summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/vexpress-sysreg.c
blob: 855c0204f09ae50b4986c13fb54bbbb601b6bc0f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Copyright (C) 2012 ARM Limited
 */

#include <linux/gpio/driver.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/mfd/core.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/platform_data/syscon.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/vexpress.h>

#define SYS_ID			0x000
#define SYS_SW			0x004
#define SYS_LED			0x008
#define SYS_100HZ		0x024
#define SYS_FLAGSSET		0x030
#define SYS_FLAGSCLR		0x034
#define SYS_NVFLAGS		0x038
#define SYS_NVFLAGSSET		0x038
#define SYS_NVFLAGSCLR		0x03c
#define SYS_MCI			0x048
#define SYS_FLASH		0x04c
#define SYS_CFGSW		0x058
#define SYS_24MHZ		0x05c
#define SYS_MISC		0x060
#define SYS_DMA			0x064
#define SYS_PROCID0		0x084
#define SYS_PROCID1		0x088
#define SYS_CFGDATA		0x0a0
#define SYS_CFGCTRL		0x0a4
#define SYS_CFGSTAT		0x0a8

#define SYS_HBI_MASK		0xfff
#define SYS_PROCIDx_HBI_SHIFT	0

#define SYS_MISC_MASTERSITE	(1 << 14)

void vexpress_flags_set(u32 data)
{
	static void __iomem *base;

	if (!base) {
		struct device_node *node = of_find_compatible_node(NULL, NULL,
				"arm,vexpress-sysreg");

		base = of_iomap(node, 0);
	}

	if (WARN_ON(!base))
		return;

	writel(~0, base + SYS_FLAGSCLR);
	writel(data, base + SYS_FLAGSSET);
}

/* The sysreg block is just a random collection of various functions... */

static struct syscon_platform_data vexpress_sysreg_sys_id_pdata = {
	.label = "sys_id",
};

static struct bgpio_pdata vexpress_sysreg_sys_led_pdata = {
	.label = "sys_led",
	.base = -1,
	.ngpio = 8,
};

static struct bgpio_pdata vexpress_sysreg_sys_mci_pdata = {
	.label = "sys_mci",
	.base = -1,
	.ngpio = 2,
};

static struct bgpio_pdata vexpress_sysreg_sys_flash_pdata = {
	.label = "sys_flash",
	.base = -1,
	.ngpio = 1,
};

static struct syscon_platform_data vexpress_sysreg_sys_misc_pdata = {
	.label = "sys_misc",
};

static struct syscon_platform_data vexpress_sysreg_sys_procid_pdata = {
	.label = "sys_procid",
};

