1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Motorola Mapphone MDM6600 modem GPIO controlled USB PHY driver |
4 | * Copyright (C) 2018 Tony Lindgren <tony@atomide.com> |
5 | */ |
6 | |
7 | #include <linux/delay.h> |
8 | #include <linux/err.h> |
9 | #include <linux/io.h> |
10 | #include <linux/interrupt.h> |
11 | #include <linux/module.h> |
12 | #include <linux/of.h> |
13 | #include <linux/platform_device.h> |
14 | #include <linux/slab.h> |
15 | |
16 | #include <linux/gpio/consumer.h> |
17 | #include <linux/of_platform.h> |
18 | #include <linux/phy/phy.h> |
19 | #include <linux/pinctrl/consumer.h> |
20 | |
21 | #define PHY_MDM6600_PHY_DELAY_MS 4000 /* PHY enable 2.2s to 3.5s */ |
22 | #define PHY_MDM6600_ENABLED_DELAY_MS 8000 /* 8s more total for MDM6600 */ |
23 | #define PHY_MDM6600_WAKE_KICK_MS 600 /* time on after GPIO toggle */ |
24 | #define MDM6600_MODEM_IDLE_DELAY_MS 1000 /* modem after USB suspend */ |
25 | #define MDM6600_MODEM_WAKE_DELAY_MS 200 /* modem response after idle */ |
26 | |
27 | enum phy_mdm6600_ctrl_lines { |
28 | PHY_MDM6600_ENABLE, /* USB PHY enable */ |
29 | PHY_MDM6600_POWER, /* Device power */ |
30 | PHY_MDM6600_RESET, /* Device reset */ |
31 | PHY_MDM6600_NR_CTRL_LINES, |
32 | }; |
33 | |
34 | enum phy_mdm6600_bootmode_lines { |
35 | PHY_MDM6600_MODE0, /* out USB mode0 and OOB wake */ |
36 | PHY_MDM6600_MODE1, /* out USB mode1, in OOB wake */ |
37 | PHY_MDM6600_NR_MODE_LINES, |
38 | }; |
39 | |
40 | enum phy_mdm6600_cmd_lines { |
41 | PHY_MDM6600_CMD0, |
42 | PHY_MDM6600_CMD1, |
43 | PHY_MDM6600_CMD2, |
44 | PHY_MDM6600_NR_CMD_LINES, |
45 | }; |
46 | |
47 | enum phy_mdm6600_status_lines { |
48 | PHY_MDM6600_STATUS0, |
49 | PHY_MDM6600_STATUS1, |
50 | PHY_MDM6600_STATUS2, |
51 | PHY_MDM6600_NR_STATUS_LINES, |
52 | }; |
53 | |
54 | /* |
55 | * MDM6600 command codes. These are based on Motorola Mapphone Linux |
56 | * kernel tree. |
57 | */ |
58 | enum phy_mdm6600_cmd { |
59 | PHY_MDM6600_CMD_BP_PANIC_ACK, |
60 | PHY_MDM6600_CMD_DATA_ONLY_BYPASS, /* Reroute USB to CPCAP PHY */ |
61 | PHY_MDM6600_CMD_FULL_BYPASS, /* Reroute USB to CPCAP PHY */ |
62 | PHY_MDM6600_CMD_NO_BYPASS, /* Request normal USB mode */ |
63 | PHY_MDM6600_CMD_BP_SHUTDOWN_REQ, /* Request device power off */ |
64 | PHY_MDM6600_CMD_BP_UNKNOWN_5, |
65 | PHY_MDM6600_CMD_BP_UNKNOWN_6, |
66 | PHY_MDM6600_CMD_UNDEFINED, |
67 | }; |
68 | |
69 | /* |
70 | * MDM6600 status codes. These are based on Motorola Mapphone Linux |
71 | * kernel tree. |
72 | */ |
73 | enum phy_mdm6600_status { |
74 | PHY_MDM6600_STATUS_PANIC, /* Seems to be really off */ |
75 | PHY_MDM6600_STATUS_PANIC_BUSY_WAIT, |
76 | PHY_MDM6600_STATUS_QC_DLOAD, |
77 | PHY_MDM6600_STATUS_RAM_DOWNLOADER, /* MDM6600 USB flashing mode */ |
78 | PHY_MDM6600_STATUS_PHONE_CODE_AWAKE, /* MDM6600 normal USB mode */ |
79 | PHY_MDM6600_STATUS_PHONE_CODE_ASLEEP, |
80 | PHY_MDM6600_STATUS_SHUTDOWN_ACK, |
81 | PHY_MDM6600_STATUS_UNDEFINED, |
82 | }; |
83 | |
84 | static const char * const |
