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         struct property_entry *properties;
  46         int (*setup)(struct apd_private_data *pdata);
  47 };
  48
  49 struct apd_private_data {
  50         struct clk *clk;
  51         struct acpi_device *adev;
  52         const struct apd_device_desc *dev_desc;
  53 };
  54
  55 #if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
  56 #define APD_ADDR(desc)  ((unsigned long)&desc)
  57
  58 static int acpi_apd_setup(struct apd_private_data *pdata)
  59 {
  60         const struct apd_device_desc *dev_desc = pdata->dev_desc;
  61         struct clk *clk = ERR_PTR(-ENODEV);
  62
  63         if (dev_desc->fixed_clk_rate) {
  64                 clk = clk_register_fixed_rate(&pdata->adev->dev,
  65                                         dev_name(&pdata->adev->dev),
  66                                         NULL, 0, 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 const struct apd_device_desc cz_i2c_desc = {
  76         .setup = acpi_apd_setup,
  77         .fixed_clk_rate = 133000000,
  78 };
  79
  80 static const struct apd_device_desc wt_i2c_desc = {
  81         .setup = acpi_apd_setup,
  82         .fixed_clk_rate = 150000000,
  83 };
  84
  85 static struct property_entry uart_properties[] = {
  86         PROPERTY_ENTRY_U32("reg-io-width", 4),
  87         PROPERTY_ENTRY_U32("reg-shift", 2),
  88         PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
  89         { },
  90 };
  91
  92 static const struct apd_device_desc cz_uart_desc = {
  93         .setup = acpi_apd_setup,
  94         .fixed_clk_rate = 48000000,
  95         .properties = uart_properties,
  96 };
  97 #endif
  98
  99 #ifdef CONFIG_ARM64
 100 static const struct apd_device_desc xgene_i2c_desc = {
 101         .setup = acpi_apd_setup,
 102         .fixed_clk_rate = 100000000,
 103 };
 104
 105 static const struct apd_device_desc vulcan_spi_desc = {
 106         .setup = acpi_apd_setup,
 107         .fixed_clk_rate = 133000000,
 108 };
 109 #endif
 110
 111 #else
 112
 113 #define APD_ADDR(desc) (0UL)
 114
 115 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
 116
 117 /**
 118 * Create platform device during acpi scan attach handle.
 119 * Return value > 0 on success of creating device.
 120 */
 121 static int acpi_apd_create_device(struct acpi_device *adev,
 122                                    const struct acpi_device_id *id)
 123 {
 124         const struct apd_device_desc *dev_desc = (void *)id->driver_data;
 125         struct apd_private_data *pdata;
 126         struct platform_device *pdev;
 127         int ret;
 128
 129         if (!dev_desc) {
 130                 pdev = acpi_create_platform_device(adev, NULL);
 131                 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
 132         }
 133
 134         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 135         if (!pdata)
 136                 return -ENOMEM;
 137
 138         pdata->adev = adev;
 139         pdata->dev_desc = dev_desc;
 140
 141         if (dev_desc->setup) {
 142                 ret = dev_desc->setup(pdata);
 143                 if (ret)
 144                         goto err_out;
 145         }
 146
 147         adev->driver_data = pdata;
 148         pdev = acpi_create_platform_device(adev, dev_desc->properties);
 149         if (!IS_ERR_OR_NULL(pdev))
 150                 return 1;
 151
 152         ret = PTR_ERR(pdev);
 153         adev->driver_data = NULL;
 154
 155  err_out:
 156         kfree(pdata);
 157         return ret;
 158 }
 159
 160 static const struct acpi_device_id acpi_apd_device_ids[] = {
 161         /* Generic apd devices */
 162 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
 163         { "AMD0010", APD_ADDR(cz_i2c_desc) },
 164         { "AMDI0010", APD_ADDR(wt_i2c_desc) },
 165         { "AMD0020", APD_ADDR(cz_uart_desc) },
 166         { "AMDI0020", APD_ADDR(cz_uart_desc) },
 167         { "AMD0030", },
 168 #endif
 169 #ifdef CONFIG_ARM64
 170         { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
 171         { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
 172 #endif
 173         { }
 174 };
 175
 176 static struct acpi_scan_handler apd_handler = {
 177         .ids = acpi_apd_device_ids,
 178         .attach = acpi_apd_create_device,
 179 };
 180
 181 void __init acpi_apd_init(void)
 182 {
 183         acpi_scan_add_handler(&apd_handler);
 184 }