1 /*
2  * DaVinci Ethernet Medium Access Controller
3  *
4  * DaVinci EMAC is based upon CPPI 3.0 TI DMA engine
5  *
6  * Copyright (C) 2009 Texas Instruments.
7  *
8  * ---------------------------------------------------------------------------
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23  * ---------------------------------------------------------------------------
24  * History:
25  * 0-5 A number of folks worked on this driver in bits and pieces but the major
26  *     contribution came from Suraj Iyer and Anant Gole
27  * 6.0 Anant Gole - rewrote the driver as per Linux conventions
28  * 6.1 Chaithrika U S - added support for Gigabit and RMII features,
29  *     PHY layer usage
30  */
31 
32 #include <linux/module.h>
33 #include <linux/kernel.h>
34 #include <linux/sched.h>
35 #include <linux/string.h>
36 #include <linux/timer.h>
37 #include <linux/errno.h>
38 #include <linux/in.h>
39 #include <linux/ioport.h>
40 #include <linux/slab.h>
41 #include <linux/mm.h>
42 #include <linux/interrupt.h>
43 #include <linux/init.h>
44 #include <linux/netdevice.h>
45 #include <linux/etherdevice.h>
46 #include <linux/skbuff.h>
47 #include <linux/ethtool.h>
48 #include <linux/highmem.h>
49 #include <linux/proc_fs.h>
50 #include <linux/ctype.h>
51 #include <linux/spinlock.h>
52 #include <linux/dma-mapping.h>
53 #include <linux/clk.h>
54 #include <linux/platform_device.h>
55 #include <linux/regmap.h>
56 #include <linux/semaphore.h>
57 #include <linux/phy.h>
58 #include <linux/bitops.h>
59 #include <linux/io.h>
60 #include <linux/uaccess.h>
61 #include <linux/pm_runtime.h>
62 #include <linux/davinci_emac.h>
63 #include <linux/of.h>
64 #include <linux/of_address.h>
65 #include <linux/of_device.h>
66 #include <linux/of_mdio.h>
67 #include <linux/of_irq.h>
68 #include <linux/of_net.h>
69 #include <linux/mfd/syscon.h>
70 
71 #include <asm/irq.h>
72 #include <asm/page.h>
73 
74 #include "cpsw.h"
75 #include "davinci_cpdma.h"
76 
77 static int debug_level;
78 module_param(debug_level, int, 0);
79 MODULE_PARM_DESC(debug_level, "DaVinci EMAC debug level (NETIF_MSG bits)");
80 
81 /* Netif debug messages possible */
82 #define DAVINCI_EMAC_DEBUG	(NETIF_MSG_DRV | \
83 				NETIF_MSG_PROBE | \
84 				NETIF_MSG_LINK | \
85 				NETIF_MSG_TIMER | \
86 				NETIF_MSG_IFDOWN | \
87 				NETIF_MSG_IFUP | \
88 				NETIF_MSG_RX_ERR | \
89 				NETIF_MSG_TX_ERR | \
90 				NETIF_MSG_TX_QUEUED | \
91 				NETIF_MSG_INTR | \
92 				NETIF_MSG_TX_DONE | \
93 				NETIF_MSG_RX_STATUS | \
94 				NETIF_MSG_PKTDATA | \
95 				NETIF_MSG_HW | \
96 				NETIF_MSG_WOL)
97 
98 /* version info */
99 #define EMAC_MAJOR_VERSION	6
100 #define EMAC_MINOR_VERSION	1
101 #define EMAC_MODULE_VERSION	"6.1"
102 MODULE_VERSION(EMAC_MODULE_VERSION);
103 static const char emac_version_string[] = "TI DaVinci EMAC Linux v6.1";
104 
105 /* Configuration items */
106 #define EMAC_DEF_PASS_CRC		(0) /* Do not pass CRC up to frames */
107 #define EMAC_DEF_QOS_EN			(0) /* EMAC proprietary QoS disabled */
108 #define EMAC_DEF_NO_BUFF_CHAIN		(0) /* No buffer chain */
109 #define EMAC_DEF_MACCTRL_FRAME_EN	(0) /* Discard Maccontrol frames */
110 #define EMAC_DEF_SHORT_FRAME_EN		(0) /* Discard short frames */
111 #define EMAC_DEF_ERROR_FRAME_EN		(0) /* Discard error frames */
112 #define EMAC_DEF_PROM_EN		(0) /* Promiscuous disabled */
113 #define EMAC_DEF_PROM_CH		(0) /* Promiscuous channel is 0 */
114 #define EMAC_DEF_BCAST_EN		(1) /* Broadcast enabled */
115 #define EMAC_DEF_BCAST_CH		(0) /* Broadcast channel is 0 */
116 #define EMAC_DEF_MCAST_EN		(1) /* Multicast enabled */
117 #define EMAC_DEF_MCAST_CH		(0) /* Multicast channel is 0 */
118 
119 #define EMAC_DEF_TXPRIO_FIXED		(1) /* TX Priority is fixed */
120 #define EMAC_DEF_TXPACING_EN		(0) /* TX pacing NOT supported*/
121 
122 #define EMAC_DEF_BUFFER_OFFSET		(0) /* Buffer offset to DMA (future) */
123 #define EMAC_DEF_MIN_ETHPKTSIZE		(60) /* Minimum ethernet pkt size */
124 #define EMAC_DEF_MAX_FRAME_SIZE		(1500 + 14 + 4 + 4)
125 #define EMAC_DEF_TX_CH			(0) /* Default 0th channel */
126 #define EMAC_DEF_RX_CH			(0) /* Default 0th channel */
127 #define EMAC_DEF_RX_NUM_DESC		(128)
128 #define EMAC_DEF_MAX_TX_CH		(1) /* Max TX channels configured */
129 #define EMAC_DEF_MAX_RX_CH		(1) /* Max RX channels configured */
130 #define EMAC_POLL_WEIGHT		(64) /* Default NAPI poll weight */
131 
132 /* Buffer descriptor parameters */
133 #define EMAC_DEF_TX_MAX_SERVICE		(32) /* TX max service BD's */
134 #define EMAC_DEF_RX_MAX_SERVICE		(64) /* should = netdev->weight */
135 
136 /* EMAC register related defines */
137 #define EMAC_ALL_MULTI_REG_VALUE	(0xFFFFFFFF)
138 #define EMAC_NUM_MULTICAST_BITS		(64)
139 #define EMAC_TX_CONTROL_TX_ENABLE_VAL	(0x1)
140 #define EMAC_RX_CONTROL_RX_ENABLE_VAL	(0x1)
141 #define EMAC_MAC_HOST_ERR_INTMASK_VAL	(0x2)
142 #define EMAC_RX_UNICAST_CLEAR_ALL	(0xFF)
143 #define EMAC_INT_MASK_CLEAR		(0xFF)
144 
145 /* RX MBP register bit positions */
146 #define EMAC_RXMBP_PASSCRC_MASK		BIT(30)
147 #define EMAC_RXMBP_QOSEN_MASK		BIT(29)
148 #define EMAC_RXMBP_NOCHAIN_MASK		BIT(28)
149 #define EMAC_RXMBP_CMFEN_MASK		BIT(24)
150 #define EMAC_RXMBP_CSFEN_MASK		BIT(23)
151 #define EMAC_RXMBP_CEFEN_MASK		BIT(22)
152 #define EMAC_RXMBP_CAFEN_MASK		BIT(21)
153 #define EMAC_RXMBP_PROMCH_SHIFT		(16)
154 #define EMAC_RXMBP_PROMCH_MASK		(0x7 << 16)
155 #define EMAC_RXMBP_BROADEN_MASK		BIT(13)
156 #define EMAC_RXMBP_BROADCH_SHIFT	(8)
157 #define EMAC_RXMBP_BROADCH_MASK		(0x7 << 8)
158 #define EMAC_RXMBP_MULTIEN_MASK		BIT(5)
159 #define EMAC_RXMBP_MULTICH_SHIFT	(0)
160 #define EMAC_RXMBP_MULTICH_MASK		(0x7)
161 #define EMAC_RXMBP_CHMASK		(0x7)
162 
163 /* EMAC register definitions/bit maps used */
164 # define EMAC_MBP_RXPROMISC		(0x00200000)
165 # define EMAC_MBP_PROMISCCH(ch)		(((ch) & 0x7) << 16)
166 # define EMAC_MBP_RXBCAST		(0x00002000)
167 # define EMAC_MBP_BCASTCHAN(ch)		(((ch) & 0x7) << 8)
168 # define EMAC_MBP_RXMCAST		(0x00000020)
169 # define EMAC_MBP_MCASTCHAN(ch)		((ch) & 0x7)
170 
171 /* EMAC mac_control register */
172 #define EMAC_MACCONTROL_TXPTYPE		BIT(9)
173 #define EMAC_MACCONTROL_TXPACEEN	BIT(6)
174 #define EMAC_MACCONTROL_GMIIEN		BIT(5)
175 #define EMAC_MACCONTROL_GIGABITEN	BIT(7)
176 #define EMAC_MACCONTROL_FULLDUPLEXEN	BIT(0)
177 #define EMAC_MACCONTROL_RMIISPEED_MASK	BIT(15)
178 
179 /* GIGABIT MODE related bits */
180 #define EMAC_DM646X_MACCONTORL_GIG	BIT(7)
181 #define EMAC_DM646X_MACCONTORL_GIGFORCE	BIT(17)
182 
183 /* EMAC mac_status register */
184 #define EMAC_MACSTATUS_TXERRCODE_MASK	(0xF00000)
185 #define EMAC_MACSTATUS_TXERRCODE_SHIFT	(20)
186 #define EMAC_MACSTATUS_TXERRCH_MASK	(0x7)
187 #define EMAC_MACSTATUS_TXERRCH_SHIFT	(16)
188 #define EMAC_MACSTATUS_RXERRCODE_MASK	(0xF000)
189 #define EMAC_MACSTATUS_RXERRCODE_SHIFT	(12)
190 #define EMAC_MACSTATUS_RXERRCH_MASK	(0x7)
191 #define EMAC_MACSTATUS_RXERRCH_SHIFT	(8)
192 
193 /* EMAC RX register masks */
194 #define EMAC_RX_MAX_LEN_MASK		(0xFFFF)
195 #define EMAC_RX_BUFFER_OFFSET_MASK	(0xFFFF)
196 
197 /* MAC_IN_VECTOR (0x180) register bit fields */
198 #define EMAC_DM644X_MAC_IN_VECTOR_HOST_INT	BIT(17)
199 #define EMAC_DM644X_MAC_IN_VECTOR_STATPEND_INT	BIT(16)
200 #define EMAC_DM644X_MAC_IN_VECTOR_RX_INT_VEC	BIT(8)
201 #define EMAC_DM644X_MAC_IN_VECTOR_TX_INT_VEC	BIT(0)
202 
203 /** NOTE:: For DM646x the IN_VECTOR has changed */
204 #define EMAC_DM646X_MAC_IN_VECTOR_RX_INT_VEC	BIT(EMAC_DEF_RX_CH)
205 #define EMAC_DM646X_MAC_IN_VECTOR_TX_INT_VEC	BIT(16 + EMAC_DEF_TX_CH)
206 #define EMAC_DM646X_MAC_IN_VECTOR_HOST_INT	BIT(26)
207 #define EMAC_DM646X_MAC_IN_VECTOR_STATPEND_INT	BIT(27)
208 
209 /* CPPI bit positions */
210 #define EMAC_CPPI_SOP_BIT		BIT(31)
211 #define EMAC_CPPI_EOP_BIT		BIT(30)
212 #define EMAC_CPPI_OWNERSHIP_BIT		BIT(29)
213 #define EMAC_CPPI_EOQ_BIT		BIT(28)
214 #define EMAC_CPPI_TEARDOWN_COMPLETE_BIT BIT(27)
