[Qemu-devel] [PATCH v3 07/10] hw/misc: use macros to define hw-strap1 register on the AST2400 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>
---

 Changes since v2:

 - more precise definitions of the hw-strap1 register
 - moved hw-strap1 to the board level.

 hw/arm/aspeed.c              |  15 +++++-
 include/hw/misc/aspeed_scu.h | 118 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 132 insertions(+), 1 deletion(-)

diff --git a/hw/arm/aspeed.c b/hw/arm/aspeed.c
index 4226b8dcd95c..80907b4244ea 100644
--- a/hw/arm/aspeed.c
+++ b/hw/arm/aspeed.c
@@ -39,8 +39,21 @@ enum {
     PALMETTO_BMC
 };
 
+#define PALMETTO_BMC_HW_STRAP1 (                                        \
+        SCU_AST2400_HW_STRAP_DRAM_SIZE(DRAM_SIZE_256MB) |               \
+        SCU_AST2400_HW_STRAP_DRAM_CONFIG(2 /* DDR3 with CL=6, CWL=5 */) | \
+        SCU_AST2400_HW_STRAP_ACPI_DIS |                                 \
+        SCU_AST2400_HW_STRAP_SET_CLK_SOURCE(AST2400_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_AST2400_HW_STRAP_SET_CPU_AHB_RATIO(AST2400_CPU_AHB_RATIO_2_1) | \
+        SCU_HW_STRAP_SPI_WIDTH |                                        \
+        SCU_HW_STRAP_VGA_SIZE_SET(VGA_16M_DRAM) |                       \
+        SCU_AST2400_HW_STRAP_BOOT_MODE(AST2400_SPI_BOOT))
+
 static const AspeedBoardConfig aspeed_boards[] = {
-    [PALMETTO_BMC] = { "ast2400-a0", 0x120CE416 },
+    [PALMETTO_BMC] = { "ast2400-a0", PALMETTO_BMC_HW_STRAP1 },
 };
 
 static void aspeed_board_init_flashes(AspeedSMCState *s, const char *flashtype,
diff --git a/include/hw/misc/aspeed_scu.h b/include/hw/misc/aspeed_scu.h
index fdfd982288f2..0761f0880c69 100644
--- a/include/hw/misc/aspeed_scu.h
+++ b/include/hw/misc/aspeed_scu.h
@@ -36,4 +36,122 @@ typedef struct AspeedSCUState {
 
 extern bool is_supported_silicon_rev(uint32_t silicon_rev);
 
+/*
+ * Extracted from Aspeed SDK v00.03.21. Fixes and extra definitions
+ * were added.
+ *
+ * Original header file :
+ *    arch/arm/mach-aspeed/include/mach/regs-scu.h
+ *
+ *    Copyright (C) 2012-2020  ASPEED Technology Inc.
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License version 2 as
+ *    published by the Free Software Foundation.
+ *
+ *      History      :
+ *       1. 2012/12/29 Ryan Chen Create
+ */
+
+/* Hardware Strapping Register definition (for Aspeed AST2400 SOC)
+ *
+ * 31:29  Software defined strapping registers
+ * 28:27  DRAM size setting (for VGA driver use)
+ * 26:24  DRAM configuration setting
+ * 23     Enable 25 MHz reference clock input
+ * 22     Enable GPIOE pass-through mode
+ * 21     Enable GPIOD pass-through mode
+ * 20     Disable LPC to decode SuperIO 0x2E/0x4E address
+ * 19     Disable ACPI function
+ * 23,18  Clock source selection
+ * 17     Enable BMC 2nd boot watchdog timer
+ * 16     SuperIO configuration address selection
+ * 15     VGA Class Code selection
+ * 14     Enable LPC dedicated reset pin function
+ * 13:12  SPI mode selection
+ * 11:10  CPU/AHB clock frequency ratio selection
+ * 9:8    H-PLL default clock frequency selection
+ * 7      Define MAC#2 interface
+ * 6      Define MAC#1 interface
+ * 5      Enable VGA BIOS ROM
+ * 4      Boot flash memory extended option
+ * 3:2    VGA memory size selection
+ * 1:0    BMC CPU boot code selection
+ */
+#define SCU_AST2400_HW_STRAP_SW_DEFINE(x)          (x << 29)
+#define SCU_AST2400_HW_STRAP_SW_DEFINE_MASK        (0x7 << 29)
+
+#define SCU_AST2400_HW_STRAP_DRAM_SIZE(x)          (x << 27)
+#define SCU_AST2400_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_AST2400_HW_STRAP_DRAM_CONFIG(x)        (x << 24)
+#define SCU_AST2400_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_AST2400_HW_STRAP_ACPI_DIS              (0x1 << 19)
+
+/* bit 23, 18 [1,0] */
+#define SCU_AST2400_HW_STRAP_SET_CLK_SOURCE(x)     ((((x & 0x3) >> 1) << 23) | \
+                                                    ((x & 0x1) << 18))
+#define SCU_AST2400_HW_STRAP_GET_CLK_SOURCE(x)     ((((x >> 23) & 0x1) << 1) | \
+                                                    ((x >> 18) & 0x1))
+#define SCU_AST2400_HW_STRAP_CLK_SOURCE_MASK       ((0x1 << 23) | (0x1 << 18))
+#define     AST2400_CLK_25M_IN                         (0x1 << 23)
+#define     AST2400_CLK_24M_IN                         0
+#define     AST2400_CLK_48M_IN                         1
+#define     AST2400_CLK_25M_IN_24M_USB_CKI             2
+#define     AST2400_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_AST2400_HW_STRAP_SET_CPU_AHB_RATIO(x)  (x << 10)
+#define SCU_AST2400_HW_STRAP_GET_CPU_AHB_RATIO(x)  ((x >> 10) & 3)
+#define SCU_AST2400_HW_STRAP_CPU_AHB_RATIO_MASK    (0x3 << 10)
+#define     AST2400_CPU_AHB_RATIO_1_1                  0
+#define     AST2400_CPU_AHB_RATIO_2_1                  1
+#define     AST2400_CPU_AHB_RATIO_4_1                  2
+#define     AST2400_CPU_AHB_RATIO_3_1                  3
+
+#define SCU_AST2400_HW_STRAP_GET_H_PLL_CLK(x)      ((x >> 8) & 0x3)
+#define SCU_AST2400_HW_STRAP_H_PLL_CLK_MASK        (0x3 << 8)
+#define     AST2400_CPU_384MHZ                         0
+#define     AST2400_CPU_360MHZ                         1
+#define     AST2400_CPU_336MHZ                         2
+#define     AST2400_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_AST2400_HW_STRAP_BOOT_MODE(x)          (x)
+#define     AST2400_NOR_BOOT                           0
+#define     AST2400_NAND_BOOT                          1
+#define     AST2400_SPI_BOOT                           2
+#define     AST2400_DIS_BOOT                           3
+
 #endif /* ASPEED_SCU_H */
-- 
2.7.4