85 | phy_mdm6600_status_name[] = { |
86 | "off" , "busy" , "qc_dl" , "ram_dl" , "awake" , |
87 | "asleep" , "shutdown" , "undefined" , |
88 | }; |
89 | |
90 | struct phy_mdm6600 { |
91 | struct device *dev; |
92 | struct phy *generic_phy; |
93 | struct phy_provider *phy_provider; |
94 | struct gpio_desc *ctrl_gpios[PHY_MDM6600_NR_CTRL_LINES]; |
95 | struct gpio_descs *mode_gpios; |
96 | struct gpio_descs *status_gpios; |
97 | struct gpio_descs *cmd_gpios; |
98 | struct delayed_work bootup_work; |
99 | struct delayed_work status_work; |
100 | struct delayed_work modem_wake_work; |
101 | struct completion ack; |
102 | bool enabled; /* mdm6600 phy enabled */ |
103 | bool running; /* mdm6600 boot done */ |
104 | bool awake; /* mdm6600 respnds on n_gsm */ |
105 | int status; |
106 | }; |
107 | |
108 | static int phy_mdm6600_init(struct phy *x) |
109 | { |
110 | struct phy_mdm6600 *ddata = phy_get_drvdata(phy: x); |
111 | struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE]; |
112 | |
113 | if (!ddata->enabled) |
114 | return -EPROBE_DEFER; |
115 | |
116 | gpiod_set_value_cansleep(desc: enable_gpio, value: 0); |
117 | |
118 | return 0; |
119 | } |
120 | |
121 | static int phy_mdm6600_power_on(struct phy *x) |
122 | { |
123 | struct phy_mdm6600 *ddata = phy_get_drvdata(phy: x); |
124 | struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE]; |
125 | |
126 | if (!ddata->enabled) |
127 | return -ENODEV; |
128 | |
129 | gpiod_set_value_cansleep(desc: enable_gpio, value: 1); |
130 | |
131 | /* Allow aggressive PM for USB, it's only needed for n_gsm port */ |
132 | if (pm_runtime_enabled(dev: &x->dev)) |
133 | phy_pm_runtime_put(phy: x); |
134 | |
135 | return 0; |
136 | } |
137 | |
138 | static int phy_mdm6600_power_off(struct phy *x) |
139 | { |
140 | struct phy_mdm6600 *ddata = phy_get_drvdata(phy: x); |
141 | struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE]; |
142 | int error; |
143 | |
144 | if (!ddata->enabled) |
145 | return -ENODEV; |
146 | |
147 | /* Paired with phy_pm_runtime_put() in phy_mdm6600_power_on() */ |
148 | if (pm_runtime_enabled(dev: &x->dev)) { |
149 | error = phy_pm_runtime_get(phy: x); |
150 | if (error < 0 && error != -EINPROGRESS) |
151 | dev_warn(ddata->dev, "%s: phy_pm_runtime_get: %i\n" , |
152 | __func__, error); |
153 | } |
154 | |
155 | gpiod_set_value_cansleep(desc: enable_gpio, value: 0); |
156 | |
157 | return 0; |
158 | } |
159 | |
160 | static const struct phy_ops gpio_usb_ops = { |
161 | .init = phy_mdm6600_init, |
162 | .power_on = phy_mdm6600_power_on, |
163 | .power_off = phy_mdm6600_power_off, |
164 | .owner = THIS_MODULE, |
165 | }; |
166 | |
167 | /** |
168 | * phy_mdm6600_cmd() - send a command request to mdm6600 |
169 | * @ddata: device driver data |
170 | * @val: value of cmd to be set |
171 | * |
172 | * Configures the three command request GPIOs to the specified value. |
173 | */ |
174 | static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val) |
