[PATCH v1 02/14] hw/ssi/aspeed_smc: Fix AST2700 DMA flash address mask

[Jamin Lin <jamin_lin@aspeedtech.com>]

The DMA flash address register (SPI084) holds the offset of the
flash access within the controller's flash window. The AST2700 FMC,
SPI0 and SPI1 controllers use a dma_flash_mask of 0x2FFFFFFC, which
clears bit 28, and SPI2 uses 0x0FFFFFFC, which limits DMA to the
first 256MB of the window.

With the default segment layout, FMC CS2 is mapped at offset
0x10000000. A DMA read from that offset is masked to 0x0 and returns
data from CS0 instead of CS2.

The Linux driver programs SPI084 with the window offset masked by
0x7fffffff, so bit 28 is a valid address bit.

Set dma_flash_mask to 0x3FFFFFFC for all AST2700 controllers to cover
the full 1GB flash window.

Fixes: bdb3748dba30 ("aspeed/smc: Add AST2700 support")
Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
---
 hw/ssi/aspeed_smc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/hw/ssi/aspeed_smc.c b/hw/ssi/aspeed_smc.c
index 10ea9e5aa0..c0c3666dbc 100644
--- a/hw/ssi/aspeed_smc.c
+++ b/hw/ssi/aspeed_smc.c
@@ -1952,7 +1952,7 @@ static void aspeed_2700_fmc_class_init(ObjectClass *klass, const void *data)
     asc->features          = ASPEED_SMC_FEATURE_DMA |
                              ASPEED_SMC_FEATURE_DMA_DRAM_ADDR_HIGH |
                              ASPEED_SMC_FEATURE_DATA_FIFO;
-    asc->dma_flash_mask    = 0x2FFFFFFC;
+    asc->dma_flash_mask    = 0x3FFFFFFC;
     asc->dma_dram_mask     = 0xFFFFFFFC;
     asc->dma_start_length  = 1;
     asc->nregs             = (0x200 + (asc->cs_num_max * 0x10)) >> 2;
@@ -1989,7 +1989,7 @@ static void aspeed_2700_spi0_class_init(ObjectClass *klass, const void *data)
     asc->features          = ASPEED_SMC_FEATURE_DMA |
                              ASPEED_SMC_FEATURE_DMA_DRAM_ADDR_HIGH |
                              ASPEED_SMC_FEATURE_DATA_FIFO;
-    asc->dma_flash_mask    = 0x2FFFFFFC;
+    asc->dma_flash_mask    = 0x3FFFFFFC;
     asc->dma_dram_mask     = 0xFFFFFFFC;
     asc->dma_start_length  = 1;
     asc->nregs             = (0x200 + (asc->cs_num_max * 0x10)) >> 2;
@@ -2025,7 +2025,7 @@ static void aspeed_2700_spi1_class_init(ObjectClass *klass, const void *data)
     asc->features          = ASPEED_SMC_FEATURE_DMA |
                              ASPEED_SMC_FEATURE_DMA_DRAM_ADDR_HIGH |
                              ASPEED_SMC_FEATURE_DATA_FIFO;
-    asc->dma_flash_mask    = 0x2FFFFFFC;
+    asc->dma_flash_mask    = 0x3FFFFFFC;
     asc->dma_dram_mask     = 0xFFFFFFFC;
     asc->dma_start_length  = 1;
     asc->nregs             = (0x200 + (asc->cs_num_max * 0x10)) >> 2;
@@ -2061,7 +2061,7 @@ static void aspeed_2700_spi2_class_init(ObjectClass *klass, const void *data)
     asc->features          = ASPEED_SMC_FEATURE_DMA |
                              ASPEED_SMC_FEATURE_DMA_DRAM_ADDR_HIGH |
                              ASPEED_SMC_FEATURE_DATA_FIFO;
-    asc->dma_flash_mask    = 0x0FFFFFFC;
+    asc->dma_flash_mask    = 0x3FFFFFFC;
     asc->dma_dram_mask     = 0xFFFFFFFC;
     asc->dma_start_length  = 1;
     asc->nregs             = (0x200 + (asc->cs_num_max * 0x10)) >> 2;
-- 
2.53.0