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ca5a75df36
Currently the ACPI code doesn't bump the reference count of the firmware node, while OF counter part does. Not that it's a problem right now, since ACPI doesn't really use the reference counting for firmware nodes, it still makes sense to make code robust against any changes done there. For this, - switch ACPI case to use device_set_node() to be unified with OF - move reference counting to amba_device_add() - switch to use firmware nodes instead of OF ones In the result we will have reference counting done in the same module for all callers independently on the nature of firmware node behind. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20231006145732.3419115-1-andriy.shevchenko@linux.intel.com Signed-off-by: Rob Herring <robh@kernel.org>
129 lines
3.1 KiB
C
129 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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#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 "init.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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{"ARMH0330", 0}, /* ARM DMA Controller DMA-330 */
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{"ARMHC501", 0}, /* ARM CoreSight ETR */
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{"ARMHC502", 0}, /* ARM CoreSight STM */
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{"ARMHC503", 0}, /* ARM CoreSight Debug */
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{"ARMHC979", 0}, /* ARM CoreSight TPIU */
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{"ARMHC97C", 0}, /* ARM CoreSight SoC-400 TMC, SoC-600 ETF/ETB */
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{"ARMHC98D", 0}, /* ARM CoreSight Dynamic Replicator */
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{"ARMHC9CA", 0}, /* ARM CoreSight CATU */
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{"ARMHC9FF", 0}, /* ARM CoreSight Dynamic Funnel */
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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, 0, 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 acpi_device *parent = acpi_dev_parent(adev);
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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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dev->res.name = dev_name(&dev->dev);
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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 (parent)
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dev->dev.parent = acpi_get_first_physical_node(parent);
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device_set_node(&dev->dev, acpi_fwnode_handle(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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