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net: OpenFirmware GPIO based MDIO bitbang driver
[zen-stable.git] / drivers / net / fs_enet / mac-scc.c
blobd7ca31945c828f04f0c430e19569a98fe3c958f0
1 /*
2 * Ethernet on Serial Communications Controller (SCC) driver for Motorola MPC8xx and MPC82xx.
3 *
4 * Copyright (c) 2003 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/ioport.h>
22 #include <linux/slab.h>
23 #include <linux/interrupt.h>
24 #include <linux/init.h>
25 #include <linux/delay.h>
26 #include <linux/netdevice.h>
27 #include <linux/etherdevice.h>
28 #include <linux/skbuff.h>
29 #include <linux/spinlock.h>
30 #include <linux/mii.h>
31 #include <linux/ethtool.h>
32 #include <linux/bitops.h>
33 #include <linux/fs.h>
34 #include <linux/platform_device.h>
35
36 #include <asm/irq.h>
37 #include <asm/uaccess.h>
38
39 #ifdef CONFIG_8xx
40 #include <asm/8xx_immap.h>
41 #include <asm/pgtable.h>
42 #include <asm/mpc8xx.h>
43 #include <asm/cpm1.h>
44 #endif
45
46 #ifdef CONFIG_PPC_CPM_NEW_BINDING
47 #include <asm/of_platform.h>
48 #endif
49
50 #include "fs_enet.h"
51
52 /*************************************************/
53
54 #if defined(CONFIG_CPM1)
55 /* for a 8xx __raw_xxx's are sufficient */
56 #define __fs_out32(addr, x) __raw_writel(x, addr)
57 #define __fs_out16(addr, x) __raw_writew(x, addr)
58 #define __fs_out8(addr, x) __raw_writeb(x, addr)
59 #define __fs_in32(addr) __raw_readl(addr)
60 #define __fs_in16(addr) __raw_readw(addr)
61 #define __fs_in8(addr) __raw_readb(addr)
62 #else
63 /* for others play it safe */
64 #define __fs_out32(addr, x) out_be32(addr, x)
65 #define __fs_out16(addr, x) out_be16(addr, x)
66 #define __fs_in32(addr) in_be32(addr)
67 #define __fs_in16(addr) in_be16(addr)
68 #endif
69
70 /* write, read, set bits, clear bits */
71 #define W32(_p, _m, _v) __fs_out32(&(_p)->_m, (_v))
72 #define R32(_p, _m) __fs_in32(&(_p)->_m)
73 #define S32(_p, _m, _v) W32(_p, _m, R32(_p, _m) | (_v))
74 #define C32(_p, _m, _v) W32(_p, _m, R32(_p, _m) & ~(_v))
75
76 #define W16(_p, _m, _v) __fs_out16(&(_p)->_m, (_v))
77 #define R16(_p, _m) __fs_in16(&(_p)->_m)
78 #define S16(_p, _m, _v) W16(_p, _m, R16(_p, _m) | (_v))
79 #define C16(_p, _m, _v) W16(_p, _m, R16(_p, _m) & ~(_v))
80
81 #define W8(_p, _m, _v) __fs_out8(&(_p)->_m, (_v))
82 #define R8(_p, _m) __fs_in8(&(_p)->_m)
83 #define S8(_p, _m, _v) W8(_p, _m, R8(_p, _m) | (_v))
84 #define C8(_p, _m, _v) W8(_p, _m, R8(_p, _m) & ~(_v))
85
86 #define SCC_MAX_MULTICAST_ADDRS 64
87
88 /*
89 * Delay to wait for SCC reset command to complete (in us)
90 */
91 #define SCC_RESET_DELAY 50
92
93 static inline int scc_cr_cmd(struct fs_enet_private *fep, u32 op)
94 {
95 const struct fs_platform_info *fpi = fep->fpi;
96
97 return cpm_command(fpi->cp_command, op);
98 }
99
100 static int do_pd_setup(struct fs_enet_private *fep)
101 {
102 #ifdef CONFIG_PPC_CPM_NEW_BINDING
