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Diffstat (limited to 'arch/x86/cpu/sc520/sc520.c')
-rw-r--r--arch/x86/cpu/sc520/sc520.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/x86/cpu/sc520/sc520.c b/arch/x86/cpu/sc520/sc520.c
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+++ b/arch/x86/cpu/sc520/sc520.c
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+/*
+ * (C) Copyright 2008-2011
+ * Graeme Russ, <graeme.russ@gmail.com>
+ *
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/processor-flags.h>
+#include <asm/ic/sc520.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+sc520_mmcr_t *sc520_mmcr = (sc520_mmcr_t *)SC520_MMCR_BASE;
+
+int cpu_init_f(void)
+{
+ if (CONFIG_SYS_SC520_HIGH_SPEED) {
+ /* set it to 133 MHz and write back */
+ writeb(0x02, &sc520_mmcr->cpuctl);
+ gd->cpu_clk = 133000000;
+ } else {
+ /* set it to 100 MHz and write back */
+ writeb(0x01, &sc520_mmcr->cpuctl);
+ gd->cpu_clk = 100000000;
+ }
+
+ /* wait at least one millisecond */
+ asm("movl $0x2000, %%ecx\n"
+ "0: pushl %%ecx\n"
+ "popl %%ecx\n"
+ "loop 0b\n": : : "ecx");
+
+ return x86_cpu_init_f();
+}
+
+int cpu_init_r(void)
+{
+ /* Disable the PAR used for CAR */
+ writel(0x0000000, &sc520_mmcr->par[2]);
+
+ /* turn on the SDRAM write buffer */
+ writeb(0x11, &sc520_mmcr->dbctl);
+
+ return x86_cpu_init_r();
+}
+
+#ifdef CONFIG_SYS_SC520_RESET
+void reset_cpu(ulong addr)
+{
+ printf("Resetting using SC520 MMCR\n");
+ /* Write a '1' to the SYS_RST of the RESCFG MMCR */
+ writeb(0x01, &sc520_mmcr->rescfg);
+
+ /* NOTREACHED */
+}
+#endif