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1577ecef AF |
1 | /* |
2 | * Freescale PowerQUICC Ethernet Driver -- MIIM bus implementation | |
3 | * Provides Bus interface for MIIM regs | |
4 | * | |
5 | * Author: Andy Fleming <afleming@freescale.com> | |
1d2397d7 | 6 | * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com> |
1577ecef | 7 | * |
1d2397d7 | 8 | * Copyright 2002-2004, 2008-2009 Freescale Semiconductor, Inc. |
1577ecef AF |
9 | * |
10 | * Based on gianfar_mii.c and ucc_geth_mii.c (Li Yang, Kim Phillips) | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/etherdevice.h> | |
29 | #include <linux/skbuff.h> | |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/mm.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/platform_device.h> | |
34 | #include <linux/crc32.h> | |
35 | #include <linux/mii.h> | |
36 | #include <linux/phy.h> | |
37 | #include <linux/of.h> | |
22ae782f | 38 | #include <linux/of_address.h> |
324931ba | 39 | #include <linux/of_mdio.h> |
1577ecef AF |
40 | #include <linux/of_platform.h> |
41 | ||
42 | #include <asm/io.h> | |
43 | #include <asm/irq.h> | |
44 | #include <asm/uaccess.h> | |
45 | #include <asm/ucc.h> | |
46 | ||
47 | #include "gianfar.h" | |
48 | #include "fsl_pq_mdio.h" | |
49 | ||
b3319b10 AV |
50 | struct fsl_pq_mdio_priv { |
51 | void __iomem *map; | |
52 | struct fsl_pq_mdio __iomem *regs; | |
53 | }; | |
54 | ||
1577ecef AF |
55 | /* |
56 | * Write value to the PHY at mii_id at register regnum, | |
57 | * on the bus attached to the local interface, which may be different from the | |
58 | * generic mdio bus (tied to a single interface), waiting until the write is | |
59 | * done before returning. This is helpful in programming interfaces like | |
60 | * the TBI which control interfaces like onchip SERDES and are always tied to | |
61 | * the local mdio pins, which may not be the same as system mdio bus, used for | |
62 | * controlling the external PHYs, for example. | |
63 | */ | |
64 | int fsl_pq_local_mdio_write(struct fsl_pq_mdio __iomem *regs, int mii_id, | |
65 | int regnum, u16 value) | |
66 | { | |
67 | /* Set the PHY address and the register address we want to write */ | |
68 | out_be32(®s->miimadd, (mii_id << 8) | regnum); | |
69 | ||
70 | /* Write out the value we want */ | |
71 | out_be32(®s->miimcon, value); | |
72 | ||
73 | /* Wait for the transaction to finish */ | |
74 | while (in_be32(®s->miimind) & MIIMIND_BUSY) | |
75 | cpu_relax(); | |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | /* | |
81 | * Read the bus for PHY at addr mii_id, register regnum, and | |
82 | * return the value. Clears miimcom first. All PHY operation | |
83 | * done on the bus attached to the local interface, | |
84 | * which may be different from the generic mdio bus | |
85 | * This is helpful in programming interfaces like | |
86 | * the TBI which, in turn, control interfaces like onchip SERDES | |
87 | * and are always tied to the local mdio pins, which may not be the | |
88 | * same as system mdio bus, used for controlling the external PHYs, for eg. | |
89 | */ | |
90 | int fsl_pq_local_mdio_read(struct fsl_pq_mdio __iomem *regs, | |
91 | int mii_id, int regnum) | |
92 | { | |
93 | u16 value; | |
94 | ||
95 | /* Set the PHY address and the register address we want to read */ | |
