1151 lines
28 KiB
C
1151 lines
28 KiB
C
/* $NetBSD: atari5380.c,v 1.26 1997/06/04 14:34:03 leo Exp $ */
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/*
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* Copyright (c) 1995 Leo Weppelman.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Leo Weppelman.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/buf.h>
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#include <scsi/scsi_all.h>
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#include <scsi/scsi_message.h>
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#include <scsi/scsiconf.h>
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#include <m68k/asm_single.h>
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#include <m68k/cpu.h>
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#include <m68k/cacheops.h>
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#include <atari/atari/stalloc.h>
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/*
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* Include the driver definitions
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*/
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#include <atari/dev/ncr5380reg.h>
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#include <machine/stdarg.h>
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#include <machine/iomap.h>
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#include <machine/mfp.h>
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#include <atari/atari/intr.h>
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#if defined(FALCON_SCSI)
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#include <machine/dma.h>
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#endif
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/*
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* Set the various driver options
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*/
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#define NREQ 18 /* Size of issue queue */
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#define AUTO_SENSE 1 /* Automatically issue a request-sense */
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#define DRNAME ncrscsi /* used in various prints */
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#undef DBG_SEL /* Show the selection process */
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#undef DBG_REQ /* Show enqueued/ready requests */
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#undef DBG_ERR_RET /* Show requests with != 0 return code */
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#undef DBG_NOWRITE /* Do not allow writes to the targets */
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#undef DBG_PIO /* Show the polled-I/O process */
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#undef DBG_INF /* Show information transfer process */
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#define DBG_NOSTATIC /* No static functions, all in DDB trace*/
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#define DBG_PID 15 /* Keep track of driver */
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#define REAL_DMA /* Use DMA if sensible */
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#if defined(FALCON_SCSI)
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#define REAL_DMA_POLL 1 /* 1: Poll for end of DMA-transfer */
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#else
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#define REAL_DMA_POLL 0 /* 1: Poll for end of DMA-transfer */
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#endif
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#undef USE_PDMA /* Use special pdma-transfer function */
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#define MIN_PHYS 65536 /*BARF!!!!*/
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/*
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* Include more driver definitions
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*/
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#include <atari/dev/ncr5380var.h>
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/*
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* The atari specific driver options
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*/
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#undef NO_TTRAM_DMA /* Do not use DMA to TT-ram. This */
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/* fails on older atari's */
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#define ENABLE_NCR5380(sc) cur_softc = sc;
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static u_char *alloc_bounceb __P((u_long));
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static void free_bounceb __P((u_char *));
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static int machine_match __P((struct device *, void *, void *,
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struct cfdriver *));
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void scsi_ctrl __P((int));
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void scsi_dma __P((int));
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/*
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* Functions that do nothing on the atari
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*/
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#define pdma_ready() 0
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#if defined(TT_SCSI)
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void ncr5380_drq_intr __P((void));
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/*
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* Define all the things we need of the DMA-controller
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*/
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#define SCSI_DMA ((struct scsi_dma *)AD_SCSI_DMA)
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#define SCSI_5380 ((struct scsi_5380 *)AD_NCR5380)
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struct scsi_dma {
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volatile u_char s_dma_ptr[8]; /* use only the odd bytes */
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volatile u_char s_dma_cnt[8]; /* use only the odd bytes */
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volatile u_char s_dma_res[4]; /* data residue register */
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volatile u_char s_dma_gap; /* not used */
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volatile u_char s_dma_ctrl; /* control register */
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volatile u_char s_dma_gap2; /* not used */
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volatile u_char s_hdma_ctrl; /* Hades control register */
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};
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#define set_scsi_dma(addr, val) (void)( \
