq;
2197 	total_len = 0;
2198 	skb_queue_walk(pktq, pkt_next) {
2199 		/* alignment packet inserted in previous
2200 		 * loop cycle can be skipped as it is
2201 		 * already properly aligned and does not
2202 		 * need an sdpcm header.
2203 		 */
2204 		if (*(u16 *)(pkt_next->cb) & ALIGN_SKB_FLAG)
2205 			continue;
2206 
2207 		/* align packet data pointer */
2208 		ret = brcmf_sdio_txpkt_hdalign(bus, pkt_next);
2209 		if (ret < 0)
2210 			return ret;
2211 		head_pad = (u16)ret;
2212 		if (head_pad)
2213 			memset(pkt_next->data + bus->tx_hdrlen, 0, head_pad);
2214 
2215 		total_len += pkt_next->len;
2216 
2217 		hd_info.len = pkt_next->len;
2218 		hd_info.lastfrm = skb_queue_is_last(pktq, pkt_next);
2219 		if (bus->txglom && pktq->qlen > 1) {
2220 			ret = brcmf_sdio_txpkt_prep_sg(bus, pktq,
2221 						       pkt_next, total_len);
2222 			if (ret < 0)
2223 				return ret;
2224 			hd_info.tail_pad = (u16)ret;
2225 			total_len += (u16)ret;
2226 		}
2227 
2228 		hd_info.channel = chan;
2229 		hd_info.dat_offset = head_pad + bus->tx_hdrlen;
2230 		hd_info.seq_num = txseq++;
2231 
2232 		/* Now fill the header */
2233 		brcmf_sdio_hdpack(bus, pkt_next->data, &hd_info);
2234 
2235 		if (BRCMF_BYTES_ON() &&
2236 		    ((BRCMF_CTL_ON() && chan == SDPCM_CONTROL_CHANNEL) ||
2237 		     (BRCMF_DATA_ON() && chan != SDPCM_CONTROL_CHANNEL)))
2238 			brcmf_dbg_hex_dump(true, pkt_next->data, hd_info.len,
2239 					   "Tx Frame:\n");
2240 		else if (BRCMF_HDRS_ON())
2241 			brcmf_dbg_hex_dump(true, pkt_next->data,
2242 					   head_pad + bus->tx_hdrlen,
2243 					   "Tx Header:\n");
2244 	}
2245 	/* Hardware length tag of the first packet should be total
2246 	 * length of the chain (including padding)
2247 	 */
2248 	if (bus->txglom)
2249 		brcmf_sdio_update_hwhdr(__skb_peek(pktq)->data, total_len);
2250 	return 0;
2251 }
2252 
2253 /**
2254  * brcmf_sdio_txpkt_postp - packet post processing for transmit
2255  * @bus: brcmf_sdio structure pointer
2256  * @pktq: packet list pointer
2257  *
2258  * Processes to be applied to the packet
2259  *	- Remove head padding
2260  *	- Remove tail padding
2261  */
2262 static void
2263 brcmf_sdio_txpkt_postp(struct brcmf_sdio *bus, struct sk_buff_head *pktq)
2264 {
2265 	u8 *hdr;
2266 	u32 dat_offset;
2267 	u16 tail_pad;
2268 	u16 dummy_flags, chop_len;
2269 	struct sk_buff *pkt_next, *tmp, *pkt_prev;
2270 
2271 	skb_queue_walk_safe(pktq, pkt_next, tmp) {
2272 		dummy_flags = *(u16 *)(pkt_next->cb);
2273 		if (dummy_flags & ALIGN_SKB_FLAG) {
2274 			chop_len = dummy_flags & ALIGN_SKB_CHOP_LEN_MASK;
2275 			if (chop_len) {
2276 				pkt_prev = pkt_next->prev;
2277 				skb_put(pkt_prev, chop_len);
2278 			}
2279 			__skb_unlink(pkt_next, pktq);
2280 			brcmu_pkt_buf_free_skb(pkt_next);
2281 		} else {
2282 			hdr = pkt_next->data + bus->tx_hdrlen - SDPCM_SWHDR_LEN;
2283 			dat_offset = le32_to_cpu(*(__le32 *)hdr);
2284 			dat_offset = (dat_offset & SDPCM_DOFFSET_MASK) >>
2285 				     SDPCM_DOFFSET_SHIFT;
2286 			skb_pull(pkt_next, dat_offset);
2287 			if (bus->txglom) {
2288 				tail_pad = le16_to_cpu(*(__le16 *)(hdr - 2));
2289 				skb_trim(pkt_next, pkt_next->len - tail_pad);
2290 			}
2291 		}
2292 	}
2293 }
2294 
2295 /* Writes a HW/SW header into the packet and sends it. */
2296 /* Assumes: (a) header space already there, (b) caller holds lock */
2297 static int brcmf_sdio_txpkt(struct brcmf_sdio *bus, struct sk_buff_head *pktq,
2298 			    uint chan)
2299 {
2300 	int ret;
2301 	struct sk_buff *pkt_next, *tmp;
2302 
2303 	brcmf_dbg(TRACE, "Enter\n");
2304 
2305 	ret = brcmf_sdio_txpkt_prep(bus, pktq, chan);
2306 	if (ret)
2307 		goto done;
2308 
2309 	sdio_claim_host(bus->sdiodev->func1);
2310 	ret = brcmf_sdiod_send_pkt(bus->sdiodev, pktq);
2311 	bus->sdcnt.f2txdata++;
2312 
2313 	if (ret < 0)
2314 		brcmf_sdio_txfail(bus);
2315 
2316 	sdio_release_host(bus->sdiodev->func1);
2317 
2318 done:
2319 	brcmf_sdio_txpkt_postp(bus, pktq);
2320 	if (ret == 0)
2321 		bus->tx_seq = (bus->tx_seq + pktq->qlen) % SDPCM_SEQ_WRAP;
2322 	skb_queue_walk_safe(pktq, pkt_next, tmp) {
2323 		__skb_unlink(pkt_next, pktq);
2324 		brcmf_proto_bcdc_txcomplete(bus->sdiodev->dev, pkt_next,
2325 					    ret == 0);
2326 	}
2327 	return ret;
2328 }
2329 
2330 static uint brcmf_sdio_sendfromq(struct brcmf_sdio *bus, uint maxframes)
2331 {
2332 	struct sk_buff *pkt;
2333 	struct sk_buff_head pktq;
2334 	u32 intstat_addr = bus->sdio_core->base + SD_REG(intstatus);
2335 	u32 intstatus = 0;
2336 	int ret = 0, prec_out, i;
2337 	uint cnt = 0;
2338 	u8 tx_prec_map, pkt_num;
2339 
2340 	brcmf_dbg(TRACE, "Enter\n");
2341 
2342 	tx_prec_map = ~bus->flowcontrol;
2343 
2344 	/* Send frames until the limit or some other event */
2345 	for (cnt = 0; (cnt < maxframes) && data_ok(bus);) {
2346 		pkt_num = 1;
2347 		if (bus->txglom)
2348 			pkt_num = min_t(u8, bus->tx_max - bus->tx_seq,
2349 					bus->sdiodev->txglomsz);
2350 		pkt_num = min_t(u32, pkt_num,
2351 				brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol));
2352 		__skb_queue_head_init(&pktq);
2353 		spin_lock_bh(&bus->txq_lock);
2354 		for (i = 0; i < pkt_num; i++) {
2355 			pkt = brcmu_pktq_mdeq(&bus->txq, tx_prec_map,
2356 					      &prec_out);
2357 			if (pkt == NULL)
2358 				break;
2359 			__skb_queue_tail(&pktq, pkt);
2360 		}
2361 		spin_unlock_bh(&bus->txq_lock);
2362 		if (i == 0)
2363 			break;
2364 
2365 		ret = brcmf_sdio_txpkt(bus, &pktq, SDPCM_DATA_CHANNEL);
2366 
2367 		cnt += i;
2368 
2369 		/* In poll mode, need to check for other events */
2370 		if (!bus->intr) {
2371 			/* Check device status, signal pending interrupt */
2372 			sdio_claim_host(bus->sdiodev->func1);
2373 			intstatus = brcmf_sdiod_readl(bus->sdiodev,
2374 						      intstat_addr, &ret);
2375 			sdio_release_host(bus->sdiodev->func1);
2376 
2377 			bus->sdcnt.f2txdata++;
2378 			if (ret != 0)
2379 				break;
2380 			if (intstatus & bus->hostintmask)
2381 				atomic_set(&bus->ipend, 1);
2382 		}
2383 	}
2384 
2385 	/* Deflow-control stack if needed */
2386 	if ((bus->sdiodev->state == BRCMF_SDIOD_DATA) &&
2387 	    bus->txoff && (pktq_len(&bus->txq) < TXLOW)) {
2388 		bus->txoff = false;
2389 		brcmf_proto_bcdc_txflowblock(bus->sdiodev->dev, false);
2390 	}
2391 
2392 	return cnt;
2393 }
2394 
2395 static int brcmf_sdio_tx_ctrlframe(struct brcmf_sdio *bus, u8 *frame, u16 len)
2396 {
2397 	u8 doff;
2398 	u16 pad;
2399 	uint retries = 0;
2400 	struct brcmf_sdio_hdrinfo hd_info = {0};
2401 	int ret;
2402 
2403 	brcmf_dbg(SDIO, "Enter\n");
2404 
2405 	/* Back the pointer to make room for bus header */
2406 	frame -= bus->tx_hdrlen;
2407 	len += bus->tx_hdrlen;
2408 
2409 	/* Add alignment padding (optional for ctl frames) */
2410 	doff = ((unsigned long)frame % bus->head_align);
2411 	if (doff) {
2412 		frame -= doff;
2413 		len += doff;
2414 		memset(frame + bus->tx_hdrlen, 0, doff);
2415 	}
2416 
2417 	/* Round send length to next SDIO block */
2418 	pad = 0;
2419 	if (bus->roundup && bus->blocksize && (len > bus->blocksize)) {
2420 		pad = bus->blocksize - (len % bus->blocksize);
2421 		if ((pad > bus->roundup) || (pad >= bus->blocksize))
2422 			pad = 0;
2423 	} else if (len % bus->head_align) {
2424 		pad = bus->head_align - (len % bus->head_align);
2425 	}
2426 	len += pad;
2427 
2428 	hd_info.len = len - pad;
2429 	hd_info.channel = SDPCM_CONTROL_CHANNEL;
2430 	hd_info.dat_offset = doff + bus->tx_hdrlen;
2431 	hd_info.seq_num = bus->tx_seq;
2432 	hd_info.lastfrm = true;
2433 	hd_info.tail_pad = pad;
2434 	brcmf_sdio_hdpack(bus, frame, &hd_info);
2435 
2436 	if (bus->txglom)
2437 		brcmf_sdio_update_hwhdr(frame, len);
2438 
2439 	brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_CTL_ON(),
2440 			   frame, len, "Tx Frame:\n");
2441 	brcmf_dbg_hex_dump(!(BRCMF_BYTES_ON() && BRCMF_CTL_ON()) &&
2442 			   BRCMF_HDRS_ON(),
2443 			   frame, min_t(u16, len, 16), "TxHdr:\n");
2444 
2445 	do {
2446 		ret = brcmf_sdiod_send_buf(bus->sdiodev, frame, len);
2447 
2448 		if (ret < 0)
2449 			brcmf_sdio_txfail(bus);
2450 		else
2451 			bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQ_WRAP;
2452 	} while (ret < 0 && retries++ < TXRETRIES);
2453 
2454 	return ret;
2455 }
2456 
2457 static bool brcmf_chip_is_ulp(struct brcmf_chip *ci)
2458 {
2459 	if (ci->chip == CY_CC_43012_CHIP_ID)
2460 		return true;
2461 	else
2462 		return false;
2463 }
2464 
2465 static void brcmf_sdio_bus_stop(struct device *dev)
2466 {
2467 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
2468 	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
2469 	struct brcmf_sdio *bus = sdiodev->bus;
2470 	struct brcmf_core *core = bus->sdio_core;
2471 	u32 local_hostintmask;
2472 	u8 saveclk, bpreq;
2473 	int err;
2474 
2475 	brcmf_dbg(TRACE, "Enter\n");
2476 
2477 	if (bus->watchdog_tsk) {
2478 		send_sig(SIGTERM, bus->watchdog_tsk, 1);
2479 		kthread_stop(bus->watchdog_tsk);
2480 		bus->watchdog_tsk = NULL;
2481 	}
2482 
2483 	if (sdiodev->state != BRCMF_SDIOD_NOMEDIUM) {
2484 		sdio_claim_host(sdiodev->func1);
2485 
2486 		/* Enable clock for device interrupts */
2487 		brcmf_sdio_bus_sleep(bus, false, false);
2488 
2489 		/* Disable and clear interrupts at the chip level also */
2490 		brcmf_sdiod_writel(sdiodev, core->base + SD_REG(hostintmask),
2491 				   0, NULL);
2492 
2493 		local_hostintmask = bus->hostintmask;
2494 		bus->hostintmask = 0;
2495 
2496 		/* Force backplane clocks to assure F2 interrupt propagates */
2497 		saveclk = brcmf_sdiod_readb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
2498 					    &err);
2499 		if (!err) {
2500 			bpreq = saveclk;
2501 			bpreq |= brcmf_chip_is_ulp(bus->ci) ?
