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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>
21#include <linux/pm_runtime.h>
22
23#include "internal.h"
24
25ACPI_MODULE_NAME("acpi_lpss");
26
27#define LPSS_CLK_SIZE 0x04
28#define LPSS_LTR_SIZE 0x18
29
30
31#define LPSS_GENERAL 0x08
32#define LPSS_GENERAL_LTR_MODE_SW BIT(2)
33#define LPSS_GENERAL_UART_RTS_OVRD BIT(3)
34#define LPSS_SW_LTR 0x10
35#define LPSS_AUTO_LTR 0x14
36#define LPSS_TX_INT 0x20
37#define LPSS_TX_INT_MASK BIT(1)
38
39struct lpss_shared_clock {
40 const char *name;
41 unsigned long rate;
42 struct clk *clk;
43};
44
45struct lpss_private_data;
46
47struct lpss_device_desc {
48 bool clk_required;
49 const char *clkdev_name;
50 bool ltr_required;
51 unsigned int prv_offset;
52 size_t prv_size_override;
53 bool clk_gate;
54 struct lpss_shared_clock *shared_clock;
55 void (*setup)(struct lpss_private_data *pdata);
56};
57
58static struct lpss_device_desc lpss_dma_desc = {
59 .clk_required = true,
60 .clkdev_name = "hclk",
61};
62
63struct lpss_private_data {
64 void __iomem *mmio_base;
65 resource_size_t mmio_size;
66 struct clk *clk;
67 const struct lpss_device_desc *dev_desc;
68};
69
70static void lpss_uart_setup(struct lpss_private_data *pdata)
71{
72 unsigned int offset;
73 u32 reg;
74
75 offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;
76 reg = readl(pdata->mmio_base + offset);
77 writel(reg | LPSS_TX_INT_MASK, pdata->mmio_base + offset);
78
79 offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;
80 reg = readl(pdata->mmio_base + offset);
81 writel(reg | LPSS_GENERAL_UART_RTS_OVRD, pdata->mmio_base + offset);
82}
83
84static struct lpss_device_desc lpt_dev_desc = {
85 .clk_required = true,
86 .prv_offset = 0x800,
87 .ltr_required = true,
88 .clk_gate = true,
89};
90
91static struct lpss_device_desc lpt_uart_dev_desc = {
92 .clk_required = true,
93 .prv_offset = 0x800,
94 .ltr_required = true,
95 .clk_gate = true,
96 .setup = lpss_uart_setup,
97};
98
99static struct lpss_device_desc lpt_sdio_dev_desc = {
100 .prv_offset = 0x1000,
101 .prv_size_override = 0x1018,
102 .ltr_required = true,
103};
104
105static struct lpss_shared_clock uart_clock = {
106 .name = "uart_clk",
107 .rate = 44236800,
108};
109
110static struct lpss_device_desc byt_uart_dev_desc = {
111 .clk_required = true,
112 .prv_offset = 0x800,
113 .clk_gate = true,
114 .shared_clock = &uart_clock,
115 .setup = lpss_uart_setup,
116};
117
118static struct lpss_shared_clock spi_clock = {
119 .name = "spi_clk",
120 .rate = 50000000,
121};
122
123static struct lpss_device_desc byt_spi_dev_desc = {
124 .clk_required = true,
125 .prv_offset = 0x400,
126 .clk_gate = true,
127 .shared_clock = &spi_clock,
128};
129
130static struct lpss_device_desc byt_sdio_dev_desc = {
131 .clk_required = true,
132};
133
134static struct lpss_shared_clock i2c_clock = {
135 .name = "i2c_clk",
136 .rate = 100000000,
137};
138
139static struct lpss_device_desc byt_i2c_dev_desc = {
140 .clk_required = true,
141 .prv_offset = 0x800,
142 .shared_clock = &i2c_clock,
143};
144
145static const struct acpi_device_id acpi_lpss_device_ids[] = {
146
147 { "INTL9C60", (unsigned long)&lpss_dma_desc },
148
149
150 { "INT33C0", (unsigned long)&lpt_dev_desc },
151 { "INT33C1", (unsigned long)&lpt_dev_desc },
152 { "INT33C2", (unsigned long)&lpt_dev_desc },
153 { "INT33C3", (unsigned long)&lpt_dev_desc },
154 { "INT33C4", (unsigned long)&lpt_uart_dev_desc },
155 { "INT33C5", (unsigned long)&lpt_uart_dev_desc },
156 { "INT33C6", (unsigned long)&lpt_sdio_dev_desc },
157 { "INT33C7", },
158
159
160 { "80860F0A", (unsigned long)&byt_uart_dev_desc },
