aspeed: Refactor UART init for multi-SoC machines

This change moves the code that connects the SoC UART's to serial_hd's
to the machine.

It makes each UART a proper child member of the SoC, and then allows the
machine to selectively initialize the chardev for each UART with a
serial_hd.

This should preserve backwards compatibility, but also allow multi-SoC
boards to completely change the wiring of serial devices from the
command line to specific SoC UART's.

This also removes the uart-default property from the SoC, since the SoC
doesn't need to know what UART is the "default" on the machine anymore.

I tested this using the images and commands from the previous
refactoring, and another test image for the ast1030:

    wget https://github.com/facebook/openbmc/releases/download/v2021.49.0/fuji.mtd
    wget https://github.com/facebook/openbmc/releases/download/v2021.49.0/wedge100.mtd
    wget https://github.com/peterdelevoryas/OpenBIC/releases/download/oby35-cl-2022.13.01/Y35BCL.elf

Fuji uses UART1:

    qemu-system-arm -machine fuji-bmc \
        -drive file=fuji.mtd,format=raw,if=mtd \
        -nographic

ast2600-evb uses uart-default=UART5:

    qemu-system-arm -machine ast2600-evb \
        -drive file=fuji.mtd,format=raw,if=mtd \
        -serial null -serial mon:stdio -display none

Wedge100 uses UART3:

    qemu-system-arm -machine palmetto-bmc \
        -drive file=wedge100.mtd,format=raw,if=mtd \
        -serial null -serial null -serial null \
        -serial mon:stdio -display none

AST1030 EVB uses UART5:

    qemu-system-arm -machine ast1030-evb \
        -kernel Y35BCL.elf -nographic

Fixes: 6827ff20b2975 ("hw: aspeed: Init all UART's with serial devices")
Signed-off-by: Peter Delevoryas <peter@pjd.dev>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220705191400.41632-4-peter@pjd.dev>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

hw/arm/aspeed.c

@@ -26,6 +26,7 @@
 #include "qemu/error-report.h"
 #include "qemu/units.h"
 #include "hw/qdev-clock.h"
+#include "sysemu/sysemu.h"
 
 static struct arm_boot_info aspeed_board_binfo = {
     .board_id = -1, /* device-tree-only board */
@@ -301,6 +302,21 @@ static void sdhci_attach_drive(SDHCIState *sdhci, DriveInfo *dinfo)
                                &error_fatal);
 }
 
+static void connect_serial_hds_to_uarts(AspeedMachineState *bmc)
+{
+    AspeedMachineClass *amc = ASPEED_MACHINE_GET_CLASS(bmc);
+    AspeedSoCState *s = &bmc->soc;
+    AspeedSoCClass *sc = ASPEED_SOC_GET_CLASS(s);
+
+    aspeed_soc_uart_set_chr(s, amc->uart_default, serial_hd(0));
+    for (int i = 1, uart = ASPEED_DEV_UART1; i < sc->uarts_num; i++, uart++) {
+        if (uart == amc->uart_default) {
+            continue;
+        }
+        aspeed_soc_uart_set_chr(s, uart, serial_hd(i));
+    }
+}
+
 static void aspeed_machine_init(MachineState *machine)
 {
     AspeedMachineState *bmc = ASPEED_MACHINE(machine);
@@ -346,8 +362,7 @@ static void aspeed_machine_init(MachineState *machine)
         object_property_set_int(OBJECT(&bmc->soc), "hw-prot-key",
                                 ASPEED_SCU_PROT_KEY, &error_abort);
     }
-    qdev_prop_set_uint32(DEVICE(&bmc->soc), "uart-default",
-                         amc->uart_default);
+    connect_serial_hds_to_uarts(bmc);
     qdev_realize(DEVICE(&bmc->soc), NULL, &error_abort);
 
     aspeed_board_init_flashes(&bmc->soc.fmc,
@@ -1383,8 +1398,7 @@ static void aspeed_minibmc_machine_init(MachineState *machine)
 
     object_property_set_link(OBJECT(&bmc->soc), "memory",
                              OBJECT(get_system_memory()), &error_abort);
-    qdev_prop_set_uint32(DEVICE(&bmc->soc), "uart-default",
-                         amc->uart_default);
+    connect_serial_hds_to_uarts(bmc);
     qdev_realize(DEVICE(&bmc->soc), NULL, &error_abort);
 
     aspeed_board_init_flashes(&bmc->soc.fmc,

hw/arm/aspeed_ast10x0.c

@@ -144,6 +144,10 @@ static void aspeed_soc_ast1030_init(Object *obj)
         object_initialize_child(obj, "wdt[*]", &s->wdt[i], typename);
     }
 
