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-rw-r--r--hw/syborg_serial.c329
1 files changed, 0 insertions, 329 deletions
diff --git a/hw/syborg_serial.c b/hw/syborg_serial.c
deleted file mode 100644
index 6f339fa..0000000
--- a/hw/syborg_serial.c
+++ /dev/null
@@ -1,329 +0,0 @@
-/*
- * Syborg serial port
- *
- * Copyright (c) 2008 CodeSourcery
- *
- * 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 "sysbus.h"
-#include "qemu-char.h"
-#include "syborg.h"
-
-//#define DEBUG_SYBORG_SERIAL
-
-#ifdef DEBUG_SYBORG_SERIAL
-#define DPRINTF(fmt, ...) \
-do { printf("syborg_serial: " fmt , ##args); } while (0)
-#define BADF(fmt, ...) \
-do { fprintf(stderr, "syborg_serial: error: " fmt , ## __VA_ARGS__); \
- exit(1);} while (0)
-#else
-#define DPRINTF(fmt, ...) do {} while(0)
-#define BADF(fmt, ...) \
-do { fprintf(stderr, "syborg_serial: error: " fmt , ## __VA_ARGS__);} while (0)
-#endif
-
-enum {
- SERIAL_ID = 0,
- SERIAL_DATA = 1,
- SERIAL_FIFO_COUNT = 2,
- SERIAL_INT_ENABLE = 3,
- SERIAL_DMA_TX_ADDR = 4,
- SERIAL_DMA_TX_COUNT = 5, /* triggers dma */
- SERIAL_DMA_RX_ADDR = 6,
- SERIAL_DMA_RX_COUNT = 7, /* triggers dma */
- SERIAL_FIFO_SIZE = 8
-};
-
-#define SERIAL_INT_FIFO (1u << 0)
-#define SERIAL_INT_DMA_TX (1u << 1)
-#define SERIAL_INT_DMA_RX (1u << 2)
-
-typedef struct {
- SysBusDevice busdev;
- MemoryRegion iomem;
- uint32_t int_enable;
- uint32_t fifo_size;
- uint32_t *read_fifo;
- int read_pos;
- int read_count;
- CharDriverState *chr;
- qemu_irq irq;
- uint32_t dma_tx_ptr;
- uint32_t dma_rx_ptr;
- uint32_t dma_rx_size;
-} SyborgSerialState;
-
-static void syborg_serial_update(SyborgSerialState *s)
-{
- int level;
- level = 0;
- if ((s->int_enable & SERIAL_INT_FIFO) && s->read_count)
- level = 1;
- if (s->int_enable & SERIAL_INT_DMA_TX)
- level = 1;
- if ((s->int_enable & SERIAL_INT_DMA_RX) && s->dma_rx_size == 0)
- level = 1;
-
- qemu_set_irq(s->irq, level);
-}
-
-static uint32_t fifo_pop(SyborgSerialState *s)
-{
- const uint32_t c = s->read_fifo[s->read_pos];
- s->read_count--;
- s->read_pos++;
- if (s->read_pos == s->fifo_size)
- s->read_pos = 0;
-
- DPRINTF("FIFO pop %x (%d)\n", c, s->read_count);
- return c;
-}
-
-static void fifo_push(SyborgSerialState *s, uint32_t new_value)
-{
- int slot;
-
- DPRINTF("FIFO push %x (%d)\n", new_value, s->read_count);
- slot = s->read_pos + s->read_count;
- if (slot >= s->fifo_size)
- slot -= s->fifo_size;
- s->read_fifo[slot] = new_value;
- s->read_count++;
-}
-
-static void do_dma_tx(SyborgSerialState *s, uint32_t count)
-{
- unsigned char ch;
-
- if (count == 0)
- return;
-
- if (s->chr != NULL) {
- /* optimize later. Now, 1 byte per iteration */
- while (count--) {
- cpu_physical_memory_read(s->dma_tx_ptr, &ch, 1);
- qemu_chr_fe_write(s->chr, &ch, 1);
- s->dma_tx_ptr++;
- }
- } else {
- s->dma_tx_ptr += count;
- }
- /* QEMU char backends do not have a nonblocking mode, so we transmit all
- the data immediately and the interrupt status will be unchanged. */
-}
-
-/* Initiate RX DMA, and transfer data from the FIFO. */
-static void dma_rx_start(SyborgSerialState *s, uint32_t len)
-{
- uint32_t dest;
- unsigned char ch;
-
- dest = s->dma_rx_ptr;
- if (s->read_count < len) {
- s->dma_rx_size = len - s->read_count;
- len = s->read_count;
- } else {
- s->dma_rx_size = 0;
- }
-
- while (len--) {
- ch = fifo_pop(s);
- cpu_physical_memory_write(dest, &ch, 1);
- dest++;
- }
- s->dma_rx_ptr = dest;
- syborg_serial_update(s);
-}
-
-static uint64_t syborg_serial_read(void *opaque, target_phys_addr_t offset,
- unsigned size)
-{
- SyborgSerialState *s = (SyborgSerialState *)opaque;
- uint32_t c;
-
- offset &= 0xfff;
- DPRINTF("read 0x%x\n", (int)offset);
- switch(offset >> 2) {
- case SERIAL_ID:
- return SYBORG_ID_SERIAL;
- case SERIAL_DATA:
- if (s->read_count > 0)
- c = fifo_pop(s);
- else
- c = -1;
- syborg_serial_update(s);
- return c;
- case SERIAL_FIFO_COUNT:
- return s->read_count;
- case SERIAL_INT_ENABLE:
- return s->int_enable;
