The SMC controllers have a register containing the byte that will be
used as dummy output. It can be modified by software.
Signed-off-by: Cédric Le Goater <c...@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <f4...@amsat.org>
---
hw/ssi/aspeed_smc.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/hw/ssi/aspeed_smc.c b/hw/ssi/aspeed_smc.c
index 6045ca11b969..9f3b6f4b4501 100644
--- a/hw/ssi/aspeed_smc.c
+++ b/hw/ssi/aspeed_smc.c
@@ -98,8 +98,8 @@
/* Misc Control Register #1 */
#define R_MISC_CTRL1 (0x50 / 4)
-/* Misc Control Register #2 */
-#define R_MISC_CTRL2 (0x54 / 4)
+/* SPI dummy cycle data */
+#define R_DUMMY_DATA (0x54 / 4)
/* DMA Control/Status Register */
#define R_DMA_CTRL (0x80 / 4)
@@ -529,7 +529,7 @@ static void aspeed_smc_flash_setup(AspeedSMCFlash *fl,
uint32_t addr)
*/
if (aspeed_smc_flash_mode(fl) == CTRL_FREADMODE) {
for (i = 0; i < aspeed_smc_flash_dummies(fl); i++) {
- ssi_transfer(fl->controller->spi, 0xFF);
+ ssi_transfer(fl->controller->spi, s->regs[R_DUMMY_DATA] & 0xff);
}
}
}
@@ -664,6 +664,7 @@ static uint64_t aspeed_smc_read(void *opaque, hwaddr addr,
unsigned int size)
addr == s->r_timings ||
addr == s->r_ce_ctrl ||
addr == R_INTR_CTRL ||
+ addr == R_DUMMY_DATA ||
(addr >= R_SEG_ADDR0 && addr < R_SEG_ADDR0 + s->ctrl->max_slaves) ||
(addr >= s->r_ctrl0 && addr < s->r_ctrl0 + s->ctrl->max_slaves)) {
return s->regs[addr];
@@ -697,6 +698,8 @@ static void aspeed_smc_write(void *opaque, hwaddr addr,
uint64_t data,
if (value != s->regs[R_SEG_ADDR0 + cs]) {
aspeed_smc_flash_set_segment(s, cs, value);
}
+ } else if (addr == R_DUMMY_DATA) {
+ s->regs[addr] = value & 0xff;
} else {
qemu_log_mask(LOG_UNIMP, "%s: not implemented: 0x%" HWADDR_PRIx "\n",
__func__, addr);
--
2.20.1
