xref: /linux/include/linux/tc.h (revision a1ff5a7d78a036d6c2178ee5acd6ba4946243800)
1 /*
2  *	Interface to the TURBOchannel related routines.
3  *
4  *	Copyright (c) 1998  Harald Koerfgen
5  *	Copyright (c) 2005  James Simmons
6  *	Copyright (c) 2006  Maciej W. Rozycki
7  *
8  *	Based on:
9  *
10  *	"TURBOchannel Firmware Specification", EK-TCAAD-FS-004
11  *
12  *	from Digital Equipment Corporation.
13  *
14  *	This file is subject to the terms and conditions of the GNU
15  *	General Public License.  See the file "COPYING" in the main
16  *	directory of this archive for more details.
17  */
18 #ifndef _LINUX_TC_H
19 #define _LINUX_TC_H
20 
21 #include <linux/compiler.h>
22 #include <linux/device.h>
23 #include <linux/ioport.h>
24 #include <linux/types.h>
25 
26 /*
27  * Offsets for the ROM header locations for TURBOchannel cards.
28  */
29 #define TC_OLDCARD	0x3c0000
30 #define TC_NEWCARD	0x000000
31 
32 #define TC_ROM_WIDTH	0x3e0
33 #define TC_ROM_STRIDE	0x3e4
34 #define TC_ROM_SIZE	0x3e8
35 #define TC_SLOT_SIZE	0x3ec
36 #define TC_PATTERN0	0x3f0
37 #define TC_PATTERN1	0x3f4
38 #define TC_PATTERN2	0x3f8
39 #define TC_PATTERN3	0x3fc
40 #define TC_FIRM_VER	0x400
41 #define TC_VENDOR	0x420
42 #define TC_MODULE	0x440
43 #define TC_FIRM_TYPE	0x460
44 #define TC_FLAGS	0x470
45 #define TC_ROM_OBJECTS	0x480
46 
47 /*
48  * Information obtained through the get_tcinfo() PROM call.
49  */
50 struct tcinfo {
51 	s32		revision;	/* Hardware revision level. */
52 	s32		clk_period;	/* Clock period in nanoseconds. */
53 	s32		slot_size;	/* Slot size in megabytes. */
54 	s32		io_timeout;	/* I/O timeout in cycles. */
55 	s32		dma_range;	/* DMA address range in megabytes. */
56 	s32		max_dma_burst;	/* Maximum DMA burst length. */
57 	s32		parity;		/* System module supports TC parity. */
58 	s32		reserved[4];
59 };
60 
61 /*
62  * TURBOchannel bus.
63  */
64 struct tc_bus {
65 	struct list_head devices;	/* List of devices on this bus. */
66 	struct resource	resource[2];	/* Address space routed to this bus. */
67 
68 	struct device	dev;
69 	char		name[13];
70 	resource_size_t	slot_base;
71 	resource_size_t	ext_slot_base;
72 	resource_size_t	ext_slot_size;
73 	int		num_tcslots;
74 	struct tcinfo	info;
75 };
76 
77 /*
78  * TURBOchannel device.
79  */
80 struct tc_dev {
81 	struct list_head node;		/* Node in list of all TC devices. */
82 	struct tc_bus	*bus;		/* Bus this device is on. */
83 	struct tc_driver *driver;	/* Which driver has allocated this
84 					   device. */
85 	struct device	dev;		/* Generic device interface. */
86 	struct resource	resource;	/* Address space of this device. */
87 	u64		dma_mask;	/* DMA addressable range. */
88 	char		vendor[9];
89 	char		name[9];
90 	char		firmware[9];
91 	int		interrupt;
92 	int		slot;
93 };
94 
95 #define to_tc_dev(n) container_of(n, struct tc_dev, dev)
96 
97 struct tc_device_id {
98 	char		vendor[9];
99 	char		name[9];
100 };
101 
102 /*
103  * TURBOchannel driver.
104  */
105 struct tc_driver {
106 	struct list_head node;
107 	const struct tc_device_id *id_table;
108 	struct device_driver driver;
109 };
110 
111 #define to_tc_driver(drv) container_of_const(drv, struct tc_driver, driver)
112 
113 /*
114  * Return TURBOchannel clock frequency in Hz.
115  */
tc_get_speed(struct tc_bus * tbus)116 static inline unsigned long tc_get_speed(struct tc_bus *tbus)
117 {
118 	return 100000 * (10000 / (unsigned long)tbus->info.clk_period);
119 }
120 
121 #ifdef CONFIG_TC
122 
123 extern const struct bus_type tc_bus_type;
124 
125 extern int tc_register_driver(struct tc_driver *tdrv);
126 extern void tc_unregister_driver(struct tc_driver *tdrv);
127 
128 #else /* !CONFIG_TC */
129 
tc_register_driver(struct tc_driver * tdrv)130 static inline int tc_register_driver(struct tc_driver *tdrv) { return 0; }
tc_unregister_driver(struct tc_driver * tdrv)131 static inline void tc_unregister_driver(struct tc_driver *tdrv) { }
132 
133 #endif /* CONFIG_TC */
134 
135 /*
136  * These have to be provided by the architecture.
137  */
138 extern int tc_preadb(u8 *valp, void __iomem *addr);
139 extern int tc_bus_get_info(struct tc_bus *tbus);
140 extern void tc_device_get_irq(struct tc_dev *tdev);
141 
142 #endif /* _LINUX_TC_H */
143