| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* dvma.c: Routines that are used to access DMA on the Sparc SBus. |
| 2 | * |
| 3 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) |
| 4 | */ |
| 5 | |
| 6 | #include <linux/config.h> |
| 7 | #include <linux/string.h> |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/slab.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/delay.h> |
| 12 | |
| 13 | #include <asm/oplib.h> |
| 14 | #include <asm/io.h> |
| 15 | #include <asm/dma.h> |
| 16 | #include <asm/sbus.h> |
| 17 | |
| 18 | struct sbus_dma *dma_chain; |
| 19 | |
| 20 | void __init init_one_dvma(struct sbus_dma *dma, int num_dma) |
| 21 | { |
| 22 | printk("dma%d: ", num_dma); |
| 23 | |
| 24 | dma->next = NULL; |
| 25 | dma->running = 0; /* No transfers going on as of yet */ |
| 26 | dma->allocated = 0; /* No one has allocated us yet */ |
| 27 | switch(sbus_readl(dma->regs + DMA_CSR)&DMA_DEVICE_ID) { |
| 28 | case DMA_VERS0: |
| 29 | dma->revision = dvmarev0; |
| 30 | printk("Revision 0 "); |
| 31 | break; |
| 32 | case DMA_ESCV1: |
| 33 | dma->revision = dvmaesc1; |
| 34 | printk("ESC Revision 1 "); |
| 35 | break; |
| 36 | case DMA_VERS1: |
| 37 | dma->revision = dvmarev1; |
| 38 | printk("Revision 1 "); |
| 39 | break; |
| 40 | case DMA_VERS2: |
| 41 | dma->revision = dvmarev2; |
| 42 | printk("Revision 2 "); |
| 43 | break; |
| 44 | case DMA_VERHME: |
| 45 | dma->revision = dvmahme; |
| 46 | printk("HME DVMA gate array "); |
| 47 | break; |
| 48 | case DMA_VERSPLUS: |
| 49 | dma->revision = dvmarevplus; |
| 50 | printk("Revision 1 PLUS "); |
| 51 | break; |
| 52 | default: |
| 53 | printk("unknown dma version %08x", |
| 54 | sbus_readl(dma->regs + DMA_CSR) & DMA_DEVICE_ID); |
| 55 | dma->allocated = 1; |
| 56 | break; |
| 57 | } |
| 58 | printk("\n"); |
| 59 | } |
| 60 | |
| 61 | /* Probe this SBus DMA module(s) */ |
| 62 | void __init dvma_init(struct sbus_bus *sbus) |
| 63 | { |
| 64 | struct sbus_dev *this_dev; |
| 65 | struct sbus_dma *dma; |
| 66 | struct sbus_dma *dchain; |
| 67 | static int num_dma = 0; |
| 68 | |
| 69 | for_each_sbusdev(this_dev, sbus) { |
| 70 | char *name = this_dev->prom_name; |
| 71 | int hme = 0; |
| 72 | |
| 73 | if(!strcmp(name, "SUNW,fas")) |
| 74 | hme = 1; |
| 75 | else if(strcmp(name, "dma") && |
| 76 | strcmp(name, "ledma") && |
| 77 | strcmp(name, "espdma")) |
| 78 | continue; |
| 79 | |
| 80 | /* Found one... */ |
| 81 | dma = kmalloc(sizeof(struct sbus_dma), GFP_ATOMIC); |
| 82 | |
| 83 | dma->sdev = this_dev; |
| 84 | |
| 85 | /* Put at end of dma chain */ |
| 86 | dchain = dma_chain; |
| 87 | if(dchain) { |
| 88 | while(dchain->next) |
| 89 | dchain = dchain->next; |
| 90 | dchain->next = dma; |
| 91 | } else { |
| 92 | /* We're the first in line */ |
| 93 | dma_chain = dma; |
| 94 | } |
| 95 | |
| 96 | dma->regs = sbus_ioremap(&dma->sdev->resource[0], 0, |
| 97 | dma->sdev->resource[0].end - dma->sdev->resource[0].start + 1, |
| 98 | "dma"); |
| 99 | |
| 100 | dma->node = dma->sdev->prom_node; |
| 101 | |
| 102 | init_one_dvma(dma, num_dma++); |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | #ifdef CONFIG_SUN4 |
| 107 | |
| 108 | #include <asm/sun4paddr.h> |
| 109 | |
| 110 | void __init sun4_dvma_init(void) |
| 111 | { |
| 112 | struct sbus_dma *dma; |
| 113 | struct resource r; |
| 114 | |
| 115 | if(sun4_dma_physaddr) { |
| 116 | dma = kmalloc(sizeof(struct sbus_dma), GFP_ATOMIC); |
| 117 | |
| 118 | /* No SBUS */ |
| 119 | dma->sdev = NULL; |
| 120 | |
| 121 | /* Only one DMA device */ |
| 122 | dma_chain = dma; |
| 123 | |
| 124 | memset(&r, 0, sizeof(r)); |
| 125 | r.start = sun4_dma_physaddr; |
| 126 | dma->regs = sbus_ioremap(&r, 0, PAGE_SIZE, "dma"); |
| 127 | |
| 128 | /* No prom node */ |
| 129 | dma->node = 0x0; |
| 130 | |
| 131 | init_one_dvma(dma, 0); |
| 132 | } else { |
| 133 | dma_chain = NULL; |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | #endif |