ppc/pnv: Add OCC model stub with interrupt support

The OCC is an on-chip microcontroller based on a ppc405 core used
for various power management tasks. It comes with a pile of additional
hardware sitting on the PIB (aka XSCOM bus). At this point we don't
emulate it (nor plan to do so). However there is one facility which
is provided by the surrounding hardware that we do need, which is the
interrupt generation facility. OPAL uses it to send itself interrupts
under some circumstances and there are other uses around the corner.

So this implement just enough to support this.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[clg: - updated for qemu-2.9
      - changed the XSCOM interface to fit new model
      - QOMified the model ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

3 files changed, 43 insertions, 0 deletions

diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
index a3ed2ee647..b45a0d91c8 100644
--- a/include/hw/ppc/pnv.h
+++ b/include/hw/ppc/pnv.h
@@ -23,6 +23,7 @@
 #include "hw/sysbus.h"
 #include "hw/ppc/pnv_lpc.h"
 #include "hw/ppc/pnv_psi.h"
+#include "hw/ppc/pnv_occ.h"
 
 #define TYPE_PNV_CHIP "powernv-chip"
 #define PNV_CHIP(obj) OBJECT_CHECK(PnvChip, (obj), TYPE_PNV_CHIP)
@@ -59,6 +60,7 @@ typedef struct PnvChip {
 
     PnvLpcController lpc;
     PnvPsi       psi;
+    PnvOCC       occ;
 } PnvChip;
 
 typedef struct PnvChipClass {
diff --git a/include/hw/ppc/pnv_occ.h b/include/hw/ppc/pnv_occ.h
new file mode 100644
index 0000000000..f8ec330abf
--- /dev/null
+++ b/include/hw/ppc/pnv_occ.h
@@ -0,0 +1,38 @@
+/*
+ * QEMU PowerPC PowerNV Emulation of a few OCC related registers
+ *
+ * Copyright (c) 2015-2017, IBM Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _PPC_PNV_OCC_H
+#define _PPC_PNV_OCC_H
+
+#define TYPE_PNV_OCC "pnv-occ"
+#define PNV_OCC(obj) OBJECT_CHECK(PnvOCC, (obj), TYPE_PNV_OCC)
+
+typedef struct PnvPsi PnvPsi;
+
+typedef struct PnvOCC {
+    DeviceState xd;
+
+    /* OCC Misc interrupt */
+    uint64_t occmisc;
+
+    PnvPsi *psi;
+
+    MemoryRegion xscom_regs;
+} PnvOCC;
+
+#endif /* _PPC_PNV_OCC_H */
diff --git a/include/hw/ppc/pnv_xscom.h b/include/hw/ppc/pnv_xscom.h
index 15f7fdb147..3757b2cab9 100644
--- a/include/hw/ppc/pnv_xscom.h
+++ b/include/hw/ppc/pnv_xscom.h
@@ -63,6 +63,9 @@ typedef struct PnvXScomInterfaceClass {
 #define PNV_XSCOM_PSIHB_BASE      0x2010900
 #define PNV_XSCOM_PSIHB_SIZE      0x20
 
+#define PNV_XSCOM_OCC_BASE        0x0066000
+#define PNV_XSCOM_OCC_SIZE        0x6000
+
 extern void pnv_xscom_realize(PnvChip *chip, Error **errp);
 extern int pnv_xscom_populate(PnvChip *chip, void *fdt, int offset);