[ARM] pxa/em-x270: add support for on-board USB Hub

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Eric Miao <eric.miao@marvell.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/em-x270.c b/arch/arm/mach-pxa/em-x270.c
index 35a12038dc0b..3ff1fec017fd 100644
--- a/arch/arm/mach-pxa/em-x270.c
+++ b/arch/arm/mach-pxa/em-x270.c
@@ -55,6 +55,7 @@
 #define GPIO95_MMC_WP           (95)
 #define GPIO56_NAND_RB          (56)
 #define GPIO93_CAM_RESET        (93)
+#define GPIO16_USB_HUB_RESET    (16)
 
 /* eXeda specific GPIOs */
 #define GPIO114_MMC_CD          (114)
@@ -63,6 +64,7 @@
 #define GPIO37_WLAN_RST         (37)
 #define GPIO95_TOUCHPAD_INT     (95)
 #define GPIO130_CAM_RESET       (130)
+#define GPIO10_USB_HUB_RESET    (10)
 
 /* common  GPIOs */
 #define GPIO11_NAND_CS          (11)
@@ -70,11 +72,13 @@
 #define EM_X270_ETHIRQ          IRQ_GPIO(GPIO41_ETHIRQ)
 #define GPIO115_WLAN_PWEN       (115)
 #define GPIO19_WLAN_STRAP       (19)
+#define GPIO9_USB_VBUS_EN       (9)
 
 static int mmc_cd;
 static int nand_rb;
 static int dm9000_flags;
 static int cam_reset;
+static int usb_hub_reset;
 
 static unsigned long common_pin_config[] = {
         /* AC'97 */
@@ -197,12 +201,14 @@ static unsigned long common_pin_config[] = {
 
 static unsigned long em_x270_pin_config[] = {
         GPIO13_GPIO,                            /* MMC card detect */
+        GPIO16_GPIO,                            /* USB hub reset */
         GPIO56_GPIO,                            /* NAND Ready/Busy */
         GPIO93_GPIO     | MFP_LPM_DRIVE_LOW,    /* Camera reset */
         GPIO95_GPIO,                            /* MMC Write protect */
 };
 
 static unsigned long exeda_pin_config[] = {
+        GPIO10_GPIO,                            /* USB hub reset */
         GPIO20_GPIO,                            /* NAND Ready/Busy */
         GPIO38_GPIO     | MFP_LPM_DRIVE_LOW,    /* SD slot power */
         GPIO95_GPIO,                            /* touchpad IRQ */
@@ -471,18 +477,79 @@ static inline void em_x270_init_nor(void) {}
 
 /* PXA27x OHCI controller setup */
 #if defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
+static struct regulator *em_x270_usb_ldo;
+
+static int em_x270_usb_hub_init(void)
+{
+        int err;
+
+        em_x270_usb_ldo = regulator_get(NULL, "vcc usb");
+        if (IS_ERR(em_x270_usb_ldo))
+                return PTR_ERR(em_x270_usb_ldo);
+
+        err = gpio_request(GPIO9_USB_VBUS_EN, "vbus en");
+        if (err)
+                goto err_free_usb_ldo;
+
+        err = gpio_request(usb_hub_reset, "hub rst");
+        if (err)
+                goto err_free_vbus_gpio;
+
+        /* USB Hub power-on and reset */
+        gpio_direction_output(usb_hub_reset, 0);
+        regulator_enable(em_x270_usb_ldo);
+        gpio_set_value(usb_hub_reset, 1);
+        gpio_set_value(usb_hub_reset, 0);
+        regulator_disable(em_x270_usb_ldo);
+        regulator_enable(em_x270_usb_ldo);
+        gpio_set_value(usb_hub_reset, 1);
+
+        /* enable VBUS */
+        gpio_direction_output(GPIO9_USB_VBUS_EN, 1);
+
+        return 0;
+
+err_free_vbus_gpio:
+        gpio_free(GPIO9_USB_VBUS_EN);
+err_free_usb_ldo:
+        regulator_put(em_x270_usb_ldo);
+
+        return err;
+}
+
 static int em_x270_ohci_init(struct device *dev)
 {
+        int err;
+
+        /* we don't want to entirely disable USB if the HUB init failed */
+        err = em_x270_usb_hub_init();
+        if (err)
+                pr_err("USB Hub initialization failed: %d\n", err);
+
         /* enable port 2 transiever */
         UP2OCR = UP2OCR_HXS | UP2OCR_HXOE;
 
         return 0;
 }
 
+static void em_x270_ohci_exit(struct device *dev)
+{
+        gpio_free(usb_hub_reset);
+        gpio_free(GPIO9_USB_VBUS_EN);
+
+        if (!IS_ERR(em_x270_usb_ldo)) {
+                if (regulator_is_enabled(em_x270_usb_ldo))
+                        regulator_disable(em_x270_usb_ldo);
+
+                regulator_put(em_x270_usb_ldo);
+        }
+}
+
 static struct pxaohci_platform_data em_x270_ohci_platform_data = {
         .port_mode      = PMM_PERPORT_MODE,
         .flags          = ENABLE_PORT1 | ENABLE_PORT2 | POWER_CONTROL_LOW,
         .init           = em_x270_ohci_init,
+        .exit           = em_x270_ohci_exit,
 };
 
 static void __init em_x270_init_ohci(void)
@@ -1129,6 +1196,7 @@ static void __init em_x270_module_init(void)
         nand_rb = GPIO56_NAND_RB;
         dm9000_flags = DM9000_PLATF_32BITONLY;
         cam_reset = GPIO93_CAM_RESET;
+        usb_hub_reset = GPIO16_USB_HUB_RESET;
 }
 
 static void __init em_x270_exeda_init(void)
@@ -1140,6 +1208,7 @@ static void __init em_x270_exeda_init(void)
         nand_rb = GPIO20_NAND_RB;
         dm9000_flags = DM9000_PLATF_16BITONLY;
         cam_reset = GPIO130_CAM_RESET;
+        usb_hub_reset = GPIO10_USB_HUB_RESET;
 }
 
 static void __init em_x270_init(void)