xref: /linux/drivers/net/ethernet/freescale/fs_enet/mac-fec.c (revision 6e7fd890f1d6ac83805409e9c346240de2705584) 
1 /*
2  * Freescale Ethernet controllers
3  *
4  * Copyright (c) 2005 Intracom S.A.
5  *  by Pantelis Antoniou <panto@intracom.gr>
6  *
7  * 2005 (c) MontaVista Software, Inc.
8  * Vitaly Bordug <vbordug@ru.mvista.com>
9  *
10  * This file is licensed under the terms of the GNU General Public License
11  * version 2. This program is licensed "as is" without any warranty of any
12  * kind, whether express or implied.
13  */
14 
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/string.h>
19 #include <linux/ptrace.h>
20 #include <linux/errno.h>
21 #include <linux/crc32.h>
22 #include <linux/ioport.h>
23 #include <linux/interrupt.h>
24 #include <linux/delay.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/skbuff.h>
28 #include <linux/spinlock.h>
29 #include <linux/mii.h>
30 #include <linux/ethtool.h>
31 #include <linux/bitops.h>
32 #include <linux/fs.h>
33 #include <linux/platform_device.h>
34 #include <linux/of_address.h>
35 #include <linux/of_irq.h>
36 #include <linux/gfp.h>
37 
38 #include <asm/irq.h>
39 #include <linux/uaccess.h>
40 
41 #include "fs_enet.h"
42 #include "fec.h"
43 
44 /*************************************************/
45 
46 #if defined(CONFIG_CPM1)
47 /* for a CPM1 __raw_xxx's are sufficient */
48 #define __fs_out32(addr, x)	__raw_writel(x, addr)
49 #define __fs_out16(addr, x)	__raw_writew(x, addr)
50 #define __fs_in32(addr)	__raw_readl(addr)
51 #define __fs_in16(addr)	__raw_readw(addr)
52 #else
53 /* for others play it safe */
54 #define __fs_out32(addr, x)	out_be32(addr, x)
55 #define __fs_out16(addr, x)	out_be16(addr, x)
56 #define __fs_in32(addr)	in_be32(addr)
57 #define __fs_in16(addr)	in_be16(addr)
58 #endif
59 
60 /* write */
61 #define FW(_fecp, _reg, _v) __fs_out32(&(_fecp)->fec_ ## _reg, (_v))
62 
63 /* read */
64 #define FR(_fecp, _reg)	__fs_in32(&(_fecp)->fec_ ## _reg)
65 
66 /* set bits */
67 #define FS(_fecp, _reg, _v) FW(_fecp, _reg, FR(_fecp, _reg) | (_v))
68 
69 /* clear bits */
70 #define FC(_fecp, _reg, _v) FW(_fecp, _reg, FR(_fecp, _reg) & ~(_v))
71 
72 /*
73  * Delay to wait for FEC reset command to complete (in us)
74  */
75 #define FEC_RESET_DELAY		50
76 
77 static int whack_reset(struct fec __iomem *fecp)
78 {
79 	int i;
80 
81 	FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET);
82 	for (i = 0; i < FEC_RESET_DELAY; i++) {
83 		if ((FR(fecp, ecntrl) & FEC_ECNTRL_RESET) == 0)
84 			return 0;	/* OK */
85 		udelay(1);
86 	}
87 
88 	return -1;
89 }
90 
91 static int do_pd_setup(struct fs_enet_private *fep)
92 {
93 	struct platform_device *ofdev = to_platform_device(fep->dev);
94 
95 	fep->interrupt = irq_of_parse_and_map(ofdev->dev.of_node, 0);
96 	if (!fep->interrupt)
97 		return -EINVAL;
98 
99 	fep->fec.fecp = of_iomap(ofdev->dev.of_node, 0);
100 	if (!fep->fec.fecp)
101 		return -EINVAL;
102 
103 	return 0;
104 }
105 
106 #define FEC_NAPI_EVENT_MSK	(FEC_ENET_RXF | FEC_ENET_RXB | FEC_ENET_TXF)
107 #define FEC_EVENT		(FEC_ENET_RXF | FEC_ENET_TXF)
108 #define FEC_ERR_EVENT_MSK	(FEC_ENET_HBERR | FEC_ENET_BABR | \
109 				 FEC_ENET_BABT | FEC_ENET_EBERR)
110 
111 static int setup_data(struct net_device *dev)
112 {
113 	struct fs_enet_private *fep = netdev_priv(dev);
114 
115 	if (do_pd_setup(fep) != 0)
116 		return -EINVAL;
117 
118 	fep->fec.hthi = 0;
119 	fep->fec.htlo = 0;
120 
121 	fep->ev_napi = FEC_NAPI_EVENT_MSK;
