[Qemu-devel] [PATCH 07/17] lm32: juart model

[Michael Walle <michael@walle.cc>]

This patch adds the JTAG UART model. It is accessed through special control
registers and opcodes. Therefore the translation uses callbacks to this
model.

Signed-off-by: Michael Walle <michael@walle.cc>
---
 hw/lm32_juart.c |  151 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/lm32_juart.h |   10 ++++
 trace-events    |    6 ++
 3 files changed, 167 insertions(+), 0 deletions(-)
 create mode 100644 hw/lm32_juart.c
 create mode 100644 hw/lm32_juart.h

diff --git a/hw/lm32_juart.c b/hw/lm32_juart.c
new file mode 100644
index 0000000..fdeeefd
--- /dev/null
+++ b/hw/lm32_juart.c
@@ -0,0 +1,151 @@
+/*
+ *  LatticeMico32 JTAG UART model.
+ *
+ *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
+ *
+ * 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/>.
+ */
+
+#include "hw.h"
+#include "sysbus.h"
+#include "trace.h"
+#include "qemu-char.h"
+
+#include "lm32_juart.h"
+
+enum {
+    LM32_JUART_MIN_SAVE_VERSION = 0,
+    LM32_JUART_CURRENT_SAVE_VERSION = 0,
+    LM32_JUART_MAX_SAVE_VERSION = 0,
+};
+
+enum {
+    JTX_FULL = (1<<8),
+};
+
+enum {
+    JRX_FULL = (1<<8),
+};
+
+struct LM32JuartState {
+    SysBusDevice busdev;
+    CharDriverState *chr;
+
+    uint32_t jtx;
+    uint32_t jrx;
+};
+typedef struct LM32JuartState LM32JuartState;
+
+uint32_t lm32_juart_get_jtx(CPUState *env)
+{
+    LM32JuartState *s = env->juart_env;
+
+    trace_lm32_juart_get_jtx(s->jtx);
+    return s->jtx;
+}
+
+uint32_t lm32_juart_get_jrx(CPUState *env)
+{
+    LM32JuartState *s = env->juart_env;
+
+    trace_lm32_juart_get_jrx(s->jrx);
+    return s->jrx;
+}
+
+void lm32_juart_set_jtx(CPUState *env, uint32_t jtx)
+{
+    LM32JuartState *s = env->juart_env;
+    unsigned char ch = jtx & 0xff;
+
+    trace_lm32_juart_set_jtx(s->jtx);
+
+    s->jtx = jtx;
+    if (s->chr) {
+        qemu_chr_write(s->chr, &ch, 1);
+    }
+}
+
+void lm32_juart_set_jrx(CPUState *env, uint32_t jtx)
+{
+    LM32JuartState *s = env->juart_env;
+
+    trace_lm32_juart_set_jrx(s->jrx);
+    env->juart_env->jrx &= ~JRX_FULL;
+}
+
+static void juart_rx(void *opaque, const uint8_t *buf, int size)
+{
+    LM32JuartState *s = opaque;
+
+    s->jrx = *buf | JRX_FULL;
+}
+
+static int juart_can_rx(void *opaque)
+{
+    LM32JuartState *s = opaque;
+
+    return !(s->jrx & JRX_FULL);
+}
+
+static void juart_event(void *opaque, int event)
+{
+}
+
+static void juart_reset(void *opaque)
+{
+    LM32JuartState *s = opaque;
+
+    s->jtx = 0;
+    s->jrx = 0;
+}
+
+static int lm32_juart_init(SysBusDevice *dev)
+{
+    LM32JuartState *s = FROM_SYSBUS(typeof(*s), dev);
+
+    s->chr = qdev_init_chardev(&dev->qdev);
+    if (s->chr) {
+        qemu_chr_add_handlers(s->chr, juart_can_rx, juart_rx, juart_event, s);
+    }
+
+    qemu_register_reset(juart_reset, s);
+
+    return 0;
+}
+
+static const VMStateDescription vmstate_lm32_juart = {
+    .name = "lm32-juart",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields      = (VMStateField[]) {
+        VMSTATE_UINT32(jtx, LM32JuartState),
+        VMSTATE_UINT32(jrx, LM32JuartState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static SysBusDeviceInfo lm32_juart_info = {
+    .init = lm32_juart_init,
+    .qdev.name = "lm32-juart",
+    .qdev.size = sizeof(LM32JuartState),
+    .qdev.vmsd  = &vmstate_lm32_juart,
+};
+
+static void lm32_juart_register(void)
+{
+    sysbus_register_withprop(&lm32_juart_info);
+}
+
+device_init(lm32_juart_register)
diff --git a/hw/lm32_juart.h b/hw/lm32_juart.h
new file mode 100644
index 0000000..5dc0338
--- /dev/null
+++ b/hw/lm32_juart.h
@@ -0,0 +1,10 @@
+#ifndef __LM32_JUART
+#define __LM32_JUART
+
+#include "qemu-common.h"
+
+uint32_t lm32_juart_get_jtx(CPUState *env);
+uint32_t lm32_juart_get_jrx(CPUState *env);
+void lm32_juart_set_jtx(CPUState *env, uint32_t jtx);
+void lm32_juart_set_jrx(CPUState *env, uint32_t jrx);
+#endif
diff --git a/trace-events b/trace-events
index 377bc25..c82588f 100644
--- a/trace-events
+++ b/trace-events
@@ -222,3 +222,9 @@ disable lm32_pic_set_im(uint32_t im) "im=%08x"
 disable lm32_pic_set_ip(uint32_t ip) "ip=%08x"
 disable lm32_pic_get_im(uint32_t im) "im=%08x"
 disable lm32_pic_get_ip(uint32_t ip) "ip=%08x"
+
+# hw/lm32_juart.c
+disable lm32_juart_get_jtx(uint32_t value) "value=%08x"
+disable lm32_juart_set_jtx(uint32_t value) "value=%08x"
+disable lm32_juart_get_jrx(uint32_t value) "value=%08x"
+disable lm32_juart_set_jrx(uint32_t value) "value=%08x"
-- 
1.7.2.3