bm_csi_driver.c 13 KB

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  1. /*
  2. * Copyright (C) 2021 Alibaba Group Holding Limited
  3. * Author: liuyitong <yitong.lyt@alibaba-inc.com>
  4. *
  5. * This program is free software; you can redistribute it and/or modify
  6. * it under the terms of the GNU General Public License version 2 as
  7. * published by the Free Software Foundation.
  8. */
  9. #include <asm/io.h>
  10. #include <linux/cdev.h>
  11. #include <linux/module.h>
  12. #include <linux/platform_device.h>
  13. #include <linux/delay.h>
  14. #include <linux/clk.h>
  15. #include <linux/io.h>
  16. #include <linux/mm.h>
  17. #include <linux/timer.h>
  18. #include <linux/kernel.h>
  19. #include <linux/init.h>
  20. #include <linux/ioctl.h>
  21. #include <linux/poll.h>
  22. #include <linux/workqueue.h>
  23. #include <linux/slab.h>
  24. #include <linux/proc_fs.h>
  25. #include <linux/debugfs.h>
  26. #include <linux/miscdevice.h>
  27. #include <linux/uaccess.h>
  28. #include <linux/interrupt.h>
  29. #include <linux/pm_runtime.h>
  30. #include <linux/of.h>
  31. #include "bm_printk.h"
  32. #include "bm_csi_ioctl.h"
  33. #include "bm_csi_hw.h"
  34. #include "bm_csi_dphy.h"
  35. #define BM_DRIVER_NAME "bm_csi"
  36. #define BM_DRIVER_MAXCNT 3
  37. static struct class *bm_driver_class;
  38. static unsigned int bm_driver_major = 0;
  39. static unsigned int bm_driver_minor = 0;
  40. static unsigned int device_register_index = 0;
  41. #define check_retval(x)\
  42. do {\
  43. if ((x))\
  44. return -EIO;\
  45. } while (0)
  46. static unsigned int bm_csi_poll(struct file * filp, poll_table *wait)
  47. {
  48. return 0;
  49. }
  50. void bm_csi_work(struct work_struct *work)
  51. {
  52. }
  53. irqreturn_t bm_csi_irq(int irq, void *dev_id)
  54. {
  55. bm_info("enter %s\n", __func__);
  56. return IRQ_HANDLED;
  57. }
  58. static int bm_csi_runtime_suspend(struct device *dev)
  59. {
  60. struct bm_csi_drvdata *pdriver_dev = dev_get_drvdata(dev);
  61. dev_info(dev, "enter %s\n", __func__);
  62. if (pdriver_dev->pclk != NULL) {
  63. clk_disable_unprepare(pdriver_dev->pclk);
  64. }
  65. if (pdriver_dev->pixclk!= NULL) {
  66. clk_disable_unprepare(pdriver_dev->pixclk);
  67. }
  68. if (pdriver_dev->cfg_clk0!= NULL) {
  69. clk_disable_unprepare(pdriver_dev->cfg_clk0);
  70. }
  71. if (pdriver_dev->cfg_clk1!= NULL) {
  72. clk_disable_unprepare(pdriver_dev->cfg_clk1);
  73. }
  74. if (pdriver_dev->cfg_clk2!= NULL) {
  75. clk_disable_unprepare(pdriver_dev->cfg_clk2);
  76. }
  77. pr_info("exit %s\n", __func__);
  78. return 0;
  79. }
  80. static int bm_csi_runtime_resume(struct device *dev)
  81. {
  82. int ret = 0;
  83. struct bm_csi_drvdata *pdriver_dev = dev_get_drvdata(dev);
  84. dev_info(dev, "enter %s\n", __func__);
  85. if (pdriver_dev->pclk != NULL) {
  86. ret = clk_prepare_enable(pdriver_dev->pclk);
  87. if (ret < 0) {
  88. dev_err(dev, "could not prepare or enable csi pclk\n");
  89. clk_disable_unprepare(pdriver_dev->pclk);
  90. return -1;
  91. }
  92. }
