cpqphp_core.c 35.7 KB
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/*
 * Compaq Hot Plug Controller Driver
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001 Greg Kroah-Hartman <greg@kroah.com>
 * Copyright (C) 2001 IBM Corp.
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <greg@kroah.com>
 *
 * Jan 12, 2003 -	Added 66/100/133MHz PCI-X support,
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 *			Torben Mathiasen <torben.mathiasen@hp.com>
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 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <linux/init.h>
#include <linux/interrupt.h>

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#include <linux/uaccess.h>
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#include "cpqphp.h"
#include "cpqphp_nvram.h"


/* Global variables */
int cpqhp_debug;
int cpqhp_legacy_mode;
struct controller *cpqhp_ctrl_list;	/* = NULL */
struct pci_func *cpqhp_slot_list[256];
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struct irq_routing_table *cpqhp_routing_table;
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/* local variables */
static void __iomem *smbios_table;
static void __iomem *smbios_start;
static void __iomem *cpqhp_rom_start;
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static bool power_mode;
static bool debug;
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static int initialized;
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#define DRIVER_VERSION	"0.9.8"
#define DRIVER_AUTHOR	"Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>"
#define DRIVER_DESC	"Compaq Hot Plug PCI Controller Driver"

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

module_param(power_mode, bool, 0644);
MODULE_PARM_DESC(power_mode, "Power mode enabled or not");

module_param(debug, bool, 0644);
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");

#define CPQHPC_MODULE_MINOR 208

static inline int is_slot64bit(struct slot *slot)
{
	return (readb(slot->p_sm_slot + SMBIOS_SLOT_WIDTH) == 0x06) ? 1 : 0;
}

static inline int is_slot66mhz(struct slot *slot)
{
	return (readb(slot->p_sm_slot + SMBIOS_SLOT_TYPE) == 0x0E) ? 1 : 0;
}

/**
 * detect_SMBIOS_pointer - find the System Management BIOS Table in mem region.
 * @begin: begin pointer for region to be scanned.
 * @end: end pointer for region to be scanned.
 *
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 * Returns pointer to the head of the SMBIOS tables (or %NULL).
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 */
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static void __iomem *detect_SMBIOS_pointer(void __iomem *begin, void __iomem *end)
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{
	void __iomem *fp;
	void __iomem *endp;
	u8 temp1, temp2, temp3, temp4;
	int status = 0;

	endp = (end - sizeof(u32) + 1);

	for (fp = begin; fp <= endp; fp += 16) {
		temp1 = readb(fp);
		temp2 = readb(fp+1);
		temp3 = readb(fp+2);
		temp4 = readb(fp+3);
		if (temp1 == '_' &&
		    temp2 == 'S' &&
		    temp3 == 'M' &&
		    temp4 == '_') {
			status = 1;
			break;
		}
	}
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	if (!status)
		fp = NULL;

	dbg("Discovered SMBIOS Entry point at %p\n", fp);

	return fp;
}

/**
 * init_SERR - Initializes the per slot SERR generation.
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 * @ctrl: controller to use
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 *
 * For unexpected switch opens
 */
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static int init_SERR(struct controller *ctrl)
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{
	u32 tempdword;
	u32 number_of_slots;
	u8 physical_slot;

	if (!ctrl)
		return 1;

	tempdword = ctrl->first_slot;

	number_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0F;
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	/* Loop through slots */
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	while (number_of_slots) {
		physical_slot = tempdword;
		writeb(0, ctrl->hpc_reg + SLOT_SERR);
		tempdword++;
		number_of_slots--;
	}

	return 0;
}

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static int init_cpqhp_routing_table(void)
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{
	int len;

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	cpqhp_routing_table = pcibios_get_irq_routing_table();
	if (cpqhp_routing_table == NULL)
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		return -ENOMEM;

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	len = cpqhp_routing_table_length();
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	if (len == 0) {
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		kfree(cpqhp_routing_table);
		cpqhp_routing_table = NULL;
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		return -1;
	}

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	return 0;
}

/* nice debugging output */
static void pci_print_IRQ_route(void)
{
	int len;
	int loop;
	u8 tbus, tdevice, tslot;

	len = cpqhp_routing_table_length();
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	dbg("bus dev func slot\n");
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	for (loop = 0; loop < len; ++loop) {
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		tbus = cpqhp_routing_table->slots[loop].bus;
		tdevice = cpqhp_routing_table->slots[loop].devfn;
		tslot = cpqhp_routing_table->slots[loop].slot;
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		dbg("%d %d %d %d\n", tbus, tdevice >> 3, tdevice & 0x7, tslot);

	}
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	return;
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}


/**
 * get_subsequent_smbios_entry: get the next entry from bios table.
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 * @smbios_start: where to start in the SMBIOS table
 * @smbios_table: location of the SMBIOS table
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 * @curr: %NULL or pointer to previously returned structure
 *
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 * Gets the first entry if previous == NULL;
 * otherwise, returns the next entry.
 * Uses global SMBIOS Table pointer.
 *
 * Returns a pointer to an SMBIOS structure or NULL if none found.
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 */
static void __iomem *get_subsequent_smbios_entry(void __iomem *smbios_start,
						void __iomem *smbios_table,
						void __iomem *curr)
{
	u8 bail = 0;
	u8 previous_byte = 1;
	void __iomem *p_temp;
	void __iomem *p_max;

	if (!smbios_table || !curr)
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		return NULL;
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	/* set p_max to the end of the table */
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	p_max = smbios_start + readw(smbios_table + ST_LENGTH);

	p_temp = curr;
	p_temp += readb(curr + SMBIOS_GENERIC_LENGTH);

	while ((p_temp < p_max) && !bail) {
		/* Look for the double NULL terminator
		 * The first condition is the previous byte
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		 * and the second is the curr
		 */
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		if (!previous_byte && !(readb(p_temp)))
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			bail = 1;

		previous_byte = readb(p_temp);
		p_temp++;
	}

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	if (p_temp < p_max)
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		return p_temp;
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	else
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		return NULL;
}


