Das U-Boot: Universal Boot Loader

diff --git a/cpu/xscale/cpu.c b/cpu/xscale/cpu.c
new file mode 100644 (file)
index 0000000..6a3c24d
--- /dev/null
+++ b/cpu/xscale/cpu.c
@@ -0,0 +1,152 @@
+/*
+ * (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
+        */
+/*
+
+  FIXME: the stack is _below_ the uboot code!!
+
+#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 ("reseting ...\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 */
+}