175 | { |
176 | DECLARE_BITMAP(values, PHY_MDM6600_NR_CMD_LINES); |
177 | |
178 | values[0] = val; |
179 | |
180 | gpiod_set_array_value_cansleep(array_size: PHY_MDM6600_NR_CMD_LINES, |
181 | desc_array: ddata->cmd_gpios->desc, |
182 | array_info: ddata->cmd_gpios->info, value_bitmap: values); |
183 | } |
184 | |
185 | /** |
186 | * phy_mdm6600_status() - read mdm6600 status lines |
187 | * @work: work structure |
188 | */ |
189 | static void phy_mdm6600_status(struct work_struct *work) |
190 | { |
191 | struct phy_mdm6600 *ddata; |
192 | struct device *dev; |
193 | DECLARE_BITMAP(values, PHY_MDM6600_NR_STATUS_LINES); |
194 | int error; |
195 | |
196 | ddata = container_of(work, struct phy_mdm6600, status_work.work); |
197 | dev = ddata->dev; |
198 | |
199 | error = gpiod_get_array_value_cansleep(array_size: PHY_MDM6600_NR_STATUS_LINES, |
200 | desc_array: ddata->status_gpios->desc, |
201 | array_info: ddata->status_gpios->info, |
202 | value_bitmap: values); |
203 | if (error) |
204 | return; |
205 | |
206 | ddata->status = values[0] & ((1 << PHY_MDM6600_NR_STATUS_LINES) - 1); |
207 | |
208 | dev_info(dev, "modem status: %i %s\n" , |
209 | ddata->status, |
210 | phy_mdm6600_status_name[ddata->status]); |
211 | complete(&ddata->ack); |
212 | } |
213 | |
214 | static irqreturn_t phy_mdm6600_irq_thread(int irq, void *data) |
215 | { |
216 | struct phy_mdm6600 *ddata = data; |
217 | |
218 | schedule_delayed_work(dwork: &ddata->status_work, delay: msecs_to_jiffies(m: 10)); |
219 | |
220 | return IRQ_HANDLED; |
221 | } |
222 | |
223 | /** |
224 | * phy_mdm6600_wakeirq_thread - handle mode1 line OOB wake after booting |
225 | * @irq: interrupt |
226 | * @data: interrupt handler data |
227 | * |
228 | * GPIO mode1 is used initially as output to configure the USB boot |
229 | * mode for mdm6600. After booting it is used as input for OOB wake |
230 | * signal from mdm6600 to the SoC. Just use it for debug info only |
231 | * for now. |
232 | */ |
233 | static irqreturn_t phy_mdm6600_wakeirq_thread(int irq, void *data) |
234 | { |
235 | struct phy_mdm6600 *ddata = data; |
236 | struct gpio_desc *mode_gpio1; |
237 | int error, wakeup; |
238 | |
239 | mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1]; |
240 | wakeup = gpiod_get_value(desc: mode_gpio1); |
241 | if (!wakeup) |
242 | return IRQ_NONE; |
243 | |
244 | dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n" , wakeup); |
245 | error = pm_runtime_get_sync(dev: ddata->dev); |
246 | if (error < 0) { |
247 | pm_runtime_put_noidle(dev: ddata->dev); |
248 | |
249 | return IRQ_NONE; |
250 | } |
251 | |
252 | /* Just wake-up and kick the autosuspend timer */ |
253 | pm_runtime_mark_last_busy(dev: ddata->dev); |
254 | pm_runtime_put_autosuspend(dev: ddata->dev); |
255 | |
256 | return IRQ_HANDLED; |
257 | } |
258 | |
259 | /** |
260 | * phy_mdm6600_init_irq() - initialize mdm6600 status IRQ lines |
261 | * @ddata: device driver data |
262 | */ |
