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NetBSD/sys/arch/atari/dev/atari5380.c
leo 05ebc10205 Disable SCSI interrupts while polling for the transfer to finish. This 
fixes spurious panics while booting my Hades. This bug could also occur
on a TT030.
1998-10-06 09:29:44 +00:00

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/* $NetBSD: atari5380.c,v 1.29 1998/10/06 09:29:44 leo Exp $ */
/*
* Copyright (c) 1995 Leo Weppelman.
* 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 by Leo Weppelman.
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsi_message.h>
#include <dev/scsipi/scsiconf.h>
#include <m68k/asm_single.h>
#include <m68k/cpu.h>
#include <m68k/cacheops.h>
#include <atari/atari/stalloc.h>
/*
* Include the driver definitions
*/
#include <atari/dev/ncr5380reg.h>
#include <machine/stdarg.h>
#include <machine/iomap.h>
#include <machine/mfp.h>
#include <atari/atari/intr.h>
#if defined(FALCON_SCSI)
#include <machine/dma.h>
#endif
/*
* Set the various driver options
*/
#define NREQ 18 /* Size of issue queue */
#define AUTO_SENSE 1 /* Automatically issue a request-sense */
#define DRNAME ncrscsi /* used in various prints */
#undef DBG_SEL /* Show the selection process */
#undef DBG_REQ /* Show enqueued/ready requests */
#undef DBG_ERR_RET /* Show requests with != 0 return code */
#undef DBG_NOWRITE /* Do not allow writes to the targets */
#undef DBG_PIO /* Show the polled-I/O process */
#undef DBG_INF /* Show information transfer process */
#define DBG_NOSTATIC /* No static functions, all in DDB trace*/
#define DBG_PID 15 /* Keep track of driver */
#define REAL_DMA /* Use DMA if sensible */
#if defined(FALCON_SCSI)
#define REAL_DMA_POLL 1 /* 1: Poll for end of DMA-transfer */
#else
#define REAL_DMA_POLL 0 /* 1: Poll for end of DMA-transfer */
#endif
#undef USE_PDMA /* Use special pdma-transfer function */
#define MIN_PHYS 65536 /*BARF!!!!*/
/*
* Include more driver definitions
*/
#include <atari/dev/ncr5380var.h>
/*
* The atari specific driver options
*/
#undef NO_TTRAM_DMA /* Do not use DMA to TT-ram. This */
/* fails on older atari's */
#define ENABLE_NCR5380(sc) cur_softc = sc;
static u_char *alloc_bounceb __P((u_long));
static void free_bounceb __P((u_char *));
static int machine_match __P((struct device *, void *, void *,
struct cfdriver *));
void scsi_ctrl __P((int));
void scsi_dma __P((int));
/*
* Functions that do nothing on the atari
*/
#define pdma_ready() 0
#if defined(TT_SCSI)
void ncr5380_drq_intr __P((int));
/*
* Define all the things we need of the DMA-controller
*/
#define SCSI_DMA ((struct scsi_dma *)AD_SCSI_DMA)
#define SCSI_5380 ((struct scsi_5380 *)AD_NCR5380)
struct scsi_dma {
volatile u_char s_dma_ptr[8]; /* use only the odd bytes */
volatile u_char s_dma_cnt[8]; /* use only the odd bytes */
volatile u_char s_dma_res[4]; /* data residue register */
volatile u_char s_dma_gap; /* not used */
volatile u_char s_dma_ctrl; /* control register */
volatile u_char s_dma_gap2; /* not used */
volatile u_char s_hdma_ctrl; /* Hades control register */
};
#define set_scsi_dma(addr, val) (void)( \
{ \
u_char *address = (u_char*)addr+1; \
u_long nval = (u_long)val; \
__asm("movepl %0, %1@(0)": :"d" (nval), "a" (address)); \
})
#define get_scsi_dma(addr, res) ( \
{ \
u_char *address = (u_char*)addr+1; \
u_long nval; \
__asm("movepl %1@(0), %0": "=d" (nval) : "a" (address)); \
res = (u_long)nval; \
})
/*
* Defines for TT-DMA control register
*/
#define SD_BUSERR 0x80 /* 1 = transfer caused bus error*/
