[U-Boot] [PATCH 2/4] led_display: split led display support into generic and hw-dependent parts
Ilya Yanok
yanok at emcraft.com
Thu Sep 9 23:03:32 CEST 2010
Split the display command into generic interface and hardware-specific
realization for PDSP188x LED display found on hmi1001 and manroland
boards. Simple interface for LED displays is defined in
include/led-display.h and described in doc/README.LED_display.
Driver-specific implementation was moved into drivers/misc/pdsp188x.c
file (enabled with CONFIG_PDSP188x set).
Signed-off-by: Ilya Yanok <yanok at emcraft.com>
---
common/cmd_display.c | 26 ++++++-----------
doc/README.LED_display | 28 +++++++++++++++++
drivers/misc/Makefile | 1 +
drivers/misc/pdsp188x.c | 57 ++++++++++++++++++++++++++++++++++++
include/configs/hmi1001.h | 1 +
include/configs/manroland/common.h | 5 +++
include/led-display.h | 36 ++++++++++++++++++++++
7 files changed, 137 insertions(+), 17 deletions(-)
create mode 100644 doc/README.LED_display
create mode 100644 drivers/misc/pdsp188x.c
create mode 100644 include/led-display.h
diff --git a/common/cmd_display.c b/common/cmd_display.c
index 6c11aa6..d5d5d8c 100644
--- a/common/cmd_display.c
+++ b/common/cmd_display.c
@@ -23,40 +23,32 @@
#include <common.h>
#include <command.h>
+#include <led-display.h>
#undef DEBUG_DISP
-#define DISP_SIZE 8
-#define CWORD_CLEAR 0x80
-#define CLEAR_DELAY (110 * 2)
-
int do_display (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int i;
- int pos;
/* Clear display */
- *((volatile char*)(CONFIG_SYS_DISP_CWORD)) = CWORD_CLEAR;
- udelay(1000 * CLEAR_DELAY);
+ display_set(DISPLAY_CLEAR | DISPLAY_HOME);
if (argc < 2)
return (0);
- for (pos = 0, i = 1; i < argc && pos < DISP_SIZE; i++) {
- char *p = argv[i], c;
+ for (i = 1; i < argc; i++) {
+ char *p = argv[i];
- if (i > 1) {
- *((volatile uchar *) (CONFIG_SYS_DISP_CHR_RAM + pos++)) = ' ';
-#ifdef DEBUG_DISP
- putc(' ');
-#endif
+ if (i > 1) { /* Insert a space between strings */
+ display_putc(' ');
}
- while ((c = *p++) != '\0' && pos < DISP_SIZE) {
- *((volatile uchar *) (CONFIG_SYS_DISP_CHR_RAM + pos++)) = c;
+ while ((*p)) {
#ifdef DEBUG_DISP
- putc(c);
+ putc(*p);
#endif
+ display_putc(*p++);
}
}
diff --git a/doc/README.LED_display b/doc/README.LED_display
new file mode 100644
index 0000000..c79aca6
--- /dev/null
+++ b/doc/README.LED_display
@@ -0,0 +1,28 @@
+LED display internal API
+=======================================
+
+This README describes the LED display API.
+
+The API is defined by the include file include/led-display.h
+
+The first step in to define CONFIG_CMD_DISPLAY in the board config file.
+Then you need to provide the following functions to access LED display:
+
+void display_set(int cmd);
+
+This function should control the state of the LED display. Argument is
+an ORed combination of the following values:
+ DISPLAY_CLEAR -- clear the display
+ DISPLAY_HOME -- set the position to the beginning of display
+ DISPLAY_MARK -- enable mark (decimal point), if implemented
+
+int display_putc(char c);
+
+This function should display it's parameter on the LED display in the
+current position. Returns the displayed character on success or -1 in
+case of failure.
+
+With this functions defined 'display' command will display it's
+arguments on the LED display (or clear the display if called without
+arguments).
