led_bcm6328.c 5.8 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 24
  12. /* LED Init register */
  13. #define LED_INIT_REG 0x00
  14. #define LED_INIT_FASTINTV_MS 20
  15. #define LED_INIT_FASTINTV_SHIFT 6
  16. #define LED_INIT_FASTINTV_MASK (0x3f << LED_INIT_FASTINTV_SHIFT)
  17. #define LED_INIT_SLEDEN_SHIFT 12
  18. #define LED_INIT_SLEDEN_MASK (1 << LED_INIT_SLEDEN_SHIFT)
  19. #define LED_INIT_SLEDMUX_SHIFT 13
  20. #define LED_INIT_SLEDMUX_MASK (1 << LED_INIT_SLEDMUX_SHIFT)
  21. #define LED_INIT_SLEDCLKNPOL_SHIFT 14
  22. #define LED_INIT_SLEDCLKNPOL_MASK (1 << LED_INIT_SLEDCLKNPOL_SHIFT)
  23. #define LED_INIT_SLEDDATAPPOL_SHIFT 15
  24. #define LED_INIT_SLEDDATANPOL_MASK (1 << LED_INIT_SLEDDATAPPOL_SHIFT)
  25. #define LED_INIT_SLEDSHIFTDIR_SHIFT 16
  26. #define LED_INIT_SLEDSHIFTDIR_MASK (1 << LED_INIT_SLEDSHIFTDIR_SHIFT)
  27. /* LED Mode registers */
  28. #define LED_MODE_REG_HI 0x04
  29. #define LED_MODE_REG_LO 0x08
  30. #define LED_MODE_ON 0
  31. #define LED_MODE_FAST 1
  32. #define LED_MODE_BLINK 2
  33. #define LED_MODE_OFF 3
  34. #define LED_MODE_MASK 0x3
  35. struct bcm6328_led_priv {
  36. void __iomem *regs;
  37. void __iomem *mode;
  38. uint8_t shift;
  39. bool active_low;
  40. };
  41. static unsigned long bcm6328_led_get_mode(struct bcm6328_led_priv *priv)
  42. {
  43. return ((readl_be(priv->mode) >> priv->shift) & LED_MODE_MASK);
  44. }
  45. static int bcm6328_led_set_mode(struct bcm6328_led_priv *priv, uint8_t mode)
  46. {
  47. clrsetbits_be32(priv->mode, (LED_MODE_MASK << priv->shift),
  48. (mode << priv->shift));
  49. return 0;
  50. }
  51. static enum led_state_t bcm6328_led_get_state(struct udevice *dev)
  52. {
  53. struct bcm6328_led_priv *priv = dev_get_priv(dev);
  54. enum led_state_t state = LEDST_OFF;
  55. switch (bcm6328_led_get_mode(priv)) {
  56. #ifdef CONFIG_LED_BLINK
  57. case LED_MODE_BLINK:
  58. case LED_MODE_FAST:
  59. state = LEDST_BLINK;
  60. break;
  61. #endif
  62. case LED_MODE_OFF:
  63. state = (priv->active_low ? LEDST_ON : LEDST_OFF);
  64. break;
  65. case LED_MODE_ON:
  66. state = (priv->active_low ? LEDST_OFF : LEDST_ON);
  67. break;
  68. }
  69. return state;
  70. }
  71. static int bcm6328_led_set_state(struct udevice *dev, enum led_state_t state)
  72. {
  73. struct bcm6328_led_priv *priv = dev_get_priv(dev);
  74. unsigned long mode;
  75. switch (state) {
  76. #ifdef CONFIG_LED_BLINK
  77. case LEDST_BLINK:
  78. mode = LED_MODE_BLINK;
  79. break;
  80. #endif
  81. case LEDST_OFF:
  82. mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
  83. break;
  84. case LEDST_ON:
  85. mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
  86. break;
  87. case LEDST_TOGGLE:
  88. if (bcm6328_led_get_state(dev) == LEDST_OFF)
  89. return bcm6328_led_set_state(dev, LEDST_ON);
  90. else
  91. return bcm6328_led_set_state(dev, LEDST_OFF);
  92. break;
  93. default:
  94. return -ENOSYS;
  95. }
  96. return bcm6328_led_set_mode(priv, mode);
  97. }
  98. #ifdef CONFIG_LED_BLINK
  99. static unsigned long bcm6328_blink_delay(int delay)
  100. {
  101. unsigned long bcm6328_delay = delay;
  102. bcm6328_delay += (LED_INIT_FASTINTV_MS / 2);
  103. bcm6328_delay /= LED_INIT_FASTINTV_MS;
  104. bcm6328_delay <<= LED_INIT_FASTINTV_SHIFT;
  105. if (bcm6328_delay > LED_INIT_FASTINTV_MASK)