#define SD_ZERO 0x40 /* 1 = byte counter is zero */
#define SD_ENABLE 0x02 /* 1 = Enable DMA */
#define SD_OUT 0x01 /* Direction: memory to SCSI */
#define SD_IN 0x00 /* Direction: SCSI to memory */
/*
* Defines for Hades-DMA control register
*/
#define SDH_BUSERR 0x02 /* 1 = Bus error */
#define SDH_EOP 0x01 /* 1 = Signal EOP on 5380 */
#define SDH_ZERO 0x40 /* 1 = Byte counter is zero */
/*
* Define the 5380 register set
*/
struct scsi_5380 {
volatile u_char scsi_5380[16]; /* use only the odd bytes */
};
#endif /* TT_SCSI */
/**********************************************
* Variables present for both TT and Falcon. *
**********************************************/
/*
* Softc of currently active controller (a bit of fake; we only have one)
*/
static struct ncr_softc *cur_softc;
#if defined(TT_SCSI) && !defined(FALCON_SCSI)
/*
* We can be more efficient for some functions when only TT_SCSI is selected
*/
#define GET_5380_REG(rnum) SCSI_5380->scsi_5380[(rnum << 1) | 1]
#define SET_5380_REG(rnum,val) (SCSI_5380->scsi_5380[(rnum << 1) | 1] = val)
#define scsi_mach_init(sc) scsi_tt_init(sc)
#define scsi_ienable() scsi_tt_ienable()
#define scsi_idisable() scsi_tt_idisable()
#define scsi_clr_ipend() scsi_tt_clr_ipend()
#define scsi_ipending() (GET_5380_REG(NCR5380_DMSTAT) & SC_IRQ_SET)
#define scsi_dma_setup(r,p,m) scsi_tt_dmasetup(r, p, m)
#define wrong_dma_range(r,d) tt_wrong_dma_range(r, d)
#define poll_edma(reqp) tt_poll_edma(reqp)
#define get_dma_result(r, b) tt_get_dma_result(r, b)
#define can_access_5380() 1
#define emulated_dma() ((machineid & ATARI_HADES) ? 1 : 0)
#define fair_to_keep_dma() 1
#define claimed_dma() 1
#define reconsider_dma()
#endif /* defined(TT_SCSI) && !defined(FALCON_SCSI) */
#if defined(TT_SCSI)
/*
* Prototype functions defined below
*/
#ifdef NO_TTRAM_DMA
static int tt_wrong_dma_range __P((SC_REQ *, struct dma_chain *));
#endif
static void scsi_tt_init __P((struct ncr_softc *));
static u_char get_tt_5380_reg __P((u_short));
static void set_tt_5380_reg __P((u_short, u_short));
static void scsi_tt_dmasetup __P((SC_REQ *, u_int, u_char));
static int tt_poll_edma __P((SC_REQ *));
static u_char *ptov __P((SC_REQ *, u_long*));
static int tt_get_dma_result __P((SC_REQ *, u_long *));
void scsi_tt_ienable __P((void));
void scsi_tt_idisable __P((void));
void scsi_tt_clr_ipend __P((void));
/*
* Define these too, so we can use them locally...
*/
#define GET_TT_REG(rnum) SCSI_5380->scsi_5380[(rnum << 1) | 1]
#define SET_TT_REG(rnum,val) (SCSI_5380->scsi_5380[(rnum << 1) | 1] = val)
#ifdef NO_TTRAM_DMA
static int
tt_wrong_dma_range(reqp, dm)
SC_REQ *reqp;
struct dma_chain *dm;
{
if (dm->dm_addr & 0xff000000) {
reqp->dr_flag |= DRIVER_BOUNCING;
return(1);
}
return(0);
}
#else
#define tt_wrong_dma_range(reqp, dm) 0
#endif
static void
scsi_tt_init(struct ncr_softc *sc)
{
/*
* Enable SCSI-related interrupts
*/
MFP2->mf_aer |= 0x80; /* SCSI IRQ goes HIGH!!!!! */
if (machineid & ATARI_TT) {
/* SCSI-dma interrupts */
MFP2->mf_ierb |= IB_SCDM;
MFP2->mf_iprb &= ~IB_SCDM;
MFP2->mf_imrb |= IB_SCDM;
}
else if (machineid & ATARI_HADES) {
SCSI_DMA->s_hdma_ctrl = 0;
if (intr_establish(2, AUTO_VEC, 0,
(hw_ifun_t)ncr5380_drq_intr,
NULL) == NULL)
panic("scsi_tt_init: Can't establish drq-interrupt");
}
else panic("scsi_tt_init: should not come here");
MFP2->mf_iera |= IA_SCSI; /* SCSI-5380 interrupts */
MFP2->mf_ipra &= ~IA_SCSI;
MFP2->mf_imra |= IA_SCSI;
/*
* LWP: DMA transfers to TT-ram causes data to be garbeled
* without notice on some revisons of the TT-mainboard.
