1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2001,2002,2003,2004 Broadcom Corporation
4  * Copyright (c) 2006, 2007  Maciej W. Rozycki
5  *
6  * This driver is designed for the Broadcom SiByte SOC built-in
7  * Ethernet controllers. Written by Mitch Lichtenberg at Broadcom Corp.
8  *
9  * Updated to the driver model and the PHY abstraction layer
10  * by Maciej W. Rozycki.
11  */
12 
13 #include <linux/bug.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/timer.h>
18 #include <linux/errno.h>
19 #include <linux/ioport.h>
20 #include <linux/slab.h>
21 #include <linux/interrupt.h>
22 #include <linux/netdevice.h>
23 #include <linux/etherdevice.h>
24 #include <linux/skbuff.h>
25 #include <linux/bitops.h>
26 #include <linux/err.h>
27 #include <linux/ethtool.h>
28 #include <linux/mii.h>
29 #include <linux/phy.h>
30 #include <linux/platform_device.h>
31 #include <linux/prefetch.h>
32 
33 #include <asm/cache.h>
34 #include <asm/io.h>
35 #include <asm/processor.h>	/* Processor type for cache alignment. */
36 
37 /* Operational parameters that usually are not changed. */
38 
39 #define CONFIG_SBMAC_COALESCE
40 
41 /* Time in jiffies before concluding the transmitter is hung. */
42 #define TX_TIMEOUT  (2*HZ)
43 
44 
45 MODULE_AUTHOR("Mitch Lichtenberg (Broadcom Corp.)");
46 MODULE_DESCRIPTION("Broadcom SiByte SOC GB Ethernet driver");
47 
48 /* A few user-configurable values which may be modified when a driver
49    module is loaded. */
50 
51 /* 1 normal messages, 0 quiet .. 7 verbose. */
52 static int debug = 1;
53 module_param(debug, int, 0444);
54 MODULE_PARM_DESC(debug, "Debug messages");
55 
56 #ifdef CONFIG_SBMAC_COALESCE
57 static int int_pktcnt_tx = 255;
58 module_param(int_pktcnt_tx, int, 0444);
59 MODULE_PARM_DESC(int_pktcnt_tx, "TX packet count");
60 
61 static int int_timeout_tx = 255;
62 module_param(int_timeout_tx, int, 0444);
63 MODULE_PARM_DESC(int_timeout_tx, "TX timeout value");
64 
65 static int int_pktcnt_rx = 64;
66 module_param(int_pktcnt_rx, int, 0444);
67 MODULE_PARM_DESC(int_pktcnt_rx, "RX packet count");
68 
69 static int int_timeout_rx = 64;
70 module_param(int_timeout_rx, int, 0444);
71 MODULE_PARM_DESC(int_timeout_rx, "RX timeout value");
72 #endif
73 
74 #include <asm/sibyte/board.h>
75 #include <asm/sibyte/sb1250.h>
76 #if defined(CONFIG_SIBYTE_BCM1x80)
77 #include <asm/sibyte/bcm1480_regs.h>
78 #include <asm/sibyte/bcm1480_int.h>
79 #define R_MAC_DMA_OODPKTLOST_RX	R_MAC_DMA_OODPKTLOST
80 #elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
81 #include <asm/sibyte/sb1250_regs.h>
82 #include <asm/sibyte/sb1250_int.h>
83 #else
84 #error invalid SiByte MAC configuration
85 #endif
86 #include <asm/sibyte/sb1250_scd.h>
87 #include <asm/sibyte/sb1250_mac.h>
88 #include <asm/sibyte/sb1250_dma.h>
89 
90 #if defined(CONFIG_SIBYTE_BCM1x80)
91 #define UNIT_INT(n)		(K_BCM1480_INT_MAC_0 + ((n) * 2))
92 #elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
93 #define UNIT_INT(n)		(K_INT_MAC_0 + (n))
94 #else
95 #error invalid SiByte MAC configuration
96 #endif
97 
98 #ifdef K_INT_PHY
99 #define SBMAC_PHY_INT			K_INT_PHY
100 #else
101 #define SBMAC_PHY_INT			PHY_POLL
102 #endif
103 
104 /**********************************************************************
105  *  Simple types
106  ********************************************************************* */
107 
108 enum sbmac_speed {
109 	sbmac_speed_none = 0,
110 	sbmac_speed_10 = SPEED_10,
111 	sbmac_speed_100 = SPEED_100,
112 	sbmac_speed_1000 = SPEED_1000,
113 };
114 
115 enum sbmac_duplex {
116 	sbmac_duplex_none = -1,
117 	sbmac_duplex_half = DUPLEX_HALF,
118 	sbmac_duplex_full = DUPLEX_FULL,
119 };
120 
121 enum sbmac_fc {
122 	sbmac_fc_none,
123 	sbmac_fc_disabled,
124 	sbmac_fc_frame,
125 	sbmac_fc_collision,
126 	sbmac_fc_carrier,
127 };
128 
129 enum sbmac_state {
130 	sbmac_state_uninit,
131 	sbmac_state_off,
132 	sbmac_state_on,
133 	sbmac_state_broken,
134 };
135 
136 
137 /**********************************************************************
138  *  Macros
139  ********************************************************************* */
140 
141 
142 #define SBDMA_NEXTBUF(d,f) ((((d)->f+1) == (d)->sbdma_dscrtable_end) ? \
143 			  (d)->sbdma_dscrtable : (d)->f+1)
144 
145 
146 #define NUMCACHEBLKS(x) DIV_ROUND_UP(x, SMP_CACHE_BYTES)
147 
148 #define SBMAC_MAX_TXDESCR	256
149 #define SBMAC_MAX_RXDESCR	256
150 
151 #define ENET_PACKET_SIZE	1518
152 /*#define ENET_PACKET_SIZE	9216 */
153 
154 /**********************************************************************
155  *  DMA Descriptor structure
156  ********************************************************************* */
157 
158 struct sbdmadscr {
159 	uint64_t  dscr_a;
160 	uint64_t  dscr_b;
161 };
162 
163 /**********************************************************************
164  *  DMA Controller structure
165  ********************************************************************* */
166 
167 struct sbmacdma {
168 
169 	/*
170 	 * This stuff is used to identify the channel and the registers
171 	 * associated with it.
172 	 */
173 	struct sbmac_softc	*sbdma_eth;	/* back pointer to associated
174 						   MAC */
175 	int			sbdma_channel;	/* channel number */
176 	int			sbdma_txdir;	/* direction (1=transmit) */
177 	int			sbdma_maxdescr;	/* total # of descriptors
178 						   in ring */
179 #ifdef CONFIG_SBMAC_COALESCE
180 	int			sbdma_int_pktcnt;
181 						/* # descriptors rx/tx
182 						   before interrupt */
183 	int			sbdma_int_timeout;
184 						/* # usec rx/tx interrupt */
185 #endif
186 	void __iomem		*sbdma_config0;	/* DMA config register 0 */
187 	void __iomem		*sbdma_config1;	/* DMA config register 1 */
188 	void __iomem		*sbdma_dscrbase;
189 						/* descriptor base address */
190 	void __iomem		*sbdma_dscrcnt;	/* descriptor count register */
191 	void __iomem		*sbdma_curdscr;	/* current descriptor
192 						   address */
193 	void __iomem		*sbdma_oodpktlost;
194 						/* pkt drop (rx only) */
195 
196 	/*
197 	 * This stuff is for maintenance of the ring
198 	 */
199 	void			*sbdma_dscrtable_unaligned;
200 	struct sbdmadscr	*sbdma_dscrtable;
201 						/* base of descriptor table */
202 	struct sbdmadscr	*sbdma_dscrtable_end;
203 						/* end of descriptor table */
204 	struct sk_buff		**sbdma_ctxtable;
205 						/* context table, one
206 						   per descr */
207 	dma_addr_t		sbdma_dscrtable_phys;
208 						/* and also the phys addr */
209 	struct sbdmadscr	*sbdma_addptr;	/* next dscr for sw to add */
210 	struct sbdmadscr	*sbdma_remptr;	/* next dscr for sw
211 						   to remove */
212 };
213 
214 
215 /**********************************************************************
216  *  Ethernet softc structure
217  ********************************************************************* */
218 
219 struct sbmac_softc {
220 
221 	/*
222 	 * Linux-specific things
223 	 */
224 	struct net_device	*sbm_dev;	/* pointer to linux device */
225 	struct napi_struct	napi;
226 	struct phy_device	*phy_dev;	/* the associated PHY device */
227 	struct mii_bus		*mii_bus;	/* the MII bus */
228 	spinlock_t		sbm_lock;	/* spin lock */
229 	int			sbm_devflags;	/* current device flags */
230 
231 	/*
232 	 * Controller-specific things
233 	 */
234 	void __iomem		*sbm_base;	/* MAC's base address */
235 	enum sbmac_state	sbm_state;	/* current state */
236 
237 	void __iomem		*sbm_macenable;	/* MAC Enable Register */
238 	void __iomem		*sbm_maccfg;	/* MAC Config Register */
239 	void __iomem		*sbm_fifocfg;	/* FIFO Config Register */
240 	void __iomem		*sbm_framecfg;	/* Frame Config Register */
241 	void __iomem		*sbm_rxfilter;	/* Receive Filter Register */
242 	void __iomem		*sbm_isr;	/* Interrupt Status Register */
243 	void __iomem		*sbm_imr;	/* Interrupt Mask Register */
244 	void __iomem		*sbm_mdio;	/* MDIO Register */
245 
246 	enum sbmac_speed	sbm_speed;	/* current speed */
247 	enum sbmac_duplex	sbm_duplex;	/* current duplex */
248 	enum sbmac_fc		sbm_fc;		/* cur. flow control setting */
249 	int			sbm_pause;	/* current pause setting */
250 	int			sbm_link;	/* current link state */
251 
252 	unsigned char		sbm_hwaddr[ETH_ALEN];
253 
254 	struct sbmacdma		sbm_txdma;	/* only channel 0 for now */
255 	struct sbmacdma		sbm_rxdma;
256 	int			rx_hw_checksum;
257 	int			sbe_idx;
258 };
259 
260 
261 /**********************************************************************
262  *  Externs
263  ********************************************************************* */
264 
265 /**********************************************************************
266  *  Prototypes
267  ********************************************************************* */
268 
269 static void sbdma_initctx(struct sbmacdma *d, struct sbmac_softc *s, int chan,
270 			  int txrx, int maxdescr);
271 static void sbdma_channel_start(struct sbmacdma *d, int rxtx);
272 static int sbdma_add_rcvbuffer(struct sbmac_softc *sc, struct sbmacdma *d,
273 			       struct sk_buff *m);
274 static int sbdma_add_txbuffer(struct sbmacdma *d, struct sk_buff *m);
275 static void sbdma_emptyring(struct sbmacdma *d);
276 static void sbdma_fillring(struct sbmac_softc *sc, struct sbmacdma *d);
277 static int sbdma_rx_process(struct sbmac_softc *sc, struct sbmacdma *d,
278 			    int work_to_do, int poll);
279 static void sbdma_tx_process(struct sbmac_softc *sc, struct sbmacdma *d,
280 			     int poll);
281 static int sbmac_initctx(struct sbmac_softc *s);
282 static void sbmac_channel_start(struct sbmac_softc *s);
283 static void sbmac_channel_stop(struct sbmac_softc *s);
284 static enum sbmac_state sbmac_set_channel_state(struct sbmac_softc *,
285 						enum sbmac_state);
286 static void sbmac_promiscuous_mode(struct sbmac_softc *sc, int onoff);
287 static uint64_t sbmac_addr2reg(unsigned char *ptr);
288 static irqreturn_t sbmac_intr(int irq, void *dev_instance);
289 static netdev_tx_t sbmac_start_tx(struct sk_buff *skb, struct net_device *dev);
290 static void sbmac_setmulti(struct sbmac_softc *sc);
291 static int sbmac_init(struct platform_device *pldev, long long base);
292 static int sbmac_set_speed(struct sbmac_softc *s, enum sbmac_speed speed);
293 static int sbmac_set_duplex(struct sbmac_softc *s, enum sbmac_duplex duplex,
294 			    enum sbmac_fc fc);
295 
296 static int sbmac_open(struct net_device *dev);
297 static void sbmac_tx_timeout (struct net_device *dev, unsigned int txqueue);
298 static void sbmac_set_rx_mode(struct net_device *dev);
299 static int sbmac_mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
300 static int sbmac_close(struct net_device *dev);
301 static int sbmac_poll(struct napi_struct *napi, int budget);
302 
303 static void sbmac_mii_poll(struct net_device *dev);
304 static int sbmac_mii_probe(struct net_device *dev);
305 
306 static void sbmac_mii_sync(void __iomem *sbm_mdio);
307 static void sbmac_mii_senddata(void __iomem *sbm_mdio, unsigned int data,
308 			       int bitcnt);
309 static int sbmac_mii_read(struct mii_bus *bus, int phyaddr, int regidx);
310 static int sbmac_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
311 			   u16 val);
312 
313 
314 /**********************************************************************
315  *  Globals
316  ********************************************************************* */
317 
318 static char sbmac_string[] = "sb1250-mac";
319 
320 static char sbmac_mdio_string[] = "sb1250-mac-mdio";
321 
322 
323 /**********************************************************************
324  *  MDIO constants
325  ********************************************************************* */
326 
327 #define	MII_COMMAND_START	0x01
328 #define	MII_COMMAND_READ	0x02
329 #define	MII_COMMAND_WRITE	0x01
330 #define	MII_COMMAND_ACK		0x02
331 
332 #define M_MAC_MDIO_DIR_OUTPUT	0		/* for clarity */
333 
334 #define ENABLE 		1
335 #define DISABLE		0
336 
337 /**********************************************************************
338  *  SBMAC_MII_SYNC(sbm_mdio)
339  *
340  *  Synchronize with the MII - send a pattern of bits to the MII
341  *  that will guarantee that it is ready to accept a command.
