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/* USB Host (EHCI) support for Samsung Tuna Board.
*
* Copyright (C) 2011 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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/gpio.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <plat/usb.h>
#include "board-tuna.h"
#include "mux.h"
#define GPIO_USB3333_RESETB 159
static struct usbhs_omap_board_data usbhs_bdata = {
.port_mode[0] = OMAP_EHCI_PORT_MODE_PHY,
.port_mode[1] = OMAP_USBHS_PORT_MODE_UNUSED,
.port_mode[2] = OMAP_USBHS_PORT_MODE_UNUSED,
.phy_reset = false,
.reset_gpio_port[0] = -EINVAL,
.reset_gpio_port[1] = -EINVAL,
.reset_gpio_port[2] = -EINVAL
};
void __init omap4_ehci_init(void)
{
int ret = 0;
struct clk *phy_ref_clk;
omap_mux_init_gpio(GPIO_USB3333_RESETB, OMAP_PIN_OUTPUT |
OMAP_PIN_OFF_NONE);
ret = gpio_request(GPIO_USB3333_RESETB, "usb3333_resetb");
if (ret) {
pr_err("omap: ehci: Cannot request GPIO %d",
GPIO_USB3333_RESETB);
return;
}
gpio_direction_output(GPIO_USB3333_RESETB, 0);
gpio_set_value(GPIO_USB3333_RESETB, 0);
/* FREF_CLK3 provides the 19.2 MHz reference clock to the PHY */
omap_mux_init_signal("fref_clk3_out", OMAP_PIN_OUTPUT | OMAP_MUX_MODE0);
phy_ref_clk = clk_get(NULL, "auxclk3_ck");
if (IS_ERR(phy_ref_clk)) {
pr_err("omap: ehci: Cannot request auxclk3");
return;
}
ret = clk_set_rate(phy_ref_clk, 19200000);
if (ret < 0) {
pr_err("omap: ehci: Cannot clk_set_rate auxclk3 err %d", ret);
return;
}
ret = clk_enable(phy_ref_clk);
if (ret < 0) {
pr_err("omap: ehci: Cannot clk_enable auxclk3 err %d", ret);
return;
}
udelay(100);
gpio_set_value(GPIO_USB3333_RESETB, 1);
/* Everything went well with phy clock, pass it to ehci driver for
* low power managment now
*/
usbhs_bdata.transceiver_clk[0] = phy_ref_clk;
usbhs_init(&usbhs_bdata);
pr_info("usb:ehci initialized");
return;
}
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