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mbcs.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (c) 2005 Silicon Graphics, Inc.  All rights reserved.
 */

/*
 *    MOATB Core Services driver.
 */

#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/mm.h>
#include <linux/uio.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/sn/addrs.h>
#include <asm/sn/intr.h>
#include <asm/sn/tiocx.h>
#include "mbcs.h"

#define MBCS_DEBUG 0
#if MBCS_DEBUG
#define DBG(fmt...)    printk(KERN_ALERT fmt)
#else
#define DBG(fmt...)
#endif
static int mbcs_major;

static LIST_HEAD(soft_list);

/*
 * file operations
 */
static const struct file_operations mbcs_ops = {
      .open = mbcs_open,
      .llseek = mbcs_sram_llseek,
      .read = mbcs_sram_read,
      .write = mbcs_sram_write,
      .mmap = mbcs_gscr_mmap,
};

struct mbcs_callback_arg {
      int minor;
      struct cx_dev *cx_dev;
};

static inline void mbcs_getdma_init(struct getdma *gdma)
{
      memset(gdma, 0, sizeof(struct getdma));
      gdma->DoneIntEnable = 1;
}

static inline void mbcs_putdma_init(struct putdma *pdma)
{
      memset(pdma, 0, sizeof(struct putdma));
      pdma->DoneIntEnable = 1;
}

static inline void mbcs_algo_init(struct algoblock *algo_soft)
{
      memset(algo_soft, 0, sizeof(struct algoblock));
}

static inline void mbcs_getdma_set(void *mmr,
                   uint64_t hostAddr,
                   uint64_t localAddr,
                   uint64_t localRamSel,
                   uint64_t numPkts,
                   uint64_t amoEnable,
                   uint64_t intrEnable,
                   uint64_t peerIO,
                   uint64_t amoHostDest,
                   uint64_t amoModType, uint64_t intrHostDest,
                   uint64_t intrVector)
{
      union dma_control rdma_control;
      union dma_amo_dest amo_dest;
      union intr_dest intr_dest;
      union dma_localaddr local_addr;
      union dma_hostaddr host_addr;

      rdma_control.dma_control_reg = 0;
      amo_dest.dma_amo_dest_reg = 0;
      intr_dest.intr_dest_reg = 0;
      local_addr.dma_localaddr_reg = 0;
      host_addr.dma_hostaddr_reg = 0;

      host_addr.dma_sys_addr = hostAddr;
      MBCS_MMR_SET(mmr, MBCS_RD_DMA_SYS_ADDR, host_addr.dma_hostaddr_reg);

      local_addr.dma_ram_addr = localAddr;
      local_addr.dma_ram_sel = localRamSel;
      MBCS_MMR_SET(mmr, MBCS_RD_DMA_LOC_ADDR, local_addr.dma_localaddr_reg);

      rdma_control.dma_op_length = numPkts;
      rdma_control.done_amo_en = amoEnable;
      rdma_control.done_int_en = intrEnable;
      rdma_control.pio_mem_n = peerIO;
      MBCS_MMR_SET(mmr, MBCS_RD_DMA_CTRL, rdma_control.dma_control_reg);

      amo_dest.dma_amo_sys_addr = amoHostDest;
      amo_dest.dma_amo_mod_type = amoModType;
      MBCS_MMR_SET(mmr, MBCS_RD_DMA_AMO_DEST, amo_dest.dma_amo_dest_reg);

      intr_dest.address = intrHostDest;
      intr_dest.int_vector = intrVector;
      MBCS_MMR_SET(mmr, MBCS_RD_DMA_INT_DEST, intr_dest.intr_dest_reg);

