diff options
Diffstat (limited to 'hw/syborg_serial.c')
| -rw-r--r-- | hw/syborg_serial.c | 329 |
1 files changed, 0 insertions, 329 deletions
diff --git a/hw/syborg_serial.c b/hw/syborg_serial.c deleted file mode 100644 index 6f339fa7a6..0000000000 --- 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) |