122 	fep->ev = FEC_EVENT;
123 	fep->ev_err = FEC_ERR_EVENT_MSK;
124 
125 	return 0;
126 }
127 
128 static int allocate_bd(struct net_device *dev)
129 {
130 	struct fs_enet_private *fep = netdev_priv(dev);
131 	const struct fs_platform_info *fpi = fep->fpi;
132 
133 	fep->ring_base = (void __force __iomem *)dma_alloc_coherent(fep->dev,
134 					    (fpi->tx_ring + fpi->rx_ring) *
135 					    sizeof(cbd_t), &fep->ring_mem_addr,
136 					    GFP_KERNEL);
137 	if (fep->ring_base == NULL)
138 		return -ENOMEM;
139 
140 	return 0;
141 }
142 
143 static void free_bd(struct net_device *dev)
144 {
145 	struct fs_enet_private *fep = netdev_priv(dev);
146 	const struct fs_platform_info *fpi = fep->fpi;
147 
148 	if(fep->ring_base)
149 		dma_free_coherent(fep->dev, (fpi->tx_ring + fpi->rx_ring)
150 					* sizeof(cbd_t),
151 					(void __force *)fep->ring_base,
152 					fep->ring_mem_addr);
153 }
154 
155 static void cleanup_data(struct net_device *dev)
156 {
157 	/* nothing */
158 }
159 
160 static void set_promiscuous_mode(struct net_device *dev)
161 {
162 	struct fs_enet_private *fep = netdev_priv(dev);
163 	struct fec __iomem *fecp = fep->fec.fecp;
164 
165 	FS(fecp, r_cntrl, FEC_RCNTRL_PROM);
166 }
167 
168 static void set_multicast_start(struct net_device *dev)
169 {
170 	struct fs_enet_private *fep = netdev_priv(dev);
171 
172 	fep->fec.hthi = 0;
173 	fep->fec.htlo = 0;
174 }
175 
176 static void set_multicast_one(struct net_device *dev, const u8 *mac)
177 {
178 	struct fs_enet_private *fep = netdev_priv(dev);
179 	int temp, hash_index;
180 	u32 crc, csrVal;
181 
182 	crc = ether_crc(6, mac);
183 
184 	temp = (crc & 0x3f) >> 1;
185 	hash_index = ((temp & 0x01) << 4) |
186 		     ((temp & 0x02) << 2) |
187 		     ((temp & 0x04)) |
188 		     ((temp & 0x08) >> 2) |
189 		     ((temp & 0x10) >> 4);
190 	csrVal = 1 << hash_index;
191 	if (crc & 1)
192 		fep->fec.hthi |= csrVal;
193 	else
194 		fep->fec.htlo |= csrVal;
195 }
196 
197 static void set_multicast_finish(struct net_device *dev)
198 {
199 	struct fs_enet_private *fep = netdev_priv(dev);
200 	struct fec __iomem *fecp = fep->fec.fecp;
201 
202 	/* if all multi or too many multicasts; just enable all */
203 	if ((dev->flags & IFF_ALLMULTI) != 0 ||
204 	    netdev_mc_count(dev) > FEC_MAX_MULTICAST_ADDRS) {
205 		fep->fec.hthi = 0xffffffffU;
206 		fep->fec.htlo = 0xffffffffU;
207 	}
208 
209 	FC(fecp, r_cntrl, FEC_RCNTRL_PROM);
210 	FW(fecp, grp_hash_table_high, fep->fec.hthi);
211 	FW(fecp, grp_hash_table_low, fep->fec.htlo);
212 }
213 
214 static void set_multicast_list(struct net_device *dev)
215 {
216 	struct netdev_hw_addr *ha;
217 
218 	if ((dev->flags & IFF_PROMISC) == 0) {
219 		set_multicast_start(dev);
220 		netdev_for_each_mc_addr(ha, dev)
221 			set_multicast_one(dev, ha->addr);
222 		set_multicast_finish(dev);
223 	} else
224 		set_promiscuous_mode(dev);
225 }
226 
227 static void restart(struct net_device *dev)
228 {
229 	struct fs_enet_private *fep = netdev_priv(dev);
230 	struct fec __iomem *fecp = fep->fec.fecp;
231 	const struct fs_platform_info *fpi = fep->fpi;
232 	dma_addr_t rx_bd_base_phys, tx_bd_base_phys;
233 	int r;
234 	u32 addrhi, addrlo;
235 
236 	struct mii_bus *mii = dev->phydev->mdio.bus;
237 	struct fec_info* fec_inf = mii->priv;
238 
239 	r = whack_reset(fep->fec.fecp);
240 	if (r != 0)
241 		dev_err(fep->dev, "FEC Reset FAILED!\n");
242 	/*
243 	 * Set station address.
