vybrid_gpio.c 3.4 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2015
  4. * Bhuvanchandra DV, Toradex, Inc.
  5. */
  6. #include <common.h>
  7. #include <dm.h>
  8. #include <errno.h>
  9. #include <fdtdec.h>
  10. #include <asm/gpio.h>
  11. #include <asm/mach-imx/iomux-v3.h>
  12. #include <asm/io.h>
  13. #include <malloc.h>
  14. DECLARE_GLOBAL_DATA_PTR;
  15. struct vybrid_gpios {
  16. unsigned int chip;
  17. struct vybrid_gpio_regs *reg;
  18. };
  19. static int vybrid_gpio_direction_input(struct udevice *dev, unsigned gpio)
  20. {
  21. const struct vybrid_gpios *gpios = dev_get_priv(dev);
  22. gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
  23. imx_iomux_gpio_set_direction(gpio, VF610_GPIO_DIRECTION_IN);
  24. return 0;
  25. }
  26. static int vybrid_gpio_direction_output(struct udevice *dev, unsigned gpio,
  27. int value)
  28. {
  29. const struct vybrid_gpios *gpios = dev_get_priv(dev);
  30. gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
  31. gpio_set_value(gpio, value);
  32. imx_iomux_gpio_set_direction(gpio, VF610_GPIO_DIRECTION_OUT);
  33. return 0;
  34. }
  35. static int vybrid_gpio_get_value(struct udevice *dev, unsigned gpio)
  36. {
  37. const struct vybrid_gpios *gpios = dev_get_priv(dev);
  38. return ((readl(&gpios->reg->gpio_pdir) & (1 << gpio))) ? 1 : 0;
  39. }
  40. static int vybrid_gpio_set_value(struct udevice *dev, unsigned gpio,
  41. int value)
  42. {
  43. const struct vybrid_gpios *gpios = dev_get_priv(dev);
  44. if (value)
  45. writel((1 << gpio), &gpios->reg->gpio_psor);
  46. else
  47. writel((1 << gpio), &gpios->reg->gpio_pcor);
  48. return 0;
  49. }
  50. static int vybrid_gpio_get_function(struct udevice *dev, unsigned gpio)
  51. {
  52. const struct vybrid_gpios *gpios = dev_get_priv(dev);
  53. u32 g_state = 0;
  54. gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
  55. imx_iomux_gpio_get_function(gpio, &g_state);
  56. if (((g_state & (0x07 << PAD_MUX_MODE_SHIFT)) >> PAD_MUX_MODE_SHIFT) > 0)
  57. return GPIOF_FUNC;
  58. if (g_state & PAD_CTL_OBE_ENABLE)
  59. return GPIOF_OUTPUT;
  60. if (g_state & PAD_CTL_IBE_ENABLE)
  61. return GPIOF_INPUT;
  62. if (!(g_state & PAD_CTL_OBE_IBE_ENABLE))
  63. return GPIOF_UNUSED;
  64. return GPIOF_UNKNOWN;
  65. }
  66. static const struct dm_gpio_ops gpio_vybrid_ops = {
  67. .direction_input = vybrid_gpio_direction_input,
  68. .direction_output = vybrid_gpio_direction_output,
  69. .get_value = vybrid_gpio_get_value,
  70. .set_value = vybrid_gpio_set_value,
  71. .get_function = vybrid_gpio_get_function,
  72. };
  73. static int vybrid_gpio_probe(struct udevice *dev)
  74. {
  75. struct vybrid_gpios *gpios = dev_get_priv(dev);
  76. struct vybrid_gpio_platdata *plat = dev_get_platdata(dev);
  77. struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
  78. uc_priv->bank_name = plat->port_name;
  79. uc_priv->gpio_count = VYBRID_GPIO_COUNT;
  80. gpios->reg = (struct vybrid_gpio_regs *)plat->base;
  81. gpios->chip = plat->chip;
  82. return 0;
  83. }
  84. static int vybrid_gpio_odata_to_platdata(struct udevice *dev)
  85. {
  86. struct vybrid_gpio_platdata *plat = dev_get_platdata(dev);
  87. fdt_addr_t base_addr;
  88. base_addr = dev_read_addr(dev);
  89. if (base_addr == FDT_ADDR_T_NONE)
  90. return -EINVAL;
  91. plat->base = base_addr;
  92. plat->chip = dev->req_seq;
  93. plat->port_name = fdt_get_name(gd->fdt_blob, dev_of_offset(dev), NULL);
  94. return 0;
  95. }
  96. static const struct udevice_id vybrid_gpio_ids[] = {
  97. { .compatible = "fsl,vf610-gpio" },
  98. { }
  99. };
  100. U_BOOT_DRIVER(gpio_vybrid) = {
  101. .name = "gpio_vybrid",
  102. .id = UCLASS_GPIO,
  103. .ops = &gpio_vybrid_ops,
  104. .of_match = vybrid_gpio_ids,
  105. .ofdata_to_platdata = vybrid_gpio_odata_to_platdata,
  106. .probe = vybrid_gpio_probe,
  107. .priv_auto_alloc_size = sizeof(struct vybrid_gpios),
  108. .platdata_auto_alloc_size = sizeof(struct vybrid_gpio_platdata),
  109. };