pci.c
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上传日期:2013-04-10
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文件大小:58k
- /*
- * $Id: pci.c,v 1.91 1999/01/21 13:34:01 davem Exp $
- *
- * 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/config.h>
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/pci.h>
- #include <linux/string.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/ioport.h>
- #include <linux/spinlock.h>
- #include <linux/pm.h>
- #include <linux/kmod.h> /* for hotplug_path */
- #include <linux/bitops.h>
- #include <linux/delay.h>
- #include <linux/cache.h>
- #include <asm/page.h>
- #include <asm/dma.h> /* isa_dma_bridge_buggy */
- #undef DEBUG
- #ifdef DEBUG
- #define DBG(x...) printk(x)
- #else
- #define DBG(x...)
- #endif
- LIST_HEAD(pci_root_buses);
- LIST_HEAD(pci_devices);
- /**
- * pci_find_slot - locate PCI device from a given PCI slot
- * @bus: number of PCI bus on which desired PCI device resides
- * @devfn: encodes number of PCI slot in which the desired PCI
- * device resides and the logical device number within that slot
- * in case of multi-function devices.
- *
- * Given a PCI bus and slot/function number, the desired PCI device
- * is located in system global list of PCI devices. If the device
- * is found, a pointer to its data structure is returned. If no
- * device is found, %NULL is returned.
- */
- struct pci_dev *
- pci_find_slot(unsigned int bus, unsigned int devfn)
- {
- struct pci_dev *dev;
- pci_for_each_dev(dev) {
- if (dev->bus->number == bus && dev->devfn == devfn)
- return dev;
- }
- return NULL;
- }
- /**
- * pci_find_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice id
- * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids
- * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids
- * @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids
- * @ss_device: PCI subsystem device id to match, or %PCI_ANY_ID to match all device ids
- * @from: Previous PCI device found in search, or %NULL for new search.
- *
- * Iterates through the list of known PCI devices. If a PCI device is
- * found with a matching @vendor, @device, @ss_vendor and @ss_device, a pointer to its
- * device structure is returned. Otherwise, %NULL is returned.
- * A new search is initiated by passing %NULL to the @from argument.
- * Otherwise if @from is not %NULL, searches continue from next device on the global list.
- */
- struct pci_dev *
- pci_find_subsys(unsigned int vendor, unsigned int device,
- unsigned int ss_vendor, unsigned int ss_device,
- const struct pci_dev *from)
- {
- struct list_head *n = from ? from->global_list.next : pci_devices.next;
- while (n != &pci_devices) {
- struct pci_dev *dev = pci_dev_g(n);
- if ((vendor == PCI_ANY_ID || dev->vendor == vendor) &&
- (device == PCI_ANY_ID || dev->device == device) &&
- (ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) &&
- (ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device))
- return dev;
- n = n->next;
- }
- return NULL;
- }
- /**
- * pci_find_device - begin or continue searching for a PCI device by vendor/device id
- * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids
- * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids
- * @from: Previous PCI device found in search, or %NULL for new search.
- *
- * Iterates through the list of known PCI devices. If a PCI device is
- * found with a matching @vendor and @device, a pointer to its device structure is
- * returned. Otherwise, %NULL is returned.
- * A new search is initiated by passing %NULL to the @from argument.
- * Otherwise if @from is not %NULL, searches continue from next device on the global list.
- */
- struct pci_dev *
- pci_find_device(unsigned int vendor, unsigned int device, const struct pci_dev *from)
- {
- return pci_find_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from);
- }
- /**
- * pci_find_class - begin or continue searching for a PCI device by class
- * @class: search for a PCI device with this class designation
- * @from: Previous PCI device found in search, or %NULL for new search.
- *
- * Iterates through the list of known PCI devices. If a PCI device is
- * found with a matching @class, a pointer to its device structure is
- * returned. Otherwise, %NULL is returned.
- * A new search is initiated by passing %NULL to the @from argument.
- * Otherwise if @from is not %NULL, searches continue from next device
- * on the global list.
- */
- struct pci_dev *
- pci_find_class(unsigned int class, const struct pci_dev *from)
- {
- struct list_head *n = from ? from->global_list.next : pci_devices.next;
- while (n != &pci_devices) {
- struct pci_dev *dev = pci_dev_g(n);
- if (dev->class == class)
- return dev;
- n = n->next;
- }
- return NULL;
- }
- /**
- * 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
- */
- int
- pci_find_capability(struct pci_dev *dev, int cap)
- {
- u16 status;
- u8 pos, id;
- int ttl = 48;
- pci_read_config_word(dev, PCI_STATUS, &status);
- if (!(status & PCI_STATUS_CAP_LIST))
- return 0;
- switch (dev->hdr_type) {
- case PCI_HEADER_TYPE_NORMAL:
- case PCI_HEADER_TYPE_BRIDGE:
- pci_read_config_byte(dev, PCI_CAPABILITY_LIST, &pos);
- break;
- case PCI_HEADER_TYPE_CARDBUS:
- pci_read_config_byte(dev, PCI_CB_CAPABILITY_LIST, &pos);
- break;
- default:
- return 0;
- }
- while (ttl-- && pos >= 0x40) {
- pos &= ~3;
- pci_read_config_byte(dev, pos + PCI_CAP_LIST_ID, &id);
- if (id == 0xff)
- break;
- if (id == cap)
- return pos;
- pci_read_config_byte(dev, pos + PCI_CAP_LIST_NEXT, &pos);
- }
- return 0;
- }
- /**
- * 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<4; 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_set_power_state - Set the power state of a PCI device
- * @dev: PCI device to be suspended
- * @state: Power state we're entering
- *
- * Transition a device to a new power state, using the Power Management
- * Capabilities in the device's config space.
- *
- * RETURN VALUE:
- * -EINVAL if trying to enter a lower state than we're already in.
- * 0 if we're already in the requested state.
- * -EIO if device does not support PCI PM.
- * 0 if we can successfully change the power state.
- */
- int
- pci_set_power_state(struct pci_dev *dev, int state)
- {
- int pm;
- u16 pmcsr;
- /* bound the state we're entering */
- if (state > 3) state = 3;
- /* 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 (state > 0 && dev->current_state > state)
- return -EINVAL;
- else if (dev->current_state == state)
- return 0; /* we're already there */
- /* find PCI PM capability in list */
- pm = pci_find_capability(dev, PCI_CAP_ID_PM);
-
- /* abort if the device doesn't support PM capabilities */
- if (!pm) return -EIO;
- /* check if this device supports the desired state */
- if (state == 1 || state == 2) {
- u16 pmc;
- pci_read_config_word(dev,pm + PCI_PM_PMC,&pmc);
- if (state == 1 && !(pmc & PCI_PM_CAP_D1)) return -EIO;
- else if (state == 2 && !(pmc & PCI_PM_CAP_D2)) return -EIO;
- }
- /* If we're in D3, force entire word to 0.
- * This doesn't affect PME_Status, disables PME_En, and
- * sets PowerState to 0.
- */
- if (dev->current_state >= 3)
- pmcsr = 0;
- else {
- pci_read_config_word(dev, pm + PCI_PM_CTRL, &pmcsr);
- pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
- pmcsr |= state;
- }
- /* enter specified state */
- pci_write_config_word(dev, pm + PCI_PM_CTRL, pmcsr);
- /* Mandatory power management transition delays */
- /* see PCI PM 1.1 5.6.1 table 18 */
- if(state == 3 || dev->current_state == 3)
- {
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(HZ/100);
- }
- else if(state == 2 || dev->current_state == 2)
- udelay(200);
- dev->current_state = state;
- return 0;
- }
- /**
- * pci_save_state - save the PCI configuration space of a device before suspending
- * @dev: - PCI device that we're dealing with
- * @buffer: - buffer to hold config space context
- *
- * @buffer must be large enough to hold the entire PCI 2.2 config space
- * (>= 64 bytes).
