path: root/drivers/pci/hotplug/cpqphp_core.c

/*
 * 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,
 * 			Torben Mathiasen <torben.mathiasen@hp.com>
 *
 */

#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>
#include <linux/pci_hotplug.h>
#include <linux/init.h>
#include <linux/interrupt.h>

#include <asm/uaccess.h>

#include "cpqphp.h"
#include "cpqphp_nvram.h"
#include "../../../arch/i386/pci/pci.h"	/* horrible hack showing how processor dependent we are... */


/* Global variables */
int cpqhp_debug;
int cpqhp_legacy_mode;
struct controller *cpqhp_ctrl_list;	/* = NULL */
struct pci_func *cpqhp_slot_list[256];

/* local variables */
static void __iomem *smbios_table;
static void __iomem *smbios_start;
static void __iomem *cpqhp_rom_start;
static int power_mode;
static int debug;
static int initialized;

#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 int one_time_init	(void);
static int set_attention_status	(struct hotplug_slot *slot, u8 value);
static int process_SI		(struct hotplug_slot *slot);
static int process_SS		(struct hotplug_slot *slot);
static int hardware_test	(struct hotplug_slot *slot, u32 value);
static int get_power_status	(struct hotplug_slot *slot, u8 *value);
static int get_attention_status	(struct hotplug_slot *slot, u8 *value);
static int get_latch_status	(struct hotplug_slot *slot, u8 *value);
static int get_adapter_status	(struct hotplug_slot *slot, u8 *value);
static int get_max_bus_speed	(struct hotplug_slot *slot, enum pci_bus_speed *value);
static int get_cur_bus_speed	(struct hotplug_slot *slot, enum pci_bus_speed *value);

static struct hotplug_slot_ops cpqphp_hotplug_slot_ops = {
	.owner =		THIS_MODULE,
	.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,
  	.get_max_bus_speed =	get_max_bus_speed,
  	.get_cur_bus_speed =	get_cur_bus_speed,
};


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.
 *
 * Returns pointer to the head of the SMBIOS tables (or NULL)
 *
 */
static void __iomem * detect_SMBIOS_pointer(void __iomem *begin, void __iomem *end)
{
	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;
		}
	}
	
	if (!status)
		fp = NULL;

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

	return fp;
}

/**
 * init_SERR - Initializes the per slot SERR generation.
 *
 * For unexpected switch opens
 *
 */
static int init_SERR(struct controller * ctrl)
{
	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;
	// Loop through slots
	while (number_of_slots) {
		physical_slot = tempdword;
		writeb(0, ctrl->hpc_reg + SLOT_SERR);
		tempdword++;
		number_of_slots--;
	}

	return 0;
}


/* nice debugging output */
static int pci_print_IRQ_route (void)
{
	struct irq_routing_table *routing_table;
	int len;
	int loop;

	u8 tbus, tdevice, tslot;

	routing_table = pcibios_get_irq_routing_table();
	if (routing_table == NULL) {
		err("No BIOS Routing Table??? Not good\n");
		return -ENOMEM;
	}

	len = (routing_table->size - sizeof(struct irq_routing_table)) /
			sizeof(struct irq_info);
	// Make sure I got at least one entry
	if (len == 0) {
		kfree(routing_table);
		return -1;
	}

	dbg("bus dev func slot\n");

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

	}
	kfree(routing_table);
	return 0;
}


/**
 * get_subsequent_smbios_entry: get the next entry from bios table.
 *
 * Gets the first entry if previous == NULL
 * Otherwise, returns the next entry
 * Uses global SMBIOS Table pointer
 *
 * @curr: %NULL or pointer to previously returned structure
 *
 * returns a pointer to an SMBIOS structure or NULL if none found
 */
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)
		return(NULL);

	// set p_max to the end of the table
	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
		 * and the second is the curr */
		if (!previous_byte && !(readb(p_temp))) {
			bail = 1;
		}

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

	if (p_temp < p_max) {
		return p_temp;
	} else {
		return NUL