Loading...
1/*
2 * Freescale PowerQUICC Ethernet Driver -- MIIM bus implementation
3 * Provides Bus interface for MIIM regs
4 *
5 * Author: Andy Fleming <afleming@freescale.com>
6 * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>
7 *
8 * Copyright 2002-2004, 2008-2009 Freescale Semiconductor, Inc.
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/slab.h>
23#include <linux/delay.h>
24#include <linux/module.h>
25#include <linux/mii.h>
26#include <linux/of_address.h>
27#include <linux/of_mdio.h>
28#include <linux/of_device.h>
29
30#include <asm/io.h>
31#if IS_ENABLED(CONFIG_UCC_GETH)
32#include <soc/fsl/qe/ucc.h>
33#endif
34
35#include "gianfar.h"
36
37#define MIIMIND_BUSY 0x00000001
38#define MIIMIND_NOTVALID 0x00000004
39#define MIIMCFG_INIT_VALUE 0x00000007
40#define MIIMCFG_RESET 0x80000000
41
42#define MII_READ_COMMAND 0x00000001
43
44struct fsl_pq_mii {
45 u32 miimcfg; /* MII management configuration reg */
46 u32 miimcom; /* MII management command reg */
47 u32 miimadd; /* MII management address reg */
48 u32 miimcon; /* MII management control reg */
49 u32 miimstat; /* MII management status reg */
50 u32 miimind; /* MII management indication reg */
51};
52
53struct fsl_pq_mdio {
54 u8 res1[16];
55 u32 ieventm; /* MDIO Interrupt event register (for etsec2)*/
56 u32 imaskm; /* MDIO Interrupt mask register (for etsec2)*/
57 u8 res2[4];
58 u32 emapm; /* MDIO Event mapping register (for etsec2)*/
59 u8 res3[1280];
60 struct fsl_pq_mii mii;
61 u8 res4[28];
62 u32 utbipar; /* TBI phy address reg (only on UCC) */
63 u8 res5[2728];
64} __packed;
65
66/* Number of microseconds to wait for an MII register to respond */
67#define MII_TIMEOUT 1000
68
69struct fsl_pq_mdio_priv {
70 void __iomem *map;
71 struct fsl_pq_mii __iomem *regs;
72};
73
74/*
75 * Per-device-type data. Each type of device tree node that we support gets
76 * one of these.
77 *
78 * @mii_offset: the offset of the MII registers within the memory map of the
79 * node. Some nodes define only the MII registers, and some define the whole
80 * MAC (which includes the MII registers).
81 *
82 * @get_tbipa: determines the address of the TBIPA register
83 *
84 * @ucc_configure: a special function for extra QE configuration
85 */
86struct fsl_pq_mdio_data {
87 unsigned int mii_offset; /* offset of the MII registers */
88 uint32_t __iomem * (*get_tbipa)(void __iomem *p);
89 void (*ucc_configure)(phys_addr_t start, phys_addr_t end);
90};
91
92/*
93 * Write value to the PHY at mii_id at register regnum, on the bus attached
94 * to the local interface, which may be different from the generic mdio bus
95 * (tied to a single interface), waiting until the write is done before
96 * returning. This is helpful in programming interfaces like the TBI which
97 * control interfaces like onchip SERDES and are always tied to the local
98 * mdio pins, which may not be the same as system mdio bus, used for
99 * controlling the external PHYs, for example.
100 */
101static int fsl_pq_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
102 u16 value)
103{
104 struct fsl_pq_mdio_priv *priv = bus->priv;
105 struct fsl_pq_mii __iomem *regs = priv->regs;
106 unsigned int timeout;
107
108 /* Set the PHY address and the register address we want to write */
109 iowrite32be((mii_id << 8) | regnum, ®s->miimadd);
110
111 /* Write out the value we want */
112 iowrite32be(value, ®s->miimcon);
113
114 /* Wait for the transaction to finish */
115 timeout = MII_TIMEOUT;
116 while ((ioread32be(®s->miimind) & MIIMIND_BUSY) && timeout) {
117 cpu_relax();
118 timeout--;
119 }
120
121 return timeout ? 0 : -ETIMEDOUT;
122}
123
124/*
125 * Read the bus for PHY at addr mii_id, register regnum, and return the value.