+    for (i = 0; i < sc->uarts_num; i++) {
+        object_initialize_child(obj, "uart[*]", &s->uart[i], TYPE_SERIAL_MM);
+    }
+
     snprintf(typename, sizeof(typename), "aspeed.gpio-%s", socname);
     object_initialize_child(obj, "gpio", &s->gpio, typename);
 
@@ -255,7 +259,9 @@ static void aspeed_soc_ast1030_realize(DeviceState *dev_soc, Error **errp)
                                 sc->irqmap[ASPEED_DEV_KCS] + aspeed_lpc_kcs_4));
 
     /* UART */
-    aspeed_soc_uart_init(s);
+    if (!aspeed_soc_uart_realize(s, errp)) {
+        return;
+    }
 
     /* Timer */
     object_property_set_link(OBJECT(&s->timerctrl), "scu", OBJECT(&s->scu),

hw/arm/aspeed_ast2600.c

@@ -214,6 +214,10 @@ static void aspeed_soc_ast2600_init(Object *obj)
         object_initialize_child(obj, "mii[*]", &s->mii[i], TYPE_ASPEED_MII);
     }
 
+    for (i = 0; i < sc->uarts_num; i++) {
+        object_initialize_child(obj, "uart[*]", &s->uart[i], TYPE_SERIAL_MM);
+    }
+
     snprintf(typename, sizeof(typename), TYPE_ASPEED_XDMA "-%s", socname);
     object_initialize_child(obj, "xdma", &s->xdma, typename);
 
@@ -386,7 +390,9 @@ static void aspeed_soc_ast2600_realize(DeviceState *dev, Error **errp)
                        aspeed_soc_get_irq(s, ASPEED_DEV_ADC));
 
     /* UART */
-    aspeed_soc_uart_init(s);
+    if (!aspeed_soc_uart_realize(s, errp)) {
+        return;
+    }
 
     /* I2C */
     object_property_set_link(OBJECT(&s->i2c), "dram", OBJECT(s->dram_mr),

hw/arm/aspeed_soc.c

@@ -208,6 +208,10 @@ static void aspeed_soc_init(Object *obj)
                                 TYPE_FTGMAC100);
     }
 
+    for (i = 0; i < sc->uarts_num; i++) {
+        object_initialize_child(obj, "uart[*]", &s->uart[i], TYPE_SERIAL_MM);
+    }
+
     snprintf(typename, sizeof(typename), TYPE_ASPEED_XDMA "-%s", socname);
     object_initialize_child(obj, "xdma", &s->xdma, typename);
 
@@ -315,7 +319,9 @@ static void aspeed_soc_realize(DeviceState *dev, Error **errp)
                        aspeed_soc_get_irq(s, ASPEED_DEV_ADC));
 
     /* UART */
-    aspeed_soc_uart_init(s);
+    if (!aspeed_soc_uart_realize(s, errp)) {
+        return;
+    }
 
     /* I2C */
     object_property_set_link(OBJECT(&s->i2c), "dram", OBJECT(s->dram_mr),
@@ -482,8 +488,6 @@ static Property aspeed_soc_properties[] = {
                      MemoryRegion *),
     DEFINE_PROP_LINK("dram", AspeedSoCState, dram_mr, TYPE_MEMORY_REGION,
                      MemoryRegion *),
-    DEFINE_PROP_UINT32("uart-default", AspeedSoCState, uart_default,
-                       ASPEED_DEV_UART5),
     DEFINE_PROP_END_OF_LIST(),
 };
 
@@ -573,23 +577,37 @@ qemu_irq aspeed_soc_get_irq(AspeedSoCState *s, int dev)
     return ASPEED_SOC_GET_CLASS(s)->get_irq(s, dev);
 }
 