- */
- int
- pci_save_state(struct pci_dev *dev, u32 *buffer)
- {
- int i;
- if (buffer) {
- /* XXX: 100% dword access ok here? */
- for (i = 0; i < 16; i++)
- pci_read_config_dword(dev, i * 4,&buffer[i]);
- }
- return 0;
- }
- /**
- * pci_restore_state - Restore the saved state of a PCI device
- * @dev: - PCI device that we're dealing with
- * @buffer: - saved PCI config space
- *
- */
- int
- pci_restore_state(struct pci_dev *dev, u32 *buffer)
- {
- int i;
- if (buffer) {
- for (i = 0; i < 16; i++)
- pci_write_config_dword(dev,i * 4, buffer[i]);
- }
- /*
- * otherwise, write the context information we know from bootup.
- * This works around a problem where warm-booting from Windows
- * combined with a D3(hot)->D0 transition causes PCI config
- * header data to be forgotten.
- */
- else {
- for (i = 0; i < 6; i ++)
- pci_write_config_dword(dev,
- PCI_BASE_ADDRESS_0 + (i * 4),
- dev->resource[i].start);
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
- }
- return 0;
- }
- /**
- * pci_enable_device_bars - Initialize some of a device for use
- * @dev: PCI device to be initialized
- * @bars: bitmask of BAR's that must be configured
- *
- * Initialize device before it's used by a driver. Ask low-level code
- * to enable selected I/O and memory resources. Wake up the device if it
- * was suspended. Beware, this function can fail.
- */
-
- int
- pci_enable_device_bars(struct pci_dev *dev, int bars)
- {
- int err;
- pci_set_power_state(dev, 0);
- if ((err = pcibios_enable_device(dev, bars)) < 0)
- return err;
- return 0;
- }
- /**
- * 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.
- */
- int
- pci_enable_device(struct pci_dev *dev)
- {
- return pci_enable_device_bars(dev, 0x3F);
- }
- /**
- * 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.
- */
- void
- 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);
- }
- }
- /**
- * pci_enable_wake - enable device to generate PME# when suspended
- * @dev: - PCI device to operate on
- * @state: - Current state of device.
- * @enable: - Flag to enable or disable generation
- *
- * Set the bits in the device's PM Capabilities to generate PME# when
- * the system is suspended.
- *
- * -EIO is returned if device doesn't have PM Capabilities.
- * -EINVAL is returned if device supports it, but can't generate wake events.
- * 0 if operation is successful.
- *
- */
- int pci_enable_wake(struct pci_dev *dev, u32 state, int enable)
- {
- int pm;
- u16 value;
- /* find PCI PM capability in list */
- pm = pci_find_capability(dev, PCI_CAP_ID_PM);
- /* If device doesn't support PM Capabilities, but request is to disable
- * wake events, it's a nop; otherwise fail */
- if (!pm)
- return enable ? -EIO : 0;
- /* Check device's ability to generate PME# */
- pci_read_config_word(dev,pm+PCI_PM_PMC,&value);
- value &= PCI_PM_CAP_PME_MASK;
- value >>= ffs(value); /* First bit of mask */
- /* Check if it can generate PME# from requested state. */
- if (!value || !(value & (1 << state)))
- return enable ? -EINVAL : 0;
- pci_read_config_word(dev, pm + PCI_PM_CTRL, &value);
- /* Clear PME_Status by writing 1 to it and enable PME# */
- value |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE;
- if (!enable)
- value &= ~PCI_PM_CTRL_PME_ENABLE;
- pci_write_config_word(dev, pm + PCI_PM_CTRL, value);
-
- return 0;
- }
- int
- pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
- {
- u8 pin;
- pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
- if (!pin)
- return -1;
- pin--;
- while (dev->bus->self) {
- pin = (pin + PCI_SLOT(dev->devfn)) % 4;
- dev = dev->bus->self;
- }
- *bridge = dev;
- return pin;
- }
- /**
- * 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)
- {
- 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));
- }
- /**
- * 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.
- *
- * 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.
- */
- int pci_request_region(struct pci_dev *pdev, int bar, char *res_name)
- {
- 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))
- goto err_out;
- }
-
- return 0;
- err_out:
- printk (KERN_WARNING "PCI: Unable to reserve %s region #%d:%lx@%lx for device %sn",
- pci_resource_flags(pdev, bar) & IORESOURCE_IO ? "I/O" : "mem",
- bar + 1, /* PCI BAR # */
- pci_resource_len(pdev, bar), pci_resource_start(pdev, bar),
- pdev->slot_name);
- return -EBUSY;
- }
- /**
- * 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)
- {
- int i;
-
- for (i = 0; i < 6; i++)
- pci_release_region(pdev, i);
- }
- /**
- * 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, char *res_name)
- {
- int i;
-
- for (i = 0; i < 6; i++)
- if(pci_request_region(pdev, i, res_name))
- goto err_out;
- return 0;
- err_out:
- printk (KERN_WARNING "PCI: Unable to reserve %s region #%d:%lx@%lx for device %sn",
- pci_resource_flags(pdev, i) & IORESOURCE_IO ? "I/O" : "mem",
- i + 1, /* PCI BAR # */
- pci_resource_len(pdev, i), pci_resource_start(pdev, i),
- pdev->slot_name);
- while(--i >= 0)
- pci_release_region(pdev, i);
-
- return -EBUSY;
- }
- /*
- * Registration of PCI drivers and handling of hot-pluggable devices.
- */
- static LIST_HEAD(pci_drivers);
- /**
- * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
- * @ids: array of PCI device id structures to search in
- * @dev: the PCI device structure to match against
- *
- * Used by a driver to check whether a PCI device present in the
- * system is in its list of supported devices.Returns the matching
- * pci_device_id structure or %NULL if there is no match.
- */
- const struct pci_device_id *
- pci_match_device(const struct pci_device_id *ids, const struct pci_dev *dev)
- {
- while (ids->vendor || ids->subvendor || ids->class_mask) {
- if ((ids->vendor == PCI_ANY_ID || ids->vendor == dev->vendor) &&
- (ids->device == PCI_ANY_ID || ids->device == dev->device) &&
- (ids->subvendor == PCI_ANY_ID || ids->subvendor == dev->subsystem_vendor) &&
- (ids->subdevice == PCI_ANY_ID || ids->subdevice == dev->subsystem_device) &&
- !((ids->class ^ dev->class) & ids->class_mask))
- return ids;
- ids++;
- }
- return NULL;
- }
- static int
- pci_announce_device(struct pci_driver *drv, struct pci_dev *dev)
- {
- const struct pci_device_id *id;
- int ret = 0;
- if (drv->id_table) {
- id = pci_match_device(drv->id_table, dev);
- if (!id) {
- ret = 0;
- goto out;
- }
- } else
- id = NULL;
- dev_probe_lock();
- if (drv->probe(dev, id) >= 0) {
- dev->driver = drv;
- ret = 1;
- }
- dev_probe_unlock();
- out:
- return ret;
- }
- /**
- * pci_register_driver - register a new pci driver
- * @drv: the driver structure to register
- *
- * Adds the driver structure to the list of registered drivers
- * Returns the number of pci devices which were claimed by the driver
- * during registration. The driver remains registered even if the
- * return value is zero.