  93. if (pdriver_dev->pixclk!= NULL) {
  94. ret = clk_prepare_enable(pdriver_dev->pixclk);
  95. if (ret < 0) {
  96. dev_err(dev, "could not prepare or enable pixclk\n");
  97. clk_disable_unprepare(pdriver_dev->pixclk);
  98. return -1;
  99. }
  100. }
  101. if (pdriver_dev->cfg_clk0 != NULL) {
  102. ret = clk_prepare_enable(pdriver_dev->cfg_clk0);
  103. if (ret < 0) {
  104. dev_err(dev, "could not prepare or enable cfg_clk0\n");
  105. clk_disable_unprepare(pdriver_dev->cfg_clk0);
  106. return -1;
  107. }
  108. }
  109. if (pdriver_dev->cfg_clk1 != NULL) {
  110. ret = clk_prepare_enable(pdriver_dev->cfg_clk1);
  111. if (ret < 0) {
  112. dev_err(dev, "could not prepare or enable cfg_clk1\n");
  113. clk_disable_unprepare(pdriver_dev->cfg_clk1);
  114. return -1;
  115. }
  116. }
  117. if (pdriver_dev->cfg_clk2 != NULL) {
  118. ret = clk_prepare_enable(pdriver_dev->cfg_clk2);
  119. if (ret < 0) {
  120. dev_err(dev, "could not prepare or enable cfg_clk2\n");
  121. clk_disable_unprepare(pdriver_dev->cfg_clk2);
  122. return -1;
  123. }
  124. }
  125. pr_info("%s csi Enabled clock\n", __func__);
  126. return 0;
  127. }
  128. static const struct dev_pm_ops bm_csi_runtime_pm_ops = {
  129. SET_RUNTIME_PM_OPS(bm_csi_runtime_suspend, bm_csi_runtime_resume, NULL)
  130. };
  131. static int bm_csi_open(struct inode * inode, struct file * file)
  132. {
  133. int ret = 0;
  134. struct bm_csi_drvdata *drvdata;
  135. struct device *dev;
  136. bm_info("enter %s\n", __func__);
  137. dev_info(dev, "open mipi-csi dev\n");
  138. drvdata = container_of(inode->i_cdev, struct bm_csi_drvdata, cdev);
  139. file->private_data = drvdata;
  140. dev = &drvdata->pdev->dev;
  141. dev_info(dev, "open mipi-csi dev\n");
  142. if (pm_runtime_get_sync(dev)) {
  143. ret = bm_csi_runtime_resume(dev);
  144. if (ret)
  145. pr_err("fail to resume csi %s %d\n", __func__, __LINE__);
  146. }
  147. return 0;
  148. };
  149. static long bm_csi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
  150. {
  151. long ret = 0;
  152. struct bm_csi_drvdata *drvdata;
  153. bm_info("enter %s\n", __func__);
  154. drvdata = file->private_data;
  155. if (drvdata == NULL) {
  156. bm_err("%s:file private is null point error\n", __func__);
  157. return -ENOMEM;
  158. }
  159. mutex_lock(&drvdata->mutex);
  160. switch (cmd) {
  161. case BMCSI_IOC_WRITE_REG:
  162. ret = bm_csi_write_reg(drvdata, (void *)arg);
  163. break;
  164. case BMCSI_IOC_READ_REG:
  165. ret = bm_csi_read_reg(drvdata, (void *)arg);
  166. break;
  167. case BMCSI_IOC_S_RESET:
  168. ret = bm_csi_reset(drvdata, (void *)arg);
  169. break;
  170. case BMCSI_IOC_S_POWER:
  171. ret = bm_csi_set_power(drvdata, (void *)arg);
  172. break;
  173. case BMCSI_IOC_G_POWER:
  174. ret = bm_csi_get_power(drvdata, (void *)arg);
  175. break;
  176. case BMCSI_IOC_S_CLOCK:
  177. ret = bm_csi_set_clock(drvdata, (void *)arg);
  178. break;
  179. case BMCSI_IOC_G_CLOCK:
  180. ret = bm_csi_get_clock(drvdata, (void *)arg);
  181. break;
  182. case BMCSI_IOC_S_STREAM:
