ast2400: pretend DMAs are done for U-boot

U-boot does SPI timing calibration using DMA tranfers. To let the
initialization continue, we fake success by setting the DMA status of
the Interrupt Control Register.

For the moment, DMA support is not required as it is not used in
normal operation.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-id: 1467994016-11678-4-git-send-email-clg@kaod.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/hw/ssi/aspeed_smc.c b/hw/ssi/aspeed_smc.c
index 854474b642ea5303ad0a8e3a973e19bb2d82401e..d319e04a27f01003228722ed411156f10c3c8aec 100644 (file)
--- a/hw/ssi/aspeed_smc.c
+++ b/hw/ssi/aspeed_smc.c
@@ -273,6 +273,9 @@ static void aspeed_smc_reset(DeviceState *d)
 
     memset(s->regs, 0, sizeof s->regs);
 
+    /* Pretend DMA is done (u-boot initialization) */
+    s->regs[R_INTR_CTRL] = INTR_CTRL_DMA_STATUS;
+
     /* Unselect all slaves */
     for (i = 0; i < s->num_cs; ++i) {
         s->regs[s->r_ctrl0 + i] |= CTRL_CE_STOP_ACTIVE;
@@ -297,6 +300,7 @@ static uint64_t aspeed_smc_read(void *opaque, hwaddr addr, unsigned int size)
     if (addr == s->r_conf ||
         addr == s->r_timings ||
         addr == s->r_ce_ctrl ||
+        addr == R_INTR_CTRL ||
         (addr >= s->r_ctrl0 && addr < s->r_ctrl0 + s->num_cs)) {
         return s->regs[addr];
     } else {