2 * EHCI-compliant USB host controller driver for NVIDIA Tegra SoCs
4 * Copyright (C) 2010 Google, Inc.
5 * Copyright (C) 2009 - 2013 NVIDIA Corporation
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19 #include <linux/clk.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/err.h>
22 #include <linux/gpio.h>
24 #include <linux/irq.h>
25 #include <linux/module.h>
27 #include <linux/of_device.h>
28 #include <linux/of_gpio.h>
29 #include <linux/platform_device.h>
30 #include <linux/pm_runtime.h>
31 #include <linux/reset.h>
32 #include <linux/slab.h>
33 #include <linux/usb/ehci_def.h>
34 #include <linux/usb/tegra_usb_phy.h>
35 #include <linux/usb.h>
36 #include <linux/usb/hcd.h>
37 #include <linux/usb/otg.h>
41 #define TEGRA_USB_BASE 0xC5000000
42 #define TEGRA_USB2_BASE 0xC5004000
43 #define TEGRA_USB3_BASE 0xC5008000
45 #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
47 #define TEGRA_USB_DMA_ALIGN 32
49 #define DRIVER_DESC "Tegra EHCI driver"
50 #define DRV_NAME "tegra-ehci"
52 static struct hc_driver __read_mostly tegra_ehci_hc_driver;
54 struct tegra_ehci_soc_config {
58 static int (*orig_hub_control)(struct usb_hcd *hcd,
59 u16 typeReq, u16 wValue, u16 wIndex,
60 char *buf, u16 wLength);
62 struct tegra_ehci_hcd {
63 struct tegra_usb_phy *phy;
65 struct reset_control *rst;
67 bool needs_double_reset;
68 enum tegra_usb_phy_port_speed port_speed;
71 static int tegra_ehci_internal_port_reset(
72 struct ehci_hcd *ehci,
73 u32 __iomem *portsc_reg
82 spin_lock_irqsave(&ehci->lock, flags);
83 saved_usbintr = ehci_readl(ehci, &ehci->regs->intr_enable);
84 /* disable USB interrupt */
85 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
86 spin_unlock_irqrestore(&ehci->lock, flags);
89 * Here we have to do Port Reset at most twice for
90 * Port Enable bit to be set.
92 for (i = 0; i < 2; i++) {
93 temp = ehci_readl(ehci, portsc_reg);
95 ehci_writel(ehci, temp, portsc_reg);
98 ehci_writel(ehci, temp, portsc_reg);
104 * Up to this point, Port Enable bit is
105 * expected to be set after 2 ms waiting.
106 * USB1 usually takes extra 45 ms, for safety,
107 * we take 100 ms as timeout.
109 temp = ehci_readl(ehci, portsc_reg);
110 } while (!(temp & PORT_PE) && tries--);
118 * Clear Connect Status Change bit if it's set.
119 * We can't clear PORT_PEC. It will also cause PORT_PE to be cleared.
122 ehci_writel(ehci, PORT_CSC, portsc_reg);
125 * Write to clear any interrupt status bits that might be set
128 temp = ehci_readl(ehci, &ehci->regs->status);
129 ehci_writel(ehci, temp, &ehci->regs->status);
131 /* restore original interrupt enable bits */
132 ehci_writel(ehci, saved_usbintr, &ehci->regs->intr_enable);
136 static int tegra_ehci_hub_control(
145 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
146 struct tegra_ehci_hcd *tegra = (struct tegra_ehci_hcd *)ehci->priv;
147 u32 __iomem *status_reg;
152 status_reg = &ehci->regs->port_status[(wIndex & 0xff) - 1];
154 spin_lock_irqsave(&ehci->lock, flags);
156 if (typeReq == GetPortStatus) {
157 temp = ehci_readl(ehci, status_reg);
158 if (tegra->port_resuming && !(temp & PORT_SUSPEND)) {
159 /* Resume completed, re-enable disconnect detection */
160 tegra->port_resuming = 0;
161 tegra_usb_phy_postresume(hcd->usb_phy);
165 else if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
166 temp = ehci_readl(ehci, status_reg);
167 if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
172 temp &= ~(PORT_RWC_BITS | PORT_WKCONN_E);
173 temp |= PORT_WKDISC_E | PORT_WKOC_E;
174 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
177 * If a transaction is in progress, there may be a delay in
178 * suspending the port. Poll until the port is suspended.