342  *
343  *  Input parameters:
344  *  	   sbm_mdio - address of the MAC's MDIO register
345  *
346  *  Return value:
347  *  	   nothing
348  ********************************************************************* */
349 
sbmac_mii_sync(void __iomem * sbm_mdio)350 static void sbmac_mii_sync(void __iomem *sbm_mdio)
351 {
352 	int cnt;
353 	uint64_t bits;
354 	int mac_mdio_genc;
355 
356 	mac_mdio_genc = __raw_readq(sbm_mdio) & M_MAC_GENC;
357 
358 	bits = M_MAC_MDIO_DIR_OUTPUT | M_MAC_MDIO_OUT;
359 
360 	__raw_writeq(bits | mac_mdio_genc, sbm_mdio);
361 
362 	for (cnt = 0; cnt < 32; cnt++) {
363 		__raw_writeq(bits | M_MAC_MDC | mac_mdio_genc, sbm_mdio);
364 		__raw_writeq(bits | mac_mdio_genc, sbm_mdio);
365 	}
366 }
367 
368 /**********************************************************************
369  *  SBMAC_MII_SENDDATA(sbm_mdio, data, bitcnt)
370  *
371  *  Send some bits to the MII.  The bits to be sent are right-
372  *  justified in the 'data' parameter.
373  *
374  *  Input parameters:
375  *  	   sbm_mdio - address of the MAC's MDIO register
376  *  	   data     - data to send
377  *  	   bitcnt   - number of bits to send
378  ********************************************************************* */
379 
sbmac_mii_senddata(void __iomem * sbm_mdio,unsigned int data,int bitcnt)380 static void sbmac_mii_senddata(void __iomem *sbm_mdio, unsigned int data,
381 			       int bitcnt)
382 {
383 	int i;
384 	uint64_t bits;
385 	unsigned int curmask;
386 	int mac_mdio_genc;
387 
388 	mac_mdio_genc = __raw_readq(sbm_mdio) & M_MAC_GENC;
389 
390 	bits = M_MAC_MDIO_DIR_OUTPUT;
391 	__raw_writeq(bits | mac_mdio_genc, sbm_mdio);
392 
393 	curmask = 1 << (bitcnt - 1);
394 
395 	for (i = 0; i < bitcnt; i++) {
396 		if (data & curmask)
397 			bits |= M_MAC_MDIO_OUT;
398 		else bits &= ~M_MAC_MDIO_OUT;
399 		__raw_writeq(bits | mac_mdio_genc, sbm_mdio);
400 		__raw_writeq(bits | M_MAC_MDC | mac_mdio_genc, sbm_mdio);
401 		__raw_writeq(bits | mac_mdio_genc, sbm_mdio);
402 		curmask >>= 1;
403 	}
404 }
405 
406 
407 
408 /**********************************************************************
409  *  SBMAC_MII_READ(bus, phyaddr, regidx)
410  *  Read a PHY register.
411  *
412  *  Input parameters:
413  *  	   bus     - MDIO bus handle
414  *  	   phyaddr - PHY's address
415  *  	   regnum  - index of register to read
416  *
417  *  Return value:
418  *  	   value read, or 0xffff if an error occurred.
419  ********************************************************************* */
420 
sbmac_mii_read(struct mii_bus * bus,int phyaddr,int regidx)421 static int sbmac_mii_read(struct mii_bus *bus, int phyaddr, int regidx)
422 {
423 	struct sbmac_softc *sc = (struct sbmac_softc *)bus->priv;
424 	void __iomem *sbm_mdio = sc->sbm_mdio;
425 	int idx;
426 	int error;
427 	int regval;
428 	int mac_mdio_genc;
429 
430 	/*
431 	 * Synchronize ourselves so that the PHY knows the next
432 	 * thing coming down is a command
433 	 */
434 	sbmac_mii_sync(sbm_mdio);
435 
436 	/*
437 	 * Send the data to the PHY.  The sequence is
438 	 * a "start" command (2 bits)
439 	 * a "read" command (2 bits)
440 	 * the PHY addr (5 bits)
441 	 * the register index (5 bits)
442 	 */
443 	sbmac_mii_senddata(sbm_mdio, MII_COMMAND_START, 2);
444 	sbmac_mii_senddata(sbm_mdio, MII_COMMAND_READ, 2);
445 	sbmac_mii_senddata(sbm_mdio, phyaddr, 5);
446 	sbmac_mii_senddata(sbm_mdio, regidx, 5);
447 
448 	mac_mdio_genc = __raw_readq(sbm_mdio) & M_MAC_GENC;
449 
450 	/*
451 	 * Switch the port around without a clock transition.
452 	 */
453 	__raw_writeq(M_MAC_MDIO_DIR_INPUT | mac_mdio_genc, sbm_mdio);
454 
455 	/*
456 	 * Send out a clock pulse to signal we want the status
457 	 */
458 	__raw_writeq(M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc,
459 		     sbm_mdio);
460 	__raw_writeq(M_MAC_MDIO_DIR_INPUT | mac_mdio_genc, sbm_mdio);
461 
462 	/*
463 	 * If an error occurred, the PHY will signal '1' back
464 	 */
465 	error = __raw_readq(sbm_mdio) & M_MAC_MDIO_IN;
466 
467 	/*
468 	 * Issue an 'idle' clock pulse, but keep the direction
469 	 * the same.
470 	 */
471 	__raw_writeq(M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc,
472 		     sbm_mdio);
473 	__raw_writeq(M_MAC_MDIO_DIR_INPUT | mac_mdio_genc, sbm_mdio);
474 
475 	regval = 0;
476 
477 	for (idx = 0; idx < 16; idx++) {
478 		regval <<= 1;
479 
480 		if (error == 0) {
481 			if (__raw_readq(sbm_mdio) & M_MAC_MDIO_IN)
482 				regval |= 1;
483 		}
484 
485 		__raw_writeq(M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc,
486 			     sbm_mdio);
487 		__raw_writeq(M_MAC_MDIO_DIR_INPUT | mac_mdio_genc, sbm_mdio);
488 	}
489 
490 	/* Switch back to output */
491 	__raw_writeq(M_MAC_MDIO_DIR_OUTPUT | mac_mdio_genc, sbm_mdio);
492 
493 	if (error == 0)
494 		return regval;
495 	return 0xffff;
496 }
497 
498 
499 /**********************************************************************
500  *  SBMAC_MII_WRITE(bus, phyaddr, regidx, regval)
501  *
502  *  Write a value to a PHY register.
503  *
504  *  Input parameters:
505  *  	   bus     - MDIO bus handle
506  *  	   phyaddr - PHY to use
507  *  	   regidx  - register within the PHY
508  *  	   regval  - data to write to register
509  *
510  *  Return value:
511  *  	   0 for success
512  ********************************************************************* */
513 
sbmac_mii_write(struct mii_bus * bus,int phyaddr,int regidx,u16 regval)514 static int sbmac_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
515 			   u16 regval)
516 {
517 	struct sbmac_softc *sc = (struct sbmac_softc *)bus->priv;
518 	void __iomem *sbm_mdio = sc->sbm_mdio;
519 	int mac_mdio_genc;
520 
521 	sbmac_mii_sync(sbm_mdio);
522 
523 	sbmac_mii_senddata(sbm_mdio, MII_COMMAND_START, 2);
524 	sbmac_mii_senddata(sbm_mdio, MII_COMMAND_WRITE, 2);
525 	sbmac_mii_senddata(sbm_mdio, phyaddr, 5);
526 	sbmac_mii_senddata(sbm_mdio, regidx, 5);
527 	sbmac_mii_senddata(sbm_mdio, MII_COMMAND_ACK, 2);
528 	sbmac_mii_senddata(sbm_mdio, regval, 16);
529 
530 	mac_mdio_genc = __raw_readq(sbm_mdio) & M_MAC_GENC;
531 
532 	__raw_writeq(M_MAC_MDIO_DIR_OUTPUT | mac_mdio_genc, sbm_mdio);
533 
534 	return 0;
535 }
536 
537 
538 
539 /**********************************************************************
540  *  SBDMA_INITCTX(d,s,chan,txrx,maxdescr)
541  *
542  *  Initialize a DMA channel context.  Since there are potentially
543  *  eight DMA channels per MAC, it's nice to do this in a standard
544  *  way.
545  *
546  *  Input parameters:
547  *  	   d - struct sbmacdma (DMA channel context)
548  *  	   s - struct sbmac_softc (pointer to a MAC)
549  *  	   chan - channel number (0..1 right now)
550  *  	   txrx - Identifies DMA_TX or DMA_RX for channel direction
551  *      maxdescr - number of descriptors
552  *
553  *  Return value:
554  *  	   nothing
555  ********************************************************************* */
556 
sbdma_initctx(struct sbmacdma * d,struct sbmac_softc * s,int chan,int txrx,int maxdescr)557 static void sbdma_initctx(struct sbmacdma *d, struct sbmac_softc *s, int chan,
558 			  int txrx, int maxdescr)
559 {
560 #ifdef CONFIG_SBMAC_COALESCE
561 	int int_pktcnt, int_timeout;
562 #endif
563 
564 	/*
565 	 * Save away interesting stuff in the structure
566 	 */
567 
568 	d->sbdma_eth       = s;
569 	d->sbdma_channel   = chan;
570 	d->sbdma_txdir     = txrx;
571 
572 #if 0
573 	/* RMON clearing */
574 	s->sbe_idx =(s->sbm_base - A_MAC_BASE_0)/MAC_SPACING;
575 #endif
576 
577 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_BYTES);
578 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_COLLISIONS);
579 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_LATE_COL);
580 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_EX_COL);
581 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_FCS_ERROR);
582 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_ABORT);
583 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_BAD);
584 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_GOOD);
585 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_RUNT);
586 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_OVERSIZE);
587 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_BYTES);
588 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_MCAST);
589 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_BCAST);
590 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_BAD);
591 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_GOOD);
592 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_RUNT);
593 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_OVERSIZE);
594 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_FCS_ERROR);
595 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_LENGTH_ERROR);
596 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_CODE_ERROR);
597 	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_ALIGN_ERROR);
598 
599 	/*
600 	 * initialize register pointers
601 	 */
602 
603 	d->sbdma_config0 =
604 		s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CONFIG0);
605 	d->sbdma_config1 =
606 		s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CONFIG1);
607 	d->sbdma_dscrbase =
608 		s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_DSCR_BASE);
609 	d->sbdma_dscrcnt =
610 		s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_DSCR_CNT);
611 	d->sbdma_curdscr =
612 		s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CUR_DSCRADDR);
613 	if (d->sbdma_txdir)
614 		d->sbdma_oodpktlost = NULL;
615 	else
616 		d->sbdma_oodpktlost =
617 			s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_OODPKTLOST_RX);
618 
619 	/*
620 	 * Allocate memory for the ring
621 	 */
622 
623 	d->sbdma_maxdescr = maxdescr;
624 
625 	d->sbdma_dscrtable_unaligned = kcalloc(d->sbdma_maxdescr + 1,
626 					       sizeof(*d->sbdma_dscrtable),
627 					       GFP_KERNEL);
628 
629 	/*
630 	 * The descriptor table must be aligned to at least 16 bytes or the
631 	 * MAC will corrupt it.
