| /* |
| * Universal Host Controller Interface driver for USB. |
| * |
| * Maintainer: Alan Stern <stern@rowland.harvard.edu> |
| * |
| * (C) Copyright 1999 Linus Torvalds |
| * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com |
| * (C) Copyright 1999 Randy Dunlap |
| * (C) Copyright 1999 Georg Acher, acher@in.tum.de |
| * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de |
| * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch |
| * (C) Copyright 2004 Alan Stern, stern@rowland.harvard.edu |
| */ |
| |
| static __u8 root_hub_hub_des[] = |
| { |
| 0x09, /* __u8 bLength; */ |
| 0x29, /* __u8 bDescriptorType; Hub-descriptor */ |
| 0x02, /* __u8 bNbrPorts; */ |
| 0x0a, /* __u16 wHubCharacteristics; */ |
| 0x00, /* (per-port OC, no power switching) */ |
| 0x01, /* __u8 bPwrOn2pwrGood; 2ms */ |
| 0x00, /* __u8 bHubContrCurrent; 0 mA */ |
| 0x00, /* __u8 DeviceRemovable; *** 7 Ports max *** */ |
| 0xff /* __u8 PortPwrCtrlMask; *** 7 ports max *** */ |
| }; |
| |
| #define UHCI_RH_MAXCHILD 7 |
| |
| /* must write as zeroes */ |
| #define WZ_BITS (USBPORTSC_RES2 | USBPORTSC_RES3 | USBPORTSC_RES4) |
| |
| /* status change bits: nonzero writes will clear */ |
| #define RWC_BITS (USBPORTSC_OCC | USBPORTSC_PEC | USBPORTSC_CSC) |
| |
| /* A port that either is connected or has a changed-bit set will prevent |
| * us from AUTO_STOPPING. |
| */ |
| static int any_ports_active(struct uhci_hcd *uhci) |
| { |
| int port; |
| |
| for (port = 0; port < uhci->rh_numports; ++port) { |
| if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) & |
| (USBPORTSC_CCS | RWC_BITS)) || |
| test_bit(port, &uhci->port_c_suspend)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| static inline int get_hub_status_data(struct uhci_hcd *uhci, char *buf) |
| { |
| int port; |
| |
| *buf = 0; |
| for (port = 0; port < uhci->rh_numports; ++port) { |
| if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) & RWC_BITS) || |
| test_bit(port, &uhci->port_c_suspend)) |
| *buf |= (1 << (port + 1)); |
| } |
| return !!*buf; |
| } |
| |
| #define OK(x) len = (x); break |
| |
| #define CLR_RH_PORTSTAT(x) \ |
| status = inw(port_addr); \ |
| status &= ~(RWC_BITS|WZ_BITS); \ |
| status &= ~(x); \ |
| status |= RWC_BITS & (x); \ |
| outw(status, port_addr) |
| |
| #define SET_RH_PORTSTAT(x) \ |
| status = inw(port_addr); \ |
| status |= (x); \ |
| status &= ~(RWC_BITS|WZ_BITS); \ |
| outw(status, port_addr) |
| |
| /* UHCI controllers don't automatically stop resume signalling after 20 msec, |
| * so we have to poll and check timeouts in order to take care of it. |
| */ |
| static void uhci_finish_suspend(struct uhci_hcd *uhci, int port, |
| unsigned long port_addr) |
| { |
| int status; |
| |
| if (inw(port_addr) & (USBPORTSC_SUSP | USBPORTSC_RD)) { |
| CLR_RH_PORTSTAT(USBPORTSC_SUSP | USBPORTSC_RD); |
| if (test_bit(port, &uhci->resuming_ports)) |
| set_bit(port, &uhci->port_c_suspend); |
| |
| /* The controller won't actually turn off the RD bit until |
| * it has had a chance to send a low-speed EOP sequence, |
| * which takes 3 bit times (= 2 microseconds). We'll delay |
| * slightly longer for good luck. */ |
| udelay(4); |
| } |
| clear_bit(port, &uhci->resuming_ports); |
| } |
| |
| /* Wait for the UHCI controller in HP's iLO2 server management chip. |
| * It can take up to 250 us to finish a reset and set the CSC bit. |
| */ |
| static void wait_for_HP(unsigned long port_addr) |
| { |
| int i; |
| |
| for (i = 10; i < 250; i += 10) { |
| if (inw(port_addr) & USBPORTSC_CSC) |
| return; |
| udelay(10); |
| } |
| /* Log a warning? */ |
| } |
| |
| static void uhci_check_ports(struct uhci_hcd *uhci) |
| { |
| unsigned int port; |
| unsigned long port_addr; |
| int status; |
| |
| for (port = 0; port < uhci->rh_numports; ++port) { |
