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51b751f112
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: Thierry Reding <thierry.reding@gmail.com> Cc: Jonathan Hunter <jonathanh@nvidia.com> Acked-by: Peter Chen <peter.chen@nxp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
106 lines
2.1 KiB
C
106 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2016 Linaro Ltd.
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*/
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#include <linux/device.h>
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#include <linux/usb/chipidea.h>
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#include <linux/ulpi/interface.h>
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#include "ci.h"
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#define ULPI_WAKEUP BIT(31)
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#define ULPI_RUN BIT(30)
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#define ULPI_WRITE BIT(29)
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#define ULPI_SYNC_STATE BIT(27)
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#define ULPI_ADDR(n) ((n) << 16)
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#define ULPI_DATA(n) (n)
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static int ci_ulpi_wait(struct ci_hdrc *ci, u32 mask)
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{
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unsigned long usec = 10000;
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while (usec--) {
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if (!hw_read(ci, OP_ULPI_VIEWPORT, mask))
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return 0;
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udelay(1);
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}
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return -ETIMEDOUT;
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}
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static int ci_ulpi_read(struct device *dev, u8 addr)
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{
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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int ret;
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hw_write(ci, OP_ULPI_VIEWPORT, 0xffffffff, ULPI_WRITE | ULPI_WAKEUP);
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ret = ci_ulpi_wait(ci, ULPI_WAKEUP);
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if (ret)
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return ret;
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hw_write(ci, OP_ULPI_VIEWPORT, 0xffffffff, ULPI_RUN | ULPI_ADDR(addr));
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ret = ci_ulpi_wait(ci, ULPI_RUN);
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if (ret)
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return ret;
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return hw_read(ci, OP_ULPI_VIEWPORT, GENMASK(15, 8)) >> 8;
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}
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static int ci_ulpi_write(struct device *dev, u8 addr, u8 val)
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{
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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int ret;
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hw_write(ci, OP_ULPI_VIEWPORT, 0xffffffff, ULPI_WRITE | ULPI_WAKEUP);
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ret = ci_ulpi_wait(ci, ULPI_WAKEUP);
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if (ret)
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return ret;
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hw_write(ci, OP_ULPI_VIEWPORT, 0xffffffff,
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ULPI_RUN | ULPI_WRITE | ULPI_ADDR(addr) | val);
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return ci_ulpi_wait(ci, ULPI_RUN);
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}
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int ci_ulpi_init(struct ci_hdrc *ci)
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{
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if (ci->platdata->phy_mode != USBPHY_INTERFACE_MODE_ULPI)
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return 0;
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/*
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* Set PORTSC correctly so we can read/write ULPI registers for
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* identification purposes
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*/
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hw_phymode_configure(ci);
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ci->ulpi_ops.read = ci_ulpi_read;
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ci->ulpi_ops.write = ci_ulpi_write;
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ci->ulpi = ulpi_register_interface(ci->dev, &ci->ulpi_ops);
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if (IS_ERR(ci->ulpi))
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dev_err(ci->dev, "failed to register ULPI interface");
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return PTR_ERR_OR_ZERO(ci->ulpi);
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}
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void ci_ulpi_exit(struct ci_hdrc *ci)
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{
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if (ci->ulpi) {
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ulpi_unregister_interface(ci->ulpi);
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ci->ulpi = NULL;
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}
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}
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int ci_ulpi_resume(struct ci_hdrc *ci)
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{
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int cnt = 100000;
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while (cnt-- > 0) {
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if (hw_read(ci, OP_ULPI_VIEWPORT, ULPI_SYNC_STATE))
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return 0;
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udelay(1);
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}
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return -ETIMEDOUT;
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}
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