126 * Clears miimcom first.
127 *
128 * All PHY operation done on the bus attached to the local interface, which
129 * may be different from the generic mdio bus. This is helpful in programming
130 * interfaces like the TBI which, in turn, control interfaces like on-chip
131 * SERDES and are always tied to the local mdio pins, which may not be the
132 * same as system mdio bus, used for controlling the external PHYs, for eg.
133 */
134static int fsl_pq_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
135{
136 struct fsl_pq_mdio_priv *priv = bus->priv;
137 struct fsl_pq_mii __iomem *regs = priv->regs;
138 unsigned int timeout;
139 u16 value;
140
141 /* Set the PHY address and the register address we want to read */
142 iowrite32be((mii_id << 8) | regnum, ®s->miimadd);
143
144 /* Clear miimcom, and then initiate a read */
145 iowrite32be(0, ®s->miimcom);
146 iowrite32be(MII_READ_COMMAND, ®s->miimcom);
147
148 /* Wait for the transaction to finish, normally less than 100us */
149 timeout = MII_TIMEOUT;
150 while ((ioread32be(®s->miimind) &
151 (MIIMIND_NOTVALID | MIIMIND_BUSY)) && timeout) {
152 cpu_relax();
153 timeout--;
154 }
155
156 if (!timeout)
157 return -ETIMEDOUT;
158
159 /* Grab the value of the register from miimstat */
160 value = ioread32be(®s->miimstat);
161
162 dev_dbg(&bus->dev, "read %04x from address %x/%x\n", value, mii_id, regnum);
163 return value;
164}
165
166/* Reset the MIIM registers, and wait for the bus to free */
167static int fsl_pq_mdio_reset(struct mii_bus *bus)
168{
169 struct fsl_pq_mdio_priv *priv = bus->priv;
170 struct fsl_pq_mii __iomem *regs = priv->regs;
171 unsigned int timeout;
172
173 mutex_lock(&bus->mdio_lock);
174
175 /* Reset the management interface */
176 iowrite32be(MIIMCFG_RESET, ®s->miimcfg);
177
178 /* Setup the MII Mgmt clock speed */
179 iowrite32be(MIIMCFG_INIT_VALUE, ®s->miimcfg);
180
181 /* Wait until the bus is free */
182 timeout = MII_TIMEOUT;
183 while ((ioread32be(®s->miimind) & MIIMIND_BUSY) && timeout) {
184 cpu_relax();
185 timeout--;
186 }
187
188 mutex_unlock(&bus->mdio_lock);
189
190 if (!timeout) {
191 dev_err(&bus->dev, "timeout waiting for MII bus\n");
192 return -EBUSY;
193 }
194
195 return 0;
196}
197
198#if IS_ENABLED(CONFIG_GIANFAR)
199/*
200 * Return the TBIPA address, starting from the address
201 * of the mapped GFAR MDIO registers (struct gfar)
202 * This is mildly evil, but so is our hardware for doing this.
203 * Also, we have to cast back to struct gfar because of
204 * definition weirdness done in gianfar.h.
205 */
206static uint32_t __iomem *get_gfar_tbipa_from_mdio(void __iomem *p)
207{
208 struct gfar __iomem *enet_regs = p;
209
210 return &enet_regs->tbipa;
211}
212
213/*
214 * Return the TBIPA address, starting from the address
215 * of the mapped GFAR MII registers (gfar_mii_regs[] within struct gfar)
216 */
217static uint32_t __iomem *get_gfar_tbipa_from_mii(void __iomem *p)
218{
219 return get_gfar_tbipa_from_mdio(container_of(p, struct gfar, gfar_mii_regs));
220}
221
222/*
223 * Return the TBIPAR address for an eTSEC2 node
224 */
225static uint32_t __iomem *get_etsec_tbipa(void __iomem *p)
226{
227 return p;
228}
229#endif
230
231#if IS_ENABLED(CONFIG_UCC_GETH)
232/*
233 * Return the TBIPAR address for a QE MDIO node, starting from the address
234 * of the mapped MII registers (struct fsl_pq_mii)
235 */
236static uint32_t __iomem *get_ucc_tbipa(void __iomem *p)
237{
238 struct fsl_pq_mdio __iomem *mdio = container_of(p, struct fsl_pq_mdio, mii);
239
240 return &mdio->utbipar;
241}
242
243/*
244 * Find the UCC node that controls the given MDIO node
245 *
246 * For some reason, the QE MDIO nodes are not children of the UCC devices
247 * that control them. Therefore, we need to scan all UCC nodes looking for
248 * the one that encompases the given MDIO node. We do this by comparing
249 * physical addresses. The 'start' and 'end' addresses of the MDIO node are
250 * passed, and the correct UCC node will cover the entire address range.
