Add PIXIS FPGA support for MPC8641HPCN board.

Move the 8641HPCN's PIXIS code to the new directory
board/freescale/common/ as it will be shared by
future boards not in the same processor family.

Write a "pixis_reset" command that utilizes the FPGA
reset sequencer to support alternate soft-reset options
such as using the "alternate" flash bank, enabling
the watch dog, or choosing different CPU frequencies.

Add documentation for the pixis_reset to README.mpc8641hpcn.

Signed-off-by: Haiying Wang <haiying.wang@freescale.com>
Signed-off-by: Jon Loeliger <jdl@freescale.com>

4 files changed, 163 insertions, 119 deletions

diff --git a/board/mpc8641hpcn/pixis.c b/board/freescale/common/pixis.c
index 964a17c..af98157 100644
--- a/board/mpc8641hpcn/pixis.c
+++ b/board/freescale/common/pixis.c
@@ -23,14 +23,25 @@
  */
 
 #include <common.h>
-#include <watchdog.h>
 #include <command.h>
+#include <watchdog.h>
 #include <asm/cache.h>
-#include <mpc86xx.h>
 
 #include "pixis.h"
 
 
+static ulong strfractoint(uchar *strptr);
+
+
+/*
+ * Simple board reset.
+ */
+void pixis_reset(void)
+{
+    out8(PIXIS_BASE + PIXIS_RST, 0);
+}
+
+
 /*
  * Per table 27, page 58 of MPC8641HPCN spec.
  */
@@ -235,7 +246,8 @@ void set_px_go_with_watchdog(void)
 }
 
 
-int disable_watchdog(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+int pixis_disable_watchdog_cmd(cmd_tbl_t *cmdtp,
+			       int flag, int argc, char *argv[])
 {
 	u8 tmp;
 
@@ -252,7 +264,7 @@ int disable_watchdog(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 }
 
 U_BOOT_CMD(
-	   diswd, 1, 0, disable_watchdog,
+	   diswd, 1, 0, pixis_disable_watchdog_cmd,
 	   "diswd	- Disable watchdog timer \n",
 	   NULL);
 
@@ -263,7 +275,7 @@ U_BOOT_CMD(
  * input: strptr i.e. argv[2]
  */
 
-ulong strfractoint(uchar *strptr)
+static ulong strfractoint(uchar *strptr)
 {
 	int i, j, retval;
 	int mulconst;
@@ -319,3 +331,142 @@ ulong strfractoint(uchar *strptr)
 