180 if (ehci_handshake(ehci, status_reg, PORT_SUSPEND,
182 pr_err("%s: timeout waiting for SUSPEND\n", __func__);
184 set_bit((wIndex & 0xff) - 1, &ehci->suspended_ports);
188 /* For USB1 port we need to issue Port Reset twice internally */
189 if (tegra->needs_double_reset &&
190 (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_RESET)) {
191 spin_unlock_irqrestore(&ehci->lock, flags);
192 return tegra_ehci_internal_port_reset(ehci, status_reg);
196 * Tegra host controller will time the resume operation to clear the bit
197 * when the port control state switches to HS or FS Idle. This behavior
198 * is different from EHCI where the host controller driver is required
199 * to set this bit to a zero after the resume duration is timed in the
202 else if (typeReq == ClearPortFeature &&
203 wValue == USB_PORT_FEAT_SUSPEND) {
204 temp = ehci_readl(ehci, status_reg);
205 if ((temp & PORT_RESET) || !(temp & PORT_PE)) {
210 if (!(temp & PORT_SUSPEND))
213 /* Disable disconnect detection during port resume */
214 tegra_usb_phy_preresume(hcd->usb_phy);
216 ehci->reset_done[wIndex-1] = jiffies + msecs_to_jiffies(25);
218 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
219 /* start resume signalling */
220 ehci_writel(ehci, temp | PORT_RESUME, status_reg);
221 set_bit(wIndex-1, &ehci->resuming_ports);
223 spin_unlock_irqrestore(&ehci->lock, flags);
225 spin_lock_irqsave(&ehci->lock, flags);
227 /* Poll until the controller clears RESUME and SUSPEND */
228 if (ehci_handshake(ehci, status_reg, PORT_RESUME, 0, 2000))
229 pr_err("%s: timeout waiting for RESUME\n", __func__);
230 if (ehci_handshake(ehci, status_reg, PORT_SUSPEND, 0, 2000))
231 pr_err("%s: timeout waiting for SUSPEND\n", __func__);
233 ehci->reset_done[wIndex-1] = 0;
234 clear_bit(wIndex-1, &ehci->resuming_ports);
236 tegra->port_resuming = 1;
240 spin_unlock_irqrestore(&ehci->lock, flags);
242 /* Handle the hub control events here */
243 return orig_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
246 spin_unlock_irqrestore(&ehci->lock, flags);
250 struct dma_aligned_buffer {
252 void *old_xfer_buffer;
256 static void free_dma_aligned_buffer(struct urb *urb)
258 struct dma_aligned_buffer *temp;
260 if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
263 temp = container_of(urb->transfer_buffer,
264 struct dma_aligned_buffer, data);
266 if (usb_urb_dir_in(urb))
267 memcpy(temp->old_xfer_buffer, temp->data,
268 urb->transfer_buffer_length);
269 urb->transfer_buffer = temp->old_xfer_buffer;
270 kfree(temp->kmalloc_ptr);
272 urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
275 static int alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
277 struct dma_aligned_buffer *temp, *kmalloc_ptr;
280 if (urb->num_sgs || urb->sg ||
281 urb->transfer_buffer_length == 0 ||
282 !((uintptr_t)urb->transfer_buffer & (TEGRA_USB_DMA_ALIGN - 1)))
285 /* Allocate a buffer with enough padding for alignment */
286 kmalloc_size = urb->transfer_buffer_length +
287 sizeof(struct dma_aligned_buffer) + TEGRA_USB_DMA_ALIGN - 1;
289 kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
293 /* Position our struct dma_aligned_buffer such that data is aligned */
294 temp = PTR_ALIGN(kmalloc_ptr + 1, TEGRA_USB_DMA_ALIGN) - 1;