215 #define EMAC_CPPI_PASS_CRC_BIT		BIT(26)
216 #define EMAC_RX_BD_BUF_SIZE		(0xFFFF)
217 #define EMAC_BD_LENGTH_FOR_CACHE	(16) /* only CPPI bytes */
218 #define EMAC_RX_BD_PKT_LENGTH_MASK	(0xFFFF)
219 
220 /* Max hardware defines */
221 #define EMAC_MAX_TXRX_CHANNELS		 (8)  /* Max hardware channels */
222 #define EMAC_DEF_MAX_MULTICAST_ADDRESSES (64) /* Max mcast addr's */
223 
224 /* EMAC Peripheral Device Register Memory Layout structure */
225 #define EMAC_MACINVECTOR	0x90
226 
227 #define EMAC_DM646X_MACEOIVECTOR	0x94
228 
229 #define EMAC_MACINTSTATRAW	0xB0
230 #define EMAC_MACINTSTATMASKED	0xB4
231 #define EMAC_MACINTMASKSET	0xB8
232 #define EMAC_MACINTMASKCLEAR	0xBC
233 
234 #define EMAC_RXMBPENABLE	0x100
235 #define EMAC_RXUNICASTSET	0x104
236 #define EMAC_RXUNICASTCLEAR	0x108
237 #define EMAC_RXMAXLEN		0x10C
238 #define EMAC_RXBUFFEROFFSET	0x110
239 #define EMAC_RXFILTERLOWTHRESH	0x114
240 
241 #define EMAC_MACCONTROL		0x160
242 #define EMAC_MACSTATUS		0x164
243 #define EMAC_EMCONTROL		0x168
244 #define EMAC_FIFOCONTROL	0x16C
245 #define EMAC_MACCONFIG		0x170
246 #define EMAC_SOFTRESET		0x174
247 #define EMAC_MACSRCADDRLO	0x1D0
248 #define EMAC_MACSRCADDRHI	0x1D4
249 #define EMAC_MACHASH1		0x1D8
250 #define EMAC_MACHASH2		0x1DC
251 #define EMAC_MACADDRLO		0x500
252 #define EMAC_MACADDRHI		0x504
253 #define EMAC_MACINDEX		0x508
254 
255 /* EMAC statistics registers */
256 #define EMAC_RXGOODFRAMES	0x200
257 #define EMAC_RXBCASTFRAMES	0x204
258 #define EMAC_RXMCASTFRAMES	0x208
259 #define EMAC_RXPAUSEFRAMES	0x20C
260 #define EMAC_RXCRCERRORS	0x210
261 #define EMAC_RXALIGNCODEERRORS	0x214
262 #define EMAC_RXOVERSIZED	0x218
263 #define EMAC_RXJABBER		0x21C
264 #define EMAC_RXUNDERSIZED	0x220
265 #define EMAC_RXFRAGMENTS	0x224
266 #define EMAC_RXFILTERED		0x228
267 #define EMAC_RXQOSFILTERED	0x22C
268 #define EMAC_RXOCTETS		0x230
269 #define EMAC_TXGOODFRAMES	0x234
270 #define EMAC_TXBCASTFRAMES	0x238
271 #define EMAC_TXMCASTFRAMES	0x23C
272 #define EMAC_TXPAUSEFRAMES	0x240
273 #define EMAC_TXDEFERRED		0x244
274 #define EMAC_TXCOLLISION	0x248
275 #define EMAC_TXSINGLECOLL	0x24C
276 #define EMAC_TXMULTICOLL	0x250
277 #define EMAC_TXEXCESSIVECOLL	0x254
278 #define EMAC_TXLATECOLL		0x258
279 #define EMAC_TXUNDERRUN		0x25C
280 #define EMAC_TXCARRIERSENSE	0x260
281 #define EMAC_TXOCTETS		0x264
282 #define EMAC_NETOCTETS		0x280
283 #define EMAC_RXSOFOVERRUNS	0x284
284 #define EMAC_RXMOFOVERRUNS	0x288
285 #define EMAC_RXDMAOVERRUNS	0x28C
286 
287 /* EMAC DM644x control registers */
288 #define EMAC_CTRL_EWCTL		(0x4)
289 #define EMAC_CTRL_EWINTTCNT	(0x8)
290 
291 /* EMAC DM644x control module masks */
292 #define EMAC_DM644X_EWINTCNT_MASK	0x1FFFF
293 #define EMAC_DM644X_INTMIN_INTVL	0x1
294 #define EMAC_DM644X_INTMAX_INTVL	(EMAC_DM644X_EWINTCNT_MASK)
295 
296 /* EMAC DM646X control module registers */
297 #define EMAC_DM646X_CMINTCTRL	0x0C
298 #define EMAC_DM646X_CMRXINTEN	0x14
299 #define EMAC_DM646X_CMTXINTEN	0x18
300 #define EMAC_DM646X_CMRXINTMAX	0x70
301 #define EMAC_DM646X_CMTXINTMAX	0x74
302 
303 /* EMAC DM646X control module masks */
304 #define EMAC_DM646X_INTPACEEN		(0x3 << 16)
305 #define EMAC_DM646X_INTPRESCALE_MASK	(0x7FF << 0)
306 #define EMAC_DM646X_CMINTMAX_CNT	63
307 #define EMAC_DM646X_CMINTMIN_CNT	2
308 #define EMAC_DM646X_CMINTMAX_INTVL	(1000 / EMAC_DM646X_CMINTMIN_CNT)
309 #define EMAC_DM646X_CMINTMIN_INTVL	((1000 / EMAC_DM646X_CMINTMAX_CNT) + 1)
310 
311 
312 /* EMAC EOI codes for C0 */
313 #define EMAC_DM646X_MAC_EOI_C0_RXEN	(0x01)
314 #define EMAC_DM646X_MAC_EOI_C0_TXEN	(0x02)
315 
316 /* EMAC Stats Clear Mask */
317 #define EMAC_STATS_CLR_MASK    (0xFFFFFFFF)
318 
319 /* emac_priv: EMAC private data structure
320  *
321  * EMAC adapter private data structure
322  */
323 struct emac_priv {
324 	u32 msg_enable;
325 	struct net_device *ndev;
326 	struct platform_device *pdev;
327 	struct napi_struct napi;
328 	char mac_addr[6];
329 	void __iomem *remap_addr;
330 	u32 emac_base_phys;
331 	void __iomem *emac_base;
332 	void __iomem *ctrl_base;
333 	struct cpdma_ctlr *dma;
334 	struct cpdma_chan *txchan;
335 	struct cpdma_chan *rxchan;
336 	u32 link; /* 1=link on, 0=link off */
337 	u32 speed; /* 0=Auto Neg, 1=No PHY, 10,100, 1000 - mbps */
338 	u32 duplex; /* Link duplex: 0=Half, 1=Full */
339 	u32 rx_buf_size;
340 	u32 isr_count;
341 	u32 coal_intvl;
342 	u32 bus_freq_mhz;
343 	u8 rmii_en;
344 	u8 version;
345 	u32 mac_hash1;
346 	u32 mac_hash2;
347 	u32 multicast_hash_cnt[EMAC_NUM_MULTICAST_BITS];
348 	u32 rx_addr_type;
349 	const char *phy_id;
350 	struct device_node *phy_node;
351 	spinlock_t lock;
352 	/*platform specific members*/
353 	void (*int_enable) (void);
354 	void (*int_disable) (void);
355 };
356 
357 /* EMAC TX Host Error description strings */
358 static char *emac_txhost_errcodes[16] = {
359 	"No error", "SOP error", "Ownership bit not set in SOP buffer",
360 	"Zero Next Buffer Descriptor Pointer Without EOP",
361 	"Zero Buffer Pointer", "Zero Buffer Length", "Packet Length Error",
362 	"Reserved", "Reserved", "Reserved", "Reserved", "Reserved",
363 	"Reserved", "Reserved", "Reserved", "Reserved"
364 };
365 
366 /* EMAC RX Host Error description strings */
367 static char *emac_rxhost_errcodes[16] = {
368 	"No error", "Reserved", "Ownership bit not set in input buffer",
369 	"Reserved", "Zero Buffer Pointer", "Reserved", "Reserved",
370 	"Reserved", "Reserved", "Reserved", "Reserved", "Reserved",
371 	"Reserved", "Reserved", "Reserved", "Reserved"
372 };
373 
374 /* Helper macros */
375 #define emac_read(reg)		  ioread32(priv->emac_base + (reg))
376 #define emac_write(reg, val)      iowrite32(val, priv->emac_base + (reg))
377 
378 #define emac_ctrl_read(reg)	  ioread32((priv->ctrl_base + (reg)))
379 #define emac_ctrl_write(reg, val) iowrite32(val, (priv->ctrl_base + (reg)))
380 
381 /**
382  * emac_get_drvinfo - Get EMAC driver information
383  * @ndev: The DaVinci EMAC network adapter
384  * @info: ethtool info structure containing name and version
385  *
386  * Returns EMAC driver information (name and version)
387  *
388  */
389 static void emac_get_drvinfo(struct net_device *ndev,
390 			     struct ethtool_drvinfo *info)
391 {
392 	strlcpy(info->driver, emac_version_string, sizeof(info->driver));
393 	strlcpy(info->version, EMAC_MODULE_VERSION, sizeof(info->version));
394 }
395 
396 /**
397  * emac_get_coalesce - Get interrupt coalesce settings for this device
398  * @ndev : The DaVinci EMAC network adapter
399  * @coal : ethtool coalesce settings structure
400  *
401  * Fetch the current interrupt coalesce settings
402  *
403  */
404 static int emac_get_coalesce(struct net_device *ndev,
405 				struct ethtool_coalesce *coal)
406 {
407 	struct emac_priv *priv = netdev_priv(ndev);
408 
409 	coal->rx_coalesce_usecs = priv->coal_intvl;
410 	return 0;
411 
412 }
413 
414 /**
415  * emac_set_coalesce - Set interrupt coalesce settings for this device
416  * @ndev : The DaVinci EMAC network adapter
417  * @coal : ethtool coalesce settings structure
418  *
419  * Set interrupt coalesce parameters
420  *
421  */
422 static int emac_set_coalesce(struct net_device *ndev,
423 				struct ethtool_coalesce *coal)
424 {
425 	struct emac_priv *priv = netdev_priv(ndev);
426 	u32 int_ctrl, num_interrupts = 0;
427 	u32 prescale = 0, addnl_dvdr = 1, coal_intvl = 0;
428 
429 	if (!coal->rx_coalesce_usecs)
430 		return -EINVAL;
431 
432 	coal_intvl = coal->rx_coalesce_usecs;
433 
434 	switch (priv->version) {
435 	case EMAC_VERSION_2:
436 		int_ctrl =  emac_ctrl_read(EMAC_DM646X_CMINTCTRL);
437 		prescale = priv->bus_freq_mhz * 4;
438 
439 		if (coal_intvl < EMAC_DM646X_CMINTMIN_INTVL)
440 			coal_intvl = EMAC_DM646X_CMINTMIN_INTVL;
441 
442 		if (coal_intvl > EMAC_DM646X_CMINTMAX_INTVL) {
443 			/*
444 			 * Interrupt pacer works with 4us Pulse, we can
445 			 * throttle further by dilating the 4us pulse.
