// SPDX-License-Identifier: GPL-1.0+
/*
* OHCI HCD (Host Controller Driver) for USB.
*
* Copyright (C) 2004 SAN People (Pty) Ltd.
* Copyright (C) 2005 Thibaut VARENE <[email protected]>
*
* AT91 Bus Glue
*
* Based on fragments of 2.4 driver by Rick Bronson.
* Based on ohci-omap.c
*
* This file is licenced under the GPL.
*/
#include <linux/arm-smccc.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/platform_data/atmel.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <soc/at91/atmel-sfr.h>
#include "ohci.h"
#define valid_port(index) ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
#define at91_for_each_port(index) \
for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
/* interface, function and usb clocks; sometimes also an AHB clock */
#define hcd_to_ohci_at91_priv(h) \
((struct ohci_at91_priv *)hcd_to_ohci(h)->priv)
#define AT91_MAX_USBH_PORTS 3
struct at91_usbh_data {
struct gpio_desc *vbus_pin[AT91_MAX_USBH_PORTS];
struct gpio_desc *overcurrent_pin[AT91_MAX_USBH_PORTS];
u8 ports; /* number of ports on root hub */
u8 overcurrent_supported;
u8 overcurrent_status[AT91_MAX_USBH_PORTS];
u8 overcurrent_changed[AT91_MAX_USBH_PORTS];
};
struct ohci_at91_priv {
struct clk *iclk;
struct clk *fclk;
struct clk *hclk;
bool clocked;
bool wakeup; /* Saved wake-up state for resume */
struct regmap *sfr_regmap;
u32 suspend_smc_id;
};
/* interface and function clocks; sometimes also an AHB clock */
#define DRIVER_DESC "OHCI Atmel driver"
static struct hc_driver __read_mostly ohci_at91_hc_driver;
static const struct ohci_driver_overrides ohci_at91_drv_overrides __initconst = {
.extra_priv_size = sizeof(struct ohci_at91_priv),
};
/*-------------------------------------------------------------------------*/
static void at91_start_clock(struct ohci_at91_priv *ohci_at91)
{
if (ohci_at91->clocked)
return;
clk_set_rate(ohci_at91->fclk, 48000000);
clk_prepare_enable(ohci_at91->hclk);
clk_prepare_enable(ohci_at91->iclk);
clk_prepare_enable(ohci_at91->fclk);
ohci_at91->clocked = true;
}
static void at91_stop_clock(struct ohci_at91_priv *ohci_at91)
{
if (!ohci_at91->clocked)
return;
clk_disable_unprepare(ohci_at91->fclk);
clk_disable_unprepare(ohci_at91->iclk);
clk_disable_unprepare(ohci_at91->hclk);
ohci_at91->clocked = false;
}
static void at91_start_hc(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_regs __iomem *regs = hcd->regs;
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
dev_dbg(&pdev->dev, "start\n");
/*
* Start the USB clocks.
*/
at91_start_clock(ohci_at91);
/*
* The USB host controller must remain in reset.
*/
writel(0, ®s->control);
}
static void at91_stop_hc(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
dev_dbg(&pdev->dev, "stop\n");
/*
* Put the USB host controller into reset.
*/
usb_hcd_platform_shutdown(pdev);
/*
* Stop the USB clocks.
*/
at91_stop_clock(ohci_at91);
}
/*-------------------------------------------------------------------------*/
static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
static u32 at91_dt_suspend_smc(struct device *dev)
{
u32 suspend_smc_id;
if (!dev->of_node)
return 0;
if (of_property_read_u32(dev->of_node, "microchip,suspend-smc-id", &suspend_smc_id))
return 0;
return suspend_smc_id;
}
static struct regmap *at91_dt_syscon_sfr(void)
{
struct regmap *regmap;
regmap = syscon_regmap_lookup_by_compatible("atmel,sama5d2-sfr");
if (IS_ERR(regmap)) {
regmap = syscon_regmap_lookup_by_compatible("microchip,sam9x60-sfr");
if (IS_ERR(regmap))
regmap = NULL;
}
return regmap;
}
/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */
/*
* usb_hcd_at91_probe - initialize AT91-based HCDs
* @driver: Pointer to hc driver instance
* @pdev: USB controller to probe
*
* Context: task context, might sleep
*
* Allocates basic resources for this USB host controller, and
* then invokes the start() method for the HCD associated with it
* through the hotplug entry's driver_data.
