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Diffstat (limited to 'arch/nds32/cpu/n1213/ag101/cpu.c')
-rw-r--r--arch/nds32/cpu/n1213/ag101/cpu.c200
1 files changed, 200 insertions, 0 deletions
diff --git a/arch/nds32/cpu/n1213/ag101/cpu.c b/arch/nds32/cpu/n1213/ag101/cpu.c
new file mode 100644
index 000000000..0ab666e8d
--- /dev/null
+++ b/arch/nds32/cpu/n1213/ag101/cpu.c
@@ -0,0 +1,200 @@
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
+ *
+ * Copyright (C) 2011 Andes Technology Corporation
+ * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
+ * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
+ *
+ * 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 specific code */
+#include <common.h>
+#include <command.h>
+#include <watchdog.h>
+#include <asm/cache.h>
+
+#include <faraday/ftwdt010_wdt.h>
+
+/*
+ * cleanup_before_linux() is called just before we call linux
+ * it prepares the processor for linux
+ *
+ * we disable interrupt and caches.
+ */
+int cleanup_before_linux(void)
+{
+#ifdef CONFIG_MMU
+ unsigned long i;
+#endif
+
+ disable_interrupts();
+
+#ifdef CONFIG_MMU
+ /* turn off I/D-cache */
+ icache_disable();
+ dcache_disable();
+
+ /* flush I/D-cache */
+ invalidate_icac();
+ invalidate_dcac();
+#endif
+
+ return 0;
+}
+
+int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ disable_interrupts();
+
+ /*
+ * reset to the base addr of andesboot.
+ * currently no ROM loader at addr 0.
+ * do not use reset_cpu(0);
+ */
+#ifdef CONFIG_FTWDT010_WATCHDOG
+ /*
+ * workaround: if we use CONFIG_HW_WATCHDOG with ftwdt010, will lead
+ * automatic hardware reset when booting Linux.
+ * Please do not use CONFIG_HW_WATCHDOG and WATCHDOG_RESET() here.
+ */
+ ftwdt010_wdt_reset();
+ while (1)
+ ;
+#endif /* CONFIG_FTWDT010_WATCHDOG */
+
+ /*NOTREACHED*/
+}
+
+static inline unsigned long CACHE_LINE_SIZE(enum cache_t cache)
+{
+ if (cache == ICACHE)
+ return 8 << (((GET_ICM_CFG() & ICM_CFG_MSK_ISZ) \
+ >> ICM_CFG_OFF_ISZ) - 1);
+ else
+ return 8 << (((GET_DCM_CFG() & DCM_CFG_MSK_DSZ) \
+ >> DCM_CFG_OFF_DSZ) - 1);
+}
+
+void dcache_flush_range(unsigned long start, unsigned long end)
+{
+ unsigned long line_size;
+
+ line_size = CACHE_LINE_SIZE(DCACHE);
+
+ while (end > start) {
+ __asm__ volatile ("\n\tcctl %0, L1D_VA_WB" : : "r"(start));
+ __asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL" : : "r"(start));
+ start += line_size;
+ }
+}
+
+void icache_inval_range(unsigned long start, unsigned long end)
+{
+ unsigned long line_size;
+
+ line_size = CACHE_LINE_SIZE(ICACHE);
+ while (end > start) {
+ __asm__ volatile ("\n\tcctl %0, L1I_VA_INVAL" : : "r"(start));
+ start += line_size;
+ }
+}
+
+void flush_cache(unsigned long addr, unsigned long size)
+{
+ dcache_flush_range(addr , addr + size);
+ icache_inval_range(addr , addr + size);
+}
+
+void icache_enable(void)
+{
+ __asm__ __volatile__ (
+ "mfsr $p0, $mr8\n\t"
+ "ori $p0, $p0, 0x01\n\t"
+ "mtsr $p0, $mr8\n\t"
+ "isb\n\t"
+ );
+}
+
+void icache_disable(void)
+{
+ __asm__ __volatile__ (
+ "mfsr $p0, $mr8\n\t"
+ "li $p1, ~0x01\n\t"
+ "and $p0, $p0, $p1\n\t"
+ "mtsr $p0, $mr8\n\t"
+ "isb\n\t"
+ );
+}
+
+int icache_status(void)
+{
+ int ret;
+
+ __asm__ __volatile__ (
+ "mfsr $p0, $mr8\n\t"
+ "andi %0, $p0, 0x01\n\t"
+ : "=r" (ret)
+ :
+ : "memory"
+ );
+
+ return ret;
+}
+
+void dcache_enable(void)
+{
+ __asm__ __volatile__ (
+ "mfsr $p0, $mr8\n\t"
+ "ori $p0, $p0, 0x02\n\t"
+ "mtsr $p0, $mr8\n\t"
+ "isb\n\t"
+ );
+}
+
+void dcache_disable(void)
+{
+ __asm__ __volatile__ (
+ "mfsr $p0, $mr8\n\t"
+ "li $p1, ~0x02\n\t"
+ "and $p0, $p0, $p1\n\t"
+ "mtsr $p0, $mr8\n\t"
+ "isb\n\t"
+ );
+}
+
+int dcache_status(void)
+{
+ int ret;
+
+ __asm__ __volatile__ (
+ "mfsr $p0, $mr8\n\t"
+ "andi %0, $p0, 0x02\n\t"
+ : "=r" (ret)
+ :
+ : "memory"
+ );
+
+ return ret;
+}