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 79