- */
- int
- pci_register_driver(struct pci_driver *drv)
- {
- struct pci_dev *dev;
- int count = 0;
- list_add_tail(&drv->node, &pci_drivers);
- pci_for_each_dev(dev) {
- if (!pci_dev_driver(dev))
- count += pci_announce_device(drv, dev);
- }
- return count;
- }
- /**
- * pci_unregister_driver - unregister a pci driver
- * @drv: the driver structure to unregister
- *
- * Deletes the driver structure from the list of registered PCI drivers,
- * gives it a chance to clean up by calling its remove() function for
- * each device it was responsible for, and marks those devices as
- * driverless.
- */
- void
- pci_unregister_driver(struct pci_driver *drv)
- {
- struct pci_dev *dev;
- list_del(&drv->node);
- pci_for_each_dev(dev) {
- if (dev->driver == drv) {
- if (drv->remove)
- drv->remove(dev);
- dev->driver = NULL;
- }
- }
- }
- #ifdef CONFIG_HOTPLUG
- #ifndef FALSE
- #define FALSE (0)
- #define TRUE (!FALSE)
- #endif
- static void
- run_sbin_hotplug(struct pci_dev *pdev, int insert)
- {
- int i;
- char *argv[3], *envp[8];
- char id[20], sub_id[24], bus_id[24], class_id[20];
- if (!hotplug_path[0])
- return;
- sprintf(class_id, "PCI_CLASS=%04X", pdev->class);
- sprintf(id, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device);
- sprintf(sub_id, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor, pdev->subsystem_device);
- sprintf(bus_id, "PCI_SLOT_NAME=%s", pdev->slot_name);
- i = 0;
- argv[i++] = hotplug_path;
- argv[i++] = "pci";
- argv[i] = 0;
- i = 0;
- /* minimal command environment */
- envp[i++] = "HOME=/";
- envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
-
- /* other stuff we want to pass to /sbin/hotplug */
- envp[i++] = class_id;
- envp[i++] = id;
- envp[i++] = sub_id;
- envp[i++] = bus_id;
- if (insert)
- envp[i++] = "ACTION=add";
- else
- envp[i++] = "ACTION=remove";
- envp[i] = 0;
- call_usermodehelper (argv [0], argv, envp);
- }
- /**
- * pci_announce_device_to_drivers - tell the drivers a new device has appeared
- * @dev: the device that has shown up
- *
- * Notifys the drivers that a new device has appeared, and also notifys
- * userspace through /sbin/hotplug.
- */
- void
- pci_announce_device_to_drivers(struct pci_dev *dev)
- {
- struct list_head *ln;
- for(ln=pci_drivers.next; ln != &pci_drivers; ln=ln->next) {
- struct pci_driver *drv = list_entry(ln, struct pci_driver, node);
- if (drv->remove && pci_announce_device(drv, dev))
- break;
- }
- /* notify userspace of new hotplug device */
- run_sbin_hotplug(dev, TRUE);
- }
- /**
- * pci_insert_device - insert a hotplug device
- * @dev: the device to insert
- * @bus: where to insert it
- *
- * Add a new device to the device lists and notify userspace (/sbin/hotplug).
- */
- void
- pci_insert_device(struct pci_dev *dev, struct pci_bus *bus)
- {
- list_add_tail(&dev->bus_list, &bus->devices);
- list_add_tail(&dev->global_list, &pci_devices);
- #ifdef CONFIG_PROC_FS
- pci_proc_attach_device(dev);
- #endif
- pci_announce_device_to_drivers(dev);
- }
- static void
- pci_free_resources(struct pci_dev *dev)
- {
- int i;
- for (i = 0; i < PCI_NUM_RESOURCES; i++) {
- struct resource *res = dev->resource + i;
- if (res->parent)
- release_resource(res);
- }
- }
- /**
- * pci_remove_device - remove a hotplug device
- * @dev: the device to remove
- *
- * Delete the device structure from the device lists and
- * notify userspace (/sbin/hotplug).
- */
- void
- pci_remove_device(struct pci_dev *dev)
- {
- if (dev->driver) {
- if (dev->driver->remove)
- dev->driver->remove(dev);
- dev->driver = NULL;
- }
- list_del(&dev->bus_list);
- list_del(&dev->global_list);
- pci_free_resources(dev);
- #ifdef CONFIG_PROC_FS
- pci_proc_detach_device(dev);
- #endif
- /* notify userspace of hotplug device removal */
- run_sbin_hotplug(dev, FALSE);
- }
- #endif
- static struct pci_driver pci_compat_driver = {
- name: "compat"
- };
- /**
- * pci_dev_driver - get the pci_driver of a device
- * @dev: the device to query
- *
- * Returns the appropriate pci_driver structure or %NULL if there is no
- * registered driver for the device.
- */
- struct pci_driver *
- pci_dev_driver(const struct pci_dev *dev)
- {
- if (dev->driver)
- return dev->driver;
- else {
- int i;
- for(i=0; i<=PCI_ROM_RESOURCE; i++)
- if (dev->resource[i].flags & IORESOURCE_BUSY)
- return &pci_compat_driver;
- }
- return NULL;
- }
- /*
- * This interrupt-safe spinlock protects all accesses to PCI
- * configuration space.
- */
- static spinlock_t pci_lock = SPIN_LOCK_UNLOCKED;
- /*
- * Wrappers for all PCI configuration access functions. They just check
- * alignment, do locking and call the low-level functions pointed to
- * by pci_dev->ops.
- */
- #define PCI_byte_BAD 0
- #define PCI_word_BAD (pos & 1)
- #define PCI_dword_BAD (pos & 3)
- #define PCI_OP(rw,size,type)
- int pci_##rw##_config_##size (struct pci_dev *dev, int pos, type value)
- {
- int res;
- unsigned long flags;
- if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER;
- spin_lock_irqsave(&pci_lock, flags);
- res = dev->bus->ops->rw##_##size(dev, pos, value);
- spin_unlock_irqrestore(&pci_lock, flags);
- return res;
- }
- PCI_OP(read, byte, u8 *)
- PCI_OP(read, word, u16 *)
- PCI_OP(read, dword, u32 *)
- PCI_OP(write, byte, u8)
- PCI_OP(write, word, u16)
- PCI_OP(write, dword, u32)
- /**
- * 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)
- {
- u16 cmd;
- pci_read_config_word(dev, PCI_COMMAND, &cmd);
- if (! (cmd & PCI_COMMAND_MASTER)) {
- DBG("PCI: Enabling bus mastering for device %sn", dev->slot_name);
- cmd |= PCI_COMMAND_MASTER;
- pci_write_config_word(dev, PCI_COMMAND, cmd);
- }
- pcibios_set_master(dev);
- }
- /**
- * pdev_set_mwi - arch helper function for pcibios_set_mwi
- * @dev: the PCI device for which MWI is enabled
- *
- * Helper function for implementation the arch-specific pcibios_set_mwi
- * function. Originally copied from drivers/net/acenic.c.
- * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
- *
- * RETURNS: An appriopriate -ERRNO error value on eror, or zero for success.
- */
- int
- pdev_set_mwi(struct pci_dev *dev)
- {
- int rc = 0;
- u8 cache_size;
- /*
- * Looks like this is necessary to deal with on all architectures,
- * even this %$#%$# N440BX Intel based thing doesn't get it right.
- * Ie. having two NICs in the machine, one will have the cache
- * line set at boot time, the other will not.
