patch-1.3.94 linux/drivers/scsi/a2091.c

• Lines: 230
• Date: Mon Apr 1 22:13:57 1996
• Orig file: v1.3.93/linux/drivers/scsi/a2091.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/drivers/scsi/a2091.c linux/drivers/scsi/a2091.c
@@ -0,0 +1,229 @@
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/blk.h>
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/bootinfo.h>
+#include <asm/amigaints.h>
+#include <asm/amigahw.h>
+#include <asm/zorro.h>
+#include <asm/irq.h>
+
+#include "scsi.h"
+#include "hosts.h"
+#include "wd33c93.h"
+#include "a2091.h"
+
+#include<linux/stat.h>
+
+struct proc_dir_entry proc_scsi_a2091 = {
+    PROC_SCSI_A2091, 5, "A2091",
+    S_IFDIR | S_IRUGO | S_IXUGO, 2
+};
+
+#define DMA(ptr) ((a2091_scsiregs *)((ptr)->base))
+#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
+
+static struct Scsi_Host *first_instance = NULL;
+static Scsi_Host_Template *a2091_template;
+
+static void a2091_intr (int irq, struct pt_regs *fp, void *dummy)
+{
+    unsigned int status;
+    struct Scsi_Host *instance;
+
+    for (instance = first_instance; instance &&
+	 instance->hostt == a2091_template; instance = instance->next)
+    {
+	status = DMA(instance)->ISTR;
+	if (!(status & (ISTR_INT_F|ISTR_INT_P)))
+	    continue;
+
+	if (status & ISTR_INTS)
+	{
+	    /* disable PORTS interrupt */
+	    custom.intena = IF_PORTS;
+	    wd33c93_intr (instance);
+	    /* enable PORTS interrupt */
+	    custom.intena = IF_SETCLR | IF_PORTS;
+	}
+    }
+}
+
+static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
+{
+    unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
+    unsigned long addr = VTOP(cmd->SCp.ptr);
+    struct Scsi_Host *instance = cmd->host;
+
+    /* don't allow DMA if the physical address is bad */
+    if (addr & A2091_XFER_MASK ||
+	(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
+    {
+	HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511)
+	    & ~0x1ff;
+	HDATA(instance)->dma_bounce_buffer =
+	    scsi_malloc (HDATA(instance)->dma_bounce_len);
+	
+	/* can't allocate memory; use PIO */
+	if (!HDATA(instance)->dma_bounce_buffer) {
+	    HDATA(instance)->dma_bounce_len = 0;
+	    return 1;
+	}
+
+	/* get the physical address of the bounce buffer */
+	addr = VTOP(HDATA(instance)->dma_bounce_buffer);
+
+	/* the bounce buffer may not be in the first 16M of physmem */
+	if (addr & A2091_XFER_MASK) {
+	    /* we could use chipmem... maybe later */
+	    scsi_free (HDATA(instance)->dma_bounce_buffer,
+		       HDATA(instance)->dma_bounce_len);
+	    HDATA(instance)->dma_bounce_buffer = NULL;
+	    HDATA(instance)->dma_bounce_len = 0;
+	    return 1;
+	}
+
+	if (!dir_in) {
+	    /* copy to bounce buffer for a write */
+	    if (cmd->use_sg)
+#if 0
+		panic ("scsi%ddma: incomplete s/g support",
+		       instance->host_no);
+#else
+		memcpy (HDATA(instance)->dma_bounce_buffer,
+			cmd->SCp.ptr, cmd->SCp.this_residual);
+#endif
+	    else
+		memcpy (HDATA(instance)->dma_bounce_buffer,
+			cmd->request_buffer, cmd->request_bufflen);
+	}
+    }
+
+    /* setup dma direction */
+    if (!dir_in)
+	cntr |= CNTR_DDIR;
+
+    /* remember direction */
+    HDATA(cmd->host)->dma_dir = dir_in;
+
+    DMA(cmd->host)->CNTR = cntr;
+
+    /* setup DMA *physical* address */
+    DMA(cmd->host)->ACR = addr;