static struct mfd_cell vexpress_sysreg_cells[] = {
	{
		.name = "syscon",
		.num_resources = 1,
		.resources = (struct resource []) {
			DEFINE_RES_MEM(SYS_ID, 0x4),
		},
		.platform_data = &vexpress_sysreg_sys_id_pdata,
		.pdata_size = sizeof(vexpress_sysreg_sys_id_pdata),
	}, {
		.name = "basic-mmio-gpio",
		.of_compatible = "arm,vexpress-sysreg,sys_led",
		.num_resources = 1,
		.resources = (struct resource []) {
			DEFINE_RES_MEM_NAMED(SYS_LED, 0x4, "dat"),
		},
		.platform_data = &vexpress_sysreg_sys_led_pdata,
		.pdata_size = sizeof(vexpress_sysreg_sys_led_pdata),
	}, {
		.name = "basic-mmio-gpio",
		.of_compatible = "arm,vexpress-sysreg,sys_mci",
		.num_resources = 1,
		.resources = (struct resource []) {
			DEFINE_RES_MEM_NAMED(SYS_MCI, 0x4, "dat"),
		},
		.platform_data = &vexpress_sysreg_sys_mci_pdata,
		.pdata_size = sizeof(vexpress_sysreg_sys_mci_pdata),
	}, {
		.name = "basic-mmio-gpio",
		.of_compatible = "arm,vexpress-sysreg,sys_flash",
		.num_resources = 1,
		.resources = (struct resource []) {
			DEFINE_RES_MEM_NAMED(SYS_FLASH, 0x4, "dat"),
		},
		.platform_data = &vexpress_sysreg_sys_flash_pdata,
		.pdata_size = sizeof(vexpress_sysreg_sys_flash_pdata),
	}, {
		.name = "syscon",
		.num_resources = 1,
		.resources = (struct resource []) {
			DEFINE_RES_MEM(SYS_MISC, 0x4),
		},
		.platform_data = &vexpress_sysreg_sys_misc_pdata,
		.pdata_size = sizeof(vexpress_sysreg_sys_misc_pdata),
	}, {
		.name = "syscon",
		.num_resources = 1,
		.resources = (struct resource []) {
			DEFINE_RES_MEM(SYS_PROCID0, 0x8),
		},
		.platform_data = &vexpress_sysreg_sys_procid_pdata,
		.pdata_size = sizeof(vexpress_sysreg_sys_procid_pdata),
	}, {
		.name = "vexpress-syscfg",
		.num_resources = 1,
		.resources = (struct resource []) {
			DEFINE_RES_MEM(SYS_CFGDATA, 0xc),
		},
	}
};

static int vexpress_sysreg_probe(struct platform_device *pdev)
{
	struct resource *mem;
	void __iomem *base;
	struct gpio_chip *mmc_gpio_chip;
	int master;
	u32 dt_hbi;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem)
		return -EINVAL;

	base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
	if (!base)
		return -ENOMEM;

	master = readl(base + SYS_MISC) & SYS_MISC_MASTERSITE ?
			VEXPRESS_SITE_DB2 : VEXPRESS_SITE_DB1;
	vexpress_config_set_master(master);

	/* Confirm board type against DT property, if available */
	if (of_property_read_u32(of_root, "arm,hbi", &dt_hbi) == 0) {
		u32 id = readl(base + (master == VEXPRESS_SITE_DB1 ?
				 SYS_PROCID0 : SYS_PROCID1));
		u32 hbi = (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK;

		if (WARN_ON(dt_hbi != hbi))
			dev_warn(&pdev->dev, "DT HBI (%x) is not matching hardware (%x)!\n",
					dt_hbi, hbi);
	}

	/*
	 * Duplicated SYS_MCI pseudo-GPIO controller for compatibility with
	 * older trees using sysreg node for MMC control lines.
	 */
	mmc_gpio_chip = devm_kzalloc(&pdev->dev, sizeof(*mmc_gpio_chip),
			GFP_KERNEL);
	if (!mmc_gpio_chip)
		return -ENOMEM;
	bgpio_init(mmc_gpio_chip, &pdev->dev, 0x4, base + SYS_MCI,
			NULL, NULL, NULL, NULL, 0);
	mmc_gpio_chip->ngpio = 2;
	gpiochip_add(mmc_gpio_chip);

	return mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
			vexpress_sysreg_cells,
			ARRAY_SIZE(vexpress_sysreg_cells), mem, 0, NULL);
}

static const struct of_device_id vexpress_sysreg_match[] = {
	{ .compatible = "arm,vexpress-sysreg", },
	{},
};

static struct platform_driver vexpress_sysreg_driver = {
	.driver = {
		.name = "vexpress-sysreg",
		.of_match_table = vexpress_sysreg_match,
	},
	.probe = vexpress_sysreg_probe,
};

static int __init vexpress_sysreg_init(void)
{
	struct device_node *node;

	/* Need the sysreg early, before any other device... */
	for_each_matching_node(node, vexpress_sysreg_match)
		of_platform_device_create(node, NULL, NULL);

	return platform_driver_register(&vexpress_sysreg_driver);
}
core_initcall(vexpress_sysreg_init);
OpenPOWER on IntegriCloud