-void aspeed_soc_uart_init(AspeedSoCState *s)
+bool aspeed_soc_uart_realize(AspeedSoCState *s, Error **errp)
 {
     AspeedSoCClass *sc = ASPEED_SOC_GET_CLASS(s);
-    int i, uart;
-
-    /* Attach an 8250 to the IO space as our UART */
-    serial_mm_init(s->memory, sc->memmap[s->uart_default], 2,
-                   aspeed_soc_get_irq(s, s->uart_default), 38400,
-                   serial_hd(0), DEVICE_LITTLE_ENDIAN);
-    for (i = 1, uart = ASPEED_DEV_UART1; i < sc->uarts_num; i++, uart++) {
-        if (uart == s->uart_default) {
-            uart++;
+    SerialMM *smm;
+
+    for (int i = 0, uart = ASPEED_DEV_UART1; i < sc->uarts_num; i++, uart++) {
+        smm = &s->uart[i];
+
+        /* Chardev property is set by the machine. */
+        qdev_prop_set_uint8(DEVICE(smm), "regshift", 2);
+        qdev_prop_set_uint32(DEVICE(smm), "baudbase", 38400);
+        qdev_set_legacy_instance_id(DEVICE(smm), sc->memmap[uart], 2);
+        qdev_prop_set_uint8(DEVICE(smm), "endianness", DEVICE_LITTLE_ENDIAN);
+        if (!sysbus_realize(SYS_BUS_DEVICE(smm), errp)) {
+            return false;
         }
-        serial_mm_init(s->memory, sc->memmap[uart], 2,
-                       aspeed_soc_get_irq(s, uart), 38400,
-                       serial_hd(i), DEVICE_LITTLE_ENDIAN);
+
+        sysbus_connect_irq(SYS_BUS_DEVICE(smm), 0, aspeed_soc_get_irq(s, uart));
+        aspeed_mmio_map(s, SYS_BUS_DEVICE(smm), 0, sc->memmap[uart]);
     }
+
+    return true;
+}
+
+void aspeed_soc_uart_set_chr(AspeedSoCState *s, int dev, Chardev *chr)
+{
+    AspeedSoCClass *sc = ASPEED_SOC_GET_CLASS(s);
+    int i = dev - ASPEED_DEV_UART1;
+
+    g_assert(0 <= i && i < ARRAY_SIZE(s->uart) && i < sc->uarts_num);
+    qdev_prop_set_chr(DEVICE(&s->uart[i]), "chardev", chr);
 }
 
 /*

include/hw/arm/aspeed_soc.h

@@ -36,12 +36,14 @@
 #include "hw/misc/aspeed_lpc.h"
 #include "hw/misc/unimp.h"
 #include "hw/misc/aspeed_peci.h"
+#include "hw/char/serial.h"
 
 #define ASPEED_SPIS_NUM  2
 #define ASPEED_EHCIS_NUM 2
 #define ASPEED_WDTS_NUM  4
 #define ASPEED_CPUS_NUM  2
 #define ASPEED_MACS_NUM  4
+#define ASPEED_UARTS_NUM 13
 
 struct AspeedSoCState {
     /*< private >*/
@@ -79,7 +81,7 @@ struct AspeedSoCState {
     AspeedSDHCIState emmc;
     AspeedLPCState lpc;
     AspeedPECIState peci;
-    uint32_t uart_default;
+    SerialMM uart[ASPEED_UARTS_NUM];
     Clock *sysclk;
     UnimplementedDeviceState iomem;
     UnimplementedDeviceState video;
@@ -175,7 +177,8 @@ enum {
 };
 
 qemu_irq aspeed_soc_get_irq(AspeedSoCState *s, int dev);
-void aspeed_soc_uart_init(AspeedSoCState *s);
+bool aspeed_soc_uart_realize(AspeedSoCState *s, Error **errp);
+void aspeed_soc_uart_set_chr(AspeedSoCState *s, int dev, Chardev *chr);
 bool aspeed_soc_dram_init(AspeedSoCState *s, Error **errp);
 void aspeed_mmio_map(AspeedSoCState *s, SysBusDevice *dev, int n, hwaddr addr);
 void aspeed_mmio_map_unimplemented(AspeedSoCState *s, SysBusDevice *dev,