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 0xfff0
38 /* Hardware parameters */
51 /* Fake timer functions */
52 /* Generic helpers for BCD */
53 static inline uint8_t toBCD (uint8_t value)
55 return (((value / 10) % 10) << 4) | (value % 10);
58 static inline uint8_t fromBCD (uint8_t BCD)
60 return ((BCD >> 4) * 10) + (BCD & 0x0F);
63 /* RTC management helpers */
64 static void get_time (m48t08_t *NVRAM, struct tm *tm)
68 t = time(NULL) + NVRAM->time_offset;
70 memcpy(tm,localtime(&t),sizeof(*tm));
72 localtime_r (&t, tm) ;
76 static void set_time (m48t08_t *NVRAM, struct tm *tm)
80 new_time = mktime(tm);
82 NVRAM->time_offset = new_time - now;
85 /* Direct access to NVRAM */
86 void m48t08_write (m48t08_t *NVRAM, uint32_t val)
91 if (NVRAM->addr > NVRAM_MAX_MEM && NVRAM->addr < 0x2000)
92 NVRAM_PRINTF("%s: 0x%08x => 0x%08x\n", __func__, NVRAM->addr, val);
93 switch (NVRAM->addr) {
96 NVRAM->buffer[0x1FF8] = (val & ~0xA0) | 0x90;
100 tmp = fromBCD(val & 0x7F);
101 if (tmp >= 0 && tmp <= 59) {
102 get_time(NVRAM, &tm);
104 set_time(NVRAM, &tm);
106 if ((val & 0x80) ^ (NVRAM->buffer[0x1FF9] & 0x80)) {
108 NVRAM->stop_time = time(NULL);
110 NVRAM->time_offset += NVRAM->stop_time - time(NULL);
111 NVRAM->stop_time = 0;
114 NVRAM->buffer[0x1FF9] = val & 0x80;
118 tmp = fromBCD(val & 0x7F);
119 if (tmp >= 0 && tmp <= 59) {
120 get_time(NVRAM, &tm);
122 set_time(NVRAM, &tm);
127 tmp = fromBCD(val & 0x3F);
128 if (tmp >= 0 && tmp <= 23) {
129 get_time(NVRAM, &tm);
131 set_time(NVRAM, &tm);
135 /* day of the week / century */
136 tmp = fromBCD(val & 0x07);
137 get_time(NVRAM, &tm);
139 set_time(NVRAM, &tm);
140 NVRAM->buffer[0x1FFC] = val & 0x40;
144 tmp = fromBCD(val & 0x1F);
146 get_time(NVRAM, &tm);
148 set_time(NVRAM, &tm);
153 tmp = fromBCD(val & 0x1F);
154 if (tmp >= 1 && tmp <= 12) {
155 get_time(NVRAM, &tm);
157 set_time(NVRAM, &tm);
163 if (tmp >= 0 && tmp <= 99) {
164 get_time(NVRAM, &tm);
165 tm.tm_year = fromBCD(val);
166 set_time(NVRAM, &tm);
170 /* Check lock registers state */
171 if (NVRAM->addr >= 0x20 && NVRAM->addr <= 0x2F && (NVRAM->lock & 1))
173 if (NVRAM->addr >= 0x30 && NVRAM->addr <= 0x3F && (NVRAM->lock & 2))
175 if (NVRAM->addr < NVRAM_MAX_MEM ||
176 (NVRAM->addr > 0x1FFF && NVRAM->addr < NVRAM->size)) {
177 NVRAM->buffer[NVRAM->addr] = val & 0xFF;
183 uint32_t m48t08_read (m48t08_t *NVRAM)
186 uint32_t retval = 0xFF;
188 switch (NVRAM->addr) {
194 get_time(NVRAM, &tm);
195 retval = (NVRAM->buffer[0x1FF9] & 0x80) | toBCD(tm.tm_sec);
199 get_time(NVRAM, &tm);
200 retval = toBCD(tm.tm_min);
204 get_time(NVRAM, &tm);
205 retval = toBCD(tm.tm_hour);
208 /* day of the week / century */
209 get_time(NVRAM, &tm);
210 retval = NVRAM->buffer[0x1FFC] | tm.tm_wday;
214 get_time(NVRAM, &tm);
215 retval = toBCD(tm.tm_mday);
219 get_time(NVRAM, &tm);
220 retval = toBCD(tm.tm_mon + 1);
224 get_time(NVRAM, &tm);
225 retval = toBCD(tm.tm_year);
228 /* Check lock registers state */
229 if (NVRAM->addr >= 0x20 && NVRAM->addr <= 0x2F && (NVRAM->lock & 1))
