ectool: Add an option to get and use EC ports from /proc/ioports

There are boards that don't use ports 0x62 and 0x66 for EC, e.g. Dell
Latitude E6230 uses 0x930 and 0x934.

Change-Id: Ie3005f5cd6e37206ef187267b0542efdeb26b3af
Signed-off-by: Iru Cai <mytbk920423@gmail.com>
Reviewed-on: https://review.coreboot.org/23430
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

3 files changed, 53 insertions, 13 deletions

diff --git a/util/ectool/ec.c b/util/ectool/ec.c
index 53a53605f6..d6c20001d8 100644
--- a/util/ectool/ec.c
+++ b/util/ectool/ec.c
@@ -16,12 +16,16 @@
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #if !(defined __NetBSD__ || defined __OpenBSD__)
 #include <sys/io.h>
 #endif
 #include "ec.h"
 
+static int ec_data = 0x62;
+static int ec_sc = 0x66;
+
 #if defined __NetBSD__ || defined __OpenBSD__
 #include <machine/sysarch.h>
 static uint8_t inb(unsigned port)
@@ -45,7 +49,7 @@ int send_ec_command(uint8_t command)
 	int timeout;
 
 	timeout = 0x7ff;
-	while ((inb(EC_SC) & EC_IBF) && --timeout) {
+	while ((inb(ec_sc) & EC_IBF) && --timeout) {
 		usleep(10);
 		if ((timeout & 0xff) == 0)
 			debug(".");
@@ -56,7 +60,7 @@ int send_ec_command(uint8_t command)
 		// return -1;
 	}
 
-	outb(command, EC_SC);
+	outb(command, ec_sc);
 	return 0;
 }
 
@@ -65,7 +69,7 @@ int send_ec_data(uint8_t data)
 	int timeout;
 
 	timeout = 0x7ff;
-	while ((inb(EC_SC) & EC_IBF) && --timeout) {	// wait for IBF = 0
+	while ((inb(ec_sc) & EC_IBF) && --timeout) {	// wait for IBF = 0
 		usleep(10);
 		if ((timeout & 0xff) == 0)
 			debug(".");
@@ -75,14 +79,14 @@ int send_ec_data(uint8_t data)
 		// return -1;
 	}
 
-	outb(data, EC_DATA);
+	outb(data, ec_data);
 
 	return 0;
 }
 
 int send_ec_data_nowait(uint8_t data)
 {
-	outb(data, EC_DATA);
+	outb(data, ec_data);
 
 	return 0;
 }
@@ -94,9 +98,9 @@ uint8_t recv_ec_data(void)
 
 	timeout = 0x7fff;
 	while (--timeout) {	// Wait for OBF = 1
-		if (inb(EC_SC) & EC_OBF) {
+		if (inb(ec_sc) & EC_OBF)
 			break;
-		}
+
 		usleep(10);
 		if ((timeout & 0xff) == 0)
 			debug(".");
@@ -106,7 +110,7 @@ uint8_t recv_ec_data(void)
 		// return -1;
 	}
 
-	data = inb(EC_DATA);
+	data = inb(ec_data);
 	debug("recv_ec_data: 0x%02x\n", data);
 
 	return data;
@@ -165,3 +169,32 @@ uint8_t ec_query(void)
 	send_ec_command(QR_EC);
 	return recv_ec_data();
 }
+
+int get_ec_ports(void)
+{
+	FILE *fp = fopen("/proc/ioports", "r");
+	int data = 0, cmd = 0;
+	char line[100];
+
+	if (fp == NULL)
+		return -1;
+
+	while (!feof(fp) && (data == 0 || cmd == 0)) {
+		fgets(line, sizeof(line), fp);
+		if (strstr(line, "EC data") != NULL)
+			data = strtol(line, NULL, 16);
+
+		if (strstr(line, "EC cmd") != NULL)
+			cmd = strtol(line, NULL, 16);
+	}
+
+	fclose(fp);
+	if (data != 0 && cmd != 0) {
+		debug("EC data = 0x%x, EC cmd = 0x%x\n", data, cmd);
+		ec_data = data;
+		ec_sc = cmd;
+	} else {
+		return -1;
+	}
+	return 0;
+}
diff --git a/util/ectool/ec.h b/util/ectool/ec.h
index 4f65f60d99..fd062356d0 100644
--- a/util/ectool/ec.h
+++ b/util/ectool/ec.h
@@ -16,9 +16,6 @@
 #ifndef _EC_H
 #define _EC_H
 
-#define EC_DATA		0x62
-#define EC_SC		0x66
-
 /* EC_SC input */
 #define   EC_SMI_EVT	(1 << 6)	// 1: SMI event pending
 #define   EC_SCI_EVT	(1 << 5)	// 1: SCI event pending
@@ -47,4 +44,5 @@ uint8_t ec_ext_read(uint16_t addr);
 int ec_ext_write(uint16_t addr, uint8_t data);
 uint8_t ec_idx_read(uint16_t addr);
 uint8_t ec_query(void);
+int get_ec_ports(void);
 #endif
diff --git a/util/ectool/ectool.c b/util/ectool/ectool.c
index dcf17288f1..be5a899765 100644
--- a/util/ectool/ectool.c
+++ b/util/ectool/ectool.c
@@ -62,6 +62,7 @@ void print_usage(const char *name)
 	       "   -v | --version:                   print the version\n"
 	       "   -h | --help:                      print this help\n\n"
 	       "   -V | --verbose:                   print debug information\n"
+	       "   -p | --getports:                  get EC data & cmd ports from /proc/ioports\n"
 	       "   -d | --dump:                      print RAM\n"
 	       "   -i | --idx:                       print IDX RAM & RAM\n"
 	       "   -q | --query:                     print query byte\n"
@@ -71,7 +72,7 @@ void print_usage(const char *name)
 	exit(1);
 }
 
-int verbose = 0, dump_idx = 0, dump_ram = 0, dump_query = 0;
+int verbose = 0, dump_idx = 0, dump_ram = 0, dump_query = 0, get_ports = 0;
 
 int main(int argc, char *argv[])
 {
@@ -85,10 +86,11 @@ int main(int argc, char *argv[])
 		{"verbose", 0, 0, 'V'},
 		{"idx", 0, 0, 'i'},
 		{"query", 0, 0, 'q'},
+		{"getports", 0, 0, 'p'},
 		{0, 0, 0, 0}
 	};
 
-	while ((opt = getopt_long(argc, argv, "vh?Vidqw:z:",
+	while ((opt = getopt_long(argc, argv, "vh?Vidqpw:z:",
 				  long_options, &option_index)) != EOF) {
 		switch (opt) {
 		case 'v':
@@ -114,6 +116,9 @@ int main(int argc, char *argv[])
 		case 'q':
 			dump_query = 1;
 			break;
+		case 'p':
+			get_ports = 1;
+			break;
 		case 'h':
 		case '?':
 		default:
@@ -123,6 +128,10 @@ int main(int argc, char *argv[])
 		}
 	}
 
+	if (get_ports && get_ec_ports() != 0)
+		fprintf(stderr, "Cannot get EC ports from /proc/ioports, "
+				"fallback to default.");
+
 	if (iopl(3)) {
 		printf("You need to be root.\n");
 		exit(1);