/* * PCI Bus Services, see include/linux/pci.h for further explanation. * * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter, * David Mosberger-Tang * * Copyright 1997 -- 2000 Martin Mares */ #include #include #include #include #include #include #include #include #include #include #include #include #include /* isa_dma_bridge_buggy */ #include "pci.h" unsigned int pci_pm_d3_delay = PCI_PM_D3_WAIT; #ifdef CONFIG_PCI_DOMAINS int pci_domains_supported = 1; #endif #define DEFAULT_CARDBUS_IO_SIZE (256) #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024) /* pci=cbmemsize=nnM,cbiosize=nn can override this */ unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE; unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE; /** * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children * @bus: pointer to PCI bus structure to search * * Given a PCI bus, returns the highest PCI bus number present in the set * including the given PCI bus and its list of child PCI buses. */ unsigned char pci_bus_max_busnr(struct pci_bus* bus) { struct list_head *tmp; unsigned char max, n; max = bus->subordinate; list_for_each(tmp, &bus->children) { n = pci_bus_max_busnr(pci_bus_b(tmp)); if(n > max) max = n; } return max; } EXPORT_SYMBOL_GPL(pci_bus_max_busnr); #ifdef CONFIG_HAS_IOMEM void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar) { /* * Make sure the BAR is actually a memory resource, not an IO resource */ if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) { WARN_ON(1); return NULL; } return ioremap_nocache(pci_resource_start(pdev, bar), pci_resource_len(pdev, bar)); } EXPORT_SYMBOL_GPL(pci_ioremap_bar); #endif #if 0 /** * pci_max_busnr - returns maximum PCI bus number * * Returns the highest PCI bus number present in the system global list of * PCI buses. */ unsigned char __devinit pci_max_busnr(void) { struct pci_bus *bus = NULL; unsigned char max, n; max = 0; while ((bus = pci_find_next_bus(bus)) != NULL) { n = pci_bus_max_busnr(bus); if(n > max) max = n; } return max; } #endif /* 0 */ #define PCI_FIND_CAP_TTL 48 static int __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn, u8 pos, int cap, int *ttl) { u8 id; while ((*ttl)--) { pci_bus_read_config_byte(bus, devfn, pos, &pos); if (pos < 0x40) break; pos &= ~3; pci_bus_read_config_byte(bus, devfn, pos + PCI_CAP_LIST_ID, &id); if (id == 0xff) break; if (id == cap) return pos; pos += PCI_CAP_LIST_NEXT; } return 0; } static int __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn, u8 pos, int cap) { int ttl = PCI_FIND_CAP_TTL; return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl); } int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap) { return __pci_find_next_cap(dev->bus, dev->devfn, pos + PCI_CAP_LIST_NEXT, cap); } EXPORT_SYMBOL_GPL(pci_find_next_capability); static int __pci_bus_find_cap_start(struct pci_bus *bus, unsigned int devfn, u8 hdr_type) { u16 status; pci_bus_read_config_word(bus, devfn, PCI_STATUS, &status); if (!(status & PCI_STATUS_CAP_LIST)) return 0; switch (hdr_type) { case PCI_HEADER_TYPE_NORMAL: case PCI_HEADER_TYPE_BRIDGE: return PCI_CAPABILITY_LIST; case PCI_HEADER_TYPE_CARDBUS: return PCI_CB_CAPABILITY_LIST; default: return 0; } return 0; } /** * pci_find_capability - query for devices' capabilities * @dev: PCI device to query * @cap: capability code * * Tell if a device supports a given PCI capability. * Returns the address of the requested capability structure within the * device's PCI configuration space or 0 in case the device does not * support it. Possible values for @cap: * * %PCI_CAP_ID_PM Power Management * %PCI_CAP_ID_AGP Accelerated Graphics Port * %PCI_CAP_ID_VPD Vital Product Data * %PCI_CAP_ID_SLOTID Slot Identification * %PCI_CAP_ID_MSI Message Signalled Interrupts * %PCI_CAP_ID_CHSWP CompactPCI HotSwap * %PCI_CAP_ID_PCIX PCI-X * %PCI_CAP_ID_EXP PCI Express */ int pci_find_capability(struct pci_dev *dev, int cap) { int pos; pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); if (pos) pos = __pci_find_next_cap(dev->bus, dev->devfn, pos, cap); return pos; } /** * pci_bus_find_capability - query for devices' capabilities * @bus: the PCI bus to query * @devfn: PCI device to query * @cap: capability code * * Like pci_find_capability() but works for pci devices that do not have a * pci_dev structure set up yet. * * Returns the address of the requested capability structure within the * device's PCI configuration space or 0 in case the device does not * support it. */ int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap) { int pos; u8 hdr_type; pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type); pos = __pci_bus_find_cap_start(bus, devfn, hdr_type & 0x7f); if (pos) pos = __pci_find_next_cap(bus, devfn, pos, cap); return pos; } /** * pci_find_ext_capability - Find an extended capability * @dev: PCI device to query * @cap: capability code * * Returns the address of the requested extended capability structure * within the device's PCI configuration space or 0 if the device does * not support it. Possible values for @cap: * * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting * %PCI_EXT_CAP_ID_VC Virtual Channel * %PCI_EXT_CAP_ID_DSN Device Serial Number * %PCI_EXT_CAP_ID_PWR Power Budgeting */ int pci_find_ext_capability(struct pci_dev *dev, int cap) { u32 header; int ttl; int pos = PCI_CFG_SPACE_SIZE; /* minimum 8 bytes per capability */ ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; if (dev->cfg_size <= PCI_CFG_SPACE_SIZE) return 0; if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) return 0; /* * If we have no capabilities, this is indicated by cap ID, * cap version and next pointer all being 0. */ if (header == 0) return 0; while (ttl-- > 0) { if (PCI_EXT_CAP_ID(header) == cap) return pos; pos = PCI_EXT_CAP_NEXT(header); if (pos < PCI_CFG_SPACE_SIZE) break; if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) break; } return 0; } EXPORT_SYMBOL_GPL(pci_find_ext_capability); static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap) { int rc, ttl = PCI_FIND_CAP_TTL; u8 cap, mask; if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST) mask = HT_3BIT_CAP_MASK; else mask = HT_5BIT_CAP_MASK; pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos, PCI_CAP_ID_HT, &ttl); while (pos) { rc = pci_read_config_byte(dev, pos + 3, &cap); if (rc != PCIBIOS_SUCCESSFUL) return 0; if ((cap & mask) == ht_cap) return pos; pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos + PCI_CAP_LIST_NEXT, PCI_CAP_ID_HT, &ttl); } return 0; } /** * pci_find_next_ht_capability - query a device's Hypertransport capabilities * @dev: PCI device to query * @pos: Position from which to continue searching * @ht_cap: Hypertransport capability code * * To be used in conjunction with pci_find_ht_capability() to search for * all capabilities matching @ht_cap. @pos should always be a value returned * from pci_find_ht_capability(). * * NB. To be 100% safe against broken PCI devices, the caller should take * steps to avoid an infinite loop. */ int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap) { return __pci_find_next_ht_cap(dev, pos + PCI_CAP_LIST_NEXT, ht_cap); } EXPORT_SYMBOL_GPL(pci_find_next_ht_capability); /** * pci_find_ht_capability - query a device's Hypertransport capabilities * @dev: PCI device to query * @ht_cap: Hypertransport capability code * * Tell if a device supports a given Hypertransport capability. * Returns an address within the device's PCI configuration space * or 0 in case the device does not support the request capability. * The address points to the PCI capability, of type PCI_CAP_ID_HT, * which has a Hypertransport capability matching @ht_cap. */ int pci_find_ht_capability(struct pci_dev *dev, int ht_cap) { int pos; pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); if (pos) pos = __pci_find_next_ht_cap(dev, pos, ht_cap); return pos; } EXPORT_SYMBOL_GPL(pci_find_ht_capability); /** * pci_find_parent_resource - return resource region of parent bus of given region * @dev: PCI device structure contains resources to be searched * @res: child resource record for which parent is sought * * For given resource region of given device, return the resource * region of parent bus the given region is contained in or where * it should be allocated from. */ struct resource * pci_find_parent_resource(const struct pci_dev *dev, struct resource *res) { const struct pci_bus *bus = dev->bus; int i; struct resource *best = NULL; for(i = 0; i < PCI_BUS_NUM_RESOURCES; i++) { struct resource *r = bus->resource[i]; if (!r) continue; if (res->start && !