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f58b082a RW |
1 | /* |
2 | * ACPI support for Intel Lynxpoint LPSS. | |
3 | * | |
4 | * Copyright (C) 2013, Intel Corporation | |
5 | * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> | |
6 | * Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/acpi.h> | |
14 | #include <linux/clk.h> | |
15 | #include <linux/clkdev.h> | |
16 | #include <linux/clk-provider.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/io.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/platform_data/clk-lpss.h> | |
2e0f8822 | 21 | #include <linux/pm_runtime.h> |
f58b082a RW |
22 | |
23 | #include "internal.h" | |
24 | ||
25 | ACPI_MODULE_NAME("acpi_lpss"); | |
26 | ||
f58b082a | 27 | #define LPSS_CLK_SIZE 0x04 |
2e0f8822 RW |
28 | #define LPSS_LTR_SIZE 0x18 |
29 | ||
30 | /* Offsets relative to LPSS_PRIVATE_OFFSET */ | |
31 | #define LPSS_GENERAL 0x08 | |
32 | #define LPSS_GENERAL_LTR_MODE_SW BIT(2) | |
33 | #define LPSS_SW_LTR 0x10 | |
34 | #define LPSS_AUTO_LTR 0x14 | |
06d86415 HK |
35 | #define LPSS_TX_INT 0x20 |
36 | #define LPSS_TX_INT_MASK BIT(1) | |
f58b082a | 37 | |
f6272170 MW |
38 | struct lpss_shared_clock { |
39 | const char *name; | |
40 | unsigned long rate; | |
41 | struct clk *clk; | |
42 | }; | |
43 | ||
06d86415 | 44 | struct lpss_private_data; |
f58b082a RW |
45 | |
46 | struct lpss_device_desc { | |
47 | bool clk_required; | |
b59cc200 | 48 | const char *clkdev_name; |
2e0f8822 RW |
49 | bool ltr_required; |
50 | unsigned int prv_offset; | |
958c4eb2 | 51 | size_t prv_size_override; |
f6272170 MW |
52 | bool clk_gate; |
53 | struct lpss_shared_clock *shared_clock; | |
06d86415 | 54 | void (*setup)(struct lpss_private_data *pdata); |
f58b082a RW |
55 | }; |
56 | ||
b59cc200 RW |
57 | static struct lpss_device_desc lpss_dma_desc = { |
58 | .clk_required = true, | |
59 | .clkdev_name = "hclk", | |
60 | }; | |
61 | ||
f58b082a RW |
62 | struct lpss_private_data { |
63 | void __iomem *mmio_base; | |
64 | resource_size_t mmio_size; | |
65 | struct clk *clk; | |
66 | const struct lpss_device_desc *dev_desc; | |
67 | }; | |
68 | ||
06d86415 HK |
69 | static void lpss_uart_setup(struct lpss_private_data *pdata) |
70 | { | |
71 | unsigned int tx_int_offset = pdata->dev_desc->prv_offset + LPSS_TX_INT; | |
72 | u32 reg; | |
73 | ||
74 | reg = readl(pdata->mmio_base + tx_int_offset); | |
75 | writel(reg | LPSS_TX_INT_MASK, pdata->mmio_base + tx_int_offset); | |
76 | } | |
77 | ||
f58b082a RW |
78 | static struct lpss_device_desc lpt_dev_desc = { |
79 | .clk_required = true, | |
2e0f8822 RW |
80 | .prv_offset = 0x800, |
81 | .ltr_required = true, | |
f6272170 | 82 | .clk_gate = true, |
2e0f8822 RW |
83 | }; |
84 | ||
06d86415 HK |
85 | static struct lpss_device_desc lpt_uart_dev_desc = { |
86 | .clk_required = true, | |
87 | .prv_offset = 0x800, | |
88 | .ltr_required = true, | |
89 | .clk_gate = true, | |
90 | .setup = lpss_uart_setup, | |
2e0f8822 RW |
91 | }; |
92 | ||
93 | static struct lpss_device_desc lpt_sdio_dev_desc = { | |
94 | .prv_offset = 0x1000, | |
958c4eb2 | 95 | .prv_size_override = 0x1018, |
2e0f8822 | 96 | .ltr_required = true, |
f58b082a RW |
97 | }; |
98 | ||
f6272170 MW |
99 | static struct lpss_shared_clock uart_clock = { |
100 | .name = "uart_clk", | |
101 | .rate = 44236800, | |
102 | }; | |
103 | ||
104 | static struct lpss_device_desc byt_uart_dev_desc = { | |
105 | .clk_required = true, | |
106 | .prv_offset = 0x800, | |
107 | .clk_gate = true, | |
108 | .shared_clock = &uart_clock, | |
06d86415 | 109 | .setup = lpss_uart_setup, |
f6272170 MW |