161 { "80860F0E", (unsigned long)&byt_spi_dev_desc },
162 { "80860F14", (unsigned long)&byt_sdio_dev_desc },
163 { "80860F41", (unsigned long)&byt_i2c_dev_desc },
164 { "INT33B2", },
165
166 { "INT3430", (unsigned long)&lpt_dev_desc },
167 { "INT3431", (unsigned long)&lpt_dev_desc },
168 { "INT3432", (unsigned long)&lpt_dev_desc },
169 { "INT3433", (unsigned long)&lpt_dev_desc },
170 { "INT3434", (unsigned long)&lpt_uart_dev_desc },
171 { "INT3435", (unsigned long)&lpt_uart_dev_desc },
172 { "INT3436", (unsigned long)&lpt_sdio_dev_desc },
173 { "INT3437", },
174
175 { }
176};
177
178static int is_memory(struct acpi_resource *res, void *not_used)
179{
180 struct resource r;
181 return !acpi_dev_resource_memory(res, &r);
182}
183
184
185static struct platform_device *lpss_clk_dev;
186
187static inline void lpt_register_clock_device(void)
188{
189 lpss_clk_dev = platform_device_register_simple("clk-lpt", -1, NULL, 0);
190}
191
192static int register_device_clock(struct acpi_device *adev,
193 struct lpss_private_data *pdata)
194{
195 const struct lpss_device_desc *dev_desc = pdata->dev_desc;
196 struct lpss_shared_clock *shared_clock = dev_desc->shared_clock;
197 struct clk *clk = ERR_PTR(-ENODEV);
198 struct lpss_clk_data *clk_data;
199 const char *parent;
200
201 if (!lpss_clk_dev)
202 lpt_register_clock_device();
203
204 clk_data = platform_get_drvdata(lpss_clk_dev);
205 if (!clk_data)
206 return -ENODEV;
207
208 if (dev_desc->clkdev_name) {
209 clk_register_clkdev(clk_data->clk, dev_desc->clkdev_name,
210 dev_name(&adev->dev));
211 return 0;
212 }
213
214 if (!pdata->mmio_base
215 || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
216 return -ENODATA;
217
218 parent = clk_data->name;
219
220 if (shared_clock) {
221 clk = shared_clock->clk;
222 if (!clk) {
223 clk = clk_register_fixed_rate(NULL, shared_clock->name,
224 "lpss_clk", 0,
225 shared_clock->rate);
226 shared_clock->clk = clk;
227 }
228 parent = shared_clock->name;
229 }
230
231 if (dev_desc->clk_gate) {
232 clk = clk_register_gate(NULL, dev_name(&adev->dev), parent, 0,
233 pdata->mmio_base + dev_desc->prv_offset,
234 0, 0, NULL);
235 pdata->clk = clk;
236 }
237
238 if (IS_ERR(clk))
239 return PTR_ERR(clk);
240
241 clk_register_clkdev(clk, NULL, dev_name(&adev->dev));
242 return 0;
243}
244
245static int acpi_lpss_create_device(struct acpi_device *adev,
246 const struct acpi_device_id *id)
247{
248 struct lpss_device_desc *dev_desc;
249 struct lpss_private_data *pdata;
250 struct resource_list_entry *rentry;
251 struct list_head resource_list;
252 int ret;
253
254 dev_desc = (struct lpss_device_desc *)id->driver_data;
255 if (!dev_desc)
256 return acpi_create_platform_device(adev, id);
257
258 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
259 if (!pdata)
260 return -ENOMEM;
261
262 INIT_LIST_HEAD(&resource_list);
263 ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL);
264 if (ret < 0)
265 goto err_out;
266
267 list_for_each_entry(rentry, &resource_list, node)
268 if (resource_type(&rentry->res) == IORESOURCE_MEM) {
269 if (dev_desc->prv_size_override)
270 pdata->mmio_size = dev_desc->prv_size_override;
271 else
272 pdata->mmio_size = resource_size(&rentry->res);
273 pdata->mmio_base = ioremap(rentry->res.start,
274 pdata->mmio_size);
275 break;
276 }
277
278 acpi_dev_free_resource_list(&resource_list);
279
280 pdata->dev_desc = dev_desc;
281
282 if (dev_desc->clk_required) {
283 ret = register_device_clock(adev, pdata);
284 if (ret) {
285
286 ret = 0;
287 goto err_out;
288 }
289 }
290
291
292
293
294
295
296 ret = acpi_device_fix_up_power(adev);
297 if (ret) {