/**
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 * get_SMBIOS_entry - return the requested SMBIOS entry or %NULL
 * @smbios_start: where to start in the SMBIOS table
 * @smbios_table: location of the SMBIOS table
 * @type: SMBIOS structure type to be returned
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 * @previous: %NULL or pointer to previously returned structure
 *
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 * Gets the first entry of the specified type if previous == %NULL;
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 * Otherwise, returns the next entry of the given type.
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 * Uses global SMBIOS Table pointer.
 * Uses get_subsequent_smbios_entry.
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 *
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 * Returns a pointer to an SMBIOS structure or %NULL if none found.
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 */
static void __iomem *get_SMBIOS_entry(void __iomem *smbios_start,
					void __iomem *smbios_table,
					u8 type,
					void __iomem *previous)
{
	if (!smbios_table)
		return NULL;

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	if (!previous)
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		previous = smbios_start;
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	else
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		previous = get_subsequent_smbios_entry(smbios_start,
					smbios_table, previous);

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	while (previous)
		if (readb(previous + SMBIOS_GENERIC_TYPE) != type)
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			previous = get_subsequent_smbios_entry(smbios_start,
						smbios_table, previous);
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		else
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			break;

	return previous;
}

static void release_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;

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	dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
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	kfree(slot->hotplug_slot->info);
	kfree(slot->hotplug_slot);
	kfree(slot);
}

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static int ctrl_slot_cleanup(struct controller *ctrl)
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{
	struct slot *old_slot, *next_slot;

	old_slot = ctrl->slot;
	ctrl->slot = NULL;

	while (old_slot) {
		/* memory will be freed by the release_slot callback */
		next_slot = old_slot->next;
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		pci_hp_deregister(old_slot->hotplug_slot);
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		old_slot = next_slot;
	}

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	cpqhp_remove_debugfs_files(ctrl);

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	/* Free IRQ associated with hot plug device */
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	free_irq(ctrl->interrupt, ctrl);
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	/* Unmap the memory */
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	iounmap(ctrl->hpc_reg);
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	/* Finally reclaim PCI mem */
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	release_mem_region(pci_resource_start(ctrl->pci_dev, 0),
			   pci_resource_len(ctrl->pci_dev, 0));

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	return 0;
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}


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/**
 * get_slot_mapping - determine logical slot mapping for PCI device
 *
 * Won't work for more than one PCI-PCI bridge in a slot.
 *
 * @bus_num - bus number of PCI device
 * @dev_num - device number of PCI device
 * @slot - Pointer to u8 where slot number will	be returned
 *
 * Output:	SUCCESS or FAILURE
 */
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static int
get_slot_mapping(struct pci_bus *bus, u8 bus_num, u8 dev_num, u8 *slot)
{
	u32 work;
	long len;
	long loop;

	u8 tbus, tdevice, tslot, bridgeSlot;

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	dbg("%s: %p, %d, %d, %p\n", __func__, bus, bus_num, dev_num, slot);
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	bridgeSlot = 0xFF;

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	len = cpqhp_routing_table_length();
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	for (loop = 0; loop < len; ++loop) {
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		tbus = cpqhp_routing_table->slots[loop].bus;
		tdevice = cpqhp_routing_table->slots[loop].devfn >> 3;
		tslot = cpqhp_routing_table->slots[loop].slot;
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		if ((tbus == bus_num) && (tdevice == dev_num)) {
			*slot = tslot;
			return 0;
		} else {
			/* Did not get a match on the target PCI device. Check
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			 * if the current IRQ table entry is a PCI-to-PCI
			 * bridge device.  If so, and it's secondary bus
			 * matches the bus number for the target device, I need
			 * to save the bridge's slot number.  If I can not find
			 * an entry for the target device, I will have to
			 * assume it's on the other side of the bridge, and
			 * assign it the bridge's slot.
			 */
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			bus->number = tbus;
			pci_bus_read_config_dword(bus, PCI_DEVFN(tdevice, 0),
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						PCI_CLASS_REVISION, &work);
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			if ((work >> 8) == PCI_TO_PCI_BRIDGE_CLASS) {
				pci_bus_read_config_dword(bus,
							PCI_DEVFN(tdevice, 0),
							PCI_PRIMARY_BUS, &work);
				// See if bridge's secondary bus matches target bus.
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				if (((work >> 8) & 0x000000FF) == (long) bus_num)
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					bridgeSlot = tslot;
			}
		}

	}

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	/* If we got here, we didn't find an entry in the IRQ mapping table for
	 * the target PCI device.  If we did determine that the target device
	 * is on the other side of a PCI-to-PCI bridge, return the slot number
	 * for the bridge.
	 */
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	if (bridgeSlot != 0xFF) {
		*slot = bridgeSlot;
		return 0;
	}
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	/* Couldn't find an entry in the routing table for this PCI device */
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	return -1;
}


/**
 * cpqhp_set_attention_status - Turns the Amber LED for a slot on or off
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 * @ctrl: struct controller to use
 * @func: PCI device/function info
 * @status: LED control flag: 1 = LED on, 0 = LED off
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 */
static int
cpqhp_set_attention_status(struct controller *ctrl, struct pci_func *func,
				u32 status)
{
	u8 hp_slot;

	if (func == NULL)
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		return 1;
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	hp_slot = func->device - ctrl->slot_device_offset;

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	/* Wait for exclusive access to hardware */
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	mutex_lock(&ctrl->crit_sect);
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	if (status == 1)
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		amber_LED_on(ctrl, hp_slot);
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	else if (status == 0)
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		amber_LED_off(ctrl, hp_slot);
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	else {
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		/* Done with exclusive hardware access */
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		mutex_unlock(&ctrl->crit_sect);
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		return 1;
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	}

	set_SOGO(ctrl);

