hw/clock: Only propagate clock changes if the clock is changed
[qemu.git] / include / hw / char / cadence_uart.h
1 /*
2 * Device model for Cadence UART
3 *
4 * Copyright (c) 2010 Xilinx Inc.
5 * Copyright (c) 2012 Peter A.G. Crosthwaite (peter.crosthwaite@petalogix.com)
6 * Copyright (c) 2012 PetaLogix Pty Ltd.
7 * Written by Haibing Ma
8 * M.Habib
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #ifndef CADENCE_UART_H
20 #define CADENCE_UART_H
21
22 #include "hw/qdev-properties.h"
23 #include "hw/sysbus.h"
24 #include "chardev/char-fe.h"
25 #include "qapi/error.h"
26 #include "qemu/timer.h"
27
28 #define CADENCE_UART_RX_FIFO_SIZE 16
29 #define CADENCE_UART_TX_FIFO_SIZE 16
30
31 #define CADENCE_UART_R_MAX (0x48/4)
32
33 #define TYPE_CADENCE_UART "cadence_uart"
34 #define CADENCE_UART(obj) OBJECT_CHECK(CadenceUARTState, (obj), \
35 TYPE_CADENCE_UART)
36
37 typedef struct {
38 /*< private >*/
39 SysBusDevice parent_obj;
40
41 /*< public >*/
42 MemoryRegion iomem;
43 uint32_t r[CADENCE_UART_R_MAX];
44 uint8_t rx_fifo[CADENCE_UART_RX_FIFO_SIZE];
45 uint8_t tx_fifo[CADENCE_UART_TX_FIFO_SIZE];
46 uint32_t rx_wpos;
47 uint32_t rx_count;
48 uint32_t tx_count;
49 uint64_t char_tx_time;
50 CharBackend chr;
51 qemu_irq irq;
52 QEMUTimer *fifo_trigger_handle;
53 Clock *refclk;
54 } CadenceUARTState;
55
56 static inline DeviceState *cadence_uart_create(hwaddr addr,
57 qemu_irq irq,
58 Chardev *chr)
59 {
60 DeviceState *dev;
61 SysBusDevice *s;
62
63 dev = qdev_new(TYPE_CADENCE_UART);
64 s = SYS_BUS_DEVICE(dev);
65 qdev_prop_set_chr(dev, "chardev", chr);
66 sysbus_realize_and_unref(s, &error_fatal);
67 sysbus_mmio_map(s, 0, addr);
68 sysbus_connect_irq(s, 0, irq);
69
70 return dev;
71 }
72
73 #endif