venc-starfive.h 5.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Copyright (C) 2021 StarFive Technology Co., Ltd.
  4. */
  5. #ifndef __VENC_STARFIVE_H__
  6. #define __VENC_STARFIVE_H__
  7. #include <linux/io.h>
  8. #include <linux/clk.h>
  9. #include <linux/platform_device.h>
  10. #include <linux/reset.h>
  11. #include <linux/reset-controller.h>
  12. #include <linux/module.h>
  13. #include <linux/delay.h>
  14. #include <linux/clk-provider.h>
  15. #define VENC_ID_NUM 5
  16. struct starfive_venc_data {
  17. struct device *dev;
  18. struct clk *clk_venc_axi;
  19. struct clk *clk_vencbrg_main;
  20. struct clk *clk_venc_bclk;
  21. struct clk *clk_venc_cclk;
  22. struct clk *clk_venc_apb;
  23. struct reset_control *rst_vencbrg_main;
  24. struct reset_control *rst_venc_axi;
  25. struct reset_control *rst_venc_bclk;
  26. struct reset_control *rst_venc_cclk;
  27. struct reset_control *rst_venc_apb;
  28. struct clk *clk_venc_id[VENC_ID_NUM];
  29. struct reset_control *rst_venc_id[VENC_ID_NUM];
  30. };
  31. static struct starfive_venc_data *sf_venc = NULL;
  32. const char venc_data_id[VENC_ID_NUM][15] = {
  33. "venc_axi",
  34. "vencbrg_main",
  35. "venc_bclk",
  36. "venc_cclk",
  37. "venc_apb",
  38. };
  39. void starfive_venc_rst_status(void)
  40. {
  41. int i;
  42. int rst_state;
  43. for (i = 0; i < VENC_ID_NUM; i++) {
  44. rst_state = reset_control_status(sf_venc->rst_venc_id[i]);
  45. dev_dbg(sf_venc->dev, "status_rst %d :%d", i, rst_state);
  46. }
  47. return;
  48. }
  49. void starfive_venc_clk_status(void)
  50. {
  51. int i;
  52. int clk_state;
  53. for (i = 0; i < VENC_ID_NUM; i++) {
  54. clk_state = __clk_is_enabled(sf_venc->clk_venc_id[i]);
  55. dev_dbg(sf_venc->dev, "status_clk %d :%d", i, clk_state);
  56. }
  57. return;
  58. }
  59. void starfive_venc_rst_exit(void)
  60. {
  61. int i;
  62. int ret;
  63. for (i = 0; i < VENC_ID_NUM; i++) {
  64. /* Assert the reset of "vencbrg_main" could crash*/
  65. if (i != 1 ) {
  66. ret = reset_control_assert(sf_venc->rst_venc_id[i]);
  67. if (ret) {
  68. dev_err(sf_venc->dev, "reset assert failed\n");
  69. }
  70. }
  71. }
  72. return;
  73. }
  74. void starfive_venc_clk_exit(void)
  75. {
  76. int i;
  77. for (i = 0; i < VENC_ID_NUM; i++) {
  78. clk_disable_unprepare(sf_venc->clk_venc_id[i]);
  79. }
  80. return;
  81. }
  82. static int starfive_venc_clk_init(void)
  83. {
  84. int ret = 0;
  85. int i;
  86. for (i = 0; i < VENC_ID_NUM; i++) {
  87. ret = clk_prepare_enable(sf_venc->clk_venc_id[i]);
  88. if (ret) {
  89. dev_err(sf_venc->dev, venc_data_id[i]);
  90. goto init_clk_failed;
  91. }
  92. }
  93. return 0;
  94. init_clk_failed:
  95. for(; i > 0 ; i--) {
  96. clk_disable_unprepare(sf_venc->clk_venc_id[i-1]);
  97. }
  98. return ret;
  99. }
  100. static int starfive_venc_get_clk(void)
  101. {
  102. int ret = 0;
  103. int i;
  104. for ( i = 0; i < VENC_ID_NUM ; i++) {
  105. sf_venc->clk_venc_id[i] = devm_clk_get(sf_venc->dev, venc_data_id[i]);
  106. if (IS_ERR(sf_venc->clk_venc_id[i])) {
  107. dev_err(sf_venc->dev, venc_data_id[i]);
  108. ret = PTR_ERR(sf_venc->clk_venc_id[i]);
  109. goto get_clk_failed;
  110. }
  111. }
  112. return 0;
  113. get_clk_failed:
  114. for( ; i > 0 ; i--) {
  115. devm_clk_put(sf_venc->dev, sf_venc->clk_venc_id[i-1]);
  116. }
  117. return ret;
  118. }
  119. static int starfive_venc_reset_init(void)
  120. {
  121. int ret = 0;
