smc911x_eeprom: new example app for managing newer SMC parts

A forward port of the last version to work with the newer smc911x driver.
I only have a board with a LAN9218 part on it, so that is the only one
I've tested.  But there isn't anything in this that would make it terribly
chip specific afaik.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
CC: Sascha Hauer <s.hauer@pengutronix.de>
CC: Guennadi Liakhovetski <lg@denx.de>
CC: Magnus Lilja <lilja.magnus@gmail.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

examples/.gitignore

@@ -6,5 +6,6 @@
 /timer
 /sched
 /smc91111_eeprom
+/smc911x_eeprom
 *.bin
 *.srec

examples/Makefile

@@ -105,9 +105,10 @@ BIN	+= sched.bin
 endif
 
 ifeq ($(ARCH),blackfin)
-ELF	+= smc91111_eeprom
-SREC	+= smc91111_eeprom.srec
-BIN	+= smc91111_eeprom.bin
+BFIN_BIN = smc91111_eeprom smc911x_eeprom
+ELF	+= $(BFIN_BIN)
+SREC	+= $(addsuffix .srec,$(BFIN_BIN))
+BIN	+= $(addsuffix .bin,$(BFIN_BIN))
 endif
 
 # The following example is pretty 8xx specific...

examples/smc911x_eeprom.c

@@ -0,0 +1,381 @@
+/*
+ * smc911x_eeprom.c - EEPROM interface to SMC911x parts.
+ * Only tested on SMSC9118 though ...
+ *
+ * Copyright 2004-2008 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ *
+ * Based on smc91111_eeprom.c which:
+ * Heavily borrowed from the following peoples GPL'ed software:
+ *  - Wolfgang Denk, DENX Software Engineering, wd@denx.de
+ *       Das U-boot
+ *  - Ladislav Michl ladis@linux-mips.org
+ *       A rejected patch on the U-Boot mailing list
+ */
+
+#include <common.h>
+#include <exports.h>
+
+#ifdef CONFIG_DRIVER_SMC911X
+
+#include "../drivers/net/smc911x.h"
+
+/**
+ *	smsc_ctrlc - detect press of CTRL+C (common ctrlc() isnt exported!?)
+ */
+static int smsc_ctrlc(void)
+{
+	return (tstc() && getc() == 0x03);
+}
+
+/**
+ *	usage - dump usage information
+ */
+static void usage(void)
+{
+	puts(
+		"MAC/EEPROM Commands:\n"
+		" P : Print the MAC addresses\n"
+		" D : Dump the EEPROM contents\n"
+		" M : Dump the MAC contents\n"
+		" C : Copy the MAC address from the EEPROM to the MAC\n"
+		" W : Write a register in the EEPROM or in the MAC\n"
+		" Q : Quit\n"
+		"\n"
+		"Some commands take arguments:\n"
+		" W <E|M> <register> <value>\n"
+		"    E: EEPROM   M: MAC\n"
+	);
+}
+
+/**
+ *	dump_regs - dump the MAC registers
+ *
+ * Registers 0x00 - 0x50 are FIFOs.  The 0x50+ are the control registers
+ * and they're all 32bits long.  0xB8+ are reserved, so don't bother.
+ */
+static void dump_regs(void)
+{
+	u8 i, j = 0;
+	for (i = 0x50; i < 0xB8; i += sizeof(u32))
+		printf("%02x: 0x%08x %c", i, reg_read(CONFIG_DRIVER_SMC911X_BASE + i),
+			(j++ % 2 ? '\n' : ' '));
+}
+
+/**
+ *	do_eeprom_cmd - handle eeprom communication
+ */
+static int do_eeprom_cmd(int cmd, u8 reg)
+{
+	if (reg_read(E2P_CMD) & E2P_CMD_EPC_BUSY) {
+		printf("eeprom_cmd: busy at start (E2P_CMD = 0x%08x)\n",
+			reg_read(E2P_CMD));
+		return -1;
+	}
+
+	reg_write(E2P_CMD, E2P_CMD_EPC_BUSY | cmd | reg);
+
+	while (reg_read(E2P_CMD) & E2P_CMD_EPC_BUSY)
+		if (smsc_ctrlc()) {
+			printf("eeprom_cmd: timeout (E2P_CMD = 0x%08x)\n",
+				reg_read(E2P_CMD));
+			return -1;