295 temp->kmalloc_ptr = kmalloc_ptr;
296 temp->old_xfer_buffer = urb->transfer_buffer;
297 if (usb_urb_dir_out(urb))
298 memcpy(temp->data, urb->transfer_buffer,
299 urb->transfer_buffer_length);
300 urb->transfer_buffer = temp->data;
302 urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
307 static int tegra_ehci_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
312 ret = alloc_dma_aligned_buffer(urb, mem_flags);
316 ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
318 free_dma_aligned_buffer(urb);
323 static void tegra_ehci_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
325 usb_hcd_unmap_urb_for_dma(hcd, urb);
326 free_dma_aligned_buffer(urb);
329 static const struct tegra_ehci_soc_config tegra30_soc_config = {
333 static const struct tegra_ehci_soc_config tegra20_soc_config = {
337 static struct of_device_id tegra_ehci_of_match[] = {
338 { .compatible = "nvidia,tegra30-ehci", .data = &tegra30_soc_config },
339 { .compatible = "nvidia,tegra20-ehci", .data = &tegra20_soc_config },
343 static int tegra_ehci_probe(struct platform_device *pdev)
345 const struct of_device_id *match;
346 const struct tegra_ehci_soc_config *soc_config;
347 struct resource *res;
349 struct ehci_hcd *ehci;
350 struct tegra_ehci_hcd *tegra;
353 struct usb_phy *u_phy;
355 match = of_match_device(tegra_ehci_of_match, &pdev->dev);
357 dev_err(&pdev->dev, "Error: No device match found\n");
360 soc_config = match->data;
362 /* Right now device-tree probed devices don't get dma_mask set.
363 * Since shared usb code relies on it, set it here for now.
364 * Once we have dma capability bindings this can go away.
366 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
370 hcd = usb_create_hcd(&tegra_ehci_hc_driver, &pdev->dev,
371 dev_name(&pdev->dev));
373 dev_err(&pdev->dev, "Unable to create HCD\n");
376 platform_set_drvdata(pdev, hcd);
377 ehci = hcd_to_ehci(hcd);
378 tegra = (struct tegra_ehci_hcd *)ehci->priv;
382 tegra->clk = devm_clk_get(&pdev->dev, NULL);
383 if (IS_ERR(tegra->clk)) {
384 dev_err(&pdev->dev, "Can't get ehci clock\n");
385 err = PTR_ERR(tegra->clk);
386 goto cleanup_hcd_create;
389 tegra->rst = devm_reset_control_get(&pdev->dev, "usb");
390 if (IS_ERR(tegra->rst)) {
391 dev_err(&pdev->dev, "Can't get ehci reset\n");
392 err = PTR_ERR(tegra->rst);
393 goto cleanup_hcd_create;
396 err = clk_prepare_enable(tegra->clk);
398 goto cleanup_hcd_create;
400 reset_control_assert(tegra->rst);
402 reset_control_deassert(tegra->rst);
404 u_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);
406 err = PTR_ERR(u_phy);
409 hcd->usb_phy = u_phy;
411 tegra->needs_double_reset = of_property_read_bool(pdev->dev.of_node,
412 "nvidia,needs-double-reset");
414 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
416 dev_err(&pdev->dev, "Failed to get I/O memory\n");
420 hcd->rsrc_start = res->start;
421 hcd->rsrc_len = resource_size(res);
422 hcd->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
424 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
428 ehci->caps = hcd->regs + 0x100;
429 ehci->has_hostpc = soc_config->has_hostpc;
431 err = usb_phy_init(hcd->usb_phy);
433 dev_err(&pdev->dev, "Failed to initialize phy\n");
437 u_phy->otg = devm_kzalloc(&pdev->dev, sizeof(struct usb_otg),
