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 struct property_entry uart_properties[] = { 81 PROPERTY_ENTRY_U32("reg-io-width", 4), 82 PROPERTY_ENTRY_U32("reg-shift", 2), 83 PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"), 84 { }, 85 }; 86 87 static const struct apd_device_desc cz_uart_desc = { 88 .setup = acpi_apd_setup, 89 .fixed_clk_rate = 48000000, 90 .properties = uart_properties, 91 }; 92 #endif 93 94 #ifdef CONFIG_ARM64 95 static const struct apd_device_desc xgene_i2c_desc = { 96 .setup = acpi_apd_setup, 97 .fixed_clk_rate = 100000000, 98 }; 99 100 static const struct apd_device_desc vulcan_spi_desc = { 101 .setup = acpi_apd_setup, 102 .fixed_clk_rate = 133000000, 103 }; 104 #endif 105 106 #else 107 108 #define APD_ADDR(desc) (0UL) 109 110 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */ 111 112 /** 113 * Create platform device during acpi scan attach handle. 114 * Return value > 0 on success of creating device. 115 */ 116 static int acpi_apd_create_device(struct acpi_device *adev, 117 const struct acpi_device_id *id) 118 { 119 const struct apd_device_desc *dev_desc = (void *)id->driver_data; 120 struct apd_private_data *pdata; 121 struct platform_device *pdev; 122 int ret; 123 124 if (!dev_desc) { 125 pdev = acpi_create_platform_device(adev); 126 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1; 127 } 128 129 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); 130 if (!pdata) 131 return -ENOMEM; 132 133 pdata->adev = adev; 134 pdata->dev_desc = dev_desc; 135 136 if (dev_desc->setup) { 137 ret = dev_desc->setup(pdata); 138 if (ret) 139 goto err_out; 140 } 141 142 if (dev_desc->properties) { 143 ret = device_add_properties(&adev->dev, dev_desc->properties); 144 if (ret) 145 goto err_out; 146 } 147 148 adev->driver_data = pdata; 149 pdev = acpi_create_platform_device(adev); 150 if (!IS_ERR_OR_NULL(pdev)) 151 return 1; 152 153 ret = PTR_ERR(pdev); 154 adev->driver_data = NULL; 155 156 err_out: 157 kfree(pdata); 158 return ret; 159 } 160 161 static const struct acpi_device_id acpi_apd_device_ids[] = { 162 /* Generic apd devices */ 163 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE 164 { "AMD0010", APD_ADDR(cz_i2c_desc) }, 165 { "AMDI0010", APD_ADDR(cz_i2c_desc) }, 166 { "AMD0020", APD_ADDR(cz_uart_desc) }, 167 { "AMDI0020", APD_ADDR(cz_uart_desc) }, 168 { "AMD0030", }, 169 #endif 170 #ifdef CONFIG_ARM64 171 { "APMC0D0F", APD_ADDR(xgene_i2c_desc) }, 172 { "BRCM900D", APD_ADDR(vulcan_spi_desc) }, 173 #endif 174 { } 175 }; 176 177 static struct acpi_scan_handler apd_handler = { 178 .ids = acpi_apd_device_ids, 179 .attach = acpi_apd_create_device, 180 }; 181 182 void __init acpi_apd_init(void) 183 { 184 acpi_scan_add_handler(&apd_handler); 185 } 186