  106. return LED_INIT_FASTINTV_MASK;
  107. else
  108. return bcm6328_delay;
  109. }
  110. static int bcm6328_led_set_period(struct udevice *dev, int period_ms)
  111. {
  112. struct bcm6328_led_priv *priv = dev_get_priv(dev);
  113. clrsetbits_be32(priv->regs + LED_INIT_REG, LED_INIT_FASTINTV_MASK,
  114. bcm6328_blink_delay(period_ms));
  115. return 0;
  116. }
  117. #endif
  118. static const struct led_ops bcm6328_led_ops = {
  119. .get_state = bcm6328_led_get_state,
  120. .set_state = bcm6328_led_set_state,
  121. #ifdef CONFIG_LED_BLINK
  122. .set_period = bcm6328_led_set_period,
  123. #endif
  124. };
  125. static int bcm6328_led_probe(struct udevice *dev)
  126. {
  127. struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
  128. /* Top-level LED node */
  129. if (!uc_plat->label) {
  130. void __iomem *regs;
  131. u32 set_bits = 0;
  132. regs = dev_remap_addr(dev);
  133. if (!regs)
  134. return -EINVAL;
  135. if (dev_read_bool(dev, "brcm,serial-leds"))
  136. set_bits |= LED_INIT_SLEDEN_MASK;
  137. if (dev_read_bool(dev, "brcm,serial-mux"))
  138. set_bits |= LED_INIT_SLEDMUX_MASK;
  139. if (dev_read_bool(dev, "brcm,serial-clk-low"))
  140. set_bits |= LED_INIT_SLEDCLKNPOL_MASK;
  141. if (!dev_read_bool(dev, "brcm,serial-dat-low"))
  142. set_bits |= LED_INIT_SLEDDATANPOL_MASK;
  143. if (!dev_read_bool(dev, "brcm,serial-shift-inv"))
  144. set_bits |= LED_INIT_SLEDSHIFTDIR_MASK;
  145. clrsetbits_be32(regs + LED_INIT_REG, ~0, set_bits);
  146. } else {
  147. struct bcm6328_led_priv *priv = dev_get_priv(dev);
  148. unsigned int pin;
  149. priv->regs = dev_remap_addr(dev_get_parent(dev));
  150. if (!priv->regs)
  151. return -EINVAL;
  152. pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
  153. if (pin >= LEDS_MAX)
  154. return -EINVAL;
  155. if (pin < 8) {
  156. /* LEDs 0-7 (bits 47:32) */
  157. priv->mode = priv->regs + LED_MODE_REG_HI;
  158. priv->shift = (pin << 1);
  159. } else {
  160. /* LEDs 8-23 (bits 31:0) */
  161. priv->mode = priv->regs + LED_MODE_REG_LO;
  162. priv->shift = ((pin - 8) << 1);
  163. }
  164. if (dev_read_bool(dev, "active-low"))
  165. priv->active_low = true;
  166. }
  167. return 0;
  168. }
  169. static int bcm6328_led_bind(struct udevice *parent)
  170. {
  171. ofnode node;
  172. dev_for_each_subnode(node, parent) {
  173. struct led_uc_plat *uc_plat;
  174. struct udevice *dev;
  175. const char *label;
  176. int ret;
  177. label = ofnode_read_string(node, "label");
  178. if (!label) {
  179. debug("%s: node %s has no label\n", __func__,
  180. ofnode_get_name(node));
  181. return -EINVAL;
  182. }
  183. ret = device_bind_driver_to_node(parent, "bcm6328-led",
  184. ofnode_get_name(node),
  185. node, &dev);
  186. if (ret)
  187. return ret;
  188. uc_plat = dev_get_uclass_platdata(dev);
  189. uc_plat->label = label;
  190. }
  191. return 0;
  192. }
  193. static const struct udevice_id bcm6328_led_ids[] = {
  194. { .compatible = "brcm,bcm6328-leds" },
  195. { /* sentinel */ }
  196. };
  197. U_BOOT_DRIVER(bcm6328_led) = {
  198. .name = "bcm6328-led",
  199. .id = UCLASS_LED,
  200. .of_match = bcm6328_led_ids,
  201. .ops = &bcm6328_led_ops,
  202. .bind = bcm6328_led_bind,
  203. .probe = bcm6328_led_probe,
  204. .priv_auto_alloc_size = sizeof(struct bcm6328_led_priv),
  205. };