632 	 */
633 	d->sbdma_dscrtable = (struct sbdmadscr *)
634 			     ALIGN((unsigned long)d->sbdma_dscrtable_unaligned,
635 				   sizeof(*d->sbdma_dscrtable));
636 
637 	d->sbdma_dscrtable_end = d->sbdma_dscrtable + d->sbdma_maxdescr;
638 
639 	d->sbdma_dscrtable_phys = virt_to_phys(d->sbdma_dscrtable);
640 
641 	/*
642 	 * And context table
643 	 */
644 
645 	d->sbdma_ctxtable = kcalloc(d->sbdma_maxdescr,
646 				    sizeof(*d->sbdma_ctxtable), GFP_KERNEL);
647 
648 #ifdef CONFIG_SBMAC_COALESCE
649 	/*
650 	 * Setup Rx/Tx DMA coalescing defaults
651 	 */
652 
653 	int_pktcnt = (txrx == DMA_TX) ? int_pktcnt_tx : int_pktcnt_rx;
654 	if ( int_pktcnt ) {
655 		d->sbdma_int_pktcnt = int_pktcnt;
656 	} else {
657 		d->sbdma_int_pktcnt = 1;
658 	}
659 
660 	int_timeout = (txrx == DMA_TX) ? int_timeout_tx : int_timeout_rx;
661 	if ( int_timeout ) {
662 		d->sbdma_int_timeout = int_timeout;
663 	} else {
664 		d->sbdma_int_timeout = 0;
665 	}
666 #endif
667 
668 }
669 
670 /**********************************************************************
671  *  SBDMA_CHANNEL_START(d)
672  *
673  *  Initialize the hardware registers for a DMA channel.
674  *
675  *  Input parameters:
676  *  	   d - DMA channel to init (context must be previously init'd
677  *         rxtx - DMA_RX or DMA_TX depending on what type of channel
678  *
679  *  Return value:
680  *  	   nothing
681  ********************************************************************* */
682 
sbdma_channel_start(struct sbmacdma * d,int rxtx)683 static void sbdma_channel_start(struct sbmacdma *d, int rxtx)
684 {
685 	/*
686 	 * Turn on the DMA channel
687 	 */
688 
689 #ifdef CONFIG_SBMAC_COALESCE
690 	__raw_writeq(V_DMA_INT_TIMEOUT(d->sbdma_int_timeout) |
691 		       0, d->sbdma_config1);
692 	__raw_writeq(M_DMA_EOP_INT_EN |
693 		       V_DMA_RINGSZ(d->sbdma_maxdescr) |
694 		       V_DMA_INT_PKTCNT(d->sbdma_int_pktcnt) |
695 		       0, d->sbdma_config0);
696 #else
697 	__raw_writeq(0, d->sbdma_config1);
698 	__raw_writeq(V_DMA_RINGSZ(d->sbdma_maxdescr) |
699 		       0, d->sbdma_config0);
700 #endif
701 
702 	__raw_writeq(d->sbdma_dscrtable_phys, d->sbdma_dscrbase);
703 
704 	/*
705 	 * Initialize ring pointers
706 	 */
707 
708 	d->sbdma_addptr = d->sbdma_dscrtable;
709 	d->sbdma_remptr = d->sbdma_dscrtable;
710 }
711 
712 /**********************************************************************
713  *  SBDMA_CHANNEL_STOP(d)
714  *
715  *  Initialize the hardware registers for a DMA channel.
716  *
717  *  Input parameters:
718  *  	   d - DMA channel to init (context must be previously init'd
719  *
720  *  Return value:
721  *  	   nothing
722  ********************************************************************* */
723 
sbdma_channel_stop(struct sbmacdma * d)724 static void sbdma_channel_stop(struct sbmacdma *d)
725 {
726 	/*
727 	 * Turn off the DMA channel
728 	 */
729 
730 	__raw_writeq(0, d->sbdma_config1);
731 
732 	__raw_writeq(0, d->sbdma_dscrbase);
733 
734 	__raw_writeq(0, d->sbdma_config0);
735 
736 	/*
737 	 * Zero ring pointers
738 	 */
739 
740 	d->sbdma_addptr = NULL;
741 	d->sbdma_remptr = NULL;
742 }
743 
sbdma_align_skb(struct sk_buff * skb,unsigned int power2,unsigned int offset)744 static inline void sbdma_align_skb(struct sk_buff *skb,
745 				   unsigned int power2, unsigned int offset)
746 {
747 	unsigned char *addr = skb->data;
748 	unsigned char *newaddr = PTR_ALIGN(addr, power2);
749 
750 	skb_reserve(skb, newaddr - addr + offset);
751 }
752 
753 
754 /**********************************************************************
755  *  SBDMA_ADD_RCVBUFFER(d,sb)
756  *
757  *  Add a buffer to the specified DMA channel.   For receive channels,
758  *  this queues a buffer for inbound packets.
759  *
760  *  Input parameters:
761  *	   sc - softc structure
762  *  	    d - DMA channel descriptor
763  * 	   sb - sk_buff to add, or NULL if we should allocate one
764  *
765  *  Return value:
766  *  	   0 if buffer could not be added (ring is full)
767  *  	   1 if buffer added successfully
768  ********************************************************************* */
769 
770 
sbdma_add_rcvbuffer(struct sbmac_softc * sc,struct sbmacdma * d,struct sk_buff * sb)771 static int sbdma_add_rcvbuffer(struct sbmac_softc *sc, struct sbmacdma *d,
772 			       struct sk_buff *sb)
773 {
774 	struct net_device *dev = sc->sbm_dev;
775 	struct sbdmadscr *dsc;
776 	struct sbdmadscr *nextdsc;
777 	struct sk_buff *sb_new = NULL;
778 	int pktsize = ENET_PACKET_SIZE;
779 
780 	/* get pointer to our current place in the ring */
781 
782 	dsc = d->sbdma_addptr;
783 	nextdsc = SBDMA_NEXTBUF(d,sbdma_addptr);
784 
785 	/*
786 	 * figure out if the ring is full - if the next descriptor
787 	 * is the same as the one that we're going to remove from
788 	 * the ring, the ring is full
789 	 */
790 
791 	if (nextdsc == d->sbdma_remptr) {
792 		return -ENOSPC;
793 	}
794 
795 	/*
796 	 * Allocate a sk_buff if we don't already have one.
797 	 * If we do have an sk_buff, reset it so that it's empty.
798 	 *
799 	 * Note: sk_buffs don't seem to be guaranteed to have any sort
800 	 * of alignment when they are allocated.  Therefore, allocate enough
801 	 * extra space to make sure that:
802 	 *
803 	 *    1. the data does not start in the middle of a cache line.
804 	 *    2. The data does not end in the middle of a cache line
805 	 *    3. The buffer can be aligned such that the IP addresses are
806 	 *       naturally aligned.
807 	 *
808 	 *  Remember, the SOCs MAC writes whole cache lines at a time,
809 	 *  without reading the old contents first.  So, if the sk_buff's
810 	 *  data portion starts in the middle of a cache line, the SOC
811 	 *  DMA will trash the beginning (and ending) portions.
812 	 */
813 
814 	if (sb == NULL) {
815 		sb_new = netdev_alloc_skb(dev, ENET_PACKET_SIZE +
816 					       SMP_CACHE_BYTES * 2 +
817 					       NET_IP_ALIGN);
818 		if (sb_new == NULL)
819 			return -ENOBUFS;
820 
821 		sbdma_align_skb(sb_new, SMP_CACHE_BYTES, NET_IP_ALIGN);
822 	}
823 	else {
824 		sb_new = sb;
825 		/*
826 		 * nothing special to reinit buffer, it's already aligned
827 		 * and sb->data already points to a good place.
828 		 */
829 	}
830 
831 	/*
832 	 * fill in the descriptor
833 	 */
834 
835 #ifdef CONFIG_SBMAC_COALESCE
836 	/*
837 	 * Do not interrupt per DMA transfer.
838 	 */
839 	dsc->dscr_a = virt_to_phys(sb_new->data) |
840 		V_DMA_DSCRA_A_SIZE(NUMCACHEBLKS(pktsize + NET_IP_ALIGN)) | 0;
841 #else
842 	dsc->dscr_a = virt_to_phys(sb_new->data) |
843 		V_DMA_DSCRA_A_SIZE(NUMCACHEBLKS(pktsize + NET_IP_ALIGN)) |
844 		M_DMA_DSCRA_INTERRUPT;
845 #endif
846 
847 	/* receiving: no options */
848 	dsc->dscr_b = 0;
849 
850 	/*
851 	 * fill in the context
852 	 */
853 
854 	d->sbdma_ctxtable[dsc-d->sbdma_dscrtable] = sb_new;
855 
856 	/*
857 	 * point at next packet
858 	 */
859 
860 	d->sbdma_addptr = nextdsc;
861 
862 	/*
863 	 * Give the buffer to the DMA engine.
864 	 */
865 
866 	__raw_writeq(1, d->sbdma_dscrcnt);
867 
868 	return 0;					/* we did it */
869 }
870 
871 /**********************************************************************
872  *  SBDMA_ADD_TXBUFFER(d,sb)
873  *
874  *  Add a transmit buffer to the specified DMA channel, causing a
875  *  transmit to start.
876  *
877  *  Input parameters:
878  *  	   d - DMA channel descriptor
879  * 	   sb - sk_buff to add
880  *
881  *  Return value:
882  *  	   0 transmit queued successfully
883  *  	   otherwise error code
884  ********************************************************************* */
885 
886 
sbdma_add_txbuffer(struct sbmacdma * d,struct sk_buff * sb)887 static int sbdma_add_txbuffer(struct sbmacdma *d, struct sk_buff *sb)
888 {
889 	struct sbdmadscr *dsc;
890 	struct sbdmadscr *nextdsc;
891 	uint64_t phys;
892 	uint64_t ncb;
893 	int length;
894 
895 	/* get pointer to our current place in the ring */
896 
897 	dsc = d->sbdma_addptr;
898 	nextdsc = SBDMA_NEXTBUF(d,sbdma_addptr);
899 
900 	/*
901 	 * figure out if the ring is full - if the next descriptor
902 	 * is the same as the one that we're going to remove from
903 	 * the ring, the ring is full
904 	 */
905 
906 	if (nextdsc == d->sbdma_remptr) {
907 		return -ENOSPC;
908 	}
909 
910 	/*
911 	 * Under Linux, it's not necessary to copy/coalesce buffers
912 	 * like it is on NetBSD.  We think they're all contiguous,
913 	 * but that may not be true for GBE.
914 	 */
915 
916 	length = sb->len;
917 
918 	/*
919 	 * fill in the descriptor.  Note that the number of cache
920 	 * blocks in the descriptor is the number of blocks
921 	 * *spanned*, so we need to add in the offset (if any)
922 	 * while doing the calculation.
923 	 */
924 
925 	phys = virt_to_phys(sb->data);
926 	ncb = NUMCACHEBLKS(length+(phys & (SMP_CACHE_BYTES - 1)));
927 
928 	dsc->dscr_a = phys |
929 		V_DMA_DSCRA_A_SIZE(ncb) |
930 #ifndef CONFIG_SBMAC_COALESCE
931 		M_DMA_DSCRA_INTERRUPT |
932 #endif
933 		M_DMA_ETHTX_SOP;
934 
935 	/* transmitting: set outbound options and length */
936 
937 	dsc->dscr_b = V_DMA_DSCRB_OPTIONS(K_DMA_ETHTX_APPENDCRC_APPENDPAD) |
938 		V_DMA_DSCRB_PKT_SIZE(length);
939 
940 	/*
941 	 * fill in the context
942 	 */
943 
944 	d->sbdma_ctxtable[dsc-d->sbdma_dscrtable] = sb;
945 
946 	/*
947 	 * point at next packet
948 	 */
949 
950 	d->sbdma_addptr = nextdsc;
951 
952 	/*
953 	 * Give the buffer to the DMA engine.
