static uint32_t m25p80_transfer8(SSISlave *ss, uint32_t tx)
{
Flash *s = M25P80(ss);
uint32_t r = 0;
switch (s->state) {
case STATE_PAGE_PROGRAM:
DB_PRINT_L(1, "page program cur_addr=%#" PRIx32 " data=%" PRIx8 "\n",
s->cur_addr, (uint8_t)tx);
flash_write8(s, s->cur_addr, (uint8_t)tx);
s->cur_addr = (s->cur_addr + 1) & (s->size - 1);
break;
case STATE_READ:
r = s->storage[s->cur_addr];
DB_PRINT_L(1, "READ 0x%" PRIx32 "=%" PRIx8 "\n", s->cur_addr,
(uint8_t)r);
s->cur_addr = (s->cur_addr + 1) & (s->size - 1);
break;
case STATE_COLLECTING_DATA:
case STATE_COLLECTING_VAR_LEN_DATA:
s->data[s->len] = (uint8_t)tx;
s->len++;
if (s->len == s->needed_bytes) {
complete_collecting_data(s);
}
break;
case STATE_READING_DATA:
r = s->data[s->pos];
s->pos++;
if (s->pos == s->len) {
s->pos = 0;
s->state = STATE_IDLE;
}
break;
default:
case STATE_IDLE:
decode_new_cmd(s, (uint8_t)tx);
break;
}
return r;
}
static uint32_t m25p80_transfer8(SSISlave *ss, uint32_t tx)
{
Flash *s = M25P80(ss);
uint32_t r = 0;
switch (s->state) {
case STATE_PAGE_PROGRAM:
DB_PRINT_L(1, "page program cur_addr=%#" PRIx32 " data=%" PRIx8 "\n",
s->cur_addr, (uint8_t)tx);
flash_write8(s, s->cur_addr, (uint8_t)tx);
s->cur_addr = (s->cur_addr + 1) & (s->size - 1);
break;
case STATE_READ:
r = s->storage[s->cur_addr];
DB_PRINT_L(1, "READ 0x%" PRIx32 "=%" PRIx8 "\n", s->cur_addr,
(uint8_t)r);
s->cur_addr = (s->cur_addr + 1) & (s->size - 1);
break;
case STATE_COLLECTING_DATA:
case STATE_COLLECTING_VAR_LEN_DATA:
if (s->len >= M25P80_INTERNAL_DATA_BUFFER_SZ) {
qemu_log_mask(LOG_GUEST_ERROR,
"M25P80: Write overrun internal data buffer. "
"SPI controller (QEMU emulator or guest driver) "
"is misbehaving\n");
s->len = s->pos = 0;
s->state = STATE_IDLE;
break;
}
s->data[s->len] = (uint8_t)tx;
s->len++;
if (s->len == s->needed_bytes) {
complete_collecting_data(s);
}
break;
case STATE_READING_DATA:
if (s->pos >= M25P80_INTERNAL_DATA_BUFFER_SZ) {
qemu_log_mask(LOG_GUEST_ERROR,
"M25P80: Read overrun internal data buffer. "
"SPI controller (QEMU emulator or guest driver) "
"is misbehaving\n");
s->len = s->pos = 0;
s->state = STATE_IDLE;
break;
}
r = s->data[s->pos];
s->pos++;
if (s->pos == s->len) {
s->pos = 0;
if (!s->data_read_loop) {
s->state = STATE_IDLE;
}
}
break;
default:
case STATE_IDLE:
decode_new_cmd(s, (uint8_t)tx);
break;
}
return r;
}