446 			 */
447 			addnl_dvdr = EMAC_DM646X_INTPRESCALE_MASK / prescale;
448 
449 			if (addnl_dvdr > 1) {
450 				prescale *= addnl_dvdr;
451 				if (coal_intvl > (EMAC_DM646X_CMINTMAX_INTVL
452 							* addnl_dvdr))
453 					coal_intvl = (EMAC_DM646X_CMINTMAX_INTVL
454 							* addnl_dvdr);
455 			} else {
456 				addnl_dvdr = 1;
457 				coal_intvl = EMAC_DM646X_CMINTMAX_INTVL;
458 			}
459 		}
460 
461 		num_interrupts = (1000 * addnl_dvdr) / coal_intvl;
462 
463 		int_ctrl |= EMAC_DM646X_INTPACEEN;
464 		int_ctrl &= (~EMAC_DM646X_INTPRESCALE_MASK);
465 		int_ctrl |= (prescale & EMAC_DM646X_INTPRESCALE_MASK);
466 		emac_ctrl_write(EMAC_DM646X_CMINTCTRL, int_ctrl);
467 
468 		emac_ctrl_write(EMAC_DM646X_CMRXINTMAX, num_interrupts);
469 		emac_ctrl_write(EMAC_DM646X_CMTXINTMAX, num_interrupts);
470 
471 		break;
472 	default:
473 		int_ctrl = emac_ctrl_read(EMAC_CTRL_EWINTTCNT);
474 		int_ctrl &= (~EMAC_DM644X_EWINTCNT_MASK);
475 		prescale = coal_intvl * priv->bus_freq_mhz;
476 		if (prescale > EMAC_DM644X_EWINTCNT_MASK) {
477 			prescale = EMAC_DM644X_EWINTCNT_MASK;
478 			coal_intvl = prescale / priv->bus_freq_mhz;
479 		}
480 		emac_ctrl_write(EMAC_CTRL_EWINTTCNT, (int_ctrl | prescale));
481 
482 		break;
483 	}
484 
485 	printk(KERN_INFO"Set coalesce to %d usecs.\n", coal_intvl);
486 	priv->coal_intvl = coal_intvl;
487 
488 	return 0;
489 
490 }
491 
492 
493 /* ethtool_ops: DaVinci EMAC Ethtool structure
494  *
495  * Ethtool support for EMAC adapter
496  */
497 static const struct ethtool_ops ethtool_ops = {
498 	.get_drvinfo = emac_get_drvinfo,
499 	.get_link = ethtool_op_get_link,
500 	.get_coalesce = emac_get_coalesce,
501 	.set_coalesce =  emac_set_coalesce,
502 	.get_ts_info = ethtool_op_get_ts_info,
503 	.get_link_ksettings = phy_ethtool_get_link_ksettings,
504 	.set_link_ksettings = phy_ethtool_set_link_ksettings,
505 };
506 
507 /**
508  * emac_update_phystatus - Update Phy status
509  * @priv: The DaVinci EMAC private adapter structure
510  *
511  * Updates phy status and takes action for network queue if required
512  * based upon link status
513  *
514  */
515 static void emac_update_phystatus(struct emac_priv *priv)
516 {
517 	u32 mac_control;
518 	u32 new_duplex;
519 	u32 cur_duplex;
520 	struct net_device *ndev = priv->ndev;
521 
522 	mac_control = emac_read(EMAC_MACCONTROL);
523 	cur_duplex = (mac_control & EMAC_MACCONTROL_FULLDUPLEXEN) ?
524 			DUPLEX_FULL : DUPLEX_HALF;
525 	if (ndev->phydev)
526 		new_duplex = ndev->phydev->duplex;
527 	else
528 		new_duplex = DUPLEX_FULL;
529 
530 	/* We get called only if link has changed (speed/duplex/status) */
531 	if ((priv->link) && (new_duplex != cur_duplex)) {
532 		priv->duplex = new_duplex;
533 		if (DUPLEX_FULL == priv->duplex)
534 			mac_control |= (EMAC_MACCONTROL_FULLDUPLEXEN);
535 		else
536 			mac_control &= ~(EMAC_MACCONTROL_FULLDUPLEXEN);
537 	}
538 
539 	if (priv->speed == SPEED_1000 && (priv->version == EMAC_VERSION_2)) {
540 		mac_control = emac_read(EMAC_MACCONTROL);
541 		mac_control |= (EMAC_DM646X_MACCONTORL_GIG |
542 				EMAC_DM646X_MACCONTORL_GIGFORCE);
543 	} else {
544 		/* Clear the GIG bit and GIGFORCE bit */
545 		mac_control &= ~(EMAC_DM646X_MACCONTORL_GIGFORCE |
546 					EMAC_DM646X_MACCONTORL_GIG);
547 
548 		if (priv->rmii_en && (priv->speed == SPEED_100))
549 			mac_control |= EMAC_MACCONTROL_RMIISPEED_MASK;
550 		else
551 			mac_control &= ~EMAC_MACCONTROL_RMIISPEED_MASK;
552 	}
553 
554 	/* Update mac_control if changed */
555 	emac_write(EMAC_MACCONTROL, mac_control);
556 
557 	if (priv->link) {
558 		/* link ON */
559 		if (!netif_carrier_ok(ndev))
560 			netif_carrier_on(ndev);
561 	/* reactivate the transmit queue if it is stopped */
562 		if (netif_running(ndev) && netif_queue_stopped(ndev))
563 			netif_wake_queue(ndev);
564 	} else {
565 		/* link OFF */
566 		if (netif_carrier_ok(ndev))
567 			netif_carrier_off(ndev);
568 		if (!netif_queue_stopped(ndev))
569 			netif_stop_queue(ndev);
570 	}
571 }
572 
573 /**
574  * hash_get - Calculate hash value from mac address
575  * @addr: mac address to delete from hash table
576  *
577  * Calculates hash value from mac address
578  *
579  */
580 static u32 hash_get(u8 *addr)
581 {
582 	u32 hash;
583 	u8 tmpval;
584 	int cnt;
585 	hash = 0;
586 
587 	for (cnt = 0; cnt < 2; cnt++) {
588 		tmpval = *addr++;
589 		hash ^= (tmpval >> 2) ^ (tmpval << 4);
590 		tmpval = *addr++;
591 		hash ^= (tmpval >> 4) ^ (tmpval << 2);
592 		tmpval = *addr++;
593 		hash ^= (tmpval >> 6) ^ (tmpval);
594 	}
595 
596 	return hash & 0x3F;
597 }
598 
599 /**
600  * emac_hash_add - Hash function to add mac addr from hash table
601  * @priv: The DaVinci EMAC private adapter structure
602  * @mac_addr: mac address to delete from hash table
603  *
604  * Adds mac address to the internal hash table
605  *
606  */
607 static int emac_hash_add(struct emac_priv *priv, u8 *mac_addr)
608 {
609 	struct device *emac_dev = &priv->ndev->dev;
610 	u32 rc = 0;
611 	u32 hash_bit;
612 	u32 hash_value = hash_get(mac_addr);
613 
614 	if (hash_value >= EMAC_NUM_MULTICAST_BITS) {
615 		if (netif_msg_drv(priv)) {
616 			dev_err(emac_dev, "DaVinci EMAC: emac_hash_add(): Invalid "\
617 				"Hash %08x, should not be greater than %08x",
618 				hash_value, (EMAC_NUM_MULTICAST_BITS - 1));
619 		}
620 		return -1;
621 	}
622 
623 	/* set the hash bit only if not previously set */
624 	if (priv->multicast_hash_cnt[hash_value] == 0) {
625 		rc = 1; /* hash value changed */
626 		if (hash_value < 32) {
627 			hash_bit = BIT(hash_value);
628 			priv->mac_hash1 |= hash_bit;
629 		} else {
630 			hash_bit = BIT((hash_value - 32));
631 			priv->mac_hash2 |= hash_bit;
632 		}
633 	}
634 
635 	/* incr counter for num of mcast addr's mapped to "this" hash bit */
636 	++priv->multicast_hash_cnt[hash_value];
637 
638 	return rc;
639 }
640 
641 /**
642  * emac_hash_del - Hash function to delete mac addr from hash table
643  * @priv: The DaVinci EMAC private adapter structure
644  * @mac_addr: mac address to delete from hash table
645  *
646  * Removes mac address from the internal hash table
647  *
648  */
649 static int emac_hash_del(struct emac_priv *priv, u8 *mac_addr)
650 {
651 	u32 hash_value;
652 	u32 hash_bit;
653 
654 	hash_value = hash_get(mac_addr);
655 	if (priv->multicast_hash_cnt[hash_value] > 0) {
656 		/* dec cntr for num of mcast addr's mapped to this hash bit */
657 		--priv->multicast_hash_cnt[hash_value];
658 	}
659 
660 	/* if counter still > 0, at least one multicast address refers
661 	 * to this hash bit. so return 0 */
662 	if (priv->multicast_hash_cnt[hash_value] > 0)
663 		return 0;
664 
665 	if (hash_value < 32) {
666 		hash_bit = BIT(hash_value);
667 		priv->mac_hash1 &= ~hash_bit;
668 	} else {
669 		hash_bit = BIT((hash_value - 32));
670 		priv->mac_hash2 &= ~hash_bit;
671 	}
672 
673 	/* return 1 to indicate change in mac_hash registers reqd */
674 	return 1;
675 }
676 
677 /* EMAC multicast operation */
678 #define EMAC_MULTICAST_ADD	0
679 #define EMAC_MULTICAST_DEL	1
680 #define EMAC_ALL_MULTI_SET	2
681 #define EMAC_ALL_MULTI_CLR	3
682 
683 /**
684  * emac_add_mcast - Set multicast address in the EMAC adapter (Internal)
685  * @priv: The DaVinci EMAC private adapter structure
686  * @action: multicast operation to perform
687  * mac_addr: mac address to set
688  *
689  * Set multicast addresses in EMAC adapter - internal function
690  *
691  */
692 static void emac_add_mcast(struct emac_priv *priv, u32 action, u8 *mac_addr)
693 {
694 	struct device *emac_dev = &priv->ndev->dev;
695 	int update = -1;
696 
697 	switch (action) {
698 	case EMAC_MULTICAST_ADD:
699 		update = emac_hash_add(priv, mac_addr);
700 		break;
701 	case EMAC_MULTICAST_DEL:
702 		update = emac_hash_del(priv, mac_addr);
703 		break;
704 	case EMAC_ALL_MULTI_SET:
705 		update = 1;
706 		priv->mac_hash1 = EMAC_ALL_MULTI_REG_VALUE;
707 		priv->mac_hash2 = EMAC_ALL_MULTI_REG_VALUE;
708 		break;
709 	case EMAC_ALL_MULTI_CLR:
710 		update = 1;
711 		priv->mac_hash1 = 0;
712 		priv->mac_hash2 = 0;
713 		memset(&(priv->multicast_hash_cnt[0]), 0,
714 		sizeof(priv->multicast_hash_cnt[0]) *
715 		       EMAC_NUM_MULTICAST_BITS);
716 		break;
