aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/ramips/patches-3.10/0506-GPIO-ralink-add-mt7621-gpio-controller.patch
blob: d783d261ab5acb3484d61c7c668874bb1863b370 (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
From e19957560170d63c6a5f0b1d7ba63695e4d1f033 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Mon, 2 Dec 2013 16:14:28 +0100
Subject: [PATCH 506/507] GPIO: ralink: add mt7621 gpio controller

Signed-off-by: John Crispin <blogic@openwrt.org>
---
 arch/mips/Kconfig          |    1 +
 drivers/gpio/Kconfig       |    6 ++
 drivers/gpio/Makefile      |    1 +
 drivers/gpio/gpio-mt7621.c |  183 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 191 insertions(+)
 create mode 100644 drivers/gpio/gpio-mt7621.c

--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -710,6 +710,12 @@ config GPIO_MSIC
 	  Enable support for GPIO on intel MSIC controllers found in
 	  intel MID devices
 
+config GPIO_MT7621
+	bool "Mediatek GPIO Support"
+	depends on RALINK && SOC_MT7621
+	help
+	  Say yes here to support the Mediatek SoC GPIO device
+
 comment "USB GPIO expanders:"
 
 config GPIO_VIPERBOARD
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -88,3 +88,4 @@ obj-$(CONFIG_GPIO_WM831X)	+= gpio-wm831x
 obj-$(CONFIG_GPIO_WM8350)	+= gpio-wm8350.o
 obj-$(CONFIG_GPIO_WM8994)	+= gpio-wm8994.o
 obj-$(CONFIG_GPIO_XILINX)	+= gpio-xilinx.o
+obj-$(CONFIG_GPIO_MT7621)	+= gpio-mt7621.o
--- /dev/null
+++ b/drivers/gpio/gpio-mt7621.c
@@ -0,0 +1,183 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/of_irq.h>
+#include <linux/spinlock.h>
+#include <linux/irqdomain.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#define MTK_BANK_WIDTH		32
+
+enum mediatek_gpio_reg {
+	GPIO_REG_CTRL = 0,
+	GPIO_REG_POL,
+	GPIO_REG_DATA,
+	GPIO_REG_DSET,
+	GPIO_REG_DCLR,
+};
+
+static void __iomem *mtk_gc_membase;
+
+struct mtk_gc {
+	struct gpio_chip chip;
+	spinlock_t lock;
+	int bank;
+};
+
+int
+gpio_to_irq(unsigned gpio)
+{
+	return -1;
+}
+
+static inline struct mtk_gc
+*to_mediatek_gpio(struct gpio_chip *chip)
+{
+	struct mtk_gc *mgc;
+
+	mgc = container_of(chip, struct mtk_gc, chip);
+
+	return mgc;
+}
+
+static inline void
+mtk_gpio_w32(struct mtk_gc *rg, u8 reg, u32 val)
+{
+	iowrite32(val, mtk_gc_membase + (reg * 0x10) + (rg->bank * 0x4));
+}
+
+static inline u32
+mtk_gpio_r32(struct mtk_gc *rg, u8 reg)
+{
+	return ioread32(mtk_gc_membase + (reg * 0x10) + (rg->bank * 0x4));
+}
+
+static void
+mediatek_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct mtk_gc *rg = to_mediatek_gpio(chip);
+
+	mtk_gpio_w32(rg, (value) ? GPIO_REG_DSET : GPIO_REG_DCLR, BIT(offset));
+}
+
+static int
+mediatek_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct mtk_gc *rg = to_mediatek_gpio(chip);
+
+	return !!(mtk_gpio_r32(rg, GPIO_REG_DATA) & BIT(offset));
+}
+
+static int
+mediatek_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	struct mtk_gc *rg = to_mediatek_gpio(chip);
+	unsigned long flags;
+	u32 t;
+
+	spin_lock_irqsave(&rg->lock, flags);
+	t = mtk_gpio_r32(rg, GPIO_REG_CTRL);
+	t &= ~BIT(offset);
+	mtk_gpio_w32(rg, GPIO_REG_CTRL, t);
+	spin_unlock_irqrestore(&rg->lock, flags);
+
+	return 0;
+}
+
+static int
+mediatek_gpio_direction_output(struct gpio_chip *chip,
+					unsigned offset, int value)
+{
+	struct mtk_gc *rg = to_mediatek_gpio(chip);
+	unsigned long flags;
+	u32 t;
+
+	spin_lock_irqsave(&rg->lock, flags);
+	t = mtk_gpio_r32(rg, GPIO_REG_CTRL);
+	t |= BIT(offset);
+	mtk_gpio_w32(rg, GPIO_REG_CTRL, t);
+	mediatek_gpio_set(chip, offset, value);
+	spin_unlock_irqrestore(&rg->lock, flags);
+
+	return 0;
+}
+
+static int
+mediatek_gpio_bank_probe(struct platform_device *pdev, struct device_node *bank)
+{
+	const __be32 *id = of_get_property(bank, "reg", NULL);
+	struct mtk_gc *rg = devm_kzalloc(&pdev->dev,
+				sizeof(struct mtk_gc), GFP_KERNEL);
+	if (!rg || !id)
+		return -ENOMEM;
+
+	spin_lock_init(&rg->lock);
+
+	rg->chip.dev = &pdev->dev;
+	rg->chip.label = dev_name(&pdev->dev);
+	rg->chip.of_node = bank;
+	rg->chip.base = MTK_BANK_WIDTH * be32_to_cpu(*id);
+	rg->chip.ngpio = MTK_BANK_WIDTH;
+	rg->chip.direction_input = mediatek_gpio_direction_input;
+	rg->chip.direction_output = mediatek_gpio_direction_output;
+	rg->chip.get = mediatek_gpio_get;
+	rg->chip.set = mediatek_gpio_set;
+
+	/* set polarity to low for all gpios */
+	mtk_gpio_w32(rg, GPIO_REG_POL, 0);
+
+	dev_info(&pdev->dev, "registering %d gpios\n", rg->chip.ngpio);
+
+	return gpiochip_add(&rg->chip);
+}
+
+static int
+mediatek_gpio_probe(struct platform_device *pdev)
+{
+	struct device_node *bank, *np = pdev->dev.of_node;
+	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	mtk_gc_membase = devm_request_and_ioremap(&pdev->dev, res);
+	if (IS_ERR(mtk_gc_membase))
+		return PTR_ERR(mtk_gc_membase);
+
+	for_each_child_of_node(np, bank)
+		if (of_device_is_compatible(bank, "mtk,mt7621-gpio-bank"))
+			mediatek_gpio_bank_probe(pdev, bank);
+
+	return 0;
+}
+
+static const struct of_device_id mediatek_gpio_match[] = {
+	{ .compatible = "mtk,mt7621-gpio" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mediatek_gpio_match);
+
+static struct platform_driver mediatek_gpio_driver = {
+	.probe = mediatek_gpio_probe,
+	.driver = {
+		.name = "mt7621_gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = mediatek_gpio_match,
+	},
+};
+
+static int __init
+mediatek_gpio_init(void)
+{
+	return platform_driver_register(&mediatek_gpio_driver);
+}
+
+subsys_initcall(mediatek_gpio_init);