// SPDX-License-Identifier: GPL-2.0
/*
* Thunderbolt Cactus Ridge driver - switch/port utility functions
*
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
*/
#include <linux/delay.h>
#include <linux/idr.h>
#include <linux/nvmem-provider.h>
#include <linux/pm_runtime.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include "tb.h"
/* Switch authorization from userspace is serialized by this lock */
static DEFINE_MUTEX(switch_lock);
/* Switch NVM support */
#define NVM_DEVID 0x05
#define NVM_VERSION 0x08
#define NVM_CSS 0x10
#define NVM_FLASH_SIZE 0x45
#define NVM_MIN_SIZE SZ_32K
#define NVM_MAX_SIZE SZ_512K
static DEFINE_IDA(nvm_ida);
struct nvm_auth_status {
struct list_head list;
uuid_t uuid;
u32 status;
};
/*
* Hold NVM authentication failure status per switch This information
* needs to stay around even when the switch gets power cycled so we
* keep it separately.
*/
static LIST_HEAD(nvm_auth_status_cache);
static DEFINE_MUTEX(nvm_auth_status_lock);
static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
{
struct nvm_auth_status *st;
list_for_each_entry(st, &nvm_auth_status_cache, list) {
if (uuid_equal(&st->uuid, sw->uuid))
return st;
}
return NULL;
}
static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
{
struct nvm_auth_status *st;
mutex_lock(&nvm_auth_status_lock);
st = __nvm_get_auth_status(sw);
mutex_unlock(&nvm_auth_status_lock);
*status = st ? st->status : 0;
}
static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
{
struct nvm_auth_status *st;
if (WARN_ON(!sw->uuid))
return;
mutex_lock(&nvm_auth_status_lock);
st = __nvm_get_auth_status(sw);
if (!st) {
st = kzalloc(sizeof(*st), GFP_KERNEL);
if (!st)
goto unlock;
memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
INIT_LIST_HEAD(&st->list);
list_add_tail(&st->list, &nvm_auth_status_cache);
}
st->status = status;
unlock:
mutex_unlock(&nvm_auth_status_lock);
}
static void nvm_clear_auth_status(const struct tb_switch *sw)
{
struct nvm_auth_status *st;
mutex_lock(&nvm_auth_status_lock);
st = __nvm_get_auth_status(sw)
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