(res->start >= r->start && res->end <= r->end)) continue; /* Not contained */ if ((res->flags ^ r->flags) & (IORESOURCE_IO | IORESOURCE_MEM)) continue; /* Wrong type */ if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH)) return r; /* Exact match */ if ((res->flags & IORESOURCE_PREFETCH) && !(r->flags & IORESOURCE_PREFETCH)) best = r; /* Approximating prefetchable by non-prefetchable */ } return best; } /** * pci_restore_bars - restore a devices BAR values (e.g. after wake-up) * @dev: PCI device to have its BARs restored * * Restore the BAR values for a given device, so as to make it * accessible by its driver. */ static void pci_restore_bars(struct pci_dev *dev) { int i; for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) pci_update_resource(dev, i); } static struct pci_platform_pm_ops *pci_platform_pm; int pci_set_platform_pm(struct pci_platform_pm_ops *ops) { if (!ops->is_manageable || !ops->set_state || !ops->choose_state || !ops->sleep_wake || !ops->can_wakeup) return -EINVAL; pci_platform_pm = ops; return 0; } static inline bool platform_pci_power_manageable(struct pci_dev *dev) { return pci_platform_pm ? pci_platform_pm->is_manageable(dev) : false; } static inline int platform_pci_set_power_state(struct pci_dev *dev, pci_power_t t) { return pci_platform_pm ? pci_platform_pm->set_state(dev, t) : -ENOSYS; } static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev) { return pci_platform_pm ? pci_platform_pm->choose_state(dev) : PCI_POWER_ERROR; } static inline bool platform_pci_can_wakeup(struct pci_dev *dev) { return pci_platform_pm ? pci_platform_pm->can_wakeup(dev) : false; } static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable) { return pci_platform_pm ? pci_platform_pm->sleep_wake(dev, enable) : -ENODEV; } /** * pci_raw_set_power_state - Use PCI PM registers to set the power state of * given PCI device * @dev: PCI device to handle. * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. * @wait: If 'true', wait for the device to change its power state * * RETURN VALUE: * -EINVAL if the requested state is invalid. * -EIO if device does not support PCI PM or its PM capabilities register has a * wrong version, or device doesn't support the requested state. * 0 if device already is in the requested state. * 0 if device's power state has been successfully changed. */ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state, bool wait) { u16 pmcsr; bool need_restore = false; if (!dev->pm_cap) return -EIO; if (state < PCI_D0 || state > PCI_D3hot) return -EINVAL; /* Validate current state: * Can enter D0 from any state, but if we can only go deeper * to sleep if we're already in a low power state */ if (dev->current_state == state) { /* we're already there */ return 0; } else if (state != PCI_D0 && dev->current_state <= PCI_D3cold && dev->current_state > state) { dev_err(&dev->dev, "invalid power transition " "(from state %d to %d)\n", dev->current_state, state); return -EINVAL; } /* check if this device supports the desired state */ if ((state == PCI_D1 && !dev->d1_support) || (state == PCI_D2 && !dev->d2_support)) return -EIO; pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); /* If we're (effectively) in D3, force entire word to 0. * This doesn't affect PME_Status, disables PME_En, and * sets PowerState to 0. */ switch (dev->current_state) { case PCI_D0: case PCI_D1: case PCI_D2: pmcsr &= ~PCI_PM_CTRL_STATE_MASK; pmcsr |= state; break; case PCI_UNKNOWN: /* Boot-up */ if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET)) { need_restore = true; wait = true; } /* Fall-through: force to D0 */ default: pmcsr = 0; break; } /* enter specified state */ pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); if (!wait) return 0; /* Mandatory power management transition delays */ /* see PCI PM 1.1 5.6.1 table 18 */ if (state == PCI_D3hot || dev->current_state == PCI_D3hot) msleep(pci_pm_d3_delay); else if (state == PCI_D2 || dev->current_state == PCI_D2) udelay(PCI_PM_D2_DELAY); dev->current_state = state; /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning * from D3hot to D0 _may_ perform an internal reset, thereby * going to "D0 Uninitialized" rather than "D0 Initialized". * For example, at least some versions of the 3c905B and the * 3c556B exhibit this behaviour. * * At least some laptop BIOSen (e.g. the Thinkpad T21) leave * devices in a D3hot state at boot. Consequently, we need to * restore at least the BARs so that the device will be * accessible to its driver. */ if (need_restore) pci_restore_bars(dev); if (wait && dev->bus->self) pcie_aspm_pm_state_change(dev->bus->self); return 0; } /** * pci_update_current_state - Read PCI power state of given device from its * PCI PM registers and cache it * @dev: PCI device to handle. * @state: State to cache in case the device doesn't have the PM capability */ void pci_update_current_state(struct pci_dev *dev, pci_power_t state) { if (dev->pm_cap) { u16 pmcsr; pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); } else { dev->current_state = state; } } /** * pci_set_power_state - Set the power state of a PCI device * @dev: PCI device to handle. * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. * * Transition a device to a new power state, using the platform formware and/or * the device's PCI PM registers. * * RETURN VALUE: * -EINVAL if the requested state is invalid. * -EIO if device does not support PCI PM or its PM capabilities register has a * wrong version, or device doesn't support the requested state. * 0 if device already is in the requested state. * 0 if device's power state has been successfully changed. */ int pci_set_power_state(struct pci_dev *dev, pci_power_t state) { int error; /* bound the state we're entering */ if (state > PCI_D3hot) state = PCI_D3hot; else if (state < PCI_D0) state = PCI_D0; else if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev)) /* * If the device or the parent bridge do not support PCI PM, * ignore the request if we're doing anything other than putting * it into D0 (which would only happen on boot). */ return 0; if (state == PCI_D0 && platform_pci_power_manageable(dev)) { /* * Allow the platform to change the state, for example via ACPI * _PR0, _PS0 and some such, but do not trust it. */ int ret = platform_pci_set_power_state(dev, PCI_D0); if (!ret) pci_update_current_state(dev, PCI_D0); } /* This device is quirked not to be put into D3, so don't put it in D3 */ if (state == PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3)) return 0; error = pci_raw_set_power_state(dev, state, true); if (state > PCI_D0 && platform_pci_power_manageable(dev)) { /* Allow the platform to finalize the transition */ int ret = platform_pci_set_power_state(dev, state); if (!ret) { pci_update_current_state(dev, state); error = 0; } } return error; } /** * pci_choose_state - Choose the power state of a PCI device * @dev: PCI device to be suspended * @state: target sleep state for the whole system. This is the value * that is passed to suspend() function. * * Returns PCI power state suitable for given device and given system * message. */ pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state) { pci_power_t ret; if (!pci_find_capability(dev, PCI_CAP_ID_PM)) return PCI_D0; ret = platform_pci_choose_state(dev); if (ret != PCI_POWER_ERROR) return ret; switch (state.event) { case PM_EVENT_ON: return PCI_D0; case PM_EVENT_FREEZE: case PM_EVENT_PRETHAW: /* REVISIT both freeze and pre-thaw "should" use D0 */ case PM_EVENT_SUSPEND: case PM_EVENT_HIBERNATE: return PCI_D3hot; default: dev_info(&dev->dev, "unrecognized suspend event %d\n", state.event); BUG(); } return PCI_D0; } EXPORT_SYMBOL(pci_choose_state); static int pci_save_pcie_state(struct pci_dev *dev) { int pos, i = 0; struct pci_cap_saved_state *save_state; u16 *cap; pos = pci_find_capability(dev, PCI_CAP_ID_EXP); if (pos <= 0) return 0; save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); if (!save_state) { dev_err(&dev->dev, "buffer not found in %s\n", __func__); return -ENOMEM; } cap = (u16 *)&save_state->data[0]; pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]); pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]); pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]); pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]); return 0; } static void pci_restore_pcie_state(struct pci_dev *dev) { int i = 0, pos; struct pci_cap_saved_state *save_state; u16 *cap; save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); pos = pci_find_capability(dev, PCI_CAP_ID_EXP); if (!save_state || pos <= 0) return; cap = (u16 *)&save_state->data[0]; pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]); pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]); pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]); pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]); } static int pci_save_pcix_state(struct pci_dev *dev) { int pos; struct pci_cap_saved_state *save_state; pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); if (pos <= 0) return 0; save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); if (!save_state) { dev_err(&dev->dev, "buffer not found in %s\n", __func__); return -ENOMEM; } pci_read_config_word(dev, pos + PCI_X_CMD, (u16 *)save_state->data); return 0; } static void pci_restore_pcix_state(struct pci_dev *dev) { int i = 0, pos; struct pci_cap_saved_state *save_state; u16 *cap; save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); if (!save_state || pos <= 0) return; cap = (u16 *)&save_state->data[0]; pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]); } /** * pci_save_state - save the PCI configuration space of a device before suspending * @dev: - PCI device that we're dealing with */ int pci_save_state(struct pci_dev *dev) { int i; /* XXX: 100% dword access ok here? */ for (i = 0; i < 16; i++) pci_read_config_dword(dev, i * 4,&dev->saved_config_space[i]); dev->state_saved = true; if ((i = pci_save_pcie_state(dev)) != 0) return i; if ((i = pci_save_pcix_state(dev)) != 0) return i; return 0; } /** * pci_restore_state - Restore the saved state of a PCI device * @dev: - PCI device that we're dealing with */ int pci_restore_state(struct pci_dev *dev) { int i; u32 val; /* PCI Express register must be restored first */ pci_restore_pcie_state(dev); /* * The Base Address register should be programmed before the command * register(s) */ for (i = 15; i >= 0; i--) { pci_read_config_dword(dev, i * 4, &val); if (val != dev->saved_config_space[i]) { dev_printk(KERN_DEBUG, &dev->dev, "restoring config " "space at offset %#x (was %#x, writing %#x)\n", i, val, (int)dev->saved_config_space[i]); pci_write_config_dword(dev,i * 4, dev->saved_config_space[i]); } } pci_restore_pcix_state(dev); pci_restore_msi_state(dev); return 0; } static int do_pci_enable_device(struct pci_dev *dev, int bars) { int err; err = pci_set_power_state(dev, PCI_D0); if (err < 0 && err != -EIO) return err; err = pcibios_enable_device(dev, bars); if (err < 0) return err; pci_fixup_device(pci_fixup_enable, dev); return 0; } /** * pci_reenable_device - Resume abandoned device * @dev: PCI device to be resumed * * Note this function is a backend of pci_default_resume and is not supposed * to be called by normal code, write proper resume handler and use it instead. */ int pci_reenable_device(struct pci_dev *dev) { if (atomic_read(&dev->enable_cnt)) return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1); return 0; } static int __pci_enable_device_flags(struct pci_dev *dev, resource_size_t flags) { int err; int i, bars = 0; if (atomic_add_return(1, &dev->enable_cnt) > 1) return 0; /* already enabled */ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) if (dev->resource[i].flags & flags) bars |= (1 << i); err = do_pci_enable_device(dev, bars); if (err < 0) atomic_dec(&dev->enable_cnt); return err; } /** * pci_enable_device_io - Initialize a device for use with IO space * @dev: PCI device to be initialized * * Initialize device before it's used by a driver. Ask low-level code * to enable I/O resources. Wake up the device if it was suspended. * Beware, this function can fail. */ int pci_enable_device_io(struct pci_dev *dev) { return __pci_enable_device_flags(dev, IORESOURCE_IO); } /** * pci_enable_device_mem - Initialize a device for use with Memory space * @dev: PCI device to be initialized * * Initialize device before it's used by a driver. Ask low-level code * to enable Memory resources. Wake up the device if it was suspended. * Beware, this function can fail. */ int pci_enable_device_mem(struct pci_dev *dev) { return __pci_enable_device_flags(dev, IORESOURCE_MEM); } /** * pci_enable_device - Initialize device before it's used by a driver. * @dev: PCI device to be initialized * * Initialize device before it's used by a driver. Ask low-level code * to enable I/O and memory. Wake up the device if it was suspended. * Beware, this function can fail. * * Note we don't actually enable the device many times if we call * this function repeatedly (we just increment the count). */ int pci_enable_device(struct pci_dev *dev) { return __pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO); } /* * Managed PCI resources. This manages device on/off, intx/msi/msix * on/off and BAR regions. pci_dev itself records msi/msix status, so * there's no need to track it separately. pci_devres is initialized * when a device is enabled using managed PCI device enable interface. */ struct pci_devres { unsigned int enabled:1; unsigned int pinned:1; unsigned int orig_intx:1; unsigned int restore_intx:1; u32 region_mask; }; static void pcim_release(struct device *gendev, void *res) { struct pci_dev *dev = container_of(gendev, struct pci_dev, dev); struct pci_devres *this = res; int i; if (dev->msi_enabled) pci_disable_msi(dev); if (dev->msix_enabled) pci_disable_msix(dev); for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) if (this->region_mask & (1 << i)) pci_release_region(dev, i); if (this->restore_intx) pci_intx(dev, this->orig_intx); if (this->enabled && !this->pinned) pci_disable_device(dev); } static struct pci_devres * get_pci_dr(struct pci_dev *pdev) { struct pci_devres *dr, *new_dr; dr = devres_find(&pdev->dev, pcim_release, NULL, NULL); if (dr) return dr; new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL); if (!new_dr) return NULL; return devres_get(&pdev->dev, new_dr, NULL, NULL); } static struct pci_devres * find_pci_dr(struct pci_dev *pdev) { if (pci_is_managed(pdev)) return devres_find(&pdev->dev, pcim_release, NULL, NULL); return NULL; } /** * pcim_enable_device - Managed pci_enable_device() * @pdev: PCI device to be initialized * * Managed