acpiphp_glue.c

linux-2.6.15.6

	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
		pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
				bridge->hpp.latency_timer);
		pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
		if (bridge->hpp.enable_SERR)
			pci_bctl |= PCI_BRIDGE_CTL_SERR;
		else
			pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
		if (bridge->hpp.enable_PERR)
			pci_bctl |= PCI_BRIDGE_CTL_PARITY;
		else
			pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
		pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
		if (dev->subordinate) {
			list_for_each_entry(cdev, &dev->subordinate->devices,
					bus_list)
				program_hpp(cdev, bridge);
		}
	}
}

static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
{
	struct acpiphp_bridge bridge;
	struct pci_dev *dev;

	memset(&bridge, 0, sizeof(bridge));
	bridge.handle = handle;
	decode_hpp(&bridge);
	list_for_each_entry(dev, &bus->devices, bus_list)
		program_hpp(dev, &bridge);

}

/*
 * Remove devices for which we could not assign resources, call
 * arch specific code to fix-up the bus
 */
static void acpiphp_sanitize_bus(struct pci_bus *bus)
{
	struct pci_dev *dev;
	int i;
	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
			struct resource *res = &dev->resource[i];
			if ((res->flags & type_mask) && !res->start &&
					res->end) {
				/* Could not assign a required resources
				 * for this device, remove it */
				pci_remove_bus_device(dev);
				break;
			}
		}
	}
}

/* Program resources in newly inserted bridge */
static int acpiphp_configure_bridge (acpi_handle handle)
{
	struct acpi_pci_id pci_id;
	struct pci_bus *bus;

	if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
		err("cannot get PCI domain and bus number for bridge\n");
		return -EINVAL;
	}
	bus = pci_find_bus(pci_id.segment, pci_id.bus);
	if (!bus) {
		err("cannot find bus %d:%d\n",
				pci_id.segment, pci_id.bus);
		return -EINVAL;
	}

	pci_bus_size_bridges(bus);
	pci_bus_assign_resources(bus);
	acpiphp_sanitize_bus(bus);
	acpiphp_set_hpp_values(handle, bus);
	pci_enable_bridges(bus);
	acpiphp_configure_ioapics(handle);
	return 0;
}

static void handle_bridge_insertion(acpi_handle handle, u32 type)
{
	struct acpi_device *device, *pdevice;
	acpi_handle phandle;

	if ((type != ACPI_NOTIFY_BUS_CHECK) &&
			(type != ACPI_NOTIFY_DEVICE_CHECK)) {
		err("unexpected notification type %d\n", type);
		return;
	}

	acpi_get_parent(handle, &phandle);
	if (acpi_bus_get_device(phandle, &pdevice)) {
		dbg("no parent device, assuming NULL\n");
		pdevice = NULL;
	}
	if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
		err("cannot add bridge to acpi list\n");
		return;
	}
	if (!acpiphp_configure_bridge(handle) &&
		!acpi_bus_start(device))
		add_bridge(handle);
	else
		err("cannot configure and start bridge\n");

}

/*
 * ACPI event handlers
 */

/**
 * handle_hotplug_event_bridge - handle ACPI event on bridges
 *
 * @handle: Notify()'ed acpi_handle
 * @type: Notify code
 * @context: pointer to acpiphp_bridge structure
 *
 * handles ACPI event notification on {host,p2p} bridges
 *
 */
static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
{
	struct acpiphp_bridge *bridge;
	char objname[64];
	struct acpi_buffer buffer = { .length = sizeof(objname),
				      .pointer = objname };
	struct acpi_device *device;

	if (acpi_bus_get_device(handle, &device)) {
		/* This bridge must have just been physically inserted */
		handle_bridge_insertion(handle, type);
		return;
	}

	bridge = acpiphp_handle_to_bridge(handle);
	if (!bridge) {
		err("cannot get bridge info\n");
		return;
	}

	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);

	switch (type) {
	case ACPI_NOTIFY_BUS_CHECK:
		/* bus re-enumerate */
		dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
		acpiphp_check_bridge(bridge);
		break;

	case ACPI_NOTIFY_DEVICE_CHECK:
		/* device check */
		dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
		acpiphp_check_bridge(bridge);
		break;

	case ACPI_NOTIFY_DEVICE_WAKE:
		/* wake event */
		dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
		break;

	case ACPI_NOTIFY_EJECT_REQUEST:
		/* request device eject */
		dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
		break;

	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
		printk(KERN_ERR "Device %s cannot be configured due"
				" to a frequency mismatch\n", objname);
		break;

	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
		printk(KERN_ERR "Device %s cannot be configured due"
				" to a bus mode mismatch\n", objname);
		break;

	case ACPI_NOTIFY_POWER_FAULT:
		printk(KERN_ERR "Device %s has suffered a power fault\n",
				objname);
		break;

	default:
		warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
		break;
	}
}

/**
 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
 *
 * @handle: Notify()'ed acpi_handle
 * @type: Notify code
 * @context: pointer to acpiphp_func structure
 *
 * handles ACPI event notification on slots
 *
 */
static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
{
	struct acpiphp_func *func;
	char objname[64];
	struct acpi_buffer buffer = { .length = sizeof(objname),
				      .pointer = objname };

