2 * QEMU M48T08 NVRAM emulation for Sparc platform
4 * Copyright (c) 2003-2004 Jocelyn Mayer
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
29 #if defined(DEBUG_NVRAM)
30 #define NVRAM_PRINTF(fmt, args...) do { printf(fmt , ##args); } while (0)
32 #define NVRAM_PRINTF(fmt, args...) do { } while (0)
35 #define NVRAM_MAX_MEM 0x1ff0
36 #define NVRAM_MAXADDR 0x1fff
46 /* Fake timer functions */
47 /* Generic helpers for BCD */
48 static inline uint8_t toBCD (uint8_t value
)
50 return (((value
/ 10) % 10) << 4) | (value
% 10);
53 static inline uint8_t fromBCD (uint8_t BCD
)
55 return ((BCD
>> 4) * 10) + (BCD
& 0x0F);
58 /* RTC management helpers */
59 static void get_time (m48t08_t
*NVRAM
, struct tm
*tm
)
63 t
= time(NULL
) + NVRAM
->time_offset
;
65 memcpy(tm
,localtime(&t
),sizeof(*tm
));
67 localtime_r (&t
, tm
) ;
71 static void set_time (m48t08_t
*NVRAM
, struct tm
*tm
)
75 new_time
= mktime(tm
);
77 NVRAM
->time_offset
= new_time
- now
;
80 /* Direct access to NVRAM */
81 void m48t08_write (m48t08_t
*NVRAM
, uint32_t addr
, uint8_t val
)
86 addr
&= NVRAM_MAXADDR
;
90 NVRAM
->buffer
[0x1FF8] = (val
& ~0xA0) | 0x90;
94 tmp
= fromBCD(val
& 0x7F);
95 if (tmp
>= 0 && tmp
<= 59) {
100 if ((val
& 0x80) ^ (NVRAM
->buffer
[0x1FF9] & 0x80)) {
102 NVRAM
->stop_time
= time(NULL
);
104 NVRAM
->time_offset
+= NVRAM
->stop_time
- time(NULL
);
105 NVRAM
->stop_time
= 0;
108 NVRAM
->buffer
[0x1FF9] = val
& 0x80;
112 tmp
= fromBCD(val
& 0x7F);
113 if (tmp
>= 0 && tmp
<= 59) {
114 get_time(NVRAM
, &tm
);
116 set_time(NVRAM
, &tm
);
121 tmp
= fromBCD(val
& 0x3F);
122 if (tmp
>= 0 && tmp
<= 23) {
123 get_time(NVRAM
, &tm
);
125 set_time(NVRAM
, &tm
);
129 /* day of the week / century */
130 tmp
= fromBCD(val
& 0x07);
131 get_time(NVRAM
, &tm
);
133 set_time(NVRAM
, &tm
);
134 NVRAM
->buffer
[0x1FFC] = val
& 0x40;
138 tmp
= fromBCD(val
& 0x1F);
140 get_time(NVRAM
, &tm
);
142 set_time(NVRAM
, &tm
);
147 tmp
= fromBCD(val
& 0x1F);
148 if (tmp
>= 1 && tmp
<= 12) {
149 get_time(NVRAM
, &tm
);
151 set_time(NVRAM
, &tm
);
157 if (tmp
>= 0 && tmp
<= 99) {
158 get_time(NVRAM
, &tm
);
159 tm
.tm_year
= fromBCD(val
);
160 set_time(NVRAM
, &tm
);
164 NVRAM
->buffer
[addr
] = val
& 0xFF;
169 uint8_t m48t08_read (m48t08_t
*NVRAM
, uint32_t addr
)
172 uint8_t retval
= 0xFF;
174 addr
&= NVRAM_MAXADDR
;
181 get_time(NVRAM
, &tm
);
182 retval
= (NVRAM
->buffer
[0x1FF9] & 0x80) | toBCD(tm
.tm_sec
);
186 get_time(NVRAM
, &tm
);
187 retval
= toBCD(tm
.tm_min
);
191 get_time(NVRAM
, &tm
);
192 retval
= toBCD(tm
.tm_hour
);
195 /* day of the week / century */
196 get_time(NVRAM
, &tm
);
197 retval
= NVRAM
->buffer
[0x1FFC] | tm
.tm_wday
;
201 get_time(NVRAM
, &tm
);
202 retval
= toBCD(tm
.tm_mday
);
206 get_time(NVRAM
, &tm
);
207 retval
= toBCD(tm
.tm_mon
+ 1);
211 get_time(NVRAM
, &tm
);
212 retval
= toBCD(tm
.tm_year
