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 | #ifndef coldfire_gpio_h |
| 17 | #define coldfire_gpio_h |
| 18 | |
| 19 | #include <linux/io.h> |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 20 | #include <asm/coldfire.h> |
| 21 | #include <asm/mcfsim.h> |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame] | 22 | #include <asm/mcfgpio.h> |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 23 | /* |
| 24 | * The Generic GPIO functions |
| 25 | * |
| 26 | * If the gpio is a compile time constant and is one of the Coldfire gpios, |
| 27 | * use the inline version, otherwise dispatch thru gpiolib. |
| 28 | */ |
| 29 | |
| 30 | static inline int gpio_get_value(unsigned gpio) |
| 31 | { |
| 32 | if (__builtin_constant_p(gpio) && gpio < MCFGPIO_PIN_MAX) |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame] | 33 | return mcfgpio_read(__mcfgpio_ppdr(gpio)) & mcfgpio_bit(gpio); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 34 | else |
| 35 | return __gpio_get_value(gpio); |
| 36 | } |
| 37 | |
| 38 | static inline void gpio_set_value(unsigned gpio, int value) |
| 39 | { |
| 40 | if (__builtin_constant_p(gpio) && gpio < MCFGPIO_PIN_MAX) { |
| 41 | if (gpio < MCFGPIO_SCR_START) { |
| 42 | unsigned long flags; |
| 43 | MCFGPIO_PORTTYPE data; |
| 44 | |
| 45 | local_irq_save(flags); |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame] | 46 | data = mcfgpio_read(__mcfgpio_podr(gpio)); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 47 | if (value) |
| 48 | data |= mcfgpio_bit(gpio); |
| 49 | else |
| 50 | data &= ~mcfgpio_bit(gpio); |
Steven King | eac5794 | 2012-05-21 13:10:19 -0700 | [diff] [blame] | 51 | mcfgpio_write(data, __mcfgpio_podr(gpio)); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 52 | local_irq_restore(flags); |
| 53 | } else { |
| 54 | if (value) |
| 55 | mcfgpio_write(mcfgpio_bit(gpio), |
| 56 | MCFGPIO_SETR_PORT(gpio)); |
| 57 | else |
| 58 | mcfgpio_write(~mcfgpio_bit(gpio), |
| 59 | MCFGPIO_CLRR_PORT(gpio)); |
| 60 | } |
| 61 | } else |
| 62 | __gpio_set_value(gpio, value); |
| 63 | } |
| 64 | |
| 65 | static inline int gpio_to_irq(unsigned gpio) |
| 66 | { |
Steven King | bea8bcb | 2012-06-06 14:28:31 -0700 | [diff] [blame] | 67 | #if defined(MCFGPIO_IRQ_MIN) |
| 68 | if ((gpio >= MCFGPIO_IRQ_MIN) && (gpio < MCFGPIO_IRQ_MAX)) |
| 69 | #else |
| 70 | if (gpio < MCFGPIO_IRQ_MAX) |
| 71 | #endif |
| 72 | return gpio + MCFGPIO_IRQ_VECBASE; |
| 73 | else |
| 74 | return __gpio_to_irq(gpio); |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | static inline int irq_to_gpio(unsigned irq) |
| 78 | { |
| 79 | return (irq >= MCFGPIO_IRQ_VECBASE && |
| 80 | irq < (MCFGPIO_IRQ_VECBASE + MCFGPIO_IRQ_MAX)) ? |
| 81 | irq - MCFGPIO_IRQ_VECBASE : -ENXIO; |
| 82 | } |
| 83 | |
| 84 | static inline int gpio_cansleep(unsigned gpio) |
| 85 | { |
| 86 | return gpio < MCFGPIO_PIN_MAX ? 0 : __gpio_cansleep(gpio); |
| 87 | } |
| 88 | |
Greg Ungerer | b2dfaa8 | 2013-04-08 14:21:31 +1000 | [diff] [blame] | 89 | static inline int gpio_request_one(unsigned gpio, unsigned long flags, const char *label) |
| 90 | { |
| 91 | int err; |
| 92 | |
| 93 | err = gpio_request(gpio, label); |
| 94 | if (err) |
| 95 | return err; |
| 96 | |
| 97 | if (flags & GPIOF_DIR_IN) |
| 98 | err = gpio_direction_input(gpio); |
| 99 | else |
| 100 | err = gpio_direction_output(gpio, |
| 101 | (flags & GPIOF_INIT_HIGH) ? 1 : 0); |
| 102 | |
| 103 | if (err) |
| 104 | gpio_free(gpio); |
| 105 | |
| 106 | return err; |
| 107 | } |
| 108 | |
sfking@fdwdc.com | af39bb8 | 2009-06-19 18:11:00 -0700 | [diff] [blame] | 109 | #endif |