103 struct of_device *ofdev = to_of_device(fep->dev);
104
105 fep->interrupt = of_irq_to_resource(ofdev->node, 0, NULL);
106 if (fep->interrupt == NO_IRQ)
107 return -EINVAL;
108
109 fep->scc.sccp = of_iomap(ofdev->node, 0);
110 if (!fep->scc.sccp)
111 return -EINVAL;
112
113 fep->scc.ep = of_iomap(ofdev->node, 1);
114 if (!fep->scc.ep) {
115 iounmap(fep->scc.sccp);
116 return -EINVAL;
117 }
118 #else
119 struct platform_device *pdev = to_platform_device(fep->dev);
120 struct resource *r;
121
122 /* Fill out IRQ field */
123 fep->interrupt = platform_get_irq_byname(pdev, "interrupt");
124 if (fep->interrupt < 0)
125 return -EINVAL;
126
127 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
128 fep->scc.sccp = ioremap(r->start, r->end - r->start + 1);
129
130 if (fep->scc.sccp == NULL)
131 return -EINVAL;
132
133 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pram");
134 fep->scc.ep = ioremap(r->start, r->end - r->start + 1);
135
136 if (fep->scc.ep == NULL)
137 return -EINVAL;
138 #endif
139
140 return 0;
141 }
142
143 #define SCC_NAPI_RX_EVENT_MSK (SCCE_ENET_RXF | SCCE_ENET_RXB)
144 #define SCC_RX_EVENT (SCCE_ENET_RXF)
145 #define SCC_TX_EVENT (SCCE_ENET_TXB)
146 #define SCC_ERR_EVENT_MSK (SCCE_ENET_TXE | SCCE_ENET_BSY)
147
148 static int setup_data(struct net_device *dev)
149 {
150 struct fs_enet_private *fep = netdev_priv(dev);
151
152 #ifndef CONFIG_PPC_CPM_NEW_BINDING
153 struct fs_platform_info *fpi = fep->fpi;
154
155 fep->scc.idx = fs_get_scc_index(fpi->fs_no);
156 if ((unsigned int)fep->fcc.idx >= 4) /* max 4 SCCs */
157 return -EINVAL;
158
159 fpi->cp_command = fep->fcc.idx << 6;
160 #endif
161
162 do_pd_setup(fep);
163
164 fep->scc.hthi = 0;
165 fep->scc.htlo = 0;
166
167 fep->ev_napi_rx = SCC_NAPI_RX_EVENT_MSK;
168 fep->ev_rx = SCC_RX_EVENT;
169 fep->ev_tx = SCC_TX_EVENT | SCCE_ENET_TXE;
170 fep->ev_err = SCC_ERR_EVENT_MSK;
171
172 return 0;
173 }
174
175 static int allocate_bd(struct net_device *dev)
176 {
177 struct fs_enet_private *fep = netdev_priv(dev);
178 const struct fs_platform_info *fpi = fep->fpi;
179
180 fep->ring_mem_addr = cpm_dpalloc((fpi->tx_ring + fpi->rx_ring) *
181 sizeof(cbd_t), 8);
182 if (IS_ERR_VALUE(fep->ring_mem_addr))
183 return -ENOMEM;
184
185 fep->ring_base = (void __iomem __force*)
186 cpm_dpram_addr(fep->ring_mem_addr);
187
188 return 0;
189 }
190
191 static void free_bd(struct net_device *dev)
192 {
193 struct fs_enet_private *fep = netdev_priv(dev);
194
195 if (fep->ring_base)
196 cpm_dpfree(fep->ring_mem_addr);
197 }
198
199 static void cleanup_data(struct net_device *dev)
200 {
201 /* nothing */
202 }
203
204 static void set_promiscuous_mode(struct net_device *dev)
205 {
206 struct fs_enet_private *fep = netdev_priv(dev);
207 scc_t __iomem *sccp = fep->scc.sccp;
208
209 S16(sccp, scc_psmr, SCC_PSMR_PRO);
210 }
211
212 static void set_multicast_start(struct net_device *dev)
213 {
