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/*
* Copyright (C) 2005-2011 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/fsl_devices.h>
#include <mach/arc_otg.h>
#include "usb.h"
#include "iomux.h"
#include "mx51_pins.h"
/*
* USB Host2 HS port
*/
static int gpio_usbh2_active(void)
{
/* Set USBH2_STP to GPIO and toggle it */
mxc_request_iomux(MX51_PIN_EIM_A26, IOMUX_CONFIG_GPIO);
gpio_request(IOMUX_TO_GPIO(MX51_PIN_EIM_A26), "eim_a26");
gpio_direction_output(IOMUX_TO_GPIO(MX51_PIN_EIM_A26), 0);
gpio_set_value(IOMUX_TO_GPIO(MX51_PIN_EIM_A26), 1);
msleep(100);
return 0;
}
static void gpio_usbh2_inactive(void)
{
gpio_free(IOMUX_TO_GPIO(MX51_PIN_EIM_A26));
mxc_free_iomux(MX51_PIN_EIM_A26, IOMUX_CONFIG_GPIO);
}
static void _wake_up_enable(struct fsl_usb2_platform_data *pdata, bool enable)
{
printk(KERN_DEBUG "host2, %s, enable is %d\n", __func__, enable);
if (enable)
USBCTRL_HOST2 |= UCTRL_H2WIE;
else {
USBCTRL_HOST2 &= ~UCTRL_H2WIE;
/* The interrupt must be disabled for at least 3
* cycles of the standby clock(32k Hz) , that is 0.094 ms*/
udelay(100);
}
}
static void _phy_lowpower_suspend(struct fsl_usb2_platform_data *pdata, bool enable)
{
printk(KERN_DEBUG "host2, %s, enable is %d\n", __func__, enable);
if (enable) {
UH2_PORTSC1 |= PORTSC_PHCD;
} else {
UH2_PORTSC1 &= ~PORTSC_PHCD;
}
}
static void fsl_usbh2_clock_gate(bool on)
{
struct clk *usb_clk;
if (on) {
usb_clk = clk_get(NULL, "usb_ahb_clk");
clk_enable(usb_clk);
clk_put(usb_clk);
usb_clk = clk_get(NULL, "usboh3_clk");
clk_enable(usb_clk);
clk_put(usb_clk);
} else {
usb_clk = clk_get(NULL, "usb_ahb_clk");
clk_disable(usb_clk);
clk_put(usb_clk);
usb_clk = clk_get(NULL, "usboh3_clk");
clk_disable(usb_clk);
clk_put(usb_clk);
}
}
static enum usb_wakeup_event _is_usbh2_wakeup(struct fsl_usb2_platform_data *pdata)
{
int wakeup_req = USBCTRL & UCTRL_H2WIR;
if (wakeup_req)
return !WAKEUP_EVENT_INVALID;
return WAKEUP_EVENT_INVALID;
}
static void h2_wakeup_handler(struct fsl_usb2_platform_data *pdata)
{
_wake_up_enable(pdata, false);
_phy_lowpower_suspend(pdata, false);
pdata->wakeup_event = 1;
}
static void usbh2_wakeup_event_clear(void)
{
int wakeup_req = USBCTRL & UCTRL_H2WIR;
if (wakeup_req != 0) {
printk(KERN_INFO "Unknown wakeup.(OTGSC 0x%x)\n", UOG_OTGSC);
/* Disable H2WIE to clear H2WIR, wait 3 clock
* cycles of standly clock(32KHz)
*/
USBCTRL &= ~UCTRL_H2WIE;
udelay(100);
USBCTRL |= UCTRL_H2WIE;
}
}
static int fsl_usb_host_init_ext(struct platform_device *pdev)
{
int ret = 0;
struct clk *usb_clk;
usb_clk = clk_get(NULL, "usboh3_clk");
clk_enable(usb_clk);
clk_put(usb_clk);
/* on mx53, there is a hardware limitation that when switch the host2's clk mode
* ,usb phy1 clk must be on, after finish switching this clk can be off */
if (cpu_is_mx53()) {
usb_clk = clk_get(NULL, "usb_phy1_clk");
clk_enable(usb_clk);
clk_put(usb_clk);
}
ret = fsl_usb_host_init(pdev);
if (cpu_is_mx53()) {
usb_clk = clk_get(NULL, "usb_phy1_clk");
clk_disable(usb_clk);
clk_put(usb_clk);
}
/* setback USBH2_STP to be function */
mxc_request_iomux(MX51_PIN_EIM_A26, IOMUX_CONFIG_ALT2);
return ret;
}
static void fsl_usb_host_uninit_ext(struct fsl_usb2_platform_data *pdata)
{
struct clk *usb_clk;
usb_clk = clk_get(NULL, "usboh3_clk");
clk_disable(usb_clk);
clk_put(usb_clk);
fsl_usb_host_uninit(pdata);
}
static struct fsl_usb2_platform_data usbh2_config = {
.name = "Host 2",
.platform_init = fsl_usb_host_init_ext,
.platform_uninit = fsl_usb_host_uninit_ext,
.operating_mode = FSL_USB2_MPH_HOST,
.phy_mode = FSL_USB2_PHY_ULPI,
.power_budget = 500, /* 500 mA max power */
.wake_up_enable = _wake_up_enable,
.usb_clock_for_pm = fsl_usbh2_clock_gate,
.phy_lowpower_suspend = _phy_lowpower_suspend,
.gpio_usb_active = gpio_usbh2_active,
.gpio_usb_inactive = gpio_usbh2_inactive,
.is_wakeup_event = _is_usbh2_wakeup,
.wakeup_handler = h2_wakeup_handler,
.transceiver = "isp1504",
};
static struct fsl_usb2_wakeup_platform_data usbh2_wakeup_config = {
.name = "USBH2 wakeup",
.usb_clock_for_pm = fsl_usbh2_clock_gate,
.usb_pdata = {&usbh2_config, NULL, NULL},
.usb_wakeup_exhandle = usbh2_wakeup_event_clear,
};
void __init mx5_usbh2_init(void)
{
usbh2_config.wakeup_pdata = &usbh2_wakeup_config;
mxc_register_device(&mxc_usbh2_device, &usbh2_config);
mxc_register_device(&mxc_usbh2_wakeup_device, &usbh2_wakeup_config);
}
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