linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (C) 2005-2006 Silicon Graphics, Inc. All rights reserved.

 *

 * This work was based on the 2.4/2.6 kernel development by Dick Reigner.

 * Work to add BIOS PROM support was completed by Mike Habeck.

 */

​

#include <linux/acpi.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/pci_hotplug.h>

#include <linux/proc_fs.h>

#include <linux/slab.h>

#include <linux/types.h>

#include <linux/mutex.h>

​

#include <asm/sn/addrs.h>

#include <asm/sn/geo.h>

#include <asm/sn/l1.h>

#include <asm/sn/module.h>

#include <asm/sn/pcibr_provider.h>

#include <asm/sn/pcibus_provider_defs.h>

#include <asm/sn/pcidev.h>

#include <asm/sn/sn_feature_sets.h>

#include <asm/sn/sn_sal.h>

#include <asm/sn/types.h>

#include <asm/sn/acpi.h>

​

#include "../pci.h"

​

MODULE_LICENSE("GPL");

MODULE_AUTHOR("SGI (prarit@sgi.com, dickie@sgi.com, habeck@sgi.com)");

MODULE_DESCRIPTION("SGI Altix Hot Plug PCI Controller Driver");

​

​

/* SAL call error codes. Keep in sync with prom header io/include/pcibr.h */

#define PCI_SLOT_ALREADY_UP     2   /* slot already up */

#define PCI_SLOT_ALREADY_DOWN       3   /* slot already down */

#define PCI_L1_ERR          7   /* L1 console command error */

#define PCI_EMPTY_33MHZ         15  /* empty 33 MHz bus */

​

​

#define PCIIO_ASIC_TYPE_TIOCA       4

#define PCI_L1_QSIZE            128 /* our L1 message buffer size */

#define SN_MAX_HP_SLOTS         32  /* max hotplug slots */

#define SN_SLOT_NAME_SIZE       33  /* size of name string */

​

/* internal list head */

static struct list_head sn_hp_list;

​

/* hotplug_slot struct's private pointer */

struct slot {

    int device_num;

    struct pci_bus *pci_bus;

    /* this struct for glue internal only */

    struct hotplug_slot hotplug_slot;

    struct list_head hp_list;

    char physical_path[SN_SLOT_NAME_SIZE];

};

​

struct pcibr_slot_enable_resp {

    int resp_sub_errno;

    char resp_l1_msg[PCI_L1_QSIZE + 1];

};

​

struct pcibr_slot_disable_resp {

    int resp_sub_errno;

    char resp_l1_msg[PCI_L1_QSIZE + 1];

};

​

enum sn_pci_req_e {

    PCI_REQ_SLOT_ELIGIBLE,

    PCI_REQ_SLOT_DISABLE

};

​

static int enable_slot(struct hotplug_slot *slot);

static int disable_slot(struct hotplug_slot *slot);

static inline int get_power_status(struct hotplug_slot *slot, u8 *value);

​

static const struct hotplug_slot_ops sn_hotplug_slot_ops = {

    .enable_slot            = enable_slot,

    .disable_slot           = disable_slot,

    .get_power_status       = get_power_status,

};

​

static DEFINE_MUTEX(sn_hotplug_mutex);

​

static struct slot *to_slot(struct hotplug_slot *bss_hotplug_slot)

{