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musb: Add Phy programming for using external Vbus 

MUSB PHY on OMAP3EVM Rev >= E uses external Vbus supply to support
500mA of power.We need to program MUSB PHY to use external Vbus
for this purpose.

Adding 'extvbus' member in musb_config structure which should be set
by all the boards where MUSB interface is using external Vbus supply.

Also added ULPI bus control register read/write abstraction for
Blackfin processor as it doesn't have ULPI registers.

CC: Remy Bohmer <linux@bohmer.net>
Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Ajay Kumar Gupta 2010-06-10 11:20:48 +05:30 committed by Remy Bohmer
parent bbf4c01efc
commit 9bb47abf0d
2 changed files with 36 additions and 1 deletions
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7
drivers/usb/musb/musb_core.c
View File

@ -34,6 +34,7 @@ void musb_start(void)
{
#if defined(CONFIG_MUSB_HCD)
u8 devctl;
u8 busctl;
#endif
/* disable all interrupts */
@ -45,6 +46,12 @@ void musb_start(void)
/* put into basic highspeed mode and start session */
writeb(MUSB_POWER_HSENAB, &musbr->power);
#if defined(CONFIG_MUSB_HCD)
/* Program PHY to use EXT VBUS if required */
if (musb_cfg.extvbus == 1) {
busctl = musb_read_ulpi_buscontrol(musbr);
musb_write_ulpi_buscontrol(musbr, busctl | ULPI_USE_EXTVBUS);
}
devctl = readb(&musbr->devctl);
writeb(devctl | MUSB_DEVCTL_SESSION, &musbr->devctl);
#endif

30
drivers/usb/musb/musb_core.h
View File

@ -112,7 +112,10 @@ struct musb_regs {
u16 rxfifoadd;
u32 vcontrol;
u16 hwvers;
u16 reserved2[5];
u16 reserved2a[1];
u8 ulpi_busctl;
u8 reserved2b[1];
u16 reserved2[3];
u8 epinfo;
u8 raminfo;
u8 linkinfo;
@ -181,6 +184,10 @@ struct musb_regs {
#define MUSB_DEVCTL_HR 0x02
#define MUSB_DEVCTL_SESSION 0x01
/* ULPI VBUSCONTROL */
#define ULPI_USE_EXTVBUS 0x01
#define ULPI_USE_EXTVBUSIND 0x02
/* TESTMODE */
#define MUSB_TEST_FORCE_HOST 0x80
#define MUSB_TEST_FIFO_ACCESS 0x40
@ -341,6 +348,7 @@ struct musb_config {
struct musb_regs *regs;
u32 timeout;
u8 musb_speed;
u8 extvbus;
};
/* externally defined data */
@ -361,6 +369,26 @@ extern void read_fifo(u8 ep, u32 length, void *fifo_data);
# define readb(addr) (u8)bfin_read16(addr)
# undef writeb
# define writeb(b, addr) bfin_write16(addr, b)
/*
* The USB PHY on current Blackfin processors is a UTMI+ level 2 PHY.
* However, it has no ULPI support - so there are no registers at all.
* That means accesses to ULPI_BUSCONTROL have to be abstracted away.
*/
static inline u8 musb_read_ulpi_buscontrol(struct musb_regs *musbr)
{
return 0;
}
static inline void musb_write_ulpi_buscontrol(struct musb_regs *musbr, u8 val)
{}
#else
static inline u8 musb_read_ulpi_buscontrol(struct musb_regs *musbr)
{
return readb(&musbr->ulpi_busctl);
}
static inline void musb_write_ulpi_buscontrol(struct musb_regs *musbr, u8 val)
{
writeb(val, &musbr->ulpi_busctl);
}
#endif
#endif /* __MUSB_HDRC_DEFS_H__ */