+		}
+
+	return 0;
+}
+
+/**
+ *	read_eeprom_reg - read specified register in EEPROM
+ */
+static u8 read_eeprom_reg(u8 reg)
+{
+	int ret = do_eeprom_cmd(E2P_CMD_EPC_CMD_READ, reg);
+	return (ret ? : reg_read(E2P_DATA));
+}
+
+/**
+ *	write_eeprom_reg - write specified value into specified register in EEPROM
+ */
+static int write_eeprom_reg(u8 value, u8 reg)
+{
+	int ret;
+
+	/* enable erasing/writing */
+	ret = do_eeprom_cmd(E2P_CMD_EPC_CMD_EWEN, reg);
+	if (ret)
+		goto done;
+
+	/* erase the eeprom reg */
+	ret = do_eeprom_cmd(E2P_CMD_EPC_CMD_ERASE, reg);
+	if (ret)
+		goto done;
+
+	/* write the eeprom reg */
+	reg_write(E2P_DATA, value);
+	ret = do_eeprom_cmd(E2P_CMD_EPC_CMD_WRITE, reg);
+	if (ret)
+		goto done;
+
+	/* disable erasing/writing */
+	ret = do_eeprom_cmd(E2P_CMD_EPC_CMD_EWDS, reg);
+
+ done:
+	return ret;
+}
+
+/**
+ *	skip_space - find first non-whitespace in given pointer
+ */
+static char *skip_space(char *buf)
+{
+	while (buf[0] == ' ' || buf[0] == '\t')
+		++buf;
+	return buf;
+}
+
+/**
+ *	write_stuff - handle writing of MAC registers / eeprom
+ */
+static void write_stuff(char *line)
+{
+	char dest;
+	char *endp;
+	u8 reg;
+	u32 value;
+
+	/* Skip over the "W " part of the command */
+	line = skip_space(line + 1);
+
+	/* Figure out destination */
+	switch (line[0]) {
+	case 'E':
+	case 'M':
+		dest = line[0];
+		break;
+	default:
+	invalid_usage:
+		printf("ERROR: Invalid write usage\n");
+		usage();
+		return;
+	}
+
+	/* Get the register to write */
+	line = skip_space(line + 1);
+	reg = simple_strtoul(line, &endp, 16);
+	if (line == endp)
+		goto invalid_usage;
+
+	/* Get the value to write */
+	line = skip_space(endp);
+	value = simple_strtoul(line, &endp, 16);
+	if (line == endp)
+		goto invalid_usage;
+
+	/* Check for trailing cruft */
+	line = skip_space(endp);
+	if (line[0])
+		goto invalid_usage;
+
+	/* Finally, execute the command */
+	if (dest == 'E') {
+		printf("Writing EEPROM register %02x with %02x\n", reg, value);
+		write_eeprom_reg(value, reg);
+	} else {
+		printf("Writing MAC register %02x with %08x\n", reg, value);
+		reg_write(CONFIG_DRIVER_SMC911X_BASE + reg, value);
+	}
+}
+
+/**
+ *	copy_from_eeprom - copy MAC address in eeprom to address registers
+ */
+static void copy_from_eeprom(void)
+{
+	ulong addrl =
+		read_eeprom_reg(0x01) |
+		read_eeprom_reg(0x02) << 8 |
+		read_eeprom_reg(0x03) << 16 |
+		read_eeprom_reg(0x04) << 24;
+	ulong addrh =
+		read_eeprom_reg(0x05) |
+		read_eeprom_reg(0x06) << 8;
+	smc911x_set_mac_csr(ADDRL, addrl);
+	smc911x_set_mac_csr(ADDRH, addrh);
+	puts("EEPROM contents copied to MAC\n");
+}
+
+/**
+ *	print_macaddr - print MAC address registers and MAC address in eeprom
+ */
+static void print_macaddr(void)
+{
+	puts("Current MAC Address in MAC:     ");
+	ulong addrl = smc911x_get_mac_csr(ADDRL);
+	ulong addrh = smc911x_get_mac_csr(ADDRH);
+	printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
+		(u8)(addrl), (u8)(addrl >> 8), (u8)(addrl >> 16),
+		(u8)(addrl >> 24), (u8)(addrh), (u8)(addrh >> 8));
+
+	puts("Current MAC Address in EEPROM:  ");
+	int i;
+	for (i = 1; i < 6; ++i)
+		printf("%02x:", read_eeprom_reg(i));
