summaryrefslogtreecommitdiff
path: root/board/cogent
diff options
context:
space:
mode:
authorwdenk <wdenk>2002-11-03 00:38:21 +0000
committerwdenk <wdenk>2002-11-03 00:38:21 +0000
commitfe8c2806cdba70479e351299881a395dc2be7785 (patch)
treea1e8b98a1838cba6e6f5c765d9d85339257c45f5 /board/cogent
parentf9087a3213cc245cf9b90436475b5af822bd7579 (diff)
downloadu-boot-imx-fe8c2806cdba70479e351299881a395dc2be7785.zip
u-boot-imx-fe8c2806cdba70479e351299881a395dc2be7785.tar.gz
u-boot-imx-fe8c2806cdba70479e351299881a395dc2be7785.tar.bz2
Initial revision
Diffstat (limited to 'board/cogent')
-rw-r--r--board/cogent/lcd.c231
-rw-r--r--board/cogent/lcd.h84
2 files changed, 315 insertions, 0 deletions
diff --git a/board/cogent/lcd.c b/board/cogent/lcd.c
new file mode 100644
index 0000000..941ea65
--- /dev/null
+++ b/board/cogent/lcd.c
@@ -0,0 +1,231 @@
+/* most of this is taken from the file */
+/* hal/powerpc/cogent/current/src/hal_diag.c in the */
+/* Cygnus eCos source. Here is the copyright notice: */
+/* */
+/*============================================================================= */
+/* */
+/* hal_diag.c */
+/* */
+/* HAL diagnostic output code */
+/* */
+/*============================================================================= */
+/*####COPYRIGHTBEGIN#### */
+/* */
+/* ------------------------------------------- */
+/* The contents of this file are subject to the Cygnus eCos Public License */
+/* Version 1.0 (the "License"); you may not use this file except in */
+/* compliance with the License. You may obtain a copy of the License at */
+/* http://sourceware.cygnus.com/ecos */
+/* */
+/* Software distributed under the License is distributed on an "AS IS" */
+/* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the */
+/* License for the specific language governing rights and limitations under */
+/* the License. */
+/* */
+/* The Original Code is eCos - Embedded Cygnus Operating System, released */
+/* September 30, 1998. */
+/* */
+/* The Initial Developer of the Original Code is Cygnus. Portions created */
+/* by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. */
+/* ------------------------------------------- */
+/* */
+/*####COPYRIGHTEND#### */
+/*============================================================================= */
+/*#####DESCRIPTIONBEGIN#### */
+/* */
+/* Author(s): nickg, jskov */
+/* Contributors: nickg, jskov */
+/* Date: 1999-03-23 */
+/* Purpose: HAL diagnostic output */
+/* Description: Implementations of HAL diagnostic output support. */
+/* */
+/*####DESCRIPTIONEND#### */
+/* */
+/*============================================================================= */
+
+/*----------------------------------------------------------------------------- */
+/* Cogent board specific LCD code */
+
+#include <common.h>
+#include <stdarg.h>
+#include <board/cogent/lcd.h>
+
+static char lines[2][LCD_LINE_LENGTH+1];
+static int curline;
+static int linepos;
+static int heartbeat_active;
+/* make the next two strings exactly LCD_LINE_LENGTH (16) chars long */
+/* pad to the right with spaces if necessary */
+static char init_line0[LCD_LINE_LENGTH+1] = "U-Boot Cogent ";
+static char init_line1[LCD_LINE_LENGTH+1] = "mjj, 11 Aug 2000";
+
+static inline unsigned char
+lcd_read_status(cma_mb_lcd *clp)
+{
+ /* read the Busy Status Register */
+ return (cma_mb_reg_read(&clp->lcd_bsr));
+}
+
+static inline void
+lcd_wait_not_busy(cma_mb_lcd *clp)
+{
+ /*
+ * wait for not busy
+ * Note: It seems that the LCD isn't quite ready to process commands
+ * when it clears the BUSY flag. Reading the status address an extra
+ * time seems to give it enough breathing room.
