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/*
* This file configures the internal USB PHY in OMAP4430. Used
* with TWL6030 transceiver and MUSB on OMAP4430.
*
* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Author: Hema HK <hemahk@ti.com>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/usb.h>
#include <plat/usb.h>
/* OMAP control module register for UTMI PHY */
#define CONTROL_DEV_CONF 0x300
#define PHY_PD 0x1
#define USBOTGHS_CONTROL 0x33c
#define AVALID BIT(0)
#define BVALID BIT(1)
#define VBUSVALID BIT(2)
#define SESSEND BIT(3)
#define IDDIG BIT(4)
static struct clk *phyclk, *clk48m, *clk32k;
static void __iomem *ctrl_base;
static int usbotghs_control;
int omap4430_phy_init(struct device *dev)
{
ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K);
if (!ctrl_base) {
dev_err(dev, "control module ioremap failed\n");
return -ENOMEM;
}
/* Power down the phy */
__raw_writel(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
phyclk = clk_get(dev, "ocp2scp_usb_phy_ick");
if (IS_ERR(phyclk)) {
dev_err(dev, "cannot clk_get ocp2scp_usb_phy_ick\n");
iounmap(ctrl_base);
return PTR_ERR(phyclk);
}
clk48m = clk_get(dev, "ocp2scp_usb_phy_phy_48m");
if (IS_ERR(clk48m)) {
dev_err(dev, "cannot clk_get ocp2scp_usb_phy_phy_48m\n");
clk_put(phyclk);
iounmap(ctrl_base);
return PTR_ERR(clk48m);
}
clk32k = clk_get(dev, "usb_phy_cm_clk32k");
if (IS_ERR(clk32k)) {
dev_err(dev, "cannot clk_get usb_phy_cm_clk32k\n");
clk_put(phyclk);
clk_put(clk48m);
iounmap(ctrl_base);
return PTR_ERR(clk32k);
}
return 0;
}
int omap4430_phy_set_clk(struct device *dev, int on)
{
static int state;
if (on && !state) {
/* Enable the phy clocks */
clk_enable(phyclk);
clk_enable(clk48m);
clk_enable(clk32k);
state = 1;
} else if (state) {
/* Disable the phy clocks */
clk_disable(phyclk);
clk_disable(clk48m);
clk_disable(clk32k);
state = 0;
}
return 0;
}
int omap4430_phy_power(struct device *dev, int ID, int on)
{
if (on) {
if (ID)
/* enable VBUS valid, IDDIG groung */
__raw_writel(AVALID | VBUSVALID, ctrl_base +
USBOTGHS_CONTROL);
else
/*
* Enable VBUS Valid, AValid and IDDIG
* high impedence
*/
__raw_writel(IDDIG | AVALID | VBUSVALID,
ctrl_base + USBOTGHS_CONTROL);
} else {
/* Enable session END and IDIG to high impedence. */
__raw_writel(SESSEND | IDDIG, ctrl_base +
USBOTGHS_CONTROL);
}
return 0;
}
int omap4430_phy_suspend(struct device *dev, int suspend)
{
if (suspend) {
/* Disable the clocks */
omap4430_phy_set_clk(dev, 0);
/* Power down the phy */
__raw_writel(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
/* save the context */
usbotghs_control = __raw_readl(ctrl_base + USBOTGHS_CONTROL);
} else {
/* Enable the internel phy clcoks */
omap4430_phy_set_clk(dev, 1);
/* power on the phy */
if (__raw_readl(ctrl_base + CONTROL_DEV_CONF) & PHY_PD) {
__raw_writel(~PHY_PD, ctrl_base + CONTROL_DEV_CONF);
mdelay(200);
}
/* restore the context */
__raw_writel(usbotghs_control, ctrl_base + USBOTGHS_CONTROL);
}
return 0;
}
int omap4430_phy_exit(struct device *dev)
{
if (ctrl_base)
iounmap(ctrl_base);
if (phyclk)
clk_put(phyclk);
if (clk48m)
clk_put(clk48m);
if (clk32k)
clk_put(clk32k);
return 0;
}
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