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