pciehp_ctrl.c

底层驱动开发

/* this is the main worker thread */
static int event_thread(void* data)
{
	struct controller *ctrl;
	lock_kernel();
	daemonize("pciehpd_event");

	unlock_kernel();

	while (1) {
		dbg("!!!!event_thread sleeping\n");
		down_interruptible (&event_semaphore);
		dbg("event_thread woken finished = %d\n", event_finished);
		if (event_finished || signal_pending(current))
			break;
		/* Do stuff here */
		if (pushbutton_pending)
			pciehp_pushbutton_thread(pushbutton_pending);
		else if (surprise_rm_pending)
			pciehp_surprise_rm_thread(surprise_rm_pending);
		else
			for (ctrl = pciehp_ctrl_list; ctrl; ctrl=ctrl->next)
				interrupt_event_handler(ctrl);
	}
	dbg("event_thread signals exit\n");
	up(&event_exit);
	return 0;
}

int pciehp_event_start_thread(void)
{
	int pid;

	/* initialize our semaphores */
	init_MUTEX_LOCKED(&event_exit);
	event_finished=0;

	init_MUTEX_LOCKED(&event_semaphore);
	pid = kernel_thread(event_thread, NULL, 0);

	if (pid < 0) {
		err ("Can't start up our event thread\n");
		return -1;
	}
	dbg("Our event thread pid = %d\n", pid);
	return 0;
}


void pciehp_event_stop_thread(void)
{
	event_finished = 1;
	dbg("event_thread finish command given\n");
	up(&event_semaphore);
	dbg("wait for event_thread to exit\n");
	down(&event_exit);
}


static int update_slot_info(struct slot *slot)
{
	struct hotplug_slot_info *info;
	/* char buffer[SLOT_NAME_SIZE]; */
	int result;

	info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	/* make_slot_name (&buffer[0], SLOT_NAME_SIZE, slot); */

	slot->hpc_ops->get_power_status(slot, &(info->power_status));
	slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
	slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
	slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));

	/* result = pci_hp_change_slot_info(buffer, info); */
	result = pci_hp_change_slot_info(slot->hotplug_slot, info);
	kfree (info);
	return result;
}

static void interrupt_event_handler(struct controller *ctrl)
{
	int loop = 0;
	int change = 1;
	struct pci_func *func;
	u8 hp_slot;
	u8 getstatus;
	struct slot *p_slot;

	while (change) {
		change = 0;

		for (loop = 0; loop < 10; loop++) {
			if (ctrl->event_queue[loop].event_type != 0) {
				hp_slot = ctrl->event_queue[loop].hp_slot;

				func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);

				p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

				dbg("hp_slot %d, func %p, p_slot %p\n", hp_slot, func, p_slot);

				if (ctrl->event_queue[loop].event_type == INT_BUTTON_CANCEL) {
					dbg("button cancel\n");
					del_timer(&p_slot->task_event);

					switch (p_slot->state) {
					case BLINKINGOFF_STATE:
						/* Wait for exclusive access to hardware */
						down(&ctrl->crit_sect);
						
						if (PWR_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->green_led_on(p_slot);
							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}
						if (ATTN_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->set_attention_status(p_slot, 0);

							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}
						/* Done with exclusive hardware access */
						up(&ctrl->crit_sect);
						break;
					case BLINKINGON_STATE:
						/* Wait for exclusive access to hardware */
						down(&ctrl->crit_sect);

						if (PWR_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->green_led_off(p_slot);
							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}
						if (ATTN_LED(ctrl->ctrlcap)){
							p_slot->hpc_ops->set_attention_status(p_slot, 0);
							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}
						/* Done with exclusive hardware access */
						up(&ctrl->crit_sect);

						break;
					default:
						warn("Not a valid state\n");
						return;
					}
					info(msg_button_cancel, p_slot->number);
					p_slot->state = STATIC_STATE;
				}
				/* ***********Button Pressed (No action on 1st press...) */
				else if (ctrl->event_queue[loop].event_type == INT_BUTTON_PRESS) {
					
					if (ATTN_BUTTN(ctrl->ctrlcap)) {
						dbg("Button pressed\n");
						p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
						if (getstatus) {
							/* slot is on */
							dbg("slot is on\n");
							p_slot->state = BLINKINGOFF_STATE;
							info(msg_button_off, p_slot->number);
						} else {
							/* slot is off */
							dbg("slot is off\n");
							p_slot->state = BLINKINGON_STATE;
							info(msg_button_on, p_slot->number);
						}

