[U-Boot] [PATCH 4/5] ZOOM2 Add serial support.

Tom Rix Tom.Rix at windriver.com
Tue Apr 28 17:41:53 CEST 2009


Zoom2 serial is in general supplied by one of the 4 UARTS on the debug board.
The default serial is from the USB connector on left side of the debug board.
The USB connector will produce 2 of the 4 UARTS.  On your host pick the first
enumeration.

The serial port set up is the same with Zoom1.
Baud rate 115200, 8 bit data, no parity, 1 stop bit, no flow.

The kernel bootargs are
console=ttyS3,115200n8

Signed-off-by: Tom Rix <Tom.Rix at windriver.com>
---
 board/omap3/zoom2/Makefile       |    3 +-
 board/omap3/zoom2/zoom2.c        |   30 +++++++++
 board/omap3/zoom2/zoom2_serial.c |  130 ++++++++++++++++++++++++++++++++++++++
 board/omap3/zoom2/zoom2_serial.h |   75 ++++++++++++++++++++++
 common/serial.c                  |    2 +
 drivers/serial/ns16550.c         |    4 +-
 include/configs/omap3_zoom2.h    |   28 ++++----
 include/serial.h                 |    7 ++
 8 files changed, 262 insertions(+), 17 deletions(-)
 create mode 100644 board/omap3/zoom2/zoom2_serial.c
 create mode 100644 board/omap3/zoom2/zoom2_serial.h

diff --git a/board/omap3/zoom2/Makefile b/board/omap3/zoom2/Makefile
index b8fa5a7..d27990c 100644
--- a/board/omap3/zoom2/Makefile
+++ b/board/omap3/zoom2/Makefile
@@ -26,7 +26,8 @@ include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(BOARD).a
 
 COBJS	:= zoom2.o \
-	debug_board.o
+	debug_board.o \
+	zoom2_serial.o
 
 SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
diff --git a/board/omap3/zoom2/zoom2.c b/board/omap3/zoom2/zoom2.c
index 0700c56..a2a5b5a 100644
--- a/board/omap3/zoom2/zoom2.c
+++ b/board/omap3/zoom2/zoom2.c
@@ -30,10 +30,24 @@
  */
 #include <common.h>
 #include <asm/io.h>
+#include <asm/arch/mem.h>
 #include <asm/arch/mux.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/mach-types.h>
 #include "zoom2.h"
+#include "zoom2_serial.h"
+
+extern void enable_gpmc_config(u32 *gpmc_config, gpmc_csx_t *gpmc_cs_base,
+			       u32 base, u32 size);
+
+static u32 gpmc_serial_TL16CP754C[GPMC_MAX_REG] = {
+	0x00011000,
+	0x001F1F01,
+	0x00080803,
+	0x1D091D09,
+	0x041D1F1F,
+	0x1D0904C4, 0
+};
 
 /*
  * Routine: board_init
@@ -42,13 +56,29 @@
 int board_init (void)
 {
 	DECLARE_GLOBAL_DATA_PTR;
+	gpmc_csx_t *serial_cs_base;
+	u32 *gpmc_config;
 
 	gpmc_init ();		/* in SRAM or SDRAM, finish GPMC */
+
+	/* Configure console support on zoom2 */
+	gpmc_config = gpmc_serial_TL16CP754C;
+	serial_cs_base = (gpmc_csx_t *) (GPMC_CONFIG_CS0_BASE +
+					 (3 * GPMC_CONFIG_WIDTH));
+	enable_gpmc_config(gpmc_config,
+			   serial_cs_base,
+			   SERIAL_TL16CP754C_BASE,
+			   GPMC_SIZE_16M);
+
 	/* board id for Linux */
 	gd->bd->bi_arch_number = MACH_TYPE_OMAP_ZOOM2;
 	/* boot param addr */
 	gd->bd->bi_boot_params = (OMAP34XX_SDRC_CS0 + 0x100);
 
+#if defined(CONFIG_STATUS_LED) && defined(STATUS_LED_BOOT)
+	status_led_set (STATUS_LED_BOOT, STATUS_LED_ON);
+#endif
+
 	return 0;
 }
 
