mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Akshu Agrawal](/assets/img/avatar_default.png)
AMD SoC exposes clock for general purpose use. The clock registration is done in clk-st driver. The MMIO mapping are passed on to the clock driver for accessing the registers. The misc clock handler will create MMIO mappings to access the clock registers and enable the clock driver to expose the clock for use of drivers which will connect to it. Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com> Reviewed-by: Daniel Kurtz <djkurtz@chromium.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
249 lines
6 KiB
C
249 lines
6 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/platform_data/clk-st.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm_domain.h>
|
|
#include <linux/clkdev.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/err.h>
|
|
#include <linux/pm.h>
|
|
|
|
#include "internal.h"
|
|
|
|
ACPI_MODULE_NAME("acpi_apd");
|
|
struct apd_private_data;
|
|
|
|
/**
|
|
* ACPI_APD_SYSFS : add device attributes in sysfs
|
|
* ACPI_APD_PM : attach power domain to device
|
|
*/
|
|
#define ACPI_APD_SYSFS BIT(0)
|
|
#define ACPI_APD_PM BIT(1)
|
|
|
|
/**
|
|
* struct apd_device_desc - a descriptor for apd device
|
|
* @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
|
|
* @fixed_clk_rate: fixed rate input clock source for acpi device;
|
|
* 0 means no fixed rate input clock source
|
|
* @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 flags;
|
|
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 = ERR_PTR(-ENODEV);
|
|
|
|
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 misc_check_res(struct acpi_resource *ares, void *data)
|
|
{
|
|
struct resource res;
|
|
|
|
return !acpi_dev_resource_memory(ares, &res);
|
|
}
|
|
|
|
static int st_misc_setup(struct apd_private_data *pdata)
|
|
{
|
|
struct acpi_device *adev = pdata->adev;
|
|
struct platform_device *clkdev;
|
|
struct st_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_resources(adev, &resource_list, misc_check_res,
|
|
NULL);
|
|
if (ret < 0)
|
|
return -ENOENT;
|
|
|
|
list_for_each_entry(rentry, &resource_list, node) {
|
|
clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
|
|
resource_size(rentry->res));
|
|
break;
|
|
}
|
|
|
|
acpi_dev_free_resource_list(&resource_list);
|
|
|
|
clkdev = platform_device_register_data(&adev->dev, "clk-st",
|
|
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 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 st_misc_desc = {
|
|
.setup = st_misc_setup,
|
|
};
|
|
#endif
|
|
|
|
#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 thunderx2_i2c_desc = {
|
|
.setup = acpi_apd_setup,
|
|
.fixed_clk_rate = 125000000,
|
|
};
|
|
#endif
|
|
|
|
#else
|
|
|
|
#define APD_ADDR(desc) (0UL)
|
|
|
|
#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
|
|
|
|
/**
|
|
* 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) },
|
|
{ "AMDI0010", APD_ADDR(wt_i2c_desc) },
|
|
{ "AMD0020", APD_ADDR(cz_uart_desc) },
|
|
{ "AMDI0020", APD_ADDR(cz_uart_desc) },
|
|
{ "AMD0030", },
|
|
{ "AMD0040", APD_ADDR(st_misc_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) },
|
|
#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);
|
|
}
|