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 <log.h>
  10. #include <asm/io.h>
  11. #include <dm/lists.h>
  12. #define LEDS_MAX 24
  13. /* LED Init register */
  14. #define LED_INIT_REG 0x00
  15. #define LED_INIT_FASTINTV_MS 20
  16. #define LED_INIT_FASTINTV_SHIFT 6
  17. #define LED_INIT_FASTINTV_MASK (0x3f << LED_INIT_FASTINTV_SHIFT)
  18. #define LED_INIT_SLEDEN_SHIFT 12
  19. #define LED_INIT_SLEDEN_MASK (1 << LED_INIT_SLEDEN_SHIFT)
  20. #define LED_INIT_SLEDMUX_SHIFT 13
  21. #define LED_INIT_SLEDMUX_MASK (1 << LED_INIT_SLEDMUX_SHIFT)
  22. #define LED_INIT_SLEDCLKNPOL_SHIFT 14
  23. #define LED_INIT_SLEDCLKNPOL_MASK (1 << LED_INIT_SLEDCLKNPOL_SHIFT)
  24. #define LED_INIT_SLEDDATAPPOL_SHIFT 15
  25. #define LED_INIT_SLEDDATANPOL_MASK (1 << LED_INIT_SLEDDATAPPOL_SHIFT)
  26. #define LED_INIT_SLEDSHIFTDIR_SHIFT 16
  27. #define LED_INIT_SLEDSHIFTDIR_MASK (1 << LED_INIT_SLEDSHIFTDIR_SHIFT)
  28. /* LED Mode registers */
  29. #define LED_MODE_REG_HI 0x04
  30. #define LED_MODE_REG_LO 0x08
  31. #define LED_MODE_ON 0
  32. #define LED_MODE_FAST 1
  33. #define LED_MODE_BLINK 2
  34. #define LED_MODE_OFF 3
  35. #define LED_MODE_MASK 0x3
  36. struct bcm6328_led_priv {
  37. void __iomem *regs;
  38. void __iomem *mode;
  39. uint8_t shift;
  40. bool active_low;
  41. };
  42. static unsigned long bcm6328_led_get_mode(struct bcm6328_led_priv *priv)
  43. {
  44. return ((readl_be(priv->mode) >> priv->shift) & LED_MODE_MASK);
  45. }
  46. static int bcm6328_led_set_mode(struct bcm6328_led_priv *priv, uint8_t mode)
  47. {
  48. clrsetbits_be32(priv->mode, (LED_MODE_MASK << priv->shift),
  49. (mode << priv->shift));
  50. return 0;
  51. }
  52. static enum led_state_t bcm6328_led_get_state(struct udevice *dev)
  53. {
  54. struct bcm6328_led_priv *priv = dev_get_priv(dev);
  55. enum led_state_t state = LEDST_OFF;
  56. switch (bcm6328_led_get_mode(priv)) {
  57. #ifdef CONFIG_LED_BLINK
  58. case LED_MODE_BLINK:
  59. case LED_MODE_FAST:
  60. state = LEDST_BLINK;
  61. break;
  62. #endif
  63. case LED_MODE_OFF:
  64. state = (priv->active_low ? LEDST_ON : LEDST_OFF);
  65. break;
  66. case LED_MODE_ON:
  67. state = (priv->active_low ? LEDST_OFF : LEDST_ON);
  68. break;
  69. }
  70. return state;
  71. }
  72. static int bcm6328_led_set_state(struct udevice *dev, enum led_state_t state)
  73. {
  74. struct bcm6328_led_priv *priv = dev_get_priv(dev);
  75. unsigned long mode;
  76. switch (state) {
  77. #ifdef CONFIG_LED_BLINK
  78. case LEDST_BLINK:
  79. mode = LED_MODE_BLINK;
  80. break;
  81. #endif
  82. case LEDST_OFF:
  83. mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
  84. break;
  85. case LEDST_ON:
  86. mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
  87. break;
  88. case LEDST_TOGGLE:
  89. if (bcm6328_led_get_state(dev) == LEDST_OFF)
  90. return bcm6328_led_set_state(dev, LEDST_ON);
  91. else
  92. return bcm6328_led_set_state(dev, LEDST_OFF);
  93. break;
  94. default:
  95. return -ENOSYS;
  96. }
  97. return bcm6328_led_set_mode(priv, mode);
  98. }
  99. #ifdef CONFIG_LED_BLINK
  100. static unsigned long bcm6328_blink_delay(int delay)
  101. {
  102. unsigned long bcm6328_delay = delay;
  103. bcm6328_delay += (LED_INIT_FASTINTV_MS / 2);
  104. bcm6328_delay /= LED_INIT_FASTINTV_MS;
  105. bcm6328_delay <<= LED_INIT_FASTINTV_SHIFT;
