102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
/*
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* Copyright (c) 2015 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <reg.h>
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#include <trace.h>
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#include <lib/cbuf.h>
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#include <lk/init.h>
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#include <kernel/thread.h>
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#include <platform.h>
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#include <platform/interrupts.h>
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#include <sys/types.h>
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#include <target/qemu-microblaze.h>
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#define LOCAL_TRACE 0
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#define R_RX 0
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#define R_TX 1
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#define R_STATUS 2
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#define R_CTRL 3
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#define R_MAX 4
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#define STATUS_RXVALID 0x01
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#define STATUS_RXFULL 0x02
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#define STATUS_TXEMPTY 0x04
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#define STATUS_TXFULL 0x08
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#define STATUS_IE 0x10
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#define STATUS_OVERRUN 0x20
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#define STATUS_FRAME 0x40
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#define STATUS_PARITY 0x80
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#define CONTROL_RST_TX 0x01
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#define CONTROL_RST_RX 0x02
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#define CONTROL_IE 0x10
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#define UART_REG(reg) (*REG32(UARTLITE_BASEADDR + (reg) * 4))
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#define RXBUF_SIZE 128
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static cbuf_t uart_rx_buf;
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void uartlite_putc(char c)
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{
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UART_REG(R_TX) = c;
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}
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int uartlite_getc(bool wait)
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{
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char c;
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if (cbuf_read_char(&uart_rx_buf, &c, wait) == 1)
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return c;
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return -1;
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}
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enum handler_return uartlite_irq(void *arg)
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{
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bool resched = false;
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/* while receive fifo not empty, read a char */
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while (UART_REG(R_STATUS) & STATUS_RXVALID) {
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char c = UART_REG(R_RX);
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cbuf_write_char(&uart_rx_buf, c, false);
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resched = true;
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}
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return resched ? INT_RESCHEDULE : INT_NO_RESCHEDULE;
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}
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static void uartlite_init(uint level)
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{
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TRACE;
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UART_REG(R_CTRL) |= CONTROL_IE;
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cbuf_initialize(&uart_rx_buf, RXBUF_SIZE);
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register_int_handler(UARTLITE_IRQ, uartlite_irq, NULL);
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unmask_interrupt(UARTLITE_IRQ);
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}
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LK_INIT_HOOK(uartlite, uartlite_init, LK_INIT_LEVEL_PLATFORM);
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