| port_addr = uhci->io_addr + USBPORTSC1 + 2 * port; |
| status = inw(port_addr); |
| if (unlikely(status & USBPORTSC_PR)) { |
| if (time_after_eq(jiffies, uhci->ports_timeout)) { |
| CLR_RH_PORTSTAT(USBPORTSC_PR); |
| udelay(10); |
| |
| /* HP's server management chip requires |
| * a longer delay. */ |
| if (to_pci_dev(uhci_dev(uhci))->vendor == |
| PCI_VENDOR_ID_HP) |
| wait_for_HP(port_addr); |
| |
| /* If the port was enabled before, turning |
| * reset on caused a port enable change. |
| * Turning reset off causes a port connect |
| * status change. Clear these changes. */ |
| CLR_RH_PORTSTAT(USBPORTSC_CSC | USBPORTSC_PEC); |
| SET_RH_PORTSTAT(USBPORTSC_PE); |
| } |
| } |
| if (unlikely(status & USBPORTSC_RD)) { |
| if (!test_bit(port, &uhci->resuming_ports)) { |
| |
| /* Port received a wakeup request */ |
| set_bit(port, &uhci->resuming_ports); |
| uhci->ports_timeout = jiffies + |
| msecs_to_jiffies(20); |
| |
| /* Make sure we see the port again |
| * after the resuming period is over. */ |
| mod_timer(&uhci_to_hcd(uhci)->rh_timer, |
| uhci->ports_timeout); |
| } else if (time_after_eq(jiffies, |
| uhci->ports_timeout)) { |
| uhci_finish_suspend(uhci, port, port_addr); |
| } |
| } |
| } |
| } |
| |
| static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf) |
| { |
| struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| unsigned long flags; |
| int status = 0; |
| |
| spin_lock_irqsave(&uhci->lock, flags); |
| |
| uhci_scan_schedule(uhci, NULL); |
| if (uhci->hc_inaccessible) |
| goto done; |
| check_fsbr(uhci); |
| uhci_check_ports(uhci); |
| |
| status = get_hub_status_data(uhci, buf); |
| |
| switch (uhci->rh_state) { |
| case UHCI_RH_SUSPENDING: |
| case UHCI_RH_SUSPENDED: |
| /* if port change, ask to be resumed */ |
| if (status) |
| usb_hcd_resume_root_hub(hcd); |
| break; |
| |
| case UHCI_RH_AUTO_STOPPED: |
| /* if port change, auto start */ |
| if (status) |
| wakeup_rh(uhci); |
| break; |
| |
| case UHCI_RH_RUNNING: |
| /* are any devices attached? */ |
| if (!any_ports_active(uhci)) { |
| uhci->rh_state = UHCI_RH_RUNNING_NODEVS; |
| uhci->auto_stop_time = jiffies + HZ; |
| } |
| break; |
| |
| case UHCI_RH_RUNNING_NODEVS: |
| /* auto-stop if nothing connected for 1 second */ |
| if (any_ports_active(uhci)) |
| uhci->rh_state = UHCI_RH_RUNNING; |
| else if (time_after_eq(jiffies, uhci->auto_stop_time)) |
| suspend_rh(uhci, UHCI_RH_AUTO_STOPPED); |
| break; |
| |
| default: |
| break; |
| } |
| |
| done: |
| spin_unlock_irqrestore(&uhci->lock, flags); |
| return status; |
| } |
| |
| /* size of returned buffer is part of USB spec */ |
| static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, |
| u16 wIndex, char *buf, u16 wLength) |
| { |
| struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| int status, lstatus, retval = 0, len = 0; |
| unsigned int port = wIndex - 1; |
| unsigned long port_addr = uhci->io_addr + USBPORTSC1 + 2 * port; |
| u16 wPortChange, wPortStatus; |
| unsigned long flags; |
| |
| if (uhci->hc_inaccessible) |
| return -ETIMEDOUT; |
| |
| spin_lock_irqsave(&uhci->lock, flags); |
| switch (typeReq) { |
| |
| case GetHubStatus: |
| *(__le32 *)buf = cpu_to_le32(0); |
| OK(4); /* hub power */ |
| case GetPortStatus: |
| if (port >= uhci->rh_numports) |
| goto err; |
| |
| uhci_check_ports(uhci); |
| status = inw(port_addr); |
| |
| /* Intel controllers report the OverCurrent bit active on. |
| * VIA controllers report it active off, so we'll adjust the |
| * bit value. (It's not standardized in the UHCI spec.) |
| */ |
| if (to_pci_dev(hcd->self.controller)->vendor == |
| PCI_VENDOR_ID_VIA) |
| status ^= USBPORTSC_OC; |
| |
| /* UHCI doesn't support C_RESET (always false) */ |
| wPortChange = lstatus = 0; |
| if (status & USBPORTSC_CSC) |