);
216 retval
= NVRAM
->buffer
[addr
];
222 static void nvram_writeb (void *opaque
, target_phys_addr_t addr
, uint32_t value
)
224 m48t08_t
*NVRAM
= opaque
;
226 m48t08_write(NVRAM
, addr
, value
);
229 static void nvram_writew (void *opaque
, target_phys_addr_t addr
, uint32_t value
)
231 m48t08_t
*NVRAM
= opaque
;
233 m48t08_write(NVRAM
, addr
, value
);
234 m48t08_write(NVRAM
, addr
+ 1, value
>> 8);
237 static void nvram_writel (void *opaque
, target_phys_addr_t addr
, uint32_t value
)
239 m48t08_t
*NVRAM
= opaque
;
241 m48t08_write(NVRAM
, addr
, value
);
242 m48t08_write(NVRAM
, addr
+ 1, value
>> 8);
243 m48t08_write(NVRAM
, addr
+ 2, value
>> 16);
244 m48t08_write(NVRAM
, addr
+ 3, value
>> 24);
247 static uint32_t nvram_readb (void *opaque
, target_phys_addr_t addr
)
249 m48t08_t
*NVRAM
= opaque
;
252 retval
= m48t08_read(NVRAM
, addr
);
256 static uint32_t nvram_readw (void *opaque
, target_phys_addr_t addr
)
258 m48t08_t
*NVRAM
= opaque
;
261 retval
= m48t08_read(NVRAM
, addr
) << 8;
262 retval
|= m48t08_read(NVRAM
, addr
+ 1);
266 static uint32_t nvram_readl (void *opaque
, target_phys_addr_t addr
)
268 m48t08_t
*NVRAM
= opaque
;
271 retval
= m48t08_read(NVRAM
, addr
) << 24;
272 retval
|= m48t08_read(NVRAM
, addr
+ 1) << 16;
273 retval
|= m48t08_read(NVRAM
, addr
+ 2) << 8;
274 retval
|= m48t08_read(NVRAM
, addr
+ 3);
278 static CPUWriteMemoryFunc
*nvram_write
[] = {
284 static CPUReadMemoryFunc
*nvram_read
[] = {
290 static void nvram_save(QEMUFile
*f
, void *opaque
)
292 m48t08_t
*s
= opaque
;
294 qemu_put_be32s(f
, (uint32_t *)&s
->time_offset
);
295 qemu_put_be32s(f
, (uint32_t *)&s
->stop_time
);
296 qemu_put_buffer(f
, s
->buffer
, 0x2000);
299 static int nvram_load(QEMUFile
*f
, void *opaque
, int version_id
)
301 m48t08_t
*s
= opaque
;
306 qemu_get_be32s(f
, (uint32_t *)&s
->time_offset
);
307 qemu_get_be32s(f
, (uint32_t *)&s
->stop_time
);
308 qemu_get_buffer(f
, s
->buffer
, 0x2000);
312 static void m48t08_reset(void *opaque
)
314 m48t08_t
*s
= opaque
;
321 /* Initialisation routine */
322 m48t08_t
*m48t08_init(uint32_t mem_base
, uint16_t size
)
327 s
= qemu_mallocz(sizeof(m48t08_t
));
330 s
->buffer
= qemu_mallocz(size
);
336 mem_index
= cpu_register_io_memory(0, nvram_read
, nvram_write
, s
);
337 cpu_register_physical_memory(mem_base
, 0x2000, mem_index
);
340 register_savevm("nvram", mem_base
, 1, nvram_save
, nvram_load
, s
);
341 qemu_register_reset(m48t08_reset
, s
);
348 unsigned char id_format
; /* Format identifier (always 0x01) */
349 unsigned char id_machtype
; /* Machine type */
350 unsigned char id_ethaddr
[6]; /* Hardware ethernet address */
351 long id_date
; /* Date of manufacture */
352 unsigned int id_sernum
:24; /* Unique serial number */
353 unsigned char id_cksum
; /* Checksum - xor of the data bytes */
354 unsigned char reserved
[16];