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usb: musb: make Davinci *work* in mainline 

Now that the musb build fixes for DaVinci got merged (RC3?), kick in
the other bits needed to get it finally *working* in mainline:

 - Use clk_enable()/clk_disable() ... the "always enable USB clocks"
   code this originally relied on has since been removed.

 - Initialize the USB device only after the relevant I2C GPIOs are
   available, so the host side can properly enable VBUS.

 - Tweak init sequencing to cope with mainline's relatively late init
   of the I2C system bus for power switches, transceivers, and so on.

Sanity tested on DM6664 EVM for host and peripheral modes; that system
won't boot with CONFIG_PM enabled, so OTG can't yet be tested.  Also
verified on OMAP3.

(Unrelated:  correct the MODULE_PARM_DESC spelling of musb_debug.)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Felipe Balbi <me@felipebalbi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell 2009-02-20 13:45:17 -08:00 committed by Greg Kroah-Hartman
parent 67f5a4ba97
commit 34f32c9701
5 changed files with 17 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm/mach-davinci/board-evm.c
View File

@ -311,6 +311,9 @@ evm_u35_setup(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
gpio_request(gpio + 7, "nCF_SEL");
gpio_direction_output(gpio + 7, 1);
/* irlml6401 sustains over 3A, switches 5V in under 8 msec */
setup_usb(500, 8);
return 0;
}
@ -417,9 +420,6 @@ static __init void davinci_evm_init(void)
platform_add_devices(davinci_evm_devices,
ARRAY_SIZE(davinci_evm_devices));
evm_init_i2c();
/* irlml6401 sustains over 3A, switches 5V in under 8 msec */
setup_usb(500, 8);
}
static __init void davinci_evm_irq_init(void)

5
arch/arm/mach-davinci/clock.c
View File

@ -230,6 +230,11 @@ static struct clk davinci_clks[] = {
.rate = &commonrate,
.lpsc = DAVINCI_LPSC_GPIO,
},
{
.name = "usb",
.rate = &commonrate,
.lpsc = DAVINCI_LPSC_USB,
},
{
.name = "AEMIFCLK",
.rate = &commonrate,

1
arch/arm/mach-davinci/usb.c
View File

@ -47,6 +47,7 @@ static struct musb_hdrc_platform_data usb_data = {
#elif defined(CONFIG_USB_MUSB_HOST)
.mode = MUSB_HOST,
#endif
.clock = "usb",
.config = &musb_config,
};

15
drivers/usb/musb/davinci.c
View File

@ -377,18 +377,8 @@ int __init musb_platform_init(struct musb *musb)
u32 revision;
musb->mregs += DAVINCI_BASE_OFFSET;
#if 0
/* REVISIT there's something odd about clocking, this
* didn't appear do the job ...
*/
musb->clock = clk_get(pDevice, "usb");
if (IS_ERR(musb->clock))
return PTR_ERR(musb->clock);
status = clk_enable(musb->clock);
if (status < 0)
return -ENODEV;
#endif
clk_enable(musb->clock);
/* returns zero if e.g. not clocked */
revision = musb_readl(tibase, DAVINCI_USB_VERSION_REG);
@ -453,5 +443,8 @@ int musb_platform_exit(struct musb *musb)
}
phy_off();
clk_disable(musb->clock);
return 0;
}

8
drivers/usb/musb/musb_core.c
View File

@ -115,7 +115,7 @@
unsigned musb_debug;
module_param(musb_debug, uint, S_IRUGO | S_IWUSR);
module_param_named(debug, musb_debug, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug message level. Default = 0");
#define DRIVER_AUTHOR "Mentor Graphics, Texas Instruments, Nokia"
@ -2243,10 +2243,10 @@ static int __init musb_init(void)
return platform_driver_probe(&musb_driver, musb_probe);
}
/* make us init after usbcore and before usb
* gadget and host-side drivers start to register
/* make us init after usbcore and i2c (transceivers, regulators, etc)
* and before usb gadget and host-side drivers start to register
*/
subsys_initcall(musb_init);
fs_initcall(musb_init);
static void __exit musb_cleanup(void)
{