| wPortChange |= USB_PORT_STAT_C_CONNECTION; |
| if (status & USBPORTSC_PEC) |
| wPortChange |= USB_PORT_STAT_C_ENABLE; |
| if (status & USBPORTSC_OCC) |
| wPortChange |= USB_PORT_STAT_C_OVERCURRENT; |
| |
| if (test_bit(port, &uhci->port_c_suspend)) { |
| wPortChange |= USB_PORT_STAT_C_SUSPEND; |
| lstatus |= 1; |
| } |
| if (test_bit(port, &uhci->resuming_ports)) |
| lstatus |= 4; |
| |
| /* UHCI has no power switching (always on) */ |
| wPortStatus = USB_PORT_STAT_POWER; |
| if (status & USBPORTSC_CCS) |
| wPortStatus |= USB_PORT_STAT_CONNECTION; |
| if (status & USBPORTSC_PE) { |
| wPortStatus |= USB_PORT_STAT_ENABLE; |
| if (status & (USBPORTSC_SUSP | USBPORTSC_RD)) |
| wPortStatus |= USB_PORT_STAT_SUSPEND; |
| } |
| if (status & USBPORTSC_OC) |
| wPortStatus |= USB_PORT_STAT_OVERCURRENT; |
| if (status & USBPORTSC_PR) |
| wPortStatus |= USB_PORT_STAT_RESET; |
| if (status & USBPORTSC_LSDA) |
| wPortStatus |= USB_PORT_STAT_LOW_SPEED; |
| |
| if (wPortChange) |
| dev_dbg(uhci_dev(uhci), "port %d portsc %04x,%02x\n", |
| wIndex, status, lstatus); |
| |
| *(__le16 *)buf = cpu_to_le16(wPortStatus); |
| *(__le16 *)(buf + 2) = cpu_to_le16(wPortChange); |
| OK(4); |
| case SetHubFeature: /* We don't implement these */ |
| case ClearHubFeature: |
| switch (wValue) { |
| case C_HUB_OVER_CURRENT: |
| case C_HUB_LOCAL_POWER: |
| OK(0); |
| default: |
| goto err; |
| } |
| break; |
| case SetPortFeature: |
| if (port >= uhci->rh_numports) |
| goto err; |
| |
| switch (wValue) { |
| case USB_PORT_FEAT_SUSPEND: |
| SET_RH_PORTSTAT(USBPORTSC_SUSP); |
| OK(0); |
| case USB_PORT_FEAT_RESET: |
| SET_RH_PORTSTAT(USBPORTSC_PR); |
| |
| /* Reset terminates Resume signalling */ |
| uhci_finish_suspend(uhci, port, port_addr); |
| |
| /* USB v2.0 7.1.7.5 */ |
| uhci->ports_timeout = jiffies + msecs_to_jiffies(50); |
| OK(0); |
| case USB_PORT_FEAT_POWER: |
| /* UHCI has no power switching */ |
| OK(0); |
| default: |
| goto err; |
| } |
| break; |
| case ClearPortFeature: |
| if (port >= uhci->rh_numports) |
| goto err; |
| |
| switch (wValue) { |
| case USB_PORT_FEAT_ENABLE: |
| CLR_RH_PORTSTAT(USBPORTSC_PE); |
| |
| /* Disable terminates Resume signalling */ |
| uhci_finish_suspend(uhci, port, port_addr); |
| OK(0); |
| case USB_PORT_FEAT_C_ENABLE: |
| CLR_RH_PORTSTAT(USBPORTSC_PEC); |
| OK(0); |
| case USB_PORT_FEAT_SUSPEND: |
| if (!(inw(port_addr) & USBPORTSC_SUSP)) { |
| |
| /* Make certain the port isn't suspended */ |
| uhci_finish_suspend(uhci, port, port_addr); |
| } else if (!test_and_set_bit(port, |
| &uhci->resuming_ports)) { |
| SET_RH_PORTSTAT(USBPORTSC_RD); |
| |
| /* The controller won't allow RD to be set |
| * if the port is disabled. When this happens |
| * just skip the Resume signalling. |
| */ |
| if (!(inw(port_addr) & USBPORTSC_RD)) |
| uhci_finish_suspend(uhci, port, |
| port_addr); |
| else |
| /* USB v2.0 7.1.7.7 */ |
| uhci->ports_timeout = jiffies + |
| msecs_to_jiffies(20); |
| } |
| OK(0); |
| case USB_PORT_FEAT_C_SUSPEND: |
| clear_bit(port, &uhci->port_c_suspend); |
| OK(0); |
| case USB_PORT_FEAT_POWER: |
| /* UHCI has no power switching */ |
| goto err; |
| case USB_PORT_FEAT_C_CONNECTION: |
| CLR_RH_PORTSTAT(USBPORTSC_CSC); |
| OK(0); |
| case USB_PORT_FEAT_C_OVER_CURRENT: |
| CLR_RH_PORTSTAT(USBPORTSC_OCC); |
| OK(0); |
| case USB_PORT_FEAT_C_RESET: |
| /* this driver won't report these */ |
| OK(0); |
| default: |
| goto err; |
| } |
| break; |
| case GetHubDescriptor: |
| len = min_t(unsigned int, sizeof(root_hub_hub_des), wLength); |
| memcpy(buf, root_hub_hub_des, len); |
| if (len > 2) |
| buf[2] = uhci->rh_numports; |
| OK(len); |
| default: |
| err: |
| retval = -EPIPE; |
| } |
| spin_unlock_irqrestore(&uhci->lock, flags); |
| |
| return retval; |
| } |