[U-Boot] [PATCH 19/20] iMX28: Add USB HOST driver

Stefano Babic
2011-11-10T13:15:48Z

On 11/09/2011 10:18 AM, Marek Vasut wrote:
> 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>
> ---
> drivers/usb/host/Makefile | 1 +
> drivers/usb/host/ehci-mxs.c | 154 +++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 155 insertions(+), 0 deletions(-)
> create mode 100644 drivers/usb/host/ehci-mxs.c
>
> diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
> index 51b2494..09abb75 100644
> --- a/drivers/usb/host/Makefile
> +++ b/drivers/usb/host/Makefile
> @@ -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
> diff --git a/drivers/usb/host/ehci-mxs.c b/drivers/usb/host/ehci-mxs.c
> new file mode 100644
> index 0000000..c795f23
> --- /dev/null
> +++ b/drivers/usb/host/ehci-mxs.c
> @@ -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;
> +}
Applied to u-boot-imx, thanks.

Best regards,
Stefano Babic

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