diff options
Diffstat (limited to 'qemu/hw/char/xilinx_uartlite.c')
| -rw-r--r-- | qemu/hw/char/xilinx_uartlite.c | 249 |
1 files changed, 0 insertions, 249 deletions
diff --git a/qemu/hw/char/xilinx_uartlite.c b/qemu/hw/char/xilinx_uartlite.c deleted file mode 100644 index 911af4a0d..000000000 --- a/qemu/hw/char/xilinx_uartlite.c +++ /dev/null @@ -1,249 +0,0 @@ -/* - * QEMU model of Xilinx uartlite. - * - * Copyright (c) 2009 Edgar E. Iglesias. - * - * 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 "qemu/osdep.h" -#include "hw/sysbus.h" -#include "sysemu/char.h" - -#define DUART(x) - -#define R_RX 0 -#define R_TX 1 -#define R_STATUS 2 -#define R_CTRL 3 -#define R_MAX 4 - -#define STATUS_RXVALID 0x01 -#define STATUS_RXFULL 0x02 -#define STATUS_TXEMPTY 0x04 -#define STATUS_TXFULL 0x08 -#define STATUS_IE 0x10 -#define STATUS_OVERRUN 0x20 -#define STATUS_FRAME 0x40 -#define STATUS_PARITY 0x80 - -#define CONTROL_RST_TX 0x01 -#define CONTROL_RST_RX 0x02 -#define CONTROL_IE 0x10 - -#define TYPE_XILINX_UARTLITE "xlnx.xps-uartlite" -#define XILINX_UARTLITE(obj) \ - OBJECT_CHECK(XilinxUARTLite, (obj), TYPE_XILINX_UARTLITE) - -typedef struct XilinxUARTLite { - SysBusDevice parent_obj; - - MemoryRegion mmio; - CharDriverState *chr; - qemu_irq irq; - - uint8_t rx_fifo[8]; - unsigned int rx_fifo_pos; - unsigned int rx_fifo_len; - - uint32_t regs[R_MAX]; -} XilinxUARTLite; - -static void uart_update_irq(XilinxUARTLite *s) -{ - unsigned int irq; - - if (s->rx_fifo_len) - s->regs[R_STATUS] |= STATUS_IE; - - irq = (s->regs[R_STATUS] & STATUS_IE) && (s->regs[R_CTRL] & CONTROL_IE); - qemu_set_irq(s->irq, irq); -} - -static void uart_update_status(XilinxUARTLite *s) -{ - uint32_t r; - - r = s->regs[R_STATUS]; - r &= ~7; - r |= 1 << 2; /* Tx fifo is always empty. We are fast :) */ - r |= (s->rx_fifo_len == sizeof (s->rx_fifo)) << 1; - r |= (!!s->rx_fifo_len); - s->regs[R_STATUS] = r; -} - -static void xilinx_uartlite_reset(DeviceState *dev) -{ - uart_update_status(XILINX_UARTLITE(dev)); -} - -static uint64_t -uart_read(void *opaque, hwaddr addr, unsigned int size) -{ - XilinxUARTLite *s = opaque; - uint32_t r = 0; - addr >>= 2; - switch (addr) - { - case R_RX: - r = s->rx_fifo[(s->rx_fifo_pos - s->rx_fifo_len) & 7]; - if (s->rx_fifo_len) - s->rx_fifo_len--; - uart_update_status(s); - uart_update_irq(s); - qemu_chr_accept_input(s->chr); - break; - - default: - if (addr < ARRAY_SIZE(s->regs)) - r = s->regs[addr]; - DUART(qemu_log("%s addr=%x v=%x\n", __func__, addr, r)); - break; - } - return r; -} - -static void -uart_write(void *opaque, hwaddr addr, - uint64_t val64, unsigned int size) -{ - XilinxUARTLite *s = opaque; - uint32_t value = val64; - unsigned char ch = value; - - addr >>= 2; - switch (addr) - { - case R_STATUS: - hw_error("write to UART STATUS?\n"); - break; - - case R_CTRL: - if (value & CONTROL_RST_RX) { - s->rx_fifo_pos = 0; - s->rx_fifo_len = 0; - } - s->regs[addr] = value; - break; - - case R_TX: - if (s->chr) - qemu_chr_fe_write(s->chr, &ch, 1); - - s->regs[addr] = value; - - /* hax. */ - s->regs[R_STATUS] |= STATUS_IE; - break; - - default: - DUART(printf("%s addr=%x v=%x\n", __func__, addr, value)); - if (addr < ARRAY_SIZE(s->regs)) - s->regs[addr] = value; - break; - } - uart_update_status(s); - uart_update_irq(s); -} - -static const MemoryRegionOps uart_ops = { - .read = uart_read, - .write = uart_write, - .endianness = DEVICE_NATIVE_ENDIAN, - .valid = { - .min_access_size = 1, - .max_access_size = 4 - } -}; - -static void uart_rx(void *opaque, const uint8_t *buf, int size) -{ - XilinxUARTLite *s = opaque; - - /* Got a byte. */ - if (s->rx_fifo_len >= 8) { - printf("WARNING: UART dropped char.\n"); - return; - } - s->rx_fifo[s->rx_fifo_pos] = *buf; - s->rx_fifo_pos++; - s->rx_fifo_pos &= 0x7; - s->rx_fifo_len++; - - uart_update_status(s); - uart_update_irq(s); -} - -static int uart_can_rx(void *opaque) -{ - XilinxUARTLite *s = opaque; - - return s->rx_fifo_len < sizeof(s->rx_fifo); -} - -static void uart_event(void *opaque, int event) -{ - -} - -static void xilinx_uartlite_realize(DeviceState *dev, Error **errp) -{ - XilinxUARTLite *s = XILINX_UARTLITE(dev); - - /* FIXME use a qdev chardev prop instead of qemu_char_get_next_serial() */ - s->chr = qemu_char_get_next_serial(); - if (s->chr) - qemu_chr_add_handlers(s->chr, uart_can_rx, uart_rx, uart_event, s); -} - -static void xilinx_uartlite_init(Object *obj) -{ - XilinxUARTLite *s = XILINX_UARTLITE(obj); - - sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq); - - memory_region_init_io(&s->mmio, obj, &uart_ops, s, - "xlnx.xps-uartlite", R_MAX * 4); - sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio); -} - -static void xilinx_uartlite_class_init(ObjectClass *klass, void *data) -{ - DeviceClass *dc = DEVICE_CLASS(klass); - - dc->reset = xilinx_uartlite_reset; - dc->realize = xilinx_uartlite_realize; - /* Reason: realize() method uses qemu_char_get_next_serial() */ - dc->cannot_instantiate_with_device_add_yet = true; -} - -static const TypeInfo xilinx_uartlite_info = { - .name = TYPE_XILINX_UARTLITE, - .parent = TYPE_SYS_BUS_DEVICE, - .instance_size = sizeof(XilinxUARTLite), - .instance_init = xilinx_uartlite_init, - .class_init = xilinx_uartlite_class_init, -}; - -static void xilinx_uart_register_types(void) -{ - type_register_static(&xilinx_uartlite_info); -} - -type_init(xilinx_uart_register_types) |