[PATCH v4 08/16] aspeed/smc: support 64 bits dma dram address

[Jamin Lin via <qemu-devel@nongnu.org>]

AST2700 support the maximum dram size is 8GiB
and has a "DMA DRAM Side Address High Part(0x7C)"
register to support 64 bits dma dram address.
Add helper routines functions to compute the dma dram
address, new features and update trace-event
to support 64 bits dram address.

Signed-off-by: Troy Lee <troy_lee@aspeedtech.com>
Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
---
 hw/ssi/aspeed_smc.c         | 52 +++++++++++++++++++++++++++++++------
 hw/ssi/trace-events         |  2 +-
 include/hw/ssi/aspeed_smc.h |  1 +
 3 files changed, 46 insertions(+), 9 deletions(-)

diff --git a/hw/ssi/aspeed_smc.c b/hw/ssi/aspeed_smc.c
index ffb13a12e8..df0c63469c 100644
--- a/hw/ssi/aspeed_smc.c
+++ b/hw/ssi/aspeed_smc.c
@@ -132,6 +132,9 @@
 #define   FMC_WDT2_CTRL_BOOT_SOURCE      BIT(4) /* O: primary 1: alternate */
 #define   FMC_WDT2_CTRL_EN               BIT(0)
 
+/* DMA DRAM Side Address High Part (AST2700) */
+#define R_DMA_DRAM_ADDR_HIGH   (0x7c / 4)
+
 /* DMA Control/Status Register */
 #define R_DMA_CTRL        (0x80 / 4)
 #define   DMA_CTRL_REQUEST      (1 << 31)
@@ -187,6 +190,7 @@
  *   0x1FFFFFF: 32M bytes
  */
 #define DMA_DRAM_ADDR(asc, val)   ((val) & (asc)->dma_dram_mask)
+#define DMA_DRAM_ADDR_HIGH(val)   ((val) & 0xf)
 #define DMA_FLASH_ADDR(asc, val)  ((val) & (asc)->dma_flash_mask)
 #define DMA_LENGTH(val)         ((val) & 0x01FFFFFF)
 
@@ -207,6 +211,7 @@ static const AspeedSegments aspeed_2500_spi2_segments[];
 #define ASPEED_SMC_FEATURE_DMA       0x1
 #define ASPEED_SMC_FEATURE_DMA_GRANT 0x2
 #define ASPEED_SMC_FEATURE_WDT_CONTROL 0x4
+#define ASPEED_SMC_FEATURE_DMA_DRAM_ADDR_HIGH 0x08
 
 static inline bool aspeed_smc_has_dma(const AspeedSMCClass *asc)
 {
@@ -218,6 +223,11 @@ static inline bool aspeed_smc_has_wdt_control(const AspeedSMCClass *asc)
     return !!(asc->features & ASPEED_SMC_FEATURE_WDT_CONTROL);
 }
 
+static inline bool aspeed_smc_has_dma64(const AspeedSMCClass *asc)
+{
+    return !!(asc->features & ASPEED_SMC_FEATURE_DMA_DRAM_ADDR_HIGH);
+}
+
 #define aspeed_smc_error(fmt, ...)                                      \
     qemu_log_mask(LOG_GUEST_ERROR, "%s: " fmt "\n", __func__, ## __VA_ARGS__)
 
@@ -747,6 +757,8 @@ static uint64_t aspeed_smc_read(void *opaque, hwaddr addr, unsigned int size)
         (aspeed_smc_has_dma(asc) && addr == R_DMA_CTRL) ||
         (aspeed_smc_has_dma(asc) && addr == R_DMA_FLASH_ADDR) ||
         (aspeed_smc_has_dma(asc) && addr == R_DMA_DRAM_ADDR) ||
+        (aspeed_smc_has_dma(asc) && aspeed_smc_has_dma64(asc) &&
+         addr == R_DMA_DRAM_ADDR_HIGH) ||
         (aspeed_smc_has_dma(asc) && addr == R_DMA_LEN) ||
         (aspeed_smc_has_dma(asc) && addr == R_DMA_CHECKSUM) ||
         (addr >= R_SEG_ADDR0 &&
@@ -847,6 +859,12 @@ static bool aspeed_smc_inject_read_failure(AspeedSMCState *s)
     }
 }
 
+static uint64_t aspeed_smc_dma_dram_addr(AspeedSMCState *s)
+{
+    return s->regs[R_DMA_DRAM_ADDR] |
+        ((uint64_t) s->regs[R_DMA_DRAM_ADDR_HIGH] << 32);
+}
+
 static uint32_t aspeed_smc_dma_len(AspeedSMCState *s)
 {
     AspeedSMCClass *asc = ASPEED_SMC_GET_CLASS(s);
@@ -903,24 +921,34 @@ static void aspeed_smc_dma_checksum(AspeedSMCState *s)
 
 static void aspeed_smc_dma_rw(AspeedSMCState *s)
 {
+    AspeedSMCClass *asc = ASPEED_SMC_GET_CLASS(s);
+    uint64_t dma_dram_offset;
+    uint64_t dma_dram_addr;
     MemTxResult result;
     uint32_t dma_len;
     uint32_t data;
 
     dma_len = aspeed_smc_dma_len(s);
+    dma_dram_addr = aspeed_smc_dma_dram_addr(s);
+
+    if (aspeed_smc_has_dma64(asc)) {
+        dma_dram_offset = dma_dram_addr - s->dram_base;
+    } else {
+        dma_dram_offset = dma_dram_addr;
+    }
 
     trace_aspeed_smc_dma_rw(s->regs[R_DMA_CTRL] & DMA_CTRL_WRITE ?
                             "write" : "read",
                             s->regs[R_DMA_FLASH_ADDR],
-                            s->regs[R_DMA_DRAM_ADDR],
+                            dma_dram_offset,
                             dma_len);
     while (dma_len) {
         if (s->regs[R_DMA_CTRL] & DMA_CTRL_WRITE) {
-            data = address_space_ldl_le(&s->dram_as, s->regs[R_DMA_DRAM_ADDR],
+            data = address_space_ldl_le(&s->dram_as, dma_dram_offset,
                                         MEMTXATTRS_UNSPECIFIED, &result);
             if (result != MEMTX_OK) {
-                aspeed_smc_error("DRAM read failed @%08x",
-                                 s->regs[R_DMA_DRAM_ADDR]);
+                aspeed_smc_error("DRAM read failed @%" PRIx64,
+                                 dma_dram_offset);
                 return;
             }
 