263 | static void phy_mdm6600_init_irq(struct phy_mdm6600 *ddata) |
264 | { |
265 | struct device *dev = ddata->dev; |
266 | int i, error, irq; |
267 | |
268 | for (i = PHY_MDM6600_STATUS0; |
269 | i <= PHY_MDM6600_STATUS2; i++) { |
270 | struct gpio_desc *gpio = ddata->status_gpios->desc[i]; |
271 | |
272 | irq = gpiod_to_irq(desc: gpio); |
273 | if (irq <= 0) |
274 | continue; |
275 | |
276 | error = devm_request_threaded_irq(dev, irq, NULL, |
277 | thread_fn: phy_mdm6600_irq_thread, |
278 | IRQF_TRIGGER_RISING | |
279 | IRQF_TRIGGER_FALLING | |
280 | IRQF_ONESHOT, |
281 | devname: "mdm6600" , |
282 | dev_id: ddata); |
283 | if (error) |
284 | dev_warn(dev, "no modem status irq%i: %i\n" , |
285 | irq, error); |
286 | } |
287 | } |
288 | |
289 | struct phy_mdm6600_map { |
290 | const char *name; |
291 | int direction; |
292 | }; |
293 | |
294 | static const struct phy_mdm6600_map |
295 | phy_mdm6600_ctrl_gpio_map[PHY_MDM6600_NR_CTRL_LINES] = { |
296 | { "enable" , GPIOD_OUT_LOW, }, /* low = phy disabled */ |
297 | { "power" , GPIOD_OUT_LOW, }, /* low = off */ |
298 | { "reset" , GPIOD_OUT_HIGH, }, /* high = reset */ |
299 | }; |
300 | |
301 | /** |
302 | * phy_mdm6600_init_lines() - initialize mdm6600 GPIO lines |
303 | * @ddata: device driver data |
304 | */ |
305 | static int phy_mdm6600_init_lines(struct phy_mdm6600 *ddata) |
306 | { |
307 | struct device *dev = ddata->dev; |
308 | int i; |
309 | |
310 | /* MDM6600 control lines */ |
311 | for (i = 0; i < ARRAY_SIZE(phy_mdm6600_ctrl_gpio_map); i++) { |
312 | const struct phy_mdm6600_map *map = |
313 | &phy_mdm6600_ctrl_gpio_map[i]; |
314 | struct gpio_desc **gpio = &ddata->ctrl_gpios[i]; |
315 | |
316 | *gpio = devm_gpiod_get(dev, con_id: map->name, flags: map->direction); |
317 | if (IS_ERR(ptr: *gpio)) { |
318 | dev_info(dev, "gpio %s error %li\n" , |
319 | map->name, PTR_ERR(*gpio)); |
320 | return PTR_ERR(ptr: *gpio); |
321 | } |
322 | } |
323 | |
324 | /* MDM6600 USB start-up mode output lines */ |
325 | ddata->mode_gpios = devm_gpiod_get_array(dev, con_id: "motorola,mode" , |
326 | flags: GPIOD_OUT_LOW); |
327 | if (IS_ERR(ptr: ddata->mode_gpios)) |
328 | return PTR_ERR(ptr: ddata->mode_gpios); |
329 | |
330 | if (ddata->mode_gpios->ndescs != PHY_MDM6600_NR_MODE_LINES) |
331 | return -EINVAL; |
332 | |
333 | /* MDM6600 status input lines */ |
334 | ddata->status_gpios = devm_gpiod_get_array(dev, con_id: "motorola,status" , |
335 | flags: GPIOD_IN); |
336 | if (IS_ERR(ptr: ddata->status_gpios)) |
337 | return PTR_ERR(ptr: ddata->status_gpios); |
338 | |
339 | if (ddata->status_gpios->ndescs != PHY_MDM6600_NR_STATUS_LINES) |
340 | return -EINVAL; |
341 | |
342 | /* MDM6600 cmd output lines */ |
343 | ddata->cmd_gpios = devm_gpiod_get_array(dev, con_id: "motorola,cmd" , |
344 | flags: GPIOD_OUT_LOW); |
345 | if (IS_ERR(ptr: ddata->cmd_gpios)) |
346 | return PTR_ERR(ptr: ddata->cmd_gpios); |
347 | |
348 | if (ddata->cmd_gpios->ndescs != PHY_MDM6600_NR_CMD_LINES) |
349 | return -EINVAL; |
350 | |
