[U-Boot] [PATCH 3/5] vybrid: add uart driver support

[Alison Wang]

This patch adds uart driver support for vybrid platform.

Signed-off-by: TsiChung Liew <tsicliew at gmail.com>
Signed-off-by: Jason Jin <Jason.jin at freescale.com>
Signed-off-by: Alison Wang <b18965 at freescale.com>
---
 drivers/serial/Makefile        |   1 +
 drivers/serial/serial.c        |   2 +
 drivers/serial/serial_vybrid.c | 129 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 132 insertions(+)
 create mode 100644 drivers/serial/serial_vybrid.c

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index de3f471..776e018 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -53,6 +53,7 @@ COBJS-$(CONFIG_XILINX_UARTLITE) += serial_xuartlite.o
 COBJS-$(CONFIG_SANDBOX_SERIAL) += sandbox.o
 COBJS-$(CONFIG_SCIF_CONSOLE) += serial_sh.o
 COBJS-$(CONFIG_ZYNQ_SERIAL) += serial_zynq.o
+COBJS-$(CONFIG_VYBRID_UART) += serial_vybrid.o
 
 ifndef CONFIG_SPL_BUILD
 COBJS-$(CONFIG_USB_TTY) += usbtty.o
diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index 7922bf0..903a520 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -178,6 +178,7 @@ serial_initfunc(pl01x_serial_initialize);
 serial_initfunc(s3c44b0_serial_initialize);
 serial_initfunc(sa1100_serial_initialize);
 serial_initfunc(sh_serial_initialize);
+serial_initfunc(vybrid_serial_initialize);
 
 /**
  * serial_register() - Register serial driver with serial driver core
@@ -272,6 +273,7 @@ void serial_initialize(void)
 	s3c44b0_serial_initialize();
 	sa1100_serial_initialize();
 	sh_serial_initialize();
+	vybrid_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }
diff --git a/drivers/serial/serial_vybrid.c b/drivers/serial/serial_vybrid.c
new file mode 100644
index 0000000..4dd9b52
--- /dev/null
+++ b/drivers/serial/serial_vybrid.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2012-2013 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 <serial.h>
+#include <linux/compiler.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;
+
+static void vybrid_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));
+}
+
+static int vybrid_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);
+}
+
+static void vybrid_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
+ */
+static int vybrid_serial_tstc(void)
+{
+	if (in_8(UART_CONSOLE + URCFIFO) == 0)
+		return 0;
+
+	return 1;
+}
+
+/*
+ * Initialise the serial port with the given baudrate. The settings
+ * are always 8 data bits, no parity, 1 stop bit, no start bits.
+ */
+static int vybrid_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;
+}
+
+static struct serial_device vybrid_serial_drv = {
+	.name = "vybrid_serial",
+	.start = vybrid_serial_init,
+	.stop = NULL,
+	.setbrg = vybrid_serial_setbrg,
+	.putc = vybrid_serial_putc,
+	.puts = default_serial_puts,
+	.getc = vybrid_serial_getc,
+	.tstc = vybrid_serial_tstc,
+};
+
+void vybrid_serial_initialize(void)
+{
+	serial_register(&vybrid_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &vybrid_serial_drv;
+}
-- 
1.8.0