// SPDX-License-Identifier: GPL-1.0+
/*
* OHCI HCD (Host Controller Driver) for USB.
*
* (C) Copyright 1999 Roman Weissgaerber <[email protected]>
* (C) Copyright 2000-2005 David Brownell
* (C) Copyright 2002 Hewlett-Packard Company
*
* OMAP Bus Glue
*
* Modified for OMAP by Tony Lindgren <[email protected]>
* Based on the 2.4 OMAP OHCI driver originally done by MontaVista Software Inc.
* and on ohci-sa1111.c by Christopher Hoover <[email protected]>
*
* This file is licenced under the GPL.
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb/otg.h>
#include <linux/platform_device.h>
#include <linux/platform_data/usb-omap1.h>
#include <linux/soc/ti/omap1-usb.h>
#include <linux/soc/ti/omap1-mux.h>
#include <linux/soc/ti/omap1-soc.h>
#include <linux/soc/ti/omap1-io.h>
#include <linux/signal.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "ohci.h"
#include <asm/io.h>
#include <asm/mach-types.h>
#define DRIVER_DESC "OHCI OMAP driver"
struct ohci_omap_priv {
struct clk *usb_host_ck;
struct clk *usb_dc_ck;
struct gpio_desc *power;
struct gpio_desc *overcurrent;
};
static const char hcd_name[] = "ohci-omap";
static struct hc_driver __read_mostly ohci_omap_hc_driver;
#define hcd_to_ohci_omap_priv(h) \
((struct ohci_omap_priv *)hcd_to_ohci(h)->priv)
static void omap_ohci_clock_power(struct ohci_omap_priv *priv, int on)
{
if (on) {
clk_enable(priv->usb_dc_ck);
clk_enable(priv->usb_host_ck);
/* guesstimate for T5 == 1x 32K clock + APLL lock time */
udelay(100);
} else {
clk_disable(priv->usb_host_ck);
clk_disable(priv->usb_dc_ck);
}
}
static void start_hnp(struct ohci_hcd *ohci)
{
struct usb_hcd *hcd = ohci_to_hcd(ohci);
const unsigned port = hcd->self.otg_port - 1;
unsigned long flags;
u32 l;
otg_start_hnp(hcd->usb_phy->otg);
local_irq_save(flags);
hcd->usb_phy->otg->state = OTG_STATE_A_SUSPEND;
writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
l = omap_readl(OTG_CTRL);
l &= ~OTG_A_BUSREQ;
omap_writel(l, OTG_CTRL);
local_irq_restore(flags);
}
/*-------------------------------------------------------------------------*/
static int ohci_omap_reset(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
struct omap_usb_config *config = dev_get_platdata(hcd->self.controller);
struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
int need_transceiver = (config->otg != 0);
int ret;
dev_dbg(hcd->self.controller, "starting USB Controller\n");
if (config->otg) {
hcd->self.otg_port = config->otg;
/* default/minimum OTG power budget: 8 mA */
hcd->power_budget = 8;
}
/* XXX OMAP16xx only */
if (config->ocpi_enable)
config->ocpi_enable();
if (IS_ENABLED(CONFIG_USB_OTG) && need_transceiver) {
hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
int status = otg_set_host(hcd->usb_phy->otg,
&ohci_to_hcd(ohci)->self);
dev_dbg(hcd->self.controller, "init %s phy, status %d\n",
hcd->usb_phy->label, status);
if (status) {
usb_put_phy(hcd->usb_phy);
return status;
}
} else {
return -EPROBE_DEFER;
}
hcd->skip_phy_initialization = 1;
ohci->start_hnp = start_hnp;
}
omap_ohci_clock_power(priv, 1);
if (config->lb_reset)
config->lb_reset();
ret = ohci_setup(hcd);
if (ret < 0)
return ret;
if (config->otg || config->rwc) {
ohci->hc_control = OHCI_CTRL_RWC;
writel(OHCI_CTRL_RWC, &ohci->regs->control);
}
/* board-specific power switching and overcurrent support */
if (machine_is_omap_osk()) {
u32 rh = roothub_a (ohci);
/* power switching (ganged by default) */
rh &= ~RH_A_NPS;
/* TPS2045 switch for internal transceiver (port 1) */
if (machine_is_omap_osk()) {
ohci_to_hcd(ohci)->power_budget = 250;
rh &= ~RH_A_NOCP;
/* gpio9 for overcurrent detction */
omap_cfg_reg(W8_1610_GPIO9);
/* for paranoia's sake: disable USB.PUEN */
omap_cfg_reg(W4_USB_HIGHZ);
}
ohci_writel(ohci, rh, &ohci->regs->roothub.a);
ohci->flags &= ~OHCI_QUIRK_HUB_POWER;
} else if (machine_is_nokia770()) {
/* We require a self-powered hub, which should have
* plenty of power. */
ohci_to_hcd(ohci)->power_budget = 0;
}
/* FIXME hub_wq hub requests should manage power switching */
if (config->transceiver_power)
return config->transceiver_power(1);
if (priv->power)
gpiod_set_value_cansleep(priv->power, 0);
/* board init will have already handled HMC and mux setup.
* any external transceiver should already be initialized
* too, so all configured ports use the right signaling now.