2502 				SBSDIO_HT_AVAIL_REQ : SBSDIO_FORCE_HT;
2503 			brcmf_sdiod_writeb(sdiodev,
2504 					   SBSDIO_FUNC1_CHIPCLKCSR,
2505 					   bpreq, &err);
2506 		}
2507 		if (err)
2508 			brcmf_err("Failed to force clock for F2: err %d\n",
2509 				  err);
2510 
2511 		/* Turn off the bus (F2), free any pending packets */
2512 		brcmf_dbg(INTR, "disable SDIO interrupts\n");
2513 		sdio_disable_func(sdiodev->func2);
2514 
2515 		/* Clear any pending interrupts now that F2 is disabled */
2516 		brcmf_sdiod_writel(sdiodev, core->base + SD_REG(intstatus),
2517 				   local_hostintmask, NULL);
2518 
2519 		sdio_release_host(sdiodev->func1);
2520 	}
2521 	/* Clear the data packet queues */
2522 	brcmu_pktq_flush(&bus->txq, true, NULL, NULL);
2523 
2524 	/* Clear any held glomming stuff */
2525 	brcmu_pkt_buf_free_skb(bus->glomd);
2526 	brcmf_sdio_free_glom(bus);
2527 
2528 	/* Clear rx control and wake any waiters */
2529 	spin_lock_bh(&bus->rxctl_lock);
2530 	bus->rxlen = 0;
2531 	spin_unlock_bh(&bus->rxctl_lock);
2532 	brcmf_sdio_dcmd_resp_wake(bus);
2533 
2534 	/* Reset some F2 state stuff */
2535 	bus->rxskip = false;
2536 	bus->tx_seq = bus->rx_seq = 0;
2537 }
2538 
2539 static inline void brcmf_sdio_clrintr(struct brcmf_sdio *bus)
2540 {
2541 	struct brcmf_sdio_dev *sdiodev;
2542 	unsigned long flags;
2543 
2544 	sdiodev = bus->sdiodev;
2545 	if (sdiodev->oob_irq_requested) {
2546 		spin_lock_irqsave(&sdiodev->irq_en_lock, flags);
2547 		if (!sdiodev->irq_en && !atomic_read(&bus->ipend)) {
2548 			enable_irq(sdiodev->settings->bus.sdio.oob_irq_nr);
2549 			sdiodev->irq_en = true;
2550 		}
2551 		spin_unlock_irqrestore(&sdiodev->irq_en_lock, flags);
2552 	}
2553 }
2554 
2555 static int brcmf_sdio_intr_rstatus(struct brcmf_sdio *bus)
2556 {
2557 	struct brcmf_core *core = bus->sdio_core;
2558 	u32 addr;
2559 	unsigned long val;
2560 	int ret;
2561 
2562 	addr = core->base + SD_REG(intstatus);
2563 
2564 	val = brcmf_sdiod_readl(bus->sdiodev, addr, &ret);
2565 	bus->sdcnt.f1regdata++;
2566 	if (ret != 0)
2567 		return ret;
2568 
2569 	val &= bus->hostintmask;
2570 	atomic_set(&bus->fcstate, !!(val & I_HMB_FC_STATE));
2571 
2572 	/* Clear interrupts */
2573 	if (val) {
2574 		brcmf_sdiod_writel(bus->sdiodev, addr, val, &ret);
2575 		bus->sdcnt.f1regdata++;
2576 		atomic_or(val, &bus->intstatus);
2577 	}
2578 
2579 	return ret;
2580 }
2581 
2582 static void brcmf_sdio_dpc(struct brcmf_sdio *bus)
2583 {
2584 	struct brcmf_sdio_dev *sdiod = bus->sdiodev;
2585 	u32 newstatus = 0;
2586 	u32 intstat_addr = bus->sdio_core->base + SD_REG(intstatus);
2587 	unsigned long intstatus;
2588 	uint txlimit = bus->txbound;	/* Tx frames to send before resched */
2589 	uint framecnt;			/* Temporary counter of tx/rx frames */
2590 	int err = 0;
2591 
2592 	brcmf_dbg(SDIO, "Enter\n");
2593 
2594 	sdio_claim_host(bus->sdiodev->func1);
2595 
2596 	/* If waiting for HTAVAIL, check status */
2597 	if (!bus->sr_enabled && bus->clkstate == CLK_PENDING) {
2598 		u8 clkctl, devctl = 0;
2599 
2600 #ifdef DEBUG
2601 		/* Check for inconsistent device control */
2602 		devctl = brcmf_sdiod_readb(bus->sdiodev, SBSDIO_DEVICE_CTL,
2603 					   &err);
2604 #endif				/* DEBUG */
2605 
2606 		/* Read CSR, if clock on switch to AVAIL, else ignore */
2607 		clkctl = brcmf_sdiod_readb(bus->sdiodev,
2608 					   SBSDIO_FUNC1_CHIPCLKCSR, &err);
2609 
2610 		brcmf_dbg(SDIO, "DPC: PENDING, devctl 0x%02x clkctl 0x%02x\n",
2611 			  devctl, clkctl);
2612 
2613 		if (SBSDIO_HTAV(clkctl)) {
2614 			devctl = brcmf_sdiod_readb(bus->sdiodev,
2615 						   SBSDIO_DEVICE_CTL, &err);
2616 			devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
2617 			brcmf_sdiod_writeb(bus->sdiodev,
2618 					   SBSDIO_DEVICE_CTL, devctl, &err);
2619 			bus->clkstate = CLK_AVAIL;
2620 		}
2621 	}
2622 
2623 	/* Make sure backplane clock is on */
2624 	brcmf_sdio_bus_sleep(bus, false, true);
2625 
2626 	/* Pending interrupt indicates new device status */
2627 	if (atomic_read(&bus->ipend) > 0) {
2628 		atomic_set(&bus->ipend, 0);
2629 		err = brcmf_sdio_intr_rstatus(bus);
2630 	}
2631 
2632 	/* Start with leftover status bits */
2633 	intstatus = atomic_xchg(&bus->intstatus, 0);
2634 
2635 	/* Handle flow-control change: read new state in case our ack
2636 	 * crossed another change interrupt.  If change still set, assume
2637 	 * FC ON for safety, let next loop through do the debounce.
2638 	 */
2639 	if (intstatus & I_HMB_FC_CHANGE) {
2640 		intstatus &= ~I_HMB_FC_CHANGE;
2641 		brcmf_sdiod_writel(sdiod, intstat_addr, I_HMB_FC_CHANGE, &err);
2642 
2643 		newstatus = brcmf_sdiod_readl(sdiod, intstat_addr, &err);
2644 
2645 		bus->sdcnt.f1regdata += 2;
2646 		atomic_set(&bus->fcstate,
2647 			   !!(newstatus & (I_HMB_FC_STATE | I_HMB_FC_CHANGE)));
2648 		intstatus |= (newstatus & bus->hostintmask);
2649 	}
2650 
2651 	/* Handle host mailbox indication */
2652 	if (intstatus & I_HMB_HOST_INT) {
2653 		intstatus &= ~I_HMB_HOST_INT;
2654 		intstatus |= brcmf_sdio_hostmail(bus);
2655 	}
2656 
2657 	sdio_release_host(bus->sdiodev->func1);
2658 
2659 	/* Generally don't ask for these, can get CRC errors... */
2660 	if (intstatus & I_WR_OOSYNC) {
2661 		brcmf_err("Dongle reports WR_OOSYNC\n");
2662 		intstatus &= ~I_WR_OOSYNC;
2663 	}
2664 
2665 	if (intstatus & I_RD_OOSYNC) {
2666 		brcmf_err("Dongle reports RD_OOSYNC\n");
2667 		intstatus &= ~I_RD_OOSYNC;
2668 	}
2669 
2670 	if (intstatus & I_SBINT) {
2671 		brcmf_err("Dongle reports SBINT\n");
2672 		intstatus &= ~I_SBINT;
2673 	}
2674 
2675 	/* Would be active due to wake-wlan in gSPI */
2676 	if (intstatus & I_CHIPACTIVE) {
2677 		brcmf_dbg(SDIO, "Dongle reports CHIPACTIVE\n");
2678 		intstatus &= ~I_CHIPACTIVE;
2679 	}
2680 
2681 	/* Ignore frame indications if rxskip is set */
2682 	if (bus->rxskip)
2683 		intstatus &= ~I_HMB_FRAME_IND;
2684 
2685 	/* On frame indication, read available frames */
2686 	if ((intstatus & I_HMB_FRAME_IND) && (bus->clkstate == CLK_AVAIL)) {
2687 		brcmf_sdio_readframes(bus, bus->rxbound);
2688 		if (!bus->rxpending)
2689 			intstatus &= ~I_HMB_FRAME_IND;
2690 	}
2691 
2692 	/* Keep still-pending events for next scheduling */
2693 	if (intstatus)
2694 		atomic_or(intstatus, &bus->intstatus);
2695 
2696 	brcmf_sdio_clrintr(bus);
2697 
2698 	if (bus->ctrl_frame_stat && (bus->clkstate == CLK_AVAIL) &&
2699 	    txctl_ok(bus)) {
2700 		sdio_claim_host(bus->sdiodev->func1);
2701 		if (bus->ctrl_frame_stat) {
2702 			err = brcmf_sdio_tx_ctrlframe(bus,  bus->ctrl_frame_buf,
2703 						      bus->ctrl_frame_len);
2704 			bus->ctrl_frame_err = err;
2705 			wmb();
2706 			bus->ctrl_frame_stat = false;
2707 			if (err)
2708 				brcmf_err("sdio ctrlframe tx failed err=%d\n",
2709 					  err);
2710 		}
2711 		sdio_release_host(bus->sdiodev->func1);
2712 		brcmf_sdio_wait_event_wakeup(bus);
2713 	}
2714 	/* Send queued frames (limit 1 if rx may still be pending) */
2715 	if ((bus->clkstate == CLK_AVAIL) && !atomic_read(&bus->fcstate) &&
2716 	    brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol) && txlimit &&
2717 	    data_ok(bus)) {
2718 		framecnt = bus->rxpending ? min(txlimit, bus->txminmax) :
2719 					    txlimit;
2720 		brcmf_sdio_sendfromq(bus, framecnt);
2721 	}
2722 
2723 	if ((bus->sdiodev->state != BRCMF_SDIOD_DATA) || (err != 0)) {
2724 		brcmf_err("failed backplane access over SDIO, halting operation\n");
2725 		atomic_set(&bus->intstatus, 0);
2726 		if (bus->ctrl_frame_stat) {
2727 			sdio_claim_host(bus->sdiodev->func1);
2728 			if (bus->ctrl_frame_stat) {
2729 				bus->ctrl_frame_err = -ENODEV;
2730 				wmb();
2731 				bus->ctrl_frame_stat = false;
2732 				brcmf_sdio_wait_event_wakeup(bus);
2733 			}
2734 			sdio_release_host(bus->sdiodev->func1);
2735 		}
2736 	} else if (atomic_read(&bus->intstatus) ||
2737 		   atomic_read(&bus->ipend) > 0 ||
2738 		   (!atomic_read(&bus->fcstate) &&
2739 		    brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol) &&
2740 		    data_ok(bus))) {
2741 		bus->dpc_triggered = true;
2742 	}
2743 }
2744 
2745 static struct pktq *brcmf_sdio_bus_gettxq(struct device *dev)
2746 {
2747 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
2748 	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
2749 	struct brcmf_sdio *bus = sdiodev->bus;
2750 
2751 	return &bus->txq;
2752 }
2753 
2754 static bool brcmf_sdio_prec_enq(struct pktq *q, struct sk_buff *pkt, int prec)
2755 {
2756 	struct sk_buff *p;
2757 	int eprec = -1;		/* precedence to evict from */
2758 
2759 	/* Fast case, precedence queue is not full and we are also not
2760 	 * exceeding total queue length
2761 	 */
2762 	if (!pktq_pfull(q, prec) && !pktq_full(q)) {
2763 		brcmu_pktq_penq(q, prec, pkt);
2764 		return true;
2765 	}
2766 
2767 	/* Determine precedence from which to evict packet, if any */
2768 	if (pktq_pfull(q, prec)) {
2769 		eprec = prec;
2770 	} else if (pktq_full(q)) {
2771 		p = brcmu_pktq_peek_tail(q, &eprec);
2772 		if (eprec > prec)
2773 			return false;
2774 	}
2775 
2776 	/* Evict if needed */
2777 	if (eprec >= 0) {
2778 		/* Detect queueing to unconfigured precedence */
2779 		if (eprec == prec)
2780 			return false;	/* refuse newer (incoming) packet */
2781 		/* Evict packet according to discard policy */
2782 		p = brcmu_pktq_pdeq_tail(q, eprec);
2783 		if (p == NULL)
2784 			brcmf_err("brcmu_pktq_pdeq_tail() failed\n");
2785 		brcmu_pkt_buf_free_skb(p);
2786 	}
2787 
2788 	/* Enqueue */
2789 	p = brcmu_pktq_penq(q, prec, pkt);
2790 	if (p == NULL)
2791 		brcmf_err("brcmu_pktq_penq() failed\n");
2792 
2793 	return p != NULL;
2794 }
2795 
2796 static int brcmf_sdio_bus_txdata(struct device *dev, struct sk_buff *pkt)
2797 {
2798 	int ret = -EBADE;
2799 	uint prec;
2800 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
2801 	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
2802 	struct brcmf_sdio *bus = sdiodev->bus;
2803 
2804 	brcmf_dbg(TRACE, "Enter: pkt: data %p len %d\n", pkt->data, pkt->len);
2805 	if (sdiodev->state != BRCMF_SDIOD_DATA)
2806 		return -EIO;
2807 
2808 	/* Add space for the header */
2809 	skb_push(pkt, bus->tx_hdrlen);
2810 	/* precondition: IS_ALIGNED((unsigned long)(pkt->data), 2) */
2811 
2812 	/* In WLAN, priority is always set by the AP using WMM parameters
2813 	 * and this need not always follow the standard 802.1d priority.
