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-st.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 st_misc_setup(struct apd_private_data *pdata)
  83 {
  84         struct acpi_device *adev = pdata->adev;
  85         struct platform_device *clkdev;
  86         struct st_clk_data *clk_data;
  87         struct resource_entry *rentry;
  88         struct list_head resource_list;
  89         int ret;
  90
  91         clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
  92         if (!clk_data)
  93                 return -ENOMEM;
  94
  95         INIT_LIST_HEAD(&resource_list);
  96         ret = acpi_dev_get_resources(adev, &resource_list, misc_check_res,
  97                                      NULL);
  98         if (ret < 0)
  99                 return -ENOENT;
 100
 101         list_for_each_entry(rentry, &resource_list, node) {
 102                 clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
 103                                               resource_size(rentry->res));
 104                 break;
 105         }
 106
 107         acpi_dev_free_resource_list(&resource_list);
 108
 109         clkdev = platform_device_register_data(&adev->dev, "clk-st",
 110                                                PLATFORM_DEVID_NONE, clk_data,
 111                                                sizeof(*clk_data));
 112         return PTR_ERR_OR_ZERO(clkdev);
 113 }
 114
 115 static const struct apd_device_desc cz_i2c_desc = {
 116         .setup = acpi_apd_setup,
 117         .fixed_clk_rate = 133000000,
 118 };
 119
 120 static const struct apd_device_desc wt_i2c_desc = {
 121         .setup = acpi_apd_setup,
 122         .fixed_clk_rate = 150000000,
 123 };
 124
 125 static struct property_entry uart_properties[] = {
 126         PROPERTY_ENTRY_U32("reg-io-width", 4),
 127         PROPERTY_ENTRY_U32("reg-shift", 2),
 128         PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
 129         { },
 130 };
 131
 132 static const struct apd_device_desc cz_uart_desc = {
 133         .setup = acpi_apd_setup,
 134         .fixed_clk_rate = 48000000,
 135         .properties = uart_properties,
 136 };
 137
 138 static const struct apd_device_desc st_misc_desc = {
 139         .setup = st_misc_setup,
 140 };
 141 #endif
 142
 143 #ifdef CONFIG_ARM64
 144 static const struct apd_device_desc xgene_i2c_desc = {
 145         .setup = acpi_apd_setup,
 146         .fixed_clk_rate = 100000000,
 147 };
 148
 149 static const struct apd_device_desc vulcan_spi_desc = {
 150         .setup = acpi_apd_setup,
 151         .fixed_clk_rate = 133000000,
 152 };
 153
 154 static const struct apd_device_desc hip07_i2c_desc = {
 155         .setup = acpi_apd_setup,
 156         .fixed_clk_rate = 200000000,
 157 };
 158
 159 static const struct apd_device_desc hip08_i2c_desc = {
 160         .setup = acpi_apd_setup,
 161         .fixed_clk_rate = 250000000,
 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 hip08_spi_desc = {
 169         .setup = acpi_apd_setup,
 170         .fixed_clk_rate = 250000000,
 171 };
 172 #endif
 173
 174 #else
 175
 176 #define APD_ADDR(desc) (0UL)
 177
 178 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
 179
 180 /**
 181 * Create platform device during acpi scan attach handle.
 182 * Return value > 0 on success of creating device.
 183 */
 184 static int acpi_apd_create_device(struct acpi_device *adev,
 185                                    const struct acpi_device_id *id)
 186 {
 187         const struct apd_device_desc *dev_desc = (void *)id->driver_data;
 188         struct apd_private_data *pdata;
 189         struct platform_device *pdev;
 190         int ret;
 191
 192         if (!dev_desc) {
 193                 pdev = acpi_create_platform_device(adev, NULL);
 194                 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
 195         }
 196
 197         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 198         if (!pdata)
 199                 return -ENOMEM;
 200
 201         pdata->adev = adev;
 202         pdata->dev_desc = dev_desc;
 203
 204         if (dev_desc->setup) {
 205                 ret = dev_desc->setup(pdata);
 206                 if (ret)
 207                         goto err_out;
 208         }
 209
 210         adev->driver_data = pdata;
 211         pdev = acpi_create_platform_device(adev, dev_desc->properties);
 212         if (!IS_ERR_OR_NULL(pdev))
 213                 return 1;
 214
 215         ret = PTR_ERR(pdev);
 216         adev->driver_data = NULL;
 217
 218  err_out:
 219         kfree(pdata);
 220         return ret;
 221 }
 222
 223 static const struct acpi_device_id acpi_apd_device_ids[] = {
 224         /* Generic apd devices */
 225 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
 226         { "AMD0010", APD_ADDR(cz_i2c_desc) },
 227         { "AMDI0010", APD_ADDR(wt_i2c_desc) },
 228         { "AMD0020", APD_ADDR(cz_uart_desc) },
 229         { "AMDI0020", APD_ADDR(cz_uart_desc) },
 230         { "AMD0030", },
 231         { "AMD0040", APD_ADDR(st_misc_desc)},
 232 #endif
 233 #ifdef CONFIG_ARM64
 234         { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
 235         { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
 236         { "CAV900D",  APD_ADDR(vulcan_spi_desc) },
 237         { "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
 238         { "HISI02A1", APD_ADDR(hip07_i2c_desc) },
 239         { "HISI02A2", APD_ADDR(hip08_i2c_desc) },
 240         { "HISI0173", APD_ADDR(hip08_spi_desc) },
 241 #endif
 242         { }
 243 };
 244
 245 static struct acpi_scan_handler apd_handler = {
 246         .ids = acpi_apd_device_ids,
 247         .attach = acpi_apd_create_device,
 248 };
 249
 250 void __init acpi_apd_init(void)
 251 {
 252         acpi_scan_add_handler(&apd_handler);
 253 }