drivers/acpi/acpi_apd.c

   1 /*
   2  * AMD ACPI support for ACPI2platform device.
   3  *
   4  * Copyright (c) 2014,2015 AMD Corporation.
   5  * Authors: Ken Xue <Ken.Xue@amd.com>
   6  *      Wu, Jeff <Jeff.Wu@amd.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/clk-provider.h>
  14 #include <linux/platform_data/clk-st.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm_domain.h>
  17 #include <linux/clkdev.h>
  18 #include <linux/acpi.h>
  19 #include <linux/err.h>
  20 #include <linux/pm.h>
  21
  22 #include "internal.h"
  23
  24 ACPI_MODULE_NAME("acpi_apd");
  25 struct apd_private_data;
  26
  27 /**
  28  * ACPI_APD_SYSFS : add device attributes in sysfs
  29  * ACPI_APD_PM : attach power domain to device
  30  */
  31 #define ACPI_APD_SYSFS  BIT(0)
  32 #define ACPI_APD_PM     BIT(1)
  33
  34 /**
  35  * struct apd_device_desc - a descriptor for apd device
  36  * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
  37  * @fixed_clk_rate: fixed rate input clock source for acpi device;
  38  *                      0 means no fixed rate input clock source
  39  * @setup: a hook routine to set device resource during create platform device
  40  *
  41  * Device description defined as acpi_device_id.driver_data
  42  */
  43 struct apd_device_desc {
  44         unsigned int flags;
  45         unsigned int fixed_clk_rate;
  46         struct property_entry *properties;
  47         int (*setup)(struct apd_private_data *pdata);
  48 };
  49
  50 struct apd_private_data {
  51         struct clk *clk;
  52         struct acpi_device *adev;
  53         const struct apd_device_desc *dev_desc;
  54 };
  55
  56 #if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
  57 #define APD_ADDR(desc)  ((unsigned long)&desc)
  58
  59 static int acpi_apd_setup(struct apd_private_data *pdata)
  60 {
  61         const struct apd_device_desc *dev_desc = pdata->dev_desc;
  62         struct clk *clk = ERR_PTR(-ENODEV);
  63
  64         if (dev_desc->fixed_clk_rate) {
  65                 clk = clk_register_fixed_rate(&pdata->adev->dev,
  66                                         dev_name(&pdata->adev->dev),
  67                                         NULL, 0, dev_desc->fixed_clk_rate);
  68                 clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
  69                 pdata->clk = clk;
  70         }
  71
  72         return 0;
  73 }
  74
  75 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
  76
  77 static int misc_check_res(struct acpi_resource *ares, void *data)
  78 {
  79         struct resource res;
  80
  81         return !acpi_dev_resource_memory(ares, &res);
  82 }
  83
  84 static int st_misc_setup(struct apd_private_data *pdata)
  85 {
  86         struct acpi_device *adev = pdata->adev;
  87         struct platform_device *clkdev;
  88         struct st_clk_data *clk_data;
  89         struct resource_entry *rentry;
  90         struct list_head resource_list;
  91         int ret;
  92
  93         clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
  94         if (!clk_data)
  95                 return -ENOMEM;
  96
  97         INIT_LIST_HEAD(&resource_list);
  98         ret = acpi_dev_get_resources(adev, &resource_list, misc_check_res,
  99                                      NULL);
 100         if (ret < 0)
 101                 return -ENOENT;
 102
 103         list_for_each_entry(rentry, &resource_list, node) {
 104                 clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
 105                                               resource_size(rentry->res));
 106                 break;
 107         }
 108
 109         acpi_dev_free_resource_list(&resource_list);
 110
 111         clkdev = platform_device_register_data(&adev->dev, "clk-st",
 112                                                PLATFORM_DEVID_NONE, clk_data,
 113                                                sizeof(*clk_data));
 114         return PTR_ERR_OR_ZERO(clkdev);
 115 }
 116
 117 static const struct apd_device_desc cz_i2c_desc = {
 118         .setup = acpi_apd_setup,
 119         .fixed_clk_rate = 133000000,
 120 };
 121
 122 static const struct apd_device_desc wt_i2c_desc = {