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	/* Wait for SOBS to be unset */
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	wait_for_ctrl_irq(ctrl);
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	/* Done with exclusive hardware access */
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	mutex_unlock(&ctrl->crit_sect);
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	return 0;
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}


/**
 * set_attention_status - Turns the Amber LED for a slot on or off
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 * @hotplug_slot: slot to change LED on
 * @status: LED control flag
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 */
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static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
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{
	struct pci_func *slot_func;
	struct slot *slot = hotplug_slot->private;
	struct controller *ctrl = slot->ctrl;
	u8 bus;
	u8 devfn;
	u8 device;
	u8 function;

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	dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
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	if (cpqhp_get_bus_dev(ctrl, &bus, &devfn, slot->number) == -1)
		return -ENODEV;

	device = devfn >> 3;
	function = devfn & 0x7;
	dbg("bus, dev, fn = %d, %d, %d\n", bus, device, function);

	slot_func = cpqhp_slot_find(bus, device, function);
	if (!slot_func)
		return -ENODEV;

	return cpqhp_set_attention_status(ctrl, slot_func, status);
}


static int process_SI(struct hotplug_slot *hotplug_slot)
{
	struct pci_func *slot_func;
	struct slot *slot = hotplug_slot->private;
	struct controller *ctrl = slot->ctrl;
	u8 bus;
	u8 devfn;
	u8 device;
	u8 function;

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	dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
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	if (cpqhp_get_bus_dev(ctrl, &bus, &devfn, slot->number) == -1)
		return -ENODEV;

	device = devfn >> 3;
	function = devfn & 0x7;
	dbg("bus, dev, fn = %d, %d, %d\n", bus, device, function);

	slot_func = cpqhp_slot_find(bus, device, function);
	if (!slot_func)
		return -ENODEV;

	slot_func->bus = bus;
	slot_func->device = device;
	slot_func->function = function;
	slot_func->configured = 0;
	dbg("board_added(%p, %p)\n", slot_func, ctrl);
	return cpqhp_process_SI(ctrl, slot_func);
}


static int process_SS(struct hotplug_slot *hotplug_slot)
{
	struct pci_func *slot_func;
	struct slot *slot = hotplug_slot->private;
	struct controller *ctrl = slot->ctrl;
	u8 bus;
	u8 devfn;
	u8 device;
	u8 function;

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	dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
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	if (cpqhp_get_bus_dev(ctrl, &bus, &devfn, slot->number) == -1)
		return -ENODEV;

	device = devfn >> 3;
	function = devfn & 0x7;
	dbg("bus, dev, fn = %d, %d, %d\n", bus, device, function);

	slot_func = cpqhp_slot_find(bus, device, function);
	if (!slot_func)
		return -ENODEV;

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	dbg("In %s, slot_func = %p, ctrl = %p\n", __func__, slot_func, ctrl);
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	return cpqhp_process_SS(ctrl, slot_func);
}


static int hardware_test(struct hotplug_slot *hotplug_slot, u32 value)
{
	struct slot *slot = hotplug_slot->private;
	struct controller *ctrl = slot->ctrl;

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	dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
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	return cpqhp_hardware_test(ctrl, value);
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}


static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	struct controller *ctrl = slot->ctrl;

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	dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
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	*value = get_slot_enabled(ctrl, slot);
	return 0;
}

static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	struct controller *ctrl = slot->ctrl;
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	dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
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	*value = cpq_get_attention_status(ctrl, slot);
	return 0;
}

static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	struct controller *ctrl = slot->ctrl;

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	dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
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	*value = cpq_get_latch_status(ctrl, slot);

	return 0;
}

static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	struct controller *ctrl = slot->ctrl;

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	dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
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	*value = get_presence_status(ctrl, slot);

	return 0;
}

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static struct hotplug_slot_ops cpqphp_hotplug_slot_ops = {
	.set_attention_status =	set_attention_status,
	.enable_slot =		process_SI,
	.disable_slot =		process_SS,
	.hardware_test =	hardware_test,
	.get_power_status =	get_power_status,
	.get_attention_status =	get_attention_status,
	.get_latch_status =	get_latch_status,
	.get_adapter_status =	get_adapter_status,
};

#define SLOT_NAME_SIZE 10

static int ctrl_slot_setup(struct controller *ctrl,
			void __iomem *smbios_start,
			void __iomem *smbios_table)
{
	struct slot *slot;
	struct hotplug_slot *hotplug_slot;
	struct hotplug_slot_info *hotplug_slot_info;
606
	struct pci_bus *bus = ctrl->pci_bus;
607 608 609 610 611 612
	u8 number_of_slots;
	u8 slot_device;
	u8 slot_number;
	u8 ctrl_slot;
	u32 tempdword;
	char name[SLOT_NAME_SIZE];
B
Bogicevic Sasa 已提交
613
	void __iomem *slot_entry = NULL;
614
	int result;
615 616 617 618 619 620 621 622 623 624 625

	dbg("%s\n", __func__);

	tempdword = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);

	number_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0F;
	slot_device = readb(ctrl->hpc_reg + SLOT_MASK) >> 4;
	slot_number = ctrl->first_slot;

	while (number_of_slots) {
		slot = kzalloc(sizeof(*slot), GFP_KERNEL);
626 627
		if (!slot) {
			result = -ENOMEM;
628
			goto error;
629
		}
630 631 632

		slot->hotplug_slot = kzalloc(sizeof(*(slot->hotplug_slot)),
						GFP_KERNEL);
633 634
		if (!slot->hotplug_slot) {
			result = -ENOMEM;
635
			goto error_slot;
636
		}
637 638
		hotplug_slot = slot->hotplug_slot;

