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usb: musb: ux500: implement musb_set_vbus 

Add ux500_musb_set_vbus() implementation for ux500.

This is based on the version originally developed inside ST-Ericsson.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>

[ balbi@ti.com: fix a build error due to
	missing otg_state_string() ]

Signed-off-by: Felipe Balbi <balbi@ti.com>
hifive-unleashed-5.1
Fabio Baltieri 2013-03-08 10:27:06 +08:00 committed by Felipe Balbi
parent 399e0f4f00
commit 996a9d26d3
1 changed files with 64 additions and 0 deletions
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64
drivers/usb/musb/ux500.c
View File

@ -36,6 +36,68 @@ struct ux500_glue {
};
#define glue_to_musb(g) platform_get_drvdata(g->musb)
static void ux500_musb_set_vbus(struct musb *musb, int is_on)
{
u8 devctl;
unsigned long timeout = jiffies + msecs_to_jiffies(1000);
/* HDRC controls CPEN, but beware current surges during device
* connect. They can trigger transient overcurrent conditions
* that must be ignored.
*/
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
if (is_on) {
if (musb->xceiv->state == OTG_STATE_A_IDLE) {
/* start the session */
devctl |= MUSB_DEVCTL_SESSION;
musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
/*
* Wait for the musb to set as A device to enable the
* VBUS
*/
while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
if (time_after(jiffies, timeout)) {
dev_err(musb->controller,
"configured as A device timeout");
break;
}
}
} else {
musb->is_active = 1;
musb->xceiv->otg->default_a = 1;
musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
devctl |= MUSB_DEVCTL_SESSION;
MUSB_HST_MODE(musb);
}
} else {
musb->is_active = 0;
/* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping
* right to B_IDLE...
*/
musb->xceiv->otg->default_a = 0;
devctl &= ~MUSB_DEVCTL_SESSION;
MUSB_DEV_MODE(musb);
}
musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
/*
* Devctl values will be updated after vbus goes below
* session_valid. The time taken depends on the capacitance
* on VBUS line. The max discharge time can be upto 1 sec
* as per the spec. Typically on our platform, it is 200ms
*/
if (!is_on)
mdelay(200);
dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
usb_otg_state_string(musb->xceiv->state),
musb_readb(musb->mregs, MUSB_DEVCTL));
}
static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
{
unsigned long flags;
@ -79,6 +141,8 @@ static int ux500_musb_exit(struct musb *musb)
static const struct musb_platform_ops ux500_ops = {
.init = ux500_musb_init,
.exit = ux500_musb_exit,
.set_vbus = ux500_musb_set_vbus,
};
static int ux500_probe(struct platform_device *pdev)