1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * AMD ACPI support for ACPI2platform device. 4 * 5 * Copyright (c) 2014,2015 AMD Corporation. 6 * Authors: Ken Xue <Ken.Xue@amd.com> 7 * Wu, Jeff <Jeff.Wu@amd.com> 8 */ 9 10 #include <linux/clk-provider.h> 11 #include <linux/platform_data/clk-st.h> 12 #include <linux/platform_device.h> 13 #include <linux/pm_domain.h> 14 #include <linux/clkdev.h> 15 #include <linux/acpi.h> 16 #include <linux/err.h> 17 #include <linux/io.h> 18 #include <linux/pm.h> 19 20 #include "internal.h" 21 22 ACPI_MODULE_NAME("acpi_apd"); 23 struct apd_private_data; 24 25 /** 26 * ACPI_APD_SYSFS : add device attributes in sysfs 27 * ACPI_APD_PM : attach power domain to device 28 */ 29 #define ACPI_APD_SYSFS BIT(0) 30 #define ACPI_APD_PM BIT(1) 31 32 /** 33 * struct apd_device_desc - a descriptor for apd device 34 * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM 35 * @fixed_clk_rate: fixed rate input clock source for acpi device; 36 * 0 means no fixed rate input clock source 37 * @setup: a hook routine to set device resource during create platform device 38 * 39 * Device description defined as acpi_device_id.driver_data 40 */ 41 struct apd_device_desc { 42 unsigned int flags; 43 unsigned int fixed_clk_rate; 44 struct property_entry *properties; 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; 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 75 static int misc_check_res(struct acpi_resource *ares, void *data) 76 { 77 struct resource res; 78 79 return !acpi_dev_resource_memory(ares, &res); 80 } 81 82 static int st_misc_setup(struct apd_private_data *pdata) 83 { 84 struct acpi_device *adev = pdata->adev; 85 struct platform_device *clkdev; 86 struct st_clk_data *clk_data; 87 struct resource_entry *rentry; 88 struct list_head resource_list; 89 int ret; 90 91 clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL); 92 if (!clk_data) 93 return -ENOMEM; 94 95 INIT_LIST_HEAD(&resource_list); 96 ret = acpi_dev_get_resources(adev, &resource_list, misc_check_res, 97 NULL); 98 if (ret < 0) 99 return -ENOENT; 100 101 list_for_each_entry(rentry, &resource_list, node) { 102 clk_data->base = devm_ioremap(&adev->dev, rentry->res->start, 103 resource_size(rentry->res)); 104 break; 105 } 106 107 acpi_dev_free_resource_list(&resource_list); 108 109 clkdev = platform_device_register_data(&adev->dev, "clk-st", 110 PLATFORM_DEVID_NONE, clk_data, 111 sizeof(*clk_data)); 112 return PTR_ERR_OR_ZERO(clkdev); 113 } 114 115 static const struct apd_device_desc cz_i2c_desc = { 116 .setup = acpi_apd_setup, 117 .fixed_clk_rate = 133000000, 118 }; 119 120 static const struct apd_device_desc wt_i2c_desc = { 121 .setup = acpi_apd_setup, 122 .fixed_clk_rate = 150000000, 123 }; 124 125 static struct property_entry uart_properties[] = { 126 PROPERTY_ENTRY_U32("reg-io-width", 4), 127 PROPERTY_ENTRY_U32("reg-shift", 2), 128 PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"), 129 { }, 130 }; 131 132 static const struct apd_device_desc cz_uart_desc = { 133 .setup = acpi_apd_setup, 134 .fixed_clk_rate = 48000000, 135 .properties = uart_properties, 136 }; 137 138 static const struct apd_device_desc st_misc_desc = { 139 .setup = st_misc_setup, 140 }; 141 #endif 142 143 #ifdef CONFIG_ARM64 144 static const struct apd_device_desc xgene_i2c_desc = { 145 .setup = acpi_apd_setup, 146 .fixed_clk_rate = 100000000, 147 }; 148 149 static const struct apd_device_desc vulcan_spi_desc = { 150 .setup = acpi_apd_setup, 151 .fixed_clk_rate = 133000000, 152 }; 153 154 static const struct apd_device_desc hip07_i2c_desc = { 155 .setup = acpi_apd_setup, 156 .fixed_clk_rate = 200000000, 157 }; 158 159 static const struct apd_device_desc hip08_i2c_desc = { 160 .setup = acpi_apd_setup, 161 .fixed_clk_rate = 250000000, 162 }; 163 164 static const struct apd_device_desc thunderx2_i2c_desc = { 165 .setup = acpi_apd_setup, 166 .fixed_clk_rate = 125000000, 167 }; 168 169 static const struct apd_device_desc nxp_i2c_desc = { 170 .setup = acpi_apd_setup, 171 .fixed_clk_rate = 350000000, 172 }; 173 174 static const struct apd_device_desc hip08_spi_desc = { 175 .setup = acpi_apd_setup, 176 .fixed_clk_rate = 250000000, 177 }; 178 #endif 179 180 #else 181 182 #define APD_ADDR(desc) (0UL) 183 184 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */ 185 186 /** 187 * Create platform device during acpi scan attach handle. 188 * Return value > 0 on success of creating device. 189 */ 190 static int acpi_apd_create_device(struct acpi_device *adev, 191 const struct acpi_device_id *id) 192 { 193 const struct apd_device_desc *dev_desc = (void *)id->driver_data; 194 struct apd_private_data *pdata; 195 struct platform_device *pdev; 196 int ret; 197 198 if (!dev_desc) { 199 pdev = acpi_create_platform_device(adev, NULL); 200 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1; 201 } 202 203 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); 204 if (!pdata) 205 return -ENOMEM; 206 207 pdata->adev = adev; 208 pdata->dev_desc = dev_desc; 209 210 if (dev_desc->setup) { 211 ret = dev_desc->setup(pdata); 212 if (ret) 213 goto err_out; 214 } 215 216 adev->driver_data = pdata; 217 pdev = acpi_create_platform_device(adev, dev_desc->properties); 218 if (!IS_ERR_OR_NULL(pdev)) 219 return 1; 220 221 ret = PTR_ERR(pdev); 222 adev->driver_data = NULL; 223 224 err_out: 225 kfree(pdata); 226 return ret; 227 } 228 229 static const struct acpi_device_id acpi_apd_device_ids[] = { 230 /* Generic apd devices */ 231 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE 232 { "AMD0010", APD_ADDR(cz_i2c_desc) }, 233 { "AMDI0010", APD_ADDR(wt_i2c_desc) }, 234 { "AMD0020", APD_ADDR(cz_uart_desc) }, 235 { "AMDI0020", APD_ADDR(cz_uart_desc) }, 236 { "AMD0030", }, 237 { "AMD0040", APD_ADDR(st_misc_desc)}, 238 #endif 239 #ifdef CONFIG_ARM64 240 { "APMC0D0F", APD_ADDR(xgene_i2c_desc) }, 241 { "BRCM900D", APD_ADDR(vulcan_spi_desc) }, 242 { "CAV900D", APD_ADDR(vulcan_spi_desc) }, 243 { "CAV9007", APD_ADDR(thunderx2_i2c_desc) }, 244 { "HISI02A1", APD_ADDR(hip07_i2c_desc) }, 245 { "HISI02A2", APD_ADDR(hip08_i2c_desc) }, 246 { "HISI0173", APD_ADDR(hip08_spi_desc) }, 247 { "NXP0001", APD_ADDR(nxp_i2c_desc) }, 248 #endif 249 { } 250 }; 251 252 static struct acpi_scan_handler apd_handler = { 253 .ids = acpi_apd_device_ids, 254 .attach = acpi_apd_create_device, 255 }; 256 257 void __init acpi_apd_init(void) 258 { 259 acpi_scan_add_handler(&apd_handler); 260 } 261