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iMX28: Add USB HOST driver

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This driver supports both EHCI ports on the i.MX28 CPU.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Remy Bohmer <linux@bohmer.net>
This commit is contained in:
Marek Vasut 2011-11-08 23:18:26 +00:00 committed by Stefano Babic
parent b2d20161f7
commit dbb8f27901
2 changed files with 155 additions and 0 deletions
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1
drivers/usb/host/Makefile
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@ -41,6 +41,7 @@ else
COBJS-$(CONFIG_USB_EHCI_FSL) += ehci-fsl.o
endif
COBJS-$(CONFIG_USB_EHCI_MXC) += ehci-mxc.o
COBJS-$(CONFIG_USB_EHCI_MXS) += ehci-mxs.o
COBJS-$(CONFIG_USB_EHCI_PPC4XX) += ehci-ppc4xx.o
COBJS-$(CONFIG_USB_EHCI_IXP4XX) += ehci-ixp.o
COBJS-$(CONFIG_USB_EHCI_KIRKWOOD) += ehci-kirkwood.o

154
drivers/usb/host/ehci-mxs.c Normal file
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@ -0,0 +1,154 @@
/*
* Freescale i.MX28 USB Host driver
*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
* on behalf of DENX Software Engineering GmbH
*
* 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.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/regs-common.h>
#include <asm/arch/regs-base.h>
#include <asm/arch/regs-clkctrl.h>
#include <asm/arch/regs-usb.h>
#include <asm/arch/regs-usbphy.h>
#include "ehci-core.h"
#include "ehci.h"
#if (CONFIG_EHCI_MXS_PORT != 0) && (CONFIG_EHCI_MXS_PORT != 1)
#error "MXS EHCI: Invalid port selected!"
#endif
#ifndef CONFIG_EHCI_MXS_PORT
#error "MXS EHCI: Please define correct port using CONFIG_EHCI_MXS_PORT!"
#endif
static struct ehci_mxs {
struct mx28_usb_regs *usb_regs;
struct mx28_usbphy_regs *phy_regs;
} ehci_mxs;
int mxs_ehci_get_port(struct ehci_mxs *mxs_usb, int port)
{
uint32_t usb_base, phy_base;
switch (port) {
case 0:
usb_base = MXS_USBCTRL0_BASE;
phy_base = MXS_USBPHY0_BASE;
break;
case 1:
usb_base = MXS_USBCTRL1_BASE;
phy_base = MXS_USBPHY1_BASE;
break;
default:
printf("CONFIG_EHCI_MXS_PORT (port = %d)\n", port);
return -1;
}
mxs_usb->usb_regs = (struct mx28_usb_regs *)usb_base;
mxs_usb->phy_regs = (struct mx28_usbphy_regs *)phy_base;
return 0;
}
/* This DIGCTL register ungates clock to USB */
#define HW_DIGCTL_CTRL 0x8001c000
#define HW_DIGCTL_CTRL_USB0_CLKGATE (1 << 2)
#define HW_DIGCTL_CTRL_USB1_CLKGATE (1 << 16)
int ehci_hcd_init(void)
{
int ret;
uint32_t usb_base, cap_base;
struct mx28_register *digctl_ctrl =
(struct mx28_register *)HW_DIGCTL_CTRL;
struct mx28_clkctrl_regs *clkctrl_regs =
(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
ret = mxs_ehci_get_port(&ehci_mxs, CONFIG_EHCI_MXS_PORT);
if (ret)
return ret;
/* Reset the PHY block */
writel(USBPHY_CTRL_SFTRST, &ehci_mxs.phy_regs->hw_usbphy_ctrl_set);
udelay(10);
writel(USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE,
&ehci_mxs.phy_regs->hw_usbphy_ctrl_clr);
/* Enable USB clock */
writel(CLKCTRL_PLL0CTRL0_EN_USB_CLKS | CLKCTRL_PLL0CTRL0_POWER,
&clkctrl_regs->hw_clkctrl_pll0ctrl0_set);
writel(CLKCTRL_PLL1CTRL0_EN_USB_CLKS | CLKCTRL_PLL1CTRL0_POWER,
&clkctrl_regs->hw_clkctrl_pll1ctrl0_set);
writel(HW_DIGCTL_CTRL_USB0_CLKGATE | HW_DIGCTL_CTRL_USB1_CLKGATE,
&digctl_ctrl->reg_clr);
/* Start USB PHY */
writel(0, &ehci_mxs.phy_regs->hw_usbphy_pwd);
/* Enable UTMI+ Level 2 and Level 3 compatibility */
writel(USBPHY_CTRL_ENUTMILEVEL3 | USBPHY_CTRL_ENUTMILEVEL2 | 1,
&ehci_mxs.phy_regs->hw_usbphy_ctrl_set);
usb_base = ((uint32_t)ehci_mxs.usb_regs) + 0x100;
hccr = (struct ehci_hccr *)usb_base;
cap_base = ehci_readl(&hccr->cr_capbase);
hcor = (struct ehci_hcor *)(usb_base + HC_LENGTH(cap_base));
return 0;
}
int ehci_hcd_stop(void)
{
int ret;
uint32_t tmp;
struct mx28_register *digctl_ctrl =
(struct mx28_register *)HW_DIGCTL_CTRL;
struct mx28_clkctrl_regs *clkctrl_regs =
(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
ret = mxs_ehci_get_port(&ehci_mxs, CONFIG_EHCI_MXS_PORT);
if (ret)
return ret;
/* Stop the USB port */
tmp = ehci_readl(&hcor->or_usbcmd);
tmp &= ~CMD_RUN;
ehci_writel(tmp, &hcor->or_usbcmd);
/* Disable the PHY */
tmp = USBPHY_PWD_RXPWDRX | USBPHY_PWD_RXPWDDIFF |
USBPHY_PWD_RXPWD1PT1 | USBPHY_PWD_RXPWDENV |
USBPHY_PWD_TXPWDV2I | USBPHY_PWD_TXPWDIBIAS |
USBPHY_PWD_TXPWDFS;
writel(tmp, &ehci_mxs.phy_regs->hw_usbphy_pwd);
/* Disable USB clock */
writel(CLKCTRL_PLL0CTRL0_EN_USB_CLKS,
&clkctrl_regs->hw_clkctrl_pll0ctrl0_clr);
writel(CLKCTRL_PLL1CTRL0_EN_USB_CLKS,
&clkctrl_regs->hw_clkctrl_pll1ctrl0_clr);
/* Gate off the USB clock */
writel(HW_DIGCTL_CTRL_USB0_CLKGATE | HW_DIGCTL_CTRL_USB1_CLKGATE,
&digctl_ctrl->reg_set);
return 0;
}