244 	 */
245 	addrhi = ((u32) dev->dev_addr[0] << 24) |
246 		 ((u32) dev->dev_addr[1] << 16) |
247 		 ((u32) dev->dev_addr[2] <<  8) |
248 		  (u32) dev->dev_addr[3];
249 	addrlo = ((u32) dev->dev_addr[4] << 24) |
250 		 ((u32) dev->dev_addr[5] << 16);
251 	FW(fecp, addr_low, addrhi);
252 	FW(fecp, addr_high, addrlo);
253 
254 	/*
255 	 * Reset all multicast.
256 	 */
257 	FW(fecp, grp_hash_table_high, fep->fec.hthi);
258 	FW(fecp, grp_hash_table_low, fep->fec.htlo);
259 
260 	/*
261 	 * Set maximum receive buffer size.
262 	 */
263 	FW(fecp, r_buff_size, PKT_MAXBLR_SIZE);
264 #ifdef CONFIG_FS_ENET_MPC5121_FEC
265 	FW(fecp, r_cntrl, PKT_MAXBUF_SIZE << 16);
266 #else
267 	FW(fecp, r_hash, PKT_MAXBUF_SIZE);
268 #endif
269 
270 	/* get physical address */
271 	rx_bd_base_phys = fep->ring_mem_addr;
272 	tx_bd_base_phys = rx_bd_base_phys + sizeof(cbd_t) * fpi->rx_ring;
273 
274 	/*
275 	 * Set receive and transmit descriptor base.
276 	 */
277 	FW(fecp, r_des_start, rx_bd_base_phys);
278 	FW(fecp, x_des_start, tx_bd_base_phys);
279 
280 	fs_init_bds(dev);
281 
282 	/*
283 	 * Enable big endian and don't care about SDMA FC.
284 	 */
285 #ifdef CONFIG_FS_ENET_MPC5121_FEC
286 	FS(fecp, dma_control, 0xC0000000);
287 #else
288 	FW(fecp, fun_code, 0x78000000);
289 #endif
290 
291 	/*
292 	 * Set MII speed.
293 	 */
294 	FW(fecp, mii_speed, fec_inf->mii_speed);
295 
296 	/*
297 	 * Clear any outstanding interrupt.
298 	 */
299 	FW(fecp, ievent, 0xffc0);
300 #ifndef CONFIG_FS_ENET_MPC5121_FEC
301 	FW(fecp, ivec, (virq_to_hw(fep->interrupt) / 2) << 29);
302 
303 	FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE);	/* MII enable */
304 #else
305 	/*
306 	 * Only set MII/RMII mode - do not touch maximum frame length
307 	 * configured before.
308 	 */
309 	FS(fecp, r_cntrl, fpi->use_rmii ?
310 			FEC_RCNTRL_RMII_MODE : FEC_RCNTRL_MII_MODE);
311 #endif
312 	/*
313 	 * adjust to duplex mode
314 	 */
315 	if (dev->phydev->duplex) {
316 		FC(fecp, r_cntrl, FEC_RCNTRL_DRT);
317 		FS(fecp, x_cntrl, FEC_TCNTRL_FDEN);	/* FD enable */
318 	} else {
319 		FS(fecp, r_cntrl, FEC_RCNTRL_DRT);
320 		FC(fecp, x_cntrl, FEC_TCNTRL_FDEN);	/* FD disable */
321 	}
322 
323 	/* Restore multicast and promiscuous settings */
324 	set_multicast_list(dev);
325 
326 	/*
327 	 * Enable interrupts we wish to service.
328 	 */
329 	FW(fecp, imask, FEC_ENET_TXF | FEC_ENET_TXB |
330 	   FEC_ENET_RXF | FEC_ENET_RXB);
331 
332 	/*
333 	 * And last, enable the transmit and receive processing.
334 	 */
335 	FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
336 	FW(fecp, r_des_active, 0x01000000);
337 }
338 
339 static void stop(struct net_device *dev)
340 {
341 	struct fs_enet_private *fep = netdev_priv(dev);
342 	struct fec __iomem *fecp = fep->fec.fecp;
343 	int i;
344 
345 	if ((FR(fecp, ecntrl) & FEC_ECNTRL_ETHER_EN) == 0)
346 		return;		/* already down */
347 
348 	FW(fecp, x_cntrl, 0x01);	/* Graceful transmit stop */
349 	for (i = 0; ((FR(fecp, ievent) & 0x10000000) == 0) &&
350 	     i < FEC_RESET_DELAY; i++)
351 		udelay(1);
352 
353 	if (i == FEC_RESET_DELAY)
354 		dev_warn(fep->dev, "FEC timeout on graceful transmit stop\n");
355 	/*
356 	 * Disable FEC. Let only MII interrupts.