96 | out_be32(®s->miimadd, (mii_id << 8) | regnum); | |
97 | ||
98 | /* Clear miimcom, and then initiate a read */ | |
99 | out_be32(®s->miimcom, 0); | |
100 | out_be32(®s->miimcom, MII_READ_COMMAND); | |
101 | ||
102 | /* Wait for the transaction to finish */ | |
103 | while (in_be32(®s->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY)) | |
104 | cpu_relax(); | |
105 | ||
106 | /* Grab the value of the register from miimstat */ | |
107 | value = in_be32(®s->miimstat); | |
108 | ||
109 | return value; | |
110 | } | |
111 | ||
6748f60b AV |
112 | static struct fsl_pq_mdio __iomem *fsl_pq_mdio_get_regs(struct mii_bus *bus) |
113 | { | |
b3319b10 AV |
114 | struct fsl_pq_mdio_priv *priv = bus->priv; |
115 | ||
116 | return priv->regs; | |
6748f60b AV |
117 | } |
118 | ||
1577ecef AF |
119 | /* |
120 | * Write value to the PHY at mii_id at register regnum, | |
121 | * on the bus, waiting until the write is done before returning. | |
122 | */ | |
123 | int fsl_pq_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value) | |
124 | { | |
6748f60b | 125 | struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus); |
1577ecef AF |
126 | |
127 | /* Write to the local MII regs */ | |
807540ba | 128 | return fsl_pq_local_mdio_write(regs, mii_id, regnum, value); |
1577ecef AF |
129 | } |
130 | ||
131 | /* | |
132 | * Read the bus for PHY at addr mii_id, register regnum, and | |
133 | * return the value. Clears miimcom first. | |
134 | */ | |
135 | int fsl_pq_mdio_read(struct mii_bus *bus, int mii_id, int regnum) | |
136 | { | |
6748f60b | 137 | struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus); |
1577ecef AF |
138 | |
139 | /* Read the local MII regs */ | |
807540ba | 140 | return fsl_pq_local_mdio_read(regs, mii_id, regnum); |
1577ecef AF |
141 | } |
142 | ||
143 | /* Reset the MIIM registers, and wait for the bus to free */ | |
144 | static int fsl_pq_mdio_reset(struct mii_bus *bus) | |
145 | { | |
6748f60b | 146 | struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus); |
508827ff | 147 | int timeout = PHY_INIT_TIMEOUT; |
1577ecef AF |
148 | |
149 | mutex_lock(&bus->mdio_lock); | |
150 | ||
151 | /* Reset the management interface */ | |
152 | out_be32(®s->miimcfg, MIIMCFG_RESET); | |
153 | ||
154 | /* Setup the MII Mgmt clock speed */ | |
155 | out_be32(®s->miimcfg, MIIMCFG_INIT_VALUE); | |
156 | ||
157 | /* Wait until the bus is free */ | |
158 | while ((in_be32(®s->miimind) & MIIMIND_BUSY) && timeout--) | |
159 | cpu_relax(); | |
160 | ||
161 | mutex_unlock(&bus->mdio_lock); | |
162 | ||
508827ff | 163 | if (timeout < 0) { |
1577ecef AF |
164 | printk(KERN_ERR "%s: The MII Bus is stuck!\n", |
165 | bus->name); | |
166 | return -EBUSY; | |
167 | } | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
1577ecef AF |
172 | void fsl_pq_mdio_bus_name(char *name, struct device_node *np) |
173 | { | |
18f27383 AV |
174 | const u32 *addr; |
175 | u64 taddr = OF_BAD_ADDR; | |
1577ecef | 176 | |
18f27383 AV |
177 | addr = of_get_address(np, 0, NULL, NULL); |
178 | if (addr) | |
179 | taddr = of_translate_address(np, addr); | |
1577ecef | 180 | |
18f27383 AV |
181 | snprintf(name, MII_BUS_ID_SIZE, "%s@%llx", np->name, |
182 | (unsigned long long)taddr); | |
1577ecef | 183 | } |
b6bc978b | 184 | EXPORT_SYMBOL_GPL(fsl_pq_mdio_bus_name); |
1577ecef AF |
185 | |
