diff options
Diffstat (limited to 'drivers/sbus/dvma.c')
| -rw-r--r-- | drivers/sbus/dvma.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/drivers/sbus/dvma.c b/drivers/sbus/dvma.c new file mode 100644 index 000000000000..378a1d68024d --- /dev/null +++ b/drivers/sbus/dvma.c @@ -0,0 +1,137 @@ +/* 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/config.h> +#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; + +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 |