357 	 */
358 	FW(fecp, imask, 0);
359 	FC(fecp, ecntrl, FEC_ECNTRL_ETHER_EN);
360 
361 	fs_cleanup_bds(dev);
362 }
363 
364 static void napi_clear_event_fs(struct net_device *dev)
365 {
366 	struct fs_enet_private *fep = netdev_priv(dev);
367 	struct fec __iomem *fecp = fep->fec.fecp;
368 
369 	FW(fecp, ievent, FEC_NAPI_EVENT_MSK);
370 }
371 
372 static void napi_enable_fs(struct net_device *dev)
373 {
374 	struct fs_enet_private *fep = netdev_priv(dev);
375 	struct fec __iomem *fecp = fep->fec.fecp;
376 
377 	FS(fecp, imask, FEC_NAPI_EVENT_MSK);
378 }
379 
380 static void napi_disable_fs(struct net_device *dev)
381 {
382 	struct fs_enet_private *fep = netdev_priv(dev);
383 	struct fec __iomem *fecp = fep->fec.fecp;
384 
385 	FC(fecp, imask, FEC_NAPI_EVENT_MSK);
386 }
387 
388 static void rx_bd_done(struct net_device *dev)
389 {
390 	struct fs_enet_private *fep = netdev_priv(dev);
391 	struct fec __iomem *fecp = fep->fec.fecp;
392 
393 	FW(fecp, r_des_active, 0x01000000);
394 }
395 
396 static void tx_kickstart(struct net_device *dev)
397 {
398 	struct fs_enet_private *fep = netdev_priv(dev);
399 	struct fec __iomem *fecp = fep->fec.fecp;
400 
401 	FW(fecp, x_des_active, 0x01000000);
402 }
403 
404 static u32 get_int_events(struct net_device *dev)
405 {
406 	struct fs_enet_private *fep = netdev_priv(dev);
407 	struct fec __iomem *fecp = fep->fec.fecp;
408 
409 	return FR(fecp, ievent) & FR(fecp, imask);
410 }
411 
412 static void clear_int_events(struct net_device *dev, u32 int_events)
413 {
414 	struct fs_enet_private *fep = netdev_priv(dev);
415 	struct fec __iomem *fecp = fep->fec.fecp;
416 
417 	FW(fecp, ievent, int_events);
418 }
419 
420 static void ev_error(struct net_device *dev, u32 int_events)
421 {
422 	struct fs_enet_private *fep = netdev_priv(dev);
423 
424 	dev_warn(fep->dev, "FEC ERROR(s) 0x%x\n", int_events);
425 }
426 
427 static int get_regs(struct net_device *dev, void *p, int *sizep)
428 {
429 	struct fs_enet_private *fep = netdev_priv(dev);
430 
431 	if (*sizep < sizeof(struct fec))
432 		return -EINVAL;
433 
434 	memcpy_fromio(p, fep->fec.fecp, sizeof(struct fec));
435 
436 	return 0;
437 }
438 
439 static int get_regs_len(struct net_device *dev)
440 {
441 	return sizeof(struct fec);
442 }
443 
444 static void tx_restart(struct net_device *dev)
445 {
446 	/* nothing */
447 }
448 
449 /*************************************************************************/
450 
451 const struct fs_ops fs_fec_ops = {
452 	.setup_data		= setup_data,
453 	.cleanup_data		= cleanup_data,
454 	.set_multicast_list	= set_multicast_list,
455 	.restart		= restart,
456 	.stop			= stop,
457 	.napi_clear_event	= napi_clear_event_fs,
458 	.napi_enable		= napi_enable_fs,
459 	.napi_disable		= napi_disable_fs,
460 	.rx_bd_done		= rx_bd_done,
461 	.tx_kickstart		= tx_kickstart,
462 	.get_int_events		= get_int_events,
463 	.clear_int_events	= clear_int_events,
464 	.ev_error		= ev_error,
465 	.get_regs		= get_regs,
466 	.get_regs_len		= get_regs_len,
467 	.tx_restart		= tx_restart,
468 	.allocate_bd		= allocate_bd,
469 	.free_bd		= free_bd,
470 };
471 
472