 	return retval;
 }
+
+
+int
+pixis_reset_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	ulong val;
+	ulong corepll;
+
+	/*
+	 * No args is a simple reset request.
+	 */
+	if (argc <= 1) {
+		pixis_reset();
+		/* not reached */
+	}
+
+	if (strcmp(argv[1], "cf") == 0) {
+
+		/*
+		 * Reset with frequency changed:
+		 *    cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>
+		 */
+		if (argc < 5) {
+			puts(cmdtp->usage);
+			return 1;
+		}
+
+		read_from_px_regs(0);
+
+		val = set_px_sysclk(simple_strtoul(argv[2], NULL, 10));
+
+		corepll = strfractoint(argv[3]);
+		val = val + set_px_corepll(corepll);
+		val = val + set_px_mpxpll(simple_strtoul(argv[4], NULL, 10));
+		if (val == 3) {
+			puts("Setting registers VCFGEN0 and VCTL\n");
+			read_from_px_regs(1);
+			puts("Resetting board with values from ");
+			puts("VSPEED0, VSPEED1, VCLKH, and VCLKL \n");
+			set_px_go();
+		} else {
+			puts(cmdtp->usage);
+			return 1;
+		}
+
+		while (1) ;	/* Not reached */
+
+	} else if (strcmp(argv[1], "altbank") == 0) {
+
+		/*
+		 * Reset using alternate flash bank:
+		 */
+		if (argv[2] == 0) {
+			/*
+			 * Reset from alternate bank without changing
+			 * frequency and without watchdog timer enabled.
+			 *	altbank
+			 */
+			read_from_px_regs(0);
+			read_from_px_regs_altbank(0);
+			if (argc > 2) {
+				puts(cmdtp->usage);
+				return 1;
+			}
+			puts("Setting registers VCFGNE1, VBOOT, and VCTL\n");
+			set_altbank();
+			read_from_px_regs_altbank(1);
+			puts("Resetting board to boot from the other bank.\n");
+			set_px_go();
+
+		} else if (strcmp(argv[2], "cf") == 0) {
+			/*
+			 * Reset with frequency changed
+			 *    altbank cf <SYSCLK freq> <COREPLL ratio>
+			 *				<MPXPLL ratio>
+			 */
+			read_from_px_regs(0);
+			read_from_px_regs_altbank(0);
+			val = set_px_sysclk(simple_strtoul(argv[3], NULL, 10));
+			corepll = strfractoint(argv[4]);
+			val = val + set_px_corepll(corepll);
+			val = val + set_px_mpxpll(simple_strtoul(argv[5],
+								 NULL, 10));
+			if (val == 3) {
+				puts("Setting registers VCFGEN0, VCFGEN1, VBOOT, and VCTL\n");
+				set_altbank();
+				read_from_px_regs(1);
+				read_from_px_regs_altbank(1);
+				puts("Enabling watchdog timer on the FPGA\n");
+				puts("Resetting board with values from ");
+				puts("VSPEED0, VSPEED1, VCLKH and VCLKL ");
+				puts("to boot from the other bank.\n");
+				set_px_go_with_watchdog();
+			} else {
+				puts(cmdtp->usage);
+				return 1;
+			}
+
+			while (1) ;	/* Not reached */
+
+		} else if (strcmp(argv[2], "wd") == 0) {
+			/*
+			 * Reset from alternate bank without changing
+			 * frequencies but with watchdog timer enabled:
+			 *    altbank wd
+			 */
+			read_from_px_regs(0);
+			read_from_px_regs_altbank(0);
+			puts("Setting registers VCFGEN1, VBOOT, and VCTL\n");
+			set_altbank();
+			read_from_px_regs_altbank(1);
+			puts("Enabling watchdog timer on the FPGA\n");
+			puts("Resetting board to boot from the other bank.\n");
+			set_px_go_with_watchdog();
+			while (1) ;	/* Not reached */
+
+		} else {
+			puts(cmdtp->usage);
+			return 1;
+		}
+
+	} else {
+		puts(cmdtp->usage);
+		return 1;
+	}
+
+	return 0;
+}
+
+
+U_BOOT_CMD(
+	pixis_reset, CFG_MAXARGS, 1, pixis_reset_cmd,
+	"pixis_reset - Reset the board using the FPGA sequencer\n",
+	"    pixis_reset\n"
+	"    pixis_reset [altbank]\n"
+	"    pixis_reset altbank wd\n"
+	"    pixis_reset altbank cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>\n"
+	"    pixis_reset cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>\n"
+	);
diff --git a/board/mpc8641hpcn/pixis.h b/board/freescale/common/pixis.h
index cd9a45d..ff62a62 100644
--- a/board/mpc8641hpcn/pixis.h
+++ b/board/freescale/common/pixis.h
@@ -20,6 +20,7 @@
  * MA 02111-1307 USA
  */
 
+extern void pixis_reset(void);
 extern int set_px_sysclk(ulong sysclk);
 extern int set_px_mpxpll(ulong mpxpll);
 extern int set_px_corepll(ulong corepll);
@@ -28,6 +29,3 @@ extern void read_from_px_regs_altbank(int set);
 extern void set_altbank(void);
 extern void set_px_go(void);
 extern void set_px_go_with_watchdog(void);
-extern int disable_watchdog(cmd_tbl_t *cmdtp,
-			    int flag, int argc, char *argv[]);
-extern ulong strfractoint(uchar *strptr);
diff --git a/board/mpc8641hpcn/Makefile b/board/mpc8641hpcn/Makefile
index 4b68c36..9625211 100644
--- a/board/mpc8641hpcn/Makefile
+++ b/board/mpc8641hpcn/Makefile
@@ -25,7 +25,9 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(BOARD).a
 
-COBJS	:= $(BOARD).o pixis.o sys_eeprom.o
+COBJS	:= $(BOARD).o sys_eeprom.o \
+		../freescale/common/pixis.o
+
 SOBJS	:= init.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/board/mpc8641hpcn/mpc8641hpcn.c b/board/mpc8641hpcn/mpc8641hpcn.c
index b2cf4a9..7d7e2af 100644
--- a/board/mpc8641hpcn/mpc8641hpcn.c
+++ b/board/mpc8641hpcn/mpc8641hpcn.c
@@ -1,9 +1,5 @@
 /*
- * Copyright 2004 Freescale Semiconductor.
- * Jeff Brown
- * Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
- *
- * (C) Copyright 2002 Scott McNutt <smcnutt@artesyncp.com>
+ * Copyright 2006, 2007 Freescale Semiconductor.
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -25,18 +21,18 @@
  */
 