- */
- pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cache_size);
- cache_size <<= 2;
- if (cache_size != SMP_CACHE_BYTES) {
- printk(KERN_WARNING "PCI: %s PCI cache line size set incorrectly "
- "(%i bytes) by BIOS/FW, ",
- dev->slot_name, cache_size);
- if (cache_size > SMP_CACHE_BYTES) {
- printk("expecting %in", SMP_CACHE_BYTES);
- rc = -EINVAL;
- } else {
- printk("correcting to %in", SMP_CACHE_BYTES);
- pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
- SMP_CACHE_BYTES >> 2);
- }
- }
- return rc;
- }
- /**
- * 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,
- * and then calls @pcibios_set_mwi to do the needed arch specific
- * operations or a generic mwi-prep function.
- *
- * RETURNS: An appriopriate -ERRNO error value on eror, or zero for success.
- */
- int
- pci_set_mwi(struct pci_dev *dev)
- {
- int rc;
- u16 cmd;
- #ifdef HAVE_ARCH_PCI_MWI
- rc = pcibios_set_mwi(dev);
- #else
- rc = pdev_set_mwi(dev);
- #endif
- if (rc)
- return rc;
- pci_read_config_word(dev, PCI_COMMAND, &cmd);
- if (! (cmd & PCI_COMMAND_INVALIDATE)) {
- DBG("PCI: Enabling Mem-Wr-Inval for device %sn", dev->slot_name);
- cmd |= PCI_COMMAND_INVALIDATE;
- pci_write_config_word(dev, PCI_COMMAND, cmd);
- }
-
- return 0;
- }
- /**
- * 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);
- }
- }
- 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_dac_set_dma_mask(struct pci_dev *dev, u64 mask)
- {
- if (!pci_dac_dma_supported(dev, mask))
- return -EIO;
- dev->dma_mask = mask;
- return 0;
- }
-
- /*
- * Translate the low bits of the PCI base
- * to the resource type
- */
- static inline unsigned int pci_calc_resource_flags(unsigned int flags)
- {
- if (flags & PCI_BASE_ADDRESS_SPACE_IO)
- return IORESOURCE_IO;
- if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
- return IORESOURCE_MEM | IORESOURCE_PREFETCH;
- return IORESOURCE_MEM;
- }
- /*
- * Find the extent of a PCI decode..
- */
- static u32 pci_size(u32 base, unsigned long mask)
- {
- u32 size = mask & base; /* Find the significant bits */
- size = size & ~(size-1); /* Get the lowest of them to find the decode size */
- return size-1; /* extent = size - 1 */
- }
- static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
- {
- unsigned int pos, reg, next;
- u32 l, sz;
- struct resource *res;
- for(pos=0; pos<howmany; pos = next) {
- next = pos+1;
- res = &dev->resource[pos];
- res->name = dev->name;
- reg = PCI_BASE_ADDRESS_0 + (pos << 2);
- pci_read_config_dword(dev, reg, &l);
- pci_write_config_dword(dev, reg, ~0);
- pci_read_config_dword(dev, reg, &sz);
- pci_write_config_dword(dev, reg, l);
- if (!sz || sz == 0xffffffff)
- continue;
- if (l == 0xffffffff)
- l = 0;
- if ((l & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_MEMORY) {
- res->start = l & PCI_BASE_ADDRESS_MEM_MASK;
- res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK;
- sz = pci_size(sz, PCI_BASE_ADDRESS_MEM_MASK);
- } else {
- res->start = l & PCI_BASE_ADDRESS_IO_MASK;
- res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK;
- sz = pci_size(sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff);
- }
- res->end = res->start + (unsigned long) sz;
- res->flags |= pci_calc_resource_flags(l);
- if ((l & (PCI_BASE_ADDRESS_SPACE | PCI_BASE_ADDRESS_MEM_TYPE_MASK))
- == (PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64)) {
- pci_read_config_dword(dev, reg+4, &l);
- next++;
- #if BITS_PER_LONG == 64
- res->start |= ((unsigned long) l) << 32;
- res->end = res->start + sz;
- pci_write_config_dword(dev, reg+4, ~0);
- pci_read_config_dword(dev, reg+4, &sz);
- pci_write_config_dword(dev, reg+4, l);
- if (~sz)
- res->end = res->start + 0xffffffff +
- (((unsigned long) ~sz) << 32);
- #else
- if (l) {
- printk(KERN_ERR "PCI: Unable to handle 64-bit address for device %sn", dev->slot_name);
- res->start = 0;
- res->flags = 0;
- continue;
- }
- #endif
- }
- }
- if (rom) {
- dev->rom_base_reg = rom;
- res = &dev->resource[PCI_ROM_RESOURCE];
- pci_read_config_dword(dev, rom, &l);
- pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE);
- pci_read_config_dword(dev, rom, &sz);
- pci_write_config_dword(dev, rom, l);
- if (l == 0xffffffff)
- l = 0;
- if (sz && sz != 0xffffffff) {
- res->flags = (l & PCI_ROM_ADDRESS_ENABLE) |
- IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
- res->start = l & PCI_ROM_ADDRESS_MASK;
- sz = pci_size(sz, PCI_ROM_ADDRESS_MASK);
- res->end = res->start + (unsigned long) sz;
- }
- res->name = dev->name;
- }
- }
- void __devinit pci_read_bridge_bases(struct pci_bus *child)
- {
- struct pci_dev *dev = child->self;
- u8 io_base_lo, io_limit_lo;
- u16 mem_base_lo, mem_limit_lo;
- unsigned long base, limit;
- struct resource *res;
- int i;
- if (!dev) /* It's a host bus, nothing to read */
- return;
- if (dev->transparent) {
- printk("Transparent bridge - %sn", dev->name);
- for(i = 0; i < 4; i++)
- child->resource[i] = child->parent->resource[i];
- return;
- }
- for(i=0; i<3; i++)
- child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
- res = child->resource[0];
- pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
- pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
- base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
- limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
- if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
- u16 io_base_hi, io_limit_hi;
- pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
- pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
- base |= (io_base_hi << 16);
- limit |= (io_limit_hi << 16);
- }
- if (base && base <= limit) {
- res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
- res->start = base;
- res->end = limit + 0xfff;
- }
- res = child->resource[1];
- pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
- pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
- base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
- limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
- if (base && base <= limit) {
- res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
- res->start = base;
- res->end = limit + 0xfffff;
- }
- res = child->resource[2];
- pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
- pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
- base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
- limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
- if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
- u32 mem_base_hi, mem_limit_hi;
- pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
- pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
- #if BITS_PER_LONG == 64
- base |= ((long) mem_base_hi) << 32;
- limit |= ((long) mem_limit_hi) << 32;
- #else
- if (mem_base_hi || mem_limit_hi) {
- printk(KERN_ERR "PCI: Unable to handle 64-bit address space for %sn", child->name);
- return;
- }
- #endif
- }
- if (base && base <= limit) {
- res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
- res->start = base;
- res->end = limit + 0xfffff;
- }
- }
- static struct pci_bus * __devinit pci_alloc_bus(void)
- {
- struct pci_bus *b;
- b = kmalloc(sizeof(*b), GFP_KERNEL);
- if (b) {
- memset(b, 0, sizeof(*b));
- INIT_LIST_HEAD(&b->children);
- INIT_LIST_HEAD(&b->devices);
- }
- return b;
- }
- struct pci_bus * __devinit pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
- {
- struct pci_bus *child;
- int i;
- /*
- * Allocate a new bus, and inherit stuff from the parent..
