461b5018d3
As not all drivers support interrupts we don't have a means to know if we can allow UART_INTERRUPT_DRIVEN to be enabled and thus various Kconfig options that select UART_INTERRUPT_DRIVEN. Some drivers have a interrupts, however not all do. So introduce a Kconfig option to let us know what the driver actually supports. Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
/*
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* Copyright (c) 2016 Jean-Paul Etienne <fractalclone@gmail.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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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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};
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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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