[PATCH 02/10] i.MX23: Add USB (phy) support

[Sascha Hauer]

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 arch/arm/mach-stm/Makefile                  |    2 +-
 arch/arm/mach-stm/include/mach/imx23-regs.h |    4 +
 arch/arm/mach-stm/include/mach/usb.h        |    6 ++
 arch/arm/mach-stm/usb.c                     |   92 +++++++++++++++++++++++++++
 4 files changed, 103 insertions(+), 1 deletions(-)
 create mode 100644 arch/arm/mach-stm/include/mach/usb.h
 create mode 100644 arch/arm/mach-stm/usb.c

diff --git a/arch/arm/mach-stm/Makefile b/arch/arm/mach-stm/Makefile
index 0ff8fd1..f70a994 100644
--- a/arch/arm/mach-stm/Makefile
+++ b/arch/arm/mach-stm/Makefile
@@ -1,4 +1,4 @@
 obj-y += imx.o iomux-imx.o reset-imx.o
 obj-$(CONFIG_DRIVER_VIDEO_STM) += imx_lcd_clk.o
-obj-$(CONFIG_ARCH_IMX23) += speed-imx23.o clocksource-imx23.o
+obj-$(CONFIG_ARCH_IMX23) += speed-imx23.o clocksource-imx23.o usb.o
 obj-$(CONFIG_ARCH_IMX28) += speed-imx28.o clocksource-imx28.o
diff --git a/arch/arm/mach-stm/include/mach/imx23-regs.h b/arch/arm/mach-stm/include/mach/imx23-regs.h
index caac19b..cc8c03e 100644
--- a/arch/arm/mach-stm/include/mach/imx23-regs.h
+++ b/arch/arm/mach-stm/include/mach/imx23-regs.h
@@ -38,5 +38,9 @@
 #define IMX_SSP1_BASE		0x80010000
 #define IMX_FB_BASE		0x80030000
 #define IMX_SSP2_BASE		0x80034000
+#define IMX_POWER_BASE		0x80044000
+#define IMX_USBPHY_BASE		0x8007c000
+#define IMX_DIGCTL_BASE		0x8001c000
+#define IMX_USB_BASE		0x80080000
 
 #endif /* __ASM_ARCH_MX23_REGS_H */
diff --git a/arch/arm/mach-stm/include/mach/usb.h b/arch/arm/mach-stm/include/mach/usb.h
new file mode 100644
index 0000000..af7d885
--- /dev/null
+++ b/arch/arm/mach-stm/include/mach/usb.h
@@ -0,0 +1,6 @@
+#ifndef __MACH_USB_H
+#define __MACH_USB_H
+
+int imx_usb_phy_enable(void);
+
+#endif /* __MACH_USB_H */
diff --git a/arch/arm/mach-stm/usb.c b/arch/arm/mach-stm/usb.c
new file mode 100644
index 0000000..d232bb6
--- /dev/null
+++ b/arch/arm/mach-stm/usb.c
@@ -0,0 +1,92 @@
+/*
+ * i.MX23/28 USBPHY setup
+ *
+ * Copyright 2011 Sascha Hauer, Pengutronix <s.hauer at pengutronix.de>
+ *
+ * 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 <mach/imx-regs.h>
+
+#define POWER_CTRL			(IMX_POWER_BASE + 0x0)
+#define POWER_CTRL_CLKGATE		0x40000000
+
+#define POWER_STS			(IMX_POWER_BASE + 0xc0)
+#define POWER_STS_VBUSVALID		0x00000002
+#define POWER_STS_BVALID		0x00000004
+#define POWER_STS_AVALID		0x00000008
+
+#define POWER_DEBUG			(IMX_POWER_BASE + 0x110)
+#define POWER_DEBUG_BVALIDPIOLOCK	0x00000002
+#define POWER_DEBUG_AVALIDPIOLOCK	0x00000004
+#define POWER_DEBUG_VBUSVALIDPIOLOCK	0x00000008
+
+#define USBPHY_PWD			(IMX_USBPHY_BASE + 0x0)
+
+#define USBPHY_CTRL			(IMX_USBPHY_BASE + 0x30)
+#define USBPHY_CTRL_SFTRST		0x80000000
+#define USBPHY_CTRL_CLKGATE		0x40000000
+
+#define CLK_PLLCTRL0			(IMX_CCM_BASE + 0x0)
+#define PLLCTRL0_EN_USB_CLKS 0x00040000
+
+#define DIGCTRL_CTRL			(IMX_DIGCTL_BASE + 0x0)
+#define DIGCTL_CTRL_USB_CLKGATE		0x00000004
+
+#define SET	0x4
+#define CLR	0x8
+
+int imx_usb_phy_enable(void)
+{
+	u32 reg;
+
+	/*
+	 * Set these bits so that we can force the OTG bits high
+	 * so the ARC core operates properly
+	 */
+	writel(POWER_CTRL_CLKGATE, POWER_CTRL + CLR);
+
+	writel(POWER_DEBUG_VBUSVALIDPIOLOCK |
+			   POWER_DEBUG_AVALIDPIOLOCK |
+			   POWER_DEBUG_BVALIDPIOLOCK, POWER_DEBUG + SET);
+
+	reg = readl(POWER_STS);
+	reg |= POWER_STS_BVALID | POWER_STS_AVALID | POWER_STS_VBUSVALID;
+	writel(reg, POWER_STS);
+
+	/* Reset USBPHY module */
+	writel(USBPHY_CTRL_SFTRST, USBPHY_CTRL + SET);
+	udelay(10);
+
+	/* Remove CLKGATE and SFTRST */
+	writel(USBPHY_CTRL_CLKGATE | USBPHY_CTRL_SFTRST, USBPHY_CTRL + CLR);
+
+	/* Turn on the USB clocks */
+	writel(PLLCTRL0_EN_USB_CLKS, CLK_PLLCTRL0 + SET);
+	writel(DIGCTL_CTRL_USB_CLKGATE, DIGCTRL_CTRL + CLR);
+
+	/* Power up the PHY */
+	writel(0, USBPHY_PWD);
+
+	/*
+	 * Set precharge bit to cure overshoot problems at the
+	 * start of packets
+	 */
+	writel(1, USBPHY_CTRL + SET);
+
+	return 0;
+}
+
-- 
1.7.2.3