*/
static int usb_hcd_at91_probe(const struct hc_driver *driver,
struct platform_device *pdev)
{
struct at91_usbh_data *board;
struct ohci_hcd *ohci;
int retval;
struct usb_hcd *hcd;
struct ohci_at91_priv *ohci_at91;
struct device *dev = &pdev->dev;
struct resource *res;
int irq;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
hcd = usb_create_hcd(driver, dev, "at91");
if (!hcd)
return -ENOMEM;
ohci_at91 = hcd_to_ohci_at91_priv(hcd);
hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(hcd->regs)) {
retval = PTR_ERR(hcd->regs);
goto err;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
ohci_at91->iclk = devm_clk_get(dev, "ohci_clk");
if (IS_ERR(ohci_at91->iclk)) {
dev_err(dev, "failed to get ohci_clk\n");
retval = PTR_ERR(ohci_at91->iclk);
goto err;
}
ohci_at91->fclk = devm_clk_get(dev, "uhpck");
if (IS_ERR(ohci_at91->fclk)) {
dev_err(dev, "failed to get uhpck\n");
retval = PTR_ERR(ohci_at91->fclk);
goto err;
}
ohci_at91->hclk = devm_clk_get(dev, "hclk");
if (IS_ERR(ohci_at91->hclk)) {
dev_err(dev, "failed to get hclk\n");
retval = PTR_ERR(ohci_at91->hclk);
goto err;
}
ohci_at91->suspend_smc_id = at91_dt_suspend_smc(dev);
if (!ohci_at91->suspend_smc_id) {
dev_dbg(dev, "failed to find sfr suspend smc id, using regmap\n");
ohci_at91->sfr_regmap = at91_dt_syscon_sfr();
if (!ohci_at91->sfr_regmap)
dev_dbg(dev, "failed to find sfr node\n");
}
board = hcd->self.controller->platform_data;
ohci = hcd_to_ohci(hcd);
ohci->num_ports = board->ports;
at91_start_hc(pdev);
/*
* The RemoteWakeupConnected bit has to be set explicitly
* before calling ohci_run. The reset value of this bit is 0.
*/
ohci->hc_control = OHCI_CTRL_RWC;
retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (retval == 0) {
device_wakeup_enable(hcd->self.controller);
return retval;
}
/* Error handling */
at91_stop_hc(pdev);
err:
usb_put_hcd(hcd);
return retval;
}
/* may be called with controller, bus, and devices active */
/*
* usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
* @hcd: USB controller to remove
* @pdev: Platform device required for cleanup
*
* Context: task context, might sleep
*
* Reverses the effect of usb_hcd_at91_probe(), first invoking
* the HCD's stop() method. It is always called from a thread
* context, "rmmod" or something similar.
*/
static void usb_hcd_at91_remove(struct usb_hcd *hcd,
struct platform_device *pdev)
{
usb_remove_hcd(hcd);
at91_stop_hc(pdev);
usb_put_hcd(hcd);
}
/*-------------------------------------------------------------------------*/
static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
{
if (!valid_port(port))
return;
gpiod_set_value(pdata->vbus_pin[port], enable);
}
static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
{
if (!valid_port(port))
return -EINVAL;
return gpiod_get_value(pdata->vbus_pin[port]);
}
/*
* Update the status data from the hub with the over-current indicator change.
*/
static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
{
struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
int length = ohci_hub_status_data(hcd, buf);
int port;
at91_for_each_port(port) {
if (pdata->overcurrent_changed[port]) {
if (!length)
length = 1;
buf[0] |= 1 << (port + 1);
}
}
return length;
}
static int ohci_at91_port_suspend(struct ohci_at91_priv *ohci_at91, u8 set)
{
struct regmap *regmap = ohci_at91->sfr_regmap;
u32 regval;
int ret;
if (ohci_at91->suspend_smc_id) {
struct arm_smccc_res res;
arm_smccc_smc(ohci_at91->suspend_smc_id, set, 0, 0, 0, 0, 0, 0, &res);
if (res.a0)
return -EINVAL;
} else if (regmap) {
ret = regmap_read(regmap, AT91_SFR_OHCIICR, ®val);
if (ret)
return ret;
if (set)
regval |= AT91_OHCIICR_USB_SUSPEND;
else
regval &= ~AT91_OHCIICR_USB_SUSPEND;
regmap_write(regmap, AT91_SFR_OHCIICR, regval);
}
return 0;
}
/*
* Look at the control requests to the root hub and see if we need to override.
