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1121 lines
35 KiB
C
1121 lines
35 KiB
C
/*
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* atari_scsi.c -- Device dependent functions for the Atari generic SCSI port
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*
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* Copyright 1994 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
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*
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* Loosely based on the work of Robert De Vries' team and added:
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* - working real DMA
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* - Falcon support (untested yet!) ++bjoern fixed and now it works
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* - lots of extensions and bug fixes.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*
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*/
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/**************************************************************************/
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/* */
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/* Notes for Falcon SCSI: */
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/* ---------------------- */
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/* */
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/* Since the Falcon SCSI uses the ST-DMA chip, that is shared among */
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/* several device drivers, locking and unlocking the access to this */
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/* chip is required. But locking is not possible from an interrupt, */
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/* since it puts the process to sleep if the lock is not available. */
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/* This prevents "late" locking of the DMA chip, i.e. locking it just */
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/* before using it, since in case of disconnection-reconnection */
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/* commands, the DMA is started from the reselection interrupt. */
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/* */
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/* Two possible schemes for ST-DMA-locking would be: */
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/* 1) The lock is taken for each command separately and disconnecting */
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/* is forbidden (i.e. can_queue = 1). */
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/* 2) The DMA chip is locked when the first command comes in and */
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/* released when the last command is finished and all queues are */
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/* empty. */
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/* The first alternative would result in bad performance, since the */
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/* interleaving of commands would not be used. The second is unfair to */
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/* other drivers using the ST-DMA, because the queues will seldom be */
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/* totally empty if there is a lot of disk traffic. */
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/* */
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/* For this reasons I decided to employ a more elaborate scheme: */
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/* - First, we give up the lock every time we can (for fairness), this */
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/* means every time a command finishes and there are no other commands */
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/* on the disconnected queue. */
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/* - If there are others waiting to lock the DMA chip, we stop */
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/* issuing commands, i.e. moving them onto the issue queue. */
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/* Because of that, the disconnected queue will run empty in a */
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/* while. Instead we go to sleep on a 'fairness_queue'. */
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/* - If the lock is released, all processes waiting on the fairness */
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/* queue will be woken. The first of them tries to re-lock the DMA, */
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/* the others wait for the first to finish this task. After that, */
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/* they can all run on and do their commands... */
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/* This sounds complicated (and it is it :-(), but it seems to be a */
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/* good compromise between fairness and performance: As long as no one */
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/* else wants to work with the ST-DMA chip, SCSI can go along as */
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/* usual. If now someone else comes, this behaviour is changed to a */
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/* "fairness mode": just already initiated commands are finished and */
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/* then the lock is released. The other one waiting will probably win */
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/* the race for locking the DMA, since it was waiting for longer. And */
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/* after it has finished, SCSI can go ahead again. Finally: I hope I */
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/* have not produced any deadlock possibilities! */
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/* */
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/**************************************************************************/
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#include <linux/module.h>
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#define NDEBUG (0)
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#define NDEBUG_ABORT 0x00100000
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#define NDEBUG_TAGS 0x00200000
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#define NDEBUG_MERGING 0x00400000
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#define AUTOSENSE
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/* For the Atari version, use only polled IO or REAL_DMA */
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#define REAL_DMA
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/* Support tagged queuing? (on devices that are able to... :-) */
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#define SUPPORT_TAGS
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#define MAX_TAGS 32
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#include <linux/types.h>
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#include <linux/stddef.h>
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#include <linux/ctype.h>
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#include <linux/delay.h>
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#include <linux/mm.h>
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#include <linux/blkdev.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/nvram.h>
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#include <linux/bitops.h>
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#include <asm/setup.h>
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#include <asm/atarihw.h>
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#include <asm/atariints.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/irq.h>
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#include <asm/traps.h>
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#include "scsi.h"
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#include <scsi/scsi_host.h>
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#include "atari_scsi.h"
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#include "NCR5380.h"
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#include <asm/atari_stdma.h>
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#include <asm/atari_stram.h>
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#include <asm/io.h>
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#include <linux/stat.h>
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#define IS_A_TT() ATARIHW_PRESENT(TT_SCSI)
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#define SCSI_DMA_WRITE_P(elt,val) \
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do { \
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unsigned long v = val; \
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tt_scsi_dma.elt##_lo = v & 0xff; \
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v >>= 8; \
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tt_scsi_dma.elt##_lmd = v & 0xff; \
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v >>= 8; \
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tt_scsi_dma.elt##_hmd = v & 0xff; \
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v >>= 8; \
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tt_scsi_dma.elt##_hi = v & 0xff; \
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} while(0)
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#define SCSI_DMA_READ_P(elt) \
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(((((((unsigned long)tt_scsi_dma.elt##_hi << 8) | \
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(unsigned long)tt_scsi_dma.elt##_hmd) << 8) | \
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(unsigned long)tt_scsi_dma.elt##_lmd) << 8) | \
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(unsigned long)tt_scsi_dma.elt##_lo)
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static inline void SCSI_DMA_SETADR(unsigned long adr)
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{
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st_dma.dma_lo = (unsigned char)adr;
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MFPDELAY();
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adr >>= 8;
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st_dma.dma_md = (unsigned char)adr;
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MFPDELAY();
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adr >>= 8;
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st_dma.dma_hi = (unsigned char)adr;
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MFPDELAY();
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}
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static inline unsigned long SCSI_DMA_GETADR(void)
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{
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unsigned long adr;
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adr = st_dma.dma_lo;
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MFPDELAY();
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adr |= (st_dma.dma_md & 0xff) << 8;
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MFPDELAY();
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adr |= (st_dma.dma_hi & 0xff) << 16;
