073c47aca7
ulpi_register_interface() accepts a const struct ulpi_ops and dwc3 doesn't perform any changes to this struct at runtime, so there's no reason it shouldn't be constant. Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Tal Shorer <tal.shorer@gmail.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
92 lines
2 KiB
C
92 lines
2 KiB
C
/**
|
|
* ulpi.c - DesignWare USB3 Controller's ULPI PHY interface
|
|
*
|
|
* Copyright (C) 2015 Intel Corporation
|
|
*
|
|
* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/ulpi/regs.h>
|
|
|
|
#include "core.h"
|
|
#include "io.h"
|
|
|
|
#define DWC3_ULPI_ADDR(a) \
|
|
((a >= ULPI_EXT_VENDOR_SPECIFIC) ? \
|
|
DWC3_GUSB2PHYACC_ADDR(ULPI_ACCESS_EXTENDED) | \
|
|
DWC3_GUSB2PHYACC_EXTEND_ADDR(a) : DWC3_GUSB2PHYACC_ADDR(a))
|
|
|
|
static int dwc3_ulpi_busyloop(struct dwc3 *dwc)
|
|
{
|
|
unsigned count = 1000;
|
|
u32 reg;
|
|
|
|
while (count--) {
|
|
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYACC(0));
|
|
if (!(reg & DWC3_GUSB2PHYACC_BUSY))
|
|
return 0;
|
|
cpu_relax();
|
|
}
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
static int dwc3_ulpi_read(struct device *dev, u8 addr)
|
|
{
|
|
struct dwc3 *dwc = dev_get_drvdata(dev);
|
|
u32 reg;
|
|
int ret;
|
|
|
|
reg = DWC3_GUSB2PHYACC_NEWREGREQ | DWC3_ULPI_ADDR(addr);
|
|
dwc3_writel(dwc->regs, DWC3_GUSB2PHYACC(0), reg);
|
|
|
|
ret = dwc3_ulpi_busyloop(dwc);
|
|
if (ret)
|
|
return ret;
|
|
|
|
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYACC(0));
|
|
|
|
return DWC3_GUSB2PHYACC_DATA(reg);
|
|
}
|
|
|
|
static int dwc3_ulpi_write(struct device *dev, u8 addr, u8 val)
|
|
{
|
|
struct dwc3 *dwc = dev_get_drvdata(dev);
|
|
u32 reg;
|
|
|
|
reg = DWC3_GUSB2PHYACC_NEWREGREQ | DWC3_ULPI_ADDR(addr);
|
|
reg |= DWC3_GUSB2PHYACC_WRITE | val;
|
|
dwc3_writel(dwc->regs, DWC3_GUSB2PHYACC(0), reg);
|
|
|
|
return dwc3_ulpi_busyloop(dwc);
|
|
}
|
|
|
|
static const struct ulpi_ops dwc3_ulpi_ops = {
|
|
.read = dwc3_ulpi_read,
|
|
.write = dwc3_ulpi_write,
|
|
};
|
|
|
|
int dwc3_ulpi_init(struct dwc3 *dwc)
|
|
{
|
|
/* Register the interface */
|
|
dwc->ulpi = ulpi_register_interface(dwc->dev, &dwc3_ulpi_ops);
|
|
if (IS_ERR(dwc->ulpi)) {
|
|
dev_err(dwc->dev, "failed to register ULPI interface");
|
|
return PTR_ERR(dwc->ulpi);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void dwc3_ulpi_exit(struct dwc3 *dwc)
|
|
{
|
|
if (dwc->ulpi) {
|
|
ulpi_unregister_interface(dwc->ulpi);
|
|
dwc->ulpi = NULL;
|
|
}
|
|
}
|