Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * B53 register access through memory mapped registers
3 *
4 * Copyright (C) 2012-2013 Jonas Gorski <jogo@openwrt.org>
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <linux/bits.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/of.h>
23#include <linux/io.h>
24#include <linux/mfd/syscon.h>
25#include <linux/platform_device.h>
26#include <linux/platform_data/b53.h>
27#include <linux/regmap.h>
28
29#include "b53_priv.h"
30
31#define BCM63XX_EPHY_REG 0x3C
32#define BCM63268_GPHY_REG 0x54
33
34#define GPHY_CTRL_LOW_PWR BIT(3)
35#define GPHY_CTRL_IDDQ_BIAS BIT(0)
36
37struct b53_phy_info {
38 u32 gphy_port_mask;
39 u32 ephy_enable_mask;
40 u32 ephy_port_mask;
41 u32 ephy_bias_bit;
42 const u32 *ephy_offset;
43};
44
45struct b53_mmap_priv {
46 void __iomem *regs;
47 struct regmap *gpio_ctrl;
48 const struct b53_phy_info *phy_info;
49 u32 phys_enabled;
50};
51
52static const u32 bcm6318_ephy_offsets[] = {4, 5, 6, 7};
53
54static const struct b53_phy_info bcm6318_ephy_info = {
55 .ephy_enable_mask = BIT(0) | BIT(4) | BIT(8) | BIT(12) | BIT(16),
56 .ephy_port_mask = GENMASK((ARRAY_SIZE(bcm6318_ephy_offsets) - 1), 0),
57 .ephy_bias_bit = 24,
58 .ephy_offset = bcm6318_ephy_offsets,
59};
60
61static const u32 bcm6368_ephy_offsets[] = {2, 3, 4, 5};
62
63static const struct b53_phy_info bcm6368_ephy_info = {
64 .ephy_enable_mask = BIT(0),
65 .ephy_port_mask = GENMASK((ARRAY_SIZE(bcm6368_ephy_offsets) - 1), 0),
66 .ephy_bias_bit = 0,
67 .ephy_offset = bcm6368_ephy_offsets,
68};
69
70static const u32 bcm63268_ephy_offsets[] = {4, 9, 14};
71
72static const struct b53_phy_info bcm63268_ephy_info = {
73 .gphy_port_mask = BIT(3),
74 .ephy_enable_mask = GENMASK(4, 0),
75 .ephy_port_mask = GENMASK((ARRAY_SIZE(bcm63268_ephy_offsets) - 1), 0),
76 .ephy_bias_bit = 24,
77 .ephy_offset = bcm63268_ephy_offsets,
78};
79
80static int b53_mmap_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val)
81{
82 struct b53_mmap_priv *priv = dev->priv;
83 void __iomem *regs = priv->regs;
84
85 *val = readb(regs + (page << 8) + reg);
86
87 return 0;
88}
89
90static int b53_mmap_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val)
91{
92 struct b53_mmap_priv *priv = dev->priv;
93 void __iomem *regs = priv->regs;
94
95 if (WARN_ON(reg % 2))
96 return -EINVAL;
97
98 if (dev->pdata && dev->pdata->big_endian)
99 *val = ioread16be(regs + (page << 8) + reg);
100 else
101 *val = readw(regs + (page << 8) + reg);
102
103 return 0;
104}
105
106static int b53_mmap_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val)
107{
108 struct b53_mmap_priv *priv = dev->priv;
109 void __iomem *regs = priv->regs;
110
111 if (WARN_ON(reg % 4))
112 return -EINVAL;
113
114 if (dev->pdata && dev->pdata->big_endian)
115 *val = ioread32be(regs + (page << 8) + reg);
116 else
117 *val = readl(regs + (page << 8) + reg);
118
119 return 0;
120}
121
122static int b53_mmap_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val)
123{
124 struct b53_mmap_priv *priv = dev->priv;
125 void __iomem *regs = priv->regs;
126
127 if (WARN_ON(reg % 2))
128 return -EINVAL;
129
130 if (reg % 4) {
131 u16 lo;
132 u32 hi;
133
134 if (dev->pdata && dev->pdata->big_endian) {
