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, 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 static struct apd_device_desc cz_i2c_desc = { 75 .setup = acpi_apd_setup, 76 .fixed_clk_rate = 133000000, 77 }; 78 79 static struct apd_device_desc cz_uart_desc = { 80 .setup = acpi_apd_setup, 81 .fixed_clk_rate = 48000000, 82 }; 83 #endif 84 85 #ifdef CONFIG_ARM64 86 static struct apd_device_desc xgene_i2c_desc = { 87 .setup = acpi_apd_setup, 88 .fixed_clk_rate = 100000000, 89 }; 90 #endif 91 92 #else 93 94 #define APD_ADDR(desc) (0UL) 95 96 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */ 97 98 /** 99 * Create platform device during acpi scan attach handle. 100 * Return value > 0 on success of creating device. 101 */ 102 static int acpi_apd_create_device(struct acpi_device *adev, 103 const struct acpi_device_id *id) 104 { 105 const struct apd_device_desc *dev_desc = (void *)id->driver_data; 106 struct apd_private_data *pdata; 107 struct platform_device *pdev; 108 int ret; 109 110 if (!dev_desc) { 111 pdev = acpi_create_platform_device(adev); 112 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1; 113 } 114 115 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); 116 if (!pdata) 117 return -ENOMEM; 118 119 pdata->adev = adev; 120 pdata->dev_desc = dev_desc; 121 122 if (dev_desc->setup) { 123 ret = dev_desc->setup(pdata); 124 if (ret) 125 goto err_out; 126 } 127 128 adev->driver_data = pdata; 129 pdev = acpi_create_platform_device(adev); 130 if (!IS_ERR_OR_NULL(pdev)) 131 return 1; 132 133 ret = PTR_ERR(pdev); 134 adev->driver_data = NULL; 135 136 err_out: 137 kfree(pdata); 138 return ret; 139 } 140 141 static const struct acpi_device_id acpi_apd_device_ids[] = { 142 /* Generic apd devices */ 143 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE 144 { "AMD0010", APD_ADDR(cz_i2c_desc) }, 145 { "AMDI0010", APD_ADDR(cz_i2c_desc) }, 146 { "AMD0020", APD_ADDR(cz_uart_desc) }, 147 { "AMDI0020", APD_ADDR(cz_uart_desc) }, 148 { "AMD0030", }, 149 #endif 150 #ifdef CONFIG_ARM64 151 { "APMC0D0F", APD_ADDR(xgene_i2c_desc) }, 152 #endif 153 { } 154 }; 155 156 static struct acpi_scan_handler apd_handler = { 157 .ids = acpi_apd_device_ids, 158 .attach = acpi_apd_create_device, 159 }; 160 161 void __init acpi_apd_init(void) 162 { 163 acpi_scan_add_handler(&apd_handler); 164 } 165