led_cortina.c 7.0 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2020 Cortina-Access
  4. * Author: Jway Lin <jway.lin@cortina-access.com>
  5. *
  6. */
  7. #include <common.h>
  8. #include <dm.h>
  9. #include <errno.h>
  10. #include <led.h>
  11. #include <log.h>
  12. #include <asm/io.h>
  13. #include <dm/lists.h>
  14. #include <linux/bitops.h>
  15. #define LED_MAX_HW_BLINK 127
  16. #define LED_MAX_COUNT 16
  17. /* LED_CONTROL fields */
  18. #define LED_BLINK_RATE1_SHIFT 0
  19. #define LED_BLINK_RATE1_MASK 0xff
  20. #define LED_BLINK_RATE2_SHIFT 8
  21. #define LED_BLINK_RATE2_MASK 0xff
  22. #define LED_CLK_TEST BIT(16)
  23. #define LED_CLK_POLARITY BIT(17)
  24. #define LED_CLK_TEST_MODE BIT(16)
  25. #define LED_CLK_TEST_RX_TEST BIT(30)
  26. #define LED_CLK_TEST_TX_TEST BIT(31)
  27. /* LED_CONFIG fields */
  28. #define LED_EVENT_ON_SHIFT 0
  29. #define LED_EVENT_ON_MASK 0x7
  30. #define LED_EVENT_BLINK_SHIFT 3
  31. #define LED_EVENT_BLINK_MASK 0x7
  32. #define LED_EVENT_OFF_SHIFT 6
  33. #define LED_EVENT_OFF_MASK 0x7
  34. #define LED_OFF_ON_SHIFT 9
  35. #define LED_OFF_ON_MASK 0x3
  36. #define LED_PORT_SHIFT 11
  37. #define LED_PORT_MASK 0x7
  38. #define LED_OFF_VAL BIT(14)
  39. #define LED_SW_EVENT BIT(15)
  40. #define LED_BLINK_SEL BIT(16)
  41. /* LED_CONFIG structures */
  42. struct cortina_led_cfg {
  43. void __iomem *regs;
  44. u32 pin; /* LED pin nubmer */
  45. bool active_low; /*Active-High or Active-Low*/
  46. u32 off_event; /* set led off event (RX,TX,SW)*/
  47. u32 blink_event; /* set led blink event (RX,TX,SW)*/
  48. u32 on_event; /* set led on event (RX,TX,SW)*/
  49. u32 port; /* corresponding ethernet port */
  50. int blink_sel; /* select blink-rate1 or blink-rate2 */
  51. };
  52. /* LED_control structures */
  53. struct cortina_led_platdata {
  54. void __iomem *ctrl_regs;
  55. u16 rate1; /* blink rate setting 0 */
  56. u16 rate2; /* blink rate setting 1 */
  57. };
  58. enum ca_led_state_t {
  59. CA_EVENT_MODE = 0,
  60. CA_LED_ON = 1,
  61. CA_LED_OFF,
  62. };
  63. static void cortina_led_write(void __iomem *reg, unsigned long data)
  64. {
  65. writel(data, reg);
  66. }
  67. static unsigned long cortina_led_read(void __iomem *reg)
  68. {
  69. return readl(reg);
  70. }
  71. static enum led_state_t cortina_led_get_state(struct udevice *dev)
  72. {
  73. struct cortina_led_cfg *priv = dev_get_priv(dev);
  74. enum led_state_t state = LEDST_OFF;
  75. u32 val;
  76. val = readl(priv->regs);
  77. if (val & LED_SW_EVENT)
  78. state = LEDST_ON;
  79. return state;
  80. }
  81. static int cortina_led_set_state(struct udevice *dev, enum led_state_t state)
  82. {
  83. u32 val;
  84. struct cortina_led_cfg *priv = dev_get_priv(dev);
  85. val = readl(priv->regs);
  86. val &= ~(LED_OFF_ON_MASK << LED_OFF_ON_SHIFT);
  87. switch (state) {
  88. case LEDST_OFF:
  89. val &= ~LED_SW_EVENT;
  90. val |= CA_LED_OFF << LED_OFF_ON_SHIFT;
  91. cortina_led_write(priv->regs, val);
  92. break;
  93. case LEDST_ON:
  94. val |= LED_SW_EVENT;
  95. val |= CA_LED_ON << LED_OFF_ON_SHIFT;
  96. cortina_led_write(priv->regs, val);
  97. break;
  98. case LEDST_TOGGLE:
  99. if (cortina_led_get_state(dev) == LEDST_OFF)
  100. return cortina_led_set_state(dev, LEDST_ON);
  101. else
  102. return cortina_led_set_state(dev, LEDST_OFF);
  103. break;
  104. default:
  105. return -EINVAL;
  106. }
  107. return 0;
  108. }
  109. static const struct led_ops cortina_led_ops = {
  110. .get_state = cortina_led_get_state,
  111. .set_state = cortina_led_set_state,
  112. };
  113. static int ca_led_ofdata_to_platdata(struct udevice *dev)
  114. {
  115. struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
  116. /* Top-level LED node */
  117. if (!uc_plat->label) {
  118. struct cortina_led_platdata *plt = dev_get_platdata(dev);
  119. plt->rate1 =
  120. dev_read_u32_default(dev, "Cortina,blink-rate1", 256);
  121. plt->rate2 =
  122. dev_read_u32_default(dev, "Cortina,blink-rate2", 512);
  123. plt->ctrl_regs = dev_remap_addr(dev);
  124. } else {
  125. struct cortina_led_cfg *priv = dev_get_priv(dev);
  126. priv->regs = dev_remap_addr(dev_get_parent(dev));
  127. priv->pin = dev_read_u32_default(dev, "pin", LED_MAX_COUNT);
  128. priv->blink_sel = dev_read_u32_default(dev, "blink-sel", 0);
  129. priv->off_event = dev_read_u32_default(dev, "off-event", 0);
  130. priv->blink_event = dev_read_u32_default(dev, "blink-event", 0);
  131. priv->on_event = dev_read_u32_default(dev, "on-event", 0);
  132. priv->port = dev_read_u32_default(dev, "port", 0);
  133. if (dev_read_bool(dev, "active-low"))
  134. priv->active_low = true;
  135. else
  136. priv->active_low = false;
  137. }
  138. return 0;
  139. }
  140. static int cortina_led_probe(struct udevice *dev)
  141. {
  142. struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
  143. /* Top-level LED node */
  144. if (!uc_plat->label) {
  145. struct cortina_led_platdata *platdata = dev_get_platdata(dev);
  146. u32 reg_value, val;
  147. u16 rate1, rate2;
  148. if (!platdata->ctrl_regs)
  149. return -EINVAL;
  150. reg_value = 0;
  151. reg_value |= LED_CLK_POLARITY;
  152. rate1 = platdata->rate1;
  153. rate2 = platdata->rate2;
  154. val = rate1 / 16 - 1;
  155. rate1 = val > LED_MAX_HW_BLINK ?