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MFPDELAY();
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return adr;
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}
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static inline void ENABLE_IRQ(void)
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{
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if (IS_A_TT())
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atari_enable_irq(IRQ_TT_MFP_SCSI);
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else
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atari_enable_irq(IRQ_MFP_FSCSI);
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}
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static inline void DISABLE_IRQ(void)
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{
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if (IS_A_TT())
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atari_disable_irq(IRQ_TT_MFP_SCSI);
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else
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atari_disable_irq(IRQ_MFP_FSCSI);
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}
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#define HOSTDATA_DMALEN (((struct NCR5380_hostdata *) \
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(atari_scsi_host->hostdata))->dma_len)
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/* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
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* we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
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* need ten times the standard value... */
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#ifndef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
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#define AFTER_RESET_DELAY (HZ/2)
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#else
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#define AFTER_RESET_DELAY (5*HZ/2)
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#endif
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/***************************** Prototypes *****************************/
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#ifdef REAL_DMA
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static int scsi_dma_is_ignored_buserr(unsigned char dma_stat);
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static void atari_scsi_fetch_restbytes(void);
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static long atari_scsi_dma_residual(struct Scsi_Host *instance);
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static int falcon_classify_cmd(Scsi_Cmnd *cmd);
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static unsigned long atari_dma_xfer_len(unsigned long wanted_len,
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Scsi_Cmnd *cmd, int write_flag);
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#endif
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static irqreturn_t scsi_tt_intr(int irq, void *dummy);
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static irqreturn_t scsi_falcon_intr(int irq, void *dummy);
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static void falcon_release_lock_if_possible(struct NCR5380_hostdata *hostdata);
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static void falcon_get_lock(void);
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#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
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static void atari_scsi_reset_boot(void);
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#endif
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static unsigned char atari_scsi_tt_reg_read(unsigned char reg);
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static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value);
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static unsigned char atari_scsi_falcon_reg_read(unsigned char reg);
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static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value);
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/************************* End of Prototypes **************************/
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static struct Scsi_Host *atari_scsi_host;
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static unsigned char (*atari_scsi_reg_read)(unsigned char reg);
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static void (*atari_scsi_reg_write)(unsigned char reg, unsigned char value);
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#ifdef REAL_DMA
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static unsigned long atari_dma_residual, atari_dma_startaddr;
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static short atari_dma_active;
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/* pointer to the dribble buffer */
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static char *atari_dma_buffer;
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/* precalculated physical address of the dribble buffer */
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static unsigned long atari_dma_phys_buffer;
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/* != 0 tells the Falcon int handler to copy data from the dribble buffer */
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static char *atari_dma_orig_addr;
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/* size of the dribble buffer; 4k seems enough, since the Falcon cannot use
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* scatter-gather anyway, so most transfers are 1024 byte only. In the rare
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* cases where requests to physical contiguous buffers have been merged, this
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* request is <= 4k (one page). So I don't think we have to split transfers
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* just due to this buffer size...
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*/
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#define STRAM_BUFFER_SIZE (4096)
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/* mask for address bits that can't be used with the ST-DMA */
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static unsigned long atari_dma_stram_mask;
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#define STRAM_ADDR(a) (((a) & atari_dma_stram_mask) == 0)
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/* number of bytes to cut from a transfer to handle NCR overruns */
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static int atari_read_overruns;
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#endif
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static int setup_can_queue = -1;
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module_param(setup_can_queue, int, 0);
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static int setup_cmd_per_lun = -1;
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module_param(setup_cmd_per_lun, int, 0);
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static int setup_sg_tablesize = -1;
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module_param(setup_sg_tablesize, int, 0);
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#ifdef SUPPORT_TAGS
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static int setup_use_tagged_queuing = -1;
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module_param(setup_use_tagged_queuing, int, 0);
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#endif
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static int setup_hostid = -1;
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module_param(setup_hostid, int, 0);
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#if defined(REAL_DMA)
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static int scsi_dma_is_ignored_buserr(unsigned char dma_stat)
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{
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int i;
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unsigned long addr = SCSI_DMA_READ_P(dma_addr), end_addr;
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if (dma_stat & 0x01) {
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/* A bus error happens when DMA-ing from the last page of a
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* physical memory chunk (DMA prefetch!), but that doesn't hurt.
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* Check for this case:
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*/
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for (i = 0; i < m68k_num_memory; ++i) {
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end_addr = m68k_memory[i].addr + m68k_memory[i].size;
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if (end_addr <= addr && addr <= end_addr + 4)
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return 1;
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}
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}
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return 0;
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}
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#if 0
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/* Dead code... wasn't called anyway :-) and causes some trouble, because at
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* end-of-DMA, both SCSI ints are triggered simultaneously, so the NCR int has
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* to clear the DMA int pending bit before it allows other level 6 interrupts.
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*/
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static void scsi_dma_buserr(int irq, void *dummy)
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{
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unsigned char dma_stat = tt_scsi_dma.dma_ctrl;
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/* Don't do anything if a NCR interrupt is pending. Probably it's just
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* masked... */
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if (atari_irq_pending(IRQ_TT_MFP_SCSI))
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return;
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printk("Bad SCSI DMA interrupt! dma_addr=0x%08lx dma_stat=%02x dma_cnt=%08lx\n",
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SCSI_DMA_READ_P(dma_addr), dma_stat, SCSI_DMA_READ_P(dma_cnt));
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if (dma_stat & 0x80) {
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if (!scsi_dma_is_ignored_buserr(dma_stat))
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printk("SCSI DMA bus error -- bad DMA programming!\n");
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} else {
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/* Under normal circumstances we never should get to this point,
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* since both interrupts are triggered simultaneously and the 5380
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* int has higher priority. When this irq is handled, that DMA
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* interrupt is cleared. So a warning message is printed here.