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{ \
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u_char *address = (u_char*)addr+1; \
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u_long nval = (u_long)val; \
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__asm("movepl %0, %1@(0)": :"d" (nval), "a" (address)); \
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})
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#define get_scsi_dma(addr, res) ( \
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{ \
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u_char *address = (u_char*)addr+1; \
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u_long nval; \
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__asm("movepl %1@(0), %0": "=d" (nval) : "a" (address)); \
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res = (u_long)nval; \
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})
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/*
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* Defines for TT-DMA control register
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*/
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#define SD_BUSERR 0x80 /* 1 = transfer caused bus error*/
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#define SD_ZERO 0x40 /* 1 = byte counter is zero */
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#define SD_ENABLE 0x02 /* 1 = Enable DMA */
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#define SD_OUT 0x01 /* Direction: memory to SCSI */
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#define SD_IN 0x00 /* Direction: SCSI to memory */
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/*
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* Defines for Hades-DMA control register
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*/
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#define SDH_BUSERR 0x02 /* 1 = Bus error */
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#define SDH_EOP 0x01 /* 1 = Signal EOP on 5380 */
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#define SDH_ZERO 0x40 /* 1 = Byte counter is zero */
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/*
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* Define the 5380 register set
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*/
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struct scsi_5380 {
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volatile u_char scsi_5380[16]; /* use only the odd bytes */
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};
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#endif /* TT_SCSI */
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/**********************************************
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* Variables present for both TT and Falcon. *
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**********************************************/
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/*
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* Softc of currently active controller (a bit of fake; we only have one)
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*/
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static struct ncr_softc *cur_softc;
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#if defined(TT_SCSI) && !defined(FALCON_SCSI)
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/*
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* We can be more efficient for some functions when only TT_SCSI is selected
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*/
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#define GET_5380_REG(rnum) SCSI_5380->scsi_5380[(rnum << 1) | 1]
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#define SET_5380_REG(rnum,val) (SCSI_5380->scsi_5380[(rnum << 1) | 1] = val)
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#define scsi_mach_init(sc) scsi_tt_init(sc)
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#define scsi_ienable() scsi_tt_ienable()
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#define scsi_idisable() scsi_tt_idisable()
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#define scsi_clr_ipend() scsi_tt_clr_ipend()
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#define scsi_ipending() (GET_5380_REG(NCR5380_DMSTAT) & SC_IRQ_SET)
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#define scsi_dma_setup(r,p,m) scsi_tt_dmasetup(r, p, m)
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#define wrong_dma_range(r,d) tt_wrong_dma_range(r, d)
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#define poll_edma(reqp) tt_poll_edma(reqp)
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#define get_dma_result(r, b) tt_get_dma_result(r, b)
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#define can_access_5380() 1
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#define emulated_dma() ((machineid & ATARI_HADES) ? 1 : 0)
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#define fair_to_keep_dma() 1
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#define claimed_dma() 1
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#define reconsider_dma()
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#endif /* defined(TT_SCSI) && !defined(FALCON_SCSI) */
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#if defined(TT_SCSI)
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/*
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* Prototype functions defined below
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*/
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#ifdef NO_TTRAM_DMA
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static int tt_wrong_dma_range __P((SC_REQ *, struct dma_chain *));
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#endif
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static void scsi_tt_init __P((struct ncr_softc *));
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static u_char get_tt_5380_reg __P((u_short));
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static void set_tt_5380_reg __P((u_short, u_short));
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static void scsi_tt_dmasetup __P((SC_REQ *, u_int, u_char));
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static int tt_poll_edma __P((SC_REQ *));
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static u_char *ptov __P((SC_REQ *, u_long*));
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static int tt_get_dma_result __P((SC_REQ *, u_long *));
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void scsi_tt_ienable __P((void));
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void scsi_tt_idisable __P((void));
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void scsi_tt_clr_ipend __P((void));
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/*
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* Define these too, so we can use them locally...