  183. ret = bm_csi_set_stream(drvdata, (void *)arg);
  184. break;
  185. case BMCSI_IOC_G_STREAM:
  186. ret = bm_csi_get_stream(drvdata, (void *)arg);
  187. break;
  188. case BMCSI_IOC_S_FMT:
  189. ret = bm_csi_set_fmt(drvdata, (void *)arg);
  190. break;
  191. case BMCSI_IOC_G_FMT:
  192. ret = bm_csi_get_fmt(drvdata, (void *)arg);
  193. break;
  194. case BMCSI_IOC_S_VC_SELECT:
  195. ret = bm_csi_set_vc_select(drvdata, (void *)arg);
  196. break;
  197. case BMCSI_IOC_G_VC_SELECT:
  198. ret = bm_csi_get_vc_select(drvdata, (void *)arg);
  199. break;
  200. case BMCSI_IOC_IPI_START:
  201. ret = bm_csi_ipi_enable(drvdata, (void *)arg);
  202. break;
  203. case BMCSI_IOC_IPI_STOP:
  204. ret = bm_csi_ipi_disable(drvdata, (void *)arg);
  205. break;
  206. case BMCSI_IOC_S_LANE_CFG:
  207. ret = bm_csi_set_lane_cfg(drvdata, (void *)arg);
  208. break;
  209. case BMCSI_IOC_S_HSA_CFG:
  210. ret = bm_csi_set_hsa(drvdata, (void *)arg);
  211. break;
  212. case BMCSI_IOC_S_HBP_CFG:
  213. ret = bm_csi_set_hbp(drvdata, (void *)arg);
  214. break;
  215. case BMCSI_IOC_S_HSD_CFG:
  216. ret = bm_csi_set_hsd(drvdata, (void *)arg);
  217. break;
  218. case BMCSI_IOC_SET_PIXCLK:
  219. ret = bm_csi_set_pixclk(drvdata, (void *)arg);
  220. break;
  221. case BMCSI_IOC_GET_PIXCLK:
  222. ret = bm_csi_get_pixclk(drvdata, (void *)arg);
  223. break;
  224. case BMCSI_IOC_MAX:
  225. break;
  226. default:
  227. ret = -EPERM;
  228. bm_err("%s: unsupported command %d", __func__, cmd);
  229. break;
  230. }
  231. mutex_unlock(&drvdata->mutex);
  232. return ret;
  233. };
  234. static int bm_csi_release(struct inode * inode, struct file * file)
  235. {
  236. int ret = 0;
  237. struct bm_csi_drvdata *drvdata;
  238. struct device *dev;
  239. bm_info("enter %s\n", __func__);
  240. drvdata = container_of(inode->i_cdev, struct bm_csi_drvdata, cdev);
  241. file->private_data = drvdata;
  242. dev = &drvdata->pdev->dev;
  243. dev_info(dev, "release mipi-csi dev\n");
  244. ret = bm_csi_dis_power(drvdata);
  245. if (ret) {
  246. pr_info("fail to disable csi power, %s %d\n", __func__, __LINE__);
  247. }
  248. ret = pm_runtime_put_sync(dev);
  249. if (ret) {
  250. pr_info("fail to resume csi %s %d\n", __func__, __LINE__);
  251. }
  252. return 0;
  253. };
  254. static int bm_csi_mmap(struct file *pFile, struct vm_area_struct *vma)
  255. {
  256. bm_info("enter %s\n", __func__);
  257. return 0;
  258. };
  259. struct file_operations bm_csi_fops = {
  260. .owner = THIS_MODULE,
  261. .open = bm_csi_open,
  262. .release = bm_csi_release,
  263. .unlocked_ioctl = bm_csi_ioctl,
  264. .mmap = bm_csi_mmap,
  265. .poll = bm_csi_poll,
  266. };
  267. static int bm_csi_probe(struct platform_device *pdev)
  268. {
  269. int ret = 0;
  270. struct bm_csi_drvdata *drvdata;
  271. struct resource *iores_mem;
  272. unsigned int dphyglueiftester= 0;
  273. unsigned int sysreg_mipi_csi_ctrl = 0;
  274. u32 value;
  275. bm_info("enter %s\n", __func__);
  276. pdev->id = device_register_index;
  277. if (pdev->id >= BM_DRIVER_MAXCNT) {