  156. LED_MAX_HW_BLINK : val;
  157. reg_value |= (rate1 & LED_BLINK_RATE1_MASK) <<
  158. LED_BLINK_RATE1_SHIFT;
  159. val = rate2 / 16 - 1;
  160. rate2 = val > LED_MAX_HW_BLINK ?
  161. LED_MAX_HW_BLINK : val;
  162. reg_value |= (rate2 & LED_BLINK_RATE2_MASK) <<
  163. LED_BLINK_RATE2_SHIFT;
  164. cortina_led_write(platdata->ctrl_regs, reg_value);
  165. } else {
  166. struct cortina_led_cfg *priv = dev_get_priv(dev);
  167. void __iomem *regs;
  168. u32 val, port, off_event, blink_event, on_event;
  169. regs = priv->regs;
  170. if (!regs)
  171. return -EINVAL;
  172. if (priv->pin >= LED_MAX_COUNT)
  173. return -EINVAL;
  174. priv->regs = regs + 4 + priv->pin * 4;
  175. val = cortina_led_read(priv->regs);
  176. if (priv->active_low)
  177. val |= LED_OFF_VAL;
  178. else
  179. val &= ~LED_OFF_VAL;
  180. if (priv->blink_sel == 0)
  181. val &= ~LED_BLINK_SEL;
  182. else if (priv->blink_sel == 1)
  183. val |= LED_BLINK_SEL;
  184. off_event = priv->off_event;
  185. val &= ~(LED_EVENT_OFF_MASK << LED_EVENT_OFF_SHIFT);
  186. if (off_event != 0)
  187. val |= BIT(off_event) << LED_EVENT_OFF_SHIFT;
  188. blink_event = priv->blink_event;
  189. val &= ~(LED_EVENT_BLINK_MASK << LED_EVENT_BLINK_SHIFT);
  190. if (blink_event != 0)
  191. val |= BIT(blink_event) << LED_EVENT_BLINK_SHIFT;
  192. on_event = priv->on_event;
  193. val &= ~(LED_EVENT_ON_MASK << LED_EVENT_ON_SHIFT);
  194. if (on_event != 0)
  195. val |= BIT(on_event) << LED_EVENT_ON_SHIFT;
  196. port = priv->port;
  197. val &= ~(LED_PORT_MASK << LED_PORT_SHIFT);
  198. val |= port << LED_PORT_SHIFT;
  199. /* force off */
  200. val &= ~(LED_OFF_ON_MASK << LED_OFF_ON_SHIFT);
  201. val |= CA_LED_OFF << LED_OFF_ON_SHIFT;
  202. cortina_led_write(priv->regs, val);
  203. }
  204. return 0;
  205. }
  206. static int cortina_led_bind(struct udevice *parent)
  207. {
  208. ofnode node;
  209. dev_for_each_subnode(node, parent) {
  210. struct led_uc_plat *uc_plat;
  211. struct udevice *dev;
  212. const char *label;
  213. int ret;
  214. label = ofnode_read_string(node, "label");
  215. if (!label) {
  216. debug("%s: node %s has no label\n", __func__,
  217. ofnode_get_name(node));
  218. return -EINVAL;
  219. }
  220. ret = device_bind_driver_to_node(parent, "ca-leds",
  221. ofnode_get_name(node),
  222. node, &dev);
  223. if (ret)
  224. return ret;
  225. uc_plat = dev_get_uclass_platdata(dev);
  226. uc_plat->label = label;
  227. }
  228. return 0;
  229. }
  230. static const struct udevice_id ca_led_ids[] = {
  231. { .compatible = "cortina,ca-leds" },
  232. { /* sentinel */ }
  233. };
  234. U_BOOT_DRIVER(cortina_led) = {
  235. .name = "ca-leds",
  236. .id = UCLASS_LED,
  237. .of_match = ca_led_ids,
  238. .ofdata_to_platdata = ca_led_ofdata_to_platdata,
  239. .bind = cortina_led_bind,
  240. .probe = cortina_led_probe,
  241. .platdata_auto_alloc_size = sizeof(struct cortina_led_platdata),
  242. .priv_auto_alloc_size = sizeof(struct cortina_led_cfg),
  243. .ops = &cortina_led_ops,
  244. };