351 | return 0; |
352 | } |
353 | |
354 | /** |
355 | * phy_mdm6600_device_power_on() - power on mdm6600 device |
356 | * @ddata: device driver data |
357 | * |
358 | * To get the integrated USB phy in MDM6600 takes some hoops. We must ensure |
359 | * the shared USB bootmode GPIOs are configured, then request modem start-up, |
360 | * reset and power-up.. And then we need to recycle the shared USB bootmode |
361 | * GPIOs as they are also used for Out of Band (OOB) wake for the USB and |
362 | * TS 27.010 serial mux. |
363 | */ |
364 | static int phy_mdm6600_device_power_on(struct phy_mdm6600 *ddata) |
365 | { |
366 | struct gpio_desc *mode_gpio0, *mode_gpio1, *reset_gpio, *power_gpio; |
367 | int error = 0, wakeirq; |
368 | |
369 | mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0]; |
370 | mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1]; |
371 | reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET]; |
372 | power_gpio = ddata->ctrl_gpios[PHY_MDM6600_POWER]; |
373 | |
374 | /* |
375 | * Shared GPIOs must be low for normal USB mode. After booting |
376 | * they are used for OOB wake signaling. These can be also used |
377 | * to configure USB flashing mode later on based on a module |
378 | * parameter. |
379 | */ |
380 | gpiod_set_value_cansleep(desc: mode_gpio0, value: 0); |
381 | gpiod_set_value_cansleep(desc: mode_gpio1, value: 0); |
382 | |
383 | /* Request start-up mode */ |
384 | phy_mdm6600_cmd(ddata, val: PHY_MDM6600_CMD_NO_BYPASS); |
385 | |
386 | /* Request a reset first */ |
387 | gpiod_set_value_cansleep(desc: reset_gpio, value: 0); |
388 | msleep(msecs: 100); |
389 | |
390 | /* Toggle power GPIO to request mdm6600 to start */ |
391 | gpiod_set_value_cansleep(desc: power_gpio, value: 1); |
392 | msleep(msecs: 100); |
393 | gpiod_set_value_cansleep(desc: power_gpio, value: 0); |
394 | |
395 | /* |
396 | * Looks like the USB PHY needs between 2.2 to 4 seconds. |
397 | * If we try to use it before that, we will get L3 errors |
398 | * from omap-usb-host trying to access the PHY. See also |
399 | * phy_mdm6600_init() for -EPROBE_DEFER. |
400 | */ |
401 | msleep(PHY_MDM6600_PHY_DELAY_MS); |
402 | ddata->enabled = true; |
403 | |
404 | /* Booting up the rest of MDM6600 will take total about 8 seconds */ |
405 | dev_info(ddata->dev, "Waiting for power up request to complete..\n" ); |
406 | if (wait_for_completion_timeout(x: &ddata->ack, |
407 | timeout: msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS))) { |
408 | if (ddata->status > PHY_MDM6600_STATUS_PANIC && |
409 | ddata->status < PHY_MDM6600_STATUS_SHUTDOWN_ACK) |
410 | dev_info(ddata->dev, "Powered up OK\n" ); |
411 | } else { |
412 | ddata->enabled = false; |
413 | error = -ETIMEDOUT; |
414 | dev_err(ddata->dev, "Timed out powering up\n" ); |
415 | } |
416 | |
417 | /* Reconfigure mode1 GPIO as input for OOB wake */ |
418 | gpiod_direction_input(desc: mode_gpio1); |
419 | |
420 | wakeirq = gpiod_to_irq(desc: mode_gpio1); |
