hw/arm/stm32f405: Add RCC device to stm32f405 SoC

Add the reset and clock controller device to the stm32f405 SoC.

Signed-off-by: Roman Cardenas Rodriguez <rcardenas.rod@gmail.com>
[PMM: tweak commit message]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

docs/system/arm/stm32.rst

@@ -36,6 +36,7 @@ Supported devices
  * SPI controller
  * System configuration (SYSCFG)
  * Timer controller (TIMER)
+ * Reset and Clock Controller (RCC) (STM32F4 only, reset and enable only)
 
 Missing devices
 ---------------
@@ -53,7 +54,7 @@ Missing devices
  * Power supply configuration (PWR)
  * Random Number Generator (RNG)
  * Real-Time Clock (RTC) controller
- * Reset and Clock Controller (RCC)
+ * Reset and Clock Controller (RCC) (other features than reset and enable)
  * Secure Digital Input/Output (SDIO) interface
  * USB OTG
  * Watchdog controller (IWDG, WWDG)

hw/arm/Kconfig

@@ -397,6 +397,7 @@ config STM32F405_SOC
     bool
     select ARM_V7M
     select OR_IRQ
+    select STM32_RCC
     select STM32F4XX_SYSCFG
     select STM32F4XX_EXTI
 

hw/arm/stm32f405_soc.c

@@ -30,6 +30,7 @@
 #include "hw/qdev-clock.h"
 #include "hw/misc/unimp.h"
 
+#define RCC_ADDR                       0x40023800
 #define SYSCFG_ADD                     0x40013800
 static const uint32_t usart_addr[] = { 0x40011000, 0x40004400, 0x40004800,
                                        0x40004C00, 0x40005000, 0x40011400,
@@ -59,6 +60,8 @@ static void stm32f405_soc_initfn(Object *obj)
 
     object_initialize_child(obj, "armv7m", &s->armv7m, TYPE_ARMV7M);
 
+    object_initialize_child(obj, "rcc", &s->rcc, TYPE_STM32_RCC);
+
     object_initialize_child(obj, "syscfg", &s->syscfg, TYPE_STM32F4XX_SYSCFG);
 
     for (i = 0; i < STM_NUM_USARTS; i++) {
@@ -160,6 +163,14 @@ static void stm32f405_soc_realize(DeviceState *dev_soc, Error **errp)
         return;
     }
 
+    /* Reset and clock controller */
+    dev = DEVICE(&s->rcc);
+    if (!sysbus_realize(SYS_BUS_DEVICE(&s->rcc), errp)) {
+        return;
+    }
+    busdev = SYS_BUS_DEVICE(dev);
+    sysbus_mmio_map(busdev, 0, RCC_ADDR);
+
     /* System configuration controller */
     dev = DEVICE(&s->syscfg);
     if (!sysbus_realize(SYS_BUS_DEVICE(&s->syscfg), errp)) {
@@ -276,7 +287,6 @@ static void stm32f405_soc_realize(DeviceState *dev_soc, Error **errp)
     create_unimplemented_device("GPIOH",       0x40021C00, 0x400);
     create_unimplemented_device("GPIOI",       0x40022000, 0x400);
     create_unimplemented_device("CRC",         0x40023000, 0x400);
-    create_unimplemented_device("RCC",         0x40023800, 0x400);
     create_unimplemented_device("Flash Int",   0x40023C00, 0x400);
     create_unimplemented_device("BKPSRAM",     0x40024000, 0x400);
     create_unimplemented_device("DMA1",        0x40026000, 0x400);

include/hw/arm/stm32f405_soc.h

@@ -25,6 +25,7 @@
 #ifndef HW_ARM_STM32F405_SOC_H
 #define HW_ARM_STM32F405_SOC_H
 
+#include "hw/misc/stm32_rcc.h"
 #include "hw/misc/stm32f4xx_syscfg.h"
 #include "hw/timer/stm32f2xx_timer.h"
 #include "hw/char/stm32f2xx_usart.h"
@@ -55,6 +56,7 @@ struct STM32F405State {
 
     ARMv7MState armv7m;
 
+    STM32RccState rcc;
     STM32F4xxSyscfgState syscfg;
     STM32F4xxExtiState exti;
     STM32F2XXUsartState usart[STM_NUM_USARTS];