						/* Wait for exclusive access to hardware */
						down(&ctrl->crit_sect);

						/* blink green LED and turn off amber */
						if (PWR_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->green_led_blink(p_slot);
							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}

						if (ATTN_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->set_attention_status(p_slot, 0);

							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}

						/* Done with exclusive hardware access */
						up(&ctrl->crit_sect);

						init_timer(&p_slot->task_event);
						p_slot->task_event.expires = jiffies + 5 * HZ;   /* 5 second delay */
						p_slot->task_event.function = (void (*)(unsigned long)) pushbutton_helper_thread;
						p_slot->task_event.data = (unsigned long) p_slot;

						dbg("add_timer p_slot = %p\n", (void *) p_slot);
						add_timer(&p_slot->task_event);
					}
				}
				/***********POWER FAULT********************/
				else if (ctrl->event_queue[loop].event_type == INT_POWER_FAULT) {
					if (POWER_CTRL(ctrl->ctrlcap)) {
						dbg("power fault\n");
						/* Wait for exclusive access to hardware */
						down(&ctrl->crit_sect);

						if (ATTN_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->set_attention_status(p_slot, 1);
							wait_for_ctrl_irq (ctrl);
						}

						if (PWR_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->green_led_off(p_slot);
							wait_for_ctrl_irq (ctrl);
						}

						/* Done with exclusive hardware access */
						up(&ctrl->crit_sect);
					}
				}
				/***********SURPRISE REMOVAL********************/
				else if ((ctrl->event_queue[loop].event_type == INT_PRESENCE_ON) || 
					(ctrl->event_queue[loop].event_type == INT_PRESENCE_OFF)) {
					if (HP_SUPR_RM(ctrl->ctrlcap)) {
						dbg("Surprise Removal\n");
						if (p_slot) {
							surprise_rm_pending = (unsigned long) p_slot;
							up(&event_semaphore);
							update_slot_info(p_slot);
						}
					}
				} else {
					/* refresh notification */
					if (p_slot)
						update_slot_info(p_slot);
				}

				ctrl->event_queue[loop].event_type = 0;

				change = 1;
			}
		}		/* End of FOR loop */
	}
}


int pciehp_enable_slot(struct slot *p_slot)
{
	u8 getstatus = 0;
	int rc;
	struct pci_func *func;

	func = pciehp_slot_find(p_slot->bus, p_slot->device, 0);
	if (!func) {
		dbg("%s: Error! slot NULL\n", __FUNCTION__);
		return 1;
	}

	/* Check to see if (latch closed, card present, power off) */
	down(&p_slot->ctrl->crit_sect);

	rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
	if (rc || !getstatus) {
		info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
		up(&p_slot->ctrl->crit_sect);
		return 1;
	}
	if (MRL_SENS(p_slot->ctrl->ctrlcap)) {	
		rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
		if (rc || getstatus) {
			info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}
	
	if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {	
		rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
		if (rc || getstatus) {
			info("%s: already enabled on slot(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}
	up(&p_slot->ctrl->crit_sect);

	slot_remove(func);

	func = pciehp_slot_create(p_slot->bus);
	if (func == NULL)
		return 1;

	func->bus = p_slot->bus;
	func->device = p_slot->device;
	func->function = 0;
	func->configured = 0;
	func->is_a_board = 1;

	/* We have to save the presence info for these slots */
	p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	func->switch_save = !getstatus? 0x10:0;

	rc = board_added(func, p_slot->ctrl);
	if (rc) {
		if (is_bridge(func))
			bridge_slot_remove(func);
		else
			slot_remove(func);

		/* Setup slot structure with entry for empty slot */
		func = pciehp_slot_create(p_slot->bus);
		if (func == NULL)
			return 1;	/* Out of memory */

		func->bus = p_slot->bus;
		func->device = p_slot->device;
		func->function = 0;
		func->configured = 0;
		func->is_a_board = 1;

