patch-2.4.22 linux-2.4.22/arch/mips/momentum/ocelot_c/prom.c

• Lines: 152
• Date: 2003-08-25 04:44:40.000000000 -0700
• Orig file: linux-2.4.21/arch/mips/momentum/ocelot_c/prom.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/arch/mips/momentum/ocelot_c/prom.c linux-2.4.22/arch/mips/momentum/ocelot_c/prom.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright 2002 Momentum Computer Inc.
+ * Author: Matthew Dharm <mdharm@momenco.com>
+ *
+ * Based on Ocelot Linux port, which is
+ * 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/mv64340.h>
+
+#include "ocelot_c_fpga.h"
+
+struct callvectors {
+	int	(*open) (char*, int, int);
+	int	(*close) (int);
+	int	(*read) (int, void*, int);
+	int	(*write) (int, void*, int);
+	off_t	(*lseek) (int, off_t, int);
+	int	(*printf) (const char*, ...);
+	void	(*cacheflush) (void);
+	char*	(*gets) (char*);
+};
+
+struct callvectors* debug_vectors;
+char arcs_cmdline[CL_SIZE];
+
+extern unsigned long mv64340_base;
+extern unsigned long cpu_clock;
+
+#ifdef CONFIG_MV64340_ETH
+extern unsigned char prom_mac_addr_base[6];
+#endif
+
+const char *get_system_type(void)
+{
+#ifdef CONFIG_CPU_SR71000
+	return "Momentum Ocelot-CS";
+#else
+	return "Momentum Ocelot-C";
+#endif
+}
+
+#ifdef CONFIG_MV64340_ETH
+static void burn_clocks(void)
+{
+	int i;
+
+	/* this loop should burn at least 1us -- this should be plenty */
+	for (i = 0; i < 0x10000; i++)
+		;
+}
+
+static u8 exchange_bit(u8 val, u8 cs)
+{
+	/* place the data */
+	OCELOT_FPGA_WRITE((val << 2) | cs, EEPROM_MODE);
+	burn_clocks();
+
+	/* turn the clock on */
+	OCELOT_FPGA_WRITE((val << 2) | cs | 0x2, EEPROM_MODE);
+	burn_clocks();
+
+	/* turn the clock off and read-strobe */
+	OCELOT_FPGA_WRITE((val << 2) | cs | 0x10, EEPROM_MODE);
+	
+	/* return the data */
+	return ((OCELOT_FPGA_READ(EEPROM_MODE) >> 3) & 0x1);
+}
+
+void get_mac(char dest[6])
+{
+	u8 read_opcode[12] = {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+	int i,j;
+
+	for (i = 0; i < 12; i++)
+		exchange_bit(read_opcode[i], 1);
+
+	for (j = 0; j < 6; j++) {
+		dest[j] = 0;
+		for (i = 0; i < 8; i++) {
+			dest[j] <<= 1;
+			dest[j] |= exchange_bit(0, 1);
+		}
+	}
+
+	/* turn off CS */
+	exchange_bit(0,0);
+}
+#endif
+
+/* [jsun@junsun.net] PMON passes arguments in C main() style */
+void __init prom_init(int argc, char **arg, char** env, struct callvectors *cv)
+{
+	int i;
+
+	/* save the PROM vectors for debugging use */
+	debug_vectors = cv;
+
+	/* arg[0] is "g", the rest is boot parameters */
+	arcs_cmdline[0] = '\0';
+	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_MOMENCO;
+	mips_machtype = MACH_MOMENCO_OCELOT_C;
+
+	while (*env) {
+		if (strncmp("gtbase", *env, strlen("gtbase")) == 0) {
+			mv64340_base = simple_strtol(*env + strlen("gtbase="),
+							NULL, 16);
+		}
+		if (strncmp("cpuclock", *env, strlen("cpuclock")) == 0) {
+			cpu_clock = simple_strtol(*env + strlen("cpuclock="),
+							NULL, 10);
+		}
+		env++;
+	}
+
+#ifdef CONFIG_MV64340_ETH
+	/* get the base MAC address for on-board ethernet ports */
+	get_mac(prom_mac_addr_base);
+#endif
+
+	debug_vectors->printf("Booting Linux kernel...\n");
+}
+
+void __init prom_free_prom_memory(void)
+{
+}
+
+void __init prom_fixup_mem_map(unsigned long start, unsigned long end)
+{
+}