diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2017-07-17 13:36:08 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2017-07-17 13:36:08 +0100 |
| commit | 775df84e48bffba8cb188eecdf7872923d6e15d7 (patch) | |
| tree | bfe0ef148687ca5019d9ddc4b41e68388ea3581d /include | |
| parent | 2eb5578b4794d387e03cd424faa1f0e15c245ab9 (diff) | |
| download | qemu-775df84e48bffba8cb188eecdf7872923d6e15d7.zip | |
hw/char/cmsdk-apb-uart.c: Implement CMSDK APB UART
Implement a model of the simple "APB UART" provided in
the Cortex-M System Design Kit (CMSDK).
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1500029487-14822-3-git-send-email-peter.maydell@linaro.org
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/char/cmsdk-apb-uart.h | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/include/hw/char/cmsdk-apb-uart.h b/include/hw/char/cmsdk-apb-uart.h new file mode 100644 index 0000000000..c41fba9a27 --- /dev/null +++ b/include/hw/char/cmsdk-apb-uart.h @@ -0,0 +1,78 @@ +/* + * ARM CMSDK APB UART emulation + * + * Copyright (c) 2017 Linaro Limited + * Written by Peter Maydell + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 or + * (at your option) any later version. + */ + +#ifndef CMSDK_APB_UART_H +#define CMSDK_APB_UART_H + +#include "hw/sysbus.h" +#include "chardev/char-fe.h" + +#define TYPE_CMSDK_APB_UART "cmsdk-apb-uart" +#define CMSDK_APB_UART(obj) OBJECT_CHECK(CMSDKAPBUART, (obj), \ + TYPE_CMSDK_APB_UART) + +typedef struct { + /*< private >*/ + SysBusDevice parent_obj; + + /*< public >*/ + MemoryRegion iomem; + CharBackend chr; + qemu_irq txint; + qemu_irq rxint; + qemu_irq txovrint; + qemu_irq rxovrint; + qemu_irq uartint; + guint watch_tag; + uint32_t pclk_frq; + + uint32_t state; + uint32_t ctrl; + uint32_t intstatus; + uint32_t bauddiv; + /* This UART has no FIFO, only a 1-character buffer for each of Tx and Rx */ + uint8_t txbuf; + uint8_t rxbuf; +} CMSDKAPBUART; + +/** + * cmsdk_apb_uart_create - convenience function to create TYPE_CMSDK_APB_UART + * @addr: location in system memory to map registers + * @chr: Chardev backend to connect UART to, or NULL if no backend + * @pclk_frq: frequency in Hz of the PCLK clock (used for calculating baud rate) + */ +static inline DeviceState *cmsdk_apb_uart_create(hwaddr addr, + qemu_irq txint, + qemu_irq rxint, + qemu_irq txovrint, + qemu_irq rxovrint, + qemu_irq uartint, + Chardev *chr, + uint32_t pclk_frq) +{ + DeviceState *dev; + SysBusDevice *s; + + dev = qdev_create(NULL, TYPE_CMSDK_APB_UART); + s = SYS_BUS_DEVICE(dev); + qdev_prop_set_chr(dev, "chardev", chr); + qdev_prop_set_uint32(dev, "pclk-frq", pclk_frq); + qdev_init_nofail(dev); + sysbus_mmio_map(s, 0, addr); + sysbus_connect_irq(s, 0, txint); + sysbus_connect_irq(s, 1, rxint); + sysbus_connect_irq(s, 2, txovrint); + sysbus_connect_irq(s, 3, rxovrint); + sysbus_connect_irq(s, 4, uartint); + return dev; +} + +#endif |