Change in coreboot[master]: util/pmh7tool: Add option to read specific bit

[Felix Held (Code Review)]

Felix Held has submitted this change and it was merged. ( https://review.coreboot.org/28388 )

Change subject: util/pmh7tool: Add option to read specific bit
......................................................................

util/pmh7tool: Add option to read specific bit

Change-Id: I045383eedbcf438270e9c64329a8d910bb941ab8
Signed-off-by: Evgeny Zinoviev 
Reviewed-on: https://review.coreboot.org/28388
Tested-by: build bot (Jenkins) 
Reviewed-by: Felix Held 
---
M util/pmh7tool/pmh7tool.c
1 file changed, 27 insertions(+), 9 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Felix Held: Looks good to me, approved

diff --git a/util/pmh7tool/pmh7tool.c b/util/pmh7tool/pmh7tool.c
index d0c652e..f03d97e 100644
--- a/util/pmh7tool/pmh7tool.c
+++ b/util/pmh7tool/pmh7tool.c
@@ -53,16 +53,25 @@
    pmh7_register_write(reg, val & ~(1 << bit));
 }

+uint8_t pmh7_register_read_bit(int16_t reg, uint8_t bit)
+{
+	uint8_t val;
+
+	val = pmh7_register_read(reg);
+	return (val >> bit) & 1;
+}
+
 void print_usage(const char *name)
 {
    printf("usage: %s\n", name);
    printf("\n"
-		   "	-h, --help:                 print this help\n"
-		   "	-d, --dump:                 print registers\n"
-		   "	-w, --write <addr> <data>:  write to register\n"
-		   "	-r, --read <addr>:          read from register\n"
-		   "	-c, --clear-bit <addr> <bit>\n"
-		   "	-s, --set-bit <addr> <bit>\n"
+		   "	-h, --help:                   print this help\n"
+		   "	-d, --dump:                   print registers\n"
+		   "	-w, --write <addr> <data>:    write to register\n"
+		   "	-r, --read <addr>:            read from register\n"
+		   "	-b, --read-bit <addr> <bit>   read bit\n"
+		   "	-c, --clear-bit <addr> <bit>  clear bit\n"
+		   "	-s, --set-bit <addr> <bit>    set bit\n"
    	   "\n"
    	   "Attention! Writing to PMH7 registers is very dangerous, as you\n"
    	   "           directly manipulate the power rails, enable lines,\n"
@@ -71,7 +80,7 @@
    	   "\n");
 }

-enum action {HELP, DUMP, WRITE, READ, CLEAR, SET};
+enum action {HELP, DUMP, WRITE, READ, READBIT, CLEAR, SET};

int main(int argc, char *argv[])
 {
@@ -84,6 +93,7 @@
    	{"dump",        0, 0, 'd'},
    	{"write",       1, 0, 'w'},
    	{"read",        1, 0, 'r'},
+		{"read-bit",    1, 0, 'b'},
    	{"clear-bit",   1, 0, 'c'},
    	{"set-bit",     1, 0, 's'},
    	{0, 0, 0, 0}
@@ -94,7 +104,7 @@
    	exit(0);
    }

-	while ((opt = getopt_long(argc, argv, "hdw:r:c:s:",
+	while ((opt = getopt_long(argc, argv, "hdw:r:c:s:b:",
    			  long_options, &option_index)) != EOF) {
    	switch (opt) {
    	case 'd':
@@ -107,6 +117,7 @@
    		break;

case 'w':
+		case 'b':
    	case 'c':
    	case 's':
    		input_addr = strtoul(optarg, NULL, 16);
@@ -125,6 +136,9 @@
    		case 'w':
    			act = WRITE;
    			break;
+			case 'b':
+				act = READBIT;
+				break;
    		case 'c':
    			act = CLEAR;
    			break;
@@ -153,7 +167,7 @@
    	exit(1);
    }

-	if (act == SET || act == CLEAR) {
+	if (act == SET || act == CLEAR || act == READBIT) {
    	if (input_data > 7) {
    		fprintf(stderr,
    			"Error: <bit> cannot be greater than 7.\n");
@@ -198,6 +212,10 @@
    	pmh7_register_write(input_addr, input_data);
    	break;

+	case READBIT:
+		printf("%d\n", pmh7_register_read_bit(input_addr, input_data));
+		break;
+
    case CLEAR:
    	pmh7_register_clear_bit(input_addr, input_data);
    	break;