		/* We have to save the presence info for these slots */
		p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
		p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
		func->switch_save = !getstatus? 0x10:0;
	}

	if (p_slot)
		update_slot_info(p_slot);

	return rc;
}


int pciehp_disable_slot(struct slot *p_slot)
{
	u8 class_code, header_type, BCR;
	u8 index = 0;
	u8 getstatus = 0;
	u32 rc = 0;
	int ret = 0;
	unsigned int devfn;
	struct pci_bus *pci_bus = p_slot->ctrl->pci_dev->subordinate;
	struct pci_func *func;

	if (!p_slot->ctrl)
		return 1;

	/* Check to see if (latch closed, card present, power on) */
	down(&p_slot->ctrl->crit_sect);

	if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) {	
		ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
		if (ret || !getstatus) {
			info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}

	if (MRL_SENS(p_slot->ctrl->ctrlcap)) {	
		ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
		if (ret || getstatus) {
			info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}

	if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {	
		ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
		if (ret || !getstatus) {
			info("%s: already disabled slot(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}

	up(&p_slot->ctrl->crit_sect);

	func = pciehp_slot_find(p_slot->bus, p_slot->device, index++);

	/* Make sure there are no video controllers here
	 * for all func of p_slot
	 */
	while (func && !rc) {
		pci_bus->number = func->bus;
		devfn = PCI_DEVFN(func->device, func->function);

		/* Check the Class Code */
		rc = pci_bus_read_config_byte (pci_bus, devfn, 0x0B, &class_code);
		if (rc)
			return rc;

		if (class_code == PCI_BASE_CLASS_DISPLAY) {
			/* Display/Video adapter (not supported) */
			rc = REMOVE_NOT_SUPPORTED;
		} else {
			/* See if it's a bridge */
			rc = pci_bus_read_config_byte (pci_bus, devfn, PCI_HEADER_TYPE, &header_type);
			if (rc)
				return rc;

			/* If it's a bridge, check the VGA Enable bit */
			if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
				rc = pci_bus_read_config_byte (pci_bus, devfn, PCI_BRIDGE_CONTROL, &BCR);
				if (rc)
					return rc;

				/* If the VGA Enable bit is set, remove isn't supported */
				if (BCR & PCI_BRIDGE_CTL_VGA) {
					rc = REMOVE_NOT_SUPPORTED;
				}
			}
		}

		func = pciehp_slot_find(p_slot->bus, p_slot->device, index++);
	}

	func = pciehp_slot_find(p_slot->bus, p_slot->device, 0);
	if ((func != NULL) && !rc) {
		rc = remove_board(func, p_slot->ctrl);
	} else if (!rc)
		rc = 1;

	if (p_slot)
		update_slot_info(p_slot);

	return rc;
}


/**
 * configure_new_device - Configures the PCI header information of one board.
 *
 * @ctrl: pointer to controller structure
 * @func: pointer to function structure
 * @behind_bridge: 1 if this is a recursive call, 0 if not
 * @resources: pointer to set of resource lists
 *
 * Returns 0 if success
 *
 */
static u32 configure_new_device(struct controller * ctrl, struct pci_func * func,
	u8 behind_bridge, struct resource_lists * resources, u8 bridge_bus, u8 bridge_dev)
{
	u8 temp_byte, function, max_functions, stop_it;
	int rc;
	u32 ID;
	struct pci_func *new_slot;
	struct pci_bus lpci_bus, *pci_bus;
	int index;

	new_slot = func;

	dbg("%s\n", __FUNCTION__);
	memcpy(&lpci_bus, ctrl->pci_dev->subordinate, sizeof(lpci_bus));
	pci_bus = &lpci_bus;
	pci_bus->number = func->bus;

	/* Check for Multi-function device */
	rc = pci_bus_read_config_byte(pci_bus, PCI_DEVFN(func->device, func->function), 0x0E, &temp_byte);
	if (rc) {
		dbg("%s: rc = %d\n", __FUNCTION__, rc);
		return rc;
	}

	if (temp_byte & 0x80)	/* Multi-function device */
		max_functions = 8;
	else
		max_functions = 1;

	function = 0;

	do {
		rc = configure_new_function(ctrl, new_slot, behind_bridge,
					resources, bridge_bus, bridge_dev);

		if (rc) {
			dbg("configure_new_function failed: %d\n", rc);
			index = 0;

			while (new_slot) {
				new_slot = pciehp_slot_find(new_slot->bus,
						new_slot->device, index++);

				if (new_slot)
					pciehp_return_board_resources(new_slot,
						resources);
			}

			return rc;
		}

		function++;