[MIPS] Add back support for LASAT platforms

Signed-off-by: Brian Murphy <brian@murphy.dk>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 128 insertions, 0 deletions

diff --git a/arch/mips/lasat/prom.c b/arch/mips/lasat/prom.c
new file mode 100644
index 000000000000..4b80fffcf262
--- /dev/null
+++ b/arch/mips/lasat/prom.c
@@ -0,0 +1,128 @@
+/*
+ * PROM interface routines.
+ */
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/ioport.h>
+#include <asm/bootinfo.h>
+#include <asm/lasat/lasat.h>
+#include <asm/cpu.h>
+
+#include "at93c.h"
+#include <asm/lasat/eeprom.h>
+#include "prom.h"
+
+#define RESET_VECTOR    0xbfc00000
+#define PROM_JUMP_TABLE_ENTRY(n) (*((u32 *)(RESET_VECTOR + 0x20) + n))
+#define PROM_DISPLAY_ADDR       PROM_JUMP_TABLE_ENTRY(0)
+#define PROM_PUTC_ADDR          PROM_JUMP_TABLE_ENTRY(1)
+#define PROM_MONITOR_ADDR       PROM_JUMP_TABLE_ENTRY(2)
+
+static void null_prom_display(const char *string, int pos, int clear)
+{
+}
+
+static void null_prom_monitor(void)
+{
+}
+
+static void null_prom_putc(char c)
+{
+}
+
+/* these are functions provided by the bootloader */
+static void (*__prom_putc)(char c) = null_prom_putc;
+
+void prom_putchar(char c)
+{
+        __prom_putc(c);
+}
+
+void (*prom_display)(const char *string, int pos, int clear) =
+                null_prom_display;
+void (*prom_monitor)(void) = null_prom_monitor;
+
+unsigned int lasat_ndelay_divider;
+
+static void setup_prom_vectors(void)
+{
+        u32 version = *(u32 *)(RESET_VECTOR + 0x90);
+
+        if (version >= 307) {
+                prom_display = (void *)PROM_DISPLAY_ADDR;
+                __prom_putc = (void *)PROM_PUTC_ADDR;
+                prom_monitor = (void *)PROM_MONITOR_ADDR;
+        }
+        printk(KERN_DEBUG "prom vectors set up\n");
+}
+
+static struct at93c_defs at93c_defs[N_MACHTYPES] = {
+        {
+                .reg            = (void *)AT93C_REG_100,
+                .rdata_reg      = (void *)AT93C_RDATA_REG_100,
+                .rdata_shift    = AT93C_RDATA_SHIFT_100,
+                .wdata_shift    = AT93C_WDATA_SHIFT_100,
+                .cs             = AT93C_CS_M_100,
+                .clk            = AT93C_CLK_M_100
+        }, {
+                .reg            = (void *)AT93C_REG_200,
+                .rdata_reg      = (void *)AT93C_RDATA_REG_200,
+                .rdata_shift    = AT93C_RDATA_SHIFT_200,
+                .wdata_shift    = AT93C_WDATA_SHIFT_200,
+                .cs             = AT93C_CS_M_200,
+                .clk            = AT93C_CLK_M_200
+        },
+};
+
+void __init prom_init(void)
+{
+        int argc = fw_arg0;
+        char **argv = (char **) fw_arg1;
+
+        setup_prom_vectors();
+
+        if (current_cpu_data.cputype == CPU_R5000) {
+                printk(KERN_INFO "LASAT 200 board\n");
+                mips_machtype = MACH_LASAT_200;
+                lasat_ndelay_divider = LASAT_200_DIVIDER;
+        } else {
+                printk(KERN_INFO "LASAT 100 board\n");
+                mips_machtype = MACH_LASAT_100;
+                lasat_ndelay_divider = LASAT_100_DIVIDER;
+        }
+
+        at93c = &at93c_defs[mips_machtype];
+
+        lasat_init_board_info();                /* Read info from EEPROM */
+
+        mips_machgroup = MACH_GROUP_LASAT;
+
+        /* Get the command line */
+        if (argc > 0) {
+                strncpy(arcs_cmdline, argv[0], CL_SIZE-1);
+                arcs_cmdline[CL_SIZE-1] = '\0';
+        }
+
+        /* Set the I/O base address */
+        set_io_port_base(KSEG1);
+
+        /* Set memory regions */
+        ioport_resource.start = 0;
+        ioport_resource.end = 0xffffffff;       /* Wrong, fixme.  */
+
+        add_memory_region(0, lasat_board_info.li_memsize, BOOT_MEM_RAM);
+}
+
+void __init prom_free_prom_memory(void)
+{
+}
+
+const char *get_system_type(void)
+{
+        return lasat_board_info.li_bmstr;
+}