iMX28: Add USB HOST driver

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>

diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 51b2494328241167be357fe7c9335d6917a6fc84..09abb754d46703116158862cf741ca6a85170045 100644 (file)
--- 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 (file)
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;
+}