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/*

 *  linux/drivers/acorn/scsi/scsi.h

 *

 *  Copyright (C) 2002 Russell King

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 *  Commonly used scsi driver functions.

 */

#define BELT_AND_BRACES

/*

 * The scatter-gather list handling.  This contains all

 * the yucky stuff that needs to be fixed properly.

 */

static inline int copy_SCp_to_sg(struct scatterlist *sg, Scsi_Pointer *SCp, int max)

{

        int bufs = SCp->buffers_residual;

        BUG_ON(bufs + 1 > max);

        sg->address = SCp->ptr;

        sg->length = SCp->this_residual;

        if (bufs)

                memcpy(sg + 1, SCp->buffer + 1,

                       sizeof(struct scatterlist) * bufs);

        return bufs + 1;

}

static inline int next_SCp(Scsi_Pointer *SCp)

{

        int ret = SCp->buffers_residual;

        if (ret) {

                SCp->buffer++;

                SCp->buffers_residual--;

                SCp->ptr = (unsigned char *)SCp->buffer->address;

                SCp->this_residual = SCp->buffer->length;

        } else {

                SCp->ptr = NULL;

                SCp->this_residual = 0;

        }

        return ret;

}

static inline unsigned char get_next_SCp_byte(Scsi_Pointer *SCp)

{

        char c = *SCp->ptr;

        SCp->ptr += 1;

        SCp->this_residual -= 1;

        return c;

}

static inline void put_next_SCp_byte(Scsi_Pointer *SCp, unsigned char c)

{

        *SCp->ptr = c;

        SCp->ptr += 1;

        SCp->this_residual -= 1;

}

static inline void init_SCp(Scsi_Cmnd *SCpnt)

{

        memset(&SCpnt->SCp, 0, sizeof(struct scsi_pointer));

        if (SCpnt->use_sg) {

                unsigned long len = 0;

                int buf;

                SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->buffer;

                SCpnt->SCp.buffers_residual = SCpnt->use_sg - 1;

                SCpnt->SCp.ptr = (char *) SCpnt->SCp.buffer->address;

                SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;

#ifdef BELT_AND_BRACES

                /*

                 * Calculate correct buffer length.  Some commands

                 * come in with the wrong request_bufflen.

                 */

                for (buf = 0; buf <= SCpnt->SCp.buffers_residual; buf++)

                        len += SCpnt->SCp.buffer[buf].length;

                if (SCpnt->request_bufflen != len)

                        printk(KERN_WARNING "scsi%d.%c: bad request buffer "

                               "length %d, should be %ld\n", SCpnt->host->host_no,

                               '0' + SCpnt->target, SCpnt->request_bufflen, len);

                SCpnt->request_bufflen = len;

#endif

        } else {

                SCpnt->SCp.ptr = (unsigned char *)SCpnt->request_buffer;

                SCpnt->SCp.this_residual = SCpnt->request_bufflen;

        }

        /*

         * If the upper SCSI layers pass a buffer, but zero length,

         * we aren't interested in the buffer pointer.

         */

        if (SCpnt->SCp.this_residual == 0 && SCpnt->SCp.ptr) {

#if 0 //def BELT_AND_BRACES

                printk(KERN_WARNING "scsi%d.%c: zero length buffer passed for "

                       "command ", SCpnt->host->host_no, '0' + SCpnt->target);

                print_command(SCpnt->cmnd);

#endif

                SCpnt->SCp.ptr = NULL;

        }

}

static inline struct Scsi_Host *scsi_host_hn_get(int host_no)

{

        struct Scsi_Host *host = scsi_hostlist;

        while (host) {

                if (host->host_no == host_no)

                        break;

                host = host->next;

        }

        return host;

}