usb : musb : Adding DM6446 (TI DaVinci) platform specific USB support

Adding DM6446 (TI DaVinci) platform specific USB functionality for
USB Phy and VBUS initialization.

Signed-off-by: Ravi Babu <ravibabu@ti.com>
Signed-off-by: Swaminathan S <swami.iyer@ti.com>
Signed-off-by: Thomas Abraham <t-abraham@ti.com>
Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: Remy Bohmer <linux@bohmer.net>

1 files changed, 106 insertions, 0 deletions

diff --git a/drivers/usb/davinci_usb.c b/drivers/usb/davinci_usb.c
new file mode 100644
index 0000000..e66f660
--- /dev/null
+++ b/drivers/usb/davinci_usb.c
@@ -0,0 +1,106 @@
+/*
+ * TI's Davinci platform specific USB wrapper functions.
+ *
+ * Copyright (c) 2008 Texas Instruments
+ *
+ * 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
+ *
+ * Author: Thomas Abraham t-abraham@ti.com, Texas Instruments
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include "davinci_usb.h"
+
+/* MUSB platform configuration */
+struct musb_config musb_cfg = {
+	(struct	musb_regs *)MENTOR_USB0_BASE,
+	DAVINCI_USB_TIMEOUT,
+	0
+};
+
+/* MUSB module register overlay */
+struct davinci_usb_regs *dregs;
+
+/*
+ * Enable the USB phy
+ */
+static u8 phy_on(void)
+{
+	u32 timeout;
+
+	/* Wait until the USB phy is turned on */
+	writel(USBPHY_SESNDEN | USBPHY_VBDTCTEN, USBPHY_CTL_PADDR);
+	timeout = musb_cfg.timeout;
+	while (timeout--)
+		if (readl(USBPHY_CTL_PADDR) & USBPHY_PHYCLKGD)
+			return 1;
+
+	/* USB phy was not turned on */
+	return 0;
+}
+
+/*
+ * Disable the USB phy
+ */
+static void phy_off(void)
+{
+	/* powerdown the on-chip PHY and its oscillator */
+	writel(USBPHY_OSCPDWN | USBPHY_PHYPDWN, USBPHY_CTL_PADDR);
+}
+
+/*
+ * This function performs Davinci platform specific initialization for usb0.
+ */
+int musb_platform_init(void)
+{
+	u32  revision;
+
+	/* enable USB VBUS */
+	enable_vbus();
+
+	/* start the on-chip USB phy and its pll */
+	if (!phy_on())
+		return -1;
+
+	/* reset the controller */
+	dregs = (struct davinci_usb_regs *)DAVINCI_USB0_BASE;
+	writel(1, &dregs->ctrlr);
+	udelay(5000);
+
+	/* Returns zero if e.g. not clocked */
+	revision = readl(&dregs->version);
+	if (!revision)
+		return -1;
+
+	/* Disable all interrupts */
+	writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_RXINT_MASK |
+			DAVINCI_USB_TXINT_MASK , &dregs->intmsksetr);
+	return 0;
+}
+
+/*
+ * This function performs Davinci platform specific deinitialization for usb0.
+ */
+void musb_platform_deinit(void)
+{
+	/* Turn of the phy */
+	phy_off();
+
+	/* flush any interrupts */
+	writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK |
+			DAVINCI_USB_RXINT_MASK , &dregs->intclrr);
+}