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/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
17struct sbus_dma *dma_chain;
18
19void __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) */
61void __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
109void __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
137