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/io.h>
  21 #include <linux/pm.h>
  22
  23 #include "internal.h"
  24
  25 ACPI_MODULE_NAME("acpi_apd");
  26 struct apd_private_data;
  27
  28 /**
  29  * ACPI_APD_SYSFS : add device attributes in sysfs
  30  * ACPI_APD_PM : attach power domain to device
  31  */
  32 #define ACPI_APD_SYSFS  BIT(0)
  33 #define ACPI_APD_PM     BIT(1)
  34
  35 /**
  36  * struct apd_device_desc - a descriptor for apd device
  37  * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
  38  * @fixed_clk_rate: fixed rate input clock source for acpi device;
  39  *                      0 means no fixed rate input clock source
  40  * @setup: a hook routine to set device resource during create platform device
  41  *
  42  * Device description defined as acpi_device_id.driver_data
  43  */
  44 struct apd_device_desc {
  45         unsigned int flags;
  46         unsigned int fixed_clk_rate;
  47         struct property_entry *properties;
  48         int (*setup)(struct apd_private_data *pdata);
  49 };
  50
  51 struct apd_private_data {
  52         struct clk *clk;
  53         struct acpi_device *adev;
  54         const struct apd_device_desc *dev_desc;
  55 };
  56
  57 #if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
  58 #define APD_ADDR(desc)  ((unsigned long)&desc)
  59
  60 static int acpi_apd_setup(struct apd_private_data *pdata)
  61 {
  62         const struct apd_device_desc *dev_desc = pdata->dev_desc;
  63         struct clk *clk = ERR_PTR(-ENODEV);
  64
  65         if (dev_desc->fixed_clk_rate) {
  66                 clk = clk_register_fixed_rate(&pdata->adev->dev,
  67                                         dev_name(&pdata->adev->dev),
  68                                         NULL, 0, dev_desc->fixed_clk_rate);
  69                 clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
  70                 pdata->clk = clk;
  71         }
  72
  73         return 0;
  74 }
  75
  76 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
  77
  78 static int misc_check_res(struct acpi_resource *ares, void *data)
  79 {
  80         struct resource res;
  81
  82         return !acpi_dev_resource_memory(ares, &res);
  83 }
  84
  85 static int st_misc_setup(struct apd_private_data *pdata)
  86 {
  87         struct acpi_device *adev = pdata->adev;
  88         struct platform_device *clkdev;
  89         struct st_clk_data *clk_data;
  90         struct resource_entry *rentry;
  91         struct list_head resource_list;
  92         int ret;
  93
  94         clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
  95         if (!clk_data)
  96                 return -ENOMEM;
  97
  98         INIT_LIST_HEAD(&resource_list);
  99         ret = acpi_dev_get_resources(adev, &resource_list, misc_check_res,
 100                                      NULL);
 101         if (ret < 0)
 102                 return -ENOENT;
 103
 104         list_for_each_entry(rentry, &resource_list, node) {
 105                 clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
 106                                               resource_size(rentry->res));
 107                 break;
 108         }
 109
 110         acpi_dev_free_resource_list(&resource_list);
 111
 112         clkdev = platform_device_register_data(&adev->dev, "clk-st",
 113                                                PLATFORM_DEVID_NONE, clk_data,
 114                                                sizeof(*clk_data));
 115         return PTR_ERR_OR_ZERO(clkdev);
 116 }
 117
 118 static const struct apd_device_desc cz_i2c_desc = {
 119         .setup = acpi_apd_setup,
 120         .fixed_clk_rate = 133000000,
 121 };
 122
 123 static const struct apd_device_desc wt_i2c_desc = {
 124         .setup = acpi_apd_setup,
 125         .fixed_clk_rate = 150000000,
 126 };
 127
 128 static struct property_entry uart_properties[] = {
 129         PROPERTY_ENTRY_U32("reg-io-width", 4),
 130         PROPERTY_ENTRY_U32("reg-shift", 2),
 131         PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