diff --git a/board/omap3/zoom2/zoom2_serial.c b/board/omap3/zoom2/zoom2_serial.c
new file mode 100644
index 0000000..5e24fe0
--- /dev/null
+++ b/board/omap3/zoom2/zoom2_serial.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2009 Wind River Systems, Inc.
+ * Tom Rix <Tom.Rix at windriver.com>
+ *
+ * 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
+ *
+ * This file was adapted from cpu/mpc5xxx/serial.c
+ *
+ */
+
+#include <common.h>
+#include <serial.h>
+#include <ns16550.h>
+#include <asm/arch/cpu.h>
+#include "zoom2_serial.h"
+
+int quad_init_dev (unsigned long base)
+{
+	/*
+	 * The Quad UART is on the debug board.
+	 * Check if the debug board is attached before using the UART
+	 */
+	if (zoom2_debug_board_connected ()) {
+		NS16550_t com_port = (NS16550_t) base;
+		int baud_divisor = CONFIG_SYS_NS16550_CLK / 16 /
+			CONFIG_BAUDRATE;
+
+		/*
+		 * Zoom2 has a board specific initialization of its UART.
+		 * This generic initialization has been copied from
+		 * drivers/serial/ns16550.c. The macros have been expanded.
+		 *
+		 * Do the following instead of
+		 *
+		 * NS16550_init (port, clock_divisor);
+		 */
+		com_port->ier = 0x00;
+
+		/*
+		 * On Zoom2 board Set pre-scalar to 1
+		 * CLKSEL is GND => MCR[7] is 1 => preslr is 4
+		 * So change the prescl to 1
+		 */
+		com_port->lcr = 0xBF;
+		com_port->fcr |= 0x10;
+		com_port->mcr &= 0x7F;
+
+		/* This is generic ns16550.c setup */
+		com_port->lcr = UART_LCR_BKSE | UART_LCR_8N1;
+		com_port->dll = 0;
+		com_port->dlm = 0;
+		com_port->lcr = UART_LCR_8N1;
+		com_port->mcr = UART_MCR_DTR | UART_MCR_RTS;
+		com_port->fcr = UART_FCR_FIFO_EN | UART_FCR_RXSR |
+			UART_FCR_TXSR;
+		com_port->lcr = UART_LCR_BKSE | UART_LCR_8N1;
+		com_port->dll = baud_divisor & 0xff;
+		com_port->dlm = (baud_divisor >> 8) & 0xff;
+		com_port->lcr = UART_LCR_8N1;
+	}
+	/*
+	 * We have to lie here, otherwise the board init code will hang
+	 * on the check
+	 */
+	return 0;
+}
+
+void quad_putc_dev (unsigned long base, const char c)
+{
+	if (zoom2_debug_board_connected ()) {
+
+		if (c == '\n')
+			quad_putc_dev (base, '\r');
+
+		NS16550_putc ((NS16550_t) base, c);
+	}
+}
+
+void quad_puts_dev (unsigned long base, const char *s)
+{
+	if (zoom2_debug_board_connected ()) {
+		while ((s != NULL) && (*s != '\0'))
+			quad_putc_dev (base, *s++);
+	}
+}
+
+int quad_getc_dev (unsigned long base)
+{
+	if (zoom2_debug_board_connected ())
+		return NS16550_getc ((NS16550_t) base);
+	else
+		return 0;
+}
+
+int quad_tstc_dev (unsigned long base)
+{
+	if (zoom2_debug_board_connected ())
+		return NS16550_tstc ((NS16550_t) base);
+	else
+		return 0;
+}
+
+void quad_setbrg_dev (unsigned long base)
+{
+	if (zoom2_debug_board_connected ()) {
+
+		int clock_divisor = CONFIG_SYS_NS16550_CLK / 16 /
+			CONFIG_BAUDRATE;
+
+		NS16550_reinit ((NS16550_t) base, clock_divisor);
+	}
+}
+
+QUAD_INIT (0)
+QUAD_INIT (1)
+QUAD_INIT (2)
+QUAD_INIT (3)
diff --git a/board/omap3/zoom2/zoom2_serial.h b/board/omap3/zoom2/zoom2_serial.h
new file mode 100644
index 0000000..ccd42c9
--- /dev/null
+++ b/board/omap3/zoom2/zoom2_serial.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2009 Wind River Systems, Inc.
+ * Tom Rix <Tom.Rix at windriver.com>
+ *
+ * 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
+ *
+ */
+
+#ifndef ZOOM2_SERIAL_H
+#define ZOOM2_SERIAL_H
+
+extern int zoom2_debug_board_connected (void);
+
+#define SERIAL_TL16CP754C_BASE	0x10000000      /* Zoom2 Serial chip address */
+
+#define QUAD_BASE_0      SERIAL_TL16CP754C_BASE
+#define QUAD_BASE_1      (SERIAL_TL16CP754C_BASE + 0x100)
+#define QUAD_BASE_2      (SERIAL_TL16CP754C_BASE + 0x200)
+#define QUAD_BASE_3      (SERIAL_TL16CP754C_BASE + 0x300)
+
+#define S(a) #a
+#define N(a) S(quad##a)
+#define U(a) S(UART##a)
+
+#define QUAD_INIT(n)				\
+int quad_init_##n(void)				\
+{						\
+	return quad_init_dev(QUAD_BASE_##n);	\
+}						\
+void quad_setbrg_##n(void)			\
+{						\
+	quad_setbrg_dev(QUAD_BASE_##n);		\
+}						\
+void quad_putc_##n(const char c)		\
+{						\
+	quad_putc_dev(QUAD_BASE_##n, c);	\
+}						\
+void quad_puts_##n(const char *s)		\
+{						\
+	quad_puts_dev(QUAD_BASE_##n, s);	\
+}						\
+int quad_getc_##n(void)				\
+{						\
+	return quad_getc_dev(QUAD_BASE_##n);	\
+}						\
+int quad_tstc_##n(void)				\
+{						\
+	return quad_tstc_dev(QUAD_BASE_##n);	\
+}						\
+struct serial_device zoom2_serial_device##n =	\
+{						\
+	N(n),					\
+	U(n),					\
+	quad_init_##n,				\
+	quad_setbrg_##n,			\
+	quad_getc_##n,				\
+	quad_tstc_##n,				\
+	quad_putc_##n,				\
+	quad_puts_##n,				\
+};
+
+#endif /* ZOOM2_SERIAL_H */
diff --git a/common/serial.c b/common/serial.c
index 09385d0..3e9135b 100644
--- a/common/serial.c
+++ b/common/serial.c
@@ -68,6 +68,8 @@ struct serial_device *__default_serial_console (void)
 #else
 #error "CONFIG_SERIAL? missing."
 #endif
+#elif defined(CONFIG_OMAP3_ZOOM2)
+		return DEFAULT_ZOOM2_SERIAL_DEVICE;
 #else
 #error No default console
 #endif
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 657c9da..2fcc8c3 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -17,7 +17,7 @@
 void NS16550_init (NS16550_t com_port, int baud_divisor)
 {
 	com_port->ier = 0x00;
-#ifdef CONFIG_OMAP
+#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
 	com_port->mdr1 = 0x7;	/* mode select reset TL16C750*/
 #endif
 	com_port->lcr = UART_LCR_BKSE | UART_LCRVAL;
@@ -30,7 +30,7 @@ void NS16550_init (NS16550_t com_port, int baud_divisor)
 	com_port->dll = baud_divisor & 0xff;
 	com_port->dlm = (baud_divisor >> 8) & 0xff;
 	com_port->lcr = UART_LCRVAL;
-#if defined(CONFIG_OMAP)
+#if defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)
 #if defined(CONFIG_APTIX)
 	com_port->mdr1 = 3;	/* /13 mode so Aptix 6MHz can hit 115200 */
 #else
diff --git a/include/configs/omap3_zoom2.h b/include/configs/omap3_zoom2.h
index 1517145..8f09dd8 100644
--- a/include/configs/omap3_zoom2.h
+++ b/include/configs/omap3_zoom2.h
@@ -69,26 +69,26 @@
 
