m68k: Remove the broken Hades support

This patch removes the Hades support that was marked as BROKEN 5 years ago.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 3 insertions, 500 deletions

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index d3b211af4e1..96033ecb675 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -1670,14 +1670,6 @@ config ATARI_SCSI_RESET_BOOT
 	  boot process fractionally longer but may assist recovery from errors
 	  that leave the devices with SCSI operations partway completed.
 
-config TT_DMA_EMUL
-	bool "Hades SCSI DMA emulator"
-	depends on ATARI_SCSI && HADES
-	help
-	  This option enables code which emulates the TT SCSI DMA chip on the
-	  Hades. This increases the SCSI transfer rates at least ten times
-	  compared to PIO transfers.
-
 config MAC_SCSI
 	bool "Macintosh NCR5380 SCSI"
 	depends on MAC && SCSI=y
diff --git a/drivers/scsi/atari_dma_emul.c b/drivers/scsi/atari_dma_emul.c
deleted file mode 100644
index cdc710ea00f..00000000000
--- a/drivers/scsi/atari_dma_emul.c
+++ /dev/null
@@ -1,468 +0,0 @@
-/*
- * atari_dma_emul.c -- TT SCSI DMA emulator for the Hades.
- *
- * Copyright 1997 Wout Klaren <W.Klaren@inter.nl.net>
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file COPYING in the main directory of this archive
- * for more details.
- *
- * This code was written using the Hades TOS source code as a
- * reference. This source code can be found on the home page
- * of Medusa Computer Systems.
- *
- * Version 0.1, 1997-09-24.
- * 
- * This code should be considered experimental. It has only been
- * tested on a Hades with a 68060. It might not work on a Hades
- * with a 68040. Make backups of your hard drives before using
- * this code.
- */
-
-#include <linux/compiler.h>
-#include <asm/thread_info.h>
-#include <asm/uaccess.h>
-
-#define hades_dma_ctrl		(*(unsigned char *) 0xffff8717)
-#define hades_psdm_reg		(*(unsigned char *) 0xffff8741)
-
-#define TRANSFER_SIZE		16
-
-struct m68040_frame {
-	unsigned long  effaddr;  /* effective address */
-	unsigned short ssw;      /* special status word */
-	unsigned short wb3s;     /* write back 3 status */
-	unsigned short wb2s;     /* write back 2 status */
-	unsigned short wb1s;     /* write back 1 status */
-	unsigned long  faddr;    /* fault address */
-	unsigned long  wb3a;     /* write back 3 address */
-	unsigned long  wb3d;     /* write back 3 data */
-	unsigned long  wb2a;     /* write back 2 address */
-	unsigned long  wb2d;     /* write back 2 data */
-	unsigned long  wb1a;     /* write back 1 address */
-	unsigned long  wb1dpd0;  /* write back 1 data/push data 0*/
-	unsigned long  pd1;      /* push data 1*/
-	unsigned long  pd2;      /* push data 2*/
-	unsigned long  pd3;      /* push data 3*/
-};
-
-static void writeback (unsigned short wbs, unsigned long wba,
-		       unsigned long wbd, void *old_buserr)
-{
-	mm_segment_t fs = get_fs();
-	static void *save_buserr;
-
-	__asm__ __volatile__ ("movec.l	%%vbr,%%a0\n\t"
-			      "move.l	%0,8(%%a0)\n\t"
-			      :
-			      : "r" (&&bus_error)
-			      : "a0" );
-
-	save_buserr = old_buserr;
-
-	set_fs (MAKE_MM_SEG(wbs & WBTM_040));
-
-	switch (wbs & WBSIZ_040) {
-	    case BA_SIZE_BYTE:
-		put_user (wbd & 0xff, (char *)wba);
-		break;
-	    case BA_SIZE_WORD:
-		put_user (wbd & 0xffff, (short *)wba);
-		break;
-	    case BA_SIZE_LONG:
-		put_user (wbd, (int *)wba);
-		break;
-	}
-
-	set_fs (fs);
-	return;
-
-bus_error:
-	__asm__ __volatile__ ("cmp.l	%0,2(%%sp)\n\t"
-			      "bcs.s	.jump_old\n\t"
-			      "cmp.l	%1,2(%%sp)\n\t"
-			      "bls.s	.restore_old\n"
-			".jump_old:\n\t"
-			      "move.l	%2,-(%%sp)\n\t"
-			      "rts\n"
-			".restore_old:\n\t"
-			      "move.l	%%a0,-(%%sp)\n\t"
-			      "movec.l	%%vbr,%%a0\n\t"
-			      "move.l	%2,8(%%a0)\n\t"
-			      "move.l	(%%sp)+,%%a0\n\t"
-			      "rte\n\t"
-			      :
-			      : "i" (writeback), "i" (&&bus_error),
-			        "m" (save_buserr) );
-}
-
-/*
- * static inline void set_restdata_reg(unsigned char *cur_addr)
- *
- * Set the rest data register if necessary.
