[U-Boot] [PATCH 2/3] DA8xx: Add MUSB host support

Ajay Kumar Gupta ajay.gupta at ti.com
Thu Nov 12 16:39:16 CET 2009


Tested USB host functionality on DA830 EVM.

Signed-off-by: Ajay Kumar Gupta <ajay.gupta at ti.com>
Signed-off-by: Swaminathan S <swami.iyer at ti.com>
---
 drivers/usb/musb/Makefile |    1 +
 drivers/usb/musb/da8xx.c  |  143 +++++++++++++++++++++++++++++++++++++++++++++
 drivers/usb/musb/da8xx.h  |   83 ++++++++++++++++++++++++++
 include/usb.h             |    3 +-
 4 files changed, 229 insertions(+), 1 deletions(-)
 create mode 100644 drivers/usb/musb/da8xx.c
 create mode 100644 drivers/usb/musb/da8xx.h

diff --git a/drivers/usb/musb/Makefile b/drivers/usb/musb/Makefile
index 09e0a5f..eb4d8fd 100644
--- a/drivers/usb/musb/Makefile
+++ b/drivers/usb/musb/Makefile
@@ -27,6 +27,7 @@ LIB	:= $(obj)libusb_musb.a
 
 COBJS-$(CONFIG_MUSB_HCD) += musb_hcd.o musb_core.o
 COBJS-$(CONFIG_USB_DAVINCI) += davinci.o
+COBJS-$(CONFIG_USB_DA8XX) += da8xx.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
new file mode 100644
index 0000000..9e4ba70
--- /dev/null
+++ b/drivers/usb/musb/da8xx.c
@@ -0,0 +1,143 @@
+/*
+ * da8xx.c - TI's DA8xx platform specific usb wrapper functions.
+ *
+ * Author: Ajay Kumar Gupta <ajay.gupta at ti.com>
+ *
+ * Based on drivers/usb/musb/davinci.c
+ *
+ * Copyright (c) 2009 Texas Instruments Incorporated
+ *
+ * This package is free software;  you can redistribute it and/or
+ * modify it under the terms of the license found in the file
+ * named COPYING that should have accompanied this file.
+ *
+ * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+#include <common.h>
+
+#ifdef CONFIG_USB_DA8XX
+
+#include "da8xx.h"
+
+/* MUSB platform configuration */
+struct musb_config musb_cfg = {
+	(struct	musb_regs *)DA8XX_USB_OTG_CORE_BASE,
+	DA8XX_USB_OTG_TIMEOUT,
+	0
+};
+
+/*
+ * This function enables VBUS by driving the GPIO Bank4 Pin 15 high.
+ */
+static void enable_vbus(void)
+{
+	u32 value;
+
+	/* configure GPIO bank4 pin 15 in output direction */
+	value = readl(DAVINCI_GPIO_BASE + BANK4_REG_DIR_ADDR);
+	writel((value & (~USB_VBUS_GPIO)),
+			(DAVINCI_GPIO_BASE + BANK4_REG_DIR_ADDR));
+
+	/* set GPIO bank4 pin 15 high to drive VBUS */
+	value = readl(DAVINCI_GPIO_BASE + BANK4_REG_SET_ADDR);
+	writel((value | USB_VBUS_GPIO),
+			(DAVINCI_GPIO_BASE + BANK4_REG_SET_ADDR));
+}
+
+/*
+ * Enable the usb0 phy. This initialization procedure is explained in
+ * the DA8xx USB user guide document.
+ */
+static u8 phy_on(void)
+{
+	u32 timeout;
+	u32 cfgchip2;
+
+	cfgchip2 = readl(DAVINCI_BOOTCFG_BASE + CFGCHIP2);
+
+	cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN |
+			CFGCHIP2_OTGMODE | CFGCHIP2_REFFREQ);
