aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips
diff options
context:
space:
mode:
authorGabor Juhos <juhosg@openwrt.org>2011-01-04 15:28:15 -0500
committerRalf Baechle <ralf@linux-mips.org>2011-01-18 13:30:25 -0500
commit6eae43c57ee92de91f6cc7c391cea97c43295da0 (patch)
tree5ac5521d28527e6218faea0f31cc888df65dbc9f /arch/mips
parentd4a67d9dc8a5a80c4ec1814791af8c0252c158b8 (diff)
MIPS: ath79: add GPIOLIB support
This patch implements generic GPIO routines for the built-in GPIO controllers of the Atheros AR71XX/AR724X/AR913X SoCs. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Signed-off-by: Imre Kaloz <kaloz@openwrt.org> Cc: David Brownell <dbrownell@users.sourceforge.net> Cc: linux-mips@linux-mips.org Cc: Luis R. Rodriguez <lrodriguez@atheros.com> Cc: Cliff Holden <Cliff.Holden@Atheros.com> Cc: Kathy Giori <Kathy.Giori@Atheros.com> Patchwork: https://patchwork.linux-mips.org/patch/1948/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/Kconfig1
-rw-r--r--arch/mips/ath79/Makefile2
-rw-r--r--arch/mips/ath79/common.h5
-rw-r--r--arch/mips/ath79/gpio.c197
-rw-r--r--arch/mips/ath79/setup.c2
-rw-r--r--arch/mips/include/asm/mach-ath79/ar71xx_regs.h21
-rw-r--r--arch/mips/include/asm/mach-ath79/gpio.h26
7 files changed, 252 insertions, 2 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index e0215d93df82..02d3cd4b124c 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -68,6 +68,7 @@ config AR7
68 68
69config ATH79 69config ATH79
70 bool "Atheros AR71XX/AR724X/AR913X based boards" 70 bool "Atheros AR71XX/AR724X/AR913X based boards"
71 select ARCH_REQUIRE_GPIOLIB
71 select BOOT_RAW 72 select BOOT_RAW
72 select CEVT_R4K 73 select CEVT_R4K
73 select CSRC_R4K 74 select CSRC_R4K
diff --git a/arch/mips/ath79/Makefile b/arch/mips/ath79/Makefile
index 31e0f83ddf68..e621d6c464c1 100644
--- a/arch/mips/ath79/Makefile
+++ b/arch/mips/ath79/Makefile
@@ -8,7 +8,7 @@
8# under the terms of the GNU General Public License version 2 as published 8# under the terms of the GNU General Public License version 2 as published
9# by the Free Software Foundation. 9# by the Free Software Foundation.
10 10
11obj-y := prom.o setup.o irq.o common.o clock.o 11obj-y := prom.o setup.o irq.o common.o clock.o gpio.o
12 12
13obj-$(CONFIG_EARLY_PRINTK) += early_printk.o 13obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
14 14
diff --git a/arch/mips/ath79/common.h b/arch/mips/ath79/common.h
index 612a6b5d8702..561906c2345e 100644
--- a/arch/mips/ath79/common.h
+++ b/arch/mips/ath79/common.h
@@ -23,4 +23,9 @@
23void ath79_clocks_init(void); 23void ath79_clocks_init(void);
24void ath79_ddr_wb_flush(unsigned int reg); 24void ath79_ddr_wb_flush(unsigned int reg);
25 25
26void ath79_gpio_function_enable(u32 mask);
27void ath79_gpio_function_disable(u32 mask);
28void ath79_gpio_function_setup(u32 set, u32 clear);
29void ath79_gpio_init(void);
30
26#endif /* __ATH79_COMMON_H */ 31#endif /* __ATH79_COMMON_H */
diff --git a/arch/mips/ath79/gpio.c b/arch/mips/ath79/gpio.c
new file mode 100644
index 000000000000..a0c426b82123
--- /dev/null
+++ b/arch/mips/ath79/gpio.c
@@ -0,0 +1,197 @@
1/*
2 * Atheros AR71XX/AR724X/AR913X GPIO API support
3 *
4 * Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation.