214 struct fs_enet_private *fep = netdev_priv(dev);
215 scc_enet_t __iomem *ep = fep->scc.ep;
216
217 W16(ep, sen_gaddr1, 0);
218 W16(ep, sen_gaddr2, 0);
219 W16(ep, sen_gaddr3, 0);
220 W16(ep, sen_gaddr4, 0);
221 }
222
223 static void set_multicast_one(struct net_device *dev, const u8 * mac)
224 {
225 struct fs_enet_private *fep = netdev_priv(dev);
226 scc_enet_t __iomem *ep = fep->scc.ep;
227 u16 taddrh, taddrm, taddrl;
228
229 taddrh = ((u16) mac[5] << 8) | mac[4];
230 taddrm = ((u16) mac[3] << 8) | mac[2];
231 taddrl = ((u16) mac[1] << 8) | mac[0];
232
233 W16(ep, sen_taddrh, taddrh);
234 W16(ep, sen_taddrm, taddrm);
235 W16(ep, sen_taddrl, taddrl);
236 scc_cr_cmd(fep, CPM_CR_SET_GADDR);
237 }
238
239 static void set_multicast_finish(struct net_device *dev)
240 {
241 struct fs_enet_private *fep = netdev_priv(dev);
242 scc_t __iomem *sccp = fep->scc.sccp;
243 scc_enet_t __iomem *ep = fep->scc.ep;
244
245 /* clear promiscuous always */
246 C16(sccp, scc_psmr, SCC_PSMR_PRO);
247
248 /* if all multi or too many multicasts; just enable all */
249 if ((dev->flags & IFF_ALLMULTI) != 0 ||
250 dev->mc_count > SCC_MAX_MULTICAST_ADDRS) {
251
252 W16(ep, sen_gaddr1, 0xffff);
253 W16(ep, sen_gaddr2, 0xffff);
254 W16(ep, sen_gaddr3, 0xffff);
255 W16(ep, sen_gaddr4, 0xffff);
256 }
257 }
258
259 static void set_multicast_list(struct net_device *dev)
260 {
261 struct dev_mc_list *pmc;
262
263 if ((dev->flags & IFF_PROMISC) == 0) {
264 set_multicast_start(dev);
265 for (pmc = dev->mc_list; pmc != NULL; pmc = pmc->next)
266 set_multicast_one(dev, pmc->dmi_addr);
267 set_multicast_finish(dev);
268 } else
269 set_promiscuous_mode(dev);
270 }
271
272 /*
273 * This function is called to start or restart the FEC during a link
274 * change. This only happens when switching between half and full
275 * duplex.
276 */
277 static void restart(struct net_device *dev)
278 {
279 struct fs_enet_private *fep = netdev_priv(dev);
280 scc_t __iomem *sccp = fep->scc.sccp;
281 scc_enet_t __iomem *ep = fep->scc.ep;
282 const struct fs_platform_info *fpi = fep->fpi;
283 u16 paddrh, paddrm, paddrl;
284 const unsigned char *mac;
285 int i;
286
287 C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
288
289 /* clear everything (slow & steady does it) */
290 for (i = 0; i < sizeof(*ep); i++)
291 __fs_out8((u8 __iomem *)ep + i, 0);
292
293 /* point to bds */
294 W16(ep, sen_genscc.scc_rbase, fep->ring_mem_addr);
295 W16(ep, sen_genscc.scc_tbase,
296 fep->ring_mem_addr + sizeof(cbd_t) * fpi->rx_ring);
297
298 /* Initialize function code registers for big-endian.
299 */
300 W8(ep, sen_genscc.scc_rfcr, SCC_EB);
301 W8(ep, sen_genscc.scc_tfcr, SCC_EB);
302
303 /* Set maximum bytes per receive buffer.
304 * This appears to be an Ethernet frame size, not the buffer
305 * fragment size. It must be a multiple of four.
306 */
307 W16(ep, sen_genscc.scc_mrblr, 0x5f0);
308
309 /* Set CRC preset and mask.