954 	 */
955 
956 	__raw_writeq(1, d->sbdma_dscrcnt);
957 
958 	return 0;					/* we did it */
959 }
960 
961 
962 
963 
964 /**********************************************************************
965  *  SBDMA_EMPTYRING(d)
966  *
967  *  Free all allocated sk_buffs on the specified DMA channel;
968  *
969  *  Input parameters:
970  *  	   d  - DMA channel
971  *
972  *  Return value:
973  *  	   nothing
974  ********************************************************************* */
975 
sbdma_emptyring(struct sbmacdma * d)976 static void sbdma_emptyring(struct sbmacdma *d)
977 {
978 	int idx;
979 	struct sk_buff *sb;
980 
981 	for (idx = 0; idx < d->sbdma_maxdescr; idx++) {
982 		sb = d->sbdma_ctxtable[idx];
983 		if (sb) {
984 			dev_kfree_skb(sb);
985 			d->sbdma_ctxtable[idx] = NULL;
986 		}
987 	}
988 }
989 
990 
991 /**********************************************************************
992  *  SBDMA_FILLRING(d)
993  *
994  *  Fill the specified DMA channel (must be receive channel)
995  *  with sk_buffs
996  *
997  *  Input parameters:
998  *	   sc - softc structure
999  *  	    d - DMA channel
1000  *
1001  *  Return value:
1002  *  	   nothing
1003  ********************************************************************* */
1004 
sbdma_fillring(struct sbmac_softc * sc,struct sbmacdma * d)1005 static void sbdma_fillring(struct sbmac_softc *sc, struct sbmacdma *d)
1006 {
1007 	int idx;
1008 
1009 	for (idx = 0; idx < SBMAC_MAX_RXDESCR - 1; idx++) {
1010 		if (sbdma_add_rcvbuffer(sc, d, NULL) != 0)
1011 			break;
1012 	}
1013 }
1014 
1015 #ifdef CONFIG_NET_POLL_CONTROLLER
sbmac_netpoll(struct net_device * netdev)1016 static void sbmac_netpoll(struct net_device *netdev)
1017 {
1018 	struct sbmac_softc *sc = netdev_priv(netdev);
1019 	int irq = sc->sbm_dev->irq;
1020 
1021 	__raw_writeq(0, sc->sbm_imr);
1022 
1023 	sbmac_intr(irq, netdev);
1024 
1025 #ifdef CONFIG_SBMAC_COALESCE
1026 	__raw_writeq(((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_TX_CH0) |
1027 	((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_RX_CH0),
1028 	sc->sbm_imr);
1029 #else
1030 	__raw_writeq((M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
1031 	(M_MAC_INT_CHANNEL << S_MAC_RX_CH0), sc->sbm_imr);
1032 #endif
1033 }
1034 #endif
1035 
1036 /**********************************************************************
1037  *  SBDMA_RX_PROCESS(sc,d,work_to_do,poll)
1038  *
1039  *  Process "completed" receive buffers on the specified DMA channel.
1040  *
1041  *  Input parameters:
1042  *            sc - softc structure
1043  *  	       d - DMA channel context
1044  *    work_to_do - no. of packets to process before enabling interrupt
1045  *                 again (for NAPI)
1046  *          poll - 1: using polling (for NAPI)
1047  *
1048  *  Return value:
1049  *  	   nothing
1050  ********************************************************************* */
1051 
sbdma_rx_process(struct sbmac_softc * sc,struct sbmacdma * d,int work_to_do,int poll)1052 static int sbdma_rx_process(struct sbmac_softc *sc, struct sbmacdma *d,
1053 			    int work_to_do, int poll)
1054 {
1055 	struct net_device *dev = sc->sbm_dev;
1056 	int curidx;
1057 	int hwidx;
1058 	struct sbdmadscr *dsc;
1059 	struct sk_buff *sb;
1060 	int len;
1061 	int work_done = 0;
1062 	int dropped = 0;
1063 
1064 	prefetch(d);
1065 
1066 again:
1067 	/* Check if the HW dropped any frames */
1068 	dev->stats.rx_fifo_errors
1069 	    += __raw_readq(sc->sbm_rxdma.sbdma_oodpktlost) & 0xffff;
1070 	__raw_writeq(0, sc->sbm_rxdma.sbdma_oodpktlost);
1071 
1072 	while (work_to_do-- > 0) {
1073 		/*
1074 		 * figure out where we are (as an index) and where
1075 		 * the hardware is (also as an index)
1076 		 *
1077 		 * This could be done faster if (for example) the
1078 		 * descriptor table was page-aligned and contiguous in
1079 		 * both virtual and physical memory -- you could then
1080 		 * just compare the low-order bits of the virtual address
1081 		 * (sbdma_remptr) and the physical address (sbdma_curdscr CSR)
1082 		 */
1083 
1084 		dsc = d->sbdma_remptr;
1085 		curidx = dsc - d->sbdma_dscrtable;
1086 
1087 		prefetch(dsc);
1088 		prefetch(&d->sbdma_ctxtable[curidx]);
1089 
1090 		hwidx = ((__raw_readq(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
1091 			 d->sbdma_dscrtable_phys) /
1092 			sizeof(*d->sbdma_dscrtable);
1093 
1094 		/*
1095 		 * If they're the same, that means we've processed all
1096 		 * of the descriptors up to (but not including) the one that
1097 		 * the hardware is working on right now.
1098 		 */
1099 
1100 		if (curidx == hwidx)
1101 			goto done;
1102 
1103 		/*
1104 		 * Otherwise, get the packet's sk_buff ptr back
1105 		 */
1106 
1107 		sb = d->sbdma_ctxtable[curidx];
1108 		d->sbdma_ctxtable[curidx] = NULL;
1109 
1110 		len = (int)G_DMA_DSCRB_PKT_SIZE(dsc->dscr_b) - 4;
1111 
1112 		/*
1113 		 * Check packet status.  If good, process it.
1114 		 * If not, silently drop it and put it back on the
1115 		 * receive ring.
1116 		 */
1117 
1118 		if (likely (!(dsc->dscr_a & M_DMA_ETHRX_BAD))) {
1119 
1120 			/*
1121 			 * Add a new buffer to replace the old one.  If we fail
1122 			 * to allocate a buffer, we're going to drop this
1123 			 * packet and put it right back on the receive ring.
1124 			 */
1125 
1126 			if (unlikely(sbdma_add_rcvbuffer(sc, d, NULL) ==
1127 				     -ENOBUFS)) {
1128 				dev->stats.rx_dropped++;
1129 				/* Re-add old buffer */
1130 				sbdma_add_rcvbuffer(sc, d, sb);
1131 				/* No point in continuing at the moment */
1132 				printk(KERN_ERR "dropped packet (1)\n");
1133 				d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
1134 				goto done;
1135 			} else {
1136 				/*
1137 				 * Set length into the packet
1138 				 */
1139 				skb_put(sb,len);
1140 
1141 				/*
1142 				 * Buffer has been replaced on the
1143 				 * receive ring.  Pass the buffer to
1144 				 * the kernel
1145 				 */
1146 				sb->protocol = eth_type_trans(sb,d->sbdma_eth->sbm_dev);
1147 				/* Check hw IPv4/TCP checksum if supported */
1148 				if (sc->rx_hw_checksum == ENABLE) {
1149 					if (!((dsc->dscr_a) & M_DMA_ETHRX_BADIP4CS) &&
1150 					    !((dsc->dscr_a) & M_DMA_ETHRX_BADTCPCS)) {
1151 						sb->ip_summed = CHECKSUM_UNNECESSARY;
1152 						/* don't need to set sb->csum */
1153 					} else {
1154 						skb_checksum_none_assert(sb);
1155 					}
1156 				}
1157 				prefetch(sb->data);
1158 				prefetch((const void *)(((char *)sb->data)+32));
1159 				if (poll)
1160 					dropped = netif_receive_skb(sb);
1161 				else
1162 					dropped = netif_rx(sb);
1163 
1164 				if (dropped == NET_RX_DROP) {
1165 					dev->stats.rx_dropped++;
1166 					d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
1167 					goto done;
1168 				}
1169 				else {
1170 					dev->stats.rx_bytes += len;
1171 					dev->stats.rx_packets++;
1172 				}
1173 			}
1174 		} else {
1175 			/*
1176 			 * Packet was mangled somehow.  Just drop it and
1177 			 * put it back on the receive ring.
1178 			 */
1179 			dev->stats.rx_errors++;
1180 			sbdma_add_rcvbuffer(sc, d, sb);
1181 		}
1182 
1183 
1184 		/*
1185 		 * .. and advance to the next buffer.
1186 		 */
1187 
1188 		d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
1189 		work_done++;
1190 	}
1191 	if (!poll) {
1192 		work_to_do = 32;
1193 		goto again; /* collect fifo drop statistics again */
1194 	}
1195 done:
1196 	return work_done;
1197 }
1198 
1199 /**********************************************************************
1200  *  SBDMA_TX_PROCESS(sc,d)
1201  *
1202  *  Process "completed" transmit buffers on the specified DMA channel.
1203  *  This is normally called within the interrupt service routine.
1204  *  Note that this isn't really ideal for priority channels, since
1205  *  it processes all of the packets on a given channel before
1206  *  returning.
1207  *
1208  *  Input parameters:
1209  *      sc - softc structure
1210  *  	 d - DMA channel context
1211  *    poll - 1: using polling (for NAPI)
1212  *
1213  *  Return value:
1214  *  	   nothing
1215  ********************************************************************* */
1216 
sbdma_tx_process(struct sbmac_softc * sc,struct sbmacdma * d,int poll)1217 static void sbdma_tx_process(struct sbmac_softc *sc, struct sbmacdma *d,
1218 			     int poll)
1219 {
1220 	struct net_device *dev = sc->sbm_dev;
1221 	int curidx;
1222 	int hwidx;
1223 	struct sbdmadscr *dsc;
1224 	struct sk_buff *sb;
1225 	unsigned long flags;
1226 	int packets_handled = 0;
1227 
1228 	spin_lock_irqsave(&(sc->sbm_lock), flags);
1229 
1230 	if (d->sbdma_remptr == d->sbdma_addptr)
1231 	  goto end_unlock;
1232 
1233 	hwidx = ((__raw_readq(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
1234 		 d->sbdma_dscrtable_phys) / sizeof(*d->sbdma_dscrtable);
1235 
1236 	for (;;) {
1237 		/*
1238 		 * figure out where we are (as an index) and where
1239 		 * the hardware is (also as an index)
1240 		 *
1241 		 * This could be done faster if (for example) the
1242 		 * descriptor table was page-aligned and contiguous in
1243 		 * both virtual and physical memory -- you could then
1244 		 * just compare the low-order bits of the virtual address
1245 		 * (sbdma_remptr) and the physical address (sbdma_curdscr CSR)
1246 		 */
1247 
1248 		curidx = d->sbdma_remptr - d->sbdma_dscrtable;
1249 
1250 		/*
1251 		 * If they're the same, that means we've processed all
1252 		 * of the descriptors up to (but not including) the one that
1253 		 * the hardware is working on right now.
1254 		 */
1255 
1256 		if (curidx == hwidx)
1257 			break;
1258 
1259 		/*
1260 		 * Otherwise, get the packet's sk_buff ptr back
1261 		 */
1262 
1263 		dsc = &(d->sbdma_dscrtable[curidx]);
1264 		sb = d->sbdma_ctxtable[curidx];
1265 		d->sbdma_ctxtable[curidx] = NULL;
1266 
1267 		/*
1268 		 * Stats
1269 		 */
1270 
1271 		dev->stats.tx_bytes += sb->len;
1272 		dev->stats.tx_packets++;
1273 
1274 		/*
1275 		 * for transmits, we just free buffers.
1276 		 */
1277 
1278 		dev_consume_skb_irq(sb);
1279 
1280 		/*
1281 		 * .. and advance to the next buffer.
1282 		 */
1283 
1284 		d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
1285 
1286 		packets_handled++;
1287 
1288 	}
1289 
1290 	/*
1291 	 * Decide if we should wake up the protocol or not.
1292 	 * Other drivers seem to do this when we reach a low
1293 	 * watermark on the transmit queue.
