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/acpi.h>
  11 #include <linux/clkdev.h>
  12 #include <linux/clk-provider.h>
  13 #include <linux/err.h>
  14 #include <linux/io.h>
  15 #include <linux/platform_data/clk-fch.h>
  16 #include <linux/platform_device.h>
  17
  18 #include "internal.h"
  19
  20 struct apd_private_data;
  21
  22 /**
  23  * struct apd_device_desc - a descriptor for apd device
  24  * @fixed_clk_rate: fixed rate input clock source for acpi device;
  25  *                      0 means no fixed rate input clock source
  26  * @properties: build-in properties of the device such as UART
  27  * @setup: a hook routine to set device resource during create platform device
  28  *
  29  * Device description defined as acpi_device_id.driver_data
  30  */
  31 struct apd_device_desc {
  32         unsigned int fixed_clk_rate;
  33         struct property_entry *properties;
  34         int (*setup)(struct apd_private_data *pdata);
  35 };
  36
  37 struct apd_private_data {
  38         struct clk *clk;
  39         struct acpi_device *adev;
  40         const struct apd_device_desc *dev_desc;
  41 };
  42
  43 #if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
  44 #define APD_ADDR(desc)  ((unsigned long)&desc)
  45
  46 static int acpi_apd_setup(struct apd_private_data *pdata)
  47 {
  48         const struct apd_device_desc *dev_desc = pdata->dev_desc;
  49         struct clk *clk;
  50
  51         if (dev_desc->fixed_clk_rate) {
  52                 clk = clk_register_fixed_rate(&pdata->adev->dev,
  53                                         dev_name(&pdata->adev->dev),
  54                                         NULL, 0, dev_desc->fixed_clk_rate);
  55                 clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
  56                 pdata->clk = clk;
  57         }
  58
  59         return 0;
  60 }
  61
  62 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
  63
  64 static int fch_misc_setup(struct apd_private_data *pdata)
  65 {
  66         struct acpi_device *adev = pdata->adev;
  67         const union acpi_object *obj;
  68         struct platform_device *clkdev;
  69         struct fch_clk_data *clk_data;
  70         struct resource_entry *rentry;
  71         struct list_head resource_list;
  72         int ret;
  73
  74         clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
  75         if (!clk_data)
  76                 return -ENOMEM;
  77
  78         INIT_LIST_HEAD(&resource_list);
  79         ret = acpi_dev_get_memory_resources(adev, &resource_list);
  80         if (ret < 0)
  81                 return -ENOENT;
  82
  83         if (!acpi_dev_get_property(adev, "clk-name", ACPI_TYPE_STRING, &obj)) {
  84                 clk_data->name = devm_kzalloc(&adev->dev, obj->string.length,
  85                                               GFP_KERNEL);
  86
  87                 strcpy(clk_data->name, obj->string.pointer);
  88         } else {
  89                 /* Set default name to mclk if entry missing in firmware */
  90                 clk_data->name = "mclk";
  91         }
  92
  93         list_for_each_entry(rentry, &resource_list, node) {
  94                 clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
  95                                               resource_size(rentry->res));
  96                 break;
  97         }
  98         if (!clk_data->base)
  99                 return -ENOMEM;
 100
 101         acpi_dev_free_resource_list(&resource_list);
 102
 103         clkdev = platform_device_register_data(&adev->dev, "clk-fch",
 104                                                PLATFORM_DEVID_NONE, clk_data,
 105                                                sizeof(*clk_data));
 106         return PTR_ERR_OR_ZERO(clkdev);
 107 }
 108
 109 static const struct apd_device_desc cz_i2c_desc = {
 110         .setup = acpi_apd_setup,
 111         .fixed_clk_rate = 133000000,
 112 };
 113
 114 static const struct apd_device_desc wt_i2c_desc = {
 115         .setup = acpi_apd_setup,
 116         .fixed_clk_rate = 150000000,
 117 };
 118
 119 static struct property_entry uart_properties[] = {
 120         PROPERTY_ENTRY_U32("reg-io-width", 4),
 121         PROPERTY_ENTRY_U32("reg-shift", 2),
 122         PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
 123         { },
 124 };
 125
 126 static const struct apd_device_desc cz_uart_desc = {
 127         .setup = acpi_apd_setup,
