LXR uboot/drivers/gpio/mpc83xx

   1/*
   2 * Freescale MPC83xx GPIO handling.
   3 *
   4 * SPDX-License-Identifier:     GPL-2.0+
   5 */
   6
   7#include <common.h>
   8#include <mpc83xx.h>
   9#include <asm/gpio.h>
  10#include <asm/io.h>
  11
  12#ifndef CONFIG_MPC83XX_GPIO_0_INIT_DIRECTION
  13#define CONFIG_MPC83XX_GPIO_0_INIT_DIRECTION 0
  14#endif
  15#ifndef CONFIG_MPC83XX_GPIO_1_INIT_DIRECTION
  16#define CONFIG_MPC83XX_GPIO_1_INIT_DIRECTION 0
  17#endif
  18#ifndef CONFIG_MPC83XX_GPIO_0_INIT_OPEN_DRAIN
  19#define CONFIG_MPC83XX_GPIO_0_INIT_OPEN_DRAIN 0
  20#endif
  21#ifndef CONFIG_MPC83XX_GPIO_1_INIT_OPEN_DRAIN
  22#define CONFIG_MPC83XX_GPIO_1_INIT_OPEN_DRAIN 0
  23#endif
  24#ifndef CONFIG_MPC83XX_GPIO_0_INIT_VALUE
  25#define CONFIG_MPC83XX_GPIO_0_INIT_VALUE 0
  26#endif
  27#ifndef CONFIG_MPC83XX_GPIO_1_INIT_VALUE
  28#define CONFIG_MPC83XX_GPIO_1_INIT_VALUE 0
  29#endif
  30
  31static unsigned int gpio_output_value[MPC83XX_GPIO_CTRLRS];
  32
  33/*
  34 * Generic_GPIO primitives.
  35 */
  36
  37int gpio_request(unsigned gpio, const char *label)
  38{
  39        if (gpio >= MAX_NUM_GPIOS)
  40                return -1;
  41
  42        return 0;
  43}
  44
  45int gpio_free(unsigned gpio)
  46{
  47        /* Do not set to input */
  48        return 0;
  49}
  50
  51/* set GPIO pin 'gpio' as an input */
  52int gpio_direction_input(unsigned gpio)
  53{
  54        immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
  55        unsigned int ctrlr;
  56        unsigned int line;
  57        unsigned int line_mask;
  58
  59        /* 32-bits per controller */
  60        ctrlr = gpio >> 5;
  61        line = gpio & (0x1F);
  62
  63        /* Big endian */
  64        line_mask = 1 << (31 - line);
  65
  66        clrbits_be32(&im->gpio[ctrlr].dir, line_mask);
  67
  68        return 0;
  69}
  70
  71/* set GPIO pin 'gpio' as an output, with polarity 'value' */
  72int gpio_direction_output(unsigned gpio, int value)
  73{
  74        immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
  75        unsigned int ctrlr;
  76        unsigned int line;
  77        unsigned int line_mask;
  78
  79        if (value != 0 && value != 1) {
  80                printf("Error: Value parameter must be 0 or 1.\n");
  81                return -1;
  82        }
  83
  84        gpio_set_value(gpio, value);
  85
  86        /* 32-bits per controller */
  87        ctrlr = gpio >> 5;
  88        line = gpio & (0x1F);
  89
  90        /* Big endian */
  91        line_mask = 1 << (31 - line);
  92
  93        /* Make the line output */
  94        setbits_be32(&im->gpio[ctrlr].dir, line_mask);
  95
  96        return 0;
  97}
  98
  99/* read GPIO IN value of pin 'gpio' */
 100int gpio_get_value(unsigned gpio)
 101{
 102        immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
 103        unsigned int ctrlr;
 104        unsigned int line;
 105        unsigned int line_mask;
 106
 107        /* 32-bits per controller */
 108        ctrlr = gpio >> 5;
 109        line = gpio & (0x1F);
 110
 111        /* Big endian */
 112        line_mask = 1 << (31 - line);
 113
 114        /* Read the value and mask off the bit */
 115        return (in_be32(&im->gpio[ctrlr].dat) & line_mask) != 0;
 116}
 117
 118/* write GPIO OUT value to pin 'gpio' */
 119int gpio_set_value(unsigned gpio, int value)
 120{
 121        immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
 122        unsigned int ctrlr;
 123        unsigned int line;
 124        unsigned int line_mask;
 125
 126        if (value != 0 && value != 1) {
 127                printf("Error: Value parameter must be 0 or 1.\n");
 128                return -1;
 129        }
 130
 131        /* 32-bits per controller */
 132        ctrlr = gpio >> 5;
 133        line = gpio & (0x1F);
 134
 135        /* Big endian */
 136        line_mask = 1 << (31 - line);
 137
 138        /* Update the local output buffer soft copy */
 139        gpio_output_value[ctrlr] =
 140                (gpio_output_value[ctrlr] & ~line_mask) | \
 141                        (value ? line_mask : 0);
 142
 143        /* Write the output */
 144        out_be32(&im->gpio[ctrlr].dat, gpio_output_value[ctrlr]);
 145
 146        return 0;
 147}
 148
 149/* Configure GPIO registers early */
 150void mpc83xx_gpio_init_f(void)
 151{
 152        immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
 153
 154#if MPC83XX_GPIO_CTRLRS >= 1
 155        out_be32(&im->gpio[0].dir, CONFIG_MPC83XX_GPIO_0_INIT_DIRECTION);
 156        out_be32(&im->gpio[0].odr, CONFIG_MPC83XX_GPIO_0_INIT_OPEN_DRAIN);
 157        out_be32(&im->gpio[0].dat, CONFIG_MPC83XX_GPIO_0_INIT_VALUE);
 158        out_be32(&im->gpio[0].ier, 0xFFFFFFFF); /* Clear all events */
 159        out_be32(&im->gpio[0].imr, 0);
 160        out_be32(&im->gpio[0].icr, 0);
 161#endif
 162
 163#if MPC83XX_GPIO_CTRLRS >= 2
 164        out_be32(&im->gpio[1].dir, CONFIG_MPC83XX_GPIO_1_INIT_DIRECTION);
 165        out_be32(&im->gpio[1].odr, CONFIG_MPC83XX_GPIO_1_INIT_OPEN_DRAIN);
 166        out_be32(&im->gpio[1].dat, CONFIG_MPC83XX_GPIO_1_INIT_VALUE);
 167        out_be32(&im->gpio[1].ier, 0xFFFFFFFF); /* Clear all events */
 168        out_be32(&im->gpio[1].imr, 0);
 169        out_be32(&im->gpio[1].icr, 0);
 170#endif
 171}
 172
 173/* Initialize GPIO soft-copies */
 174void mpc83xx_gpio_init_r(void)
 175{
 176#if MPC83XX_GPIO_CTRLRS >= 1
 177        gpio_output_value[0] = CONFIG_MPC83XX_GPIO_0_INIT_VALUE;
 178#endif
 179
 180#if MPC83XX_GPIO_CTRLRS >= 2
 181        gpio_output_value[1] = CONFIG_MPC83XX_GPIO_1_INIT_VALUE;
 182#endif
 183}
 184