- */
-
-static inline void set_restdata_reg(unsigned char *cur_addr)
-{
-	if (((long) cur_addr & ~3) != 0)
-		tt_scsi_dma.dma_restdata =
-			*((unsigned long *) ((long) cur_addr & ~3));
-}
-
-/*
- * void hades_dma_emulator(int irq, void *dummy)
- * 
- * This code emulates TT SCSI DMA on the Hades.
- * 
- * Note the following:
- * 
- * 1. When there is no byte available to read from the SCSI bus, or
- *    when a byte cannot yet bet written to the SCSI bus, a bus
- *    error occurs when reading or writing the pseudo DMA data
- *    register (hades_psdm_reg). We have to catch this bus error
- *    and try again to read or write the byte. If after several tries
- *    we still get a bus error, the interrupt handler is left. When
- *    the byte can be read or written, the interrupt handler is
- *    called again.
- * 
- * 2. The SCSI interrupt must be disabled in this interrupt handler.
- * 
- * 3. If we set the EOP signal, the SCSI controller still expects one
- *    byte to be read or written. Therefore the last byte is transferred
- *    separately, after setting the EOP signal.
- * 
- * 4. When this function is left, the address pointer (start_addr) is
- *    converted to a physical address. Because it points one byte
- *    further than the last transferred byte, it can point outside the
- *    current page. If virt_to_phys() is called with this address we
- *    might get an access error. Therefore virt_to_phys() is called with
- *    start_addr - 1 if the count has reached zero. The result is
- *    increased with one.
- */
-
-static irqreturn_t hades_dma_emulator(int irq, void *dummy)
-{
-	unsigned long dma_base;
-	register unsigned long dma_cnt asm ("d3");
-	static long save_buserr;
-	register unsigned long save_sp asm ("d4");
-	register int tries asm ("d5");
-	register unsigned char *start_addr asm ("a3"), *end_addr asm ("a4");
-	register unsigned char *eff_addr;
-	register unsigned char *psdm_reg;
-	unsigned long rem;
-
-	atari_disable_irq(IRQ_TT_MFP_SCSI);
-
-	/*
-	 * Read the dma address and count registers.
-	 */
-
-	dma_base = SCSI_DMA_READ_P(dma_addr);
-	dma_cnt = SCSI_DMA_READ_P(dma_cnt);
-
-	/*
-	 * Check if DMA is still enabled.
-	 */
-
-	if ((tt_scsi_dma.dma_ctrl & 2) == 0)
-	{
-		atari_enable_irq(IRQ_TT_MFP_SCSI);
-		return IRQ_HANDLED;
-	}
-
-	if (dma_cnt == 0)
-	{
-		printk(KERN_NOTICE "DMA emulation: count is zero.\n");
-		tt_scsi_dma.dma_ctrl &= 0xfd;	/* DMA ready. */
-		atari_enable_irq(IRQ_TT_MFP_SCSI);
-		return IRQ_HANDLED;
-	}
-
-	/*
-	 * Install new bus error routine.
-	 */
-
-	__asm__ __volatile__ ("movec.l	%%vbr,%%a0\n\t"
-			      "move.l	8(%%a0),%0\n\t"
-			      "move.l	%1,8(%%a0)\n\t"
-			      : "=&r" (save_buserr)
-			      : "r" (&&scsi_bus_error)
-			      : "a0" );
-
-	hades_dma_ctrl &= 0xfc;		/* Bus error and EOP off. */
-
-	/*
-	 * Save the stack pointer.
-	 */
-
-	__asm__ __volatile__ ("move.l	%%sp,%0\n\t"
-			      : "=&r" (save_sp) );
-
-	tries = 100;			/* Maximum number of bus errors. */
-	start_addr = phys_to_virt(dma_base);
-	end_addr = start_addr + dma_cnt;
-
-scsi_loop:
-	dma_cnt--;
-	rem = dma_cnt & (TRANSFER_SIZE - 1);
-	dma_cnt &= ~(TRANSFER_SIZE - 1);
-	psdm_reg = &hades_psdm_reg;
-
-	if (tt_scsi_dma.dma_ctrl & 1)	/* Read or write? */
-	{
-		/*
-		 * SCSI write. Abort when count is zero.
