drivers/acpi/acpi_apd.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * AMD ACPI support for ACPI2platform device.
0004  *
0005  * Copyright (c) 2014,2015 AMD Corporation.
0006  * Authors: Ken Xue <Ken.Xue@amd.com>
0007  *  Wu, Jeff <Jeff.Wu@amd.com>
0008  */
0009
0010 #include <linux/acpi.h>
0011 #include <linux/clkdev.h>
0012 #include <linux/clk-provider.h>
0013 #include <linux/err.h>
0014 #include <linux/io.h>
0015 #include <linux/platform_data/clk-fch.h>
0016 #include <linux/platform_device.h>
0017
0018 #include "internal.h"
0019
0020 struct apd_private_data;
0021
0022 /**
0023  * struct apd_device_desc - a descriptor for apd device
0024  * @fixed_clk_rate: fixed rate input clock source for acpi device;
0025  *          0 means no fixed rate input clock source
0026  * @properties: build-in properties of the device such as UART
0027  * @setup: a hook routine to set device resource during create platform device
0028  *
0029  * Device description defined as acpi_device_id.driver_data
0030  */
0031 struct apd_device_desc {
0032     unsigned int fixed_clk_rate;
0033     struct property_entry *properties;
0034     int (*setup)(struct apd_private_data *pdata);
0035 };
0036
0037 struct apd_private_data {
0038     struct clk *clk;
0039     struct acpi_device *adev;
0040     const struct apd_device_desc *dev_desc;
0041 };
0042
0043 #if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
0044 #define APD_ADDR(desc)  ((unsigned long)&desc)
0045
0046 static int acpi_apd_setup(struct apd_private_data *pdata)
0047 {
0048     const struct apd_device_desc *dev_desc = pdata->dev_desc;
0049     struct clk *clk;
0050
0051     if (dev_desc->fixed_clk_rate) {
0052         clk = clk_register_fixed_rate(&pdata->adev->dev,
0053                     dev_name(&pdata->adev->dev),
0054                     NULL, 0, dev_desc->fixed_clk_rate);
0055         clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
0056         pdata->clk = clk;
0057     }
0058
0059     return 0;
0060 }
0061
0062 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
0063 static int misc_check_res(struct acpi_resource *ares, void *data)
0064 {
0065     struct resource res;
0066
0067     return !acpi_dev_resource_memory(ares, &res);
0068 }
0069
0070 static int fch_misc_setup(struct apd_private_data *pdata)
0071 {
0072     struct acpi_device *adev = pdata->adev;
0073     const union acpi_object *obj;
0074     struct platform_device *clkdev;
0075     struct fch_clk_data *clk_data;
0076     struct resource_entry *rentry;
0077     struct list_head resource_list;
0078     int ret;
0079
0080     clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
0081     if (!clk_data)
0082         return -ENOMEM;
0083
0084     INIT_LIST_HEAD(&resource_list);
0085     ret = acpi_dev_get_resources(adev, &resource_list, misc_check_res,
0086                      NULL);
0087     if (ret < 0)
0088         return -ENOENT;
0089
0090     if (!acpi_dev_get_property(adev, "clk-name", ACPI_TYPE_STRING, &obj)) {
0091         clk_data->name = devm_kzalloc(&adev->dev, obj->string.length,
0092                           GFP_KERNEL);
0093
0094         strcpy(clk_data->name, obj->string.pointer);
0095     } else {
0096         /* Set default name to mclk if entry missing in firmware */
0097         clk_data->name = "mclk";
0098     }
0099
0100     list_for_each_entry(rentry, &resource_list, node) {
0101         clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
0102                           resource_size(rentry->res));
0103         break;
0104     }
0105     if (!clk_data->base)
0106         return -ENOMEM;
0107
0108     acpi_dev_free_resource_list(&resource_list);
0109
0110     clkdev = platform_device_register_data(&adev->dev, "clk-fch",
0111                            PLATFORM_DEVID_NONE, clk_data,
0112                            sizeof(*clk_data));
0113     return PTR_ERR_OR_ZERO(clkdev);
0114 }
0115
0116 static const struct apd_device_desc cz_i2c_desc = {
0117     .setup = acpi_apd_setup,
0118     .fixed_clk_rate = 133000000,
0119 };
0120
0121 static const struct apd_device_desc wt_i2c_desc = {
0122     .setup = acpi_apd_setup,
0123     .fixed_clk_rate = 150000000,
0124 };
0125
0126 static struct property_entry uart_properties[] = {
0127     PROPERTY_ENTRY_U32("reg-io-width", 4),
0128     PROPERTY_ENTRY_U32("reg-shift", 2),