639
		hotplug_slot->info = kzalloc(sizeof(*(hotplug_slot->info)),
640
							GFP_KERNEL);
641 642
		if (!hotplug_slot->info) {
			result = -ENOMEM;
643
			goto error_hpslot;
644
		}
645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677
		hotplug_slot_info = hotplug_slot->info;

		slot->ctrl = ctrl;
		slot->bus = ctrl->bus;
		slot->device = slot_device;
		slot->number = slot_number;
		dbg("slot->number = %u\n", slot->number);

		slot_entry = get_SMBIOS_entry(smbios_start, smbios_table, 9,
					slot_entry);

		while (slot_entry && (readw(slot_entry + SMBIOS_SLOT_NUMBER) !=
				slot->number)) {
			slot_entry = get_SMBIOS_entry(smbios_start,
						smbios_table, 9, slot_entry);
		}

		slot->p_sm_slot = slot_entry;

		init_timer(&slot->task_event);
		slot->task_event.expires = jiffies + 5 * HZ;
		slot->task_event.function = cpqhp_pushbutton_thread;

		/*FIXME: these capabilities aren't used but if they are
		 *	 they need to be correctly implemented
		 */
		slot->capabilities |= PCISLOT_REPLACE_SUPPORTED;
		slot->capabilities |= PCISLOT_INTERLOCK_SUPPORTED;

		if (is_slot64bit(slot))
			slot->capabilities |= PCISLOT_64_BIT_SUPPORTED;
		if (is_slot66mhz(slot))
			slot->capabilities |= PCISLOT_66_MHZ_SUPPORTED;
678
		if (bus->cur_bus_speed == PCI_SPEED_66MHz)
679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708
			slot->capabilities |= PCISLOT_66_MHZ_OPERATION;

		ctrl_slot =
			slot_device - (readb(ctrl->hpc_reg + SLOT_MASK) >> 4);

		/* Check presence */
		slot->capabilities |=
			((((~tempdword) >> 23) |
			 ((~tempdword) >> 15)) >> ctrl_slot) & 0x02;
		/* Check the switch state */
		slot->capabilities |=
			((~tempdword & 0xFF) >> ctrl_slot) & 0x01;
		/* Check the slot enable */
		slot->capabilities |=
			((read_slot_enable(ctrl) << 2) >> ctrl_slot) & 0x04;

		/* register this slot with the hotplug pci core */
		hotplug_slot->release = &release_slot;
		hotplug_slot->private = slot;
		snprintf(name, SLOT_NAME_SIZE, "%u", slot->number);
		hotplug_slot->ops = &cpqphp_hotplug_slot_ops;

		hotplug_slot_info->power_status = get_slot_enabled(ctrl, slot);
		hotplug_slot_info->attention_status =
			cpq_get_attention_status(ctrl, slot);
		hotplug_slot_info->latch_status =
			cpq_get_latch_status(ctrl, slot);
		hotplug_slot_info->adapter_status =
			get_presence_status(ctrl, slot);

709
		dbg("registering bus %d, dev %d, number %d, ctrl->slot_device_offset %d, slot %d\n",
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
				slot->bus, slot->device,
				slot->number, ctrl->slot_device_offset,
				slot_number);
		result = pci_hp_register(hotplug_slot,
					 ctrl->pci_dev->bus,
					 slot->device,
					 name);
		if (result) {
			err("pci_hp_register failed with error %d\n", result);
			goto error_info;
		}

		slot->next = ctrl->slot;
		ctrl->slot = slot;

		number_of_slots--;
		slot_device++;
		slot_number++;
	}

	return 0;
error_info:
	kfree(hotplug_slot_info);
error_hpslot:
	kfree(hotplug_slot);
error_slot:
	kfree(slot);
error:
	return result;
}

static int one_time_init(void)
{
	int loop;
	int retval = 0;

	if (initialized)
		return 0;

	power_mode = 0;

751
	retval = init_cpqhp_routing_table();
752 753 754
	if (retval)
		goto error;

755 756 757
	if (cpqhp_debug)
		pci_print_IRQ_route();

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758
	dbg("Initialize + Start the notification mechanism\n");
759 760 761 762 763 764

	retval = cpqhp_event_start_thread();
	if (retval)
		goto error;

	dbg("Initialize slot lists\n");
765
	for (loop = 0; loop < 256; loop++)
766 767 768 769 770 771 772 773 774
		cpqhp_slot_list[loop] = NULL;

	/* FIXME: We also need to hook the NMI handler eventually.
	 * this also needs to be worked with Christoph
	 * register_NMI_handler();
	 */
	/* Map rom address */
	cpqhp_rom_start = ioremap(ROM_PHY_ADDR, ROM_PHY_LEN);
	if (!cpqhp_rom_start) {
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775
		err("Could not ioremap memory region for ROM\n");
776 777 778 779 780 781 782 783 784 785 786 787 788
		retval = -EIO;
		goto error;
	}

	/* Now, map the int15 entry point if we are on compaq specific
	 * hardware
	 */
	compaq_nvram_init(cpqhp_rom_start);

	/* Map smbios table entry point structure */
	smbios_table = detect_SMBIOS_pointer(cpqhp_rom_start,
					cpqhp_rom_start + ROM_PHY_LEN);
	if (!smbios_table) {
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		err("Could not find the SMBIOS pointer in memory\n");
790 791 792 793 794 795 796
		retval = -EIO;
		goto error_rom_start;
	}

	smbios_start = ioremap(readl(smbios_table + ST_ADDRESS),
					readw(smbios_table + ST_LENGTH));
	if (!smbios_start) {
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		err("Could not ioremap memory region taken from SMBIOS values\n");
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813
		retval = -EIO;
		goto error_smbios_start;
	}

	initialized = 1;

	return retval;

error_smbios_start:
	iounmap(smbios_start);
error_rom_start:
	iounmap(cpqhp_rom_start);
error:
	return retval;
}