pci_enable_device(). */ int pcim_enable_device(struct pci_dev *pdev) { struct pci_devres *dr; int rc; dr = get_pci_dr(pdev); if (unlikely(!dr)) return -ENOMEM; if (dr->enabled) return 0; rc = pci_enable_device(pdev); if (!rc) { pdev->is_managed = 1; dr->enabled = 1; } return rc; } /** * pcim_pin_device - Pin managed PCI device * @pdev: PCI device to pin * * Pin managed PCI device @pdev. Pinned device won't be disabled on * driver detach. @pdev must have been enabled with * pcim_enable_device(). */ void pcim_pin_device(struct pci_dev *pdev) { struct pci_devres *dr; dr = find_pci_dr(pdev); WARN_ON(!dr || !dr->enabled); if (dr) dr->pinned = 1; } /** * pcibios_disable_device - disable arch specific PCI resources for device dev * @dev: the PCI device to disable * * Disables architecture specific PCI resources for the device. This * is the default implementation. Architecture implementations can * override this. */ void __attribute__ ((weak)) pcibios_disable_device (struct pci_dev *dev) {} static void do_pci_disable_device(struct pci_dev *dev) { u16 pci_command; pci_read_config_word(dev, PCI_COMMAND, &pci_command); if (pci_command & PCI_COMMAND_MASTER) { pci_command &= ~PCI_COMMAND_MASTER; pci_write_config_word(dev, PCI_COMMAND, pci_command); } pcibios_disable_device(dev); } /** * pci_disable_enabled_device - Disable device without updating enable_cnt * @dev: PCI device to disable * * NOTE: This function is a backend of PCI power management routines and is * not supposed to be called drivers. */ void pci_disable_enabled_device(struct pci_dev *dev) { if (atomic_read(&dev->enable_cnt)) do_pci_disable_device(dev); } /** * pci_disable_device - Disable PCI device after use * @dev: PCI device to be disabled * * Signal to the system that the PCI device is not in use by the system * anymore. This only involves disabling PCI bus-mastering, if active. * * Note we don't actually disable the device until all callers of * pci_device_enable() have called pci_device_disable(). */ void pci_disable_device(struct pci_dev *dev) { struct pci_devres *dr; dr = find_pci_dr(dev); if (dr) dr->enabled = 0; if (atomic_sub_return(1, &dev->enable_cnt) != 0) return; do_pci_disable_device(dev); dev->is_busmaster = 0; } /** * pcibios_set_pcie_reset_state - set reset state for device dev * @dev: the PCI-E device reset * @state: Reset state to enter into * * * Sets the PCI-E reset state for the device. This is the default * implementation. Architecture implementations can override this. */ int __attribute__ ((weak)) pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state) { return -EINVAL; } /** * pci_set_pcie_reset_state - set reset state for device dev * @dev: the PCI-E device reset * @state: Reset state to enter into * * * Sets the PCI reset state for the device. */ int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state) { return pcibios_set_pcie_reset_state(dev, state); } /** * pci_pme_capable - check the capability of PCI device to generate PME# * @dev: PCI device to handle. * @state: PCI state from which device will issue PME#. */ bool pci_pme_capable(struct pci_dev *dev, pci_power_t state) { if (!dev->pm_cap) return false; return !!(dev->pme_support & (1 << state)); } /** * pci_pme_active - enable or disable PCI device's PME# function * @dev: PCI device to handle. * @enable: 'true' to enable PME# generation; 'false' to disable it. * * The caller must verify that the device is capable of generating PME# before * calling this function with @enable equal to 'true'. */ void pci_pme_active(struct pci_dev *dev, bool enable) { u16 pmcsr; if (!dev->pm_cap) return; pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); /* Clear PME_Status by writing 1 to it and enable PME# */ pmcsr |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE; if (!enable) pmcsr &= ~PCI_PM_CTRL_PME_ENABLE; pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); dev_printk(KERN_INFO, &dev->dev, "PME# %s\n", enable ? "enabled" : "disabled"); } /** * pci_enable_wake - enable PCI device as wakeup event source * @dev: PCI device affected * @state: PCI state from which device will issue wakeup events * @enable: True to enable event generation; false to disable * * This enables the device as a wakeup event source, or disables it. * When such events involves platform-specific hooks, those hooks are * called automatically by this routine. * * Devices with legacy power management (no standard PCI PM capabilities) * always require such platform hooks. * * RETURN VALUE: * 0 is returned on success * -EINVAL is returned if device is not supposed to wake up the system * Error code depending on the platform is returned if both the platform and * the native mechanism fail to enable the generation of wake-up events */ int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable) { int error = 0; bool pme_done = false; if (enable && !device_may_wakeup(&dev->dev)) return -EINVAL; /* * According to "PCI System Architecture" 4th ed. by Tom Shanley & Don * Anderson we should be doing PME# wake enable followed by ACPI wake * enable. To disable wake-up we call the platform first, for symmetry. */ if (!enable && platform_pci_can_wakeup(dev)) error = platform_pci_sleep_wake(dev, false); if (!enable || pci_pme_capable(dev, state)) { pci_pme_active(dev, enable); pme_done = true; } if (enable && platform_pci_can_wakeup(dev)) error = platform_pci_sleep_wake(dev, true); return pme_done ? 0 : error; } /** * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold * @dev: PCI device to prepare * @enable: True to enable wake-up event generation; false to disable * * Many drivers want the device to wake up the system from D3_hot or D3_cold * and this function allows them to set that up cleanly - pci_enable_wake() * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI * ordering constraints. * * This function only returns error code if the device is not capable of * generating PME# from both D3_hot and D3_cold, and the platform is unable to * enable wake-up power for it. */ int pci_wake_from_d3(struct pci_dev *dev, bool enable) { return pci_pme_capable(dev, PCI_D3cold) ? pci_enable_wake(dev, PCI_D3cold, enable) : pci_enable_wake(dev, PCI_D3hot, enable); } /** * pci_target_state - find an appropriate low power state for a given PCI dev * @dev: PCI device * * Use underlying platform code to find a supported low power state for @dev. * If the platform can't manage @dev, return the deepest state from which it * can generate wake events, based on any available PME info. */ pci_power_t pci_target_state(struct pci_dev *dev) { pci_power_t target_state = PCI_D3hot; if (platform_pci_power_manageable(dev)) { /* * Call the platform to choose the target state of the device * and enable wake-up from this state if supported. */ pci_power_t state = platform_pci_choose_state(dev); switch (state) { case PCI_POWER_ERROR: case PCI_UNKNOWN: break; case PCI_D1: case PCI_D2: if (pci_no_d1d2(dev)) break; default: target_state = state; } } else if (device_may_wakeup(&dev->dev)) { /* * Find the deepest state from which the device can generate * wake-up events, make it the target state and enable device * to generate PME#. */ if (!dev->pm_cap) return PCI_POWER_ERROR; if (dev->pme_support) { while (target_state && !