omap1: Add omap7xx USB support
This change implements USB client side support into the HTC
Herald board configuration. It uses a similar, but updated
algorithm to initialize the USB as is used in the linwizard
project.
Signed-off-by: Cory Maccarrone <darkstar6262@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap1/board-htcherald.c b/arch/arm/mach-omap1/board-htcherald.c
index 5f28a5c..e36639f 100644
--- a/arch/arm/mach-omap1/board-htcherald.c
+++ b/arch/arm/mach-omap1/board-htcherald.c
@@ -39,6 +39,7 @@
#include <plat/common.h>
#include <plat/board.h>
#include <plat/keypad.h>
+#include <plat/usb.h>
#include <mach/irqs.h>
@@ -140,6 +141,15 @@
.resource = kp_resources,
};
+/* USB Device */
+static struct omap_usb_config htcherald_usb_config __initdata = {
+ .otg = 0,
+ .register_host = 0,
+ .register_dev = 1,
+ .hmc_mode = 4,
+ .pins[0] = 2,
+};
+
/* LCD Device resources */
static struct platform_device lcd_device = {
.name = "lcd_htcherald",
@@ -214,6 +224,57 @@
}
}
+#define HTCHERALD_GPIO_USB_EN1 33
+#define HTCHERALD_GPIO_USB_EN2 73
+#define HTCHERALD_GPIO_USB_DM 35
+#define HTCHERALD_GPIO_USB_DP 36
+
+static void __init htcherald_usb_enable(void)
+{
+ unsigned int tries = 20;
+ unsigned int value = 0;
+
+ /* Request the GPIOs we need to control here */
+ if (gpio_request(HTCHERALD_GPIO_USB_EN1, "herald_usb") < 0)
+ goto err1;
+
+ if (gpio_request(HTCHERALD_GPIO_USB_EN2, "herald_usb") < 0)
+ goto err2;
+
+ if (gpio_request(HTCHERALD_GPIO_USB_DM, "herald_usb") < 0)
+ goto err3;
+
+ if (gpio_request(HTCHERALD_GPIO_USB_DP, "herald_usb") < 0)
+ goto err4;
+
+ /* force USB_EN GPIO to 0 */
+ do {
+ /* output low */
+ gpio_direction_output(HTCHERALD_GPIO_USB_EN1, 0);
+ } while ((value = gpio_get_value(HTCHERALD_GPIO_USB_EN1)) == 1 &&
+ --tries);
+
+ if (value == 1)
+ printk(KERN_WARNING "Unable to reset USB, trying to continue\n");
+
+ gpio_direction_output(HTCHERALD_GPIO_USB_EN2, 0); /* output low */
+ gpio_direction_input(HTCHERALD_GPIO_USB_DM); /* input */
+ gpio_direction_input(HTCHERALD_GPIO_USB_DP); /* input */
+
+ goto done;
+
+err4:
+ gpio_free(HTCHERALD_GPIO_USB_DM);
+err3:
+ gpio_free(HTCHERALD_GPIO_USB_EN2);
+err2:
+ gpio_free(HTCHERALD_GPIO_USB_EN1);
+err1:
+ printk(KERN_ERR "Unabled to request GPIO for USB\n");
+done:
+ printk(KERN_INFO "USB setup complete.\n");
+}
+
static void __init htcherald_init(void)
{
printk(KERN_INFO "HTC Herald init.\n");
@@ -225,6 +286,9 @@
platform_add_devices(devices, ARRAY_SIZE(devices));
htcherald_disable_watchdog();
+
+ htcherald_usb_enable();
+ omap_usb_init(&htcherald_usb_config);
}
static void __init htcherald_init_irq(void)