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authorLucas Stach <dev@lynxeye.de>2012-08-07 08:19:15 +0000
committerTom Warren <twarren@nvidia.com>2012-09-10 13:01:21 -0700
commit22e73940216ef971c71c49e959519db8babc876a (patch)
treec04c96076328cec881c07a52d521aa5ad7bcb21e /arch/arm
parentcf46cdebdd24b8ecbbf8477d89a7fdff974b3b81 (diff)
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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>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/cpu/armv7/tegra20/usb.c37
1 files changed, 21 insertions, 16 deletions
diff --git a/arch/arm/cpu/armv7/tegra20/usb.c b/arch/arm/cpu/armv7/tegra20/usb.c
index 178bb13..cac0918 100644
--- a/arch/arm/cpu/armv7/tegra20/usb.c
+++ b/arch/arm/cpu/armv7/tegra20/usb.c
@@ -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 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 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,
+ (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");
}
}