* When program's generate misterious Segmentations faults,
* try turning on NO_TTRAM_DMA.
*/
#ifdef NO_TTRAM_DMA
printf(": DMA to TT-RAM is disabled!");
#endif
}
static u_char
get_tt_5380_reg(u_short rnum)
{
return(SCSI_5380->scsi_5380[(rnum << 1) | 1]);
}
static void
set_tt_5380_reg(u_short rnum, u_short val)
{
SCSI_5380->scsi_5380[(rnum << 1) | 1] = val;
}
extern __inline__ void
scsi_tt_ienable(void)
{
if (machineid & ATARI_TT)
single_inst_bset_b(MFP2->mf_imrb, IB_SCDM);
single_inst_bset_b(MFP2->mf_imra, IA_SCSI);
}
extern __inline__ void
scsi_tt_idisable(void)
{
if (machineid & ATARI_TT)
single_inst_bclr_b(MFP2->mf_imrb, IB_SCDM);
single_inst_bclr_b(MFP2->mf_imra, IA_SCSI);
}
extern __inline__ void
scsi_tt_clr_ipend(void)
{
int tmp;
SCSI_DMA->s_dma_ctrl = 0;
tmp = GET_TT_REG(NCR5380_IRCV);
if (machineid & ATARI_TT)
single_inst_bclr_b(MFP2->mf_iprb, IB_SCDM);
single_inst_bclr_b(MFP2->mf_ipra, IA_SCSI);
/*
* Remove interrupts already scheduled.
*/
rem_sicallback((si_farg)ncr_ctrl_intr);
rem_sicallback((si_farg)ncr_dma_intr);
}
static void
scsi_tt_dmasetup(SC_REQ *reqp, u_int phase, u_char mode)
{
if (PH_IN(phase)) {
SCSI_DMA->s_dma_ctrl = SD_IN;
if (machineid & ATARI_HADES)
SCSI_DMA->s_hdma_ctrl &= ~(SDH_BUSERR|SDH_EOP);
set_scsi_dma(&(SCSI_DMA->s_dma_ptr), reqp->dm_cur->dm_addr);
set_scsi_dma(&(SCSI_DMA->s_dma_cnt), reqp->dm_cur->dm_count);
SET_TT_REG(NCR5380_ICOM, 0);
SET_TT_REG(NCR5380_MODE, mode);
SCSI_DMA->s_dma_ctrl = SD_ENABLE;
SET_TT_REG(NCR5380_IRCV, 0);
}
else {
SCSI_DMA->s_dma_ctrl = SD_OUT;
if (machineid & ATARI_HADES)
SCSI_DMA->s_hdma_ctrl &= ~(SDH_BUSERR|SDH_EOP);
set_scsi_dma(&(SCSI_DMA->s_dma_ptr), reqp->dm_cur->dm_addr);
set_scsi_dma(&(SCSI_DMA->s_dma_cnt), reqp->dm_cur->dm_count);
SET_TT_REG(NCR5380_MODE, mode);
SET_TT_REG(NCR5380_ICOM, SC_ADTB);
SET_TT_REG(NCR5380_DMSTAT, 0);
SCSI_DMA->s_dma_ctrl = SD_ENABLE|SD_OUT;
}
}
static int
tt_poll_edma(SC_REQ *reqp)
{
u_char dmstat, dmastat;
int timeout = 9000; /* XXX */
/*
* We wait here until the DMA has finished. This can be
* achieved by checking the following conditions:
* - 5380:
* - End of DMA flag is set
* - We lost BSY (error!!)
* - A phase mismatch has occured (partial transfer)
* - DMA-controller:
* - A bus error occurred (Kernel error!!)
* - All bytes are transferred
* If one of the terminating conditions was met, we call
* 'dma_ready' to check errors and perform the bookkeeping.
*/
scsi_tt_idisable();
for (;;) {
delay(20);
if (--timeout <= 0) {
ncr_tprint(reqp, "timeout on polled transfer\n");
reqp->xs->error = XS_TIMEOUT;
scsi_tt_ienable();
return(0);
}
dmstat = GET_TT_REG(NCR5380_DMSTAT);
if ((machineid & ATARI_HADES) && (dmstat & SC_DMA_REQ)) {
ncr5380_drq_intr(1);
dmstat = GET_TT_REG(NCR5380_DMSTAT);
}
dmastat = SCSI_DMA->s_dma_ctrl;
if (dmstat & (SC_END_DMA|SC_BSY_ERR|SC_IRQ_SET))
break;
if (!(dmstat & SC_PHS_MTCH))
break;
if (dmastat & (SD_BUSERR|SD_ZERO))
break;
}
scsi_tt_ienable();
return(1);
}
/*
* Convert physical DMA address to a virtual address.