440 dev_err(&pdev->dev, "Failed to alloc memory for otg\n");
444 u_phy->otg->host = hcd_to_bus(hcd);
446 err = usb_phy_set_suspend(hcd->usb_phy, 0);
448 dev_err(&pdev->dev, "Failed to power on the phy\n");
452 irq = platform_get_irq(pdev, 0);
454 dev_err(&pdev->dev, "Failed to get IRQ\n");
459 otg_set_host(u_phy->otg, &hcd->self);
461 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
463 dev_err(&pdev->dev, "Failed to add USB HCD\n");
464 goto cleanup_otg_set_host;
466 device_wakeup_enable(hcd->self.controller);
470 cleanup_otg_set_host:
471 otg_set_host(u_phy->otg, NULL);
473 usb_phy_shutdown(hcd->usb_phy);
475 clk_disable_unprepare(tegra->clk);
481 static int tegra_ehci_remove(struct platform_device *pdev)
483 struct usb_hcd *hcd = platform_get_drvdata(pdev);
484 struct tegra_ehci_hcd *tegra =
485 (struct tegra_ehci_hcd *)hcd_to_ehci(hcd)->priv;
487 otg_set_host(hcd->usb_phy->otg, NULL);
489 usb_phy_shutdown(hcd->usb_phy);
493 clk_disable_unprepare(tegra->clk);
498 static void tegra_ehci_hcd_shutdown(struct platform_device *pdev)
500 struct usb_hcd *hcd = platform_get_drvdata(pdev);
502 if (hcd->driver->shutdown)
503 hcd->driver->shutdown(hcd);
506 static struct platform_driver tegra_ehci_driver = {
507 .probe = tegra_ehci_probe,
508 .remove = tegra_ehci_remove,
509 .shutdown = tegra_ehci_hcd_shutdown,
512 .of_match_table = tegra_ehci_of_match,
516 static int tegra_ehci_reset(struct usb_hcd *hcd)
518 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
522 retval = ehci_setup(hcd);
527 * We should really pull this value out of tegra_ehci_soc_config, but
528 * to avoid needing access to it, make use of the fact that Tegra20 is
529 * the only one so far that needs a value of 10, and Tegra20 is the
530 * only one which doesn't set has_hostpc.
532 txfifothresh = ehci->has_hostpc ? 0x10 : 10;
533 ehci_writel(ehci, txfifothresh << 16, &ehci->regs->txfill_tuning);
538 static const struct ehci_driver_overrides tegra_overrides __initconst = {
539 .extra_priv_size = sizeof(struct tegra_ehci_hcd),
540 .reset = tegra_ehci_reset,
543 static int __init ehci_tegra_init(void)
548 pr_info(DRV_NAME ": " DRIVER_DESC "\n");
550 ehci_init_driver(&tegra_ehci_hc_driver, &tegra_overrides);
553 * The Tegra HW has some unusual quirks, which require Tegra-specific
554 * workarounds. We override certain hc_driver functions here to
555 * achieve that. We explicitly do not enhance ehci_driver_overrides to
556 * allow this more easily, since this is an unusual case, and we don't
557 * want to encourage others to override these functions by making it
561 orig_hub_control = tegra_ehci_hc_driver.hub_control;
563 tegra_ehci_hc_driver.map_urb_for_dma = tegra_ehci_map_urb_for_dma;
564 tegra_ehci_hc_driver.unmap_urb_for_dma = tegra_ehci_unmap_urb_for_dma;
565 tegra_ehci_hc_driver.hub_control = tegra_ehci_hub_control;
567 return platform_driver_register(&tegra_ehci_driver);
569 module_init(ehci_tegra_init);
571 static void __exit ehci_tegra_cleanup(void)
573 platform_driver_unregister(&tegra_ehci_driver);
575 module_exit(ehci_tegra_cleanup);
577 MODULE_DESCRIPTION(DRIVER_DESC);
578 MODULE_LICENSE("GPL");
579 MODULE_ALIAS("platform:" DRV_NAME);
580 MODULE_DEVICE_TABLE(of, tegra_ehci_of_match);