2814 	 * Based on AP WMM config, map from 802.1d priority to corresponding
2815 	 * precedence level.
2816 	 */
2817 	prec = brcmf_map_prio_to_prec(bus_if->drvr->config,
2818 				      (pkt->priority & PRIOMASK));
2819 
2820 	/* Check for existing queue, current flow-control,
2821 			 pending event, or pending clock */
2822 	brcmf_dbg(TRACE, "deferring pktq len %d\n", pktq_len(&bus->txq));
2823 	bus->sdcnt.fcqueued++;
2824 
2825 	/* Priority based enq */
2826 	spin_lock_bh(&bus->txq_lock);
2827 	/* reset bus_flags in packet cb */
2828 	*(u16 *)(pkt->cb) = 0;
2829 	if (!brcmf_sdio_prec_enq(&bus->txq, pkt, prec)) {
2830 		skb_pull(pkt, bus->tx_hdrlen);
2831 		brcmf_err("out of bus->txq !!!\n");
2832 		ret = -ENOSR;
2833 	} else {
2834 		ret = 0;
2835 	}
2836 
2837 	if (pktq_len(&bus->txq) >= TXHI) {
2838 		bus->txoff = true;
2839 		brcmf_proto_bcdc_txflowblock(dev, true);
2840 	}
2841 	spin_unlock_bh(&bus->txq_lock);
2842 
2843 #ifdef DEBUG
2844 	if (pktq_plen(&bus->txq, prec) > qcount[prec])
2845 		qcount[prec] = pktq_plen(&bus->txq, prec);
2846 #endif
2847 
2848 	brcmf_sdio_trigger_dpc(bus);
2849 	return ret;
2850 }
2851 
2852 #ifdef DEBUG
2853 #define CONSOLE_LINE_MAX	192
2854 
2855 static int brcmf_sdio_readconsole(struct brcmf_sdio *bus)
2856 {
2857 	struct brcmf_console *c = &bus->console;
2858 	u8 line[CONSOLE_LINE_MAX], ch;
2859 	u32 n, idx, addr;
2860 	int rv;
2861 
2862 	/* Don't do anything until FWREADY updates console address */
2863 	if (bus->console_addr == 0)
2864 		return 0;
2865 
2866 	/* Read console log struct */
2867 	addr = bus->console_addr + offsetof(struct rte_console, log_le);
2868 	rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr, (u8 *)&c->log_le,
2869 			       sizeof(c->log_le));
2870 	if (rv < 0)
2871 		return rv;
2872 
2873 	/* Allocate console buffer (one time only) */
2874 	if (c->buf == NULL) {
2875 		c->bufsize = le32_to_cpu(c->log_le.buf_size);
2876 		c->buf = kmalloc(c->bufsize, GFP_ATOMIC);
2877 		if (c->buf == NULL)
2878 			return -ENOMEM;
2879 	}
2880 
2881 	idx = le32_to_cpu(c->log_le.idx);
2882 
2883 	/* Protect against corrupt value */
2884 	if (idx > c->bufsize)
2885 		return -EBADE;
2886 
2887 	/* Skip reading the console buffer if the index pointer
2888 	 has not moved */
2889 	if (idx == c->last)
2890 		return 0;
2891 
2892 	/* Read the console buffer */
2893 	addr = le32_to_cpu(c->log_le.buf);
2894 	rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr, c->buf, c->bufsize);
2895 	if (rv < 0)
2896 		return rv;
2897 
2898 	while (c->last != idx) {
2899 		for (n = 0; n < CONSOLE_LINE_MAX - 2; n++) {
2900 			if (c->last == idx) {
2901 				/* This would output a partial line.
2902 				 * Instead, back up
2903 				 * the buffer pointer and output this
2904 				 * line next time around.
2905 				 */
2906 				if (c->last >= n)
2907 					c->last -= n;
2908 				else
2909 					c->last = c->bufsize - n;
2910 				goto break2;
2911 			}
2912 			ch = c->buf[c->last];
2913 			c->last = (c->last + 1) % c->bufsize;
2914 			if (ch == '\n')
2915 				break;
2916 			line[n] = ch;
2917 		}
2918 
2919 		if (n > 0) {
2920 			if (line[n - 1] == '\r')
2921 				n--;
2922 			line[n] = 0;
2923 			pr_debug("CONSOLE: %s\n", line);
2924 		}
2925 	}
2926 break2:
2927 
2928 	return 0;
2929 }
2930 #endif				/* DEBUG */
2931 
2932 static int
2933 brcmf_sdio_bus_txctl(struct device *dev, unsigned char *msg, uint msglen)
2934 {
2935 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
2936 	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
2937 	struct brcmf_sdio *bus = sdiodev->bus;
2938 	int ret;
2939 
2940 	brcmf_dbg(TRACE, "Enter\n");
2941 	if (sdiodev->state != BRCMF_SDIOD_DATA)
2942 		return -EIO;
2943 
2944 	/* Send from dpc */
2945 	bus->ctrl_frame_buf = msg;
2946 	bus->ctrl_frame_len = msglen;
2947 	wmb();
2948 	bus->ctrl_frame_stat = true;
2949 
2950 	brcmf_sdio_trigger_dpc(bus);
2951 	wait_event_interruptible_timeout(bus->ctrl_wait, !bus->ctrl_frame_stat,
2952 					 CTL_DONE_TIMEOUT);
2953 	ret = 0;
2954 	if (bus->ctrl_frame_stat) {
2955 		sdio_claim_host(bus->sdiodev->func1);
2956 		if (bus->ctrl_frame_stat) {
2957 			brcmf_dbg(SDIO, "ctrl_frame timeout\n");
2958 			bus->ctrl_frame_stat = false;
2959 			ret = -ETIMEDOUT;
2960 		}
2961 		sdio_release_host(bus->sdiodev->func1);
2962 	}
2963 	if (!ret) {
2964 		brcmf_dbg(SDIO, "ctrl_frame complete, err=%d\n",
2965 			  bus->ctrl_frame_err);
2966 		rmb();
2967 		ret = bus->ctrl_frame_err;
2968 	}
2969 
2970 	if (ret)
2971 		bus->sdcnt.tx_ctlerrs++;
2972 	else
2973 		bus->sdcnt.tx_ctlpkts++;
2974 
2975 	return ret;
2976 }
2977 
2978 #ifdef DEBUG
2979 static int brcmf_sdio_dump_console(struct seq_file *seq, struct brcmf_sdio *bus,
2980 				   struct sdpcm_shared *sh)
2981 {
2982 	u32 addr, console_ptr, console_size, console_index;
2983 	char *conbuf = NULL;
2984 	__le32 sh_val;
2985 	int rv;
2986 
2987 	/* obtain console information from device memory */
2988 	addr = sh->console_addr + offsetof(struct rte_console, log_le);
2989 	rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr,
2990 			       (u8 *)&sh_val, sizeof(u32));
2991 	if (rv < 0)
2992 		return rv;
2993 	console_ptr = le32_to_cpu(sh_val);
2994 
2995 	addr = sh->console_addr + offsetof(struct rte_console, log_le.buf_size);
2996 	rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr,
2997 			       (u8 *)&sh_val, sizeof(u32));
2998 	if (rv < 0)
2999 		return rv;
3000 	console_size = le32_to_cpu(sh_val);
3001 
3002 	addr = sh->console_addr + offsetof(struct rte_console, log_le.idx);
3003 	rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr,
3004 			       (u8 *)&sh_val, sizeof(u32));
3005 	if (rv < 0)
3006 		return rv;
3007 	console_index = le32_to_cpu(sh_val);
3008 
3009 	/* allocate buffer for console data */
3010 	if (console_size <= CONSOLE_BUFFER_MAX)
3011 		conbuf = vzalloc(console_size+1);
3012 
3013 	if (!conbuf)
3014 		return -ENOMEM;
3015 
3016 	/* obtain the console data from device */
3017 	conbuf[console_size] = '\0';
3018 	rv = brcmf_sdiod_ramrw(bus->sdiodev, false, console_ptr, (u8 *)conbuf,
3019 			       console_size);
3020 	if (rv < 0)
3021 		goto done;
3022 
3023 	rv = seq_write(seq, conbuf + console_index,
3024 		       console_size - console_index);
3025 	if (rv < 0)
3026 		goto done;
3027 
3028 	if (console_index > 0)
3029 		rv = seq_write(seq, conbuf, console_index - 1);
3030 
3031 done:
3032 	vfree(conbuf);
3033 	return rv;
3034 }
3035 
3036 static int brcmf_sdio_trap_info(struct seq_file *seq, struct brcmf_sdio *bus,
3037 				struct sdpcm_shared *sh)
3038 {
3039 	int error;
3040 	struct brcmf_trap_info tr;
3041 
3042 	if ((sh->flags & SDPCM_SHARED_TRAP) == 0) {
3043 		brcmf_dbg(INFO, "no trap in firmware\n");
3044 		return 0;
3045 	}
3046 
3047 	error = brcmf_sdiod_ramrw(bus->sdiodev, false, sh->trap_addr, (u8 *)&tr,
3048 				  sizeof(struct brcmf_trap_info));
3049 	if (error < 0)
3050 		return error;
3051 
3052 	if (seq)
3053 		seq_printf(seq,
3054 			   "dongle trap info: type 0x%x @ epc 0x%08x\n"
3055 			   "  cpsr 0x%08x spsr 0x%08x sp 0x%08x\n"
3056 			   "  lr   0x%08x pc   0x%08x offset 0x%x\n"
3057 			   "  r0   0x%08x r1   0x%08x r2 0x%08x r3 0x%08x\n"
3058 			   "  r4   0x%08x r5   0x%08x r6 0x%08x r7 0x%08x\n",
3059 			   le32_to_cpu(tr.type), le32_to_cpu(tr.epc),
3060 			   le32_to_cpu(tr.cpsr), le32_to_cpu(tr.spsr),
3061 			   le32_to_cpu(tr.r13), le32_to_cpu(tr.r14),
3062 			   le32_to_cpu(tr.pc), sh->trap_addr,
3063 			   le32_to_cpu(tr.r0), le32_to_cpu(tr.r1),
3064 			   le32_to_cpu(tr.r2), le32_to_cpu(tr.r3),
3065 			   le32_to_cpu(tr.r4), le32_to_cpu(tr.r5),
3066 			   le32_to_cpu(tr.r6), le32_to_cpu(tr.r7));
3067 	else
3068 		pr_debug("dongle trap info: type 0x%x @ epc 0x%08x\n"
3069 			 "  cpsr 0x%08x spsr 0x%08x sp 0x%08x\n"
3070 			 "  lr   0x%08x pc   0x%08x offset 0x%x\n"
3071 			 "  r0   0x%08x r1   0x%08x r2 0x%08x r3 0x%08x\n"
3072 			 "  r4   0x%08x r5   0x%08x r6 0x%08x r7 0x%08x\n",
3073 			 le32_to_cpu(tr.type), le32_to_cpu(tr.epc),
3074 			 le32_to_cpu(tr.cpsr), le32_to_cpu(tr.spsr),
3075 			 le32_to_cpu(tr.r13), le32_to_cpu(tr.r14),
3076 			 le32_to_cpu(tr.pc), sh->trap_addr,
3077 			 le32_to_cpu(tr.r0), le32_to_cpu(tr.r1),
3078 			 le32_to_cpu(tr.r2), le32_to_cpu(tr.r3),
3079 			 le32_to_cpu(tr.r4), le32_to_cpu(tr.r5),
3080 			 le32_to_cpu(tr.r6), le32_to_cpu(tr.r7));
3081 	return 0;
3082 }
3083 
3084 static int brcmf_sdio_assert_info(struct seq_file *seq, struct brcmf_sdio *bus,
3085 				  struct sdpcm_shared *sh)
3086 {
3087 	int error = 0;
3088 	char file[80] = "?";
3089 	char expr[80] = "<???>";
3090 
3091 	if ((sh->flags & SDPCM_SHARED_ASSERT_BUILT) == 0) {
3092 		brcmf_dbg(INFO, "firmware not built with -assert\n");
3093 		return 0;
3094 	} else if ((sh->flags & SDPCM_SHARED_ASSERT) == 0) {
3095 		brcmf_dbg(INFO, "no assert in dongle\n");
3096 		return 0;
3097 	}
3098 
3099 	sdio_claim_host(bus->sdiodev->func1);
3100 	if (sh->assert_file_addr != 0) {
3101 		error = brcmf_sdiod_ramrw(bus->sdiodev, false,
3102 					  sh->assert_file_addr, (u8 *)file, 80);
3103 		if (error < 0)
3104 			return error;
3105 	}
3106 	if (sh->assert_exp_addr != 0) {
3107 		error = brcmf_sdiod_ramrw(bus->sdiodev, false,
3108 					  sh->assert_exp_addr, (u8 *)expr, 80);
3109 		if (error < 0)
3110 			return error;
3111 	}
3112 	sdio_release_host(bus->sdiodev->func1);
3113 
3114 	seq_printf(seq, "dongle assert: %s:%d: assert(%s)\n",
3115 		   file, sh->assert_line, expr);
3116 	return 0;
