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b5ea47570b
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Kukjin Kim <kgene@kernel.org> Cc: Krzysztof Kozlowski <krzk@kernel.org> Cc: Patrice Chotard <patrice.chotard@st.com> Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/**
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* ulpi.c - DesignWare USB3 Controller's ULPI PHY interface
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*
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* Copyright (C) 2015 Intel Corporation
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*
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* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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*/
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#include <linux/ulpi/regs.h>
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#include "core.h"
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#include "io.h"
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#define DWC3_ULPI_ADDR(a) \
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((a >= ULPI_EXT_VENDOR_SPECIFIC) ? \
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DWC3_GUSB2PHYACC_ADDR(ULPI_ACCESS_EXTENDED) | \
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DWC3_GUSB2PHYACC_EXTEND_ADDR(a) : DWC3_GUSB2PHYACC_ADDR(a))
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static int dwc3_ulpi_busyloop(struct dwc3 *dwc)
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{
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unsigned count = 1000;
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u32 reg;
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while (count--) {
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reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYACC(0));
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if (!(reg & DWC3_GUSB2PHYACC_BUSY))
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return 0;
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cpu_relax();
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}
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return -ETIMEDOUT;
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}
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static int dwc3_ulpi_read(struct device *dev, u8 addr)
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{
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struct dwc3 *dwc = dev_get_drvdata(dev);
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u32 reg;
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int ret;
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reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
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if (reg & DWC3_GUSB2PHYCFG_SUSPHY) {
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reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
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dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
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}
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reg = DWC3_GUSB2PHYACC_NEWREGREQ | DWC3_ULPI_ADDR(addr);
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dwc3_writel(dwc->regs, DWC3_GUSB2PHYACC(0), reg);
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ret = dwc3_ulpi_busyloop(dwc);
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if (ret)
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return ret;
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reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYACC(0));
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return DWC3_GUSB2PHYACC_DATA(reg);
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}
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static int dwc3_ulpi_write(struct device *dev, u8 addr, u8 val)
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{
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struct dwc3 *dwc = dev_get_drvdata(dev);
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u32 reg;
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reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
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if (reg & DWC3_GUSB2PHYCFG_SUSPHY) {
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reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
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dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
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}
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reg = DWC3_GUSB2PHYACC_NEWREGREQ | DWC3_ULPI_ADDR(addr);
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reg |= DWC3_GUSB2PHYACC_WRITE | val;
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dwc3_writel(dwc->regs, DWC3_GUSB2PHYACC(0), reg);
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return dwc3_ulpi_busyloop(dwc);
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}
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static const struct ulpi_ops dwc3_ulpi_ops = {
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.read = dwc3_ulpi_read,
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.write = dwc3_ulpi_write,
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};
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int dwc3_ulpi_init(struct dwc3 *dwc)
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{
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/* Register the interface */
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dwc->ulpi = ulpi_register_interface(dwc->dev, &dwc3_ulpi_ops);
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if (IS_ERR(dwc->ulpi)) {
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dev_err(dwc->dev, "failed to register ULPI interface");
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return PTR_ERR(dwc->ulpi);
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}
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return 0;
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}
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void dwc3_ulpi_exit(struct dwc3 *dwc)
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{
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if (dwc->ulpi) {
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ulpi_unregister_interface(dwc->ulpi);
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dwc->ulpi = NULL;
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}
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}
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