[U-Boot] [PATCH 2/3] add serial driver for pollux CPU

[Brian Cavagnolo]

Signed-off-by: Brian Cavagnolo <brian at cozybit.com>
Signed-off-by: Andrey Yurovsky <yurovsky at gmail.com>
---
 drivers/serial/Makefile        |    1 +
 drivers/serial/serial_pollux.c |  116 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 117 insertions(+), 0 deletions(-)
 create mode 100644 drivers/serial/serial_pollux.c

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index c731bfb..87efd15 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -56,6 +56,7 @@ COBJS-$(CONFIG_S3C44B0_SERIAL) += serial_s3c44b0.o
 COBJS-$(CONFIG_XILINX_UARTLITE) += serial_xuartlite.o
 COBJS-$(CONFIG_SCIF_CONSOLE) += serial_sh.o
 COBJS-$(CONFIG_USB_TTY) += usbtty.o
+COBJS-$(CONFIG_POLLUX_SERIAL) += serial_pollux.o
 
 COBJS	:= $(sort $(COBJS-y))
 SRCS	:= $(COBJS:.o=.c)
diff --git a/drivers/serial/serial_pollux.c b/drivers/serial/serial_pollux.c
new file mode 100644
index 0000000..62229dd
--- /dev/null
+++ b/drivers/serial/serial_pollux.c
@@ -0,0 +1,116 @@
+/* (C) Copyright 2010 cozybit, Inc.
+ * Brian Cavagnolo <brian at cozybit.com>
+ *
+ * (C) Copyright 2007 Leapfrog, Inc.
+ * Andrey Yurovsky" <yurovsky at gmail.com>
+ *
+ * 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/arch/reg.h>
+#include <asm/arch/uart.h>
+
+#ifndef CONFIG_CONSOLE_UART_BASE
+#error "Please define CONFIG_CONSOLE_UART_BASE to a suitable UARTx_BASE"
+#endif
+#define UART_BASE CONFIG_CONSOLE_UART_BASE
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define DEFAULT_BRD	1
+void serial_setbrg (void)
+{
+	int baudrate, brd;
+
+	if ((baudrate = gd->baudrate) <= 0)
+		baudrate = CONFIG_BAUDRATE;
+
+	/* we expect that the board-specific code set up the clock source such
+	 * that a BRD of 1 corresponds to a baudrate of 115200 bps.  We use
+	 * this fact to calculate the BRD for any baudrate.  We add one bit of
+	 * precision to the division so we can round to the best BRD.
+	 */
+	brd = ((((115200 << 1)*(DEFAULT_BRD + 1)/baudrate) + 1) >> 1) - 1;
+	REG16(UART_BASE + BRD) = brd;
+}
+
+int serial_init (void)
+{
+	/* expect that board-specific init has setup clock source */
+
+	/* disable UART clock */
+	REG32(UART_BASE + UARTCLKENB) &= ~(1<<UARTCLKGENENB);
+
+	/* clear IRQ pending, set 8 bit word length */
+	REG16(UART_BASE + LCON) = (1<<SYNC_PENDCLR)|(3<<WORD_LEN);
+
+	/* enable polling/IRQ transmit and receive */
+	REG16(UART_BASE + UCON) = (1<<TRANS_MODE)|(1<<RECEIVE_MODE);
+
+	/* reset the FIFOs */
+	REG16(UART_BASE + FCON) =
+		(1<<TX_FIFO_RESET)|(1<<RX_FIFO_RESET);
+
+	/* enable TX */
+	REG16(UART_BASE + MCON) = (1<<SCRXENB);
+
+	/* set the baud rate */
+	serial_setbrg();
+
+	/* enable UART clock */
+	REG32(UART_BASE + UARTCLKENB) |= (1<<UARTCLKGENENB);
+
+	return 0;
+}
+
+void serial_putc (const char c)
+{
+	u16 status, ready_mask;
+
+	ready_mask = (1<<TRANSMITTER_EMPTY)|(1<<TRANSMIT_BUFFER_EMPTY);
+	if(c == '\n')
+		serial_putc('\r');
+
+	while(1) { /* wait for transmitter to be ready */
+		status = REG16(UART_BASE + TRSTATUS);
+		if(status & ready_mask)
+			break;
+	}
+	/* transmit */
+	REG8(UART_BASE + THB) = c;
+}
+
+void serial_puts (const char *s)
+{
+	while (*s) {
+		serial_putc (*s++);
+	}
+}
+
+int serial_tstc (void)
+{
+	return (REG16(UART_BASE + FSTATUS) & 0xF);
+}
+
+int serial_getc (void)
+{
+	while(!serial_tstc());
+	return REG16(UART_BASE + RHB);
+}
-- 
1.6.0.4