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*/
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printk("SCSI DMA intr ?? -- this shouldn't happen!\n");
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}
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}
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#endif
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#endif
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static irqreturn_t scsi_tt_intr(int irq, void *dummy)
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{
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#ifdef REAL_DMA
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int dma_stat;
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dma_stat = tt_scsi_dma.dma_ctrl;
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INT_PRINTK("scsi%d: NCR5380 interrupt, DMA status = %02x\n",
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atari_scsi_host->host_no, dma_stat & 0xff);
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/* Look if it was the DMA that has interrupted: First possibility
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* is that a bus error occurred...
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*/
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if (dma_stat & 0x80) {
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if (!scsi_dma_is_ignored_buserr(dma_stat)) {
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printk(KERN_ERR "SCSI DMA caused bus error near 0x%08lx\n",
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SCSI_DMA_READ_P(dma_addr));
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printk(KERN_CRIT "SCSI DMA bus error -- bad DMA programming!");
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}
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}
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/* If the DMA is active but not finished, we have the case
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* that some other 5380 interrupt occurred within the DMA transfer.
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* This means we have residual bytes, if the desired end address
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* is not yet reached. Maybe we have to fetch some bytes from the
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* rest data register, too. The residual must be calculated from
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* the address pointer, not the counter register, because only the
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* addr reg counts bytes not yet written and pending in the rest
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* data reg!
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*/
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if ((dma_stat & 0x02) && !(dma_stat & 0x40)) {
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atari_dma_residual = HOSTDATA_DMALEN - (SCSI_DMA_READ_P(dma_addr) - atari_dma_startaddr);
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DMA_PRINTK("SCSI DMA: There are %ld residual bytes.\n",
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atari_dma_residual);
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if ((signed int)atari_dma_residual < 0)
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atari_dma_residual = 0;
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if ((dma_stat & 1) == 0) {
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/*
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* After read operations, we maybe have to
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* transport some rest bytes
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*/
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atari_scsi_fetch_restbytes();
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} else {
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/*
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* There seems to be a nasty bug in some SCSI-DMA/NCR
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* combinations: If a target disconnects while a write
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* operation is going on, the address register of the
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* DMA may be a few bytes farer than it actually read.
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* This is probably due to DMA prefetching and a delay
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* between DMA and NCR. Experiments showed that the
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* dma_addr is 9 bytes to high, but this could vary.
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* The problem is, that the residual is thus calculated
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* wrong and the next transfer will start behind where
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* it should. So we round up the residual to the next
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* multiple of a sector size, if it isn't already a
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* multiple and the originally expected transfer size
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* was. The latter condition is there to ensure that
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* the correction is taken only for "real" data
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* transfers and not for, e.g., the parameters of some
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* other command. These shouldn't disconnect anyway.
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*/
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if (atari_dma_residual & 0x1ff) {
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DMA_PRINTK("SCSI DMA: DMA bug corrected, "
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"difference %ld bytes\n",
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512 - (atari_dma_residual & 0x1ff));
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atari_dma_residual = (atari_dma_residual + 511) & ~0x1ff;
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}
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}
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tt_scsi_dma.dma_ctrl = 0;
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}
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/* If the DMA is finished, fetch the rest bytes and turn it off */
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if (dma_stat & 0x40) {
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atari_dma_residual = 0;
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if ((dma_stat & 1) == 0)
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atari_scsi_fetch_restbytes();
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tt_scsi_dma.dma_ctrl = 0;
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}
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#endif /* REAL_DMA */
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NCR5380_intr(irq, dummy);
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#if 0
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/* To be sure the int is not masked */
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atari_enable_irq(IRQ_TT_MFP_SCSI);
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#endif
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return IRQ_HANDLED;
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}
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static irqreturn_t scsi_falcon_intr(int irq, void *dummy)
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{
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#ifdef REAL_DMA
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int dma_stat;
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/* Turn off DMA and select sector counter register before
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* accessing the status register (Atari recommendation!)
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*/
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st_dma.dma_mode_status = 0x90;
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dma_stat = st_dma.dma_mode_status;
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/* Bit 0 indicates some error in the DMA process... don't know
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* what happened exactly (no further docu).
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*/
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if (!(dma_stat & 0x01)) {
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/* DMA error */
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printk(KERN_CRIT "SCSI DMA error near 0x%08lx!\n", SCSI_DMA_GETADR());
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}
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/* If the DMA was active, but now bit 1 is not clear, it is some
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* other 5380 interrupt that finishes the DMA transfer. We have to
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* calculate the number of residual bytes and give a warning if
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* bytes are stuck in the ST-DMA fifo (there's no way to reach them!)
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*/
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if (atari_dma_active && (dma_stat & 0x02)) {
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unsigned long transferred;
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transferred = SCSI_DMA_GETADR() - atari_dma_startaddr;
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/* The ST-DMA address is incremented in 2-byte steps, but the
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* data are written only in 16-byte chunks. If the number of
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* transferred bytes is not divisible by 16, the remainder is
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* lost somewhere in outer space.
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*/
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if (transferred & 15)
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printk(KERN_ERR "SCSI DMA error: %ld bytes lost in "
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"ST-DMA fifo\n", transferred & 15);
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atari_dma_residual = HOSTDATA_DMALEN - transferred;
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DMA_PRINTK("SCSI DMA: There are %ld residual bytes.\n",
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atari_dma_residual);
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} else
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atari_dma_residual = 0;
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atari_dma_active = 0;
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if (atari_dma_orig_addr) {
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/* If the dribble buffer was used on a read operation, copy the DMA-ed
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* data to the original destination address.