3117 }
3118 
3119 static int brcmf_sdio_checkdied(struct brcmf_sdio *bus)
3120 {
3121 	int error;
3122 	struct sdpcm_shared sh;
3123 
3124 	error = brcmf_sdio_readshared(bus, &sh);
3125 
3126 	if (error < 0)
3127 		return error;
3128 
3129 	if ((sh.flags & SDPCM_SHARED_ASSERT_BUILT) == 0)
3130 		brcmf_dbg(INFO, "firmware not built with -assert\n");
3131 	else if (sh.flags & SDPCM_SHARED_ASSERT)
3132 		brcmf_err("assertion in dongle\n");
3133 
3134 	if (sh.flags & SDPCM_SHARED_TRAP) {
3135 		brcmf_err("firmware trap in dongle\n");
3136 		brcmf_sdio_trap_info(NULL, bus, &sh);
3137 	}
3138 
3139 	return 0;
3140 }
3141 
3142 static int brcmf_sdio_died_dump(struct seq_file *seq, struct brcmf_sdio *bus)
3143 {
3144 	int error = 0;
3145 	struct sdpcm_shared sh;
3146 
3147 	error = brcmf_sdio_readshared(bus, &sh);
3148 	if (error < 0)
3149 		goto done;
3150 
3151 	error = brcmf_sdio_assert_info(seq, bus, &sh);
3152 	if (error < 0)
3153 		goto done;
3154 
3155 	error = brcmf_sdio_trap_info(seq, bus, &sh);
3156 	if (error < 0)
3157 		goto done;
3158 
3159 	error = brcmf_sdio_dump_console(seq, bus, &sh);
3160 
3161 done:
3162 	return error;
3163 }
3164 
3165 static int brcmf_sdio_forensic_read(struct seq_file *seq, void *data)
3166 {
3167 	struct brcmf_bus *bus_if = dev_get_drvdata(seq->private);
3168 	struct brcmf_sdio *bus = bus_if->bus_priv.sdio->bus;
3169 
3170 	return brcmf_sdio_died_dump(seq, bus);
3171 }
3172 
3173 static int brcmf_debugfs_sdio_count_read(struct seq_file *seq, void *data)
3174 {
3175 	struct brcmf_bus *bus_if = dev_get_drvdata(seq->private);
3176 	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
3177 	struct brcmf_sdio_count *sdcnt = &sdiodev->bus->sdcnt;
3178 
3179 	seq_printf(seq,
3180 		   "intrcount:    %u\nlastintrs:    %u\n"
3181 		   "pollcnt:      %u\nregfails:     %u\n"
3182 		   "tx_sderrs:    %u\nfcqueued:     %u\n"
3183 		   "rxrtx:        %u\nrx_toolong:   %u\n"
3184 		   "rxc_errors:   %u\nrx_hdrfail:   %u\n"
3185 		   "rx_badhdr:    %u\nrx_badseq:    %u\n"
3186 		   "fc_rcvd:      %u\nfc_xoff:      %u\n"
3187 		   "fc_xon:       %u\nrxglomfail:   %u\n"
3188 		   "rxglomframes: %u\nrxglompkts:   %u\n"
3189 		   "f2rxhdrs:     %u\nf2rxdata:     %u\n"
3190 		   "f2txdata:     %u\nf1regdata:    %u\n"
3191 		   "tickcnt:      %u\ntx_ctlerrs:   %lu\n"
3192 		   "tx_ctlpkts:   %lu\nrx_ctlerrs:   %lu\n"
3193 		   "rx_ctlpkts:   %lu\nrx_readahead: %lu\n",
3194 		   sdcnt->intrcount, sdcnt->lastintrs,
3195 		   sdcnt->pollcnt, sdcnt->regfails,
3196 		   sdcnt->tx_sderrs, sdcnt->fcqueued,
3197 		   sdcnt->rxrtx, sdcnt->rx_toolong,
3198 		   sdcnt->rxc_errors, sdcnt->rx_hdrfail,
3199 		   sdcnt->rx_badhdr, sdcnt->rx_badseq,
3200 		   sdcnt->fc_rcvd, sdcnt->fc_xoff,
3201 		   sdcnt->fc_xon, sdcnt->rxglomfail,
3202 		   sdcnt->rxglomframes, sdcnt->rxglompkts,
3203 		   sdcnt->f2rxhdrs, sdcnt->f2rxdata,
3204 		   sdcnt->f2txdata, sdcnt->f1regdata,
3205 		   sdcnt->tickcnt, sdcnt->tx_ctlerrs,
3206 		   sdcnt->tx_ctlpkts, sdcnt->rx_ctlerrs,
3207 		   sdcnt->rx_ctlpkts, sdcnt->rx_readahead_cnt);
3208 
3209 	return 0;
3210 }
3211 
3212 static void brcmf_sdio_debugfs_create(struct device *dev)
3213 {
3214 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
3215 	struct brcmf_pub *drvr = bus_if->drvr;
3216 	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
3217 	struct brcmf_sdio *bus = sdiodev->bus;
3218 	struct dentry *dentry = brcmf_debugfs_get_devdir(drvr);
3219 
3220 	if (IS_ERR_OR_NULL(dentry))
3221 		return;
3222 
3223 	bus->console_interval = BRCMF_CONSOLE;
3224 
3225 	brcmf_debugfs_add_entry(drvr, "forensics", brcmf_sdio_forensic_read);
3226 	brcmf_debugfs_add_entry(drvr, "counters",
3227 				brcmf_debugfs_sdio_count_read);
3228 	debugfs_create_u32("console_interval", 0644, dentry,
3229 			   &bus->console_interval);
3230 }
3231 #else
3232 static int brcmf_sdio_checkdied(struct brcmf_sdio *bus)
3233 {
3234 	return 0;
3235 }
3236 
3237 static void brcmf_sdio_debugfs_create(struct device *dev)
3238 {
3239 }
3240 #endif /* DEBUG */
3241 
3242 static int
3243 brcmf_sdio_bus_rxctl(struct device *dev, unsigned char *msg, uint msglen)
3244 {
3245 	int timeleft;
3246 	uint rxlen = 0;
3247 	bool pending;
3248 	u8 *buf;
3249 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
3250 	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
3251 	struct brcmf_sdio *bus = sdiodev->bus;
3252 
3253 	brcmf_dbg(TRACE, "Enter\n");
3254 	if (sdiodev->state != BRCMF_SDIOD_DATA)
3255 		return -EIO;
3256 
3257 	/* Wait until control frame is available */
3258 	timeleft = brcmf_sdio_dcmd_resp_wait(bus, &bus->rxlen, &pending);
3259 
3260 	spin_lock_bh(&bus->rxctl_lock);
3261 	rxlen = bus->rxlen;
3262 	memcpy(msg, bus->rxctl, min(msglen, rxlen));
3263 	bus->rxctl = NULL;
3264 	buf = bus->rxctl_orig;
3265 	bus->rxctl_orig = NULL;
3266 	bus->rxlen = 0;
3267 	spin_unlock_bh(&bus->rxctl_lock);
3268 	vfree(buf);
3269 
3270 	if (rxlen) {
3271 		brcmf_dbg(CTL, "resumed on rxctl frame, got %d expected %d\n",
3272 			  rxlen, msglen);
3273 	} else if (timeleft == 0) {
3274 		brcmf_err("resumed on timeout\n");
3275 		brcmf_sdio_checkdied(bus);
3276 	} else if (pending) {
3277 		brcmf_dbg(CTL, "cancelled\n");
3278 		return -ERESTARTSYS;
3279 	} else {
3280 		brcmf_dbg(CTL, "resumed for unknown reason?\n");
3281 		brcmf_sdio_checkdied(bus);
3282 	}
3283 
3284 	if (rxlen)
3285 		bus->sdcnt.rx_ctlpkts++;
3286 	else
3287 		bus->sdcnt.rx_ctlerrs++;
3288 
3289 	return rxlen ? (int)rxlen : -ETIMEDOUT;
3290 }
3291 
3292 #ifdef DEBUG
3293 static bool
3294 brcmf_sdio_verifymemory(struct brcmf_sdio_dev *sdiodev, u32 ram_addr,
3295 			u8 *ram_data, uint ram_sz)
3296 {
3297 	char *ram_cmp;
3298 	int err;
3299 	bool ret = true;
3300 	int address;
3301 	int offset;
3302 	int len;
3303 
3304 	/* read back and verify */
3305 	brcmf_dbg(INFO, "Compare RAM dl & ul at 0x%08x; size=%d\n", ram_addr,
3306 		  ram_sz);
3307 	ram_cmp = kmalloc(MEMBLOCK, GFP_KERNEL);
3308 	/* do not proceed while no memory but  */
3309 	if (!ram_cmp)
3310 		return true;
3311 
3312 	address = ram_addr;
3313 	offset = 0;
3314 	while (offset < ram_sz) {
3315 		len = ((offset + MEMBLOCK) < ram_sz) ? MEMBLOCK :
3316 		      ram_sz - offset;
3317 		err = brcmf_sdiod_ramrw(sdiodev, false, address, ram_cmp, len);
3318 		if (err) {
3319 			brcmf_err("error %d on reading %d membytes at 0x%08x\n",
3320 				  err, len, address);
3321 			ret = false;
3322 			break;
3323 		} else if (memcmp(ram_cmp, &ram_data[offset], len)) {
3324 			brcmf_err("Downloaded RAM image is corrupted, block offset is %d, len is %d\n",
3325 				  offset, len);
3326 			ret = false;
3327 			break;
3328 		}
3329 		offset += len;
3330 		address += len;
3331 	}
3332 
3333 	kfree(ram_cmp);
3334 
3335 	return ret;
3336 }
3337 #else	/* DEBUG */
3338 static bool
3339 brcmf_sdio_verifymemory(struct brcmf_sdio_dev *sdiodev, u32 ram_addr,
3340 			u8 *ram_data, uint ram_sz)
3341 {
3342 	return true;
3343 }
3344 #endif	/* DEBUG */
3345 
3346 static int brcmf_sdio_download_code_file(struct brcmf_sdio *bus,
3347 					 const struct firmware *fw)
3348 {
3349 	int err;
3350 
3351 	brcmf_dbg(TRACE, "Enter\n");
3352 
3353 	err = brcmf_sdiod_ramrw(bus->sdiodev, true, bus->ci->rambase,
3354 				(u8 *)fw->data, fw->size);
3355 	if (err)
3356 		brcmf_err("error %d on writing %d membytes at 0x%08x\n",
3357 			  err, (int)fw->size, bus->ci->rambase);
3358 	else if (!brcmf_sdio_verifymemory(bus->sdiodev, bus->ci->rambase,
3359 					  (u8 *)fw->data, fw->size))
3360 		err = -EIO;
3361 
3362 	return err;
3363 }
3364 
3365 static int brcmf_sdio_download_nvram(struct brcmf_sdio *bus,
3366 				     void *vars, u32 varsz)
3367 {
3368 	int address;
3369 	int err;
3370 
3371 	brcmf_dbg(TRACE, "Enter\n");
3372 
3373 	address = bus->ci->ramsize - varsz + bus->ci->rambase;
3374 	err = brcmf_sdiod_ramrw(bus->sdiodev, true, address, vars, varsz);
3375 	if (err)
3376 		brcmf_err("error %d on writing %d nvram bytes at 0x%08x\n",
3377 			  err, varsz, address);
3378 	else if (!brcmf_sdio_verifymemory(bus->sdiodev, address, vars, varsz))
3379 		err = -EIO;
3380 
3381 	return err;
3382 }
3383 
3384 static int brcmf_sdio_download_firmware(struct brcmf_sdio *bus,
3385 					const struct firmware *fw,
3386 					void *nvram, u32 nvlen)
3387 {
3388 	int bcmerror;
3389 	u32 rstvec;
3390 
3391 	sdio_claim_host(bus->sdiodev->func1);
3392 	brcmf_sdio_clkctl(bus, CLK_AVAIL, false);
3393 
3394 	rstvec = get_unaligned_le32(fw->data);
3395 	brcmf_dbg(SDIO, "firmware rstvec: %x\n", rstvec);
3396 
3397 	bcmerror = brcmf_sdio_download_code_file(bus, fw);
3398 	release_firmware(fw);
3399 	if (bcmerror) {
3400 		brcmf_err("dongle image file download failed\n");
3401 		brcmf_fw_nvram_free(nvram);
3402 		goto err;
3403 	}
3404 
3405 	bcmerror = brcmf_sdio_download_nvram(bus, nvram, nvlen);
3406 	brcmf_fw_nvram_free(nvram);
3407 	if (bcmerror) {
3408 		brcmf_err("dongle nvram file download failed\n");
3409 		goto err;
3410 	}
3411 
3412 	/* Take arm out of reset */
3413 	if (!brcmf_chip_set_active(bus->ci, rstvec)) {
3414 		brcmf_err("error getting out of ARM core reset\n");
3415 		bcmerror = -EIO;
3416 		goto err;
3417 	}
3418 
3419 err:
3420 	brcmf_sdio_clkctl(bus, CLK_SDONLY, false);
3421 	sdio_release_host(bus->sdiodev->func1);
3422 	return bcmerror;
3423 }
3424 
3425 static bool brcmf_sdio_aos_no_decode(struct brcmf_sdio *bus)
3426 {
3427 	if (bus->ci->chip == CY_CC_43012_CHIP_ID ||
3428 	    bus->ci->chip == CY_CC_43752_CHIP_ID)
