X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=drivers%2Fserial%2Fopencores_yanu.c;h=f68c8d0f0436a3ee1dce54460d799501685bb05d;hb=88342103cccf73b39c764bfb1473e7bf29b52b88;hp=f18f7f444e119b5692759ce06c9e7ed1b38f581f;hpb=a233631095eba3e853049f6656642e3a7ef1d73c;p=u-boot

diff --git a/drivers/serial/opencores_yanu.c b/drivers/serial/opencores_yanu.c
index f18f7f444e..f68c8d0f04 100644
--- a/drivers/serial/opencores_yanu.c
+++ b/drivers/serial/opencores_yanu.c
@@ -1,29 +1,17 @@
 /*
- * Copyright 2010, Renato Andreola <renato.andreola@imagos.it>
- *
- * See file CREDITS for list of people who contributed to this
- * project.
+ * Altera NiosII YANU serial interface by Imagos
+ * please see  http://www.opencores.org/project,yanu for
+ * information/downloads
  *
- * 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 2 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.
+ * Copyright 2010, Renato Andreola <renato.andreola@imagos.it>
  *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
 #include <watchdog.h>
 #include <asm/io.h>
-#include <nios2-yanu.h>
+#include <serial.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -31,64 +19,118 @@ DECLARE_GLOBAL_DATA_PTR;
 /* YANU Imagos serial port */
 /*-----------------------------------------------------------------*/
 