231 if (NVRAM->addr >= 0x30 && NVRAM->addr <= 0x3F && (NVRAM->lock & 2))
233 if (NVRAM->addr < NVRAM_MAX_MEM ||
234 (NVRAM->addr > 0x1FFF && NVRAM->addr < NVRAM->size)) {
236 retval = NVRAM->buffer[NVRAM->addr];
240 if (NVRAM->addr > NVRAM_MAX_MEM + 1 && NVRAM->addr < 0x2000)
241 NVRAM_PRINTF("0x%08x <= 0x%08x\n", NVRAM->addr, retval);
246 void m48t08_set_addr (m48t08_t *NVRAM, uint32_t addr)
251 void m48t08_toggle_lock (m48t08_t *NVRAM, int lock)
253 NVRAM->lock ^= 1 << lock;
256 static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
258 m48t08_t *NVRAM = opaque;
260 addr -= NVRAM->mem_base;
261 if (addr < NVRAM_MAX_MEM)
262 NVRAM->buffer[addr] = value;
265 static void nvram_writew (void *opaque, target_phys_addr_t addr, uint32_t value)
267 m48t08_t *NVRAM = opaque;
269 addr -= NVRAM->mem_base;
270 if (addr < NVRAM_MAX_MEM) {
271 NVRAM->buffer[addr] = value >> 8;
272 NVRAM->buffer[addr + 1] = value;
276 static void nvram_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
278 m48t08_t *NVRAM = opaque;
280 addr -= NVRAM->mem_base;
281 if (addr < NVRAM_MAX_MEM) {
282 NVRAM->buffer[addr] = value >> 24;
283 NVRAM->buffer[addr + 1] = value >> 16;
284 NVRAM->buffer[addr + 2] = value >> 8;
285 NVRAM->buffer[addr + 3] = value;
289 static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
291 m48t08_t *NVRAM = opaque;
294 addr -= NVRAM->mem_base;
295 if (addr < NVRAM_MAX_MEM)
296 retval = NVRAM->buffer[addr];
301 static uint32_t nvram_readw (void *opaque, target_phys_addr_t addr)
303 m48t08_t *NVRAM = opaque;
306 addr -= NVRAM->mem_base;
307 if (addr < NVRAM_MAX_MEM) {
308 retval = NVRAM->buffer[addr] << 8;
309 retval |= NVRAM->buffer[addr + 1];
315 static uint32_t nvram_readl (void *opaque, target_phys_addr_t addr)
317 m48t08_t *NVRAM = opaque;
320 addr -= NVRAM->mem_base;
321 if (addr < NVRAM_MAX_MEM) {
322 retval = NVRAM->buffer[addr] << 24;
323 retval |= NVRAM->buffer[addr + 1] << 16;
324 retval |= NVRAM->buffer[addr + 2] << 8;
325 retval |= NVRAM->buffer[addr + 3];
331 static CPUWriteMemoryFunc *nvram_write[] = {
337 static CPUReadMemoryFunc *nvram_read[] = {
343 /* Initialisation routine */
344 m48t08_t *m48t08_init(uint32_t mem_base, uint16_t size, uint8_t *macaddr)
348 unsigned char tmp = 0;
350 s = qemu_mallocz(sizeof(m48t08_t));
353 s->buffer = qemu_mallocz(size);
359 s->mem_base = mem_base;
362 s->mem_index = cpu_register_io_memory(0, nvram_read, nvram_write, s);
363 cpu_register_physical_memory(mem_base, 0x4000, s->mem_index);
368 s->buffer[i++] = 0x01;
369 s->buffer[i++] = 0x80; /* Sun4m OBP */
370 memcpy(&s->buffer[i], macaddr, 6);
372 /* Calculate checksum */
373 for (i = 0x1fd8; i < 0x1fe7; i++) {
376 s->buffer[0x1fe7] = tmp;
383 unsigned char id_format; /* Format identifier (always 0x01) */
384 unsigned char id_machtype; /* Machine type */
385 unsigned char id_ethaddr[6]; /* Hardware ethernet address */
386 long id_date; /* Date of manufacture */
387 unsigned int id_sernum:24; /* Unique serial number */
388 unsigned char id_cksum; /* Checksum - xor of the data bytes */
389 unsigned char reserved[16];