717 	default:
718 		if (netif_msg_drv(priv))
719 			dev_err(emac_dev, "DaVinci EMAC: add_mcast"\
720 				": bad operation %d", action);
721 		break;
722 	}
723 
724 	/* write to the hardware only if the register status chances */
725 	if (update > 0) {
726 		emac_write(EMAC_MACHASH1, priv->mac_hash1);
727 		emac_write(EMAC_MACHASH2, priv->mac_hash2);
728 	}
729 }
730 
731 /**
732  * emac_dev_mcast_set - Set multicast address in the EMAC adapter
733  * @ndev: The DaVinci EMAC network adapter
734  *
735  * Set multicast addresses in EMAC adapter
736  *
737  */
738 static void emac_dev_mcast_set(struct net_device *ndev)
739 {
740 	u32 mbp_enable;
741 	struct emac_priv *priv = netdev_priv(ndev);
742 
743 	mbp_enable = emac_read(EMAC_RXMBPENABLE);
744 	if (ndev->flags & IFF_PROMISC) {
745 		mbp_enable &= (~EMAC_MBP_PROMISCCH(EMAC_DEF_PROM_CH));
746 		mbp_enable |= (EMAC_MBP_RXPROMISC);
747 	} else {
748 		mbp_enable = (mbp_enable & ~EMAC_MBP_RXPROMISC);
749 		if ((ndev->flags & IFF_ALLMULTI) ||
750 		    netdev_mc_count(ndev) > EMAC_DEF_MAX_MULTICAST_ADDRESSES) {
751 			mbp_enable = (mbp_enable | EMAC_MBP_RXMCAST);
752 			emac_add_mcast(priv, EMAC_ALL_MULTI_SET, NULL);
753 		} else if (!netdev_mc_empty(ndev)) {
754 			struct netdev_hw_addr *ha;
755 
756 			mbp_enable = (mbp_enable | EMAC_MBP_RXMCAST);
757 			emac_add_mcast(priv, EMAC_ALL_MULTI_CLR, NULL);
758 			/* program multicast address list into EMAC hardware */
759 			netdev_for_each_mc_addr(ha, ndev) {
760 				emac_add_mcast(priv, EMAC_MULTICAST_ADD,
761 					       (u8 *) ha->addr);
762 			}
763 		} else {
764 			mbp_enable = (mbp_enable & ~EMAC_MBP_RXMCAST);
765 			emac_add_mcast(priv, EMAC_ALL_MULTI_CLR, NULL);
766 		}
767 	}
768 	/* Set mbp config register */
769 	emac_write(EMAC_RXMBPENABLE, mbp_enable);
770 }
771 
772 /*************************************************************************
773  *  EMAC Hardware manipulation
774  *************************************************************************/
775 
776 /**
777  * emac_int_disable - Disable EMAC module interrupt (from adapter)
778  * @priv: The DaVinci EMAC private adapter structure
779  *
780  * Disable EMAC interrupt on the adapter
781  *
782  */
783 static void emac_int_disable(struct emac_priv *priv)
784 {
785 	if (priv->version == EMAC_VERSION_2) {
786 		unsigned long flags;
787 
788 		local_irq_save(flags);
789 
790 		/* Program C0_Int_En to zero to turn off
791 		* interrupts to the CPU */
792 		emac_ctrl_write(EMAC_DM646X_CMRXINTEN, 0x0);
793 		emac_ctrl_write(EMAC_DM646X_CMTXINTEN, 0x0);
794 		/* NOTE: Rx Threshold and Misc interrupts are not disabled */
795 		if (priv->int_disable)
796 			priv->int_disable();
797 
798 		/* NOTE: Rx Threshold and Misc interrupts are not enabled */
799 
800 		/* ack rxen only then a new pulse will be generated */
801 		emac_write(EMAC_DM646X_MACEOIVECTOR,
802 			EMAC_DM646X_MAC_EOI_C0_RXEN);
803 
804 		/* ack txen- only then a new pulse will be generated */
805 		emac_write(EMAC_DM646X_MACEOIVECTOR,
806 			EMAC_DM646X_MAC_EOI_C0_TXEN);
807 
808 		local_irq_restore(flags);
809 
810 	} else {
811 		/* Set DM644x control registers for interrupt control */
812 		emac_ctrl_write(EMAC_CTRL_EWCTL, 0x0);
813 	}
814 }
815 
816 /**
817  * emac_int_enable - Enable EMAC module interrupt (from adapter)
818  * @priv: The DaVinci EMAC private adapter structure
819  *
820  * Enable EMAC interrupt on the adapter
821  *
822  */
823 static void emac_int_enable(struct emac_priv *priv)
824 {
825 	if (priv->version == EMAC_VERSION_2) {
826 		if (priv->int_enable)
827 			priv->int_enable();
828 
829 		emac_ctrl_write(EMAC_DM646X_CMRXINTEN, 0xff);
830 		emac_ctrl_write(EMAC_DM646X_CMTXINTEN, 0xff);
831 
832 		/* In addition to turning on interrupt Enable, we need
833 		 * ack by writing appropriate values to the EOI
834 		 * register */
835 
836 		/* NOTE: Rx Threshold and Misc interrupts are not enabled */
837 	} else {
838 		/* Set DM644x control registers for interrupt control */
839 		emac_ctrl_write(EMAC_CTRL_EWCTL, 0x1);
840 	}
841 }
842 
843 /**
844  * emac_irq - EMAC interrupt handler
845  * @irq: interrupt number
846  * @dev_id: EMAC network adapter data structure ptr
847  *
848  * EMAC Interrupt handler - we only schedule NAPI and not process any packets
849  * here. EVen the interrupt status is checked (TX/RX/Err) in NAPI poll function
850  *
851  * Returns interrupt handled condition
852  */
853 static irqreturn_t emac_irq(int irq, void *dev_id)
854 {
855 	struct net_device *ndev = (struct net_device *)dev_id;
856 	struct emac_priv *priv = netdev_priv(ndev);
857 
858 	++priv->isr_count;
859 	if (likely(netif_running(priv->ndev))) {
860 		emac_int_disable(priv);
861 		napi_schedule(&priv->napi);
862 	} else {
863 		/* we are closing down, so dont process anything */
864 	}
865 	return IRQ_HANDLED;
866 }
867 
868 static struct sk_buff *emac_rx_alloc(struct emac_priv *priv)
869 {
870 	struct sk_buff *skb = netdev_alloc_skb(priv->ndev, priv->rx_buf_size);
871 	if (WARN_ON(!skb))
872 		return NULL;
873 	skb_reserve(skb, NET_IP_ALIGN);
874 	return skb;
875 }
876 
877 static void emac_rx_handler(void *token, int len, int status)
878 {
879 	struct sk_buff		*skb = token;
880 	struct net_device	*ndev = skb->dev;
881 	struct emac_priv	*priv = netdev_priv(ndev);
882 	struct device		*emac_dev = &ndev->dev;
883 	int			ret;
884 
885 	/* free and bail if we are shutting down */
886 	if (unlikely(!netif_running(ndev))) {
887 		dev_kfree_skb_any(skb);
888 		return;
889 	}
890 
891 	/* recycle on receive error */
892 	if (status < 0) {
893 		ndev->stats.rx_errors++;
894 		goto recycle;
895 	}
896 
897 	/* feed received packet up the stack */
898 	skb_put(skb, len);
899 	skb->protocol = eth_type_trans(skb, ndev);
900 	netif_receive_skb(skb);
901 	ndev->stats.rx_bytes += len;
902 	ndev->stats.rx_packets++;
903 
904 	/* alloc a new packet for receive */
905 	skb = emac_rx_alloc(priv);
906 	if (!skb) {
907 		if (netif_msg_rx_err(priv) && net_ratelimit())
908 			dev_err(emac_dev, "failed rx buffer alloc\n");
909 		return;
910 	}
911 
912 recycle:
913 	ret = cpdma_chan_submit(priv->rxchan, skb, skb->data,
914 			skb_tailroom(skb), 0);
915 
916 	WARN_ON(ret == -ENOMEM);
917 	if (unlikely(ret < 0))
918 		dev_kfree_skb_any(skb);
919 }
920 
921 static void emac_tx_handler(void *token, int len, int status)
922 {
923 	struct sk_buff		*skb = token;
924 	struct net_device	*ndev = skb->dev;
925 
926 	/* Check whether the queue is stopped due to stalled tx dma, if the
927 	 * queue is stopped then start the queue as we have free desc for tx
928 	 */
929 	if (unlikely(netif_queue_stopped(ndev)))
930 		netif_wake_queue(ndev);
931 	ndev->stats.tx_packets++;
932 	ndev->stats.tx_bytes += len;
933 	dev_kfree_skb_any(skb);
934 }
935 
936 /**
937  * emac_dev_xmit - EMAC Transmit function
938  * @skb: SKB pointer
939  * @ndev: The DaVinci EMAC network adapter
940  *
941  * Called by the system to transmit a packet  - we queue the packet in
942  * EMAC hardware transmit queue
943  *
944  * Returns success(NETDEV_TX_OK) or error code (typically out of desc's)
945  */
946 static int emac_dev_xmit(struct sk_buff *skb, struct net_device *ndev)
947 {
948 	struct device *emac_dev = &ndev->dev;
949 	int ret_code;
950 	struct emac_priv *priv = netdev_priv(ndev);
951 
952 	/* If no link, return */
953 	if (unlikely(!priv->link)) {
954 		if (netif_msg_tx_err(priv) && net_ratelimit())
955 			dev_err(emac_dev, "DaVinci EMAC: No link to transmit");
956 		goto fail_tx;
957 	}
958 
959 	ret_code = skb_padto(skb, EMAC_DEF_MIN_ETHPKTSIZE);
960 	if (unlikely(ret_code < 0)) {
961 		if (netif_msg_tx_err(priv) && net_ratelimit())
962 			dev_err(emac_dev, "DaVinci EMAC: packet pad failed");
963 		goto fail_tx;
964 	}
965 
966 	skb_tx_timestamp(skb);
967 
968 	ret_code = cpdma_chan_submit(priv->txchan, skb, skb->data, skb->len,
969 				     0);
970 	if (unlikely(ret_code != 0)) {
971 		if (netif_msg_tx_err(priv) && net_ratelimit())
972 			dev_err(emac_dev, "DaVinci EMAC: desc submit failed");
973 		goto fail_tx;
974 	}
975 
976 	/* If there is no more tx desc left free then we need to
977 	 * tell the kernel to stop sending us tx frames.