10 */
11
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/types.h>
16#include <linux/spinlock.h>
17#include <linux/io.h>
18#include <linux/ioport.h>
19#include <linux/gpio.h>
20
21#include <asm/mach-ath79/ar71xx_regs.h>
22#include <asm/mach-ath79/ath79.h>
23#include "common.h"
24
25static void __iomem *ath79_gpio_base;
26static unsigned long ath79_gpio_count;
27static DEFINE_SPINLOCK(ath79_gpio_lock);
28
29static void __ath79_gpio_set_value(unsigned gpio, int value)
30{
31 void __iomem *base = ath79_gpio_base;
32
33 if (value)
34 __raw_writel(1 << gpio, base + AR71XX_GPIO_REG_SET);
35 else
36 __raw_writel(1 << gpio, base + AR71XX_GPIO_REG_CLEAR);
37}
38
39static int __ath79_gpio_get_value(unsigned gpio)
40{
41 return (__raw_readl(ath79_gpio_base + AR71XX_GPIO_REG_IN) >> gpio) & 1;
42}
43
44static int ath79_gpio_get_value(struct gpio_chip *chip, unsigned offset)
45{
46 return __ath79_gpio_get_value(offset);
47}
48
49static void ath79_gpio_set_value(struct gpio_chip *chip,
50 unsigned offset, int value)
51{
52 __ath79_gpio_set_value(offset, value);
53}
54
55static int ath79_gpio_direction_input(struct gpio_chip *chip,
56 unsigned offset)
57{
58 void __iomem *base = ath79_gpio_base;
59 unsigned long flags;
60
61 spin_lock_irqsave(&ath79_gpio_lock, flags);
62
63 __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) & ~(1 << offset),
64 base + AR71XX_GPIO_REG_OE);
65
66 spin_unlock_irqrestore(&ath79_gpio_lock, flags);
67
68 return 0;
69}
70
71static int ath79_gpio_direction_output(struct gpio_chip *chip,
72 unsigned offset, int value)
73{
74 void __iomem *base = ath79_gpio_base;
75 unsigned long flags;
76
77 spin_lock_irqsave(&ath79_gpio_lock, flags);
78
79 if (value)
80 __raw_writel(1 << offset, base + AR71XX_GPIO_REG_SET);
81 else
82 __raw_writel(1 << offset, base + AR71XX_GPIO_REG_CLEAR);
83
84 __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) | (1 << offset),
85 base + AR71XX_GPIO_REG_OE);
86
87 spin_unlock_irqrestore(&ath79_gpio_lock, flags);
88
89 return 0;
90}
91
92static struct gpio_chip ath79_gpio_chip = {
93 .label = "ath79",
94 .get = ath79_gpio_get_value,
95 .set = ath79_gpio_set_value,
96 .direction_input = ath79_gpio_direction_input,
97 .direction_output = ath79_gpio_direction_output,
98 .base = 0,
99};
100
101void ath79_gpio_function_enable(u32 mask)
102{
103 void __iomem *base = ath79_gpio_base;
104 unsigned long flags;
105
106 spin_lock_irqsave(&ath79_gpio_lock, flags);
107
108 __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_FUNC) | mask,
109 base + AR71XX_GPIO_REG_FUNC);
110 /* flush write */
111 __raw_readl(base + AR71XX_GPIO_REG_FUNC);
112
113 spin_unlock_irqrestore(&ath79_gpio_lock, flags);
