[RFC PATCH 2/3] hw/misc: Add MIPS Trickbox device

[Jiaxun Yang <jiaxun.yang@flygoat.com>]

MIPS Trickbox is a emulated device present in MIPS's proprietary
simulators for decadeds. It's capable for managing simulator status,
signaling interrupts, doing DMA and EJTAG stimulations.

For now we just borrow this device and implement power management
related functions.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
 hw/misc/Kconfig                 |  3 +
 hw/misc/meson.build             |  1 +
 hw/misc/mips_trickbox.c         | 97 +++++++++++++++++++++++++++++++++
 hw/misc/trace-events            |  4 ++
 include/hw/misc/mips_trickbox.h | 41 ++++++++++++++
 5 files changed, 146 insertions(+)
 create mode 100644 hw/misc/mips_trickbox.c
 create mode 100644 include/hw/misc/mips_trickbox.h

diff --git a/hw/misc/Kconfig b/hw/misc/Kconfig
index cbabe9f78c..fa92c439ec 100644
--- a/hw/misc/Kconfig
+++ b/hw/misc/Kconfig
@@ -89,6 +89,9 @@ config STM32F4XX_EXTI
 config MIPS_ITU
     bool
 
+config MIPS_TRICKBOX
+    bool
+
 config MPS2_FPGAIO
     bool
     select LED
diff --git a/hw/misc/meson.build b/hw/misc/meson.build
index 95268eddc0..116eff8890 100644
--- a/hw/misc/meson.build
+++ b/hw/misc/meson.build
@@ -133,6 +133,7 @@ specific_ss.add(when: 'CONFIG_MAC_VIA', if_true: files('mac_via.c'))
 
 specific_ss.add(when: 'CONFIG_MIPS_CPS', if_true: files('mips_cmgcr.c', 'mips_cpc.c'))
 specific_ss.add(when: 'CONFIG_MIPS_ITU', if_true: files('mips_itu.c'))
+specific_ss.add(when: 'CONFIG_MIPS_TRICKBOX', if_true: files('mips_trickbox.c'))
 
 specific_ss.add(when: 'CONFIG_SBSA_REF', if_true: files('sbsa_ec.c'))
 
