diff options
| -rw-r--r-- | arch/arm/mach-at91/include/mach/board.h | 4 | ||||
| -rw-r--r-- | drivers/usb/host/ohci-at91.c | 224 |
2 files changed, 219 insertions, 9 deletions
diff --git a/arch/arm/mach-at91/include/mach/board.h b/arch/arm/mach-at91/include/mach/board.h index 61d52dc05051..d07767f4052e 100644 --- a/arch/arm/mach-at91/include/mach/board.h +++ b/arch/arm/mach-at91/include/mach/board.h @@ -99,6 +99,10 @@ struct at91_usbh_data { u8 ports; /* number of ports on root hub */ u8 vbus_pin[2]; /* port power-control pin */ u8 vbus_pin_inverted; + u8 overcurrent_supported; + u8 overcurrent_pin[2]; + u8 overcurrent_status[2]; + u8 overcurrent_changed[2]; }; extern void __init at91_add_device_usbh(struct at91_usbh_data *data); extern void __init at91_add_device_usbh_ohci(struct at91_usbh_data *data); diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c index 5dd381fc2ddb..ba3a46b78b75 100644 --- a/drivers/usb/host/ohci-at91.c +++ b/drivers/usb/host/ohci-at91.c @@ -218,6 +218,156 @@ ohci_at91_start (struct usb_hcd *hcd) return 0; } +static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable) +{ + if (port < 0 || port >= 2) + return; + + gpio_set_value(pdata->vbus_pin[port], !pdata->vbus_pin_inverted ^ enable); +} + +static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port) +{ + if (port < 0 || port >= 2) + return -EINVAL; + + return gpio_get_value(pdata->vbus_pin[port]) ^ !pdata->vbus_pin_inverted; +} + +/* + * Update the status data from the hub with the over-current indicator change. + */ +static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf) +{ + struct at91_usbh_data *pdata = hcd->self.controller->platform_data; + int length = ohci_hub_status_data(hcd, buf); + int port; + + for (port = 0; port < ARRAY_SIZE(pdata->overcurrent_pin); port++) { + if (pdata->overcurrent_changed[port]) { + if (! length) + length = 1; + buf[0] |= 1 << (port + 1); + } + } + + return length; +} + +/* + * Look at the control requests to the root hub and see if we need to override. + */ +static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, + u16 wIndex, char *buf, u16 wLength) +{ + struct at91_usbh_data *pdata = hcd->self.controller->platform_data; + struct usb_hub_descriptor *desc; + int ret = -EINVAL; + u32 *data = (u32 *)buf; + + dev_dbg(hcd->self.controller, + "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n", + hcd, typeReq, wValue, wIndex, buf, wLength); + + switch (typeReq) { + case SetPortFeature: + if (wValue == USB_PORT_FEAT_POWER) { + dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n"); + ohci_at91_usb_set_power(pdata, wIndex - 1, 1); + goto out; + } + break; + + case ClearPortFeature: + switch (wValue) { + case USB_PORT_FEAT_C_OVER_CURRENT: + dev_dbg(hcd->self.controller, + "ClearPortFeature: C_OVER_CURRENT\n"); + + if (wIndex == 1 || wIndex == 2) { + pdata->overcurrent_changed[wIndex-1] = 0; + pdata->overcurrent_status[wIndex-1] = 0; + } + + goto out; + + case USB_PORT_FEAT_OVER_CURRENT: + dev_dbg(hcd->self.controller, + "ClearPortFeature: OVER_CURRENT\n"); + + if (wIndex == 1 || wIndex == 2) { + pdata->overcurrent_status[wIndex-1] = 0; + } + + goto out; + + case USB_PORT_FEAT_POWER: + dev_dbg(hcd->self.controller, + "ClearPortFeature: POWER\n"); + + if (wIndex == 1 || wIndex == 2) { + ohci_at91_usb_set_power(pdata, wIndex - 1, 0); + return 0; + } + } + break; + } + + ret = ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength); + if (ret) + goto out; + + switch (typeReq) { + case GetHubDescriptor: + + /* update the hub's descriptor */ + + desc = (struct usb_hub_descriptor *)buf; + + dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n", + desc->wHubCharacteristics); + + /* remove the old configurations for power-switching, and + * over-current protection, and insert our new configuration + */ + + desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM); + desc->wHubCharacteristics |= cpu_to_le16(0x0001); + + if (pdata->overcurrent_supported) { + desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM); + desc->wHubCharacteristics |= cpu_to_le16(0x0008|0x0001); + } + + dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n", + desc->wHubCharacteristics); + + return ret; + + case GetPortStatus: + /* check port status */ + + dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex); + + if (wIndex == 1 || wIndex == 2) { + if (! ohci_at91_usb_get_power(pdata, wIndex-1)) { + *data &= ~cpu_to_le32(RH_PS_PPS); + } + + if (pdata->overcurrent_changed[wIndex-1]) { + *data |= cpu_to_le32(RH_PS_OCIC); + } + + if (pdata->overcurrent_status[wIndex-1]) { + *data |= cpu_to_le32(RH_PS_POCI); + } + } + } + + out: + return ret; +} + /*-------------------------------------------------------------------------*/ static const struct hc_driver ohci_at91_hc_driver = { @@ -253,8 +403,8 @@ static const struct hc_driver ohci_at91_hc_driver = { /* * root hub support */ - .hub_status_data = ohci_hub_status_data, - .hub_control = ohci_hub_control, + .hub_status_data = ohci_at91_hub_status_data, + .hub_control = ohci_at91_hub_control, #ifdef CONFIG_PM .bus_suspend = ohci_bus_suspend, .bus_resume = ohci_bus_resume, @@ -264,22 +414,71 @@ static const struct hc_driver ohci_at91_hc_driver = { /*-------------------------------------------------------------------------*/ +static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data) +{ + struct platform_device *pdev = data; + struct at91_usbh_data *pdata = pdev->dev.platform_data; + int val, gpio, port; + + /* From the GPIO notifying the over-current situation, find + * out the corresponding port */ + gpio = irq_to_gpio(irq); + for (port = 0; port < ARRAY_SIZE(pdata->overcurrent_pin); port++) { + if (pdata->overcurrent_pin[port] == gpio) + break; + } + + if (port == ARRAY_SIZE(pdata->overcurrent_pin)) { + dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n"); + return IRQ_HANDLED; + } + + val = gpio_get_value(gpio); + + /* When notified of an over-current situation, disable power + on the corresponding port, and mark this port in + over-current. */ + if (! val) { + ohci_at91_usb_set_power(pdata, port, 0); + pdata->overcurrent_status[port] = 1; + pdata->overcurrent_changed[port] = 1; + } + + dev_dbg(& pdev->dev, "overcurrent situation %s\n", + val ? "exited" : "notified"); + + return IRQ_HANDLED; +} + +/*-------------------------------------------------------------------------*/ + static int ohci_hcd_at91_drv_probe(struct platform_device *pdev) { struct at91_usbh_data *pdata = pdev->dev.platform_data; int i; if (pdata) { - /* REVISIT make the driver support per-port power switching, - * and also overcurrent detection. Here we assume the ports - * are always powered while this driver is active, and use - * active-low power switches. - */ for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) { if (pdata->vbus_pin[i] <= 0) continue; gpio_request(pdata->vbus_pin[i], "ohci_vbus"); - gpio_direction_output(pdata->vbus_pin[i], pdata->vbus_pin_inverted); + ohci_at91_usb_set_power(pdata, i, 1); + } + + for (i = 0; i < ARRAY_SIZE(pdata->overcurrent_pin); i++) { + int ret; + + if (pdata->overcurrent_pin[i] <= 0) + continue; + gpio_request(pdata->overcurrent_pin[i], "ohci_overcurrent"); + + ret = request_irq(gpio_to_irq(pdata->overcurrent_pin[i]), + ohci_hcd_at91_overcurrent_irq, + IRQF_SHARED, "ohci_overcurrent", pdev); + if (ret) { + gpio_free(pdata->overcurrent_pin[i]); + dev_warn(& pdev->dev, "cannot get GPIO IRQ for overcurrent\n"); + } } } @@ -296,9 +495,16 @@ static int ohci_hcd_at91_drv_remove(struct platform_device *pdev) for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) { if (pdata->vbus_pin[i] <= 0) continue; - gpio_direction_output(pdata->vbus_pin[i], !pdata->vbus_pin_inverted); + ohci_at91_usb_set_power(pdata, i, 0); gpio_free(pdata->vbus_pin[i]); } + + for (i = 0; i < ARRAY_SIZE(pdata->overcurrent_pin); i++) { + if (pdata->overcurrent_pin[i] <= 0) + continue; + free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev); + gpio_free(pdata->overcurrent_pin[i]); + } } device_init_wakeup(&pdev->dev, 0); |