3429 		return true;
3430 	else
3431 		return false;
3432 }
3433 
3434 static void brcmf_sdio_sr_init(struct brcmf_sdio *bus)
3435 {
3436 	int err = 0;
3437 	u8 val;
3438 	u8 wakeupctrl;
3439 	u8 cardcap;
3440 	u8 chipclkcsr;
3441 
3442 	brcmf_dbg(TRACE, "Enter\n");
3443 
3444 	if (brcmf_chip_is_ulp(bus->ci)) {
3445 		wakeupctrl = SBSDIO_FUNC1_WCTRL_ALPWAIT_SHIFT;
3446 		chipclkcsr = SBSDIO_HT_AVAIL_REQ;
3447 	} else {
3448 		wakeupctrl = SBSDIO_FUNC1_WCTRL_HTWAIT_SHIFT;
3449 		chipclkcsr = SBSDIO_FORCE_HT;
3450 	}
3451 
3452 	if (brcmf_sdio_aos_no_decode(bus)) {
3453 		cardcap = SDIO_CCCR_BRCM_CARDCAP_CMD_NODEC;
3454 	} else {
3455 		cardcap = (SDIO_CCCR_BRCM_CARDCAP_CMD14_SUPPORT |
3456 			   SDIO_CCCR_BRCM_CARDCAP_CMD14_EXT);
3457 	}
3458 
3459 	val = brcmf_sdiod_readb(bus->sdiodev, SBSDIO_FUNC1_WAKEUPCTRL, &err);
3460 	if (err) {
3461 		brcmf_err("error reading SBSDIO_FUNC1_WAKEUPCTRL\n");
3462 		return;
3463 	}
3464 	val |= 1 << wakeupctrl;
3465 	brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_FUNC1_WAKEUPCTRL, val, &err);
3466 	if (err) {
3467 		brcmf_err("error writing SBSDIO_FUNC1_WAKEUPCTRL\n");
3468 		return;
3469 	}
3470 
3471 	/* Add CMD14 Support */
3472 	brcmf_sdiod_func0_wb(bus->sdiodev, SDIO_CCCR_BRCM_CARDCAP,
3473 			     cardcap,
3474 			     &err);
3475 	if (err) {
3476 		brcmf_err("error writing SDIO_CCCR_BRCM_CARDCAP\n");
3477 		return;
3478 	}
3479 
3480 	brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
3481 			   chipclkcsr, &err);
3482 	if (err) {
3483 		brcmf_err("error writing SBSDIO_FUNC1_CHIPCLKCSR\n");
3484 		return;
3485 	}
3486 
3487 	/* set flag */
3488 	bus->sr_enabled = true;
3489 	brcmf_dbg(INFO, "SR enabled\n");
3490 }
3491 
3492 /* enable KSO bit */
3493 static int brcmf_sdio_kso_init(struct brcmf_sdio *bus)
3494 {
3495 	struct brcmf_core *core = bus->sdio_core;
3496 	u8 val;
3497 	int err = 0;
3498 
3499 	brcmf_dbg(TRACE, "Enter\n");
3500 
3501 	/* KSO bit added in SDIO core rev 12 */
3502 	if (core->rev < 12)
3503 		return 0;
3504 
3505 	val = brcmf_sdiod_readb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR, &err);
3506 	if (err) {
3507 		brcmf_err("error reading SBSDIO_FUNC1_SLEEPCSR\n");
3508 		return err;
3509 	}
3510 
3511 	if (!(val & SBSDIO_FUNC1_SLEEPCSR_KSO_MASK)) {
3512 		val |= (SBSDIO_FUNC1_SLEEPCSR_KSO_EN <<
3513 			SBSDIO_FUNC1_SLEEPCSR_KSO_SHIFT);
3514 		brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR,
3515 				   val, &err);
3516 		if (err) {
3517 			brcmf_err("error writing SBSDIO_FUNC1_SLEEPCSR\n");
3518 			return err;
3519 		}
3520 	}
3521 
3522 	return 0;
3523 }
3524 
3525 
3526 static int brcmf_sdio_bus_preinit(struct device *dev)
3527 {
3528 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
3529 	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
3530 	struct brcmf_sdio *bus = sdiodev->bus;
3531 	struct brcmf_core *core = bus->sdio_core;
3532 	u32 value;
3533 	__le32 iovar;
3534 	int err;
3535 
3536 	/* maxctl provided by common layer */
3537 	if (WARN_ON(!bus_if->maxctl))
3538 		return -EINVAL;
3539 
3540 	/* Allocate control receive buffer */
3541 	bus_if->maxctl += bus->roundup;
3542 	value = roundup((bus_if->maxctl + SDPCM_HDRLEN), ALIGNMENT);
3543 	value += bus->head_align;
3544 	bus->rxbuf = kmalloc(value, GFP_ATOMIC);
3545 	if (bus->rxbuf)
3546 		bus->rxblen = value;
3547 
3548 	/* the commands below use the terms tx and rx from
3549 	 * a device perspective, ie. bus:txglom affects the
3550 	 * bus transfers from device to host.
3551 	 */
3552 	if (core->rev < 12) {
3553 		/* for sdio core rev < 12, disable txgloming */
3554 		iovar = 0;
3555 		err = brcmf_iovar_data_set(dev, "bus:txglom", &iovar,
3556 					   sizeof(iovar));
3557 	} else {
3558 		/* otherwise, set txglomalign */
3559 		value = sdiodev->settings->bus.sdio.sd_sgentry_align;
3560 		/* SDIO ADMA requires at least 32 bit alignment */
3561 		iovar = cpu_to_le32(max_t(u32, value, ALIGNMENT));
3562 		err = brcmf_iovar_data_set(dev, "bus:txglomalign", &iovar,
3563 					   sizeof(iovar));
3564 	}
3565 
3566 	if (err < 0)
3567 		goto done;
3568 
3569 	bus->tx_hdrlen = SDPCM_HWHDR_LEN + SDPCM_SWHDR_LEN;
3570 	if (sdiodev->sg_support) {
3571 		bus->txglom = false;
3572 		iovar = cpu_to_le32(1);
3573 		err = brcmf_iovar_data_set(bus->sdiodev->dev, "bus:rxglom",
3574 					   &iovar, sizeof(iovar));
3575 		if (err < 0) {
3576 			/* bus:rxglom is allowed to fail */
3577 			err = 0;
3578 		} else {
3579 			bus->txglom = true;
3580 			bus->tx_hdrlen += SDPCM_HWEXT_LEN;
3581 		}
3582 	}
3583 	brcmf_bus_add_txhdrlen(bus->sdiodev->dev, bus->tx_hdrlen);
3584 
3585 done:
3586 	return err;
3587 }
3588 
3589 static size_t brcmf_sdio_bus_get_ramsize(struct device *dev)
3590 {
3591 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
3592 	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
3593 	struct brcmf_sdio *bus = sdiodev->bus;
3594 
3595 	return bus->ci->ramsize - bus->ci->srsize;
3596 }
3597 
3598 static int brcmf_sdio_bus_get_memdump(struct device *dev, void *data,
3599 				      size_t mem_size)
3600 {
3601 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
3602 	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
3603 	struct brcmf_sdio *bus = sdiodev->bus;
3604 	int err;
3605 	int address;
3606 	int offset;
3607 	int len;
3608 
3609 	brcmf_dbg(INFO, "dump at 0x%08x: size=%zu\n", bus->ci->rambase,
3610 		  mem_size);
3611 
3612 	address = bus->ci->rambase;
3613 	offset = err = 0;
3614 	sdio_claim_host(sdiodev->func1);
3615 	while (offset < mem_size) {
3616 		len = ((offset + MEMBLOCK) < mem_size) ? MEMBLOCK :
3617 		      mem_size - offset;
3618 		err = brcmf_sdiod_ramrw(sdiodev, false, address, data, len);
3619 		if (err) {
3620 			brcmf_err("error %d on reading %d membytes at 0x%08x\n",
3621 				  err, len, address);
3622 			goto done;
3623 		}
3624 		data += len;
3625 		offset += len;
3626 		address += len;
3627 	}
3628 
3629 done:
3630 	sdio_release_host(sdiodev->func1);
3631 	return err;
3632 }
3633 
3634 void brcmf_sdio_trigger_dpc(struct brcmf_sdio *bus)
3635 {
3636 	if (!bus->dpc_triggered) {
3637 		bus->dpc_triggered = true;
3638 		queue_work(bus->brcmf_wq, &bus->datawork);
3639 	}
3640 }
3641 
3642 void brcmf_sdio_isr(struct brcmf_sdio *bus, bool in_isr)
3643 {
3644 	brcmf_dbg(TRACE, "Enter\n");
3645 
3646 	if (!bus) {
3647 		brcmf_err("bus is null pointer, exiting\n");
3648 		return;
3649 	}
3650 
3651 	/* Count the interrupt call */
3652 	bus->sdcnt.intrcount++;
3653 	if (in_isr)
3654 		atomic_set(&bus->ipend, 1);
3655 	else
3656 		if (brcmf_sdio_intr_rstatus(bus)) {
3657 			brcmf_err("failed backplane access\n");
3658 		}
3659 
3660 	/* Disable additional interrupts (is this needed now)? */
3661 	if (!bus->intr)
3662 		brcmf_err("isr w/o interrupt configured!\n");
3663 
3664 	bus->dpc_triggered = true;
3665 	queue_work(bus->brcmf_wq, &bus->datawork);
3666 }
3667 
3668 static void brcmf_sdio_bus_watchdog(struct brcmf_sdio *bus)
3669 {
3670 	brcmf_dbg(TIMER, "Enter\n");
3671 
3672 	/* Poll period: check device if appropriate. */
3673 	if (!bus->sr_enabled &&
3674 	    bus->poll && (++bus->polltick >= bus->pollrate)) {
3675 		u32 intstatus = 0;
3676 
3677 		/* Reset poll tick */
3678 		bus->polltick = 0;
3679 
3680 		/* Check device if no interrupts */
3681 		if (!bus->intr ||
3682 		    (bus->sdcnt.intrcount == bus->sdcnt.lastintrs)) {
3683 
3684 			if (!bus->dpc_triggered) {
3685 				u8 devpend;
3686 
3687 				sdio_claim_host(bus->sdiodev->func1);
3688 				devpend = brcmf_sdiod_func0_rb(bus->sdiodev,
3689 						  SDIO_CCCR_INTx, NULL);
3690 				sdio_release_host(bus->sdiodev->func1);
3691 				intstatus = devpend & (INTR_STATUS_FUNC1 |
3692 						       INTR_STATUS_FUNC2);
3693 			}
3694 
3695 			/* If there is something, make like the ISR and
3696 				 schedule the DPC */
3697 			if (intstatus) {
3698 				bus->sdcnt.pollcnt++;
3699 				atomic_set(&bus->ipend, 1);
3700 
3701 				bus->dpc_triggered = true;
3702 				queue_work(bus->brcmf_wq, &bus->datawork);
3703 			}
3704 		}
3705 
3706 		/* Update interrupt tracking */
3707 		bus->sdcnt.lastintrs = bus->sdcnt.intrcount;
3708 	}
3709 #ifdef DEBUG
3710 	/* Poll for console output periodically */
3711 	if (bus->sdiodev->state == BRCMF_SDIOD_DATA && BRCMF_FWCON_ON() &&
3712 	    bus->console_interval != 0) {
3713 		bus->console.count += jiffies_to_msecs(BRCMF_WD_POLL);
3714 		if (bus->console.count >= bus->console_interval) {
3715 			bus->console.count -= bus->console_interval;
3716 			sdio_claim_host(bus->sdiodev->func1);
3717 			/* Make sure backplane clock is on */
3718 			brcmf_sdio_bus_sleep(bus, false, false);
3719 			if (brcmf_sdio_readconsole(bus) < 0)
3720 				/* stop on error */
3721 				bus->console_interval = 0;
3722 			sdio_release_host(bus->sdiodev->func1);
3723 		}
3724 	}
3725 #endif				/* DEBUG */
3726 
3727 	/* On idle timeout clear activity flag and/or turn off clock */
3728 	if (!bus->dpc_triggered) {
3729 		rmb();
3730 		if ((!bus->dpc_running) && (bus->idletime > 0) &&
3731 		    (bus->clkstate == CLK_AVAIL)) {
3732 			bus->idlecount++;
3733 			if (bus->idlecount > bus->idletime) {
3734 				brcmf_dbg(SDIO, "idle\n");
3735 				sdio_claim_host(bus->sdiodev->func1);
3736 #ifdef DEBUG
3737 				if (!BRCMF_FWCON_ON() ||
3738 				    bus->console_interval == 0)
3739 #endif
3740 					brcmf_sdio_wd_timer(bus, false);
3741 				bus->idlecount = 0;
3742 				brcmf_sdio_bus_sleep(bus, true, false);
3743 				sdio_release_host(bus->sdiodev->func1);
