tjh.dev
Linux kernel mirror (for testing)
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1/* $Id: sbus.h,v 1.22 2000/02/18 13:50:50 davem 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/dma-mapping.h>
11#include <linux/ioport.h>
12
13#include <asm/oplib.h>
14/* #include <asm/iommu.h> */ /* Unused since we use opaque iommu (|io-unit) */
15#include <asm/scatterlist.h>
16
17/* We scan which devices are on the SBus using the PROM node device
18 * tree. SBus devices are described in two different ways. You can
19 * either get an absolute address at which to access the device, or
20 * you can get a SBus 'slot' number and an offset within that slot.
21 */
22
23/* The base address at which to calculate device OBIO addresses. */
24#define SUN_SBUS_BVADDR 0xf8000000
25#define SBUS_OFF_MASK 0x01ffffff
26
27/* These routines are used to calculate device address from slot
28 * numbers + offsets, and vice versa.
29 */
30
31static inline unsigned long sbus_devaddr(int slotnum, unsigned long offset)
32{
33 return (unsigned long) (SUN_SBUS_BVADDR+((slotnum)<<25)+(offset));
34}
35
36static inline int sbus_dev_slot(unsigned long dev_addr)
37{
38 return (int) (((dev_addr)-SUN_SBUS_BVADDR)>>25);
39}
40
41struct sbus_bus;
42
43/* Linux SBUS device tables */
44struct sbus_dev {
45 struct sbus_bus *bus; /* Back ptr to sbus */
46 struct sbus_dev *next; /* next device on this SBus or null */
47 struct sbus_dev *child; /* For ledma and espdma on sun4m */
48 struct sbus_dev *parent; /* Parent device if not toplevel */
49 int prom_node; /* PROM device tree node for this device */
50 char prom_name[64]; /* PROM device name */
51 int slot;
52
53 struct resource resource[PROMREG_MAX];
54
55 struct linux_prom_registers reg_addrs[PROMREG_MAX];
56 int num_registers, ranges_applied;
57
58 struct linux_prom_ranges device_ranges[PROMREG_MAX];
59 int num_device_ranges;
60
61 unsigned int irqs[4];
62 int num_irqs;
63};
64
65/* This struct describes the SBus(s) found on this machine. */
66struct sbus_bus {
67 void *iommu; /* Opaque IOMMU cookie */
68 struct sbus_dev *devices; /* Link to devices on this SBus */
69 struct sbus_bus *next; /* next SBus, if more than one SBus */
70 int prom_node; /* PROM device tree node for this SBus */
71 char prom_name[64]; /* Usually "sbus" or "sbi" */
72 int clock_freq;
73
74 struct linux_prom_ranges sbus_ranges[PROMREG_MAX];
75 int num_sbus_ranges;
76
77 int devid;
78 int board;
79};
80
81extern struct sbus_bus *sbus_root;
82
83static inline int
84sbus_is_slave(struct sbus_dev *dev)
85{
86 /* XXX Have to write this for sun4c's */
87 return 0;
88}
89
90/* Device probing routines could find these handy */
91#define for_each_sbus(bus) \
92 for((bus) = sbus_root; (bus); (bus)=(bus)->next)
93
94#define for_each_sbusdev(device, bus) \
95 for((device) = (bus)->devices; (device); (device)=(device)->next)
96
97#define for_all_sbusdev(device, bus) \
98 for ((bus) = sbus_root; (bus); (bus) = (bus)->next) \
99 for ((device) = (bus)->devices; (device); (device) = (device)->next)
100
101/* Driver DVMA interfaces. */
102#define sbus_can_dma_64bit(sdev) (0) /* actually, sparc_cpu_model==sun4d */
103#define sbus_can_burst64(sdev) (0) /* actually, sparc_cpu_model==sun4d */
104extern void sbus_set_sbus64(struct sbus_dev *, int);
105
106/* These yield IOMMU mappings in consistent mode. */
107extern void *sbus_alloc_consistent(struct sbus_dev *, long, u32 *dma_addrp);
108extern void sbus_free_consistent(struct sbus_dev *, long, void *, u32);
109void prom_adjust_ranges(struct linux_prom_ranges *, int,
110 struct linux_prom_ranges *, int);
111
112#define SBUS_DMA_BIDIRECTIONAL DMA_BIDIRECTIONAL
113#define SBUS_DMA_TODEVICE DMA_TO_DEVICE
114#define SBUS_DMA_FROMDEVICE DMA_FROM_DEVICE
115#define SBUS_DMA_NONE DMA_NONE
116
117/* All the rest use streaming mode mappings. */
118extern dma_addr_t sbus_map_single(struct sbus_dev *, void *, size_t, int);
119extern void sbus_unmap_single(struct sbus_dev *, dma_addr_t, size_t, int);
120extern int sbus_map_sg(struct sbus_dev *, struct scatterlist *, int, int);
121extern void sbus_unmap_sg(struct sbus_dev *, struct scatterlist *, int, int);
122
123/* Finally, allow explicit synchronization of streamable mappings. */
124extern void sbus_dma_sync_single_for_cpu(struct sbus_dev *, dma_addr_t, size_t, int);
125#define sbus_dma_sync_single sbus_dma_sync_single_for_cpu
126extern void sbus_dma_sync_single_for_device(struct sbus_dev *, dma_addr_t, size_t, int);
127extern void sbus_dma_sync_sg_for_cpu(struct sbus_dev *, struct scatterlist *, int, int);
128#define sbus_dma_sync_sg sbus_dma_sync_sg_for_cpu
129extern void sbus_dma_sync_sg_for_device(struct sbus_dev *, struct scatterlist *, int, int);
130
131/* Eric Brower (ebrower@usa.net)
132 * Translate SBus interrupt levels to ino values--
133 * this is used when converting sbus "interrupts" OBP
134 * node values to "intr" node values, and is platform
135 * dependent. If only we could call OBP with
136 * "sbus-intr>cpu (sbint -- ino)" from kernel...
137 * See .../drivers/sbus/sbus.c for details.
138 */
139BTFIXUPDEF_CALL(unsigned int, sbint_to_irq, struct sbus_dev *sdev, unsigned int)
140#define sbint_to_irq(sdev, sbint) BTFIXUP_CALL(sbint_to_irq)(sdev, sbint)
141
142#endif /* !(_SPARC_SBUS_H) */