978 	 */
979 	if (unlikely(!cpdma_check_free_tx_desc(priv->txchan)))
980 		netif_stop_queue(ndev);
981 
982 	return NETDEV_TX_OK;
983 
984 fail_tx:
985 	ndev->stats.tx_dropped++;
986 	netif_stop_queue(ndev);
987 	return NETDEV_TX_BUSY;
988 }
989 
990 /**
991  * emac_dev_tx_timeout - EMAC Transmit timeout function
992  * @ndev: The DaVinci EMAC network adapter
993  *
994  * Called when system detects that a skb timeout period has expired
995  * potentially due to a fault in the adapter in not being able to send
996  * it out on the wire. We teardown the TX channel assuming a hardware
997  * error and re-initialize the TX channel for hardware operation
998  *
999  */
1000 static void emac_dev_tx_timeout(struct net_device *ndev)
1001 {
1002 	struct emac_priv *priv = netdev_priv(ndev);
1003 	struct device *emac_dev = &ndev->dev;
1004 
1005 	if (netif_msg_tx_err(priv))
1006 		dev_err(emac_dev, "DaVinci EMAC: xmit timeout, restarting TX");
1007 
1008 	ndev->stats.tx_errors++;
1009 	emac_int_disable(priv);
1010 	cpdma_chan_stop(priv->txchan);
1011 	cpdma_chan_start(priv->txchan);
1012 	emac_int_enable(priv);
1013 }
1014 
1015 /**
1016  * emac_set_type0addr - Set EMAC Type0 mac address
1017  * @priv: The DaVinci EMAC private adapter structure
1018  * @ch: RX channel number
1019  * @mac_addr: MAC address to set in device
1020  *
1021  * Called internally to set Type0 mac address of the adapter (Device)
1022  *
1023  * Returns success (0) or appropriate error code (none as of now)
1024  */
1025 static void emac_set_type0addr(struct emac_priv *priv, u32 ch, char *mac_addr)
1026 {
1027 	u32 val;
1028 	val = ((mac_addr[5] << 8) | (mac_addr[4]));
1029 	emac_write(EMAC_MACSRCADDRLO, val);
1030 
1031 	val = ((mac_addr[3] << 24) | (mac_addr[2] << 16) | \
1032 	       (mac_addr[1] << 8) | (mac_addr[0]));
1033 	emac_write(EMAC_MACSRCADDRHI, val);
1034 	val = emac_read(EMAC_RXUNICASTSET);
1035 	val |= BIT(ch);
1036 	emac_write(EMAC_RXUNICASTSET, val);
1037 	val = emac_read(EMAC_RXUNICASTCLEAR);
1038 	val &= ~BIT(ch);
1039 	emac_write(EMAC_RXUNICASTCLEAR, val);
1040 }
1041 
1042 /**
1043  * emac_set_type1addr - Set EMAC Type1 mac address
1044  * @priv: The DaVinci EMAC private adapter structure
1045  * @ch: RX channel number
1046  * @mac_addr: MAC address to set in device
1047  *
1048  * Called internally to set Type1 mac address of the adapter (Device)
1049  *
1050  * Returns success (0) or appropriate error code (none as of now)
1051  */
1052 static void emac_set_type1addr(struct emac_priv *priv, u32 ch, char *mac_addr)
1053 {
1054 	u32 val;
1055 	emac_write(EMAC_MACINDEX, ch);
1056 	val = ((mac_addr[5] << 8) | mac_addr[4]);
1057 	emac_write(EMAC_MACADDRLO, val);
1058 	val = ((mac_addr[3] << 24) | (mac_addr[2] << 16) | \
1059 	       (mac_addr[1] << 8) | (mac_addr[0]));
1060 	emac_write(EMAC_MACADDRHI, val);
1061 	emac_set_type0addr(priv, ch, mac_addr);
1062 }
1063 
1064 /**
1065  * emac_set_type2addr - Set EMAC Type2 mac address
1066  * @priv: The DaVinci EMAC private adapter structure
1067  * @ch: RX channel number
1068  * @mac_addr: MAC address to set in device
1069  * @index: index into RX address entries
1070  * @match: match parameter for RX address matching logic
1071  *
1072  * Called internally to set Type2 mac address of the adapter (Device)
1073  *
1074  * Returns success (0) or appropriate error code (none as of now)
1075  */
1076 static void emac_set_type2addr(struct emac_priv *priv, u32 ch,
1077 			       char *mac_addr, int index, int match)
1078 {
1079 	u32 val;
1080 	emac_write(EMAC_MACINDEX, index);
1081 	val = ((mac_addr[3] << 24) | (mac_addr[2] << 16) | \
1082 	       (mac_addr[1] << 8) | (mac_addr[0]));
1083 	emac_write(EMAC_MACADDRHI, val);
1084 	val = ((mac_addr[5] << 8) | mac_addr[4] | ((ch & 0x7) << 16) | \
1085 	       (match << 19) | BIT(20));
1086 	emac_write(EMAC_MACADDRLO, val);
1087 	emac_set_type0addr(priv, ch, mac_addr);
1088 }
1089 
1090 /**
1091  * emac_setmac - Set mac address in the adapter (internal function)
1092  * @priv: The DaVinci EMAC private adapter structure
1093  * @ch: RX channel number
1094  * @mac_addr: MAC address to set in device
1095  *
1096  * Called internally to set the mac address of the adapter (Device)
1097  *
1098  * Returns success (0) or appropriate error code (none as of now)
1099  */
1100 static void emac_setmac(struct emac_priv *priv, u32 ch, char *mac_addr)
1101 {
1102 	struct device *emac_dev = &priv->ndev->dev;
1103 
1104 	if (priv->rx_addr_type == 0) {
1105 		emac_set_type0addr(priv, ch, mac_addr);
1106 	} else if (priv->rx_addr_type == 1) {
1107 		u32 cnt;
1108 		for (cnt = 0; cnt < EMAC_MAX_TXRX_CHANNELS; cnt++)
1109 			emac_set_type1addr(priv, ch, mac_addr);
1110 	} else if (priv->rx_addr_type == 2) {
1111 		emac_set_type2addr(priv, ch, mac_addr, ch, 1);
1112 		emac_set_type0addr(priv, ch, mac_addr);
1113 	} else {
1114 		if (netif_msg_drv(priv))
1115 			dev_err(emac_dev, "DaVinci EMAC: Wrong addressing\n");
1116 	}
1117 }
1118 
1119 /**
1120  * emac_dev_setmac_addr - Set mac address in the adapter
1121  * @ndev: The DaVinci EMAC network adapter
1122  * @addr: MAC address to set in device
1123  *
1124  * Called by the system to set the mac address of the adapter (Device)
1125  *
1126  * Returns success (0) or appropriate error code (none as of now)
1127  */
1128 static int emac_dev_setmac_addr(struct net_device *ndev, void *addr)
1129 {
1130 	struct emac_priv *priv = netdev_priv(ndev);
1131 	struct device *emac_dev = &priv->ndev->dev;
1132 	struct sockaddr *sa = addr;
1133 
1134 	if (!is_valid_ether_addr(sa->sa_data))
1135 		return -EADDRNOTAVAIL;
1136 
1137 	/* Store mac addr in priv and rx channel and set it in EMAC hw */
1138 	memcpy(priv->mac_addr, sa->sa_data, ndev->addr_len);
1139 	memcpy(ndev->dev_addr, sa->sa_data, ndev->addr_len);
1140 
1141 	/* MAC address is configured only after the interface is enabled. */
1142 	if (netif_running(ndev)) {
1143 		emac_setmac(priv, EMAC_DEF_RX_CH, priv->mac_addr);
1144 	}
1145 
1146 	if (netif_msg_drv(priv))
1147 		dev_notice(emac_dev, "DaVinci EMAC: emac_dev_setmac_addr %pM\n",
1148 					priv->mac_addr);
1149 
1150 	return 0;
1151 }
1152 
1153 /**
1154  * emac_hw_enable - Enable EMAC hardware for packet transmission/reception
1155  * @priv: The DaVinci EMAC private adapter structure
1156  *
1157  * Enables EMAC hardware for packet processing - enables PHY, enables RX
1158  * for packet reception and enables device interrupts and then NAPI
1159  *
1160  * Returns success (0) or appropriate error code (none right now)
1161  */
1162 static int emac_hw_enable(struct emac_priv *priv)
1163 {
1164 	u32 val, mbp_enable, mac_control;
1165 
1166 	/* Soft reset */
1167 	emac_write(EMAC_SOFTRESET, 1);
1168 	while (emac_read(EMAC_SOFTRESET))
1169 		cpu_relax();
1170 
1171 	/* Disable interrupt & Set pacing for more interrupts initially */
1172 	emac_int_disable(priv);
1173 
1174 	/* Full duplex enable bit set when auto negotiation happens */
1175 	mac_control =
1176 		(((EMAC_DEF_TXPRIO_FIXED) ? (EMAC_MACCONTROL_TXPTYPE) : 0x0) |
1177 		((priv->speed == 1000) ? EMAC_MACCONTROL_GIGABITEN : 0x0) |
1178 		((EMAC_DEF_TXPACING_EN) ? (EMAC_MACCONTROL_TXPACEEN) : 0x0) |
1179 		((priv->duplex == DUPLEX_FULL) ? 0x1 : 0));
1180 	emac_write(EMAC_MACCONTROL, mac_control);
1181 
1182 	mbp_enable =
1183 		(((EMAC_DEF_PASS_CRC) ? (EMAC_RXMBP_PASSCRC_MASK) : 0x0) |
1184 		((EMAC_DEF_QOS_EN) ? (EMAC_RXMBP_QOSEN_MASK) : 0x0) |
1185 		 ((EMAC_DEF_NO_BUFF_CHAIN) ? (EMAC_RXMBP_NOCHAIN_MASK) : 0x0) |
1186 		 ((EMAC_DEF_MACCTRL_FRAME_EN) ? (EMAC_RXMBP_CMFEN_MASK) : 0x0) |
1187 		 ((EMAC_DEF_SHORT_FRAME_EN) ? (EMAC_RXMBP_CSFEN_MASK) : 0x0) |
1188 		 ((EMAC_DEF_ERROR_FRAME_EN) ? (EMAC_RXMBP_CEFEN_MASK) : 0x0) |
1189 		 ((EMAC_DEF_PROM_EN) ? (EMAC_RXMBP_CAFEN_MASK) : 0x0) |
1190 		 ((EMAC_DEF_PROM_CH & EMAC_RXMBP_CHMASK) << \
1191 			EMAC_RXMBP_PROMCH_SHIFT) |
1192 		 ((EMAC_DEF_BCAST_EN) ? (EMAC_RXMBP_BROADEN_MASK) : 0x0) |
1193 		 ((EMAC_DEF_BCAST_CH & EMAC_RXMBP_CHMASK) << \
1194 			EMAC_RXMBP_BROADCH_SHIFT) |
1195 		 ((EMAC_DEF_MCAST_EN) ? (EMAC_RXMBP_MULTIEN_MASK) : 0x0) |
1196 		 ((EMAC_DEF_MCAST_CH & EMAC_RXMBP_CHMASK) << \
1197 			EMAC_RXMBP_MULTICH_SHIFT));
1198 	emac_write(EMAC_RXMBPENABLE, mbp_enable);
1199 	emac_write(EMAC_RXMAXLEN, (EMAC_DEF_MAX_FRAME_SIZE &
1200 				   EMAC_RX_MAX_LEN_MASK));
1201 	emac_write(EMAC_RXBUFFEROFFSET, (EMAC_DEF_BUFFER_OFFSET &
1202 					 EMAC_RX_BUFFER_OFFSET_MASK));
1203 	emac_write(EMAC_RXFILTERLOWTHRESH, 0);
1204 	emac_write(EMAC_RXUNICASTCLEAR, EMAC_RX_UNICAST_CLEAR_ALL);
1205 	priv->rx_addr_type = (emac_read(EMAC_MACCONFIG) >> 8) & 0xFF;
1206 
1207 	emac_write(EMAC_MACINTMASKSET, EMAC_MAC_HOST_ERR_INTMASK_VAL);
1208 
1209 	emac_setmac(priv, EMAC_DEF_RX_CH, priv->mac_addr);
1210 
1211 	/* Enable MII */
1212 	val = emac_read(EMAC_MACCONTROL);
1213 	val |= (EMAC_MACCONTROL_GMIIEN);
1214 	emac_write(EMAC_MACCONTROL, val);
1215 
1216 	/* Enable NAPI and interrupts */
1217 	napi_enable(&priv->napi);
1218 	emac_int_enable(priv);
1219 	return 0;
1220 
1221 }
1222 
1223 /**
1224  * emac_poll - EMAC NAPI Poll function
1225  * @ndev: The DaVinci EMAC network adapter
1226  * @budget: Number of receive packets to process (as told by NAPI layer)
1227  *
1228  * NAPI Poll function implemented to process packets as per budget. We check
1229  * the type of interrupt on the device and accordingly call the TX or RX
1230  * packet processing functions. We follow the budget for RX processing and
1231  * also put a cap on number of TX pkts processed through config param. The
1232  * NAPI schedule function is called if more packets pending.
