1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Versatile board support using the device tree |
4 | * |
5 | * Copyright (C) 2010 Secret Lab Technologies Ltd. |
6 | * Copyright (C) 2009 Jeremy Kerr <jeremy.kerr@canonical.com> |
7 | * Copyright (C) 2004 ARM Limited |
8 | * Copyright (C) 2000 Deep Blue Solutions Ltd |
9 | */ |
10 | |
11 | #include <linux/init.h> |
12 | #include <linux/io.h> |
13 | #include <linux/of.h> |
14 | #include <linux/of_address.h> |
15 | #include <linux/of_irq.h> |
16 | #include <linux/of_platform.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/amba/bus.h> |
19 | #include <linux/amba/mmci.h> |
20 | #include <asm/mach-types.h> |
21 | #include <asm/mach/arch.h> |
22 | #include <asm/mach/map.h> |
23 | |
24 | /* macro to get at MMIO space when running virtually */ |
25 | #define IO_ADDRESS(x) (((x) & 0x0fffffff) + (((x) >> 4) & 0x0f000000) + 0xf0000000) |
26 | #define __io_address(n) ((void __iomem __force *)IO_ADDRESS(n)) |
27 | |
28 | /* |
29 | * ------------------------------------------------------------------------ |
30 | * Versatile Registers |
31 | * ------------------------------------------------------------------------ |
32 | */ |
33 | #define VERSATILE_SYS_PCICTL_OFFSET 0x44 |
34 | #define VERSATILE_SYS_MCI_OFFSET 0x48 |
35 | |
36 | /* |
37 | * VERSATILE peripheral addresses |
38 | */ |
39 | #define VERSATILE_MMCI0_BASE 0x10005000 /* MMC interface */ |
40 | #define VERSATILE_MMCI1_BASE 0x1000B000 /* MMC Interface */ |
41 | #define VERSATILE_SCTL_BASE 0x101E0000 /* System controller */ |
42 | |
43 | /* |
44 | * System controller bit assignment |
45 | */ |
46 | #define VERSATILE_REFCLK 0 |
47 | #define VERSATILE_TIMCLK 1 |
48 | |
49 | #define VERSATILE_TIMER1_EnSel 15 |
50 | #define VERSATILE_TIMER2_EnSel 17 |
51 | #define VERSATILE_TIMER3_EnSel 19 |
52 | #define VERSATILE_TIMER4_EnSel 21 |
53 | |
54 | static void __iomem *versatile_sys_base; |
55 | |
56 | static unsigned int mmc_status(struct device *dev) |
57 | { |
58 | struct amba_device *adev = container_of(dev, struct amba_device, dev); |
59 | u32 mask; |
60 | |
61 | if (adev->res.start == VERSATILE_MMCI0_BASE) |
62 | mask = 1; |
63 | else |
64 | mask = 2; |
65 | |
66 | return readl(addr: versatile_sys_base + VERSATILE_SYS_MCI_OFFSET) & mask; |
67 | } |
68 | |
69 | static struct mmci_platform_data mmc0_plat_data = { |
70 | .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34, |
71 | .status = mmc_status, |
72 | }; |
73 | |
74 | static struct mmci_platform_data mmc1_plat_data = { |
75 | .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34, |
76 | .status = mmc_status, |
77 | }; |
78 | |
79 | /* |
80 | * Lookup table for attaching a specific name and platform_data pointer to |
81 | * devices as they get created by of_platform_populate(). Ideally this table |
82 | * would not exist, but the current clock implementation depends on some devices |
83 | * having a specific name. |
84 | */ |
85 | struct of_dev_auxdata versatile_auxdata_lookup[] __initdata = { |
86 | OF_DEV_AUXDATA("arm,primecell" , VERSATILE_MMCI0_BASE, "fpga:05" , &mmc0_plat_data), |
87 | OF_DEV_AUXDATA("arm,primecell" , VERSATILE_MMCI1_BASE, "fpga:0b" , &mmc1_plat_data), |