251 *
252 * This assumes that there is only one QE MDIO node in the entire device tree.
253 */
254static void ucc_configure(phys_addr_t start, phys_addr_t end)
255{
256 static bool found_mii_master;
257 struct device_node *np = NULL;
258
259 if (found_mii_master)
260 return;
261
262 for_each_compatible_node(np, NULL, "ucc_geth") {
263 struct resource res;
264 const uint32_t *iprop;
265 uint32_t id;
266 int ret;
267
268 ret = of_address_to_resource(np, 0, &res);
269 if (ret < 0) {
270 pr_debug("fsl-pq-mdio: no address range in node %pOF\n",
271 np);
272 continue;
273 }
274
275 /* if our mdio regs fall within this UCC regs range */
276 if ((start < res.start) || (end > res.end))
277 continue;
278
279 iprop = of_get_property(np, "cell-index", NULL);
280 if (!iprop) {
281 iprop = of_get_property(np, "device-id", NULL);
282 if (!iprop) {
283 pr_debug("fsl-pq-mdio: no UCC ID in node %pOF\n",
284 np);
285 continue;
286 }
287 }
288
289 id = be32_to_cpup(iprop);
290
291 /*
292 * cell-index and device-id for QE nodes are
293 * numbered from 1, not 0.
294 */
295 if (ucc_set_qe_mux_mii_mng(id - 1) < 0) {
296 pr_debug("fsl-pq-mdio: invalid UCC ID in node %pOF\n",
297 np);
298 continue;
299 }
300
301 pr_debug("fsl-pq-mdio: setting node UCC%u to MII master\n", id);
302 found_mii_master = true;
303 }
304}
305
306#endif
307
308static const struct of_device_id fsl_pq_mdio_match[] = {
309#if IS_ENABLED(CONFIG_GIANFAR)
310 {
311 .compatible = "fsl,gianfar-tbi",
312 .data = &(struct fsl_pq_mdio_data) {
313 .mii_offset = 0,
314 .get_tbipa = get_gfar_tbipa_from_mii,
315 },
316 },
317 {
318 .compatible = "fsl,gianfar-mdio",
319 .data = &(struct fsl_pq_mdio_data) {
320 .mii_offset = 0,
321 .get_tbipa = get_gfar_tbipa_from_mii,
322 },
323 },
324 {
325 .type = "mdio",
326 .compatible = "gianfar",
327 .data = &(struct fsl_pq_mdio_data) {
328 .mii_offset = offsetof(struct fsl_pq_mdio, mii),
329 .get_tbipa = get_gfar_tbipa_from_mdio,
330 },
331 },
332 {
333 .compatible = "fsl,etsec2-tbi",
334 .data = &(struct fsl_pq_mdio_data) {
335 .mii_offset = offsetof(struct fsl_pq_mdio, mii),
336 .get_tbipa = get_etsec_tbipa,
337 },
338 },
339 {
340 .compatible = "fsl,etsec2-mdio",
341 .data = &(struct fsl_pq_mdio_data) {
342 .mii_offset = offsetof(struct fsl_pq_mdio, mii),
343 .get_tbipa = get_etsec_tbipa,
344 },
345 },
346#endif
347#if IS_ENABLED(CONFIG_UCC_GETH)
348 {
349 .compatible = "fsl,ucc-mdio",
350 .data = &(struct fsl_pq_mdio_data) {
351 .mii_offset = 0,
352 .get_tbipa = get_ucc_tbipa,
353 .ucc_configure = ucc_configure,
354 },
355 },
356 {
357 /* Legacy UCC MDIO node */
358 .type = "mdio",
359 .compatible = "ucc_geth_phy",
360 .data = &(struct fsl_pq_mdio_data) {
361 .mii_offset = 0,
362 .get_tbipa = get_ucc_tbipa,
363 .ucc_configure = ucc_configure,
364 },
