summaryrefslogtreecommitdiffstats
path: root/arch/mips/basler/excite/excite_prom.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/basler/excite/excite_prom.c')
-rw-r--r--arch/mips/basler/excite/excite_prom.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/arch/mips/basler/excite/excite_prom.c b/arch/mips/basler/excite/excite_prom.c
new file mode 100644
index 00000000000..84724b27075
--- /dev/null
+++ b/arch/mips/basler/excite/excite_prom.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2004, 2005 by Thomas Koeller (thomas.koeller@baslerweb.com)
+ * Based on the PMC-Sierra Yosemite board support by Ralf Baechle and
+ * Manish Lachwani.
+ *
+ * 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 <linux/config.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/smp.h>
+#include <linux/module.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/reboot.h>
+#include <asm/system.h>
+#include <asm/bootinfo.h>
+#include <asm/string.h>
+
+#include <excite.h>
+
+/* This struct is used by Redboot to pass arguments to the kernel */
+typedef struct
+{
+ char *name;
+ char *val;
+} t_env_var;
+
+struct parmblock {
+ t_env_var memsize;
+ t_env_var modetty0;
+ t_env_var ethaddr;
+ t_env_var env_end;
+ char *argv[2];
+ char text[0];
+};
+
+static unsigned int prom_argc;
+static const char ** prom_argv;
+static const t_env_var * prom_env;
+
+static void prom_halt(void) __attribute__((noreturn));
+static void prom_exit(void) __attribute__((noreturn));
+
+
+
+const char *get_system_type(void)
+{
+ return "Basler eXcite";
+}
+
+/*
+ * Halt the system
+ */
+static void prom_halt(void)
+{
+ printk(KERN_NOTICE "\n** System halted.\n");
+ while (1)
+ asm volatile (
+ "\t.set\tmips3\n"
+ "\twait\n"
+ "\t.set\tmips0\n"
+ );
+}
+
+/*
+ * Reset the CPU and re-enter Redboot
+ */
+static void prom_exit(void)
+{
+ unsigned int i;
+ volatile unsigned char * const flg =
+ (volatile unsigned char *) (EXCITE_ADDR_FPGA + EXCITE_FPGA_DPR);
+
+ /* Clear the watchdog reset flag, set the reboot flag */
+ *flg &= ~0x01;
+ *flg |= 0x80;
+
+ for (i = 0; i < 10; i++) {
+ *(volatile unsigned char *) (EXCITE_ADDR_FPGA + EXCITE_FPGA_SYSCTL) = 0x02;
+ iob();
+ mdelay(1000);
+ }
+
+ printk(KERN_NOTICE "Reset failed\n");
+ prom_halt();
+}
+
+static const char __init *prom_getenv(char *name)
+{
+ const t_env_var * p;
+ for (p = prom_env; p->name != NULL; p++)
+ if(strcmp(name, p->name) == 0)
+ break;
+ return p->val;
+}
+
+/*
+ * Init routine which accepts the variables from Redboot
+ */
+void __init prom_init(void)
+{
+ const struct parmblock * const pb = (struct parmblock *) fw_arg2;
+
+ prom_argc = fw_arg0;
+ prom_argv = (const char **) fw_arg1;
+ prom_env = &pb->memsize;
+
+ /* Callbacks for halt, restart */
+ _machine_restart = (void (*)(char *)) prom_exit;
+ _machine_halt = prom_halt;
+
+#ifdef CONFIG_32BIT
+ /* copy command line */
+ strcpy(arcs_cmdline, prom_argv[1]);
+ memsize = simple_strtol(prom_getenv("memsize"), NULL, 16);
+ strcpy(modetty, prom_getenv("modetty0"));
+#endif /* CONFIG_32BIT */
+
+#ifdef CONFIG_64BIT
+# error 64 bit support not implemented
+#endif /* CONFIG_64BIT */
+
+ mips_machgroup = MACH_GROUP_TITAN;
+ mips_machtype = MACH_TITAN_EXCITE;
+}
+
+/* This is called from free_initmem(), so we need to provide it */
+void __init prom_free_prom_memory(void)
+{
+ /* Nothing to do */
+}