65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
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/*
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* Copyright (c) 2016 Jean-Paul Etienne <fractalclone@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <kernel.h>
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#include <arch/cpu.h>
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#include <uart.h>
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#include <sys_io.h>
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#define DEV_CFG(dev) \
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((const struct uart_device_config * const) \
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(dev)->config->config_info)
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static unsigned char uart_riscv_qemu_poll_out(struct device *dev,
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unsigned char c)
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{
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sys_write8(c, DEV_CFG(dev)->regs);
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return c;
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}
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static int uart_riscv_qemu_poll_in(struct device *dev, unsigned char *c)
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{
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*c = sys_read8(DEV_CFG(dev)->regs);
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return 0;
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}
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static int uart_riscv_qemu_init(struct device *dev)
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{
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/* Nothing to do */
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return 0;
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}
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static const struct uart_driver_api uart_riscv_qemu_driver_api = {
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.poll_in = uart_riscv_qemu_poll_in,
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.poll_out = uart_riscv_qemu_poll_out,
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.err_check = NULL,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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#error "Interrupt not available in uart riscv32-qemu"
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#endif
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};
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static const struct uart_device_config uart_riscv_qemu_dev_cfg_0 = {
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.regs = RISCV_QEMU_UART_BASE,
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};
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DEVICE_AND_API_INIT(uart_riscv_qemu_0, "uart0",
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uart_riscv_qemu_init, NULL,
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&uart_riscv_qemu_dev_cfg_0,
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PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
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(void *)&uart_riscv_qemu_driver_api);
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