Prev: [PATCHv4 2.6.34-rc4 7/7] mx5: Add USB to Freescale MX51 defconfig
Next: [regression] Sound not transferred to docking station after resume from StR
From: Dinh.Nguyen on 16 Apr 2010 15:20
From: Dinh Nguyen <Dinh.Nguyen(a)freescale.com>

This patch enables USB host functionality for Host1 and OTG port on
Freescale MX51 Babbage HW. This patch contains the board specific
HW initialization of the USB HW.

This patch applies to 2.6.34-rc4.

Signed-off-by: Dinh Nguyen <Dinh.Nguyen(a)freescale.com>
---
arch/arm/mach-mx5/board-mx51_babbage.c | 81 ++++++++++++++++++++++++++++++++
1 files changed, 81 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-mx5/board-mx51_babbage.c b/arch/arm/mach-mx5/board-mx51_babbage.c
index ee67a71..617f4e2 100644
--- a/arch/arm/mach-mx5/board-mx51_babbage.c
+++ b/arch/arm/mach-mx5/board-mx51_babbage.c
@@ -12,11 +12,14 @@

#include <linux/init.h>
#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>

#include <mach/common.h>
#include <mach/hardware.h>
#include <mach/imx-uart.h>
#include <mach/iomux-mx51.h>
+#include <mach/mxc_ehci.h>

#include <asm/irq.h>
#include <asm/setup.h>
@@ -26,6 +29,9 @@

#include "devices.h"

+#define BABBAGE_USB_HUB_RESET (0*32 + 7) /* GPIO_1_7 */
+#define BABBAGE_USBH1_STP (0*32 + 27) /* GPIO_1_27 */
+
static struct platform_device *devices[] __initdata = {
&mxc_fec_device,
};
@@ -46,6 +52,22 @@ static struct pad_desc mx51babbage_pads[] = {
MX51_PAD_EIM_D26__UART3_TXD,
MX51_PAD_EIM_D27__UART3_RTS,
MX51_PAD_EIM_D24__UART3_CTS,
+
+ /* USB HOST1 */
+ MX51_PAD_USBH1_CLK__USBH1_CLK,
+ MX51_PAD_USBH1_DIR__USBH1_DIR,
+ MX51_PAD_USBH1_NXT__USBH1_NXT,
+ MX51_PAD_USBH1_DATA0__USBH1_DATA0,
+ MX51_PAD_USBH1_DATA1__USBH1_DATA1,
+ MX51_PAD_USBH1_DATA2__USBH1_DATA2,
+ MX51_PAD_USBH1_DATA3__USBH1_DATA3,
+ MX51_PAD_USBH1_DATA4__USBH1_DATA4,
+ MX51_PAD_USBH1_DATA5__USBH1_DATA5,
+ MX51_PAD_USBH1_DATA6__USBH1_DATA6,
+ MX51_PAD_USBH1_DATA7__USBH1_DATA7,
+
+ /* USB HUB reset line*/
+ MX51_PAD_GPIO_1_7__GPIO1_7,
};

/* Serial ports */
@@ -66,15 +88,74 @@ static inline void mxc_init_imx_uart(void)
}
#endif /* SERIAL_IMX */

+static int gpio_usbh1_active(void)
+{
+ struct pad_desc usbh1stp_gpio = MX51_PAD_USBH1_STP__GPIO_1_27;
+ int ret;
+
+ /* Set USBH1_STP to GPIO and toggle it */
+ mxc_iomux_v3_setup_pad(&usbh1stp_gpio);
+ ret = gpio_request(BABBAGE_USBH1_STP, "usbh1_stp");
+
+ if (ret) {
+ pr_debug("failed to get MX51_PAD_USBH1_STP__GPIO_1_27: %d\n", ret);
+ return ret;
+ }
+ gpio_direction_output(BABBAGE_USBH1_STP, 0);
+ gpio_set_value(BABBAGE_USBH1_STP, 1);
+ msleep(100);
+ gpio_free(BABBAGE_USBH1_STP);
+ return 0;
+}
+
+static inline void babbage_usbhub_reset(void)
+{
+ int ret;
+
+ /* Bring USB hub out of reset */
+ ret = gpio_request(BABBAGE_USB_HUB_RESET, "GPIO1_7");
+ if (ret) {
+ printk(KERN_ERR"failed to get GPIO_USB_HUB_RESET: %d\n", ret);
+ return;
+ }
+ gpio_direction_output(BABBAGE_USB_HUB_RESET, 0);
+
+ /* USB HUB RESET - De-assert USB HUB RESET_N */
+ msleep(1);
+ gpio_set_value(BABBAGE_USB_HUB_RESET, 0);
+ msleep(1);
+ gpio_set_value(BABBAGE_USB_HUB_RESET, 1);
+}
+
+static struct mxc_usbh_platform_data dr_utmi_config = {
+ .portsc = MXC_EHCI_UTMI_16BIT,
+ .flags = MXC_EHCI_INTERNAL_PHY,
+};
+
+static struct mxc_usbh_platform_data usbh1_config = {
+ .portsc = MXC_EHCI_MODE_ULPI,
+ .flags = MXC_EHCI_POWER_PINS_ENABLED,
+};
+
/*
* Board specific initialization.
*/
static void __init mxc_board_init(void)
{
+ struct pad_desc usbh1stp = MX51_PAD_USBH1_STP__USBH1_STP;
+
mxc_iomux_v3_setup_multiple_pads(mx51babbage_pads,
ARRAY_SIZE(mx51babbage_pads));
mxc_init_imx_uart();
platform_add_devices(devices, ARRAY_SIZE(devices));
+
+ mxc_register_device(&mxc_usbdr_host_device, &dr_utmi_config);
+
+ gpio_usbh1_active();
+ mxc_register_device(&mxc_usbh1_device, &usbh1_config);
+ /* setback USBH1_STP to be function */
+ mxc_iomux_v3_setup_pad(&usbh1stp);
+ babbage_usbhub_reset();
}

static void __init mx51_babbage_timer_init(void)
--
1.6.0.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
 | 
Pages: 1
Prev: [PATCHv4 2.6.34-rc4 7/7] mx5: Add USB to Freescale MX51 defconfig
Next: [regression] Sound not transferred to docking station after resume from StR