projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 6ce2e188 GG |
2 | |
| 3 | /* | |
| 4 | * ACPI support for platform bus type. | |
| 5 | * | |
| 6 | * Copyright (C) 2015, Linaro Ltd | |
| 7 | * Author: Graeme Gregory <graeme.gregory@linaro.org> | |
| 6ce2e188 GG |
8 | */ |
| 9 | ||
| 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> | |
| 19 | ||
| 20 | #include "internal.h" | |
| 21 | ||
| 22 | static const struct acpi_device_id amba_id_list[] = { | |
| 23 | {"ARMH0061", 0}, /* PL061 GPIO Device */ | |
| 53e7380c | 24 | {"ARMH0330", 0}, /* ARM DMA Controller DMA-330 */ |
| 1c20a213 SP |
25 | {"ARMHC500", 0}, /* ARM CoreSight ETM4x */ |
| 26 | {"ARMHC501", 0}, /* ARM CoreSight ETR */ | |
| 27 | {"ARMHC502", 0}, /* ARM CoreSight STM */ | |
| 28 | {"ARMHC503", 0}, /* ARM CoreSight Debug */ | |
| 29 | {"ARMHC979", 0}, /* ARM CoreSight TPIU */ | |
| 30 | {"ARMHC97C", 0}, /* ARM CoreSight SoC-400 TMC, SoC-600 ETF/ETB */ | |
| 31 | {"ARMHC98D", 0}, /* ARM CoreSight Dynamic Replicator */ | |
| 32 | {"ARMHC9CA", 0}, /* ARM CoreSight CATU */ | |
| 33 | {"ARMHC9FF", 0}, /* ARM CoreSight Dynamic Funnel */ | |
| 6ce2e188 GG |
34 | {"", 0}, |
| 35 | }; | |
| 36 | ||
| 37 | static void amba_register_dummy_clk(void) | |
| 38 | { | |
| 39 | static struct clk *amba_dummy_clk; | |
| 40 | ||
| 41 | /* If clock already registered */ | |
| 42 | if (amba_dummy_clk) | |
| 43 | return; | |
| 44 | ||
| 628e35ba | 45 | amba_dummy_clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, 0, 0); |
| 6ce2e188 GG |
46 | clk_register_clkdev(amba_dummy_clk, "apb_pclk", NULL); |
| 47 | } | |
| 48 | ||
| 49 | static int amba_handler_attach(struct acpi_device *adev, | |
| 50 | const struct acpi_device_id *id) | |
| 51 | { | |
| 62fcb99b | 52 | struct acpi_device *parent = acpi_dev_parent(adev); |
| 6ce2e188 GG |
53 | struct amba_device *dev; |
| 54 | struct resource_entry *rentry; | |
| 55 | struct list_head resource_list; | |
| 56 | bool address_found = false; | |
| 57 | int irq_no = 0; | |
| 58 | int ret; | |
| 59 | ||
| 60 | /* If the ACPI node already has a physical device attached, skip it. */ | |
| 61 | if (adev->physical_node_count) | |
| 62 | return 0; | |
| 63 | ||
| 64 | dev = amba_device_alloc(dev_name(&adev->dev), 0, 0); | |
| 65 | if (!dev) { | |
| 66 | dev_err(&adev->dev, "%s(): amba_device_alloc() failed\n", | |
| 67 | __func__); | |
| 68 | return -ENOMEM; | |
| 69 | } | |
| 70 | ||
| 71 | INIT_LIST_HEAD(&resource_list); | |
| 72 | ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); | |
| 73 | if (ret < 0) | |
| 74 | goto err_free; | |
| 75 | ||
| 76 | list_for_each_entry(rentry, &resource_list, node) { | |
| 77 | switch (resource_type(rentry->res)) { | |
| 78 | case IORESOURCE_MEM: | |
| 79 | if (!address_found) { | |
| 80 | dev->res = *rentry->res; | |
| 77186294 | 81 | dev->res.name = dev_name(&dev->dev); |
| 6ce2e188 GG |
82 | address_found = true; |
| 83 | } | |
| 84 | break; | |
| 85 | case IORESOURCE_IRQ: | |
| 86 | if (irq_no < AMBA_NR_IRQS) | |
| 87 | dev->irq[irq_no++] = rentry->res->start; | |
| 88 | break; | |
| 89 | default: | |
| 90 | dev_warn(&adev->dev, "Invalid resource\n"); | |
| 91 | break; | |
| 92 | } | |
| 93 | } | |
| 94 | ||
| 95 | acpi_dev_free_resource_list(&resource_list); | |
| 96 | ||
| 97 | /* | |
| 98 | * If the ACPI node has a parent and that parent has a physical device | |
| 99 | * attached to it, that physical device should be the parent of | |
| 100 | * the amba device we are about to create. | |
| 101 | */ | |
| 62fcb99b RW |
102 | if (parent) |
| 103 | dev->dev.parent = acpi_get_first_physical_node(parent); | |
| 6ce2e188 GG |
104 | |
| 105 | ACPI_COMPANION_SET(&dev->dev, adev); | |
| 106 | ||
| 107 | ret = amba_device_add(dev, &iomem_resource); | |
| 108 | if (ret) { | |
| 109 | dev_err(&adev->dev, "%s(): amba_device_add() failed (%d)\n", | |
| 110 | __func__, ret); | |
| 111 | goto err_free; | |
| 112 | } | |
| 113 | ||
| 114 | return 1; | |
| 115 | ||
| 116 | err_free: | |
| 117 | amba_device_put(dev); | |
| 118 | return ret; | |
| 119 | } | |
| 120 | ||
| 121 | static struct acpi_scan_handler amba_handler = { | |
| 122 | .ids = amba_id_list, | |
| 123 | .attach = amba_handler_attach, | |
| 124 | }; | |
| 125 | ||
| 126 | void __init acpi_amba_init(void) | |
| 127 | { | |
| 128 | amba_register_dummy_clk(); | |
| 129 | acpi_scan_add_handler(&amba_handler); | |
| 130 | } |