421 | if (wakeirq <= 0) |
422 | return wakeirq; |
423 | |
424 | error = devm_request_threaded_irq(dev: ddata->dev, irq: wakeirq, NULL, |
425 | thread_fn: phy_mdm6600_wakeirq_thread, |
426 | IRQF_TRIGGER_RISING | |
427 | IRQF_TRIGGER_FALLING | |
428 | IRQF_ONESHOT, |
429 | devname: "mdm6600-wake" , |
430 | dev_id: ddata); |
431 | if (error) |
432 | dev_warn(ddata->dev, "no modem wakeirq irq%i: %i\n" , |
433 | wakeirq, error); |
434 | |
435 | ddata->running = true; |
436 | |
437 | return error; |
438 | } |
439 | |
440 | /** |
441 | * phy_mdm6600_device_power_off() - power off mdm6600 device |
442 | * @ddata: device driver data |
443 | */ |
444 | static void phy_mdm6600_device_power_off(struct phy_mdm6600 *ddata) |
445 | { |
446 | struct gpio_desc *reset_gpio = |
447 | ddata->ctrl_gpios[PHY_MDM6600_RESET]; |
448 | int error; |
449 | |
450 | ddata->enabled = false; |
451 | phy_mdm6600_cmd(ddata, val: PHY_MDM6600_CMD_BP_SHUTDOWN_REQ); |
452 | msleep(msecs: 100); |
453 | |
454 | gpiod_set_value_cansleep(desc: reset_gpio, value: 1); |
455 | |
456 | dev_info(ddata->dev, "Waiting for power down request to complete.. " ); |
457 | if (wait_for_completion_timeout(x: &ddata->ack, |
458 | timeout: msecs_to_jiffies(m: 5000))) { |
459 | if (ddata->status == PHY_MDM6600_STATUS_PANIC) |
460 | dev_info(ddata->dev, "Powered down OK\n" ); |
461 | } else { |
462 | dev_err(ddata->dev, "Timed out powering down\n" ); |
463 | } |
464 | |
465 | /* |
466 | * Keep reset gpio high with padconf internal pull-up resistor to |
467 | * prevent modem from waking up during deeper SoC idle states. The |
468 | * gpio bank lines can have glitches if not in the always-on wkup |
469 | * domain. |
470 | */ |
471 | error = pinctrl_pm_select_sleep_state(dev: ddata->dev); |
472 | if (error) |
473 | dev_warn(ddata->dev, "%s: error with sleep_state: %i\n" , |
474 | __func__, error); |
475 | } |
476 | |
477 | static void phy_mdm6600_deferred_power_on(struct work_struct *work) |
478 | { |
479 | struct phy_mdm6600 *ddata; |
480 | int error; |
481 | |
482 | ddata = container_of(work, struct phy_mdm6600, bootup_work.work); |
483 | |
484 | error = phy_mdm6600_device_power_on(ddata); |
485 | if (error) |
486 | dev_err(ddata->dev, "Device not functional\n" ); |
487 | } |
488 | |
489 | /* |
490 | * USB suspend puts mdm6600 into low power mode. For any n_gsm using apps, |
491 | * we need to keep the modem awake by kicking it's mode0 GPIO. This will |
492 | * keep the modem awake for about 1.2 seconds. When no n_gsm apps are using |
493 | * the modem, runtime PM auto mode can be enabled so modem can enter low |
494 | * power mode. |
495 | */ |
496 | static void phy_mdm6600_wake_modem(struct phy_mdm6600 *ddata) |
497 | { |
498 | struct gpio_desc *mode_gpio0; |
499 | |
500 | mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0]; |
501 | gpiod_set_value_cansleep(desc: mode_gpio0, value: 1); |
502 | usleep_range(min: 5, max: 15); |
503 | gpiod_set_value_cansleep(desc: mode_gpio0, value: 0); |