*/
static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
u16 wIndex, char *buf, u16 wLength)
{
struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
struct usb_hub_descriptor *desc;
int ret = -EINVAL;
u32 *data = (u32 *)buf;
dev_dbg(hcd->self.controller,
"ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
hcd, typeReq, wValue, wIndex, buf, wLength);
wIndex--;
switch (typeReq) {
case SetPortFeature:
switch (wValue) {
case USB_PORT_FEAT_POWER:
dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
if (valid_port(wIndex)) {
ohci_at91_usb_set_power(pdata, wIndex, 1);
ret = 0;
}
goto out;
case USB_PORT_FEAT_SUSPEND:
dev_dbg(hcd->self.controller, "SetPortFeat: SUSPEND\n");
if (valid_port(wIndex)) {
ohci_at91_port_suspend(ohci_at91, 1);
return 0;
}
break;
}
break;
case ClearPortFeature:
switch (wValue) {
case USB_PORT_FEAT_C_OVER_CURRENT:
dev_dbg(hcd->self.controller,
"ClearPortFeature: C_OVER_CURRENT\n");
if (valid_port(wIndex)) {
pdata->overcurrent_changed[wIndex] = 0;
pdata->overcurrent_status[wIndex] = 0;
}
goto out;
case USB_PORT_FEAT_OVER_CURRENT:
dev_dbg(hcd->self.controller,
"ClearPortFeature: OVER_CURRENT\n");
if (valid_port(wIndex))
pdata->overcurrent_status[wIndex] = 0;
goto out;
case USB_PORT_FEAT_POWER:
dev_dbg(hcd->self.controller,
"ClearPortFeature: POWER\n");
if (valid_port(wIndex)) {
ohci_at91_usb_set_power(pdata, wIndex, 0);
return 0;
}
break;
case USB_PORT_FEAT_SUSPEND:
dev_dbg(hcd->self.controller, "ClearPortFeature: SUSPEND\n");
if (valid_port(wIndex)) {
ohci_at91_port_suspend(ohci_at91, 0);
return 0;
}
break;
}
break;
}
ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
if (ret)
goto out;
switch (typeReq) {
case GetHubDescriptor:
/* update the hub's descriptor */
desc = (struct usb_hub_descriptor *)buf;
dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
desc->wHubCharacteristics);
/* remove the old configurations for power-switching, and
* over-current protection, and insert our new configuration
*/
desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
desc->wHubCharacteristics |=
cpu_to_le16(HUB_CHAR_INDV_PORT_LPSM);
if (pdata->overcurrent_supported) {
desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
desc->wHubCharacteristics |=
cpu_to_le16(HUB_CHAR_INDV_PORT_OCPM);
}
dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
desc->wHubCharacteristics);
return ret;
case GetPortStatus:
/* check port status */
dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
if (valid_port(wIndex)) {
if (!ohci_at91_usb_get_power(pdata, wIndex))
*data &= ~cpu_to_le32(RH_PS_PPS);
if (pdata->overcurrent_changed[wIndex])
*data |= cpu_to_le32(RH_PS_OCIC);
if (pdata->overcurrent_status[wIndex])
*data |= cpu_to_le32(RH_PS_POCI);
}
}
out:
return ret;
}
/*-------------------------------------------------------------------------*/
static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
{
struct platform_device *pdev = data;
struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
int val, port;
/* From the GPIO notifying the over-current situation, find
* out the corresponding port */
at91_for_each_port(port) {
if (gpiod_to_irq(pdata->overcurrent_pin[port]) == irq)
break;
}
if (port == AT91_MAX_USBH_PORTS) {
dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
return IRQ_HANDLED;
}
val = gpiod_get_value(pdata->overcurrent_pin[port]);
/* When notified of an over-current situation, disable power
on the corresponding port, and mark this port in
over-current. */
if (!val) {
ohci_at91_usb_set_power(pdata, port, 0);
pdata->overcurrent_status[port] = 1;
pdata->overcurrent_changed[port] = 1;
}
dev_dbg(& pdev->dev, "overcurrent situation %s\n",
val ? "exited" : "notified");
return IRQ_HANDLED;
}
static const struct of_device_id at91_ohci_dt_ids[] = {
{ .compatible = "atmel,at91rm9200-ohci" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
/*-------------------------------------------------------------------------*/
static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct at91_usbh_data *pdata;
int i;
int ret;
int err;
u32 ports;
/* Right now device-tree probed devices don't get dma_mask set.
* Since shared usb code relies on it, set it here for now.
* Once we have dma capability bindings this can go away.
