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Rafael J. Wysockif58b0822013-03-06 23:46:20 +01001/*
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>
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +010021#include <linux/pm_runtime.h>
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010022
23#include "internal.h"
24
25ACPI_MODULE_NAME("acpi_lpss");
26
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010027#define LPSS_CLK_SIZE 0x04
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +010028#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
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010035
36struct lpss_device_desc {
37 bool clk_required;
Rafael J. Wysockib59cc202013-05-08 11:55:49 +030038 const char *clkdev_name;
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +010039 bool ltr_required;
40 unsigned int prv_offset;
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010041};
42
Rafael J. Wysockib59cc202013-05-08 11:55:49 +030043static struct lpss_device_desc lpss_dma_desc = {
44 .clk_required = true,
45 .clkdev_name = "hclk",
46};
47
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010048struct lpss_private_data {
49 void __iomem *mmio_base;
50 resource_size_t mmio_size;
51 struct clk *clk;
52 const struct lpss_device_desc *dev_desc;
53};
54
55static struct lpss_device_desc lpt_dev_desc = {
56 .clk_required = true,
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +010057 .prv_offset = 0x800,
58 .ltr_required = true,
59};
60
61static struct lpss_device_desc lpt_sdio_dev_desc = {
62 .prv_offset = 0x1000,
63 .ltr_required = true,
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010064};
65
66static const struct acpi_device_id acpi_lpss_device_ids[] = {
Rafael J. Wysockib59cc202013-05-08 11:55:49 +030067 /* Generic LPSS devices */
68 { "INTL9C60", (unsigned long)&lpss_dma_desc },
69
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010070 /* Lynxpoint LPSS devices */
71 { "INT33C0", (unsigned long)&lpt_dev_desc },
72 { "INT33C1", (unsigned long)&lpt_dev_desc },
73 { "INT33C2", (unsigned long)&lpt_dev_desc },
74 { "INT33C3", (unsigned long)&lpt_dev_desc },
75 { "INT33C4", (unsigned long)&lpt_dev_desc },
76 { "INT33C5", (unsigned long)&lpt_dev_desc },
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +010077 { "INT33C6", (unsigned long)&lpt_sdio_dev_desc },
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010078 { "INT33C7", },
79
80 { }
81};
82
83static int is_memory(struct acpi_resource *res, void *not_used)
84{
85 struct resource r;
86 return !acpi_dev_resource_memory(res, &r);
87}
88
89/* LPSS main clock device. */
90static struct platform_device *lpss_clk_dev;
91
92static inline void lpt_register_clock_device(void)
93{
94 lpss_clk_dev = platform_device_register_simple("clk-lpt", -1, NULL, 0);
95}
96
97static int register_device_clock(struct acpi_device *adev,
98 struct lpss_private_data *pdata)
99{
100 const struct lpss_device_desc *dev_desc = pdata->dev_desc;
Rafael J. Wysockib59cc202013-05-08 11:55:49 +0300101 struct lpss_clk_data *clk_data;
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100102
103 if (!lpss_clk_dev)
104 lpt_register_clock_device();
105
Rafael J. Wysockib59cc202013-05-08 11:55:49 +0300106 clk_data = platform_get_drvdata(lpss_clk_dev);
107 if (!clk_data)
108 return -ENODEV;
109
110 if (dev_desc->clkdev_name) {
111 clk_register_clkdev(clk_data->clk, dev_desc->clkdev_name,
112 dev_name(&adev->dev));
113 return 0;
114 }
115
116 if (!pdata->mmio_base
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100117 || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100118 return -ENODATA;
119
120 pdata->clk = clk_register_gate(NULL, dev_name(&adev->dev),
Rafael J. Wysockib59cc202013-05-08 11:55:49 +0300121 clk_data->name, 0,
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100122 pdata->mmio_base + dev_desc->prv_offset,
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100123 0, 0, NULL);
124 if (IS_ERR(pdata->clk))
125 return PTR_ERR(pdata->clk);
126
127 clk_register_clkdev(pdata->clk, NULL, dev_name(&adev->dev));
128 return 0;
129}
130
131static int acpi_lpss_create_device(struct acpi_device *adev,
132 const struct acpi_device_id *id)
133{
134 struct lpss_device_desc *dev_desc;
135 struct lpss_private_data *pdata;
136 struct resource_list_entry *rentry;
137 struct list_head resource_list;
138 int ret;
139
140 dev_desc = (struct lpss_device_desc *)id->driver_data;
141 if (!dev_desc)
142 return acpi_create_platform_device(adev, id);
143
144 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
145 if (!pdata)
146 return -ENOMEM;
147
148 INIT_LIST_HEAD(&resource_list);
149 ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL);
150 if (ret < 0)
151 goto err_out;
152
153 list_for_each_entry(rentry, &resource_list, node)
154 if (resource_type(&rentry->res) == IORESOURCE_MEM) {
155 pdata->mmio_size = resource_size(&rentry->res);
156 pdata->mmio_base = ioremap(rentry->res.start,
157 pdata->mmio_size);
158 pdata->dev_desc = dev_desc;
159 break;
160 }
161
162 acpi_dev_free_resource_list(&resource_list);
163
164 if (dev_desc->clk_required) {
165 ret = register_device_clock(adev, pdata);
166 if (ret) {
167 /*
168 * Skip the device, but don't terminate the namespace
169 * scan.