+	cfgchip2 |= CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN | CFGCHIP2_PHY_PLLON |
+			CFGCHIP2_REFFREQ_24MHZ;
+
+	writel(cfgchip2, (DAVINCI_BOOTCFG_BASE + CFGCHIP2));
+
+	/* wait until the usb phy pll locks */
+	timeout = musb_cfg.timeout;
+	while (timeout--)
+		if (readl(DAVINCI_BOOTCFG_BASE + CFGCHIP2) & CFGCHIP2_PHYCLKGD)
+			return 1;
+
+	/* USB phy was not turned on */
+	return 0;
+}
+
+/*
+ * Disable the usb phy
+ */
+static void phy_off(void)
+{
+	u32 cfgchip2;
+
+	/*
+	 * Power down the on-chip PHY.
+	 */
+	cfgchip2 = readl(DAVINCI_BOOTCFG_BASE + CFGCHIP2);
+
+	cfgchip2 &= ~CFGCHIP2_PHY_PLLON;
+	cfgchip2 |= CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN;
+	writel(cfgchip2, (DAVINCI_BOOTCFG_BASE + CFGCHIP2));
+}
+
+/*
+ * This function performs DA8xx platform specific initialization for usb0.
+ */
+int musb_platform_init(void)
+{
+	u32  revision;
+
+	/* enable psc for usb2.0 */
+	lpsc_on(33);
+
+	/* enable usb vbus */
+	enable_vbus();
+
+	/* reset the controller */
+	writel(0x1, (DA8XX_USB_OTG_BASE + DA8XX_USB_CTRL_REG));
+	udelay(5000);
+
+	/* start the on-chip usb phy and its pll */
+	if (phy_on() == 0)
+		return -1;
+
+	/* Returns zero if e.g. not clocked */
+	revision = readl(DA8XX_USB_OTG_BASE + DA8XX_USB_VERSION_REG);
+	if (revision == 0)
+		return -1;
+
+	/* Disable all interrupts */
+	writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK
+			| DA8XX_USB_RXINT_MASK),
+		(DA8XX_USB_OTG_BASE + DA8XX_USB_INT_MASK_SET_REG));
+	return 0;
+}
+
+/*
+ * This function performs DA8xx platform specific deinitialization for usb0.
+ */
+void musb_platform_deinit(void)
+{
+	/* Turn of the phy */
+	phy_off();
+
+	/* flush any interrupts */
+	writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
+			DA8XX_USB_RXINT_MASK),
+			(DA8XX_USB_OTG_BASE + DA8XX_USB_INT_MASK_CLR_REG));
+	writel(0, (DA8XX_USB_OTG_BASE + DA8XX_USB_EOI_REG));
+}
+
+#endif /* CONFIG_USB_DA8XX */
diff --git a/drivers/usb/musb/da8xx.h b/drivers/usb/musb/da8xx.h
new file mode 100644
index 0000000..9441777
--- /dev/null
+++ b/drivers/usb/musb/da8xx.h
@@ -0,0 +1,83 @@
+/*
+ * da8xx.h -- TI's DA8xx platform specific usb wrapper definitions.
+ *
+ * Author: Ajay Kumar Gupta <ajay.gupta at ti.com>
+ *
+ * Based on drivers/usb/musb/davinci.h
+ *
+ * Copyright (c) 2009 Texas Instruments Incorporated
+ *
+ * This package is free software;  you can redistribute it and/or
+ * modify it under the terms of the license found in the file
+ * named COPYING that should have accompanied this file.
+ *
+ * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+#ifndef __DA8XX_MUSB_H__
+#define __DA8XX_MUSB_H__
+
+#include "musb_core.h"
+
+/* extern functions */
+extern void lpsc_on(unsigned int id);
