[PATCH v5 2/3] hw/arm: Connect BSC to BCM2835 board as I2C0, I2C1 and I2C2

[Rayhan Faizel]

BCM2835 has three I2C controllers. All of them share the same interrupt line.

Signed-off-by: Rayhan Faizel <rayhan.faizel@gmail.com>
---
 hw/arm/Kconfig                       |  1 +
 hw/arm/bcm2835_peripherals.c         | 45 ++++++++++++++++++++++++++--
 include/hw/arm/bcm2835_peripherals.h |  4 ++-
 3 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index 980b14d58d..2b52cec980 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -430,6 +430,7 @@ config RASPI
     select SDHCI
     select USB_DWC2
     select BCM2835_SPI
+    select BCM2835_I2C
 
 config STM32F100_SOC
     bool
diff --git a/hw/arm/bcm2835_peripherals.c b/hw/arm/bcm2835_peripherals.c
index d5573fd954..f6069b23f6 100644
--- a/hw/arm/bcm2835_peripherals.c
+++ b/hw/arm/bcm2835_peripherals.c
@@ -30,6 +30,9 @@
 #define SEPARATE_DMA_IRQ_MAX 10
 #define ORGATED_DMA_IRQ_COUNT 4
 
+/* All three I2C controllers share the same IRQ */
+#define ORGATED_I2C_IRQ_COUNT 3
+
 static void create_unimp(BCM2835PeripheralState *ps,
                          UnimplementedDeviceState *uds,
                          const char *name, hwaddr ofs, hwaddr size)
@@ -148,6 +151,19 @@ static void bcm2835_peripherals_init(Object *obj)
     /* SPI */
     object_initialize_child(obj, "bcm2835-spi0", &s->spi[0],
                             TYPE_BCM2835_SPI);
+
+    /* I2C */
+    object_initialize_child(obj, "bcm2835-i2c0", &s->i2c[0],
+                            TYPE_BCM2835_I2C);
+    object_initialize_child(obj, "bcm2835-i2c1", &s->i2c[1],
+                            TYPE_BCM2835_I2C);
+    object_initialize_child(obj, "bcm2835-i2c2", &s->i2c[2],
+                            TYPE_BCM2835_I2C);
+
+    object_initialize_child(obj, "orgated-i2c-irq",
+                            &s->orgated_i2c_irq, TYPE_OR_IRQ);
+    object_property_set_int(OBJECT(&s->orgated_i2c_irq), "num-lines",
+                            ORGATED_I2C_IRQ_COUNT, &error_abort);
 }
 
 static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp)
@@ -418,14 +434,37 @@ static void bcm2835_peripherals_realize(DeviceState *dev, 
Error **errp)
                                               BCM2835_IC_GPU_IRQ,
                                               INTERRUPT_SPI));
 
+    /* I2C */
+    for (n = 0; n < 3; n++) {
+        if (!sysbus_realize(SYS_BUS_DEVICE(&s->i2c[n]), errp)) {
+            return;
+        }
+    }
+
+    memory_region_add_subregion(&s->peri_mr, BSC0_OFFSET,
+            sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->i2c[0]), 0));
+    memory_region_add_subregion(&s->peri_mr, BSC1_OFFSET,
+            sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->i2c[1]), 0));
+    memory_region_add_subregion(&s->peri_mr, BSC2_OFFSET,
+            sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->i2c[2]), 0));
+
+    if (!qdev_realize(DEVICE(&s->orgated_i2c_irq), NULL, errp)) {
+        return;
+    }
+    for (n = 0; n < ORGATED_I2C_IRQ_COUNT; n++) {
+        sysbus_connect_irq(SYS_BUS_DEVICE(&s->i2c[n]), 0,
+                           qdev_get_gpio_in(DEVICE(&s->orgated_i2c_irq), n));
+    }
+    qdev_connect_gpio_out(DEVICE(&s->orgated_i2c_irq), 0,
+                          qdev_get_gpio_in_named(DEVICE(&s->ic),
+                                                 BCM2835_IC_GPU_IRQ,
+                                                 INTERRUPT_I2C));
+
     create_unimp(s, &s->txp, "bcm2835-txp", TXP_OFFSET, 0x1000);
     create_unimp(s, &s->armtmr, "bcm2835-sp804", ARMCTRL_TIMER0_1_OFFSET, 
0x40);
     create_unimp(s, &s->i2s, "bcm2835-i2s", I2S_OFFSET, 0x100);
     create_unimp(s, &s->smi, "bcm2835-smi", SMI_OFFSET, 0x100);
     create_unimp(s, &s->bscsl, "bcm2835-spis", BSC_SL_OFFSET, 0x100);
-    create_unimp(s, &s->i2c[0], "bcm2835-i2c0", BSC0_OFFSET, 0x20);
-    create_unimp(s, &s->i2c[1], "bcm2835-i2c1", BSC1_OFFSET, 0x20);
-    create_unimp(s, &s->i2c[2], "bcm2835-i2c2", BSC2_OFFSET, 0x20);
     create_unimp(s, &s->otp, "bcm2835-otp", OTP_OFFSET, 0x80);
     create_unimp(s, &s->dbus, "bcm2835-dbus", DBUS_OFFSET, 0x8000);
     create_unimp(s, &s->ave0, "bcm2835-ave0", AVE0_OFFSET, 0x8000);
diff --git a/include/hw/arm/bcm2835_peripherals.h 
b/include/hw/arm/bcm2835_peripherals.h
index 0203bb79d8..09a3c06533 100644
--- a/include/hw/arm/bcm2835_peripherals.h
+++ b/include/hw/arm/bcm2835_peripherals.h
@@ -32,6 +32,7 @@
 #include "hw/timer/bcm2835_systmr.h"
 #include "hw/usb/hcd-dwc2.h"
 #include "hw/ssi/bcm2835_spi.h"
+#include "hw/i2c/bcm2835_i2c.h"
 #include "hw/misc/unimp.h"
 #include "qom/object.h"
 
@@ -68,7 +69,8 @@ struct BCM2835PeripheralState {
     Bcm2835ThermalState thermal;
     UnimplementedDeviceState i2s;
     BCM2835SPIState spi[1];
-    UnimplementedDeviceState i2c[3];
+    BCM2835I2CState i2c[3];
+    OrIRQState orgated_i2c_irq;
     UnimplementedDeviceState otp;
     UnimplementedDeviceState dbus;
     UnimplementedDeviceState ave0;
-- 
2.34.1