mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
628e35baa8
This flag is a no-op now (see commit 47b0eeb3dc "clk: Deprecate
CLK_IS_ROOT", 2016-02-02) so remove it.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
|
|
/*
|
|
* ACPI support for platform bus type.
|
|
*
|
|
* Copyright (C) 2015, Linaro Ltd
|
|
* Author: Graeme Gregory <graeme.gregory@linaro.org>
|
|
*
|
|
* 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/acpi.h>
|
|
#include <linux/amba/bus.h>
|
|
#include <linux/clkdev.h>
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "internal.h"
|
|
|
|
static const struct acpi_device_id amba_id_list[] = {
|
|
{"ARMH0061", 0}, /* PL061 GPIO Device */
|
|
{"", 0},
|
|
};
|
|
|
|
static void amba_register_dummy_clk(void)
|
|
{
|
|
static struct clk *amba_dummy_clk;
|
|
|
|
/* If clock already registered */
|
|
if (amba_dummy_clk)
|
|
return;
|
|
|
|
amba_dummy_clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, 0, 0);
|
|
clk_register_clkdev(amba_dummy_clk, "apb_pclk", NULL);
|
|
}
|
|
|
|
static int amba_handler_attach(struct acpi_device *adev,
|
|
const struct acpi_device_id *id)
|
|
{
|
|
struct amba_device *dev;
|
|
struct resource_entry *rentry;
|
|
struct list_head resource_list;
|
|
bool address_found = false;
|
|
int irq_no = 0;
|
|
int ret;
|
|
|
|
/* If the ACPI node already has a physical device attached, skip it. */
|
|
if (adev->physical_node_count)
|
|
return 0;
|
|
|
|
dev = amba_device_alloc(dev_name(&adev->dev), 0, 0);
|
|
if (!dev) {
|
|
dev_err(&adev->dev, "%s(): amba_device_alloc() failed\n",
|
|
__func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&resource_list);
|
|
ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
|
|
if (ret < 0)
|
|
goto err_free;
|
|
|
|
list_for_each_entry(rentry, &resource_list, node) {
|
|
switch (resource_type(rentry->res)) {
|
|
case IORESOURCE_MEM:
|
|
if (!address_found) {
|
|
dev->res = *rentry->res;
|
|
address_found = true;
|
|
}
|
|
break;
|
|
case IORESOURCE_IRQ:
|
|
if (irq_no < AMBA_NR_IRQS)
|
|
dev->irq[irq_no++] = rentry->res->start;
|
|
break;
|
|
default:
|
|
dev_warn(&adev->dev, "Invalid resource\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
acpi_dev_free_resource_list(&resource_list);
|
|
|
|
/*
|
|
* If the ACPI node has a parent and that parent has a physical device
|
|
* attached to it, that physical device should be the parent of
|
|
* the amba device we are about to create.
|
|
*/
|
|
if (adev->parent)
|
|
dev->dev.parent = acpi_get_first_physical_node(adev->parent);
|
|
|
|
ACPI_COMPANION_SET(&dev->dev, adev);
|
|
|
|
ret = amba_device_add(dev, &iomem_resource);
|
|
if (ret) {
|
|
dev_err(&adev->dev, "%s(): amba_device_add() failed (%d)\n",
|
|
__func__, ret);
|
|
goto err_free;
|
|
}
|
|
|
|
return 1;
|
|
|
|
err_free:
|
|
amba_device_put(dev);
|
|
return ret;
|
|
}
|
|
|
|
static struct acpi_scan_handler amba_handler = {
|
|
.ids = amba_id_list,
|
|
.attach = amba_handler_attach,
|
|
};
|
|
|
|
void __init acpi_amba_init(void)
|
|
{
|
|
amba_register_dummy_clk();
|
|
acpi_scan_add_handler(&amba_handler);
|
|
}
|