(dev->pme_support & (1 << target_state))) target_state--; } } return target_state; } /** * pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state * @dev: Device to handle. * * Choose the power state appropriate for the device depending on whether * it can wake up the system and/or is power manageable by the platform * (PCI_D3hot is the default) and put the device into that state. */ int pci_prepare_to_sleep(struct pci_dev *dev) { pci_power_t target_state = pci_target_state(dev); int error; if (target_state == PCI_POWER_ERROR) return -EIO; pci_enable_wake(dev, target_state, true); error = pci_set_power_state(dev, target_state); if (error) pci_enable_wake(dev, target_state, false); return error; } /** * pci_back_from_sleep - turn PCI device on during system-wide transition into working state * @dev: Device to handle. * * Disable device's sytem wake-up capability and put it into D0. */ int pci_back_from_sleep(struct pci_dev *dev) { pci_enable_wake(dev, PCI_D0, false); return pci_set_power_state(dev, PCI_D0); } /** * pci_pm_init - Initialize PM functions of given PCI device * @dev: PCI device to handle. */ void pci_pm_init(struct pci_dev *dev) { int pm; u16 pmc; dev->pm_cap = 0; /* find PCI PM capability in list */ pm = pci_find_capability(dev, PCI_CAP_ID_PM); if (!pm) return; /* Check device's ability to generate PME# */ pci_read_config_word(dev, pm + PCI_PM_PMC, &pmc); if ((pmc & PCI_PM_CAP_VER_MASK) > 3) { dev_err(&dev->dev, "unsupported PM cap regs version (%u)\n", pmc & PCI_PM_CAP_VER_MASK); return; } dev->pm_cap = pm; dev->d1_support = false; dev->d2_support = false; if (!pci_no_d1d2(dev)) { if (pmc & PCI_PM_CAP_D1) dev->d1_support = true; if (pmc & PCI_PM_CAP_D2) dev->d2_support = true; if (dev->d1_support || dev->d2_support) dev_printk(KERN_DEBUG, &dev->dev, "supports%s%s\n", dev->d1_support ? " D1" : "", dev->d2_support ? " D2" : ""); } pmc &= PCI_PM_CAP_PME_MASK; if (pmc) { dev_info(&dev->dev, "PME# supported from%s%s%s%s%s\n", (pmc & PCI_PM_CAP_PME_D0) ? " D0" : "", (pmc & PCI_PM_CAP_PME_D1) ? " D1" : "", (pmc & PCI_PM_CAP_PME_D2) ? " D2" : "", (pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "", (pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : ""); dev->pme_support = pmc >> PCI_PM_CAP_PME_SHIFT; /* * Make device's PM flags reflect the wake-up capability, but * let the user space enable it to wake up the system as needed. */ device_set_wakeup_capable(&dev->dev, true); device_set_wakeup_enable(&dev->dev, false); /* Disable the PME# generation functionality */ pci_pme_active(dev, false); } else { dev->pme_support = 0; } } /** * platform_pci_wakeup_init - init platform wakeup if present * @dev: PCI device * * Some devices don't have PCI PM caps but can still generate wakeup * events through platform methods (like ACPI events). If @dev supports * platform wakeup events, set the device flag to indicate as much. This * may be redundant if the device also supports PCI PM caps, but double * initialization should be safe in that case. */ void platform_pci_wakeup_init(struct pci_dev *dev) { if (!platform_pci_can_wakeup(dev)) return; device_set_wakeup_capable(&dev->dev, true); device_set_wakeup_enable(&dev->dev, false); platform_pci_sleep_wake(dev, false); } /** * pci_add_save_buffer - allocate buffer for saving given capability registers * @dev: the PCI device * @cap: the capability to allocate the buffer for * @size: requested size of the buffer */ static int pci_add_cap_save_buffer( struct pci_dev *dev, char cap, unsigned int size) { int pos; struct pci_cap_saved_state *save_state; pos = pci_find_capability(dev, cap); if (pos <= 0) return 0; save_state = kzalloc(sizeof(*save_state) + size, GFP_KERNEL); if (!save_state) return -ENOMEM; save_state->cap_nr = cap; pci_add_saved_cap(dev, save_state); return 0; } /** * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities * @dev: the PCI device */ void pci_allocate_cap_save_buffers(struct pci_dev *dev) { int error; error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP, 4 * sizeof(u16)); if (error) dev_err(&dev->dev, "unable to preallocate PCI Express save buffer\n"); error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_PCIX, sizeof(u16)); if (error) dev_err(&dev->dev, "unable to preallocate PCI-X save buffer\n"); } /** * pci_restore_standard_config - restore standard config registers of PCI device * @dev: PCI device to handle * * This function assumes that the device's configuration space is accessible. * If the device needs to be powered up, the function will wait for it to * change the state. */ int pci_restore_standard_config(struct pci_dev *dev) { pci_power_t prev_state; int error; pci_update_current_state(dev, PCI_D0); prev_state = dev->current_state; if (prev_state == PCI_D0) goto Restore; error = pci_raw_set_power_state(dev, PCI_D0, false); if (error) return error; /* * This assumes that we won't get a bus in B2 or B3 from the BIOS, but * we've made this assumption forever and it appears to be universally * satisfied. */ switch(prev_state) { case PCI_D3cold: case PCI_D3hot: mdelay(pci_pm_d3_delay); break; case PCI_D2: udelay(PCI_PM_D2_DELAY); break; } pci_update_current_state(dev, PCI_D0); Restore: return dev->state_saved ? pci_restore_state(dev) : 0; } /** * pci_enable_ari - enable ARI forwarding if hardware support it * @dev: the PCI device */ void pci_enable_ari(struct pci_dev *dev) { int pos; u32 cap; u16 ctrl; struct pci_dev *bridge; if (!dev->is_pcie || dev->devfn) return; pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); if (!pos) return; bridge = dev->bus->self; if (!bridge || !bridge->is_pcie) return; pos = pci_find_capability(bridge, PCI_CAP_ID_EXP); if (!pos) return; pci_read_config_dword(bridge, pos + PCI_EXP_DEVCAP2, &cap); if (!(cap & PCI_EXP_DEVCAP2_ARI)) return; pci_read_config_word(bridge, pos + PCI_EXP_DEVCTL2, &ctrl); ctrl |= PCI_EXP_DEVCTL2_ARI; pci_write_config_word(bridge, pos + PCI_EXP_DEVCTL2, ctrl); bridge->ari_enabled = 1; } /** * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge * @dev: the PCI device * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTD, 4=INTD) * * Perform INTx swizzling for a device behind one level of bridge. This is * required by section 9.1 of the PCI-to-PCI bridge specification for devices * behind bridges on add-in cards. */ u8 pci_swizzle_interrupt_pin(struct pci_dev *dev, u8 pin) { return (((pin - 1) + PCI_SLOT(dev->devfn)) % 4) + 1; } int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge) { u8 pin; pin = dev->pin; if (!pin) return -1; while (dev->bus->parent) { pin = pci_swizzle_interrupt_pin(dev, pin); dev = dev->bus->self; } *bridge = dev; return pin; } /** * pci_common_swizzle - swizzle INTx all the way to root bridge * @dev: the PCI device * @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD) * * Perform INTx swizzling for a device. This traverses through all PCI-to-PCI * bridges all the way up to a PCI root bus. */ u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp) { u8 pin = *pinp; while (dev->bus->parent) { pin = pci_swizzle_interrupt_pin(dev, pin); dev = dev->bus->self; } *pinp = pin; return PCI_SLOT(dev->devfn); } /** * pci_release_region - Release a PCI bar * @pdev: PCI device whose resources were previously reserved by pci_request_region * @bar: BAR to release * * Releases the PCI I/O and memory resources previously reserved by a * successful call to pci_request_region. Call this function only * after all use of the PCI regions has ceased. */ void pci_release_region(struct pci_dev *pdev, int bar) { struct pci_devres *dr; if (pci_resource_len(pdev, bar) == 0) return; if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) release_region(pci_resource_start(pdev, bar), pci_resource_len(pdev, bar)); else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) release_mem_region(pci_resource_start(pdev, bar), pci_resource_len(pdev, bar)); dr = find_pci_dr(pdev); if (dr) dr->region_mask &= ~(1 << bar); } /** * __pci_request_region - Reserved PCI I/O and memory resource * @pdev: PCI device whose resources are to be reserved * @bar: BAR to be reserved * @res_name: Name to be associated with resource. * @exclusive: whether the region access is exclusive or not * * Mark the PCI region associated with PCI device @pdev BR @bar as * being reserved by owner @res_name. Do not access any * address inside the PCI regions unless this call returns * successfully. * * If @exclusive is set, then the region is marked so that userspace * is explicitly not allowed to map the resource via /dev/mem or * sysfs MMIO access. * * Returns 0 on success, or %EBUSY on error. A warning * message is also printed on failure. */ static int __pci_request_region(struct pci_dev *pdev, int bar, const char *res_name, int exclusive) { struct pci_devres *dr; if (pci_resource_len(pdev, bar) == 0) return 0; if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) { if (!request_region(pci_resource_start(pdev, bar), pci_resource_len(pdev, bar), res_name)) goto err_out; } else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) { if (!