Commit a8b43ac5b6 for qemu.org
commit a8b43ac5b6a35b0bdf295f943cbd3f6b6669c197
Author: Kane Chen <kane_chen@aspeedtech.com>
Date: Wed Feb 4 08:21:35 2026 +0000
hw/arm/aspeed: attach I2C device to AST1700 model
Connect the I2C controller to the AST1700 model by mapping its MMIO
region and wiring its interrupt line.
Signed-off-by: Kane-Chen-AS <kane_chen@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20260204082113.3955407-15-kane_chen@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
diff --git a/hw/arm/aspeed_ast1700.c b/hw/arm/aspeed_ast1700.c
index 7efce450f6..e264b2200b 100644
--- a/hw/arm/aspeed_ast1700.c
+++ b/hw/arm/aspeed_ast1700.c
@@ -22,6 +22,7 @@ enum {
ASPEED_AST1700_DEV_ADC,
ASPEED_AST1700_DEV_SCU,
ASPEED_AST1700_DEV_GPIO,
+ ASPEED_AST1700_DEV_I2C,
ASPEED_AST1700_DEV_UART12,
ASPEED_AST1700_DEV_LTPI_CTRL,
ASPEED_AST1700_DEV_SPI0_MEM,
@@ -33,6 +34,7 @@ static const hwaddr aspeed_ast1700_io_memmap[] = {
[ASPEED_AST1700_DEV_ADC] = 0x00C00000,
[ASPEED_AST1700_DEV_SCU] = 0x00C02000,
[ASPEED_AST1700_DEV_GPIO] = 0x00C0B000,
+ [ASPEED_AST1700_DEV_I2C] = 0x00C0F000,
[ASPEED_AST1700_DEV_UART12] = 0x00C33B00,
[ASPEED_AST1700_DEV_LTPI_CTRL] = 0x00C34000,
[ASPEED_AST1700_DEV_SPI0_MEM] = 0x04000000,
@@ -113,6 +115,19 @@ static void aspeed_ast1700_realize(DeviceState *dev, Error **errp)
aspeed_ast1700_io_memmap[ASPEED_AST1700_DEV_GPIO],
sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->gpio), 0));
+ /* I2C */
+ snprintf(dev_name, sizeof(dev_name), "ioexp%d", s->board_idx);
+ qdev_prop_set_string(DEVICE(&s->i2c), "bus-label", dev_name);
+
+ object_property_set_link(OBJECT(&s->i2c), "dram",
+ OBJECT(s->dram_mr), errp);
+ if (!sysbus_realize(SYS_BUS_DEVICE(&s->i2c), errp)) {
+ return;
+ }
+ memory_region_add_subregion(&s->iomem,
+ aspeed_ast1700_io_memmap[ASPEED_AST1700_DEV_I2C],
+ sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->i2c), 0));
+
/* LTPI controller */
if (!sysbus_realize(SYS_BUS_DEVICE(&s->ltpi), errp)) {
return;
@@ -146,6 +161,10 @@ static void aspeed_ast1700_instance_init(Object *obj)
object_initialize_child(obj, "ioexp-gpio", &s->gpio,
"aspeed.gpio-ast2700");
+ /* I2C */
+ object_initialize_child(obj, "ioexp-i2c", &s->i2c,
+ "aspeed.i2c-ast2700");
+
/* LTPI controller */
object_initialize_child(obj, "ltpi-ctrl",
&s->ltpi, TYPE_ASPEED_LTPI);
diff --git a/hw/arm/aspeed_ast27x0.c b/hw/arm/aspeed_ast27x0.c
index cd4028fcd4..8242258df4 100644
--- a/hw/arm/aspeed_ast27x0.c
+++ b/hw/arm/aspeed_ast27x0.c
@@ -157,6 +157,8 @@ static const int aspeed_soc_ast2700a1_irqmap[] = {
[ASPEED_DEV_EHCI4] = 196,
[ASPEED_DEV_PECI] = 197,
[ASPEED_DEV_SDHCI] = 197,
+ [ASPEED_DEV_IOEXP0_I2C] = 198,
+ [ASPEED_DEV_IOEXP1_I2C] = 200,
};
/* GICINT 192 */
@@ -213,6 +215,18 @@ static const int ast2700_gic197_intcmap[] = {
[ASPEED_DEV_PECI] = 4,
};
+/* Primary AST1700 Interrupts */
+/* A1: GICINT 198 */
+static const int ast2700_gic198_intcmap[] = {
+ [ASPEED_DEV_IOEXP0_I2C] = 0, /* 0 - 15 */
+};
+
+/* Secondary AST1700 Interrupts */
+/* A1: GINTC 200 */
+static const int ast2700_gic200_intcmap[] = {
+ [ASPEED_DEV_IOEXP1_I2C] = 0, /* 0 - 15 */
+};
+
/* GICINT 192 ~ 201 */
struct gic_intc_irq_info {
int irq;
@@ -228,9 +242,9 @@ static const struct gic_intc_irq_info ast2700_gic_intcmap[] = {
{195, 1, 3, ast2700_gic195_intcmap},
