| /* |
| * 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 <mj@ucw.cz> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/pci.h> |
| #include <linux/pm.h> |
| #include <linux/module.h> |
| #include <linux/spinlock.h> |
| #include <linux/string.h> |
| #include <linux/log2.h> |
| #include <linux/pci-aspm.h> |
| #include <linux/pm_wakeup.h> |
| #include <linux/interrupt.h> |
| #include <asm/dma.h> /* isa_dma_bridge_buggy */ |
| #include <linux/device.h> |
| #include <asm/setup.h> |
| #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); |
| pci_restore_iov_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, <jes@trained-monkey.org>. |
| * |
| * 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) |
| { |
| int reg; |
| |
| 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; |
| } else if (resno < PCI_BRIDGE_RESOURCES) { |
| /* device specific resource */ |
| reg = pci_iov_resource_bar(dev, resno, type); |
| if (reg) |
| return reg; |
| } |
| |
| dev_err(&dev->dev, "BAR: invalid resource #%d\n", resno); |
| return 0; |
| } |
| |
| #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE |
| static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0}; |
| spinlock_t resource_alignment_lock = SPIN_LOCK_UNLOCKED; |
| |
| /** |
| * pci_specified_resource_alignment - get resource alignment specified by user. |
| * @dev: the PCI device to get |
| * |
| * RETURNS: Resource alignment if it is specified. |
| * Zero if it is not specified. |
| */ |
| resource_size_t pci_specified_resource_alignment(struct pci_dev *dev) |
| { |
| int seg, bus, slot, func, align_order, count; |
| resource_size_t align = 0; |
| char *p; |
| |
| spin_lock(&resource_alignment_lock); |
| p = resource_alignment_param; |
| while (*p) { |
| count = 0; |
| if (sscanf(p, "%d%n", &align_order, &count) == 1 && |
| p[count] == '@') { |
| p += count + 1; |
| } else { |
| align_order = -1; |
| } |
| if (sscanf(p, "%x:%x:%x.%x%n", |
| &seg, &bus, &slot, &func, &count) != 4) { |
| seg = 0; |
| if (sscanf(p, "%x:%x.%x%n", |
| &bus, &slot, &func, &count) != 3) { |
| /* Invalid format */ |
| printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: %s\n", |
| p); |
| break; |
| } |
| } |
| p += count; |
| if (seg == pci_domain_nr(dev->bus) && |
| bus == dev->bus->number && |
| slot == PCI_SLOT(dev->devfn) && |
| func == PCI_FUNC(dev->devfn)) { |
| if (align_order == -1) { |
| align = PAGE_SIZE; |
| } else { |
| align = 1 << align_order; |
| } |
| /* Found */ |
| break; |
| } |
| if (*p != ';' && *p != ',') { |
| /* End of param or invalid format */ |
| break; |
| } |
| p++; |
| } |
| spin_unlock(&resource_alignment_lock); |
| return align; |
| } |
| |
| /** |
| * pci_is_reassigndev - check if specified PCI is target device to reassign |
| * @dev: the PCI device to check |
| * |
| * RETURNS: non-zero for PCI device is a target device to reassign, |
| * or zero is not. |
| */ |
| int pci_is_reassigndev(struct pci_dev *dev) |
| { |
| return (pci_specified_resource_alignment(dev) != 0); |
| } |
| |
| ssize_t pci_set_resource_alignment_param(const char *buf, size_t count) |
| { |
| if (count > RESOURCE_ALIGNMENT_PARAM_SIZE - 1) |
| count = RESOURCE_ALIGNMENT_PARAM_SIZE - 1; |
| spin_lock(&resource_alignment_lock); |
| strncpy(resource_alignment_param, buf, count); |
| resource_alignment_param[count] = '\0'; |
| spin_unlock(&resource_alignment_lock); |
| return count; |
| } |
| |
| ssize_t pci_get_resource_alignment_param(char *buf, size_t size) |
| { |
| size_t count; |
| spin_lock(&resource_alignment_lock); |
| count = snprintf(buf, size, "%s", resource_alignment_param); |
| spin_unlock(&resource_alignment_lock); |
| return count; |
| } |
| |
| static ssize_t pci_resource_alignment_show(struct bus_type *bus, char *buf) |
| { |
| return pci_get_resource_alignment_param(buf, PAGE_SIZE); |
| } |
| |
| static ssize_t pci_resource_alignment_store(struct bus_type *bus, |
| const char *buf, size_t count) |
| { |
| return pci_set_resource_alignment_param(buf, count); |
| } |
| |
| BUS_ATTR(resource_alignment, 0644, pci_resource_alignment_show, |
| pci_resource_alignment_store); |
| |
| static int __init pci_resource_alignment_sysfs_init(void) |
| { |
| return bus_create_file(&pci_bus_type, |
| &bus_attr_resource_alignment); |
| } |
| |
| late_initcall(pci_resource_alignment_sysfs_init); |
| |
| 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 if (!strncmp(str, "resource_alignment=", 19)) { |
| pci_set_resource_alignment_param(str + 19, |
| strlen(str + 19)); |
| } 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); |
| |