	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);

	func = (struct acpiphp_func *)context;

	switch (type) {
	case ACPI_NOTIFY_BUS_CHECK:
		/* bus re-enumerate */
		dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
		acpiphp_enable_slot(func->slot);
		break;

	case ACPI_NOTIFY_DEVICE_CHECK:
		/* device check : re-enumerate from parent bus */
		dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
		acpiphp_check_bridge(func->slot->bridge);
		break;

	case ACPI_NOTIFY_DEVICE_WAKE:
		/* wake event */
		dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
		break;

	case ACPI_NOTIFY_EJECT_REQUEST:
		/* request device eject */
		dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
		if (!(acpiphp_disable_slot(func->slot)))
			acpiphp_eject_slot(func->slot);
		break;

	default:
		warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
		break;
	}
}

static int is_root_bridge(acpi_handle handle)
{
	acpi_status status;
	struct acpi_device_info *info;
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	int i;

	status = acpi_get_object_info(handle, &buffer);
	if (ACPI_SUCCESS(status)) {
		info = buffer.pointer;
		if ((info->valid & ACPI_VALID_HID) &&
			!strcmp(PCI_ROOT_HID_STRING,
					info->hardware_id.value)) {
			acpi_os_free(buffer.pointer);
			return 1;
		}
		if (info->valid & ACPI_VALID_CID) {
			for (i=0; i < info->compatibility_id.count; i++) {
				if (!strcmp(PCI_ROOT_HID_STRING,
					info->compatibility_id.id[i].value)) {
					acpi_os_free(buffer.pointer);
					return 1;
				}
			}
		}
	}
	return 0;
}

static acpi_status
find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	int *count = (int *)context;

	if (is_root_bridge(handle)) {
		acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
				handle_hotplug_event_bridge, NULL);
			(*count)++;
	}
	return AE_OK ;
}

static struct acpi_pci_driver acpi_pci_hp_driver = {
	.add =		add_bridge,
	.remove =	remove_bridge,
};

/**
 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
 *
 */
int __init acpiphp_glue_init(void)
{
	int num = 0;

	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
			ACPI_UINT32_MAX, find_root_bridges, &num, NULL);

	if (num <= 0)
		return -1;
	else
		acpi_pci_register_driver(&acpi_pci_hp_driver);

	return 0;
}


/**
 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
 *
 * This function frees all data allocated in acpiphp_glue_init()
 */
void __exit acpiphp_glue_exit(void)
{
	acpi_pci_unregister_driver(&acpi_pci_hp_driver);
}


/**
 * acpiphp_get_num_slots - count number of slots in a system
 */
int __init acpiphp_get_num_slots(void)
{
	struct list_head *node;
	struct acpiphp_bridge *bridge;
	int num_slots;

	num_slots = 0;

	list_for_each (node, &bridge_list) {
		bridge = (struct acpiphp_bridge *)node;
		dbg("Bus %04x:%02x has %d slot%s\n",
				pci_domain_nr(bridge->pci_bus),
				bridge->pci_bus->number, bridge->nr_slots,
				bridge->nr_slots == 1 ? "" : "s");
		num_slots += bridge->nr_slots;
	}

	dbg("Total %d slots\n", num_slots);
	return num_slots;
}


#if 0
/**
 * acpiphp_for_each_slot - call function for each slot
 * @fn: callback function
 * @data: context to be passed to callback function
 *
 */
static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
{
	struct list_head *node;
	struct acpiphp_bridge *bridge;
	struct acpiphp_slot *slot;
	int retval = 0;

	list_for_each (node, &bridge_list) {
		bridge = (struct acpiphp_bridge *)node;
		for (slot = bridge->slots; slot; slot = slot->next) {
			retval = fn(slot, data);
			if (!retval)
				goto err_exit;
		}
	}

 err_exit:
	return retval;
}
#endif

/* search matching slot from id  */
struct acpiphp_slot *get_slot_from_id(int id)
{
	struct list_head *node;
	struct acpiphp_bridge *bridge;
	struct acpiphp_slot *slot;

	list_for_each (node, &bridge_list) {
		bridge = (struct acpiphp_bridge *)node;
		for (slot = bridge->slots; slot; slot = slot->next)
			if (slot->id == id)
				return slot;
	}

	/* should never happen! */
	err("%s: no object for id %d\n", __FUNCTION__, id);
	WARN_ON(1);
	return NULL;
}


/**
 * acpiphp_enable_slot - power on slot
 */
int acpiphp_enable_slot(struct acpiphp_slot *slot)
{
	int retval;

	down(&slot->crit_sect);

	/* wake up all functions */
	retval = power_on_slot(slot);
	if (retval)
		goto err_exit;

	if (get_slot_status(slot) == ACPI_STA_ALL)
		/* configure all functions */
		retval = enable_device(slot);

 err_exit:
	up(&slot->crit_sect);
	return retval;
}

/**
 * acpiphp_disable_slot - power off slot
 */
int acpiphp_disable_slot(struct acpiphp_slot *slot)
{
	int retval = 0;

	down(&slot->crit_sect);

	/* unconfigure all functions */
	retval = disable_device(slot);
	if (retval)
		goto err_exit;

	/* power off all functions */
	retval = power_off_slot(slot);
	if (retval)
		goto err_exit;

 err_exit:
	up(&slot->crit_sect);
	return retval;
}


/*
 * slot enabled:  1
 * slot disabled: 0
 */
u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
{
	return (slot->flags & SLOT_POWEREDON);
}


/*
 * latch closed:  1
 * latch   open:  0
 */
u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
{
	unsigned int sta;

	sta = get_slot_status(slot);

	return (sta & ACPI_STA_SHOW_IN_UI) ? 1 : 0;
}


/*
 * adapter presence : 1
 *          absence : 0
 */
u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
{
	unsigned int sta;

	sta = get_slot_status(slot);

	return (sta == 0) ? 0 : 1;
}


/*
 * pci address (seg/bus/dev)
 */
u32 acpiphp_get_address(struct acpiphp_slot *slot)
{
	u32 address;
	struct pci_bus *pci_bus = slot->bridge->pci_bus;

	address = (pci_domain_nr(pci_bus) << 16) |
		  (pci_bus->number << 8) |
		  slot->device;

	return address;
}