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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 */ | |
1c20a213 SP |
24 | {"ARMHC500", 0}, /* ARM CoreSight ETM4x */ |
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 */ | |
6ce2e188 GG |
33 | {"", 0}, |
34 | }; | |
35 | ||
36 | static void amba_register_dummy_clk(void) | |
37 | { | |
38 | static struct clk *amba_dummy_clk; | |
39 | ||
40 | /* If clock already registered */ | |
41 | if (amba_dummy_clk) | |
42 | return; | |
43 | ||
628e35ba | 44 | amba_dummy_clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, 0, 0); |
6ce2e188 GG |
45 | clk_register_clkdev(amba_dummy_clk, "apb_pclk", NULL); |
46 | } | |
47 | ||
48 | static int amba_handler_attach(struct acpi_device *adev, | |
49 | const struct acpi_device_id *id) | |
50 | { | |
51 | struct amba_device *dev; | |
52 | struct resource_entry *rentry; | |
53 | struct list_head resource_list; | |
54 | bool address_found = false; | |
55 | int irq_no = 0; | |
56 | int ret; | |
57 | ||
58 | /* If the ACPI node already has a physical device attached, skip it. */ | |
59 | if (adev->physical_node_count) | |
60 | return 0; | |
61 | ||
62 | dev = amba_device_alloc(dev_name(&adev->dev), 0, 0); | |
63 | if (!dev) { | |
64 | dev_err(&adev->dev, "%s(): amba_device_alloc() failed\n", | |
65 | __func__); | |
66 | return -ENOMEM; | |
67 | } | |
68 | ||
69 | INIT_LIST_HEAD(&resource_list); | |
70 | ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); | |
71 | if (ret < 0) | |
72 | goto err_free; | |
73 | ||
74 | list_for_each_entry(rentry, &resource_list, node) { | |
75 | switch (resource_type(rentry->res)) { | |
76 | case IORESOURCE_MEM: | |
77 | if (!address_found) { | |
78 | dev->res = *rentry->res; | |
79 | address_found = true; | |
80 | } | |
81 | break; | |
82 | case IORESOURCE_IRQ: | |
83 | if (irq_no < AMBA_NR_IRQS) | |
84 | dev->irq[irq_no++] = rentry->res->start; | |
85 | break; | |
86 | default: | |
87 | dev_warn(&adev->dev, "Invalid resource\n"); | |
88 | break; | |
89 | } | |
90 | } | |
91 | ||
92 | acpi_dev_free_resource_list(&resource_list); | |
93 | ||
94 | /* | |
95 | * If the ACPI node has a parent and that parent has a physical device | |
96 | * attached to it, that physical device should be the parent of | |
97 | * the amba device we are about to create. | |
98 | */ | |
99 | if (adev->parent) | |
100 | dev->dev.parent = acpi_get_first_physical_node(adev->parent); | |
101 | ||
102 | ACPI_COMPANION_SET(&dev->dev, adev); | |
103 | ||
104 | ret = amba_device_add(dev, &iomem_resource); | |
105 | if (ret) { | |
106 | dev_err(&adev->dev, "%s(): amba_device_add() failed (%d)\n", | |
107 | __func__, ret); | |
108 | goto err_free; | |
109 | } | |
110 | ||
111 | return 1; | |
112 | ||
113 | err_free: | |
114 | amba_device_put(dev); | |
115 | return ret; | |
116 | } | |
117 | ||
118 | static struct acpi_scan_handler amba_handler = { | |
119 | .ids = amba_id_list, | |
120 | .attach = amba_handler_attach, | |
121 | }; | |
122 | ||
123 | void __init acpi_amba_init(void) | |
124 | { | |
125 | amba_register_dummy_clk(); | |
126 | acpi_scan_add_handler(&amba_handler); | |
127 | } |