Juergen Beisert | aa10abd | 2008-07-05 10:02:55 +0200 | [diff] [blame] | 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 | |
Russell King | be50972 | 2008-08-04 10:41:28 +0100 | [diff] [blame] | 33 | #include <asm/arch/hardware.h> |
Juergen Beisert | aa10abd | 2008-07-05 10:02:55 +0200 | [diff] [blame] | 34 | #include <asm/mach/map.h> |
| 35 | #include <asm/arch/iomux-mx1-mx2.h> |
| 36 | |
| 37 | void 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 | } |
| 110 | EXPORT_SYMBOL(mxc_gpio_mode); |
| 111 | |
| 112 | int 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 | |
| 142 | setup_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 | } |
| 155 | EXPORT_SYMBOL(mxc_gpio_setup_multiple_pins); |
| 156 | |