LXR qemu/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
  22typedef 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 */
  52static 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
  79