1294 	 */
1295 
1296 	if (packets_handled)
1297 		netif_wake_queue(d->sbdma_eth->sbm_dev);
1298 
1299 end_unlock:
1300 	spin_unlock_irqrestore(&(sc->sbm_lock), flags);
1301 
1302 }
1303 
1304 
1305 
1306 /**********************************************************************
1307  *  SBMAC_INITCTX(s)
1308  *
1309  *  Initialize an Ethernet context structure - this is called
1310  *  once per MAC on the 1250.  Memory is allocated here, so don't
1311  *  call it again from inside the ioctl routines that bring the
1312  *  interface up/down
1313  *
1314  *  Input parameters:
1315  *  	   s - sbmac context structure
1316  *
1317  *  Return value:
1318  *  	   0
1319  ********************************************************************* */
1320 
sbmac_initctx(struct sbmac_softc * s)1321 static int sbmac_initctx(struct sbmac_softc *s)
1322 {
1323 
1324 	/*
1325 	 * figure out the addresses of some ports
1326 	 */
1327 
1328 	s->sbm_macenable = s->sbm_base + R_MAC_ENABLE;
1329 	s->sbm_maccfg    = s->sbm_base + R_MAC_CFG;
1330 	s->sbm_fifocfg   = s->sbm_base + R_MAC_THRSH_CFG;
1331 	s->sbm_framecfg  = s->sbm_base + R_MAC_FRAMECFG;
1332 	s->sbm_rxfilter  = s->sbm_base + R_MAC_ADFILTER_CFG;
1333 	s->sbm_isr       = s->sbm_base + R_MAC_STATUS;
1334 	s->sbm_imr       = s->sbm_base + R_MAC_INT_MASK;
1335 	s->sbm_mdio      = s->sbm_base + R_MAC_MDIO;
1336 
1337 	/*
1338 	 * Initialize the DMA channels.  Right now, only one per MAC is used
1339 	 * Note: Only do this _once_, as it allocates memory from the kernel!
1340 	 */
1341 
1342 	sbdma_initctx(&(s->sbm_txdma),s,0,DMA_TX,SBMAC_MAX_TXDESCR);
1343 	sbdma_initctx(&(s->sbm_rxdma),s,0,DMA_RX,SBMAC_MAX_RXDESCR);
1344 
1345 	/*
1346 	 * initial state is OFF
1347 	 */
1348 
1349 	s->sbm_state = sbmac_state_off;
1350 
1351 	return 0;
1352 }
1353 
1354 
sbdma_uninitctx(struct sbmacdma * d)1355 static void sbdma_uninitctx(struct sbmacdma *d)
1356 {
1357 	kfree(d->sbdma_dscrtable_unaligned);
1358 	d->sbdma_dscrtable_unaligned = d->sbdma_dscrtable = NULL;
1359 
1360 	kfree(d->sbdma_ctxtable);
1361 	d->sbdma_ctxtable = NULL;
1362 }
1363 
1364 
sbmac_uninitctx(struct sbmac_softc * sc)1365 static void sbmac_uninitctx(struct sbmac_softc *sc)
1366 {
1367 	sbdma_uninitctx(&(sc->sbm_txdma));
1368 	sbdma_uninitctx(&(sc->sbm_rxdma));
1369 }
1370 
1371 
1372 /**********************************************************************
1373  *  SBMAC_CHANNEL_START(s)
1374  *
1375  *  Start packet processing on this MAC.
1376  *
1377  *  Input parameters:
1378  *  	   s - sbmac structure
1379  *
1380  *  Return value:
1381  *  	   nothing
1382  ********************************************************************* */
1383 
sbmac_channel_start(struct sbmac_softc * s)1384 static void sbmac_channel_start(struct sbmac_softc *s)
1385 {
1386 	uint64_t reg;
1387 	void __iomem *port;
1388 	uint64_t cfg,fifo,framecfg;
1389 	int idx, th_value;
1390 
1391 	/*
1392 	 * Don't do this if running
1393 	 */
1394 
1395 	if (s->sbm_state == sbmac_state_on)
1396 		return;
1397 
1398 	/*
1399 	 * Bring the controller out of reset, but leave it off.
1400 	 */
1401 
1402 	__raw_writeq(0, s->sbm_macenable);
1403 
1404 	/*
1405 	 * Ignore all received packets
1406 	 */
1407 
1408 	__raw_writeq(0, s->sbm_rxfilter);
1409 
1410 	/*
1411 	 * Calculate values for various control registers.
1412 	 */
1413 
1414 	cfg = M_MAC_RETRY_EN |
1415 		M_MAC_TX_HOLD_SOP_EN |
1416 		V_MAC_TX_PAUSE_CNT_16K |
1417 		M_MAC_AP_STAT_EN |
1418 		M_MAC_FAST_SYNC |
1419 		M_MAC_SS_EN |
1420 		0;
1421 
1422 	/*
1423 	 * Be sure that RD_THRSH+WR_THRSH <= 32 for pass1 pars
1424 	 * and make sure that RD_THRSH + WR_THRSH <=128 for pass2 and above
1425 	 * Use a larger RD_THRSH for gigabit
1426 	 */
1427 	if (soc_type == K_SYS_SOC_TYPE_BCM1250 && periph_rev < 2)
1428 		th_value = 28;
1429 	else
1430 		th_value = 64;
1431 
1432 	fifo = V_MAC_TX_WR_THRSH(4) |	/* Must be '4' or '8' */
1433 		((s->sbm_speed == sbmac_speed_1000)
1434 		 ? V_MAC_TX_RD_THRSH(th_value) : V_MAC_TX_RD_THRSH(4)) |
1435 		V_MAC_TX_RL_THRSH(4) |
1436 		V_MAC_RX_PL_THRSH(4) |
1437 		V_MAC_RX_RD_THRSH(4) |	/* Must be '4' */
1438 		V_MAC_RX_RL_THRSH(8) |
1439 		0;
1440 
1441 	framecfg = V_MAC_MIN_FRAMESZ_DEFAULT |
1442 		V_MAC_MAX_FRAMESZ_DEFAULT |
1443 		V_MAC_BACKOFF_SEL(1);
1444 
1445 	/*
1446 	 * Clear out the hash address map
1447 	 */
1448 
1449 	port = s->sbm_base + R_MAC_HASH_BASE;
1450 	for (idx = 0; idx < MAC_HASH_COUNT; idx++) {
1451 		__raw_writeq(0, port);
1452 		port += sizeof(uint64_t);
1453 	}
1454 
1455 	/*
1456 	 * Clear out the exact-match table
1457 	 */
1458 
1459 	port = s->sbm_base + R_MAC_ADDR_BASE;
1460 	for (idx = 0; idx < MAC_ADDR_COUNT; idx++) {
1461 		__raw_writeq(0, port);
1462 		port += sizeof(uint64_t);
1463 	}
1464 
1465 	/*
1466 	 * Clear out the DMA Channel mapping table registers
1467 	 */
1468 
1469 	port = s->sbm_base + R_MAC_CHUP0_BASE;
1470 	for (idx = 0; idx < MAC_CHMAP_COUNT; idx++) {
1471 		__raw_writeq(0, port);
1472 		port += sizeof(uint64_t);
1473 	}
1474 
1475 
1476 	port = s->sbm_base + R_MAC_CHLO0_BASE;
1477 	for (idx = 0; idx < MAC_CHMAP_COUNT; idx++) {
1478 		__raw_writeq(0, port);
1479 		port += sizeof(uint64_t);
1480 	}
1481 
1482 	/*
1483 	 * Program the hardware address.  It goes into the hardware-address
1484 	 * register as well as the first filter register.
1485 	 */
1486 
1487 	reg = sbmac_addr2reg(s->sbm_hwaddr);
1488 
1489 	port = s->sbm_base + R_MAC_ADDR_BASE;
1490 	__raw_writeq(reg, port);
1491 	port = s->sbm_base + R_MAC_ETHERNET_ADDR;
1492 
1493 	__raw_writeq(reg, port);
1494 
1495 	/*
1496 	 * Set the receive filter for no packets, and write values
1497 	 * to the various config registers
1498 	 */
1499 
1500 	__raw_writeq(0, s->sbm_rxfilter);
1501 	__raw_writeq(0, s->sbm_imr);
1502 	__raw_writeq(framecfg, s->sbm_framecfg);
1503 	__raw_writeq(fifo, s->sbm_fifocfg);
1504 	__raw_writeq(cfg, s->sbm_maccfg);
1505 
1506 	/*
1507 	 * Initialize DMA channels (rings should be ok now)
1508 	 */
1509 
1510 	sbdma_channel_start(&(s->sbm_rxdma), DMA_RX);
1511 	sbdma_channel_start(&(s->sbm_txdma), DMA_TX);
1512 
1513 	/*
1514 	 * Configure the speed, duplex, and flow control
1515 	 */
1516 
1517 	sbmac_set_speed(s,s->sbm_speed);
1518 	sbmac_set_duplex(s,s->sbm_duplex,s->sbm_fc);
1519 
1520 	/*
1521 	 * Fill the receive ring
1522 	 */
1523 
1524 	sbdma_fillring(s, &(s->sbm_rxdma));
1525 
1526 	/*
1527 	 * Turn on the rest of the bits in the enable register
1528 	 */
1529 
1530 #if defined(CONFIG_SIBYTE_BCM1x80)
1531 	__raw_writeq(M_MAC_RXDMA_EN0 |
1532 		       M_MAC_TXDMA_EN0, s->sbm_macenable);
1533 #elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
1534 	__raw_writeq(M_MAC_RXDMA_EN0 |
1535 		       M_MAC_TXDMA_EN0 |
1536 		       M_MAC_RX_ENABLE |
1537 		       M_MAC_TX_ENABLE, s->sbm_macenable);
1538 #else
1539 #error invalid SiByte MAC configuration
1540 #endif
1541 
1542 #ifdef CONFIG_SBMAC_COALESCE
1543 	__raw_writeq(((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_TX_CH0) |
1544 		       ((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_RX_CH0), s->sbm_imr);
1545 #else
1546 	__raw_writeq((M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
1547 		       (M_MAC_INT_CHANNEL << S_MAC_RX_CH0), s->sbm_imr);
1548 #endif
1549 
1550 	/*
1551 	 * Enable receiving unicasts and broadcasts
1552 	 */
1553 
1554 	__raw_writeq(M_MAC_UCAST_EN | M_MAC_BCAST_EN, s->sbm_rxfilter);
1555 
1556 	/*
1557 	 * we're running now.
1558 	 */
1559 
1560 	s->sbm_state = sbmac_state_on;
1561 
1562 	/*
1563 	 * Program multicast addresses
1564 	 */
1565 
1566 	sbmac_setmulti(s);
1567 
1568 	/*
1569 	 * If channel was in promiscuous mode before, turn that on
1570 	 */
1571 
1572 	if (s->sbm_devflags & IFF_PROMISC) {
1573 		sbmac_promiscuous_mode(s,1);
1574 	}
1575 
1576 }
1577 
1578 
1579 /**********************************************************************
1580  *  SBMAC_CHANNEL_STOP(s)
1581  *
1582  *  Stop packet processing on this MAC.