- */
- child = pci_alloc_bus();
- list_add_tail(&child->node, &parent->children);
- child->self = dev;
- dev->subordinate = child;
- child->parent = parent;
- child->ops = parent->ops;
- child->sysdata = parent->sysdata;
- /*
- * Set up the primary, secondary and subordinate
- * bus numbers.
- */
- child->number = child->secondary = busnr;
- child->primary = parent->secondary;
- child->subordinate = 0xff;
- /* Set up default resource pointers and names.. */
- for (i = 0; i < 4; i++) {
- child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
- child->resource[i]->name = child->name;
- }
- return child;
- }
- unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus);
- /*
- * If it's a bridge, configure it and scan the bus behind it.
- * For CardBus bridges, we don't scan behind as the devices will
- * be handled by the bridge driver itself.
- *
- * We need to process bridges in two passes -- first we scan those
- * already configured by the BIOS and after we are done with all of
- * them, we proceed to assigning numbers to the remaining buses in
- * order to avoid overlaps between old and new bus numbers.
- */
- static int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass)
- {
- unsigned int buses;
- unsigned short cr;
- struct pci_bus *child;
- int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
- pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
- DBG("Scanning behind PCI bridge %s, config %06x, pass %dn", dev->slot_name, buses & 0xffffff, pass);
- if ((buses & 0xffff00) && !pcibios_assign_all_busses()) {
- /*
- * Bus already configured by firmware, process it in the first
- * pass and just note the configuration.
- */
- if (pass)
- return max;
- child = pci_add_new_bus(bus, dev, 0);
- child->primary = buses & 0xFF;
- child->secondary = (buses >> 8) & 0xFF;
- child->subordinate = (buses >> 16) & 0xFF;
- child->number = child->secondary;
- if (!is_cardbus) {
- unsigned int cmax = pci_do_scan_bus(child);
- if (cmax > max) max = cmax;
- } else {
- unsigned int cmax = child->subordinate;
- if (cmax > max) max = cmax;
- }
- } else {
- /*
- * We need to assign a number to this bus which we always
- * do in the second pass. We also keep all address decoders
- * on the bridge disabled during scanning. FIXME: Why?
- */
- if (!pass)
- return max;
- pci_read_config_word(dev, PCI_COMMAND, &cr);
- pci_write_config_word(dev, PCI_COMMAND, 0x0000);
- pci_write_config_word(dev, PCI_STATUS, 0xffff);
- child = pci_add_new_bus(bus, dev, ++max);
- buses = (buses & 0xff000000)
- | ((unsigned int)(child->primary) << 0)
- | ((unsigned int)(child->secondary) << 8)
- | ((unsigned int)(child->subordinate) << 16);
- /*
- * We need to blast all three values with a single write.
- */
- pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
- if (!is_cardbus) {
- /* Now we can scan all subordinate buses... */
- max = pci_do_scan_bus(child);
- } else {
- /*
- * For CardBus bridges, we leave 4 bus numbers
- * as cards with a PCI-to-PCI bridge can be
- * inserted later.
- */
- max += 3;
- }
- /*
- * Set the subordinate bus number to its real value.
- */
- child->subordinate = max;
- pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
- pci_write_config_word(dev, PCI_COMMAND, cr);
- }
- sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number);
- return max;
- }
- /*
- * Read interrupt line and base address registers.
- * The architecture-dependent code can tweak these, of course.
- */
- static void pci_read_irq(struct pci_dev *dev)
- {
- unsigned char irq;
- pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
- if (irq)
- pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
- dev->irq = irq;
- }
- /**
- * pci_setup_device - fill in class and map information of a device
- * @dev: the device structure to fill
- *
- * Initialize the device structure with information about the device's
- * vendor,class,memory and IO-space addresses,IRQ lines etc.
- * Called at initialisation of the PCI subsystem and by CardBus services.
- * Returns 0 on success and -1 if unknown type of device (not normal, bridge
- * or CardBus).
- */
- int pci_setup_device(struct pci_dev * dev)
- {
- u32 class;
- sprintf(dev->slot_name, "%02x:%02x.%d", dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
- sprintf(dev->name, "PCI device %04x:%04x", dev->vendor, dev->device);
-
- pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
- class >>= 8; /* upper 3 bytes */
- dev->class = class;
- class >>= 8;
- DBG("Found %02x:%02x [%04x/%04x] %06x %02xn", dev->bus->number, dev->devfn, dev->vendor, dev->device, class, dev->hdr_type);
- /* "Unknown power state" */
- dev->current_state = 4;
- switch (dev->hdr_type) { /* header type */
- case PCI_HEADER_TYPE_NORMAL: /* standard header */
- if (class == PCI_CLASS_BRIDGE_PCI)
- goto bad;
- pci_read_irq(dev);
- pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
- pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
- pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
- break;
- case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
- if (class != PCI_CLASS_BRIDGE_PCI)
- goto bad;
- /* The PCI-to-PCI bridge spec requires that subtractive
- decoding (i.e. transparent) bridge must have programming
- interface code of 0x01. */
- dev->transparent = ((dev->class & 0xff) == 1);
- pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
- break;
- case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
- if (class != PCI_CLASS_BRIDGE_CARDBUS)
- goto bad;
- pci_read_irq(dev);
- pci_read_bases(dev, 1, 0);
- pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
- pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
- break;
- default: /* unknown header */
- printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.n",
- dev->slot_name, dev->hdr_type);
- return -1;
- bad:
- printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.n",
- dev->slot_name, class, dev->hdr_type);
- dev->class = PCI_CLASS_NOT_DEFINED;
- }
- /* We found a fine healthy device, go go go... */
- return 0;
- }
- /*
- * Read the config data for a PCI device, sanity-check it
- * and fill in the dev structure...
- */
- struct pci_dev * __devinit pci_scan_device(struct pci_dev *temp)
- {
- struct pci_dev *dev;
- u32 l;
- if (pci_read_config_dword(temp, PCI_VENDOR_ID, &l))
- return NULL;
- /* some broken boards return 0 or ~0 if a slot is empty: */
- if (l == 0xffffffff || l == 0x00000000 || l == 0x0000ffff || l == 0xffff0000)
- return NULL;
- dev = kmalloc(sizeof(*dev), GFP_KERNEL);
- if (!dev)
- return NULL;
- memcpy(dev, temp, sizeof(*dev));
- dev->vendor = l & 0xffff;
- dev->device = (l >> 16) & 0xffff;
- /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
- set this higher, assuming the system even supports it. */
- dev->dma_mask = 0xffffffff;
- if (pci_setup_device(dev) < 0) {
- kfree(dev);
- dev = NULL;
- }
- return dev;
- }
- struct pci_dev * __devinit pci_scan_slot(struct pci_dev *temp)
- {
- struct pci_bus *bus = temp->bus;
- struct pci_dev *dev;
- struct pci_dev *first_dev = NULL;
- int func = 0;
- int is_multi = 0;
- u8 hdr_type;
- for (func = 0; func < 8; func++, temp->devfn++) {
- if (func && !is_multi) /* not a multi-function device */
- continue;
- if (pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type))
- continue;
- temp->hdr_type = hdr_type & 0x7f;
- dev = pci_scan_device(temp);
- if (!dev)
- continue;
- pci_name_device(dev);
- if (!func) {
- is_multi = hdr_type & 0x80;
- first_dev = dev;
- }
- /*
- * Link the device to both the global PCI device chain and
- * the per-bus list of devices.