365 },
366#endif
367 /* No Kconfig option for Fman support yet */
368 {
369 .compatible = "fsl,fman-mdio",
370 .data = &(struct fsl_pq_mdio_data) {
371 .mii_offset = 0,
372 /* Fman TBI operations are handled elsewhere */
373 },
374 },
375
376 {},
377};
378MODULE_DEVICE_TABLE(of, fsl_pq_mdio_match);
379
380static void set_tbipa(const u32 tbipa_val, struct platform_device *pdev,
381 uint32_t __iomem * (*get_tbipa)(void __iomem *),
382 void __iomem *reg_map, struct resource *reg_res)
383{
384 struct device_node *np = pdev->dev.of_node;
385 uint32_t __iomem *tbipa;
386 bool tbipa_mapped;
387
388 tbipa = of_iomap(np, 1);
389 if (tbipa) {
390 tbipa_mapped = true;
391 } else {
392 tbipa_mapped = false;
393 tbipa = (*get_tbipa)(reg_map);
394
395 /*
396 * Add consistency check to make sure TBI is contained within
397 * the mapped range (not because we would get a segfault,
398 * rather to catch bugs in computing TBI address). Print error
399 * message but continue anyway.
400 */
401 if ((void *)tbipa > reg_map + resource_size(reg_res) - 4)
402 dev_err(&pdev->dev, "invalid register map (should be at least 0x%04zx to contain TBI address)\n",
403 ((void *)tbipa - reg_map) + 4);
404 }
405
406 iowrite32be(be32_to_cpu(tbipa_val), tbipa);
407
408 if (tbipa_mapped)
409 iounmap(tbipa);
410}
411
412static int fsl_pq_mdio_probe(struct platform_device *pdev)
413{
414 const struct of_device_id *id =
415 of_match_device(fsl_pq_mdio_match, &pdev->dev);
416 const struct fsl_pq_mdio_data *data;
417 struct device_node *np = pdev->dev.of_node;
418 struct resource res;
419 struct device_node *tbi;
420 struct fsl_pq_mdio_priv *priv;
421 struct mii_bus *new_bus;
422 int err;
423
424 if (!id) {
425 dev_err(&pdev->dev, "Failed to match device\n");
426 return -ENODEV;
427 }
428
429 data = id->data;
430
431 dev_dbg(&pdev->dev, "found %s compatible node\n", id->compatible);
432
433 new_bus = mdiobus_alloc_size(sizeof(*priv));
434 if (!new_bus)
435 return -ENOMEM;
436
437 priv = new_bus->priv;
438 new_bus->name = "Freescale PowerQUICC MII Bus",
439 new_bus->read = &fsl_pq_mdio_read;
440 new_bus->write = &fsl_pq_mdio_write;
441 new_bus->reset = &fsl_pq_mdio_reset;
442
443 err = of_address_to_resource(np, 0, &res);
444 if (err < 0) {
445 dev_err(&pdev->dev, "could not obtain address information\n");
446 goto error;
447 }
448
449 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%s@%llx", np->name,
450 (unsigned long long)res.start);
451
452 priv->map = of_iomap(np, 0);
453 if (!priv->map) {
454 err = -ENOMEM;
455 goto error;
456 }
457
458 /*
459 * Some device tree nodes represent only the MII registers, and
460 * others represent the MAC and MII registers. The 'mii_offset' field
461 * contains the offset of the MII registers inside the mapped register
462 * space.