*/
static u_char *
ptov(SC_REQ *reqp, u_long *phaddr)
{
struct dma_chain *dm;
u_char *vaddr;
dm = reqp->dm_chain;
vaddr = reqp->xdata_ptr;
for(; dm < reqp->dm_cur; dm++)
vaddr += dm->dm_count;
vaddr += (u_long)phaddr - dm->dm_addr;
return(vaddr);
}
static int
tt_get_dma_result(SC_REQ *reqp, u_long *bytes_left)
{
int dmastat, dmstat;
u_char *byte_p;
u_long leftover;
dmastat = SCSI_DMA->s_dma_ctrl;
dmstat = GET_TT_REG(NCR5380_DMSTAT);
get_scsi_dma(SCSI_DMA->s_dma_cnt, leftover);
get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)byte_p);
if (dmastat & SD_BUSERR) {
/*
* The DMA-controller seems to access 8 bytes beyond
* it's limits on output. Therefore check also the byte
* count. If it's zero, ignore the bus error.
*/
if (leftover != 0) {
ncr_tprint(reqp,
"SCSI-DMA buserror - accessing 0x%x\n", byte_p);
reqp->xs->error = XS_DRIVER_STUFFUP;
}
}
/*
* We handle the following special condition below:
* -- The device disconnects in the middle of a write operation --
* In this case, the 5380 has already pre-fetched the next byte from
* the DMA-controller before the phase mismatch occurs. Therefore,
* leftover is 1 too low.
* This does not always happen! Therefore, we only do this when
* leftover is odd. This assumes that DMA transfers are _even_! This
* is normally the case on disks and types but might not always be.
* XXX: Check if ACK is consistently high on these occasions LWP
*/
if ((leftover & 1) && !(dmstat & SC_PHS_MTCH) && PH_OUT(reqp->phase))
leftover++;
/*
* Check if there are some 'restbytes' left in the DMA-controller.
*/
if ((machineid & ATARI_TT) && ((u_long)byte_p & 3)
&& PH_IN(reqp->phase)) {
u_char *p, *q;
p = ptov(reqp, (u_long *)((u_long)byte_p & ~3));
q = (u_char*)&(SCSI_DMA->s_dma_res);
switch ((u_long)byte_p & 3) {
case 3: *p++ = *q++;
case 2: *p++ = *q++;
case 1: *p++ = *q++;
}
}
*bytes_left = leftover;
return ((dmastat & (SD_BUSERR|SD_ZERO)) ? 1 : 0);
}
static u_char *dma_ptr;
void
ncr5380_drq_intr(poll)
int poll;
{
extern int *nofault;
label_t faultbuf;
int write;
u_long count;
u_char *data_p = (u_char*)(stio_addr+0x741);
/*
* Block SCSI interrupts while emulating DMA. They come
* at a higher priority.
*/
single_inst_bclr_b(MFP2->mf_imra, IA_SCSI);
/*
* Setup for a possible bus error caused by SCSI controller
* switching out of DATA-IN/OUT before we're done with the
* current transfer.
*/
nofault = (int *) &faultbuf;
if (setjmp((label_t *) nofault)) {
u_char *ptr;
u_long cnt, tmp;
PID("drq berr");
nofault = (int *) 0;
/*
* Determine number of bytes transferred
*/
get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)ptr);
cnt = dma_ptr - ptr;
if (cnt != 0) {
/*
* Update the dma pointer/count fields
*/
set_scsi_dma(SCSI_DMA->s_dma_ptr, dma_ptr);
get_scsi_dma(SCSI_DMA->s_dma_cnt, tmp);
set_scsi_dma(SCSI_DMA->s_dma_cnt, tmp - cnt);
if (tmp > cnt) {
/*
* Still more to transfer
*/
if (!poll)
single_inst_bset_b(MFP2->mf_imra, IA_SCSI);
return;
}
/*
* Signal EOP to 5380
*/
SCSI_DMA->s_hdma_ctrl |= SDH_EOP;
}
else {
nofault = (int *) &faultbuf;
/*
* Try to figure out if the byte-count was
* zero because there was no (more) data or
* because the dma_ptr is bogus.