- case SERIAL_DMA_TX_ADDR:
- return s->dma_tx_ptr;
- case SERIAL_DMA_TX_COUNT:
- return 0;
- case SERIAL_DMA_RX_ADDR:
- return s->dma_rx_ptr;
- case SERIAL_DMA_RX_COUNT:
- return s->dma_rx_size;
- case SERIAL_FIFO_SIZE:
- return s->fifo_size;
-
- default:
- cpu_abort(cpu_single_env, "syborg_serial_read: Bad offset %x\n",
- (int)offset);
- return 0;
- }
-}
-
-static void syborg_serial_write(void *opaque, target_phys_addr_t offset,
- uint64_t value, unsigned size)
-{
- SyborgSerialState *s = (SyborgSerialState *)opaque;
- unsigned char ch;
-
- offset &= 0xfff;
- DPRINTF("Write 0x%x=0x%x\n", (int)offset, value);
- switch (offset >> 2) {
- case SERIAL_DATA:
- ch = value;
- if (s->chr)
- qemu_chr_fe_write(s->chr, &ch, 1);
- break;
- case SERIAL_INT_ENABLE:
- s->int_enable = value;
- syborg_serial_update(s);
- break;
- case SERIAL_DMA_TX_ADDR:
- s->dma_tx_ptr = value;
- break;
- case SERIAL_DMA_TX_COUNT:
- do_dma_tx(s, value);
- break;
- case SERIAL_DMA_RX_ADDR:
- /* For safety, writes to this register cancel any pending DMA. */
- s->dma_rx_size = 0;
- s->dma_rx_ptr = value;
- break;
- case SERIAL_DMA_RX_COUNT:
- dma_rx_start(s, value);
- break;
- default:
- cpu_abort(cpu_single_env, "syborg_serial_write: Bad offset %x\n",
- (int)offset);
- break;
- }
-}
-
-static int syborg_serial_can_receive(void *opaque)
-{
- SyborgSerialState *s = (SyborgSerialState *)opaque;
-
- if (s->dma_rx_size)
- return s->dma_rx_size;
- return s->fifo_size - s->read_count;
-}
-
-static void syborg_serial_receive(void *opaque, const uint8_t *buf, int size)
-{
- SyborgSerialState *s = (SyborgSerialState *)opaque;
-
- if (s->dma_rx_size) {
- /* Place it in the DMA buffer. */
- cpu_physical_memory_write(s->dma_rx_ptr, buf, size);
- s->dma_rx_size -= size;
- s->dma_rx_ptr += size;
- } else {
- while (size--)
- fifo_push(s, *buf);
- }
-
- syborg_serial_update(s);
-}
-
-static void syborg_serial_event(void *opaque, int event)
-{
- /* TODO: Report BREAK events? */
-}
-
-static const MemoryRegionOps syborg_serial_ops = {
- .read = syborg_serial_read,
- .write = syborg_serial_write,
- .endianness = DEVICE_NATIVE_ENDIAN,
-};
-
-static const VMStateDescription vmstate_syborg_serial = {
- .name = "syborg_serial",
- .version_id = 1,
- .minimum_version_id = 1,
- .minimum_version_id_old = 1,
- .fields = (VMStateField[]) {
- VMSTATE_UINT32_EQUAL(fifo_size, SyborgSerialState),
- VMSTATE_UINT32(int_enable, SyborgSerialState),
- VMSTATE_INT32(read_pos, SyborgSerialState),
- VMSTATE_INT32(read_count, SyborgSerialState),
- VMSTATE_UINT32(dma_tx_ptr, SyborgSerialState),
- VMSTATE_UINT32(dma_rx_ptr, SyborgSerialState),
- VMSTATE_UINT32(dma_rx_size, SyborgSerialState),
- VMSTATE_VARRAY_UINT32(read_fifo, SyborgSerialState, fifo_size, 1,
- vmstate_info_uint32, uint32),
- VMSTATE_END_OF_LIST()
- }
-};
-
-static int syborg_serial_init(SysBusDevice *dev)
-{
- SyborgSerialState *s = FROM_SYSBUS(SyborgSerialState, dev);
-
- sysbus_init_irq(dev, &s->irq);
- memory_region_init_io(&s->iomem, &syborg_serial_ops, s,
- "serial", 0x1000);
- sysbus_init_mmio(dev, &s->iomem);
- s->chr = qdev_init_chardev(&dev->qdev);
- if (s->chr) {
- qemu_chr_add_handlers(s->chr, syborg_serial_can_receive,
- syborg_serial_receive, syborg_serial_event, s);
- }
- if (s->fifo_size <= 0) {
- fprintf(stderr, "syborg_serial: fifo too small\n");
- s->fifo_size = 16;
- }
- s->read_fifo = g_malloc0(s->fifo_size * sizeof(s->read_fifo[0]));
-
- return 0;
-}
-
-static SysBusDeviceInfo syborg_serial_info = {
- .init = syborg_serial_init,
- .qdev.name = "syborg,serial",
- .qdev.size = sizeof(SyborgSerialState),
- .qdev.vmsd = &vmstate_syborg_serial,
- .qdev.props = (Property[]) {
- DEFINE_PROP_UINT32("fifo-size", SyborgSerialState, fifo_size, 16),
- DEFINE_PROP_END_OF_LIST(),
- }
-};
-
-static void syborg_serial_register_devices(void)
-{
- sysbus_register_withprop(&syborg_serial_info);
-}
-
-device_init(syborg_serial_register_devices)
generated by cgit v1.1 at 2024-09-16 22:24:15 +0000