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*/
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#define GET_TT_REG(rnum) SCSI_5380->scsi_5380[(rnum << 1) | 1]
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#define SET_TT_REG(rnum,val) (SCSI_5380->scsi_5380[(rnum << 1) | 1] = val)
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#ifdef NO_TTRAM_DMA
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static int
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tt_wrong_dma_range(reqp, dm)
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SC_REQ *reqp;
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struct dma_chain *dm;
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{
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if (dm->dm_addr & 0xff000000) {
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reqp->dr_flag |= DRIVER_BOUNCING;
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return(1);
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}
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return(0);
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}
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#else
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#define tt_wrong_dma_range(reqp, dm) 0
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#endif
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static void
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scsi_tt_init(struct ncr_softc *sc)
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{
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/*
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* Enable SCSI-related interrupts
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*/
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MFP2->mf_aer |= 0x80; /* SCSI IRQ goes HIGH!!!!! */
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if (machineid & ATARI_TT) {
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/* SCSI-dma interrupts */
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MFP2->mf_ierb |= IB_SCDM;
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MFP2->mf_iprb &= ~IB_SCDM;
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MFP2->mf_imrb |= IB_SCDM;
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}
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else if (machineid & ATARI_HADES) {
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SCSI_DMA->s_hdma_ctrl = 0;
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if (intr_establish(2, AUTO_VEC, 0,
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(hw_ifun_t)ncr5380_drq_intr,
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NULL) == NULL)
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panic("scsi_tt_init: Can't establish drq-interrupt");
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}
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else panic("scsi_tt_init: should not come here");
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MFP2->mf_iera |= IA_SCSI; /* SCSI-5380 interrupts */
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MFP2->mf_ipra &= ~IA_SCSI;
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MFP2->mf_imra |= IA_SCSI;
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/*
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* LWP: DMA transfers to TT-ram causes data to be garbeled
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* without notice on some revisons of the TT-mainboard.
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* When program's generate misterious Segmentations faults,
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* try turning on NO_TTRAM_DMA.
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*/
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#ifdef NO_TTRAM_DMA
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printf(": DMA to TT-RAM is disabled!");
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#endif
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}
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static u_char
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get_tt_5380_reg(u_short rnum)
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{
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return(SCSI_5380->scsi_5380[(rnum << 1) | 1]);
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}
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static void
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set_tt_5380_reg(u_short rnum, u_short val)
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{
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SCSI_5380->scsi_5380[(rnum << 1) | 1] = val;
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}
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extern __inline__ void
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scsi_tt_ienable(void)
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{
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if (machineid & ATARI_TT)
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single_inst_bset_b(MFP2->mf_imrb, IB_SCDM);
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single_inst_bset_b(MFP2->mf_imra, IA_SCSI);
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}
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extern __inline__ void
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scsi_tt_idisable(void)
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{
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if (machineid & ATARI_TT)
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single_inst_bclr_b(MFP2->mf_imrb, IB_SCDM);
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single_inst_bclr_b(MFP2->mf_imra, IA_SCSI);
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}
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extern __inline__ void
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scsi_tt_clr_ipend(void)
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{
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int tmp;
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SCSI_DMA->s_dma_ctrl = 0;
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tmp = GET_TT_REG(NCR5380_IRCV);
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if (machineid & ATARI_TT)
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single_inst_bclr_b(MFP2->mf_iprb, IB_SCDM);
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single_inst_bclr_b(MFP2->mf_ipra, IA_SCSI);
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/*
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* Remove interrupts already scheduled.
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*/
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rem_sicallback((si_farg)ncr_ctrl_intr);
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rem_sicallback((si_farg)ncr_dma_intr);
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}
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static void
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scsi_tt_dmasetup(SC_REQ *reqp, u_int phase, u_char mode)
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{
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if (PH_IN(phase)) {
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SCSI_DMA->s_dma_ctrl = SD_IN;
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if (machineid & ATARI_HADES)
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SCSI_DMA->s_hdma_ctrl &= ~(SDH_BUSERR|SDH_EOP);
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set_scsi_dma(&(SCSI_DMA->s_dma_ptr), reqp->dm_cur->dm_addr);
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set_scsi_dma(&(SCSI_DMA->s_dma_cnt), reqp->dm_cur->dm_count);
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SET_TT_REG(NCR5380_ICOM, 0);
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SET_TT_REG(NCR5380_MODE, mode);
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SCSI_DMA->s_dma_ctrl = SD_ENABLE;
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SET_TT_REG(NCR5380_IRCV, 0);
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}
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else {
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SCSI_DMA->s_dma_ctrl = SD_OUT;
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if (machineid & ATARI_HADES)
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SCSI_DMA->s_hdma_ctrl &= ~(SDH_BUSERR|SDH_EOP);
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set_scsi_dma(&(SCSI_DMA->s_dma_ptr), reqp->dm_cur->dm_addr);
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set_scsi_dma(&(SCSI_DMA->s_dma_cnt), reqp->dm_cur->dm_count);
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SET_TT_REG(NCR5380_MODE, mode);
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SET_TT_REG(NCR5380_ICOM, SC_ADTB);
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SET_TT_REG(NCR5380_DMSTAT, 0);
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SCSI_DMA->s_dma_ctrl = SD_ENABLE|SD_OUT;
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}
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}
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static int
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tt_poll_edma(SC_REQ *reqp)
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{
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u_char dmstat, dmastat;
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int timeout = 9000; /* XXX */
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/*
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* We wait here until the DMA has finished. This can be
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* achieved by checking the following conditions:
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* - 5380:
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* - End of DMA flag is set
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* - We lost BSY (error!!)
