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 80