310 */
311 W32(ep, sen_cpres, 0xffffffff);
312 W32(ep, sen_cmask, 0xdebb20e3);
313
314 W32(ep, sen_crcec, 0); /* CRC Error counter */
315 W32(ep, sen_alec, 0); /* alignment error counter */
316 W32(ep, sen_disfc, 0); /* discard frame counter */
317
318 W16(ep, sen_pads, 0x8888); /* Tx short frame pad character */
319 W16(ep, sen_retlim, 15); /* Retry limit threshold */
320
321 W16(ep, sen_maxflr, 0x5ee); /* maximum frame length register */
322
323 W16(ep, sen_minflr, PKT_MINBUF_SIZE); /* minimum frame length register */
324
325 W16(ep, sen_maxd1, 0x000005f0); /* maximum DMA1 length */
326 W16(ep, sen_maxd2, 0x000005f0); /* maximum DMA2 length */
327
328 /* Clear hash tables.
329 */
330 W16(ep, sen_gaddr1, 0);
331 W16(ep, sen_gaddr2, 0);
332 W16(ep, sen_gaddr3, 0);
333 W16(ep, sen_gaddr4, 0);
334 W16(ep, sen_iaddr1, 0);
335 W16(ep, sen_iaddr2, 0);
336 W16(ep, sen_iaddr3, 0);
337 W16(ep, sen_iaddr4, 0);
338
339 /* set address
340 */
341 mac = dev->dev_addr;
342 paddrh = ((u16) mac[5] << 8) | mac[4];
343 paddrm = ((u16) mac[3] << 8) | mac[2];
344 paddrl = ((u16) mac[1] << 8) | mac[0];
345
346 W16(ep, sen_paddrh, paddrh);
347 W16(ep, sen_paddrm, paddrm);
348 W16(ep, sen_paddrl, paddrl);
349
350 W16(ep, sen_pper, 0);
351 W16(ep, sen_taddrl, 0);
352 W16(ep, sen_taddrm, 0);
353 W16(ep, sen_taddrh, 0);
354
355 fs_init_bds(dev);
356
357 scc_cr_cmd(fep, CPM_CR_INIT_TRX);
358
359 W16(sccp, scc_scce, 0xffff);
360
361 /* Enable interrupts we wish to service.
362 */
363 W16(sccp, scc_sccm, SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);
364
365 /* Set GSMR_H to enable all normal operating modes.
366 * Set GSMR_L to enable Ethernet to MC68160.
367 */
368 W32(sccp, scc_gsmrh, 0);
369 W32(sccp, scc_gsmrl,
370 SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 |
371 SCC_GSMRL_MODE_ENET);
372
373 /* Set sync/delimiters.
374 */
375 W16(sccp, scc_dsr, 0xd555);
376
377 /* Set processing mode. Use Ethernet CRC, catch broadcast, and
378 * start frame search 22 bit times after RENA.
379 */
380 W16(sccp, scc_psmr, SCC_PSMR_ENCRC | SCC_PSMR_NIB22);
381
382 /* Set full duplex mode if needed */
383 if (fep->phydev->duplex)
384 S16(sccp, scc_psmr, SCC_PSMR_LPB | SCC_PSMR_FDE);
385
386 S32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
387 }
388
389 static void stop(struct net_device *dev)
390 {
391 struct fs_enet_private *fep = netdev_priv(dev);
392 scc_t __iomem *sccp = fep->scc.sccp;
393 int i;
394
395 for (i = 0; (R16(sccp, scc_sccm) == 0) && i < SCC_RESET_DELAY; i++)
396 udelay(1);
397
398 if (i == SCC_RESET_DELAY)
399 printk(KERN_WARNING DRV_MODULE_NAME
400 ": %s SCC timeout on graceful transmit stop\n",
401 dev->name);
402
403 W16(sccp, scc_sccm, 0);
404 C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
405
406 fs_cleanup_bds(dev);
407 }
408
409 static void pre_request_irq(struct net_device *dev, int irq)
410 {
411 #ifndef CONFIG_PPC_MERGE
412 immap_t *immap = fs_enet_immap;
413 u32 siel;
414
415 /* SIU interrupt */
416 if (irq >= SIU_IRQ0 && irq < SIU_LEVEL7) {
417
418 siel = in_be32(&immap->im_siu_conf.sc_siel);
419 if ((irq & 1) == 0)
420 siel |= (0x80000000 >> irq);
421 else