3744 			}
3745 		} else {
3746 			bus->idlecount = 0;
3747 		}
3748 	} else {
3749 		bus->idlecount = 0;
3750 	}
3751 }
3752 
3753 static void brcmf_sdio_dataworker(struct work_struct *work)
3754 {
3755 	struct brcmf_sdio *bus = container_of(work, struct brcmf_sdio,
3756 					      datawork);
3757 
3758 	bus->dpc_running = true;
3759 	wmb();
3760 	while (READ_ONCE(bus->dpc_triggered)) {
3761 		bus->dpc_triggered = false;
3762 		brcmf_sdio_dpc(bus);
3763 		bus->idlecount = 0;
3764 	}
3765 	bus->dpc_running = false;
3766 	if (brcmf_sdiod_freezing(bus->sdiodev)) {
3767 		brcmf_sdiod_change_state(bus->sdiodev, BRCMF_SDIOD_DOWN);
3768 		brcmf_sdiod_try_freeze(bus->sdiodev);
3769 		brcmf_sdiod_change_state(bus->sdiodev, BRCMF_SDIOD_DATA);
3770 	}
3771 }
3772 
3773 static void
3774 brcmf_sdio_drivestrengthinit(struct brcmf_sdio_dev *sdiodev,
3775 			     struct brcmf_chip *ci, u32 drivestrength)
3776 {
3777 	const struct sdiod_drive_str *str_tab = NULL;
3778 	u32 str_mask;
3779 	u32 str_shift;
3780 	u32 i;
3781 	u32 drivestrength_sel = 0;
3782 	u32 cc_data_temp;
3783 	u32 addr;
3784 
3785 	if (!(ci->cc_caps & CC_CAP_PMU))
3786 		return;
3787 
3788 	switch (SDIOD_DRVSTR_KEY(ci->chip, ci->pmurev)) {
3789 	case SDIOD_DRVSTR_KEY(BRCM_CC_4330_CHIP_ID, 12):
3790 		str_tab = sdiod_drvstr_tab1_1v8;
3791 		str_mask = 0x00003800;
3792 		str_shift = 11;
3793 		break;
3794 	case SDIOD_DRVSTR_KEY(BRCM_CC_4334_CHIP_ID, 17):
3795 		str_tab = sdiod_drvstr_tab6_1v8;
3796 		str_mask = 0x00001800;
3797 		str_shift = 11;
3798 		break;
3799 	case SDIOD_DRVSTR_KEY(BRCM_CC_43143_CHIP_ID, 17):
3800 		/* note: 43143 does not support tristate */
3801 		i = ARRAY_SIZE(sdiod_drvstr_tab2_3v3) - 1;
3802 		if (drivestrength >= sdiod_drvstr_tab2_3v3[i].strength) {
3803 			str_tab = sdiod_drvstr_tab2_3v3;
3804 			str_mask = 0x00000007;
3805 			str_shift = 0;
3806 		} else
3807 			brcmf_err("Invalid SDIO Drive strength for chip %s, strength=%d\n",
3808 				  ci->name, drivestrength);
3809 		break;
3810 	case SDIOD_DRVSTR_KEY(BRCM_CC_43362_CHIP_ID, 13):
3811 		str_tab = sdiod_drive_strength_tab5_1v8;
3812 		str_mask = 0x00003800;
3813 		str_shift = 11;
3814 		break;
3815 	default:
3816 		brcmf_dbg(INFO, "No SDIO driver strength init needed for chip %s rev %d pmurev %d\n",
3817 			  ci->name, ci->chiprev, ci->pmurev);
3818 		break;
3819 	}
3820 
3821 	if (str_tab != NULL) {
3822 		struct brcmf_core *pmu = brcmf_chip_get_pmu(ci);
3823 
3824 		for (i = 0; str_tab[i].strength != 0; i++) {
3825 			if (drivestrength >= str_tab[i].strength) {
3826 				drivestrength_sel = str_tab[i].sel;
3827 				break;
3828 			}
3829 		}
3830 		addr = CORE_CC_REG(pmu->base, chipcontrol_addr);
3831 		brcmf_sdiod_writel(sdiodev, addr, 1, NULL);
3832 		cc_data_temp = brcmf_sdiod_readl(sdiodev, addr, NULL);
3833 		cc_data_temp &= ~str_mask;
3834 		drivestrength_sel <<= str_shift;
3835 		cc_data_temp |= drivestrength_sel;
3836 		brcmf_sdiod_writel(sdiodev, addr, cc_data_temp, NULL);
3837 
3838 		brcmf_dbg(INFO, "SDIO: %d mA (req=%d mA) drive strength selected, set to 0x%08x\n",
3839 			  str_tab[i].strength, drivestrength, cc_data_temp);
3840 	}
3841 }
3842 
3843 static int brcmf_sdio_buscoreprep(void *ctx)
3844 {
3845 	struct brcmf_sdio_dev *sdiodev = ctx;
3846 	int err = 0;
3847 	u8 clkval, clkset;
3848 
3849 	/* Try forcing SDIO core to do ALPAvail request only */
3850 	clkset = SBSDIO_FORCE_HW_CLKREQ_OFF | SBSDIO_ALP_AVAIL_REQ;
3851 	brcmf_sdiod_writeb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, clkset, &err);
3852 	if (err) {
3853 		brcmf_err("error writing for HT off\n");
3854 		return err;
3855 	}
3856 
3857 	/* If register supported, wait for ALPAvail and then force ALP */
3858 	/* This may take up to 15 milliseconds */
3859 	clkval = brcmf_sdiod_readb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, NULL);
3860 
3861 	if ((clkval & ~SBSDIO_AVBITS) != clkset) {
3862 		brcmf_err("ChipClkCSR access: wrote 0x%02x read 0x%02x\n",
3863 			  clkset, clkval);
3864 		return -EACCES;
3865 	}
3866 
3867 	SPINWAIT(((clkval = brcmf_sdiod_readb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
3868 					      NULL)),
3869 		 !SBSDIO_ALPAV(clkval)),
3870 		 PMU_MAX_TRANSITION_DLY);
3871 
3872 	if (!SBSDIO_ALPAV(clkval)) {
3873 		brcmf_err("timeout on ALPAV wait, clkval 0x%02x\n",
3874 			  clkval);
3875 		return -EBUSY;
3876 	}
3877 
3878 	clkset = SBSDIO_FORCE_HW_CLKREQ_OFF | SBSDIO_FORCE_ALP;
3879 	brcmf_sdiod_writeb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, clkset, &err);
3880 	udelay(65);
3881 
3882 	/* Also, disable the extra SDIO pull-ups */
3883 	brcmf_sdiod_writeb(sdiodev, SBSDIO_FUNC1_SDIOPULLUP, 0, NULL);
3884 
3885 	return 0;
3886 }
3887 
3888 static void brcmf_sdio_buscore_activate(void *ctx, struct brcmf_chip *chip,
3889 					u32 rstvec)
3890 {
3891 	struct brcmf_sdio_dev *sdiodev = ctx;
3892 	struct brcmf_core *core = sdiodev->bus->sdio_core;
3893 	u32 reg_addr;
3894 
3895 	/* clear all interrupts */
3896 	reg_addr = core->base + SD_REG(intstatus);
3897 	brcmf_sdiod_writel(sdiodev, reg_addr, 0xFFFFFFFF, NULL);
3898 
3899 	if (rstvec)
3900 		/* Write reset vector to address 0 */
3901 		brcmf_sdiod_ramrw(sdiodev, true, 0, (void *)&rstvec,
3902 				  sizeof(rstvec));
3903 }
3904 
3905 static u32 brcmf_sdio_buscore_read32(void *ctx, u32 addr)
3906 {
3907 	struct brcmf_sdio_dev *sdiodev = ctx;
3908 	u32 val, rev;
3909 
3910 	val = brcmf_sdiod_readl(sdiodev, addr, NULL);
3911 
3912 	/*
3913 	 * this is a bit of special handling if reading the chipcommon chipid
3914 	 * register. The 4339 is a next-gen of the 4335. It uses the same
3915 	 * SDIO device id as 4335 and the chipid register returns 4335 as well.
3916 	 * It can be identified as 4339 by looking at the chip revision. It
3917 	 * is corrected here so the chip.c module has the right info.
3918 	 */
3919 	if (addr == CORE_CC_REG(SI_ENUM_BASE_DEFAULT, chipid) &&
3920 	    (sdiodev->func1->device == SDIO_DEVICE_ID_BROADCOM_4339 ||
3921 	     sdiodev->func1->device == SDIO_DEVICE_ID_BROADCOM_4335_4339)) {
3922 		rev = (val & CID_REV_MASK) >> CID_REV_SHIFT;
3923 		if (rev >= 2) {
3924 			val &= ~CID_ID_MASK;
3925 			val |= BRCM_CC_4339_CHIP_ID;
3926 		}
3927 	}
3928 
3929 	return val;
3930 }
3931 
3932 static void brcmf_sdio_buscore_write32(void *ctx, u32 addr, u32 val)
3933 {
3934 	struct brcmf_sdio_dev *sdiodev = ctx;
3935 
3936 	brcmf_sdiod_writel(sdiodev, addr, val, NULL);
3937 }
3938 
3939 static const struct brcmf_buscore_ops brcmf_sdio_buscore_ops = {
3940 	.prepare = brcmf_sdio_buscoreprep,
3941 	.activate = brcmf_sdio_buscore_activate,
3942 	.read32 = brcmf_sdio_buscore_read32,
3943 	.write32 = brcmf_sdio_buscore_write32,
3944 };
3945 
3946 static bool
3947 brcmf_sdio_probe_attach(struct brcmf_sdio *bus)
3948 {
3949 	struct brcmf_sdio_dev *sdiodev;
3950 	u8 clkctl = 0;
3951 	int err = 0;
3952 	int reg_addr;
3953 	u32 reg_val;
3954 	u32 drivestrength;
3955 	u32 enum_base;
3956 
3957 	sdiodev = bus->sdiodev;
3958 	sdio_claim_host(sdiodev->func1);
3959 
3960 	enum_base = brcmf_chip_enum_base(sdiodev->func1->device);
3961 
3962 	pr_debug("F1 signature read @0x%08x=0x%4x\n", enum_base,
3963 		 brcmf_sdiod_readl(sdiodev, enum_base, NULL));
3964 
3965 	/*
3966 	 * Force PLL off until brcmf_chip_attach()
3967 	 * programs PLL control regs
3968 	 */
3969 
3970 	brcmf_sdiod_writeb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, BRCMF_INIT_CLKCTL1,
3971 			   &err);
3972 	if (!err)
3973 		clkctl = brcmf_sdiod_readb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
3974 					   &err);
3975 
3976 	if (err || ((clkctl & ~SBSDIO_AVBITS) != BRCMF_INIT_CLKCTL1)) {
3977 		brcmf_err("ChipClkCSR access: err %d wrote 0x%02x read 0x%02x\n",
3978 			  err, BRCMF_INIT_CLKCTL1, clkctl);
3979 		goto fail;
3980 	}
3981 
3982 	bus->ci = brcmf_chip_attach(sdiodev, sdiodev->func1->device,
3983 				    &brcmf_sdio_buscore_ops);
3984 	if (IS_ERR(bus->ci)) {
3985 		brcmf_err("brcmf_chip_attach failed!\n");
3986 		bus->ci = NULL;
3987 		goto fail;
3988 	}
3989 
3990 	/* Pick up the SDIO core info struct from chip.c */
3991 	bus->sdio_core   = brcmf_chip_get_core(bus->ci, BCMA_CORE_SDIO_DEV);
3992 	if (!bus->sdio_core)
3993 		goto fail;
3994 
3995 	/* Pick up the CHIPCOMMON core info struct, for bulk IO in bcmsdh.c */
3996 	sdiodev->cc_core = brcmf_chip_get_core(bus->ci, BCMA_CORE_CHIPCOMMON);
3997 	if (!sdiodev->cc_core)
3998 		goto fail;
3999 
4000 	sdiodev->settings = brcmf_get_module_param(sdiodev->dev,
4001 						   BRCMF_BUSTYPE_SDIO,
4002 						   bus->ci->chip,
4003 						   bus->ci->chiprev);
4004 	if (!sdiodev->settings) {
4005 		brcmf_err("Failed to get device parameters\n");
4006 		goto fail;
4007 	}
4008 	/* platform specific configuration:
4009 	 *   alignments must be at least 4 bytes for ADMA
4010 	 */
4011 	bus->head_align = ALIGNMENT;
4012 	bus->sgentry_align = ALIGNMENT;
4013 	if (sdiodev->settings->bus.sdio.sd_head_align > ALIGNMENT)
4014 		bus->head_align = sdiodev->settings->bus.sdio.sd_head_align;
4015 	if (sdiodev->settings->bus.sdio.sd_sgentry_align > ALIGNMENT)
4016 		bus->sgentry_align =
4017 				sdiodev->settings->bus.sdio.sd_sgentry_align;
4018 
4019 	/* allocate scatter-gather table. sg support
4020 	 * will be disabled upon allocation failure.
4021 	 */
4022 	brcmf_sdiod_sgtable_alloc(sdiodev);
4023 
4024 	/* wowl can be supported when KEEP_POWER is true and (WAKE_SDIO_IRQ
4025 	 * is true or when platform data OOB irq is true).