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*/
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memcpy(atari_dma_orig_addr, phys_to_virt(atari_dma_startaddr),
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HOSTDATA_DMALEN - atari_dma_residual);
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atari_dma_orig_addr = NULL;
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}
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#endif /* REAL_DMA */
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NCR5380_intr(irq, dummy);
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return IRQ_HANDLED;
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}
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#ifdef REAL_DMA
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static void atari_scsi_fetch_restbytes(void)
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{
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int nr;
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char *src, *dst;
|
|
unsigned long phys_dst;
|
|
|
|
/* fetch rest bytes in the DMA register */
|
|
phys_dst = SCSI_DMA_READ_P(dma_addr);
|
|
nr = phys_dst & 3;
|
|
if (nr) {
|
|
/* there are 'nr' bytes left for the last long address
|
|
before the DMA pointer */
|
|
phys_dst ^= nr;
|
|
DMA_PRINTK("SCSI DMA: there are %d rest bytes for phys addr 0x%08lx",
|
|
nr, phys_dst);
|
|
/* The content of the DMA pointer is a physical address! */
|
|
dst = phys_to_virt(phys_dst);
|
|
DMA_PRINTK(" = virt addr %p\n", dst);
|
|
for (src = (char *)&tt_scsi_dma.dma_restdata; nr != 0; --nr)
|
|
*dst++ = *src++;
|
|
}
|
|
}
|
|
#endif /* REAL_DMA */
|
|
|
|
|
|
static int falcon_got_lock = 0;
|
|
static DECLARE_WAIT_QUEUE_HEAD(falcon_fairness_wait);
|
|
static int falcon_trying_lock = 0;
|
|
static DECLARE_WAIT_QUEUE_HEAD(falcon_try_wait);
|
|
static int falcon_dont_release = 0;
|
|
|
|
/* This function releases the lock on the DMA chip if there is no
|
|
* connected command and the disconnected queue is empty. On
|
|
* releasing, instances of falcon_get_lock are awoken, that put
|
|
* themselves to sleep for fairness. They can now try to get the lock
|
|
* again (but others waiting longer more probably will win).
|
|
*/
|
|
|
|
static void falcon_release_lock_if_possible(struct NCR5380_hostdata *hostdata)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (IS_A_TT())
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (falcon_got_lock && !hostdata->disconnected_queue &&
|
|
!hostdata->issue_queue && !hostdata->connected) {
|
|
|
|
if (falcon_dont_release) {
|
|
#if 0
|
|
printk("WARNING: Lock release not allowed. Ignored\n");
|
|
#endif
|
|
local_irq_restore(flags);
|
|
return;
|
|
}
|
|
falcon_got_lock = 0;
|
|
stdma_release();
|
|
wake_up(&falcon_fairness_wait);
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/* This function manages the locking of the ST-DMA.
|
|
* If the DMA isn't locked already for SCSI, it tries to lock it by
|
|
* calling stdma_lock(). But if the DMA is locked by the SCSI code and
|
|
* there are other drivers waiting for the chip, we do not issue the
|
|
* command immediately but wait on 'falcon_fairness_queue'. We will be
|
|
* waked up when the DMA is unlocked by some SCSI interrupt. After that
|
|
* we try to get the lock again.
|
|
* But we must be prepared that more than one instance of
|
|
* falcon_get_lock() is waiting on the fairness queue. They should not
|
|
* try all at once to call stdma_lock(), one is enough! For that, the
|
|
* first one sets 'falcon_trying_lock', others that see that variable
|
|
* set wait on the queue 'falcon_try_wait'.
|
|
* Complicated, complicated.... Sigh...
|
|
*/
|
|
|
|
static void falcon_get_lock(void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (IS_A_TT())
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
|
|
while (!in_irq() && falcon_got_lock && stdma_others_waiting())
|
|
sleep_on(&falcon_fairness_wait);
|
|
|
|
while (!falcon_got_lock) {
|
|
if (in_irq())
|
|
panic("Falcon SCSI hasn't ST-DMA lock in interrupt");
|
|
if (!falcon_trying_lock) {
|
|
falcon_trying_lock = 1;
|
|
stdma_lock(scsi_falcon_intr, NULL);
|
|
falcon_got_lock = 1;
|
|
falcon_trying_lock = 0;
|
|
wake_up(&falcon_try_wait);
|
|
} else {
|
|
sleep_on(&falcon_try_wait);
|
|
}
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
if (!falcon_got_lock)
|
|
panic("Falcon SCSI: someone stole the lock :-(\n");
|
|
}
|
|
|
|
|
|
static int __init atari_scsi_detect(struct scsi_host_template *host)
|
|
{
|
|
static int called = 0;
|
|
struct Scsi_Host *instance;
|
|
|
|
if (!MACH_IS_ATARI ||
|
|
(!ATARIHW_PRESENT(ST_SCSI) && !ATARIHW_PRESENT(TT_SCSI)) ||
|
|
called)
|
|
return 0;
|
|
|
|
host->proc_name = "Atari";
|
|
|
|
atari_scsi_reg_read = IS_A_TT() ? atari_scsi_tt_reg_read :
|
|
atari_scsi_falcon_reg_read;
|
|
atari_scsi_reg_write = IS_A_TT() ? atari_scsi_tt_reg_write :
|
|
atari_scsi_falcon_reg_write;
|
|
|
|
/* setup variables */
|
|
host->can_queue =
|
|
(setup_can_queue > 0) ? setup_can_queue :
|
|
IS_A_TT() ? ATARI_TT_CAN_QUEUE : ATARI_FALCON_CAN_QUEUE;
|
|
host->cmd_per_lun =
|
|
(setup_cmd_per_lun > 0) ? setup_cmd_per_lun :
|
|
IS_A_TT() ? ATARI_TT_CMD_PER_LUN : ATARI_FALCON_CMD_PER_LUN;
|
|
/* Force sg_tablesize to 0 on a Falcon! */
|
|
host->sg_tablesize =
|
|
!IS_A_TT() ? ATARI_FALCON_SG_TABLESIZE :
|
|
(setup_sg_tablesize >= 0) ? setup_sg_tablesize : ATARI_TT_SG_TABLESIZE;
|
|
|
|
if (setup_hostid >= 0)
|
|
host->this_id = setup_hostid;
|
|
else {
|
|
/* use 7 as default */
|
|
host->this_id = 7;
|
|
/* Test if a host id is set in the NVRam */
|
|
if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) {
|
|
unsigned char b = nvram_read_byte( 14 );
|
|
/* Arbitration enabled? (for TOS) If yes, use configured host ID */
|
|
if (b & 0x80)
|
|
host->this_id = b & 7;
|
|
}
|
|
}
|
|
|
|
#ifdef SUPPORT_TAGS
|
|
if (setup_use_tagged_queuing < 0)
|
|
setup_use_tagged_queuing = DEFAULT_USE_TAGGED_QUEUING;
|
|
#endif
|
|
#ifdef REAL_DMA
|
|
/* If running on a Falcon and if there's TT-Ram (i.e., more than one
|
|
* memory block, since there's always ST-Ram in a Falcon), then allocate a
|
|
* STRAM_BUFFER_SIZE byte dribble buffer for transfers from/to alternative
|
|
* Ram.
