hw/arm: sanmiguel: add Facebook SanMiguel BMC machine

Add an AST2600-based machine for the Facebook SanMiguel BMC, derived
from the aspeed-bmc-facebook-sanmiguel.dts device tree.

The board wires up three TMP75 temperature sensors across its I2C buses,
alongside IO expanders, FRU EEPROMs, an I2C mux and an RTC, with 2 GiB
RAM, dual FMC flash and RGMII networking.

Signed-off-by: Emmanuel Blot <emmanuel.blot@free.fr>
Link: https://lore.kernel.org/qemu-devel/20260731-sanmiguel-bmc-locator-v2-12-1266926ba769@free.fr
[ clg: - adjusted on upstream ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>

2 files changed, 141 insertions, 0 deletions

diff --git a/hw/arm/aspeed_ast2600_sanmiguel.c b/hw/arm/aspeed_ast2600_sanmiguel.c
new file mode 100644
index 0000000000..ca07a0deaa
--- /dev/null
+++ b/hw/arm/aspeed_ast2600_sanmiguel.c
@@ -0,0 +1,140 @@
+/*
+ * Facebook SanMiguel BMC
+ *
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "hw/arm/aspeed.h"
+#include "hw/arm/aspeed_soc.h"
+#include "hw/i2c/i2c_mux_pca954x.h"
+#include "hw/gpio/pca9552.h"
+#include "hw/gpio/pca9554.h"
+#include "hw/nvram/eeprom_at24c.h"
+#include "hw/sensor/tmp105.h"
+
+/* SanMiguel hardware values */
+#define SANMIGUEL_BMC_HW_STRAP1 0x00002002
+#define SANMIGUEL_BMC_HW_STRAP2 0x00000000
+#define SANMIGUEL_BMC_RAM_SIZE ASPEED_RAM_SIZE(2 * GiB)
+
+#define TYPE_DS1338 "ds1338"
+
+static void sanmiguel_bmc_i2c_init(AspeedMachineState *bmc)
+{
+    /* Reference: aspeed-bmc-facebook-sanmiguel.dts */
+
+    AspeedSoCState *soc = bmc->soc;
+    I2CBus *i2c[16] = {};
+
+    for (unsigned idx = 0; idx < ARRAY_SIZE(i2c); idx++) {
+        i2c[idx] = aspeed_i2c_get_bus(&soc->i2c, idx);
+    }
+
+    /* &i2c0 */
+    /* ssif-bmc@10 — no QEMU model */
+
+    /* &i2c1 — empty */
+
+    /* &i2c2 — HPM0 */
+    /* hpm0_ioexp_20: pca9555@20 */
+    i2c_slave_create_simple(i2c[2], TYPE_PCA9555, 0x20);
+    /* hpm0_ioexp_21: pca9555@21 */
+    i2c_slave_create_simple(i2c[2], TYPE_PCA9555, 0x21);
+
+    /* &i2c3 — empty */
+    /* &i2c4 — empty */
+
+    /* &i2c5 — SMM */
+    /* smm_ioexp_20: pca9555@20 */
+    i2c_slave_create_simple(i2c[5], TYPE_PCA9555, 0x20);
+    /* smm_ioexp_21: pca9555@21 */
+    i2c_slave_create_simple(i2c[5], TYPE_PCA9555, 0x21);
+    /* smm_temp: lm75@48 */
+    i2c_slave_create_simple(i2c[5], TYPE_TMP75, 0x48);
+    /* smm_fru: eeprom@50 (24c128 = 16 KiB) */
+    at24c_eeprom_init(i2c[5], 0x50, 16 * KiB);
+    /* rtc@6f — nct3018y (ds1338 stand-in) */
+    i2c_slave_create_simple(i2c[5], TYPE_DS1338, 0x6f);
+
+    /* &i2c6 — HMC */
+    /* hmc_ioexp: tca6408@20 (pca9554 stand-in) */
+    i2c_slave_create_simple(i2c[6], TYPE_PCA9554, 0x20);
+    /* i2c-mux@70 (PCA9546) — 4 channels (imux16-19), all empty */
+    i2c_slave_create_simple(i2c[6], TYPE_PCA9546, 0x70);
+
+    /* &i2c7 — HPM1 */
+    /* hpm1_ioexp_20: pca9555@20 */