1233  *
1234  * Returns number of packets received (in most cases; else TX pkts - rarely)
1235  */
1236 static int emac_poll(struct napi_struct *napi, int budget)
1237 {
1238 	unsigned int mask;
1239 	struct emac_priv *priv = container_of(napi, struct emac_priv, napi);
1240 	struct net_device *ndev = priv->ndev;
1241 	struct device *emac_dev = &ndev->dev;
1242 	u32 status = 0;
1243 	u32 num_tx_pkts = 0, num_rx_pkts = 0;
1244 
1245 	/* Check interrupt vectors and call packet processing */
1246 	status = emac_read(EMAC_MACINVECTOR);
1247 
1248 	mask = EMAC_DM644X_MAC_IN_VECTOR_TX_INT_VEC;
1249 
1250 	if (priv->version == EMAC_VERSION_2)
1251 		mask = EMAC_DM646X_MAC_IN_VECTOR_TX_INT_VEC;
1252 
1253 	if (status & mask) {
1254 		num_tx_pkts = cpdma_chan_process(priv->txchan,
1255 					      EMAC_DEF_TX_MAX_SERVICE);
1256 	} /* TX processing */
1257 
1258 	mask = EMAC_DM644X_MAC_IN_VECTOR_RX_INT_VEC;
1259 
1260 	if (priv->version == EMAC_VERSION_2)
1261 		mask = EMAC_DM646X_MAC_IN_VECTOR_RX_INT_VEC;
1262 
1263 	if (status & mask) {
1264 		num_rx_pkts = cpdma_chan_process(priv->rxchan, budget);
1265 	} /* RX processing */
1266 
1267 	mask = EMAC_DM644X_MAC_IN_VECTOR_HOST_INT;
1268 	if (priv->version == EMAC_VERSION_2)
1269 		mask = EMAC_DM646X_MAC_IN_VECTOR_HOST_INT;
1270 
1271 	if (unlikely(status & mask)) {
1272 		u32 ch, cause;
1273 		dev_err(emac_dev, "DaVinci EMAC: Fatal Hardware Error\n");
1274 		netif_stop_queue(ndev);
1275 		napi_disable(&priv->napi);
1276 
1277 		status = emac_read(EMAC_MACSTATUS);
1278 		cause = ((status & EMAC_MACSTATUS_TXERRCODE_MASK) >>
1279 			 EMAC_MACSTATUS_TXERRCODE_SHIFT);
1280 		if (cause) {
1281 			ch = ((status & EMAC_MACSTATUS_TXERRCH_MASK) >>
1282 			      EMAC_MACSTATUS_TXERRCH_SHIFT);
1283 			if (net_ratelimit()) {
1284 				dev_err(emac_dev, "TX Host error %s on ch=%d\n",
1285 					&emac_txhost_errcodes[cause][0], ch);
1286 			}
1287 		}
1288 		cause = ((status & EMAC_MACSTATUS_RXERRCODE_MASK) >>
1289 			 EMAC_MACSTATUS_RXERRCODE_SHIFT);
1290 		if (cause) {
1291 			ch = ((status & EMAC_MACSTATUS_RXERRCH_MASK) >>
1292 			      EMAC_MACSTATUS_RXERRCH_SHIFT);
1293 			if (netif_msg_hw(priv) && net_ratelimit())
1294 				dev_err(emac_dev, "RX Host error %s on ch=%d\n",
1295 					&emac_rxhost_errcodes[cause][0], ch);
1296 		}
1297 	} else if (num_rx_pkts < budget) {
1298 		napi_complete_done(napi, num_rx_pkts);
1299 		emac_int_enable(priv);
1300 	}
1301 
1302 	return num_rx_pkts;
1303 }
1304 
1305 #ifdef CONFIG_NET_POLL_CONTROLLER
1306 /**
1307  * emac_poll_controller - EMAC Poll controller function
1308  * @ndev: The DaVinci EMAC network adapter
1309  *
1310  * Polled functionality used by netconsole and others in non interrupt mode
1311  *
1312  */
1313 static void emac_poll_controller(struct net_device *ndev)
1314 {
1315 	struct emac_priv *priv = netdev_priv(ndev);
1316 
1317 	emac_int_disable(priv);
1318 	emac_irq(ndev->irq, ndev);
1319 	emac_int_enable(priv);
1320 }
1321 #endif
1322 
1323 static void emac_adjust_link(struct net_device *ndev)
1324 {
1325 	struct emac_priv *priv = netdev_priv(ndev);
1326 	struct phy_device *phydev = ndev->phydev;
1327 	unsigned long flags;
1328 	int new_state = 0;
1329 
1330 	spin_lock_irqsave(&priv->lock, flags);
1331 
1332 	if (phydev->link) {
1333 		/* check the mode of operation - full/half duplex */
1334 		if (phydev->duplex != priv->duplex) {
1335 			new_state = 1;
1336 			priv->duplex = phydev->duplex;
1337 		}
1338 		if (phydev->speed != priv->speed) {
1339 			new_state = 1;
1340 			priv->speed = phydev->speed;
1341 		}
1342 		if (!priv->link) {
1343 			new_state = 1;
1344 			priv->link = 1;
1345 		}
1346 
1347 	} else if (priv->link) {
1348 		new_state = 1;
1349 		priv->link = 0;
1350 		priv->speed = 0;
1351 		priv->duplex = ~0;
1352 	}
1353 	if (new_state) {
1354 		emac_update_phystatus(priv);
1355 		phy_print_status(ndev->phydev);
1356 	}
1357 
1358 	spin_unlock_irqrestore(&priv->lock, flags);
1359 }
1360 
1361 /*************************************************************************
1362  *  Linux Driver Model
1363  *************************************************************************/
1364 
1365 /**
1366  * emac_devioctl - EMAC adapter ioctl
1367  * @ndev: The DaVinci EMAC network adapter
1368  * @ifrq: request parameter
1369  * @cmd: command parameter
1370  *
1371  * EMAC driver ioctl function
1372  *
1373  * Returns success(0) or appropriate error code
1374  */
1375 static int emac_devioctl(struct net_device *ndev, struct ifreq *ifrq, int cmd)
1376 {
1377 	if (!(netif_running(ndev)))
1378 		return -EINVAL;
1379 
1380 	/* TODO: Add phy read and write and private statistics get feature */
1381 
1382 	if (ndev->phydev)
1383 		return phy_mii_ioctl(ndev->phydev, ifrq, cmd);
1384 	else
1385 		return -EOPNOTSUPP;
1386 }
1387 
1388 static int match_first_device(struct device *dev, void *data)
1389 {
1390 	return !strncmp(dev_name(dev), "davinci_mdio", 12);
1391 }
1392 
1393 /**
1394  * emac_dev_open - EMAC device open
1395  * @ndev: The DaVinci EMAC network adapter
1396  *
1397  * Called when system wants to start the interface. We init TX/RX channels
1398  * and enable the hardware for packet reception/transmission and start the
1399  * network queue.
1400  *
1401  * Returns 0 for a successful open, or appropriate error code
1402  */
1403 static int emac_dev_open(struct net_device *ndev)
1404 {
1405 	struct device *emac_dev = &ndev->dev;
1406 	u32 cnt;
1407 	struct resource *res;
1408 	int q, m, ret;
1409 	int res_num = 0, irq_num = 0;
1410 	int i = 0;
1411 	struct emac_priv *priv = netdev_priv(ndev);
1412 	struct phy_device *phydev = NULL;
1413 	struct device *phy = NULL;
1414 
1415 	ret = pm_runtime_get_sync(&priv->pdev->dev);
1416 	if (ret < 0) {
1417 		pm_runtime_put_noidle(&priv->pdev->dev);
1418 		dev_err(&priv->pdev->dev, "%s: failed to get_sync(%d)\n",
1419 			__func__, ret);
1420 		return ret;
1421 	}
1422 
1423 	netif_carrier_off(ndev);
1424 	for (cnt = 0; cnt < ETH_ALEN; cnt++)
1425 		ndev->dev_addr[cnt] = priv->mac_addr[cnt];
1426 
1427 	/* Configuration items */
1428 	priv->rx_buf_size = EMAC_DEF_MAX_FRAME_SIZE + NET_IP_ALIGN;
1429 
1430 	priv->mac_hash1 = 0;
1431 	priv->mac_hash2 = 0;
1432 	emac_write(EMAC_MACHASH1, 0);
1433 	emac_write(EMAC_MACHASH2, 0);
1434 
1435 	for (i = 0; i < EMAC_DEF_RX_NUM_DESC; i++) {
1436 		struct sk_buff *skb = emac_rx_alloc(priv);
1437 
1438 		if (!skb)
1439 			break;
1440 
1441 		ret = cpdma_chan_submit(priv->rxchan, skb, skb->data,
1442 					skb_tailroom(skb), 0);
1443 		if (WARN_ON(ret < 0))
1444 			break;
1445 	}
1446 
1447 	/* Request IRQ */
1448 	while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ,
1449 					    res_num))) {
1450 		for (irq_num = res->start; irq_num <= res->end; irq_num++) {
1451 			if (request_irq(irq_num, emac_irq, 0, ndev->name,
1452 					ndev)) {
1453 				dev_err(emac_dev,
1454 					"DaVinci EMAC: request_irq() failed\n");
1455 				ret = -EBUSY;
1456 
1457 				goto rollback;
1458 			}
1459 		}
1460 		res_num++;
1461 	}
1462 	/* prepare counters for rollback in case of an error */
1463 	res_num--;
1464 	irq_num--;
1465 
1466 	/* Start/Enable EMAC hardware */
1467 	emac_hw_enable(priv);
1468 
1469 	/* Enable Interrupt pacing if configured */
1470 	if (priv->coal_intvl != 0) {
1471 		struct ethtool_coalesce coal;
1472 
1473 		coal.rx_coalesce_usecs = (priv->coal_intvl << 4);
1474 		emac_set_coalesce(ndev, &coal);
1475 	}
1476 
1477 	cpdma_ctlr_start(priv->dma);
1478 
1479 	if (priv->phy_node) {
1480 		phydev = of_phy_connect(ndev, priv->phy_node,
1481 					&emac_adjust_link, 0, 0);
1482 		if (!phydev) {
1483 			dev_err(emac_dev, "could not connect to phy %s\n",
1484 				priv->phy_node->full_name);
1485 			ret = -ENODEV;
1486 			goto err;
1487 		}
1488 	}
1489 
1490 	/* use the first phy on the bus if pdata did not give us a phy id */
1491 	if (!phydev && !priv->phy_id) {
1492 		phy = bus_find_device(&mdio_bus_type, NULL, NULL,
1493 				      match_first_device);
1494 		if (phy) {
1495 			priv->phy_id = dev_name(phy);
1496 			if (!priv->phy_id || !*priv->phy_id)
1497 				put_device(phy);
1498 		}
1499 	}
1500 
1501 	if (!phydev && priv->phy_id && *priv->phy_id) {
1502 		phydev = phy_connect(ndev, priv->phy_id,
1503 				     &emac_adjust_link,
1504 				     PHY_INTERFACE_MODE_MII);
1505 		put_device(phy);	/* reference taken by bus_find_device */
1506 		if (IS_ERR(phydev)) {
1507 			dev_err(emac_dev, "could not connect to phy %s\n",
1508 				priv->phy_id);
1509 			ret = PTR_ERR(phydev);
1510 			goto err;
1511 		}
1512 
1513 		priv->link = 0;
1514 		priv->speed = 0;
1515 		priv->duplex = ~0;
1516 
1517 		phy_attached_info(phydev);
1518 	}
1519 
1520 	if (!phydev) {
1521 		/* No PHY , fix the link, speed and duplex settings */
1522 		dev_notice(emac_dev, "no phy, defaulting to 100/full\n");
1523 		priv->link = 1;
1524 		priv->speed = SPEED_100;
1525 		priv->duplex = DUPLEX_FULL;
1526 		emac_update_phystatus(priv);
1527 	}
1528 
1529 	if (netif_msg_drv(priv))
1530 		dev_notice(emac_dev, "DaVinci EMAC: Opened %s\n", ndev->name);
1531 
1532 	if (phydev)
1533 		phy_start(phydev);
1534 
1535 	return 0;
1536 
1537 err:
1538 	emac_int_disable(priv);
1539 	napi_disable(&priv->napi);
1540 
1541 rollback:
1542 	for (q = res_num; q >= 0; q--) {
1543 		res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, q);
1544 		/* at the first iteration, irq_num is already set to the
1545 		 * right value
1546 		 */
1547 		if (q != res_num)
1548 			irq_num = res->end;
1549 
1550 		for (m = irq_num; m >= res->start; m--)
1551 			free_irq(m, ndev);
1552 	}
1553 	cpdma_ctlr_stop(priv->dma);
1554 	pm_runtime_put(&priv->pdev->dev);
1555 	return ret;
1556 }
1557 
1558 /**
1559  * emac_dev_stop - EMAC device stop
1560  * @ndev: The DaVinci EMAC network adapter
1561  *
1562  * Called when system wants to stop or down the interface. We stop the network
1563  * queue, disable interrupts and cleanup TX/RX channels.
