You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
2.0 KiB
91 lines
2.0 KiB
/** |
|
* 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 ulpi_ops *ops, u8 addr) |
|
{ |
|
struct dwc3 *dwc = dev_get_drvdata(ops->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 ulpi_ops *ops, u8 addr, u8 val) |
|
{ |
|
struct dwc3 *dwc = dev_get_drvdata(ops->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 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; |
|
} |
|
}
|
|
|