170 */
Andy Shevchenkocf8df962013-03-20 12:14:30 +0000171 kfree(pdata);
172 return 0;
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100173 }
174 }
175
176 adev->driver_data = pdata;
177 ret = acpi_create_platform_device(adev, id);
178 if (ret > 0)
179 return ret;
180
181 adev->driver_data = NULL;
182
183 err_out:
184 kfree(pdata);
185 return ret;
186}
187
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100188static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
189{
190 struct acpi_device *adev;
191 struct lpss_private_data *pdata;
192 unsigned long flags;
193 int ret;
194
195 ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev);
196 if (WARN_ON(ret))
197 return ret;
198
199 spin_lock_irqsave(&dev->power.lock, flags);
200 if (pm_runtime_suspended(dev)) {
201 ret = -EAGAIN;
202 goto out;
203 }
204 pdata = acpi_driver_data(adev);
205 if (WARN_ON(!pdata || !pdata->mmio_base)) {
206 ret = -ENODEV;
207 goto out;
208 }
209 *val = readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
210
211 out:
212 spin_unlock_irqrestore(&dev->power.lock, flags);
213 return ret;
214}
215
216static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr,
217 char *buf)
218{
219 u32 ltr_value = 0;
220 unsigned int reg;
221 int ret;
222
223 reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;
224 ret = lpss_reg_read(dev, reg, &ltr_value);
225 if (ret)
226 return ret;
227
228 return snprintf(buf, PAGE_SIZE, "%08x\n", ltr_value);
229}
230
231static ssize_t lpss_ltr_mode_show(struct device *dev,
232 struct device_attribute *attr, char *buf)
233{
234 u32 ltr_mode = 0;
235 char *outstr;
236 int ret;
237
238 ret = lpss_reg_read(dev, LPSS_GENERAL, &ltr_mode);
239 if (ret)
240 return ret;
241
242 outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto";
243 return sprintf(buf, "%s\n", outstr);
244}
245
246static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL);
247static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL);
248static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL);
249
250static struct attribute *lpss_attrs[] = {
251 &dev_attr_auto_ltr.attr,
252 &dev_attr_sw_ltr.attr,
253 &dev_attr_ltr_mode.attr,
254 NULL,
255};
256
257static struct attribute_group lpss_attr_group = {
258 .attrs = lpss_attrs,
259 .name = "lpss_ltr",
260};
261
262static int acpi_lpss_platform_notify(struct notifier_block *nb,
263 unsigned long action, void *data)
264{
265 struct platform_device *pdev = to_platform_device(data);
266 struct lpss_private_data *pdata;
267 struct acpi_device *adev;
268 const struct acpi_device_id *id;
269 int ret = 0;
270
271 id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);
272 if (!id || !id->driver_data)
273 return 0;
274
275 if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
276 return 0;
277
278 pdata = acpi_driver_data(adev);
279 if (!pdata || !pdata->mmio_base || !pdata->dev_desc->ltr_required)
280 return 0;
281
282 if (pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {
283 dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");
284 return 0;
285 }
286
287 if (action == BUS_NOTIFY_ADD_DEVICE)
288 ret = sysfs_create_group(&pdev->dev.kobj, &lpss_attr_group);
289 else if (action == BUS_NOTIFY_DEL_DEVICE)
290 sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
291
292 return ret;
293}
294
295static struct notifier_block acpi_lpss_nb = {
296 .notifier_call = acpi_lpss_platform_notify,
297};
298
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100299static struct acpi_scan_handler lpss_handler = {
300 .ids = acpi_lpss_device_ids,
301 .attach = acpi_lpss_create_device,
302};
303
304void __init acpi_lpss_init(void)
305{
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100306 if (!lpt_clk_init()) {
307 bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100308 acpi_scan_add_handler(&lpss_handler);
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100309 }
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100310}