aspeed/scu: Implement chip ID register

This returns a fixed but non-zero value for the chip id.
Signed-off-by: NJoel Stanley <joel@jms.id.au>
Reviewed-by: NAndrew Jeffery <andrew@aj.id.au>
Reviewed-by: NCédric Le Goater <clg@kaod.org>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20200121013302.43839-3-joel@jms.id.au
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/misc/aspeed_scu.c

@@ -77,6 +77,8 @@
 #define CPU2_BASE_SEG4       TO_REG(0x110)
 #define CPU2_BASE_SEG5       TO_REG(0x114)
 #define CPU2_CACHE_CTRL      TO_REG(0x118)
+#define CHIP_ID0             TO_REG(0x150)
+#define CHIP_ID1             TO_REG(0x154)
 #define UART_HPLL_CLK        TO_REG(0x160)
 #define PCIE_CTRL            TO_REG(0x180)
 #define BMC_MMIO_CTRL        TO_REG(0x184)
@@ -115,6 +117,8 @@
 #define AST2600_HW_STRAP2_PROT    TO_REG(0x518)
 #define AST2600_RNG_CTRL          TO_REG(0x524)
 #define AST2600_RNG_DATA          TO_REG(0x540)
+#define AST2600_CHIP_ID0          TO_REG(0x5B0)
+#define AST2600_CHIP_ID1          TO_REG(0x5B4)
 
 #define AST2600_CLK TO_REG(0x40)
 
@@ -182,6 +186,8 @@ static const uint32_t ast2500_a1_resets[ASPEED_SCU_NR_REGS] = {
      [CPU2_BASE_SEG1]  = 0x80000000U,
      [CPU2_BASE_SEG4]  = 0x1E600000U,
      [CPU2_BASE_SEG5]  = 0xC0000000U,
+     [CHIP_ID0]        = 0x1234ABCDU,
+     [CHIP_ID1]        = 0x88884444U,
      [UART_HPLL_CLK]   = 0x00001903U,
      [PCIE_CTRL]       = 0x0000007BU,
      [BMC_DEV_ID]      = 0x00002402U
@@ -307,6 +313,8 @@ static void aspeed_ast2500_scu_write(void *opaque, hwaddr offset,
     case RNG_DATA:
     case FREE_CNTR4:
     case FREE_CNTR4_EXT:
+    case CHIP_ID0:
+    case CHIP_ID1:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Write to read-only offset 0x%" HWADDR_PRIx "\n",
                       __func__, offset);
@@ -620,6 +628,8 @@ static void aspeed_ast2600_scu_write(void *opaque, hwaddr offset,
     case AST2600_RNG_DATA:
     case AST2600_SILICON_REV:
     case AST2600_SILICON_REV2:
+    case AST2600_CHIP_ID0:
+    case AST2600_CHIP_ID1:
         /* Add read only registers here */
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Write to read-only offset 0x%" HWADDR_PRIx "\n",
@@ -648,6 +658,9 @@ static const uint32_t ast2600_a0_resets[ASPEED_AST2600_SCU_NR_REGS] = {
     [AST2600_CLK_STOP_CTRL2]    = 0xFFF0FFF0,
     [AST2600_SDRAM_HANDSHAKE]   = 0x00000040,  /* SoC completed DRAM init */
     [AST2600_HPLL_PARAM]        = 0x1000405F,
+    [AST2600_CHIP_ID0]          = 0x1234ABCD,
+    [AST2600_CHIP_ID1]          = 0x88884444,
+
 };
 
 static void aspeed_ast2600_scu_reset(DeviceState *dev)