114}
115
116void ath79_gpio_function_disable(u32 mask)
117{
118 void __iomem *base = ath79_gpio_base;
119 unsigned long flags;
120
121 spin_lock_irqsave(&ath79_gpio_lock, flags);
122
123 __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_FUNC) & ~mask,
124 base + AR71XX_GPIO_REG_FUNC);
125 /* flush write */
126 __raw_readl(base + AR71XX_GPIO_REG_FUNC);
127
128 spin_unlock_irqrestore(&ath79_gpio_lock, flags);
129}
130
131void ath79_gpio_function_setup(u32 set, u32 clear)
132{
133 void __iomem *base = ath79_gpio_base;
134 unsigned long flags;
135
136 spin_lock_irqsave(&ath79_gpio_lock, flags);
137
138 __raw_writel((__raw_readl(base + AR71XX_GPIO_REG_FUNC) & ~clear) | set,
139 base + AR71XX_GPIO_REG_FUNC);
140 /* flush write */
141 __raw_readl(base + AR71XX_GPIO_REG_FUNC);
142
143 spin_unlock_irqrestore(&ath79_gpio_lock, flags);
144}
145
146void __init ath79_gpio_init(void)
147{
148 int err;
149
150 if (soc_is_ar71xx())
151 ath79_gpio_count = AR71XX_GPIO_COUNT;
152 else if (soc_is_ar724x())
153 ath79_gpio_count = AR724X_GPIO_COUNT;
154 else if (soc_is_ar913x())
155 ath79_gpio_count = AR913X_GPIO_COUNT;
156 else
157 BUG();
158
159 ath79_gpio_base = ioremap_nocache(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE);
160 ath79_gpio_chip.ngpio = ath79_gpio_count;
161
162 err = gpiochip_add(&ath79_gpio_chip);
163 if (err)
164 panic("cannot add AR71xx GPIO chip, error=%d", err);
165}
166
167int gpio_get_value(unsigned gpio)
168{
169 if (gpio < ath79_gpio_count)
170 return __ath79_gpio_get_value(gpio);
171
172 return __gpio_get_value(gpio);
173}
174EXPORT_SYMBOL(gpio_get_value);
175
176void gpio_set_value(unsigned gpio, int value)
177{
178 if (gpio < ath79_gpio_count)
179 __ath79_gpio_set_value(gpio, value);
180 else
181 __gpio_set_value(gpio, value);
182}
183EXPORT_SYMBOL(gpio_set_value);
184
185int gpio_to_irq(unsigned gpio)
186{
187 /* FIXME */
188 return -EINVAL;
189}
190EXPORT_SYMBOL(gpio_to_irq);
191
192int irq_to_gpio(unsigned irq)
193{
194 /* FIXME */
195 return -EINVAL;
196}
197EXPORT_SYMBOL(irq_to_gpio);
diff --git a/arch/mips/ath79/setup.c b/arch/mips/ath79/setup.c
index 175def860165..29dde98f49ed 100644
--- a/arch/mips/ath79/setup.c
+++ b/arch/mips/ath79/setup.c
@@ -157,7 +157,6 @@ void __init plat_mem_setup(void)
157 AR71XX_RESET_SIZE); 157 AR71XX_RESET_SIZE);
158 ath79_pll_base = ioremap_nocache(AR71XX_PLL_BASE, 158 ath79_pll_base = ioremap_nocache(AR71XX_PLL_BASE,
159 AR71XX_PLL_SIZE); 159 AR71XX_PLL_SIZE);
160
161 ath79_ddr_base = ioremap_nocache(AR71XX_DDR_CTRL_BASE, 160 ath79_ddr_base = ioremap_nocache(AR71XX_DDR_CTRL_BASE,
162 AR71XX_DDR_CTRL_SIZE); 161 AR71XX_DDR_CTRL_SIZE);
163 162