110 | }; |
111 | ||
112 | static struct lpss_shared_clock spi_clock = { | |
113 | .name = "spi_clk", | |
114 | .rate = 50000000, | |
115 | }; | |
116 | ||
117 | static struct lpss_device_desc byt_spi_dev_desc = { | |
118 | .clk_required = true, | |
119 | .prv_offset = 0x400, | |
120 | .clk_gate = true, | |
121 | .shared_clock = &spi_clock, | |
122 | }; | |
123 | ||
124 | static struct lpss_device_desc byt_sdio_dev_desc = { | |
125 | .clk_required = true, | |
126 | }; | |
127 | ||
128 | static struct lpss_shared_clock i2c_clock = { | |
129 | .name = "i2c_clk", | |
130 | .rate = 100000000, | |
131 | }; | |
132 | ||
133 | static struct lpss_device_desc byt_i2c_dev_desc = { | |
134 | .clk_required = true, | |
135 | .prv_offset = 0x800, | |
136 | .shared_clock = &i2c_clock, | |
137 | }; | |
138 | ||
f58b082a | 139 | static const struct acpi_device_id acpi_lpss_device_ids[] = { |
b59cc200 RW |
140 | /* Generic LPSS devices */ |
141 | { "INTL9C60", (unsigned long)&lpss_dma_desc }, | |
142 | ||
f58b082a RW |
143 | /* Lynxpoint LPSS devices */ |
144 | { "INT33C0", (unsigned long)&lpt_dev_desc }, | |
145 | { "INT33C1", (unsigned long)&lpt_dev_desc }, | |
146 | { "INT33C2", (unsigned long)&lpt_dev_desc }, | |
147 | { "INT33C3", (unsigned long)&lpt_dev_desc }, | |
06d86415 HK |
148 | { "INT33C4", (unsigned long)&lpt_uart_dev_desc }, |
149 | { "INT33C5", (unsigned long)&lpt_uart_dev_desc }, | |
2e0f8822 | 150 | { "INT33C6", (unsigned long)&lpt_sdio_dev_desc }, |
f58b082a RW |
151 | { "INT33C7", }, |
152 | ||
f6272170 MW |
153 | /* BayTrail LPSS devices */ |
154 | { "80860F0A", (unsigned long)&byt_uart_dev_desc }, | |
155 | { "80860F0E", (unsigned long)&byt_spi_dev_desc }, | |
156 | { "80860F14", (unsigned long)&byt_sdio_dev_desc }, | |
157 | { "80860F41", (unsigned long)&byt_i2c_dev_desc }, | |
158 | { "INT33B2", }, | |
159 | ||
f58b082a RW |
160 | { } |
161 | }; | |
162 | ||
163 | static int is_memory(struct acpi_resource *res, void *not_used) | |
164 | { | |
165 | struct resource r; | |
166 | return !acpi_dev_resource_memory(res, &r); | |
167 | } | |
168 | ||
169 | /* LPSS main clock device. */ | |
170 | static struct platform_device *lpss_clk_dev; | |
171 | ||
172 | static inline void lpt_register_clock_device(void) | |
173 | { | |
174 | lpss_clk_dev = platform_device_register_simple("clk-lpt", -1, NULL, 0); | |
175 | } | |
176 | ||
177 | static int register_device_clock(struct acpi_device *adev, | |
178 | struct lpss_private_data *pdata) | |
179 | { | |
180 | const struct lpss_device_desc *dev_desc = pdata->dev_desc; | |
f6272170 MW |
181 | struct lpss_shared_clock *shared_clock = dev_desc->shared_clock; |
182 | struct clk *clk = ERR_PTR(-ENODEV); | |
b59cc200 | 183 | struct lpss_clk_data *clk_data; |
f6272170 | 184 | const char *parent; |
f58b082a RW |
185 | |
186 | if (!lpss_clk_dev) | |
187 | lpt_register_clock_device(); | |
188 | ||
b59cc200 RW |
189 | clk_data = platform_get_drvdata(lpss_clk_dev); |
190 | if (!clk_data) | |
191 | return -ENODEV; | |
192 | ||
193 | if (dev_desc->clkdev_name) { | |
194 | clk_register_clkdev(clk_data->clk, dev_desc->clkdev_name, | |
195 | dev_name(&adev->dev)); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | if (!pdata->mmio_base | |
2e0f8822 | 200 | || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE) |
f58b082a RW |
201 | return -ENODATA; |
202 | ||
f6272170 MW |
203 | parent = clk_data->name; |
204 | ||
205 | if (shared_clock) { | |
206 | clk = shared_clock->clk; | |
207 | if (!clk) { | |
208 | clk = clk_register_fixed_rate(NULL, shared_clock->name, | |
209 | "lpss_clk", 0, | |