  122. int i;
  123. for (i = 0; i < VENC_ID_NUM ; i++) {
  124. ret = reset_control_deassert(sf_venc->rst_venc_id[i]);
  125. if (ret) {
  126. dev_err(sf_venc->dev, venc_data_id[i]);
  127. goto init_reset_failed;
  128. }
  129. }
  130. return 0;
  131. init_reset_failed:
  132. for (; i > 0 ; i--) {
  133. reset_control_assert(sf_venc->rst_venc_id[i-1]);
  134. }
  135. return ret;
  136. }
  137. static int starfive_venc_get_resets(void)
  138. {
  139. int ret = 0;
  140. int i;
  141. for (i = 0; i < VENC_ID_NUM ; i++) {
  142. sf_venc->rst_venc_id[i] = devm_reset_control_get_exclusive(sf_venc->dev, venc_data_id[i]);
  143. if (IS_ERR(sf_venc->rst_venc_id[i])) {
  144. dev_err(sf_venc->dev, venc_data_id[i]);
  145. ret = PTR_ERR(sf_venc->rst_venc_id[i]);
  146. goto get_resets_failed;
  147. }
  148. }
  149. return 0;
  150. get_resets_failed:
  151. for (; i > 0; i--) {
  152. reset_control_put(sf_venc->rst_venc_id[i-1]);
  153. }
  154. return ret;
  155. }
  156. int starfive_venc_data_init(struct device *dev)
  157. {
  158. int ret = 0;
  159. if (sf_venc == NULL){
  160. sf_venc = devm_kzalloc(dev, sizeof(*sf_venc), GFP_KERNEL);
  161. if (!sf_venc)
  162. return -ENOMEM;
  163. sf_venc->dev = dev;
  164. ret = starfive_venc_get_clk();
  165. if (ret) {
  166. dev_err(sf_venc->dev, "failed to get venc clock\n");
  167. return ret;
  168. }
  169. ret = starfive_venc_get_resets();
  170. if (ret) {
  171. dev_err(sf_venc->dev, "failed to get venc resets\n");
  172. return ret;
  173. }
  174. }
  175. return 0;
  176. }
  177. int starfive_venc_clk_enable(struct device *dev)
  178. {
  179. int ret = 0;
  180. ret = starfive_venc_data_init(dev);
  181. if (ret)
  182. return ret;
  183. ret = starfive_venc_clk_init();
  184. if (ret) {
  185. dev_err(sf_venc->dev, "failed to enable venc clock\n");
  186. return ret;
  187. }
  188. return 0;
  189. }
  190. int starfive_venc_clk_disable(struct device *dev)
  191. {
  192. int ret = 0;
  193. ret = starfive_venc_data_init(dev);
  194. if (ret)
  195. return ret;
  196. starfive_venc_clk_exit();
  197. return 0;
  198. }
  199. int starfive_venc_rst_deassert(struct device *dev)
  200. {
  201. int ret = 0;
  202. ret = starfive_venc_data_init(dev);
  203. if (ret)
  204. return ret;
  205. ret = starfive_venc_reset_init();
  206. if (ret) {
  207. dev_err(sf_venc->dev, "failed to deassert venc resets\n");
  208. return ret;
  209. }
  210. return 0;
  211. }
  212. int starfive_venc_rst_assert(struct device *dev)
  213. {
  214. int ret = 0;
  215. ret = starfive_venc_data_init(dev);
  216. if (ret)
  217. return ret;
  218. starfive_venc_rst_exit();
  219. return 0;
  220. }
  221. int starfive_venc_clk_rst_init(struct platform_device *pdev)
  222. {
  223. int ret = 0;
  224. ret = starfive_venc_data_init(&pdev->dev);
  225. if (ret)
  226. return ret;
  227. ret = starfive_venc_clk_init();
  228. if (ret) {
  229. dev_err(sf_venc->dev, "failed to enable venc clock\n");
  230. return ret;
  231. }
  232. starfive_venc_rst_status();
  233. starfive_venc_rst_exit();
  234. mdelay(1);
  235. ret = starfive_venc_reset_init();
  236. if (ret) {
  237. dev_err(sf_venc->dev, "failed to set venc reset\n");
  238. goto init_failed;
  239. }
  240. starfive_venc_rst_status();
  241. printk("starfive venc clock & reset init success.");
  242. return 0;
  243. init_failed:
  244. starfive_venc_clk_exit();
  245. return ret;
  246. }
  247. #endif