-static yanu_uart_t *uart = (yanu_uart_t *)CONFIG_SYS_NIOS_CONSOLE;
-
-#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
+#define YANU_MAX_PRESCALER_N   ((1 << 4) - 1)	/* 15 */
+#define YANU_MAX_PRESCALER_M   ((1 << 11) -1)	/* 2047 */
+#define YANU_FIFO_SIZE         (16)
+#define YANU_RXFIFO_SIZE       (YANU_FIFO_SIZE)
+#define YANU_TXFIFO_SIZE       (YANU_FIFO_SIZE)
+
+#define YANU_RXFIFO_DLY        (10*11)
+#define YANU_TXFIFO_THR        (10)
+#define YANU_DATA_CHAR_MASK    (0xFF)
+
+/* data register */
+#define YANU_DATA_OFFSET       (0)	/* data register offset */
+
+#define YANU_CONTROL_OFFSET    (4)	/* control register offset */
+/* interrupt enable */
+#define YANU_CONTROL_IE_RRDY   (1<<0)	/* ie on received character ready */
+#define YANU_CONTROL_IE_OE     (1<<1)	/* ie on rx overrun    */
+#define YANU_CONTROL_IE_BRK    (1<<2)	/* ie on break detect  */
+#define YANU_CONTROL_IE_FE     (1<<3)	/* ie on framing error */
+#define YANU_CONTROL_IE_PE     (1<<4)	/* ie on parity error  */
+#define YANU_CONTROL_IE_TRDY   (1<<5)	/* ie interrupt on tranmitter ready */
+/* control bits */
+#define YANU_CONTROL_BITS_POS  (6)	/* bits number pos */
+#define YANU_CONTROL_BITS      (1<<YANU_CONTROL_BITS_POS)	/* number of rx/tx bits per word. 3 bit unsigned integer */
+#define YANU_CONTROL_BITS_N    (3)	/* ... its bit filed length */
+#define YANU_CONTROL_PARENA    (1<<9)	/*  enable parity bit transmission/reception */
+#define YANU_CONTROL_PAREVEN   (1<<10)	/* parity even */
+#define YANU_CONTROL_STOPS     (1<<11)	/* number of stop bits */
+#define YANU_CONTROL_HHENA     (1<<12)	/* Harware Handshake enable... */
+#define YANU_CONTROL_FORCEBRK  (1<<13)	/* if set than txd = active (0) */
+/* tuning part */
+#define YANU_CONTROL_RDYDLY    (1<<14)	/* delay from "first" before setting rrdy (in bit) */
+#define YANU_CONTROL_RDYDLY_N  (8)	/* ... its bit filed length */
+#define YANU_CONTROL_TXTHR     (1<<22)	/* tx interrupt threshold: the trdy set if txfifo_chars<= txthr (chars) */
+#define YANU_CONTROL_TXTHR_N   (4)	/* ... its bit field length */
+
+#define YANU_BAUD_OFFSET  (8)	/* baud register offset */
+#define YANU_BAUDM        (1<<0)	/* baud mantissa lsb */
+#define YANU_BAUDM_N      (12)	/* ...its bit filed length */
+#define YANU_BAUDE        (1<<12)	/* baud exponent lsb */
+#define YANU_BAUDE_N      (4)	/* ...its bit field length */
+
+#define YANU_ACTION_OFFSET   (12)	/* action register... write only */
+#define YANU_ACTION_RRRDY    (1<<0)	/* reset rrdy */
+#define YANU_ACTION_ROE      (1<<1)	/* reset oe */
+#define YANU_ACTION_RBRK     (1<<2)	/* reset brk */
+#define YANU_ACTION_RFE      (1<<3)	/* reset fe  */
+#define YANU_ACTION_RPE      (1<<4)	/* reset pe  */
+#define YANU_ACTION_SRRDY    (1<<5)	/* set rrdy  */
+#define YANU_ACTION_SOE      (1<<6)	/* set oe    */
+#define YANU_ACTION_SBRK     (1<<7)	/* set brk   */
+#define YANU_ACTION_SFE      (1<<8)	/* set fe    */
+#define YANU_ACTION_SPE      (1<<9)	/* set pe    */
+#define YANU_ACTION_RFIFO_PULL  (1<<10)	/* pull a char from rx fifo we MUST do it before taking a char */
+#define YANU_ACTION_RFIFO_CLEAR (1<<11)	/* clear rx fifo */
+#define YANU_ACTION_TFIFO_CLEAR (1<<12)	/* clear tx fifo */
+#define YANU_ACTION_RTRDY       (1<<13)	/* clear trdy    */
+#define YANU_ACTION_STRDY       (1<<14)	/* set trdy      */
+
+#define YANU_STATUS_OFFSET   (16)
+#define YANU_STATUS_RRDY     (1<<0)	/* rxrdy flag */
+#define YANU_STATUS_TRDY     (1<<1)	/* txrdy flag */
+#define YANU_STATUS_OE       (1<<2)	/* rx overrun error */
+#define YANU_STATUS_BRK      (1<<3)	/* rx break detect flag */
+#define YANU_STATUS_FE       (1<<4)	/* rx framing error flag */
+#define YANU_STATUS_PE       (1<<5)	/* rx parity erro flag */
+#define YANU_RFIFO_CHARS_POS (6)
+#define YANU_RFIFO_CHARS     (1<<RFIFO_CHAR_POS)	/* number of chars into rx fifo */
+#define YANU_RFIFO_CHARS_N   (5)	/* ...its bit field length: 32 chars */
+#define YANU_TFIFO_CHARS_POS (11)
+#define YANU_TFIFO_CHARS     (1<<TFIFO_CHAR_POS)	/* number of chars into tx fifo */
+#define YANU_TFIFO_CHARS_N   (5)	/* ...its bit field length: 32 chars */
+
+typedef volatile struct {
+	volatile unsigned data;
+	volatile unsigned control;	/* control register (RW) 32-bit   */
+	volatile unsigned baud;	/* baud/prescaler register (RW) 32-bit */
+	volatile unsigned action;	/* action register (W) 32-bit */
+	volatile unsigned status;	/* status register (R) 32-bit */
+	volatile unsigned magic;	/* magic register (R) 32-bit */
+} yanu_uart_t;
 
-/* Everything's already setup for fixed-baud PTF assignment*/
+static yanu_uart_t *uart = (yanu_uart_t *)CONFIG_SYS_NIOS_CONSOLE;
 
-void serial_setbrg (void)
+static void oc_serial_setbrg(void)
 {
 	int n, k;
 	const unsigned max_uns = 0xFFFFFFFF;
 	unsigned best_n, best_m, baud;
+	unsigned baudrate;
 
