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-rw-r--r--hw/slavio_serial.c364
1 files changed, 364 insertions, 0 deletions
diff --git a/hw/slavio_serial.c b/hw/slavio_serial.c
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+++ b/hw/slavio_serial.c
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+/*
+ * QEMU Sparc SLAVIO serial port emulation
+ *
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ *
+ * 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.
+ */
+#include "vl.h"
+
+//#define DEBUG_SERIAL
+
+/* debug keyboard */
+//#define DEBUG_KBD
+
+/* debug keyboard : only mouse */
+//#define DEBUG_MOUSE
+
+/*
+ * This is the serial port, mouse and keyboard part of chip STP2001
+ * (Slave I/O), also produced as NCR89C105. See
+ * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C105.txt
+ *
+ * The serial ports implement full AMD AM8530 or Zilog Z8530 chips,
+ * mouse and keyboard ports don't implement all functions and they are
+ * only asynchronous. There is no DMA.
+ *
+ */
+
+typedef struct ChannelState {
+ int irq;
+ int reg;
+ int rxint, txint;
+ uint8_t rx, tx, wregs[16], rregs[16];
+ CharDriverState *chr;
+} ChannelState;
+
+struct SerialState {
+ struct ChannelState chn[2];
+};
+
+#define SERIAL_MAXADDR 7
+
+static void slavio_serial_update_irq(ChannelState *s)
+{
+ if ((s->wregs[1] & 1) && // interrupts enabled
+ (((s->wregs[1] & 2) && s->txint == 1) || // tx ints enabled, pending
+ ((((s->wregs[1] & 0x18) == 8) || ((s->wregs[1] & 0x18) == 0x10)) &&
+ s->rxint == 1) || // rx ints enabled, pending
+ ((s->wregs[15] & 0x80) && (s->rregs[0] & 0x80)))) { // break int e&p
+ pic_set_irq(s->irq, 1);
+ } else {
+ pic_set_irq(s->irq, 0);
+ }
+}
+
+static void slavio_serial_reset_chn(ChannelState *s)
+{
+ int i;
+
+ s->reg = 0;
+ for (i = 0; i < SERIAL_MAXADDR; i++) {
+ s->rregs[i] = 0;
+ s->wregs[i] = 0;
+ }
+ s->wregs[4] = 4;
+ s->wregs[9] = 0xc0;
+ s->wregs[11] = 8;
+ s->wregs[14] = 0x30;
+ s->wregs[15] = 0xf8;
+ s->rregs[0] = 0x44;
+ s->rregs[1] = 6;
+
+ s->rx = s->tx = 0;
+ s->rxint = s->txint = 0;
+}
+
+static void slavio_serial_reset(void *opaque)
+{
+ SerialState *s = opaque;
+ slavio_serial_reset_chn(&s->chn[0]);
+ slavio_serial_reset_chn(&s->chn[1]);
+}
+
+static void slavio_serial_mem_writeb(void *opaque, uint32_t addr, uint32_t val)
+{
+ SerialState *ser = opaque;
+ ChannelState *s;
+ uint32_t saddr;
+ int newreg, channel;
+
+ val &= 0xff;
+ saddr = (addr & 3) >> 1;
+ channel = (addr & SERIAL_MAXADDR) >> 2;
+ s = &ser->chn[channel];
+ switch (saddr) {
+ case 0:
+ newreg = 0;
+ switch (s->reg) {
+ case 0:
+ newreg = val & 7;
+ val &= 0x38;
+ switch (val) {
+ case 8:
+ s->reg |= 0x8;
+ break;
+ case 0x20:
+ s->rxint = 0;
+ break;
+ case 0x28:
+ s->txint = 0;
+ break;
+ default:
+ break;
+ }
+ break;
+ case 1 ... 8:
+ case 10 ... 15:
+ s->wregs[s->reg] = val;
+ break;
+ case 9:
+ switch (val & 0xc0) {
+ case 0:
+ default:
+ break;
+ case 0x40:
+ slavio_serial_reset_chn(&ser->chn[1]);
+ return;
+ case 0x80:
+ slavio_serial_reset_chn(&ser->chn[0]);
+ return;
+ case 0xc0:
+ slavio_serial_reset(ser);
+ return;
+ }
+ break;
+ default:
+ break;
+ }
+ if (s->reg == 0)
+ s->reg = newreg;
+ else
+ s->reg = 0;
+ break;
+ case 1:
+ if (s->wregs[5] & 8) { // tx enabled
+ s->tx = val;
+ if (s->chr)
+ qemu_chr_write(s->chr, &s->tx, 1);
+ s->txint = 1;
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+static uint32_t slavio_serial_mem_readb(void *opaque, uint32_t addr)
+{
+ SerialState *ser = opaque;
+ ChannelState *s;
+ uint32_t saddr;
+ uint32_t ret;
+ int channel;
+
+ saddr = (addr & 3) >> 1;
+ channel = (addr & SERIAL_MAXADDR) >> 2;
+ s = &ser->chn[channel];
+ switch (saddr) {
+ case 0:
+ ret = s->rregs[s->reg];
+ s->reg = 0;
+ return ret;
+ case 1:
+ s->rregs[0] &= ~1;
+ return s->rx;
+ default:
+ break;
+ }
+ return 0;
+}
+
+static int serial_can_receive(void *opaque)
+{
+ ChannelState *s = opaque;
+ if (((s->wregs[3] & 1) == 0) // Rx not enabled
+ || ((s->rregs[0] & 1) == 1)) // char already available
+ return 0;
+ else
+ return 1;
+}
+
