drivers/gpio/msm_gpio.c

   1 /*
   2  * Qualcomm GPIO driver
   3  *
   4  * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <dm.h>
  11 #include <errno.h>
  12 #include <asm/gpio.h>
  13 #include <asm/io.h>
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 /* Register offsets */
  18 #define GPIO_CONFIG_OFF(no)         ((no) * 0x1000)
  19 #define GPIO_IN_OUT_OFF(no)         ((no) * 0x1000 + 0x4)
  20
  21 /* OE */
  22 #define GPIO_OE_DISABLE  (0x0 << 9)
  23 #define GPIO_OE_ENABLE   (0x1 << 9)
  24 #define GPIO_OE_MASK     (0x1 << 9)
  25
  26 /* GPIO_IN_OUT register shifts. */
  27 #define GPIO_IN          0
  28 #define GPIO_OUT         1
  29
  30 struct msm_gpio_bank {
  31         phys_addr_t base;
  32 };
  33
  34 static int msm_gpio_direction_input(struct udevice *dev, unsigned int gpio)
  35 {
  36         struct msm_gpio_bank *priv = dev_get_priv(dev);
  37         phys_addr_t reg = priv->base + GPIO_CONFIG_OFF(gpio);
  38
  39         /* Disable OE bit */
  40         clrsetbits_le32(reg, GPIO_OE_MASK, GPIO_OE_DISABLE);
  41
  42         return 0;
  43 }
  44
  45 static int msm_gpio_set_value(struct udevice *dev, unsigned gpio, int value)
  46 {
  47         struct msm_gpio_bank *priv = dev_get_priv(dev);
  48
  49         value = !!value;
  50         /* set value */
  51         writel(value << GPIO_OUT, priv->base + GPIO_IN_OUT_OFF(gpio));
  52
  53         return 0;
  54 }
  55
  56 static int msm_gpio_direction_output(struct udevice *dev, unsigned gpio,
  57                                      int value)
  58 {
  59         struct msm_gpio_bank *priv = dev_get_priv(dev);
  60         phys_addr_t reg = priv->base + GPIO_CONFIG_OFF(gpio);
  61
  62         value = !!value;
  63         /* set value */
  64         writel(value << GPIO_OUT, priv->base + GPIO_IN_OUT_OFF(gpio));
  65         /* switch direction */
  66         clrsetbits_le32(reg, GPIO_OE_MASK, GPIO_OE_ENABLE);
  67
  68         return 0;
  69 }
  70
  71 static int msm_gpio_get_value(struct udevice *dev, unsigned gpio)
  72 {
  73         struct msm_gpio_bank *priv = dev_get_priv(dev);
  74
  75         return !!(readl(priv->base + GPIO_IN_OUT_OFF(gpio)) >> GPIO_IN);
  76 }
  77
  78 static int msm_gpio_get_function(struct udevice *dev, unsigned offset)
  79 {
  80         struct msm_gpio_bank *priv = dev_get_priv(dev);
  81
  82         if (readl(priv->base + GPIO_CONFIG_OFF(offset)) & GPIO_OE_ENABLE)
  83                 return GPIOF_OUTPUT;
  84
  85         return GPIOF_INPUT;
  86 }
  87
  88 static const struct dm_gpio_ops gpio_msm_ops = {
  89         .direction_input        = msm_gpio_direction_input,
  90         .direction_output       = msm_gpio_direction_output,
  91         .get_value              = msm_gpio_get_value,
  92         .set_value              = msm_gpio_set_value,
  93         .get_function           = msm_gpio_get_function,
  94 };
  95
  96 static int msm_gpio_probe(struct udevice *dev)
  97 {
  98         struct msm_gpio_bank *priv = dev_get_priv(dev);
  99
 100         priv->base = dev_get_addr(dev);
 101
 102         return priv->base == FDT_ADDR_T_NONE ? -EINVAL : 0;
 103 }
 104
 105 static int msm_gpio_ofdata_to_platdata(struct udevice *dev)
 106 {
 107         struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
 108
 109         uc_priv->gpio_count = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
 110                                              "gpio-count", 0);
 111         uc_priv->bank_name = fdt_getprop(gd->fdt_blob, dev_of_offset(dev),
 112                                          "gpio-bank-name", NULL);
 113         if (uc_priv->bank_name == NULL)
 114                 uc_priv->bank_name = "soc";
 115
 116         return 0;
 117 }
 118
 119 static const struct udevice_id msm_gpio_ids[] = {
 120         { .compatible = "qcom,msm8916-pinctrl" },
 121         { .compatible = "qcom,apq8016-pinctrl" },
 122         { }
 123 };
 124
 125 U_BOOT_DRIVER(gpio_msm) = {
 126         .name   = "gpio_msm",
 127         .id     = UCLASS_GPIO,
 128         .of_match = msm_gpio_ids,
 129         .ofdata_to_platdata = msm_gpio_ofdata_to_platdata,
 130         .probe  = msm_gpio_probe,
 131         .ops    = &gpio_msm_ops,
 132         .priv_auto_alloc_size = sizeof(struct msm_gpio_bank),
 133 };