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 #include "qom/object.h" 19 20 #define TYPE_CMSDK_APB_UART "cmsdk-apb-uart" 21 typedef struct CMSDKAPBUART CMSDKAPBUART; 22 DECLARE_INSTANCE_CHECKER(CMSDKAPBUART, CMSDK_APB_UART, 23 TYPE_CMSDK_APB_UART) 24 25 struct CMSDKAPBUART { 26 /*< private >*/ 27 SysBusDevice parent_obj; 28 29 /*< public >*/ 30 MemoryRegion iomem; 31 CharBackend chr; 32 qemu_irq txint; 33 qemu_irq rxint; 34 qemu_irq txovrint; 35 qemu_irq rxovrint; 36 qemu_irq uartint; 37 guint watch_tag; 38 uint32_t pclk_frq; 39 40 uint32_t state; 41 uint32_t ctrl; 42 uint32_t intstatus; 43 uint32_t bauddiv; 44 /* This UART has no FIFO, only a 1-character buffer for each of Tx and Rx */ 45 uint8_t txbuf; 46 uint8_t rxbuf; 47 }; 48 49 /** 50 * cmsdk_apb_uart_create - convenience function to create TYPE_CMSDK_APB_UART 51 * @addr: location in system memory to map registers 52 * @chr: Chardev backend to connect UART to, or NULL if no backend 53 * @pclk_frq: frequency in Hz of the PCLK clock (used for calculating baud rate) 54 */ 55 static inline DeviceState *cmsdk_apb_uart_create(hwaddr addr, 56 qemu_irq txint, 57 qemu_irq rxint, 58 qemu_irq txovrint, 59 qemu_irq rxovrint, 60 qemu_irq uartint, 61 Chardev *chr, 62 uint32_t pclk_frq) 63 { 64 DeviceState *dev; 65 SysBusDevice *s; 66 67 dev = qdev_new(TYPE_CMSDK_APB_UART); 68 s = SYS_BUS_DEVICE(dev); 69 qdev_prop_set_chr(dev, "chardev", chr); 70 qdev_prop_set_uint32(dev, "pclk-frq", pclk_frq); 71 sysbus_realize_and_unref(s, &error_fatal); 72 sysbus_mmio_map(s, 0, addr); 73 sysbus_connect_irq(s, 0, txint); 74 sysbus_connect_irq(s, 1, rxint); 75 sysbus_connect_irq(s, 2, txovrint); 76 sysbus_connect_irq(s, 3, rxovrint); 77 sysbus_connect_irq(s, 4, uartint); 78 return dev; 79 } 80 81 #endif 82