1 // SPDX-License-Identifier: GPL-2.0
3 * host.c - ChipIdea USB host controller driver
5 * Copyright (c) 2012 Intel Corporation
7 * Author: Alexander Shishkin
10 #include <linux/kernel.h>
12 #include <linux/usb.h>
13 #include <linux/usb/hcd.h>
14 #include <linux/usb/chipidea.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/pinctrl/consumer.h>
18 #include "../host/ehci.h"
24 static struct hc_driver __read_mostly ci_ehci_hc_driver;
25 static int (*orig_bus_suspend)(struct usb_hcd *hcd);
28 struct regulator *reg_vbus;
32 struct ci_hdrc_dma_aligned_buffer {
33 void *original_buffer;
37 static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
39 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
40 struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
41 struct device *dev = hcd->self.controller;
42 struct ci_hdrc *ci = dev_get_drvdata(dev);
44 int port = HCS_N_PORTS(ehci->hcs_params);
46 if (priv->reg_vbus && enable != priv->enabled) {
49 "Not support multi-port regulator control\n");
53 ret = regulator_enable(priv->reg_vbus);
55 ret = regulator_disable(priv->reg_vbus);
58 "Failed to %s vbus regulator, ret=%d\n",
59 enable ? "enable" : "disable", ret);
62 priv->enabled = enable;
65 if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL) {
67 usb_phy_vbus_on(ci->usb_phy);
69 usb_phy_vbus_off(ci->usb_phy);
72 if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
74 * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
75 * As HSIC is always HS, this should be safe for others.
77 hw_port_test_set(ci, 5);
78 hw_port_test_set(ci, 0);
83 static int ehci_ci_reset(struct usb_hcd *hcd)
85 struct device *dev = hcd->self.controller;
86 struct ci_hdrc *ci = dev_get_drvdata(dev);
87 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
90 ret = ehci_setup(hcd);
94 ehci->need_io_watchdog = 0;
96 if (ci->platdata->notify_event) {
97 ret = ci->platdata->notify_event(ci,
98 CI_HDRC_CONTROLLER_RESET_EVENT);
103 ci_platform_configure(ci);
108 static const struct ehci_driver_overrides ehci_ci_overrides = {
109 .extra_priv_size = sizeof(struct ehci_ci_priv),
110 .port_power = ehci_ci_portpower,
111 .reset = ehci_ci_reset,
114 static irqreturn_t host_irq(struct ci_hdrc *ci)
116 return usb_hcd_irq(ci->irq, ci->hcd);
119 static int host_start(struct ci_hdrc *ci)
122 struct ehci_hcd *ehci;
123 struct ehci_ci_priv *priv;
129 hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
130 ci->dev, dev_name(ci->dev), NULL);
134 dev_set_drvdata(ci->dev, ci);
135 hcd->rsrc_start = ci->hw_bank.phys;
136 hcd->rsrc_len = ci->hw_bank.size;
137 hcd->regs = ci->hw_bank.abs;
140 hcd->power_budget = ci->platdata->power_budget;
141 hcd->tpl_support = ci->platdata->tpl_support;
142 if (ci->phy || ci->usb_phy) {
143 hcd->skip_phy_initialization = 1;
145 hcd->usb_phy = ci->usb_phy;
148 ehci = hcd_to_ehci(hcd);
149 ehci->caps = ci->hw_bank.cap;
150 ehci->has_hostpc = ci->hw_bank.lpm;
151 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
152 ehci->imx28_write_fix = ci->imx28_write_fix;
153 ehci->has_ci_pec_bug = ci->has_portsc_pec_bug;
155 priv = (struct ehci_ci_priv *)ehci->priv;
156 priv->reg_vbus = NULL;
158 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
159 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
160 ret = regulator_enable(ci->platdata->reg_vbus);
163 "Failed to enable vbus regulator, ret=%d\n",
168 priv->reg_vbus = ci->platdata->reg_vbus;
172 if (ci->platdata->pins_host)
173 pinctrl_select_state(ci->platdata->pctl,
174 ci->platdata->pins_host);
178 ret = usb_add_hcd(hcd, 0, 0);
183 struct usb_otg *otg = &ci->otg;
185 if (ci_otg_is_fsm_mode(ci)) {
186 otg->host = &hcd->self;
187 hcd->self.otg_port = 1;
190 if (ci->platdata->notify_event &&
191 (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC))
192 ci->platdata->notify_event