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static int cpqhpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	u8 num_of_slots = 0;
	u8 hp_slot = 0;
	u8 device;
	u8 bus_cap;
	u16 temp_word;
	u16 vendor_id;
	u16 subsystem_vid;
	u16 subsystem_deviceid;
	u32 rc;
	struct controller *ctrl;
	struct pci_func *func;
827
	struct pci_bus *bus;
828 829 830 831 832 833 834 835
	int err;

	err = pci_enable_device(pdev);
	if (err) {
		printk(KERN_ERR MY_NAME ": cannot enable PCI device %s (%d)\n",
			pci_name(pdev), err);
		return err;
	}
836

837
	bus = pdev->subordinate;
838
	if (!bus) {
839
		dev_notice(&pdev->dev, "the device is not a bridge, skipping\n");
840 841 842
		rc = -ENODEV;
		goto err_disable_device;
	}
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844 845 846
	/* Need to read VID early b/c it's used to differentiate CPQ and INTC
	 * discovery
	 */
847 848 849
	vendor_id = pdev->vendor;
	if ((vendor_id != PCI_VENDOR_ID_COMPAQ) &&
	    (vendor_id != PCI_VENDOR_ID_INTEL)) {
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850
		err(msg_HPC_non_compaq_or_intel);
851 852
		rc = -ENODEV;
		goto err_disable_device;
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	}
	dbg("Vendor ID: %x\n", vendor_id);

856 857
	dbg("revision: %d\n", pdev->revision);
	if ((vendor_id == PCI_VENDOR_ID_COMPAQ) && (!pdev->revision)) {
L
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858
		err(msg_HPC_rev_error);
859 860
		rc = -ENODEV;
		goto err_disable_device;
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861 862
	}

863
	/* Check for the proper subsystem IDs
864
	 * Intel uses a different SSID programming model than Compaq.
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865
	 * For Intel, each SSID bit identifies a PHP capability.
866
	 * Also Intel HPCs may have RID=0.
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	 */
868 869
	if ((pdev->revision <= 2) && (vendor_id != PCI_VENDOR_ID_INTEL)) {
		err(msg_HPC_not_supported);
870 871
		rc = -ENODEV;
		goto err_disable_device;
872 873 874 875 876
	}

	/* TODO: This code can be made to support non-Compaq or Intel
	 * subsystem IDs
	 */
877
	subsystem_vid = pdev->subsystem_vendor;
878 879 880 881 882 883 884 885 886 887 888 889 890 891
	dbg("Subsystem Vendor ID: %x\n", subsystem_vid);
	if ((subsystem_vid != PCI_VENDOR_ID_COMPAQ) && (subsystem_vid != PCI_VENDOR_ID_INTEL)) {
		err(msg_HPC_non_compaq_or_intel);
		rc = -ENODEV;
		goto err_disable_device;
	}

	ctrl = kzalloc(sizeof(struct controller), GFP_KERNEL);
	if (!ctrl) {
		err("%s : out of memory\n", __func__);
		rc = -ENOMEM;
		goto err_disable_device;
	}

892
	subsystem_deviceid = pdev->subsystem_device;
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913

	info("Hot Plug Subsystem Device ID: %x\n", subsystem_deviceid);

	/* Set Vendor ID, so it can be accessed later from other
	 * functions
	 */
	ctrl->vendor_id = vendor_id;

	switch (subsystem_vid) {
	case PCI_VENDOR_ID_COMPAQ:
		if (pdev->revision >= 0x13) { /* CIOBX */
			ctrl->push_flag = 1;
			ctrl->slot_switch_type = 1;
			ctrl->push_button = 1;
			ctrl->pci_config_space = 1;
			ctrl->defeature_PHP = 1;
			ctrl->pcix_support = 1;
			ctrl->pcix_speed_capability = 1;
			pci_read_config_byte(pdev, 0x41, &bus_cap);
			if (bus_cap & 0x80) {
				dbg("bus max supports 133MHz PCI-X\n");
914
				bus->max_bus_speed = PCI_SPEED_133MHz_PCIX;
915 916 917 918
				break;
			}
			if (bus_cap & 0x40) {
				dbg("bus max supports 100MHz PCI-X\n");
919
				bus->max_bus_speed = PCI_SPEED_100MHz_PCIX;
920 921
				break;
			}
922
			if (bus_cap & 0x20) {
923
				dbg("bus max supports 66MHz PCI-X\n");
924
				bus->max_bus_speed = PCI_SPEED_66MHz_PCIX;
925 926
				break;
			}
927
			if (bus_cap & 0x10) {
928
				dbg("bus max supports 66MHz PCI\n");
929
				bus->max_bus_speed = PCI_SPEED_66MHz;
930 931
				break;
			}
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Linus Torvalds 已提交
932

