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Commit | Line | Data |
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6a099c63 DK |
1 | /* |
2 | * Driver for SMSC USB3503 USB 2.0 hub controller driver | |
3 | * | |
4 | * Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
657d898a | 21 | #include <linux/clk.h> |
6a099c63 DK |
22 | #include <linux/i2c.h> |
23 | #include <linux/gpio.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/module.h> | |
eab8050c | 27 | #include <linux/of_gpio.h> |
6a099c63 DK |
28 | #include <linux/platform_device.h> |
29 | #include <linux/platform_data/usb3503.h> | |
68b14134 | 30 | #include <linux/regmap.h> |
6a099c63 DK |
31 | |
32 | #define USB3503_VIDL 0x00 | |
33 | #define USB3503_VIDM 0x01 | |
34 | #define USB3503_PIDL 0x02 | |
35 | #define USB3503_PIDM 0x03 | |
36 | #define USB3503_DIDL 0x04 | |
37 | #define USB3503_DIDM 0x05 | |
38 | ||
39 | #define USB3503_CFG1 0x06 | |
40 | #define USB3503_SELF_BUS_PWR (1 << 7) | |
41 | ||
42 | #define USB3503_CFG2 0x07 | |
43 | #define USB3503_CFG3 0x08 | |
44 | #define USB3503_NRD 0x09 | |
45 | ||
46 | #define USB3503_PDS 0x0a | |
6a099c63 DK |
47 | |
48 | #define USB3503_SP_ILOCK 0xe7 | |
49 | #define USB3503_SPILOCK_CONNECT (1 << 1) | |
50 | #define USB3503_SPILOCK_CONFIG (1 << 0) | |
51 | ||
52 | #define USB3503_CFGP 0xee | |
53 | #define USB3503_CLKSUSP (1 << 7) | |
54 | ||
68b14134 MB |
55 | #define USB3503_RESET 0xff |
56 | ||
6a099c63 DK |
57 | struct usb3503 { |
58 | enum usb3503_mode mode; | |
68b14134 MB |
59 | struct regmap *regmap; |
60 | struct device *dev; | |
657d898a | 61 | struct clk *clk; |
e8e44a48 | 62 | u8 port_off_mask; |
6a099c63 DK |
63 | int gpio_intn; |
64 | int gpio_reset; | |
65 | int gpio_connect; | |
657d898a | 66 | bool secondary_ref_clk; |
6a099c63 DK |
67 | }; |
68 | ||
8e7245b8 | 69 | static int usb3503_reset(struct usb3503 *hub, int state) |
6a099c63 | 70 | { |
8e7245b8 MB |
71 | if (!state && gpio_is_valid(hub->gpio_connect)) |
72 | gpio_set_value_cansleep(hub->gpio_connect, 0); | |
73 | ||
74 | if (gpio_is_valid(hub->gpio_reset)) | |
75 | gpio_set_value_cansleep(hub->gpio_reset, state); | |
6a099c63 | 76 | |
06a962fa | 77 | /* Wait T_HUBINIT == 4ms for hub logic to stabilize */ |
6a099c63 | 78 | if (state) |
06a962fa | 79 | usleep_range(4000, 10000); |
6a099c63 DK |
80 | |
81 | return 0; | |
82 | } | |
83 | ||
3f0d1c67 | 84 | static int usb3503_connect(struct usb3503 *hub) |
6a099c63 | 85 | { |
68b14134 | 86 | struct device *dev = hub->dev; |
3f0d1c67 | 87 | int err; |
6a099c63 | 88 | |
3f0d1c67 | 89 | usb3503_reset(hub, 1); |
6a099c63 | 90 | |
3f0d1c67 | 91 | if (hub->regmap) { |
6a099c63 | 92 | /* SP_ILOCK: set connect_n, config_n for config */ |
68b14134 | 93 | err = regmap_write(hub->regmap, USB3503_SP_ILOCK, |
3f0d1c67 | 94 | (USB3503_SPILOCK_CONNECT |
6a099c63 DK |
95 | | USB3503_SPILOCK_CONFIG)); |
96 | if (err < 0) { | |
