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11#include <linux/types.h>
12#include <linux/kernel.h>
13#include <linux/mm.h>
14#include <linux/kdev_t.h>
15#include <linux/major.h>
16#include <linux/init.h>
17#include <linux/slab.h>
18#include <linux/vmalloc.h>
19#include <linux/pagemap.h>
20#include <linux/bootmem.h>
21#include <linux/mount.h>
22#include <linux/blkdev.h>
23#include <linux/module.h>
24#include <linux/ioport.h>
25
26#include <asm/setup.h>
27#include <asm/machdep.h>
28#include <asm/page.h>
29#include <asm/pgtable.h>
30#include <asm/atarihw.h>
31#include <asm/atari_stram.h>
32#include <asm/io.h>
33
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41
42
43static int kernel_in_stram;
44
45static struct resource stram_pool = {
46 .name = "ST-RAM Pool"
47};
48
49static unsigned long pool_size = 1024*1024;
50
51static unsigned long stram_virt_offset;
52
53static int __init atari_stram_setup(char *arg)
54{
55 if (!MACH_IS_ATARI)
56 return 0;
57
58 pool_size = memparse(arg, NULL);
59 return 0;
60}
61
62early_param("stram_pool", atari_stram_setup);
63
64
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66
67
68
69void __init atari_stram_init(void)
70{
71 int i;
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75
76
77 kernel_in_stram = (m68k_memory[0].addr == 0);
78
79 for (i = 0; i < m68k_num_memory; ++i) {
80 if (m68k_memory[i].addr == 0) {
81 return;
82 }
83 }
84
85
86 panic("atari_stram_init: no ST-RAM found!");
87}
88
89
90
91
92
93
94void __init atari_stram_reserve_pages(void *start_mem)
95{
96 if (kernel_in_stram) {
97 pr_debug("atari_stram pool: kernel in ST-RAM, using alloc_bootmem!\n");
98 stram_pool.start = (resource_size_t)alloc_bootmem_low_pages(pool_size);
99 stram_pool.end = stram_pool.start + pool_size - 1;
100 request_resource(&iomem_resource, &stram_pool);
101 stram_virt_offset = 0;
102 pr_debug("atari_stram pool: size = %lu bytes, resource = %pR\n",
103 pool_size, &stram_pool);
104 pr_debug("atari_stram pool: stram_virt_offset = %lx\n",
105 stram_virt_offset);
106 }
107}
108
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111
112
113
114int __init atari_stram_map_pages(void)
115{
116 if (!kernel_in_stram) {
117
118
119
120 pr_debug("atari_stram pool: kernel not in ST-RAM, using ioremap!\n");
121 stram_pool.start = PAGE_SIZE;
122 stram_pool.end = stram_pool.start + pool_size - 1;
123 request_resource(&iomem_resource, &stram_pool);
124 stram_virt_offset = (unsigned long) ioremap(stram_pool.start,
125 resource_size(&stram_pool)) - stram_pool.start;
126 pr_debug("atari_stram pool: size = %lu bytes, resource = %pR\n",
127 pool_size, &stram_pool);
128 pr_debug("atari_stram pool: stram_virt_offset = %lx\n",
129 stram_virt_offset);
130 }
131 return 0;
132}
133arch_initcall(atari_stram_map_pages);
134
135
136void *atari_stram_to_virt(unsigned long phys)
137{
138 return (void *)(phys + stram_virt_offset);
139}
140EXPORT_SYMBOL(atari_stram_to_virt);
141
142
143unsigned long atari_stram_to_phys(void *virt)
144{
145 return (unsigned long)(virt - stram_virt_offset);
146}
147EXPORT_SYMBOL(atari_stram_to_phys);
148
149
150void *atari_stram_alloc(unsigned long size, const char *owner)
151{
152 struct resource *res;
153 int error;
154
155 pr_debug("atari_stram_alloc: allocate %lu bytes\n", size);
156
157
158 size = PAGE_ALIGN(size);
159
160 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
161 if (!res)
162 return NULL;
163
164 res->name = owner;
165 error = allocate_resource(&stram_pool, res, size, 0, UINT_MAX,
166 PAGE_SIZE, NULL, NULL);
167 if (error < 0) {
168 pr_err("atari_stram_alloc: allocate_resource() failed %d!\n",
169 error);
170 kfree(res);
171 return NULL;
172 }
173
174 pr_debug("atari_stram_alloc: returning %pR\n", res);
175 return atari_stram_to_virt(res->start);
176}
177EXPORT_SYMBOL(atari_stram_alloc);
178
179
180void atari_stram_free(void *addr)
181{
182 unsigned long start = atari_stram_to_phys(addr);
183 struct resource *res;
184 unsigned long size;
185
186 res = lookup_resource(&stram_pool, start);
187 if (!res) {
188 pr_err("atari_stram_free: trying to free nonexistent region "
189 "at %p\n", addr);
190 return;
191 }
192
193 size = resource_size(res);
194 pr_debug("atari_stram_free: free %lu bytes at %p\n", size, addr);
195 release_resource(res);
196 kfree(res);
197}
198EXPORT_SYMBOL(atari_stram_free);
199