4026 	 */
4027 	if (IS_ENABLED(CONFIG_PM_SLEEP) &&
4028 	    (sdio_get_host_pm_caps(sdiodev->func1) & MMC_PM_KEEP_POWER) &&
4029 	    ((sdio_get_host_pm_caps(sdiodev->func1) & MMC_PM_WAKE_SDIO_IRQ) ||
4030 	     (sdiodev->settings->bus.sdio.oob_irq_supported)))
4031 		sdiodev->bus_if->wowl_supported = true;
4032 
4033 	if (brcmf_sdio_kso_init(bus)) {
4034 		brcmf_err("error enabling KSO\n");
4035 		goto fail;
4036 	}
4037 
4038 	if (sdiodev->settings->bus.sdio.drive_strength)
4039 		drivestrength = sdiodev->settings->bus.sdio.drive_strength;
4040 	else
4041 		drivestrength = DEFAULT_SDIO_DRIVE_STRENGTH;
4042 	brcmf_sdio_drivestrengthinit(sdiodev, bus->ci, drivestrength);
4043 
4044 	/* Set card control so an SDIO card reset does a WLAN backplane reset */
4045 	reg_val = brcmf_sdiod_func0_rb(sdiodev, SDIO_CCCR_BRCM_CARDCTRL, &err);
4046 	if (err)
4047 		goto fail;
4048 
4049 	reg_val |= SDIO_CCCR_BRCM_CARDCTRL_WLANRESET;
4050 
4051 	brcmf_sdiod_func0_wb(sdiodev, SDIO_CCCR_BRCM_CARDCTRL, reg_val, &err);
4052 	if (err)
4053 		goto fail;
4054 
4055 	/* set PMUControl so a backplane reset does PMU state reload */
4056 	reg_addr = CORE_CC_REG(brcmf_chip_get_pmu(bus->ci)->base, pmucontrol);
4057 	reg_val = brcmf_sdiod_readl(sdiodev, reg_addr, &err);
4058 	if (err)
4059 		goto fail;
4060 
4061 	reg_val |= (BCMA_CC_PMU_CTL_RES_RELOAD << BCMA_CC_PMU_CTL_RES_SHIFT);
4062 
4063 	brcmf_sdiod_writel(sdiodev, reg_addr, reg_val, &err);
4064 	if (err)
4065 		goto fail;
4066 
4067 	sdio_release_host(sdiodev->func1);
4068 
4069 	brcmu_pktq_init(&bus->txq, (PRIOMASK + 1), TXQLEN);
4070 
4071 	/* allocate header buffer */
4072 	bus->hdrbuf = kzalloc(MAX_HDR_READ + bus->head_align, GFP_KERNEL);
4073 	if (!bus->hdrbuf)
4074 		return false;
4075 	/* Locate an appropriately-aligned portion of hdrbuf */
4076 	bus->rxhdr = (u8 *) roundup((unsigned long)&bus->hdrbuf[0],
4077 				    bus->head_align);
4078 
4079 	/* Set the poll and/or interrupt flags */
4080 	bus->intr = true;
4081 	bus->poll = false;
4082 	if (bus->poll)
4083 		bus->pollrate = 1;
4084 
4085 	return true;
4086 
4087 fail:
4088 	sdio_release_host(sdiodev->func1);
4089 	return false;
4090 }
4091 
4092 static int
4093 brcmf_sdio_watchdog_thread(void *data)
4094 {
4095 	struct brcmf_sdio *bus = (struct brcmf_sdio *)data;
4096 	int wait;
4097 
4098 	allow_signal(SIGTERM);
4099 	/* Run until signal received */
4100 	brcmf_sdiod_freezer_count(bus->sdiodev);
4101 	while (1) {
4102 		if (kthread_should_stop())
4103 			break;
4104 		brcmf_sdiod_freezer_uncount(bus->sdiodev);
4105 		wait = wait_for_completion_interruptible(&bus->watchdog_wait);
4106 		brcmf_sdiod_freezer_count(bus->sdiodev);
4107 		brcmf_sdiod_try_freeze(bus->sdiodev);
4108 		if (!wait) {
4109 			brcmf_sdio_bus_watchdog(bus);
4110 			/* Count the tick for reference */
4111 			bus->sdcnt.tickcnt++;
4112 			reinit_completion(&bus->watchdog_wait);
4113 		} else
4114 			break;
4115 	}
4116 	return 0;
4117 }
4118 
4119 static void
4120 brcmf_sdio_watchdog(struct timer_list *t)
4121 {
4122 	struct brcmf_sdio *bus = from_timer(bus, t, timer);
4123 
4124 	if (bus->watchdog_tsk) {
4125 		complete(&bus->watchdog_wait);
4126 		/* Reschedule the watchdog */
4127 		if (bus->wd_active)
4128 			mod_timer(&bus->timer,
4129 				  jiffies + BRCMF_WD_POLL);
4130 	}
4131 }
4132 
4133 static int brcmf_sdio_get_blob(struct device *dev, const struct firmware **fw,
4134 			       enum brcmf_blob_type type)
4135 {
4136 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
4137 	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
4138 
4139 	switch (type) {
4140 	case BRCMF_BLOB_CLM:
4141 		*fw = sdiodev->clm_fw;
4142 		sdiodev->clm_fw = NULL;
4143 		break;
4144 	default:
4145 		return -ENOENT;
4146 	}
4147 
4148 	if (!*fw)
4149 		return -ENOENT;
4150 
4151 	return 0;
4152 }
4153 
4154 static int brcmf_sdio_bus_reset(struct device *dev)
4155 {
4156 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
4157 	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
4158 
4159 	brcmf_dbg(SDIO, "Enter\n");
4160 
4161 	/* start by unregistering irqs */
4162 	brcmf_sdiod_intr_unregister(sdiodev);
4163 
4164 	brcmf_sdiod_remove(sdiodev);
4165 
4166 	/* reset the adapter */
4167 	sdio_claim_host(sdiodev->func1);
4168 	mmc_hw_reset(sdiodev->func1->card);
4169 	sdio_release_host(sdiodev->func1);
4170 
4171 	brcmf_bus_change_state(sdiodev->bus_if, BRCMF_BUS_DOWN);
4172 	return 0;
4173 }
4174 
4175 static void brcmf_sdio_bus_remove(struct device *dev)
4176 {
4177 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
4178 	struct brcmf_sdio_dev *sdiod = bus_if->bus_priv.sdio;
4179 
4180 	device_release_driver(&sdiod->func2->dev);
4181 	device_release_driver(&sdiod->func1->dev);
4182 }
4183 
4184 static const struct brcmf_bus_ops brcmf_sdio_bus_ops = {
4185 	.stop = brcmf_sdio_bus_stop,
4186 	.preinit = brcmf_sdio_bus_preinit,
4187 	.txdata = brcmf_sdio_bus_txdata,
4188 	.txctl = brcmf_sdio_bus_txctl,
4189 	.rxctl = brcmf_sdio_bus_rxctl,
4190 	.gettxq = brcmf_sdio_bus_gettxq,
4191 	.wowl_config = brcmf_sdio_wowl_config,
4192 	.get_ramsize = brcmf_sdio_bus_get_ramsize,
4193 	.get_memdump = brcmf_sdio_bus_get_memdump,
4194 	.get_blob = brcmf_sdio_get_blob,
4195 	.debugfs_create = brcmf_sdio_debugfs_create,
4196 	.reset = brcmf_sdio_bus_reset,
4197 	.remove = brcmf_sdio_bus_remove,
4198 };
4199 
4200 #define BRCMF_SDIO_FW_CODE	0
4201 #define BRCMF_SDIO_FW_NVRAM	1
4202 #define BRCMF_SDIO_FW_CLM	2
4203 
4204 static void brcmf_sdio_firmware_callback(struct device *dev, int err,
4205 					 struct brcmf_fw_request *fwreq)
4206 {
4207 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
4208 	struct brcmf_sdio_dev *sdiod = bus_if->bus_priv.sdio;
4209 	struct brcmf_sdio *bus = sdiod->bus;
4210 	struct brcmf_core *core = bus->sdio_core;
4211 	const struct firmware *code;
4212 	void *nvram;
4213 	u32 nvram_len;
4214 	u8 saveclk, bpreq;
4215 	u8 devctl;
4216 
4217 	brcmf_dbg(TRACE, "Enter: dev=%s, err=%d\n", dev_name(dev), err);
4218 
4219 	if (err)
4220 		goto fail;
4221 
4222 	code = fwreq->items[BRCMF_SDIO_FW_CODE].binary;
4223 	nvram = fwreq->items[BRCMF_SDIO_FW_NVRAM].nv_data.data;
4224 	nvram_len = fwreq->items[BRCMF_SDIO_FW_NVRAM].nv_data.len;
4225 	sdiod->clm_fw = fwreq->items[BRCMF_SDIO_FW_CLM].binary;
4226 	kfree(fwreq);
4227 
4228 	/* try to download image and nvram to the dongle */
4229 	bus->alp_only = true;
4230 	err = brcmf_sdio_download_firmware(bus, code, nvram, nvram_len);
4231 	if (err)
4232 		goto fail;
4233 	bus->alp_only = false;
4234 
4235 	/* Start the watchdog timer */
4236 	bus->sdcnt.tickcnt = 0;
4237 	brcmf_sdio_wd_timer(bus, true);
4238 
4239 	sdio_claim_host(sdiod->func1);
4240 
4241 	/* Make sure backplane clock is on, needed to generate F2 interrupt */
4242 	brcmf_sdio_clkctl(bus, CLK_AVAIL, false);
4243 	if (bus->clkstate != CLK_AVAIL)
4244 		goto release;
4245 
4246 	/* Force clocks on backplane to be sure F2 interrupt propagates */
4247 	saveclk = brcmf_sdiod_readb(sdiod, SBSDIO_FUNC1_CHIPCLKCSR, &err);
4248 	if (!err) {
4249 		bpreq = saveclk;
4250 		bpreq |= brcmf_chip_is_ulp(bus->ci) ?
4251 			SBSDIO_HT_AVAIL_REQ : SBSDIO_FORCE_HT;
4252 		brcmf_sdiod_writeb(sdiod, SBSDIO_FUNC1_CHIPCLKCSR,
4253 				   bpreq, &err);
4254 	}
4255 	if (err) {
4256 		brcmf_err("Failed to force clock for F2: err %d\n", err);
4257 		goto release;
4258 	}
4259 
4260 	/* Enable function 2 (frame transfers) */
4261 	brcmf_sdiod_writel(sdiod, core->base + SD_REG(tosbmailboxdata),
4262 			   SDPCM_PROT_VERSION << SMB_DATA_VERSION_SHIFT, NULL);
4263 
4264 	err = sdio_enable_func(sdiod->func2);
4265 
4266 	brcmf_dbg(INFO, "enable F2: err=%d\n", err);
4267 
4268 	/* If F2 successfully enabled, set core and enable interrupts */
4269 	if (!err) {
4270 		/* Set up the interrupt mask and enable interrupts */
4271 		bus->hostintmask = HOSTINTMASK;
4272 		brcmf_sdiod_writel(sdiod, core->base + SD_REG(hostintmask),
4273 				   bus->hostintmask, NULL);
4274 
4275 		switch (sdiod->func1->device) {
4276 		case SDIO_DEVICE_ID_BROADCOM_CYPRESS_4373:
4277 		case SDIO_DEVICE_ID_BROADCOM_CYPRESS_43752:
4278 			brcmf_dbg(INFO, "set F2 watermark to 0x%x*4 bytes\n",
4279 				  CY_4373_F2_WATERMARK);
4280 			brcmf_sdiod_writeb(sdiod, SBSDIO_WATERMARK,
4281 					   CY_4373_F2_WATERMARK, &err);
4282 			devctl = brcmf_sdiod_readb(sdiod, SBSDIO_DEVICE_CTL,
4283 						   &err);
4284 			devctl |= SBSDIO_DEVCTL_F2WM_ENAB;
4285 			brcmf_sdiod_writeb(sdiod, SBSDIO_DEVICE_CTL, devctl,
4286 					   &err);
4287 			brcmf_sdiod_writeb(sdiod, SBSDIO_FUNC1_MESBUSYCTRL,
4288 					   CY_4373_F1_MESBUSYCTRL, &err);
4289 			break;
4290 		case SDIO_DEVICE_ID_BROADCOM_CYPRESS_43012:
4291 			brcmf_dbg(INFO, "set F2 watermark to 0x%x*4 bytes\n",
4292 				  CY_43012_F2_WATERMARK);
4293 			brcmf_sdiod_writeb(sdiod, SBSDIO_WATERMARK,
4294 					   CY_43012_F2_WATERMARK, &err);
4295 			devctl = brcmf_sdiod_readb(sdiod, SBSDIO_DEVICE_CTL,
4296 						   &err);
4297 			devctl |= SBSDIO_DEVCTL_F2WM_ENAB;
4298 			brcmf_sdiod_writeb(sdiod, SBSDIO_DEVICE_CTL, devctl,
4299 					   &err);
4300 			brcmf_sdiod_writeb(sdiod, SBSDIO_FUNC1_MESBUSYCTRL,
4301 					   CY_43012_MESBUSYCTRL, &err);
4302 			break;
4303 		case SDIO_DEVICE_ID_BROADCOM_4329:
4304 		case SDIO_DEVICE_ID_BROADCOM_4339:
4305 			brcmf_dbg(INFO, "set F2 watermark to 0x%x*4 bytes\n",
4306 				  CY_4339_F2_WATERMARK);
4307 			brcmf_sdiod_writeb(sdiod, SBSDIO_WATERMARK,
4308 					   CY_4339_F2_WATERMARK, &err);
4309 			devctl = brcmf_sdiod_readb(sdiod, SBSDIO_DEVICE_CTL,
4310 						   &err);
4311 			devctl |= SBSDIO_DEVCTL_F2WM_ENAB;
4312 			brcmf_sdiod_writeb(sdiod, SBSDIO_DEVICE_CTL, devctl,
4313 					   &err);
4314 			brcmf_sdiod_writeb(sdiod, SBSDIO_FUNC1_MESBUSYCTRL,
4315 					   CY_4339_MESBUSYCTRL, &err);
4316 			break;
4317 		case SDIO_DEVICE_ID_BROADCOM_43455:
4318 			brcmf_dbg(INFO, "set F2 watermark to 0x%x*4 bytes\n",
4319 				  CY_43455_F2_WATERMARK);
4320 			brcmf_sdiod_writeb(sdiod, SBSDIO_WATERMARK,
