[U-Boot] [PATCH v3 3/5] usb : musb : Adding DM6446 (TI DaVinci) platform specific USB support
Thomas Abraham
t-abraham at ti.com
Sun Jan 4 05:11:13 CET 2009
Adding DM6446 (TI DaVinci) platform specific USB functionality for
USB Phy and VBUS initialization.
Signed-off-by: Ravi Babu <ravibabu at ti.com>
Signed-off-by: Swaminathan S <swami.iyer at ti.com>
Signed-off-by: Thomas Abraham <t-abraham at ti.com>
Signed-off-by: Ajay Kumar Gupta <ajay.gupta at ti.com>
---
drivers/usb/Makefile | 1 +
drivers/usb/davinci_usb.c | 106 +++++++++++++++++++++++++++++++++++++++++++++
drivers/usb/davinci_usb.h | 87 +++++++++++++++++++++++++++++++++++++
3 files changed, 194 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/davinci_usb.c
create mode 100644 drivers/usb/davinci_usb.h
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index 94eea70..3a2706d 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -36,6 +36,7 @@ COBJS-$(CONFIG_USB_R8A66597_HCD) += r8a66597-hcd.o
COBJS-$(CONFIG_USB_SL811HS) += sl811_usb.o
COBJS-$(CONFIG_USB_EHCI_FSL) += usb_ehci_fsl.o
COBJS-$(CONFIG_MUSB_HCD) += musb_hcd.o musb_core.o
+COBJS-$(CONFIG_USB_DAVINCI) += davinci_usb.o
# device
ifdef CONFIG_USB_DEVICE
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 at 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);
+}
diff --git a/drivers/usb/davinci_usb.h b/drivers/usb/davinci_usb.h
new file mode 100644
index 0000000..d270861
--- /dev/null
+++ b/drivers/usb/davinci_usb.h
@@ -0,0 +1,87 @@
+/*
+ * 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 at ti.com, Texas Instruments
+ */
+
+#ifndef __DAVINCI_USB_H__
+#define __DAVINCI_USB_H__
+
+#include <asm/arch/hardware.h>
+#include "musb_core.h"
+
+/* Base address of DAVINCI usb0 wrapper */
+#define DAVINCI_USB0_BASE 0x01C64000
+
+/* Base address of DAVINCI musb core */
+#define MENTOR_USB0_BASE (DAVINCI_USB0_BASE+0x400)
+
+/*
+ * Davinci platform USB wrapper register overlay. Note: Only the required
+ * registers are included in this structure. It can be expanded as required.
+ */
+struct davinci_usb_regs {
+ u32 version;
+ u32 ctrlr;
+ u32 reserved[0x20];
+ u32 intclrr;
+ u32 intmskr;
+ u32 intmsksetr;
+};
+
+#define DAVINCI_USB_TX_ENDPTS_MASK 0x1f /* ep0 + 4 tx */
+#define DAVINCI_USB_RX_ENDPTS_MASK 0x1e /* 4 rx */
+#define DAVINCI_USB_USBINT_SHIFT 16
+#define DAVINCI_USB_TXINT_SHIFT 0
+#define DAVINCI_USB_RXINT_SHIFT 8
+#define DAVINCI_INTR_DRVVBUS 0x0100
+
+#define DAVINCI_USB_USBINT_MASK 0x01ff0000 /* 8 Mentor, DRVVBUS */
+#define DAVINCI_USB_TXINT_MASK \
+ (DAVINCI_USB_TX_ENDPTS_MASK << DAVINCI_USB_TXINT_SHIFT)
+#define DAVINCI_USB_RXINT_MASK \
+ (DAVINCI_USB_RX_ENDPTS_MASK << DAVINCI_USB_RXINT_SHIFT)
+#define MGC_BUSCTL_OFFSET(_bEnd, _bOffset) \
+ (0x80 + (8*(_bEnd)) + (_bOffset))
+
+/* Integrated highspeed/otg PHY */
+#define USBPHY_CTL_PADDR (DAVINCI_SYSTEM_MODULE_BASE + 0x34)
+#define USBPHY_PHYCLKGD (1 << 8)
+#define USBPHY_SESNDEN (1 << 7) /* v(sess_end) comparator */
+#define USBPHY_VBDTCTEN (1 << 6) /* v(bus) comparator */
+#define USBPHY_PHYPLLON (1 << 4) /* override pll suspend */
+#define USBPHY_CLKO1SEL (1 << 3)
+#define USBPHY_OSCPDWN (1 << 2)
+#define USBPHY_PHYPDWN (1 << 0)
+
+/* Timeout for Davinci USB module */
+#define DAVINCI_USB_TIMEOUT 0x3FFFFFF
+
+/* IO Expander I2C address and VBUS enable mask */
+#define IOEXP_I2C_ADDR 0x3A
+#define IOEXP_VBUSEN_MASK 1
+
+/* extern functions */
+extern void lpsc_on(unsigned int id);
+extern int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len);
+extern int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len);
+extern void enable_vbus(void);
+#endif /* __DAVINCI_USB_H__ */
+
--
1.5.6
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