186 | /* Scan the bus in reverse, looking for an empty spot */ | |
187 | static int fsl_pq_mdio_find_free(struct mii_bus *new_bus) | |
188 | { | |
189 | int i; | |
190 | ||
191 | for (i = PHY_MAX_ADDR; i > 0; i--) { | |
192 | u32 phy_id; | |
193 | ||
194 | if (get_phy_id(new_bus, i, &phy_id)) | |
195 | return -1; | |
196 | ||
197 | if (phy_id == 0xffffffff) | |
198 | break; | |
199 | } | |
200 | ||
201 | return i; | |
202 | } | |
203 | ||
204 | ||
e2a61fa3 | 205 | #if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE) |
1d2397d7 | 206 | static u32 __iomem *get_gfar_tbipa(struct fsl_pq_mdio __iomem *regs, struct device_node *np) |
1577ecef AF |
207 | { |
208 | struct gfar __iomem *enet_regs; | |
209 | ||
210 | /* | |
211 | * This is mildly evil, but so is our hardware for doing this. | |
212 | * Also, we have to cast back to struct gfar because of | |
213 | * definition weirdness done in gianfar.h. | |
214 | */ | |
1d2397d7 SG |
215 | if(of_device_is_compatible(np, "fsl,gianfar-mdio") || |
216 | of_device_is_compatible(np, "fsl,gianfar-tbi") || | |
217 | of_device_is_compatible(np, "gianfar")) { | |
218 | enet_regs = (struct gfar __iomem *)regs; | |
219 | return &enet_regs->tbipa; | |
220 | } else if (of_device_is_compatible(np, "fsl,etsec2-mdio") || | |
221 | of_device_is_compatible(np, "fsl,etsec2-tbi")) { | |
3b1fd3e5 | 222 | return of_iomap(np, 1); |
1d2397d7 SG |
223 | } else |
224 | return NULL; | |
1577ecef AF |
225 | } |
226 | #endif | |
227 | ||
228 | ||
e2a61fa3 | 229 | #if defined(CONFIG_UCC_GETH) || defined(CONFIG_UCC_GETH_MODULE) |
1577ecef AF |
230 | static int get_ucc_id_for_range(u64 start, u64 end, u32 *ucc_id) |
231 | { | |
232 | struct device_node *np = NULL; | |
233 | int err = 0; | |
234 | ||
235 | for_each_compatible_node(np, NULL, "ucc_geth") { | |
236 | struct resource tempres; | |
237 | ||
238 | err = of_address_to_resource(np, 0, &tempres); | |
239 | if (err) | |
240 | continue; | |
241 | ||
242 | /* if our mdio regs fall within this UCC regs range */ | |
243 | if ((start >= tempres.start) && (end <= tempres.end)) { | |
244 | /* Find the id of the UCC */ | |
245 | const u32 *id; | |
246 | ||
247 | id = of_get_property(np, "cell-index", NULL); | |
248 | if (!id) { | |
249 | id = of_get_property(np, "device-id", NULL); | |
250 | if (!id) | |
251 | continue; | |
252 | } | |
253 | ||
254 | *ucc_id = *id; | |
255 | ||
256 | return 0; | |
257 | } | |
258 | } | |
259 | ||
260 | if (err) | |
261 | return err; | |
262 | else | |
263 | return -EINVAL; | |
264 | } | |
265 | #endif | |
266 | ||
267 | ||
2dc11581 | 268 | static int fsl_pq_mdio_probe(struct platform_device *ofdev, |
1577ecef AF |
269 | const struct of_device_id *match) |
270 | { | |
61c7a080 | 271 | struct device_node *np = ofdev->dev.of_node; |
1577ecef | 272 | struct device_node *tbi; |
b3319b10 | 273 | struct fsl_pq_mdio_priv *priv; |
1d2397d7 | 274 | struct fsl_pq_mdio __iomem *regs = NULL; |
2951d64e | 275 | void __iomem *map; |
1577ecef AF |
276 | u32 __iomem *tbipa; |
277 | struct mii_bus *new_bus; | |
278 | int tbiaddr = -1; | |
3b1fd3e5 | 279 | const u32 *addrp; |
2951d64e | 280 | u64 addr = 0, size = 0; |
08d18f3b | 281 | int err; |
1577ecef | 282 | |
b3319b10 AV |
283 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
284 | if (!priv) | |
285 | return -ENOMEM; | |
286 | ||