  106. if (bcm6328_delay > LED_INIT_FASTINTV_MASK)
  107. return LED_INIT_FASTINTV_MASK;
  108. else
  109. return bcm6328_delay;
  110. }
  111. static int bcm6328_led_set_period(struct udevice *dev, int period_ms)
  112. {
  113. struct bcm6328_led_priv *priv = dev_get_priv(dev);
  114. clrsetbits_be32(priv->regs + LED_INIT_REG, LED_INIT_FASTINTV_MASK,
  115. bcm6328_blink_delay(period_ms));
  116. return 0;
  117. }
  118. #endif
  119. static const struct led_ops bcm6328_led_ops = {
  120. .get_state = bcm6328_led_get_state,
  121. .set_state = bcm6328_led_set_state,
  122. #ifdef CONFIG_LED_BLINK
  123. .set_period = bcm6328_led_set_period,
  124. #endif
  125. };
  126. static int bcm6328_led_probe(struct udevice *dev)
  127. {
  128. struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
  129. /* Top-level LED node */
  130. if (!uc_plat->label) {
  131. void __iomem *regs;
  132. u32 set_bits = 0;
  133. regs = dev_remap_addr(dev);
  134. if (!regs)
  135. return -EINVAL;
  136. if (dev_read_bool(dev, "brcm,serial-leds"))
  137. set_bits |= LED_INIT_SLEDEN_MASK;
  138. if (dev_read_bool(dev, "brcm,serial-mux"))
  139. set_bits |= LED_INIT_SLEDMUX_MASK;
  140. if (dev_read_bool(dev, "brcm,serial-clk-low"))
  141. set_bits |= LED_INIT_SLEDCLKNPOL_MASK;
  142. if (!dev_read_bool(dev, "brcm,serial-dat-low"))
  143. set_bits |= LED_INIT_SLEDDATANPOL_MASK;
  144. if (!dev_read_bool(dev, "brcm,serial-shift-inv"))
  145. set_bits |= LED_INIT_SLEDSHIFTDIR_MASK;
  146. clrsetbits_be32(regs + LED_INIT_REG, ~0, set_bits);
  147. } else {
  148. struct bcm6328_led_priv *priv = dev_get_priv(dev);
  149. unsigned int pin;
  150. priv->regs = dev_remap_addr(dev_get_parent(dev));
  151. if (!priv->regs)
  152. return -EINVAL;
  153. pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
  154. if (pin >= LEDS_MAX)
  155. return -EINVAL;
  156. if (pin < 8) {
  157. /* LEDs 0-7 (bits 47:32) */
  158. priv->mode = priv->regs + LED_MODE_REG_HI;
  159. priv->shift = (pin << 1);
  160. } else {
  161. /* LEDs 8-23 (bits 31:0) */
  162. priv->mode = priv->regs + LED_MODE_REG_LO;
  163. priv->shift = ((pin - 8) << 1);
  164. }
  165. if (dev_read_bool(dev, "active-low"))
  166. priv->active_low = true;
  167. }
  168. return 0;
  169. }
  170. static int bcm6328_led_bind(struct udevice *parent)
  171. {
  172. ofnode node;
  173. dev_for_each_subnode(node, parent) {
  174. struct led_uc_plat *uc_plat;
  175. struct udevice *dev;
  176. const char *label;
  177. int ret;
  178. label = ofnode_read_string(node, "label");
  179. if (!label) {
  180. debug("%s: node %s has no label\n", __func__,
  181. ofnode_get_name(node));
  182. return -EINVAL;
  183. }
  184. ret = device_bind_driver_to_node(parent, "bcm6328-led",
  185. ofnode_get_name(node),
  186. node, &dev);
  187. if (ret)
  188. return ret;
  189. uc_plat = dev_get_uclass_plat(dev);
  190. uc_plat->label = label;
  191. }
  192. return 0;
  193. }
  194. static const struct udevice_id bcm6328_led_ids[] = {
  195. { .compatible = "brcm,bcm6328-leds" },
  196. { /* sentinel */ }
  197. };
  198. U_BOOT_DRIVER(bcm6328_led) = {
  199. .name = "bcm6328-led",
  200. .id = UCLASS_LED,
  201. .of_match = bcm6328_led_ids,
  202. .ops = &bcm6328_led_ops,
  203. .bind = bcm6328_led_bind,
  204. .probe = bcm6328_led_probe,
  205. .priv_auto = sizeof(struct bcm6328_led_priv),
  206. };