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* - A phase mismatch has occured (partial transfer)
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* - DMA-controller:
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* - A bus error occurred (Kernel error!!)
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* - All bytes are transferred
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* If one of the terminating conditions was met, we call
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* 'dma_ready' to check errors and perform the bookkeeping.
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*/
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for (;;) {
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delay(20);
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if (--timeout <= 0) {
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ncr_tprint(reqp, "timeout on polled transfer\n");
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reqp->xs->error = XS_TIMEOUT;
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return(0);
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}
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dmstat = GET_TT_REG(NCR5380_DMSTAT);
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if ((machineid & ATARI_HADES) && (dmstat & SC_DMA_REQ)) {
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ncr5380_drq_intr();
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dmstat = GET_TT_REG(NCR5380_DMSTAT);
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}
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dmastat = SCSI_DMA->s_dma_ctrl;
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if (dmstat & (SC_END_DMA|SC_BSY_ERR|SC_IRQ_SET))
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break;
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if (!(dmstat & SC_PHS_MTCH))
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break;
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if (dmastat & (SD_BUSERR|SD_ZERO))
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break;
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}
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return(1);
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}
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/*
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* Convert physical DMA address to a virtual address.
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*/
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static u_char *
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ptov(SC_REQ *reqp, u_long *phaddr)
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{
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struct dma_chain *dm;
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u_char *vaddr;
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dm = reqp->dm_chain;
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vaddr = reqp->xdata_ptr;
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for(; dm < reqp->dm_cur; dm++)
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vaddr += dm->dm_count;
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vaddr += (u_long)phaddr - dm->dm_addr;
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return(vaddr);
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}
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static int
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tt_get_dma_result(SC_REQ *reqp, u_long *bytes_left)
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{
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int dmastat, dmstat;
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u_char *byte_p;
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u_long leftover;
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dmastat = SCSI_DMA->s_dma_ctrl;
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dmstat = GET_TT_REG(NCR5380_DMSTAT);
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get_scsi_dma(SCSI_DMA->s_dma_cnt, leftover);
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get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)byte_p);
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if (dmastat & SD_BUSERR) {
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/*
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* The DMA-controller seems to access 8 bytes beyond
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* it's limits on output. Therefore check also the byte
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* count. If it's zero, ignore the bus error.
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*/
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if (leftover != 0) {
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ncr_tprint(reqp,
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"SCSI-DMA buserror - accessing 0x%x\n", byte_p);
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reqp->xs->error = XS_DRIVER_STUFFUP;
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}
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}
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/*
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* We handle the following special condition below:
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* -- The device disconnects in the middle of a write operation --
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* In this case, the 5380 has already pre-fetched the next byte from
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* the DMA-controller before the phase mismatch occurs. Therefore,
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* leftover is 1 too low.
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* This does not always happen! Therefore, we only do this when
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* leftover is odd. This assumes that DMA transfers are _even_! This
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* is normally the case on disks and types but might not always be.
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* XXX: Check if ACK is consistently high on these occasions LWP
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*/
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if ((leftover & 1) && !(dmstat & SC_PHS_MTCH) && PH_OUT(reqp->phase))
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leftover++;
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/*
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* Check if there are some 'restbytes' left in the DMA-controller.
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*/
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if ((machineid & ATARI_TT) && ((u_long)byte_p & 3)
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&& PH_IN(reqp->phase)) {
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u_char *p, *q;
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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()
|
|
{
|
|
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
|
|
*/
|
|
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 (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;
|
|
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;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Schedule an interrupt
|
|
*/
|
|
if (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;
|
|
|
|
/*
|
|
* OK. No bus error occurred above. Clear the nofault flag
|
|
* so we no longer short-circuit bus errors.
|
|
*/
|
|
nofault = (int *) 0;
|
|
|
|
/*
|
|
* 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");
|
|
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>
|