193 (ci, CI_HDRC_IMX_HSIC_ACTIVE_EVENT);
199 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
200 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
201 regulator_disable(ci->platdata->reg_vbus);
208 static void host_stop(struct ci_hdrc *ci)
210 struct usb_hcd *hcd = ci->hcd;
213 if (ci->platdata->notify_event)
214 ci->platdata->notify_event(ci,
215 CI_HDRC_CONTROLLER_STOPPED_EVENT);
217 ci->role = CI_ROLE_END;
218 synchronize_irq(ci->irq);
220 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
221 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
222 regulator_disable(ci->platdata->reg_vbus);
227 if (ci->platdata->pins_host && ci->platdata->pins_default)
228 pinctrl_select_state(ci->platdata->pctl,
229 ci->platdata->pins_default);
233 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
235 if (ci->role == CI_ROLE_HOST && ci->hcd)
239 /* The below code is based on tegra ehci driver */
240 static int ci_ehci_hub_control(
249 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
250 unsigned int ports = HCS_N_PORTS(ehci->hcs_params);
251 u32 __iomem *status_reg;
252 u32 temp, port_index;
256 struct device *dev = hcd->self.controller;
257 struct ci_hdrc *ci = dev_get_drvdata(dev);
259 port_index = wIndex & 0xff;
260 port_index -= (port_index > 0);
261 status_reg = &ehci->regs->port_status[port_index];
263 spin_lock_irqsave(&ehci->lock, flags);
265 if (ci->platdata->hub_control) {
266 retval = ci->platdata->hub_control(ci, typeReq, wValue, wIndex,
267 buf, wLength, &done, &flags);
272 if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
273 if (!wIndex || wIndex > ports) {
278 temp = ehci_readl(ehci, status_reg);
279 if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
284 temp &= ~(PORT_RWC_BITS | PORT_WKCONN_E);
285 temp |= PORT_WKDISC_E | PORT_WKOC_E;
286 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
289 * If a transaction is in progress, there may be a delay in
290 * suspending the port. Poll until the port is suspended.
292 if (ehci_handshake(ehci, status_reg, PORT_SUSPEND,
294 ehci_err(ehci, "timeout waiting for SUSPEND\n");
296 if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) {
297 if (ci->platdata->notify_event)
298 ci->platdata->notify_event(ci,
299 CI_HDRC_IMX_HSIC_SUSPEND_EVENT);
301 temp = ehci_readl(ehci, status_reg);
302 temp &= ~(PORT_WKDISC_E | PORT_WKCONN_E);
303 ehci_writel(ehci, temp, status_reg);
306 set_bit(port_index, &ehci->suspended_ports);
311 * After resume has finished, it needs do some post resume
312 * operation for some SoCs.
314 else if (typeReq == ClearPortFeature &&
315 wValue == USB_PORT_FEAT_C_SUSPEND) {
316 /* Make sure the resume has finished, it should be finished */
317 if (ehci_handshake(ehci, status_reg, PORT_RESUME, 0, 25000))
318 ehci_err(ehci, "timeout waiting for resume\n");
321 spin_unlock_irqrestore(&ehci->lock, flags);
323 /* Handle the hub control events here */
324 return ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
326 spin_unlock_irqrestore(&ehci->lock, flags);
329 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
331 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
332 struct device *dev = hcd->self.controller;
333 struct ci_hdrc *ci = dev_get_drvdata(dev);
337 int ret = orig_bus_suspend(hcd);
342 port = HCS_N_PORTS(ehci->hcs_params);
344 u32 __iomem *reg = &ehci->regs->port_status[port];
345 u32 portsc = ehci_readl(ehci, reg);
347 if (portsc & PORT_CONNECT) {
349 * For chipidea, the resume signal will be ended
350 * automatically, so for remote wakeup case, the
351 * usbcmd.rs may not be set before the resume has
352 * ended if other resume paths consumes too much
353 * time (~24ms), in that case, the SOF will not
354 * send out within 3ms after resume ends, then the
355 * high speed device will enter full speed mode.
