Quelle  acpi_apd.c   Sprache: unbekannt

// SPDX-License-Identifier: GPL-2.0-only
/*
 * AMD ACPI support for ACPI2platform device.
 *
 * Copyright (c) 2014,2015 AMD Corporation.
 * Authors: Ken Xue <Ken.Xue@amd.com>
 * Wu, Jeff <Jeff.Wu@amd.com>
 */

#include <linux/acpi.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_data/clk-fch.h>
#include <linux/platform_device.h>

#include "internal.h"

struct apd_private_data;

/**
 * struct apd_device_desc - a descriptor for apd device
 * @fixed_clk_rate: fixed rate input clock source for acpi device;
 * 0 means no fixed rate input clock source
 * @properties: build-in properties of the device such as UART
 * @setup: a hook routine to set device resource during create platform device
 *
 * Device description defined as acpi_device_id.driver_data
 */
struct apd_device_desc {
 unsigned int fixed_clk_rate;
 struct property_entry *properties;
 int (*setup)(struct apd_private_data *pdata);
};

struct apd_private_data {
 struct clk *clk;
 struct acpi_device *adev;
 const struct apd_device_desc *dev_desc;
};

#if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
#define APD_ADDR(desc) ((unsigned long)&desc)

static int acpi_apd_setup(struct apd_private_data *pdata)
{
 const struct apd_device_desc *dev_desc = pdata->dev_desc;
 struct clk *clk;

 if (dev_desc->fixed_clk_rate) {
  clk = clk_register_fixed_rate(&pdata->adev->dev,
     dev_name(&pdata->adev->dev),
     NULL, 0, dev_desc->fixed_clk_rate);
  clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
  pdata->clk = clk;
 }

 return 0;
}

#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE

static int fch_misc_setup(struct apd_private_data *pdata)
{
 struct acpi_device *adev = pdata->adev;
 const union acpi_object *obj;
 struct platform_device *clkdev;
 struct fch_clk_data *clk_data;
 struct resource_entry *rentry;
 struct list_head resource_list;
 int ret;

 clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
 if (!clk_data)
  return -ENOMEM;

 INIT_LIST_HEAD(&resource_list);
 ret = acpi_dev_get_memory_resources(adev, &resource_list);
 if (ret < 0)
  return -ENOENT;

 if (!acpi_dev_get_property(adev, "clk-name", ACPI_TYPE_STRING, &obj)) {
  clk_data->name = devm_kzalloc(&adev->dev, obj->string.length,
           GFP_KERNEL);
  if (!clk_data->name)
   return -ENOMEM;

  strscpy(clk_data->name, obj->string.pointer, obj->string.length);
 } else {
  /* Set default name to mclk if entry missing in firmware */
  clk_data->name = "mclk";
 }

 list_for_each_entry(rentry, &resource_list, node) {
  clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
           resource_size(rentry->res));
  break;
 }
 if (!clk_data->base)
  return -ENOMEM;

 acpi_dev_free_resource_list(&resource_list);

 clkdev = platform_device_register_data(&adev->dev, "clk-fch",
            PLATFORM_DEVID_NONE, clk_data,
            sizeof(*clk_data));
 return PTR_ERR_OR_ZERO(clkdev);
}

static const struct apd_device_desc cz_i2c_desc = {
 .setup = acpi_apd_setup,
 .fixed_clk_rate = 133000000,
};

static const struct apd_device_desc wt_i2c_desc = {
 .setup = acpi_apd_setup,
 .fixed_clk_rate = 150000000,
};

static const struct apd_device_desc wt_i3c_desc = {
 .setup = acpi_apd_setup,
 .fixed_clk_rate = 125000000,
};

static struct property_entry uart_properties[] = {
 PROPERTY_ENTRY_U32("reg-io-width", 4),
 PROPERTY_ENTRY_U32("reg-shift", 2),
 PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
 { },
};

static const struct apd_device_desc cz_uart_desc = {
 .setup = acpi_apd_setup,
 .fixed_clk_rate = 48000000,
 .properties = uart_properties,
};

static const struct apd_device_desc fch_misc_desc = {
 .setup = fch_misc_setup,
};
#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */

#ifdef CONFIG_ARM64
static const struct apd_device_desc xgene_i2c_desc = {
 .setup = acpi_apd_setup,
 .fixed_clk_rate = 100000000,
};

static const struct apd_device_desc vulcan_spi_desc = {
 .setup = acpi_apd_setup,
 .fixed_clk_rate = 133000000,
};

static const struct apd_device_desc hip07_i2c_desc = {
 .setup = acpi_apd_setup,
 .fixed_clk_rate = 200000000,
};

static const struct apd_device_desc hip08_i2c_desc = {
 .setup = acpi_apd_setup,
 .fixed_clk_rate = 250000000,
};

static const struct apd_device_desc hip08_lite_i2c_desc = {
 .setup = acpi_apd_setup,
 .fixed_clk_rate = 125000000,
};

static const struct apd_device_desc thunderx2_i2c_desc = {
 .setup = acpi_apd_setup,
 .fixed_clk_rate = 125000000,
};

static const struct apd_device_desc nxp_i2c_desc = {
 .setup = acpi_apd_setup,
 .fixed_clk_rate = 350000000,
};

static const struct apd_device_desc hip08_spi_desc = {
 .setup = acpi_apd_setup,
 .fixed_clk_rate = 250000000,
};
#endif /* CONFIG_ARM64 */

#endif

/*
 * Create platform device during acpi scan attach handle.
 * Return value > 0 on success of creating device.
 */
static int acpi_apd_create_device(struct acpi_device *adev,
       const struct acpi_device_id *id)
{
 const struct apd_device_desc *dev_desc = (void *)id->driver_data;
 struct apd_private_data *pdata;
 struct platform_device *pdev;
 int ret;

 if (!dev_desc) {
  pdev = acpi_create_platform_device(adev, NULL);
  return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
 }

 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 if (!pdata)
  return -ENOMEM;

 pdata->adev = adev;
 pdata->dev_desc = dev_desc;

 if (dev_desc->setup) {
  ret = dev_desc->setup(pdata);
  if (ret)
   goto err_out;
 }

 adev->driver_data = pdata;
 pdev = acpi_create_platform_device(adev, dev_desc->properties);
 if (!IS_ERR_OR_NULL(pdev))
  return 1;

 ret = PTR_ERR(pdev);
 adev->driver_data = NULL;

 err_out:
 kfree(pdata);
 return ret;
}

static const struct acpi_device_id acpi_apd_device_ids[] = {
 /* Generic apd devices */
#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
 { "AMD0010", APD_ADDR(cz_i2c_desc) },
 { "AMD0020", APD_ADDR(cz_uart_desc) },
 { "AMD0030", },
 { "AMD0040", APD_ADDR(fch_misc_desc)},
 { "AMDI0010", APD_ADDR(wt_i2c_desc) },
 { "AMDI0015", APD_ADDR(wt_i3c_desc) },
 { "AMDI0019", APD_ADDR(wt_i2c_desc) },
 { "AMDI0020", APD_ADDR(cz_uart_desc) },
 { "AMDI0022", APD_ADDR(cz_uart_desc) },
 { "HYGO0010", APD_ADDR(wt_i2c_desc) },
#endif
#ifdef CONFIG_ARM64
 { "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
 { "BRCM900D", APD_ADDR(vulcan_spi_desc) },
 { "CAV900D",  APD_ADDR(vulcan_spi_desc) },
 { "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
 { "HISI02A1", APD_ADDR(hip07_i2c_desc) },
 { "HISI02A2", APD_ADDR(hip08_i2c_desc) },
 { "HISI02A3", APD_ADDR(hip08_lite_i2c_desc) },
 { "HISI0173", APD_ADDR(hip08_spi_desc) },
 { "NXP0001", APD_ADDR(nxp_i2c_desc) },
#endif
 { }
};

static struct acpi_scan_handler apd_handler = {
 .ids = acpi_apd_device_ids,
 .attach = acpi_apd_create_device,
};

void __init acpi_apd_init(void)
{
 acpi_scan_add_handler(&apd_handler);
}