88 | {} |
89 | }; |
90 | |
91 | static struct map_desc versatile_io_desc[] __initdata __maybe_unused = { |
92 | { |
93 | .virtual = IO_ADDRESS(VERSATILE_SCTL_BASE), |
94 | .pfn = __phys_to_pfn(VERSATILE_SCTL_BASE), |
95 | .length = SZ_4K * 9, |
96 | .type = MT_DEVICE |
97 | } |
98 | }; |
99 | |
100 | static void __init versatile_map_io(void) |
101 | { |
102 | debug_ll_io_init(); |
103 | iotable_init(versatile_io_desc, ARRAY_SIZE(versatile_io_desc)); |
104 | } |
105 | |
106 | static void __init versatile_init_early(void) |
107 | { |
108 | u32 val; |
109 | |
110 | /* |
111 | * set clock frequency: |
112 | * VERSATILE_REFCLK is 32KHz |
113 | * VERSATILE_TIMCLK is 1MHz |
114 | */ |
115 | val = readl(__io_address(VERSATILE_SCTL_BASE)); |
116 | writel(val: (VERSATILE_TIMCLK << VERSATILE_TIMER1_EnSel) | |
117 | (VERSATILE_TIMCLK << VERSATILE_TIMER2_EnSel) | |
118 | (VERSATILE_TIMCLK << VERSATILE_TIMER3_EnSel) | |
119 | (VERSATILE_TIMCLK << VERSATILE_TIMER4_EnSel) | val, |
120 | __io_address(VERSATILE_SCTL_BASE)); |
121 | } |
122 | |
123 | static void __init versatile_dt_pci_init(void) |
124 | { |
125 | u32 val; |
126 | struct device_node *np; |
127 | struct property *newprop; |
128 | |
129 | np = of_find_compatible_node(NULL, NULL, compat: "arm,versatile-pci" ); |
130 | if (!np) |
131 | return; |
132 | |
133 | /* Check if PCI backplane is detected */ |
134 | val = readl(addr: versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET); |
135 | if (val & 1) { |
136 | /* |
137 | * Enable PCI accesses. Note that the documentaton is |
138 | * inconsistent whether or not this is needed, but the old |
139 | * driver had it so we will keep it. |
140 | */ |
141 | writel(val: 1, addr: versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET); |
142 | goto out_put_node; |
143 | } |
144 | |
145 | newprop = kzalloc(size: sizeof(*newprop), GFP_KERNEL); |
146 | if (!newprop) |
147 | goto out_put_node; |
148 | |
149 | newprop->name = kstrdup(s: "status" , GFP_KERNEL); |
150 | newprop->value = kstrdup(s: "disabled" , GFP_KERNEL); |
151 | newprop->length = sizeof("disabled" ); |
152 | of_update_property(np, newprop); |
153 | |
154 | pr_info("Not plugged into PCI backplane!\n" ); |
155 | |
156 | out_put_node: |
157 | of_node_put(node: np); |
158 | } |
159 | |
160 | static void __init versatile_dt_init(void) |
161 | { |
162 | struct device_node *np; |
163 | |
164 | np = of_find_compatible_node(NULL, NULL, compat: "arm,core-module-versatile" ); |
165 | if (np) |
166 | versatile_sys_base = of_iomap(node: np, index: 0); |
167 | WARN_ON(!versatile_sys_base); |
168 | |
169 | versatile_dt_pci_init(); |
170 | |
171 | of_platform_default_populate(NULL, lookup: versatile_auxdata_lookup, NULL); |
172 | } |
173 | |
174 | static const char *const versatile_dt_match[] __initconst = { |
175 | "arm,versatile-ab" , |
176 | "arm,versatile-pb" , |
177 | NULL, |
178 | }; |
179 | |
180 | DT_MACHINE_START(VERSATILE_PB, "ARM-Versatile (Device Tree Support)" ) |
181 | .map_io = versatile_map_io, |
182 | .init_early = versatile_init_early, |
183 | .init_machine = versatile_dt_init, |
184 | .dt_compat = versatile_dt_match, |
185 | MACHINE_END |
186 | |