Stefan Reinauer submitted this change.

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Add support for reading hardware version

The hardware version of an EM100Pro / EM100Pro-G2 is stored in
the built-in SPI flash of the chip. So far we are making no use
of the hardware version, but in the future this can be used to
differentiate between hardware and protocol differences.

Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Change-Id: I2232d9d6caabf33ae9777d28378c1cdd83da1446
Reviewed-on: https://review.coreboot.org/c/em100/+/36834
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
---
M em100.c
M em100.h
2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/em100.c b/em100.c
index 3d0de42..07099aa 100644
--- a/em100.c
+++ b/em100.c
@@ -196,15 +196,16 @@
 }
 
 /**
- * get_serialno: fetch device's serial number
+ * get_device_info: fetch device's serial number and hardware version
  * @param em100: initialized em100 device structure
  */
-static int get_serialno(struct em100 *em100)
+static int get_device_info(struct em100 *em100)
 {
 	unsigned char data[256];
 	if (read_spi_flash_page(em100, 0x1fff00, data)) {
 		em100->serialno = (data[5] << 24) | (data[4] << 16) | \
 				  (data[3] << 8) | data[2];
+		em100->hwversion = data[1];
 		return 1;
 	}
 	return 0;
@@ -249,7 +250,9 @@
 		printf("Error: Could not write SPI flash.\n");
 		return 0;
 	}
-	get_serialno(em100);
+
+	/* Re-read serial number */
+	get_device_info(em100);
 	if (em100->serialno != 0xffffffff)
 		printf("New serial number: DP%06d\n", em100->serialno);
 	else
@@ -334,8 +337,8 @@
 		return 0;
 	}
 
-	if (!get_serialno(em100)) {
-		printf("Failed to fetch serial number.\n");
+	if (!get_device_info(em100)) {
+		printf("Failed to fetch serial number and hardware version.\n");
 		return 0;
 	}
 
@@ -819,6 +822,7 @@
 		printf("FPGA version: %d.%02d\n", em100.fpga >> 8,
 				em100.fpga & 0xff);
 	}
+	printf("Hardware version: %u\n", em100.hwversion);
 
 	if (em100.serialno != 0xffffffff)
 		printf("Serial number: DP%06d\n", em100.serialno);
diff --git a/em100.h b/em100.h
index a903baa..05a5b24 100644
--- a/em100.h
+++ b/em100.h
@@ -26,6 +26,7 @@
 	uint16_t mcu;
 	uint16_t fpga;
 	uint32_t serialno;
+	uint8_t hwversion;
 };
 
 #define BULK_SEND_TIMEOUT	5000	/* sentinel value */

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