- */
- list_add_tail(&dev->global_list, &pci_devices);
- list_add_tail(&dev->bus_list, &bus->devices);
- /* Fix up broken headers */
- pci_fixup_device(PCI_FIXUP_HEADER, dev);
- }
- return first_dev;
- }
- unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
- {
- unsigned int devfn, max, pass;
- struct list_head *ln;
- struct pci_dev *dev, dev0;
- DBG("Scanning bus %02xn", bus->number);
- max = bus->secondary;
- /* Create a device template */
- memset(&dev0, 0, sizeof(dev0));
- dev0.bus = bus;
- dev0.sysdata = bus->sysdata;
- /* Go find them, Rover! */
- for (devfn = 0; devfn < 0x100; devfn += 8) {
- dev0.devfn = devfn;
- pci_scan_slot(&dev0);
- }
- /*
- * After performing arch-dependent fixup of the bus, look behind
- * all PCI-to-PCI bridges on this bus.
- */
- DBG("Fixups for bus %02xn", bus->number);
- pcibios_fixup_bus(bus);
- for (pass=0; pass < 2; pass++)
- for (ln=bus->devices.next; ln != &bus->devices; ln=ln->next) {
- dev = pci_dev_b(ln);
- if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
- max = pci_scan_bridge(bus, dev, max, pass);
- }
- /*
- * We've scanned the bus and so we know all about what's on
- * the other side of any bridges that may be on this bus plus
- * any devices.
- *
- * Return how far we've got finding sub-buses.
- */
- DBG("Bus scan for %02x returning with max=%02xn", bus->number, max);
- return max;
- }
- int __devinit pci_bus_exists(const struct list_head *list, int nr)
- {
- const struct list_head *l;
- for(l=list->next; l != list; l = l->next) {
- const struct pci_bus *b = pci_bus_b(l);
- if (b->number == nr || pci_bus_exists(&b->children, nr))
- return 1;
- }
- return 0;
- }
- struct pci_bus * __devinit pci_alloc_primary_bus(int bus)
- {
- struct pci_bus *b;
- if (pci_bus_exists(&pci_root_buses, bus)) {
- /* If we already got to this bus through a different bridge, ignore it */
- DBG("PCI: Bus %02x already knownn", bus);
- return NULL;
- }
- b = pci_alloc_bus();
- list_add_tail(&b->node, &pci_root_buses);
- b->number = b->secondary = bus;
- b->resource[0] = &ioport_resource;
- b->resource[1] = &iomem_resource;
- return b;
- }
- struct pci_bus * __devinit pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata)
- {
- struct pci_bus *b = pci_alloc_primary_bus(bus);
- if (b) {
- b->sysdata = sysdata;
- b->ops = ops;
- b->subordinate = pci_do_scan_bus(b);
- }
- return b;
- }
- #ifdef CONFIG_PM
- /*
- * PCI Power management..
- *
- * This needs to be done centralized, so that we power manage PCI
- * devices in the right order: we should not shut down PCI bridges
- * before we've shut down the devices behind them, and we should
- * not wake up devices before we've woken up the bridge to the
- * device.. Eh?
- *
- * We do not touch devices that don't have a driver that exports
- * a suspend/resume function. That is just too dangerous. If the default
- * PCI suspend/resume functions work for a device, the driver can
- * easily implement them (ie just have a suspend function that calls
- * the pci_set_power_state() function).
- */
- static int pci_pm_save_state_device(struct pci_dev *dev, u32 state)
- {
- int error = 0;
- if (dev) {
- struct pci_driver *driver = dev->driver;
- if (driver && driver->save_state)
- error = driver->save_state(dev,state);
- }
- return error;
- }
- static int pci_pm_suspend_device(struct pci_dev *dev, u32 state)
- {
- int error = 0;
- if (dev) {
- struct pci_driver *driver = dev->driver;
- if (driver && driver->suspend)
- error = driver->suspend(dev,state);
- }
- return error;
- }
- static int pci_pm_resume_device(struct pci_dev *dev)
- {
- int error = 0;
- if (dev) {
- struct pci_driver *driver = dev->driver;
- if (driver && driver->resume)
- error = driver->resume(dev);
- }
- return error;
- }
- static int pci_pm_save_state_bus(struct pci_bus *bus, u32 state)
- {
- struct list_head *list;
- int error = 0;
- list_for_each(list, &bus->children) {
- error = pci_pm_save_state_bus(pci_bus_b(list),state);
- if (error) return error;
- }
- list_for_each(list, &bus->devices) {
- error = pci_pm_save_state_device(pci_dev_b(list),state);
- if (error) return error;
- }
- return 0;
- }
- static int pci_pm_suspend_bus(struct pci_bus *bus, u32 state)
- {
- struct list_head *list;
- /* Walk the bus children list */
- list_for_each(list, &bus->children)
- pci_pm_suspend_bus(pci_bus_b(list),state);
- /* Walk the device children list */
- list_for_each(list, &bus->devices)
- pci_pm_suspend_device(pci_dev_b(list),state);
- return 0;
- }
- static int pci_pm_resume_bus(struct pci_bus *bus)
- {
- struct list_head *list;
- /* Walk the device children list */
- list_for_each(list, &bus->devices)
- pci_pm_resume_device(pci_dev_b(list));
- /* And then walk the bus children */
- list_for_each(list, &bus->children)
- pci_pm_resume_bus(pci_bus_b(list));
- return 0;
- }
- static int pci_pm_save_state(u32 state)
- {
- struct list_head *list;
- struct pci_bus *bus;
- int error = 0;
- list_for_each(list, &pci_root_buses) {
- bus = pci_bus_b(list);
- error = pci_pm_save_state_bus(bus,state);
- if (!error)
- error = pci_pm_save_state_device(bus->self,state);
- }
- return error;
- }
- static int pci_pm_suspend(u32 state)
- {
- struct list_head *list;
- struct pci_bus *bus;
- list_for_each(list, &pci_root_buses) {
- bus = pci_bus_b(list);
- pci_pm_suspend_bus(bus,state);
- pci_pm_suspend_device(bus->self,state);
- }
- return 0;
- }
- int pci_pm_resume(void)
- {
- struct list_head *list;
- struct pci_bus *bus;
- list_for_each(list, &pci_root_buses) {
- bus = pci_bus_b(list);
- pci_pm_resume_device(bus->self);
- pci_pm_resume_bus(bus);
- }
- return 0;
- }
- static int
- pci_pm_callback(struct pm_dev *pm_device, pm_request_t rqst, void *data)
- {
- int error = 0;
- switch (rqst) {
- case PM_SAVE_STATE:
- error = pci_pm_save_state((unsigned long)data);
- break;
- case PM_SUSPEND:
- error = pci_pm_suspend((unsigned long)data);
- break;
- case PM_RESUME:
- error = pci_pm_resume();
- break;
- default: break;
- }
- return error;
- }
- #endif
- /*
- * Pool allocator ... wraps the pci_alloc_consistent page allocator, so
- * small blocks are easily used by drivers for bus mastering controllers.
- * This should probably be sharing the guts of the slab allocator.
- */
- struct pci_pool { /* the pool */
- struct list_head page_list;
- spinlock_t lock;
- size_t blocks_per_page;
- size_t size;
- int flags;
- struct pci_dev *dev;
- size_t allocation;
- char name [32];
- wait_queue_head_t waitq;
- };
- struct pci_page { /* cacheable header for 'allocation' bytes */
- struct list_head page_list;
- void *vaddr;
- dma_addr_t dma;
- unsigned long bitmap [0];
- };
- #define POOL_TIMEOUT_JIFFIES ((100 /* msec */ * HZ) / 1000)
- #define POOL_POISON_BYTE 0xa7
- // #define CONFIG_PCIPOOL_DEBUG
- /**
- * pci_pool_create - Creates a pool of pci consistent memory blocks, for dma.
