hw/i2c/aspeed: Add support for Tx/Rx buffer 64 bit addresses

ASPEED AST2700 SOC is a 64 bits quad core CPUs (Cortex-a35)
and the base address of dram is "0x4 00000000" which
is 64bits address.

It has "Master DMA Mode Tx Buffer Base Address[39:32](0x60)"
and "Master DMA Mode Rx Buffer Base Address[39:32](0x64)"
registers to save the high part physical address of Tx/Rx
buffer address for master mode.

It has "Slave DMA Mode Tx Buffer Base Address[39:32](0x68)" and
"Slave DMA Mode Rx Buffer Base Address[39:32](0x6C)" registers
to save the high part physical address of Tx/Rx buffer address
for slave mode.

Ex: Tx buffer address for master mode [39:0]
The "Master DMA Mode Tx Buffer Base Address[39:32](0x60)"
bits [7:0] which corresponds the bits [39:32] of the 64 bits address of
the Tx buffer address.
The "Master DMA Mode Tx Buffer Base Address(0x30)" bits [31:0]
which corresponds the bits [31:0] of the 64 bits address
of the Tx buffer address.

Introduce a new has_dma64 class attribute and new registers for the
new mode to support DMA 64 bits dram address.
Update new mode register number to 28.

The aspeed_i2c_bus_vmstate is changed again and
version is not increased because it was done earlier in the same series.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>

hw/i2c/aspeed_i2c.c

@@ -140,6 +140,7 @@ static uint64_t aspeed_i2c_bus_old_read(AspeedI2CBus *bus, hwaddr offset,
 static uint64_t aspeed_i2c_bus_new_read(AspeedI2CBus *bus, hwaddr offset,
                                         unsigned size)
 {
+    AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller);
     uint64_t value = bus->regs[offset / sizeof(*bus->regs)];
 
     switch (offset) {
@@ -170,6 +171,16 @@ static uint64_t aspeed_i2c_bus_new_read(AspeedI2CBus *bus, hwaddr offset,
     case A_I2CM_CMD:
         value = SHARED_FIELD_DP32(value, BUS_BUSY_STS, i2c_bus_busy(bus->bus));
         break;
+    case A_I2CM_DMA_TX_ADDR_HI:
+    case A_I2CM_DMA_RX_ADDR_HI:
+    case A_I2CS_DMA_TX_ADDR_HI:
+    case A_I2CS_DMA_RX_ADDR_HI:
+        if (!aic->has_dma64) {
+            qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA 64 bits support\n",
+            __func__);
+            value = -1;
+        }
+        break;
     default:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, offset);
@@ -731,6 +742,42 @@ static void aspeed_i2c_bus_new_write(AspeedI2CBus *bus, hwaddr offset,
         qemu_log_mask(LOG_UNIMP, "%s: Slave mode DMA TX is not implemented\n",
                       __func__);
         break;
+
+    case A_I2CM_DMA_TX_ADDR_HI:
+        if (!aic->has_dma64) {
+            qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA 64 bits support\n",
+                          __func__);
+            break;
+        }
+        bus->regs[R_I2CM_DMA_TX_ADDR_HI] = FIELD_EX32(value,
+                                                      I2CM_DMA_TX_ADDR_HI,
+                                                      ADDR_HI);
+        break;
+    case A_I2CM_DMA_RX_ADDR_HI:
+        if (!aic->has_dma64) {
+            qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA 64 bits support\n",
+                          __func__);
+            break;
+        }
+        bus->regs[R_I2CM_DMA_RX_ADDR_HI] = FIELD_EX32(value,
+                                                      I2CM_DMA_RX_ADDR_HI,
+                                                      ADDR_HI);
+        break;
+    case A_I2CS_DMA_TX_ADDR_HI:
+        qemu_log_mask(LOG_UNIMP,
+                      "%s: Slave mode DMA TX Addr high is not implemented\n",
+                      __func__);
+        break;
+    case A_I2CS_DMA_RX_ADDR_HI:
+        if (!aic->has_dma64) {
+            qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA 64 bits support\n",
+                          __func__);
+            break;
+        }
+        bus->regs[R_I2CS_DMA_RX_ADDR_HI] = FIELD_EX32(value,
+                                                      I2CS_DMA_RX_ADDR_HI,
+                                                      ADDR_HI);
+        break;
     default:
         qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
                       __func__, offset);
@@ -1554,6 +1601,7 @@ static void aspeed_2700_i2c_class_init(ObjectClass *klass, void *data)
     aic->bus_pool_base = aspeed_2500_i2c_bus_pool_base;
     aic->has_dma = true;
     aic->mem_size = 0x2000;
+    aic->has_dma64 = true;
 }
 
 static const TypeInfo aspeed_2700_i2c_info = {

include/hw/i2c/aspeed_i2c.h

@@ -38,7 +38,7 @@ OBJECT_DECLARE_TYPE(AspeedI2CState, AspeedI2CClass, ASPEED_I2C)
 #define ASPEED_I2C_SHARE_POOL_SIZE 0x800
 #define ASPEED_I2C_BUS_POOL_SIZE 0x20
 #define ASPEED_I2C_OLD_NUM_REG 11
-#define ASPEED_I2C_NEW_NUM_REG 22
+#define ASPEED_I2C_NEW_NUM_REG 28
 
 #define A_I2CD_M_STOP_CMD       BIT(5)
 #define A_I2CD_M_RX_CMD         BIT(3)
@@ -227,6 +227,15 @@ REG32(I2CS_DMA_LEN_STS, 0x4c)
     FIELD(I2CS_DMA_LEN_STS, TX_LEN, 0, 13)
 REG32(I2CC_DMA_ADDR, 0x50)
 REG32(I2CC_DMA_LEN, 0x54)
+/* DMA 64bits */
+REG32(I2CM_DMA_TX_ADDR_HI, 0x60)
+    FIELD(I2CM_DMA_TX_ADDR_HI, ADDR_HI, 0, 7)
+REG32(I2CM_DMA_RX_ADDR_HI, 0x64)
+    FIELD(I2CM_DMA_RX_ADDR_HI, ADDR_HI, 0, 7)
+REG32(I2CS_DMA_TX_ADDR_HI, 0x68)
+    FIELD(I2CS_DMA_TX_ADDR_HI, ADDR_HI, 0, 7)
+REG32(I2CS_DMA_RX_ADDR_HI, 0x6c)
+    FIELD(I2CS_DMA_RX_ADDR_HI, ADDR_HI, 0, 7)
 
 struct AspeedI2CState;
 
@@ -292,6 +301,7 @@ struct AspeedI2CClass {
     bool has_dma;
     bool has_share_pool;
     uint64_t mem_size;
+    bool has_dma64;
 };
 
 static inline bool aspeed_i2c_is_new_mode(AspeedI2CState *s)