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                 if (!clk_data->name)
  87                         return -ENOMEM;
  88
  89                 strcpy(clk_data->name, obj->string.pointer);
  90         } else {
  91                 /* Set default name to mclk if entry missing in firmware */
  92                 clk_data->name = "mclk";
  93         }
  94
  95         list_for_each_entry(rentry, &resource_list, node) {
  96                 clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
  97                                               resource_size(rentry->res));
  98                 break;
  99         }
 100         if (!clk_data->base)
 101                 return -ENOMEM;
 102
 103         acpi_dev_free_resource_list(&resource_list);
 104
 105         clkdev = platform_device_register_data(&adev->dev, "clk-fch",
 106                                                PLATFORM_DEVID_NONE, clk_data,
 107                                                sizeof(*clk_data));
 108         return PTR_ERR_OR_ZERO(clkdev);
 109 }
 110
 111 static const struct apd_device_desc cz_i2c_desc = {
 112         .setup = acpi_apd_setup,
 113         .fixed_clk_rate = 133000000,
 114 };
 115
 116 static const struct apd_device_desc wt_i2c_desc = {
 117         .setup = acpi_apd_setup,
 118         .fixed_clk_rate = 150000000,
 119 };
 120
 121 static struct property_entry uart_properties[] = {
 122         PROPERTY_ENTRY_U32("reg-io-width", 4),
 123         PROPERTY_ENTRY_U32("reg-shift", 2),
 124         PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
 125         { },
 126 };
 127
 128 static const struct apd_device_desc cz_uart_desc = {
 129         .setup = acpi_apd_setup,
 130         .fixed_clk_rate = 48000000,
 131         .properties = uart_properties,
 132 };
 133
 134 static const struct apd_device_desc fch_misc_desc = {
 135         .setup = fch_misc_setup,
 136 };
 137 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
 138
 139 #ifdef CONFIG_ARM64
 140 static const struct apd_device_desc xgene_i2c_desc = {
 141         .setup = acpi_apd_setup,
 142         .fixed_clk_rate = 100000000,
 143 };
 144
 145 static const struct apd_device_desc vulcan_spi_desc = {
 146         .setup = acpi_apd_setup,
 147         .fixed_clk_rate = 133000000,
 148 };
 149
 150 static const struct apd_device_desc hip07_i2c_desc = {
 151         .setup = acpi_apd_setup,
 152         .fixed_clk_rate = 200000000,
 153 };
 154
 155 static const struct apd_device_desc hip08_i2c_desc = {
 156         .setup = acpi_apd_setup,
 157         .fixed_clk_rate = 250000000,
 158 };
 159
 160 static const struct apd_device_desc hip08_lite_i2c_desc = {
 161         .setup = acpi_apd_setup,
 162         .fixed_clk_rate = 125000000,
 163 };
 164
 165 static const struct apd_device_desc thunderx2_i2c_desc = {
 166         .setup = acpi_apd_setup,
 167         .fixed_clk_rate = 125000000,
 168 };
 169
 170 static const struct apd_device_desc nxp_i2c_desc = {
 171         .setup = acpi_apd_setup,
 172         .fixed_clk_rate = 350000000,
 173 };
 174
 175 static const struct apd_device_desc hip08_spi_desc = {
 176         .setup = acpi_apd_setup,
 177         .fixed_clk_rate = 250000000,
 178 };
 179 #endif /* CONFIG_ARM64 */
 180
 181 #endif
 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         { "AMD0020", APD_ADDR(cz_uart_desc) },
 231         { "AMD0030", },
 232         { "AMD0040", APD_ADDR(fch_misc_desc)},
 233         { "AMDI0010", APD_ADDR(wt_i2c_desc) },
 234         { "AMDI0019", APD_ADDR(wt_i2c_desc) },
 235         { "AMDI0020", APD_ADDR(cz_uart_desc) },
 236         { "AMDI0022", APD_ADDR(cz_uart_desc) },
 237         { "HYGO0010", APD_ADDR(wt_i2c_desc) },
 238 #endif
 239 #ifdef CONFIG_ARM64
 240         { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
 241         { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
 242         { "CAV900D",  APD_ADDR(vulcan_spi_desc) },
 243         { "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
 244         { "HISI02A1", APD_ADDR(hip07_i2c_desc) },
 245         { "HISI02A2", APD_ADDR(hip08_i2c_desc) },
 246         { "HISI02A3", APD_ADDR(hip08_lite_i2c_desc) },
 247         { "HISI0173", APD_ADDR(hip08_spi_desc) },
 248         { "NXP0001", APD_ADDR(nxp_i2c_desc) },
 249 #endif
 250         { }
 251 };
 252
 253 static struct acpi_scan_handler apd_handler = {
 254         .ids = acpi_apd_device_ids,
 255         .attach = acpi_apd_create_device,
 256 };
 257
 258 void __init acpi_apd_init(void)
 259 {
 260         acpi_scan_add_handler(&apd_handler);
 261 }