diff options
Diffstat (limited to 'drivers/usb/host/ehci-hub.c')
| -rw-r--r-- | drivers/usb/host/ehci-hub.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index 076474d95dbf..3cfba69e0767 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -190,6 +190,103 @@ static int ehci_bus_resume (struct usb_hcd *hcd) /*-------------------------------------------------------------------------*/ +/* Display the ports dedicated to the companion controller */ +static ssize_t show_companion(struct class_device *class_dev, char *buf) +{ + struct ehci_hcd *ehci; + int nports, index, n; + int count = PAGE_SIZE; + char *ptr = buf; + + ehci = hcd_to_ehci(bus_to_hcd(class_get_devdata(class_dev))); + nports = HCS_N_PORTS(ehci->hcs_params); + + for (index = 0; index < nports; ++index) { + if (test_bit(index, &ehci->companion_ports)) { + n = scnprintf(ptr, count, "%d\n", index + 1); + ptr += n; + count -= n; + } + } + return ptr - buf; +} + +/* + * Dedicate or undedicate a port to the companion controller. + * Syntax is "[-]portnum", where a leading '-' sign means + * return control of the port to the EHCI controller. + */ +static ssize_t store_companion(struct class_device *class_dev, + const char *buf, size_t count) +{ + struct ehci_hcd *ehci; + int portnum, new_owner, try; + u32 __iomem *status_reg; + u32 port_status; + + ehci = hcd_to_ehci(bus_to_hcd(class_get_devdata(class_dev))); + new_owner = PORT_OWNER; /* Owned by companion */ + if (sscanf(buf, "%d", &portnum) != 1) + return -EINVAL; + if (portnum < 0) { + portnum = - portnum; + new_owner = 0; /* Owned by EHCI */ + } + if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params)) + return -ENOENT; + status_reg = &ehci->regs->port_status[--portnum]; + if (new_owner) + set_bit(portnum, &ehci->companion_ports); + else + clear_bit(portnum, &ehci->companion_ports); + + /* + * The controller won't set the OWNER bit if the port is + * enabled, so this loop will sometimes require at least two + * iterations: one to disable the port and one to set OWNER. + */ + + for (try = 4; try > 0; --try) { + spin_lock_irq(&ehci->lock); + port_status = ehci_readl(ehci, status_reg); + if ((port_status & PORT_OWNER) == new_owner + || (port_status & (PORT_OWNER | PORT_CONNECT)) + == 0) + try = 0; + else { + port_status ^= PORT_OWNER; + port_status &= ~(PORT_PE | PORT_RWC_BITS); + ehci_writel(ehci, port_status, status_reg); + } + spin_unlock_irq(&ehci->lock); + if (try > 1) + msleep(5); + } + return count; +} +static CLASS_DEVICE_ATTR(companion, 0644, show_companion, store_companion); + +static inline void create_companion_file(struct ehci_hcd *ehci) +{ + int i; + + /* with integrated TT there is no companion! */ + if (!ehci_is_TDI(ehci)) + i = class_device_create_file(ehci_to_hcd(ehci)->self.class_dev, + &class_device_attr_companion); +} + +static inline void remove_companion_file(struct ehci_hcd *ehci) +{ + /* with integrated TT there is no companion! */ + if (!ehci_is_TDI(ehci)) + class_device_remove_file(ehci_to_hcd(ehci)->self.class_dev, + &class_device_attr_companion); +} + + +/*-------------------------------------------------------------------------*/ + static int check_reset_complete ( struct ehci_hcd *ehci, int index, @@ -504,6 +601,16 @@ static int ehci_hub_control ( ehci_readl(ehci, status_reg)); } + /* transfer dedicated ports to the companion hc */ + if ((temp & PORT_CONNECT) && + test_bit(wIndex, &ehci->companion_ports)) { + temp &= ~PORT_RWC_BITS; + temp |= PORT_OWNER; + ehci_writel(ehci, temp, status_reg); + ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1); + temp = ehci_readl(ehci, status_reg); + } + /* * Even if OWNER is set, there's no harm letting khubd * see the wPortStatus values (they should all be 0 except |