hw/arm: Connect SPI Controller to BCM2835

This patch will allow the SPI controller to be accessible from BCM2835 based
boards as SPI0. SPI driver is usually disabled by default and config.txt does
not work.

Instead, dtmerge can be used to apply spi=on on a bcm2835 dtb file.

Signed-off-by: Rayhan Faizel <rayhan.faizel@gmail.com>
Message-id: 20240129221807.2983148-3-rayhan.faizel@gmail.com
[PMM: indent tweak]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/Kconfig

@@ -429,6 +429,7 @@ config RASPI
     select PL011 # UART
     select SDHCI
     select USB_DWC2
+    select BCM2835_SPI
 
 config STM32F100_SOC
     bool

hw/arm/bcm2835_peripherals.c

@@ -144,6 +144,10 @@ static void bcm2835_peripherals_init(Object *obj)
     /* Power Management */
     object_initialize_child(obj, "powermgt", &s->powermgt,
                             TYPE_BCM2835_POWERMGT);
+
+    /* SPI */
+    object_initialize_child(obj, "bcm2835-spi0", &s->spi[0],
+                            TYPE_BCM2835_SPI);
 }
 
 static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp)
@@ -402,11 +406,22 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp)
     memory_region_add_subregion(&s->peri_mr, PM_OFFSET,
                 sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->powermgt), 0));
 
+    /* SPI */
+    if (!sysbus_realize(SYS_BUS_DEVICE(&s->spi[0]), errp)) {
+        return;
+    }
+
+    memory_region_add_subregion(&s->peri_mr, SPI0_OFFSET,
+                sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->spi[0]), 0));
+    sysbus_connect_irq(SYS_BUS_DEVICE(&s->spi[0]), 0,
+                       qdev_get_gpio_in_named(DEVICE(&s->ic),
+                                              BCM2835_IC_GPU_IRQ,
+                                              INTERRUPT_SPI));
+
     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->spi[0], "bcm2835-spi0", SPI0_OFFSET, 0x20);
     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);

include/hw/arm/bcm2835_peripherals.h

@@ -31,6 +31,7 @@
 #include "hw/gpio/bcm2835_gpio.h"
 #include "hw/timer/bcm2835_systmr.h"
 #include "hw/usb/hcd-dwc2.h"
+#include "hw/ssi/bcm2835_spi.h"
 #include "hw/misc/unimp.h"
 #include "qom/object.h"
 
@@ -66,7 +67,7 @@ struct BCM2835PeripheralState {
     BCM2835GpioState gpio;
     Bcm2835ThermalState thermal;
     UnimplementedDeviceState i2s;
-    UnimplementedDeviceState spi[1];
+    BCM2835SPIState spi[1];
     UnimplementedDeviceState i2c[3];
     UnimplementedDeviceState otp;
     UnimplementedDeviceState dbus;