210 | shared_clock->rate); | |
211 | shared_clock->clk = clk; | |
212 | } | |
213 | parent = shared_clock->name; | |
214 | } | |
215 | ||
216 | if (dev_desc->clk_gate) { | |
217 | clk = clk_register_gate(NULL, dev_name(&adev->dev), parent, 0, | |
218 | pdata->mmio_base + dev_desc->prv_offset, | |
219 | 0, 0, NULL); | |
220 | pdata->clk = clk; | |
221 | } | |
f58b082a | 222 | |
f6272170 MW |
223 | if (IS_ERR(clk)) |
224 | return PTR_ERR(clk); | |
f58b082a | 225 | |
f6272170 | 226 | clk_register_clkdev(clk, NULL, dev_name(&adev->dev)); |
f58b082a RW |
227 | return 0; |
228 | } | |
229 | ||
230 | static int acpi_lpss_create_device(struct acpi_device *adev, | |
231 | const struct acpi_device_id *id) | |
232 | { | |
233 | struct lpss_device_desc *dev_desc; | |
234 | struct lpss_private_data *pdata; | |
235 | struct resource_list_entry *rentry; | |
236 | struct list_head resource_list; | |
237 | int ret; | |
238 | ||
239 | dev_desc = (struct lpss_device_desc *)id->driver_data; | |
240 | if (!dev_desc) | |
241 | return acpi_create_platform_device(adev, id); | |
242 | ||
243 | pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); | |
244 | if (!pdata) | |
245 | return -ENOMEM; | |
246 | ||
247 | INIT_LIST_HEAD(&resource_list); | |
248 | ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL); | |
249 | if (ret < 0) | |
250 | goto err_out; | |
251 | ||
252 | list_for_each_entry(rentry, &resource_list, node) | |
253 | if (resource_type(&rentry->res) == IORESOURCE_MEM) { | |
958c4eb2 MW |
254 | if (dev_desc->prv_size_override) |
255 | pdata->mmio_size = dev_desc->prv_size_override; | |
256 | else | |
257 | pdata->mmio_size = resource_size(&rentry->res); | |
f58b082a RW |
258 | pdata->mmio_base = ioremap(rentry->res.start, |
259 | pdata->mmio_size); | |
260 | pdata->dev_desc = dev_desc; | |
261 | break; | |
262 | } | |
263 | ||
264 | acpi_dev_free_resource_list(&resource_list); | |
265 | ||
266 | if (dev_desc->clk_required) { | |
267 | ret = register_device_clock(adev, pdata); | |
268 | if (ret) { | |
b9e95fc6 RW |
269 | /* Skip the device, but continue the namespace scan. */ |
270 | ret = 0; | |
271 | goto err_out; | |
f58b082a RW |
272 | } |
273 | } | |
274 | ||
b9e95fc6 RW |
275 | /* |
276 | * This works around a known issue in ACPI tables where LPSS devices | |
277 | * have _PS0 and _PS3 without _PSC (and no power resources), so | |
278 | * acpi_bus_init_power() will assume that the BIOS has put them into D0. | |
279 | */ | |
280 | ret = acpi_device_fix_up_power(adev); | |
281 | if (ret) { | |
282 | /* Skip the device, but continue the namespace scan. */ | |
283 | ret = 0; | |
284 | goto err_out; | |
285 | } | |
286 | ||
06d86415 HK |
287 | if (dev_desc->setup) |
288 | dev_desc->setup(pdata); | |
289 | ||
f58b082a RW |
290 | adev->driver_data = pdata; |
291 | ret = acpi_create_platform_device(adev, id); | |
292 | if (ret > 0) | |
293 | return ret; | |
294 | ||
295 | adev->driver_data = NULL; | |
296 | ||
297 | err_out: | |
298 | kfree(pdata); | |
299 | return ret; | |
300 | } | |
301 | ||
2e0f8822 RW |
302 | static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val) |
303 | { | |
304 | struct acpi_device *adev; | |
305 | struct lpss_private_data *pdata; | |
306 | unsigned long flags; | |
307 | int ret; | |
308 | ||
309 | ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev); | |
310 | if (WARN_ON(ret)) | |
311 | return ret; | |
312 | ||
313 | spin_lock_irqsave(&dev->power.lock, flags); | |
314 | if (pm_runtime_suspended(dev)) { | |
315 | ret = -EAGAIN; | |
316 | goto out; | |
317 | } | |
318 | pdata = acpi_driver_data(adev); | |