68b14134 | 97 | dev_err(dev, "SP_ILOCK failed (%d)\n", err); |
3f0d1c67 | 98 | return err; |
6a099c63 DK |
99 | } |
100 | ||
e8e44a48 DK |
101 | /* PDS : Disable For Self Powered Operation */ |
102 | if (hub->port_off_mask) { | |
68b14134 MB |
103 | err = regmap_update_bits(hub->regmap, USB3503_PDS, |
104 | hub->port_off_mask, | |
e8e44a48 DK |
105 | hub->port_off_mask); |
106 | if (err < 0) { | |
68b14134 | 107 | dev_err(dev, "PDS failed (%d)\n", err); |
3f0d1c67 | 108 | return err; |
e8e44a48 | 109 | } |
6a099c63 DK |
110 | } |
111 | ||
112 | /* CFG1 : SELF_BUS_PWR -> Self-Powerd operation */ | |
68b14134 MB |
113 | err = regmap_update_bits(hub->regmap, USB3503_CFG1, |
114 | USB3503_SELF_BUS_PWR, | |
115 | USB3503_SELF_BUS_PWR); | |
6a099c63 | 116 | if (err < 0) { |
68b14134 | 117 | dev_err(dev, "CFG1 failed (%d)\n", err); |
3f0d1c67 | 118 | return err; |
6a099c63 DK |
119 | } |
120 | ||
121 | /* SP_LOCK: clear connect_n, config_n for hub connect */ | |
68b14134 MB |
122 | err = regmap_update_bits(hub->regmap, USB3503_SP_ILOCK, |
123 | (USB3503_SPILOCK_CONNECT | |
124 | | USB3503_SPILOCK_CONFIG), 0); | |
6a099c63 | 125 | if (err < 0) { |
68b14134 | 126 | dev_err(dev, "SP_ILOCK failed (%d)\n", err); |
3f0d1c67 | 127 | return err; |
6a099c63 | 128 | } |
3f0d1c67 | 129 | } |
6a099c63 | 130 | |
3f0d1c67 MB |
131 | if (gpio_is_valid(hub->gpio_connect)) |
132 | gpio_set_value_cansleep(hub->gpio_connect, 1); | |
8e7245b8 | 133 | |
3f0d1c67 MB |
134 | hub->mode = USB3503_MODE_HUB; |
135 | dev_info(dev, "switched to HUB mode\n"); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode) | |
141 | { | |
142 | struct device *dev = hub->dev; | |
143 | int err = 0; | |
144 | ||
145 | switch (mode) { | |
146 | case USB3503_MODE_HUB: | |
147 | err = usb3503_connect(hub); | |
6a099c63 DK |
148 | break; |
149 | ||
150 | case USB3503_MODE_STANDBY: | |
8e7245b8 | 151 | usb3503_reset(hub, 0); |
68b14134 | 152 | dev_info(dev, "switched to STANDBY mode\n"); |
6a099c63 DK |
153 | break; |
154 | ||
155 | default: | |
dd8e670d | 156 | dev_err(dev, "unknown mode is requested\n"); |
6a099c63 DK |
157 | err = -EINVAL; |
158 | break; | |
159 | } | |
160 | ||
6a099c63 DK |
161 | return err; |
162 | } | |
163 | ||
68b14134 MB |
164 | static const struct regmap_config usb3503_regmap_config = { |
165 | .reg_bits = 8, | |
166 | .val_bits = 8, | |
167 | ||
168 | .max_register = USB3503_RESET, | |
169 | }; | |
170 | ||
2487e3ee | 171 | static int usb3503_probe(struct usb3503 *hub) |
6a099c63 | 172 | { |
2487e3ee MB |
173 | struct device *dev = hub->dev; |
174 | struct usb3503_platform_data *pdata = dev_get_platdata(dev); | |
175 | struct device_node *np = dev->of_node; | |
176 | int err; | |
e5a0c874 | 177 | u32 mode = USB3503_MODE_HUB; |
e8b58b49 DK |
178 | const u32 *property; |
179 | int len; | |
6a099c63 | 180 | |
eab8050c | 181 | if (pdata) { |
e8e44a48 | 182 | hub->port_off_mask = pdata->port_off_mask; |