__request_mem_region(pci_resource_start(pdev, bar), pci_resource_len(pdev, bar), res_name, exclusive)) goto err_out; } dr = find_pci_dr(pdev); if (dr) dr->region_mask |= 1 << bar; return 0; err_out: dev_warn(&pdev->dev, "BAR %d: can't reserve %s region %pR\n", bar, pci_resource_flags(pdev, bar) & IORESOURCE_IO ? "I/O" : "mem", &pdev->resource[bar]); return -EBUSY; } /** * pci_request_region - Reserve PCI I/O and memory resource * @pdev: PCI device whose resources are to be reserved * @bar: BAR to be reserved * @res_name: Name to be associated with resource * * Mark the PCI region associated with PCI device @pdev BAR @bar as * being reserved by owner @res_name. Do not access any * address inside the PCI regions unless this call returns * successfully. * * Returns 0 on success, or %EBUSY on error. A warning * message is also printed on failure. */ int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name) { return __pci_request_region(pdev, bar, res_name, 0); } /** * pci_request_region_exclusive - Reserved PCI I/O and memory resource * @pdev: PCI device whose resources are to be reserved * @bar: BAR to be reserved * @res_name: Name to be associated with resource. * * Mark the PCI region associated with PCI device @pdev BR @bar as * being reserved by owner @res_name. Do not access any * address inside the PCI regions unless this call returns * successfully. * * Returns 0 on success, or %EBUSY on error. A warning * message is also printed on failure. * * The key difference that _exclusive makes it that userspace is * explicitly not allowed to map the resource via /dev/mem or * sysfs. */ int pci_request_region_exclusive(struct pci_dev *pdev, int bar, const char *res_name) { return __pci_request_region(pdev, bar, res_name, IORESOURCE_EXCLUSIVE); } /** * pci_release_selected_regions - Release selected PCI I/O and memory resources * @pdev: PCI device whose resources were previously reserved * @bars: Bitmask of BARs to be released * * Release selected PCI I/O and memory resources previously reserved. * Call this function only after all use of the PCI regions has ceased. */ void pci_release_selected_regions(struct pci_dev *pdev, int bars) { int i; for (i = 0; i < 6; i++) if (bars & (1 << i)) pci_release_region(pdev, i); } int __pci_request_selected_regions(struct pci_dev *pdev, int bars, const char *res_name, int excl) { int i; for (i = 0; i < 6; i++) if (bars & (1 << i)) if (__pci_request_region(pdev, i, res_name, excl)) goto err_out; return 0; err_out: while(--i >= 0) if (bars & (1 << i)) pci_release_region(pdev, i); return -EBUSY; } /** * pci_request_selected_regions - Reserve selected PCI I/O and memory resources * @pdev: PCI device whose resources are to be reserved * @bars: Bitmask of BARs to be requested * @res_name: Name to be associated with resource */ int pci_request_selected_regions(struct pci_dev *pdev, int bars, const char *res_name) { return __pci_request_selected_regions(pdev, bars, res_name, 0); } int pci_request_selected_regions_exclusive(struct pci_dev *pdev, int bars, const char *res_name) { return __pci_request_selected_regions(pdev, bars, res_name, IORESOURCE_EXCLUSIVE); } /** * pci_release_regions - Release reserved PCI I/O and memory resources * @pdev: PCI device whose resources were previously reserved by pci_request_regions * * Releases all PCI I/O and memory resources previously reserved by a * successful call to pci_request_regions. Call this function only * after all use of the PCI regions has ceased. */ void pci_release_regions(struct pci_dev *pdev) { pci_release_selected_regions(pdev, (1 << 6) - 1); } /** * pci_request_regions - Reserved PCI I/O and memory resources * @pdev: PCI device whose resources are to be reserved * @res_name: Name to be associated with resource. * * Mark all PCI regions associated with PCI device @pdev as * being reserved by owner @res_name. Do not access any * address inside the PCI regions unless this call returns * successfully. * * Returns 0 on success, or %EBUSY on error. A warning * message is also printed on failure. */ int pci_request_regions(struct pci_dev *pdev, const char *res_name) { return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name); } /** * pci_request_regions_exclusive - Reserved PCI I/O and memory resources * @pdev: PCI device whose resources are to be reserved * @res_name: Name to be associated with resource. * * Mark all PCI regions associated with PCI device @pdev as * being reserved by owner @res_name. Do not access any * address inside the PCI regions unless this call returns * successfully. * * pci_request_regions_exclusive() will mark the region so that * /dev/mem and the sysfs MMIO access will not be allowed. * * Returns 0 on success, or %EBUSY on error. A warning * message is also printed on failure. */ int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name) { return pci_request_selected_regions_exclusive(pdev, ((1 << 6) - 1), res_name); } static void __pci_set_master(struct pci_dev *dev, bool enable) { u16 old_cmd, cmd; pci_read_config_word(dev, PCI_COMMAND, &old_cmd); if (enable) cmd = old_cmd | PCI_COMMAND_MASTER; else cmd = old_cmd & ~PCI_COMMAND_MASTER; if (cmd != old_cmd) { dev_dbg(&dev->dev, "%s bus mastering\n", enable ? "enabling" : "disabling"); pci_write_config_word(dev, PCI_COMMAND, cmd); } dev->is_busmaster = enable; } /** * pci_set_master - enables bus-mastering for device dev * @dev: the PCI device to enable * * Enables bus-mastering on the device and calls pcibios_set_master() * to do the needed arch specific settings. */ void pci_set_master(struct pci_dev *dev) { __pci_set_master(dev, true); pcibios_set_master(dev); } /** * pci_clear_master - disables bus-mastering for device dev * @dev: the PCI device to disable */ void pci_clear_master(struct pci_dev *dev) { __pci_set_master(dev, false); } #ifdef PCI_DISABLE_MWI int pci_set_mwi(struct pci_dev *dev) { return 0; } int pci_try_set_mwi(struct pci_dev *dev) { return 0; } void pci_clear_mwi(struct pci_dev *dev) { } #else #ifndef PCI_CACHE_LINE_BYTES #define PCI_CACHE_LINE_BYTES L1_CACHE_BYTES #endif /* This can be overridden by arch code. */ /* Don't forget this is measured in 32-bit words, not bytes */ u8 pci_cache_line_size = PCI_CACHE_LINE_BYTES / 4; /** * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed * @dev: the PCI device for which MWI is to be enabled * * Helper function for pci_set_mwi. * Originally copied from drivers/net/acenic.c. * Copyright 1998-2001 by Jes Sorensen, . * * RETURNS: An appropriate -ERRNO error value on error, or zero for success. */ static int pci_set_cacheline_size(struct pci_dev *dev) { u8 cacheline_size; if (!pci_cache_line_size) return -EINVAL; /* The system doesn't support MWI. */ /* Validate current setting: the PCI_CACHE_LINE_SIZE must be equal to or multiple of the right value. */ pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); if (cacheline_size >= pci_cache_line_size && (cacheline_size % pci_cache_line_size) == 0) return 0; /* Write the correct value. */ pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size); /* Read it back. */ pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); if (cacheline_size == pci_cache_line_size) return 0; dev_printk(KERN_DEBUG, &dev->dev, "cache line size of %d is not " "supported\n", pci_cache_line_size << 2); return -EINVAL; } /** * pci_set_mwi - enables memory-write-invalidate PCI transaction * @dev: the PCI device for which MWI is enabled * * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. * * RETURNS: An appropriate -ERRNO error value on error, or zero for success. */ int pci_set_mwi(struct pci_dev *dev) { int rc; u16 cmd; rc = pci_set_cacheline_size(dev); if (rc) return rc; pci_read_config_word(dev, PCI_COMMAND, &cmd); if (! (cmd & PCI_COMMAND_INVALIDATE)) { dev_dbg(&dev->dev, "enabling Mem-Wr-Inval\n"); cmd |= PCI_COMMAND_INVALIDATE; pci_write_config_word(dev, PCI_COMMAND, cmd); } return 0; } /** * pci_try_set_mwi - enables memory-write-invalidate PCI transaction * @dev: the PCI device for which MWI is enabled * * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. * Callers are not required to check the return value. * * RETURNS: An appropriate -ERRNO error value on error, or zero for success. */ int pci_try_set_mwi(struct pci_dev *dev) { int rc = pci_set_mwi(dev); return rc; } /** * pci_clear_mwi - disables Memory-Write-Invalidate for device dev * @dev: the PCI device to disable * * Disables PCI Memory-Write-Invalidate transaction on the device */ void pci_clear_mwi(struct pci_dev *dev) { u16 cmd; pci_read_config_word(dev, PCI_COMMAND, &cmd); if (cmd & PCI_COMMAND_INVALIDATE) { cmd &= ~PCI_COMMAND_INVALIDATE; pci_write_config_word(dev, PCI_COMMAND, cmd); } } #endif /* ! PCI_DISABLE_MWI */ /** * pci_intx - enables/disables PCI INTx for device dev * @pdev: the PCI device to operate on * @enable: boolean: whether to enable or disable PCI INTx * * Enables/disables PCI INTx for device dev */ void pci_intx(struct pci_dev *pdev, int enable) { u16 pci_command, new; pci_read_config_word(pdev, PCI_COMMAND, &pci_command); if (enable) { new = pci_command & ~PCI_COMMAND_INTX_DISABLE; } else { new = pci_command | PCI_COMMAND_INTX_DISABLE; } if (new != pci_command) { struct pci_devres *dr; pci_write_config_word(pdev, PCI_COMMAND, new); dr = find_pci_dr(pdev); if (dr && !dr->restore_intx) { dr->restore_intx = 1; dr->orig_intx = !enable; } } } /** * pci_msi_off - disables any msi or msix capabilities * @dev: the PCI device to operate on * * If you want to use msi see pci_enable_msi and friends. * This is a lower level primitive that allows us to disable * msi operation at the device level. */ void pci_msi_off(struct pci_dev *dev) { int pos; u16 control; pos = pci_find_capability(dev, PCI_CAP_ID_MSI); if (pos) { pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control); control &= ~PCI_MSI_FLAGS_ENABLE; pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control); } pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); if (pos) { pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control); control &= ~PCI_MSIX_FLAGS_ENABLE; pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control); } } #ifndef HAVE_ARCH_PCI_SET_DMA_MASK /* * These can be overridden by arch-specific implementations */ int pci_set_dma_mask(struct pci_dev *dev, u64 mask) { if (!pci_dma_supported(dev, mask)) return -EIO; dev->dma_mask = mask; return 0; } int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask) { if (!pci_dma_supported(dev, mask)) return -EIO; dev->dev.coherent_dma_mask = mask; return 0; } #endif #ifndef HAVE_ARCH_PCI_SET_DMA_MAX_SEGMENT_SIZE int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size) { return dma_set_max_seg_size(&dev->dev, size); } EXPORT_SYMBOL(pci_set_dma_max_seg_size); #endif #ifndef HAVE_ARCH_PCI_SET_DMA_SEGMENT_BOUNDARY int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask) { return dma_set_seg_boundary(&dev->dev, mask); } EXPORT_SYMBOL(pci_set_dma_seg_boundary); #endif static int __pcie_flr(struct pci_dev *dev, int probe) { u16 status; u32 cap; int exppos = pci_find_capability(dev, PCI_CAP_ID_EXP); if (!exppos) return -ENOTTY; pci_read_config_dword(dev, exppos + PCI_EXP_DEVCAP, &cap); if (!(cap & PCI_EXP_DEVCAP_FLR)) return -ENOTTY; if (probe) return 0; pci_block_user_cfg_access(dev); /* Wait for Transaction Pending bit clean */ pci_read_config_word(dev, exppos + PCI_EXP_DEVSTA, &status); if (!(status & PCI_EXP_DEVSTA_TRPND)) goto transaction_done; msleep(100); pci_read_config_word(dev, exppos + PCI_EXP_DEVSTA, &status); if (!(status & PCI_EXP_DEVSTA_TRPND)) goto transaction_done; dev_info(&dev->dev, "Busy after 100ms while trying to reset; " "sleeping for 1 second\n"); ssleep(1); pci_read_config_word(dev, exppos + PCI_EXP_DEVSTA, &status); if (status & PCI_EXP_DEVSTA_TRPND) dev_info(&dev->dev, "Still busy after 1s; " "proceeding with reset anyway\n"); transaction_done: pci_write_config_word(dev, exppos + PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR); mdelay(100); pci_unblock_user_cfg_access(dev); return 0; } static int __pci_af_flr(struct pci_dev *dev, int probe) { int cappos = pci_find_capability(dev, PCI_CAP_ID_AF); u8 status; u8 cap; if (!cappos) return -ENOTTY; pci_read_config_byte(dev, cappos + PCI_AF_CAP, &cap); if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR)) return -ENOTTY; if (probe) return 0; pci_block_user_cfg_access(dev); /* Wait for Transaction Pending bit clean */ pci_read_config_byte(dev, cappos + PCI_AF_STATUS, &status); if (!(status & PCI_AF_STATUS_TP)) goto transaction_done; msleep(100); pci_read_config_byte(dev, cappos + PCI_AF_STATUS, &status); if (!(status & PCI_AF_STATUS_TP)) goto transaction_done; dev_info(&dev->dev, "Busy after 100ms while trying to" " reset; sleeping for 1 second\n"); ssleep(1); pci_read_config_byte(dev, cappos + PCI_AF_STATUS, &status); if (status & PCI_AF_STATUS_TP) dev_info(&dev->dev, "Still busy after 1s; " "proceeding with reset anyway\n"); transaction_done: pci_write_config_byte(dev, cappos + PCI_AF_CTRL, PCI_AF_CTRL_FLR); mdelay(100); pci_unblock_user_cfg_access(dev); return 0; } static int __pci_reset_function(struct pci_dev *pdev, int probe) { int res; res = __pcie_flr(pdev, probe); if (res != -ENOTTY) return res; res = __pci_af_flr(pdev, probe); if (res != -ENOTTY) return res; return res; } /** * pci_execute_reset_function() - Reset a PCI device function * @dev: Device function to reset * * Some devices allow an individual function to be reset without affecting * other functions in the same device. The PCI device must be responsive * to PCI config space in order to use this function. * * The device function is presumed to be unused when this function is called. * Resetting the device will make the contents of PCI configuration space * random, so any caller of this must be prepared to reinitialise the * device including MSI, bus mastering, BARs, decoding IO and memory spaces, * etc. * * Returns 0 if the device function was successfully reset or -ENOTTY if the * device doesn't support resetting a single function. */ int pci_execute_reset_function(struct pci_dev *dev) { return __pci_reset_function(dev, 0); } EXPORT_SYMBOL_GPL(pci_execute_reset_function); /** * pci_reset_function() - quiesce and reset a PCI device function * @dev: Device function to reset * * Some devices allow an individual function to be reset without affecting * other functions in the same device. The PCI device must be responsive * to PCI config space in order to use this function. * * This function does not just reset the PCI portion of a device, but * clears all the state associated with the device. This function differs * from