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1da177e4 LT |
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 | ||
1da177e4 LT |
6 | #include <linux/string.h> |
7 | #include <linux/kernel.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/delay.h> | |
11 | ||
12 | #include <asm/oplib.h> | |
13 | #include <asm/io.h> | |
14 | #include <asm/dma.h> | |
15 | #include <asm/sbus.h> | |
16 | ||
17 | struct sbus_dma *dma_chain; | |
18 | ||
19 | void __init init_one_dvma(struct sbus_dma *dma, int num_dma) | |
20 | { | |
21 | printk("dma%d: ", num_dma); | |
22 | ||
23 | dma->next = NULL; | |
24 | dma->running = 0; /* No transfers going on as of yet */ | |
25 | dma->allocated = 0; /* No one has allocated us yet */ | |
26 | switch(sbus_readl(dma->regs + DMA_CSR)&DMA_DEVICE_ID) { | |
27 | case DMA_VERS0: | |
28 | dma->revision = dvmarev0; | |
29 | printk("Revision 0 "); | |
30 | break; | |
31 | case DMA_ESCV1: | |
32 | dma->revision = dvmaesc1; | |
33 | printk("ESC Revision 1 "); | |
34 | break; | |
35 | case DMA_VERS1: | |
36 | dma->revision = dvmarev1; | |
37 | printk("Revision 1 "); | |
38 | break; | |
39 | case DMA_VERS2: | |
40 | dma->revision = dvmarev2; | |
41 | printk("Revision 2 "); | |
42 | break; | |
43 | case DMA_VERHME: | |
44 | dma->revision = dvmahme; | |
45 | printk("HME DVMA gate array "); | |
46 | break; | |
47 | case DMA_VERSPLUS: | |
48 | dma->revision = dvmarevplus; | |
49 | printk("Revision 1 PLUS "); | |
50 | break; | |
51 | default: | |
52 | printk("unknown dma version %08x", | |
53 | sbus_readl(dma->regs + DMA_CSR) & DMA_DEVICE_ID); | |
54 | dma->allocated = 1; | |
55 | break; | |
56 | } | |
57 | printk("\n"); | |
58 | } | |
59 | ||
60 | /* Probe this SBus DMA module(s) */ | |
61 | void __init dvma_init(struct sbus_bus *sbus) | |
62 | { | |
63 | struct sbus_dev *this_dev; | |
64 | struct sbus_dma *dma; | |
65 | struct sbus_dma *dchain; | |
66 | static int num_dma = 0; | |
67 | ||
68 | for_each_sbusdev(this_dev, sbus) { | |
69 | char *name = this_dev->prom_name; | |
70 | int hme = 0; | |
71 | ||
72 | if(!strcmp(name, "SUNW,fas")) | |
73 | hme = 1; | |
74 | else if(strcmp(name, "dma") && | |
75 | strcmp(name, "ledma") && | |
76 | strcmp(name, "espdma")) | |
77 | continue; | |
78 | ||
79 | /* Found one... */ | |
80 | dma = kmalloc(sizeof(struct sbus_dma), GFP_ATOMIC); | |
81 | ||
82 | dma->sdev = this_dev; | |
83 | ||
84 | /* Put at end of dma chain */ | |
85 | dchain = dma_chain; | |
86 | if(dchain) { | |
87 | while(dchain->next) | |
88 | dchain = dchain->next; | |
89 | dchain->next = dma; | |
90 | } else { | |
91 | /* We're the first in line */ | |
92 | dma_chain = dma; | |
93 | } | |
94 | ||
95 | dma->regs = sbus_ioremap(&dma->sdev->resource[0], 0, | |
96 | dma->sdev->resource[0].end - dma->sdev->resource[0].start + 1, | |
97 | "dma"); | |
98 | ||
99 | dma->node = dma->sdev->prom_node; | |
100 | ||
101 | init_one_dvma(dma, num_dma++); | |
102 | } | |
103 | } | |
104 | ||
105 | #ifdef CONFIG_SUN4 | |
106 | ||
107 | #include <asm/sun4paddr.h> | |
108 | ||
109 | void __init sun4_dvma_init(void) | |
110 | { | |
111 | struct sbus_dma *dma; | |
112 | struct resource r; | |
113 | ||
114 | if(sun4_dma_physaddr) { | |
115 | dma = kmalloc(sizeof(struct sbus_dma), GFP_ATOMIC); | |
116 | ||
117 | /* No SBUS */ | |
118 | dma->sdev = NULL; | |
119 | ||
120 | /* Only one DMA device */ | |
121 | dma_chain = dma; | |
122 | ||
123 | memset(&r, 0, sizeof(r)); | |
124 | r.start = sun4_dma_physaddr; | |
125 | dma->regs = sbus_ioremap(&r, 0, PAGE_SIZE, "dma"); | |
126 | ||
127 | /* No prom node */ | |
128 | dma->node = 0x0; | |
129 | ||
130 | init_one_dvma(dma, 0); | |
131 | } else { | |
132 | dma_chain = NULL; | |
133 | } | |
134 | } | |
135 | ||
136 | #endif |