  278. bm_err("%s:pdev id is %d error\n", __func__, pdev->id);
  279. return -EINVAL;
  280. }
  281. drvdata = devm_kzalloc(&pdev->dev,sizeof(struct bm_csi_drvdata), GFP_KERNEL);
  282. if (drvdata == NULL) {
  283. bm_err("%s:alloc struct drvdata error\n", __func__);
  284. return -ENOMEM;
  285. }
  286. iores_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  287. drvdata->base = devm_ioremap_resource(&pdev->dev, iores_mem);
  288. bm_info("%s: [%s%d]: drvdata->base=0x%px, phy_addr base=0x%llx\n", __func__,
  289. BM_DRIVER_NAME, pdev->id, drvdata->base, iores_mem->start);
  290. drvdata->reset = NULL;
  291. drvdata->device_idx = pdev->id;
  292. mutex_init(&drvdata->mutex);
  293. drvdata->irq_num = platform_get_irq(pdev, 0);
  294. bm_info("%s:[%s%d]: pdriver_dev->irq_num=%d\n", __func__, "BM_CSI", pdev->id, drvdata->irq_num);
  295. drvdata->pdev = pdev;
  296. /*parse clk info from dts*/
  297. drvdata->pclk = devm_clk_get(&pdev->dev, "pclk");
  298. if (IS_ERR(drvdata->pclk)) {
  299. dev_err(&pdev->dev, "failed to get pclk");
  300. drvdata->pclk = NULL;
  301. }
  302. drvdata->pixclk = devm_clk_get(&pdev->dev, "pixclk");
  303. if (IS_ERR(drvdata->pixclk)) {
  304. dev_err(&pdev->dev, "failed to get pixclk");
  305. drvdata->pixclk = NULL;
  306. }
  307. drvdata->cfg_clk0 = devm_clk_get(&pdev->dev, "cfg_clk0");
  308. if (IS_ERR(drvdata->cfg_clk0)) {
  309. dev_err(&pdev->dev, "failed to get cfg_clk0");
  310. drvdata->cfg_clk0 = NULL;
  311. }
  312. drvdata->cfg_clk1 = devm_clk_get(&pdev->dev, "cfg_clk1");
  313. if (IS_ERR(drvdata->cfg_clk1)) {
  314. dev_err(&pdev->dev, "failed to get cfg_clk1");
  315. drvdata->cfg_clk1 = NULL;
  316. }
  317. drvdata->cfg_clk2 = devm_clk_get(&pdev->dev, "cfg_clk2");
  318. if (IS_ERR(drvdata->cfg_clk2)) {
  319. dev_err(&pdev->dev, "failed to get cfg_clk2");
  320. drvdata->cfg_clk2 = NULL;
  321. }
  322. platform_set_drvdata(pdev, drvdata);
  323. if (pdev->id == 0) {
  324. if (bm_driver_major == 0) {
  325. ret = alloc_chrdev_region(&drvdata->devt, 0, BM_DRIVER_MAXCNT, BM_DRIVER_NAME);
  326. if (ret != 0) {
  327. bm_err("%s:alloc_chrdev_region error\n", __func__);
  328. return ret;
  329. }
  330. bm_driver_major = MAJOR(drvdata->devt);
  331. bm_driver_minor = MINOR(drvdata->devt);
  332. } else {
  333. drvdata->devt = MKDEV(bm_driver_major, bm_driver_minor);
  334. ret = register_chrdev_region(drvdata->devt, BM_DRIVER_MAXCNT, BM_DRIVER_NAME);
  335. if (ret) {
  336. bm_err("%s:register_chrdev_region error\n", __func__);
  337. return ret;
  338. }
  339. }
  340. bm_driver_class = class_create(THIS_MODULE, BM_DRIVER_NAME);
  341. if (IS_ERR(bm_driver_class)) {
  342. bm_err("%s[%d]:class_create error!\n", __func__, __LINE__);
  343. return -EINVAL;
  344. }
  345. }
  346. drvdata->devt = MKDEV(bm_driver_major, bm_driver_minor + pdev->id);
  347. cdev_init(&drvdata->cdev, &bm_csi_fops);
  348. ret = cdev_add(&drvdata->cdev, drvdata->devt, 1);
  349. if ( ret ) {
  350. bm_err("%s[%d]:cdev_add error!\n", __func__, __LINE__);
  351. return ret;
  352. } else {