pci_execute_reset_function in that it saves and restores device state * over the reset. * * Returns 0 if the device function was successfully reset or -ENOTTY if the * device doesn't support resetting a single function. */ int pci_reset_function(struct pci_dev *dev) { int r = __pci_reset_function(dev, 1); if (r < 0) return r; if (!dev->msi_enabled && !dev->msix_enabled && dev->irq != 0) disable_irq(dev->irq); pci_save_state(dev); pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); r = pci_execute_reset_function(dev); pci_restore_state(dev); if (!dev->msi_enabled && !dev->msix_enabled && dev->irq != 0) enable_irq(dev->irq); return r; } EXPORT_SYMBOL_GPL(pci_reset_function); /** * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count * @dev: PCI device to query * * Returns mmrbc: maximum designed memory read count in bytes * or appropriate error value. */ int pcix_get_max_mmrbc(struct pci_dev *dev) { int err, cap; u32 stat; cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); if (!cap) return -EINVAL; err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat); if (err) return -EINVAL; return (stat & PCI_X_STATUS_MAX_READ) >> 12; } EXPORT_SYMBOL(pcix_get_max_mmrbc); /** * pcix_get_mmrbc - get PCI-X maximum memory read byte count * @dev: PCI device to query * * Returns mmrbc: maximum memory read count in bytes * or appropriate error value. */ int pcix_get_mmrbc(struct pci_dev *dev) { int ret, cap; u32 cmd; cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); if (!cap) return -EINVAL; ret = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd); if (!ret) ret = 512 << ((cmd & PCI_X_CMD_MAX_READ) >> 2); return ret; } EXPORT_SYMBOL(pcix_get_mmrbc); /** * pcix_set_mmrbc - set PCI-X maximum memory read byte count * @dev: PCI device to query * @mmrbc: maximum memory read count in bytes * valid values are 512, 1024, 2048, 4096 * * If possible sets maximum memory read byte count, some bridges have erratas * that prevent this. */ int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc) { int cap, err = -EINVAL; u32 stat, cmd, v, o; if (mmrbc < 512 || mmrbc > 4096 || !is_power_of_2(mmrbc)) goto out; v = ffs(mmrbc) - 10; cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); if (!cap) goto out; err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat); if (err) goto out; if (v > (stat & PCI_X_STATUS_MAX_READ) >> 21) return -E2BIG; err = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd); if (err) goto out; o = (cmd & PCI_X_CMD_MAX_READ) >> 2; if (o != v) { if (v > o && dev->bus && (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MMRBC)) return -EIO; cmd &= ~PCI_X_CMD_MAX_READ; cmd |= v << 2; err = pci_write_config_dword(dev, cap + PCI_X_CMD, cmd); } out: return err; } EXPORT_SYMBOL(pcix_set_mmrbc); /** * pcie_get_readrq - get PCI Express read request size * @dev: PCI device to query * * Returns maximum memory read request in bytes * or appropriate error value. */ int pcie_get_readrq(struct pci_dev *dev) { int ret, cap; u16 ctl; cap = pci_find_capability(dev, PCI_CAP_ID_EXP); if (!cap) return -EINVAL; ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl); if (!ret) ret = 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12); return ret; } EXPORT_SYMBOL(pcie_get_readrq); /** * pcie_set_readrq - set PCI Express maximum memory read request * @dev: PCI device to query * @rq: maximum memory read count in bytes * valid values are 128, 256, 512, 1024, 2048, 4096 * * If possible sets maximum read byte count */ int pcie_set_readrq(struct pci_dev *dev, int rq) { int cap, err = -EINVAL; u16 ctl, v; if (rq < 128 || rq > 4096 || !is_power_of_2(rq)) goto out; v = (ffs(rq) - 8) << 12; cap = pci_find_capability(dev, PCI_CAP_ID_EXP); if (!cap) goto out; err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl); if (err) goto out; if ((ctl & PCI_EXP_DEVCTL_READRQ) != v) { ctl &= ~PCI_EXP_DEVCTL_READRQ; ctl |= v; err = pci_write_config_dword(dev, cap + PCI_EXP_DEVCTL, ctl); } out: return err; } EXPORT_SYMBOL(pcie_set_readrq); /** * pci_select_bars - Make BAR mask from the type of resource * @dev: the PCI device for which BAR mask is made * @flags: resource type mask to be selected * * This helper routine makes bar mask from the type of resource. */ int pci_select_bars(struct pci_dev *dev, unsigned long flags) { int i, bars = 0; for (i = 0; i < PCI_NUM_RESOURCES; i++) if (pci_resource_flags(dev, i) & flags) bars |= (1 << i); return bars; } /** * pci_resource_bar - get position of the BAR associated with a resource * @dev: the PCI device * @resno: the resource number * @type: the BAR type to be filled in * * Returns BAR position in config space, or 0 if the BAR is invalid. */ int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type) { if (resno < PCI_ROM_RESOURCE) { *type = pci_bar_unknown; return PCI_BASE_ADDRESS_0 + 4 * resno; } else if (resno == PCI_ROM_RESOURCE) { *type = pci_bar_mem32; return dev->rom_base_reg; } dev_err(&dev->dev, "BAR: invalid resource #%d\n", resno); return 0; } static void __devinit pci_no_domains(void) { #ifdef CONFIG_PCI_DOMAINS pci_domains_supported = 0; #endif } /** * pci_ext_cfg_enabled - can we access extended PCI config space? * @dev: The PCI device of the root bridge. * * Returns 1 if we can access PCI extended config space (offsets * greater than 0xff). This is the default implementation. Architecture * implementations can override this. */ int __attribute__ ((weak)) pci_ext_cfg_avail(struct pci_dev *dev) { return 1; } static int __devinit pci_init(void) { struct pci_dev *dev = NULL; while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { pci_fixup_device(pci_fixup_final, dev); } return 0; } static int __init pci_setup(char *str) { while (str) { char *k = strchr(str, ','); if (k) *k++ = 0; if (*str && (str = pcibios_setup(str)) && *str) { if (!strcmp(str, "nomsi")) { pci_no_msi(); } else if (!strcmp(str, "noaer")) { pci_no_aer(); } else if (!strcmp(str, "nodomains")) { pci_no_domains(); } else if (!strncmp(str, "cbiosize=", 9)) { pci_cardbus_io_size = memparse(str + 9, &str); } else if (!strncmp(str, "cbmemsize=", 10)) { pci_cardbus_mem_size = memparse(str + 10, &str); } else { printk(KERN_ERR "PCI: Unknown option `%s'\n", str); } } str = k; } return 0; } early_param("pci", pci_setup); device_initcall(pci_init); EXPORT_SYMBOL(pci_reenable_device); EXPORT_SYMBOL(pci_enable_device_io); EXPORT_SYMBOL(pci_enable_device_mem); EXPORT_SYMBOL(pci_enable_device); EXPORT_SYMBOL(pcim_enable_device); EXPORT_SYMBOL(pcim_pin_device); EXPORT_SYMBOL(pci_disable_device); EXPORT_SYMBOL(pci_find_capability); EXPORT_SYMBOL(pci_bus_find_capability); EXPORT_SYMBOL(pci_release_regions); EXPORT_SYMBOL(pci_request_regions); EXPORT_SYMBOL(pci_request_regions_exclusive); EXPORT_SYMBOL(pci_release_region); EXPORT_SYMBOL(pci_request_region); EXPORT_SYMBOL(pci_request_region_exclusive); EXPORT_SYMBOL(pci_release_selected_regions); EXPORT_SYMBOL(pci_request_selected_regions); EXPORT_SYMBOL(pci_request_selected_regions_exclusive); EXPORT_SYMBOL(pci_set_master); EXPORT_SYMBOL(pci_clear_master); EXPORT_SYMBOL(pci_set_mwi); EXPORT_SYMBOL(pci_try_set_mwi); EXPORT_SYMBOL(pci_clear_mwi); EXPORT_SYMBOL_GPL(pci_intx); EXPORT_SYMBOL(pci_set_dma_mask); EXPORT_SYMBOL(pci_set_consistent_dma_mask); EXPORT_SYMBOL(pci_assign_resource); EXPORT_SYMBOL(pci_find_parent_resource); EXPORT_SYMBOL(pci_select_bars); EXPORT_SYMBOL(pci_set_power_state); EXPORT_SYMBOL(pci_save_state); EXPORT_SYMBOL(pci_restore_state); EXPORT_SYMBOL(pci_pme_capable); EXPORT_SYMBOL(pci_pme_active); EXPORT_SYMBOL(pci_enable_wake); EXPORT_SYMBOL(pci_wake_from_d3); EXPORT_SYMBOL(pci_target_state); EXPORT_SYMBOL(pci_prepare_to_sleep); EXPORT_SYMBOL(pci_back_from_sleep); EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);