135 lo = ioread16be(regs + (page << 8) + reg);
136 hi = ioread32be(regs + (page << 8) + reg + 2);
137 } else {
138 lo = readw(regs + (page << 8) + reg);
139 hi = readl(regs + (page << 8) + reg + 2);
140 }
141
142 *val = ((u64)hi << 16) | lo;
143 } else {
144 u32 lo;
145 u16 hi;
146
147 if (dev->pdata && dev->pdata->big_endian) {
148 lo = ioread32be(regs + (page << 8) + reg);
149 hi = ioread16be(regs + (page << 8) + reg + 4);
150 } else {
151 lo = readl(regs + (page << 8) + reg);
152 hi = readw(regs + (page << 8) + reg + 4);
153 }
154
155 *val = ((u64)hi << 32) | lo;
156 }
157
158 return 0;
159}
160
161static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val)
162{
163 struct b53_mmap_priv *priv = dev->priv;
164 void __iomem *regs = priv->regs;
165 u32 hi, lo;
166
167 if (WARN_ON(reg % 4))
168 return -EINVAL;
169
170 if (dev->pdata && dev->pdata->big_endian) {
171 lo = ioread32be(regs + (page << 8) + reg);
172 hi = ioread32be(regs + (page << 8) + reg + 4);
173 } else {
174 lo = readl(regs + (page << 8) + reg);
175 hi = readl(regs + (page << 8) + reg + 4);
176 }
177
178 *val = ((u64)hi << 32) | lo;
179
180 return 0;
181}
182
183static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value)
184{
185 struct b53_mmap_priv *priv = dev->priv;
186 void __iomem *regs = priv->regs;
187
188 writeb(value, regs + (page << 8) + reg);
189
190 return 0;
191}
192
193static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg,
194 u16 value)
195{
196 struct b53_mmap_priv *priv = dev->priv;
197 void __iomem *regs = priv->regs;
198
199 if (WARN_ON(reg % 2))
200 return -EINVAL;
201
202 if (dev->pdata && dev->pdata->big_endian)
203 iowrite16be(value, regs + (page << 8) + reg);
204 else
205 writew(value, regs + (page << 8) + reg);
206
207 return 0;
208}
209
210static int b53_mmap_write32(struct b53_device *dev, u8 page, u8 reg,
211 u32 value)
212{
213 struct b53_mmap_priv *priv = dev->priv;
214 void __iomem *regs = priv->regs;
215
216 if (WARN_ON(reg % 4))
217 return -EINVAL;
218
219 if (dev->pdata && dev->pdata->big_endian)
220 iowrite32be(value, regs + (page << 8) + reg);
221 else
222 writel(value, regs + (page << 8) + reg);
223
224 return 0;
225}
226
227static int b53_mmap_write48(struct b53_device *dev, u8 page, u8 reg,
228 u64 value)
229{
230 if (WARN_ON(reg % 2))
231 return -EINVAL;
232
233 if (reg % 4) {
234 u32 hi = (u32)(value >> 16);
235 u16 lo = (u16)value;
236
237 b53_mmap_write16(dev, page, reg, lo);
238 b53_mmap_write32(dev, page, reg + 2, hi);
239 } else {
240 u16 hi = (u16)(value >> 32);
241 u32 lo = (u32)value;
242
243 b53_mmap_write32(dev, page, reg, lo);
244 b53_mmap_write16(dev, page, reg + 4, hi);
245 }
246
247 return 0;
248}
249
250static int b53_mmap_write64(struct b53_device *dev, u8 page, u8 reg,
251 u64 value)
252{
253 u32 hi, lo;
254
255 hi = upper_32_bits(value);
256 lo = lower_32_bits(value);
257
258 if (WARN_ON(reg % 4))
259 return -EINVAL;
260
261 b53_mmap_write32(dev, page, reg, lo);
262 b53_mmap_write32(dev, page, reg + 4, hi);
263
264 return 0;
265}
266
267static int b53_mmap_phy_read16(struct b53_device *dev, int addr, int reg,
268 u16 *value)
269{
270 return -EIO;
271}
272
273static int b53_mmap_phy_write16(struct b53_device *dev, int addr, int reg,
274 u16 value)
