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104 lines
2.3 KiB
104 lines
2.3 KiB
// 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 <[email protected]> |
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*/ |
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#include <linux/delay.h> |
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#include <linux/time64.h> |
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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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#define DWC3_ULPI_BASE_DELAY DIV_ROUND_UP(NSEC_PER_SEC, 60000000L) |
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static int dwc3_ulpi_busyloop(struct dwc3 *dwc, u8 addr, bool read) |
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{ |
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unsigned long ns = 5L * DWC3_ULPI_BASE_DELAY; |
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unsigned int count = 10000; |
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u32 reg; |
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if (addr >= ULPI_EXT_VENDOR_SPECIFIC) |
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ns += DWC3_ULPI_BASE_DELAY; |
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if (read) |
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ns += DWC3_ULPI_BASE_DELAY; |
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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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usleep_range(1000, 1200); |
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while (count--) { |
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ndelay(ns); |
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reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYACC(0)); |
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if (reg & DWC3_GUSB2PHYACC_DONE) |
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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_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, addr, true); |
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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_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, addr, false); |
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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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