linux/drivers/acpi/acpi_amba.c
Rafael J. Wysocki 7b4baa39de Merge branches 'acpi-ec', 'acpi-ac', 'acpi-fan', 'acpi-video' and 'acpi-amba'
Merge EC, AC, fan and backlight driver changes and ACPI AMBA support
update for 6.1-rc1:

 - Drop unneeded result variable from ec_write() (ye xingchen).

 - Remove the leftover struct acpi_ac_bl from the ACPI AC driver (Hanjun
   Guo).

 - Reorder symbols to get rid of a few forward declarations in the ACPI
   fan driver (Uwe Kleine-König).

 - Add Toshiba Satellite/Portege Z830 ACPI backlight quirk (Arvid
   Norlander).

 - Add ARM DMA-330 controller to the supported list in the ACPI AMBA
   driver (Vijayenthiran Subramaniam).

* acpi-ec:
  ACPI: EC: Drop unneeded result variable from ec_write()

* acpi-ac:
  ACPI: AC: Remove the leftover struct acpi_ac_bl

* acpi-fan:
  ACPI: fan: Reorder symbols to get rid of a few forward declarations

* acpi-video:
  ACPI: video: Add Toshiba Satellite/Portege Z830 quirk

* acpi-amba:
  ACPI: AMBA: Add ARM DMA-330 controller to the supported list
2022-10-03 19:59:47 +02:00

131 lines
3.2 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* ACPI support for platform bus type.
*
* Copyright (C) 2015, Linaro Ltd
* Author: Graeme Gregory <graeme.gregory@linaro.org>
*/
#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 */
{"ARMH0330", 0}, /* ARM DMA Controller DMA-330 */
{"ARMHC500", 0}, /* ARM CoreSight ETM4x */
{"ARMHC501", 0}, /* ARM CoreSight ETR */
{"ARMHC502", 0}, /* ARM CoreSight STM */
{"ARMHC503", 0}, /* ARM CoreSight Debug */
{"ARMHC979", 0}, /* ARM CoreSight TPIU */
{"ARMHC97C", 0}, /* ARM CoreSight SoC-400 TMC, SoC-600 ETF/ETB */
{"ARMHC98D", 0}, /* ARM CoreSight Dynamic Replicator */
{"ARMHC9CA", 0}, /* ARM CoreSight CATU */
{"ARMHC9FF", 0}, /* ARM CoreSight Dynamic Funnel */
{"", 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 acpi_device *parent = acpi_dev_parent(adev);
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;
dev->res.name = dev_name(&dev->dev);
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 (parent)
dev->dev.parent = acpi_get_first_physical_node(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);
}