*/
if (setjmp((label_t *) nofault)) {
/*
* Set the bus-error bit
*/
SCSI_DMA->s_hdma_ctrl |= SDH_BUSERR;
}
__asm __volatile ("tstb %0@(0)": : "a" (dma_ptr));
nofault = (int *)0;
}
/*
* Schedule an interrupt
*/
if (!poll && (SCSI_DMA->s_dma_ctrl & SD_ENABLE))
add_sicallback((si_farg)ncr_dma_intr, (void *)cur_softc, 0);
/*
* Clear DMA-mode
*/
SCSI_DMA->s_dma_ctrl &= ~SD_ENABLE;
if (!poll)
single_inst_bset_b(MFP2->mf_imra, IA_SCSI);
return;
}
write = (SCSI_DMA->s_dma_ctrl & SD_OUT) ? 1 : 0;
#if DBG_PID
if (write) {
PID("drq (in)");
} else {
PID("drq (out)");
}
#endif
get_scsi_dma(SCSI_DMA->s_dma_cnt, count);
get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)dma_ptr);
/*
* Keep pushing bytes until we're done or a bus-error
* signals that the SCSI controller is not ready.
* NOTE: I tried some optimalizations in these loops,
* but they had no effect on transfer speed.
*/
if (write) {
while(count--) {
*data_p = *dma_ptr++;
}
}
else {
while(count--) {
*dma_ptr++ = *data_p;
}
}
/*
* OK. No bus error occurred above. Clear the nofault flag
* so we no longer short-circuit bus errors.
*/
nofault = (int *) 0;
/*
* Schedule an interrupt
*/
if (!poll && (SCSI_DMA->s_dma_ctrl & SD_ENABLE))
add_sicallback((si_farg)ncr_dma_intr, (void *)cur_softc, 0);
/*
* Clear DMA-mode
*/
SCSI_DMA->s_dma_ctrl &= ~SD_ENABLE;
/*
* Update the DMA 'registers' to reflect that all bytes
* have been transfered and tell this to the 5380 too.
*/
set_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)dma_ptr);
set_scsi_dma(SCSI_DMA->s_dma_cnt, 0);
SCSI_DMA->s_hdma_ctrl |= SDH_EOP;
PID("end drq");
if (!poll)
single_inst_bset_b(MFP2->mf_imra, IA_SCSI);
return;
}
#endif /* defined(TT_SCSI) */
#if defined(FALCON_SCSI) && !defined(TT_SCSI)
#define GET_5380_REG(rnum) get_falcon_5380_reg(rnum)
#define SET_5380_REG(rnum,val) set_falcon_5380_reg(rnum, val)
#define scsi_mach_init(sc) scsi_falcon_init(sc)
#define scsi_ienable() scsi_falcon_ienable()
#define scsi_idisable() scsi_falcon_idisable()
#define scsi_clr_ipend() scsi_falcon_clr_ipend()
#define scsi_ipending() scsi_falcon_ipending()
#define scsi_dma_setup(r,p,m) scsi_falcon_dmasetup(r, p, m)
#define wrong_dma_range(r,d) falcon_wrong_dma_range(r, d)
#define poll_edma(reqp) falcon_poll_edma(reqp)
#define get_dma_result(r, b) falcon_get_dma_result(r, b)
#define can_access_5380() falcon_can_access_5380()
#define emulated_dma() 0
#define fair_to_keep_dma() (!st_dmawanted())
#define claimed_dma() falcon_claimed_dma()
#define reconsider_dma() falcon_reconsider_dma()
#endif /* defined(FALCON_SCSI) && !defined(TT_SCSI) */
#if defined(FALCON_SCSI)
/*
* Prototype functions defined below
*/
static void scsi_falcon_init __P((struct ncr_softc *));
static u_char get_falcon_5380_reg __P((u_short));
static void set_falcon_5380_reg __P((u_short, u_short));
static int falcon_wrong_dma_range __P((SC_REQ *, struct dma_chain *));
static void fal1_dma __P((u_int, u_int, SC_REQ *));
static void scsi_falcon_dmasetup __P((SC_REQ *, u_int, u_char));
static int falcon_poll_edma __P((SC_REQ *));
static int falcon_get_dma_result __P((SC_REQ *, u_long *));
int falcon_can_access_5380 __P((void));
void scsi_falcon_clr_ipend __P((void));
void scsi_falcon_idisable __P((void));
