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/qdev-properties.h"
  16 #include "hw/sysbus.h"
  17 #include "chardev/char-fe.h"
  18
  19 #define TYPE_CMSDK_APB_UART "cmsdk-apb-uart"
  20 #define CMSDK_APB_UART(obj) OBJECT_CHECK(CMSDKAPBUART, (obj), \
  21                                          TYPE_CMSDK_APB_UART)
  22
  23 typedef struct {
  24     /*< private >*/
  25     SysBusDevice parent_obj;
  26
  27     /*< public >*/
  28     MemoryRegion iomem;
  29     CharBackend chr;
  30     qemu_irq txint;
  31     qemu_irq rxint;
  32     qemu_irq txovrint;
  33     qemu_irq rxovrint;
  34     qemu_irq uartint;
  35     guint watch_tag;
  36     uint32_t pclk_frq;
  37
  38     uint32_t state;
  39     uint32_t ctrl;
  40     uint32_t intstatus;
  41     uint32_t bauddiv;
  42     /* This UART has no FIFO, only a 1-character buffer for each of Tx and Rx */
  43     uint8_t txbuf;
  44     uint8_t rxbuf;
  45 } CMSDKAPBUART;
  46
  47 /**
  48  * cmsdk_apb_uart_create - convenience function to create TYPE_CMSDK_APB_UART
  49  * @addr: location in system memory to map registers
  50  * @chr: Chardev backend to connect UART to, or NULL if no backend
  51  * @pclk_frq: frequency in Hz of the PCLK clock (used for calculating baud rate)
  52  */
  53 static inline DeviceState *cmsdk_apb_uart_create(hwaddr addr,
  54                                                  qemu_irq txint,
  55                                                  qemu_irq rxint,
  56                                                  qemu_irq txovrint,
  57                                                  qemu_irq rxovrint,
  58                                                  qemu_irq uartint,
  59                                                  Chardev *chr,
  60                                                  uint32_t pclk_frq)
  61 {
  62     DeviceState *dev;
  63     SysBusDevice *s;
  64
  65     dev = qdev_new(TYPE_CMSDK_APB_UART);
  66     s = SYS_BUS_DEVICE(dev);
  67     qdev_prop_set_chr(dev, "chardev", chr);
  68     qdev_prop_set_uint32(dev, "pclk-frq", pclk_frq);
  69     qdev_realize_and_unref(dev, NULL, &error_fatal);
  70     sysbus_mmio_map(s, 0, addr);
  71     sysbus_connect_irq(s, 0, txint);
  72     sysbus_connect_irq(s, 1, rxint);
  73     sysbus_connect_irq(s, 2, txovrint);
  74     sysbus_connect_irq(s, 3, rxovrint);
  75     sysbus_connect_irq(s, 4, uartint);
  76     return dev;
  77 }
  78
  79 #endif