ft2232_spi: add an ability to use GPIO for chip selection

Change-Id: I6db05619e0d69ad18549c8556ef69225337b1532
Signed-off-by: Sergey Alirzaev <zl29ah@gmail.com>
Reviewed-on: https://review.coreboot.org/28911
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

2 files changed, 26 insertions, 6 deletions

diff --git a/flashrom.8.tmpl b/flashrom.8.tmpl
index 70af395f1..f882dc679 100644
--- a/flashrom.8.tmpl
+++ b/flashrom.8.tmpl
@@ -722,9 +722,9 @@ Olimex ARM-USB-TINY/-H, Olimex ARM-USB-OCD/-H, OpenMoko Neo1973 Debug board (V2+
 Multi-Protocol Adapter (TUMPA), TUMPA Lite, GOEPEL PicoTAP and Google Servo v1/v2.
 .sp
 An optional parameter specifies the controller
-type and channel/interface/port it should support. For that you have to use the
+type, channel/interface/port and GPIO-based chip select it should support. For that you have to use the
 .sp
-.B "  flashrom \-p ft2232_spi:type=model,port=interface"
+.B "  flashrom \-p ft2232_spi:type=model,port=interface,csgpiol=gpio"
 .sp
 syntax where
 .B model
@@ -733,14 +733,17 @@ can be
 arm-usb-tiny ", " arm-usb-tiny-h ", " arm-usb-ocd ", " arm-usb-ocd-h \
 ", " tumpa ", " tumpalite ", " picotap ", " google-servo ", " google-servo-v2 \
 " or " google-servo-v2-legacy
-and
 .B interface
 can be
-.BR A ", " B ", " C ", or " D .
+.BR A ", " B ", " C ", or " D
+and
+.B csgpiol
+can be a number between 0 and 3, denoting GPIOL0-GPIOL3 correspondingly.
 The default model is
 .B 4232H
-and the default interface is
-.BR A .
+the default interface is
+.BR A
+and GPIO is not used by default.
 .sp
 If there is more than one ft2232_spi-compatible device connected, you can select which one should be used by
 specifying its serial number with the
diff --git a/ft2232_spi.c b/ft2232_spi.c
index 819744c3f..95584aa40 100644
--- a/ft2232_spi.c
+++ b/ft2232_spi.c
@@ -327,6 +327,23 @@ int ft2232_spi_init(void)
 	}
 	free(arg);
 
+	arg = extract_programmer_param("csgpiol");
+	if (arg) {
+		char *endptr;
+		unsigned int temp = strtoul(arg, &endptr, 10);
+		if (*endptr || endptr == arg || temp > 3) {
+			msg_perr("Error: Invalid GPIOL specified: \"%s\".\n"
+				 "Valid values are between 0 and 3.\n", arg);
+			free(arg);
+			return -2;
+		} else {
+			unsigned int pin = temp + 4;
+			cs_bits |= 1 << pin;
+			pindir |= 1 << pin;
+		}
+	}
+	free(arg);
+
 	msg_pdbg("Using device type %s %s ",
 		 get_ft2232_vendorname(ft2232_vid, ft2232_type),
 		 get_ft2232_devicename(ft2232_vid, ft2232_type));