include/hw/char/cmsdk-apb-uart.h

   1 /*
   2  * ARM CMSDK APB UART emulation
   3  *
   4  * Copyright (c) 2017 Linaro Limited
   5  * Written by Peter Maydell
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 or
   9  *  (at your option) any later version.
  10  */
  11
  12 #ifndef CMSDK_APB_UART_H
  13 #define CMSDK_APB_UART_H
  14
  15 #include "hw/sysbus.h"
  16 #include "chardev/char-fe.h"
  17
  18 #define TYPE_CMSDK_APB_UART "cmsdk-apb-uart"
  19 #define CMSDK_APB_UART(obj) OBJECT_CHECK(CMSDKAPBUART, (obj), \
  20                                          TYPE_CMSDK_APB_UART)
  21
  22 typedef struct {
  23     /*< private >*/
  24     SysBusDevice parent_obj;
  25
  26     /*< public >*/
  27     MemoryRegion iomem;
  28     CharBackend chr;
  29     qemu_irq txint;
  30     qemu_irq rxint;
  31     qemu_irq txovrint;
  32     qemu_irq rxovrint;
  33     qemu_irq uartint;
  34     guint watch_tag;
  35     uint32_t pclk_frq;
  36
  37     uint32_t state;
  38     uint32_t ctrl;
  39     uint32_t intstatus;
  40     uint32_t bauddiv;
  41     /* This UART has no FIFO, only a 1-character buffer for each of Tx and Rx */
  42     uint8_t txbuf;
  43     uint8_t rxbuf;
  44 } CMSDKAPBUART;
  45
  46 /**
  47  * cmsdk_apb_uart_create - convenience function to create TYPE_CMSDK_APB_UART
  48  * @addr: location in system memory to map registers
  49  * @chr: Chardev backend to connect UART to, or NULL if no backend
  50  * @pclk_frq: frequency in Hz of the PCLK clock (used for calculating baud rate)
  51  */
  52 static inline DeviceState *cmsdk_apb_uart_create(hwaddr addr,
  53                                                  qemu_irq txint,
  54                                                  qemu_irq rxint,
  55                                                  qemu_irq txovrint,
  56                                                  qemu_irq rxovrint,
  57                                                  qemu_irq uartint,
  58                                                  Chardev *chr,
  59                                                  uint32_t pclk_frq)
  60 {
  61     DeviceState *dev;
  62     SysBusDevice *s;
  63
  64     dev = qdev_create(NULL, TYPE_CMSDK_APB_UART);
  65     s = SYS_BUS_DEVICE(dev);
  66     qdev_prop_set_chr(dev, "chardev", chr);
  67     qdev_prop_set_uint32(dev, "pclk-frq", pclk_frq);
  68     qdev_init_nofail(dev);
  69     sysbus_mmio_map(s, 0, addr);
  70     sysbus_connect_irq(s, 0, txint);
  71     sysbus_connect_irq(s, 1, rxint);
  72     sysbus_connect_irq(s, 2, txovrint);
  73     sysbus_connect_irq(s, 3, rxovrint);
  74     sysbus_connect_irq(s, 4, uartint);
  75     return dev;
  76 }
  77
  78 #endif