6a099c63 DK |
183 | hub->gpio_intn = pdata->gpio_intn; |
184 | hub->gpio_connect = pdata->gpio_connect; | |
185 | hub->gpio_reset = pdata->gpio_reset; | |
186 | hub->mode = pdata->initial_mode; | |
eab8050c | 187 | } else if (np) { |
657d898a | 188 | struct clk *clk; |
e8b58b49 DK |
189 | hub->port_off_mask = 0; |
190 | ||
657d898a MS |
191 | clk = devm_clk_get(dev, "refclk"); |
192 | if (IS_ERR(clk) && PTR_ERR(clk) != -ENOENT) { | |
ec5734c4 TB |
193 | dev_err(dev, "unable to request refclk (%ld)\n", |
194 | PTR_ERR(clk)); | |
657d898a MS |
195 | return PTR_ERR(clk); |
196 | } | |
197 | ||
198 | if (!IS_ERR(clk)) { | |
199 | u32 rate = 0; | |
200 | hub->clk = clk; | |
201 | ||
202 | if (!of_property_read_u32(np, "refclk-frequency", | |
203 | &rate)) { | |
204 | ||
205 | switch (rate) { | |
206 | case 38400000: | |
207 | case 26000000: | |
208 | case 19200000: | |
209 | case 12000000: | |
210 | hub->secondary_ref_clk = 0; | |
211 | break; | |
212 | case 24000000: | |
213 | case 27000000: | |
214 | case 25000000: | |
215 | case 50000000: | |
216 | hub->secondary_ref_clk = 1; | |
217 | break; | |
218 | default: | |
219 | dev_err(dev, | |
220 | "unsupported reference clock rate (%d)\n", | |
221 | (int) rate); | |
222 | return -EINVAL; | |
223 | } | |
224 | err = clk_set_rate(hub->clk, rate); | |
225 | if (err) { | |
226 | dev_err(dev, | |
227 | "unable to set reference clock rate to %d\n", | |
228 | (int) rate); | |
229 | return err; | |
230 | } | |
231 | } | |
232 | ||
233 | err = clk_prepare_enable(hub->clk); | |
234 | if (err) { | |
235 | dev_err(dev, | |
236 | "unable to enable reference clock\n"); | |
237 | return err; | |
238 | } | |
239 | } | |
240 | ||
e8b58b49 DK |
241 | property = of_get_property(np, "disabled-ports", &len); |
242 | if (property && (len / sizeof(u32)) > 0) { | |
243 | int i; | |
244 | for (i = 0; i < len / sizeof(u32); i++) { | |
245 | u32 port = be32_to_cpu(property[i]); | |
246 | if ((1 <= port) && (port <= 3)) | |
247 | hub->port_off_mask |= (1 << port); | |
248 | } | |
249 | } | |
250 | ||
42416cc8 | 251 | hub->gpio_intn = of_get_named_gpio(np, "intn-gpios", 0); |
eab8050c DK |
252 | if (hub->gpio_intn == -EPROBE_DEFER) |
253 | return -EPROBE_DEFER; | |
42416cc8 | 254 | hub->gpio_connect = of_get_named_gpio(np, "connect-gpios", 0); |
eab8050c DK |
255 | if (hub->gpio_connect == -EPROBE_DEFER) |
256 | return -EPROBE_DEFER; | |
ccf92c94 | 257 | hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0); |
eab8050c DK |
258 | if (hub->gpio_reset == -EPROBE_DEFER) |
259 | return -EPROBE_DEFER; | |
260 | of_property_read_u32(np, "initial-mode", &mode); | |
261 | hub->mode = mode; | |
6a099c63 DK |
262 | } |
263 | ||
3f0d1c67 MB |
264 | if (hub->port_off_mask && !hub->regmap) |
265 | dev_err(dev, "Ports disabled with no control interface\n"); | |
266 | ||
6a099c63 | 267 | if (gpio_is_valid(hub->gpio_intn)) { |
657d898a MS |
