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154 lines
3.9 KiB
154 lines
3.9 KiB
/*
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* Copyright (c) 2014-2017, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/delay.h>
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#include <linux/usb/phy.h>
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/* QSCRATCH registers */
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#define HS_PHY_CTRL_REG 0x10
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#define SW_SESSVLD_SEL BIT(28)
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struct qcusb_emu_phy {
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struct usb_phy phy;
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struct device *dev;
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void __iomem *base;
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void __iomem *qscratch_base;
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int *emu_init_seq;
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int emu_init_seq_len;
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};
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static int qcusb_emu_phy_init(struct usb_phy *phy)
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{
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struct qcusb_emu_phy *qphy = container_of(phy,
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struct qcusb_emu_phy, phy);
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u32 tmp;
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int i;
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for (i = 0; i < qphy->emu_init_seq_len; i = i+2) {
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dev_dbg(phy->dev, "write 0x%02x to 0x%02x\n",
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qphy->emu_init_seq[i], qphy->emu_init_seq[i+1]);
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writel_relaxed(qphy->emu_init_seq[i],
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qphy->base + qphy->emu_init_seq[i+1]);
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/* 10ms to ensure write propagates across bus */
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usleep_range(10000, 12000);
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}
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if (qphy->qscratch_base) {
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/* Use UTMI VBUS signal from HW */
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tmp = readl_relaxed(qphy->qscratch_base + HS_PHY_CTRL_REG);
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tmp &= ~SW_SESSVLD_SEL;
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writel_relaxed(tmp, qphy->qscratch_base + HS_PHY_CTRL_REG);
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}
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return 0;
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}
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static int qcusb_emu_phy_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct qcusb_emu_phy *qphy;
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struct resource *res;
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int ret, size;
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qphy = devm_kzalloc(dev, sizeof(*qphy), GFP_KERNEL);
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if (!qphy)
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return -ENOMEM;
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qphy->phy.dev = dev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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qphy->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(qphy->base))
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return PTR_ERR(qphy->base);
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of_get_property(dev->of_node, "qcom,emu-init-seq", &size);
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if (!size) {
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dev_err(dev, "emu-init-seq not specified\n");
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return -EINVAL;
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}
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qphy->emu_init_seq = devm_kzalloc(dev, size, GFP_KERNEL);
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if (!qphy->emu_init_seq)
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return -ENOMEM;
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qphy->emu_init_seq_len = (size / sizeof(*qphy->emu_init_seq));
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if (qphy->emu_init_seq_len % 2) {
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dev_err(dev, "invalid emu_init_seq_len, must be in <data,addr> pairs\n");
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return -EINVAL;
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}
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ret = of_property_read_u32_array(dev->of_node, "qcom,emu-init-seq",
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qphy->emu_init_seq, qphy->emu_init_seq_len);
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if (ret) {
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dev_err(dev, "could not read emu-init-seq, returned %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, qphy);
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qphy->phy.label = "qcom-usb-emu-phy";
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qphy->phy.init = qcusb_emu_phy_init;
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qphy->phy.type = USB_PHY_TYPE_USB2;
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ret = usb_add_phy_dev(&qphy->phy);
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if (ret)
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return ret;
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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"qcratch_base");
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if (res) {
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qphy->qscratch_base = devm_ioremap_nocache(dev, res->start,
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resource_size(res));
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if (IS_ERR(qphy->qscratch_base)) {
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dev_dbg(dev, "error mapping qscratch\n");
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qphy->qscratch_base = NULL;
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}
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}
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return 0;
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}
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static int qcusb_emu_phy_remove(struct platform_device *pdev)
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{
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struct qcusb_emu_phy *qcphy = platform_get_drvdata(pdev);
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usb_remove_phy(&qcphy->phy);
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return 0;
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}
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static const struct of_device_id emu_phy_dt_ids[] = {
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{ .compatible = "qcom,usb-emu-phy" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, emu_phy_dt_ids);
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static struct platform_driver qcusb_emu_phy_driver = {
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.probe = qcusb_emu_phy_probe,
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.remove = qcusb_emu_phy_remove,
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.driver = {
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.name = "usb_emu_phy",
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.of_match_table = emu_phy_dt_ids,
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},
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};
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module_platform_driver(qcusb_emu_phy_driver);
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MODULE_DESCRIPTION("Qualcomm Technologies, Inc. USB Emulation PHY driver");
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MODULE_LICENSE("GPL v2");
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