298
299 ret = 0;
300 goto err_out;
301 }
302
303 if (dev_desc->setup)
304 dev_desc->setup(pdata);
305
306 adev->driver_data = pdata;
307 ret = acpi_create_platform_device(adev, id);
308 if (ret > 0)
309 return ret;
310
311 adev->driver_data = NULL;
312
313 err_out:
314 kfree(pdata);
315 return ret;
316}
317
318static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
319{
320 struct acpi_device *adev;
321 struct lpss_private_data *pdata;
322 unsigned long flags;
323 int ret;
324
325 ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev);
326 if (WARN_ON(ret))
327 return ret;
328
329 spin_lock_irqsave(&dev->power.lock, flags);
330 if (pm_runtime_suspended(dev)) {
331 ret = -EAGAIN;
332 goto out;
333 }
334 pdata = acpi_driver_data(adev);
335 if (WARN_ON(!pdata || !pdata->mmio_base)) {
336 ret = -ENODEV;
337 goto out;
338 }
339 *val = readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
340
341 out:
342 spin_unlock_irqrestore(&dev->power.lock, flags);
343 return ret;
344}
345
346static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr,
347 char *buf)
348{
349 u32 ltr_value = 0;
350 unsigned int reg;
351 int ret;
352
353 reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;
354 ret = lpss_reg_read(dev, reg, <r_value);
355 if (ret)
356 return ret;
357
358 return snprintf(buf, PAGE_SIZE, "%08x\n", ltr_value);
359}
360
361static ssize_t lpss_ltr_mode_show(struct device *dev,
362 struct device_attribute *attr, char *buf)
363{
364 u32 ltr_mode = 0;
365 char *outstr;
366 int ret;
367
368 ret = lpss_reg_read(dev, LPSS_GENERAL, <r_mode);
369 if (ret)
370 return ret;
371
372 outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto";
373 return sprintf(buf, "%s\n", outstr);
374}
375
376static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL);
377static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL);
378static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL);
379
380static struct attribute *lpss_attrs[] = {
381 &dev_attr_auto_ltr.attr,
382 &dev_attr_sw_ltr.attr,
383 &dev_attr_ltr_mode.attr,
384 NULL,
385};
386
387static struct attribute_group lpss_attr_group = {
388 .attrs = lpss_attrs,
389 .name = "lpss_ltr",
390};
391
392static int acpi_lpss_platform_notify(struct notifier_block *nb,
393 unsigned long action, void *data)
394{
395 struct platform_device *pdev = to_platform_device(data);
396 struct lpss_private_data *pdata;
397 struct acpi_device *adev;
398 const struct acpi_device_id *id;
399 int ret = 0;
400
401 id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);
402 if (!id || !id->driver_data)
403 return 0;
404
405 if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
406 return 0;
407
408 pdata = acpi_driver_data(adev);
409 if (!pdata || !pdata->mmio_base || !pdata->dev_desc->ltr_required)
410 return 0;
411
412 if (pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {
413 dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");
414 return 0;
415 }
416
417 if (action == BUS_NOTIFY_ADD_DEVICE)
418 ret = sysfs_create_group(&pdev->dev.kobj, &lpss_attr_group);
419 else if (action == BUS_NOTIFY_DEL_DEVICE)
420 sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
421
422 return ret;
423}
424
425static struct notifier_block acpi_lpss_nb = {
426 .notifier_call = acpi_lpss_platform_notify,
427};
428
429static struct acpi_scan_handler lpss_handler = {
430 .ids = acpi_lpss_device_ids,
431 .attach = acpi_lpss_create_device,
432};
433
434void __init acpi_lpss_init(void)
435{
436 if (!lpt_clk_init()) {
437 bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
438 acpi_scan_add_handler(&lpss_handler);
439 }
440}
441
