diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/usb/dwc3/ulpi.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/usb/dwc3/ulpi.c')
-rw-r--r-- | drivers/usb/dwc3/ulpi.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/ulpi.c b/drivers/usb/dwc3/ulpi.c new file mode 100644 index 000000000..f23f4c9a5 --- /dev/null +++ b/drivers/usb/dwc3/ulpi.c @@ -0,0 +1,104 @@ +// 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; + } +} |