}

static inline void mbcs_putdma_set(void *mmr,
                   uint64_t hostAddr,
                   uint64_t localAddr,
                   uint64_t localRamSel,
                   uint64_t numPkts,
                   uint64_t amoEnable,
                   uint64_t intrEnable,
                   uint64_t peerIO,
                   uint64_t amoHostDest,
                   uint64_t amoModType,
                   uint64_t intrHostDest, uint64_t intrVector)
{
      union dma_control wdma_control;
      union dma_amo_dest amo_dest;
      union intr_dest intr_dest;
      union dma_localaddr local_addr;
      union dma_hostaddr host_addr;

      wdma_control.dma_control_reg = 0;
      amo_dest.dma_amo_dest_reg = 0;
      intr_dest.intr_dest_reg = 0;
      local_addr.dma_localaddr_reg = 0;
      host_addr.dma_hostaddr_reg = 0;

      host_addr.dma_sys_addr = hostAddr;
      MBCS_MMR_SET(mmr, MBCS_WR_DMA_SYS_ADDR, host_addr.dma_hostaddr_reg);

      local_addr.dma_ram_addr = localAddr;
      local_addr.dma_ram_sel = localRamSel;
      MBCS_MMR_SET(mmr, MBCS_WR_DMA_LOC_ADDR, local_addr.dma_localaddr_reg);

      wdma_control.dma_op_length = numPkts;
      wdma_control.done_amo_en = amoEnable;
      wdma_control.done_int_en = intrEnable;
      wdma_control.pio_mem_n = peerIO;
      MBCS_MMR_SET(mmr, MBCS_WR_DMA_CTRL, wdma_control.dma_control_reg);

      amo_dest.dma_amo_sys_addr = amoHostDest;
      amo_dest.dma_amo_mod_type = amoModType;
      MBCS_MMR_SET(mmr, MBCS_WR_DMA_AMO_DEST, amo_dest.dma_amo_dest_reg);

      intr_dest.address = intrHostDest;
      intr_dest.int_vector = intrVector;
      MBCS_MMR_SET(mmr, MBCS_WR_DMA_INT_DEST, intr_dest.intr_dest_reg);

}

static inline void mbcs_algo_set(void *mmr,
                 uint64_t amoHostDest,
                 uint64_t amoModType,
                 uint64_t intrHostDest,
                 uint64_t intrVector, uint64_t algoStepCount)
{
      union dma_amo_dest amo_dest;
      union intr_dest intr_dest;
      union algo_step step;

      step.algo_step_reg = 0;
      intr_dest.intr_dest_reg = 0;
      amo_dest.dma_amo_dest_reg = 0;

      amo_dest.dma_amo_sys_addr = amoHostDest;
      amo_dest.dma_amo_mod_type = amoModType;
      MBCS_MMR_SET(mmr, MBCS_ALG_AMO_DEST, amo_dest.dma_amo_dest_reg);

      intr_dest.address = intrHostDest;
      intr_dest.int_vector = intrVector;
      MBCS_MMR_SET(mmr, MBCS_ALG_INT_DEST, intr_dest.intr_dest_reg);

      step.alg_step_cnt = algoStepCount;
      MBCS_MMR_SET(mmr, MBCS_ALG_STEP, step.algo_step_reg);
}

static inline int mbcs_getdma_start(struct mbcs_soft *soft)
{
      void *mmr_base;
      struct getdma *gdma;
      uint64_t numPkts;
      union cm_control cm_control;

      mmr_base = soft->mmr_base;
      gdma = &soft->getdma;

      /* check that host address got setup */
      if (!gdma->hostAddr)
            return -1;

      numPkts =
          (gdma->bytes + (MBCS_CACHELINE_SIZE - 1)) / MBCS_CACHELINE_SIZE;

      /* program engine */
      mbcs_getdma_set(mmr_base, tiocx_dma_addr(gdma->hostAddr),
               gdma->localAddr,
               (gdma->localAddr < MB2) ? 0 :
               (gdma->localAddr < MB4) ? 1 :
               (gdma->localAddr < MB6) ? 2 : 3,
               numPkts,
               gdma->DoneAmoEnable,
               gdma->DoneIntEnable,
               gdma->peerIO,
               gdma->amoHostDest,
               gdma->amoModType,
               gdma->intrHostDest, gdma->intrVector);

