[PATCH 2.6.34-rc4 6/8] mx5: Add USB support for Freescale MX51 Babbage

Dinh.Nguyen at freescale.com Dinh.Nguyen at freescale.com
Tue Apr 13 12:10:29 EDT 2010


From: Dinh Nguyen <Dinh.Nguyen at freescale.com>

This patch updates the clocks, gpios, iomuxing and device structures for
enabling USB Host functionality on Freescale MX51 Babbage HW.
This patch applies to 2.6.34-rc4.

Signed-off-by: Dinh Nguyen <Dinh.Nguyen at freescale.com>
---
 arch/arm/mach-mx5/board-mx51_babbage.c |   40 +++++++++++++++++++++++++-
 arch/arm/mach-mx5/clock-mx51.c         |    8 +++++
 arch/arm/mach-mx5/devices.c            |   49 ++++++++++++++++++++++++++++++++
 arch/arm/mach-mx5/devices.h            |    2 +
 4 files changed, 98 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-mx5/board-mx51_babbage.c b/arch/arm/mach-mx5/board-mx51_babbage.c
index 1338d6a..ddfa48b 100644
--- a/arch/arm/mach-mx5/board-mx51_babbage.c
+++ b/arch/arm/mach-mx5/board-mx51_babbage.c
@@ -13,6 +13,7 @@
 #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>
@@ -30,6 +31,8 @@
 extern void __init mx5_usb_dr_init(void);
 extern void __init mx5_usbh1_init(void);
 
+#define GPIO_1_7  (0*32+7)
+
 static struct platform_device *devices[] __initdata = {
 	&mxc_fec_device,
 };
@@ -50,6 +53,22 @@ 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_GPIO_1_25__USBH1_CLK,
+	MX51_PAD_GPIO_1_26__USBH1_DIR,
+	MX51_PAD_GPIO_1_28__USBH1_NXT,
+	MX51_PAD_GPIO_1_11__USBH1_DATA0,
+	MX51_PAD_GPIO_1_12__USBH1_DATA1,
+	MX51_PAD_GPIO_1_13__USBH1_DATA2,
+	MX51_PAD_GPIO_1_14__USBH1_DATA3,
+	MX51_PAD_GPIO_1_15__USBH1_DATA4,
+	MX51_PAD_GPIO_1_16__USBH1_DATA5,
+	MX51_PAD_GPIO_1_17__USBH1_DATA6,
+	MX51_PAD_GPIO_1_18__USBH1_DATA7,
+
+	/* USB HUB reset line*/
+	MX51_PAD_GPIO_1_7__GPIO1_7,
 };
 
 /* Serial ports */
@@ -64,12 +83,31 @@ static inline void mxc_init_imx_uart(void)
 	mxc_register_device(&mxc_uart_device1, &uart_pdata);
 	mxc_register_device(&mxc_uart_device2, &uart_pdata);
 }
-#else /* !SERIAL_IMX */
+#else /* SERIAL_IMX */
 static inline void mxc_init_imx_uart(void)
 {
 }
 #endif /* SERIAL_IMX */
 
+static inline void mx5_babbage_usbhub_reset(void)
+{
+	int ret;
+
+	/* Bring USB hub out of reset */
+	ret = gpio_request(GPIO_1_7, "GPIO1_7");
+	if (ret) {
+		printk("failed to get GPIO_1_7: %d\n", ret);
+		return;
+	}
+	gpio_direction_output(GPIO_1_7, 0);
+
+	/* USB HUB RESET - De-assert USB HUB RESET_N */
+	msleep(1);
+	gpio_set_value(GPIO_1_7, 0);
+	msleep(1);
+	gpio_set_value(GPIO_1_7, 1);
+}
+
 /*
  * Board specific initialization.
  */
diff --git a/arch/arm/mach-mx5/clock-mx51.c b/arch/arm/mach-mx5/clock-mx51.c
index 8f85f73..36684d0 100644
--- a/arch/arm/mach-mx5/clock-mx51.c
+++ b/arch/arm/mach-mx5/clock-mx51.c
@@ -765,6 +765,10 @@ DEFINE_CLOCK(gpt_ipg_clk, 0, MXC_CCM_CCGR2, MXC_CCM_CCGRx_CG10_OFFSET,
 DEFINE_CLOCK(fec_clk, 0, MXC_CCM_CCGR2, MXC_CCM_CCGRx_CG12_OFFSET,
 	NULL,  NULL, &ipg_clk, NULL);
 
