hw/arm/raspi: add a skeleton implementation of the CPRMAN

The BCM2835 CPRMAN is the clock manager of the SoC. It is composed of a
main oscillator, and several sub-components (PLLs, multiplexers, ...) to
generate the BCM2835 clock tree.

This commit adds a skeleton of the CPRMAN, with a dummy register
read/write implementation. It embeds the main oscillator (xosc) from
which all the clocks will be derived.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Luc Michel <luc@lmichel.fr>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

include/hw/misc/bcm2835_cprman.h

@@ -0,0 +1,37 @@
+/*
+ * BCM2835 CPRMAN clock manager
+ *
+ * Copyright (c) 2020 Luc Michel <luc@lmichel.fr>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef HW_MISC_CPRMAN_H
+#define HW_MISC_CPRMAN_H
+
+#include "hw/sysbus.h"
+#include "hw/qdev-clock.h"
+
+#define TYPE_BCM2835_CPRMAN "bcm2835-cprman"
+
+typedef struct BCM2835CprmanState BCM2835CprmanState;
+
+DECLARE_INSTANCE_CHECKER(BCM2835CprmanState, CPRMAN,
+                         TYPE_BCM2835_CPRMAN)
+
+#define CPRMAN_NUM_REGS (0x2000 / sizeof(uint32_t))
+
+struct BCM2835CprmanState {
+    /*< private >*/
+    SysBusDevice parent_obj;
+
+    /*< public >*/
+    MemoryRegion iomem;
+
+    uint32_t regs[CPRMAN_NUM_REGS];
+    uint32_t xosc_freq;
+
+    Clock *xosc;
+};
+
+#endif