      /* start engine */
      cm_control.cm_control_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
      cm_control.rd_dma_go = 1;
      MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);

      return 0;

}

static inline int mbcs_putdma_start(struct mbcs_soft *soft)
{
      void *mmr_base;
      struct putdma *pdma;
      uint64_t numPkts;
      union cm_control cm_control;

      mmr_base = soft->mmr_base;
      pdma = &soft->putdma;

      /* check that host address got setup */
      if (!pdma->hostAddr)
            return -1;

      numPkts =
          (pdma->bytes + (MBCS_CACHELINE_SIZE - 1)) / MBCS_CACHELINE_SIZE;

      /* program engine */
      mbcs_putdma_set(mmr_base, tiocx_dma_addr(pdma->hostAddr),
               pdma->localAddr,
               (pdma->localAddr < MB2) ? 0 :
               (pdma->localAddr < MB4) ? 1 :
               (pdma->localAddr < MB6) ? 2 : 3,
               numPkts,
               pdma->DoneAmoEnable,
               pdma->DoneIntEnable,
               pdma->peerIO,
               pdma->amoHostDest,
               pdma->amoModType,
               pdma->intrHostDest, pdma->intrVector);

      /* start engine */
      cm_control.cm_control_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
      cm_control.wr_dma_go = 1;
      MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);

      return 0;

}

static inline int mbcs_algo_start(struct mbcs_soft *soft)
{
      struct algoblock *algo_soft = &soft->algo;
      void *mmr_base = soft->mmr_base;
      union cm_control cm_control;

      if (down_interruptible(&soft->algolock))
            return -ERESTARTSYS;

      atomic_set(&soft->algo_done, 0);

      mbcs_algo_set(mmr_base,
             algo_soft->amoHostDest,
             algo_soft->amoModType,
             algo_soft->intrHostDest,
             algo_soft->intrVector, algo_soft->algoStepCount);

      /* start algorithm */
      cm_control.cm_control_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
      cm_control.alg_done_int_en = 1;
      cm_control.alg_go = 1;
      MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);

      up(&soft->algolock);

      return 0;
}

static inline ssize_t
do_mbcs_sram_dmawrite(struct mbcs_soft *soft, uint64_t hostAddr,
                  size_t len, loff_t * off)
{
      int rv = 0;

      if (down_interruptible(&soft->dmawritelock))
            return -ERESTARTSYS;

      atomic_set(&soft->dmawrite_done, 0);

      soft->putdma.hostAddr = hostAddr;
      soft->putdma.localAddr = *off;
      soft->putdma.bytes = len;

      if (mbcs_putdma_start(soft) < 0) {
            DBG(KERN_ALERT "do_mbcs_sram_dmawrite: "
                              "mbcs_putdma_start failed\n");
            rv = -EAGAIN;
            goto dmawrite_exit;
      }

      if (wait_event_interruptible(soft->dmawrite_queue,
                              atomic_read(&soft->dmawrite_done))) {
            rv = -ERESTARTSYS;
            goto dmawrite_exit;
      }

      rv = len;
      *off += len;

dmawrite_exit:
      up(&soft->dmawritelock);

      return rv;
}

static inline ssize_t
do_mbcs_sram_dmaread(struct mbcs_soft *soft, uint64_t hostAddr,
                 size_t len, loff_t * off)
{
      int rv = 0;

      if (down_interruptible(&soft->dmareadlock))
            return -ERESTARTSYS;

      atomic_set(&soft->dmawrite_done, 0);

      soft->getdma.hostAddr = hostAddr;
      soft->getdma.localAddr = *off;
      soft->getdma.bytes = len;