358 tmp = ehci_readl(ehci, &ehci->regs->command);
360 ehci_writel(ehci, tmp, &ehci->regs->command);
362 * It needs a short delay between set RS bit and PHCD.
364 usleep_range(150, 200);
366 * Need to clear WKCN and WKOC for imx HSIC,
367 * otherwise, there will be wakeup event.
369 if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) {
370 tmp = ehci_readl(ehci, reg);
371 tmp &= ~(PORT_WKDISC_E | PORT_WKCONN_E);
372 ehci_writel(ehci, tmp, reg);
382 static void ci_hdrc_free_dma_aligned_buffer(struct urb *urb, bool copy_back)
384 struct ci_hdrc_dma_aligned_buffer *temp;
386 if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
388 urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
390 temp = container_of(urb->transfer_buffer,
391 struct ci_hdrc_dma_aligned_buffer, data);
392 urb->transfer_buffer = temp->original_buffer;
394 if (copy_back && usb_urb_dir_in(urb)) {
397 if (usb_pipeisoc(urb->pipe))
398 length = urb->transfer_buffer_length;
400 length = urb->actual_length;
402 memcpy(temp->original_buffer, temp->data, length);
408 static int ci_hdrc_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
410 struct ci_hdrc_dma_aligned_buffer *temp;
412 if (urb->num_sgs || urb->sg || urb->transfer_buffer_length == 0)
414 if (IS_ALIGNED((uintptr_t)urb->transfer_buffer, 4)
415 && IS_ALIGNED(urb->transfer_buffer_length, 4))
418 temp = kmalloc(sizeof(*temp) + ALIGN(urb->transfer_buffer_length, 4), mem_flags);
422 if (usb_urb_dir_out(urb))
423 memcpy(temp->data, urb->transfer_buffer,
424 urb->transfer_buffer_length);
426 temp->original_buffer = urb->transfer_buffer;
427 urb->transfer_buffer = temp->data;
428 urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
433 static int ci_hdrc_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
438 ret = ci_hdrc_alloc_dma_aligned_buffer(urb, mem_flags);
442 ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
444 ci_hdrc_free_dma_aligned_buffer(urb, false);
449 static void ci_hdrc_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
451 usb_hcd_unmap_urb_for_dma(hcd, urb);
452 ci_hdrc_free_dma_aligned_buffer(urb, true);
455 #ifdef CONFIG_PM_SLEEP
456 static void ci_hdrc_host_suspend(struct ci_hdrc *ci)
458 ehci_suspend(ci->hcd, device_may_wakeup(ci->dev));
461 static void ci_hdrc_host_resume(struct ci_hdrc *ci, bool power_lost)
463 ehci_resume(ci->hcd, power_lost);
467 int ci_hdrc_host_init(struct ci_hdrc *ci)
469 struct ci_role_driver *rdrv;
471 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
474 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
478 rdrv->start = host_start;
479 rdrv->stop = host_stop;
480 #ifdef CONFIG_PM_SLEEP
481 rdrv->suspend = ci_hdrc_host_suspend;
482 rdrv->resume = ci_hdrc_host_resume;
484 rdrv->irq = host_irq;
486 ci->roles[CI_ROLE_HOST] = rdrv;
488 if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA) {
489 ci_ehci_hc_driver.map_urb_for_dma = ci_hdrc_map_urb_for_dma;
490 ci_ehci_hc_driver.unmap_urb_for_dma = ci_hdrc_unmap_urb_for_dma;
496 void ci_hdrc_host_driver_init(void)
498 ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
499 orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
500 ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
501 ci_ehci_hc_driver.hub_control = ci_ehci_hub_control;