1583  *
1584  *  Input parameters:
1585  *  	   s - sbmac structure
1586  *
1587  *  Return value:
1588  *  	   nothing
1589  ********************************************************************* */
1590 
sbmac_channel_stop(struct sbmac_softc * s)1591 static void sbmac_channel_stop(struct sbmac_softc *s)
1592 {
1593 	/* don't do this if already stopped */
1594 
1595 	if (s->sbm_state == sbmac_state_off)
1596 		return;
1597 
1598 	/* don't accept any packets, disable all interrupts */
1599 
1600 	__raw_writeq(0, s->sbm_rxfilter);
1601 	__raw_writeq(0, s->sbm_imr);
1602 
1603 	/* Turn off ticker */
1604 
1605 	/* XXX */
1606 
1607 	/* turn off receiver and transmitter */
1608 
1609 	__raw_writeq(0, s->sbm_macenable);
1610 
1611 	/* We're stopped now. */
1612 
1613 	s->sbm_state = sbmac_state_off;
1614 
1615 	/*
1616 	 * Stop DMA channels (rings should be ok now)
1617 	 */
1618 
1619 	sbdma_channel_stop(&(s->sbm_rxdma));
1620 	sbdma_channel_stop(&(s->sbm_txdma));
1621 
1622 	/* Empty the receive and transmit rings */
1623 
1624 	sbdma_emptyring(&(s->sbm_rxdma));
1625 	sbdma_emptyring(&(s->sbm_txdma));
1626 
1627 }
1628 
1629 /**********************************************************************
1630  *  SBMAC_SET_CHANNEL_STATE(state)
1631  *
1632  *  Set the channel's state ON or OFF
1633  *
1634  *  Input parameters:
1635  *  	   state - new state
1636  *
1637  *  Return value:
1638  *  	   old state
1639  ********************************************************************* */
sbmac_set_channel_state(struct sbmac_softc * sc,enum sbmac_state state)1640 static enum sbmac_state sbmac_set_channel_state(struct sbmac_softc *sc,
1641 						enum sbmac_state state)
1642 {
1643 	enum sbmac_state oldstate = sc->sbm_state;
1644 
1645 	/*
1646 	 * If same as previous state, return
1647 	 */
1648 
1649 	if (state == oldstate) {
1650 		return oldstate;
1651 	}
1652 
1653 	/*
1654 	 * If new state is ON, turn channel on
1655 	 */
1656 
1657 	if (state == sbmac_state_on) {
1658 		sbmac_channel_start(sc);
1659 	}
1660 	else {
1661 		sbmac_channel_stop(sc);
1662 	}
1663 
1664 	/*
1665 	 * Return previous state
1666 	 */
1667 
1668 	return oldstate;
1669 }
1670 
1671 
1672 /**********************************************************************
1673  *  SBMAC_PROMISCUOUS_MODE(sc,onoff)
1674  *
1675  *  Turn on or off promiscuous mode
1676  *
1677  *  Input parameters:
1678  *  	   sc - softc
1679  *      onoff - 1 to turn on, 0 to turn off
1680  *
1681  *  Return value:
1682  *  	   nothing
1683  ********************************************************************* */
1684 
sbmac_promiscuous_mode(struct sbmac_softc * sc,int onoff)1685 static void sbmac_promiscuous_mode(struct sbmac_softc *sc,int onoff)
1686 {
1687 	uint64_t reg;
1688 
1689 	if (sc->sbm_state != sbmac_state_on)
1690 		return;
1691 
1692 	if (onoff) {
1693 		reg = __raw_readq(sc->sbm_rxfilter);
1694 		reg |= M_MAC_ALLPKT_EN;
1695 		__raw_writeq(reg, sc->sbm_rxfilter);
1696 	}
1697 	else {
1698 		reg = __raw_readq(sc->sbm_rxfilter);
1699 		reg &= ~M_MAC_ALLPKT_EN;
1700 		__raw_writeq(reg, sc->sbm_rxfilter);
1701 	}
1702 }
1703 
1704 /**********************************************************************
1705  *  SBMAC_SETIPHDR_OFFSET(sc,onoff)
1706  *
1707  *  Set the iphdr offset as 15 assuming ethernet encapsulation
1708  *
1709  *  Input parameters:
1710  *  	   sc - softc
1711  *
1712  *  Return value:
1713  *  	   nothing
1714  ********************************************************************* */
1715 
sbmac_set_iphdr_offset(struct sbmac_softc * sc)1716 static void sbmac_set_iphdr_offset(struct sbmac_softc *sc)
1717 {
1718 	uint64_t reg;
1719 
1720 	/* Hard code the off set to 15 for now */
1721 	reg = __raw_readq(sc->sbm_rxfilter);
1722 	reg &= ~M_MAC_IPHDR_OFFSET | V_MAC_IPHDR_OFFSET(15);
1723 	__raw_writeq(reg, sc->sbm_rxfilter);
1724 
1725 	/* BCM1250 pass1 didn't have hardware checksum.  Everything
1726 	   later does.  */
1727 	if (soc_type == K_SYS_SOC_TYPE_BCM1250 && periph_rev < 2) {
1728 		sc->rx_hw_checksum = DISABLE;
1729 	} else {
1730 		sc->rx_hw_checksum = ENABLE;
1731 	}
1732 }
1733 
1734 
1735 /**********************************************************************
1736  *  SBMAC_ADDR2REG(ptr)
1737  *
1738  *  Convert six bytes into the 64-bit register value that
1739  *  we typically write into the SBMAC's address/mcast registers
1740  *
1741  *  Input parameters:
1742  *  	   ptr - pointer to 6 bytes
1743  *
1744  *  Return value:
1745  *  	   register value
1746  ********************************************************************* */
1747 
sbmac_addr2reg(unsigned char * ptr)1748 static uint64_t sbmac_addr2reg(unsigned char *ptr)
1749 {
1750 	uint64_t reg = 0;
1751 
1752 	ptr += 6;
1753 
1754 	reg |= (uint64_t) *(--ptr);
1755 	reg <<= 8;
1756 	reg |= (uint64_t) *(--ptr);
1757 	reg <<= 8;
1758 	reg |= (uint64_t) *(--ptr);
1759 	reg <<= 8;
1760 	reg |= (uint64_t) *(--ptr);
1761 	reg <<= 8;
1762 	reg |= (uint64_t) *(--ptr);
1763 	reg <<= 8;
1764 	reg |= (uint64_t) *(--ptr);
1765 
1766 	return reg;
1767 }
1768 
1769 
1770 /**********************************************************************
1771  *  SBMAC_SET_SPEED(s,speed)
1772  *
1773  *  Configure LAN speed for the specified MAC.
1774  *  Warning: must be called when MAC is off!
1775  *
1776  *  Input parameters:
1777  *  	   s - sbmac structure
1778  *  	   speed - speed to set MAC to (see enum sbmac_speed)
1779  *
1780  *  Return value:
1781  *  	   1 if successful
1782  *      0 indicates invalid parameters
1783  ********************************************************************* */
1784 
sbmac_set_speed(struct sbmac_softc * s,enum sbmac_speed speed)1785 static int sbmac_set_speed(struct sbmac_softc *s, enum sbmac_speed speed)
1786 {
1787 	uint64_t cfg;
1788 	uint64_t framecfg;
1789 
1790 	/*
1791 	 * Save new current values
1792 	 */
1793 
1794 	s->sbm_speed = speed;
1795 
1796 	if (s->sbm_state == sbmac_state_on)
1797 		return 0;	/* save for next restart */
1798 
1799 	/*
1800 	 * Read current register values
1801 	 */
1802 
1803 	cfg = __raw_readq(s->sbm_maccfg);
1804 	framecfg = __raw_readq(s->sbm_framecfg);
1805 
1806 	/*
1807 	 * Mask out the stuff we want to change
1808 	 */
1809 
1810 	cfg &= ~(M_MAC_BURST_EN | M_MAC_SPEED_SEL);
1811 	framecfg &= ~(M_MAC_IFG_RX | M_MAC_IFG_TX | M_MAC_IFG_THRSH |
1812 		      M_MAC_SLOT_SIZE);
1813 
1814 	/*
1815 	 * Now add in the new bits
1816 	 */
1817 
1818 	switch (speed) {
1819 	case sbmac_speed_10:
1820 		framecfg |= V_MAC_IFG_RX_10 |
1821 			V_MAC_IFG_TX_10 |
1822 			K_MAC_IFG_THRSH_10 |
1823 			V_MAC_SLOT_SIZE_10;
1824 		cfg |= V_MAC_SPEED_SEL_10MBPS;
1825 		break;
1826 
1827 	case sbmac_speed_100:
1828 		framecfg |= V_MAC_IFG_RX_100 |
1829 			V_MAC_IFG_TX_100 |
1830 			V_MAC_IFG_THRSH_100 |
1831 			V_MAC_SLOT_SIZE_100;
1832 		cfg |= V_MAC_SPEED_SEL_100MBPS ;
1833 		break;
1834 
1835 	case sbmac_speed_1000:
1836 		framecfg |= V_MAC_IFG_RX_1000 |
1837 			V_MAC_IFG_TX_1000 |
1838 			V_MAC_IFG_THRSH_1000 |
1839 			V_MAC_SLOT_SIZE_1000;
1840 		cfg |= V_MAC_SPEED_SEL_1000MBPS | M_MAC_BURST_EN;
1841 		break;
1842 
1843 	default:
1844 		return 0;
1845 	}
1846 
1847 	/*
1848 	 * Send the bits back to the hardware
1849 	 */
1850 
1851 	__raw_writeq(framecfg, s->sbm_framecfg);
1852 	__raw_writeq(cfg, s->sbm_maccfg);
1853 
1854 	return 1;
1855 }
1856 
1857 /**********************************************************************
1858  *  SBMAC_SET_DUPLEX(s,duplex,fc)
1859  *
1860  *  Set Ethernet duplex and flow control options for this MAC
1861  *  Warning: must be called when MAC is off!
1862  *
1863  *  Input parameters:
1864  *  	   s - sbmac structure
1865  *  	   duplex - duplex setting (see enum sbmac_duplex)
1866  *  	   fc - flow control setting (see enum sbmac_fc)
1867  *
1868  *  Return value:
1869  *  	   1 if ok
1870  *  	   0 if an invalid parameter combination was specified
1871  ********************************************************************* */
1872 
sbmac_set_duplex(struct sbmac_softc * s,enum sbmac_duplex duplex,enum sbmac_fc fc)1873 static int sbmac_set_duplex(struct sbmac_softc *s, enum sbmac_duplex duplex,
1874 			    enum sbmac_fc fc)
1875 {
1876 	uint64_t cfg;
1877 
1878 	/*
1879 	 * Save new current values
1880 	 */
1881 
1882 	s->sbm_duplex = duplex;
1883 	s->sbm_fc = fc;
1884 
1885 	if (s->sbm_state == sbmac_state_on)
1886 		return 0;	/* save for next restart */
1887 
1888 	/*
1889 	 * Read current register values
1890 	 */
1891 
1892 	cfg = __raw_readq(s->sbm_maccfg);
1893 
1894 	/*
1895 	 * Mask off the stuff we're about to change
1896 	 */
1897 
1898 	cfg &= ~(M_MAC_FC_SEL | M_MAC_FC_CMD | M_MAC_HDX_EN);
1899 
1900 
1901 	switch (duplex) {
1902 	case sbmac_duplex_half:
1903 		switch (fc) {
1904 		case sbmac_fc_disabled:
1905 			cfg |= M_MAC_HDX_EN | V_MAC_FC_CMD_DISABLED;
1906 			break;
1907 
1908 		case sbmac_fc_collision:
1909 			cfg |= M_MAC_HDX_EN | V_MAC_FC_CMD_ENABLED;
1910 			break;
1911 
1912 		case sbmac_fc_carrier:
1913 			cfg |= M_MAC_HDX_EN | V_MAC_FC_CMD_ENAB_FALSECARR;
1914 			break;
1915 
1916 		case sbmac_fc_frame:		/* not valid in half duplex */
1917 		default:			/* invalid selection */
1918 			return 0;
1919 		}
1920 		break;
1921 
1922 	case sbmac_duplex_full:
1923 		switch (fc) {
1924 		case sbmac_fc_disabled:
1925 			cfg |= V_MAC_FC_CMD_DISABLED;
1926 			break;
1927 
1928 		case sbmac_fc_frame:
1929 			cfg |= V_MAC_FC_CMD_ENABLED;
1930 			break;
1931 
1932 		case sbmac_fc_collision:	/* not valid in full duplex */
1933 		case sbmac_fc_carrier:		/* not valid in full duplex */
1934 		default:
1935 			return 0;
1936 		}
1937 		break;
1938 	default:
1939 		return 0;
1940 	}
1941 
1942 	/*
1943 	 * Send the bits back to the hardware
1944 	 */
1945 
1946 	__raw_writeq(cfg, s->sbm_maccfg);
1947 
1948 	return 1;
1949 }
1950 
1951 
1952 
1953 
1954 /**********************************************************************
1955  *  SBMAC_INTR()
1956  *
1957  *  Interrupt handler for MAC interrupts
1958  *
1959  *  Input parameters:
1960  *  	   MAC structure
1961  *
1962  *  Return value:
1963  *  	   nothing
1964  ********************************************************************* */
sbmac_intr(int irq,void * dev_instance)1965 static irqreturn_t sbmac_intr(int irq,void *dev_instance)
1966 {
1967 	struct net_device *dev = (struct net_device *) dev_instance;
1968 	struct sbmac_softc *sc = netdev_priv(dev);
1969 	uint64_t isr;
1970 	int handled = 0;
1971 
1972 	/*
1973 	 * Read the ISR (this clears the bits in the real
1974 	 * register, except for counter addr)
1975 	 */
1976 
1977 	isr = __raw_readq(sc->sbm_isr) & ~M_MAC_COUNTER_ADDR;
1978 
1979 	if (isr == 0)
1980 		return IRQ_RETVAL(0);
1981 	handled = 1;
1982 
1983 	/*
1984 	 * Transmits on channel 0
1985 	 */
1986 
1987 	if (isr & (M_MAC_INT_CHANNEL << S_MAC_TX_CH0))
1988 		sbdma_tx_process(sc,&(sc->sbm_txdma), 0);
1989 
1990 	if (isr & (M_MAC_INT_CHANNEL << S_MAC_RX_CH0)) {
1991 		if (napi_schedule_prep(&sc->napi)) {
1992 			__raw_writeq(0, sc->sbm_imr);
1993 			__napi_schedule(&sc->napi);
1994 			/* Depend on the exit from poll to reenable intr */
1995 		}
1996 		else {
1997 			/* may leave some packets behind */
1998 			sbdma_rx_process(sc,&(sc->sbm_rxdma),
1999 					 SBMAC_MAX_RXDESCR * 2, 0);
2000 		}
2001 	}
2002 	return IRQ_RETVAL(handled);
2003 }
2004 
2005 /**********************************************************************
2006  *  SBMAC_START_TX(skb,dev)
2007  *
2008  *  Start output on the specified interface.  Basically, we
2009  *  queue as many buffers as we can until the ring fills up, or
2010  *  we run off the end of the queue, whichever comes first.
