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/* $OpenBSD: ctu.c,v 1.4 2003/08/15 23:16:30 deraadt Exp $ */
/* $NetBSD: ctu.c,v 1.3 2000/05/20 13:30:03 ragge Exp $ */
/*
* Copyright (c) 1996 Ludd, University of Lule}, Sweden.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed at Ludd, University of
* Lule}, Sweden and its contributors.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Standalone device driver for 11/750 Console TU58.
* It can only handle reads, and doesn't calculate checksum.
*/
#include <sys/param.h>
#include <lib/libsa/stand.h>
#include <machine/mtpr.h>
#include <machine/rsp.h>
#include "vaxstand.h"
static short ctu_cksum(unsigned short *, int);
enum tu_state {
SC_INIT,
SC_READY,
SC_SEND_CMD,
SC_GET_RESP,
};
volatile struct tu_softc {
enum tu_state sc_state;
char sc_rsp[15]; /* Should be struct rsb; but don't work */
u_char *sc_xfptr; /* Current char to xfer */
int sc_nbytes; /* Number of bytes to xfer */
int sc_xbytes; /* Number of xfer'd bytes */
int sc_bbytes; /* Number of xfer'd bytes this block */
} tu_sc;
void ctutintr(void);
void cturintr(void);
int
ctuopen(struct open_file *f, int adapt, int ctlr, int unit, int part)
{
tu_sc.sc_state = SC_INIT;
mtpr(RSP_TYP_INIT, PR_CSTD);
cturintr();
tu_sc.sc_state = SC_READY;
return 0;
}
int
ctustrategy(void *f, int func, daddr_t dblk, size_t size, void *buf, size_t *rsize)
{
struct rsp *rsp = (struct rsp *)tu_sc.sc_rsp;
tu_sc.sc_xfptr = buf;
tu_sc.sc_nbytes = size;
tu_sc.sc_xbytes = tu_sc.sc_bbytes = 0;
rsp->rsp_typ = RSP_TYP_COMMAND;
rsp->rsp_sz = 012;
rsp->rsp_op = RSP_OP_READ;
rsp->rsp_mod = 0;
rsp->rsp_drv = 0;
rsp->rsp_sw = rsp->rsp_xx1 = rsp->rsp_xx2 = 0;
rsp->rsp_cnt = tu_sc.sc_nbytes;
rsp->rsp_blk = dblk;
rsp->rsp_sum = ctu_cksum((u_short *)rsp, 6);
tu_sc.sc_state = SC_SEND_CMD;
while (tu_sc.sc_state != SC_GET_RESP)
ctutintr();
while (tu_sc.sc_state != SC_READY)
cturintr();
*rsize = size;
return 0;
}
void
cturintr(void)
{
int status;
while ((mfpr(PR_CSRS) & 0x80) == 0)
;
status = mfpr(PR_CSRD);
switch (tu_sc.sc_state) {
case SC_INIT:
break;
case SC_GET_RESP:
if (tu_sc.sc_xbytes == tu_sc.sc_nbytes) {
tu_sc.sc_bbytes++;
if (tu_sc.sc_bbytes == 146)
tu_sc.sc_state = SC_READY;
break;
}
tu_sc.sc_bbytes++;
if (tu_sc.sc_bbytes < 3) /* Data header */
break;
if (tu_sc.sc_bbytes == 132) { /* Finished */
tu_sc.sc_bbytes = 0;
break;
}
if (tu_sc.sc_bbytes == 131) /* First checksum */
break;
tu_sc.sc_xfptr[tu_sc.sc_xbytes++] = status;
break;
case SC_READY:
case SC_SEND_CMD:
break;
}
}
void
ctutintr(void)
{
int c;
while ((mfpr(PR_CSTS) & 0x80) == 0)
;
c = tu_sc.sc_rsp[tu_sc.sc_xbytes++] & 0xff;
mtpr(c, PR_CSTD);
if (tu_sc.sc_xbytes > 13) {
tu_sc.sc_state = SC_GET_RESP;
tu_sc.sc_xbytes = 0;
}
}
short
ctu_cksum(unsigned short *buf, int words)
{
int i, cksum;
for (i = cksum = 0; i < words; i++)
cksum += buf[i];
hej: if (cksum > 65535) {
cksum = (cksum & 65535) + (cksum >> 16);
goto hej;
}
return cksum;
}
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