Add UART console support for Vybrid platform

Signed-off-by: TsiChung Liew <tsicliew@gmail.com>

2 files changed, 114 insertions, 0 deletions

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 616b85703b..84a595c07b 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -55,6 +55,7 @@ COBJS-$(CONFIG_S3C44B0_SERIAL) += serial_s3c44b0.o
 COBJS-$(CONFIG_XILINX_UARTLITE) += serial_xuartlite.o
 COBJS-$(CONFIG_SANDBOX_SERIAL) += sandbox.o
 COBJS-$(CONFIG_SCIF_CONSOLE) += serial_sh.o
+COBJS-$(CONFIG_VYBRID_UART) += serial_vybrid.o
 
 ifndef CONFIG_SPL_BUILD
 COBJS-$(CONFIG_USB_TTY) += usbtty.o
diff --git a/drivers/serial/serial_vybrid.c b/drivers/serial/serial_vybrid.c
new file mode 100644
index 0000000000..89c51625c6
--- /dev/null
+++ b/drivers/serial/serial_vybrid.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ *
+ * 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 <watchdog.h>
+#include <asm/io.h>
+#include <asm/arch/vybrid-regs.h>
+#include <asm/arch/serial-vybrid.h>
+#include <asm/arch/clock.h>
+
+#ifndef CONFIG_VYBRID_UART_BASE
+#error "define CONFIG_VYBRID_UART_BASE to use the VYBRID UART driver"
+#endif
+
+#define UART_CONSOLE	\
+		(CONFIG_VYBRID_UART_BASE + (CONFIG_SYS_UART_PORT * 0x1000))
+
+#ifdef CONFIG_SERIAL_MULTI
+#warning "Vybrid driver does not support MULTI serials."
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void serial_setbrg(void)
+{
+	u32 clk = vybrid_get_uartclk();
+	u16 sbr;
+
+	if (!gd->baudrate)
+		gd->baudrate = CONFIG_BAUDRATE;
+
+	sbr = (u16)(clk / (16 * gd->baudrate));
+	/* place adjustment later - n/32 BRFA */
+
+	out_8((UART_CONSOLE + UBDH), (sbr >> 8));
+	out_8((UART_CONSOLE + UBDL), (sbr & 0xFF));
+}
+
+int serial_getc(void)
+{
+	while (!(in_8(UART_CONSOLE + US1) & US1_RDRF))
+		WATCHDOG_RESET();
+
+	setbits_8((UART_CONSOLE + US1), US1_RDRF);
+
+	return in_8(UART_CONSOLE + UD);
+}
+
+void serial_putc(const char c)
+{
+	if (c == '\n')
+		serial_putc('\r');
+
+	while (!(in_8(UART_CONSOLE + US1) & US1_TDRE))
+		WATCHDOG_RESET();
+
+	out_8((UART_CONSOLE + UD), c);
+}
+
+/*
+ * Test whether a character is in the RX buffer
+ */
+int serial_tstc(void)
+{
+	if (in_8(UART_CONSOLE + URCFIFO) == 0)
+		return 0;
+
+	return 1;
+}
+
+void
+serial_puts(const char *s)
+{
+	while (*s)
+		serial_putc(*s++);
+}
+
+/*
+ * 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)
+{
+	clrbits_8((UART_CONSOLE + UC2), UC2_RE);
+	clrbits_8((UART_CONSOLE + UC2), UC2_TE);
+
+	out_8((UART_CONSOLE + UMODEM), 0);
+	out_8((UART_CONSOLE + UC1), 0);
+
+	/* provide data bits, parity, stop bit, etc */
+
+	serial_setbrg();
+
+	out_8((UART_CONSOLE + UC2), (UC2_RE | UC2_TE));
+
+	return 0;
+}