move uart implementation out of subdirectory

1 files changed, 0 insertions, 238 deletions

diff --git a/uart/uart.c b/uart/uart.c
deleted file mode 100644
index 3ead880..0000000
--- a/uart/uart.c
+++ /dev/null
@@ -1,238 +0,0 @@
-/*
- * uart/uart.c -- hardware UART interface
- *
- * Copyright (C) 2016-2017 Tomasz Kramkowski <tk@the-tk.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include <asm.h>
-#include <cm4.h>
-#include <reg/gpio.h>
-#include <reg/port.h>
-#include <reg/sim.h>
-#include <reg/uart.h>
-#include <stdarg.h>
-#include <stddef.h>
-
-#include "uart.h"
-
-enum {
-	SBR_VAL = 39,
-	BRFA_VAL = 2,
-	SRBSZ = 2048,
-	FIFOSZ = 8,
-};
-
-static struct {
-	unsigned char buf[SRBSZ];
-	int start, end;
-} send_rb = { .start = 0, .end = 0 };
-
-static inline size_t rb_store(void *_data, size_t size)
-{
-	unsigned char *data = _data;
-	size_t avail;
-	int start, end;
-
-	start = send_rb.start;
-	end = send_rb.end;
-	avail = (start + sizeof send_rb.buf - end) % sizeof send_rb.buf - 1;
-
-	if (size > avail) {
-		GPIOC_PSOR = BV(5);
-		size = avail;
-	}
-
-	for (size_t i = 0; i < size; i++)
-		send_rb.buf[(end + i) % sizeof send_rb.buf] = data[i];
-	send_rb.end = (end + size) % sizeof send_rb.buf;
-
-	/* Enable Transmission Interrupt */
-	CLI();
-	SET_BIT(UART0_C2, C2_TIE);
-	STI();
-
-	return size;
-}
-
-void uart_setup(void)
-{
-	/* Clock gating for UART0 */
-	SET_BIT(SIM_SCGC4, SCGC4_UART0);
-	/* Disable TX and RX */
-	SET_MASKED(UART0_C2, BV(C2_TE) | BV(C2_RE), 0);
-	/* Default settings */
-	UART0_C1 = 0;
-	/* SBR and BRFA for baud rate */
-	SET_MASKED(UART0_BDH, BDH_SBR_M, ((SBR_VAL & 0x1f00) >> 8) << BDH_SBR);
-	SET_MASKED(UART0_BDL, BDL_SBR_M, (SBR_VAL & 0xff) << BDL_SBR);
-	SET_MASKED(UART0_C4, C4_BRFA_M, BRFA_VAL << C4_BRFA);
-	/* flush and enable TX FIFO */
-	UART0_CFIFO |= BV(CFIFO_TXFLUSH);
-	UART0_PFIFO |= BV(PFIFO_TXFE);
-	/* set watermark at 1 entry */
-	SET_MASKED(UART0_TWFIFO, TWFIFO_TXWATER_M, 1 << TWFIFO_TXWATER);
-	/* NVIC enable interrupt */
-	ISR_CLRPEND(45);
-	INTPRI(45) = 0xf0;
-	ISR_SETENA(45);
-	/* enable correct ALT MUX on TX pin */
-	PORTB_PCR(17) = 3 << PCR_MUX;
-	/* enable TX */
-	SET_MASKED(UART0_C2, BV(C2_TE), BV(C2_TE));
-}
-
-void uart_putchar(int c)
-{
-	static unsigned char buf[128];
-	static size_t size = 0;
-
-	if (c == '\n')
-		uart_putchar('\r');
-
-	buf[size++] = c;
-
-	if (size >= sizeof buf || c == '\n') {
-		rb_store(buf, size);
-		size = 0;
-	}
-}
-
-void uart_puts(const char *s)
-{
-	for (size_t i = 0; s[i]; i++)
-		uart_putchar(s[i]);
-	uart_putchar('\n');
-}
-
-static inline void putul(unsigned long n, int base)
-{
-	static const char *digits = "0123456789abcdef";
-	int i;
-	char tmp[64];
-
-	if (base < 2 || base > 16)
-		return;
-
-	if (n == 0) {
-		uart_putchar('0');
-		return;
-	}
-	for (i = 0; n; i++) {
-		int res = n % base;
-		n = n / base;
-		tmp[i] = digits[res];
-	}
-
-	for (i -= 1; i >= 0; i--)
-		uart_putchar(tmp[i]);
-}
-
-static inline void putl(long n)
-{
-	int i;
-	char tmp[64];
-
-	if (n < 0) {
-		uart_putchar('-');
-		n *= -1;
-	}
-
-	if (n == 0) {
-		uart_putchar('0');
-		return;
-	}
-
-	for (i = 0; n; i++) {
-		int res = n % 10;
-		n = n / 10;
-		tmp[i] = '0' + res;
-	}
-
-	for (i -= 1; i >= 0; i--)
-		uart_putchar(tmp[i]);
-}
-
-void uart_printf(const char *fmt, ...)
-{
-	va_list ap;
-	const char *p;
-	int ival;
-	unsigned uival;
-	long lival;
-	unsigned long ulival;
-
-	va_start(ap, fmt);
-	for (p = fmt; *p; p++) {
-		if (*p != '%') {
-			uart_putchar(*p);
-			continue;
-		}
-		switch (*++p) {
-		case 'd': case 'i':
-			ival = va_arg(ap, int);
-			putl(ival);
-			break;
-		case 'o': case 'u': case 'x':
-			uival = va_arg(ap, unsigned);
-			switch (*p) {
-			case 'o': putul(uival, 8); break;
-			case 'u': putul(uival, 10); break;
-			case 'x': putul(uival, 16); break;
-			}
-			break;
-		case 'l':
-			switch (*++p) {
-			case 'd': case 'i':
-				lival = va_arg(ap, long);
-				putl(lival);
-				break;
-			case 'o': case 'u': case 'x':
-				ulival = va_arg(ap, unsigned long);
-				switch (*p) {
-				case 'o': putul(ulival, 8); break;
-				case 'u': putul(ulival, 10); break;
-				case 'x': putul(ulival, 16); break;
-				}
-				break;
-			}
-		}
-	}
-	va_end(ap);
-}
-
-void uart0_isr(void)
-{
-	int avail, start, end, tosend;
-
-	if (!GET_BIT(UART0_S1, S1_TDRE))
-		return;
-
-	avail = FIFOSZ - UART0_TCFIFO;
-	CLI();
-	start = send_rb.start;
-	end = send_rb.end;
-	tosend = (end + sizeof send_rb.buf - start) % sizeof send_rb.buf;
-	if (tosend == 0)
-		UNSET_BIT(UART0_C2, C2_TIE);
-	STI();
-
-	if (tosend > avail)
-		tosend = avail;
-
-	for (int i = 0; i < tosend; i++)
-		UART0_D = send_rb.buf[(start + i) % sizeof send_rb.buf];
-
-	send_rb.start = (start + tosend) % sizeof send_rb.buf;
-}