sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Coldfire generic GPIO support. |
| 3 | * |
| 4 | * (C) Copyright 2009, Steven King <sfking@fdwdc.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 17 | #include <linux/module.h> |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 18 | #include <linux/init.h> |
Kay Sievers | a6ec0c0 | 2011-12-21 15:09:54 -0800 | [diff] [blame] | 19 | #include <linux/device.h> |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 20 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 21 | #include <linux/io.h> |
| 22 | #include <asm/coldfire.h> |
| 23 | #include <asm/mcfsim.h> |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 24 | #include <asm/mcfgpio.h> |
| 25 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 26 | int __mcfgpio_get_value(unsigned gpio) |
| 27 | { |
| 28 | return mcfgpio_read(__mcfgpio_ppdr(gpio)) & mcfgpio_bit(gpio); |
| 29 | } |
| 30 | EXPORT_SYMBOL(__mcfgpio_get_value); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 31 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 32 | void __mcfgpio_set_value(unsigned gpio, int value) |
| 33 | { |
| 34 | if (gpio < MCFGPIO_SCR_START) { |
| 35 | unsigned long flags; |
| 36 | MCFGPIO_PORTTYPE data; |
| 37 | |
| 38 | local_irq_save(flags); |
| 39 | data = mcfgpio_read(__mcfgpio_podr(gpio)); |
| 40 | if (value) |
| 41 | data |= mcfgpio_bit(gpio); |
| 42 | else |
| 43 | data &= ~mcfgpio_bit(gpio); |
| 44 | mcfgpio_write(data, __mcfgpio_podr(gpio)); |
| 45 | local_irq_restore(flags); |
| 46 | } else { |
| 47 | if (value) |
| 48 | mcfgpio_write(mcfgpio_bit(gpio), |
| 49 | MCFGPIO_SETR_PORT(gpio)); |
| 50 | else |
| 51 | mcfgpio_write(~mcfgpio_bit(gpio), |
| 52 | MCFGPIO_CLRR_PORT(gpio)); |
| 53 | } |
| 54 | } |
| 55 | EXPORT_SYMBOL(__mcfgpio_set_value); |
| 56 | |
| 57 | int __mcfgpio_direction_input(unsigned gpio) |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 58 | { |
| 59 | unsigned long flags; |
| 60 | MCFGPIO_PORTTYPE dir; |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 61 | |
| 62 | local_irq_save(flags); |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 63 | dir = mcfgpio_read(__mcfgpio_pddr(gpio)); |
| 64 | dir &= ~mcfgpio_bit(gpio); |
| 65 | mcfgpio_write(dir, __mcfgpio_pddr(gpio)); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 66 | local_irq_restore(flags); |
| 67 | |
| 68 | return 0; |
| 69 | } |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 70 | EXPORT_SYMBOL(__mcfgpio_direction_input); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 71 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 72 | int __mcfgpio_direction_output(unsigned gpio, int value) |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 73 | { |
| 74 | unsigned long flags; |
| 75 | MCFGPIO_PORTTYPE data; |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 76 | |
| 77 | local_irq_save(flags); |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 78 | data = mcfgpio_read(__mcfgpio_pddr(gpio)); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 79 | if (value) |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 80 | data |= mcfgpio_bit(gpio); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 81 | else |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 82 | data &= mcfgpio_bit(gpio); |
| 83 | mcfgpio_write(data, __mcfgpio_pddr(gpio)); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 84 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 85 | /* now set the data to output */ |
| 86 | if (gpio < MCFGPIO_SCR_START) { |
| 87 | data = mcfgpio_read(__mcfgpio_podr(gpio)); |
| 88 | if (value) |
| 89 | data |= mcfgpio_bit(gpio); |
| 90 | else |
| 91 | data &= ~mcfgpio_bit(gpio); |
| 92 | mcfgpio_write(data, __mcfgpio_podr(gpio)); |
| 93 | } else { |
| 94 | if (value) |
| 95 | mcfgpio_write(mcfgpio_bit(gpio), |
| 96 | MCFGPIO_SETR_PORT(gpio)); |
| 97 | else |
| 98 | mcfgpio_write(~mcfgpio_bit(gpio), |
| 99 | MCFGPIO_CLRR_PORT(gpio)); |
| 100 | } |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 101 | local_irq_restore(flags); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 102 | return 0; |
| 103 | } |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 104 | EXPORT_SYMBOL(__mcfgpio_direction_output); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 105 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 106 | int __mcfgpio_request(unsigned gpio) |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 107 | { |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 108 | return 0; |
| 109 | } |
| 110 | EXPORT_SYMBOL(__mcfgpio_request); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 111 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 112 | void __mcfgpio_free(unsigned gpio) |
| 113 | { |
| 114 | __mcfgpio_direction_input(gpio); |
| 115 | } |
| 116 | EXPORT_SYMBOL(__mcfgpio_free); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 117 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 118 | #ifdef CONFIG_GPIOLIB |
| 119 | |
| 120 | int mcfgpio_direction_input(struct gpio_chip *chip, unsigned offset) |
| 121 | { |
| 122 | return __mcfgpio_direction_input(offset); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 123 | } |
| 124 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 125 | int mcfgpio_get_value(struct gpio_chip *chip, unsigned offset) |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 126 | { |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 127 | return __mcfgpio_get_value(offset); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 128 | } |
| 129 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 130 | int mcfgpio_direction_output(struct gpio_chip *chip, unsigned offset, int value) |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 131 | { |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 132 | return __mcfgpio_direction_output(offset, value); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 133 | } |
| 134 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 135 | void mcfgpio_set_value(struct gpio_chip *chip, unsigned offset, int value) |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 136 | { |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 137 | __mcfgpio_set_value(offset, value); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 138 | } |
| 139 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 140 | int mcfgpio_request(struct gpio_chip *chip, unsigned offset) |
| 141 | { |
| 142 | return __mcfgpio_request(offset); |
| 143 | } |
| 144 | |
| 145 | void mcfgpio_free(struct gpio_chip *chip, unsigned offset) |
| 146 | { |
| 147 | __mcfgpio_free(offset); |
| 148 | } |
| 149 | |
| 150 | struct bus_type mcfgpio_subsys = { |
Kay Sievers | a6ec0c0 | 2011-12-21 15:09:54 -0800 | [diff] [blame] | 151 | .name = "gpio", |
| 152 | .dev_name = "gpio", |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 153 | }; |
| 154 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 155 | static struct gpio_chip mcfgpio_chip = { |
| 156 | .label = "mcfgpio", |
| 157 | .request = mcfgpio_request, |
| 158 | .free = mcfgpio_free, |
| 159 | .direction_input = mcfgpio_direction_input, |
| 160 | .direction_output = mcfgpio_direction_output, |
| 161 | .get = mcfgpio_get_value, |
| 162 | .set = mcfgpio_set_value, |
| 163 | .base = 0, |
| 164 | .ngpio = MCFGPIO_PIN_MAX, |
| 165 | }; |
Greg Ungerer | f23c144 | 2012-04-17 13:25:38 +1000 | [diff] [blame] | 166 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 167 | static int __init mcfgpio_sysinit(void) |
| 168 | { |
| 169 | gpiochip_add(&mcfgpio_chip); |
| 170 | return subsys_system_register(&mcfgpio_subsys, NULL); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 171 | } |
| 172 | |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame^] | 173 | core_initcall(mcfgpio_sysinit); |
| 174 | #endif |