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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [drivers/] [sbus/] [dvma.c] - Rev 901
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/* 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 transfers 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; }
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