268 | int val = hub->secondary_ref_clk ? GPIOF_OUT_INIT_LOW : |
269 | GPIOF_OUT_INIT_HIGH; | |
270 | err = devm_gpio_request_one(dev, hub->gpio_intn, val, | |
271 | "usb3503 intn"); | |
6a099c63 | 272 | if (err) { |
2487e3ee | 273 | dev_err(dev, |
6b084421 | 274 | "unable to request GPIO %d as interrupt pin (%d)\n", |
2487e3ee | 275 | hub->gpio_intn, err); |
cffedd67 | 276 | return err; |
6a099c63 DK |
277 | } |
278 | } | |
279 | ||
280 | if (gpio_is_valid(hub->gpio_connect)) { | |
2487e3ee | 281 | err = devm_gpio_request_one(dev, hub->gpio_connect, |
8e7245b8 | 282 | GPIOF_OUT_INIT_LOW, "usb3503 connect"); |
6a099c63 | 283 | if (err) { |
2487e3ee MB |
284 | dev_err(dev, |
285 | "unable to request GPIO %d as connect pin (%d)\n", | |
286 | hub->gpio_connect, err); | |
cffedd67 | 287 | return err; |
6a099c63 DK |
288 | } |
289 | } | |
290 | ||
291 | if (gpio_is_valid(hub->gpio_reset)) { | |
2487e3ee | 292 | err = devm_gpio_request_one(dev, hub->gpio_reset, |
6a099c63 DK |
293 | GPIOF_OUT_INIT_LOW, "usb3503 reset"); |
294 | if (err) { | |
2487e3ee MB |
295 | dev_err(dev, |
296 | "unable to request GPIO %d as reset pin (%d)\n", | |
297 | hub->gpio_reset, err); | |
cffedd67 | 298 | return err; |
6a099c63 DK |
299 | } |
300 | } | |
301 | ||
eab8050c | 302 | usb3503_switch_mode(hub, hub->mode); |
6a099c63 | 303 | |
dd8e670d | 304 | dev_info(dev, "%s: probed in %s mode\n", __func__, |
6a099c63 DK |
305 | (hub->mode == USB3503_MODE_HUB) ? "hub" : "standby"); |
306 | ||
307 | return 0; | |
6a099c63 DK |
308 | } |
309 | ||
2487e3ee MB |
310 | static int usb3503_i2c_probe(struct i2c_client *i2c, |
311 | const struct i2c_device_id *id) | |
312 | { | |
313 | struct usb3503 *hub; | |
314 | int err; | |
315 | ||
316 | hub = devm_kzalloc(&i2c->dev, sizeof(struct usb3503), GFP_KERNEL); | |
317 | if (!hub) { | |
318 | dev_err(&i2c->dev, "private data alloc fail\n"); | |
319 | return -ENOMEM; | |
320 | } | |
321 | ||
322 | i2c_set_clientdata(i2c, hub); | |
323 | hub->regmap = devm_regmap_init_i2c(i2c, &usb3503_regmap_config); | |
324 | if (IS_ERR(hub->regmap)) { | |
325 | err = PTR_ERR(hub->regmap); | |
326 | dev_err(&i2c->dev, "Failed to initialise regmap: %d\n", err); | |
327 | return err; | |
328 | } | |
329 | hub->dev = &i2c->dev; | |
330 | ||
331 | return usb3503_probe(hub); | |
332 | } | |
333 | ||
3f0d1c67 MB |
334 | static int usb3503_platform_probe(struct platform_device *pdev) |
335 | { | |
336 | struct usb3503 *hub; | |
337 | ||
338 | hub = devm_kzalloc(&pdev->dev, sizeof(struct usb3503), GFP_KERNEL); | |
339 | if (!hub) { | |
340 | dev_err(&pdev->dev, "private data alloc fail\n"); | |
341 | return -ENOMEM; | |
342 | } | |
343 | hub->dev = &pdev->dev; | |
344 | ||
345 | return usb3503_probe(hub); | |
346 | } | |
347 | ||
ecdc071d JS |
348 | #ifdef CONFIG_PM_SLEEP |
349 | static int usb3503_i2c_suspend(struct device *dev) | |
350 | { | |
351 | struct i2c_client *client = to_i2c_client(dev); | |
