[Qemu-devel] [PATCH 2/2] hw/misc: use macros to define hw-strap1 register on Aspeed SOC

["Cédric Le Goater" <clg@kaod.org>]

This gives some explanation behind the magic number 0x120CE416.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 hw/arm/palmetto-bmc.c        | 16 ++++++++-
 include/hw/misc/aspeed_scu.h | 78 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+), 1 deletion(-)

diff --git a/hw/arm/palmetto-bmc.c b/hw/arm/palmetto-bmc.c
index fcbb4f197162..8fac67617825 100644
--- a/hw/arm/palmetto-bmc.c
+++ b/hw/arm/palmetto-bmc.c
@@ -22,6 +22,19 @@
 #include "sysemu/blockdev.h"
 #include "hw/block/flash.h"
 
+#define PALMETTO_BMC_HW_STRAP1 (                                        \
+        SCU_HW_STRAP_DRAM_SIZE(DRAM_SIZE_256MB) |                       \
+        SCU_HW_STRAP_DRAM_CONFIG(2 /* DDR3 with CL=6, CWL=5 */) |       \
+        SCU_HW_STRAP_ACPI_DIS |                                         \
+        SCU_HW_STRAP_SET_CLK_SOURCE(CLK_48M_IN) |                       \
+        SCU_HW_STRAP_VGA_CLASS_CODE |                                   \
+        SCU_HW_STRAP_LPC_RESET_PIN |                                    \
+        SCU_HW_STRAP_SPI_MODE(SCU_HW_STRAP_SPI_M_S_EN) |                \
+        SCU_HW_STRAP_SET_CPU_AHB_RATIO(CPU_AHB_RATIO_2_1) |             \
+        SCU_HW_STRAP_SPI_WIDTH |                                        \
+        SCU_HW_STRAP_VGA_SIZE_SET(VGA_16M_DRAM) |                       \
+        SCU_HW_STRAP_BOOT_MODE(SPI_BOOT))
+
 static struct arm_boot_info palmetto_bmc_binfo = {
     .loader_start = AST2400_SDRAM_BASE,
     .board_id = 0,
@@ -77,7 +90,8 @@ static void palmetto_bmc_init(MachineState *machine)
                                 &bmc->ram);
     object_property_add_const_link(OBJECT(&bmc->soc), "ram", OBJECT(&bmc->ram),
                                    &error_abort);
-    object_property_set_int(OBJECT(&bmc->soc), 0x120CE416, "hw-strap1",
+    object_property_set_int(OBJECT(&bmc->soc), PALMETTO_BMC_HW_STRAP1,
+                            "hw-strap1",
                             &error_abort);
     object_property_set_bool(OBJECT(&bmc->soc), true, "realized",
                              &error_abort);
diff --git a/include/hw/misc/aspeed_scu.h b/include/hw/misc/aspeed_scu.h
index 6b8e46f85fad..92b81de309b6 100644
--- a/include/hw/misc/aspeed_scu.h
+++ b/include/hw/misc/aspeed_scu.h
@@ -31,4 +31,82 @@ typedef struct AspeedSCUState {
     uint32_t hw_strap2;
 } AspeedSCUState;
 
