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15#include <linux/kernel.h>
16#include <linux/suspend.h>
17#include <linux/init.h>
18#include <linux/crc32.h>
19#include <linux/ioport.h>
20
21#include <plat/pm.h>
22
23#if CONFIG_S3C2410_PM_CHECK_CHUNKSIZE < 1
24#error CONFIG_S3C2410_PM_CHECK_CHUNKSIZE must be a positive non-zero value
25#endif
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36
37#define CHECK_CHUNKSIZE (CONFIG_S3C2410_PM_CHECK_CHUNKSIZE * 1024)
38
39static u32 crc_size;
40static u32 *crcs;
41
42typedef u32 *(run_fn_t)(struct resource *ptr, u32 *arg);
43
44
45
46
47
48
49static void s3c_pm_run_res(struct resource *ptr, run_fn_t fn, u32 *arg)
50{
51 while (ptr != NULL) {
52 if (ptr->child != NULL)
53 s3c_pm_run_res(ptr->child, fn, arg);
54
55 if ((ptr->flags & IORESOURCE_MEM) &&
56 strcmp(ptr->name, "System RAM") == 0) {
57 S3C_PMDBG("Found system RAM at %08lx..%08lx\n",
58 (unsigned long)ptr->start,
59 (unsigned long)ptr->end);
60 arg = (fn)(ptr, arg);
61 }
62
63 ptr = ptr->sibling;
64 }
65}
66
67static void s3c_pm_run_sysram(run_fn_t fn, u32 *arg)
68{
69 s3c_pm_run_res(&iomem_resource, fn, arg);
70}
71
72static u32 *s3c_pm_countram(struct resource *res, u32 *val)
73{
74 u32 size = (u32)(res->end - res->start)+1;
75
76 size += CHECK_CHUNKSIZE-1;
77 size /= CHECK_CHUNKSIZE;
78
79 S3C_PMDBG("Area %08lx..%08lx, %d blocks\n",
80 (unsigned long)res->start, (unsigned long)res->end, size);
81
82 *val += size * sizeof(u32);
83 return val;
84}
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93
94void s3c_pm_check_prepare(void)
95{
96 crc_size = 0;
97
98 s3c_pm_run_sysram(s3c_pm_countram, &crc_size);
99
100 S3C_PMDBG("s3c_pm_prepare_check: %u checks needed\n", crc_size);
101
102 crcs = kmalloc(crc_size+4, GFP_KERNEL);
103 if (crcs == NULL)
104 printk(KERN_ERR "Cannot allocated CRC save area\n");
105}
106
107static u32 *s3c_pm_makecheck(struct resource *res, u32 *val)
108{
109 unsigned long addr, left;
110
111 for (addr = res->start; addr < res->end;
112 addr += CHECK_CHUNKSIZE) {
113 left = res->end - addr;
114
115 if (left > CHECK_CHUNKSIZE)
116 left = CHECK_CHUNKSIZE;
117
118 *val = crc32_le(~0, phys_to_virt(addr), left);
119 val++;
120 }
121
122 return val;
123}
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130
131void s3c_pm_check_store(void)
132{
133 if (crcs != NULL)
134 s3c_pm_run_sysram(s3c_pm_makecheck, crcs);
135}
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142
143static inline int in_region(void *ptr, int size, void *what, size_t whatsz)
144{
145 if ((what+whatsz) < ptr)
146 return 0;
147
148 if (what > (ptr+size))
149 return 0;
150
151 return 1;
152}
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163
164static u32 *s3c_pm_runcheck(struct resource *res, u32 *val)
165{
166 void *save_at = phys_to_virt(s3c_sleep_save_phys);
167 unsigned long addr;
168 unsigned long left;
169 void *stkpage;
170 void *ptr;
171 u32 calc;
172
173 stkpage = (void *)((u32)&calc & ~PAGE_MASK);
174
175 for (addr = res->start; addr < res->end;
176 addr += CHECK_CHUNKSIZE) {
177 left = res->end - addr;
178
179 if (left > CHECK_CHUNKSIZE)
180 left = CHECK_CHUNKSIZE;
181
182 ptr = phys_to_virt(addr);
183
184 if (in_region(ptr, left, stkpage, 4096)) {
185 S3C_PMDBG("skipping %08lx, has stack in\n", addr);
186 goto skip_check;
187 }
188
189 if (in_region(ptr, left, crcs, crc_size)) {
190 S3C_PMDBG("skipping %08lx, has crc block in\n", addr);
191 goto skip_check;
192 }
193
194 if (in_region(ptr, left, save_at, 32*4 )) {
195 S3C_PMDBG("skipping %08lx, has save block in\n", addr);
196 goto skip_check;
197 }
198
199
200
201 calc = crc32_le(~0, ptr, left);
202 if (calc != *val) {
203 printk(KERN_ERR "Restore CRC error at "
204 "%08lx (%08x vs %08x)\n", addr, calc, *val);
205
206 S3C_PMDBG("Restore CRC error at %08lx (%08x vs %08x)\n",
207 addr, calc, *val);
208 }
209
210 skip_check:
211 val++;
212 }
213
214 return val;
215}
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222
223void s3c_pm_check_restore(void)
224{
225 if (crcs != NULL)
226 s3c_pm_run_sysram(s3c_pm_runcheck, crcs);
227}
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237void s3c_pm_check_cleanup(void)
238{
239 kfree(crcs);
240 crcs = NULL;
241}
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243