void scsi_falcon_ienable __P((void));
int scsi_falcon_ipending __P((void));
int falcon_claimed_dma __P((void));
void falcon_reconsider_dma __P((void));
static void
scsi_falcon_init(sc)
struct ncr_softc *sc;
{
/*
* Enable disk related interrupts
*/
MFP->mf_ierb |= IB_DINT;
MFP->mf_iprb &= ~IB_DINT;
MFP->mf_imrb |= IB_DINT;
}
static u_char
get_falcon_5380_reg(rnum)
u_short rnum;
{
DMA->dma_mode = DMA_SCSI + rnum;
return(DMA->dma_data);
}
static void
set_falcon_5380_reg(rnum, val)
u_short rnum, val;
{
DMA->dma_mode = DMA_SCSI + rnum;
DMA->dma_data = val;
}
extern __inline__ void
scsi_falcon_ienable()
{
single_inst_bset_b(MFP->mf_imrb, IB_DINT);
}
extern __inline__ void
scsi_falcon_idisable()
{
single_inst_bclr_b(MFP->mf_imrb, IB_DINT);
}
extern __inline__ void
scsi_falcon_clr_ipend()
{
int tmp;
tmp = get_falcon_5380_reg(NCR5380_IRCV);
rem_sicallback((si_farg)ncr_ctrl_intr);
}
extern __inline__ int
scsi_falcon_ipending()
{
if (connected && (connected->dr_flag & DRIVER_IN_DMA)) {
/*
* XXX: When DMA is running, we are only allowed to
* check the 5380 when DMA _might_ be finished.
*/
if (MFP->mf_gpip & IO_DINT)
return (0); /* XXX: Actually: we're not allowed to check */
/* LWP: 28-06, must be a dma interrupt! should the
* ST-DMA unit be taken out of dma mode?????
*/
DMA->dma_mode = 0x90;
}
return(get_falcon_5380_reg(NCR5380_DMSTAT) & SC_IRQ_SET);
}
static int
falcon_wrong_dma_range(reqp, dm)
SC_REQ *reqp;
struct dma_chain *dm;
{
/*
* Do not allow chains yet! See also comment with
* falcon_poll_edma() !!!
*/
if (((dm - reqp->dm_chain) > 0) || (dm->dm_addr & 0xff000000)) {
reqp->dr_flag |= DRIVER_BOUNCING;
return(1);
}
/*
* Never allow DMA to happen on a Falcon when the transfer
* size is no multiple of 512. This is the transfer unit of the
* ST DMA-controller.
*/
if(dm->dm_count & 511)
return(1);
return(0);
}
static int falcon_lock = 0;
extern __inline__ int
falcon_claimed_dma()
{
if (falcon_lock != DMA_LOCK_GRANT) {
if (falcon_lock == DMA_LOCK_REQ) {
/*
* DMA access is being claimed.
*/
return(0);
}
if (!st_dmagrab((dma_farg)ncr_ctrl_intr, (dma_farg)run_main,
cur_softc, &falcon_lock, 1))
return(0);
}
return(1);
}
extern __inline__ void
falcon_reconsider_dma()
{
if (falcon_lock && (connected == NULL) && (discon_q == NULL)) {
/*
* No need to keep DMA locked by us as we are not currently
* connected and no disconnected jobs are pending.
*/
rem_sicallback((si_farg)ncr_ctrl_intr);
st_dmafree(cur_softc, &falcon_lock);
}
if (!falcon_lock && (issue_q != NULL)) {
/*
* We must (re)claim DMA access as there are jobs
* waiting in the issue queue.
*/
st_dmagrab((dma_farg)ncr_ctrl_intr, (dma_farg)run_main,
cur_softc, &falcon_lock, 0);
}
}
static void
fal1_dma(dir, nsects, reqp)
u_int dir, nsects;
SC_REQ *reqp;
{
dir <<= 8;
st_dmaaddr_set((caddr_t)reqp->dm_cur->dm_addr);
DMA->dma_mode = 0x90 | dir;
DMA->dma_mode = 0x90 | (dir ^ DMA_WRBIT);
DMA->dma_mode = 0x90 | dir;
DMA->dma_data = nsects;
delay(2); /* _really_ needed (Thomas Gerner) */
DMA->dma_mode = 0x10 | dir;
}
static void
scsi_falcon_dmasetup(reqp, phase, mode)
SC_REQ *reqp;
u_int phase;
u_char mode;
{
int nsects = reqp->dm_cur->dm_count / 512; /* XXX */
/*
* XXX: We should probably clear the fifo before putting the
* 5380 into DMA-mode.