933
			break;
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934 935
		}

936 937 938 939
		switch (subsystem_deviceid) {
		case PCI_SUB_HPC_ID:
			/* Original 6500/7000 implementation */
			ctrl->slot_switch_type = 1;
940
			bus->max_bus_speed = PCI_SPEED_33MHz;
941 942 943 944 945 946 947 948 949 950
			ctrl->push_button = 0;
			ctrl->pci_config_space = 1;
			ctrl->defeature_PHP = 1;
			ctrl->pcix_support = 0;
			ctrl->pcix_speed_capability = 0;
			break;
		case PCI_SUB_HPC_ID2:
			/* First Pushbutton implementation */
			ctrl->push_flag = 1;
			ctrl->slot_switch_type = 1;
951
			bus->max_bus_speed = PCI_SPEED_33MHz;
952 953 954 955 956 957 958 959 960
			ctrl->push_button = 1;
			ctrl->pci_config_space = 1;
			ctrl->defeature_PHP = 1;
			ctrl->pcix_support = 0;
			ctrl->pcix_speed_capability = 0;
			break;
		case PCI_SUB_HPC_ID_INTC:
			/* Third party (6500/7000) */
			ctrl->slot_switch_type = 1;
961
			bus->max_bus_speed = PCI_SPEED_33MHz;
962 963 964 965 966 967 968 969 970 971
			ctrl->push_button = 0;
			ctrl->pci_config_space = 1;
			ctrl->defeature_PHP = 1;
			ctrl->pcix_support = 0;
			ctrl->pcix_speed_capability = 0;
			break;
		case PCI_SUB_HPC_ID3:
			/* First 66 Mhz implementation */
			ctrl->push_flag = 1;
			ctrl->slot_switch_type = 1;
972
			bus->max_bus_speed = PCI_SPEED_66MHz;
973 974 975 976 977 978 979 980 981 982
			ctrl->push_button = 1;
			ctrl->pci_config_space = 1;
			ctrl->defeature_PHP = 1;
			ctrl->pcix_support = 0;
			ctrl->pcix_speed_capability = 0;
			break;
		case PCI_SUB_HPC_ID4:
			/* First PCI-X implementation, 100MHz */
			ctrl->push_flag = 1;
			ctrl->slot_switch_type = 1;
983
			bus->max_bus_speed = PCI_SPEED_100MHz_PCIX;
984 985 986 987 988 989 990 991 992
			ctrl->push_button = 1;
			ctrl->pci_config_space = 1;
			ctrl->defeature_PHP = 1;
			ctrl->pcix_support = 1;
			ctrl->pcix_speed_capability = 0;
			break;
		default:
			err(msg_HPC_not_supported);
			rc = -ENODEV;
L
Linus Torvalds 已提交
993 994
			goto err_free_ctrl;
		}
995
		break;
L
Linus Torvalds 已提交
996

997 998 999
	case PCI_VENDOR_ID_INTEL:
		/* Check for speed capability (0=33, 1=66) */
		if (subsystem_deviceid & 0x0001)
1000
			bus->max_bus_speed = PCI_SPEED_66MHz;
1001
		else
1002
			bus->max_bus_speed = PCI_SPEED_33MHz;
L
Linus Torvalds 已提交
1003

1004 1005 1006 1007 1008
		/* Check for push button */
		if (subsystem_deviceid & 0x0002)
			ctrl->push_button = 0;
		else
			ctrl->push_button = 1;
L
Linus Torvalds 已提交
1009

1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028
		/* Check for slot switch type (0=mechanical, 1=not mechanical) */
		if (subsystem_deviceid & 0x0004)
			ctrl->slot_switch_type = 0;
		else
			ctrl->slot_switch_type = 1;

		/* PHP Status (0=De-feature PHP, 1=Normal operation) */
		if (subsystem_deviceid & 0x0008)
			ctrl->defeature_PHP = 1;	/* PHP supported */
		else
			ctrl->defeature_PHP = 0;	/* PHP not supported */

		/* Alternate Base Address Register Interface
		 * (0=not supported, 1=supported)
		 */
		if (subsystem_deviceid & 0x0010)
			ctrl->alternate_base_address = 1;
		else
			ctrl->alternate_base_address = 0;
L
Linus Torvalds 已提交
1029

1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
		/* PCI Config Space Index (0=not supported, 1=supported) */
		if (subsystem_deviceid & 0x0020)
			ctrl->pci_config_space = 1;
		else
			ctrl->pci_config_space = 0;

		/* PCI-X support */
		if (subsystem_deviceid & 0x0080) {
			ctrl->pcix_support = 1;
			if (subsystem_deviceid & 0x0040)
				/* 133MHz PCI-X if bit 7 is 1 */
				ctrl->pcix_speed_capability = 1;
			else
				/* 100MHz PCI-X if bit 7 is 1 and bit 0 is 0, */
				/* 66MHz PCI-X if bit 7 is 1 and bit 0 is 1 */
				ctrl->pcix_speed_capability = 0;
		} else {
			/* Conventional PCI */
			ctrl->pcix_support = 0;
			ctrl->pcix_speed_capability = 0;
L
Linus Torvalds 已提交
1050
		}
1051
		break;
L
Linus Torvalds 已提交
1052

1053
	default:
L
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1054
		err(msg_HPC_not_supported);
1055 1056
		rc = -ENODEV;
		goto err_free_ctrl;
L
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1057 1058
	}

1059
	/* Tell the user that we found one. */
L
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1060 1061 1062 1063
	info("Initializing the PCI hot plug controller residing on PCI bus %d\n",
					pdev->bus->number);

	dbg("Hotplug controller capabilities:\n");
1064
	dbg("    speed_capability       %d\n", bus->max_bus_speed);
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1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082
	dbg("    slot_switch_type       %s\n", ctrl->slot_switch_type ?
					"switch present" : "no switch");
	dbg("    defeature_PHP          %s\n", ctrl->defeature_PHP ?
					"PHP supported" : "PHP not supported");
	dbg("    alternate_base_address %s\n", ctrl->alternate_base_address ?
					"supported" : "not supported");
	dbg("    pci_config_space       %s\n", ctrl->pci_config_space ?
					"supported" : "not supported");
	dbg("    pcix_speed_capability  %s\n", ctrl->pcix_speed_capability ?
					"supported" : "not supported");
	dbg("    pcix_support           %s\n", ctrl->pcix_support ?
					"supported" : "not supported");

	ctrl->pci_dev = pdev;
	pci_set_drvdata(pdev, ctrl);

	/* make our own copy of the pci bus structure,
	 * as we like tweaking it a lot */
J
Julia Lawall 已提交
1083
	ctrl->pci_bus = kmemdup(pdev->bus, sizeof(*ctrl->pci_bus), GFP_KERNEL);
L
Linus Torvalds 已提交
1084 1085 1086 1087 1088 1089 1090
	if (!ctrl->pci_bus) {
		err("out of memory\n");
		rc = -ENOMEM;
		goto err_free_ctrl;
	}

	ctrl->bus = pdev->bus->number;
1091
	ctrl->rev = pdev->revision;
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1092 1093 1094
	dbg("bus device function rev: %d %d %d %d\n", ctrl->bus,
		PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn), ctrl->rev);