+ */
+
+ while (lcd_read_status(clp) & LCD_STAT_BUSY)
+ ;
+
+ (void)lcd_read_status(clp);
+}
+
+static inline void
+lcd_write_command(cma_mb_lcd *clp, unsigned char cmd)
+{
+ lcd_wait_not_busy(clp);
+
+ /* write the Command Register */
+ cma_mb_reg_write(&clp->lcd_cmd, cmd);
+}
+
+static inline void
+lcd_write_data(cma_mb_lcd *clp, unsigned char data)
+{
+ lcd_wait_not_busy(clp);
+
+ /* write the Current Character Register */
+ cma_mb_reg_write(&clp->lcd_ccr, data);
+}
+
+static inline void
+lcd_dis(int addr, char *string)
+{
+ cma_mb_lcd *clp = (cma_mb_lcd *)CMA_MB_LCD_BASE;
+ int pos, linelen;
+
+ linelen = LCD_LINE_LENGTH;
+ if (heartbeat_active && addr == LCD_LINE0)
+ linelen--;
+
+ lcd_write_command(clp, LCD_CMD_ADD + addr);
+ for (pos = 0; *string != '\0' && pos < linelen; pos++)
+ lcd_write_data(clp, *string++);
+}
+
+void
+lcd_init(void)
+{
+ cma_mb_lcd *clp = (cma_mb_lcd *)CMA_MB_LCD_BASE;
+ int i;
+
+ /* configure the lcd for 8 bits/char, 2 lines and 5x7 dot matrix */
+ lcd_write_command(clp, LCD_CMD_MODE);
+
+ /* turn the LCD display on */
+ lcd_write_command(clp, LCD_CMD_DON);
+
+ curline = 0;
+ linepos = 0;
+
+ for (i = 0; i < LCD_LINE_LENGTH; i++) {
+ lines[0][i] = init_line0[i];
+ lines[1][i] = init_line1[i];
+ }
+
+ lines[0][LCD_LINE_LENGTH] = lines[1][LCD_LINE_LENGTH] = 0;
+
+ lcd_dis(LCD_LINE0, lines[0]);
+ lcd_dis(LCD_LINE1, lines[1]);
+
+ printf("HD44780 2 line x %d char display\n", LCD_LINE_LENGTH);
+}
+
+void
+lcd_write_char(const char c)
+{
+ int i, linelen;
+
+ /* ignore CR */
+ if (c == '\r')
+ return;
+
+ linelen = LCD_LINE_LENGTH;
+ if (heartbeat_active && curline == 0)
+ linelen--;
+
+ if (c == '\n') {
+ lcd_dis(LCD_LINE0, &lines[curline^1][0]);
+ lcd_dis(LCD_LINE1, &lines[curline][0]);
+
+ /* Do a line feed */
+ curline ^= 1;
+ linelen = LCD_LINE_LENGTH;
+ if (heartbeat_active && curline == 0)
+ linelen--;
+ linepos = 0;
+
+ for (i = 0; i < linelen; i++)
+ lines[curline][i] = ' ';
+
+ return;
+ }
+
+ /* Only allow to be output if there is room on the LCD line */
+ if (linepos < linelen)
+ lines[curline][linepos++] = c;
+}
+
+void
+lcd_flush(void)
+{
+ lcd_dis(LCD_LINE1, &lines[curline][0]);
+}
+
+void
+lcd_write_string(const char *s)
+{
+ char *p;
+
+ for (p = (char *)s; *p != '\0'; p++)
+ lcd_write_char(*p);
+}
+
+void
+lcd_printf(const char *fmt, ...)
