snps_udc_plat.c 7.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * snps_udc_plat.c - Synopsys UDC Platform Driver
  4. *
  5. * Copyright (C) 2016 Broadcom
  6. */
  7. #include <linux/extcon.h>
  8. #include <linux/of_address.h>
  9. #include <linux/of_irq.h>
  10. #include <linux/of_gpio.h>
  11. #include <linux/platform_device.h>
  12. #include <linux/phy/phy.h>
  13. #include <linux/module.h>
  14. #include <linux/dmapool.h>
  15. #include <linux/interrupt.h>
  16. #include <linux/moduleparam.h>
  17. #include "amd5536udc.h"
  18. /* description */
  19. #define UDC_MOD_DESCRIPTION "Synopsys UDC platform driver"
  20. static void start_udc(struct udc *udc)
  21. {
  22. if (udc->driver) {
  23. dev_info(udc->dev, "Connecting...\n");
  24. udc_enable_dev_setup_interrupts(udc);
  25. udc_basic_init(udc);
  26. udc->connected = 1;
  27. }
  28. }
  29. static void stop_udc(struct udc *udc)
  30. {
  31. int tmp;
  32. u32 reg;
  33. spin_lock(&udc->lock);
  34. /* Flush the receieve fifo */
  35. reg = readl(&udc->regs->ctl);
  36. reg |= AMD_BIT(UDC_DEVCTL_SRX_FLUSH);
  37. writel(reg, &udc->regs->ctl);
  38. reg = readl(&udc->regs->ctl);
  39. reg &= ~(AMD_BIT(UDC_DEVCTL_SRX_FLUSH));
  40. writel(reg, &udc->regs->ctl);
  41. dev_dbg(udc->dev, "ep rx queue flushed\n");
  42. /* Mask interrupts. Required more so when the
  43. * UDC is connected to a DRD phy.
  44. */
  45. udc_mask_unused_interrupts(udc);
  46. /* Disconnect gadget driver */
  47. if (udc->driver) {
  48. spin_unlock(&udc->lock);
  49. udc->driver->disconnect(&udc->gadget);
  50. spin_lock(&udc->lock);
  51. /* empty queues */
  52. for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
  53. empty_req_queue(&udc->ep[tmp]);
  54. }
  55. udc->connected = 0;
  56. spin_unlock(&udc->lock);
  57. dev_info(udc->dev, "Device disconnected\n");
  58. }
  59. static void udc_drd_work(struct work_struct *work)
  60. {
  61. struct udc *udc;
  62. udc = container_of(to_delayed_work(work),
  63. struct udc, drd_work);
  64. if (udc->conn_type) {
  65. dev_dbg(udc->dev, "idle -> device\n");
  66. start_udc(udc);
  67. } else {
  68. dev_dbg(udc->dev, "device -> idle\n");
  69. stop_udc(udc);
  70. }
  71. }
  72. static int usbd_connect_notify(struct notifier_block *self,
  73. unsigned long event, void *ptr)
  74. {
  75. struct udc *udc = container_of(self, struct udc, nb);
  76. dev_dbg(udc->dev, "%s: event: %lu\n", __func__, event);
  77. udc->conn_type = event;
  78. schedule_delayed_work(&udc->drd_work, 0);
  79. return NOTIFY_OK;
  80. }
  81. static int udc_plat_probe(struct platform_device *pdev)
  82. {
  83. struct device *dev = &pdev->dev;
  84. struct resource *res;
  85. struct udc *udc;
  86. int ret;
  87. udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
  88. if (!udc)
  89. return -ENOMEM;
  90. spin_lock_init(&udc->lock);
  91. udc->dev = dev;
  92. res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  93. udc->virt_addr = devm_ioremap_resource(dev, res);
  94. if (IS_ERR(udc->virt_addr))
  95. return PTR_ERR(udc->virt_addr);
  96. /* udc csr registers base */
  97. udc->csr = udc->virt_addr + UDC_CSR_ADDR;
  98. /* dev registers base */
  99. udc->regs = udc->virt_addr + UDC_DEVCFG_ADDR;
  100. /* ep registers base */
  101. udc->ep_regs = udc->virt_addr + UDC_EPREGS_ADDR;
  102. /* fifo's base */
  103. udc->rxfifo = (u32 __iomem *)(udc->virt_addr + UDC_RXFIFO_ADDR);
  104. udc->txfifo = (u32 __iomem *)(udc->virt_addr + UDC_TXFIFO_ADDR);
  105. udc->phys_addr = (unsigned long)res->start;
  106. udc->irq = irq_of_parse_and_map(dev->of_node, 0);
  107. if (udc->irq <= 0) {
  108. dev_err(dev, "Can't parse and map interrupt\n");
  109. return -EINVAL;
  110. }
  111. udc->udc_phy = devm_of_phy_get_by_index(dev, dev->of_node, 0);
  112. if (IS_ERR(udc->udc_phy)) {
  113. dev_err(dev, "Failed to obtain phy from device tree\n");
  114. return PTR_ERR(udc->udc_phy);
  115. }
  116. ret = phy_init(udc->udc_phy);
  117. if (ret) {
  118. dev_err(dev, "UDC phy init failed");
  119. return ret;
  120. }
  121. ret = phy_power_on(udc->udc_phy);
  122. if (ret) {
  123. dev_err(dev, "UDC phy power on failed");
  124. phy_exit(udc->udc_phy);
  125. return ret;
  126. }
  127. /* Register for extcon if supported */
  128. if (of_get_property(dev->of_node, "extcon", NULL)) {
  129. udc->edev = extcon_get_edev_by_phandle(dev, 0);
