drivers/acpi/acpi_apd.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * AMD ACPI support for ACPI2platform device.
   4  *
   5  * Copyright (c) 2014,2015 AMD Corporation.
   6  * Authors: Ken Xue <Ken.Xue@amd.com>
   7  *      Wu, Jeff <Jeff.Wu@amd.com>
   8  */
   9
  10 #include <linux/clk-provider.h>
  11 #include <linux/platform_data/clk-fch.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/pm_domain.h>
  14 #include <linux/clkdev.h>
  15 #include <linux/acpi.h>
  16 #include <linux/err.h>
  17 #include <linux/io.h>
  18 #include <linux/pm.h>
  19
  20 #include "internal.h"
  21
  22 ACPI_MODULE_NAME("acpi_apd");
  23 struct apd_private_data;
  24
  25 /**
  26  * ACPI_APD_SYSFS : add device attributes in sysfs
  27  * ACPI_APD_PM : attach power domain to device
  28  */
  29 #define ACPI_APD_SYSFS  BIT(0)
  30 #define ACPI_APD_PM     BIT(1)
  31
  32 /**
  33  * struct apd_device_desc - a descriptor for apd device
  34  * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
  35  * @fixed_clk_rate: fixed rate input clock source for acpi device;
  36  *                      0 means no fixed rate input clock source
  37  * @setup: a hook routine to set device resource during create platform device
  38  *
  39  * Device description defined as acpi_device_id.driver_data
  40  */
  41 struct apd_device_desc {
  42         unsigned int flags;
  43         unsigned int fixed_clk_rate;
  44         struct property_entry *properties;
  45         int (*setup)(struct apd_private_data *pdata);
  46 };
  47
  48 struct apd_private_data {
  49         struct clk *clk;
  50         struct acpi_device *adev;
  51         const struct apd_device_desc *dev_desc;
  52 };
  53
  54 #if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
  55 #define APD_ADDR(desc)  ((unsigned long)&desc)
  56
  57 static int acpi_apd_setup(struct apd_private_data *pdata)
  58 {
  59         const struct apd_device_desc *dev_desc = pdata->dev_desc;
  60         struct clk *clk;
  61
  62         if (dev_desc->fixed_clk_rate) {
  63                 clk = clk_register_fixed_rate(&pdata->adev->dev,
  64                                         dev_name(&pdata->adev->dev),
  65                                         NULL, 0, dev_desc->fixed_clk_rate);
  66                 clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
  67                 pdata->clk = clk;
  68         }
  69
  70         return 0;
  71 }
  72
  73 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
  74
  75 static int misc_check_res(struct acpi_resource *ares, void *data)
  76 {
  77         struct resource res;
  78
  79         return !acpi_dev_resource_memory(ares, &res);
  80 }
  81
  82 static int fch_misc_setup(struct apd_private_data *pdata)
  83 {
  84         struct acpi_device *adev = pdata->adev;
  85         const union acpi_object *obj;
  86         struct platform_device *clkdev;
  87         struct fch_clk_data *clk_data;
  88         struct resource_entry *rentry;
  89         struct list_head resource_list;
  90         int ret;
  91
  92         clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
  93         if (!clk_data)
  94                 return -ENOMEM;
  95
  96         INIT_LIST_HEAD(&resource_list);
  97         ret = acpi_dev_get_resources(adev, &resource_list, misc_check_res,
  98                                      NULL);
  99         if (ret < 0)
 100                 return -ENOENT;
 101
 102         if (!acpi_dev_get_property(adev, "is-rv", ACPI_TYPE_INTEGER, &obj))
 103                 clk_data->is_rv = obj->integer.value;
 104
 105         list_for_each_entry(rentry, &resource_list, node) {
 106                 clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
 107                                               resource_size(rentry->res));
 108                 break;
 109         }
 110
 111         acpi_dev_free_resource_list(&resource_list);
 112
 113         clkdev = platform_device_register_data(&adev->dev, "clk-fch",
 114                                                PLATFORM_DEVID_NONE, clk_data,
 115                                                sizeof(*clk_data));
 116         return PTR_ERR_OR_ZERO(clkdev);
 117 }
 118
 119 static const struct apd_device_desc cz_i2c_desc = {
 120         .setup = acpi_apd_setup,
 121         .fixed_clk_rate = 133000000,
 122 };
 123
 124 static const struct apd_device_desc wt_i2c_desc = {
 125         .setup = acpi_apd_setup,
 126         .fixed_clk_rate = 150000000,
 127 };
 128
 129 static struct property_entry uart_properties[] = {
 130         PROPERTY_ENTRY_U32("reg-io-width", 4),