- * @name: name of pool, for diagnostics
- * @pdev: pci device that will be doing the DMA
- * @size: size of the blocks in this pool.
- * @align: alignment requirement for blocks; must be a power of two
- * @allocation: returned blocks won't cross this boundary (or zero)
- * @flags: SLAB_* flags (not all are supported).
- *
- * Returns a pci allocation pool with the requested characteristics, or
- * null if one can't be created. Given one of these pools, pci_pool_alloc()
- * may be used to allocate memory. Such memory will all have "consistent"
- * DMA mappings, accessible by the device and its driver without using
- * cache flushing primitives. The actual size of blocks allocated may be
- * larger than requested because of alignment.
- *
- * If allocation is nonzero, objects returned from pci_pool_alloc() won't
- * cross that size boundary. This is useful for devices which have
- * addressing restrictions on individual DMA transfers, such as not crossing
- * boundaries of 4KBytes.
- */
- struct pci_pool *
- pci_pool_create (const char *name, struct pci_dev *pdev,
- size_t size, size_t align, size_t allocation, int flags)
- {
- struct pci_pool *retval;
- if (align == 0)
- align = 1;
- if (size == 0)
- return 0;
- else if (size < align)
- size = align;
- else if ((size % align) != 0) {
- size += align + 1;
- size &= ~(align - 1);
- }
- if (allocation == 0) {
- if (PAGE_SIZE < size)
- allocation = size;
- else
- allocation = PAGE_SIZE;
- // FIXME: round up for less fragmentation
- } else if (allocation < size)
- return 0;
- if (!(retval = kmalloc (sizeof *retval, flags)))
- return retval;
- #ifdef CONFIG_PCIPOOL_DEBUG
- flags |= SLAB_POISON;
- #endif
- strncpy (retval->name, name, sizeof retval->name);
- retval->name [sizeof retval->name - 1] = 0;
- retval->dev = pdev;
- INIT_LIST_HEAD (&retval->page_list);
- spin_lock_init (&retval->lock);
- retval->size = size;
- retval->flags = flags;
- retval->allocation = allocation;
- retval->blocks_per_page = allocation / size;
- init_waitqueue_head (&retval->waitq);
- #ifdef CONFIG_PCIPOOL_DEBUG
- printk (KERN_DEBUG "pcipool create %s/%s size %d, %d/page (%d alloc)n",
- pdev ? pdev->slot_name : NULL, retval->name, size,
- retval->blocks_per_page, allocation);
- #endif
- return retval;
- }
- static struct pci_page *
- pool_alloc_page (struct pci_pool *pool, int mem_flags)
- {
- struct pci_page *page;
- int mapsize;
- mapsize = pool->blocks_per_page;
- mapsize = (mapsize + BITS_PER_LONG - 1) / BITS_PER_LONG;
- mapsize *= sizeof (long);
- page = (struct pci_page *) kmalloc (mapsize + sizeof *page, mem_flags);
- if (!page)
- return 0;
- page->vaddr = pci_alloc_consistent (pool->dev,
- pool->allocation,
- &page->dma);
- if (page->vaddr) {
- memset (page->bitmap, 0xff, mapsize); // bit set == free
- if (pool->flags & SLAB_POISON)
- memset (page->vaddr, POOL_POISON_BYTE, pool->allocation);
- list_add (&page->page_list, &pool->page_list);
- } else {
- kfree (page);
- page = 0;
- }
- return page;
- }
- static inline int
- is_page_busy (int blocks, unsigned long *bitmap)
- {
- while (blocks > 0) {
- if (*bitmap++ != ~0UL)
- return 1;
- blocks -= BITS_PER_LONG;
- }
- return 0;
- }
- static void
- pool_free_page (struct pci_pool *pool, struct pci_page *page)
- {
- dma_addr_t dma = page->dma;
- if (pool->flags & SLAB_POISON)
- memset (page->vaddr, POOL_POISON_BYTE, pool->allocation);
- pci_free_consistent (pool->dev, pool->allocation, page->vaddr, dma);
- list_del (&page->page_list);
- kfree (page);
- }
- /**
- * pci_pool_destroy - destroys a pool of pci memory blocks.
- * @pool: pci pool that will be destroyed
- *
- * Caller guarantees that no more memory from the pool is in use,
- * and that nothing will try to use the pool after this call.
- */
- void
- pci_pool_destroy (struct pci_pool *pool)
- {
- unsigned long flags;
- #ifdef CONFIG_PCIPOOL_DEBUG
- printk (KERN_DEBUG "pcipool destroy %s/%sn",
- pool->dev ? pool->dev->slot_name : NULL,
- pool->name);
- #endif
- spin_lock_irqsave (&pool->lock, flags);
- while (!list_empty (&pool->page_list)) {
- struct pci_page *page;
- page = list_entry (pool->page_list.next,
- struct pci_page, page_list);
- if (is_page_busy (pool->blocks_per_page, page->bitmap)) {
- printk (KERN_ERR "pci_pool_destroy %s/%s, %p busyn",
- pool->dev ? pool->dev->slot_name : NULL,
- pool->name, page->vaddr);
- /* leak the still-in-use consistent memory */
- list_del (&page->page_list);
- kfree (page);
- } else
- pool_free_page (pool, page);
- }
- spin_unlock_irqrestore (&pool->lock, flags);
- kfree (pool);
- }
- /**
- * pci_pool_alloc - get a block of consistent memory
- * @pool: pci pool that will produce the block
- * @mem_flags: SLAB_KERNEL or SLAB_ATOMIC
- * @handle: pointer to dma address of block
- *
- * This returns the kernel virtual address of a currently unused block,
- * and reports its dma address through the handle.
- * If such a memory block can't be allocated, null is returned.
- */
- void *
- pci_pool_alloc (struct pci_pool *pool, int mem_flags, dma_addr_t *handle)
- {
- unsigned long flags;
- struct list_head *entry;
- struct pci_page *page;
- int map, block;
- size_t offset;
- void *retval;
- restart:
- spin_lock_irqsave (&pool->lock, flags);
- list_for_each (entry, &pool->page_list) {
- int i;
- page = list_entry (entry, struct pci_page, page_list);
- /* only cachable accesses here ... */
- for (map = 0, i = 0;
- i < pool->blocks_per_page;
- i += BITS_PER_LONG, map++) {
- if (page->bitmap [map] == 0)
- continue;
- block = ffz (~ page->bitmap [map]);
- if ((i + block) < pool->blocks_per_page) {
- clear_bit (block, &page->bitmap [map]);
- offset = (BITS_PER_LONG * map) + block;
- offset *= pool->size;
- goto ready;
- }
- }
- }
- if (!(page = pool_alloc_page (pool, mem_flags))) {
- if (mem_flags == SLAB_KERNEL) {
- DECLARE_WAITQUEUE (wait, current);
- current->state = TASK_INTERRUPTIBLE;
- add_wait_queue (&pool->waitq, &wait);
- spin_unlock_irqrestore (&pool->lock, flags);
- schedule_timeout (POOL_TIMEOUT_JIFFIES);
- current->state = TASK_RUNNING;
- remove_wait_queue (&pool->waitq, &wait);
- goto restart;
- }
- retval = 0;
- goto done;
- }
- clear_bit (0, &page->bitmap [0]);
- offset = 0;
- ready:
- retval = offset + page->vaddr;
- *handle = offset + page->dma;
- done:
- spin_unlock_irqrestore (&pool->lock, flags);
- return retval;
- }
- static struct pci_page *
- pool_find_page (struct pci_pool *pool, dma_addr_t dma)
- {
- unsigned long flags;
- struct list_head *entry;
- struct pci_page *page;
- spin_lock_irqsave (&pool->lock, flags);
- list_for_each (entry, &pool->page_list) {
- page = list_entry (entry, struct pci_page, page_list);
- if (dma < page->dma)
- continue;
- if (dma < (page->dma + pool->allocation))
- goto done;
- }
- page = 0;
- done:
- spin_unlock_irqrestore (&pool->lock, flags);
- return page;
- }
- /**
- * pci_pool_free - put block back into pci pool
- * @pool: the pci pool holding the block
- * @vaddr: virtual address of block
- * @dma: dma address of block
- *
- * Caller promises neither device nor driver will again touch this block
- * unless it is first re-allocated.