+/*
+ * Hardware strapping register definition
+ */
+#define SCU_HW_STRAP_SW_DEFINE(x)          (x << 29)
+#define SCU_HW_STRAP_SW_DEFINE_MASK        (0x3 << 29)
+
+#define SCU_HW_STRAP_DRAM_SIZE(x)          (x << 27)
+#define SCU_HW_STRAP_DRAM_SIZE_MASK        (0x3 << 27)
+#define     DRAM_SIZE_64MB                     0
+#define     DRAM_SIZE_128MB                    1
+#define     DRAM_SIZE_256MB                    2
+#define     DRAM_SIZE_512MB                    3
+
+#define SCU_HW_STRAP_DRAM_CONFIG(x)        (x << 24)
+#define SCU_HW_STRAP_DRAM_CONFIG_MASK      (0x7 << 24)
+
+#define SCU_HW_STRAP_GPIOE_PT_EN           (0x1 << 22)
+#define SCU_HW_STRAP_GPIOD_PT_EN           (0x1 << 21)
+#define SCU_HW_STRAP_LPC_DEC_SUPER_IO      (0x1 << 20)
+#define SCU_HW_STRAP_ACPI_DIS              (0x1 << 19)
+
+/* bit 23, 18 [1,0] */
+#define SCU_HW_STRAP_SET_CLK_SOURCE(x)     ((((x & 0x3) >> 1) << 23) | \
+                                            ((x & 0x1) << 18))
+#define SCU_HW_STRAP_GET_CLK_SOURCE(x)     (((x >> 23) & 0x1 << 1) | \
+                                            ((x >> 18) & 0x1))
+#define SCU_HW_STRAP_CLK_SOURCE_MASK       ((0x1 << 23) | (0x1 << 18))
+#define     CLK_25M_IN                         (0x1 << 23)
+#define     CLK_24M_IN                         0
+#define     CLK_48M_IN                         1
+#define     CLK_25M_IN_24M_USB_CKI             2
+#define     CLK_25M_IN_48M_USB_CKI             3
+
+#define SCU_HW_STRAP_2ND_BOOT_WDT          (0x1 << 17)
+#define SCU_HW_STRAP_SUPER_IO_CONFIG       (0x1 << 16)
+#define SCU_HW_STRAP_VGA_CLASS_CODE        (0x1 << 15)
+#define SCU_HW_STRAP_LPC_RESET_PIN         (0x1 << 14)
+#define SCU_HW_STRAP_SPI_MODE(x)           (x << 12)
+#define SCU_HW_STRAP_SPI_MODE_MASK         (0x3 << 12)
+#define     SCU_HW_STRAP_SPI_DIS               0
+#define     SCU_HW_STRAP_SPI_MASTER            1
+#define     SCU_HW_STRAP_SPI_M_S_EN            2
+#define     SCU_HW_STRAP_SPI_PASS_THROUGH      3
+
+#define SCU_HW_STRAP_SET_CPU_AHB_RATIO(x)  (x << 10)
+#define SCU_HW_STRAP_GET_CPU_AHB_RATIO(x)  ((x >> 10) & 3)
+#define SCU_HW_STRAP_CPU_AHB_RATIO_MASK    (0x3 << 10)
+#define     CPU_AHB_RATIO_1_1                  0
+#define     CPU_AHB_RATIO_2_1                  1
+#define     CPU_AHB_RATIO_4_1                  2
+#define     CPU_AHB_RATIO_3_1                  3
+
+#define SCU_HW_STRAP_GET_H_PLL_CLK(x)      ((x >> 8) & 0x3)
+#define SCU_HW_STRAP_H_PLL_CLK_MASK        (0x3 << 8)
+#define     CPU_384MHZ                         0
+#define     CPU_360MHZ                         1
+#define     CPU_336MHZ                         2
+#define     CPU_408MHZ                         3
+
+#define SCU_HW_STRAP_MAC1_RGMII            (0x1 << 7)
+#define SCU_HW_STRAP_MAC0_RGMII            (0x1 << 6)
+#define SCU_HW_STRAP_VGA_BIOS_ROM          (0x1 << 5)
+#define SCU_HW_STRAP_SPI_WIDTH             (0x1 << 4)
+
+#define SCU_HW_STRAP_VGA_SIZE_GET(x)       ((x >> 2) & 0x3)
+#define SCU_HW_STRAP_VGA_MASK              (0x3 << 2)
+#define SCU_HW_STRAP_VGA_SIZE_SET(x)       (x << 2)
+#define     VGA_8M_DRAM                        0
+#define     VGA_16M_DRAM                       1
+#define     VGA_32M_DRAM                       2
+#define     VGA_64M_DRAM                       3
+
+#define SCU_HW_STRAP_BOOT_MODE(x)          (x)
+#define     NOR_BOOT                           0
+#define     NAND_BOOT                          1
+#define     SPI_BOOT                           2
+#define     DIS_BOOT                           3
+
 #endif /* ASPEED_SCU_H */
-- 
2.1.4