*/
if (PH_IN(phase)) {
set_falcon_5380_reg(NCR5380_ICOM, 0);
set_falcon_5380_reg(NCR5380_MODE, mode);
set_falcon_5380_reg(NCR5380_IRCV, 0);
fal1_dma(0, nsects, reqp);
}
else {
set_falcon_5380_reg(NCR5380_MODE, mode);
set_falcon_5380_reg(NCR5380_ICOM, SC_ADTB);
set_falcon_5380_reg(NCR5380_DMSTAT, 0);
fal1_dma(1, nsects, reqp);
}
}
static int
falcon_poll_edma(reqp)
SC_REQ *reqp;
{
int timeout = 9000; /* XXX */
/*
* Because of the Falcon hardware, it is impossible to reach
* the 5380 while doing DMA-transfers. So we have to rely on
* the interrupt line to determine if DMA-has finished. the
* DMA-controller itself will never fire an interrupt. This means
* that 'broken-up' DMA transfers are not (yet) possible on the
* Falcon.
*/
for (;;) {
delay(20);
if (--timeout <= 0) {
ncr_tprint(reqp, "Timeout on polled transfer\n");
reqp->xs->error = XS_TIMEOUT;
return(0);
}
if (!(MFP->mf_gpip & IO_DINT))
break;
}
return(1);
}
static int
falcon_get_dma_result(reqp, bytes_left)
SC_REQ *reqp;
u_long *bytes_left;
{
int rv = 0;
int st_dmastat;
u_long bytes_done;
/*
* Select sector counter register first (See Atari docu.)
*/
DMA->dma_mode = 0x90;
if (!(st_dmastat = DMA->dma_stat) & 0x01) {
/*
* Misc. DMA-error according to Atari...
*/
ncr_tprint(reqp, "Unknow ST-SCSI error near 0x%x\n",
st_dmaaddr_get());
reqp->xs->error = XS_DRIVER_STUFFUP;
rv = 1;
}
/*
* Because we NEVER start DMA on the Falcon when the data size
* is not a multiple of 512 bytes, we can safely round down the
* byte count on writes. We need to because in case of a disconnect,
* the DMA has already prefetched the next couple of bytes.
* On read, these byte counts are an error. They are logged and
* should be handled by the mi-part of the driver.
* NOTE: We formerly did this by using the 'byte-count-zero' bit
* of the DMA controller, but this didn't seem to work???
* [lwp 29/06/96]
*/
bytes_done = st_dmaaddr_get() - reqp->dm_cur->dm_addr;
if (bytes_done & 511) {
if (PH_IN(reqp->phase)) {
ncr_tprint(reqp, "Byte count on read not a multiple "
"of 512 (%ld)\n", bytes_done);
}
bytes_done &= ~511;
}
if ((*bytes_left = reqp->dm_cur->dm_count - bytes_done) == 0)
rv = 1;
return(rv);
}
static int
falcon_can_access_5380()
{
if (connected && (connected->dr_flag & DRIVER_IN_DMA)
&& (MFP->mf_gpip & IO_DINT))
return(0);
return(1);
}
#endif /* defined(FALCON_SCSI) */
#if defined(TT_SCSI) && defined(FALCON_SCSI)
/*
* Define some functions to support _both_ TT and Falcon SCSI
*/
/*
* The prototypes first...
*/
static void scsi_mach_init __P((struct ncr_softc *));
void scsi_ienable __P((void));
void scsi_idisable __P((void));
void scsi_clr_ipend __P((void));
int scsi_ipending __P((void));
void scsi_dma_setup __P((SC_REQ *, u_int, u_char));
int wrong_dma_range __P((SC_REQ *, struct dma_chain *));
int poll_edma __P((SC_REQ *));
int get_dma_result __P((SC_REQ *, u_long *));
int can_access_5380 __P((void));
/*
* Register access will be done through the following 2 function pointers.