diff --git a/hw/misc/mips_trickbox.c b/hw/misc/mips_trickbox.c
new file mode 100644
index 0000000000..20349b774b
--- /dev/null
+++ b/hw/misc/mips_trickbox.c
@@ -0,0 +1,97 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.0-or-later
+ *
+ * MIPS Trickbox
+ */
+
+#include "qemu/osdep.h"
+#include "hw/sysbus.h"
+#include "qapi/error.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "trace.h"
+#include "sysemu/runstate.h"
+#include "hw/misc/mips_trickbox.h"
+
+static uint64_t mips_trickbox_read(void *opaque, hwaddr addr, unsigned int size)
+{
+    uint64_t value = 0;
+
+    qemu_log_mask(LOG_UNIMP,
+                    "%s: unimplemented register read 0x%02"HWADDR_PRIx"\n",
+                    __func__, addr);
+    trace_mips_trickbox_read(size, value);
+
+    return 0;
+}
+
+static void mips_trickbox_write(void *opaque, hwaddr addr,
+           uint64_t val64, unsigned int size)
+{
+    trace_mips_trickbox_write(size, val64);
+
+    switch (addr) {
+    case REG_SIM_CMD:
+        switch (val64 & 0xffffffff) {
+        case TRICK_PANIC:
+            qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_PANIC);
+            break;
+        case TRICK_HALT:
+            qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
+            break;
+        case TRICK_SUSPEND:
+            qemu_system_suspend_request();
+            break;
+        case TRICK_RESET:
+            qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
+            break;
+        case TRICK_PASS_MIPS:
+        case TRICK_PASS_NANOMIPS:
+            exit(EXIT_SUCCESS);
+            break;
+        case TRICK_FAIL_MIPS:
+        case TRICK_FAIL_NANOMIPS:
+            exit(EXIT_FAILURE);
+            break;
+        }
+        break;
+    default:
+        qemu_log_mask(LOG_UNIMP,
+                      "%s: unimplemented register write 0x%02"HWADDR_PRIx"\n",
+                      __func__, addr);
+        break;
+    }
+}
+
+static const MemoryRegionOps mips_trickbox_ops = {
+    .read = mips_trickbox_read,
+    .write = mips_trickbox_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .valid = {
+        .min_access_size = 2,
+        .max_access_size = 4
+    }
+};
+
+static void mips_trickbox_init(Object *obj)
+{
+    MIPSTrickboxState *s = MIPS_TRICKBOX(obj);
+
+    memory_region_init_io(&s->mmio, obj, &mips_trickbox_ops, s,
+                          TYPE_MIPS_TRICKBOX, 0x100);
+    sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
+}
+
+static const TypeInfo mips_trickbox_info = {
+    .name          = TYPE_MIPS_TRICKBOX,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(MIPSTrickboxState),
+    .instance_init = mips_trickbox_init,
+};
+
+static void mips_trickbox_register_types(void)
+{
+    type_register_static(&mips_trickbox_info);
+}
+
+type_init(mips_trickbox_register_types)
diff --git a/hw/misc/trace-events b/hw/misc/trace-events
index c18bc0605e..6df0e42450 100644
--- a/hw/misc/trace-events
+++ b/hw/misc/trace-events
@@ -274,3 +274,7 @@ virt_ctrl_instance_init(void *dev) "ctrl: %p"
 lasi_chip_mem_valid(uint64_t addr, uint32_t val) "access to addr 0x%"PRIx64" is %d"
 lasi_chip_read(uint64_t addr, uint32_t val) "addr 0x%"PRIx64" val 0x%08x"
 lasi_chip_write(uint64_t addr, uint32_t val) "addr 0x%"PRIx64" val 0x%08x"
+
+# mips_trickbox.c
+mips_trickbox_read(uint64_t addr, uint32_t val) "addr 0x%"PRIx64" val 0x%08x"
+mips_trickbox_write(uint64_t addr, uint32_t val) "addr 0x%"PRIx64" val 0x%08x"
diff --git a/include/hw/misc/mips_trickbox.h b/include/hw/misc/mips_trickbox.h
new file mode 100644
index 0000000000..386a767937
--- /dev/null
+++ b/include/hw/misc/mips_trickbox.h
@@ -0,0 +1,41 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.0-or-later
+ *
+ * MIPS Trickbox
+ */
+
+
+#ifndef HW_MIPS_TRICKBOX_H
+#define HW_MIPS_TRICKBOX_H
+
+#include "hw/sysbus.h"
+#include "qom/object.h"
+
+#define TYPE_MIPS_TRICKBOX "mips.trickbox"
+
+typedef struct MIPSTrickboxState MIPSTrickboxState;
+DECLARE_INSTANCE_CHECKER(MIPSTrickboxState, MIPS_TRICKBOX,
+                         TYPE_MIPS_TRICKBOX)
+
+struct MIPSTrickboxState {
+    /*< private >*/
+    SysBusDevice parent_obj;
+
+    /*< public >*/
+    MemoryRegion mmio;
+};
+
+#define REG_SIM_CMD 0x0
+
+enum {
+    TRICK_PANIC = 1,
+    TRICK_HALT = 2,
+    TRICK_SUSPEND = 3,
+    TRICK_RESET = 4,
+    TRICK_FAIL_MIPS = 0x2c00abc1,
+    TRICK_PASS_MIPS = 0x2c00abc2,
+    TRICK_FAIL_NANOMIPS = 0x80005bc1,
+    TRICK_PASS_NANOMIPS = 0x80005bc2
+};
+
+#endif
-- 
2.37.1 (Apple Git-137.1)