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1/*
2** linux/amiga/chipram.c
3**
4** Modified 03-May-94 by Geert Uytterhoeven <geert@linux-m68k.org>
5** - 64-bit aligned allocations for full AGA compatibility
6**
7** Rewritten 15/9/2000 by Geert to use resource management
8*/
9
10#include <linux/types.h>
11#include <linux/kernel.h>
12#include <linux/mm.h>
13#include <linux/init.h>
14#include <linux/ioport.h>
15#include <linux/slab.h>
16#include <linux/string.h>
17#include <linux/module.h>
18
19#include <asm/atomic.h>
20#include <asm/page.h>
21#include <asm/amigahw.h>
22
23unsigned long amiga_chip_size;
24EXPORT_SYMBOL(amiga_chip_size);
25
26static struct resource chipram_res = {
27 .name = "Chip RAM", .start = CHIP_PHYSADDR
28};
29static atomic_t chipavail;
30
31
32void __init amiga_chip_init(void)
33{
34 if (!AMIGAHW_PRESENT(CHIP_RAM))
35 return;
36
37 chipram_res.end = CHIP_PHYSADDR + amiga_chip_size - 1;
38 request_resource(&iomem_resource, &chipram_res);
39
40 atomic_set(&chipavail, amiga_chip_size);
41}
42
43
44void *amiga_chip_alloc(unsigned long size, const char *name)
45{
46 struct resource *res;
47 void *p;
48
49 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
50 if (!res)
51 return NULL;
52
53 res->name = name;
54 p = amiga_chip_alloc_res(size, res);
55 if (!p) {
56 kfree(res);
57 return NULL;
58 }
59
60 return p;
61}
62EXPORT_SYMBOL(amiga_chip_alloc);
63
64
65 /*
66 * Warning:
67 * amiga_chip_alloc_res is meant only for drivers that need to
68 * allocate Chip RAM before kmalloc() is functional. As a consequence,
69 * those drivers must not free that Chip RAM afterwards.
70 */
71
72void *amiga_chip_alloc_res(unsigned long size, struct resource *res)
73{
74 int error;
75
76 /* round up */
77 size = PAGE_ALIGN(size);
78
79 pr_debug("amiga_chip_alloc_res: allocate %lu bytes\n", size);
80 error = allocate_resource(&chipram_res, res, size, 0, UINT_MAX,
81 PAGE_SIZE, NULL, NULL);
82 if (error < 0) {
83 pr_err("amiga_chip_alloc_res: allocate_resource() failed %d!\n",
84 error);
85 return NULL;
86 }
87
88 atomic_sub(size, &chipavail);
89 pr_debug("amiga_chip_alloc_res: returning %pR\n", res);
90 return (void *)ZTWO_VADDR(res->start);
91}
92
93void amiga_chip_free(void *ptr)
94{
95 unsigned long start = ZTWO_PADDR(ptr);
96 struct resource *res;
97 unsigned long size;
98
99 res = lookup_resource(&chipram_res, start);
100 if (!res) {
101 pr_err("amiga_chip_free: trying to free nonexistent region at "
102 "%p\n", ptr);
103 return;
104 }
105
106 size = resource_size(res);
107 pr_debug("amiga_chip_free: free %lu bytes at %p\n", size, ptr);
108 atomic_add(size, &chipavail);
109 release_resource(res);
110 kfree(res);
111}
112EXPORT_SYMBOL(amiga_chip_free);
113
114
115unsigned long amiga_chip_avail(void)
116{
117 unsigned long n = atomic_read(&chipavail);
118
119 pr_debug("amiga_chip_avail : %lu bytes\n", n);
120 return n;
121}
122EXPORT_SYMBOL(amiga_chip_avail);
123
1// SPDX-License-Identifier: GPL-2.0
2/*
3** linux/amiga/chipram.c
4**
5** Modified 03-May-94 by Geert Uytterhoeven <geert@linux-m68k.org>
6** - 64-bit aligned allocations for full AGA compatibility
7**
8** Rewritten 15/9/2000 by Geert to use resource management
9*/
10
11#include <linux/types.h>
12#include <linux/kernel.h>
13#include <linux/mm.h>
14#include <linux/init.h>
15#include <linux/ioport.h>
16#include <linux/slab.h>
17#include <linux/string.h>
18#include <linux/module.h>
19
20#include <asm/atomic.h>
21#include <asm/page.h>
22#include <asm/amigahw.h>
23
24unsigned long amiga_chip_size;
25EXPORT_SYMBOL(amiga_chip_size);
26
27static struct resource chipram_res = {
28 .name = "Chip RAM", .start = CHIP_PHYSADDR
29};
30static atomic_t chipavail;
31
32
33void __init amiga_chip_init(void)
34{
35 if (!AMIGAHW_PRESENT(CHIP_RAM))
36 return;
37
38 chipram_res.end = CHIP_PHYSADDR + amiga_chip_size - 1;
39 request_resource(&iomem_resource, &chipram_res);
40
41 atomic_set(&chipavail, amiga_chip_size);
42}
43
44
45void *amiga_chip_alloc(unsigned long size, const char *name)
46{
47 struct resource *res;
48 void *p;
49
50 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
51 if (!res)
52 return NULL;
53
54 res->name = name;
55 p = amiga_chip_alloc_res(size, res);
56 if (!p) {
57 kfree(res);
58 return NULL;
59 }
60
61 return p;
62}
63EXPORT_SYMBOL(amiga_chip_alloc);
64
65
66 /*
67 * Warning:
68 * amiga_chip_alloc_res is meant only for drivers that need to
69 * allocate Chip RAM before kmalloc() is functional. As a consequence,
70 * those drivers must not free that Chip RAM afterwards.
71 */
72
73void *amiga_chip_alloc_res(unsigned long size, struct resource *res)
74{
75 int error;
76
77 /* round up */
78 size = PAGE_ALIGN(size);
79
80 pr_debug("amiga_chip_alloc_res: allocate %lu bytes\n", size);
81 error = allocate_resource(&chipram_res, res, size, 0, UINT_MAX,
82 PAGE_SIZE, NULL, NULL);
83 if (error < 0) {
84 pr_err("amiga_chip_alloc_res: allocate_resource() failed %d!\n",
85 error);
86 return NULL;
87 }
88
89 atomic_sub(size, &chipavail);
90 pr_debug("amiga_chip_alloc_res: returning %pR\n", res);
91 return ZTWO_VADDR(res->start);
92}
93
94void amiga_chip_free(void *ptr)
95{
96 unsigned long start = ZTWO_PADDR(ptr);
97 struct resource *res;
98 unsigned long size;
99
100 res = lookup_resource(&chipram_res, start);
101 if (!res) {
102 pr_err("amiga_chip_free: trying to free nonexistent region at "
103 "%p\n", ptr);
104 return;
105 }
106
107 size = resource_size(res);
108 pr_debug("amiga_chip_free: free %lu bytes at %p\n", size, ptr);
109 atomic_add(size, &chipavail);
110 release_resource(res);
111 kfree(res);
112}
113EXPORT_SYMBOL(amiga_chip_free);
114
115
116unsigned long amiga_chip_avail(void)
117{
118 unsigned long n = atomic_read(&chipavail);
119
120 pr_debug("amiga_chip_avail : %lu bytes\n", n);
121 return n;
122}
123EXPORT_SYMBOL(amiga_chip_avail);
124