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

// SPDX-License-Identifier: GPL-2.0+
/*
 * IBM Hot Plug Controller Driver
 *
 * Written By: Chuck Cole, Jyoti Shah, Tong Yu, Irene Zubarev, IBM Corporation
 *
 * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2001-2003 IBM Corp.
 *
 * All rights reserved.
 *
 * Send feedback to <gregkh@us.ibm.com>
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include "../pci.h"
#include <asm/pci_x86.h>		/* for struct irq_routing_table */
#include <asm/io_apic.h>
#include "ibmphp.h"

#define attn_on(sl)  ibmphp_hpc_writeslot(sl, HPC_SLOT_ATTNON)
#define attn_off(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_ATTNOFF)
#define attn_LED_blink(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_BLINKLED)
#define get_ctrl_revision(sl, rev) ibmphp_hpc_readslot(sl, READ_REVLEVEL, rev)
#define get_hpc_options(sl, opt) ibmphp_hpc_readslot(sl, READ_HPCOPTIONS, opt)

#define DRIVER_VERSION	"0.6"
#define DRIVER_DESC	"IBM Hot Plug PCI Controller Driver"

int ibmphp_debug;

static bool debug;
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRIVER_DESC);

struct pci_bus *ibmphp_pci_bus;
static int max_slots;

static int irqs[16];    /* PIC mode IRQs we're using so far (in case MPS
			 * tables don't provide default info for empty slots */

static int init_flag;

static inline int get_cur_bus_info(struct slot **sl)
{
	int rc = 1;
	struct slot *slot_cur = *sl;

	debug("options = %x\n", slot_cur->ctrl->options);
	debug("revision = %x\n", slot_cur->ctrl->revision);

	if (READ_BUS_STATUS(slot_cur->ctrl))
		rc = ibmphp_hpc_readslot(slot_cur, READ_BUSSTATUS, NULL);

	if (rc)
		return rc;

	slot_cur->bus_on->current_speed = CURRENT_BUS_SPEED(slot_cur->busstatus);
	if (READ_BUS_MODE(slot_cur->ctrl))
		slot_cur->bus_on->current_bus_mode =
				CURRENT_BUS_MODE(slot_cur->busstatus);
	else
		slot_cur->bus_on->current_bus_mode = 0xFF;

	debug("busstatus = %x, bus_speed = %x, bus_mode = %x\n",
			slot_cur->busstatus,
			slot_cur->bus_on->current_speed,
			slot_cur->bus_on->current_bus_mode);

	*sl = slot_cur;
	return 0;
}

static inline int slot_update(struct slot **sl)
{
	int rc;
	rc = ibmphp_hpc_readslot(*sl, READ_ALLSTAT, NULL);
	if (rc)
		return rc;
	if (!init_flag)
		rc = get_cur_bus_info(sl);
	return rc;
}

static int __init get_max_slots(void)
{
	struct slot *slot_cur;
	u8 slot_count = 0;

	list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
		/* sometimes the hot-pluggable slots start with 4 (not always from 1) */
		slot_count = max(slot_count, slot_cur->number);
	}
	return slot_count;
}

/* This routine will put the correct slot->device information per slot.  It's
 * called from initialization of the slot structures. It will also assign
 * interrupt numbers per each slot.
 * Parameters: struct slot
 * Returns 0 or errors
 */
int ibmphp_init_devno(struct slot **cur_slot)
{
	struct irq_routing_table *rtable;
	int len;
	int loop;
	int i;

	rtable = pcibios_get_irq_routing_table();
	if (!rtable) {
		err("no BIOS routing table...\n");
		return -ENOMEM;
	}

	len = (rtable->size - sizeof(struct irq_routing_table)) /
			sizeof(struct irq_info);

	if (!len) {
		kfree(rtable);
		return -1;
	}
	for (loop