- */
- void
- pci_pool_free (struct pci_pool *pool, void *vaddr, dma_addr_t dma)
- {
- struct pci_page *page;
- unsigned long flags;
- int map, block;
- if ((page = pool_find_page (pool, dma)) == 0) {
- printk (KERN_ERR "pci_pool_free %s/%s, %p/%x (bad dma)n",
- pool->dev ? pool->dev->slot_name : NULL,
- pool->name, vaddr, (int) (dma & 0xffffffff));
- return;
- }
- #ifdef CONFIG_PCIPOOL_DEBUG
- if (((dma - page->dma) + (void *)page->vaddr) != vaddr) {
- printk (KERN_ERR "pci_pool_free %s/%s, %p (bad vaddr)/%xn",
- pool->dev ? pool->dev->slot_name : NULL,
- pool->name, vaddr, (int) (dma & 0xffffffff));
- return;
- }
- #endif
- block = dma - page->dma;
- block /= pool->size;
- map = block / BITS_PER_LONG;
- block %= BITS_PER_LONG;
- #ifdef CONFIG_PCIPOOL_DEBUG
- if (page->bitmap [map] & (1UL << block)) {
- printk (KERN_ERR "pci_pool_free %s/%s, dma %x already freen",
- pool->dev ? pool->dev->slot_name : NULL,
- pool->name, dma);
- return;
- }
- #endif
- if (pool->flags & SLAB_POISON)
- memset (vaddr, POOL_POISON_BYTE, pool->size);
- spin_lock_irqsave (&pool->lock, flags);
- set_bit (block, &page->bitmap [map]);
- if (waitqueue_active (&pool->waitq))
- wake_up (&pool->waitq);
- /*
- * Resist a temptation to do
- * if (!is_page_busy(bpp, page->bitmap)) pool_free_page(pool, page);
- * it is not interrupt safe. Better have empty pages hang around.
- */
- spin_unlock_irqrestore (&pool->lock, flags);
- }
- void __devinit pci_init(void)
- {
- struct pci_dev *dev;
- pcibios_init();
- pci_for_each_dev(dev) {
- pci_fixup_device(PCI_FIXUP_FINAL, dev);
- }
- #ifdef CONFIG_PM
- pm_register(PM_PCI_DEV, 0, pci_pm_callback);
- #endif
- }
- static int __devinit pci_setup(char *str)
- {
- while (str) {
- char *k = strchr(str, ',');
- if (k)
- *k++ = 0;
- if (*str && (str = pcibios_setup(str)) && *str) {
- /* PCI layer options should be handled here */
- printk(KERN_ERR "PCI: Unknown option `%s'n", str);
- }
- str = k;
- }
- return 1;
- }
- __setup("pci=", pci_setup);
- EXPORT_SYMBOL(pci_read_config_byte);
- EXPORT_SYMBOL(pci_read_config_word);
- EXPORT_SYMBOL(pci_read_config_dword);
- EXPORT_SYMBOL(pci_write_config_byte);
- EXPORT_SYMBOL(pci_write_config_word);
- EXPORT_SYMBOL(pci_write_config_dword);
- EXPORT_SYMBOL(pci_devices);
- EXPORT_SYMBOL(pci_root_buses);
- EXPORT_SYMBOL(pci_enable_device_bars);
- EXPORT_SYMBOL(pci_enable_device);
- EXPORT_SYMBOL(pci_disable_device);
- EXPORT_SYMBOL(pci_find_capability);
- EXPORT_SYMBOL(pci_release_regions);
- EXPORT_SYMBOL(pci_request_regions);
- EXPORT_SYMBOL(pci_release_region);
- EXPORT_SYMBOL(pci_request_region);
- EXPORT_SYMBOL(pci_find_class);
- EXPORT_SYMBOL(pci_find_device);
- EXPORT_SYMBOL(pci_find_slot);
- EXPORT_SYMBOL(pci_find_subsys);
- EXPORT_SYMBOL(pci_set_master);
- EXPORT_SYMBOL(pci_set_mwi);
- EXPORT_SYMBOL(pci_clear_mwi);
- EXPORT_SYMBOL(pdev_set_mwi);
- EXPORT_SYMBOL(pci_set_dma_mask);
- EXPORT_SYMBOL(pci_dac_set_dma_mask);
- EXPORT_SYMBOL(pci_assign_resource);
- EXPORT_SYMBOL(pci_register_driver);
- EXPORT_SYMBOL(pci_unregister_driver);
- EXPORT_SYMBOL(pci_dev_driver);
- EXPORT_SYMBOL(pci_match_device);
- EXPORT_SYMBOL(pci_find_parent_resource);
- #ifdef CONFIG_HOTPLUG
- EXPORT_SYMBOL(pci_setup_device);
- EXPORT_SYMBOL(pci_insert_device);
- EXPORT_SYMBOL(pci_remove_device);
- EXPORT_SYMBOL(pci_announce_device_to_drivers);
- EXPORT_SYMBOL(pci_add_new_bus);
- EXPORT_SYMBOL(pci_do_scan_bus);
- EXPORT_SYMBOL(pci_scan_slot);
- EXPORT_SYMBOL(pci_scan_bus);
- #ifdef CONFIG_PROC_FS
- EXPORT_SYMBOL(pci_proc_attach_device);
- EXPORT_SYMBOL(pci_proc_detach_device);
- EXPORT_SYMBOL(pci_proc_attach_bus);
- EXPORT_SYMBOL(pci_proc_detach_bus);
- EXPORT_SYMBOL(proc_bus_pci_dir);
- #endif
- #endif
- EXPORT_SYMBOL(pci_set_power_state);
- EXPORT_SYMBOL(pci_save_state);
- EXPORT_SYMBOL(pci_restore_state);
- EXPORT_SYMBOL(pci_enable_wake);
- /* Obsolete functions */
- EXPORT_SYMBOL(pcibios_present);
- EXPORT_SYMBOL(pcibios_read_config_byte);
- EXPORT_SYMBOL(pcibios_read_config_word);
- EXPORT_SYMBOL(pcibios_read_config_dword);
- EXPORT_SYMBOL(pcibios_write_config_byte);
- EXPORT_SYMBOL(pcibios_write_config_word);
- EXPORT_SYMBOL(pcibios_write_config_dword);
- EXPORT_SYMBOL(pcibios_find_class);
- EXPORT_SYMBOL(pcibios_find_device);
- /* Quirk info */
- EXPORT_SYMBOL(isa_dma_bridge_buggy);
- EXPORT_SYMBOL(pci_pci_problems);
- /* Pool allocator */
- EXPORT_SYMBOL (pci_pool_create);
- EXPORT_SYMBOL (pci_pool_destroy);
- EXPORT_SYMBOL (pci_pool_alloc);
- EXPORT_SYMBOL (pci_pool_free);