Commit | Line | Data |
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1da177e4 | 1 | /* |
217bbd81 | 2 | * Functions for ST-RAM allocations |
1da177e4 LT |
3 | * |
4 | * Copyright 1994-97 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file COPYING in the main directory of this archive | |
8 | * for more details. | |
9 | */ | |
10 | ||
1da177e4 LT |
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> | |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/vmalloc.h> | |
19 | #include <linux/pagemap.h> | |
1da177e4 LT |
20 | #include <linux/bootmem.h> |
21 | #include <linux/mount.h> | |
22 | #include <linux/blkdev.h> | |
a3b2004a | 23 | #include <linux/module.h> |
9aa59cac | 24 | #include <linux/ioport.h> |
1da177e4 LT |
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> | |
1da177e4 | 33 | |
1da177e4 | 34 | |
f9c98d02 | 35 | /* |
217bbd81 MS |
36 | * The ST-RAM allocator allocates memory from a pool of reserved ST-RAM of |
37 | * configurable size, set aside on ST-RAM init. | |
38 | * As long as this pool is not exhausted, allocation of real ST-RAM can be | |
39 | * guaranteed. | |
1da177e4 LT |
40 | */ |
41 | ||
1da177e4 LT |
42 | /* set if kernel is in ST-RAM */ |
43 | static int kernel_in_stram; | |
44 | ||
217bbd81 MS |
45 | static struct resource stram_pool = { |
46 | .name = "ST-RAM Pool" | |
47 | }; | |
1da177e4 | 48 | |
217bbd81 | 49 | static unsigned long pool_size = 1024*1024; |
1da177e4 | 50 | |
fded332b | 51 | static unsigned long stram_virt_offset; |
1da177e4 | 52 | |
217bbd81 MS |
53 | static int __init atari_stram_setup(char *arg) |
54 | { | |
55 | if (!MACH_IS_ATARI) | |
56 | return 0; | |
1da177e4 | 57 | |
217bbd81 MS |
58 | pool_size = memparse(arg, NULL); |
59 | return 0; | |
60 | } | |
1da177e4 | 61 | |
217bbd81 | 62 | early_param("stram_pool", atari_stram_setup); |
1da177e4 | 63 | |
1da177e4 LT |
64 | |
65 | /* | |
66 | * This init function is called very early by atari/config.c | |
67 | * It initializes some internal variables needed for stram_alloc() | |
68 | */ | |
69 | void __init atari_stram_init(void) | |
70 | { | |
71 | int i; | |
72 | ||
217bbd81 MS |
73 | /* |
74 | * determine whether kernel code resides in ST-RAM | |
75 | * (then ST-RAM is the first memory block at virtual 0x0) | |
76 | */ | |
fded332b | 77 | kernel_in_stram = (m68k_memory[0].addr == 0); |
1da177e4 | 78 | |
217bbd81 | 79 | for (i = 0; i < m68k_num_memory; ++i) { |
1da177e4 | 80 | if (m68k_memory[i].addr == 0) { |
1da177e4 LT |
81 | return; |
82 | } | |
83 | } | |
217bbd81 | 84 | |
1da177e4 | 85 | /* Should never come here! (There is always ST-Ram!) */ |
217bbd81 | 86 | panic("atari_stram_init: no ST-RAM found!"); |
1da177e4 LT |
87 | } |
88 | ||
89 | ||
90 | /* | |
91 | * This function is called from setup_arch() to reserve the pages needed for | |
fded332b | 92 | * ST-RAM management, if the kernel resides in ST-RAM. |
1da177e4 LT |
93 | */ |
94 | void __init atari_stram_reserve_pages(void *start_mem) | |
95 | { | |
fded332b MS |
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 | } | |
1da177e4 | 108 | |
1da177e4 | 109 | |
fded332b MS |
110 | /* |
111 | * This function is called as arch initcall to reserve the pages needed for | |
112 | * ST-RAM management, if the kernel does not reside in ST-RAM. | |
113 | */ | |
114 | int __init atari_stram_map_pages(void) | |
115 | { | |
116 | if (!kernel_in_stram) { | |
117 | /* | |
118 | * Skip page 0, as the fhe first 2 KiB are supervisor-only! | |
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 | } | |
133 | arch_initcall(atari_stram_map_pages); | |
134 | ||
135 | ||
136 | void *atari_stram_to_virt(unsigned long phys) | |
137 | { | |
138 | return (void *)(phys + stram_virt_offset); | |
139 | } | |
140 | EXPORT_SYMBOL(atari_stram_to_virt); | |
141 | ||
142 | ||
143 | unsigned long atari_stram_to_phys(void *virt) | |
144 | { | |
145 | return (unsigned long)(virt - stram_virt_offset); | |
1da177e4 | 146 | } |
fded332b | 147 | EXPORT_SYMBOL(atari_stram_to_phys); |
1da177e4 LT |
148 | |
149 | ||
217bbd81 | 150 | void *atari_stram_alloc(unsigned long size, const char *owner) |
1da177e4 | 151 | { |
217bbd81 MS |
152 | struct resource *res; |
153 | int error; | |
154 | ||
155 | pr_debug("atari_stram_alloc: allocate %lu bytes\n", size); | |
156 | ||
157 | /* round up */ | |
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; | |
1da177e4 LT |
172 | } |
173 | ||
217bbd81 | 174 | pr_debug("atari_stram_alloc: returning %pR\n", res); |
fded332b | 175 | return atari_stram_to_virt(res->start); |
1da177e4 | 176 | } |
a3b2004a | 177 | EXPORT_SYMBOL(atari_stram_alloc); |
1da177e4 | 178 | |
1da177e4 | 179 | |
217bbd81 | 180 | void atari_stram_free(void *addr) |
1da177e4 | 181 | { |
fded332b | 182 | unsigned long start = atari_stram_to_phys(addr); |
217bbd81 MS |
183 | struct resource *res; |
184 | unsigned long size; | |
1da177e4 | 185 | |
217bbd81 MS |
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); | |
1da177e4 LT |
190 | return; |
191 | } | |
f9c98d02 | 192 | |
217bbd81 MS |
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); | |
1da177e4 | 197 | } |
a3b2004a | 198 | EXPORT_SYMBOL(atari_stram_free); |