linux-kernel - [Patch v4] AM35xx: Craneboard: Add USB EHCI support

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Date:	Thu, 16 Dec 2010 20:55:12 +0530
From:	srinath@...tralsolutions.com
To:	linux-omap@...r.kernel.org
Cc:	jdk@...com, tony@...mide.com, linux-kernel@...r.kernel.org,
	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	khilman@...prootsystems.com, nm@...com,
	nagendra@...tralsolutions.com, umeshk@...tralsolutions.com,
	sshtylyov@...sta.com, manjugk@...com,
	Srinath <srinath@...tralsolutions.com>
Subject: [Patch v4] AM35xx: Craneboard: Add USB EHCI support

From: Srinath <srinath@...tralsolutions.com>

AM3517/05 Craneboard has one EHCI interface on board using port1.

GPIO35 is used as power enable.
GPIO38 is used as port1 PHY reset.

History:
http://marc.info/?l=linux-omap&w=2&r=1&s=Craneboard%3A+Add+USB+EHCI+support&q=t

Signed-off-by: Srinath <srinath@...tralsolutions.com>
---
 arch/arm/mach-omap2/board-am3517crane.c |   53 +++++++++++++++++++++++++++++++
 1 files changed, 53 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-omap2/board-am3517crane.c b/arch/arm/mach-omap2/board-am3517crane.c
index 8ba4047..1a80175 100644
--- a/arch/arm/mach-omap2/board-am3517crane.c
+++ b/arch/arm/mach-omap2/board-am3517crane.c
@@ -19,6 +19,7 @@
 
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/gpio.h>
 
 #include <mach/hardware.h>
 #include <asm/mach-types.h>
@@ -27,8 +28,14 @@
 
 #include <plat/board.h>
 #include <plat/common.h>
+#include <plat/usb.h>
 
 #include "mux.h"
+#include "control.h"
+
+#define GPIO_USB_POWER		35
+#define GPIO_USB_NRESET		38
+
 
 /* Board initialization */
 static struct omap_board_config_kernel am3517_crane_config[] __initdata = {
@@ -51,10 +58,56 @@ static void __init am3517_crane_init_irq(void)
 	omap_init_irq();
 }
 
+static struct ehci_hcd_omap_platform_data ehci_pdata __initdata = {
+	.port_mode[0] = EHCI_HCD_OMAP_MODE_PHY,
+	.port_mode[1] = EHCI_HCD_OMAP_MODE_UNKNOWN,
+	.port_mode[2] = EHCI_HCD_OMAP_MODE_UNKNOWN,
+
+	.phy_reset  = true,
+	.reset_gpio_port[0]  = GPIO_USB_NRESET,
+	.reset_gpio_port[1]  = -EINVAL,
+	.reset_gpio_port[2]  = -EINVAL
+};
+
 static void __init am3517_crane_init(void)
 {
+	int ret;
+
 	omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
 	omap_serial_init();
+
+	/* Configure GPIO for EHCI port */
+	if (omap_mux_init_gpio(GPIO_USB_NRESET, OMAP_PIN_OUTPUT)) {
+		pr_err("Can not cofigure mux for GPIO_USB_NRESET %d\n",
+			GPIO_USB_NRESET);
+		return;
+	}
+
+	if (omap_mux_init_gpio(GPIO_USB_POWER, OMAP_PIN_OUTPUT)) {
+		pr_err("Can not cofigure mux for GPIO_USB_POWER %d\n",
+
+			GPIO_USB_POWER);
+		return;
+	}
+
+	ret = gpio_request(GPIO_USB_POWER, "usb_ehci_enable");
+	if (ret < 0) {
+		pr_err("Cannot request GPIO %d\n", GPIO_USB_POWER);
+		return;
+	}
+
+	ret = gpio_direction_output(GPIO_USB_POWER, 1);
+	if (ret < 0)
+		goto err;
+
+
+	usb_ehci_init(&ehci_pdata);
+	return;
+
+err:
+	gpio_free(GPIO_USB_POWER);
+	pr_err("Unable to initialize EHCI power\n");
+	return;
 }
 
 MACHINE_START(CRANEBOARD, "AM3517/05 CRANEBOARD")
-- 
1.7.1.226.g770c5

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