mirror of
https://github.com/torvalds/linux.git
synced 2024-12-11 05:33:09 +00:00
a930d8bd94
Commit03e6275ae3("usb: chipidea: Fix ULPI on imx51") causes a kernel hang on imx51 systems that use the ULPI interface and do not select the CONFIG_USB_CHIPIDEA_ULPI option. In order to avoid such potential misuse, let's always build the chipidea ULPI code into the final ci_hdrc object. Tested on a imx51-babbage board. Fixes:03e6275ae3("usb: chipidea: Fix ULPI on imx51") Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by: Peter Chen <peter.chen@nxp.com>
109 lines
2.2 KiB
C
109 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2016 Linaro Ltd.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/usb/chipidea.h>
|
|
#include <linux/ulpi/interface.h>
|
|
|
|
#include "ci.h"
|
|
|
|
#define ULPI_WAKEUP BIT(31)
|
|
#define ULPI_RUN BIT(30)
|
|
#define ULPI_WRITE BIT(29)
|
|
#define ULPI_SYNC_STATE BIT(27)
|
|
#define ULPI_ADDR(n) ((n) << 16)
|
|
#define ULPI_DATA(n) (n)
|
|
|
|
static int ci_ulpi_wait(struct ci_hdrc *ci, u32 mask)
|
|
{
|
|
unsigned long usec = 10000;
|
|
|
|
while (usec--) {
|
|
if (!hw_read(ci, OP_ULPI_VIEWPORT, mask))
|
|
return 0;
|
|
|
|
udelay(1);
|
|
}
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
static int ci_ulpi_read(struct device *dev, u8 addr)
|
|
{
|
|
struct ci_hdrc *ci = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
hw_write(ci, OP_ULPI_VIEWPORT, 0xffffffff, ULPI_WRITE | ULPI_WAKEUP);
|
|
ret = ci_ulpi_wait(ci, ULPI_WAKEUP);
|
|
if (ret)
|
|
return ret;
|
|
|
|
hw_write(ci, OP_ULPI_VIEWPORT, 0xffffffff, ULPI_RUN | ULPI_ADDR(addr));
|
|
ret = ci_ulpi_wait(ci, ULPI_RUN);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return hw_read(ci, OP_ULPI_VIEWPORT, GENMASK(15, 8)) >> 8;
|
|
}
|
|
|
|
static int ci_ulpi_write(struct device *dev, u8 addr, u8 val)
|
|
{
|
|
struct ci_hdrc *ci = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
hw_write(ci, OP_ULPI_VIEWPORT, 0xffffffff, ULPI_WRITE | ULPI_WAKEUP);
|
|
ret = ci_ulpi_wait(ci, ULPI_WAKEUP);
|
|
if (ret)
|
|
return ret;
|
|
|
|
hw_write(ci, OP_ULPI_VIEWPORT, 0xffffffff,
|
|
ULPI_RUN | ULPI_WRITE | ULPI_ADDR(addr) | val);
|
|
return ci_ulpi_wait(ci, ULPI_RUN);
|
|
}
|
|
|
|
int ci_ulpi_init(struct ci_hdrc *ci)
|
|
{
|
|
if (ci->platdata->phy_mode != USBPHY_INTERFACE_MODE_ULPI)
|
|
return 0;
|
|
|
|
/*
|
|
* Set PORTSC correctly so we can read/write ULPI registers for
|
|
* identification purposes
|
|
*/
|
|
hw_phymode_configure(ci);
|
|
|
|
ci->ulpi_ops.read = ci_ulpi_read;
|
|
ci->ulpi_ops.write = ci_ulpi_write;
|
|
ci->ulpi = ulpi_register_interface(ci->dev, &ci->ulpi_ops);
|
|
if (IS_ERR(ci->ulpi))
|
|
dev_err(ci->dev, "failed to register ULPI interface");
|
|
|
|
return PTR_ERR_OR_ZERO(ci->ulpi);
|
|
}
|
|
|
|
void ci_ulpi_exit(struct ci_hdrc *ci)
|
|
{
|
|
if (ci->ulpi) {
|
|
ulpi_unregister_interface(ci->ulpi);
|
|
ci->ulpi = NULL;
|
|
}
|
|
}
|
|
|
|
int ci_ulpi_resume(struct ci_hdrc *ci)
|
|
{
|
|
int cnt = 100000;
|
|
|
|
if (ci->platdata->phy_mode != USBPHY_INTERFACE_MODE_ULPI)
|
|
return 0;
|
|
|
|
while (cnt-- > 0) {
|
|
if (hw_read(ci, OP_ULPI_VIEWPORT, ULPI_SYNC_STATE))
|
|
return 0;
|
|
udelay(1);
|
|
}
|
|
|
|
return -ETIMEDOUT;
|
|
}
|