352 | struct usb3503 *hub = i2c_get_clientdata(client); | |
353 | ||
354 | usb3503_switch_mode(hub, USB3503_MODE_STANDBY); | |
355 | ||
356 | if (hub->clk) | |
357 | clk_disable_unprepare(hub->clk); | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | static int usb3503_i2c_resume(struct device *dev) | |
363 | { | |
364 | struct i2c_client *client = to_i2c_client(dev); | |
365 | struct usb3503 *hub = i2c_get_clientdata(client); | |
366 | ||
367 | if (hub->clk) | |
368 | clk_prepare_enable(hub->clk); | |
369 | ||
370 | usb3503_switch_mode(hub, hub->mode); | |
371 | ||
372 | return 0; | |
373 | } | |
374 | #endif | |
375 | ||
376 | static SIMPLE_DEV_PM_OPS(usb3503_i2c_pm_ops, usb3503_i2c_suspend, | |
377 | usb3503_i2c_resume); | |
378 | ||
6a099c63 DK |
379 | static const struct i2c_device_id usb3503_id[] = { |
380 | { USB3503_I2C_NAME, 0 }, | |
381 | { } | |
382 | }; | |
383 | MODULE_DEVICE_TABLE(i2c, usb3503_id); | |
384 | ||
eab8050c DK |
385 | #ifdef CONFIG_OF |
386 | static const struct of_device_id usb3503_of_match[] = { | |
387 | { .compatible = "smsc,usb3503", }, | |
5bdd1f4a | 388 | { .compatible = "smsc,usb3503a", }, |
eab8050c DK |
389 | {}, |
390 | }; | |
391 | MODULE_DEVICE_TABLE(of, usb3503_of_match); | |
392 | #endif | |
393 | ||
3f0d1c67 | 394 | static struct i2c_driver usb3503_i2c_driver = { |
6a099c63 DK |
395 | .driver = { |
396 | .name = USB3503_I2C_NAME, | |
ecdc071d | 397 | .pm = &usb3503_i2c_pm_ops, |
eab8050c | 398 | .of_match_table = of_match_ptr(usb3503_of_match), |
6a099c63 | 399 | }, |
2487e3ee | 400 | .probe = usb3503_i2c_probe, |
6a099c63 DK |
401 | .id_table = usb3503_id, |
402 | }; | |
403 | ||
3f0d1c67 MB |
404 | static struct platform_driver usb3503_platform_driver = { |
405 | .driver = { | |
406 | .name = USB3503_I2C_NAME, | |
407 | .of_match_table = of_match_ptr(usb3503_of_match), | |
408 | .owner = THIS_MODULE, | |
409 | }, | |
410 | .probe = usb3503_platform_probe, | |
411 | }; | |
412 | ||
413 | static int __init usb3503_init(void) | |
414 | { | |
415 | int err; | |
416 | ||
417 | err = i2c_register_driver(THIS_MODULE, &usb3503_i2c_driver); | |
418 | if (err != 0) | |
419 | pr_err("usb3503: Failed to register I2C driver: %d\n", err); | |
420 | ||
421 | err = platform_driver_register(&usb3503_platform_driver); | |
422 | if (err != 0) | |
423 | pr_err("usb3503: Failed to register platform driver: %d\n", | |
424 | err); | |
425 | ||
426 | return 0; | |
427 | } | |
428 | module_init(usb3503_init); | |
429 | ||
430 | static void __exit usb3503_exit(void) | |
431 | { | |
432 | platform_driver_unregister(&usb3503_platform_driver); | |
433 | i2c_del_driver(&usb3503_i2c_driver); | |
434 | } | |
435 | module_exit(usb3503_exit); | |
6a099c63 DK |
436 | |
437 | MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>"); | |
438 | MODULE_DESCRIPTION("USB3503 USB HUB driver"); | |
439 | MODULE_LICENSE("GPL"); |