275{
276 return -EIO;
277}
278
279static int bcm63xx_ephy_set(struct b53_device *dev, int port, bool enable)
280{
281 struct b53_mmap_priv *priv = dev->priv;
282 const struct b53_phy_info *info = priv->phy_info;
283 struct regmap *gpio_ctrl = priv->gpio_ctrl;
284 u32 mask, val;
285
286 if (enable) {
287 mask = (info->ephy_enable_mask << info->ephy_offset[port])
288 | BIT(info->ephy_bias_bit);
289 val = 0;
290 } else {
291 mask = (info->ephy_enable_mask << info->ephy_offset[port]);
292 if (!((priv->phys_enabled & ~BIT(port)) & info->ephy_port_mask))
293 mask |= BIT(info->ephy_bias_bit);
294 val = mask;
295 }
296 return regmap_update_bits(gpio_ctrl, BCM63XX_EPHY_REG, mask, val);
297}
298
299static int bcm63268_gphy_set(struct b53_device *dev, bool enable)
300{
301 struct b53_mmap_priv *priv = dev->priv;
302 struct regmap *gpio_ctrl = priv->gpio_ctrl;
303 u32 mask = GPHY_CTRL_IDDQ_BIAS | GPHY_CTRL_LOW_PWR;
304 u32 val = 0;
305
306 if (!enable)
307 val = mask;
308
309 return regmap_update_bits(gpio_ctrl, BCM63268_GPHY_REG, mask, val);
310}
311
312static void b53_mmap_phy_enable(struct b53_device *dev, int port)
313{
314 struct b53_mmap_priv *priv = dev->priv;
315 int ret = 0;
316
317 if (priv->phy_info) {
318 if (BIT(port) & priv->phy_info->ephy_port_mask)
319 ret = bcm63xx_ephy_set(dev, port, true);
320 else if (BIT(port) & priv->phy_info->gphy_port_mask)
321 ret = bcm63268_gphy_set(dev, true);
322 }
323
324 if (!ret)
325 priv->phys_enabled |= BIT(port);
326}
327
328static void b53_mmap_phy_disable(struct b53_device *dev, int port)
329{
330 struct b53_mmap_priv *priv = dev->priv;
331 int ret = 0;
332
333 if (priv->phy_info) {
334 if (BIT(port) & priv->phy_info->ephy_port_mask)
335 ret = bcm63xx_ephy_set(dev, port, false);
336 else if (BIT(port) & priv->phy_info->gphy_port_mask)
337 ret = bcm63268_gphy_set(dev, false);
338 }
339
340 if (!ret)
341 priv->phys_enabled &= ~BIT(port);
342}
343
344static const struct b53_io_ops b53_mmap_ops = {
345 .read8 = b53_mmap_read8,
346 .read16 = b53_mmap_read16,
347 .read32 = b53_mmap_read32,
348 .read48 = b53_mmap_read48,
349 .read64 = b53_mmap_read64,
350 .write8 = b53_mmap_write8,
351 .write16 = b53_mmap_write16,
352 .write32 = b53_mmap_write32,
353 .write48 = b53_mmap_write48,
354 .write64 = b53_mmap_write64,
355 .phy_read16 = b53_mmap_phy_read16,
356 .phy_write16 = b53_mmap_phy_write16,
357 .phy_enable = b53_mmap_phy_enable,
358 .phy_disable = b53_mmap_phy_disable,
359};
360
361static int b53_mmap_probe_of(struct platform_device *pdev,
362 struct b53_platform_data **ppdata)
363{
364 struct device_node *np = pdev->dev.of_node;
365 struct device_node *of_ports, *of_port;
366 struct device *dev = &pdev->dev;
367 struct b53_platform_data *pdata;
368 void __iomem *mem;
369
370 mem = devm_platform_ioremap_resource(pdev, 0);
371 if (IS_ERR(mem))
372 return PTR_ERR(mem);
373
374 pdata = devm_kzalloc(dev, sizeof(struct b53_platform_data),
375 GFP_KERNEL);
376 if (!pdata)
377 return -ENOMEM;
378
379 pdata->regs = mem;
380 pdata->chip_id = (u32)(unsigned long)device_get_match_data(dev);
381 pdata->big_endian = of_property_read_bool(np, "big-endian");
382
383 of_ports = of_get_child_by_name(np, "ports");
384 if (!of_ports) {