2011  *
2012  *  Input parameters:
2013  *
2014  *
2015  *  Return value:
2016  *  	   nothing
2017  ********************************************************************* */
sbmac_start_tx(struct sk_buff * skb,struct net_device * dev)2018 static netdev_tx_t sbmac_start_tx(struct sk_buff *skb, struct net_device *dev)
2019 {
2020 	struct sbmac_softc *sc = netdev_priv(dev);
2021 	unsigned long flags;
2022 
2023 	/* lock eth irq */
2024 	spin_lock_irqsave(&sc->sbm_lock, flags);
2025 
2026 	/*
2027 	 * Put the buffer on the transmit ring.  If we
2028 	 * don't have room, stop the queue.
2029 	 */
2030 
2031 	if (sbdma_add_txbuffer(&(sc->sbm_txdma),skb)) {
2032 		/* XXX save skb that we could not send */
2033 		netif_stop_queue(dev);
2034 		spin_unlock_irqrestore(&sc->sbm_lock, flags);
2035 
2036 		return NETDEV_TX_BUSY;
2037 	}
2038 
2039 	spin_unlock_irqrestore(&sc->sbm_lock, flags);
2040 
2041 	return NETDEV_TX_OK;
2042 }
2043 
2044 /**********************************************************************
2045  *  SBMAC_SETMULTI(sc)
2046  *
2047  *  Reprogram the multicast table into the hardware, given
2048  *  the list of multicasts associated with the interface
2049  *  structure.
2050  *
2051  *  Input parameters:
2052  *  	   sc - softc
2053  *
2054  *  Return value:
2055  *  	   nothing
2056  ********************************************************************* */
2057 
sbmac_setmulti(struct sbmac_softc * sc)2058 static void sbmac_setmulti(struct sbmac_softc *sc)
2059 {
2060 	uint64_t reg;
2061 	void __iomem *port;
2062 	int idx;
2063 	struct netdev_hw_addr *ha;
2064 	struct net_device *dev = sc->sbm_dev;
2065 
2066 	/*
2067 	 * Clear out entire multicast table.  We do this by nuking
2068 	 * the entire hash table and all the direct matches except
2069 	 * the first one, which is used for our station address
2070 	 */
2071 
2072 	for (idx = 1; idx < MAC_ADDR_COUNT; idx++) {
2073 		port = sc->sbm_base + R_MAC_ADDR_BASE+(idx*sizeof(uint64_t));
2074 		__raw_writeq(0, port);
2075 	}
2076 
2077 	for (idx = 0; idx < MAC_HASH_COUNT; idx++) {
2078 		port = sc->sbm_base + R_MAC_HASH_BASE+(idx*sizeof(uint64_t));
2079 		__raw_writeq(0, port);
2080 	}
2081 
2082 	/*
2083 	 * Clear the filter to say we don't want any multicasts.
2084 	 */
2085 
2086 	reg = __raw_readq(sc->sbm_rxfilter);
2087 	reg &= ~(M_MAC_MCAST_INV | M_MAC_MCAST_EN);
2088 	__raw_writeq(reg, sc->sbm_rxfilter);
2089 
2090 	if (dev->flags & IFF_ALLMULTI) {
2091 		/*
2092 		 * Enable ALL multicasts.  Do this by inverting the
2093 		 * multicast enable bit.
2094 		 */
2095 		reg = __raw_readq(sc->sbm_rxfilter);
2096 		reg |= (M_MAC_MCAST_INV | M_MAC_MCAST_EN);
2097 		__raw_writeq(reg, sc->sbm_rxfilter);
2098 		return;
2099 	}
2100 
2101 
2102 	/*
2103 	 * Progam new multicast entries.  For now, only use the
2104 	 * perfect filter.  In the future we'll need to use the
2105 	 * hash filter if the perfect filter overflows
2106 	 */
2107 
2108 	/* XXX only using perfect filter for now, need to use hash
2109 	 * XXX if the table overflows */
2110 
2111 	idx = 1;		/* skip station address */
2112 	netdev_for_each_mc_addr(ha, dev) {
2113 		if (idx == MAC_ADDR_COUNT)
2114 			break;
2115 		reg = sbmac_addr2reg(ha->addr);
2116 		port = sc->sbm_base + R_MAC_ADDR_BASE+(idx * sizeof(uint64_t));
2117 		__raw_writeq(reg, port);
2118 		idx++;
2119 	}
2120 
2121 	/*
2122 	 * Enable the "accept multicast bits" if we programmed at least one
2123 	 * multicast.
2124 	 */
2125 
2126 	if (idx > 1) {
2127 		reg = __raw_readq(sc->sbm_rxfilter);
2128 		reg |= M_MAC_MCAST_EN;
2129 		__raw_writeq(reg, sc->sbm_rxfilter);
2130 	}
2131 }
2132 
2133 static const struct net_device_ops sbmac_netdev_ops = {
2134 	.ndo_open		= sbmac_open,
2135 	.ndo_stop		= sbmac_close,
2136 	.ndo_start_xmit		= sbmac_start_tx,
2137 	.ndo_set_rx_mode	= sbmac_set_rx_mode,
2138 	.ndo_tx_timeout		= sbmac_tx_timeout,
2139 	.ndo_eth_ioctl		= sbmac_mii_ioctl,
2140 	.ndo_validate_addr	= eth_validate_addr,
2141 	.ndo_set_mac_address	= eth_mac_addr,
2142 #ifdef CONFIG_NET_POLL_CONTROLLER
2143 	.ndo_poll_controller	= sbmac_netpoll,
2144 #endif
2145 };
2146 
2147 /**********************************************************************
2148  *  SBMAC_INIT(dev)
2149  *
2150  *  Attach routine - init hardware and hook ourselves into linux
2151  *
2152  *  Input parameters:
2153  *  	   dev - net_device structure
2154  *
2155  *  Return value:
2156  *  	   status
2157  ********************************************************************* */
2158 
sbmac_init(struct platform_device * pldev,long long base)2159 static int sbmac_init(struct platform_device *pldev, long long base)
2160 {
2161 	struct net_device *dev = platform_get_drvdata(pldev);
2162 	int idx = pldev->id;
2163 	struct sbmac_softc *sc = netdev_priv(dev);
2164 	unsigned char *eaddr;
2165 	uint64_t ea_reg;
2166 	int i;
2167 	int err;
2168 
2169 	sc->sbm_dev = dev;
2170 	sc->sbe_idx = idx;
2171 
2172 	eaddr = sc->sbm_hwaddr;
2173 
2174 	/*
2175 	 * Read the ethernet address.  The firmware left this programmed
2176 	 * for us in the ethernet address register for each mac.
2177 	 */
2178 
2179 	ea_reg = __raw_readq(sc->sbm_base + R_MAC_ETHERNET_ADDR);
2180 	__raw_writeq(0, sc->sbm_base + R_MAC_ETHERNET_ADDR);
2181 	for (i = 0; i < 6; i++) {
2182 		eaddr[i] = (uint8_t) (ea_reg & 0xFF);
2183 		ea_reg >>= 8;
2184 	}
2185 
2186 	eth_hw_addr_set(dev, eaddr);
2187 
2188 	/*
2189 	 * Initialize context (get pointers to registers and stuff), then
2190 	 * allocate the memory for the descriptor tables.
2191 	 */
2192 
2193 	sbmac_initctx(sc);
2194 
2195 	/*
2196 	 * Set up Linux device callins
2197 	 */
2198 
2199 	spin_lock_init(&(sc->sbm_lock));
2200 
2201 	dev->netdev_ops = &sbmac_netdev_ops;
2202 	dev->watchdog_timeo = TX_TIMEOUT;
2203 	dev->min_mtu = 0;
2204 	dev->max_mtu = ENET_PACKET_SIZE;
2205 
2206 	netif_napi_add_weight(dev, &sc->napi, sbmac_poll, 16);
2207 
2208 	dev->irq		= UNIT_INT(idx);
2209 
2210 	/* This is needed for PASS2 for Rx H/W checksum feature */
2211 	sbmac_set_iphdr_offset(sc);
2212 
2213 	sc->mii_bus = mdiobus_alloc();
2214 	if (sc->mii_bus == NULL) {
2215 		err = -ENOMEM;
2216 		goto uninit_ctx;
2217 	}
2218 
2219 	sc->mii_bus->name = sbmac_mdio_string;
2220 	snprintf(sc->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
2221 		pldev->name, idx);
2222 	sc->mii_bus->priv = sc;
2223 	sc->mii_bus->read = sbmac_mii_read;
2224 	sc->mii_bus->write = sbmac_mii_write;
2225 
2226 	sc->mii_bus->parent = &pldev->dev;
2227 	/*
2228 	 * Probe PHY address
2229 	 */
2230 	err = mdiobus_register(sc->mii_bus);
2231 	if (err) {
2232 		printk(KERN_ERR "%s: unable to register MDIO bus\n",
2233 		       dev->name);
2234 		goto free_mdio;
2235 	}
2236 	platform_set_drvdata(pldev, sc->mii_bus);
2237 
2238 	err = register_netdev(dev);
2239 	if (err) {
2240 		printk(KERN_ERR "%s.%d: unable to register netdev\n",
2241 		       sbmac_string, idx);
2242 		goto unreg_mdio;
2243 	}
2244 
2245 	pr_info("%s.%d: registered as %s\n", sbmac_string, idx, dev->name);
2246 
2247 	if (sc->rx_hw_checksum == ENABLE)
2248 		pr_info("%s: enabling TCP rcv checksum\n", dev->name);
2249 
2250 	/*
2251 	 * Display Ethernet address (this is called during the config
2252 	 * process so we need to finish off the config message that
2253 	 * was being displayed)
2254 	 */
2255 	pr_info("%s: SiByte Ethernet at 0x%08Lx, address: %pM\n",
2256 	       dev->name, base, eaddr);
2257 
2258 	return 0;
2259 unreg_mdio:
2260 	mdiobus_unregister(sc->mii_bus);
2261 free_mdio:
2262 	mdiobus_free(sc->mii_bus);
2263 uninit_ctx:
2264 	sbmac_uninitctx(sc);
2265 	return err;
2266 }
2267 
2268 
sbmac_open(struct net_device * dev)2269 static int sbmac_open(struct net_device *dev)
2270 {
2271 	struct sbmac_softc *sc = netdev_priv(dev);
2272 	int err;
2273 
2274 	if (debug > 1)
2275 		pr_debug("%s: sbmac_open() irq %d.\n", dev->name, dev->irq);
2276 
2277 	/*
2278 	 * map/route interrupt (clear status first, in case something
2279 	 * weird is pending; we haven't initialized the mac registers
2280 	 * yet)
2281 	 */
2282 
2283 	__raw_readq(sc->sbm_isr);
2284 	err = request_irq(dev->irq, sbmac_intr, IRQF_SHARED, dev->name, dev);
2285 	if (err) {
2286 		printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name,
2287 		       dev->irq);
2288 		goto out_err;
2289 	}
2290 
2291 	sc->sbm_speed = sbmac_speed_none;
2292 	sc->sbm_duplex = sbmac_duplex_none;
2293 	sc->sbm_fc = sbmac_fc_none;
2294 	sc->sbm_pause = -1;
2295 	sc->sbm_link = 0;
2296 
2297 	/*
2298 	 * Attach to the PHY
2299 	 */
2300 	err = sbmac_mii_probe(dev);
2301 	if (err)
2302 		goto out_unregister;
2303 
2304 	/*
2305 	 * Turn on the channel
2306 	 */
2307 
2308 	sbmac_set_channel_state(sc,sbmac_state_on);
2309 
2310 	netif_start_queue(dev);
2311 
