From 0db5bca8076998a7516102988ac976a2da28d531 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Mon, 31 Mar 2003 17:27:09 +0000
Subject: * Patch by Martin Winistoerfer, 23 Mar 2003   - Add port to
 MPC555/556 microcontrollers   - Add support for cmi customer board with    
 Intel 28F128J3A, 28F320J3A or 28F640J3A flash.

* Patch by Rick Bronson, 28 Mar 2003:
  - fix common/cmd_nand.c
---
 cpu/mpc5xx/cpu.c | 155 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 155 insertions(+)
 create mode 100644 cpu/mpc5xx/cpu.c

(limited to 'cpu/mpc5xx/cpu.c')

diff --git a/cpu/mpc5xx/cpu.c b/cpu/mpc5xx/cpu.c
new file mode 100644
index 0000000000..6018436a27
--- /dev/null
+++ b/cpu/mpc5xx/cpu.c
@@ -0,0 +1,155 @@
+/*
+ * (C) Copyright 2003
+ * Martin Winistoerfer, martinwinistoerfer@gmx.ch.
+ *
+ * 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, 
+ */
+
+/*
+ * File:		cpu.c
+ * 
+ * Discription:		Some cpu specific function for watchdog, 
+ *                      cpu version test, clock setting ...
+ * 
+ */
+
+
+#include <common.h>
+#include <watchdog.h>
+#include <command.h>
+#include <mpc5xx.h>
+
+
+#if (defined(CONFIG_MPC555))
+#  define	ID_STR	"MPC555/556"
+
+/*
+ * Check version of cpu with Processor Version Register (PVR)
+ */
+static int check_cpu_version (long clock, uint pvr, uint immr)
+{
+    char buf[32];
+	/* The highest 16 bits should be 0x0002 for a MPC555/556 */
+	if ((pvr >> 16) == 0x0002) {
+		printf (" " ID_STR " Version %x", (pvr >> 16));
+		printf (" at %s MHz:", strmhz (buf, clock));
+	} else {
+		printf ("Not supported cpu version");
+		return -1;
+	}
+	return 0;
+}
+#endif /* CONFIG_MPC555 */
+
+
+/*
+ * Check version of mpc5xx
+ */
+int checkcpu (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	ulong clock = gd->cpu_clk;
+	uint immr = get_immr (0);	/* Return full IMMR contents */
+	uint pvr = get_pvr ();		/* Retrieve PVR register */
+
+	puts ("CPU:   ");
+
+	return check_cpu_version (clock, pvr, immr);
+}
+
+/*
+ * Called by macro WATCHDOG_RESET 
+ */
+#if defined(CONFIG_WATCHDOG)
+void watchdog_reset (void)
+{
+	int re_enable = disable_interrupts ();
+
+	reset_5xx_watchdog ((immap_t *) CFG_IMMR);
+	if (re_enable)
+		enable_interrupts ();
+}
+
+/*
+ * Will clear software reset
+ */
+void reset_5xx_watchdog (volatile immap_t * immr)
+{
+	/* Use the MPC5xx Internal Watchdog */
+	immr->im_siu_conf.sc_swsr = 0x556c;	/* Prevent SW time-out */
+	immr->im_siu_conf.sc_swsr = 0xaa39;    
+}
+
+#endif /* CONFIG_WATCHDOG */
+
+
+/*
+ * Get timebase clock frequency
+ */
+unsigned long get_tbclk (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	volatile immap_t *immr = (volatile immap_t *) CFG_IMMR;
+	ulong oscclk, factor;
+
+	if (immr->im_clkrst.car_sccr & SCCR_TBS) {
+		return (gd->cpu_clk / 16);
+	}
+
+	factor = (((CFG_PLPRCR) & PLPRCR_MF_MSK) >> PLPRCR_MF_SHIFT) + 1;
+
+	oscclk = gd->cpu_clk / factor;
+
+	if ((immr->im_clkrst.car_sccr & SCCR_RTSEL) == 0 || factor > 2) {
+		return (oscclk / 4);
+	}
+	return (oscclk / 16);
+}
+
+
+/*
+ * Reset board 
+ */
+int do_reset (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+{
+	ulong addr;
+	
+	/* Interrupts off, enable reset */
+        __asm__ volatile	("  mtspr	81, %r0		\n\t
+				    mfmsr	%r3		\n\t
+				    rlwinm	%r31,%r3,0,25,23\n\t
+				    mtmsr	%r31		\n\t");
+        /*
+         * Trying to execute the next instruction at a non-existing address
+         * should cause a machine check, resulting in reset
+         */
+#ifdef CFG_RESET_ADDRESS
+        addr = CFG_RESET_ADDRESS;
+#else
+        /*
+         * note: when CFG_MONITOR_BASE points to a RAM address, CFG_MONITOR_BASE         * - sizeof (ulong) is usually a valid address. Better pick an address
+         * known to be invalid on your system and assign it to CFG_RESET_ADDRESS.
+         * "(ulong)-1" used to be a good choice for many systems...
+         */
+        addr = CFG_MONITOR_BASE - sizeof (ulong);
+#endif
+	((void (*) (void)) addr) ();
+	return 1;
+}
+
-- 
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