 123         .setup = acpi_apd_setup,
 124         .fixed_clk_rate = 150000000,
 125 };
 126
 127 static struct property_entry uart_properties[] = {
 128         PROPERTY_ENTRY_U32("reg-io-width", 4),
 129         PROPERTY_ENTRY_U32("reg-shift", 2),
 130         PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
 131         { },
 132 };
 133
 134 static const struct apd_device_desc cz_uart_desc = {
 135         .setup = acpi_apd_setup,
 136         .fixed_clk_rate = 48000000,
 137         .properties = uart_properties,
 138 };
 139
 140 static const struct apd_device_desc st_misc_desc = {
 141         .setup = st_misc_setup,
 142 };
 143 #endif
 144
 145 #ifdef CONFIG_ARM64
 146 static const struct apd_device_desc xgene_i2c_desc = {
 147         .setup = acpi_apd_setup,
 148         .fixed_clk_rate = 100000000,
 149 };
 150
 151 static const struct apd_device_desc vulcan_spi_desc = {
 152         .setup = acpi_apd_setup,
 153         .fixed_clk_rate = 133000000,
 154 };
 155
 156 static const struct apd_device_desc hip07_i2c_desc = {
 157         .setup = acpi_apd_setup,
 158         .fixed_clk_rate = 200000000,
 159 };
 160
 161 static const struct apd_device_desc hip08_i2c_desc = {
 162         .setup = acpi_apd_setup,
 163         .fixed_clk_rate = 250000000,
 164 };
 165 static const struct apd_device_desc thunderx2_i2c_desc = {
 166         .setup = acpi_apd_setup,
 167         .fixed_clk_rate = 125000000,
 168 };
 169 #endif
 170
 171 #else
 172
 173 #define APD_ADDR(desc) (0UL)
 174
 175 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
 176
 177 /**
 178 * Create platform device during acpi scan attach handle.
 179 * Return value > 0 on success of creating device.
 180 */
 181 static int acpi_apd_create_device(struct acpi_device *adev,
 182                                    const struct acpi_device_id *id)
 183 {
 184         const struct apd_device_desc *dev_desc = (void *)id->driver_data;
 185         struct apd_private_data *pdata;
 186         struct platform_device *pdev;
 187         int ret;
 188
 189         if (!dev_desc) {
 190                 pdev = acpi_create_platform_device(adev, NULL);
 191                 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
 192         }
 193
 194         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 195         if (!pdata)
 196                 return -ENOMEM;
 197
 198         pdata->adev = adev;
 199         pdata->dev_desc = dev_desc;
 200
 201         if (dev_desc->setup) {
 202                 ret = dev_desc->setup(pdata);
 203                 if (ret)
 204                         goto err_out;
 205         }
 206
 207         adev->driver_data = pdata;
 208         pdev = acpi_create_platform_device(adev, dev_desc->properties);
 209         if (!IS_ERR_OR_NULL(pdev))
 210                 return 1;
 211
 212         ret = PTR_ERR(pdev);
 213         adev->driver_data = NULL;
 214
 215  err_out:
 216         kfree(pdata);
 217         return ret;
 218 }
 219
 220 static const struct acpi_device_id acpi_apd_device_ids[] = {
 221         /* Generic apd devices */
 222 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
 223         { "AMD0010", APD_ADDR(cz_i2c_desc) },
 224         { "AMDI0010", APD_ADDR(wt_i2c_desc) },
 225         { "AMD0020", APD_ADDR(cz_uart_desc) },
 226         { "AMDI0020", APD_ADDR(cz_uart_desc) },
 227         { "AMD0030", },
 228         { "AMD0040", APD_ADDR(st_misc_desc)},
 229 #endif
 230 #ifdef CONFIG_ARM64
 231         { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
 232         { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
 233         { "CAV900D",  APD_ADDR(vulcan_spi_desc) },
 234         { "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
 235         { "HISI02A1", APD_ADDR(hip07_i2c_desc) },
 236         { "HISI02A2", APD_ADDR(hip08_i2c_desc) },
 237 #endif
 238         { }
 239 };
 240
 241 static struct acpi_scan_handler apd_handler = {
 242         .ids = acpi_apd_device_ids,
 243         .attach = acpi_apd_create_device,
 244 };
 245
 246 void __init acpi_apd_init(void)
 247 {
 248         acpi_scan_add_handler(&apd_handler);
 249 }