*/
static u_char (*get_5380_reg) __P((u_short));
static void (*set_5380_reg) __P((u_short, u_short));
#define GET_5380_REG (*get_5380_reg)
#define SET_5380_REG (*set_5380_reg)
static void
scsi_mach_init(sc)
struct ncr_softc *sc;
{
if (machineid & ATARI_FALCON) {
get_5380_reg = get_falcon_5380_reg;
set_5380_reg = set_falcon_5380_reg;
scsi_falcon_init(sc);
}
else {
get_5380_reg = get_tt_5380_reg;
set_5380_reg = set_tt_5380_reg;
scsi_tt_init(sc);
}
}
extern __inline__ void
scsi_ienable()
{
if (machineid & ATARI_FALCON)
scsi_falcon_ienable();
else scsi_tt_ienable();
}
extern __inline__ void
scsi_idisable()
{
if (machineid & ATARI_FALCON)
scsi_falcon_idisable();
else scsi_tt_idisable();
}
extern __inline__ void
scsi_clr_ipend()
{
if (machineid & ATARI_FALCON)
scsi_falcon_clr_ipend();
else scsi_tt_clr_ipend();
}
extern __inline__ int
scsi_ipending()
{
if (machineid & ATARI_FALCON)
return(scsi_falcon_ipending());
else return (GET_TT_REG(NCR5380_DMSTAT) & SC_IRQ_SET);
}
extern __inline__ void
scsi_dma_setup(reqp, phase, mbase)
SC_REQ *reqp;
u_int phase;
u_char mbase;
{
if (machineid & ATARI_FALCON)
scsi_falcon_dmasetup(reqp, phase, mbase);
else scsi_tt_dmasetup(reqp, phase, mbase);
}
extern __inline__ int
wrong_dma_range(reqp, dm)
SC_REQ *reqp;
struct dma_chain *dm;
{
if (machineid & ATARI_FALCON)
return(falcon_wrong_dma_range(reqp, dm));
else return(tt_wrong_dma_range(reqp, dm));
}
extern __inline__ int
poll_edma(reqp)
SC_REQ *reqp;
{
if (machineid & ATARI_FALCON)
return(falcon_poll_edma(reqp));
else return(tt_poll_edma(reqp));
}
extern __inline__ int
get_dma_result(reqp, bytes_left)
SC_REQ *reqp;
u_long *bytes_left;
{
if (machineid & ATARI_FALCON)
return(falcon_get_dma_result(reqp, bytes_left));
else return(tt_get_dma_result(reqp, bytes_left));
}
extern __inline__ int
can_access_5380()
{
if (machineid & ATARI_FALCON)
return(falcon_can_access_5380());
return(1);
}
#define emulated_dma() ((machineid & ATARI_HADES) ? 1 : 0)
/*
* Locking stuff. All turns into NOP's on the TT.
*/
#define fair_to_keep_dma() ((machineid & ATARI_FALCON) ? \
!st_dmawanted() : 1)
#define claimed_dma() ((machineid & ATARI_FALCON) ? \
falcon_claimed_dma() : 1)
#define reconsider_dma() { \
if(machineid & ATARI_FALCON) \
falcon_reconsider_dma();\
}
#endif /* defined(TT_SCSI) && defined(FALCON_SCSI) */
/**********************************************
* Functions present for both TT and Falcon. *
**********************************************/
/*
* Our autoconfig matching function
*/
static int
machine_match(struct device *pdp, void *match, void *auxp,
struct cfdriver *cd)
{
struct cfdata *cdp = match;
if (strcmp(auxp, cd->cd_name))
return(0);
if (cdp->cf_unit != 0) /* Only one unit */
return(0);
return(1);
}
/*
* Bounce buffer (de)allocation. Those buffers are gotten from the ST-mem
* pool. Allocation here is both contiguous and in the lower 16Mb of
* the address space. Thus being DMA-able for all controllers.
*/
static u_char *
alloc_bounceb(u_long len)
{
void *tmp;
return((u_char *)alloc_stmem(len, &tmp));
}
static void
free_bounceb(u_char *bounceb)
{
free_stmem(bounceb);
}
/*
* 5380 interrupt.
*/
void
scsi_ctrl(int sr)
{
if (GET_5380_REG(NCR5380_DMSTAT) & SC_IRQ_SET) {
scsi_idisable();
if (!BASEPRI(sr))
add_sicallback((si_farg)ncr_ctrl_intr,
(void *)cur_softc, 0);
else {
spl1();
ncr_ctrl_intr(cur_softc);
spl0();
}
}
}
/*
* DMA controller interrupt
*/
void
scsi_dma(int sr)
{
SC_REQ *reqp;
if ((reqp = connected) && (reqp->dr_flag & DRIVER_IN_DMA)) {
scsi_idisable();
if (!BASEPRI(sr))
add_sicallback((si_farg)ncr_dma_intr,
(void *)cur_softc, 0);
else {
spl1();
ncr_dma_intr(cur_softc);
spl0();
}
}
}
/*
* Last but not least... Include the general driver code
*/
#include <atari/dev/ncr5380.c>
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