1577ecef | 287 | new_bus = mdiobus_alloc(); |
08d18f3b AV |
288 | if (!new_bus) { |
289 | err = -ENOMEM; | |
b3319b10 | 290 | goto err_free_priv; |
08d18f3b | 291 | } |
1577ecef AF |
292 | |
293 | new_bus->name = "Freescale PowerQUICC MII Bus", | |
294 | new_bus->read = &fsl_pq_mdio_read, | |
295 | new_bus->write = &fsl_pq_mdio_write, | |
296 | new_bus->reset = &fsl_pq_mdio_reset, | |
b3319b10 | 297 | new_bus->priv = priv; |
1577ecef AF |
298 | fsl_pq_mdio_bus_name(new_bus->id, np); |
299 | ||
3b1fd3e5 AV |
300 | addrp = of_get_address(np, 0, &size, NULL); |
301 | if (!addrp) { | |
302 | err = -EINVAL; | |
303 | goto err_free_bus; | |
304 | } | |
305 | ||
1577ecef | 306 | /* Set the PHY base address */ |
3b1fd3e5 AV |
307 | addr = of_translate_address(np, addrp); |
308 | if (addr == OF_BAD_ADDR) { | |
309 | err = -EINVAL; | |
310 | goto err_free_bus; | |
311 | } | |
312 | ||
2951d64e AV |
313 | map = ioremap(addr, size); |
314 | if (!map) { | |
1577ecef AF |
315 | err = -ENOMEM; |
316 | goto err_free_bus; | |
317 | } | |
b3319b10 | 318 | priv->map = map; |
1577ecef | 319 | |
2951d64e AV |
320 | if (of_device_is_compatible(np, "fsl,gianfar-mdio") || |
321 | of_device_is_compatible(np, "fsl,gianfar-tbi") || | |
322 | of_device_is_compatible(np, "fsl,ucc-mdio") || | |
323 | of_device_is_compatible(np, "ucc_geth_phy")) | |
324 | map -= offsetof(struct fsl_pq_mdio, miimcfg); | |
325 | regs = map; | |
b3319b10 | 326 | priv->regs = regs; |
1577ecef | 327 | |
324931ba | 328 | new_bus->irq = kcalloc(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL); |
1577ecef AF |
329 | |
330 | if (NULL == new_bus->irq) { | |
331 | err = -ENOMEM; | |
332 | goto err_unmap_regs; | |
333 | } | |
334 | ||
335 | new_bus->parent = &ofdev->dev; | |
336 | dev_set_drvdata(&ofdev->dev, new_bus); | |
337 | ||
338 | if (of_device_is_compatible(np, "fsl,gianfar-mdio") || | |
30196845 | 339 | of_device_is_compatible(np, "fsl,gianfar-tbi") || |
1d2397d7 SG |
340 | of_device_is_compatible(np, "fsl,etsec2-mdio") || |
341 | of_device_is_compatible(np, "fsl,etsec2-tbi") || | |
1577ecef | 342 | of_device_is_compatible(np, "gianfar")) { |
e2a61fa3 | 343 | #if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE) |
1d2397d7 SG |
344 | tbipa = get_gfar_tbipa(regs, np); |
345 | if (!tbipa) { | |
346 | err = -EINVAL; | |
347 | goto err_free_irqs; | |
348 | } | |
1577ecef AF |
349 | #else |
350 | err = -ENODEV; | |
351 | goto err_free_irqs; | |
352 | #endif | |
353 | } else if (of_device_is_compatible(np, "fsl,ucc-mdio") || | |
354 | of_device_is_compatible(np, "ucc_geth_phy")) { | |
e2a61fa3 | 355 | #if defined(CONFIG_UCC_GETH) || defined(CONFIG_UCC_GETH_MODULE) |
1577ecef | 356 | u32 id; |
fbcc0e2c | 357 | static u32 mii_mng_master; |
1577ecef AF |
358 | |
359 | tbipa = ®s->utbipar; | |
360 | ||
361 | if ((err = get_ucc_id_for_range(addr, addr + size, &id))) | |
362 | goto err_free_irqs; | |
363 | ||
fbcc0e2c HW |
364 | if (!mii_mng_master) { |
365 | mii_mng_master = id; | |
366 | ucc_set_qe_mux_mii_mng(id - 1); | |
367 | } | |
1577ecef AF |
368 | #else |
369 | err = -ENODEV; | |
370 | goto err_free_irqs; | |
371 | #endif | |
372 | } else { | |
373 | err = -ENODEV; | |
374 | goto err_free_irqs; | |
375 | } | |
376 | ||
377 | for_each_child_of_node(np, tbi) { | |
378 | if (!strncmp(tbi->type, "tbi-phy", 8)) | |
