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 } 166