Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 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> |
Rafael J. Wysocki | 2e0f882 | 2013-03-06 23:46:28 +0100 | [diff] [blame] | 21 | #include <linux/pm_runtime.h> |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 22 | |
| 23 | #include "internal.h" |
| 24 | |
| 25 | ACPI_MODULE_NAME("acpi_lpss"); |
| 26 | |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 27 | #define LPSS_CLK_SIZE 0x04 |
Rafael J. Wysocki | 2e0f882 | 2013-03-06 23:46:28 +0100 | [diff] [blame] | 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 |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 35 | |
| 36 | struct lpss_device_desc { |
| 37 | bool clk_required; |
Rafael J. Wysocki | b59cc20 | 2013-05-08 11:55:49 +0300 | [diff] [blame] | 38 | const char *clkdev_name; |
Rafael J. Wysocki | 2e0f882 | 2013-03-06 23:46:28 +0100 | [diff] [blame] | 39 | bool ltr_required; |
| 40 | unsigned int prv_offset; |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 41 | }; |
| 42 | |
Rafael J. Wysocki | b59cc20 | 2013-05-08 11:55:49 +0300 | [diff] [blame] | 43 | static struct lpss_device_desc lpss_dma_desc = { |
| 44 | .clk_required = true, |
| 45 | .clkdev_name = "hclk", |
| 46 | }; |
| 47 | |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 48 | struct 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 | |
| 55 | static struct lpss_device_desc lpt_dev_desc = { |
| 56 | .clk_required = true, |
Rafael J. Wysocki | 2e0f882 | 2013-03-06 23:46:28 +0100 | [diff] [blame] | 57 | .prv_offset = 0x800, |
| 58 | .ltr_required = true, |
| 59 | }; |
| 60 | |
| 61 | static struct lpss_device_desc lpt_sdio_dev_desc = { |
| 62 | .prv_offset = 0x1000, |
| 63 | .ltr_required = true, |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 64 | }; |
| 65 | |
| 66 | static const struct acpi_device_id acpi_lpss_device_ids[] = { |
Rafael J. Wysocki | b59cc20 | 2013-05-08 11:55:49 +0300 | [diff] [blame] | 67 | /* Generic LPSS devices */ |
| 68 | { "INTL9C60", (unsigned long)&lpss_dma_desc }, |
| 69 | |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 70 | /* 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. Wysocki | 2e0f882 | 2013-03-06 23:46:28 +0100 | [diff] [blame] | 77 | { "INT33C6", (unsigned long)&lpt_sdio_dev_desc }, |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 78 | { "INT33C7", }, |
| 79 | |
| 80 | { } |
| 81 | }; |
| 82 | |
| 83 | static 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. */ |
| 90 | static struct platform_device *lpss_clk_dev; |
| 91 | |
| 92 | static inline void lpt_register_clock_device(void) |
| 93 | { |
| 94 | lpss_clk_dev = platform_device_register_simple("clk-lpt", -1, NULL, 0); |
| 95 | } |
| 96 | |
| 97 | static 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. Wysocki | b59cc20 | 2013-05-08 11:55:49 +0300 | [diff] [blame] | 101 | struct lpss_clk_data *clk_data; |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 102 | |
| 103 | if (!lpss_clk_dev) |
| 104 | lpt_register_clock_device(); |
| 105 | |
Rafael J. Wysocki | b59cc20 | 2013-05-08 11:55:49 +0300 | [diff] [blame] | 106 | 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. Wysocki | 2e0f882 | 2013-03-06 23:46:28 +0100 | [diff] [blame] | 117 | || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE) |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 118 | return -ENODATA; |
| 119 | |
| 120 | pdata->clk = clk_register_gate(NULL, dev_name(&adev->dev), |
Rafael J. Wysocki | b59cc20 | 2013-05-08 11:55:49 +0300 | [diff] [blame] | 121 | clk_data->name, 0, |
Rafael J. Wysocki | 2e0f882 | 2013-03-06 23:46:28 +0100 | [diff] [blame] | 122 | pdata->mmio_base + dev_desc->prv_offset, |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 123 | 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 | |
| 131 | static 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 Shevchenko | cf8df96 | 2013-03-20 12:14:30 +0000 | [diff] [blame] | 171 | kfree(pdata); |
| 172 | return 0; |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 173 | } |
| 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. Wysocki | 2e0f882 | 2013-03-06 23:46:28 +0100 | [diff] [blame] | 188 | static 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 | |
| 216 | static 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, <r_value); |
| 225 | if (ret) |
| 226 | return ret; |
| 227 | |
| 228 | return snprintf(buf, PAGE_SIZE, "%08x\n", ltr_value); |
| 229 | } |
| 230 | |
| 231 | static 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, <r_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 | |
| 246 | static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL); |
| 247 | static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL); |
| 248 | static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL); |
| 249 | |
| 250 | static 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 | |
| 257 | static struct attribute_group lpss_attr_group = { |
| 258 | .attrs = lpss_attrs, |
| 259 | .name = "lpss_ltr", |
| 260 | }; |
| 261 | |
| 262 | static 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 | |
| 295 | static struct notifier_block acpi_lpss_nb = { |
| 296 | .notifier_call = acpi_lpss_platform_notify, |
| 297 | }; |
| 298 | |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 299 | static struct acpi_scan_handler lpss_handler = { |
| 300 | .ids = acpi_lpss_device_ids, |
| 301 | .attach = acpi_lpss_create_device, |
| 302 | }; |
| 303 | |
| 304 | void __init acpi_lpss_init(void) |
| 305 | { |
Rafael J. Wysocki | 2e0f882 | 2013-03-06 23:46:28 +0100 | [diff] [blame] | 306 | if (!lpt_clk_init()) { |
| 307 | bus_register_notifier(&platform_bus_type, &acpi_lpss_nb); |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 308 | acpi_scan_add_handler(&lpss_handler); |
Rafael J. Wysocki | 2e0f882 | 2013-03-06 23:46:28 +0100 | [diff] [blame] | 309 | } |
Rafael J. Wysocki | f58b082 | 2013-03-06 23:46:20 +0100 | [diff] [blame] | 310 | } |