|
|
*/
|
|
if (MACH_IS_ATARI && ATARIHW_PRESENT(ST_SCSI) &&
|
|
!ATARIHW_PRESENT(EXTD_DMA) && m68k_num_memory > 1) {
|
|
atari_dma_buffer = atari_stram_alloc(STRAM_BUFFER_SIZE, "SCSI");
|
|
if (!atari_dma_buffer) {
|
|
printk(KERN_ERR "atari_scsi_detect: can't allocate ST-RAM "
|
|
"double buffer\n");
|
|
return 0;
|
|
}
|
|
atari_dma_phys_buffer = virt_to_phys(atari_dma_buffer);
|
|
atari_dma_orig_addr = 0;
|
|
}
|
|
#endif
|
|
instance = scsi_register(host, sizeof(struct NCR5380_hostdata));
|
|
if (instance == NULL) {
|
|
atari_stram_free(atari_dma_buffer);
|
|
atari_dma_buffer = 0;
|
|
return 0;
|
|
}
|
|
atari_scsi_host = instance;
|
|
/*
|
|
* Set irq to 0, to avoid that the mid-level code disables our interrupt
|
|
* during queue_command calls. This is completely unnecessary, and even
|
|
* worse causes bad problems on the Falcon, where the int is shared with
|
|
* IDE and floppy!
|
|
*/
|
|
instance->irq = 0;
|
|
|
|
#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
|
|
atari_scsi_reset_boot();
|
|
#endif
|
|
NCR5380_init(instance, 0);
|
|
|
|
if (IS_A_TT()) {
|
|
|
|
/* This int is actually "pseudo-slow", i.e. it acts like a slow
|
|
* interrupt after having cleared the pending flag for the DMA
|
|
* interrupt. */
|
|
if (request_irq(IRQ_TT_MFP_SCSI, scsi_tt_intr, IRQ_TYPE_SLOW,
|
|
"SCSI NCR5380", instance)) {
|
|
printk(KERN_ERR "atari_scsi_detect: cannot allocate irq %d, aborting",IRQ_TT_MFP_SCSI);
|
|
scsi_unregister(atari_scsi_host);
|
|
atari_stram_free(atari_dma_buffer);
|
|
atari_dma_buffer = 0;
|
|
return 0;
|
|
}
|
|
tt_mfp.active_edge |= 0x80; /* SCSI int on L->H */
|
|
#ifdef REAL_DMA
|
|
tt_scsi_dma.dma_ctrl = 0;
|
|
atari_dma_residual = 0;
|
|
|
|
if (MACH_IS_MEDUSA) {
|
|
/* While the read overruns (described by Drew Eckhardt in
|
|
* NCR5380.c) never happened on TTs, they do in fact on the Medusa
|
|
* (This was the cause why SCSI didn't work right for so long
|
|
* there.) Since handling the overruns slows down a bit, I turned
|
|
* the #ifdef's into a runtime condition.
|
|
*
|
|
* In principle it should be sufficient to do max. 1 byte with
|
|
* PIO, but there is another problem on the Medusa with the DMA
|
|
* rest data register. So 'atari_read_overruns' is currently set
|
|
* to 4 to avoid having transfers that aren't a multiple of 4. If
|
|
* the rest data bug is fixed, this can be lowered to 1.
