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_device.h>
  15 #include <linux/pm_domain.h>
  16 #include <linux/clkdev.h>
  17 #include <linux/acpi.h>
  18 #include <linux/err.h>
  19 #include <linux/pm.h>
  20
  21 #include "internal.h"
  22
  23 ACPI_MODULE_NAME("acpi_apd");
  24 struct apd_private_data;
  25
  26 /**
  27  * ACPI_APD_SYSFS : add device attributes in sysfs
  28  * ACPI_APD_PM : attach power domain to device
  29  */
  30 #define ACPI_APD_SYSFS  BIT(0)
  31 #define ACPI_APD_PM     BIT(1)
  32
  33 /**
  34  * struct apd_device_desc - a descriptor for apd device
  35  * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
  36  * @fixed_clk_rate: fixed rate input clock source for acpi device;
  37  *                      0 means no fixed rate input clock source
  38  * @setup: a hook routine to set device resource during create platform device
  39  *
  40  * Device description defined as acpi_device_id.driver_data
  41  */
  42 struct apd_device_desc {
  43         unsigned int flags;
  44         unsigned int fixed_clk_rate;
  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 = ERR_PTR(-ENODEV);
  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, CLK_IS_ROOT,
  66                                         dev_desc->fixed_clk_rate);
  67                 clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
  68                 pdata->clk = clk;
  69         }
  70
  71         return 0;
  72 }
  73
  74 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
  75 static struct apd_device_desc cz_i2c_desc = {
  76         .setup = acpi_apd_setup,
  77         .fixed_clk_rate = 133000000,
  78 };
  79
  80 static struct apd_device_desc cz_uart_desc = {
  81         .setup = acpi_apd_setup,
  82         .fixed_clk_rate = 48000000,
  83 };
  84 #endif
  85
  86 #ifdef CONFIG_ARM64
  87 static struct apd_device_desc xgene_i2c_desc = {
  88         .setup = acpi_apd_setup,
  89         .fixed_clk_rate = 100000000,
  90 };
  91 #endif
  92
  93 #else
  94
  95 #define APD_ADDR(desc) (0UL)
  96
  97 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
  98
  99 /**
 100 * Create platform device during acpi scan attach handle.
 101 * Return value > 0 on success of creating device.
 102 */
 103 static int acpi_apd_create_device(struct acpi_device *adev,
 104                                    const struct acpi_device_id *id)
 105 {
 106         const struct apd_device_desc *dev_desc = (void *)id->driver_data;
 107         struct apd_private_data *pdata;
 108         struct platform_device *pdev;
 109         int ret;
 110
 111         if (!dev_desc) {
 112                 pdev = acpi_create_platform_device(adev);
 113                 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
 114         }
 115
 116         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 117         if (!pdata)
 118                 return -ENOMEM;
 119
 120         pdata->adev = adev;
 121         pdata->dev_desc = dev_desc;
 122
 123         if (dev_desc->setup) {
 124                 ret = dev_desc->setup(pdata);
 125                 if (ret)
 126                         goto err_out;
 127         }
 128
 129         adev->driver_data = pdata;
 130         pdev = acpi_create_platform_device(adev);
 131         if (!IS_ERR_OR_NULL(pdev))
 132                 return 1;
 133
 134         ret = PTR_ERR(pdev);
 135         adev->driver_data = NULL;
 136
 137  err_out:
 138         kfree(pdata);
 139         return ret;
 140 }
 141
 142 static const struct acpi_device_id acpi_apd_device_ids[] = {
 143         /* Generic apd devices */
 144 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
 145         { "AMD0010", APD_ADDR(cz_i2c_desc) },
 146         { "AMDI0010", APD_ADDR(cz_i2c_desc) },
 147         { "AMD0020", APD_ADDR(cz_uart_desc) },
 148         { "AMDI0020", APD_ADDR(cz_uart_desc) },
 149         { "AMD0030", },
 150 #endif
 151 #ifdef CONFIG_ARM64
 152         { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
 153 #endif
 154         { }
 155 };
 156
 157 static struct acpi_scan_handler apd_handler = {
 158         .ids = acpi_apd_device_ids,
 159         .attach = acpi_apd_create_device,
 160 };
 161
 162 void __init acpi_apd_init(void)
 163 {
 164         acpi_scan_add_handler(&apd_handler);
 165 }