projects/linux·blob master · refs

185 lines · 5.0 KiB

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 <[email protected]>
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
54static void __iomem *versatile_sys_base;
55
56static 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(versatile_sys_base + VERSATILE_SYS_MCI_OFFSET) & mask;
67}
68
69static struct mmci_platform_data mmc0_plat_data = {
70 .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34,
71 .status = mmc_status,
72};
73
74static 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 */
85struct 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
91static 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
100static 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
106static 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((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
123static 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, "arm,versatile-pci");
130 if (!np)
131 return;
132
133 /* Check if PCI backplane is detected */
134 val = readl(versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET);
135 if (val & 1) {
136 /*
137 * Enable PCI accesses. Note that the documentation is
138 * inconsistent whether or not this is needed, but the old
139 * driver had it so we will keep it.
140 */
141 writel(1, versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET);
142 goto out_put_node;
143 }
144
145 newprop = kzalloc_obj(*newprop);
146 if (!newprop)
147 goto out_put_node;
148
149 newprop->name = kstrdup("status", GFP_KERNEL);
150 newprop->value = kstrdup("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
156out_put_node:
157 of_node_put(np);
158}
159
160static void __init versatile_dt_init(void)
161{
162 struct device_node *np;
163
164 np = of_find_compatible_node(NULL, NULL, "arm,core-module-versatile");
165 if (np)
166 versatile_sys_base = of_iomap(np, 0);
167 WARN_ON(!versatile_sys_base);
168
169 versatile_dt_pci_init();
170
171 of_platform_default_populate(NULL, versatile_auxdata_lookup, NULL);
172}
173
174static const char *const versatile_dt_match[] __initconst = {
175 "arm,versatile-ab",
176 "arm,versatile-pb",
177 NULL,
178};
179
180DT_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,
185MACHINE_END