diff options
Diffstat (limited to 'drivers/usb/da8xx_usb.c')
| -rw-r--r-- | drivers/usb/da8xx_usb.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/drivers/usb/da8xx_usb.c b/drivers/usb/da8xx_usb.c new file mode 100644 index 0000000000..5dd5f12393 --- /dev/null +++ b/drivers/usb/da8xx_usb.c @@ -0,0 +1,213 @@ +/* + * TI's DA8xx platform specific usb wrapper functions. + * + * Copyright (c) 2004 Texas Instruments + * + * 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. + * + * Author: Thomas Abraham t-abraham@ti.com, Texas Instruments + * + * Copyright (c) 2003 Wolfgang Denk, wd@denx.de + * + */ + +#include <common.h> + +#ifdef CONFIG_USB_DA8XX + +#include "da8xx_usb.h" + +/* extern functions */ +extern void lpsc_on(unsigned int id); + +/* Timeout for DA8xx usb module */ +#define DA8XX_USB_TIMEOUT 0x3FFFF + + +/* This function writes to a 32-bit register of platform usb wrapper */ +inline void pusb_writel( u32 offset , u32 value ) +{ + *(volatile u32*)(DA8XX_USB0_BASE+offset) = value; +} + +/* This function reads a 32-bit register of platform usb wrapper */ +inline u32 pusb_readl(u32 offset) +{ + return(*(volatile u32*)(DA8XX_USB0_BASE+offset)); +} + +/* This function writes to a 16-bit register of platform musb core */ +inline void musb_writew(u32 offset, u16 value) +{ + *(volatile u16*)(MENTOR_USB0_BASE+offset) = value; +} + +/* This function writes to a 8-bit register of platform musb core */ +inline void musb_writeb(u32 offset, u8 value) +{ + *(volatile u8*)(MENTOR_USB0_BASE+offset) = value; +} + +/* This function reads a 16-bit register of platform usb wrapper */ +inline u16 musb_readw(u32 offset) +{ + return(*(volatile u16*)(MENTOR_USB0_BASE + offset)); +} + +/* This function reads a 8-bit register of platform usb wrapper */ +inline u8 musb_readb(u32 offset) +{ + return(*(volatile u8*)(MENTOR_USB0_BASE+offset)); +} + +/* + * 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 = *(volatile u32 *)GPIO_BANK4_REG_DIR_ADDR; + value &= ~0x8000; + *(volatile u32 *)GPIO_BANK4_REG_DIR_ADDR = value; + + /* set GPIO bank4 pin 15 high to drive VBUS */ + value = *(volatile u32 *)GPIO_BANK4_REG_SET_ADDR; + value |= 0x8000; + *(volatile u32 *)GPIO_BANK4_REG_SET_ADDR = value; +} + +/* + * Enable the usb0 phy. This initialization procedure is explained in + * the DA8xx USB user guide document. + */ +static u8 phy_on( void ) +{ + u32 timeout; + u8 result = 1; + + /* write access keys */ + *(volatile u32 *)(KICK0) = 0x83e70b13; + *(volatile u32 *)(KICK1) = 0x95a4f1e0; + + +#ifdef CONFIG_USE_PINMUX + + /* set PINMUX[7:4] = 1 */ + *(volatile u32 *)(PINMUX9) |= ( 1 << 4 ); + *(volatile u32 *)(PINMUX9) &= 0xFFFFFF7F; + +#endif + + /* reset the usb controller */ + pusb_writel( DA8XX_USB_CTRL_REG , 0x1 ); + udelay( 5000 ); + + /* enable and then disable the usb phy reset */ + *(volatile u32*)CFGCHIP2 |= 0x00008000; + udelay( 5000 ); + *(volatile u32*)CFGCHIP2 &= 0xFFFF7FFF; + udelay( 5000 ); + + /* configure phy (refer to da8xx usb user guide use case section) */ + *(volatile u32*)CFGCHIP2 &= 0xFFFF9FFF; + *(volatile u32*)CFGCHIP2 &= 0xFFFFFBFF; + *(volatile u32*)CFGCHIP2 &= 0xFFFFFDFF; + *(volatile u32*)CFGCHIP2 |= 0x00000100; + *(volatile u32*)CFGCHIP2 |= 0x00000020; + *(volatile u32*)CFGCHIP2 |= 0x00000010; + *(volatile u32*)CFGCHIP2 |= 0x00000002; + *(volatile u32*)CFGCHIP2 &= 0xFFFFE7FF; + *(volatile u32*)CFGCHIP2 |= 0x00000800; + + *(volatile u32*)CFGCHIP2 &= 0xFFFF9FFF; + *(volatile u32*)CFGCHIP2 |= 0x00002000; + *(volatile u32*)CFGCHIP2 |= 0x00000040; + + /* wait until the usb phy pll locks */ + timeout = DA8XX_USB_TIMEOUT; + do { + timeout--; + if (timeout == 0) + break; + } + while(((*(volatile u32*)CFGCHIP2) & 0x00020000) == 0); + + /* disable register access by writing invalid keys */ + *(volatile u32 *)(0x01C14038) = 0x0; + *(volatile u32 *)(0x01C1403C) = 0x0; + + if (timeout == 0) + result = 0; + + return(result); +} + +/* + * Disable the usb phy + */ +static void phy_off(void) +{ + /* write access keys */ + *(volatile u32 *)(KICK0) = 0; + *(volatile u32 *)(KICK1) = 0; + + /* powerdown the on-chip PHY and its oscillator */ + *(volatile u32*)(CFGCHIP2) = 0x8600; +} + + +/* + * 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(); + + /* start the on-chip usb phy and its pll */ + if (phy_on() == 0) + return(-1); + + /* reset the controller */ + pusb_writel(DA8XX_USB_CTRL_REG, 0x1); + udelay(5000); + + /* Returns zero if e.g. not clocked */ + revision = pusb_readl(DA8XX_USB_VERSION_REG); + if (revision == 0) + return(-1); + + /* Disable all interrupts */ + pusb_writel(DA8XX_USB_INT_MASK_SET_REG, 0x01FF1F1F); + 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 */ + pusb_writel(DA8XX_USB_INT_MASK_CLR_REG, DA8XX_USB_USBINT_MASK|DA8XX_USB_TXINT_MASK|DA8XX_USB_RXINT_MASK); + pusb_writel(DA8XX_USB_EOI_REG, 0); +} + +#endif /* CONFIG_USB_DA8XX */ + |