-		 */
-
-		switch (rem)
-		{
-		case 0:
-			while (dma_cnt > 0)
-			{
-				dma_cnt -= TRANSFER_SIZE;
-
-				*psdm_reg = *start_addr++;
-		case 15:
-				*psdm_reg = *start_addr++;
-		case 14:
-				*psdm_reg = *start_addr++;
-		case 13:
-				*psdm_reg = *start_addr++;
-		case 12:
-				*psdm_reg = *start_addr++;
-		case 11:
-				*psdm_reg = *start_addr++;
-		case 10:
-				*psdm_reg = *start_addr++;
-		case 9:
-				*psdm_reg = *start_addr++;
-		case 8:
-				*psdm_reg = *start_addr++;
-		case 7:
-				*psdm_reg = *start_addr++;
-		case 6:
-				*psdm_reg = *start_addr++;
-		case 5:
-				*psdm_reg = *start_addr++;
-		case 4:
-				*psdm_reg = *start_addr++;
-		case 3:
-				*psdm_reg = *start_addr++;
-		case 2:
-				*psdm_reg = *start_addr++;
-		case 1:
-				*psdm_reg = *start_addr++;
-			}
-		}
-
-		hades_dma_ctrl |= 1;	/* Set EOP. */
-		udelay(10);
-		*psdm_reg = *start_addr++;	/* Dummy byte. */
-		tt_scsi_dma.dma_ctrl &= 0xfd;	/* DMA ready. */
-	}
-	else
-	{
-		/*
-		 * SCSI read. Abort when count is zero.
-		 */
-
-		switch (rem)
-		{
-		case 0:
-			while (dma_cnt > 0)
-			{
-				dma_cnt -= TRANSFER_SIZE;
-
-				*start_addr++ = *psdm_reg;
-		case 15:
-				*start_addr++ = *psdm_reg;
-		case 14:
-				*start_addr++ = *psdm_reg;
-		case 13:
-				*start_addr++ = *psdm_reg;
-		case 12:
-				*start_addr++ = *psdm_reg;
-		case 11:
-				*start_addr++ = *psdm_reg;
-		case 10:
-				*start_addr++ = *psdm_reg;
-		case 9:
-				*start_addr++ = *psdm_reg;
-		case 8:
-				*start_addr++ = *psdm_reg;
-		case 7:
-				*start_addr++ = *psdm_reg;
-		case 6:
-				*start_addr++ = *psdm_reg;
-		case 5:
-				*start_addr++ = *psdm_reg;
-		case 4:
-				*start_addr++ = *psdm_reg;
-		case 3:
-				*start_addr++ = *psdm_reg;
-		case 2:
-				*start_addr++ = *psdm_reg;
-		case 1:
-				*start_addr++ = *psdm_reg;
-			}
-		}
-
-		hades_dma_ctrl |= 1;	/* Set EOP. */
-		udelay(10);
-		*start_addr++ = *psdm_reg;
-		tt_scsi_dma.dma_ctrl &= 0xfd;	/* DMA ready. */
-
-		set_restdata_reg(start_addr);
-	}
-
-	if (start_addr != end_addr)
-		printk(KERN_CRIT "DMA emulation: FATAL: Count is not zero at end of transfer.\n");
-
-	dma_cnt = end_addr - start_addr;
-
-scsi_end:
-	dma_base = (dma_cnt == 0) ? virt_to_phys(start_addr - 1) + 1 :  
-				    virt_to_phys(start_addr);
-
-	SCSI_DMA_WRITE_P(dma_addr, dma_base);
-	SCSI_DMA_WRITE_P(dma_cnt, dma_cnt);
-
-	/*
-	 * Restore old bus error routine.
-	 */
-
-	__asm__ __volatile__ ("movec.l	%%vbr,%%a0\n\t"
-			      "move.l	%0,8(%%a0)\n\t"
-			      :
-			      : "r" (save_buserr)
-			      : "a0" );
-
-	atari_enable_irq(IRQ_TT_MFP_SCSI);
-
-	return IRQ_HANDLED;
-
-scsi_bus_error:
-	/*
-	 * First check if the bus error is caused by our code.
-	 * If not, call the original handler.
-	 */
-
-	__asm__ __volatile__ ("cmp.l	%0,2(%%sp)\n\t"
-			      "bcs.s	.old_vector\n\t"
-			      "cmp.l	%1,2(%%sp)\n\t"
-			      "bls.s	.scsi_buserr\n"
-			".old_vector:\n\t"
-			      "move.l	%2,-(%%sp)\n\t"
-			      "rts\n"
-			".scsi_buserr:\n\t"
-			      :
-			      : "i" (&&scsi_loop), "i" (&&scsi_end),
-			        "m" (save_buserr) );
-
-	if (CPU_IS_060)
-	{
-		/*
-		 * Get effective address and restore the stack.
-		 */
-
-		__asm__ __volatile__ ("move.l	8(%%sp),%0\n\t"
-				      "move.l	%1,%%sp\n\t"
-				      : "=a&" (eff_addr)
-				      : "r" (save_sp) );
-	}
-	else
-	{
-		register struct m68040_frame *frame;
-
-		__asm__ __volatile__ ("lea	8(%%sp),%0\n\t"
-				      : "=a&" (frame) );
-
-		if (tt_scsi_dma.dma_ctrl & 1)
-		{
-			/*
-			 * Bus error while writing.
