netarm: move serial driver to drivers/serial

add CONFIG_NETARM_SERIAL to activate the driver

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

1 files changed, 195 insertions, 0 deletions

diff --git a/drivers/serial/serial_netarm.c b/drivers/serial/serial_netarm.c
new file mode 100644
index 0000000..2eb5393
--- /dev/null
+++ b/drivers/serial/serial_netarm.c
@@ -0,0 +1,195 @@
+/*
+ * Serial Port stuff - taken from Linux
+ *
+ * (C) Copyright 2002
+ * MAZeT GmbH <www.mazet.de>
+ * Stephan Linz <linz@mazet.de>, <linz@li-pro.net>
+ *
+ * (c) 2004
+ * IMMS gGmbH <www.imms.de>
+ * Thomas Elste <info@elste.org>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * 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
+ *
+ */
+
+#include <common.h>
+#include <asm/hardware.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define PORTA	(*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTA))
+#if !defined(CONFIG_NETARM_NS7520)
+#define PORTB	(*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTB))
+#else
+#define PORTC	(*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTC))
+#endif
+
+/* wait until transmitter is ready for another character */
+#define TXWAITRDY(registers)							\
+{										\
+	ulong tmo = get_timer(0) + 1 * CONFIG_SYS_HZ;					\
+	while (((registers)->status_a & NETARM_SER_STATA_TX_RDY) == 0 )	{	\
+		if (get_timer(0) > tmo)						\
+			break;							\
+	}									\
+}
+
+
+#ifndef CONFIG_UART1_CONSOLE
+volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(0);
+volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(1);
+#else
+volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(1);
+volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(0);
+#endif
+
+extern void _netarm_led_FAIL1(void);
+
+/*
+ * Setup both serial i/f with given baudrate
+ */
+void serial_setbrg (void)
+{
+	/* set 0 ... make sure pins are configured for serial */
+#if !defined(CONFIG_NETARM_NS7520)
+	PORTA = PORTB =
+		NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
+#else
+	PORTA = NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
+	PORTC = NETARM_GEN_PORT_CSF (0xef) | NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
+#endif
+
+	/* first turn em off */
+	serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a = 0;
+
+	/* clear match register, we don't need it */
+	serial_reg_ch1->rx_match = serial_reg_ch2->rx_match = 0;
+
+	/* setup bit rate generator and rx buffer gap timer (1 byte only) */
+	if ((gd->baudrate >= MIN_BAUD_RATE)
+	    && (gd->baudrate <= MAX_BAUD_RATE)) {
+		serial_reg_ch1->bitrate = serial_reg_ch2->bitrate =
+			NETARM_SER_BR_X16 (gd->baudrate);
+		serial_reg_ch1->rx_buf_timer = serial_reg_ch2->rx_buf_timer =
+			0;
+		serial_reg_ch1->rx_char_timer = serial_reg_ch2->rx_char_timer =
+			NETARM_SER_RXGAP (gd->baudrate);
+	} else {
+		hang ();
+	}
+
+	/* setup port mode */
+	serial_reg_ch1->ctrl_b = serial_reg_ch2->ctrl_b =
+		( NETARM_SER_CTLB_RCGT_EN |
+		  NETARM_SER_CTLB_UART_MODE);
+	serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a =
+		( NETARM_SER_CTLA_ENABLE |
+		  NETARM_SER_CTLA_P_NONE |
+		  /* see errata */
+		  NETARM_SER_CTLA_2STOP |
+		  NETARM_SER_CTLA_8BITS |
+		  NETARM_SER_CTLA_DTR_EN |
+		  NETARM_SER_CTLA_RTS_EN);
+}
+
+
+/*
+ * Initialise the serial port with the given baudrate. The settings
+ * are always 8 data bits, no parity, 1 stop bit, no start bits.
+ */
+int serial_init (void)
+{
+	serial_setbrg ();
+	return 0;
+}
+
+
+/*
+ * Output a single byte to the serial port.
+ */
+void serial_putc (const char c)
+{
+	volatile unsigned char *fifo;
+
+	/* If \n, also do \r */
+	if (c == '\n')
+		serial_putc ('\r');
+
+	fifo = (volatile unsigned char *) &(serial_reg_ch1->fifo);
+	TXWAITRDY (serial_reg_ch1);
+	*fifo = c;
+}
+
+/*
+ * Test of a single byte from the serial port. Returns 1 on success, 0
+ * otherwise.
+ */
+int serial_tstc(void)
+{
+	return serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY;
+}
+
+/*
+ * Read a single byte from the serial port. Returns 1 on success, 0
+ * otherwise.
+ */
+int serial_getc (void)
+{
+	unsigned int ch_uint;
+	volatile unsigned int *fifo;
+	volatile unsigned char *fifo_char = NULL;
+	int buf_count = 0;
+
+	while (!(serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY))
+		/* NOP */ ;
+
+	fifo = (volatile unsigned int *) &(serial_reg_ch1->fifo);
+	fifo_char = (unsigned char *) &ch_uint;
+	ch_uint = *fifo;
+
+	buf_count = NETARM_SER_STATA_RXFDB (serial_reg_ch1->status_a);
+	switch (buf_count) {
+	case NETARM_SER_STATA_RXFDB_4BYTES:
+		buf_count = 4;
+		break;
+	case NETARM_SER_STATA_RXFDB_3BYTES:
+		buf_count = 3;
+		break;
+	case NETARM_SER_STATA_RXFDB_2BYTES:
+		buf_count = 2;
+		break;
+	case NETARM_SER_STATA_RXFDB_1BYTES:
+		buf_count = 1;
+		break;
+	default:
+		/* panic, be never here */
+		break;
+	}
+
+	serial_reg_ch1->status_a |= NETARM_SER_STATA_RX_CLOSED;
+
+	return ch_uint & 0xff;
+}
+
+void serial_puts (const char *s)
+{
+	while (*s) {
+		serial_putc (*s++);
+	}
+}