+/* USB */
+DEFINE_CLOCK(usboh3_clk, 0, MXC_CCM_CCGR2, MXC_CCM_CCGRx_CG14_OFFSET,
+	NULL,  NULL, &pll3_sw_clk, NULL);
+
 #define _REGISTER_CLOCK(d, n, c) \
        { \
 		.dev_id = d, \
@@ -778,6 +782,10 @@ static struct clk_lookup lookups[] = {
 	_REGISTER_CLOCK("imx-uart.2", NULL, uart3_clk)
 	_REGISTER_CLOCK(NULL, "gpt", gpt_clk)
 	_REGISTER_CLOCK("fec.0", NULL, fec_clk)
+	_REGISTER_CLOCK("mxc-ehci.0", "usb", usboh3_clk)
+	_REGISTER_CLOCK("mxc-ehci.0", "usb_ahb", ahb_clk)
+	_REGISTER_CLOCK("mxc-ehci.1", "usb", usboh3_clk)
+	_REGISTER_CLOCK("mxc-ehci.1", "usb_ahb", ahb_clk)
 };
 
 static void clk_tree_init(void)
diff --git a/arch/arm/mach-mx5/devices.c b/arch/arm/mach-mx5/devices.c
index 73f2342..3d8f66a 100644
--- a/arch/arm/mach-mx5/devices.c
+++ b/arch/arm/mach-mx5/devices.c
@@ -11,6 +11,7 @@
  */
 
 #include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
 #include <mach/hardware.h>
 #include <mach/gpio.h>
 #include <mach/imx-uart.h>
@@ -92,6 +93,54 @@ struct platform_device mxc_fec_device = {
 	.resource = mxc_fec_resources,
 };
 
+static u64 usb_dma_mask = DMA_BIT_MASK(32);
+
+static struct resource usbotg_resources[] = {
+	{
+		.start = MX51_OTG_BASE_ADDR,
+		.end = MX51_OTG_BASE_ADDR + 0x1ff,
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.start = MX51_MXC_INT_USB_OTG,
+		.flags = IORESOURCE_IRQ,
+	},
+};
+
+struct platform_device mxc_usbdr_host_device = {
+	.name = "mxc-ehci",
+	.id = 0,
+	.num_resources = ARRAY_SIZE(usbotg_resources),
+	.resource = usbotg_resources,
+	.dev = {
+		.dma_mask = &usb_dma_mask,
+		.coherent_dma_mask = DMA_BIT_MASK(32),
+	},
+};
+
+static struct resource usbh1_resources[] = {
+	{
+		.start = MX51_OTG_BASE_ADDR + 0x200,
+		.end = MX51_OTG_BASE_ADDR + 0x200 + 0x1ff,
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.start = MX51_MXC_INT_USB_H1,
+		.flags = IORESOURCE_IRQ,
+	},
+};
+
+struct platform_device mxc_usbh1_device = {
+	.name = "mxc-ehci",
+	.id = 1,
+	.num_resources = ARRAY_SIZE(usbh1_resources),
+	.resource = usbh1_resources,
+	.dev = {
+		.dma_mask = &usb_dma_mask,
+		.coherent_dma_mask = DMA_BIT_MASK(32),
+	},
+};
+
 struct mxc_gpio_port mxc_gpio_ports[] = {
 	{
 		.chip.label = "gpio-0",
diff --git a/arch/arm/mach-mx5/devices.h b/arch/arm/mach-mx5/devices.h
index f339ab8..95c45f9 100644
--- a/arch/arm/mach-mx5/devices.h
+++ b/arch/arm/mach-mx5/devices.h
@@ -2,3 +2,5 @@ extern struct platform_device mxc_uart_device0;
 extern struct platform_device mxc_uart_device1;
 extern struct platform_device mxc_uart_device2;
 extern struct platform_device mxc_fec_device;
+extern struct platform_device mxc_usbdr_host_device;
+extern struct platform_device mxc_usbh1_device;
-- 
1.6.0.4




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