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https://github.com/edk2-porting/linux-next.git
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6ce2e188a6
On ARM64 some devices use the AMBA device and not the platform bus for probing so add support for this. Uses a dummy clock for apb_pclk as ACPI does not have a suitable clock representation and to keep the core AMBA bus code unchanged between probing methods. Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
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/*
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* ACPI support for platform bus type.
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*
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* Copyright (C) 2015, Linaro Ltd
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* Author: Graeme Gregory <graeme.gregory@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/acpi.h>
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#include <linux/amba/bus.h>
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#include <linux/clkdev.h>
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#include <linux/clk-provider.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "internal.h"
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static const struct acpi_device_id amba_id_list[] = {
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{"ARMH0061", 0}, /* PL061 GPIO Device */
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{"", 0},
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};
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static void amba_register_dummy_clk(void)
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{
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static struct clk *amba_dummy_clk;
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/* If clock already registered */
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if (amba_dummy_clk)
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return;
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amba_dummy_clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL,
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CLK_IS_ROOT, 0);
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clk_register_clkdev(amba_dummy_clk, "apb_pclk", NULL);
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}
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static int amba_handler_attach(struct acpi_device *adev,
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const struct acpi_device_id *id)
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{
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struct amba_device *dev;
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struct resource_entry *rentry;
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struct list_head resource_list;
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bool address_found = false;
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int irq_no = 0;
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int ret;
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/* If the ACPI node already has a physical device attached, skip it. */
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if (adev->physical_node_count)
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return 0;
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dev = amba_device_alloc(dev_name(&adev->dev), 0, 0);
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if (!dev) {
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dev_err(&adev->dev, "%s(): amba_device_alloc() failed\n",
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__func__);
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return -ENOMEM;
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}
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INIT_LIST_HEAD(&resource_list);
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ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
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if (ret < 0)
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goto err_free;
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list_for_each_entry(rentry, &resource_list, node) {
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switch (resource_type(rentry->res)) {
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case IORESOURCE_MEM:
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if (!address_found) {
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dev->res = *rentry->res;
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address_found = true;
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}
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break;
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case IORESOURCE_IRQ:
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if (irq_no < AMBA_NR_IRQS)
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dev->irq[irq_no++] = rentry->res->start;
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break;
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default:
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dev_warn(&adev->dev, "Invalid resource\n");
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break;
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}
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}
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acpi_dev_free_resource_list(&resource_list);
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/*
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* If the ACPI node has a parent and that parent has a physical device
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* attached to it, that physical device should be the parent of
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* the amba device we are about to create.
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*/
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if (adev->parent)
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dev->dev.parent = acpi_get_first_physical_node(adev->parent);
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ACPI_COMPANION_SET(&dev->dev, adev);
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ret = amba_device_add(dev, &iomem_resource);
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if (ret) {
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dev_err(&adev->dev, "%s(): amba_device_add() failed (%d)\n",
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__func__, ret);
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goto err_free;
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}
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return 1;
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err_free:
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amba_device_put(dev);
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return ret;
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}
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static struct acpi_scan_handler amba_handler = {
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.ids = amba_id_list,
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.attach = amba_handler_attach,
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};
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void __init acpi_amba_init(void)
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{
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amba_register_dummy_clk();
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acpi_scan_add_handler(&amba_handler);
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}
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