 /*
  * NS16550 Configuration
+ * Zoom2 uses the TL16CP754C on the debug board
  */
-#define V_NS16550_CLK			48000000	/* 48MHz (APLL96/2) */
-
-#define CONFIG_SYS_NS16550
-#define CONFIG_SYS_NS16550_SERIAL
-#define CONFIG_SYS_NS16550_REG_SIZE	(-4)
-#define CONFIG_SYS_NS16550_CLK		V_NS16550_CLK
-
+#define CONFIG_SERIAL_MULTI      1
 /*
- * select serial console configuration
+ * 0 - 1 : first  USB with respect to the left edge of the debug board
+ * 2 - 3 : second USB with respect to the left edge of the debug board
  */
-#define CONFIG_CONS_INDEX		3
-#define CONFIG_SYS_NS16550_COM3		OMAP34XX_UART3
-#define CONFIG_SERIAL3			3	/* UART3 */
+#define DEFAULT_ZOOM2_SERIAL_DEVICE (&zoom2_serial_device0)
+
+#define V_NS16550_CLK            (1843200)  /* 1.8432 Mhz */
+
+#define CONFIG_SYS_NS16550
+#define CONFIG_SYS_NS16550_REG_SIZE     (-2)
+#define CONFIG_SYS_NS16550_CLK          V_NS16550_CLK
+#define CONFIG_BAUDRATE          115200
+#define CONFIG_SYS_BAUDRATE_TABLE   {115200}
 
 /* allow to overwrite serial and ethaddr */
 #define CONFIG_ENV_OVERWRITE
-#define CONFIG_BAUDRATE			115200
-#define CONFIG_SYS_BAUDRATE_TABLE	{4800, 9600, 19200, 38400, 57600,\
-					115200}
+
 #define CONFIG_MMC			1
 #define CONFIG_OMAP3_MMC		1
 #define CONFIG_DOS_PARTITION		1
diff --git a/include/serial.h b/include/serial.h
index e3d8b36..aca5221 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -42,6 +42,13 @@ extern struct serial_device s3c24xx_serial1_device;
 extern struct serial_device s3c24xx_serial2_device;
 #endif
 
+#if defined(CONFIG_OMAP3_ZOOM2)
+extern struct serial_device zoom2_serial_device0;
+extern struct serial_device zoom2_serial_device1;
+extern struct serial_device zoom2_serial_device2;
+extern struct serial_device zoom2_serial_device3;
+#endif
+
 extern struct serial_device serial_ffuart_device;
 extern struct serial_device serial_btuart_device;
 extern struct serial_device serial_stuart_device;
-- 
1.6.0.5



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