*/
ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (ret)
return ret;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdev->dev.platform_data = pdata;
if (!of_property_read_u32(np, "num-ports", &ports))
pdata->ports = ports;
at91_for_each_port(i) {
if (i >= pdata->ports)
break;
pdata->vbus_pin[i] =
devm_gpiod_get_index_optional(&pdev->dev, "atmel,vbus",
i, GPIOD_OUT_HIGH);
if (IS_ERR(pdata->vbus_pin[i])) {
err = PTR_ERR(pdata->vbus_pin[i]);
dev_err(&pdev->dev, "unable to claim gpio \"vbus\": %d\n", err);
continue;
}
}
at91_for_each_port(i) {
if (i >= pdata->ports)
break;
pdata->overcurrent_pin[i] =
devm_gpiod_get_index_optional(&pdev->dev, "atmel,oc",
i, GPIOD_IN);
if (!pdata->overcurrent_pin[i])
continue;
if (IS_ERR(pdata->overcurrent_pin[i])) {
err = PTR_ERR(pdata->overcurrent_pin[i]);
dev_err(&pdev->dev, "unable to claim gpio \"overcurrent\": %d\n", err);
continue;
}
ret = devm_request_irq(&pdev->dev,
gpiod_to_irq(pdata->overcurrent_pin[i]),
ohci_hcd_at91_overcurrent_irq,
IRQF_SHARED,
"ohci_overcurrent", pdev);
if (ret)
dev_info(&pdev->dev, "failed to request gpio \"overcurrent\" IRQ\n");
}
device_init_wakeup(&pdev->dev, 1);
return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
}
static void ohci_hcd_at91_drv_remove(struct platform_device *pdev)
{
struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
int i;
if (pdata) {
at91_for_each_port(i)
ohci_at91_usb_set_power(pdata, i, 0);
}
device_init_wakeup(&pdev->dev, 0);
usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
}
static int __maybe_unused
ohci_hcd_at91_drv_suspend(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
int ret;
/*
* Disable wakeup if we are going to sleep with slow clock mode
* enabled.
*/
ohci_at91->wakeup = device_may_wakeup(dev)
&& !at91_suspend_entering_slow_clock();
if (ohci_at91->wakeup)
enable_irq_wake(hcd->irq);
ret = ohci_suspend(hcd, ohci_at91->wakeup);
if (ret) {
if (ohci_at91->wakeup)
disable_irq_wake(hcd->irq);
return ret;
}
/*
* The integrated transceivers seem unable to notice disconnect,
* reconnect, or wakeup without the 48 MHz clock active. so for
* correctness, always discard connection state (using reset).
*
* REVISIT: some boards will be able to turn VBUS off...
*/
if (!ohci_at91->wakeup) {
ohci->rh_state = OHCI_RH_HALTED;
/* flush the writes */
(void) ohci_readl (ohci, &ohci->regs->control);
msleep(1);
ohci_at91_port_suspend(ohci_at91, 1);
at91_stop_clock(ohci_at91);
} else {
ohci_at91_port_suspend(ohci_at91, 1);
}
return ret;
}
static int __maybe_unused
ohci_hcd_at91_drv_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
ohci_at91_port_suspend(ohci_at91, 0);
if (ohci_at91->wakeup)
disable_irq_wake(hcd->irq);
else
at91_start_clock(ohci_at91);
/*
* According to the comment in ohci_hcd_at91_drv_suspend()
* we need to do a reset if the 48Mhz clock was stopped,
* that is, if ohci_at91->wakeup is clear. Tell ohci_resume()
* to reset in this case by setting its "hibernated" flag.
*/
ohci_resume(hcd, !ohci_at91->wakeup);
return 0;
}
static SIMPLE_DEV_PM_OPS(ohci_hcd_at91_pm_ops, ohci_hcd_at91_drv_suspend,
ohci_hcd_at91_drv_resume);
static struct platform_driver ohci_hcd_at91_driver = {
.probe = ohci_hcd_at91_drv_probe,
.remove_new = ohci_hcd_at91_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = "at91_ohci",
.pm = &ohci_hcd_at91_pm_ops,
.of_match_table = at91_ohci_dt_ids,
},
};
static int __init ohci_at91_init(void)
{
if (usb_disabled())
return -ENODEV;
ohci_init_driver(&ohci_at91_hc_driver, &ohci_at91_drv_overrides);
/*
* The Atmel HW has some unusual quirks, which require Atmel-specific
* workarounds. We override certain hc_driver functions here to
* achieve that. We explicitly do not enhance ohci_driver_overrides to
* allow this more easily, since this is an unusual case, and we don't
* want to encourage others to override these functions by making it
* too easy.
*/
ohci_at91_hc_driver.hub_status_data = ohci_at91_hub_status_data;
ohci_at91_hc_driver.hub_control = ohci_at91_hub_control;
return platform_driver_register(&ohci_hcd_at91_driver);
}
module_init(ohci_at91_init);
static void __exit ohci_at91_cleanup(void)
{
platform_driver_unregister(&ohci_hcd_at91_driver);
}
module_exit(ohci_at91_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:at91_ohci");
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