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 }; 109 110 static const struct apd_device_desc hip07_i2c_desc = { 111 .setup = acpi_apd_setup, 112 .fixed_clk_rate = 200000000, 113 }; 114 115 static const struct apd_device_desc hip08_i2c_desc = { 116 .setup = acpi_apd_setup, 117 .fixed_clk_rate = 250000000, 118 }; 119 #endif 120 121 #else 122 123 #define APD_ADDR(desc) (0UL) 124 125 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */ 126 127 /** 128 * Create platform device during acpi scan attach handle. 129 * Return value > 0 on success of creating device. 130 */ 131 static int acpi_apd_create_device(struct acpi_device *adev, 132 const struct acpi_device_id *id) 133 { 134 const struct apd_device_desc *dev_desc = (void *)id->driver_data; 135 struct apd_private_data *pdata; 136 struct platform_device *pdev; 137 int ret; 138 139 if (!dev_desc) { 140 pdev = acpi_create_platform_device(adev, NULL); 141 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1; 142 } 143 144 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); 145 if (!pdata) 146 return -ENOMEM; 147 148 pdata->adev = adev; 149 pdata->dev_desc = dev_desc; 150 151 if (dev_desc->setup) { 152 ret = dev_desc->setup(pdata); 153 if (ret) 154 goto err_out; 155 } 156 157 adev->driver_data = pdata; 158 pdev = acpi_create_platform_device(adev, dev_desc->properties); 159 if (!IS_ERR_OR_NULL(pdev)) 160 return 1; 161 162 ret = PTR_ERR(pdev); 163 adev->driver_data = NULL; 164 165 err_out: 166 kfree(pdata); 167 return ret; 168 } 169 170 static const struct acpi_device_id acpi_apd_device_ids[] = { 171 /* Generic apd devices */ 172 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE 173 { "AMD0010", APD_ADDR(cz_i2c_desc) }, 174 { "AMDI0010", APD_ADDR(wt_i2c_desc) }, 175 { "AMD0020", APD_ADDR(cz_uart_desc) }, 176 { "AMDI0020", APD_ADDR(cz_uart_desc) }, 177 { "AMD0030", }, 178 #endif 179 #ifdef CONFIG_ARM64 180 { "APMC0D0F", APD_ADDR(xgene_i2c_desc) }, 181 { "BRCM900D", APD_ADDR(vulcan_spi_desc) }, 182 { "CAV900D", APD_ADDR(vulcan_spi_desc) }, 183 { "HISI0A21", APD_ADDR(hip07_i2c_desc) }, 184 { "HISI0A22", APD_ADDR(hip08_i2c_desc) }, 185 #endif 186 { } 187 }; 188 189 static struct acpi_scan_handler apd_handler = { 190 .ids = acpi_apd_device_ids, 191 .attach = acpi_apd_create_device, 192 }; 193 194 void __init acpi_apd_init(void) 195 { 196 acpi_scan_add_handler(&apd_handler); 197 } 198