*/
return 0;
}
/*-------------------------------------------------------------------------*/
/**
* ohci_hcd_omap_probe - initialize OMAP-based HCDs
* @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 ohci_hcd_omap_probe(struct platform_device *pdev)
{
int retval, irq;
struct usb_hcd *hcd = 0;
struct ohci_omap_priv *priv;
if (pdev->num_resources != 2) {
dev_err(&pdev->dev, "invalid num_resources: %i\n",
pdev->num_resources);
return -ENODEV;
}
if (pdev->resource[0].flags != IORESOURCE_MEM
|| pdev->resource[1].flags != IORESOURCE_IRQ) {
dev_err(&pdev->dev, "invalid resource type\n");
return -ENODEV;
}
hcd = usb_create_hcd(&ohci_omap_hc_driver, &pdev->dev,
dev_name(&pdev->dev));
if (!hcd)
return -ENOMEM;
hcd->rsrc_start = pdev->resource[0].start;
hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
priv = hcd_to_ohci_omap_priv(hcd);
/* Obtain two optional GPIO lines */
priv->power = devm_gpiod_get_optional(&pdev->dev, "power", GPIOD_ASIS);
if (IS_ERR(priv->power)) {
retval = PTR_ERR(priv->power);
goto err_put_hcd;
}
if (priv->power)
gpiod_set_consumer_name(priv->power, "OHCI power");
/*
* This "overcurrent" GPIO line isn't really used in the code,
* but has a designated hardware function.
* TODO: implement proper overcurrent handling.
*/
priv->overcurrent = devm_gpiod_get_optional(&pdev->dev, "overcurrent",
GPIOD_IN);
if (IS_ERR(priv->overcurrent)) {
retval = PTR_ERR(priv->overcurrent);
goto err_put_hcd;
}
if (priv->overcurrent)
gpiod_set_consumer_name(priv->overcurrent, "OHCI overcurrent");
priv->usb_host_ck = clk_get(&pdev->dev, "usb_hhc_ck");
if (IS_ERR(priv->usb_host_ck)) {
retval = PTR_ERR(priv->usb_host_ck);
goto err_put_hcd;
}
retval = clk_prepare(priv->usb_host_ck);
if (retval)
goto err_put_host_ck;
if (!cpu_is_omap15xx())
priv->usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck");
else
priv->usb_dc_ck = clk_get(&pdev->dev, "lb_ck");
if (IS_ERR(priv->usb_dc_ck)) {
retval = PTR_ERR(priv->usb_dc_ck);
goto err_unprepare_host_ck;
}
retval = clk_prepare(priv->usb_dc_ck);
if (retval)
goto err_put_dc_ck;
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
dev_dbg(&pdev->dev, "request_mem_region failed\n");
retval = -EBUSY;
goto err_unprepare_dc_ck;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
dev_err(&pdev->dev, "can't ioremap OHCI HCD\n");
retval = -ENOMEM;
goto err2;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
retval = irq;
goto err3;
}
retval = usb_add_hcd(hcd, irq, 0);
if (retval)
goto err3;
device_wakeup_enable(hcd->self.controller);
return 0;
err3:
iounmap(hcd->regs);
err2:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err_unprepare_dc_ck:
clk_unprepare(priv->usb_dc_ck);
err_put_dc_ck:
clk_put(priv->usb_dc_ck);
err_unprepare_host_ck:
clk_unprepare(priv->usb_host_ck);
err_put_host_ck:
clk_put(priv->usb_host_ck);
err_put_hcd:
usb_put_hcd(hcd);
return retval;
}
/* may be called with controller, bus, and devices active */
/**
* ohci_hcd_omap_remove - shutdown processing for OMAP-based HCDs
* @pdev: USB Host Controller being removed
*
* Context: task context, might sleep
*
* Reverses the effect of ohci_hcd_omap_probe(), first invoking
* the HCD's stop() method. It is always called from a thread
* context, normally "rmmod", "apmd", or something similar.
*/
static void ohci_hcd_omap_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
dev_dbg(hcd->self.controller, "stopping USB Controller\n");
usb_remove_hcd(hcd);
omap_ohci_clock_power(priv, 0);
if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
(void) otg_set_host(hcd->usb_phy->otg, 0);
usb_put_phy(hcd->usb_phy);
}
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
clk_unprepare(priv->usb_dc_ck);
clk_put(priv->usb_dc_ck);
clk_unprepare(priv->usb_host_ck);
clk_put(priv->usb_host_ck);
usb_put_hcd(hcd);
}
/*-------------------------------------------------------------------------*/
#ifdef CONFIG_PM
static int ohci_omap_suspend(struct platform_device *pdev, pm_message_t message)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
bool do_wakeup = device_may_wakeup(&pdev->dev);
int ret;
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
ret = ohci_suspend(hcd, do_wakeup);
if (ret)
return ret;
omap_ohci_clock_power(priv, 0);
return ret;
}
static int ohci_omap_resume(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
omap_ohci_clock_power(priv, 1);
ohci_resume(hcd, false);
return 0;
}
#endif
/*-------------------------------------------------------------------------*/
/*
* Driver definition to register with the OMAP bus
*/
static struct platform_driver ohci_hcd_omap_driver = {
.probe = ohci_hcd_omap_probe,
.remove_new = ohci_hcd_omap_remove,
.shutdown = usb_hcd_platform_shutdown,
#ifdef CONFIG_PM
.suspend = ohci_omap_suspend,
.resume = ohci_omap_resume,
#endif
.driver = {
.name = "ohci",
},
};
static const struct ohci_driver_overrides omap_overrides __initconst = {
.product_desc = "OMAP OHCI",
.reset = ohci_omap_reset,
.extra_priv_size = sizeof(struct ohci_omap_priv),
};
static int __init ohci_omap_init(void)
{
if (usb_disabled())
return -ENODEV;
ohci_init_driver(&ohci_omap_hc_driver, &omap_overrides);
return platform_driver_register(&ohci_hcd_omap_driver);
}
module_init(ohci_omap_init);
static void __exit ohci_omap_cleanup(void)
{
platform_driver_unregister(&ohci_hcd_omap_driver);
}
module_exit(ohci_omap_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:ohci");
MODULE_LICENSE("GPL");
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