2312 	sbmac_set_rx_mode(dev);
2313 
2314 	phy_start(sc->phy_dev);
2315 
2316 	napi_enable(&sc->napi);
2317 
2318 	return 0;
2319 
2320 out_unregister:
2321 	free_irq(dev->irq, dev);
2322 out_err:
2323 	return err;
2324 }
2325 
sbmac_mii_probe(struct net_device * dev)2326 static int sbmac_mii_probe(struct net_device *dev)
2327 {
2328 	struct sbmac_softc *sc = netdev_priv(dev);
2329 	struct phy_device *phy_dev;
2330 
2331 	phy_dev = phy_find_first(sc->mii_bus);
2332 	if (!phy_dev) {
2333 		printk(KERN_ERR "%s: no PHY found\n", dev->name);
2334 		return -ENXIO;
2335 	}
2336 
2337 	phy_dev = phy_connect(dev, dev_name(&phy_dev->mdio.dev),
2338 			      &sbmac_mii_poll, PHY_INTERFACE_MODE_GMII);
2339 	if (IS_ERR(phy_dev)) {
2340 		printk(KERN_ERR "%s: could not attach to PHY\n", dev->name);
2341 		return PTR_ERR(phy_dev);
2342 	}
2343 
2344 	/* Remove any features not supported by the controller */
2345 	phy_set_max_speed(phy_dev, SPEED_1000);
2346 	phy_support_asym_pause(phy_dev);
2347 
2348 	phy_attached_info(phy_dev);
2349 
2350 	sc->phy_dev = phy_dev;
2351 
2352 	return 0;
2353 }
2354 
2355 
sbmac_mii_poll(struct net_device * dev)2356 static void sbmac_mii_poll(struct net_device *dev)
2357 {
2358 	struct sbmac_softc *sc = netdev_priv(dev);
2359 	struct phy_device *phy_dev = sc->phy_dev;
2360 	unsigned long flags;
2361 	enum sbmac_fc fc;
2362 	int link_chg, speed_chg, duplex_chg, pause_chg, fc_chg;
2363 
2364 	link_chg = (sc->sbm_link != phy_dev->link);
2365 	speed_chg = (sc->sbm_speed != phy_dev->speed);
2366 	duplex_chg = (sc->sbm_duplex != phy_dev->duplex);
2367 	pause_chg = (sc->sbm_pause != phy_dev->pause);
2368 
2369 	if (!link_chg && !speed_chg && !duplex_chg && !pause_chg)
2370 		return;					/* Hmmm... */
2371 
2372 	if (!phy_dev->link) {
2373 		if (link_chg) {
2374 			sc->sbm_link = phy_dev->link;
2375 			sc->sbm_speed = sbmac_speed_none;
2376 			sc->sbm_duplex = sbmac_duplex_none;
2377 			sc->sbm_fc = sbmac_fc_disabled;
2378 			sc->sbm_pause = -1;
2379 			pr_info("%s: link unavailable\n", dev->name);
2380 		}
2381 		return;
2382 	}
2383 
2384 	if (phy_dev->duplex == DUPLEX_FULL) {
2385 		if (phy_dev->pause)
2386 			fc = sbmac_fc_frame;
2387 		else
2388 			fc = sbmac_fc_disabled;
2389 	} else
2390 		fc = sbmac_fc_collision;
2391 	fc_chg = (sc->sbm_fc != fc);
2392 
2393 	pr_info("%s: link available: %dbase-%cD\n", dev->name, phy_dev->speed,
2394 		phy_dev->duplex == DUPLEX_FULL ? 'F' : 'H');
2395 
2396 	spin_lock_irqsave(&sc->sbm_lock, flags);
2397 
2398 	sc->sbm_speed = phy_dev->speed;
2399 	sc->sbm_duplex = phy_dev->duplex;
2400 	sc->sbm_fc = fc;
2401 	sc->sbm_pause = phy_dev->pause;
2402 	sc->sbm_link = phy_dev->link;
2403 
2404 	if ((speed_chg || duplex_chg || fc_chg) &&
2405 	    sc->sbm_state != sbmac_state_off) {
2406 		/*
2407 		 * something changed, restart the channel
2408 		 */
2409 		if (debug > 1)
2410 			pr_debug("%s: restarting channel "
2411 				 "because PHY state changed\n", dev->name);
2412 		sbmac_channel_stop(sc);
2413 		sbmac_channel_start(sc);
2414 	}
2415 
2416 	spin_unlock_irqrestore(&sc->sbm_lock, flags);
2417 }
2418 
2419 
sbmac_tx_timeout(struct net_device * dev,unsigned int txqueue)2420 static void sbmac_tx_timeout (struct net_device *dev, unsigned int txqueue)
2421 {
2422 	struct sbmac_softc *sc = netdev_priv(dev);
2423 	unsigned long flags;
2424 
2425 	spin_lock_irqsave(&sc->sbm_lock, flags);
2426 
2427 
2428 	netif_trans_update(dev); /* prevent tx timeout */
2429 	dev->stats.tx_errors++;
2430 
2431 	spin_unlock_irqrestore(&sc->sbm_lock, flags);
2432 
2433 	printk (KERN_WARNING "%s: Transmit timed out\n",dev->name);
2434 }
2435 
2436 
2437 
2438 
sbmac_set_rx_mode(struct net_device * dev)2439 static void sbmac_set_rx_mode(struct net_device *dev)
2440 {
2441 	unsigned long flags;
2442 	struct sbmac_softc *sc = netdev_priv(dev);
2443 
2444 	spin_lock_irqsave(&sc->sbm_lock, flags);
2445 	if ((dev->flags ^ sc->sbm_devflags) & IFF_PROMISC) {
2446 		/*
2447 		 * Promiscuous changed.
2448 		 */
2449 
2450 		if (dev->flags & IFF_PROMISC) {
2451 			sbmac_promiscuous_mode(sc,1);
2452 		}
2453 		else {
2454 			sbmac_promiscuous_mode(sc,0);
2455 		}
2456 	}
2457 	spin_unlock_irqrestore(&sc->sbm_lock, flags);
2458 
2459 	/*
2460 	 * Program the multicasts.  Do this every time.
2461 	 */
2462 
2463 	sbmac_setmulti(sc);
2464 
2465 }
2466 
sbmac_mii_ioctl(struct net_device * dev,struct ifreq * rq,int cmd)2467 static int sbmac_mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
2468 {
2469 	struct sbmac_softc *sc = netdev_priv(dev);
2470 
2471 	if (!netif_running(dev) || !sc->phy_dev)
2472 		return -EINVAL;
2473 
2474 	return phy_mii_ioctl(sc->phy_dev, rq, cmd);
2475 }
2476 
sbmac_close(struct net_device * dev)2477 static int sbmac_close(struct net_device *dev)
2478 {
2479 	struct sbmac_softc *sc = netdev_priv(dev);
2480 
2481 	napi_disable(&sc->napi);
2482 
2483 	phy_stop(sc->phy_dev);
2484 
2485 	sbmac_set_channel_state(sc, sbmac_state_off);
2486 
2487 	netif_stop_queue(dev);
2488 
2489 	if (debug > 1)
2490 		pr_debug("%s: Shutting down ethercard\n", dev->name);
2491 
2492 	phy_disconnect(sc->phy_dev);
2493 	sc->phy_dev = NULL;
2494 	free_irq(dev->irq, dev);
2495 
2496 	sbdma_emptyring(&(sc->sbm_txdma));
2497 	sbdma_emptyring(&(sc->sbm_rxdma));
2498 
2499 	return 0;
2500 }
2501 
sbmac_poll(struct napi_struct * napi,int budget)2502 static int sbmac_poll(struct napi_struct *napi, int budget)
2503 {
2504 	struct sbmac_softc *sc = container_of(napi, struct sbmac_softc, napi);
2505 	int work_done;
2506 
2507 	work_done = sbdma_rx_process(sc, &(sc->sbm_rxdma), budget, 1);
2508 	sbdma_tx_process(sc, &(sc->sbm_txdma), 1);
2509 
2510 	if (work_done < budget) {
2511 		napi_complete_done(napi, work_done);
2512 
2513 #ifdef CONFIG_SBMAC_COALESCE
2514 		__raw_writeq(((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_TX_CH0) |
2515 			     ((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_RX_CH0),
2516 			     sc->sbm_imr);
2517 #else
2518 		__raw_writeq((M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
2519 			     (M_MAC_INT_CHANNEL << S_MAC_RX_CH0), sc->sbm_imr);
2520 #endif
2521 	}
2522 
2523 	return work_done;
2524 }
2525 
2526 
sbmac_probe(struct platform_device * pldev)2527 static int sbmac_probe(struct platform_device *pldev)
2528 {
2529 	struct net_device *dev;
2530 	struct sbmac_softc *sc;
2531 	void __iomem *sbm_base;
2532 	struct resource *res;
2533 	u64 sbmac_orig_hwaddr;
2534 	int err;
2535 
2536 	res = platform_get_resource(pldev, IORESOURCE_MEM, 0);
2537 	if (!res) {
2538 		printk(KERN_ERR "%s: failed to get resource\n",
2539 		       dev_name(&pldev->dev));
2540 		err = -EINVAL;
2541 		goto out_out;
2542 	}
2543 	sbm_base = ioremap(res->start, resource_size(res));
2544 	if (!sbm_base) {
2545 		printk(KERN_ERR "%s: unable to map device registers\n",
2546 		       dev_name(&pldev->dev));
2547 		err = -ENOMEM;
2548 		goto out_out;
2549 	}
2550 
2551 	/*
2552 	 * The R_MAC_ETHERNET_ADDR register will be set to some nonzero
2553 	 * value for us by the firmware if we're going to use this MAC.
2554 	 * If we find a zero, skip this MAC.
2555 	 */
2556 	sbmac_orig_hwaddr = __raw_readq(sbm_base + R_MAC_ETHERNET_ADDR);
2557 	pr_debug("%s: %sconfiguring MAC at 0x%08Lx\n", dev_name(&pldev->dev),
2558 		 sbmac_orig_hwaddr ? "" : "not ", (long long)res->start);
2559 	if (sbmac_orig_hwaddr == 0) {
2560 		err = 0;
2561 		goto out_unmap;
2562 	}
2563 
2564 	/*
2565 	 * Okay, cool.  Initialize this MAC.
2566 	 */
2567 	dev = alloc_etherdev(sizeof(struct sbmac_softc));
2568 	if (!dev) {
2569 		err = -ENOMEM;
2570 		goto out_unmap;
2571 	}
2572 
2573 	platform_set_drvdata(pldev, dev);
2574 	SET_NETDEV_DEV(dev, &pldev->dev);
2575 
2576 	sc = netdev_priv(dev);
2577 	sc->sbm_base = sbm_base;
2578 
2579 	err = sbmac_init(pldev, res->start);
2580 	if (err)
2581 		goto out_kfree;
2582 
2583 	return 0;
2584 
2585 out_kfree:
2586 	free_netdev(dev);
2587 	__raw_writeq(sbmac_orig_hwaddr, sbm_base + R_MAC_ETHERNET_ADDR);
2588 
2589 out_unmap:
2590 	iounmap(sbm_base);
2591 
2592 out_out:
2593 	return err;
2594 }
2595 
sbmac_remove(struct platform_device * pldev)2596 static int sbmac_remove(struct platform_device *pldev)
2597 {
2598 	struct net_device *dev = platform_get_drvdata(pldev);
2599 	struct sbmac_softc *sc = netdev_priv(dev);
2600 
2601 	unregister_netdev(dev);
2602 	sbmac_uninitctx(sc);
2603 	mdiobus_unregister(sc->mii_bus);
2604 	mdiobus_free(sc->mii_bus);
2605 	iounmap(sc->sbm_base);
2606 	free_netdev(dev);
2607 
2608 	return 0;
2609 }
2610 
2611 static struct platform_driver sbmac_driver = {
2612 	.probe = sbmac_probe,
2613 	.remove = sbmac_remove,
2614 	.driver = {
2615 		.name = sbmac_string,
2616 	},
2617 };
2618 
2619 module_platform_driver(sbmac_driver);
2620 MODULE_LICENSE("GPL");
2621