1095
	mutex_init(&ctrl->crit_sect);
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1096 1097 1098 1099
	init_waitqueue_head(&ctrl->queue);

	/* initialize our threads if they haven't already been started up */
	rc = one_time_init();
1100
	if (rc)
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1101
		goto err_free_bus;
1102

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1103
	dbg("pdev = %p\n", pdev);
1104 1105
	dbg("pci resource start %llx\n", (unsigned long long)pci_resource_start(pdev, 0));
	dbg("pci resource len %llx\n", (unsigned long long)pci_resource_len(pdev, 0));
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1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116

	if (!request_mem_region(pci_resource_start(pdev, 0),
				pci_resource_len(pdev, 0), MY_NAME)) {
		err("cannot reserve MMIO region\n");
		rc = -ENOMEM;
		goto err_free_bus;
	}

	ctrl->hpc_reg = ioremap(pci_resource_start(pdev, 0),
					pci_resource_len(pdev, 0));
	if (!ctrl->hpc_reg) {
1117 1118 1119
		err("cannot remap MMIO region %llx @ %llx\n",
		    (unsigned long long)pci_resource_len(pdev, 0),
		    (unsigned long long)pci_resource_start(pdev, 0));
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1120 1121 1122 1123
		rc = -ENODEV;
		goto err_free_mem_region;
	}

1124
	/* Check for 66Mhz operation */
1125
	bus->cur_bus_speed = get_controller_speed(ctrl);
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1126 1127 1128 1129 1130 1131 1132 1133 1134


	/********************************************************
	 *
	 *              Save configuration headers for this and
	 *              subordinate PCI buses
	 *
	 ********************************************************/

1135
	/* find the physical slot number of the first hot plug slot */
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1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151

	/* Get slot won't work for devices behind bridges, but
	 * in this case it will always be called for the "base"
	 * bus/dev/func of a slot.
	 * CS: this is leveraging the PCIIRQ routing code from the kernel
	 * (pci-pc.c: get_irq_routing_table) */
	rc = get_slot_mapping(ctrl->pci_bus, pdev->bus->number,
				(readb(ctrl->hpc_reg + SLOT_MASK) >> 4),
				&(ctrl->first_slot));
	dbg("get_slot_mapping: first_slot = %d, returned = %d\n",
				ctrl->first_slot, rc);
	if (rc) {
		err(msg_initialization_err, rc);
		goto err_iounmap;
	}

1152
	/* Store PCI Config Space for all devices on this bus */
L
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	rc = cpqhp_save_config(ctrl, ctrl->bus, readb(ctrl->hpc_reg + SLOT_MASK));
	if (rc) {
		err("%s: unable to save PCI configuration data, error %d\n",
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				__func__, rc);
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		goto err_iounmap;
	}

	/*
	 * Get IO, memory, and IRQ resources for new devices
	 */
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	/* The next line is required for cpqhp_find_available_resources */
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	ctrl->interrupt = pdev->irq;
	if (ctrl->interrupt < 0x10) {
		cpqhp_legacy_mode = 1;
		dbg("System seems to be configured for Full Table Mapped MPS mode\n");
	}

	ctrl->cfgspc_irq = 0;
	pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &ctrl->cfgspc_irq);

	rc = cpqhp_find_available_resources(ctrl, cpqhp_rom_start);
	ctrl->add_support = !rc;
	if (rc) {
		dbg("cpqhp_find_available_resources = 0x%x\n", rc);
		err("unable to locate PCI configuration resources for hot plug add.\n");
		goto err_iounmap;
	}

	/*
	 * Finish setting up the hot plug ctrl device
	 */
	ctrl->slot_device_offset = readb(ctrl->hpc_reg + SLOT_MASK) >> 4;
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	dbg("NumSlots %d\n", ctrl->slot_device_offset);
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	ctrl->next_event = 0;

	/* Setup the slot information structures */
	rc = ctrl_slot_setup(ctrl, smbios_start, smbios_table);
	if (rc) {
		err(msg_initialization_err, 6);
		err("%s: unable to save PCI configuration data, error %d\n",
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			__func__, rc);
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		goto err_iounmap;
	}
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	/* Mask all general input interrupts */
	writel(0xFFFFFFFFL, ctrl->hpc_reg + INT_MASK);

	/* set up the interrupt */
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	dbg("HPC interrupt = %d\n", ctrl->interrupt);
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	if (request_irq(ctrl->interrupt, cpqhp_ctrl_intr,
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			IRQF_SHARED, MY_NAME, ctrl)) {
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		err("Can't get irq %d for the hotplug pci controller\n",
			ctrl->interrupt);
		rc = -ENODEV;
		goto err_iounmap;
	}

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	/* Enable Shift Out interrupt and clear it, also enable SERR on power
	 * fault
	 */
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	temp_word = readw(ctrl->hpc_reg + MISC);
	temp_word |= 0x4006;
	writew(temp_word, ctrl->hpc_reg + MISC);

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	/* Changed 05/05/97 to clear all interrupts at start */
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	writel(0xFFFFFFFFL, ctrl->hpc_reg + INT_INPUT_CLEAR);

	ctrl->ctrl_int_comp = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);

	writel(0x0L, ctrl->hpc_reg + INT_MASK);

	if (!cpqhp_ctrl_list) {
		cpqhp_ctrl_list = ctrl;
		ctrl->next = NULL;
	} else {
		ctrl->next = cpqhp_ctrl_list;
		cpqhp_ctrl_list = ctrl;
	}

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	/* turn off empty slots here unless command line option "ON" set
	 * Wait for exclusive access to hardware
	 */
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	mutex_lock(&ctrl->crit_sect);
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	num_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0F;