      if (mbcs_getdma_start(soft) < 0) {
            DBG(KERN_ALERT "mbcs_strategy: mbcs_getdma_start failed\n");
            rv = -EAGAIN;
            goto dmaread_exit;
      }

      if (wait_event_interruptible(soft->dmaread_queue,
                              atomic_read(&soft->dmaread_done))) {
            rv = -ERESTARTSYS;
            goto dmaread_exit;
      }

      rv = len;
      *off += len;

dmaread_exit:
      up(&soft->dmareadlock);

      return rv;
}

static int mbcs_open(struct inode *ip, struct file *fp)
{
      struct mbcs_soft *soft;
      int minor;

      minor = iminor(ip);

      list_for_each_entry(soft, &soft_list, list) {
            if (soft->nasid == minor) {
                  fp->private_data = soft->cxdev;
                  return 0;
            }
      }

      return -ENODEV;
}

static ssize_t mbcs_sram_read(struct file * fp, char __user *buf, size_t len, loff_t * off)
{
      struct cx_dev *cx_dev = fp->private_data;
      struct mbcs_soft *soft = cx_dev->soft;
      uint64_t hostAddr;
      int rv = 0;

      hostAddr = __get_dma_pages(GFP_KERNEL, get_order(len));
      if (hostAddr == 0)
            return -ENOMEM;

      rv = do_mbcs_sram_dmawrite(soft, hostAddr, len, off);
      if (rv < 0)
            goto exit;

      if (copy_to_user(buf, (void *)hostAddr, len))
            rv = -EFAULT;

      exit:
      free_pages(hostAddr, get_order(len));

      return rv;
}

static ssize_t
mbcs_sram_write(struct file * fp, const char __user *buf, size_t len, loff_t * off)
{
      struct cx_dev *cx_dev = fp->private_data;
      struct mbcs_soft *soft = cx_dev->soft;
      uint64_t hostAddr;
      int rv = 0;

      hostAddr = __get_dma_pages(GFP_KERNEL, get_order(len));
      if (hostAddr == 0)
            return -ENOMEM;

      if (copy_from_user((void *)hostAddr, buf, len)) {
            rv = -EFAULT;
            goto exit;
      }

      rv = do_mbcs_sram_dmaread(soft, hostAddr, len, off);

      exit:
      free_pages(hostAddr, get_order(len));

      return rv;
}

static loff_t mbcs_sram_llseek(struct file * filp, loff_t off, int whence)
{
      loff_t newpos;

      switch (whence) {
      case SEEK_SET:
            newpos = off;
            break;

      case SEEK_CUR:
            newpos = filp->f_pos + off;
            break;

      case SEEK_END:
            newpos = MBCS_SRAM_SIZE + off;
            break;

      default:          /* can't happen */
            return -EINVAL;
      }

      if (newpos < 0)
            return -EINVAL;

      filp->f_pos = newpos;

      return newpos;
}

static uint64_t mbcs_pioaddr(struct mbcs_soft *soft, uint64_t offset)
{
      uint64_t mmr_base;

      mmr_base = (uint64_t) (soft->mmr_base + offset);

      return mmr_base;
}

static void mbcs_debug_pioaddr_set(struct mbcs_soft *soft)
{
      soft->debug_addr = mbcs_pioaddr(soft, MBCS_DEBUG_START);
}

static void mbcs_gscr_pioaddr_set(struct mbcs_soft *soft)
{
      soft->gscr_addr = mbcs_pioaddr(soft, MBCS_GSCR_START);
}

static int mbcs_gscr_mmap(struct file *fp, struct vm_area_struct *vma)
{
      struct cx_dev *cx_dev = fp->private_data;
      struct mbcs_soft *soft = cx_dev->soft;

      if (vma->vm_pgoff != 0)
            return -EINVAL;

      vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

      /* Remap-pfn-range will mark the range VM_IO and VM_RESERVED */
      if (remap_pfn_range(vma,
                      vma->vm_start,
                      __pa(soft->gscr_addr) >> PAGE_SHIFT,
                      PAGE_SIZE,
                      vma->vm_page_prot))
            return -EAGAIN;

      return 0;
}

/**
 * mbcs_completion_intr_handler - Primary completion handler.
 * @irq: irq
 * @arg: soft struct for device
 *
 */
static irqreturn_t
mbcs_completion_intr_handler(int irq, void *arg)
{
      struct mbcs_soft *soft = (struct mbcs_soft *)arg;
      void *mmr_base;
      union cm_status cm_status;
      union cm_control cm_control;

      mmr_base = soft->mmr_base;
      cm_status.cm_status_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_STATUS);

      if (cm_status.rd_dma_done) {
            /* stop dma-read engine, clear status */
            cm_control.cm_control_reg =
                MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
            cm_control.rd_dma_clr = 1;
            MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL,
                       cm_control.cm_control_reg);
            atomic_set(&soft->dmaread_done, 1);
            wake_up(&soft->dmaread_queue);
      }
      if (cm_status.wr_dma_done) {
            /* stop dma-write engine, clear status */
            cm_control.cm_control_reg =
                MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
            cm_control.wr_dma_clr = 1;
            MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL,
                       cm_control.cm_control_reg);
            atomic_set(&soft->dmawrite_done, 1);
            wake_up(&soft->dmawrite_queue);
      }
      if (cm_status.alg_done) {
            /* clear status */
            cm_control.cm_control_reg =
                MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
            cm_control.alg_done_clr = 1;
            MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL,
                       cm_control.cm_control_reg);
            atomic_set(&soft->algo_done, 1);
            wake_up(&soft->algo_queue);
      }

      return IRQ_HANDLED;
}

/**
 * mbcs_intr_alloc - Allocate interrupts.
 * @dev: device pointer
 *
 */
static int mbcs_intr_alloc(struct cx_dev *dev)
{
      struct sn_irq_info *sn_irq;
      struct mbcs_soft *soft;
      struct getdma *getdma;
      struct putdma *putdma;
      struct algoblock *algo;

      soft = dev->soft;
      getdma = &soft->getdma;
      putdma = &soft->putdma;
      algo = &soft->algo;

      soft->get_sn_irq = NULL;
      soft->put_sn_irq = NULL;
      soft->algo_sn_irq = NULL;

      sn_irq = tiocx_irq_alloc(dev->cx_id.nasid, TIOCX_CORELET, -1, -1, -1);
      if (sn_irq == NULL)
            return -EAGAIN;
      soft->get_sn_irq = sn_irq;
      getdma->intrHostDest = sn_irq->irq_xtalkaddr;
      getdma->intrVector = sn_irq->irq_irq;
      if (request_irq(sn_irq->irq_irq,
                  (void *)mbcs_completion_intr_handler, IRQF_SHARED,
                  "MBCS get intr", (void *)soft)) {
            tiocx_irq_free(soft->get_sn_irq);
            return -EAGAIN;
      }

      sn_irq = tiocx_irq_alloc(dev->cx_id.nasid, TIOCX_CORELET, -1, -1, -1);
      if (sn_irq == NULL) {
            free_irq(soft->get_sn_irq->irq_irq, soft);
            tiocx_irq_free(soft->get_sn_irq);
            return -EAGAIN;
      }
      soft->put_sn_irq = sn_irq;
      putdma->intrHostDest = sn_irq->irq_xtalkaddr;
      putdma->intrVector = sn_irq->irq_irq;
      if (request_irq(sn_irq->irq_irq,
                  (void *)mbcs_completion_intr_handler, IRQF_SHARED,
                  "MBCS put intr", (void *)soft)) {
            tiocx_irq_free(soft->put_sn_irq);
            free_irq(soft->get_sn_irq->irq_irq, soft);
            tiocx_irq_free(soft->get_sn_irq);
            return -EAGAIN;
      }