|
|
*/
|
|
atari_read_overruns = 4;
|
|
}
|
|
#endif /*REAL_DMA*/
|
|
} else { /* ! IS_A_TT */
|
|
|
|
/* Nothing to do for the interrupt: the ST-DMA is initialized
|
|
* already by atari_init_INTS()
|
|
*/
|
|
|
|
#ifdef REAL_DMA
|
|
atari_dma_residual = 0;
|
|
atari_dma_active = 0;
|
|
atari_dma_stram_mask = (ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000
|
|
: 0xff000000);
|
|
#endif
|
|
}
|
|
|
|
printk(KERN_INFO "scsi%d: options CAN_QUEUE=%d CMD_PER_LUN=%d SCAT-GAT=%d "
|
|
#ifdef SUPPORT_TAGS
|
|
"TAGGED-QUEUING=%s "
|
|
#endif
|
|
"HOSTID=%d",
|
|
instance->host_no, instance->hostt->can_queue,
|
|
instance->hostt->cmd_per_lun,
|
|
instance->hostt->sg_tablesize,
|
|
#ifdef SUPPORT_TAGS
|
|
setup_use_tagged_queuing ? "yes" : "no",
|
|
#endif
|
|
instance->hostt->this_id );
|
|
NCR5380_print_options(instance);
|
|
printk("\n");
|
|
|
|
called = 1;
|
|
return 1;
|
|
}
|
|
|
|
static int atari_scsi_release(struct Scsi_Host *sh)
|
|
{
|
|
if (IS_A_TT())
|
|
free_irq(IRQ_TT_MFP_SCSI, sh);
|
|
if (atari_dma_buffer)
|
|
atari_stram_free(atari_dma_buffer);
|
|
NCR5380_exit(sh);
|
|
return 1;
|
|
}
|
|
|
|
#ifndef MODULE
|
|
static int __init atari_scsi_setup(char *str)
|
|
{
|
|
/* Format of atascsi parameter is:
|
|
* atascsi=<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
|
|
* Defaults depend on TT or Falcon, hostid determined at run time.
|
|
* Negative values mean don't change.
|
|
*/
|
|
int ints[6];
|
|
|
|
get_options(str, ARRAY_SIZE(ints), ints);
|
|
|
|
if (ints[0] < 1) {
|
|
printk("atari_scsi_setup: no arguments!\n");
|
|
return 0;
|
|
}
|
|
|
|
if (ints[0] >= 1) {
|
|
if (ints[1] > 0)
|
|
/* no limits on this, just > 0 */
|
|
setup_can_queue = ints[1];
|
|
}
|
|
if (ints[0] >= 2) {
|
|
if (ints[2] > 0)
|
|
setup_cmd_per_lun = ints[2];
|
|
}
|
|
if (ints[0] >= 3) {
|
|
if (ints[3] >= 0) {
|
|
setup_sg_tablesize = ints[3];
|
|
/* Must be <= SG_ALL (255) */
|
|
if (setup_sg_tablesize > SG_ALL)
|
|
setup_sg_tablesize = SG_ALL;
|
|
}
|
|
}
|
|
if (ints[0] >= 4) {
|
|
/* Must be between 0 and 7 */
|
|
if (ints[4] >= 0 && ints[4] <= 7)
|
|
setup_hostid = ints[4];
|
|
else if (ints[4] > 7)
|
|
printk("atari_scsi_setup: invalid host ID %d !\n", ints[4]);
|
|
}
|
|
#ifdef SUPPORT_TAGS
|
|
if (ints[0] >= 5) {
|
|
if (ints[5] >= 0)
|
|
setup_use_tagged_queuing = !!ints[5];
|
|
}
|
|
#endif
|
|
|
|
return 1;
|
|
}
|
|
|
|
__setup("atascsi=", atari_scsi_setup);
|
|
#endif /* !MODULE */
|
|
|
|
static int atari_scsi_bus_reset(Scsi_Cmnd *cmd)
|
|
{
|
|
int rv;
|
|
struct NCR5380_hostdata *hostdata =
|
|
(struct NCR5380_hostdata *)cmd->device->host->hostdata;
|
|
|
|
/* For doing the reset, SCSI interrupts must be disabled first,
|
|
* since the 5380 raises its IRQ line while _RST is active and we
|
|
* can't disable interrupts completely, since we need the timer.
|
|
*/
|
|
/* And abort a maybe active DMA transfer */
|
|
if (IS_A_TT()) {
|
|
atari_turnoff_irq(IRQ_TT_MFP_SCSI);
|
|
#ifdef REAL_DMA
|
|
tt_scsi_dma.dma_ctrl = 0;
|
|
#endif /* REAL_DMA */
|
|
} else {
|
|
atari_turnoff_irq(IRQ_MFP_FSCSI);
|
|
#ifdef REAL_DMA
|
|
st_dma.dma_mode_status = 0x90;
|
|
atari_dma_active = 0;
|
|
atari_dma_orig_addr = NULL;
|
|
#endif /* REAL_DMA */
|
|
}
|
|
|
|
rv = NCR5380_bus_reset(cmd);
|
|
|
|
/* Re-enable ints */
|
|
if (IS_A_TT()) {
|
|
atari_turnon_irq(IRQ_TT_MFP_SCSI);
|
|
} else {
|
|
atari_turnon_irq(IRQ_MFP_FSCSI);
|
|
}
|
|
if ((rv & SCSI_RESET_ACTION) == SCSI_RESET_SUCCESS)
|
|
falcon_release_lock_if_possible(hostdata);
|
|
|
|
return rv;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
|
|
static void __init atari_scsi_reset_boot(void)
|
|
{
|
|
unsigned long end;
|
|
|
|
/*
|
|
* Do a SCSI reset to clean up the bus during initialization. No messing
|
|
* with the queues, interrupts, or locks necessary here.
|
|
*/
|
|
|
|
printk("Atari SCSI: resetting the SCSI bus...");
|
|
|
|
/* get in phase */
|
|
NCR5380_write(TARGET_COMMAND_REG,
|
|
PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG)));
|
|
|
|
/* assert RST */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
|
|
/* The min. reset hold time is 25us, so 40us should be enough */
|
|
udelay(50);
|
|
/* reset RST and interrupt */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
|
|
end = jiffies + AFTER_RESET_DELAY;
|
|
while (time_before(jiffies, end))
|
|
barrier();
|
|
|
|
printk(" done\n");
|
|
}
|
|
#endif
|
|
|
|
|
|
static const char *atari_scsi_info(struct Scsi_Host *host)
|
|
{
|
|
/* atari_scsi_detect() is verbose enough... */
|
|
static const char string[] = "Atari native SCSI";
|
|
return string;
|
|
}
|
|
|
|
|
|
#if defined(REAL_DMA)
|
|
|
|
static unsigned long atari_scsi_dma_setup(struct Scsi_Host *instance,
|
|
void *data, unsigned long count,
|
|
int dir)
|
|
{
|
|
unsigned long addr = virt_to_phys(data);
|
|
|
|
DMA_PRINTK("scsi%d: setting up dma, data = %p, phys = %lx, count = %ld, "
|
|
"dir = %d\n", instance->host_no, data, addr, count, dir);
|
|
|
|
if (!IS_A_TT() && !STRAM_ADDR(addr)) {
|
|
/* If we have a non-DMAable address on a Falcon, use the dribble
|
|
* buffer; 'orig_addr' != 0 in the read case tells the interrupt
|
|
* handler to copy data from the dribble buffer to the originally
|
|
* wanted address.
