led_bcm6358.c 4.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
  4. */
  5. #include <common.h>
  6. #include <dm.h>
  7. #include <errno.h>
  8. #include <led.h>
  9. #include <asm/io.h>
  10. #include <dm/lists.h>
  11. #define LEDS_MAX 32
  12. #define LEDS_WAIT 100
  13. /* LED Mode register */
  14. #define LED_MODE_REG 0x0
  15. #define LED_MODE_OFF 0
  16. #define LED_MODE_ON 1
  17. #define LED_MODE_MASK 1
  18. /* LED Control register */
  19. #define LED_CTRL_REG 0x4
  20. #define LED_CTRL_CLK_MASK 0x3
  21. #define LED_CTRL_CLK_1 0
  22. #define LED_CTRL_CLK_2 1
  23. #define LED_CTRL_CLK_4 2
  24. #define LED_CTRL_CLK_8 3
  25. #define LED_CTRL_POL_SHIFT 2
  26. #define LED_CTRL_POL_MASK (1 << LED_CTRL_POL_SHIFT)
  27. #define LED_CTRL_BUSY_SHIFT 3
  28. #define LED_CTRL_BUSY_MASK (1 << LED_CTRL_BUSY_SHIFT)
  29. struct bcm6358_led_priv {
  30. void __iomem *regs;
  31. uint8_t pin;
  32. bool active_low;
  33. };
  34. static void bcm6358_led_busy(void __iomem *regs)
  35. {
  36. while (readl_be(regs + LED_CTRL_REG) & LED_CTRL_BUSY_MASK)
  37. udelay(LEDS_WAIT);
  38. }
  39. static unsigned long bcm6358_led_get_mode(struct bcm6358_led_priv *priv)
  40. {
  41. bcm6358_led_busy(priv->regs);
  42. return (readl_be(priv->regs + LED_MODE_REG) >> priv->pin) &
  43. LED_MODE_MASK;
  44. }
  45. static int bcm6358_led_set_mode(struct bcm6358_led_priv *priv, uint8_t mode)
  46. {
  47. bcm6358_led_busy(priv->regs);
  48. clrsetbits_be32(priv->regs + LED_MODE_REG,
  49. (LED_MODE_MASK << priv->pin),
  50. (mode << priv->pin));
  51. return 0;
  52. }
  53. static enum led_state_t bcm6358_led_get_state(struct udevice *dev)
  54. {
  55. struct bcm6358_led_priv *priv = dev_get_priv(dev);
  56. enum led_state_t state = LEDST_OFF;
  57. switch (bcm6358_led_get_mode(priv)) {
  58. case LED_MODE_OFF:
  59. state = (priv->active_low ? LEDST_ON : LEDST_OFF);
  60. break;
  61. case LED_MODE_ON:
  62. state = (priv->active_low ? LEDST_OFF : LEDST_ON);
  63. break;
  64. }
  65. return state;
  66. }
  67. static int bcm6358_led_set_state(struct udevice *dev, enum led_state_t state)
  68. {
  69. struct bcm6358_led_priv *priv = dev_get_priv(dev);
  70. unsigned long mode;
  71. switch (state) {
  72. case LEDST_OFF:
  73. mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
  74. break;
  75. case LEDST_ON:
  76. mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
  77. break;
  78. case LEDST_TOGGLE:
  79. if (bcm6358_led_get_state(dev) == LEDST_OFF)
  80. return bcm6358_led_set_state(dev, LEDST_ON);
  81. else
  82. return bcm6358_led_set_state(dev, LEDST_OFF);
  83. break;
  84. default:
  85. return -ENOSYS;
  86. }
  87. return bcm6358_led_set_mode(priv, mode);
  88. }
  89. static const struct led_ops bcm6358_led_ops = {
  90. .get_state = bcm6358_led_get_state,
  91. .set_state = bcm6358_led_set_state,
  92. };
  93. static int bcm6358_led_probe(struct udevice *dev)
  94. {
  95. struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
  96. /* Top-level LED node */
  97. if (!uc_plat->label) {
  98. void __iomem *regs;
  99. unsigned int clk_div;
  100. u32 set_bits = 0;
  101. regs = dev_remap_addr(dev);
  102. if (!regs)
  103. return -EINVAL;
  104. if (dev_read_bool(dev, "brcm,clk-dat-low"))
  105. set_bits |= LED_CTRL_POL_MASK;
  106. clk_div = dev_read_u32_default(dev, "brcm,clk-div",
  107. LED_CTRL_CLK_1);
  108. switch (clk_div) {
  109. case 8:
  110. set_bits |= LED_CTRL_CLK_8;
  111. break;
  112. case 4:
  113. set_bits |= LED_CTRL_CLK_4;
  114. break;
  115. case 2:
  116. set_bits |= LED_CTRL_CLK_2;
  117. break;
  118. default:
  119. set_bits |= LED_CTRL_CLK_1;
  120. break;
  121. }
  122. bcm6358_led_busy(regs);
  123. clrsetbits_be32(regs + LED_CTRL_REG,
  124. LED_CTRL_POL_MASK | LED_CTRL_CLK_MASK,
  125. set_bits);
  126. } else {
  127. struct bcm6358_led_priv *priv = dev_get_priv(dev);
  128. unsigned int pin;
  129. priv->regs = dev_remap_addr(dev);
  130. if (!priv->regs)
  131. return -EINVAL;
  132. pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
  133. if (pin >= LEDS_MAX)
  134. return -EINVAL;
  135. priv->pin = pin;
  136. if (dev_read_bool(dev, "active-low"))
  137. priv->active_low = true;
  138. }
  139. return 0;
  140. }
  141. static int bcm6358_led_bind(struct udevice *parent)
  142. {
  143. ofnode node;
  144. dev_for_each_subnode(node, parent) {
  145. struct led_uc_plat *uc_plat;
  146. struct udevice *dev;
  147. const char *label;
  148. int ret;
  149. label = ofnode_read_string(node, "label");
  150. if (!label) {
  151. debug("%s: node %s has no label\n", __func__,
  152. ofnode_get_name(node));
  153. return -EINVAL;
  154. }
  155. ret = device_bind_driver_to_node(parent, "bcm6358-led",
  156. ofnode_get_name(node),
  157. node, &dev);
  158. if (ret)
  159. return ret;
  160. uc_plat = dev_get_uclass_platdata(dev);
  161. uc_plat->label = label;
  162. }
  163. return 0;
  164. }
  165. static const struct udevice_id bcm6358_led_ids[] = {
  166. { .compatible = "brcm,bcm6358-leds" },
  167. { /* sentinel */ }
  168. };
  169. U_BOOT_DRIVER(bcm6358_led) = {
  170. .name = "bcm6358-led",
  171. .id = UCLASS_LED,
  172. .of_match = bcm6358_led_ids,
  173. .bind = bcm6358_led_bind,
  174. .probe = bcm6358_led_probe,
  175. .priv_auto_alloc_size = sizeof(struct bcm6358_led_priv),
  176. .ops = &bcm6358_led_ops,
  177. };