385 dev_err(dev, "no ports child node found\n");
386 return -EINVAL;
387 }
388
389 for_each_available_child_of_node(of_ports, of_port) {
390 u32 reg;
391
392 if (of_property_read_u32(of_port, "reg", ®))
393 continue;
394
395 if (reg < B53_N_PORTS)
396 pdata->enabled_ports |= BIT(reg);
397 }
398
399 of_node_put(of_ports);
400 *ppdata = pdata;
401
402 return 0;
403}
404
405static int b53_mmap_probe(struct platform_device *pdev)
406{
407 struct device_node *np = pdev->dev.of_node;
408 struct b53_platform_data *pdata = pdev->dev.platform_data;
409 struct b53_mmap_priv *priv;
410 struct b53_device *dev;
411 int ret;
412
413 if (!pdata && np) {
414 ret = b53_mmap_probe_of(pdev, &pdata);
415 if (ret) {
416 dev_err(&pdev->dev, "OF probe error\n");
417 return ret;
418 }
419 }
420
421 if (!pdata)
422 return -EINVAL;
423
424 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
425 if (!priv)
426 return -ENOMEM;
427
428 priv->regs = pdata->regs;
429
430 priv->gpio_ctrl = syscon_regmap_lookup_by_phandle(np, "brcm,gpio-ctrl");
431 if (!IS_ERR(priv->gpio_ctrl)) {
432 if (pdata->chip_id == BCM6318_DEVICE_ID ||
433 pdata->chip_id == BCM6328_DEVICE_ID ||
434 pdata->chip_id == BCM6362_DEVICE_ID)
435 priv->phy_info = &bcm6318_ephy_info;
436 else if (pdata->chip_id == BCM6368_DEVICE_ID)
437 priv->phy_info = &bcm6368_ephy_info;
438 else if (pdata->chip_id == BCM63268_DEVICE_ID)
439 priv->phy_info = &bcm63268_ephy_info;
440 }
441
442 dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, priv);
443 if (!dev)
444 return -ENOMEM;
445
446 dev->pdata = pdata;
447
448 platform_set_drvdata(pdev, dev);
449
450 return b53_switch_register(dev);
451}
452
453static void b53_mmap_remove(struct platform_device *pdev)
454{
455 struct b53_device *dev = platform_get_drvdata(pdev);
456
457 if (dev)
458 b53_switch_remove(dev);
459}
460
461static void b53_mmap_shutdown(struct platform_device *pdev)
462{
463 struct b53_device *dev = platform_get_drvdata(pdev);
464
465 if (dev)
466 b53_switch_shutdown(dev);
467
468 platform_set_drvdata(pdev, NULL);
469}
470
471static const struct of_device_id b53_mmap_of_table[] = {
472 {
473 .compatible = "brcm,bcm3384-switch",
474 .data = (void *)BCM63XX_DEVICE_ID,
475 }, {
476 .compatible = "brcm,bcm6318-switch",
477 .data = (void *)BCM6318_DEVICE_ID,
478 }, {
479 .compatible = "brcm,bcm6328-switch",
480 .data = (void *)BCM6328_DEVICE_ID,
481 }, {
482 .compatible = "brcm,bcm6362-switch",
483 .data = (void *)BCM6362_DEVICE_ID,
484 }, {
485 .compatible = "brcm,bcm6368-switch",
486 .data = (void *)BCM6368_DEVICE_ID,
487 }, {
488 .compatible = "brcm,bcm63268-switch",
489 .data = (void *)BCM63268_DEVICE_ID,
490 }, {
491 .compatible = "brcm,bcm63xx-switch",
492 .data = (void *)BCM63XX_DEVICE_ID,
493 }, { /* sentinel */ }
494};
495MODULE_DEVICE_TABLE(of, b53_mmap_of_table);
496
497static struct platform_driver b53_mmap_driver = {
498 .probe = b53_mmap_probe,
499 .remove = b53_mmap_remove,
500 .shutdown = b53_mmap_shutdown,
501 .driver = {
502 .name = "b53-switch",
503 .of_match_table = b53_mmap_of_table,
504 },
505};
506
507module_platform_driver(b53_mmap_driver);
508MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
509MODULE_DESCRIPTION("B53 MMAP access driver");
510MODULE_LICENSE("Dual BSD/GPL");