 #include <common.h>
-#include <command.h>
 #include <pci.h>
 #include <asm/processor.h>
 #include <asm/immap_86xx.h>
 #include <spd.h>
+#include <asm/io.h>
 
 #if defined(CONFIG_OF_FLAT_TREE)
 #include <ft_build.h>
 extern void ft_cpu_setup(void *blob, bd_t *bd);
 #endif
 
-#include "pixis.h"
+#include "../freescale/common/pixis.h"
 
 #if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)
 extern void ddr_enable_ecc(unsigned int dram_size);
@@ -258,109 +254,6 @@ ft_board_setup(void *blob, bd_t *bd)
 #endif
 
 
-void
-mpc8641_reset_board(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
-{
-	char cmd;
-	ulong val;
-	ulong corepll;
-
-	/*
-	 * No args is a simple reset request.
-	 */
-	if (argc <= 1) {
-		out8(PIXIS_BASE + PIXIS_RST, 0);
-		/* not reached */
-	}
-
-	cmd = argv[1][1];
-	switch (cmd) {
-	case 'f':		/* reset with frequency changed */
-		if (argc < 5)
-			goto my_usage;
-		read_from_px_regs(0);
-
-		val = set_px_sysclk(simple_strtoul(argv[2], NULL, 10));
-
-		corepll = strfractoint(argv[3]);
-		val = val + set_px_corepll(corepll);
-		val = val + set_px_mpxpll(simple_strtoul(argv[4], NULL, 10));
-		if (val == 3) {
-			puts("Setting registers VCFGEN0 and VCTL\n");
-			read_from_px_regs(1);
-			puts("Resetting board with values from VSPEED0, VSPEED1, VCLKH, and VCLKL ....\n");
-			set_px_go();
-		} else
-			goto my_usage;
-
-		while (1) ;	/* Not reached */
-
-	case 'l':
-		if (argv[2][1] == 'f') {
-			read_from_px_regs(0);
-			read_from_px_regs_altbank(0);
-			/* reset with frequency changed */
-			val = set_px_sysclk(simple_strtoul(argv[3], NULL, 10));
-
-			corepll = strfractoint(argv[4]);
-			val = val + set_px_corepll(corepll);
-			val = val + set_px_mpxpll(simple_strtoul(argv[5],
-								 NULL, 10));
-			if (val == 3) {
-				puts("Setting registers VCFGEN0, VCFGEN1, VBOOT, and VCTL\n");
-				set_altbank();
-				read_from_px_regs(1);
-				read_from_px_regs_altbank(1);
-				puts("Enabling watchdog timer on the FPGA and resetting board with values from VSPEED0, VSPEED1, VCLKH, and VCLKL to boot from the other bank ....\n");
-				set_px_go_with_watchdog();
-			} else
-				goto my_usage;
-
-			while (1) ;	/* Not reached */
-
-		} else if (argv[2][1] == 'd') {
-			/*
-			 * Reset from alternate bank without changing
-			 * frequencies but with watchdog timer enabled.
-			 */
-			read_from_px_regs(0);
-			read_from_px_regs_altbank(0);
-			puts("Setting registers VCFGEN1, VBOOT, and VCTL\n");
-			set_altbank();
-			read_from_px_regs_altbank(1);
-			puts("Enabling watchdog timer on the FPGA and resetting board to boot from the other bank....\n");
-			set_px_go_with_watchdog();
-			while (1) ;	/* Not reached */
-
-		} else {
-			/*
-			 * Reset from next bank without changing
-			 * frequency and without watchdog timer enabled.
-			 */
-			read_from_px_regs(0);
-			read_from_px_regs_altbank(0);
-			if (argc > 2)
-				goto my_usage;
-			puts("Setting registers VCFGNE1, VBOOT, and VCTL\n");
-			set_altbank();
-			read_from_px_regs_altbank(1);
-			puts("Resetting board to boot from the other bank....\n");
-			set_px_go();
-		}
-
-	default:
-		goto my_usage;
-	}
-
-my_usage:
-	puts("\nUsage: reset cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>\n");
-	puts("       reset altbank [cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>]\n");
-	puts("       reset altbank [wd]\n");
-	puts("For example:   reset cf 40 2.5 10\n");
-	puts("See MPC8641HPCN Design Workbook for valid values of command line parameters.\n");
-}
-
-
 /*
  * get_board_sys_clk
  *      Reads the FPGA on board for CONFIG_SYS_CLK_FREQ