463 */
464 if (data->mii_offset > resource_size(&res)) {
465 dev_err(&pdev->dev, "invalid register map\n");
466 err = -EINVAL;
467 goto error;
468 }
469 priv->regs = priv->map + data->mii_offset;
470
471 new_bus->parent = &pdev->dev;
472 platform_set_drvdata(pdev, new_bus);
473
474 if (data->get_tbipa) {
475 for_each_child_of_node(np, tbi) {
476 if (strcmp(tbi->type, "tbi-phy") == 0) {
477 dev_dbg(&pdev->dev, "found TBI PHY node %pOFP\n",
478 tbi);
479 break;
480 }
481 }
482
483 if (tbi) {
484 const u32 *prop = of_get_property(tbi, "reg", NULL);
485 if (!prop) {
486 dev_err(&pdev->dev,
487 "missing 'reg' property in node %pOF\n",
488 tbi);
489 err = -EBUSY;
490 goto error;
491 }
492 set_tbipa(*prop, pdev,
493 data->get_tbipa, priv->map, &res);
494 }
495 }
496
497 if (data->ucc_configure)
498 data->ucc_configure(res.start, res.end);
499
500 err = of_mdiobus_register(new_bus, np);
501 if (err) {
502 dev_err(&pdev->dev, "cannot register %s as MDIO bus\n",
503 new_bus->name);
504 goto error;
505 }
506
507 return 0;
508
509error:
510 if (priv->map)
511 iounmap(priv->map);
512
513 kfree(new_bus);
514
515 return err;
516}
517
518
519static int fsl_pq_mdio_remove(struct platform_device *pdev)
520{
521 struct device *device = &pdev->dev;
522 struct mii_bus *bus = dev_get_drvdata(device);
523 struct fsl_pq_mdio_priv *priv = bus->priv;
524
525 mdiobus_unregister(bus);
526
527 iounmap(priv->map);
528 mdiobus_free(bus);
529
530 return 0;
531}
532
533static struct platform_driver fsl_pq_mdio_driver = {
534 .driver = {
535 .name = "fsl-pq_mdio",
536 .of_match_table = fsl_pq_mdio_match,
537 },
538 .probe = fsl_pq_mdio_probe,
539 .remove = fsl_pq_mdio_remove,
540};
541
542module_platform_driver(fsl_pq_mdio_driver);
543
544MODULE_LICENSE("GPL");
1/*
2 * Freescale PowerQUICC Ethernet Driver -- MIIM bus implementation
3 * Provides Bus interface for MIIM regs
4 *
5 * Author: Andy Fleming <afleming@freescale.com>
6 * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>
7 *
8 * Copyright 2002-2004, 2008-2009 Freescale Semiconductor, Inc.
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>
38#include <linux/of_address.h>
39#include <linux/of_mdio.h>
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
50struct fsl_pq_mdio_priv {
51 void __iomem *map;
52 struct fsl_pq_mdio __iomem *regs;
53};
54
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 */
64int 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 */
90int 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
112static struct fsl_pq_mdio __iomem *fsl_pq_mdio_get_regs(struct mii_bus *bus)
113{
114 struct fsl_pq_mdio_priv *priv = bus->priv;
115
116 return priv->regs;
117}
118
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 */
123int fsl_pq_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value)
124{
125 struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
126
127 /* Write to the local MII regs */
128 return fsl_pq_local_mdio_write(regs, mii_id, regnum, value);
129}
130
131/*
132 * Read the bus for PHY at addr mii_id, register regnum, and
133 * return the value. Clears miimcom first.
134 */
135int fsl_pq_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
136{
137 struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
138
139 /* Read the local MII regs */
140 return fsl_pq_local_mdio_read(regs, mii_id, regnum);
141}
142
143/* Reset the MIIM registers, and wait for the bus to free */
144static int fsl_pq_mdio_reset(struct mii_bus *bus)
145{
146 struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
147 int timeout = PHY_INIT_TIMEOUT;
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
163 if (timeout < 0) {
164 printk(KERN_ERR "%s: The MII Bus is stuck!\n",
165 bus->name);
166 return -EBUSY;
167 }
168
169 return 0;
170}
171
172void fsl_pq_mdio_bus_name(char *name, struct device_node *np)
173{
174 const u32 *addr;
175 u64 taddr = OF_BAD_ADDR;
176
177 addr = of_get_address(np, 0, NULL, NULL);
178 if (addr)
179 taddr = of_translate_address(np, addr);
180
181 snprintf(name, MII_BUS_ID_SIZE, "%s@%llx", np->name,
182 (unsigned long long)taddr);
183}
184EXPORT_SYMBOL_GPL(fsl_pq_mdio_bus_name);
185
186
187static u32 __iomem *get_gfar_tbipa(struct fsl_pq_mdio __iomem *regs, struct device_node *np)
188{
189#if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE)
190 struct gfar __iomem *enet_regs;
191
192 /*
193 * This is mildly evil, but so is our hardware for doing this.
