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/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
30 extern __inline__ unsigned long sbus_devaddr(int slotnum, unsigned long offset)
31 {
32 return (unsigned long) (SUN_SBUS_BVADDR+((slotnum)<<25)+(offset));
33 }
34
35 extern __inline__ int sbus_dev_slot(unsigned long dev_addr)
36 {
37 return (int) (((dev_addr)-SUN_SBUS_BVADDR)>>25);
38 }
39
40 struct sbus_bus;
41
42 /* Linux SBUS device tables */
43 struct 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. */
65 struct 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
80 extern struct sbus_bus *sbus_root;
81
82 extern __inline__ int
83 sbus_is_slave(struct sbus_dev *dev)
84 {
85 /* XXX Have to write this for sun4c's */
86 return 0;
87 }
88
89 /* Device probing routines could find these handy */
90 #define for_each_sbus(bus) \
91 for((bus) = sbus_root; (bus); (bus)=(bus)->next)
92
93 #define for_each_sbusdev(device, bus) \
94 for((device) = (bus)->devices; (device); (device)=(device)->next)
95
96 #define for_all_sbusdev(device, bus) \
97 for((bus) = sbus_root, ((device) = (bus) ? (bus)->devices : 0); (bus); (device)=((device)->next ? (device)->next : ((bus) = (bus)->next, (bus) ? (bus)->devices : 0)))
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 */
102 extern void sbus_set_sbus64(struct sbus_dev *, int);
103
104 /* These yield IOMMU mappings in consistent mode. */
105 extern void *sbus_alloc_consistent(struct sbus_dev *, long, u32 *dma_addrp);
106 extern 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. */
114 extern u32 sbus_map_single(struct sbus_dev *, void *, long, int);
115 extern void sbus_unmap_single(struct sbus_dev *, u32, long, int);
116 extern int sbus_map_sg(struct sbus_dev *, struct scatterlist *, int, int);
117 extern void sbus_unmap_sg(struct sbus_dev *, struct scatterlist *, int, int);
118
119 /* Finally, allow explicit synchronization of streamable mappings. */
120 extern void sbus_dma_sync_single(struct sbus_dev *, u32, long, int);
121 extern void sbus_dma_sync_sg(struct sbus_dev *, struct scatterlist *, int, int);
122
123 #endif /* !(_SPARC_SBUS_H) */
124
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