445f3e4ee7
Mostly driver code in various platforms. There are still some warnings in this part of the tree in lesser-used platforms.
97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
/*
|
|
* Copyright (c) 2015 Travis Geiselbrecht
|
|
*
|
|
* Use of this source code is governed by a MIT-style
|
|
* license that can be found in the LICENSE file or at
|
|
* https://opensource.org/licenses/MIT
|
|
*/
|
|
#include <lk/reg.h>
|
|
#include <lk/trace.h>
|
|
#include <lib/cbuf.h>
|
|
#include <lk/init.h>
|
|
#include <kernel/thread.h>
|
|
#include <platform.h>
|
|
#include <platform/interrupts.h>
|
|
#include <sys/types.h>
|
|
#include <target/microblaze-config.h>
|
|
|
|
#include "uartlite.h"
|
|
|
|
#define LOCAL_TRACE 0
|
|
|
|
#define R_RX 0
|
|
#define R_TX 1
|
|
#define R_STATUS 2
|
|
#define R_CTRL 3
|
|
#define R_MAX 4
|
|
|
|
#define STATUS_RXVALID 0x01
|
|
#define STATUS_RXFULL 0x02
|
|
#define STATUS_TXEMPTY 0x04
|
|
#define STATUS_TXFULL 0x08
|
|
#define STATUS_IE 0x10
|
|
#define STATUS_OVERRUN 0x20
|
|
#define STATUS_FRAME 0x40
|
|
#define STATUS_PARITY 0x80
|
|
|
|
#define CONTROL_RST_TX 0x01
|
|
#define CONTROL_RST_RX 0x02
|
|
#define CONTROL_IE 0x10
|
|
|
|
#define UART_REG(reg) (*REG32(UARTLITE_BASEADDR + (reg) * 4))
|
|
|
|
#define RXBUF_SIZE 128
|
|
static cbuf_t uart_rx_buf;
|
|
|
|
void uartlite_putc(char c) {
|
|
while (UART_REG(R_STATUS) & STATUS_TXFULL)
|
|
;
|
|
UART_REG(R_TX) = c;
|
|
}
|
|
|
|
int uartlite_getc(bool wait) {
|
|
#if 0
|
|
char c;
|
|
if (cbuf_read_char(&uart_rx_buf, &c, wait) == 1)
|
|
return c;
|
|
#else
|
|
do {
|
|
if (UART_REG(R_STATUS) & STATUS_RXVALID) {
|
|
char c = UART_REG(R_RX);
|
|
return c;
|
|
}
|
|
} while (wait);
|
|
#endif
|
|
|
|
return -1;
|
|
}
|
|
|
|
static enum handler_return uartlite_irq(void *arg) {
|
|
bool resched = false;
|
|
|
|
/* while receive fifo not empty, read a char */
|
|
while (UART_REG(R_STATUS) & STATUS_RXVALID) {
|
|
char c = UART_REG(R_RX);
|
|
cbuf_write_char(&uart_rx_buf, c, false);
|
|
|
|
resched = true;
|
|
}
|
|
|
|
return resched ? INT_RESCHEDULE : INT_NO_RESCHEDULE;
|
|
}
|
|
|
|
static void uartlite_init(uint level) {
|
|
TRACE;
|
|
|
|
//UART_REG(R_CTRL) = CONTROL_RST_TX | CONTROL_RST_RX;
|
|
// UART_REG(R_CTRL) |= CONTROL_IE;
|
|
|
|
cbuf_initialize(&uart_rx_buf, RXBUF_SIZE);
|
|
|
|
// register_int_handler(UARTLITE_IRQ, uartlite_irq, NULL);
|
|
// unmask_interrupt(UARTLITE_IRQ);
|
|
}
|
|
|
|
LK_INIT_HOOK(uartlite, uartlite_init, LK_INIT_LEVEL_PLATFORM);
|
|
|