1 | /* gpio.c |
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2 | * |
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3 | * GPIO driver for the Milkymist One board |
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4 | * |
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5 | * The license and distribution terms for this file may be |
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6 | * found in the file LICENSE in this distribution or at |
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7 | * http://www.rtems.org/license/LICENSE. |
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8 | * |
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9 | * COPYRIGHT (c) 2010, 2011 Sebastien Bourdeauducq |
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10 | * COPYRIGHT (c) Yann Sionneau <yann.sionneau@telecom-sudparis.eu> (GSoC 2010) |
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11 | * Telecom SudParis |
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12 | */ |
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13 | |
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14 | #define RTEMS_STATUS_CHECKS_USE_PRINTK |
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15 | |
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16 | #include <stdlib.h> |
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17 | #include <stdio.h> |
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18 | #include <errno.h> |
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19 | #include <sys/types.h> |
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20 | #include <rtems.h> |
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21 | #include <rtems/status-checks.h> |
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22 | #include <bsp.h> |
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23 | #include <rtems/libio.h> |
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24 | #include "../include/system_conf.h" |
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25 | #include <bsp/milkymist_gpio.h> |
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26 | |
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27 | struct milkymist_gpio { |
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28 | char *name; |
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29 | unsigned int mask; |
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30 | bool readonly; |
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31 | }; |
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32 | |
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33 | static const struct milkymist_gpio gpio[] = { |
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34 | { |
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35 | .name = "/dev/led1", |
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36 | .mask = GPIO_LED1, |
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37 | .readonly = false |
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38 | }, |
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39 | { |
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40 | .name = "/dev/led2", |
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41 | .mask = GPIO_LED2, |
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42 | .readonly = false |
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43 | }, |
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44 | }; |
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45 | |
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46 | rtems_device_driver gpio_initialize( |
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47 | rtems_device_major_number major, |
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48 | rtems_device_minor_number minor, |
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49 | void *arg |
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50 | ) |
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51 | { |
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52 | rtems_status_code sc; |
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53 | int i; |
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54 | |
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55 | for (i=0;i<sizeof(gpio)/sizeof(struct milkymist_gpio);i++) { |
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56 | sc = rtems_io_register_name(gpio[i].name, major, i); |
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57 | RTEMS_CHECK_SC(sc, "create GPIO device"); |
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58 | } |
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59 | |
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60 | return RTEMS_SUCCESSFUL; |
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61 | } |
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62 | |
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63 | rtems_device_driver gpio_read( |
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64 | rtems_device_major_number major, |
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65 | rtems_device_minor_number minor, |
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66 | void *arg |
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67 | ) |
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68 | { |
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69 | unsigned int data; |
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70 | |
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71 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg; |
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72 | |
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73 | if (rw_args->offset > 0) { |
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74 | rw_args->bytes_moved = 0; |
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75 | return RTEMS_SUCCESSFUL; |
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76 | } |
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77 | |
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78 | rw_args->bytes_moved = 1; |
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79 | |
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80 | if (gpio[minor].readonly) |
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81 | data = MM_READ(MM_GPIO_IN); |
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82 | else |
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83 | data = MM_READ(MM_GPIO_OUT); |
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84 | |
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85 | if (data & gpio[minor].mask) |
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86 | *(uint8_t *)rw_args->buffer = '1'; |
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87 | else |
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88 | *(uint8_t *)rw_args->buffer = '0'; |
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89 | |
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90 | return RTEMS_SUCCESSFUL; |
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91 | } |
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92 | |
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93 | rtems_device_driver gpio_write( |
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94 | rtems_device_major_number major, |
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95 | rtems_device_minor_number minor, |
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96 | void *arg |
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97 | ) |
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98 | { |
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99 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg; |
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100 | |
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101 | if (gpio[minor].readonly) { |
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102 | rw_args->bytes_moved = 0; |
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103 | return RTEMS_UNSATISFIED; |
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104 | } |
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105 | |
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106 | if (rw_args->offset > 0) { |
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107 | rw_args->bytes_moved = 0; |
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108 | return RTEMS_SUCCESSFUL; |
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109 | } |
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110 | |
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111 | rw_args->bytes_moved = 1; |
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112 | |
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113 | if (*(uint8_t *)rw_args->buffer == '1') |
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114 | MM_WRITE(MM_GPIO_OUT, MM_READ(MM_GPIO_OUT)|gpio[minor].mask); |
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115 | else |
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116 | MM_WRITE(MM_GPIO_OUT, MM_READ(MM_GPIO_OUT) & ~gpio[minor].mask); |
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117 | |
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118 | return RTEMS_SUCCESSFUL; |
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119 | } |
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