319 | if (WARN_ON(!pdata || !pdata->mmio_base)) { | |
320 | ret = -ENODEV; | |
321 | goto out; | |
322 | } | |
323 | *val = readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg); | |
324 | ||
325 | out: | |
326 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
327 | return ret; | |
328 | } | |
329 | ||
330 | static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr, | |
331 | char *buf) | |
332 | { | |
333 | u32 ltr_value = 0; | |
334 | unsigned int reg; | |
335 | int ret; | |
336 | ||
337 | reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR; | |
338 | ret = lpss_reg_read(dev, reg, <r_value); | |
339 | if (ret) | |
340 | return ret; | |
341 | ||
342 | return snprintf(buf, PAGE_SIZE, "%08x\n", ltr_value); | |
343 | } | |
344 | ||
345 | static ssize_t lpss_ltr_mode_show(struct device *dev, | |
346 | struct device_attribute *attr, char *buf) | |
347 | { | |
348 | u32 ltr_mode = 0; | |
349 | char *outstr; | |
350 | int ret; | |
351 | ||
352 | ret = lpss_reg_read(dev, LPSS_GENERAL, <r_mode); | |
353 | if (ret) | |
354 | return ret; | |
355 | ||
356 | outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto"; | |
357 | return sprintf(buf, "%s\n", outstr); | |
358 | } | |
359 | ||
360 | static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL); | |
361 | static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL); | |
362 | static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL); | |
363 | ||
364 | static struct attribute *lpss_attrs[] = { | |
365 | &dev_attr_auto_ltr.attr, | |
366 | &dev_attr_sw_ltr.attr, | |
367 | &dev_attr_ltr_mode.attr, | |
368 | NULL, | |
369 | }; | |
370 | ||
371 | static struct attribute_group lpss_attr_group = { | |
372 | .attrs = lpss_attrs, | |
373 | .name = "lpss_ltr", | |
374 | }; | |
375 | ||
376 | static int acpi_lpss_platform_notify(struct notifier_block *nb, | |
377 | unsigned long action, void *data) | |
378 | { | |
379 | struct platform_device *pdev = to_platform_device(data); | |
380 | struct lpss_private_data *pdata; | |
381 | struct acpi_device *adev; | |
382 | const struct acpi_device_id *id; | |
383 | int ret = 0; | |
384 | ||
385 | id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev); | |
386 | if (!id || !id->driver_data) | |
387 | return 0; | |
388 | ||
389 | if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev)) | |
390 | return 0; | |
391 | ||
392 | pdata = acpi_driver_data(adev); | |
393 | if (!pdata || !pdata->mmio_base || !pdata->dev_desc->ltr_required) | |
394 | return 0; | |
395 | ||
396 | if (pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) { | |
397 | dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n"); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | if (action == BUS_NOTIFY_ADD_DEVICE) | |
402 | ret = sysfs_create_group(&pdev->dev.kobj, &lpss_attr_group); | |
403 | else if (action == BUS_NOTIFY_DEL_DEVICE) | |
404 | sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group); | |
405 | ||
406 | return ret; | |
407 | } | |
408 | ||
409 | static struct notifier_block acpi_lpss_nb = { | |
410 | .notifier_call = acpi_lpss_platform_notify, | |
411 | }; | |
412 | ||
f58b082a RW |
413 | static struct acpi_scan_handler lpss_handler = { |
414 | .ids = acpi_lpss_device_ids, | |
415 | .attach = acpi_lpss_create_device, | |
416 | }; | |
417 | ||
418 | void __init acpi_lpss_init(void) | |
419 | { | |
2e0f8822 RW |
420 | if (!lpt_clk_init()) { |
421 | bus_register_notifier(&platform_bus_type, &acpi_lpss_nb); | |
f58b082a | 422 | acpi_scan_add_handler(&lpss_handler); |
2e0f8822 | 423 | } |
f58b082a | 424 | } |