504 | if (ddata->awake) |
505 | usleep_range(min: 5, max: 15); |
506 | else |
507 | msleep(MDM6600_MODEM_WAKE_DELAY_MS); |
508 | } |
509 | |
510 | static void phy_mdm6600_modem_wake(struct work_struct *work) |
511 | { |
512 | struct phy_mdm6600 *ddata; |
513 | |
514 | ddata = container_of(work, struct phy_mdm6600, modem_wake_work.work); |
515 | phy_mdm6600_wake_modem(ddata); |
516 | |
517 | /* |
518 | * The modem does not always stay awake 1.2 seconds after toggling |
519 | * the wake GPIO, and sometimes it idles after about some 600 ms |
520 | * making writes time out. |
521 | */ |
522 | schedule_delayed_work(dwork: &ddata->modem_wake_work, |
523 | delay: msecs_to_jiffies(PHY_MDM6600_WAKE_KICK_MS)); |
524 | } |
525 | |
526 | static int __maybe_unused phy_mdm6600_runtime_suspend(struct device *dev) |
527 | { |
528 | struct phy_mdm6600 *ddata = dev_get_drvdata(dev); |
529 | |
530 | cancel_delayed_work_sync(dwork: &ddata->modem_wake_work); |
531 | ddata->awake = false; |
532 | |
533 | return 0; |
534 | } |
535 | |
536 | static int __maybe_unused phy_mdm6600_runtime_resume(struct device *dev) |
537 | { |
538 | struct phy_mdm6600 *ddata = dev_get_drvdata(dev); |
539 | |
540 | phy_mdm6600_modem_wake(work: &ddata->modem_wake_work.work); |
541 | ddata->awake = true; |
542 | |
543 | return 0; |
544 | } |
545 | |
546 | static const struct dev_pm_ops phy_mdm6600_pm_ops = { |
547 | SET_RUNTIME_PM_OPS(phy_mdm6600_runtime_suspend, |
548 | phy_mdm6600_runtime_resume, NULL) |
549 | }; |
550 | |
551 | static const struct of_device_id phy_mdm6600_id_table[] = { |
552 | { .compatible = "motorola,mapphone-mdm6600" , }, |
553 | {}, |
554 | }; |
555 | MODULE_DEVICE_TABLE(of, phy_mdm6600_id_table); |
556 | |
557 | static int phy_mdm6600_probe(struct platform_device *pdev) |
558 | { |
559 | struct phy_mdm6600 *ddata; |
560 | int error; |
561 | |
562 | ddata = devm_kzalloc(dev: &pdev->dev, size: sizeof(*ddata), GFP_KERNEL); |
563 | if (!ddata) |
564 | return -ENOMEM; |
565 | |
566 | INIT_DELAYED_WORK(&ddata->bootup_work, |
567 | phy_mdm6600_deferred_power_on); |
568 | INIT_DELAYED_WORK(&ddata->status_work, phy_mdm6600_status); |
569 | INIT_DELAYED_WORK(&ddata->modem_wake_work, phy_mdm6600_modem_wake); |
570 | init_completion(x: &ddata->ack); |
571 | |
572 | ddata->dev = &pdev->dev; |
573 | platform_set_drvdata(pdev, data: ddata); |
574 | |
575 | error = phy_mdm6600_init_lines(ddata); |
576 | if (error) |
577 | return error; |
578 | |
579 | phy_mdm6600_init_irq(ddata); |
580 | schedule_delayed_work(dwork: &ddata->bootup_work, delay: 0); |
581 | |
582 | /* |
583 | * See phy_mdm6600_device_power_on(). We should be able |
584 | * to remove this eventually when ohci-platform can deal |
585 | * with -EPROBE_DEFER. |
586 | */ |
587 | msleep(PHY_MDM6600_PHY_DELAY_MS + 500); |
588 | |
589 | /* |
590 | * Enable PM runtime only after PHY has been powered up properly. |
591 | * It is currently only needed after USB suspends mdm6600 and n_gsm |
