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tegra20: usb: rework set_host_mode 

This allows for two things:
- VBus GPIO may be used on other ports than the OTG one
- VBus GPIO may be low active if specified by DT

Signed-off-by: Lucas Stach <dev@lynxeye.de>
CC: Stephen Warren <swarren@wwwdotorg.org>
CC: Tom Warren <TWarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Lucas Stach 2012-08-07 08:19:15 +00:00 committed by Tom Warren
parent cf46cdebdd
commit 22e7394021
1 changed files with 20 additions and 15 deletions
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35
arch/arm/cpu/armv7/tegra20/usb.c
View File

@ -137,24 +137,29 @@ static const u8 utmip_elastic_limit = 16;
/* UTMIP High Speed Sync Start Delay */
static const u8 utmip_hs_sync_start_delay = 9;
/* Put the port into host mode (this only works for OTG ports) */
/* Put the port into host mode */
static void set_host_mode(struct fdt_usb *config)
{
if (config->dr_mode == DR_MODE_OTG) {
/* Check whether remote host from USB1 is driving VBus */
if (readl(&config->reg->phy_vbus_sensors) & VBUS_VLD_STS)
return;
/*
* If we are an OTG port, check if remote host is driving VBus and
* bail out in this case.
*/
if (config->dr_mode == DR_MODE_OTG &&
(readl(&config->reg->phy_vbus_sensors) & VBUS_VLD_STS))
return;
/*
* If not driving, we set the GPIO to enable VBUS. We assume
* that the pinmux is set up correctly for this.
*/
if (fdt_gpio_isvalid(&config->vbus_gpio)) {
fdtdec_setup_gpio(&config->vbus_gpio);
gpio_direction_output(config->vbus_gpio.gpio, 1);
debug("set_host_mode: GPIO %d high\n",
config->vbus_gpio.gpio);
}
/*
* If not driving, we set the GPIO to enable VBUS. We assume
* that the pinmux is set up correctly for this.
*/
if (fdt_gpio_isvalid(&config->vbus_gpio)) {
fdtdec_setup_gpio(&config->vbus_gpio);
gpio_direction_output(config->vbus_gpio.gpio,
(config->vbus_gpio.flags & FDT_GPIO_ACTIVE_LOW) ?
0 : 1);
debug("set_host_mode: GPIO %d %s\n", config->vbus_gpio.gpio,
(config->vbus_gpio.flags & FDT_GPIO_ACTIVE_LOW) ?
"low" : "high");
}
}