137 lines
2.7 KiB
C
137 lines
2.7 KiB
C
/* dvma.c: Routines that are used to access DMA on the Sparc SBus.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <asm/oplib.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <asm/sbus.h>
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struct sbus_dma *dma_chain;
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static void __init init_one_dvma(struct sbus_dma *dma, int num_dma)
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{
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printk("dma%d: ", num_dma);
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dma->next = NULL;
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dma->running = 0; /* No transfers going on as of yet */
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dma->allocated = 0; /* No one has allocated us yet */
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switch(sbus_readl(dma->regs + DMA_CSR)&DMA_DEVICE_ID) {
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case DMA_VERS0:
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dma->revision = dvmarev0;
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printk("Revision 0 ");
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break;
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case DMA_ESCV1:
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dma->revision = dvmaesc1;
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printk("ESC Revision 1 ");
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break;
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case DMA_VERS1:
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dma->revision = dvmarev1;
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printk("Revision 1 ");
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break;
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case DMA_VERS2:
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dma->revision = dvmarev2;
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printk("Revision 2 ");
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break;
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case DMA_VERHME:
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dma->revision = dvmahme;
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printk("HME DVMA gate array ");
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break;
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case DMA_VERSPLUS:
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dma->revision = dvmarevplus;
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printk("Revision 1 PLUS ");
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break;
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default:
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printk("unknown dma version %08x",
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sbus_readl(dma->regs + DMA_CSR) & DMA_DEVICE_ID);
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dma->allocated = 1;
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break;
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}
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printk("\n");
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}
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/* Probe this SBus DMA module(s) */
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void __init dvma_init(struct sbus_bus *sbus)
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{
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struct sbus_dev *this_dev;
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struct sbus_dma *dma;
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struct sbus_dma *dchain;
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static int num_dma = 0;
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for_each_sbusdev(this_dev, sbus) {
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char *name = this_dev->prom_name;
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int hme = 0;
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if(!strcmp(name, "SUNW,fas"))
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hme = 1;
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else if(strcmp(name, "dma") &&
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strcmp(name, "ledma") &&
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strcmp(name, "espdma"))
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continue;
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/* Found one... */
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dma = kmalloc(sizeof(struct sbus_dma), GFP_ATOMIC);
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dma->sdev = this_dev;
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/* Put at end of dma chain */
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dchain = dma_chain;
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if(dchain) {
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while(dchain->next)
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dchain = dchain->next;
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dchain->next = dma;
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} else {
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/* We're the first in line */
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dma_chain = dma;
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}
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dma->regs = sbus_ioremap(&dma->sdev->resource[0], 0,
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dma->sdev->resource[0].end - dma->sdev->resource[0].start + 1,
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"dma");
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dma->node = dma->sdev->prom_node;
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init_one_dvma(dma, num_dma++);
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}
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}
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#ifdef CONFIG_SUN4
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#include <asm/sun4paddr.h>
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void __init sun4_dvma_init(void)
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{
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struct sbus_dma *dma;
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struct resource r;
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if(sun4_dma_physaddr) {
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dma = kmalloc(sizeof(struct sbus_dma), GFP_ATOMIC);
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/* No SBUS */
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dma->sdev = NULL;
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/* Only one DMA device */
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dma_chain = dma;
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memset(&r, 0, sizeof(r));
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r.start = sun4_dma_physaddr;
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dma->regs = sbus_ioremap(&r, 0, PAGE_SIZE, "dma");
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/* No prom node */
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dma->node = 0x0;
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init_one_dvma(dma, 0);
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} else {
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dma_chain = NULL;
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}
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}
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#endif
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