      sn_irq = tiocx_irq_alloc(dev->cx_id.nasid, TIOCX_CORELET, -1, -1, -1);
      if (sn_irq == NULL) {
            free_irq(soft->put_sn_irq->irq_irq, soft);
            tiocx_irq_free(soft->put_sn_irq);
            free_irq(soft->get_sn_irq->irq_irq, soft);
            tiocx_irq_free(soft->get_sn_irq);
            return -EAGAIN;
      }
      soft->algo_sn_irq = sn_irq;
      algo->intrHostDest = sn_irq->irq_xtalkaddr;
      algo->intrVector = sn_irq->irq_irq;
      if (request_irq(sn_irq->irq_irq,
                  (void *)mbcs_completion_intr_handler, IRQF_SHARED,
                  "MBCS algo intr", (void *)soft)) {
            tiocx_irq_free(soft->algo_sn_irq);
            free_irq(soft->put_sn_irq->irq_irq, soft);
            tiocx_irq_free(soft->put_sn_irq);
            free_irq(soft->get_sn_irq->irq_irq, soft);
            tiocx_irq_free(soft->get_sn_irq);
            return -EAGAIN;
      }

      return 0;
}

/**
 * mbcs_intr_dealloc - Remove interrupts.
 * @dev: device pointer
 *
 */
static void mbcs_intr_dealloc(struct cx_dev *dev)
{
      struct mbcs_soft *soft;

      soft = dev->soft;

      free_irq(soft->get_sn_irq->irq_irq, soft);
      tiocx_irq_free(soft->get_sn_irq);
      free_irq(soft->put_sn_irq->irq_irq, soft);
      tiocx_irq_free(soft->put_sn_irq);
      free_irq(soft->algo_sn_irq->irq_irq, soft);
      tiocx_irq_free(soft->algo_sn_irq);
}

static inline int mbcs_hw_init(struct mbcs_soft *soft)
{
      void *mmr_base = soft->mmr_base;
      union cm_control cm_control;
      union cm_req_timeout cm_req_timeout;
      uint64_t err_stat;

      cm_req_timeout.cm_req_timeout_reg =
          MBCS_MMR_GET(mmr_base, MBCS_CM_REQ_TOUT);

      cm_req_timeout.time_out = MBCS_CM_CONTROL_REQ_TOUT_MASK;
      MBCS_MMR_SET(mmr_base, MBCS_CM_REQ_TOUT,
                 cm_req_timeout.cm_req_timeout_reg);

      mbcs_gscr_pioaddr_set(soft);
      mbcs_debug_pioaddr_set(soft);

      /* clear errors */
      err_stat = MBCS_MMR_GET(mmr_base, MBCS_CM_ERR_STAT);
      MBCS_MMR_SET(mmr_base, MBCS_CM_CLR_ERR_STAT, err_stat);
      MBCS_MMR_ZERO(mmr_base, MBCS_CM_ERROR_DETAIL1);

      /* enable interrupts */
      /* turn off 2^23 (INT_EN_PIO_REQ_ADDR_INV) */
      MBCS_MMR_SET(mmr_base, MBCS_CM_ERR_INT_EN, 0x3ffffff7e00ffUL);

      /* arm status regs and clear engines */
      cm_control.cm_control_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
      cm_control.rearm_stat_regs = 1;
      cm_control.alg_clr = 1;
      cm_control.wr_dma_clr = 1;
      cm_control.rd_dma_clr = 1;

      MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);

      return 0;
}

static ssize_t show_algo(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct cx_dev *cx_dev = to_cx_dev(dev);
      struct mbcs_soft *soft = cx_dev->soft;
      uint64_t debug0;

