2  * QEMU EEPROM 93xx emulation
28  * eeprom93xx_new   - add a new EEPROM (with 16, 64 or 256 words)
29  * eeprom93xx_free  - destroy EEPROM
30  * eeprom93xx_read  - read data from the EEPROM
31  * eeprom93xx_write - write data to the EEPROM
32  * eeprom93xx_data  - get EEPROM data array for external manipulation
35  * - No emulation of EEPROM timings.
43 /* Debug EEPROM emulation. */
47 #define logout(fmt, ...) fprintf(stderr, "EEPROM\t%-24s" fmt, __func__, ## __VA_ARGS__)
92 /* Code for saving and restoring of EEPROM state. */
131     .name = "eeprom",
155 void eeprom93xx_write(eeprom_t *eeprom, int eecs, int eesk, int eedi)  in eeprom93xx_write()  argument
157     uint8_t tick = eeprom->tick;  in eeprom93xx_write()
158     uint8_t eedo = eeprom->eedo;  in eeprom93xx_write()
159     uint16_t address = eeprom->address;  in eeprom93xx_write()
160     uint8_t command = eeprom->command;  in eeprom93xx_write()
165     if (!eeprom->eecs && eecs) {  in eeprom93xx_write()
171     } else if (eeprom->eecs && !eecs) {  in eeprom93xx_write()
173         if (eeprom->writable) {  in eeprom93xx_write()
174             uint8_t subcommand = address >> (eeprom->addrbits - 2);  in eeprom93xx_write()
177                 for (address = 0; address < eeprom->size; address++) {  in eeprom93xx_write()
178                     eeprom->contents[address] = 0xffff;  in eeprom93xx_write()
182                 eeprom->contents[address] = 0xffff;  in eeprom93xx_write()
183             } else if (tick >= 2 + 2 + eeprom->addrbits + 16) {  in eeprom93xx_write()
186                     eeprom->contents[address] &= eeprom->data;  in eeprom93xx_write()
189                     for (address = 0; address < eeprom->size; address++) {  in eeprom93xx_write()
190                         eeprom->contents[address] &= eeprom->data;  in eeprom93xx_write()
197     } else if (eecs && !eeprom->eesk && eesk) {  in eeprom93xx_write()
224         } else if (tick < 2 + 2 + eeprom->addrbits) {  in eeprom93xx_write()
228             if (tick == 2 + 2 + eeprom->addrbits) {  in eeprom93xx_write()
230                        opstring[command], address, eeprom->contents[address]);  in eeprom93xx_write()
234                 address = address % eeprom->size;  in eeprom93xx_write()
237                     switch (address >> (eeprom->addrbits - 2)) {  in eeprom93xx_write()
240                         eeprom->writable = 0;  in eeprom93xx_write()
250                         eeprom->writable = 1;  in eeprom93xx_write()
255                     eeprom->data = eeprom->contents[address];  in eeprom93xx_write()
258         } else if (tick < 2 + 2 + eeprom->addrbits + 16) {  in eeprom93xx_write()
263                 eedo = ((eeprom->data & 0x8000) != 0);  in eeprom93xx_write()
265             eeprom->data <<= 1;  in eeprom93xx_write()
266             eeprom->data += eedi;  in eeprom93xx_write()
271     /* Save status of EEPROM. */  in eeprom93xx_write()
272     eeprom->tick = tick;  in eeprom93xx_write()
273     eeprom->eecs = eecs;  in eeprom93xx_write()
274     eeprom->eesk = eesk;  in eeprom93xx_write()
275     eeprom->eedo = eedo;  in eeprom93xx_write()
276     eeprom->address = address;  in eeprom93xx_write()
277     eeprom->command = command;  in eeprom93xx_write()
280 uint16_t eeprom93xx_read(eeprom_t *eeprom)  in eeprom93xx_read()  argument
283     logout("CS=%u DO=%u\n", eeprom->eecs, eeprom->eedo);  in eeprom93xx_read()
284     return eeprom->eedo;  in eeprom93xx_read()
288 void eeprom93xx_reset(eeprom_t *eeprom)
290     /* prepare eeprom */
291     logout("eeprom = 0x%p\n", eeprom);
292     eeprom->tick = 0;
293     eeprom->command = 0;
299     /* Add a new EEPROM (with 16, 64 or 256 words). */  in eeprom93xx_new()
300     eeprom_t *eeprom;  in eeprom93xx_new()  local
313         assert(!"Unsupported EEPROM size, fallback to 64 words!");  in eeprom93xx_new()
318     eeprom = g_malloc0(sizeof(*eeprom) + nwords * 2);  in eeprom93xx_new()
319     eeprom->size = nwords;  in eeprom93xx_new()
320     eeprom->addrbits = addrbits;  in eeprom93xx_new()
322     eeprom->eedo = 1;  in eeprom93xx_new()
323     logout("eeprom = 0x%p, nwords = %u\n", eeprom, nwords);  in eeprom93xx_new()
324     vmstate_register_any(VMSTATE_IF(dev), &vmstate_eeprom, eeprom);  in eeprom93xx_new()
325     return eeprom;  in eeprom93xx_new()
328 void eeprom93xx_free(DeviceState *dev, eeprom_t *eeprom)  in eeprom93xx_free()  argument
330     /* Destroy EEPROM. */  in eeprom93xx_free()
331     logout("eeprom = 0x%p\n", eeprom);  in eeprom93xx_free()
332     vmstate_unregister(VMSTATE_IF(dev), &vmstate_eeprom, eeprom);  in eeprom93xx_free()
333     g_free(eeprom);  in eeprom93xx_free()
336 uint16_t *eeprom93xx_data(eeprom_t *eeprom)  in eeprom93xx_data()  argument
338     /* Get EEPROM data array. */  in eeprom93xx_data()
339     return &eeprom->contents[0];  in eeprom93xx_data()