379 | break; | |
380 | } | |
381 | ||
382 | if (tbi) { | |
383 | const u32 *prop = of_get_property(tbi, "reg", NULL); | |
384 | ||
385 | if (prop) | |
386 | tbiaddr = *prop; | |
387 | } | |
388 | ||
389 | if (tbiaddr == -1) { | |
390 | out_be32(tbipa, 0); | |
391 | ||
392 | tbiaddr = fsl_pq_mdio_find_free(new_bus); | |
393 | } | |
394 | ||
395 | /* | |
396 | * We define TBIPA at 0 to be illegal, opting to fail for boards that | |
397 | * have PHYs at 1-31, rather than change tbipa and rescan. | |
398 | */ | |
399 | if (tbiaddr == 0) { | |
400 | err = -EBUSY; | |
401 | ||
402 | goto err_free_irqs; | |
403 | } | |
404 | ||
405 | out_be32(tbipa, tbiaddr); | |
406 | ||
324931ba | 407 | err = of_mdiobus_register(new_bus, np); |
1577ecef AF |
408 | if (err) { |
409 | printk (KERN_ERR "%s: Cannot register as MDIO bus\n", | |
410 | new_bus->name); | |
411 | goto err_free_irqs; | |
412 | } | |
413 | ||
414 | return 0; | |
415 | ||
416 | err_free_irqs: | |
417 | kfree(new_bus->irq); | |
418 | err_unmap_regs: | |
b3319b10 | 419 | iounmap(priv->map); |
1577ecef AF |
420 | err_free_bus: |
421 | kfree(new_bus); | |
b3319b10 AV |
422 | err_free_priv: |
423 | kfree(priv); | |
1577ecef AF |
424 | return err; |
425 | } | |
426 | ||
427 | ||
2dc11581 | 428 | static int fsl_pq_mdio_remove(struct platform_device *ofdev) |
1577ecef AF |
429 | { |
430 | struct device *device = &ofdev->dev; | |
431 | struct mii_bus *bus = dev_get_drvdata(device); | |
b3319b10 | 432 | struct fsl_pq_mdio_priv *priv = bus->priv; |
1577ecef AF |
433 | |
434 | mdiobus_unregister(bus); | |
435 | ||
436 | dev_set_drvdata(device, NULL); | |
437 | ||
b3319b10 | 438 | iounmap(priv->map); |
1577ecef AF |
439 | bus->priv = NULL; |
440 | mdiobus_free(bus); | |
b3319b10 | 441 | kfree(priv); |
1577ecef AF |
442 | |
443 | return 0; | |
444 | } | |
445 | ||
446 | static struct of_device_id fsl_pq_mdio_match[] = { | |
447 | { | |
448 | .type = "mdio", | |
449 | .compatible = "ucc_geth_phy", | |
450 | }, | |
451 | { | |
452 | .type = "mdio", | |
453 | .compatible = "gianfar", | |
454 | }, | |
455 | { | |
456 | .compatible = "fsl,ucc-mdio", | |
457 | }, | |
458 | { | |
459 | .compatible = "fsl,gianfar-tbi", | |
460 | }, | |
461 | { | |
462 | .compatible = "fsl,gianfar-mdio", | |
463 | }, | |
1d2397d7 SG |
464 | { |
465 | .compatible = "fsl,etsec2-tbi", | |
466 | }, | |
467 | { | |
468 | .compatible = "fsl,etsec2-mdio", | |
469 | }, | |
1577ecef AF |
470 | {}, |
471 | }; | |
e72701ac | 472 | MODULE_DEVICE_TABLE(of, fsl_pq_mdio_match); |
1577ecef AF |
473 | |
474 | static struct of_platform_driver fsl_pq_mdio_driver = { | |
4018294b GL |
475 | .driver = { |
476 | .name = "fsl-pq_mdio", | |
477 | .owner = THIS_MODULE, | |
478 | .of_match_table = fsl_pq_mdio_match, | |
479 | }, | |
1577ecef AF |
480 | .probe = fsl_pq_mdio_probe, |
481 | .remove = fsl_pq_mdio_remove, | |
1577ecef AF |
482 | }; |
483 | ||
484 | int __init fsl_pq_mdio_init(void) | |
485 | { | |
486 | return of_register_platform_driver(&fsl_pq_mdio_driver); | |
487 | } | |
434e7b0d | 488 | module_init(fsl_pq_mdio_init); |
1577ecef AF |
489 | |
490 | void fsl_pq_mdio_exit(void) | |
491 | { | |
492 | of_unregister_platform_driver(&fsl_pq_mdio_driver); | |
493 | } | |
1577ecef | 494 | module_exit(fsl_pq_mdio_exit); |
26062897 | 495 | MODULE_LICENSE("GPL"); |