1/* $Id: sbus.h,v 1.1.1.1 2008/10/15 03:27:26 james26_jang Exp $
2 * sbus.h:  Defines for the Sun SBus.
3 *
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 */
6
7#ifndef _SPARC_SBUS_H
8#define _SPARC_SBUS_H
9
10#include <linux/ioport.h>
11
12#include <asm/oplib.h>
13#include <asm/iommu.h>
14#include <asm/scatterlist.h>
15
16/* We scan which devices are on the SBus using the PROM node device
17 * tree.  SBus devices are described in two different ways.  You can
18 * either get an absolute address at which to access the device, or
19 * you can get a SBus 'slot' number and an offset within that slot.
20 */
21
22/* The base address at which to calculate device OBIO addresses. */
23#define SUN_SBUS_BVADDR        0xf8000000
24#define SBUS_OFF_MASK          0x01ffffff
25
26/* These routines are used to calculate device address from slot
27 * numbers + offsets, and vice versa.
28 */
29
30extern __inline__ unsigned long sbus_devaddr(int slotnum, unsigned long offset)
31{
32  return (unsigned long) (SUN_SBUS_BVADDR+((slotnum)<<25)+(offset));
33}
34
35extern __inline__ int sbus_dev_slot(unsigned long dev_addr)
36{
37  return (int) (((dev_addr)-SUN_SBUS_BVADDR)>>25);
38}
39
40struct sbus_bus;
41
42/* Linux SBUS device tables */
43struct sbus_dev {
44	struct sbus_bus	*bus;       /* Back ptr to sbus */
45	struct sbus_dev	*next;      /* next device on this SBus or null */
46	struct sbus_dev	*child;     /* For ledma and espdma on sun4m */
47	struct sbus_dev	*parent;    /* Parent device if not toplevel */
48	int prom_node;              /* PROM device tree node for this device */
49	char prom_name[64];         /* PROM device name */
50	int slot;
51
52	struct resource resource[PROMREG_MAX];
53
54	struct linux_prom_registers reg_addrs[PROMREG_MAX];
55	int num_registers, ranges_applied;
56
57	struct linux_prom_ranges device_ranges[PROMREG_MAX];
58	int num_device_ranges;
59
60	unsigned int irqs[4];
61	int num_irqs;
62};
63
64/* This struct describes the SBus(s) found on this machine. */
65struct sbus_bus {
66	void			*iommu;		/* Opaque IOMMU cookie */
67	struct sbus_dev		*devices;	/* Link to devices on this SBus */
68	struct sbus_bus		*next;		/* next SBus, if more than one SBus */
69	int			prom_node;	/* PROM device tree node for this SBus */
70	char			prom_name[64];  /* Usually "sbus" or "sbi" */
71	int			clock_freq;
72
73	struct linux_prom_ranges sbus_ranges[PROMREG_MAX];
74	int num_sbus_ranges;
75
76	int devid;
77	int board;
78};
79
80extern struct sbus_bus *sbus_root;
81
82extern __inline__ int
83sbus_is_slave(struct sbus_dev *dev)
84{
85	return 0;
86}
87
88/* Device probing routines could find these handy */
89#define for_each_sbus(bus) \
90        for((bus) = sbus_root; (bus); (bus)=(bus)->next)
91
92#define for_each_sbusdev(device, bus) \
93        for((device) = (bus)->devices; (device); (device)=(device)->next)
94
95#define for_all_sbusdev(device, bus) \
96	for ((bus) = sbus_root; (bus); (bus) = (bus)->next) \
97		for ((device) = (bus)->devices; (device); (device) = (device)->next)
98
99/* Driver DVMA interfaces. */
100#define sbus_can_dma_64bit(sdev)	(0) /* actually, sparc_cpu_model==sun4d */
101#define sbus_can_burst64(sdev)		(0) /* actually, sparc_cpu_model==sun4d */
102extern void sbus_set_sbus64(struct sbus_dev *, int);
103
104/* These yield IOMMU mappings in consistent mode. */
105extern void *sbus_alloc_consistent(struct sbus_dev *, long, u32 *dma_addrp);
106extern void sbus_free_consistent(struct sbus_dev *, long, void *, u32);
107
108#define SBUS_DMA_BIDIRECTIONAL	0
109#define SBUS_DMA_TODEVICE	1
110#define SBUS_DMA_FROMDEVICE	2
111#define	SBUS_DMA_NONE		3
112
113/* All the rest use streaming mode mappings. */
114extern dma_addr_t sbus_map_single(struct sbus_dev *, void *, size_t, int);
115extern void sbus_unmap_single(struct sbus_dev *, dma_addr_t, size_t, int);
116extern int sbus_map_sg(struct sbus_dev *, struct scatterlist *, int, int);
117extern void sbus_unmap_sg(struct sbus_dev *, struct scatterlist *, int, int);
118
119/* Finally, allow explicit synchronization of streamable mappings. */
120extern void sbus_dma_sync_single(struct sbus_dev *, dma_addr_t, size_t, int);
121extern void sbus_dma_sync_sg(struct sbus_dev *, struct scatterlist *, int, int);
122
123#endif /* !(_SPARC_SBUS_H) */
124