[PATCH 4/6] ARM: freescale-mx51-babbage: Add USBH1 PHY reset sequence

[Andrey Smirnov <andrew.smirnov@gmail.com>]

UPLI PHY connected to USBH1 on Babbage board seem to need a special
reset sequence in which STP signal gets asserted for a short period of
time. Without this sequnce running "usb" results in timeout and no USB
devices found.

Similar reset sequences can be found in Babbage board code in U-Boot
as well as efikamx_usb_init() in Barebox.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 .../arm/boards/freescale-mx51-babbage/board.c | 35 +++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/arch/arm/boards/freescale-mx51-babbage/board.c b/arch/arm/boards/freescale-mx51-babbage/board.c
index 2e75db547..4839aa568 100644
--- a/arch/arm/boards/freescale-mx51-babbage/board.c
+++ b/arch/arm/boards/freescale-mx51-babbage/board.c
@@ -43,6 +43,41 @@
 
 #define MX51_CCM_CACRR 0x10
 
+#define USBH1_STP	IMX_GPIO_NR(1, 27)
+#define USBH1_PHY_RESET IMX_GPIO_NR(2, 5)
+#define USBH1_HUB_RESET	IMX_GPIO_NR(1, 7)
+
+static int imx51_babbage_reset_usbh1(void)
+{
+	void __iomem *iomuxbase = IOMEM(MX51_IOMUXC_BASE_ADDR);
+
+	if (!of_machine_is_compatible("fsl,imx51-babbage"))
+		return 0;
+
+	imx_setup_pad(iomuxbase, MX51_PAD_EIM_D21__GPIO2_5);
+	imx_setup_pad(iomuxbase, MX51_PAD_GPIO1_7__GPIO1_7);
+
+	gpio_direction_output(USBH1_PHY_RESET, 0);
+	gpio_direction_output(USBH1_HUB_RESET, 0);
+
+	mdelay(10);
+
+	gpio_set_value(USBH1_PHY_RESET, 1);
+	gpio_set_value(USBH1_HUB_RESET, 1);
+
+	imx_setup_pad(iomuxbase, MX51_PAD_USBH1_STP__GPIO1_27);
+	gpio_direction_output(USBH1_STP, 1);
+
+	mdelay(1);
+
+	imx_setup_pad(iomuxbase, MX51_PAD_USBH1_STP__USBH1_STP);
+
+	gpio_free(USBH1_PHY_RESET);
+
+	return 0;
+}
+console_initcall(imx51_babbage_reset_usbh1);
+
 static int imx51_babbage_init(void)
 {
 	if (!of_machine_is_compatible("fsl,imx51-babbage"))
-- 
2.17.1


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