Initial revision

1 files changed, 239 insertions, 0 deletions

diff --git a/cpu/74xx_7xx/cpu.c b/cpu/74xx_7xx/cpu.c
new file mode 100644
index 00000000000..8a6915fca7b
--- /dev/null
+++ b/cpu/74xx_7xx/cpu.c
@@ -0,0 +1,239 @@
+/*
+ * (C) Copyright 2001
+ * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
+ *
+ * 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
+ */
+
+/*
+ * cpu.c
+ *
+ * CPU specific code
+ *
+ * written or collected and sometimes rewritten by
+ * Magnus Damm <damm@bitsmart.com>
+ *
+ * minor modifications by
+ * Wolfgang Denk <wd@denx.de>
+ *
+ * more modifications by
+ * Josh Huber <huber@mclx.com>
+ * added support for the 74xx series of cpus
+ * added support for the 7xx series of cpus
+ * made the code a little less hard-coded, and more auto-detectish
+ */
+
+#include <common.h>
+#include <command.h>
+#include <74xx_7xx.h>
+#include <asm/cache.h>
+
+cpu_t
+get_cpu_type(void)
+{
+	uint pvr = get_pvr();
+	cpu_t type;
+
+	type = CPU_UNKNOWN;
+
+	switch (PVR_VER(pvr)) {
+	case 0x000c:
+		type = CPU_7400;
+		break;
+	case 0x0008:
+		type = CPU_750;
+
+                if (((pvr >> 8) & 0xff) == 0x01) {
+			type = CPU_750CX;	/* old CX (80100 and 8010x?)*/
+		} else if (((pvr >> 8) & 0xff) == 0x22) {
+			type = CPU_750CX;	/* CX (82201,82202) and CXe (82214) */
+		} else if (((pvr >> 8) & 0xff) == 0x33) {
+			type = CPU_750CX;	/* CXe (83311) */
+		} else if (((pvr >> 12) & 0xF) == 0x3) {
+			type = CPU_755;
+                }
+		break;
+
+	case 0x800C:
+		type = CPU_7410;
+		break;
+
+        case 0x8000:
+		type = CPU_7450;
+		break;
+
+	default:
+		break;
+	}
+
+	return type;
+}
+
+/* ------------------------------------------------------------------------- */
+
+#if !defined(CONFIG_BAB7xx)
+int checkcpu (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	uint type   = get_cpu_type();
+	uint pvr    = get_pvr();
+	ulong clock = gd->cpu_clk;
+	char buf[32];
+	char *str;
+
+	puts ("CPU:   ");
+
+	switch (type) {
+	case CPU_750CX:
+		printf ("750CX%s v%d.%d", (pvr&0xf0)?"e":"",
+			(pvr>>8) & 0xf,
+			pvr & 0xf);
+		goto	PR_CLK;
+
+	case CPU_750:
+		str = "750";
+		break;
+
+	case CPU_755:
+		str = "755";
+		break;
+
+	case CPU_7400:
+		str = "MPC7400";
+		break;
+
+        case CPU_7410:
+                str = "MPC7410";
+		break;
+
+        case CPU_7450:
+                str = "MPC7450";
+		break;
+
+	default:
+                printf("Unknown CPU -- PVR: 0x%08x\n", pvr);
+		return -1;
+	}
+
+	printf ("%s v%d.%d", str, (pvr >> 8) & 0xFF, pvr & 0xFF);
+PR_CLK:
+	printf (" @ %s MHz\n", strmhz(buf, clock));
+
+	return (0);
+}
+#endif
+/* these two functions are unimplemented currently [josh] */
+
+/* ------------------------------------------------------------------------- */
+/* L1 i-cache                                                                */
+
+int
+checkicache(void)
+{
+	return 0; /* XXX */
+}
+
+/* ------------------------------------------------------------------------- */
+/* L1 d-cache                                                                */
+
+int
+checkdcache(void)
+{
+	return 0; /* XXX */
+}
+
+/* ------------------------------------------------------------------------- */
+
+static inline void
+soft_restart(unsigned long addr)
+{
+	/* SRR0 has system reset vector, SRR1 has default MSR value */
+	/* rfi restores MSR from SRR1 and sets the PC to the SRR0 value */
+
+	__asm__ __volatile__ ("mtspr	26, %0"		:: "r" (addr));
+	__asm__ __volatile__ ("li	4, (1 << 6)"	::: "r4");
+	__asm__ __volatile__ ("mtspr	27, 4");
+	__asm__ __volatile__ ("rfi");
+
+	while(1);	/* not reached */
+}
+
+
+#if !defined(CONFIG_PCIPPC2) && \
+    !defined(CONFIG_BAB7xx)  && \
+    !defined(CONFIG_ELPPC)
+/* no generic way to do board reset. simply call soft_reset. */
+void
+do_reset (cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
+{
+    	ulong addr;
+	/* flush and disable I/D cache */
+	__asm__ __volatile__ ("mfspr	3, 1008"	::: "r3");
+	__asm__ __volatile__ ("ori	5, 5, 0xcc00"	::: "r5");
+	__asm__ __volatile__ ("ori	4, 3, 0xc00"	::: "r4");
+	__asm__ __volatile__ ("andc	5, 3, 5"	::: "r5");
+	__asm__ __volatile__ ("sync");
+	__asm__ __volatile__ ("mtspr	1008, 4");
+	__asm__ __volatile__ ("isync");
+	__asm__ __volatile__ ("sync");
+	__asm__ __volatile__ ("mtspr	1008, 5");
+	__asm__ __volatile__ ("isync");
+	__asm__ __volatile__ ("sync");
+
+#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.
+	 */
+	addr = CFG_MONITOR_BASE - sizeof (ulong);
+#endif
+	soft_restart(addr);
+	while(1);	/* not reached */
+}
+#endif
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * For the 7400 the TB clock runs at 1/4 the cpu bus speed.
+ */
+unsigned long
+get_tbclk (void)
+{
+	return CFG_BUS_HZ / 4;
+}
+
+/* ------------------------------------------------------------------------- */
+
+#if defined(CONFIG_WATCHDOG)
+#if !defined(CONFIG_PCIPPC2) && !defined(CONFIG_BAB7xx)
+void
+watchdog_reset(void)
+{
+
+}
+#endif  /* !CONFIG_PCIPPC2 && !CONFIG_BAB7xx */
+#endif	/* CONFIG_WATCHDOG */
+
+/* ------------------------------------------------------------------------- */