path: root/drivers/thunderbolt/switch.c

/*
 * 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/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 DEF