From: Dean Luick <dean.luick@xxxxxxxxx>
Add a function to read the platform configuration file from
the EPROM.
Reviewed-by: Easwar Hariharan <easwar.hariharan@xxxxxxxxx>
Signed-off-by: Dean Luick <dean.luick@xxxxxxxxx>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
---
drivers/infiniband/hw/hfi1/eprom.c | 82 ++++++++++++++++++++++++++++++++++++
drivers/infiniband/hw/hfi1/eprom.h | 2 +
2 files changed, 84 insertions(+), 0 deletions(-)
diff --git a/drivers/infiniband/hw/hfi1/eprom.c b/drivers/infiniband/hw/hfi1/eprom.c
index 30ecd94..e70c223 100644
--- a/drivers/infiniband/hw/hfi1/eprom.c
+++ b/drivers/infiniband/hw/hfi1/eprom.c
@@ -203,3 +203,85 @@ int eprom_init(struct hfi1_devdata *dd)
done_asic:
return ret;
}
+
+/* magic character sequence that trails an image */
+#define IMAGE_TRAIL_MAGIC "egamiAPO"
+
+/*
+ * Read all of partition 1. The actual file is at the front. Adjust
+ * the returned size if a trailing image magic is found.
+ */
+static int read_partition_platform_config(struct hfi1_devdata *dd, void **data,
+ u32 *size)
+{
+ void *buffer;
+ void *p;
+ u32 length;
+ int ret;
+
+ buffer = kmalloc(P1_SIZE, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+
+ ret = read_length(dd, P1_START, P1_SIZE, buffer);
+ if (ret) {
+ kfree(buffer);
+ return ret;
+ }
+
+ /* scan for image magic that may trail the actual data */
+ p = strnstr(buffer, IMAGE_TRAIL_MAGIC, P1_SIZE);
+ if (p)
+ length = p - buffer;
+ else
+ length = P1_SIZE;
+
+ *data = buffer;
+ *size = length;
+ return 0;
+}
+
+/*
+ * Read the platform configuration file from the EPROM.
+ *
+ * On success, an allocated buffer containing the data and its size are
+ * returned. It is up to the caller to free this buffer.
+ *
+ * Return value:
+ * 0 - success
+ * -ENXIO - no EPROM is available
+ * -EBUSY - not able to acquire access to the EPROM
+ * -ENOENT - no recognizable file written
+ * -ENOMEM - buffer could not be allocated
+ */
+int eprom_read_platform_config(struct hfi1_devdata *dd, void **data, u32 *size)
+{
+ u32 directory[EP_PAGE_DWORDS]; /* aligned buffer */
+ int ret;
+
+ if (!dd->eprom_available)
+ return -ENXIO;
+
+ ret = acquire_chip_resource(dd, CR_EPROM, EPROM_TIMEOUT);
+ if (ret)
+ return -EBUSY;
+
+ /* read the last page of P0 for the EPROM format magic */
+ ret = read_length(dd, P1_START - EP_PAGE_SIZE, EP_PAGE_SIZE, directory);
+ if (ret)
+ goto done;
+
+ /* last dword of P0 contains a magic indicator */
+ if (directory[EP_PAGE_DWORDS - 1] == 0) {
+ /* partition format */
+ ret = read_partition_platform_config(dd, data, size);
+ goto done;
+ }
+
+ /* nothing recognized */
+ ret = -ENOENT;
+
+done:
+ release_chip_resource(dd, CR_EPROM);
+ return ret;
+}
diff --git a/drivers/infiniband/hw/hfi1/eprom.h b/drivers/infiniband/hw/hfi1/eprom.h
index b7ac9ce..e774184 100644
--- a/drivers/infiniband/hw/hfi1/eprom.h
+++ b/drivers/infiniband/hw/hfi1/eprom.h
@@ -48,3 +48,5 @@
struct hfi1_devdata;
int eprom_init(struct hfi1_devdata *dd);
+int eprom_read_platform_config(struct hfi1_devdata *dd, void **buf_ret,
+ u32 *size_ret);
--
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