|
|
*/
|
|
if (dir)
|
|
memcpy(atari_dma_buffer, data, count);
|
|
else
|
|
atari_dma_orig_addr = data;
|
|
addr = atari_dma_phys_buffer;
|
|
}
|
|
|
|
atari_dma_startaddr = addr; /* Needed for calculating residual later. */
|
|
|
|
/* Cache cleanup stuff: On writes, push any dirty cache out before sending
|
|
* it to the peripheral. (Must be done before DMA setup, since at least
|
|
* the ST-DMA begins to fill internal buffers right after setup. For
|
|
* reads, invalidate any cache, may be altered after DMA without CPU
|
|
* knowledge.
|
|
*
|
|
* ++roman: For the Medusa, there's no need at all for that cache stuff,
|
|
* because the hardware does bus snooping (fine!).
|
|
*/
|
|
dma_cache_maintenance(addr, count, dir);
|
|
|
|
if (count == 0)
|
|
printk(KERN_NOTICE "SCSI warning: DMA programmed for 0 bytes !\n");
|
|
|
|
if (IS_A_TT()) {
|
|
tt_scsi_dma.dma_ctrl = dir;
|
|
SCSI_DMA_WRITE_P(dma_addr, addr);
|
|
SCSI_DMA_WRITE_P(dma_cnt, count);
|
|
tt_scsi_dma.dma_ctrl = dir | 2;
|
|
} else { /* ! IS_A_TT */
|
|
|
|
/* set address */
|
|
SCSI_DMA_SETADR(addr);
|
|
|
|
/* toggle direction bit to clear FIFO and set DMA direction */
|
|
dir <<= 8;
|
|
st_dma.dma_mode_status = 0x90 | dir;
|
|
st_dma.dma_mode_status = 0x90 | (dir ^ 0x100);
|
|
st_dma.dma_mode_status = 0x90 | dir;
|
|
udelay(40);
|
|
/* On writes, round up the transfer length to the next multiple of 512
|
|
* (see also comment at atari_dma_xfer_len()). */
|
|
st_dma.fdc_acces_seccount = (count + (dir ? 511 : 0)) >> 9;
|
|
udelay(40);
|
|
st_dma.dma_mode_status = 0x10 | dir;
|
|
udelay(40);
|
|
/* need not restore value of dir, only boolean value is tested */
|
|
atari_dma_active = 1;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
|
|
static long atari_scsi_dma_residual(struct Scsi_Host *instance)
|
|
{
|
|
return atari_dma_residual;
|
|
}
|
|
|
|
|
|
#define CMD_SURELY_BLOCK_MODE 0
|
|
#define CMD_SURELY_BYTE_MODE 1
|
|
#define CMD_MODE_UNKNOWN 2
|
|
|
|
static int falcon_classify_cmd(Scsi_Cmnd *cmd)
|
|
{
|
|
unsigned char opcode = cmd->cmnd[0];
|
|
|
|
if (opcode == READ_DEFECT_DATA || opcode == READ_LONG ||
|
|
opcode == READ_BUFFER)
|
|
return CMD_SURELY_BYTE_MODE;
|
|
else if (opcode == READ_6 || opcode == READ_10 ||
|
|
opcode == 0xa8 /* READ_12 */ || opcode == READ_REVERSE ||
|
|
opcode == RECOVER_BUFFERED_DATA) {
|
|
/* In case of a sequential-access target (tape), special care is
|
|
* needed here: The transfer is block-mode only if the 'fixed' bit is
|
|
* set! */
|
|
if (cmd->device->type == TYPE_TAPE && !(cmd->cmnd[1] & 1))
|
|
return CMD_SURELY_BYTE_MODE;
|
|
else
|
|
return CMD_SURELY_BLOCK_MODE;
|
|
} else
|
|
return CMD_MODE_UNKNOWN;
|
|
}
|
|
|
|
|
|
/* This function calculates the number of bytes that can be transferred via
|
|
* DMA. On the TT, this is arbitrary, but on the Falcon we have to use the
|
|
* ST-DMA chip. There are only multiples of 512 bytes possible and max.
|
|
* 255*512 bytes :-( This means also, that defining READ_OVERRUNS is not
|
|
* possible on the Falcon, since that would require to program the DMA for
|
|
* n*512 - atari_read_overrun bytes. But it seems that the Falcon doesn't have
|
|
* the overrun problem, so this question is academic :-)
|
|
*/
|
|
|
|
static unsigned long atari_dma_xfer_len(unsigned long wanted_len,
|
|
Scsi_Cmnd *cmd, int write_flag)
|
|
{
|
|
unsigned long possible_len, limit;
|
|
|
|
if (IS_A_TT())
|
|
/* TT SCSI DMA can transfer arbitrary #bytes */
|
|
return wanted_len;
|
|
|
|
/* ST DMA chip is stupid -- only multiples of 512 bytes! (and max.