422 siel &= ~(0x80000000 >> (irq & ~1));
423 out_be32(&immap->im_siu_conf.sc_siel, siel);
424 }
425 #endif
426 }
427
428 static void post_free_irq(struct net_device *dev, int irq)
429 {
430 /* nothing */
431 }
432
433 static void napi_clear_rx_event(struct net_device *dev)
434 {
435 struct fs_enet_private *fep = netdev_priv(dev);
436 scc_t __iomem *sccp = fep->scc.sccp;
437
438 W16(sccp, scc_scce, SCC_NAPI_RX_EVENT_MSK);
439 }
440
441 static void napi_enable_rx(struct net_device *dev)
442 {
443 struct fs_enet_private *fep = netdev_priv(dev);
444 scc_t __iomem *sccp = fep->scc.sccp;
445
446 S16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
447 }
448
449 static void napi_disable_rx(struct net_device *dev)
450 {
451 struct fs_enet_private *fep = netdev_priv(dev);
452 scc_t __iomem *sccp = fep->scc.sccp;
453
454 C16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
455 }
456
457 static void rx_bd_done(struct net_device *dev)
458 {
459 /* nothing */
460 }
461
462 static void tx_kickstart(struct net_device *dev)
463 {
464 /* nothing */
465 }
466
467 static u32 get_int_events(struct net_device *dev)
468 {
469 struct fs_enet_private *fep = netdev_priv(dev);
470 scc_t __iomem *sccp = fep->scc.sccp;
471
472 return (u32) R16(sccp, scc_scce);
473 }
474
475 static void clear_int_events(struct net_device *dev, u32 int_events)
476 {
477 struct fs_enet_private *fep = netdev_priv(dev);
478 scc_t __iomem *sccp = fep->scc.sccp;
479
480 W16(sccp, scc_scce, int_events & 0xffff);
481 }
482
483 static void ev_error(struct net_device *dev, u32 int_events)
484 {
485 printk(KERN_WARNING DRV_MODULE_NAME
486 ": %s SCC ERROR(s) 0x%x\n", dev->name, int_events);
487 }
488
489 static int get_regs(struct net_device *dev, void *p, int *sizep)
490 {
491 struct fs_enet_private *fep = netdev_priv(dev);
492
493 if (*sizep < sizeof(scc_t) + sizeof(scc_enet_t __iomem *))
494 return -EINVAL;
495
496 memcpy_fromio(p, fep->scc.sccp, sizeof(scc_t));
497 p = (char *)p + sizeof(scc_t);
498
499 memcpy_fromio(p, fep->scc.ep, sizeof(scc_enet_t __iomem *));
500
501 return 0;
502 }
503
504 static int get_regs_len(struct net_device *dev)
505 {
506 return sizeof(scc_t) + sizeof(scc_enet_t __iomem *);
507 }
508
509 static void tx_restart(struct net_device *dev)
510 {
511 struct fs_enet_private *fep = netdev_priv(dev);
512
513 scc_cr_cmd(fep, CPM_CR_RESTART_TX);
514 }
515
516
517
518 /*************************************************************************/
519
520 const struct fs_ops fs_scc_ops = {
521 .setup_data = setup_data,
522 .cleanup_data = cleanup_data,
523 .set_multicast_list = set_multicast_list,
524 .restart = restart,
525 .stop = stop,
526 .pre_request_irq = pre_request_irq,
527 .post_free_irq = post_free_irq,
528 .napi_clear_rx_event = napi_clear_rx_event,
529 .napi_enable_rx = napi_enable_rx,
530 .napi_disable_rx = napi_disable_rx,
531 .rx_bd_done = rx_bd_done,
532 .tx_kickstart = tx_kickstart,
533 .get_int_events = get_int_events,
534 .clear_int_events = clear_int_events,
535 .ev_error = ev_error,
536 .get_regs = get_regs,
537 .get_regs_len = get_regs_len,
538 .tx_restart = tx_restart,
539 .allocate_bd = allocate_bd,
540 .free_bd = free_bd,
541 };