 132         { },
 133 };
 134
 135 static const struct apd_device_desc cz_uart_desc = {
 136         .setup = acpi_apd_setup,
 137         .fixed_clk_rate = 48000000,
 138         .properties = uart_properties,
 139 };
 140
 141 static const struct apd_device_desc st_misc_desc = {
 142         .setup = st_misc_setup,
 143 };
 144 #endif
 145
 146 #ifdef CONFIG_ARM64
 147 static const struct apd_device_desc xgene_i2c_desc = {
 148         .setup = acpi_apd_setup,
 149         .fixed_clk_rate = 100000000,
 150 };
 151
 152 static const struct apd_device_desc vulcan_spi_desc = {
 153         .setup = acpi_apd_setup,
 154         .fixed_clk_rate = 133000000,
 155 };
 156
 157 static const struct apd_device_desc hip07_i2c_desc = {
 158         .setup = acpi_apd_setup,
 159         .fixed_clk_rate = 200000000,
 160 };
 161
 162 static const struct apd_device_desc hip08_i2c_desc = {
 163         .setup = acpi_apd_setup,
 164         .fixed_clk_rate = 250000000,
 165 };
 166 static const struct apd_device_desc thunderx2_i2c_desc = {
 167         .setup = acpi_apd_setup,
 168         .fixed_clk_rate = 125000000,
 169 };
 170
 171 static const struct apd_device_desc hip08_spi_desc = {
 172         .setup = acpi_apd_setup,
 173         .fixed_clk_rate = 250000000,
 174 };
 175 #endif
 176
 177 #else
 178
 179 #define APD_ADDR(desc) (0UL)
 180
 181 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
 182
 183 /**
 184 * Create platform device during acpi scan attach handle.
 185 * Return value > 0 on success of creating device.
 186 */
 187 static int acpi_apd_create_device(struct acpi_device *adev,
 188                                    const struct acpi_device_id *id)
 189 {
 190         const struct apd_device_desc *dev_desc = (void *)id->driver_data;
 191         struct apd_private_data *pdata;
 192         struct platform_device *pdev;
 193         int ret;
 194
 195         if (!dev_desc) {
 196                 pdev = acpi_create_platform_device(adev, NULL);
 197                 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
 198         }
 199
 200         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 201         if (!pdata)
 202                 return -ENOMEM;
 203
 204         pdata->adev = adev;
 205         pdata->dev_desc = dev_desc;
 206
 207         if (dev_desc->setup) {
 208                 ret = dev_desc->setup(pdata);
 209                 if (ret)
 210                         goto err_out;
 211         }
 212
 213         adev->driver_data = pdata;
 214         pdev = acpi_create_platform_device(adev, dev_desc->properties);
 215         if (!IS_ERR_OR_NULL(pdev))
 216                 return 1;
 217
 218         ret = PTR_ERR(pdev);
 219         adev->driver_data = NULL;
 220
 221  err_out:
 222         kfree(pdata);
 223         return ret;
 224 }
 225
 226 static const struct acpi_device_id acpi_apd_device_ids[] = {
 227         /* Generic apd devices */
 228 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
 229         { "AMD0010", APD_ADDR(cz_i2c_desc) },
 230         { "AMDI0010", APD_ADDR(wt_i2c_desc) },
 231         { "AMD0020", APD_ADDR(cz_uart_desc) },
 232         { "AMDI0020", APD_ADDR(cz_uart_desc) },
 233         { "AMD0030", },
 234         { "AMD0040", APD_ADDR(st_misc_desc)},
 235 #endif
 236 #ifdef CONFIG_ARM64
 237         { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
 238         { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
 239         { "CAV900D",  APD_ADDR(vulcan_spi_desc) },
 240         { "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
 241         { "HISI02A1", APD_ADDR(hip07_i2c_desc) },
 242         { "HISI02A2", APD_ADDR(hip08_i2c_desc) },
 243         { "HISI0173", APD_ADDR(hip08_spi_desc) },
 244 #endif
 245         { }
 246 };
 247
 248 static struct acpi_scan_handler apd_handler = {
 249         .ids = acpi_apd_device_ids,
 250         .attach = acpi_apd_create_device,
 251 };
 252
 253 void __init acpi_apd_init(void)
 254 {
 255         acpi_scan_add_handler(&apd_handler);
 256 }