patch-1.3.93 linux/drivers/sbus/dvma.c

• Lines: 118
• Date: Sun Apr 21 17:32:02 1996
• Orig file: v1.3.92/linux/drivers/sbus/dvma.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.92/linux/drivers/sbus/dvma.c linux/drivers/sbus/dvma.c
@@ -0,0 +1,117 @@
+/* dvma.c:  Routines that are used to access DMA on the Sparc SBus.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <linux/kernel.h>
+#include <linux/malloc.h>
+
+#include <asm/oplib.h>
+#include <asm/contregs.h>
+#include <asm/sysen.h>
+#include <asm/delay.h>
+#include <asm/idprom.h>
+#include <asm/machines.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/sbus.h>
+#include <asm/vac-ops.h>
+#include <asm/vaddrs.h>
+
+struct Linux_SBus_DMA *dma_chain;
+
+/* Print out the current values in the DMA control registers */
+void
+dump_dma_regs(struct sparc_dma_registers *dregs)
+{
+	printk("DMA CONTROL<%08lx>  ADDR<%08lx> CNT<%08lx> TEST<%08lx>\n",
+	       dregs->cond_reg,
+	       (unsigned long) dregs->st_addr,
+	       (unsigned long) dregs->cnt,
+	       (unsigned long) dregs->dma_test);
+	return;
+}
+
+
+/* Probe this SBus DMA module(s) */
+unsigned long
+dvma_init(struct linux_sbus *sbus, unsigned long memory_start)
+{
+	struct linux_sbus_device *this_dev;
+	struct Linux_SBus_DMA *dma;
+	struct Linux_SBus_DMA *dchain;
+	static int num_dma=0;
+
+	for_each_sbusdev(this_dev, sbus) {
+		if(strcmp(this_dev->prom_name, "dma") &&
+		   strcmp(this_dev->prom_name, "ledma") &&
+		   strcmp(this_dev->prom_name, "espdma"))
+			continue;
+
+		/* Found one... */
+		dma = (struct Linux_SBus_DMA *) memory_start;
+		memory_start += sizeof(struct Linux_SBus_DMA);
+
+		dma->SBus_dev = this_dev;
+
+		/* Put at end of dma chain */
+		dchain = dma_chain;
+		if(dchain) {
+			while(dchain->next) dchain=dchain->next;
+			dchain->next=dma;
+		} else {
+			/* We're the first in line */
+			dma_chain=dma;
+		}
+		dma->next = 0;
+
+		printk("dma%d: ", num_dma);
+		num_dma++;
+
+		/* The constant PAGE_SIZE that is passed to sparc_alloc_io makes the
+		 * routine only alloc 1 page, that was what the original code did
+		 */
+		prom_apply_sbus_ranges(dma->SBus_dev->reg_addrs, 0x1);
+		dma->regs = (struct sparc_dma_registers *)
+			sparc_alloc_io (dma->SBus_dev->reg_addrs[0].phys_addr, 0,
+					PAGE_SIZE, "dma",
+					dma->SBus_dev->reg_addrs[0].which_io, 0x0);
+
+		dma->node = dma->SBus_dev->prom_node;
+		dma->running=0;      /* No tranfers going on as of yet */
+		dma->allocated=0;    /* No one has allocated us yet */
+		switch((dma->regs->cond_reg)&DMA_DEVICE_ID) {
+		case DMA_VERS0:
+			dma->revision=dvmarev0;
+			printk("Revision 0 ");
+			break;
+		case DMA_ESCV1:
+			dma->revision=dvmaesc1;
+			printk("ESC Revision 1 ");
+			break;
+		case DMA_VERS1:
+			dma->revision=dvmarev1;
+			printk("Revision 1 ");
+			break;
+		case DMA_VERS2:
+			dma->revision=dvmarev2;
+			printk("Revision 2 ");
+			break;
+		case DMA_VERSPLUS:
+			dma->revision=dvmarevplus;
+			printk("Revision 1 PLUS ");
+			break;
+		default:
+			printk("unknown dma version");
+			dma->allocated = 1;
+			break;
+		}
+		printk("\n");
+#if 0 /* Clutters up the screen */
+		dump_dma_regs(dma->regs);
+#endif
+	};  /* while(this_dev) */
+
+	return memory_start;
+}
+