+
+/* Base address of da8xx usb0 wrapper */
+#define DA8XX_USB_OTG_BASE  0x01E00000
+
+/* Base address of da8xx musb core */
+#define DA8XX_USB_OTG_CORE_BASE (DA8XX_USB_OTG_BASE + 0x400)
+
+/* Timeout for DA8xx usb module */
+#define DA8XX_USB_OTG_TIMEOUT 0x3FFFFFF
+
+/* For now include usb OTG module registers here */
+#define DA8XX_USB_VERSION_REG			0x00
+#define DA8XX_USB_CTRL_REG			0x04
+#define DA8XX_USB_INT_MASK_SET_REG		0x30
+#define DA8XX_USB_INT_MASK_CLR_REG		0x34
+#define DA8XX_USB_EOI_REG			0x3c
+
+#define DA8XX_USB_TX_ENDPTS_MASK  0x1f		  /* ep0 + 4 tx */
+#define DA8XX_USB_RX_ENDPTS_MASK  0x1e		  /* 4 rx */
+#define DA8XX_USB_TXINT_SHIFT	  0
+#define DA8XX_USB_RXINT_SHIFT	  8
+
+#define DA8XX_USB_USBINT_MASK	  0x01ff0000  /* 8 Mentor, DRVVBUS */
+#define DA8XX_USB_TXINT_MASK \
+		(DA8XX_USB_TX_ENDPTS_MASK << DA8XX_USB_TXINT_SHIFT)
+#define DA8XX_USB_RXINT_MASK \
+		(DA8XX_USB_RX_ENDPTS_MASK << DA8XX_USB_RXINT_SHIFT)
+
+/* DA8xx CFGCHIP2 (USB 2.0 PHY Control) register bits */
+#define CFGCHIP2_PHYCLKGD	(1 << 17)
+#define CFGCHIP2_VBUSSENSE	(1 << 16)
+#define CFGCHIP2_RESET		(1 << 15)
+#define CFGCHIP2_OTGMODE	(3 << 13)
+#define CFGCHIP2_NO_OVERRIDE	(0 << 13)
+#define CFGCHIP2_FORCE_HOST	(1 << 13)
+#define CFGCHIP2_FORCE_DEVICE 	(2 << 13)
+#define CFGCHIP2_FORCE_HOST_VBUS_LOW (3 << 13)
+#define CFGCHIP2_USB1PHYCLKMUX	(1 << 12)
+#define CFGCHIP2_USB2PHYCLKMUX	(1 << 11)
+#define CFGCHIP2_PHYPWRDN	(1 << 10)
+#define CFGCHIP2_OTGPWRDN	(1 << 9)
+#define CFGCHIP2_DATPOL 	(1 << 8)
+#define CFGCHIP2_USB1SUSPENDM	(1 << 7)
+#define CFGCHIP2_PHY_PLLON	(1 << 6)	/* override PLL suspend */
+#define CFGCHIP2_SESENDEN	(1 << 5)	/* Vsess_end comparator */
+#define CFGCHIP2_VBDTCTEN	(1 << 4)	/* Vbus comparator */
+#define CFGCHIP2_REFFREQ	(0xf << 0)
+#define CFGCHIP2_REFFREQ_12MHZ	(1 << 0)
+#define CFGCHIP2_REFFREQ_24MHZ	(2 << 0)
+#define CFGCHIP2_REFFREQ_48MHZ	(3 << 0)
+
+#define BANK4_REG_DIR_ADDR	0x60
+#define BANK4_REG_SET_ADDR	0x68
+#define USB_VBUS_GPIO		(1 << 15)
+
+#define CFGCHIP2		0x184
+#endif	/* __DA8XX_MUSB_H__ */
+
diff --git a/include/usb.h b/include/usb.h
index 7c47098..7c56ace 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -183,7 +183,8 @@ struct usb_device {
 #if defined(CONFIG_USB_UHCI) || defined(CONFIG_USB_OHCI) || \
 	defined(CONFIG_USB_EHCI) || defined(CONFIG_USB_OHCI_NEW) || \
 	defined(CONFIG_USB_SL811HS) || defined(CONFIG_USB_ISP116X_HCD) || \
-	defined(CONFIG_USB_R8A66597_HCD) || defined(CONFIG_USB_DAVINCI)
+	defined(CONFIG_USB_R8A66597_HCD) || defined(CONFIG_USB_DAVINCI) || \
+	defined(CONFIG_USB_DA8XX)
 
 int usb_lowlevel_init(void);
 int usb_lowlevel_stop(void);
-- 
1.6.2.4



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