  353. bm_info("%s[%d]:cdev_add OK, major=%d, minor=%d\n", __func__, __LINE__,
  354. bm_driver_major, bm_driver_minor + pdev->id);
  355. }
  356. drvdata->class = bm_driver_class;
  357. device_create(drvdata->class, NULL, drvdata->devt,
  358. drvdata, "%s%d", BM_DRIVER_NAME, pdev->id);
  359. /*read version*/
  360. value = readl(drvdata->base + 0x0);
  361. bm_info("offset=04, value is:0x%08x\n", value);
  362. device_property_read_u32(&pdev->dev, "dphyglueiftester", &dphyglueiftester);
  363. bm_info("dphyglueiftester is:0x%x\n", dphyglueiftester);
  364. device_property_read_u32(&pdev->dev, "sysreg_mipi_csi_ctrl", &sysreg_mipi_csi_ctrl);
  365. bm_info("sysreg_mipi_csi_ctrl is:0x%x\n", sysreg_mipi_csi_ctrl);
  366. dw_dphy_rx_probe(pdev, dphyglueiftester, sysreg_mipi_csi_ctrl);
  367. dw_csi_probe(pdev);
  368. pm_runtime_enable(&pdev->dev);
  369. ret = bm_csi_runtime_resume(&pdev->dev);
  370. if (ret < 0) {
  371. dev_err(&pdev->dev, "fail to resume csi\n");
  372. }
  373. ret = bm_csi_runtime_suspend(&pdev->dev);
  374. if (ret < 0) {
  375. dev_err(&pdev->dev, "fail to suspend csi\n");
  376. }
  377. device_register_index++;
  378. bm_info("exit %s:[%s%d]\n", __func__, BM_DRIVER_NAME, pdev->id);
  379. return 0;
  380. }
  381. static int bm_csi_remove(struct platform_device *pdev)
  382. {
  383. struct bm_csi_drvdata *drvdata;
  384. bm_info("enter %s\n", __func__);
  385. dw_dphy_rx_remove(pdev);
  386. dw_csi_remove(pdev);
  387. device_register_index--;
  388. drvdata = platform_get_drvdata(pdev);
  389. free_irq(drvdata->irq_num, drvdata);
  390. cdev_del(&drvdata->cdev);
  391. device_destroy(drvdata->class, drvdata->devt);
  392. unregister_chrdev_region(drvdata->devt, BM_DRIVER_MAXCNT);
  393. mutex_destroy(&drvdata->mutex);
  394. if (device_register_index == 0) {
  395. class_destroy(drvdata->class);
  396. }
  397. devm_kfree(&pdev->dev, drvdata);
  398. bm_info("exit %s\n", __func__);
  399. return 0;
  400. }
  401. static const struct of_device_id bm_csi_of_match[] = {
  402. { .compatible = "thead,light-bm-csi", },
  403. { /* sentinel */ },
  404. };
  405. MODULE_DEVICE_TABLE(of, bm_csi_of_match);
  406. static struct platform_driver bm_csi_driver = {
  407. .probe = bm_csi_probe,
  408. .remove = bm_csi_remove,
  409. .driver = {
  410. .name = BM_DRIVER_NAME,
  411. .owner = THIS_MODULE,
  412. .of_match_table = of_match_ptr(bm_csi_of_match),
  413. .pm = &bm_csi_runtime_pm_ops,
  414. }
  415. };
  416. static int __init bm_csi_init_module(void)
  417. {
  418. int ret = 0;
  419. bm_info("enter %s\n", __func__);
  420. ret = platform_driver_register(&bm_csi_driver);
  421. if (ret) {
  422. bm_err("register platform driver failed.\n");
  423. return ret;
  424. }
  425. return ret;
  426. }
  427. static void __exit bm_csi_exit_module(void)
  428. {
  429. bm_info("enter %s\n", __func__);
  430. platform_driver_unregister(&bm_csi_driver);
  431. }
  432. module_init(bm_csi_init_module);
  433. module_exit(bm_csi_exit_module);
  434. MODULE_AUTHOR("Liu Yitong");
  435. MODULE_DESCRIPTION("BAREMETAL-CSI");
  436. MODULE_LICENSE("GPL");