1564  *
1565  * We return the statistics in net_device_stats structure pulled from emac
1566  */
1567 static int emac_dev_stop(struct net_device *ndev)
1568 {
1569 	struct resource *res;
1570 	int i = 0;
1571 	int irq_num;
1572 	struct emac_priv *priv = netdev_priv(ndev);
1573 	struct device *emac_dev = &ndev->dev;
1574 
1575 	/* inform the upper layers. */
1576 	netif_stop_queue(ndev);
1577 	napi_disable(&priv->napi);
1578 
1579 	netif_carrier_off(ndev);
1580 	emac_int_disable(priv);
1581 	cpdma_ctlr_stop(priv->dma);
1582 	emac_write(EMAC_SOFTRESET, 1);
1583 
1584 	if (ndev->phydev)
1585 		phy_disconnect(ndev->phydev);
1586 
1587 	/* Free IRQ */
1588 	while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, i))) {
1589 		for (irq_num = res->start; irq_num <= res->end; irq_num++)
1590 			free_irq(irq_num, priv->ndev);
1591 		i++;
1592 	}
1593 
1594 	if (netif_msg_drv(priv))
1595 		dev_notice(emac_dev, "DaVinci EMAC: %s stopped\n", ndev->name);
1596 
1597 	pm_runtime_put(&priv->pdev->dev);
1598 	return 0;
1599 }
1600 
1601 /**
1602  * emac_dev_getnetstats - EMAC get statistics function
1603  * @ndev: The DaVinci EMAC network adapter
1604  *
1605  * Called when system wants to get statistics from the device.
1606  *
1607  * We return the statistics in net_device_stats structure pulled from emac
1608  */
1609 static struct net_device_stats *emac_dev_getnetstats(struct net_device *ndev)
1610 {
1611 	struct emac_priv *priv = netdev_priv(ndev);
1612 	u32 mac_control;
1613 	u32 stats_clear_mask;
1614 	int err;
1615 
1616 	err = pm_runtime_get_sync(&priv->pdev->dev);
1617 	if (err < 0) {
1618 		pm_runtime_put_noidle(&priv->pdev->dev);
1619 		dev_err(&priv->pdev->dev, "%s: failed to get_sync(%d)\n",
1620 			__func__, err);
1621 		return &ndev->stats;
1622 	}
1623 
1624 	/* update emac hardware stats and reset the registers*/
1625 
1626 	mac_control = emac_read(EMAC_MACCONTROL);
1627 
1628 	if (mac_control & EMAC_MACCONTROL_GMIIEN)
1629 		stats_clear_mask = EMAC_STATS_CLR_MASK;
1630 	else
1631 		stats_clear_mask = 0;
1632 
1633 	ndev->stats.multicast += emac_read(EMAC_RXMCASTFRAMES);
1634 	emac_write(EMAC_RXMCASTFRAMES, stats_clear_mask);
1635 
1636 	ndev->stats.collisions += (emac_read(EMAC_TXCOLLISION) +
1637 					   emac_read(EMAC_TXSINGLECOLL) +
1638 					   emac_read(EMAC_TXMULTICOLL));
1639 	emac_write(EMAC_TXCOLLISION, stats_clear_mask);
1640 	emac_write(EMAC_TXSINGLECOLL, stats_clear_mask);
1641 	emac_write(EMAC_TXMULTICOLL, stats_clear_mask);
1642 
1643 	ndev->stats.rx_length_errors += (emac_read(EMAC_RXOVERSIZED) +
1644 						emac_read(EMAC_RXJABBER) +
1645 						emac_read(EMAC_RXUNDERSIZED));
1646 	emac_write(EMAC_RXOVERSIZED, stats_clear_mask);
1647 	emac_write(EMAC_RXJABBER, stats_clear_mask);
1648 	emac_write(EMAC_RXUNDERSIZED, stats_clear_mask);
1649 
1650 	ndev->stats.rx_over_errors += (emac_read(EMAC_RXSOFOVERRUNS) +
1651 					       emac_read(EMAC_RXMOFOVERRUNS));
1652 	emac_write(EMAC_RXSOFOVERRUNS, stats_clear_mask);
1653 	emac_write(EMAC_RXMOFOVERRUNS, stats_clear_mask);
1654 
1655 	ndev->stats.rx_fifo_errors += emac_read(EMAC_RXDMAOVERRUNS);
1656 	emac_write(EMAC_RXDMAOVERRUNS, stats_clear_mask);
1657 
1658 	ndev->stats.tx_carrier_errors +=
1659 		emac_read(EMAC_TXCARRIERSENSE);
1660 	emac_write(EMAC_TXCARRIERSENSE, stats_clear_mask);
1661 
1662 	ndev->stats.tx_fifo_errors += emac_read(EMAC_TXUNDERRUN);
1663 	emac_write(EMAC_TXUNDERRUN, stats_clear_mask);
1664 
1665 	pm_runtime_put(&priv->pdev->dev);
1666 
1667 	return &ndev->stats;
1668 }
1669 
1670 static const struct net_device_ops emac_netdev_ops = {
1671 	.ndo_open		= emac_dev_open,
1672 	.ndo_stop		= emac_dev_stop,
1673 	.ndo_start_xmit		= emac_dev_xmit,
1674 	.ndo_set_rx_mode	= emac_dev_mcast_set,
1675 	.ndo_set_mac_address	= emac_dev_setmac_addr,
1676 	.ndo_do_ioctl		= emac_devioctl,
1677 	.ndo_tx_timeout		= emac_dev_tx_timeout,
1678 	.ndo_get_stats		= emac_dev_getnetstats,
1679 #ifdef CONFIG_NET_POLL_CONTROLLER
1680 	.ndo_poll_controller	= emac_poll_controller,
1681 #endif
1682 };
1683 
1684 static const struct of_device_id davinci_emac_of_match[];
1685 
1686 static struct emac_platform_data *
1687 davinci_emac_of_get_pdata(struct platform_device *pdev, struct emac_priv *priv)
1688 {
1689 	struct device_node *np;
1690 	const struct of_device_id *match;
1691 	const struct emac_platform_data *auxdata;
1692 	struct emac_platform_data *pdata = NULL;
1693 	const u8 *mac_addr;
1694 
1695 	if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
1696 		return dev_get_platdata(&pdev->dev);
1697 
1698 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
1699 	if (!pdata)
1700 		return NULL;
1701 
1702 	np = pdev->dev.of_node;
1703 	pdata->version = EMAC_VERSION_2;
1704 
1705 	if (!is_valid_ether_addr(pdata->mac_addr)) {
1706 		mac_addr = of_get_mac_address(np);
1707 		if (mac_addr)
1708 			ether_addr_copy(pdata->mac_addr, mac_addr);
1709 	}
1710 
1711 	of_property_read_u32(np, "ti,davinci-ctrl-reg-offset",
1712 			     &pdata->ctrl_reg_offset);
1713 
1714 	of_property_read_u32(np, "ti,davinci-ctrl-mod-reg-offset",
1715 			     &pdata->ctrl_mod_reg_offset);
1716 
1717 	of_property_read_u32(np, "ti,davinci-ctrl-ram-offset",
1718 			     &pdata->ctrl_ram_offset);
1719 
1720 	of_property_read_u32(np, "ti,davinci-ctrl-ram-size",
1721 			     &pdata->ctrl_ram_size);
1722 
1723 	of_property_read_u8(np, "ti,davinci-rmii-en", &pdata->rmii_en);
1724 
1725 	pdata->no_bd_ram = of_property_read_bool(np, "ti,davinci-no-bd-ram");
1726 
1727 	priv->phy_node = of_parse_phandle(np, "phy-handle", 0);
1728 	if (!priv->phy_node) {
1729 		if (!of_phy_is_fixed_link(np))
1730 			pdata->phy_id = NULL;
1731 		else if (of_phy_register_fixed_link(np) >= 0)
1732 			priv->phy_node = of_node_get(np);
1733 	}
1734 
1735 	auxdata = pdev->dev.platform_data;
1736 	if (auxdata) {
1737 		pdata->interrupt_enable = auxdata->interrupt_enable;
1738 		pdata->interrupt_disable = auxdata->interrupt_disable;
1739 	}
1740 
1741 	match = of_match_device(davinci_emac_of_match, &pdev->dev);
1742 	if (match && match->data) {
1743 		auxdata = match->data;
1744 		pdata->version = auxdata->version;
1745 		pdata->hw_ram_addr = auxdata->hw_ram_addr;
1746 	}
1747 
1748 	return  pdata;
1749 }
1750 
1751 static int davinci_emac_try_get_mac(struct platform_device *pdev,
1752 				    int instance, u8 *mac_addr)
1753 {
1754 	if (!pdev->dev.of_node)
1755 		return -EINVAL;
1756 
1757 	return ti_cm_get_macid(&pdev->dev, instance, mac_addr);
1758 }
1759 
1760 /**
1761  * davinci_emac_probe - EMAC device probe
1762  * @pdev: The DaVinci EMAC device that we are removing
1763  *
1764  * Called when probing for emac devicesr. We get details of instances and
1765  * resource information from platform init and register a network device
1766  * and allocate resources necessary for driver to perform
1767  */
1768 static int davinci_emac_probe(struct platform_device *pdev)
1769 {
1770 	struct device_node *np = pdev->dev.of_node;
1771 	int rc = 0;
1772 	struct resource *res, *res_ctrl;
1773 	struct net_device *ndev;
1774 	struct emac_priv *priv;
1775 	unsigned long hw_ram_addr;
1776 	struct emac_platform_data *pdata;
1777 	struct cpdma_params dma_params;
1778 	struct clk *emac_clk;
1779 	unsigned long emac_bus_frequency;
1780 
1781 
1782 	/* obtain emac clock from kernel */
1783 	emac_clk = devm_clk_get(&pdev->dev, NULL);
1784 	if (IS_ERR(emac_clk)) {
1785 		dev_err(&pdev->dev, "failed to get EMAC clock\n");
1786 		return -EBUSY;
1787 	}
1788 	emac_bus_frequency = clk_get_rate(emac_clk);
1789 	devm_clk_put(&pdev->dev, emac_clk);
1790 
1791 	/* TODO: Probe PHY here if possible */
1792 
1793 	ndev = alloc_etherdev(sizeof(struct emac_priv));
1794 	if (!ndev)
1795 		return -ENOMEM;
1796 
1797 	platform_set_drvdata(pdev, ndev);
1798 	priv = netdev_priv(ndev);
1799 	priv->pdev = pdev;
1800 	priv->ndev = ndev;
1801 	priv->msg_enable = netif_msg_init(debug_level, DAVINCI_EMAC_DEBUG);
1802 
1803 	spin_lock_init(&priv->lock);
1804 
1805 	pdata = davinci_emac_of_get_pdata(pdev, priv);
1806 	if (!pdata) {
1807 		dev_err(&pdev->dev, "no platform data\n");
1808 		rc = -ENODEV;
1809 		goto err_free_netdev;
1810 	}
1811 
1812 	/* MAC addr and PHY mask , RMII enable info from platform_data */
1813 	memcpy(priv->mac_addr, pdata->mac_addr, ETH_ALEN);
1814 	priv->phy_id = pdata->phy_id;
