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/* Copyright (c) 2010, Code Aurora Forum. 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.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/usb/gadget.h>
#include <linux/usb/chipidea.h>
#include <linux/clk.h>
#include <linux/reset.h>
#include "ci.h"
#define HS_PHY_AHB_MODE 0x0098
struct ci_hdrc_msm {
struct platform_device *ci;
struct clk *core_clk;
struct clk *iface_clk;
struct clk *fs_clk;
};
static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
{
struct device *dev = ci->gadget.dev.parent;
switch (event) {
case CI_HDRC_CONTROLLER_RESET_EVENT:
dev_dbg(dev, "CI_HDRC_CONTROLLER_RESET_EVENT received\n");
/* use AHB transactor, allow posted data writes */
hw_write_id_reg(ci, HS_PHY_AHB_MODE, 0xffffffff, 0x8);
usb_phy_init(ci->usb_phy);
break;
case CI_HDRC_CONTROLLER_STOPPED_EVENT:
dev_dbg(dev, "CI_HDRC_CONTROLLER_STOPPED_EVENT received\n");
/*
* Put the phy in non-driving mode. Otherwise host
* may not detect soft-disconnection.
*/
usb_phy_notify_disconnect(ci->usb_phy, USB_SPEED_UNKNOWN);
break;
default:
dev_dbg(dev, "unknown ci_hdrc event\n");
break;
}
}
static struct ci_hdrc_platform_data ci_hdrc_msm_platdata = {
.name = "ci_hdrc_msm",
.capoffset = DEF_CAPOFFSET,
.flags = CI_HDRC_REGS_SHARED |
CI_HDRC_DISABLE_STREAMING |
CI_HDRC_OVERRIDE_AHB_BURST,
.notify_event = ci_hdrc_msm_notify_event,
};
static int ci_hdrc_msm_probe(struct platform_device *pdev)
{
struct ci_hdrc_msm *ci;
struct platform_device *plat_ci;
struct usb_phy *phy;
struct clk *clk;
struct reset_control *reset;
int ret;
dev_dbg(&pdev->dev, "ci_hdrc_msm_probe\n");
ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
if (!ci)
return -ENOMEM;
platform_set_drvdata(pdev, ci);
/*
* OTG(PHY) driver takes care of PHY initialization, clock management,
* powering up VBUS, mapping of registers address space and power
* management.
*/
phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
if (IS_ERR(phy))
return PTR_ERR(phy);
ci_hdrc_msm_platdata.usb_phy = phy;
reset = devm_reset_control_get(&pdev->dev, "core");
if (IS_ERR(reset))
return PTR_ERR(reset);
ci->core_clk = clk = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(clk))
return PTR_ERR(clk);
ci->iface_clk = clk = devm_clk_get(&pdev->dev, "iface");
if (IS_ERR(clk))
return PTR_ERR(clk);
ci->fs_clk = clk = devm_clk_get(&pdev->dev, "fs");
if (IS_ERR(clk)) {
if (PTR_ERR(clk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
ci->fs_clk = NULL;
}
ret = clk_prepare_enable(ci->fs_clk);
if (ret)
return ret;
reset_control_assert(reset);
usleep_range(10000, 12000);
reset_control_deassert(reset);
clk_disable_unprepare(ci->fs_clk);
ret = clk_prepare_enable(ci->core_clk);
if (ret)
return ret;
ret = clk_prepare_enable(ci->iface_clk);
if (ret)
goto err_iface;
plat_ci = ci_hdrc_add_device(&pdev->dev,
pdev->resource, pdev->num_resources,
&ci_hdrc_msm_platdata);
if (IS_ERR(plat_ci)) {
dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
ret = PTR_ERR(plat_ci);
goto err_mux;
}
ci->ci = plat_ci;
pm_runtime_set_active(&pdev->dev);
pm_runtime_no_callbacks(&pdev->dev);
pm_runtime_enable(&pdev->dev);
return 0;
err_mux:
clk_disable_unprepare(ci->iface_clk);
err_iface:
clk_disable_unprepare(ci->core_clk);
return ret;
}
static int ci_hdrc_msm_remove(struct platform_device *pdev)
{
struct ci_hdrc_msm *ci = platform_get_drvdata(pdev);
pm_runtime_disable(&pdev->dev);
ci_hdrc_remove_device(ci->ci);
clk_disable_unprepare(ci->iface_clk);
clk_disable_unprepare(ci->core_clk);
return 0;
}
static const struct of_device_id msm_ci_dt_match[] = {
{ .compatible = "qcom,ci-hdrc", },
{ }
};
MODULE_DEVICE_TABLE(of, msm_ci_dt_match);
static struct platform_driver ci_hdrc_msm_driver = {
.probe = ci_hdrc_msm_probe,
.remove = ci_hdrc_msm_remove,
.driver = {
.name = "msm_hsusb",
.of_match_table = msm_ci_dt_match,
},
};
module_platform_driver(ci_hdrc_msm_driver);
MODULE_ALIAS("platform:msm_hsusb");
MODULE_ALIAS("platform:ci13xxx_msm");
MODULE_LICENSE("GPL v2");
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