1 files changed, 103 insertions, 0 deletions
diff --git a/hw/serial.h b/hw/serial.h
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+/*
+ * QEMU 16550A UART emulation
+ *
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ * Copyright (c) 2008 Citrix Systems, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef HW_SERIAL_H
+#define HW_SERIAL_H 1
+
+#include "hw.h"
+#include "sysemu/sysemu.h"
+#include "exec/memory.h"
+
+#define UART_FIFO_LENGTH    16      /* 16550A Fifo Length */
+
+typedef struct SerialFIFO {
+    uint8_t data[UART_FIFO_LENGTH];
+    uint8_t count;
+    uint8_t itl;                        /* Interrupt Trigger Level */
+    uint8_t tail;
+    uint8_t head;
+} SerialFIFO;
+
+struct SerialState {
+    uint16_t divider;
+    uint8_t rbr; /* receive register */
+    uint8_t thr; /* transmit holding register */
+    uint8_t tsr; /* transmit shift register */
+    uint8_t ier;
+    uint8_t iir; /* read only */
+    uint8_t lcr;
+    uint8_t mcr;
+    uint8_t lsr; /* read only */
+    uint8_t msr; /* read only */
+    uint8_t scr;
+    uint8_t fcr;
+    uint8_t fcr_vmstate; /* we can't write directly this value
+                            it has side effects */
+    /* NOTE: this hidden state is necessary for tx irq generation as
+       it can be reset while reading iir */
+    int thr_ipending;
+    qemu_irq irq;
+    CharDriverState *chr;
+    int last_break_enable;
+    int it_shift;
+    int baudbase;
+    int tsr_retry;
+    uint32_t wakeup;
+
+    /* Time when the last byte was successfully sent out of the tsr */
+    uint64_t last_xmit_ts;
+    SerialFIFO recv_fifo;
+    SerialFIFO xmit_fifo;
+
+    struct QEMUTimer *fifo_timeout_timer;
+    int timeout_ipending;           /* timeout interrupt pending state */
+    struct QEMUTimer *transmit_timer;
+
+
+    uint64_t char_transmit_time;    /* time to transmit a char in ticks */
+    int poll_msl;
+
+    struct QEMUTimer *modem_status_poll;
+    MemoryRegion io;
+};
+
+extern const VMStateDescription vmstate_serial;
+extern const MemoryRegionOps serial_io_ops;
+
+void serial_init_core(SerialState *s);
+void serial_exit_core(SerialState *s);
+void serial_set_frequency(SerialState *s, uint32_t frequency);
+
+/* legacy pre qom */
+SerialState *serial_init(int base, qemu_irq irq, int baudbase,
+                         CharDriverState *chr, MemoryRegion *system_io);
+SerialState *serial_mm_init(MemoryRegion *address_space,
+                            hwaddr base, int it_shift,
+                            qemu_irq irq, int baudbase,
+                            CharDriverState *chr, enum device_endian end);
+
+/* serial-isa.c */
+bool serial_isa_init(ISABus *bus, int index, CharDriverState *chr);
+
+#endif