// SPDX-License-Identifier: GPL-2.0
|
/*
|
* ulpi.c - DesignWare USB3 Controller's ULPI PHY interface
|
*
|
* Copyright (C) 2015 Intel Corporation
|
*
|
* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
|
*/
|
|
#include <linux/delay.h>
|
#include <linux/time64.h>
|
#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))
|
|
#define DWC3_ULPI_BASE_DELAY DIV_ROUND_UP(NSEC_PER_SEC, 60000000L)
|
|
static int dwc3_ulpi_busyloop(struct dwc3 *dwc, u8 addr, bool read)
|
{
|
unsigned long ns = 5L * DWC3_ULPI_BASE_DELAY;
|
unsigned int count = 10000;
|
u32 reg;
|
|
if (addr >= ULPI_EXT_VENDOR_SPECIFIC)
|
ns += DWC3_ULPI_BASE_DELAY;
|
|
if (read)
|
ns += DWC3_ULPI_BASE_DELAY;
|
|
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
|
if (reg & DWC3_GUSB2PHYCFG_SUSPHY)
|
usleep_range(1000, 1200);
|
|
while (count--) {
|
ndelay(ns);
|
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYACC(0));
|
if (reg & DWC3_GUSB2PHYACC_DONE)
|
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, addr, true);
|
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, addr, false);
|
}
|
|
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;
|
}
|
}
|
