1 files changed, 142 insertions, 0 deletions

diff --git a/arch/mips/ddb5xxx/common/prom.c b/arch/mips/ddb5xxx/common/prom.c
new file mode 100644
index 000000000000..b8d1f7489f3b
--- /dev/null
+++ b/arch/mips/ddb5xxx/common/prom.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: jsun@mvista.com or jsun@junsun.net
+ *
+ * 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.
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/bootmem.h>
+
+#include <asm/addrspace.h>
+#include <asm/bootinfo.h>
+#include <asm/ddb5xxx/ddb5xxx.h>
+#include <asm/debug.h>
+
+const char *get_system_type(void)
+{
+        switch (mips_machtype) {
+        case MACH_NEC_DDB5074:          return "NEC DDB Vrc-5074";
+        case MACH_NEC_DDB5476:          return "NEC DDB Vrc-5476";
+        case MACH_NEC_DDB5477:          return "NEC DDB Vrc-5477";
+        case MACH_NEC_ROCKHOPPER:       return "NEC Rockhopper";
+        case MACH_NEC_ROCKHOPPERII:     return "NEC RockhopperII";
+        default:                        return "Unknown NEC board";
+        }
+}
+
+#if defined(CONFIG_DDB5477)
+void ddb5477_runtime_detection(void);
+#endif
+
+/* [jsun@junsun.net] PMON passes arguments in C main() style */
+void __init prom_init(void)
+{
+        int argc = fw_arg0;
+        char **arg = (char**) fw_arg1;
+        int i;
+
+        /* if user passes kernel args, ignore the default one */
+        if (argc > 1)
+                arcs_cmdline[0] = '\0';
+
+        /* arg[0] is "g", the rest is boot parameters */
+        for (i = 1; i < argc; i++) {
+                if (strlen(arcs_cmdline) + strlen(arg[i] + 1)
+                    >= sizeof(arcs_cmdline))
+                        break;
+                strcat(arcs_cmdline, arg[i]);
+                strcat(arcs_cmdline, " ");
+        }
+
+        mips_machgroup = MACH_GROUP_NEC_DDB;
+
+#if defined(CONFIG_DDB5074)
+        mips_machtype = MACH_NEC_DDB5074;
+        add_memory_region(0, DDB_SDRAM_SIZE, BOOT_MEM_RAM);
+#elif defined(CONFIG_DDB5476)
+        mips_machtype = MACH_NEC_DDB5476;
+        add_memory_region(0, DDB_SDRAM_SIZE, BOOT_MEM_RAM);
+#elif defined(CONFIG_DDB5477)
+        ddb5477_runtime_detection();
+        add_memory_region(0, board_ram_size, BOOT_MEM_RAM);
+#endif
+}
+
+unsigned long __init prom_free_prom_memory(void)
+{
+        return 0;
+}
+
+#if defined(CONFIG_DDB5477)
+
+#define DEFAULT_LCS1_BASE 0x19000000
+#define TESTVAL1 'K'
+#define TESTVAL2 'S'
+
+int board_ram_size;
+void ddb5477_runtime_detection(void)
+{
+        volatile char *test_offset;
+        char saved_test_byte;
+
+        /* Determine if this is a DDB5477 board, or a BSB-VR0300
+           base board.  We can tell by checking for the location of
+           the NVRAM.  It lives at the beginning of LCS1 on the DDB5477,
+           and the beginning of LCS1 on the BSB-VR0300 is flash memory.
+           The first 2K of the NVRAM are reserved, so don't we'll poke
+           around just after that.
+         */
+
+        /* We can only use the PCI bus to distinquish between
+           the Rockhopper and RockhopperII backplanes and this must
+           wait until ddb5477_board_init() in setup.c after the 5477
+           is initialized.  So, until then handle
+           both Rockhopper and RockhopperII backplanes as Rockhopper 1
+         */
+
+        test_offset = (char *)KSEG1ADDR(DEFAULT_LCS1_BASE + 0x800);
+        saved_test_byte = *test_offset;
+
+        *test_offset = TESTVAL1;
+        if (*test_offset != TESTVAL1) {
+                /* We couldn't set our test value, so it must not be NVRAM,
+                   so it's a BSB_VR0300 */
+                mips_machtype = MACH_NEC_ROCKHOPPER;
+        } else {
+                /* We may have gotten lucky, and the TESTVAL1 was already
+                   stored at the test location, so we must check a second
+                   test value */
+                *test_offset = TESTVAL2;
+                if (*test_offset != TESTVAL2) {
+                        /* OK, we couldn't set this value either, so it must
+                           definately be a BSB_VR0300 */
+                        mips_machtype = MACH_NEC_ROCKHOPPER;
+                } else {
+                        /* We could change the value twice, so it must be
+                        NVRAM, so it's a DDB_VRC5477 */
+                        mips_machtype = MACH_NEC_DDB5477;
+                }
+        }
+        /* Restore the original byte */
+        *test_offset = saved_test_byte;
+
+        /* before we know a better way, we will trust PMON for getting
+         * RAM size
+         */
+        board_ram_size = 1 << (36 - (ddb_in32(DDB_SDRAM0) & 0xf));
+
+        db_run(printk("DDB run-time detection : %s, %d MB RAM\n",
+                                mips_machtype == MACH_NEC_DDB5477 ?
+                                "DDB5477" : "Rockhopper",
+                                board_ram_size >> 20));
+
+        /* we can't handle ram size > 128 MB */
+        db_assert(board_ram_size <= (128 << 20));
+}
+#endif