194 * Also, we have to cast back to struct gfar because of
195 * definition weirdness done in gianfar.h.
196 */
197 if(of_device_is_compatible(np, "fsl,gianfar-mdio") ||
198 of_device_is_compatible(np, "fsl,gianfar-tbi") ||
199 of_device_is_compatible(np, "gianfar")) {
200 enet_regs = (struct gfar __iomem *)regs;
201 return &enet_regs->tbipa;
202 } else if (of_device_is_compatible(np, "fsl,etsec2-mdio") ||
203 of_device_is_compatible(np, "fsl,etsec2-tbi")) {
204 return of_iomap(np, 1);
205 }
206#endif
207 return NULL;
208}
209
210
211static int get_ucc_id_for_range(u64 start, u64 end, u32 *ucc_id)
212{
213#if defined(CONFIG_UCC_GETH) || defined(CONFIG_UCC_GETH_MODULE)
214 struct device_node *np = NULL;
215 int err = 0;
216
217 for_each_compatible_node(np, NULL, "ucc_geth") {
218 struct resource tempres;
219
220 err = of_address_to_resource(np, 0, &tempres);
221 if (err)
222 continue;
223
224 /* if our mdio regs fall within this UCC regs range */
225 if ((start >= tempres.start) && (end <= tempres.end)) {
226 /* Find the id of the UCC */
227 const u32 *id;
228
229 id = of_get_property(np, "cell-index", NULL);
230 if (!id) {
231 id = of_get_property(np, "device-id", NULL);
232 if (!id)
233 continue;
234 }
235
236 *ucc_id = *id;
237
238 return 0;
239 }
240 }
241
242 if (err)
243 return err;
244 else
245 return -EINVAL;
246#else
247 return -ENODEV;
248#endif
249}
250
251static int fsl_pq_mdio_probe(struct platform_device *ofdev)
252{
253 struct device_node *np = ofdev->dev.of_node;
254 struct device_node *tbi;
255 struct fsl_pq_mdio_priv *priv;
256 struct fsl_pq_mdio __iomem *regs = NULL;
257 void __iomem *map;
258 u32 __iomem *tbipa;
259 struct mii_bus *new_bus;
260 int tbiaddr = -1;
261 const u32 *addrp;
262 u64 addr = 0, size = 0;
263 int err;
264
265 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
266 if (!priv)
267 return -ENOMEM;
268
269 new_bus = mdiobus_alloc();
270 if (!new_bus) {
271 err = -ENOMEM;
272 goto err_free_priv;
273 }
274
275 new_bus->name = "Freescale PowerQUICC MII Bus",
276 new_bus->read = &fsl_pq_mdio_read,
277 new_bus->write = &fsl_pq_mdio_write,
278 new_bus->reset = &fsl_pq_mdio_reset,
279 new_bus->priv = priv;
280 fsl_pq_mdio_bus_name(new_bus->id, np);
281
282 addrp = of_get_address(np, 0, &size, NULL);
283 if (!addrp) {
284 err = -EINVAL;
285 goto err_free_bus;
286 }
287
288 /* Set the PHY base address */
289 addr = of_translate_address(np, addrp);
290 if (addr == OF_BAD_ADDR) {
291 err = -EINVAL;
292 goto err_free_bus;
293 }
294
295 map = ioremap(addr, size);
296 if (!map) {
297 err = -ENOMEM;
298 goto err_free_bus;
299 }
300 priv->map = map;
301
302 if (of_device_is_compatible(np, "fsl,gianfar-mdio") ||
303 of_device_is_compatible(np, "fsl,gianfar-tbi") ||
304 of_device_is_compatible(np, "fsl,ucc-mdio") ||
305 of_device_is_compatible(np, "ucc_geth_phy"))
306 map -= offsetof(struct fsl_pq_mdio, miimcfg);
307 regs = map;
308 priv->regs = regs;
