/* 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/string.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/delay.h> #include <asm/oplib.h> #include <asm/io.h> #include <asm/dma.h> #include <asm/sbus.h> struct sbus_dma *dma_chain; static void __init init_one_dvma(struct sbus_dma *dma, int num_dma) { printk("dma%d: ", num_dma); dma->next = NULL; dma->running = 0; /* No transfers going on as of yet */ dma->allocated = 0; /* No one has allocated us yet */ switch(sbus_readl(dma->regs + DMA_CSR)&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_VERHME: dma->revision = dvmahme; printk("HME DVMA gate array "); break; case DMA_VERSPLUS: dma->revision = dvmarevplus; printk("Revision 1 PLUS "); break; default: printk("unknown dma version %08x", sbus_readl(dma->regs + DMA_CSR) & DMA_DEVICE_ID); dma->allocated = 1; break; } printk("\n"); } /* Probe this SBus DMA module(s) */ void __init dvma_init(struct sbus_bus *sbus) { struct sbus_dev *this_dev; struct sbus_dma *dma; struct sbus_dma *dchain; static int num_dma = 0; for_each_sbusdev(this_dev, sbus) { char *name = this_dev->prom_name; int hme = 0; if(!strcmp(name, "SUNW,fas")) hme = 1; else if(strcmp(name, "dma") && strcmp(name, "ledma") && strcmp(name, "espdma")) continue; /* Found one... */ dma = kmalloc(sizeof(struct sbus_dma), GFP_ATOMIC); dma->sdev = 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->regs = sbus_ioremap(&dma->sdev->resource[0], 0, dma->sdev->resource[0].end - dma->sdev->resource[0].start + 1, "dma"); dma->node = dma->sdev->prom_node; init_one_dvma(dma, num_dma++); } } #ifdef CONFIG_SUN4 #include <asm/sun4paddr.h> void __init sun4_dvma_init(void) { struct sbus_dma *dma; struct resource r; if(sun4_dma_physaddr) { dma = kmalloc(sizeof(struct sbus_dma), GFP_ATOMIC); /* No SBUS */ dma->sdev = NULL; /* Only one DMA device */ dma_chain = dma; memset(&r, 0, sizeof(r)); r.start = sun4_dma_physaddr; dma->regs = sbus_ioremap(&r, 0, PAGE_SIZE, "dma"); /* No prom node */ dma->node = 0x0; init_one_dvma(dma, 0); } else { dma_chain = NULL; } } #endif