|
|
* 255*512 bytes, but this should be enough)
|
|
*
|
|
* ++roman: Aaargl! Another Falcon-SCSI problem... There are some commands
|
|
* that return a number of bytes which cannot be known beforehand. In this
|
|
* case, the given transfer length is an "allocation length". Now it
|
|
* can happen that this allocation length is a multiple of 512 bytes and
|
|
* the DMA is used. But if not n*512 bytes really arrive, some input data
|
|
* will be lost in the ST-DMA's FIFO :-( Thus, we have to distinguish
|
|
* between commands that do block transfers and those that do byte
|
|
* transfers. But this isn't easy... there are lots of vendor specific
|
|
* commands, and the user can issue any command via the
|
|
* SCSI_IOCTL_SEND_COMMAND.
|
|
*
|
|
* The solution: We classify SCSI commands in 1) surely block-mode cmd.s,
|
|
* 2) surely byte-mode cmd.s and 3) cmd.s with unknown mode. In case 1)
|
|
* and 3), the thing to do is obvious: allow any number of blocks via DMA
|
|
* or none. In case 2), we apply some heuristic: Byte mode is assumed if
|
|
* the transfer (allocation) length is < 1024, hoping that no cmd. not
|
|
* explicitly known as byte mode have such big allocation lengths...
|
|
* BTW, all the discussion above applies only to reads. DMA writes are
|
|
* unproblematic anyways, since the targets aborts the transfer after
|
|
* receiving a sufficient number of bytes.
|
|
*
|
|
* Another point: If the transfer is from/to an non-ST-RAM address, we
|
|
* use the dribble buffer and thus can do only STRAM_BUFFER_SIZE bytes.
|
|
*/
|
|
|
|
if (write_flag) {
|
|
/* Write operation can always use the DMA, but the transfer size must
|
|
* be rounded up to the next multiple of 512 (atari_dma_setup() does
|
|
* this).
|
|
*/
|
|
possible_len = wanted_len;
|
|
} else {
|
|
/* Read operations: if the wanted transfer length is not a multiple of
|
|
* 512, we cannot use DMA, since the ST-DMA cannot split transfers
|
|
* (no interrupt on DMA finished!)
|
|
*/
|
|
if (wanted_len & 0x1ff)
|
|
possible_len = 0;
|
|
else {
|
|
/* Now classify the command (see above) and decide whether it is
|
|
* allowed to do DMA at all */
|
|
switch (falcon_classify_cmd(cmd)) {
|
|
case CMD_SURELY_BLOCK_MODE:
|
|
possible_len = wanted_len;
|
|
break;
|
|
case CMD_SURELY_BYTE_MODE:
|
|
possible_len = 0; /* DMA prohibited */
|
|
break;
|
|
case CMD_MODE_UNKNOWN:
|
|
default:
|
|
/* For unknown commands assume block transfers if the transfer
|
|
* size/allocation length is >= 1024 */
|
|
possible_len = (wanted_len < 1024) ? 0 : wanted_len;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Last step: apply the hard limit on DMA transfers */
|
|
limit = (atari_dma_buffer && !STRAM_ADDR(virt_to_phys(cmd->SCp.ptr))) ?
|
|
STRAM_BUFFER_SIZE : 255*512;
|
|
if (possible_len > limit)
|
|
possible_len = limit;
|
|
|
|
if (possible_len != wanted_len)
|
|
DMA_PRINTK("Sorry, must cut DMA transfer size to %ld bytes "
|
|
"instead of %ld\n", possible_len, wanted_len);
|
|
|
|
return possible_len;
|
|
}
|
|
|
|
|
|
#endif /* REAL_DMA */
|
|
|
|
|
|
/* NCR5380 register access functions
|
|
*
|
|
* There are separate functions for TT and Falcon, because the access
|
|
* methods are quite different. The calling macros NCR5380_read and
|
|
* NCR5380_write call these functions via function pointers.
|
|
*/
|
|
|
|
static unsigned char atari_scsi_tt_reg_read(unsigned char reg)
|
|
{
|
|
return tt_scsi_regp[reg * 2];
|
|
}
|
|
|
|
static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value)
|
|
{
|
|
tt_scsi_regp[reg * 2] = value;
|
|
}
|
|
|
|
static unsigned char atari_scsi_falcon_reg_read(unsigned char reg)
|
|
{
|
|
dma_wd.dma_mode_status= (u_short)(0x88 + reg);
|
|
return (u_char)dma_wd.fdc_acces_seccount;
|
|
}
|
|
|
|
static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value)
|
|
{
|
|
dma_wd.dma_mode_status = (u_short)(0x88 + reg);
|
|
dma_wd.fdc_acces_seccount = (u_short)value;
|
|
}
|
|
|
|
|
|
#include "atari_NCR5380.c"
|
|
|
|
static struct scsi_host_template driver_template = {
|
|
.show_info = atari_scsi_show_info,
|
|
.name = "Atari native SCSI",
|
|
.detect = atari_scsi_detect,
|
|
.release = atari_scsi_release,
|
|
.info = atari_scsi_info,
|
|
.queuecommand = atari_scsi_queue_command,
|
|
.eh_abort_handler = atari_scsi_abort,
|
|
.eh_bus_reset_handler = atari_scsi_bus_reset,
|
|
.can_queue = 0, /* initialized at run-time */
|
|
.this_id = 0, /* initialized at run-time */
|
|
.sg_tablesize = 0, /* initialized at run-time */
|
|
.cmd_per_lun = 0, /* initialized at run-time */
|
|
.use_clustering = DISABLE_CLUSTERING
|
|
};
|
|
|
|
|
|
#include "scsi_module.c"
|
|
|
|
MODULE_LICENSE("GPL");
|