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authorJuergen Beisert <j.beisert@pengutronix.de>2008-07-05 04:02:55 -0400
committerRobert Schwebel <r.schwebel@pengutronix.de>2008-07-05 04:02:55 -0400
commitaa10abd381b9493a88f6b9e111adc79e33d548fa (patch)
tree59632a2283057cc671e82cdb32542fa796c3e3fc /arch
parent259bcaae9a2f28d7e3303b202b64a1fb0a9ab9e4 (diff)
i.MX2 family: Add GPIO multiplexing support
This patch adds GPIO multiplexing support for the imx1/mxc2 family of procesors. Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/plat-mxc/Makefile2
-rw-r--r--arch/arm/plat-mxc/iomux-mx1-mx2.c156
2 files changed, 158 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
index e3cc25c6d46f..db66e9ae8414 100644
--- a/arch/arm/plat-mxc/Makefile
+++ b/arch/arm/plat-mxc/Makefile
@@ -4,3 +4,5 @@
4 4
5# Common support 5# Common support
6obj-y := irq.o clock.o gpio.o time.o 6obj-y := irq.o clock.o gpio.o time.o
7
8obj-$(CONFIG_ARCH_MX2) += iomux-mx1-mx2.o
diff --git a/arch/arm/plat-mxc/iomux-mx1-mx2.c b/arch/arm/plat-mxc/iomux-mx1-mx2.c
new file mode 100644
index 000000000000..1985571eb40c
--- /dev/null
+++ b/arch/arm/plat-mxc/iomux-mx1-mx2.c
@@ -0,0 +1,156 @@
1/*
2 * arch/arm/mach-mxc/generic.c
3 *
4 * author: Sascha Hauer
5 * Created: april 20th, 2004
6 * Copyright: Synertronixx GmbH
7 *
8 * Common code for i.MX machines
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 */
25
26#include <linux/errno.h>
27#include <linux/init.h>
28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/string.h>
31#include <linux/gpio.h>
32
33#include <asm/hardware.h>
34#include <asm/mach/map.h>
35#include <asm/arch/iomux-mx1-mx2.h>
36
37void mxc_gpio_mode(int gpio_mode)
38{
39 unsigned int pin = gpio_mode & GPIO_PIN_MASK;
40 unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
41 unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
42 unsigned int tmp;
43
44 /* Pullup enable */
45 tmp = __raw_readl(VA_GPIO_BASE + MXC_PUEN(port));
46 if (gpio_mode & GPIO_PUEN)
47 tmp |= (1 << pin);
48 else
49 tmp &= ~(1 << pin);
50 __raw_writel(tmp, VA_GPIO_BASE + MXC_PUEN(port));
51
52 /* Data direction */
53 tmp = __raw_readl(VA_GPIO_BASE + MXC_DDIR(port));
54 if (gpio_mode & GPIO_OUT)
55 tmp |= 1 << pin;
56 else
57 tmp &= ~(1 << pin);
58 __raw_writel(tmp, VA_GPIO_BASE + MXC_DDIR(port));
59
60 /* Primary / alternate function */
61 tmp = __raw_readl(VA_GPIO_BASE + MXC_GPR(port));
62 if (gpio_mode & GPIO_AF)
63 tmp |= (1 << pin);
64 else
65 tmp &= ~(1 << pin);
66 __raw_writel(tmp, VA_GPIO_BASE + MXC_GPR(port));
67
68 /* use as gpio? */
69 tmp = __raw_readl(VA_GPIO_BASE + MXC_GIUS(port));
70 if (gpio_mode & (GPIO_PF | GPIO_AF))
71 tmp &= ~(1 << pin);
72 else
73 tmp |= (1 << pin);
74 __raw_writel(tmp, VA_GPIO_BASE + MXC_GIUS(port));
75
76 if (pin < 16) {
77 tmp = __raw_readl(VA_GPIO_BASE + MXC_OCR1(port));
78 tmp &= ~(3 << (pin * 2));
79 tmp |= (ocr << (pin * 2));
80 __raw_writel(tmp, VA_GPIO_BASE + MXC_OCR1(port));
81
82 tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFA1(port));
83 tmp &= ~(3 << (pin * 2));
84 tmp |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
85 __raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFA1(port));
86
87 tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFB1(port));
88 tmp &= ~(3 << (pin * 2));
89 tmp |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
90 __raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFB1(port));
91 } else {
92 pin -= 16;
93
94 tmp = __raw_readl(VA_GPIO_BASE + MXC_OCR2(port));
95 tmp &= ~(3 << (pin * 2));
96 tmp |= (ocr << (pin * 2));
97 __raw_writel(tmp, VA_GPIO_BASE + MXC_OCR2(port));
98
99 tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFA2(port));
100 tmp &= ~(3 << (pin * 2));
101 tmp |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
102 __raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFA2(port));
103
104 tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFB2(port));
105 tmp &= ~(3 << (pin * 2));
106 tmp |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
107 __raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFB2(port));
108 }
109}
110EXPORT_SYMBOL(mxc_gpio_mode);
111
112int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
113 int alloc_mode, const char *label)
114{
115 const int *p = pin_list;
116 int i;
117 unsigned gpio;
118 unsigned mode;
119
120 for (i = 0; i < count; i++) {
121 gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
122 mode = *p & ~(GPIO_PIN_MASK | GPIO_PORT_MASK);
123
124 if (gpio >= (GPIO_PORT_MAX + 1) * 32)
125 goto setup_error;
126
127 if (alloc_mode & MXC_GPIO_ALLOC_MODE_RELEASE)
128 gpio_free(gpio);
129 else if (!(alloc_mode & MXC_GPIO_ALLOC_MODE_NO_ALLOC))
130 if (gpio_request(gpio, label)
131 && !(alloc_mode & MXC_GPIO_ALLOC_MODE_TRY_ALLOC))
132 goto setup_error;
133
134 if (!(alloc_mode & (MXC_GPIO_ALLOC_MODE_ALLOC_ONLY |
135 MXC_GPIO_ALLOC_MODE_RELEASE)))
136 mxc_gpio_mode(gpio | mode);
137
138 p++;
139 }
140 return 0;
141
142setup_error:
143 if (alloc_mode & (MXC_GPIO_ALLOC_MODE_NO_ALLOC |
144 MXC_GPIO_ALLOC_MODE_TRY_ALLOC))
145 return -EINVAL;
146
147 while (p != pin_list) {
148 p--;
149 gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
150 gpio_free(gpio);
151 }
152
153 return -EINVAL;
154}
155EXPORT_SYMBOL(mxc_gpio_setup_multiple_pins);
156
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