 131         PROPERTY_ENTRY_U32("reg-shift", 2),
 132         PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
 133         { },
 134 };
 135
 136 static const struct apd_device_desc cz_uart_desc = {
 137         .setup = acpi_apd_setup,
 138         .fixed_clk_rate = 48000000,
 139         .properties = uart_properties,
 140 };
 141
 142 static const struct apd_device_desc fch_misc_desc = {
 143         .setup = fch_misc_setup,
 144 };
 145 #endif
 146
 147 #ifdef CONFIG_ARM64
 148 static const struct apd_device_desc xgene_i2c_desc = {
 149         .setup = acpi_apd_setup,
 150         .fixed_clk_rate = 100000000,
 151 };
 152
 153 static const struct apd_device_desc vulcan_spi_desc = {
 154         .setup = acpi_apd_setup,
 155         .fixed_clk_rate = 133000000,
 156 };
 157
 158 static const struct apd_device_desc hip07_i2c_desc = {
 159         .setup = acpi_apd_setup,
 160         .fixed_clk_rate = 200000000,
 161 };
 162
 163 static const struct apd_device_desc hip08_i2c_desc = {
 164         .setup = acpi_apd_setup,
 165         .fixed_clk_rate = 250000000,
 166 };
 167
 168 static const struct apd_device_desc hip08_lite_i2c_desc = {
 169         .setup = acpi_apd_setup,
 170         .fixed_clk_rate = 125000000,
 171 };
 172
 173 static const struct apd_device_desc thunderx2_i2c_desc = {
 174         .setup = acpi_apd_setup,
 175         .fixed_clk_rate = 125000000,
 176 };
 177
 178 static const struct apd_device_desc nxp_i2c_desc = {
 179         .setup = acpi_apd_setup,
 180         .fixed_clk_rate = 350000000,
 181 };
 182
 183 static const struct apd_device_desc hip08_spi_desc = {
 184         .setup = acpi_apd_setup,
 185         .fixed_clk_rate = 250000000,
 186 };
 187 #endif
 188
 189 #else
 190
 191 #define APD_ADDR(desc) (0UL)
 192
 193 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
 194
 195 /**
 196 * Create platform device during acpi scan attach handle.
 197 * Return value > 0 on success of creating device.
 198 */
 199 static int acpi_apd_create_device(struct acpi_device *adev,
 200                                    const struct acpi_device_id *id)
 201 {
 202         const struct apd_device_desc *dev_desc = (void *)id->driver_data;
 203         struct apd_private_data *pdata;
 204         struct platform_device *pdev;
 205         int ret;
 206
 207         if (!dev_desc) {
 208                 pdev = acpi_create_platform_device(adev, NULL);
 209                 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
 210         }
 211
 212         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 213         if (!pdata)
 214                 return -ENOMEM;
 215
 216         pdata->adev = adev;
 217         pdata->dev_desc = dev_desc;
 218
 219         if (dev_desc->setup) {
 220                 ret = dev_desc->setup(pdata);
 221                 if (ret)
 222                         goto err_out;
 223         }
 224
 225         adev->driver_data = pdata;
 226         pdev = acpi_create_platform_device(adev, dev_desc->properties);
 227         if (!IS_ERR_OR_NULL(pdev))
 228                 return 1;
 229
 230         ret = PTR_ERR(pdev);
 231         adev->driver_data = NULL;
 232
 233  err_out:
 234         kfree(pdata);
 235         return ret;
 236 }
 237
 238 static const struct acpi_device_id acpi_apd_device_ids[] = {
 239         /* Generic apd devices */
 240 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
 241         { "AMD0010", APD_ADDR(cz_i2c_desc) },
 242         { "AMDI0010", APD_ADDR(wt_i2c_desc) },
 243         { "AMD0020", APD_ADDR(cz_uart_desc) },
 244         { "AMDI0020", APD_ADDR(cz_uart_desc) },
 245         { "AMD0030", },
 246         { "AMD0040", APD_ADDR(fch_misc_desc)},
 247         { "HYGO0010", APD_ADDR(wt_i2c_desc) },
 248 #endif
 249 #ifdef CONFIG_ARM64
 250         { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
 251         { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
 252         { "CAV900D",  APD_ADDR(vulcan_spi_desc) },
 253         { "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
 254         { "HISI02A1", APD_ADDR(hip07_i2c_desc) },
 255         { "HISI02A2", APD_ADDR(hip08_i2c_desc) },
 256         { "HISI02A3", APD_ADDR(hip08_lite_i2c_desc) },
 257         { "HISI0173", APD_ADDR(hip08_spi_desc) },
 258         { "NXP0001", APD_ADDR(nxp_i2c_desc) },
 259 #endif
 260         { }
 261 };
 262
 263 static struct acpi_scan_handler apd_handler = {
 264         .ids = acpi_apd_device_ids,
 265         .attach = acpi_apd_create_device,
 266 };
 267
 268 void __init acpi_apd_init(void)
 269 {
 270         acpi_scan_add_handler(&apd_handler);
 271 }