@@ -940,11 +968,11 @@ static void aspeed_smc_dma_rw(AspeedSMCState *s)
                 return;
             }
 
-            address_space_stl_le(&s->dram_as, s->regs[R_DMA_DRAM_ADDR],
+            address_space_stl_le(&s->dram_as, dma_dram_offset,
                                  data, MEMTXATTRS_UNSPECIFIED, &result);
             if (result != MEMTX_OK) {
-                aspeed_smc_error("DRAM write failed @%08x",
-                                 s->regs[R_DMA_DRAM_ADDR]);
+                aspeed_smc_error("DRAM write failed @%" PRIx64,
+                                 dma_dram_offset);
                 return;
             }
         }
@@ -953,8 +981,12 @@ static void aspeed_smc_dma_rw(AspeedSMCState *s)
          * When the DMA is on-going, the DMA registers are updated
          * with the current working addresses and length.
          */
+        dma_dram_offset += 4;
+        dma_dram_addr += 4;
+
+        s->regs[R_DMA_DRAM_ADDR_HIGH] = dma_dram_addr >> 32;
+        s->regs[R_DMA_DRAM_ADDR] = dma_dram_addr & 0xffffffff;
         s->regs[R_DMA_FLASH_ADDR] += 4;
-        s->regs[R_DMA_DRAM_ADDR] += 4;
         dma_len -= 4;
         s->regs[R_DMA_LEN] = dma_len;
         s->regs[R_DMA_CHECKSUM] += data;
@@ -1107,6 +1139,9 @@ static void aspeed_smc_write(void *opaque, hwaddr addr, uint64_t data,
     } else if (aspeed_smc_has_dma(asc) && addr == R_DMA_LEN &&
                aspeed_smc_dma_granted(s)) {
         s->regs[addr] = DMA_LENGTH(value);
+    } else if (aspeed_smc_has_dma(asc) && aspeed_smc_has_dma64(asc) &&
+               addr == R_DMA_DRAM_ADDR_HIGH) {
+        s->regs[addr] = DMA_DRAM_ADDR_HIGH(value);
     } else {
         qemu_log_mask(LOG_UNIMP, "%s: not implemented: 0x%" HWADDR_PRIx "\n",
                       __func__, addr);
@@ -1239,6 +1274,7 @@ static const VMStateDescription vmstate_aspeed_smc = {
 
 static Property aspeed_smc_properties[] = {
     DEFINE_PROP_BOOL("inject-failure", AspeedSMCState, inject_failure, false),
+    DEFINE_PROP_UINT64("dram-base", AspeedSMCState, dram_base, 0),
     DEFINE_PROP_LINK("dram", AspeedSMCState, dram_mr,
                      TYPE_MEMORY_REGION, MemoryRegion *),
     DEFINE_PROP_END_OF_LIST(),
diff --git a/hw/ssi/trace-events b/hw/ssi/trace-events
index 2d5bd2b83d..7b5ad6a939 100644
--- a/hw/ssi/trace-events
+++ b/hw/ssi/trace-events
@@ -6,7 +6,7 @@ aspeed_smc_do_snoop(int cs, int index, int dummies, int data) "CS%d index:0x%x d
 aspeed_smc_flash_write(int cs, uint64_t addr,  uint32_t size, uint64_t data, int mode) "CS%d @0x%" PRIx64 " size %u: 0x%" PRIx64" mode:%d"
 aspeed_smc_read(uint64_t addr,  uint32_t size, uint64_t data) "@0x%" PRIx64 " size %u: 0x%" PRIx64
 aspeed_smc_dma_checksum(uint32_t addr, uint32_t data) "0x%08x: 0x%08x"
-aspeed_smc_dma_rw(const char *dir, uint32_t flash_addr, uint32_t dram_addr, uint32_t size) "%s flash:@0x%08x dram:@0x%08x size:0x%08x"
+aspeed_smc_dma_rw(const char *dir, uint32_t flash_addr, uint64_t dram_addr, uint32_t size) "%s flash:@0x%08x dram:@0x%" PRIx64 " size:0x%08x"
 aspeed_smc_write(uint64_t addr,  uint32_t size, uint64_t data) "@0x%" PRIx64 " size %u: 0x%" PRIx64
 aspeed_smc_flash_select(int cs, const char *prefix) "CS%d %sselect"
 
diff --git a/include/hw/ssi/aspeed_smc.h b/include/hw/ssi/aspeed_smc.h
index f359ed22cc..fb36c386c0 100644
--- a/include/hw/ssi/aspeed_smc.h
+++ b/include/hw/ssi/aspeed_smc.h
@@ -76,6 +76,7 @@ struct AspeedSMCState {
     AddressSpace flash_as;
     MemoryRegion *dram_mr;
     AddressSpace dram_as;
+    uint64_t dram_base;
 
     AspeedSMCFlash flashes[ASPEED_SMC_CS_MAX];
 
-- 
2.25.1