[Qemu-devel] [PATCH 2/4] mips: add Global Config Register block (part)

[Yongbok Kim <yongbok.kim@imgtec.com>]

Add part of GCR Block which Linux Kernel utilises and it is enough
to bring the GIC up.

Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>
---
 hw/mips/Makefile.objs |    2 +-
 hw/mips/mips_gcr.c    |  120 +++++++++++++++++++++++++++++++++++++++++++++++++
 hw/mips/mips_gcr.h    |   57 +++++++++++++++++++++++
 3 files changed, 178 insertions(+), 1 deletions(-)
 create mode 100644 hw/mips/mips_gcr.c
 create mode 100644 hw/mips/mips_gcr.h

diff --git a/hw/mips/Makefile.objs b/hw/mips/Makefile.objs
index 9633f3a..d247d95 100644
--- a/hw/mips/Makefile.objs
+++ b/hw/mips/Makefile.objs
@@ -1,5 +1,5 @@
 obj-y += mips_r4k.o mips_malta.o mips_mipssim.o
-obj-y += addr.o cputimer.o mips_int.o
+obj-y += addr.o cputimer.o mips_int.o mips_gcr.o
 obj-$(CONFIG_JAZZ) += mips_jazz.o
 obj-$(CONFIG_FULONG) += mips_fulong2e.o
 obj-y += gt64xxx_pci.o
diff --git a/hw/mips/mips_gcr.c b/hw/mips/mips_gcr.c
new file mode 100644
index 0000000..088ddef
--- /dev/null
+++ b/hw/mips/mips_gcr.c
@@ -0,0 +1,120 @@
+/*
+ * 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 "hw/hw.h"
+#include "hw/sysbus.h"
+#include "sysemu/sysemu.h"
+#include "hw/mips/mips_gcr.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_BASE_ADDR;
+    case GCR_REV_OFS:
+        return gcr->gcr_rev;
+    case GCR_GIC_BASE_OFS:
+        return gcr->gcr_gic_base;
+    case GCR_GIC_STATUS_OFS:
+        return GCR_GIC_STATUS_GICEX_MSK;
+    case GCR_CPC_STATUS_OFS:
+        return 0;
+    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 # cores - 1 */
+        return smp_cpus - 1;
+    case MIPS_CLCB_OFS + GCR_CL_OTHER_OFS:
+        return 0;
+
+    default:
+        qemu_log_mask(LOG_UNIMP,
+                "Warning *** unimplemented GCR read at offset 0x%" PRIx64 "\n",
+                addr);
+        return 0;
+    }
+    return 0ULL;
+}
+
+/* Write GCR registers */
+static void gcr_write(void *opaque, hwaddr addr, uint64_t data, unsigned size)
+{
+    /*
+     * MIPSGCRState *gcr = (MIPSGCRState *) opaque;
+     * */
+
+    switch (addr) {
+    case GCR_GIC_BASE_OFS:
+        break;
+    default:
+        qemu_log_mask(LOG_UNIMP,
+                "Warning *** unimplemented GCR write at offset 0x%" PRIx64 "\n",
+                addr);
+        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->gcr_mem, OBJECT(s), &gcr_ops, s,
+                          "mips-gcr", GCR_ADDRSPACE_SZ);
+    sysbus_init_mmio(sbd, &s->gcr_mem);
+}
+
+static Property mips_gcr_properties[] = {
+    DEFINE_PROP_INT32("num-cpu", MIPSGCRState, num_cpu, 1),
+    DEFINE_PROP_INT32("gcr-rev", MIPSGCRState, gcr_rev, 0x800),
+    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)
diff --git a/hw/mips/mips_gcr.h b/hw/mips/mips_gcr.h
new file mode 100644
index 0000000..2a9e1c0
--- /dev/null
+++ b/hw/mips/mips_gcr.h
@@ -0,0 +1,57 @@
+/*
+ * 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) 2015 Imagination Technologies
+ *
+ */
+
+#ifndef _MIPS_GCR_H
+#define _MIPS_GCR_H
+
+#define TYPE_MIPS_GCR "mips-gcr"
+#define MIPS_GCR(obj) OBJECT_CHECK(MIPSGCRState, (obj), TYPE_MIPS_GCR)
+
+#define GCR_BASE_ADDR           0x1fbf8000ULL
+#define GCR_ADDRSPACE_SZ        0x8000
+
+/* Offsets to register blocks */
+#define MIPS_GCB_OFS        0x0000 /* Global Control Block */
+#define MIPS_CLCB_OFS       0x2000 /* Core Local Control Block */
+#define MIPS_COCB_OFS       0x4000 /* Core Other Control Block */
+#define MIPS_GDB_OFS        0x6000 /* Global Debug Block */
+
+/* Global Control Block Register Map */
+#define GCR_CONFIG_OFS      0x0000
+#define GCR_BASE_OFS        0x0008
+#define GCR_REV_OFS         0x0030
+#define GCR_GIC_BASE_OFS    0x0080
+#define GCR_GIC_STATUS_OFS  0x00D0
+#define GCR_CPC_STATUS_OFS  0x00F0
+#define GCR_L2_CONFIG_OFS   0x0130
+
+/* Core Local and Core Other Block Register Map */
+#define GCR_CL_CONFIG_OFS   0x0010
+#define GCR_CL_OTHER_OFS    0x0018
+
+/* GCR_GIC_STATUS register fields */
+#define GCR_GIC_STATUS_GICEX_SHF    0
+#define GCR_GIC_STATUS_GICEX_MSK    ((0x1ULL) << GCR_GIC_STATUS_GICEX_SHF)
+
+/* GCR_L2_CONFIG register fields */
+#define GCR_L2_CONFIG_BYPASS_SHF    20
+#define GCR_L2_CONFIG_BYPASS_MSK    ((0x1ULL) << GCR_L2_CONFIG_BYPASS_SHF)
+
+
+typedef struct MIPSGCRState MIPSGCRState;
+struct MIPSGCRState {
+    SysBusDevice parent_obj;
+
+    target_ulong gcr_gic_base;
+    int32_t gcr_rev;
+    int32_t num_cpu;
+    MemoryRegion gcr_mem;
+} ;
+
+#endif /* _MIPS_GCR_H */
-- 
1.7.1