 128         .fixed_clk_rate = 48000000,
 129         .properties = uart_properties,
 130 };
 131
 132 static const struct apd_device_desc fch_misc_desc = {
 133         .setup = fch_misc_setup,
 134 };
 135 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
 136
 137 #ifdef CONFIG_ARM64
 138 static const struct apd_device_desc xgene_i2c_desc = {
 139         .setup = acpi_apd_setup,
 140         .fixed_clk_rate = 100000000,
 141 };
 142
 143 static const struct apd_device_desc vulcan_spi_desc = {
 144         .setup = acpi_apd_setup,
 145         .fixed_clk_rate = 133000000,
 146 };
 147
 148 static const struct apd_device_desc hip07_i2c_desc = {
 149         .setup = acpi_apd_setup,
 150         .fixed_clk_rate = 200000000,
 151 };
 152
 153 static const struct apd_device_desc hip08_i2c_desc = {
 154         .setup = acpi_apd_setup,
 155         .fixed_clk_rate = 250000000,
 156 };
 157
 158 static const struct apd_device_desc hip08_lite_i2c_desc = {
 159         .setup = acpi_apd_setup,
 160         .fixed_clk_rate = 125000000,
 161 };
 162
 163 static const struct apd_device_desc thunderx2_i2c_desc = {
 164         .setup = acpi_apd_setup,
 165         .fixed_clk_rate = 125000000,
 166 };
 167
 168 static const struct apd_device_desc nxp_i2c_desc = {
 169         .setup = acpi_apd_setup,
 170         .fixed_clk_rate = 350000000,
 171 };
 172
 173 static const struct apd_device_desc hip08_spi_desc = {
 174         .setup = acpi_apd_setup,
 175         .fixed_clk_rate = 250000000,
 176 };
 177 #endif /* CONFIG_ARM64 */
 178
 179 #endif
 180
 181 /*
 182  * Create platform device during acpi scan attach handle.
 183  * Return value > 0 on success of creating device.
 184  */
 185 static int acpi_apd_create_device(struct acpi_device *adev,
 186                                    const struct acpi_device_id *id)
 187 {
 188         const struct apd_device_desc *dev_desc = (void *)id->driver_data;
 189         struct apd_private_data *pdata;
 190         struct platform_device *pdev;
 191         int ret;
 192
 193         if (!dev_desc) {
 194                 pdev = acpi_create_platform_device(adev, NULL);
 195                 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
 196         }
 197
 198         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 199         if (!pdata)
 200                 return -ENOMEM;
 201
 202         pdata->adev = adev;
 203         pdata->dev_desc = dev_desc;
 204
 205         if (dev_desc->setup) {
 206                 ret = dev_desc->setup(pdata);
 207                 if (ret)
 208                         goto err_out;
 209         }
 210
 211         adev->driver_data = pdata;
 212         pdev = acpi_create_platform_device(adev, dev_desc->properties);
 213         if (!IS_ERR_OR_NULL(pdev))
 214                 return 1;
 215
 216         ret = PTR_ERR(pdev);
 217         adev->driver_data = NULL;
 218
 219  err_out:
 220         kfree(pdata);
 221         return ret;
 222 }
 223
 224 static const struct acpi_device_id acpi_apd_device_ids[] = {
 225         /* Generic apd devices */
 226 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
 227         { "AMD0010", APD_ADDR(cz_i2c_desc) },
 228         { "AMD0020", APD_ADDR(cz_uart_desc) },
 229         { "AMD0030", },
 230         { "AMD0040", APD_ADDR(fch_misc_desc)},
 231         { "AMDI0010", APD_ADDR(wt_i2c_desc) },
 232         { "AMDI0019", APD_ADDR(wt_i2c_desc) },
 233         { "AMDI0020", APD_ADDR(cz_uart_desc) },
 234         { "AMDI0022", APD_ADDR(cz_uart_desc) },
 235         { "HYGO0010", APD_ADDR(wt_i2c_desc) },
 236 #endif
 237 #ifdef CONFIG_ARM64
 238         { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
 239         { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
 240         { "CAV900D",  APD_ADDR(vulcan_spi_desc) },
 241         { "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
 242         { "HISI02A1", APD_ADDR(hip07_i2c_desc) },
 243         { "HISI02A2", APD_ADDR(hip08_i2c_desc) },
 244         { "HISI02A3", APD_ADDR(hip08_lite_i2c_desc) },
 245         { "HISI0173", APD_ADDR(hip08_spi_desc) },
 246         { "NXP0001", APD_ADDR(nxp_i2c_desc) },
 247 #endif
 248         { }
 249 };
 250
 251 static struct acpi_scan_handler apd_handler = {
 252         .ids = acpi_apd_device_ids,
 253         .attach = acpi_apd_create_device,
 254 };
 255
 256 void __init acpi_apd_init(void)
 257 {
 258         acpi_scan_add_handler(&apd_handler);
 259 }