-			 */
-
-			if (frame->wb3s & WBV_040)
-			{
-				if (frame->wb3a == (long) &hades_psdm_reg)
-					start_addr--;
-				else
-					writeback(frame->wb3s, frame->wb3a,
-						  frame->wb3d, &&scsi_bus_error);
-			}
-
-			if (frame->wb2s & WBV_040)
-			{
-				if (frame->wb2a == (long) &hades_psdm_reg)
-					start_addr--;
-				else
-					writeback(frame->wb2s, frame->wb2a,
-						  frame->wb2d, &&scsi_bus_error);
-			}
-
-			if (frame->wb1s & WBV_040)
-			{
-				if (frame->wb1a == (long) &hades_psdm_reg)
-					start_addr--;
-			}
-		}
-		else
-		{
-			/*
-			 * Bus error while reading.
-			 */
-
-			if (frame->wb3s & WBV_040)
-				writeback(frame->wb3s, frame->wb3a,
-					  frame->wb3d, &&scsi_bus_error);
-		}
-
-		eff_addr = (unsigned char *) frame->faddr;
-
-		__asm__ __volatile__ ("move.l	%0,%%sp\n\t"
-				      :
-				      : "r" (save_sp) );
-	}
-
-	dma_cnt = end_addr - start_addr;
-
-	if (eff_addr == &hades_psdm_reg)
-	{
-		/*
-		 * Bus error occurred while reading the pseudo
-		 * DMA register. Time out.
-		 */
-
-		tries--;
-
-		if (tries <= 0)
-		{
-			if ((tt_scsi_dma.dma_ctrl & 1) == 0)	/* Read or write? */
-				set_restdata_reg(start_addr);
-
-			if (dma_cnt <= 1)
-				printk(KERN_CRIT "DMA emulation: Fatal "
-				       "error while %s the last byte.\n",
-				       (tt_scsi_dma.dma_ctrl & 1)
-				       ? "writing" : "reading");
-
-			goto scsi_end;
-		}
-		else
-			goto scsi_loop;
-	}
-	else
-	{
-		/*
-		 * Bus error during pseudo DMA transfer.
-		 * Terminate the DMA transfer.
-		 */
-
-		hades_dma_ctrl |= 3;	/* Set EOP and bus error. */
-		if ((tt_scsi_dma.dma_ctrl & 1) == 0)	/* Read or write? */
-			set_restdata_reg(start_addr);
-		goto scsi_end;
-	}
-}
diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c
index f5732d8f67f..21fe07f9df8 100644
--- a/drivers/scsi/atari_scsi.c
+++ b/drivers/scsi/atari_scsi.c
@@ -249,10 +249,6 @@ static int setup_hostid = -1;
 module_param(setup_hostid, int, 0);
 
 
-#if defined(CONFIG_TT_DMA_EMUL)
-#include "atari_dma_emul.c"
-#endif
-
 #if defined(REAL_DMA)
 
 static int scsi_dma_is_ignored_buserr(unsigned char dma_stat)
@@ -695,21 +691,8 @@ int atari_scsi_detect(struct scsi_host_template *host)
 #ifdef REAL_DMA
 		tt_scsi_dma.dma_ctrl = 0;
 		atari_dma_residual = 0;
-#ifdef CONFIG_TT_DMA_EMUL
-		if (MACH_IS_HADES) {
-			if (request_irq(IRQ_AUTO_2, hades_dma_emulator,
-					 IRQ_TYPE_PRIO, "Hades DMA emulator",
-					 hades_dma_emulator)) {
-				printk(KERN_ERR "atari_scsi_detect: cannot allocate irq %d, aborting (MACH_IS_HADES)",IRQ_AUTO_2);
-				free_irq(IRQ_TT_MFP_SCSI, instance);
-				scsi_unregister(atari_scsi_host);
-				atari_stram_free(atari_dma_buffer);
-				atari_dma_buffer = 0;
-				return 0;
-			}
-		}
-#endif
-		if (MACH_IS_MEDUSA || MACH_IS_HADES) {
+
+		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
@@ -1007,11 +990,7 @@ static unsigned long atari_dma_xfer_len(unsigned long wanted_len,
 					Scsi_Cmnd *cmd, int write_flag)
 {
 	unsigned long	possible_len, limit;
-#ifndef CONFIG_TT_DMA_EMUL
-	if (MACH_IS_HADES)
-		/* Hades has no SCSI DMA at all :-( Always force use of PIO */
-		return 0;
-#endif
+
 	if (IS_A_TT())
 		/* TT SCSI DMA can transfer arbitrary #bytes */
 		return wanted_len;