+	printf("%02x\n", read_eeprom_reg(i));
+}
+
+/**
+ *	dump_eeprom - dump the whole content of the EEPROM
+ */
+static void dump_eeprom(void)
+{
+	int i;
+	puts("EEPROM:\n");
+	for (i = 0; i < 7; ++i)
+		printf("%02x: 0x%02x\n", i, read_eeprom_reg(i));
+}
+
+/**
+ *	smc911x_init - get the MAC/EEPROM up and ready for use
+ */
+static int smc911x_init(void)
+{
+	/* See if there is anything there */
+	if (!smc911x_detect_chip())
+		return 1;
+
+	smc911x_reset();
+
+	/* Make sure we set EEDIO/EECLK to the EEPROM */
+	if (reg_read(GPIO_CFG) & GPIO_CFG_EEPR_EN) {
+		while (reg_read(E2P_CMD) & E2P_CMD_EPC_BUSY)
+			if (smsc_ctrlc()) {
+				printf("init: timeout (E2P_CMD = 0x%08x)\n", reg_read(E2P_CMD));
+				return 1;
+			}
+		reg_write(GPIO_CFG, reg_read(GPIO_CFG) & ~GPIO_CFG_EEPR_EN);
+	}
+
+	return 0;
+}
+
+/**
+ *	getline - consume a line of input and handle some escape sequences
+ */
+static char *getline(void)
+{
+	static char buffer[100];
+	char c;
+	size_t i;
+
+	i = 0;
+	while (1) {
+		buffer[i] = '\0';
+		while (!tstc())
+			continue;
+
+		c = getc();
+		/* Convert to uppercase */
+		if (c >= 'a' && c <= 'z')
+			c -= ('a' - 'A');
+
+		switch (c) {
+		case '\r':	/* Enter/Return key */
+		case '\n':
+			puts("\n");
+			return buffer;
+
+		case 0x03:	/* ^C - break */
+			return NULL;
+
+		case 0x5F:
+		case 0x08:	/* ^H  - backspace */
+		case 0x7F:	/* DEL - backspace */
+			if (i) {
+				puts("\b \b");
+				i--;
+			}
+			break;
+
+		default:
+			/* Ignore control characters */
+			if (c < 0x20)
+				break;
+			/* Queue up all other characters */
+			buffer[i++] = c;
+			printf("%c", c);
+			break;
+		}
+	}
+}
+
+/**
+ *	smc911x_eeprom - our application's main() function
+ */
+int smc911x_eeprom(int argc, char *argv[])
+{
+	/* Print the ABI version */
+	app_startup(argv);
+	if (XF_VERSION != get_version()) {
+		printf("Expects ABI version %d\n", XF_VERSION);
+		printf("Actual U-Boot ABI version %lu\n", get_version());
+		printf("Can't run\n\n");
+		return 1;
+	}
+
+	/* Initialize the MAC/EEPROM somewhat */
+	puts("\n");
+	if (smc911x_init())
+		return 1;
+
+	/* Dump helpful usage information */
+	puts("\n");
+	usage();
+	puts("\n");
+
+	while (1) {
+		char *line;
+
+		/* Send the prompt and wait for a line */
+		puts("eeprom> ");
+		line = getline();
+
+		/* Got a ctrl+c */
+		if (!line)
+			return 0;
+
+		/* Eat leading space */
+		line = skip_space(line);
+
+		/* Empty line, try again */
+		if (!line[0])
+			continue;
+
+		/* Only accept 1 letter commands */
+		if (line[0] && line[1] && line[1] != ' ' && line[1] != '\t')
+			goto unknown_cmd;
+
+		/* Now parse the command */
+		switch (line[0]) {
+		case 'W': write_stuff(line);  break;
+		case 'D': dump_eeprom();      break;
+		case 'M': dump_regs();        break;
+		case 'C': copy_from_eeprom(); break;
+		case 'P': print_macaddr();    break;
+		unknown_cmd:
+		default:  puts("ERROR: Unknown command!\n\n");
+		case '?':
+		case 'H': usage();            break;
+		case 'Q': return 0;
+		}
+	}
+}
+
+#else
+int smc911x_eeprom(int argc, char *argv[])
+{
+	puts("Not supported for this board\n");
+	return 1;
+}
+#endif