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authorTim Harvey <tharvey@gateworks.com>2014-06-02 16:13:25 -0700
committerStefano Babic <sbabic@denx.de>2014-06-06 10:07:26 +0200
commit1badf2f47cbbb0e8aab82dfe89a4f85d8f498e5f (patch)
treed0b6ef97d08f9de1c60d434c8057655bc78adf9a /board/gateworks/gw_ventana/eeprom.c
parent5bf497e3fdba14cb39f8752ae7646d77dc49d519 (diff)
imx: ventana: split read_eeprom into standalone file
Split the read_eeprom function out so that it can be shared (ie with SPL) Cc: Stefan Roese <sr@denx.de> Cc: Otavio Salvador <otavio@ossystems.com.br> Cc: Andy Ng <andreas2025@gmail.com> Cc: Eric Nelson <eric.nelson@boundarydevices.com> Cc: Tapani Utriainen <tapani@technexion.com> Cc: Tom Rini <trini@ti.com> Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Diffstat (limited to 'board/gateworks/gw_ventana/eeprom.c')
-rw-r--r--board/gateworks/gw_ventana/eeprom.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/board/gateworks/gw_ventana/eeprom.c b/board/gateworks/gw_ventana/eeprom.c
new file mode 100644
index 0000000000..e90186ebe8
--- /dev/null
+++ b/board/gateworks/gw_ventana/eeprom.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2014 Gateworks Corporation
+ * Author: Tim Harvey <tharvey@gateworks.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <i2c.h>
+
+#include "gsc.h"
+#include "ventana_eeprom.h"
+
+/* read ventana EEPROM, check for validity, and return baseboard type */
+int
+read_eeprom(int bus, struct ventana_board_info *info)
+{
+ int i;
+ int chksum;
+ char baseboard;
+ int type;
+ unsigned char *buf = (unsigned char *)info;
+
+ memset(info, 0, sizeof(*info));
+
+ /*
+ * On a board with a missing/depleted backup battery for GSC, the
+ * board may be ready to probe the GSC before its firmware is
+ * running. We will wait here indefinately for the GSC/EEPROM.
+ */
+ while (1) {
+ if (0 == i2c_set_bus_num(bus) &&
+ 0 == i2c_probe(GSC_EEPROM_ADDR))
+ break;
+ mdelay(1);
+ }
+
+ /* read eeprom config section */
+ if (gsc_i2c_read(GSC_EEPROM_ADDR, 0x00, 1, buf, sizeof(*info))) {
+ puts("EEPROM: Failed to read EEPROM\n");
+ info->model[0] = 0;
+ return GW_UNKNOWN;
+ }
+
+ /* sanity checks */
+ if (info->model[0] != 'G' || info->model[1] != 'W') {
+ puts("EEPROM: Invalid Model in EEPROM\n");
+ info->model[0] = 0;
+ return GW_UNKNOWN;
+ }
+
+ /* validate checksum */
+ for (chksum = 0, i = 0; i < sizeof(*info)-2; i++)
+ chksum += buf[i];
+ if ((info->chksum[0] != chksum>>8) ||
+ (info->chksum[1] != (chksum&0xff))) {
+ puts("EEPROM: Failed EEPROM checksum\n");
+ info->model[0] = 0;
+ return GW_UNKNOWN;
+ }
+
+ /* original GW5400-A prototype */
+ baseboard = info->model[3];
+ if (strncasecmp((const char *)info->model, "GW5400-A", 8) == 0)
+ baseboard = '0';
+
+ switch (baseboard) {
+ case '0': /* original GW5400-A prototype */
+ type = GW54proto;
+ break;
+ case '1':
+ type = GW51xx;
+ break;
+ case '2':
+ type = GW52xx;
+ break;
+ case '3':
+ type = GW53xx;
+ break;
+ case '4':
+ type = GW54xx;
+ break;
+ default:
+ printf("EEPROM: Unknown model in EEPROM: %s\n", info->model);
+ type = GW_UNKNOWN;
+ break;
+ }
+ return type;
+}