+    i2c_slave_create_simple(i2c[7], TYPE_PCA9555, 0x20);
+    /* hpm1_ioexp_21: pca9555@21 */
+    i2c_slave_create_simple(i2c[7], TYPE_PCA9555, 0x21);
+
+    /* &i2c8 — empty */
+
+    /* &i2c9 — PDB */
+    /* mp5926@10-16, lm5066i@11-17 — no QEMU model (power monitors) */
+    /* pdb_ioexp_20: pca9555@20 */
+    i2c_slave_create_simple(i2c[9], TYPE_PCA9555, 0x20);
+    /* pdb_temp: lm75@4e */
+    i2c_slave_create_simple(i2c[9], TYPE_TMP75, 0x4e);
+    /* pdb_fru: eeprom@50 (24c128 = 16 KiB) */
+    at24c_eeprom_init(i2c[9], 0x50, 16 * KiB);
+
+    /* &i2c10 — SCM */
+    /* scm_temp: lm75@48 */
+    i2c_slave_create_simple(i2c[10], TYPE_TMP75, 0x48);
+    /* scm_fru: eeprom@50 (24c128 = 16 KiB) */
+    at24c_eeprom_init(i2c[10], 0x50, 16 * KiB);
+
+    /* &i2c11 — Switch Config */
+    /* sw_config: eeprom@50 (24c64 = 8 KiB) */
+    at24c_eeprom_init(i2c[11], 0x50, 8 * KiB);
+
+    /* &i2c12 — empty */
+
+    /* &i2c13 — SMM extension */
+    /* mctp@10 — no QEMU model */
+    /* smm_ext_ioexp: pca9554@38 */
+    i2c_slave_create_simple(i2c[13], TYPE_PCA9554, 0x38);
+    /* smm_ext_fru: eeprom@55 (24c128 = 16 KiB) */
+    at24c_eeprom_init(i2c[13], 0x55, 16 * KiB);
+
+    /* &i2c14 — FIO */
+    /* fio_ioexp: pca9555@20 */
+    i2c_slave_create_simple(i2c[14], TYPE_PCA9555, 0x20);
+    /* fio_fru: eeprom@50 (24c64 = 8 KiB) */
+    at24c_eeprom_init(i2c[14], 0x50, 8 * KiB);
+
+    /* &i2c15 — empty */
+}
+
+static void aspeed_machine_sanmiguel_class_init(ObjectClass *oc,
+                                                const void *data)
+{
+    MachineClass *mc = MACHINE_CLASS(oc);
+    AspeedMachineClass *amc = ASPEED_MACHINE_CLASS(oc);
+
+    mc->desc       = "Facebook SanMiguel BMC (Cortex-A7)";
+    amc->soc_name  = "ast2600-a3";
+    amc->hw_strap1 = SANMIGUEL_BMC_HW_STRAP1;
+    amc->hw_strap2 = SANMIGUEL_BMC_HW_STRAP2;
+    amc->fmc_model = "mx66l1g45g";
+    amc->spi_model = "mx66l1g45g";
+    amc->num_cs    = 2;
+    amc->macs_mask = ASPEED_MAC0_ON;
+    amc->i2c_init  = sanmiguel_bmc_i2c_init;
+    mc->default_ram_size = SANMIGUEL_BMC_RAM_SIZE;
+    aspeed_machine_class_init_cpus_defaults(mc);
+}
+
+static const TypeInfo aspeed_ast2600_sanmiguel_types[] = {
+    {
+        .name          = MACHINE_TYPE_NAME("sanmiguel-bmc"),
+        .parent        = TYPE_ASPEED_MACHINE,
+        .class_init    = aspeed_machine_sanmiguel_class_init,
+    }
+};
+
+DEFINE_TYPES(aspeed_ast2600_sanmiguel_types)
diff --git a/hw/arm/meson.build b/hw/arm/meson.build
index 78acb04c8b..bcc068de04 100644
--- a/hw/arm/meson.build
+++ b/hw/arm/meson.build
@@ -64,6 +64,7 @@ arm_common_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files(
   'aspeed_ast2600_fuji.c',
   'aspeed_ast2600_gb200nvl.c',
   'aspeed_ast2600_rainier.c',
+  'aspeed_ast2600_sanmiguel.c',
   'aspeed_ast10x0.c',
   'aspeed_ast10x0_evb.c',
   'aspeed_ast1040.c',