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-rw-r--r--cpu/sa1100/cpu.c147
1 files changed, 147 insertions, 0 deletions
diff --git a/cpu/sa1100/cpu.c b/cpu/sa1100/cpu.c
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+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * 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>
+
+int cpu_init (void)
+{
+ /*
+ * setup up stack if necessary
+ */
+#ifdef CONFIG_USE_IRQ
+ IRQ_STACK_START = _armboot_end +
+ CONFIG_STACKSIZE + CONFIG_STACKSIZE_IRQ - 4;
+ FIQ_STACK_START = IRQ_STACK_START + CONFIG_STACKSIZE_FIQ;
+ _armboot_real_end = FIQ_STACK_START + 4;
+#else
+ _armboot_real_end = _armboot_end + CONFIG_STACKSIZE;
+#endif
+ return (0);
+}
+
+int cleanup_before_linux (void)
+{
+ /*
+ * this function is called just before we call linux
+ * it prepares the processor for linux
+ *
+ * just disable everything that can disturb booting linux
+ */
+
+ unsigned long i;
+
+ disable_interrupts ();
+
+ /* turn off I-cache */
+ asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
+ i &= ~0x1000;
+ asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
+
+ /* flush I-cache */
+ asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
+
+ return (0);
+}
+
+int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ extern void reset_cpu (ulong addr);
+
+ printf ("resetting ...\n");
+
+ udelay (50000); /* wait 50 ms */
+ disable_interrupts ();
+ reset_cpu (0);
+
+ /*NOTREACHED*/
+ return (0);
+}
+
+/* taken from blob */
+void icache_enable (void)
+{
+ register u32 i;
+
+ /* read control register */
+ asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
+
+ /* set i-cache */
+ i |= 0x1000;
+
+ /* write back to control register */
+ asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
+}
+
+void icache_disable (void)
+{
+ register u32 i;
+
+ /* read control register */
+ asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
+
+ /* clear i-cache */
+ i &= ~0x1000;
+
+ /* write back to control register */
+ asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
+
+ /* flush i-cache */
+ asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
+}
+
+int icache_status (void)
+{
+ register u32 i;
+
+ /* read control register */
+ asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
+
+ /* return bit */
+ return (i & 0x1000);
+}
+
+/* we will never enable dcache, because we have to setup MMU first */
+void dcache_enable (void)
+{
+ return;
+}
+
+void dcache_disable (void)
+{
+ return;
+}
+
+int dcache_status (void)
+{
+ return 0; /* always off */
+}