1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/* $Id: ioport.c,v 1.24 1997/04/10 03:02:32 davem Exp $
* ioport.c: Simple io mapping allocator.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
*
* The routines in this file should be changed for a memory allocator
* that would be setup just like NetBSD does : you create regions that
* are administered by a general purpose allocator, and then you call
* that allocator with your handle and the block size instead of this
* weak stuff.
*/
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <asm/io.h>
#include <asm/vaddrs.h>
#include <asm/oplib.h>
#include <asm/page.h>
#include <asm/pgtable.h>
/* This points to the next to use virtual memory for io mappings */
static unsigned long dvma_next_free = DVMA_VADDR;
unsigned long sparc_iobase_vaddr = IOBASE_VADDR;
/*
* sparc_alloc_io:
* Map and allocates an obio device.
* Implements a simple linear allocator, you can force the function
* to use your own mapping, but in practice this should not be used.
*
* Input:
* address: the obio address to map
* virtual: if non zero, specifies a fixed virtual address where
* the mapping should take place.
* len: the length of the mapping
* bus_type: The bus on which this io area sits.
*
* Returns:
* The virtual address where the mapping actually took place.
*/
void *sparc_alloc_io (u32 address, void *virtual, int len, char *name,
u32 bus_type, int rdonly)
{
unsigned long vaddr, base_address;
unsigned long addr = (unsigned long) address;
unsigned long offset = (addr & (~PAGE_MASK));
if (virtual) {
vaddr = (unsigned long) virtual;
len += offset;
if(((unsigned long) virtual + len) > (IOBASE_VADDR + IOBASE_LEN)) {
prom_printf("alloc_io: Mapping outside IOBASE area\n");
prom_halt();
}
if(check_region ((vaddr | offset), len)) {
prom_printf("alloc_io: 0x%lx is already in use\n", vaddr);
prom_halt();
}
/* Tell Linux resource manager about the mapping */
request_region ((vaddr | offset), len, name);
} else {
vaddr = occupy_region(sparc_iobase_vaddr, IOBASE_END,
(offset + len + PAGE_SIZE-1) & PAGE_MASK, PAGE_SIZE, name);
if (vaddr == 0) {
/* Usually we cannot see printks in this case. */
prom_printf("alloc_io: cannot occupy %d region\n", len);
prom_halt();
}
}
base_address = vaddr;
/* Do the actual mapping */
for (; len > 0; len -= PAGE_SIZE) {
mapioaddr(addr, vaddr, bus_type, rdonly);
vaddr += PAGE_SIZE;
addr += PAGE_SIZE;
}
return (void *) (base_address | offset);
}
void sparc_free_io (void *virtual, int len)
{
unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
unsigned long plen = (((unsigned long)virtual & ~PAGE_MASK) + len + PAGE_SIZE-1) & PAGE_MASK;
release_region(vaddr, plen);
for (; plen != 0;) {
plen -= PAGE_SIZE;
unmapioaddr(vaddr + plen);
}
}
/* Does DVMA allocations with PAGE_SIZE granularity. How this basically
* works is that the ESP chip can do DVMA transfers at ANY address with
* certain size and boundary restrictions. But other devices that are
* attached to it and would like to do DVMA have to set things up in
* a special way, if the DVMA sees a device attached to it transfer data
* at addresses above DVMA_VADDR it will grab them, this way it does not
* now have to know the peculiarities of where to read the Lance data
* from. (for example)
*/
void *_sparc_dvma_malloc (int len, char *name)
{
unsigned long vaddr, base_address;
vaddr = dvma_next_free;
if(check_region (vaddr, len)) {
prom_printf("alloc_dma: 0x%lx is already in use\n", vaddr);
prom_halt();
}
if(vaddr + len > (DVMA_VADDR + DVMA_LEN)) {
prom_printf("alloc_dvma: out of dvma memory\n");
prom_halt();
}
/* Basically these can be mapped just like any old
* IO pages, cacheable bit off, etc. The physical
* pages are now mapped dynamically to save space.
*/
base_address = vaddr;
mmu_map_dma_area(base_address, len);
/* Assign the memory area. */
dvma_next_free = PAGE_ALIGN(dvma_next_free+len);
request_region(base_address, len, name);
return (void *) base_address;
}
|
