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 --- drivers/usb/Makefile | 1 + drivers/usb/davinci_usb.c | 139 +++++++++++++++++++++++++++++++++++++++++++++ drivers/usb/davinci_usb.h | 98 +++++++++++++++++++++++++++++++ 3 files changed, 238 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 d93be2b..64cc591 100644 --- a/drivers/usb/Makefile +++ b/drivers/usb/Makefile @@ -34,6 +34,7 @@ COBJS-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o COBJS-$(CONFIG_USB_R8A66597_HCD) += r8a66597-hcd.o COBJS-$(CONFIG_USB_SL811HS) += sl811_usb.o COBJS-$(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..9c50606 --- /dev/null +++ b/drivers/usb/davinci_usb.c @@ -0,0 +1,139 @@ +/* + * 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> + +#ifdef CONFIG_USB_DAVINCI +#include <asm/io.h> +#include "davinci_usb.h" + +/* This function writes to a 32-bit register of platform usb wrapper */ +inline void pusb_writel(u32 offset, u32 value) +{ + writel(value, DAVINCI_USB0_BASE + offset); +} + +/* This function reads a 32-bit register of platform usb wrapper */ +inline u32 pusb_readl(u32 offset) +{ + return readl(DAVINCI_USB0_BASE + offset); +} + +/* This function writes to a 16-bit register of platform musb core */ +inline void musb_writew(u32 offset, u16 value) +{ + writew(value, MENTOR_USB0_BASE + offset); +} + +/* This function writes to a 8-bit register of platform musb core */ +inline void musb_writeb(u32 offset, u8 value) +{ + writeb(value, MENTOR_USB0_BASE + offset); +} + +/* This function reads a 16-bit register of platform usb wrapper */ +inline u16 musb_readw(u32 offset) +{ + return readw(MENTOR_USB0_BASE + offset); +} + +/* This function reads a 8-bit register of platform usb wrapper */ +inline u8 musb_readb(u32 offset) +{ + return readb(MENTOR_USB0_BASE + offset); +} + +/* + * 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 = DAVINCI_USB_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 */ + pusb_writel(DAVINCI_USB_CTRL_REG, 1); + udelay(5000); + + /* Returns zero if e.g. not clocked */ + revision = pusb_readl(DAVINCI_USB_VERSION_REG); + if (!revision) + return -1; + + /* Disable all interrupts */ + pusb_writel(DAVINCI_USB_INT_MASK_SET_REG, DAVINCI_USB_USBINT_MASK | + DAVINCI_USB_RXINT_MASK | DAVINCI_USB_TXINT_MASK); + 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 */ + pusb_writel(DAVINCI_USB_INT_MASK_CLR_REG, DAVINCI_USB_USBINT_MASK | + DAVINCI_USB_TXINT_MASK | DAVINCI_USB_RXINT_MASK); + pusb_writel(DAVINCI_USB_EOI_REG, 0); +} + +#endif /* CONFIG_USB_DAVINCI */ + diff --git a/drivers/usb/davinci_usb.h b/drivers/usb/davinci_usb.h new file mode 100644 index 0000000..c0b618f --- /dev/null +++ b/drivers/usb/davinci_usb.h @@ -0,0 +1,98 @@ +/* + * 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 + */ + +#ifndef __DAVINCI_USB_H__ +#define __DAVINCI_USB_H__ + +#include <asm/arch/hardware.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) + +/* Include usb OTG module registers here */ +#define DAVINCI_USB_VERSION_REG 0x00 +#define DAVINCI_USB_CTRL_REG 0x04 +#define DAVINCI_USB_STAT_REG 0x08 +#define DAVINCI_MODE_TGCR_REG 0x10 +#define DAVINCI_AUTOREQ_REG 0x14 +#define DAVINCI_SRP_FIXTIME_REG 0x18 +#define DAVINCI_TEARDOWN_REG 0x1C +#define DAVINCI_USB_INT_SOURCE_REG 0x20 +#define DAVINCI_USB_INT_SET_REG 0x24 +#define DAVINCI_USB_INT_SRC_CLR_REG 0x28 +#define DAVINCI_USB_INT_MASK_REG 0x2c +#define DAVINCI_USB_INT_MASK_SET_REG 0x30 +#define DAVINCI_USB_INT_MASK_CLR_REG 0x34 +#define DAVINCI_USB_INT_SRC_MASKED_REG 0x38 +#define DAVINCI_USB_EOI_REG 0x3c +#define DAVINCI_USB_EOI_INTVEC 0x40 +#define DAVINCI_GRNDIS_EP1SIZE_REG 0x50 +#define DAVINCI_GRNDIS_EP2SIZE_REG 0x54 +#define DAVINCI_GRNDIS_EP3SIZE_REG 0x58 +#define DAVINCI_GRNDIS_EP4SIZE_REG 0x5C + +#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 0x3FFFF + +/* 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__ */ +