linux-imx

/*

 * Driver for sTec s1120 PCIe SSDs. sTec was acquired in 2013 by HGST and HGST

 * was acquired by Western Digital in 2012.

 *

 * Copyright 2012 sTec, Inc.

 * Copyright (c) 2017 Western Digital Corporation or its affiliates.

 *

 * This file is part of the Linux kernel, and is made available under

 * the terms of the GNU General Public License version 2.

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/pci.h>

#include <linux/slab.h>

#include <linux/spinlock.h>

#include <linux/blkdev.h>

#include <linux/blk-mq.h>

#include <linux/sched.h>

#include <linux/interrupt.h>

#include <linux/compiler.h>

#include <linux/workqueue.h>

#include <linux/delay.h>

#include <linux/time.h>

#include <linux/hdreg.h>

#include <linux/dma-mapping.h>

#include <linux/completion.h>

#include <linux/scatterlist.h>

#include <linux/version.h>

#include <linux/err.h>

#include <linux/aer.h>

#include <linux/wait.h>

#include <linux/stringify.h>

#include <scsi/scsi.h>

#include <scsi/sg.h>

#include <linux/io.h>

#include <linux/uaccess.h>

#include <asm/unaligned.h>

​

#include "skd_s1120.h"

​

static int skd_dbg_level;

static int skd_isr_comp_limit = 4;

​

#define SKD_ASSERT(expr) \

    do { \

        if (unlikely(!(expr))) { \

            pr_err("Assertion failed! %s,%s,%s,line=%d\n",  \

                   # expr, __FILE__, __func__, __LINE__); \

        } \

    } while (0)

​

#define DRV_NAME "skd"

#define PFX DRV_NAME ": "

​

MODULE_LICENSE("GPL");

​

MODULE_DESCRIPTION("STEC s1120 PCIe SSD block driver");

​

#define PCI_VENDOR_ID_STEC      0x1B39

#define PCI_DEVICE_ID_S1120     0x0001

​

#define SKD_FUA_NV      (1 << 1)

#define SKD_MINORS_PER_DEVICE   16

​

#define SKD_MAX_QUEUE_DEPTH     200u

​

#define SKD_PAUSE_TIMEOUT       (5 * 1000)

​

#define SKD_N_FITMSG_BYTES      (512u)

#define SKD_MAX_REQ_PER_MSG 14

​

#define SKD_N_SPECIAL_FITMSG_BYTES      (128u)

​

/* SG elements are 32 bytes, so we can make this 4096 and still be under the

 * 128KB limit.  That allows 4096*4K = 16M xfer size

 */

#define SKD_N_SG_PER_REQ_DEFAULT 256u

​

#define SKD_N_COMPLETION_ENTRY  256u

#define SKD_N_READ_CAP_BYTES    (8u)

​

#define SKD_N_INTERNAL_BYTES    (512u)

​

#define SKD_SKCOMP_SIZE                         \

    ((sizeof(struct fit_completion_entry_v1) +          \

      sizeof(struct fit_comp_error_info)) * SKD_N_COMPLETION_ENTRY)

​

/* 5 bits of uniqifier, 0xF800 */

#define SKD_ID_TABLE_MASK       (3u << 8u)

#define  SKD_ID_RW_REQUEST      (0u << 8u)