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 (file)
--- 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 @@ static struct platform_device kp_device = {
        .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 @@ static void __init htcherald_disable_watchdog(void)
        }
 }
 
+#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 @@ static void __init htcherald_init(void)
        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)

diff --git a/arch/arm/mach-omap1/mux.c b/arch/arm/mach-omap1/mux.c
index 785371e..5e183cd 100644 (file)
--- a/arch/arm/mach-omap1/mux.c
+++ b/arch/arm/mach-omap1/mux.c
@@ -50,7 +50,9 @@ MUX_CFG_7XX("E3_7XX_KBC4",        13,   25,    0,   24,   1, 0)
 
 MUX_CFG_7XX("AA17_7XX_USB_DM",     2,   21,    0,   20,   0, 0)
 MUX_CFG_7XX("W16_7XX_USB_PU_EN",   2,   25,    0,   24,   0, 0)
-MUX_CFG_7XX("W17_7XX_USB_VBUSI",   2,   29,    0,   28,   0, 0)
+MUX_CFG_7XX("W17_7XX_USB_VBUSI",   2,   29,    6,   28,   1, 0)
+MUX_CFG_7XX("W18_7XX_USB_DMCK_OUT",3,    3,    1,    2,   0, 0)
+MUX_CFG_7XX("W19_7XX_USB_DCRST",   3,    7,    1,    6,   0, 0)
 
 /* MMC Pins */
 MUX_CFG_7XX("MMC_7XX_CMD",         2,    9,    0,    8,   1, 0)

diff --git a/arch/arm/plat-omap/include/plat/mux.h b/arch/arm/plat-omap/include/plat/mux.h
index 6067cf7..8ed5f25 100644 (file)
--- a/arch/arm/plat-omap/include/plat/mux.h
+++ b/arch/arm/plat-omap/include/plat/mux.h
@@ -172,6 +172,8 @@ enum omap7xx_index {
        AA17_7XX_USB_DM,
        W16_7XX_USB_PU_EN,
        W17_7XX_USB_VBUSI,
+       W18_7XX_USB_DMCK_OUT,
+       W19_7XX_USB_DCRST,
 
        /* MMC */
        MMC_7XX_CMD,

diff --git a/arch/arm/plat-omap/usb.c b/arch/arm/plat-omap/usb.c
index 51033a4..d3bf17c 100644 (file)
--- a/arch/arm/plat-omap/usb.c
+++ b/arch/arm/plat-omap/usb.c
@@ -137,7 +137,13 @@ static u32 __init omap_usb0_init(unsigned nwires, unsigned is_device)
        if (is_device) {
                if (cpu_is_omap24xx())
                        omap_cfg_reg(J20_24XX_USB0_PUEN);
-               else
+               else if (cpu_is_omap7xx()) {
+                       omap_cfg_reg(AA17_7XX_USB_DM);
+                       omap_cfg_reg(W16_7XX_USB_PU_EN);
+                       omap_cfg_reg(W17_7XX_USB_VBUSI);
+                       omap_cfg_reg(W18_7XX_USB_DMCK_OUT);
+                       omap_cfg_reg(W19_7XX_USB_DCRST);
+               } else
                        omap_cfg_reg(W4_USB_PUEN);
        }