  130. if (IS_ERR(udc->edev)) {
  131. if (PTR_ERR(udc->edev) == -EPROBE_DEFER)
  132. return -EPROBE_DEFER;
  133. dev_err(dev, "Invalid or missing extcon\n");
  134. ret = PTR_ERR(udc->edev);
  135. goto exit_phy;
  136. }
  137. udc->nb.notifier_call = usbd_connect_notify;
  138. ret = extcon_register_notifier(udc->edev, EXTCON_USB,
  139. &udc->nb);
  140. if (ret < 0) {
  141. dev_err(dev, "Can't register extcon device\n");
  142. goto exit_phy;
  143. }
  144. ret = extcon_get_state(udc->edev, EXTCON_USB);
  145. if (ret < 0) {
  146. dev_err(dev, "Can't get cable state\n");
  147. goto exit_extcon;
  148. } else if (ret) {
  149. udc->conn_type = ret;
  150. }
  151. INIT_DELAYED_WORK(&udc->drd_work, udc_drd_work);
  152. }
  153. /* init dma pools */
  154. if (use_dma) {
  155. ret = init_dma_pools(udc);
  156. if (ret != 0)
  157. goto exit_extcon;
  158. }
  159. ret = devm_request_irq(dev, udc->irq, udc_irq, IRQF_SHARED,
  160. "snps-udc", udc);
  161. if (ret < 0) {
  162. dev_err(dev, "Request irq %d failed for UDC\n", udc->irq);
  163. goto exit_dma;
  164. }
  165. platform_set_drvdata(pdev, udc);
  166. udc->chiprev = UDC_BCM_REV;
  167. if (udc_probe(udc)) {
  168. ret = -ENODEV;
  169. goto exit_dma;
  170. }
  171. dev_info(dev, "Synopsys UDC platform driver probe successful\n");
  172. return 0;
  173. exit_dma:
  174. if (use_dma)
  175. free_dma_pools(udc);
  176. exit_extcon:
  177. if (udc->edev)
  178. extcon_unregister_notifier(udc->edev, EXTCON_USB, &udc->nb);
  179. exit_phy:
  180. if (udc->udc_phy) {
  181. phy_power_off(udc->udc_phy);
  182. phy_exit(udc->udc_phy);
  183. }
  184. return ret;
  185. }
  186. static int udc_plat_remove(struct platform_device *pdev)
  187. {
  188. struct udc *dev;
  189. dev = platform_get_drvdata(pdev);
  190. usb_del_gadget_udc(&dev->gadget);
  191. /* gadget driver must not be registered */
  192. if (WARN_ON(dev->driver))
  193. return 0;
  194. /* dma pool cleanup */
  195. free_dma_pools(dev);
  196. udc_remove(dev);
  197. platform_set_drvdata(pdev, NULL);
  198. if (dev->drd_wq) {
  199. flush_workqueue(dev->drd_wq);
  200. destroy_workqueue(dev->drd_wq);
  201. }
  202. phy_power_off(dev->udc_phy);
  203. phy_exit(dev->udc_phy);
  204. extcon_unregister_notifier(dev->edev, EXTCON_USB, &dev->nb);
  205. dev_info(&pdev->dev, "Synopsys UDC platform driver removed\n");
  206. return 0;
  207. }
  208. #ifdef CONFIG_PM_SLEEP
  209. static int udc_plat_suspend(struct device *dev)
  210. {
  211. struct udc *udc;
  212. udc = dev_get_drvdata(dev);
  213. stop_udc(udc);
  214. if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
  215. dev_dbg(udc->dev, "device -> idle\n");
  216. stop_udc(udc);
  217. }
  218. phy_power_off(udc->udc_phy);
  219. phy_exit(udc->udc_phy);
  220. return 0;
  221. }
  222. static int udc_plat_resume(struct device *dev)
  223. {
  224. struct udc *udc;
  225. int ret;
  226. udc = dev_get_drvdata(dev);
  227. ret = phy_init(udc->udc_phy);
  228. if (ret) {
  229. dev_err(udc->dev, "UDC phy init failure");
  230. return ret;
  231. }
  232. ret = phy_power_on(udc->udc_phy);
  233. if (ret) {
  234. dev_err(udc->dev, "UDC phy power on failure");
  235. phy_exit(udc->udc_phy);
  236. return ret;
  237. }
  238. if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
  239. dev_dbg(udc->dev, "idle -> device\n");
  240. start_udc(udc);
  241. }
  242. return 0;
  243. }
  244. static const struct dev_pm_ops udc_plat_pm_ops = {
  245. .suspend = udc_plat_suspend,
  246. .resume = udc_plat_resume,
  247. };
  248. #endif
  249. #if defined(CONFIG_OF)
  250. static const struct of_device_id of_udc_match[] = {
  251. { .compatible = "brcm,ns2-udc", },
  252. { .compatible = "brcm,cygnus-udc", },
  253. { .compatible = "brcm,iproc-udc", },
  254. { }
  255. };
  256. MODULE_DEVICE_TABLE(of, of_udc_match);
  257. #endif
  258. static struct platform_driver udc_plat_driver = {
  259. .probe = udc_plat_probe,
  260. .remove = udc_plat_remove,
  261. .driver = {
  262. .name = "snps-udc-plat",
  263. .of_match_table = of_match_ptr(of_udc_match),
  264. #ifdef CONFIG_PM_SLEEP
  265. .pm = &udc_plat_pm_ops,
  266. #endif
  267. },
  268. };
  269. module_platform_driver(udc_plat_driver);
  270. MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
  271. MODULE_AUTHOR("Broadcom");
  272. MODULE_LICENSE("GPL v2");