{196, 1, 4, ast2700_gic196_intcmap},
{197, 1, 5, ast2700_gic197_intcmap},
- {198, 1, 6, NULL},
+ {198, 2, 0, ast2700_gic198_intcmap},
{199, 1, 7, NULL},
- {200, 1, 8, NULL},
+ {200, 3, 0, ast2700_gic200_intcmap},
{201, 1, 9, NULL},
};
@@ -263,14 +277,23 @@ static qemu_irq aspeed_soc_ast2700_get_irq_index(AspeedSoCState *s, int dev,
int or_idx;
int idx;
int i;
+ OrIRQState *porgates;
for (i = 0; i < ARRAY_SIZE(ast2700_gic_intcmap); i++) {
if (sc->irqmap[dev] == ast2700_gic_intcmap[i].irq) {
assert(ast2700_gic_intcmap[i].ptr);
or_idx = ast2700_gic_intcmap[i].orgate_idx;
idx = ast2700_gic_intcmap[i].intc_idx;
- return qdev_get_gpio_in(DEVICE(&a->intc[idx].orgates[or_idx]),
+ if (idx < ASPEED_INTC_NUM) {
+ porgates = &a->intc[idx].orgates[or_idx];
+ return qdev_get_gpio_in(DEVICE(porgates),
+ ast2700_gic_intcmap[i].ptr[dev] + index);
+ } else {
+ idx -= ASPEED_INTC_NUM;
+ porgates = &a->intcioexp[idx].orgates[or_idx];
+ return qdev_get_gpio_in(DEVICE(porgates),
ast2700_gic_intcmap[i].ptr[dev] + index);
+ }
}
}
@@ -1025,6 +1048,8 @@ static void aspeed_soc_ast2700_realize(DeviceState *dev, Error **errp)
/* IO Expander */
for (i = 0; i < sc->ioexp_num; i++) {
+ AspeedI2CClass *i2c_ctl;
+
qdev_prop_set_uint8(DEVICE(&s->ioexp[i]), "board-idx", i);
object_property_set_link(OBJECT(&s->ioexp[i]), "dram",
OBJECT(s->dram_mr), &error_abort);
@@ -1057,6 +1082,26 @@ static void aspeed_soc_ast2700_realize(DeviceState *dev, Error **errp)
sysbus_connect_irq(SYS_BUS_DEVICE(&s->ioexp[i].gpio), 0,
aspeed_soc_ast2700_get_irq(s, ASPEED_DEV_GPIO));
+ /* I2C */
+ i2c_ctl = ASPEED_I2C_GET_CLASS(&s->ioexp[i].i2c);
+ for (int j = 0; j < i2c_ctl->num_busses; j++) {
+ /*
+ * For I2C on AST1700:
+ * I2C bus interrupts are connected to the OR gate from bit 0 to bit
+ * 15, and the OR gate output pin is connected to the input pin of
+ * GICINT192 of IO expander Interrupt controller (INTC2/3). Then,
+ * the output pin is connected to the INTC (CPU Die) input pin, and
+ * its output pin is connected to the GIC.
+ *
+ * I2C bus 0 is connected to the OR gate at bit 0.
+ * I2C bus 15 is connected to the OR gate at bit 15.
+ */
+ irq = aspeed_soc_ast2700_get_irq_index(s,
+ ASPEED_DEV_IOEXP0_I2C + i,
+ j);
+ sysbus_connect_irq(SYS_BUS_DEVICE(&s->ioexp[i].i2c.busses[j]),
+ 0, irq);
+ }
}
aspeed_mmio_map_unimplemented(s->memory, SYS_BUS_DEVICE(&s->dpmcu),
diff --git a/include/hw/arm/aspeed_ast1700.h b/include/hw/arm/aspeed_ast1700.h
index 63cfcb4c24..1005ce6364 100644
--- a/include/hw/arm/aspeed_ast1700.h
+++ b/include/hw/arm/aspeed_ast1700.h
@@ -12,6 +12,7 @@
#include "hw/misc/aspeed_scu.h"
#include "hw/adc/aspeed_adc.h"
#include "hw/gpio/aspeed_gpio.h"
+#include "hw/i2c/aspeed_i2c.h"
#include "hw/misc/aspeed_ltpi.h"
#include "hw/ssi/aspeed_smc.h"
#include "hw/char/serial-mm.h"
@@ -35,6 +36,7 @@ struct AspeedAST1700SoCState {
AspeedADCState adc;
AspeedSCUState scu;
AspeedGPIOState gpio;
+ AspeedI2CState i2c;
};
#endif /* ASPEED_AST1700_H */
diff --git a/include/hw/arm/aspeed_soc.h b/include/hw/arm/aspeed_soc.h
index b051d0eb3a..4ea2521041 100644
--- a/include/hw/arm/aspeed_soc.h
+++ b/include/hw/arm/aspeed_soc.h
@@ -290,6 +290,8 @@ enum {
ASPEED_DEV_LTPI_CTRL2,
ASPEED_DEV_LTPI_IO0,
ASPEED_DEV_LTPI_IO1,
+ ASPEED_DEV_IOEXP0_I2C,
+ ASPEED_DEV_IOEXP1_I2C,
ASPEED_DEV_IOEXP0_INTCIO,
ASPEED_DEV_IOEXP1_INTCIO,
};