+
+    if (dir_in){
+	/* invalidate any cache */
+	cache_clear (addr, cmd->SCp.this_residual);
+    }else{
+	/* push any dirty cache */
+	cache_push (addr, cmd->SCp.this_residual);
+      }
+    /* start DMA */
+    DMA(cmd->host)->ST_DMA = 1;
+
+    /* return success */
+    return 0;
+}
+
+static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt, 
+		      int status)
+{
+    /* disable SCSI interrupts */
+    unsigned short cntr = CNTR_PDMD;
+
+    if (!HDATA(instance)->dma_dir)
+	    cntr |= CNTR_DDIR;
+
+    /* disable SCSI interrupts */
+    DMA(instance)->CNTR = cntr;
+
+    /* flush if we were reading */
+    if (HDATA(instance)->dma_dir) {
+	DMA(instance)->FLUSH = 1;
+	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
+	    ;
+    }
+
+    /* clear a possible interrupt */
+    DMA(instance)->CINT = 1;
+
+    /* stop DMA */
+    DMA(instance)->SP_DMA = 1;
+
+    /* restore the CONTROL bits (minus the direction flag) */
+    DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
+
+    /* copy from a bounce buffer, if necessary */
+    if (status && HDATA(instance)->dma_bounce_buffer) {
+	if (SCpnt && SCpnt->use_sg) {
+#if 0
+	    panic ("scsi%d: incomplete s/g support",
+		   instance->host_no);
+#else
+	    if( HDATA(instance)->dma_dir )
+		memcpy (SCpnt->SCp.ptr, 
+			HDATA(instance)->dma_bounce_buffer,
+			SCpnt->SCp.this_residual);
+	    scsi_free (HDATA(instance)->dma_bounce_buffer,
+		       HDATA(instance)->dma_bounce_len);
+	    HDATA(instance)->dma_bounce_buffer = NULL;
+	    HDATA(instance)->dma_bounce_len = 0;
+	    
+#endif
+	} else {
+	    if (HDATA(instance)->dma_dir && SCpnt)
+		memcpy (SCpnt->request_buffer,
+			HDATA(instance)->dma_bounce_buffer,
+			SCpnt->request_bufflen);
+
+	    scsi_free (HDATA(instance)->dma_bounce_buffer,
+		       HDATA(instance)->dma_bounce_len);
+	    HDATA(instance)->dma_bounce_buffer = NULL;
+	    HDATA(instance)->dma_bounce_len = 0;
+	}
+    }
+}
+
+int a2091_detect(Scsi_Host_Template *tpnt)
+{
+    static unsigned char called = 0;
+    struct Scsi_Host *instance;
+    int i, manuf, product, num_a2091 = 0;
+    caddr_t address;
+
+    if (!MACH_IS_AMIGA || called)
+	return 0;
+    called = 1;
+
+    tpnt->proc_dir = &proc_scsi_a2091;
+
+    for (i = 0; i < boot_info.bi_amiga.num_autocon; i++)
+    {
+	manuf = boot_info.bi_amiga.autocon[i].cd_Rom.er_Manufacturer;
+	product = boot_info.bi_amiga.autocon[i].cd_Rom.er_Product;
+	if (manuf == MANUF_COMMODORE && (product == PROD_A2091 ||
+					 product == PROD_A590)) {
+	    address = boot_info.bi_amiga.autocon[i].cd_BoardAddr;
+	    instance = scsi_register (tpnt,
+				      sizeof (struct WD33C93_hostdata));
+	    instance->base = (unsigned char *)ZTWO_VADDR(address);
+	    DMA(instance)->DAWR = DAWR_A2091;
+	    wd33c93_init(instance, (wd33c93_regs *)&(DMA(instance)->SASR),
+			 dma_setup, dma_stop, WD33C93_FS_8_10);
+	    if (num_a2091++ == 0) {
+		first_instance = instance;
+		a2091_template = instance->hostt;
+		add_isr(IRQ_AMIGA_PORTS, a2091_intr, 0, NULL, "A2091 SCSI");
+	    }
+	    DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
+
+#if 0 /* The Zorro stuff is not totally integrated yet ! */
+	    boot_info.bi_amiga.autocon_configured |= 1<<i;
+#endif
+	  }
+    }
+
+    return num_a2091;
+}