+{
+ va_list args;
+ char buf[CFG_PBSIZE];
+
+ va_start(args, fmt);
+ (void)vsprintf(buf, fmt, args);
+ va_end(args);
+
+ lcd_write_string(buf);
+}
+
+void
+lcd_heartbeat(void)
+{
+ cma_mb_lcd *clp = (cma_mb_lcd *)CMA_MB_LCD_BASE;
+#if 0
+ static char rotchars[] = { '|', '/', '-', '\\' };
+#else
+ /* HD44780 Rom Code A00 has no backslash */
+ static char rotchars[] = { '|', '/', '-', '\315' };
+#endif
+ static int rotator_index = 0;
+
+ heartbeat_active = 1;
+
+ /* write the address */
+ lcd_write_command(clp, LCD_CMD_ADD + LCD_LINE0 + (LCD_LINE_LENGTH - 1));
+
+ /* write the next char in the sequence */
+ lcd_write_data(clp, rotchars[rotator_index]);
+
+ if (++rotator_index >= (sizeof rotchars / sizeof rotchars[0]))
+ rotator_index = 0;
+}
diff --git a/board/cogent/lcd.h b/board/cogent/lcd.h
new file mode 100644
index 0000000..1056eea
--- /dev/null
+++ b/board/cogent/lcd.h
@@ -0,0 +1,84 @@
+/* most of this is taken from the file */
+/* hal/powerpc/cogent/current/src/hal_diag.c in the */
+/* Cygnus eCos source. Here is the copyright notice: */
+/* */
+/*============================================================================= */
+/* */
+/* hal_diag.c */
+/* */
+/* HAL diagnostic output code */
+/* */
+/*============================================================================= */
+/*####COPYRIGHTBEGIN#### */
+/* */
+/* ------------------------------------------- */
+/* The contents of this file are subject to the Cygnus eCos Public License */
+/* Version 1.0 (the "License"); you may not use this file except in */
+/* compliance with the License. You may obtain a copy of the License at */
+/* http://sourceware.cygnus.com/ecos */
+/* */
+/* Software distributed under the License is distributed on an "AS IS" */
+/* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the */
+/* License for the specific language governing rights and limitations under */
+/* the License. */
+/* */
+/* The Original Code is eCos - Embedded Cygnus Operating System, released */
+/* September 30, 1998. */
+/* */
+/* The Initial Developer of the Original Code is Cygnus. Portions created */
+/* by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. */
+/* ------------------------------------------- */
+/* */
+/*####COPYRIGHTEND#### */
+/*============================================================================= */
+/*#####DESCRIPTIONBEGIN#### */
+/* */
+/* Author(s): nickg, jskov */
+/* Contributors: nickg, jskov */
+/* Date: 1999-03-23 */
+/* Purpose: HAL diagnostic output */
+/* Description: Implementations of HAL diagnostic output support. */
+/* */
+/*####DESCRIPTIONEND#### */
+/* */
+/*============================================================================= */
+
+/* FEMA 162B 16 character x 2 line LCD */
+
+/* status register bit definitions */
+#define LCD_STAT_BUSY 0x80 /* 1 = display busy */
+#define LCD_STAT_ADD 0x7F /* bits 0-6 return current display address */
+
+/* command register definitions */
+#define LCD_CMD_RST 0x01 /* clear entire display and reset display addr */
+#define LCD_CMD_HOME 0x02 /* reset display address and reset any shifting */
+#define LCD_CMD_ECL 0x04 /* move cursor left one pos on next data write */
+#define LCD_CMD_ESL 0x05 /* shift display left one pos on next data write */
+#define LCD_CMD_ECR 0x06 /* move cursor right one pos on next data write */
+#define LCD_CMD_ESR 0x07 /* shift disp right one pos on next data write */
+#define LCD_CMD_DOFF 0x08 /* display off, cursor off, blinking off */
+#define LCD_CMD_BL 0x09 /* blink character at current cursor position */
+#define LCD_CMD_CUR 0x0A /* enable cursor on */
+#define LCD_CMD_DON 0x0C /* turn display on */
+#define LCD_CMD_CL 0x10 /* move cursor left one position */
+#define LCD_CMD_SL 0x14 /* shift display left one position */
+#define LCD_CMD_CR 0x18 /* move cursor right one position */
+#define LCD_CMD_SR 0x1C /* shift display right one position */
+#define LCD_CMD_MODE 0x38 /* sets 8 bits, 2 lines, 5x7 characters */
+#define LCD_CMD_ACG 0x40 /* bits 0-5 sets character generator address */
+#define LCD_CMD_ADD 0x80 /* bits 0-6 sets display data addr to line 1 + */
+
+/* LCD status values */
+#define LCD_OK 0x00
+#define LCD_ERR 0x01
+
+#define LCD_LINE0 0x00
+#define LCD_LINE1 0x40
+
+#define LCD_LINE_LENGTH 16
+
+extern void lcd_init(void);
+extern void lcd_write_char(const char);
+extern void lcd_flush(void);
+extern void lcd_write_string(const char *);
+extern void lcd_printf(const char *, ...);