      /*
       * By convention, the first debug register contains the
       * algorithm number and revision.
       */
      debug0 = *(uint64_t *) soft->debug_addr;

      return sprintf(buf, "0x%lx 0x%lx\n",
                   (debug0 >> 32), (debug0 & 0xffffffff));
}

static ssize_t store_algo(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      int n;
      struct cx_dev *cx_dev = to_cx_dev(dev);
      struct mbcs_soft *soft = cx_dev->soft;

      if (count <= 0)
            return 0;

      n = simple_strtoul(buf, NULL, 0);

      if (n == 1) {
            mbcs_algo_start(soft);
            if (wait_event_interruptible(soft->algo_queue,
                              atomic_read(&soft->algo_done)))
                  return -ERESTARTSYS;
      }

      return count;
}

DEVICE_ATTR(algo, 0644, show_algo, store_algo);

/**
 * mbcs_probe - Initialize for device
 * @dev: device pointer
 * @device_id: id table pointer
 *
 */
static int mbcs_probe(struct cx_dev *dev, const struct cx_device_id *id)
{
      struct mbcs_soft *soft;

      dev->soft = NULL;

      soft = kzalloc(sizeof(struct mbcs_soft), GFP_KERNEL);
      if (soft == NULL)
            return -ENOMEM;

      soft->nasid = dev->cx_id.nasid;
      list_add(&soft->list, &soft_list);
      soft->mmr_base = (void *)tiocx_swin_base(dev->cx_id.nasid);
      dev->soft = soft;
      soft->cxdev = dev;

      init_waitqueue_head(&soft->dmawrite_queue);
      init_waitqueue_head(&soft->dmaread_queue);
      init_waitqueue_head(&soft->algo_queue);

      init_MUTEX(&soft->dmawritelock);
      init_MUTEX(&soft->dmareadlock);
      init_MUTEX(&soft->algolock);

      mbcs_getdma_init(&soft->getdma);
      mbcs_putdma_init(&soft->putdma);
      mbcs_algo_init(&soft->algo);

      mbcs_hw_init(soft);

      /* Allocate interrupts */
      mbcs_intr_alloc(dev);

      device_create_file(&dev->dev, &dev_attr_algo);

      return 0;
}

static int mbcs_remove(struct cx_dev *dev)
{
      if (dev->soft) {
            mbcs_intr_dealloc(dev);
            kfree(dev->soft);
      }

      device_remove_file(&dev->dev, &dev_attr_algo);

      return 0;
}

static const struct cx_device_id __devinitdata mbcs_id_table[] = {
      {
       .part_num = MBCS_PART_NUM,
       .mfg_num = MBCS_MFG_NUM,
       },
      {
       .part_num = MBCS_PART_NUM_ALG0,
       .mfg_num = MBCS_MFG_NUM,
       },
      {0, 0}
};

MODULE_DEVICE_TABLE(cx, mbcs_id_table);

static struct cx_drv mbcs_driver = {
      .name = DEVICE_NAME,
      .id_table = mbcs_id_table,
      .probe = mbcs_probe,
      .remove = mbcs_remove,
};

static void __exit mbcs_exit(void)
{
      unregister_chrdev(mbcs_major, DEVICE_NAME);
      cx_driver_unregister(&mbcs_driver);
}

static int __init mbcs_init(void)
{
      int rv;

      if (!ia64_platform_is("sn2"))
            return -ENODEV;

      // Put driver into chrdevs[].  Get major number.
      rv = register_chrdev(mbcs_major, DEVICE_NAME, &mbcs_ops);
      if (rv < 0) {
            DBG(KERN_ALERT "mbcs_init: can't get major number. %d\n", rv);
            return rv;
      }
      mbcs_major = rv;

      return cx_driver_register(&mbcs_driver);
}

module_init(mbcs_init);
module_exit(mbcs_exit);

MODULE_AUTHOR("Bruce Losure <blosure@sgi.com>");
MODULE_DESCRIPTION("Driver for MOATB Core Services");
MODULE_LICENSE("GPL");

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