@@ -183,6 +182,7 @@ void __init plat_time_init(void)
183 182
184static int __init ath79_setup(void) 183static int __init ath79_setup(void)
185{ 184{
185 ath79_gpio_init();
186 ath79_register_uart(); 186 ath79_register_uart();
187 return 0; 187 return 0;
188} 188}
diff --git a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
index 5a9e5e179463..7f2933d8b935 100644
--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
@@ -25,6 +25,8 @@
25#define AR71XX_DDR_CTRL_SIZE 0x100 25#define AR71XX_DDR_CTRL_SIZE 0x100
26#define AR71XX_UART_BASE (AR71XX_APB_BASE + 0x00020000) 26#define AR71XX_UART_BASE (AR71XX_APB_BASE + 0x00020000)
27#define AR71XX_UART_SIZE 0x100 27#define AR71XX_UART_SIZE 0x100
28#define AR71XX_GPIO_BASE (AR71XX_APB_BASE + 0x00040000)
29#define AR71XX_GPIO_SIZE 0x100
28#define AR71XX_PLL_BASE (AR71XX_APB_BASE + 0x00050000) 30#define AR71XX_PLL_BASE (AR71XX_APB_BASE + 0x00050000)
29#define AR71XX_PLL_SIZE 0x100 31#define AR71XX_PLL_SIZE 0x100
30#define AR71XX_RESET_BASE (AR71XX_APB_BASE + 0x00060000) 32#define AR71XX_RESET_BASE (AR71XX_APB_BASE + 0x00060000)
@@ -204,4 +206,23 @@
204#define AR71XX_SPI_IOC_CS_ALL (AR71XX_SPI_IOC_CS0 | AR71XX_SPI_IOC_CS1 | \ 206#define AR71XX_SPI_IOC_CS_ALL (AR71XX_SPI_IOC_CS0 | AR71XX_SPI_IOC_CS1 | \
205 AR71XX_SPI_IOC_CS2) 207 AR71XX_SPI_IOC_CS2)
206 208
209/*
210 * GPIO block
211 */
212#define AR71XX_GPIO_REG_OE 0x00
213#define AR71XX_GPIO_REG_IN 0x04
214#define AR71XX_GPIO_REG_OUT 0x08
215#define AR71XX_GPIO_REG_SET 0x0c
216#define AR71XX_GPIO_REG_CLEAR 0x10
217#define AR71XX_GPIO_REG_INT_MODE 0x14
218#define AR71XX_GPIO_REG_INT_TYPE 0x18
219#define AR71XX_GPIO_REG_INT_POLARITY 0x1c
220#define AR71XX_GPIO_REG_INT_PENDING 0x20
221#define AR71XX_GPIO_REG_INT_ENABLE 0x24
222#define AR71XX_GPIO_REG_FUNC 0x28
223
224#define AR71XX_GPIO_COUNT 16
225#define AR724X_GPIO_COUNT 18
226#define AR913X_GPIO_COUNT 22
227
207#endif /* __ASM_MACH_AR71XX_REGS_H */ 228#endif /* __ASM_MACH_AR71XX_REGS_H */
diff --git a/arch/mips/include/asm/mach-ath79/gpio.h b/arch/mips/include/asm/mach-ath79/gpio.h
new file mode 100644
index 000000000000..60dcb62785b4
--- /dev/null
+++ b/arch/mips/include/asm/mach-ath79/gpio.h
@@ -0,0 +1,26 @@
1/*
2 * Atheros AR71XX/AR724X/AR913X GPIO API definitions
3 *
4 * Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation.
10 *
11 */
12
13#ifndef __ASM_MACH_ATH79_GPIO_H
14#define __ASM_MACH_ATH79_GPIO_H
15
16#define ARCH_NR_GPIOS 64
17#include <asm-generic/gpio.h>
18
19int gpio_to_irq(unsigned gpio);
20int irq_to_gpio(unsigned irq);
21int gpio_get_value(unsigned gpio);
22void gpio_set_value(unsigned gpio, int value);
23
24#define gpio_cansleep __gpio_cansleep
25
26#endif /* __ASM_MACH_ATH79_GPIO_H */