-	/* compute best N and M couple */
-	best_n = YANU_MAX_PRESCALER_N;
-	for (n = YANU_MAX_PRESCALER_N; n >= 0; n--) {
-		if ((unsigned)CONFIG_SYS_CLK_FREQ / (1 << (n + 4)) >=
-		    (unsigned)CONFIG_BAUDRATE) {
-			best_n = n;
-			break;
-		}
-	}
-	for (k = 0;; k++) {
-		if ((unsigned)CONFIG_BAUDRATE <= (max_uns >> (15+n-k)))
-			break;
-	}
-	best_m =
-	    ((unsigned)CONFIG_BAUDRATE * (1 << (15 + n - k))) /
-	    ((unsigned)CONFIG_SYS_CLK_FREQ >> k);
-
-	baud = best_m + best_n * YANU_BAUDE;
-	writel(baud, &uart->baud);
-
-	return;
-}
-
+#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
+	/* Everything's already setup for fixed-baud PTF assignment */
+	baudrate = CONFIG_BAUDRATE;
 #else
-
-void serial_setbrg (void)
-{	
-	int n, k;
-	const unsigned max_uns = 0xFFFFFFFF;
-	unsigned best_n, best_m, baud;
-
+	baudrate = gd->baudrate;
+#endif
 	/* compute best N and M couple */
 	best_n = YANU_MAX_PRESCALER_N;
 	for (n = YANU_MAX_PRESCALER_N; n >= 0; n--) {
 		if ((unsigned)CONFIG_SYS_CLK_FREQ / (1 << (n + 4)) >=
-		    gd->baudrate) {
+		    baudrate) {
 			best_n = n;
 			break;
 		}
 	}
 	for (k = 0;; k++) {
-		if (gd->baudrate <= (max_uns >> (15+n-k)))
+		if (baudrate <= (max_uns >> (15+n-k)))
 			break;
 	}
 	best_m =
-	    (gd->baudrate * (1 << (15 + n - k))) /
+	    (baudrate * (1 << (15 + n - k))) /
 	    ((unsigned)CONFIG_SYS_CLK_FREQ >> k);
 
 	baud = best_m + best_n * YANU_BAUDE;
@@ -97,10 +139,7 @@ void serial_setbrg (void)
 	return;
 }
 
-
-#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
-
-int serial_init (void)
+static int oc_serial_init(void)
 {
 	unsigned action,control;
 
@@ -114,12 +153,14 @@ int serial_init (void)
 	    YANU_ACTION_RFE | YANU_ACTION_RFIFO_CLEAR | YANU_ACTION_TFIFO_CLEAR;
 
 	writel(action, &uart->action);
-	
-	/*  control register cleanup */
-	/* no interrupts enabled */
-	/* one stop bit */
-	/* hardware flow control disabled */
-	/* 8 bits */
+
+	/*
+	 * control register cleanup
+	 * no interrupts enabled
+	 * one stop bit
+	 * hardware flow control disabled
+	 * 8 bits
+	 */
 	control = (0x7 << YANU_CONTROL_BITS_POS);
 	/* enven parity just to be clean */
 	control |= YANU_CONTROL_PAREVEN;
@@ -139,14 +180,14 @@ int serial_init (void)
 /*-----------------------------------------------------------------------
  * YANU CONSOLE
  *---------------------------------------------------------------------*/
-void serial_putc (char c)
+static void oc_serial_putc(char c)
 {
 	int tx_chars;
 	unsigned status;
 
 	if (c == '\n')
 		serial_putc ('\r');
-	
+
 	while (1) {
 		status = readl(&uart->status);
 		tx_chars = (status>>YANU_TFIFO_CHARS_POS)
@@ -159,30 +200,43 @@ void serial_putc (char c)
 	writel((unsigned char)c, &uart->data);
 }
 
-void serial_puts (const char *s)
-{
-	while (*s != 0) {
-		serial_putc (*s++);
-	}
-}
-
-
-int serial_tstc(void)
+static int oc_serial_tstc(void)
 {
 	unsigned status ;
 
 	status = readl(&uart->status);
 	return (((status >> YANU_RFIFO_CHARS_POS) &
 		 ((1 << YANU_RFIFO_CHARS_N) - 1)) > 0);
-}	
+}
 
-int serial_getc (void)
+static int oc_serial_getc(void)
 {
 	while (serial_tstc() == 0)
 		WATCHDOG_RESET ();
-	
+
 	/* first we pull the char */
 	writel(YANU_ACTION_RFIFO_PULL, &uart->action);
 
 	return(readl(&uart->data) & YANU_DATA_CHAR_MASK);
 }
+
+static struct serial_device oc_serial_drv = {
+	.name	= "oc_serial",
+	.start	= oc_serial_init,
+	.stop	= NULL,
+	.setbrg	= oc_serial_setbrg,
+	.putc	= oc_serial_putc,
+	.puts	= default_serial_puts,
+	.getc	= oc_serial_getc,
+	.tstc	= oc_serial_tstc,
+};
+
+void oc_serial_initialize(void)
+{
+	serial_register(&oc_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &oc_serial_drv;
+}