592 | * needs to access the device. We don't want to do this earlier as |
593 | * gpio mode0 pin doubles as mdm6600 wake-up gpio. |
594 | */ |
595 | pm_runtime_use_autosuspend(dev: ddata->dev); |
596 | pm_runtime_set_autosuspend_delay(dev: ddata->dev, |
597 | MDM6600_MODEM_IDLE_DELAY_MS); |
598 | pm_runtime_enable(dev: ddata->dev); |
599 | error = pm_runtime_get_sync(dev: ddata->dev); |
600 | if (error < 0) { |
601 | dev_warn(ddata->dev, "failed to wake modem: %i\n" , error); |
602 | pm_runtime_put_noidle(dev: ddata->dev); |
603 | goto cleanup; |
604 | } |
605 | |
606 | ddata->generic_phy = devm_phy_create(dev: ddata->dev, NULL, ops: &gpio_usb_ops); |
607 | if (IS_ERR(ptr: ddata->generic_phy)) { |
608 | error = PTR_ERR(ptr: ddata->generic_phy); |
609 | goto idle; |
610 | } |
611 | |
612 | phy_set_drvdata(phy: ddata->generic_phy, data: ddata); |
613 | |
614 | ddata->phy_provider = |
615 | devm_of_phy_provider_register(ddata->dev, |
616 | of_phy_simple_xlate); |
617 | if (IS_ERR(ptr: ddata->phy_provider)) |
618 | error = PTR_ERR(ptr: ddata->phy_provider); |
619 | |
620 | idle: |
621 | pm_runtime_mark_last_busy(dev: ddata->dev); |
622 | pm_runtime_put_autosuspend(dev: ddata->dev); |
623 | |
624 | cleanup: |
625 | if (error < 0) { |
626 | phy_mdm6600_device_power_off(ddata); |
627 | pm_runtime_disable(dev: ddata->dev); |
628 | pm_runtime_dont_use_autosuspend(dev: ddata->dev); |
629 | } |
630 | |
631 | return error; |
632 | } |
633 | |
634 | static void phy_mdm6600_remove(struct platform_device *pdev) |
635 | { |
636 | struct phy_mdm6600 *ddata = platform_get_drvdata(pdev); |
637 | struct gpio_desc *reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET]; |
638 | |
639 | pm_runtime_get_noresume(dev: ddata->dev); |
640 | pm_runtime_dont_use_autosuspend(dev: ddata->dev); |
641 | pm_runtime_put_sync(dev: ddata->dev); |
642 | pm_runtime_disable(dev: ddata->dev); |
643 | |
644 | if (!ddata->running) |
645 | wait_for_completion_timeout(x: &ddata->ack, |
646 | timeout: msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS)); |
647 | |
648 | gpiod_set_value_cansleep(desc: reset_gpio, value: 1); |
649 | phy_mdm6600_device_power_off(ddata); |
650 | |
651 | cancel_delayed_work_sync(dwork: &ddata->modem_wake_work); |
652 | cancel_delayed_work_sync(dwork: &ddata->bootup_work); |
653 | cancel_delayed_work_sync(dwork: &ddata->status_work); |
654 | } |
655 | |
656 | static struct platform_driver phy_mdm6600_driver = { |
657 | .probe = phy_mdm6600_probe, |
658 | .remove_new = phy_mdm6600_remove, |
659 | .driver = { |
660 | .name = "phy-mapphone-mdm6600" , |
661 | .pm = &phy_mdm6600_pm_ops, |
662 | .of_match_table = of_match_ptr(phy_mdm6600_id_table), |
663 | }, |
664 | }; |
665 | |
666 | module_platform_driver(phy_mdm6600_driver); |
667 | |
668 | MODULE_ALIAS("platform:gpio_usb" ); |
669 | MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>" ); |
670 | MODULE_DESCRIPTION("mdm6600 gpio usb phy driver" ); |
671 | MODULE_LICENSE("GPL v2" ); |
672 | |