1 // SPDX-License-Identifier: GPL-2.0-only
4 * ACPI support for platform bus type.
6 * Copyright (C) 2015, Linaro Ltd
7 * Author: Graeme Gregory <graeme.gregory@linaro.org>
10 #include <linux/acpi.h>
11 #include <linux/amba/bus.h>
12 #include <linux/clkdev.h>
13 #include <linux/clk-provider.h>
14 #include <linux/device.h>
15 #include <linux/err.h>
16 #include <linux/ioport.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
22 static const struct acpi_device_id amba_id_list[] = {
23 {"ARMH0061", 0}, /* PL061 GPIO Device */
24 {"ARMH0330", 0}, /* ARM DMA Controller DMA-330 */
25 {"ARMHC501", 0}, /* ARM CoreSight ETR */
26 {"ARMHC502", 0}, /* ARM CoreSight STM */
27 {"ARMHC503", 0}, /* ARM CoreSight Debug */
28 {"ARMHC979", 0}, /* ARM CoreSight TPIU */
29 {"ARMHC97C", 0}, /* ARM CoreSight SoC-400 TMC, SoC-600 ETF/ETB */
30 {"ARMHC98D", 0}, /* ARM CoreSight Dynamic Replicator */
31 {"ARMHC9CA", 0}, /* ARM CoreSight CATU */
32 {"ARMHC9FF", 0}, /* ARM CoreSight Dynamic Funnel */
36 static void amba_register_dummy_clk(void)
38 static struct clk *amba_dummy_clk;
40 /* If clock already registered */
44 amba_dummy_clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, 0, 0);
45 clk_register_clkdev(amba_dummy_clk, "apb_pclk", NULL);
48 static int amba_handler_attach(struct acpi_device *adev,
49 const struct acpi_device_id *id)
51 struct acpi_device *parent = acpi_dev_parent(adev);
52 struct amba_device *dev;
53 struct resource_entry *rentry;
54 struct list_head resource_list;
55 bool address_found = false;
59 /* If the ACPI node already has a physical device attached, skip it. */
60 if (adev->physical_node_count)
63 dev = amba_device_alloc(dev_name(&adev->dev), 0, 0);
65 dev_err(&adev->dev, "%s(): amba_device_alloc() failed\n",
70 INIT_LIST_HEAD(&resource_list);
71 ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
75 list_for_each_entry(rentry, &resource_list, node) {
76 switch (resource_type(rentry->res)) {
79 dev->res = *rentry->res;
80 dev->res.name = dev_name(&dev->dev);
85 if (irq_no < AMBA_NR_IRQS)
86 dev->irq[irq_no++] = rentry->res->start;
89 dev_warn(&adev->dev, "Invalid resource\n");
94 acpi_dev_free_resource_list(&resource_list);
97 * If the ACPI node has a parent and that parent has a physical device
98 * attached to it, that physical device should be the parent of
99 * the amba device we are about to create.
102 dev->dev.parent = acpi_get_first_physical_node(parent);
104 device_set_node(&dev->dev, acpi_fwnode_handle(adev));
106 ret = amba_device_add(dev, &iomem_resource);
108 dev_err(&adev->dev, "%s(): amba_device_add() failed (%d)\n",
116 amba_device_put(dev);
120 static struct acpi_scan_handler amba_handler = {
122 .attach = amba_handler_attach,
125 void __init acpi_amba_init(void)
127 amba_register_dummy_clk();
128 acpi_scan_add_handler(&amba_handler);