+static void serial_receive_byte(ChannelState *s, int ch)
+{
+ s->rregs[0] |= 1;
+ s->rx = ch;
+ s->rxint = 1;
+ slavio_serial_update_irq(s);
+}
+
+static void serial_receive_break(ChannelState *s)
+{
+ s->rregs[0] |= 0x80;
+ slavio_serial_update_irq(s);
+}
+
+static void serial_receive1(void *opaque, const uint8_t *buf, int size)
+{
+ ChannelState *s = opaque;
+ serial_receive_byte(s, buf[0]);
+}
+
+static void serial_event(void *opaque, int event)
+{
+ ChannelState *s = opaque;
+ if (event == CHR_EVENT_BREAK)
+ serial_receive_break(s);
+}
+
+static CPUReadMemoryFunc *slavio_serial_mem_read[3] = {
+ slavio_serial_mem_readb,
+ slavio_serial_mem_readb,
+ slavio_serial_mem_readb,
+};
+
+static CPUWriteMemoryFunc *slavio_serial_mem_write[3] = {
+ slavio_serial_mem_writeb,
+ slavio_serial_mem_writeb,
+ slavio_serial_mem_writeb,
+};
+
+static void slavio_serial_save_chn(QEMUFile *f, ChannelState *s)
+{
+ qemu_put_be32s(f, &s->irq);
+ qemu_put_be32s(f, &s->reg);
+ qemu_put_be32s(f, &s->rxint);
+ qemu_put_be32s(f, &s->txint);
+ qemu_put_8s(f, &s->rx);
+ qemu_put_8s(f, &s->tx);
+ qemu_put_buffer(f, s->wregs, 16);
+ qemu_put_buffer(f, s->rregs, 16);
+}
+
+static void slavio_serial_save(QEMUFile *f, void *opaque)
+{
+ SerialState *s = opaque;
+
+ slavio_serial_save_chn(f, &s->chn[0]);
+ slavio_serial_save_chn(f, &s->chn[1]);
+}
+
+static int slavio_serial_load_chn(QEMUFile *f, ChannelState *s, int version_id)
+{
+ if (version_id != 1)
+ return -EINVAL;
+
+ qemu_get_be32s(f, &s->irq);
+ qemu_get_be32s(f, &s->reg);
+ qemu_get_be32s(f, &s->rxint);
+ qemu_get_be32s(f, &s->txint);
+ qemu_get_8s(f, &s->rx);
+ qemu_get_8s(f, &s->tx);
+ qemu_get_buffer(f, s->wregs, 16);
+ qemu_get_buffer(f, s->rregs, 16);
+ return 0;
+}
+
+static int slavio_serial_load(QEMUFile *f, void *opaque, int version_id)
+{
+ SerialState *s = opaque;
+ int ret;
+
+ ret = slavio_serial_load_chn(f, &s->chn[0], version_id);
+ if (ret != 0)
+ return ret;
+ ret = slavio_serial_load_chn(f, &s->chn[1], version_id);
+ return ret;
+
+}
+
+SerialState *slavio_serial_init(int base, int irq, CharDriverState *chr1, CharDriverState *chr2)
+{
+ int slavio_serial_io_memory;
+ SerialState *s;
+
+ s = qemu_mallocz(sizeof(SerialState));
+ if (!s)
+ return NULL;
+ s->chn[0].irq = irq;
+ s->chn[1].irq = irq;
+ s->chn[0].chr = chr1;
+ s->chn[1].chr = chr2;
+
+ slavio_serial_io_memory = cpu_register_io_memory(0, slavio_serial_mem_read, slavio_serial_mem_write, s);
+ cpu_register_physical_memory(base, SERIAL_MAXADDR, slavio_serial_io_memory);
+
+ if (chr1) {
+ qemu_chr_add_read_handler(chr1, serial_can_receive, serial_receive1, &s->chn[0]);
+ qemu_chr_add_event_handler(chr1, serial_event);
+ }
+ if (chr2) {
+ qemu_chr_add_read_handler(chr2, serial_can_receive, serial_receive1, &s->chn[1]);
+ qemu_chr_add_event_handler(chr2, serial_event);
+ }
+ register_savevm("slavio_serial", base, 1, slavio_serial_save, slavio_serial_load, s);
+ qemu_register_reset(slavio_serial_reset, s);
+ slavio_serial_reset(s);
+ return s;
+}
+
+static void sunkbd_event(void *opaque, int ch)
+{
+ ChannelState *s = opaque;
+ // XXX: PC -> Sun Type 5 translation?
+ serial_receive_byte(s, ch);
+}
+
+static void sunmouse_event(void *opaque,
+ int dx, int dy, int dz, int buttons_state)
+{
+ ChannelState *s = opaque;
+ int ch;
+
+ // XXX
+ ch = 0x42;
+ serial_receive_byte(s, ch);
+}
+
+void slavio_serial_ms_kbd_init(int base, int irq)
+{
+ int slavio_serial_io_memory;
+ SerialState *s;
+
+ s = qemu_mallocz(sizeof(SerialState));
+ if (!s)
+ return;
+ s->chn[0].irq = irq;
+ s->chn[1].irq = irq;
+ s->chn[0].chr = NULL;
+ s->chn[1].chr = NULL;
+
+ slavio_serial_io_memory = cpu_register_io_memory(0, slavio_serial_mem_read, slavio_serial_mem_write, s);
+ cpu_register_physical_memory(base, SERIAL_MAXADDR, slavio_serial_io_memory);
+
+ qemu_add_kbd_event_handler(sunkbd_event, &s->chn[0]);
+ qemu_add_mouse_event_handler(sunmouse_event, &s->chn[1]);
+ qemu_register_reset(slavio_serial_reset, s);
+ slavio_serial_reset(s);
+}
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