drivers/gpio/mxs_gpio.c

   1 /*
   2  * Freescale i.MX28 GPIO control code
   3  *
   4  * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
   5  * on behalf of DENX Software Engineering GmbH
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <linux/errno.h>
  12 #include <asm/io.h>
  13 #include <asm/arch/iomux.h>
  14 #include <asm/arch/imx-regs.h>
  15
  16 #if     defined(CONFIG_MX23)
  17 #define PINCTRL_BANKS           3
  18 #define PINCTRL_DOUT(n)         (0x0500 + ((n) * 0x10))
  19 #define PINCTRL_DIN(n)          (0x0600 + ((n) * 0x10))
  20 #define PINCTRL_DOE(n)          (0x0700 + ((n) * 0x10))
  21 #define PINCTRL_PIN2IRQ(n)      (0x0800 + ((n) * 0x10))
  22 #define PINCTRL_IRQEN(n)        (0x0900 + ((n) * 0x10))
  23 #define PINCTRL_IRQSTAT(n)      (0x0c00 + ((n) * 0x10))
  24 #elif   defined(CONFIG_MX28)
  25 #define PINCTRL_BANKS           5
  26 #define PINCTRL_DOUT(n)         (0x0700 + ((n) * 0x10))
  27 #define PINCTRL_DIN(n)          (0x0900 + ((n) * 0x10))
  28 #define PINCTRL_DOE(n)          (0x0b00 + ((n) * 0x10))
  29 #define PINCTRL_PIN2IRQ(n)      (0x1000 + ((n) * 0x10))
  30 #define PINCTRL_IRQEN(n)        (0x1100 + ((n) * 0x10))
  31 #define PINCTRL_IRQSTAT(n)      (0x1400 + ((n) * 0x10))
  32 #else
  33 #error "Please select CONFIG_MX23 or CONFIG_MX28"
  34 #endif
  35
  36 #define GPIO_INT_FALL_EDGE      0x0
  37 #define GPIO_INT_LOW_LEV        0x1
  38 #define GPIO_INT_RISE_EDGE      0x2
  39 #define GPIO_INT_HIGH_LEV       0x3
  40 #define GPIO_INT_LEV_MASK       (1 << 0)
  41 #define GPIO_INT_POL_MASK       (1 << 1)
  42
  43 void mxs_gpio_init(void)
  44 {
  45         int i;
  46
  47         for (i = 0; i < PINCTRL_BANKS; i++) {
  48                 writel(0, MXS_PINCTRL_BASE + PINCTRL_PIN2IRQ(i));
  49                 writel(0, MXS_PINCTRL_BASE + PINCTRL_IRQEN(i));
  50                 /* Use SCT address here to clear the IRQSTAT bits */
  51                 writel(0xffffffff, MXS_PINCTRL_BASE + PINCTRL_IRQSTAT(i) + 8);
  52         }
  53 }
  54
  55 int gpio_get_value(unsigned gpio)
  56 {
  57         uint32_t bank = PAD_BANK(gpio);
  58         uint32_t offset = PINCTRL_DIN(bank);
  59         struct mxs_register_32 *reg =
  60                 (struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
  61
  62         return (readl(&reg->reg) >> PAD_PIN(gpio)) & 1;
  63 }
  64
  65 void gpio_set_value(unsigned gpio, int value)
  66 {
  67         uint32_t bank = PAD_BANK(gpio);
  68         uint32_t offset = PINCTRL_DOUT(bank);
  69         struct mxs_register_32 *reg =
  70                 (struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
  71
  72         if (value)
  73                 writel(1 << PAD_PIN(gpio), &reg->reg_set);
  74         else
  75                 writel(1 << PAD_PIN(gpio), &reg->reg_clr);
  76 }
  77
  78 int gpio_direction_input(unsigned gpio)
  79 {
  80         uint32_t bank = PAD_BANK(gpio);
  81         uint32_t offset = PINCTRL_DOE(bank);
  82         struct mxs_register_32 *reg =
  83                 (struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
  84
  85         writel(1 << PAD_PIN(gpio), &reg->reg_clr);
  86
  87         return 0;
  88 }
  89
  90 int gpio_direction_output(unsigned gpio, int value)
  91 {
  92         uint32_t bank = PAD_BANK(gpio);
  93         uint32_t offset = PINCTRL_DOE(bank);
  94         struct mxs_register_32 *reg =
  95                 (struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
  96
  97         gpio_set_value(gpio, value);
  98
  99         writel(1 << PAD_PIN(gpio), &reg->reg_set);
 100
 101         return 0;
 102 }
 103
 104 int gpio_request(unsigned gpio, const char *label)
 105 {
 106         if (PAD_BANK(gpio) >= PINCTRL_BANKS)
 107                 return -1;
 108
 109         return 0;
 110 }
 111
 112 int gpio_free(unsigned gpio)
 113 {
 114         return 0;
 115 }
 116
 117 int name_to_gpio(const char *name)
 118 {
 119         unsigned bank, pin;
 120         char *end;
 121
 122         bank = simple_strtoul(name, &end, 10);
 123
 124         if (!*end || *end != ':')
 125                 return bank;
 126
 127         pin = simple_strtoul(end + 1, NULL, 10);
 128
 129         return (bank << MXS_PAD_BANK_SHIFT) | (pin << MXS_PAD_PIN_SHIFT);
 130 }