diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/usb/host/uhci-hub.c | |
download | op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/usb/host/uhci-hub.c')
-rw-r--r-- | drivers/usb/host/uhci-hub.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/drivers/usb/host/uhci-hub.c b/drivers/usb/host/uhci-hub.c new file mode 100644 index 0000000..4c45ba8 --- /dev/null +++ b/drivers/usb/host/uhci-hub.c @@ -0,0 +1,299 @@ +/* + * 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) + +static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf) +{ + struct uhci_hcd *uhci = hcd_to_uhci(hcd); + 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)); + } + if (*buf && uhci->state == UHCI_SUSPENDED) + uhci->resume_detect = 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 (test_bit(port, &uhci->suspended_ports)) { + CLR_RH_PORTSTAT(USBPORTSC_SUSP | USBPORTSC_RD); + clear_bit(port, &uhci->suspended_ports); + clear_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); + } +} + +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); + + /* 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); + } else if (time_after_eq(jiffies, + uhci->ports_timeout)) { + uhci_finish_suspend(uhci, port, port_addr); + } + } + } +} + +/* 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; + + 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->suspended_ports)) + lstatus |= 2; + 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_bit(port, &uhci->suspended_ports); + 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 (test_bit(port, &uhci->suspended_ports) && + !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; +} |