0129     PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
0130     { },
0131 };
0132
0133 static const struct apd_device_desc cz_uart_desc = {
0134     .setup = acpi_apd_setup,
0135     .fixed_clk_rate = 48000000,
0136     .properties = uart_properties,
0137 };
0138
0139 static const struct apd_device_desc fch_misc_desc = {
0140     .setup = fch_misc_setup,
0141 };
0142 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
0143
0144 #ifdef CONFIG_ARM64
0145 static const struct apd_device_desc xgene_i2c_desc = {
0146     .setup = acpi_apd_setup,
0147     .fixed_clk_rate = 100000000,
0148 };
0149
0150 static const struct apd_device_desc vulcan_spi_desc = {
0151     .setup = acpi_apd_setup,
0152     .fixed_clk_rate = 133000000,
0153 };
0154
0155 static const struct apd_device_desc hip07_i2c_desc = {
0156     .setup = acpi_apd_setup,
0157     .fixed_clk_rate = 200000000,
0158 };
0159
0160 static const struct apd_device_desc hip08_i2c_desc = {
0161     .setup = acpi_apd_setup,
0162     .fixed_clk_rate = 250000000,
0163 };
0164
0165 static const struct apd_device_desc hip08_lite_i2c_desc = {
0166     .setup = acpi_apd_setup,
0167     .fixed_clk_rate = 125000000,
0168 };
0169
0170 static const struct apd_device_desc thunderx2_i2c_desc = {
0171     .setup = acpi_apd_setup,
0172     .fixed_clk_rate = 125000000,
0173 };
0174
0175 static const struct apd_device_desc nxp_i2c_desc = {
0176     .setup = acpi_apd_setup,
0177     .fixed_clk_rate = 350000000,
0178 };
0179
0180 static const struct apd_device_desc hip08_spi_desc = {
0181     .setup = acpi_apd_setup,
0182     .fixed_clk_rate = 250000000,
0183 };
0184 #endif /* CONFIG_ARM64 */
0185
0186 #endif
0187
0188 /*
0189  * Create platform device during acpi scan attach handle.
0190  * Return value > 0 on success of creating device.
0191  */
0192 static int acpi_apd_create_device(struct acpi_device *adev,
0193                    const struct acpi_device_id *id)
0194 {
0195     const struct apd_device_desc *dev_desc = (void *)id->driver_data;
0196     struct apd_private_data *pdata;
0197     struct platform_device *pdev;
0198     int ret;
0199
0200     if (!dev_desc) {
0201         pdev = acpi_create_platform_device(adev, NULL);
0202         return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
0203     }
0204
0205     pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
0206     if (!pdata)
0207         return -ENOMEM;
0208
0209     pdata->adev = adev;
0210     pdata->dev_desc = dev_desc;
0211
0212     if (dev_desc->setup) {
0213         ret = dev_desc->setup(pdata);
0214         if (ret)
0215             goto err_out;
0216     }
0217
0218     adev->driver_data = pdata;
0219     pdev = acpi_create_platform_device(adev, dev_desc->properties);
0220     if (!IS_ERR_OR_NULL(pdev))
0221         return 1;
0222
0223     ret = PTR_ERR(pdev);
0224     adev->driver_data = NULL;
0225
0226  err_out:
0227     kfree(pdata);
0228     return ret;
0229 }
0230
0231 static const struct acpi_device_id acpi_apd_device_ids[] = {
0232     /* Generic apd devices */
0233 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
0234     { "AMD0010", APD_ADDR(cz_i2c_desc) },
0235     { "AMD0020", APD_ADDR(cz_uart_desc) },
0236     { "AMD0030", },
0237     { "AMD0040", APD_ADDR(fch_misc_desc)},
0238     { "AMDI0010", APD_ADDR(wt_i2c_desc) },
0239     { "AMDI0019", APD_ADDR(wt_i2c_desc) },
0240     { "AMDI0020", APD_ADDR(cz_uart_desc) },
0241     { "AMDI0022", APD_ADDR(cz_uart_desc) },
0242     { "HYGO0010", APD_ADDR(wt_i2c_desc) },
0243 #endif
0244 #ifdef CONFIG_ARM64
0245     { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
0246     { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
0247     { "CAV900D",  APD_ADDR(vulcan_spi_desc) },
0248     { "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
0249     { "HISI02A1", APD_ADDR(hip07_i2c_desc) },
0250     { "HISI02A2", APD_ADDR(hip08_i2c_desc) },
0251     { "HISI02A3", APD_ADDR(hip08_lite_i2c_desc) },
0252     { "HISI0173", APD_ADDR(hip08_spi_desc) },
0253     { "NXP0001", APD_ADDR(nxp_i2c_desc) },
0254 #endif
0255     { }
0256 };
0257
0258 static struct acpi_scan_handler apd_handler = {
0259     .ids = acpi_apd_device_ids,
0260     .attach = acpi_apd_create_device,
0261 };
0262
0263 void __init acpi_apd_init(void)
0264 {
0265     acpi_scan_add_handler(&apd_handler);
0266 }