/* $NetBSD: atari5380.c,v 1.1 1995/08/11 20:03:02 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 #include #include #include #include #include #include #include /* * Include the driver definitions */ #include #include #include #include #if defined(FALCON_SCSI) #include #endif /* * This is crap, but because the interrupts now run at MFP spl-level (6), * splbio() is not enough at some places. The code should be checked to * find out where splhigh() is needed and where splbio() should be used. * Now that I use this interrupt sceme, the spl values are fake! */ #undef splbio() #define splbio() splhigh() /* * 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_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 /* 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 */ /* * 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; #if defined(TT_SCSI) /* * 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 */ }; #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 */ /* * 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_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 fair_to_keep_dma() 1 #define claimed_dma() 1 #define reconsider_dma() #endif /* defined(TT_SCSI) && !defined(FALCON_SCSI) */ #if defined(TT_SCSI) /* * 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(sc) struct ncr_softc *sc; { /* * Enable SCSI-related interrupts */ MFP2->mf_aer |= 0x80; /* SCSI IRQ goes HIGH!!!!! */ MFP2->mf_ierb |= IB_SCDM; /* SCSI-dma interrupts */ MFP2->mf_iprb &= ~IB_SCDM; MFP2->mf_imrb |= IB_SCDM; 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(rnum) u_short rnum; { return(SCSI_5380->scsi_5380[(rnum << 1) | 1]); } static void set_tt_5380_reg(rnum, val) u_short rnum, val; { SCSI_5380->scsi_5380[(rnum << 1) | 1] = val; } extern __inline__ void scsi_tt_ienable() { int sps = splbio(); MFP2->mf_ierb |= IB_SCDM; MFP2->mf_iera |= IA_SCSI; splx(sps); } extern __inline__ scsi_tt_idisable() { int sps = splbio(); MFP2->mf_ierb &= ~IB_SCDM; MFP2->mf_iera &= ~IA_SCSI; splx(sps); } extern __inline__ scsi_tt_clr_ipend() { int tmp; SCSI_DMA->s_dma_ctrl = 0; tmp = GET_TT_REG(NCR5380_IRCV); } static void scsi_tt_dmasetup(reqp, phase, mode) SC_REQ *reqp; u_int phase; u_char mode; { if (PH_IN(phase)) { SCSI_DMA->s_dma_ctrl = SD_IN; 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; 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(reqp) 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. */ for (;;) { delay(20); if (--timeout <= 0) { ncr_tprint(reqp, "timeout on polled transfer\n"); reqp->xs->error = XS_DRIVER_STUFFUP; return(0); } 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; } return(1); } static int tt_get_dma_result(reqp, bytes_left) 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 (((u_long)byte_p & 3) && PH_IN(reqp->phase)) { u_char *p, *q; printf("There are %d restbytes!!\n", (u_long)byte_p & 3); #if 0 p = (u_char*)(leftover & ~3); q = (u_char*)&(SCSI_DMA->s_dma_res); switch (leftover & 3) { case 3: *p++ = *q++; case 2: *p++ = *q++; case 1: *p++ = *q++; printf("SCSI: dma residue count != 0, "); printf("Check buffer alignment\n"); } #endif } *bytes_left = leftover; return ((dmastat & (SD_BUSERR|SD_ZERO)) ? 1 : 0); } #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_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 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) static void fscsi_int __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() { MFP->mf_ierb |= IB_DINT; } extern __inline__ scsi_falcon_idisable() { MFP->mf_ierb &= ~IB_DINT; } extern __inline__ scsi_falcon_clr_ipend() { int tmp; tmp = get_falcon_5380_reg(NCR5380_IRCV); } 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); } return(0); } static int falcon_lock = 0; extern __inline__ falcon_claimed_dma() { if (!(falcon_lock & DMA_LOCK_GRANT)) { if (falcon_lock) { /* * DMA access is being claimed. */ return(0); } if (!st_dmagrab(fscsi_int, run_main, &connected,&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. */ st_dmafree(&connected, &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(fscsi_int, run_main, &connected, &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; delay(40); /* XXX: LWP - is this really needed ? */ DMA->dma_data = nsects; delay(40); /* XXX: LWP - is this really needed ? */ DMA->dma_mode = 0x10 | dir; delay(40); /* XXX: LWP - is this really needed ? */ } 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); } } /* * Falcon SCSI interrupt. _Always_ called at spl1! */ static void fscsi_int() { int itype; int dma_done; if (get_falcon_5380_reg(NCR5380_DMSTAT) & SC_IRQ_SET) { scsi_falcon_idisable(); ncr_ctrl_intr(cur_softc); } } 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_DRIVER_STUFFUP; 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; } if (st_dmastat & 0x02) { /* * Bytecount not zero.... As the fifo loads in 16 byte * chunks, check if bytes are stuck in fifo. * As we don't use DMA on chunks less than 512 bytes * on the Falcon, report any residual not a multiple of * 512 as an error... */ bytes_done = st_dmaaddr_get() - reqp->dm_cur->dm_addr; if (bytes_done & 511) { ncr_tprint(reqp, "Some bytes stuck in fifo\n"); bytes_done &= ~511; reqp->xs->error = XS_DRIVER_STUFFUP; } *bytes_left = reqp->dm_cur->dm_count - bytes_done; } else { *bytes_left = 0; rv = 1; } return(rv); } #endif /* defined(FALCON_SCSI) */ #if defined(TT_SCSI) && defined(FALCON_SCSI) /* * Define some functions to support _both_ TT and Falcon SCSI */ /* * Register access will be done through the following 2 function pointers. */ static u_char (*get_5380_reg)(); static void (*set_5380_reg)(); #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__ scsi_clr_ipend() { if (machineid & ATARI_FALCON) scsi_falcon_clr_ipend(); else scsi_tt_clr_ipend(); } extern __inline__ 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)); } /* * 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(pdp, cdp, auxp, cd) struct device *pdp; struct cfdata *cdp; void *auxp; struct cfdriver *cd; { 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(len) u_long len; { u_long tmp; return((u_char *)alloc_stmem(len, &tmp)); } static void free_bounceb(bounceb) u_char *bounceb; { free_stmem(bounceb); } /* * 5380 interrupt. */ scsi_ctrl(sr) int sr; /* sr at time of interrupt */ { if (GET_5380_REG(NCR5380_DMSTAT) & SC_IRQ_SET) { scsi_idisable(); if (!BASEPRI(sr)) add_sicallback(ncr_ctrl_intr, cur_softc, 0); else { spl1(); ncr_ctrl_intr(cur_softc); } } } /* * DMA controller interrupt */ scsi_dma(sr) int sr; /* sr at time of interrupt */ { SC_REQ *reqp; if ((reqp = connected) && (reqp->dr_flag & DRIVER_IN_DMA)) { scsi_idisable(); if (!BASEPRI(sr)) add_sicallback(ncr_dma_intr, cur_softc, 0); else { spl1(); ncr_dma_intr(cur_softc); } } } /* * Last but not least... Include the general driver code */ #include "atari/dev/ncr5380.c"