309
310 new_bus->irq = kcalloc(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL);
311
312 if (NULL == new_bus->irq) {
313 err = -ENOMEM;
314 goto err_unmap_regs;
315 }
316
317 new_bus->parent = &ofdev->dev;
318 dev_set_drvdata(&ofdev->dev, new_bus);
319
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,etsec2-mdio") ||
323 of_device_is_compatible(np, "fsl,etsec2-tbi") ||
324 of_device_is_compatible(np, "gianfar")) {
325 tbipa = get_gfar_tbipa(regs, np);
326 if (!tbipa) {
327 err = -EINVAL;
328 goto err_free_irqs;
329 }
330 } else if (of_device_is_compatible(np, "fsl,ucc-mdio") ||
331 of_device_is_compatible(np, "ucc_geth_phy")) {
332 u32 id;
333 static u32 mii_mng_master;
334
335 tbipa = ®s->utbipar;
336
337 if ((err = get_ucc_id_for_range(addr, addr + size, &id)))
338 goto err_free_irqs;
339
340 if (!mii_mng_master) {
341 mii_mng_master = id;
342 ucc_set_qe_mux_mii_mng(id - 1);
343 }
344 } else {
345 err = -ENODEV;
346 goto err_free_irqs;
347 }
348
349 for_each_child_of_node(np, tbi) {
350 if (!strncmp(tbi->type, "tbi-phy", 8))
351 break;
352 }
353
354 if (tbi) {
355 const u32 *prop = of_get_property(tbi, "reg", NULL);
356
357 if (prop)
358 tbiaddr = *prop;
359
360 if (tbiaddr == -1) {
361 err = -EBUSY;
362 goto err_free_irqs;
363 } else {
364 out_be32(tbipa, tbiaddr);
365 }
366 }
367
368 err = of_mdiobus_register(new_bus, np);
369 if (err) {
370 printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
371 new_bus->name);
372 goto err_free_irqs;
373 }
374
375 return 0;
376
377err_free_irqs:
378 kfree(new_bus->irq);
379err_unmap_regs:
380 iounmap(priv->map);
381err_free_bus:
382 kfree(new_bus);
383err_free_priv:
384 kfree(priv);
385 return err;
386}
387
388
389static int fsl_pq_mdio_remove(struct platform_device *ofdev)
390{
391 struct device *device = &ofdev->dev;
392 struct mii_bus *bus = dev_get_drvdata(device);
393 struct fsl_pq_mdio_priv *priv = bus->priv;
394
395 mdiobus_unregister(bus);
396
397 dev_set_drvdata(device, NULL);
398
399 iounmap(priv->map);
400 bus->priv = NULL;
401 mdiobus_free(bus);
402 kfree(priv);
403
404 return 0;
405}
406
407static struct of_device_id fsl_pq_mdio_match[] = {
408 {
409 .type = "mdio",
410 .compatible = "ucc_geth_phy",
411 },
412 {
413 .type = "mdio",
414 .compatible = "gianfar",
415 },
416 {
417 .compatible = "fsl,ucc-mdio",
418 },
419 {
420 .compatible = "fsl,gianfar-tbi",
421 },
422 {
423 .compatible = "fsl,gianfar-mdio",
424 },
425 {
426 .compatible = "fsl,etsec2-tbi",
427 },
428 {
429 .compatible = "fsl,etsec2-mdio",
430 },
431 {},
432};
433MODULE_DEVICE_TABLE(of, fsl_pq_mdio_match);
434
435static struct platform_driver fsl_pq_mdio_driver = {
436 .driver = {
437 .name = "fsl-pq_mdio",
438 .owner = THIS_MODULE,
439 .of_match_table = fsl_pq_mdio_match,
440 },
441 .probe = fsl_pq_mdio_probe,
442 .remove = fsl_pq_mdio_remove,
443};
444
445module_platform_driver(fsl_pq_mdio_driver);
446
447MODULE_LICENSE("GPL");