4321 					   CY_43455_F2_WATERMARK, &err);
4322 			devctl = brcmf_sdiod_readb(sdiod, SBSDIO_DEVICE_CTL,
4323 						   &err);
4324 			devctl |= SBSDIO_DEVCTL_F2WM_ENAB;
4325 			brcmf_sdiod_writeb(sdiod, SBSDIO_DEVICE_CTL, devctl,
4326 					   &err);
4327 			brcmf_sdiod_writeb(sdiod, SBSDIO_FUNC1_MESBUSYCTRL,
4328 					   CY_43455_MESBUSYCTRL, &err);
4329 			break;
4330 		case SDIO_DEVICE_ID_BROADCOM_4359:
4331 		case SDIO_DEVICE_ID_BROADCOM_4354:
4332 		case SDIO_DEVICE_ID_BROADCOM_4356:
4333 			brcmf_dbg(INFO, "set F2 watermark to 0x%x*4 bytes\n",
4334 				  CY_435X_F2_WATERMARK);
4335 			brcmf_sdiod_writeb(sdiod, SBSDIO_WATERMARK,
4336 					   CY_435X_F2_WATERMARK, &err);
4337 			devctl = brcmf_sdiod_readb(sdiod, SBSDIO_DEVICE_CTL,
4338 						   &err);
4339 			devctl |= SBSDIO_DEVCTL_F2WM_ENAB;
4340 			brcmf_sdiod_writeb(sdiod, SBSDIO_DEVICE_CTL, devctl,
4341 					   &err);
4342 			brcmf_sdiod_writeb(sdiod, SBSDIO_FUNC1_MESBUSYCTRL,
4343 					   CY_435X_F1_MESBUSYCTRL, &err);
4344 			break;
4345 		default:
4346 			brcmf_sdiod_writeb(sdiod, SBSDIO_WATERMARK,
4347 					   DEFAULT_F2_WATERMARK, &err);
4348 			break;
4349 		}
4350 	} else {
4351 		/* Disable F2 again */
4352 		sdio_disable_func(sdiod->func2);
4353 		goto checkdied;
4354 	}
4355 
4356 	if (brcmf_chip_sr_capable(bus->ci)) {
4357 		brcmf_sdio_sr_init(bus);
4358 	} else {
4359 		/* Restore previous clock setting */
4360 		brcmf_sdiod_writeb(sdiod, SBSDIO_FUNC1_CHIPCLKCSR,
4361 				   saveclk, &err);
4362 	}
4363 
4364 	if (err == 0) {
4365 		/* Assign bus interface call back */
4366 		sdiod->bus_if->dev = sdiod->dev;
4367 		sdiod->bus_if->ops = &brcmf_sdio_bus_ops;
4368 		sdiod->bus_if->chip = bus->ci->chip;
4369 		sdiod->bus_if->chiprev = bus->ci->chiprev;
4370 
4371 		/* Allow full data communication using DPC from now on. */
4372 		brcmf_sdiod_change_state(bus->sdiodev, BRCMF_SDIOD_DATA);
4373 
4374 		err = brcmf_sdiod_intr_register(sdiod);
4375 		if (err != 0)
4376 			brcmf_err("intr register failed:%d\n", err);
4377 	}
4378 
4379 	/* If we didn't come up, turn off backplane clock */
4380 	if (err != 0) {
4381 		brcmf_sdio_clkctl(bus, CLK_NONE, false);
4382 		goto checkdied;
4383 	}
4384 
4385 	sdio_release_host(sdiod->func1);
4386 
4387 	err = brcmf_alloc(sdiod->dev, sdiod->settings);
4388 	if (err) {
4389 		brcmf_err("brcmf_alloc failed\n");
4390 		goto claim;
4391 	}
4392 
4393 	/* Attach to the common layer, reserve hdr space */
4394 	err = brcmf_attach(sdiod->dev);
4395 	if (err != 0) {
4396 		brcmf_err("brcmf_attach failed\n");
4397 		goto free;
4398 	}
4399 
4400 	/* ready */
4401 	return;
4402 
4403 free:
4404 	brcmf_free(sdiod->dev);
4405 claim:
4406 	sdio_claim_host(sdiod->func1);
4407 checkdied:
4408 	brcmf_sdio_checkdied(bus);
4409 release:
4410 	sdio_release_host(sdiod->func1);
4411 fail:
4412 	brcmf_dbg(TRACE, "failed: dev=%s, err=%d\n", dev_name(dev), err);
4413 	device_release_driver(&sdiod->func2->dev);
4414 	device_release_driver(dev);
4415 }
4416 
4417 static struct brcmf_fw_request *
4418 brcmf_sdio_prepare_fw_request(struct brcmf_sdio *bus)
4419 {
4420 	struct brcmf_fw_request *fwreq;
4421 	struct brcmf_fw_name fwnames[] = {
4422 		{ ".bin", bus->sdiodev->fw_name },
4423 		{ ".txt", bus->sdiodev->nvram_name },
4424 		{ ".clm_blob", bus->sdiodev->clm_name },
4425 	};
4426 
4427 	fwreq = brcmf_fw_alloc_request(bus->ci->chip, bus->ci->chiprev,
4428 				       brcmf_sdio_fwnames,
4429 				       ARRAY_SIZE(brcmf_sdio_fwnames),
4430 				       fwnames, ARRAY_SIZE(fwnames));
4431 	if (!fwreq)
4432 		return NULL;
4433 
4434 	fwreq->items[BRCMF_SDIO_FW_CODE].type = BRCMF_FW_TYPE_BINARY;
4435 	fwreq->items[BRCMF_SDIO_FW_NVRAM].type = BRCMF_FW_TYPE_NVRAM;
4436 	fwreq->items[BRCMF_SDIO_FW_CLM].type = BRCMF_FW_TYPE_BINARY;
4437 	fwreq->items[BRCMF_SDIO_FW_CLM].flags = BRCMF_FW_REQF_OPTIONAL;
4438 	fwreq->board_types[0] = bus->sdiodev->settings->board_type;
4439 
4440 	return fwreq;
4441 }
4442 
4443 struct brcmf_sdio *brcmf_sdio_probe(struct brcmf_sdio_dev *sdiodev)
4444 {
4445 	int ret;
4446 	struct brcmf_sdio *bus;
4447 	struct workqueue_struct *wq;
4448 	struct brcmf_fw_request *fwreq;
4449 
4450 	brcmf_dbg(TRACE, "Enter\n");
4451 
4452 	/* Allocate private bus interface state */
4453 	bus = kzalloc(sizeof(struct brcmf_sdio), GFP_ATOMIC);
4454 	if (!bus)
4455 		goto fail;
4456 
4457 	bus->sdiodev = sdiodev;
4458 	sdiodev->bus = bus;
4459 	skb_queue_head_init(&bus->glom);
4460 	bus->txbound = BRCMF_TXBOUND;
4461 	bus->rxbound = BRCMF_RXBOUND;
4462 	bus->txminmax = BRCMF_TXMINMAX;
4463 	bus->tx_seq = SDPCM_SEQ_WRAP - 1;
4464 
4465 	/* single-threaded workqueue */
4466 	wq = alloc_ordered_workqueue("brcmf_wq/%s", WQ_MEM_RECLAIM | WQ_HIGHPRI,
4467 				     dev_name(&sdiodev->func1->dev));
4468 	if (!wq) {
4469 		brcmf_err("insufficient memory to create txworkqueue\n");
4470 		goto fail;
4471 	}
4472 	brcmf_sdiod_freezer_count(sdiodev);
4473 	INIT_WORK(&bus->datawork, brcmf_sdio_dataworker);
4474 	bus->brcmf_wq = wq;
4475 
4476 	/* attempt to attach to the dongle */
4477 	if (!(brcmf_sdio_probe_attach(bus))) {
4478 		brcmf_err("brcmf_sdio_probe_attach failed\n");
4479 		goto fail;
4480 	}
4481 
4482 	spin_lock_init(&bus->rxctl_lock);
4483 	spin_lock_init(&bus->txq_lock);
4484 	init_waitqueue_head(&bus->ctrl_wait);
4485 	init_waitqueue_head(&bus->dcmd_resp_wait);
4486 
4487 	/* Set up the watchdog timer */
4488 	timer_setup(&bus->timer, brcmf_sdio_watchdog, 0);
4489 	/* Initialize watchdog thread */
4490 	init_completion(&bus->watchdog_wait);
4491 	bus->watchdog_tsk = kthread_run(brcmf_sdio_watchdog_thread,
4492 					bus, "brcmf_wdog/%s",
4493 					dev_name(&sdiodev->func1->dev));
4494 	if (IS_ERR(bus->watchdog_tsk)) {
4495 		pr_warn("brcmf_watchdog thread failed to start\n");
4496 		bus->watchdog_tsk = NULL;
4497 	}
4498 	/* Initialize DPC thread */
4499 	bus->dpc_triggered = false;
4500 	bus->dpc_running = false;
4501 
4502 	/* default sdio bus header length for tx packet */
4503 	bus->tx_hdrlen = SDPCM_HWHDR_LEN + SDPCM_SWHDR_LEN;
4504 
4505 	/* Query the F2 block size, set roundup accordingly */
4506 	bus->blocksize = bus->sdiodev->func2->cur_blksize;
4507 	bus->roundup = min(max_roundup, bus->blocksize);
4508 
4509 	sdio_claim_host(bus->sdiodev->func1);
4510 
4511 	/* Disable F2 to clear any intermediate frame state on the dongle */
4512 	sdio_disable_func(bus->sdiodev->func2);
4513 
4514 	bus->rxflow = false;
4515 
4516 	/* Done with backplane-dependent accesses, can drop clock... */
4517 	brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, 0, NULL);
4518 
4519 	sdio_release_host(bus->sdiodev->func1);
4520 
4521 	/* ...and initialize clock/power states */
4522 	bus->clkstate = CLK_SDONLY;
4523 	bus->idletime = BRCMF_IDLE_INTERVAL;
4524 	bus->idleclock = BRCMF_IDLE_ACTIVE;
4525 
4526 	/* SR state */
4527 	bus->sr_enabled = false;
4528 
4529 	brcmf_dbg(INFO, "completed!!\n");
4530 
4531 	fwreq = brcmf_sdio_prepare_fw_request(bus);
4532 	if (!fwreq) {
4533 		ret = -ENOMEM;
4534 		goto fail;
4535 	}
4536 
4537 	ret = brcmf_fw_get_firmwares(sdiodev->dev, fwreq,
4538 				     brcmf_sdio_firmware_callback);
4539 	if (ret != 0) {
4540 		brcmf_err("async firmware request failed: %d\n", ret);
4541 		kfree(fwreq);
4542 		goto fail;
4543 	}
4544 
4545 	return bus;
4546 
4547 fail:
4548 	brcmf_sdio_remove(bus);
4549 	return NULL;
4550 }
4551 
4552 /* Detach and free everything */
4553 void brcmf_sdio_remove(struct brcmf_sdio *bus)
4554 {
4555 	brcmf_dbg(TRACE, "Enter\n");
4556 
4557 	if (bus) {
4558 		/* Stop watchdog task */
4559 		if (bus->watchdog_tsk) {
4560 			send_sig(SIGTERM, bus->watchdog_tsk, 1);
4561 			kthread_stop(bus->watchdog_tsk);
4562 			bus->watchdog_tsk = NULL;
4563 		}
4564 
4565 		/* De-register interrupt handler */
4566 		brcmf_sdiod_intr_unregister(bus->sdiodev);
4567 
4568 		brcmf_detach(bus->sdiodev->dev);
4569 		brcmf_free(bus->sdiodev->dev);
4570 
4571 		cancel_work_sync(&bus->datawork);
4572 		if (bus->brcmf_wq)
4573 			destroy_workqueue(bus->brcmf_wq);
4574 
4575 		if (bus->ci) {
4576 			if (bus->sdiodev->state != BRCMF_SDIOD_NOMEDIUM) {
4577 				sdio_claim_host(bus->sdiodev->func1);
4578 				brcmf_sdio_wd_timer(bus, false);
4579 				brcmf_sdio_clkctl(bus, CLK_AVAIL, false);
4580 				/* Leave the device in state where it is
4581 				 * 'passive'. This is done by resetting all
4582 				 * necessary cores.
4583 				 */
4584 				msleep(20);
4585 				brcmf_chip_set_passive(bus->ci);
4586 				brcmf_sdio_clkctl(bus, CLK_NONE, false);
4587 				sdio_release_host(bus->sdiodev->func1);
4588 			}
4589 			brcmf_chip_detach(bus->ci);
4590 		}
4591 		if (bus->sdiodev->settings)
4592 			brcmf_release_module_param(bus->sdiodev->settings);
4593 
4594 		release_firmware(bus->sdiodev->clm_fw);
4595 		bus->sdiodev->clm_fw = NULL;
4596 		kfree(bus->rxbuf);
4597 		kfree(bus->hdrbuf);
4598 		kfree(bus);
4599 	}
4600 
4601 	brcmf_dbg(TRACE, "Disconnected\n");
4602 }
4603 
4604 void brcmf_sdio_wd_timer(struct brcmf_sdio *bus, bool active)
4605 {
4606 	/* Totally stop the timer */
4607 	if (!active && bus->wd_active) {
4608 		del_timer_sync(&bus->timer);
4609 		bus->wd_active = false;
4610 		return;
4611 	}
4612 
4613 	/* don't start the wd until fw is loaded */
4614 	if (bus->sdiodev->state != BRCMF_SDIOD_DATA)
4615 		return;
4616 
4617 	if (active) {
4618 		if (!bus->wd_active) {
4619 			/* Create timer again when watchdog period is
4620 			   dynamically changed or in the first instance
4621 			 */
4622 			bus->timer.expires = jiffies + BRCMF_WD_POLL;
4623 			add_timer(&bus->timer);
4624 			bus->wd_active = true;
4625 		} else {
4626 			/* Re arm the timer, at last watchdog period */
4627 			mod_timer(&bus->timer, jiffies + BRCMF_WD_POLL);
4628 		}
4629 	}
4630 }
4631 
4632 int brcmf_sdio_sleep(struct brcmf_sdio *bus, bool sleep)
4633 {
4634 	int ret;
4635 
4636 	sdio_claim_host(bus->sdiodev->func1);
4637 	ret = brcmf_sdio_bus_sleep(bus, sleep, false);
4638 	sdio_release_host(bus->sdiodev->func1);
4639 
4640 	return ret;
4641 }
4642