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	/* find first device number for the ctrl */
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	device = readb(ctrl->hpc_reg + SLOT_MASK) >> 4;

	while (num_of_slots) {
		dbg("num_of_slots: %d\n", num_of_slots);
		func = cpqhp_slot_find(ctrl->bus, device, 0);
		if (!func)
			break;

		hp_slot = func->device - ctrl->slot_device_offset;
		dbg("hp_slot: %d\n", hp_slot);

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		/* We have to save the presence info for these slots */
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		temp_word = ctrl->ctrl_int_comp >> 16;
		func->presence_save = (temp_word >> hp_slot) & 0x01;
		func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;

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		if (ctrl->ctrl_int_comp & (0x1L << hp_slot))
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			func->switch_save = 0;
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		else
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			func->switch_save = 0x10;

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		if (!power_mode)
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			if (!func->is_a_board) {
				green_LED_off(ctrl, hp_slot);
				slot_disable(ctrl, hp_slot);
			}

		device++;
		num_of_slots--;
	}

	if (!power_mode) {
		set_SOGO(ctrl);
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		/* Wait for SOBS to be unset */
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		wait_for_ctrl_irq(ctrl);
	}

	rc = init_SERR(ctrl);
	if (rc) {
		err("init_SERR failed\n");
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		mutex_unlock(&ctrl->crit_sect);
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		goto err_free_irq;
	}

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	/* Done with exclusive hardware access */
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	mutex_unlock(&ctrl->crit_sect);
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	cpqhp_create_debugfs_files(ctrl);
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	return 0;

err_free_irq:
	free_irq(ctrl->interrupt, ctrl);
err_iounmap:
	iounmap(ctrl->hpc_reg);
err_free_mem_region:
	release_mem_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
err_free_bus:
	kfree(ctrl->pci_bus);
err_free_ctrl:
	kfree(ctrl);
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err_disable_device:
	pci_disable_device(pdev);
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	return rc;
}

static void __exit unload_cpqphpd(void)
{
	struct pci_func *next;
	struct pci_func *TempSlot;
	int loop;
	u32 rc;
	struct controller *ctrl;
	struct controller *tctrl;
	struct pci_resource *res;
	struct pci_resource *tres;

	rc = compaq_nvram_store(cpqhp_rom_start);

	ctrl = cpqhp_ctrl_list;

	while (ctrl) {
		if (ctrl->hpc_reg) {
			u16 misc;
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			rc = read_slot_enable(ctrl);
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			writeb(0, ctrl->hpc_reg + SLOT_SERR);
			writel(0xFFFFFFC0L | ~rc, ctrl->hpc_reg + INT_MASK);
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			misc = readw(ctrl->hpc_reg + MISC);
			misc &= 0xFFFD;
			writew(misc, ctrl->hpc_reg + MISC);
		}

		ctrl_slot_cleanup(ctrl);

		res = ctrl->io_head;
		while (res) {
			tres = res;
			res = res->next;
			kfree(tres);
		}

		res = ctrl->mem_head;
		while (res) {
			tres = res;
			res = res->next;
			kfree(tres);
		}

		res = ctrl->p_mem_head;
		while (res) {
			tres = res;
			res = res->next;
			kfree(tres);
		}

		res = ctrl->bus_head;
		while (res) {
			tres = res;
			res = res->next;
			kfree(tres);
		}

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		kfree(ctrl->pci_bus);
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		tctrl = ctrl;
		ctrl = ctrl->next;
		kfree(tctrl);
	}

	for (loop = 0; loop < 256; loop++) {
		next = cpqhp_slot_list[loop];
		while (next != NULL) {
			res = next->io_head;
			while (res) {
				tres = res;
				res = res->next;
				kfree(tres);
			}

			res = next->mem_head;
			while (res) {
				tres = res;
				res = res->next;
				kfree(tres);
			}

			res = next->p_mem_head;
			while (res) {
				tres = res;
				res = res->next;
				kfree(tres);
			}

			res = next->bus_head;
			while (res) {
				tres = res;
				res = res->next;
				kfree(tres);
			}

			TempSlot = next;
			next = next->next;
			kfree(TempSlot);
		}
	}

1409
	/* Stop the notification mechanism */
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	if (initialized)
		cpqhp_event_stop_thread();
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	/* unmap the rom address */
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	if (cpqhp_rom_start)
		iounmap(cpqhp_rom_start);
	if (smbios_start)
		iounmap(smbios_start);
}

static struct pci_device_id hpcd_pci_tbl[] = {
	{
	/* handle any PCI Hotplug controller */
	.class =        ((PCI_CLASS_SYSTEM_PCI_HOTPLUG << 8) | 0x00),
	.class_mask =   ~0,
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	/* no matter who makes it */
	.vendor =       PCI_ANY_ID,
	.device =       PCI_ANY_ID,
	.subvendor =    PCI_ANY_ID,
	.subdevice =    PCI_ANY_ID,
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	}, { /* end: all zeroes */ }
};

MODULE_DEVICE_TABLE(pci, hpcd_pci_tbl);

static struct pci_driver cpqhpc_driver = {
	.name =		"compaq_pci_hotplug",
	.id_table =	hpcd_pci_tbl,
	.probe =	cpqhpc_probe,
	/* remove:	cpqhpc_remove_one, */
};

static int __init cpqhpc_init(void)
{
	int result;

	cpqhp_debug = debug;

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	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
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	cpqhp_initialize_debugfs();
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	result = pci_register_driver(&cpqhpc_driver);
	dbg("pci_register_driver = %d\n", result);
	return result;
}

static void __exit cpqhpc_cleanup(void)
{
	dbg("unload_cpqphpd()\n");
	unload_cpqphpd();

	dbg("pci_unregister_driver\n");
	pci_unregister_driver(&cpqhpc_driver);
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	cpqhp_shutdown_debugfs();
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}

module_init(cpqhpc_init);
module_exit(cpqhpc_cleanup);