+
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 4f15db9..5d668f8 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -33,6 +33,7 @@ COBJS-$(CONFIG_NS87308) += ns87308.o
COBJS-$(CONFIG_STATUS_LED) += status_led.o
COBJS-$(CONFIG_TWL4030_LED) += twl4030_led.o
COBJS-$(CONFIG_FSL_PMIC) += fsl_pmic.o
+COBJS-$(CONFIG_PDSP188x) += pdsp188x.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/misc/pdsp188x.c b/drivers/misc/pdsp188x.c
new file mode 100644
index 0000000..656b6ee
--- /dev/null
+++ b/drivers/misc/pdsp188x.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2010 Sergey Poselenov, Emcraft Systems, <sposelenov at emcraft.com>
+ * Copyright 2010 Ilya Yanok, Emcraft Systems, <yanok at emcraft.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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <common.h>
+#include <led-display.h>
+#include <asm/io.h>
+
+#ifdef CONFIG_CMD_DISPLAY
+#define CWORD_CLEAR 0x80
+#define CLEAR_DELAY (110 * 2)
+#define DISPLAY_SIZE 8
+
+static int pos; /* Current display position */
+
+/* Handle different display commands */
+void display_set(int cmd)
+{
+ if (cmd & DISPLAY_CLEAR) {
+ out_8((unsigned char *)CONFIG_SYS_DISP_CWORD, CWORD_CLEAR);
+ udelay(1000 * CLEAR_DELAY);
+ }
+
+ if (cmd & DISPLAY_HOME) {
+ pos = 0;
+ }
+}
+
+/*
+ * Display a character at the current display position.
+ * Characters beyond the display size are ignored.
+ */
+int display_putc(char c)
+{
+ if (pos >= DISPLAY_SIZE)
+ return -1;
+
+ out_8((unsigned char *)CONFIG_SYS_DISP_CHR_RAM + pos++, c);
+
+ return c;
+}
+#endif
diff --git a/include/configs/hmi1001.h b/include/configs/hmi1001.h
index f9cdcbc..e5eb966 100644
--- a/include/configs/hmi1001.h
+++ b/include/configs/hmi1001.h
@@ -350,6 +350,7 @@
/* Display addresses */
/*---------------------------------------------------------------------*/
+#define CONFIG_PDSP188x
#define CONFIG_SYS_DISP_CHR_RAM (CONFIG_SYS_DISPLAY_BASE + 0x38)
#define CONFIG_SYS_DISP_CWORD (CONFIG_SYS_DISPLAY_BASE + 0x30)
diff --git a/include/configs/manroland/common.h b/include/configs/manroland/common.h
index 0224608..291b669 100644
--- a/include/configs/manroland/common.h
+++ b/include/configs/manroland/common.h
@@ -55,6 +55,11 @@
#define CONFIG_CMD_MII
#define CONFIG_CMD_SNTP
+/*
+ * 8-symbol LED display (can be accessed with 'display' command)
+ */
+#define CONFIG_PDSP188x
+
#define CONFIG_TIMESTAMP 1 /* Print image info with timestamp */
/*
diff --git a/include/led-display.h b/include/led-display.h
new file mode 100644
index 0000000..41c3744
--- /dev/null
+++ b/include/led-display.h
@@ -0,0 +1,36 @@
+/*
+ * (C) Copyright 2005-2010
+ * Wolfgang Denk, DENX Software Engineering, wd at denx.de.
+ *
+ * (C) Copyright 2010
+ * Sergei Poselenov, Emcraft Systems, sposelenov at emcraft.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
+ */
+#ifndef _led_display_h_
+#define _led_display_h_
+
+/* Display Commands */
+#define DISPLAY_CLEAR 0x1 /* Clear the display */
+#define DISPLAY_HOME 0x2 /* Set cursor at home position */
+#define DISPLAY_MARK 0x4 /* Enable the decimal point led, if implemented */
+
+void display_set(int cmd);
+int display_putc(char c);
+#endif
--
1.6.2.5
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