pinctrl-meson-gx-pmx.c 4.2 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153
  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (C) Copyright 2016 - Beniamino Galvani <b.galvani@gmail.com>
  4. */
  5. #include <log.h>
  6. #include <asm/gpio.h>
  7. #include <common.h>
  8. #include <dm.h>
  9. #include <dm/pinctrl.h>
  10. #include <linux/bitops.h>
  11. #include <linux/io.h>
  12. #include "pinctrl-meson-gx.h"
  13. static void meson_gx_pinmux_disable_other_groups(struct meson_pinctrl *priv,
  14. unsigned int pin,
  15. int sel_group)
  16. {
  17. struct meson_pmx_group *group;
  18. struct meson_gx_pmx_data *pmx_data;
  19. void __iomem *addr;
  20. int i, j;
  21. for (i = 0; i < priv->data->num_groups; i++) {
  22. group = &priv->data->groups[i];
  23. pmx_data = (struct meson_gx_pmx_data *)group->data;
  24. if (pmx_data->is_gpio || i == sel_group)
  25. continue;
  26. for (j = 0; j < group->num_pins; j++) {
  27. if (group->pins[j] == pin) {
  28. /* We have found a group using the pin */
  29. debug("pinmux: disabling %s\n", group->name);
  30. addr = priv->reg_mux + pmx_data->reg * 4;
  31. writel(readl(addr) & ~BIT(pmx_data->bit), addr);
  32. }
  33. }
  34. }
  35. }
  36. static int meson_gx_pinmux_group_set(struct udevice *dev,
  37. unsigned int group_selector,
  38. unsigned int func_selector)
  39. {
  40. struct meson_pinctrl *priv = dev_get_priv(dev);
  41. const struct meson_pmx_group *group;
  42. const struct meson_pmx_func *func;
  43. struct meson_gx_pmx_data *pmx_data;
  44. void __iomem *addr;
  45. int i;
  46. group = &priv->data->groups[group_selector];
  47. pmx_data = (struct meson_gx_pmx_data *)group->data;
  48. func = &priv->data->funcs[func_selector];
  49. debug("pinmux: set group %s func %s\n", group->name, func->name);
  50. /*
  51. * Disable groups using the same pins.
  52. * The selected group is not disabled to avoid glitches.
  53. */
  54. for (i = 0; i < group->num_pins; i++) {
  55. meson_gx_pinmux_disable_other_groups(priv,
  56. group->pins[i],
  57. group_selector);
  58. }
  59. /* Function 0 (GPIO) doesn't need any additional setting */
  60. if (func_selector) {
  61. addr = priv->reg_mux + pmx_data->reg * 4;
  62. writel(readl(addr) | BIT(pmx_data->bit), addr);
  63. }
  64. return 0;
  65. }
  66. static int meson_gx_pinmux_get(struct udevice *dev,
  67. unsigned int selector,
  68. char *buf, int size)
  69. {
  70. struct meson_pinctrl *priv = dev_get_priv(dev);
  71. struct meson_pmx_group *group;
  72. struct meson_gx_pmx_data *pmx_data;
  73. void __iomem *addr;
  74. int i, j, pos = 0;
  75. unsigned int pin;
  76. u32 reg;
  77. pin = selector + priv->data->pin_base;
  78. for (i = 0; i < priv->data->num_groups; i++) {
  79. group = &priv->data->groups[i];
  80. pmx_data = (struct meson_gx_pmx_data *)group->data;
  81. if (pmx_data->is_gpio)
  82. continue;
  83. for (j = 0; j < group->num_pins; j++) {
  84. if (group->pins[j] == pin) {
  85. /* We have found a group using the pin */
  86. addr = priv->reg_mux + pmx_data->reg * 4;
  87. reg = readl(addr) & BIT(pmx_data->bit);
  88. if (reg) {
  89. pos += snprintf(buf + pos, size - pos,
  90. "%s ", group->name) - 1;
  91. return 0;
  92. }
  93. }
  94. }
  95. }
  96. /* Fallback, must be used as GPIO */
  97. snprintf(buf, size, "%s or Unknown",
  98. priv->data->groups[selector].name);
  99. return 0;
  100. }
  101. const struct pinconf_param meson_gx_pinconf_params[] = {
  102. { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
  103. { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
  104. { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
  105. };
  106. const struct pinctrl_ops meson_gx_pinctrl_ops = {
  107. .get_groups_count = meson_pinctrl_get_groups_count,
  108. .get_group_name = meson_pinctrl_get_group_name,
  109. .get_functions_count = meson_pinmux_get_functions_count,
  110. .get_function_name = meson_pinmux_get_function_name,
  111. .pinmux_group_set = meson_gx_pinmux_group_set,
  112. .set_state = pinctrl_generic_set_state,
  113. .pinconf_params = meson_gx_pinconf_params,
  114. .pinconf_num_params = ARRAY_SIZE(meson_gx_pinconf_params),
  115. .pinconf_set = meson_pinconf_set,
  116. .pinconf_group_set = meson_pinconf_group_set,
  117. .get_pin_name = meson_pinctrl_get_pin_name,
  118. .get_pins_count = meson_pinctrl_get_pins_count,
  119. .get_pin_muxing = meson_gx_pinmux_get,
  120. };
  121. static const struct dm_gpio_ops meson_gx_gpio_ops = {
  122. .set_value = meson_gpio_set,
  123. .get_value = meson_gpio_get,
  124. .get_function = meson_gpio_get_direction,
  125. .direction_input = meson_gpio_direction_input,
  126. .direction_output = meson_gpio_direction_output,
  127. };
  128. const struct driver meson_gx_gpio_driver = {
  129. .name = "meson-gx-gpio",
  130. .id = UCLASS_GPIO,
  131. .probe = meson_gpio_probe,
  132. .ops = &meson_gx_gpio_ops,
  133. };