hw/mips: add initial Global Config Register support

Add initial GCR support to indicate number of VPs present in the system,
L2 bypass mode and revision number.

Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>
[leon.alrae@imgtec.com:
 * removed GIC part,
 * changed commit message,
 * replaced %lx format spec. with PRIx64,
 * renamed mips_gcr.{c,h} to mips_cmgcr.{c,h},
 * replaced CONFIG_MIPS_GIC with CONFIG_MIPS_CPS]
Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>

2 files changed, 108 insertions, 0 deletions

diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs
index 44ac2e1..b00a5d0 100644
--- a/hw/misc/Makefile.objs
+++ b/hw/misc/Makefile.objs
@@ -43,6 +43,7 @@ obj-$(CONFIG_SLAVIO) += slavio_misc.o
 obj-$(CONFIG_ZYNQ) += zynq_slcr.o
 obj-$(CONFIG_ZYNQ) += zynq-xadc.o
 obj-$(CONFIG_STM32F2XX_SYSCFG) += stm32f2xx_syscfg.o
+obj-$(CONFIG_MIPS_CPS) += mips_cmgcr.o
 
 obj-$(CONFIG_PVPANIC) += pvpanic.o
 obj-$(CONFIG_EDU) += edu.o
diff --git a/hw/misc/mips_cmgcr.c b/hw/misc/mips_cmgcr.c
new file mode 100644
index 0000000..4c93a133
--- /dev/null
+++ b/hw/misc/mips_cmgcr.c
@@ -0,0 +1,107 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2012  MIPS Technologies, Inc.  All rights reserved.
+ * Authors: Sanjay Lal <sanjayl@kymasys.com>
+ *
+ * Copyright (C) 2015 Imagination Technologies
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/hw.h"
+#include "hw/sysbus.h"
+#include "sysemu/sysemu.h"
+#include "hw/misc/mips_cmgcr.h"
+
+/* Read GCR registers */
+static uint64_t gcr_read(void *opaque, hwaddr addr, unsigned size)
+{
+    MIPSGCRState *gcr = (MIPSGCRState *) opaque;
+
+    switch (addr) {
+    /* Global Control Block Register */
+    case GCR_CONFIG_OFS:
+        /* Set PCORES to 0 */
+        return 0;
+    case GCR_BASE_OFS:
+        return gcr->gcr_base;
+    case GCR_REV_OFS:
+        return gcr->gcr_rev;
+    case GCR_L2_CONFIG_OFS:
+        /* L2 BYPASS */
+        return GCR_L2_CONFIG_BYPASS_MSK;
+        /* Core-Local and Core-Other Control Blocks */
+    case MIPS_CLCB_OFS + GCR_CL_CONFIG_OFS:
+    case MIPS_COCB_OFS + GCR_CL_CONFIG_OFS:
+        /* Set PVP to # of VPs - 1 */
+        return gcr->num_vps - 1;
+    case MIPS_CLCB_OFS + GCR_CL_OTHER_OFS:
+        return 0;
+    default:
+        qemu_log_mask(LOG_UNIMP, "Read %d bytes at GCR offset 0x%" HWADDR_PRIx
+                      "\n", size, addr);
+        return 0;
+    }
+    return 0;
+}
+
+/* Write GCR registers */
+static void gcr_write(void *opaque, hwaddr addr, uint64_t data, unsigned size)
+{
+    switch (addr) {
+    default:
+        qemu_log_mask(LOG_UNIMP, "Write %d bytes at GCR offset 0x%" HWADDR_PRIx
+                      " 0x%" PRIx64 "\n", size, addr, data);
+        break;
+    }
+}
+
+static const MemoryRegionOps gcr_ops = {
+    .read = gcr_read,
+    .write = gcr_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .impl = {
+        .max_access_size = 8,
+    },
+};
+
+static void mips_gcr_init(Object *obj)
+{
+    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+    MIPSGCRState *s = MIPS_GCR(obj);
+
+    memory_region_init_io(&s->iomem, OBJECT(s), &gcr_ops, s,
+                          "mips-gcr", GCR_ADDRSPACE_SZ);
+    sysbus_init_mmio(sbd, &s->iomem);
+}
+
+static Property mips_gcr_properties[] = {
+    DEFINE_PROP_INT32("num-vp", MIPSGCRState, num_vps, 1),
+    DEFINE_PROP_INT32("gcr-rev", MIPSGCRState, gcr_rev, 0x800),
+    DEFINE_PROP_UINT64("gcr-base", MIPSGCRState, gcr_base, GCR_BASE_ADDR),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void mips_gcr_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    dc->props = mips_gcr_properties;
+}
+
+static const TypeInfo mips_gcr_info = {
+    .name          = TYPE_MIPS_GCR,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(MIPSGCRState),
+    .instance_init = mips_gcr_init,
+    .class_init    = mips_gcr_class_init,
+};
+
+static void mips_gcr_register_types(void)
+{
+    type_register_static(&mips_gcr_info);
+}
+
+type_init(mips_gcr_register_types)