ppc/pnv: Add initial P9/10 SBE model

The SBE (Self Boot Engine) are on-chip microcontrollers that perform
early boot steps, as well as provide some runtime facilities (e.g.,
timer, secure register access, MPIPL). The latter facilities are
accessed mostly via a message system called SBEFIFO.

This driver provides initial emulation for the SBE runtime registers
and a very basic SBEFIFO implementation that provides the timer
command. This covers the basic SBE behaviour expected by skiboot when
booting.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20220811093726.1442343-1-npiggin@gmail.com>
[danielhb: fixed SBE_HOST_RESPONSE_MASK long line]
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

3 files changed, 70 insertions, 0 deletions

diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
index b991194223..37c303bf36 100644
--- a/include/hw/ppc/pnv.h
+++ b/include/hw/ppc/pnv.h
@@ -27,6 +27,7 @@
 #include "hw/ppc/pnv_pnor.h"
 #include "hw/ppc/pnv_psi.h"
 #include "hw/ppc/pnv_occ.h"
+#include "hw/ppc/pnv_sbe.h"
 #include "hw/ppc/pnv_homer.h"
 #include "hw/ppc/pnv_xive.h"
 #include "hw/ppc/pnv_core.h"
@@ -100,6 +101,7 @@ struct Pnv9Chip {
     Pnv9Psi      psi;
     PnvLpcController lpc;
     PnvOCC       occ;
+    PnvSBE       sbe;
     PnvHomer     homer;
 
     uint32_t     nr_quads;
@@ -129,6 +131,7 @@ struct Pnv10Chip {
     Pnv9Psi      psi;
     PnvLpcController lpc;
     PnvOCC       occ;
+    PnvSBE       sbe;
     PnvHomer     homer;
 
     uint32_t     nr_quads;
diff --git a/include/hw/ppc/pnv_sbe.h b/include/hw/ppc/pnv_sbe.h
new file mode 100644
index 0000000000..f54a3ae9ba
--- /dev/null
+++ b/include/hw/ppc/pnv_sbe.h
@@ -0,0 +1,55 @@
+/*
+ * QEMU PowerPC PowerNV Emulation of some SBE behaviour
+ *
+ * Copyright (c) 2022, 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 2.1 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_SBE_H
+#define PPC_PNV_SBE_H
+
+#include "qom/object.h"
+
+#define TYPE_PNV_SBE "pnv-sbe"
+OBJECT_DECLARE_TYPE(PnvSBE, PnvSBEClass, PNV_SBE)
+#define TYPE_PNV9_SBE TYPE_PNV_SBE "-POWER9"
+DECLARE_INSTANCE_CHECKER(PnvSBE, PNV9_SBE, TYPE_PNV9_SBE)
+#define TYPE_PNV10_SBE TYPE_PNV_SBE "-POWER10"
+DECLARE_INSTANCE_CHECKER(PnvSBE, PNV10_SBE, TYPE_PNV10_SBE)
+
+struct PnvSBE {
+    DeviceState xd;
+
+    uint64_t mbox[8];
+    uint64_t sbe_doorbell;
+    uint64_t host_doorbell;
+
+    qemu_irq psi_irq;
+    QEMUTimer *timer;
+
+    MemoryRegion xscom_mbox_regs;
+    MemoryRegion xscom_ctrl_regs;
+};
+
+struct PnvSBEClass {
+    DeviceClass parent_class;
+
+    int xscom_ctrl_size;
+    int xscom_mbox_size;
+    const MemoryRegionOps *xscom_ctrl_ops;
+    const MemoryRegionOps *xscom_mbox_ops;
+};
+
+#endif /* PPC_PNV_SBE_H */
diff --git a/include/hw/ppc/pnv_xscom.h b/include/hw/ppc/pnv_xscom.h
index 7c7440de0c..c6e9ef8dd2 100644
--- a/include/hw/ppc/pnv_xscom.h
+++ b/include/hw/ppc/pnv_xscom.h
@@ -92,6 +92,12 @@ struct PnvXScomInterfaceClass {
 #define PNV9_XSCOM_OCC_BASE       PNV_XSCOM_OCC_BASE
 #define PNV9_XSCOM_OCC_SIZE       0x8000
 
+#define PNV9_XSCOM_SBE_CTRL_BASE  0x00050008
+#define PNV9_XSCOM_SBE_CTRL_SIZE  0x1
+
+#define PNV9_XSCOM_SBE_MBOX_BASE  0x000D0050
+#define PNV9_XSCOM_SBE_MBOX_SIZE  0x16
+
 #define PNV9_XSCOM_PBA_BASE       0x5012b00
 #define PNV9_XSCOM_PBA_SIZE       0x40
 
@@ -134,6 +140,12 @@ struct PnvXScomInterfaceClass {
 #define PNV10_XSCOM_OCC_BASE       PNV9_XSCOM_OCC_BASE
 #define PNV10_XSCOM_OCC_SIZE       PNV9_XSCOM_OCC_SIZE
 
+#define PNV10_XSCOM_SBE_CTRL_BASE  PNV9_XSCOM_SBE_CTRL_BASE
+#define PNV10_XSCOM_SBE_CTRL_SIZE  PNV9_XSCOM_SBE_CTRL_SIZE
+
+#define PNV10_XSCOM_SBE_MBOX_BASE  PNV9_XSCOM_SBE_MBOX_BASE
+#define PNV10_XSCOM_SBE_MBOX_SIZE  PNV9_XSCOM_SBE_MBOX_SIZE
+
 #define PNV10_XSCOM_PBA_BASE       0x01010CDA
 #define PNV10_XSCOM_PBA_SIZE       0x40