drivers/vpd: add framework to search VPD in romstage

Summary:
Added a framework to search VPD in romstage before memory is
avilable. vpd_cbmem.c and vpd_premem.c are added for
code specific for premem environment and for environment that
cbmem can be used.

Since global variable is forbidden in romstage. A CAR_GLOBAL
variable is defined in vpd.c. This variable holds VPD binary
blobs' base address and size from memory mapped flash.

The overall flow is:
* The CAR variable g_vpd_blob is initialized if it was not,
either at romstage (before FSP-M execution in case of FSP UPD
customization), or at ramstage.
* At ramstage, during CBMEM_INIT, the VPD binary blob contents
are copied into CBMEM.
* At vpd_find() which may be called at romstage or at ramstage,
it sets storage for a local struct vpd_blob variable.
  * The variable gets contents duplicated from g_vpd_blob, if
vpd_find() is called at romstage.
  * The variable gets contents obtained from CBMEM, if vpd_find()
is called at ramstage.

Added a call vpd_get_bool(). Given a key/value pair in VPD
binary blob, and name of a bool type variable, set the variable
value if there is a match.
Several checks are in place:
* The key/value length needs to be correct.
* The key name needs to match.
* THe value is either '1' or '0'.

Test Plan:
* Build an OCP MonoLake coreboot image, flash and run.

Tags:
Signed-off-by: Jonathan Zhang <jonzhang@fb.com>
Change-Id: Iebdba59419a555147fc40391cf17cc6879d9e1b2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34634
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>

1 files changed, 86 insertions, 0 deletions

diff --git a/src/drivers/vpd/vpd_cbmem.c b/src/drivers/vpd/vpd_cbmem.c
new file mode 100644
index 0000000000..5b685069aa
--- /dev/null
+++ b/src/drivers/vpd/vpd_cbmem.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <console/console.h>
+#include <cbmem.h>
+#include <fmap.h>
+#include <stdlib.h>
+#include <string.h>
+#include <timestamp.h>
+
+#include "vpd_tables.h"
+#include "vpd.h"
+
+/* Currently we only support Google VPD 2.0, which has a fixed offset. */
+enum {
+	CROSVPD_CBMEM_MAGIC = 0x43524f53,
+	CROSVPD_CBMEM_VERSION = 0x0001,
+};
+
+struct vpd_cbmem {
+	uint32_t magic;
+	uint32_t version;
+	uint32_t ro_size;
+	uint32_t rw_size;
+	uint8_t blob[0];
+	/* The blob contains both RO and RW data. It starts with RO (0 ..
+	 * ro_size) and then RW (ro_size .. ro_size+rw_size).
+	 */
+};
+
+static void cbmem_add_cros_vpd(int is_recovery)
+{
+	struct vpd_cbmem *cbmem;
+	const struct vpd_blob *blob;
+
+	timestamp_add_now(TS_START_COPYVPD);
+
+	blob = vpd_load_blob();
+
+	/* Return if no VPD at all */
+	if (blob->ro_size == 0 && blob->rw_size == 0)
+		return;
+
+	cbmem = cbmem_add(CBMEM_ID_VPD, sizeof(*cbmem) + blob->ro_size +
+		blob->rw_size);
+	if (!cbmem) {
+		printk(BIOS_ERR, "%s: Failed to allocate CBMEM (%u+%u).\n",
+			__func__, blob->ro_size, blob->rw_size);
+		return;
+	}
+
+	cbmem->magic = CROSVPD_CBMEM_MAGIC;
+	cbmem->version = CROSVPD_CBMEM_VERSION;
+	cbmem->ro_size = blob->ro_size;
+	cbmem->rw_size = blob->rw_size;
+
+	if (blob->ro_size) {
+		memcpy(cbmem->blob, blob->ro_base, blob->ro_size);
+		timestamp_add_now(TS_END_COPYVPD_RO);
+	}
+
+	if (blob->rw_size) {
+		memcpy(cbmem->blob + blob->ro_size, blob->rw_base,
+			blob->rw_size);
+		timestamp_add_now(TS_END_COPYVPD_RW);
+	}
+}
+
+void vpd_get_buffers(struct vpd_blob *blob)
+{
+	const struct vpd_cbmem *vpd;
+
+	vpd = cbmem_find(CBMEM_ID_VPD);
+	if (!vpd || !vpd->ro_size)
+		return;
+
+	blob->ro_base = (void *)vpd->blob;
+	blob->ro_size = vpd->ro_size;
+	blob->rw_base = (void *)vpd->blob + vpd->ro_size;
+	blob->rw_size = vpd->rw_size;
+}
+
+RAMSTAGE_CBMEM_INIT_HOOK(cbmem_add_cros_vpd)