1815 	priv->rmii_en = pdata->rmii_en;
1816 	priv->version = pdata->version;
1817 	priv->int_enable = pdata->interrupt_enable;
1818 	priv->int_disable = pdata->interrupt_disable;
1819 
1820 	priv->coal_intvl = 0;
1821 	priv->bus_freq_mhz = (u32)(emac_bus_frequency / 1000000);
1822 
1823 	/* Get EMAC platform data */
1824 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1825 	priv->emac_base_phys = res->start + pdata->ctrl_reg_offset;
1826 	priv->remap_addr = devm_ioremap_resource(&pdev->dev, res);
1827 	if (IS_ERR(priv->remap_addr)) {
1828 		rc = PTR_ERR(priv->remap_addr);
1829 		goto no_pdata;
1830 	}
1831 
1832 	res_ctrl = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1833 	if (res_ctrl) {
1834 		priv->ctrl_base =
1835 			devm_ioremap_resource(&pdev->dev, res_ctrl);
1836 		if (IS_ERR(priv->ctrl_base)) {
1837 			rc = PTR_ERR(priv->ctrl_base);
1838 			goto no_pdata;
1839 		}
1840 	} else {
1841 		priv->ctrl_base = priv->remap_addr + pdata->ctrl_mod_reg_offset;
1842 	}
1843 
1844 	priv->emac_base = priv->remap_addr + pdata->ctrl_reg_offset;
1845 	ndev->base_addr = (unsigned long)priv->remap_addr;
1846 
1847 	hw_ram_addr = pdata->hw_ram_addr;
1848 	if (!hw_ram_addr)
1849 		hw_ram_addr = (u32 __force)res->start + pdata->ctrl_ram_offset;
1850 
1851 	memset(&dma_params, 0, sizeof(dma_params));
1852 	dma_params.dev			= &pdev->dev;
1853 	dma_params.dmaregs		= priv->emac_base;
1854 	dma_params.rxthresh		= priv->emac_base + 0x120;
1855 	dma_params.rxfree		= priv->emac_base + 0x140;
1856 	dma_params.txhdp		= priv->emac_base + 0x600;
1857 	dma_params.rxhdp		= priv->emac_base + 0x620;
1858 	dma_params.txcp			= priv->emac_base + 0x640;
1859 	dma_params.rxcp			= priv->emac_base + 0x660;
1860 	dma_params.num_chan		= EMAC_MAX_TXRX_CHANNELS;
1861 	dma_params.min_packet_size	= EMAC_DEF_MIN_ETHPKTSIZE;
1862 	dma_params.desc_hw_addr		= hw_ram_addr;
1863 	dma_params.desc_mem_size	= pdata->ctrl_ram_size;
1864 	dma_params.desc_align		= 16;
1865 
1866 	dma_params.desc_mem_phys = pdata->no_bd_ram ? 0 :
1867 			(u32 __force)res->start + pdata->ctrl_ram_offset;
1868 
1869 	priv->dma = cpdma_ctlr_create(&dma_params);
1870 	if (!priv->dma) {
1871 		dev_err(&pdev->dev, "error initializing DMA\n");
1872 		rc = -ENOMEM;
1873 		goto no_pdata;
1874 	}
1875 
1876 	priv->txchan = cpdma_chan_create(priv->dma, EMAC_DEF_TX_CH,
1877 					 emac_tx_handler, 0);
1878 	priv->rxchan = cpdma_chan_create(priv->dma, EMAC_DEF_RX_CH,
1879 					 emac_rx_handler, 1);
1880 	if (WARN_ON(!priv->txchan || !priv->rxchan)) {
1881 		rc = -ENOMEM;
1882 		goto no_cpdma_chan;
1883 	}
1884 
1885 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1886 	if (!res) {
1887 		dev_err(&pdev->dev, "error getting irq res\n");
1888 		rc = -ENOENT;
1889 		goto no_cpdma_chan;
1890 	}
1891 	ndev->irq = res->start;
1892 
1893 	rc = davinci_emac_try_get_mac(pdev, res_ctrl ? 0 : 1, priv->mac_addr);
1894 	if (!rc)
1895 		ether_addr_copy(ndev->dev_addr, priv->mac_addr);
1896 
1897 	if (!is_valid_ether_addr(priv->mac_addr)) {
1898 		/* Use random MAC if none passed */
1899 		eth_hw_addr_random(ndev);
1900 		memcpy(priv->mac_addr, ndev->dev_addr, ndev->addr_len);
1901 		dev_warn(&pdev->dev, "using random MAC addr: %pM\n",
1902 							priv->mac_addr);
1903 	}
1904 
1905 	ndev->netdev_ops = &emac_netdev_ops;
1906 	ndev->ethtool_ops = &ethtool_ops;
1907 	netif_napi_add(ndev, &priv->napi, emac_poll, EMAC_POLL_WEIGHT);
1908 
1909 	pm_runtime_enable(&pdev->dev);
1910 	rc = pm_runtime_get_sync(&pdev->dev);
1911 	if (rc < 0) {
1912 		pm_runtime_put_noidle(&pdev->dev);
1913 		dev_err(&pdev->dev, "%s: failed to get_sync(%d)\n",
1914 			__func__, rc);
1915 		goto no_cpdma_chan;
1916 	}
1917 
1918 	/* register the network device */
1919 	SET_NETDEV_DEV(ndev, &pdev->dev);
1920 	rc = register_netdev(ndev);
1921 	if (rc) {
1922 		dev_err(&pdev->dev, "error in register_netdev\n");
1923 		rc = -ENODEV;
1924 		pm_runtime_put(&pdev->dev);
1925 		goto no_cpdma_chan;
1926 	}
1927 
1928 
1929 	if (netif_msg_probe(priv)) {
1930 		dev_notice(&pdev->dev, "DaVinci EMAC Probe found device "
1931 			   "(regs: %p, irq: %d)\n",
1932 			   (void *)priv->emac_base_phys, ndev->irq);
1933 	}
1934 	pm_runtime_put(&pdev->dev);
1935 
1936 	return 0;
1937 
1938 no_cpdma_chan:
1939 	if (priv->txchan)
1940 		cpdma_chan_destroy(priv->txchan);
1941 	if (priv->rxchan)
1942 		cpdma_chan_destroy(priv->rxchan);
1943 	cpdma_ctlr_destroy(priv->dma);
1944 no_pdata:
1945 	if (of_phy_is_fixed_link(np))
1946 		of_phy_deregister_fixed_link(np);
1947 	of_node_put(priv->phy_node);
1948 err_free_netdev:
1949 	free_netdev(ndev);
1950 	return rc;
1951 }
1952 
1953 /**
1954  * davinci_emac_remove - EMAC device remove
1955  * @pdev: The DaVinci EMAC device that we are removing
1956  *
1957  * Called when removing the device driver. We disable clock usage and release
1958  * the resources taken up by the driver and unregister network device
1959  */
1960 static int davinci_emac_remove(struct platform_device *pdev)
1961 {
1962 	struct net_device *ndev = platform_get_drvdata(pdev);
1963 	struct emac_priv *priv = netdev_priv(ndev);
1964 	struct device_node *np = pdev->dev.of_node;
1965 
1966 	dev_notice(&ndev->dev, "DaVinci EMAC: davinci_emac_remove()\n");
1967 
1968 	if (priv->txchan)
1969 		cpdma_chan_destroy(priv->txchan);
1970 	if (priv->rxchan)
1971 		cpdma_chan_destroy(priv->rxchan);
1972 	cpdma_ctlr_destroy(priv->dma);
1973 
1974 	unregister_netdev(ndev);
1975 	of_node_put(priv->phy_node);
1976 	pm_runtime_disable(&pdev->dev);
1977 	if (of_phy_is_fixed_link(np))
1978 		of_phy_deregister_fixed_link(np);
1979 	free_netdev(ndev);
1980 
1981 	return 0;
1982 }
1983 
1984 static int davinci_emac_suspend(struct device *dev)
1985 {
1986 	struct platform_device *pdev = to_platform_device(dev);
1987 	struct net_device *ndev = platform_get_drvdata(pdev);
1988 
1989 	if (netif_running(ndev))
1990 		emac_dev_stop(ndev);
1991 
1992 	return 0;
1993 }
1994 
1995 static int davinci_emac_resume(struct device *dev)
1996 {
1997 	struct platform_device *pdev = to_platform_device(dev);
1998 	struct net_device *ndev = platform_get_drvdata(pdev);
1999 
2000 	if (netif_running(ndev))
2001 		emac_dev_open(ndev);
2002 
2003 	return 0;
2004 }
2005 
2006 static const struct dev_pm_ops davinci_emac_pm_ops = {
2007 	.suspend	= davinci_emac_suspend,
2008 	.resume		= davinci_emac_resume,
2009 };
2010 
2011 #if IS_ENABLED(CONFIG_OF)
2012 static const struct emac_platform_data am3517_emac_data = {
2013 	.version		= EMAC_VERSION_2,
2014 	.hw_ram_addr		= 0x01e20000,
2015 };
2016 
2017 static const struct emac_platform_data dm816_emac_data = {
2018 	.version		= EMAC_VERSION_2,
2019 };
2020 
2021 static const struct of_device_id davinci_emac_of_match[] = {
2022 	{.compatible = "ti,davinci-dm6467-emac", },
2023 	{.compatible = "ti,am3517-emac", .data = &am3517_emac_data, },
2024 	{.compatible = "ti,dm816-emac", .data = &dm816_emac_data, },
2025 	{},
2026 };
2027 MODULE_DEVICE_TABLE(of, davinci_emac_of_match);
2028 #endif
2029 
2030 /* davinci_emac_driver: EMAC platform driver structure */
2031 static struct platform_driver davinci_emac_driver = {
2032 	.driver = {
2033 		.name	 = "davinci_emac",
2034 		.pm	 = &davinci_emac_pm_ops,
2035 		.of_match_table = of_match_ptr(davinci_emac_of_match),
2036 	},
2037 	.probe = davinci_emac_probe,
2038 	.remove = davinci_emac_remove,
2039 };
2040 
2041 /**
2042  * davinci_emac_init - EMAC driver module init
2043  *
2044  * Called when initializing the driver. We register the driver with
2045  * the platform.
2046  */
2047 static int __init davinci_emac_init(void)
2048 {
2049 	return platform_driver_register(&davinci_emac_driver);
2050 }
2051 late_initcall(davinci_emac_init);
2052 
2053 /**
2054  * davinci_emac_exit - EMAC driver module exit
2055  *
2056  * Called when exiting the driver completely. We unregister the driver with
2057  * the platform and exit
2058  */
2059 static void __exit davinci_emac_exit(void)
2060 {
2061 	platform_driver_unregister(&davinci_emac_driver);
2062 }
2063 module_exit(davinci_emac_exit);
2064 
2065 MODULE_LICENSE("GPL");
2066 MODULE_AUTHOR("DaVinci EMAC Maintainer: Anant Gole <anantgole@ti.com>");
2067 MODULE_AUTHOR("DaVinci EMAC Maintainer: Chaithrika U S <chaithrika@ti.com>");
2068 MODULE_DESCRIPTION("DaVinci EMAC Ethernet driver");
2069