Merge "Add persistent host storage in EC EEPROM"

1 files changed, 109 insertions, 0 deletions

diff --git a/common/pstore_commands.c b/common/pstore_commands.c
new file mode 100644
index 0000000000..24ce7c7878
--- /dev/null
+++ b/common/pstore_commands.c
@@ -0,0 +1,109 @@
+/* Copyright (c) 2012 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.
+ */
+
+/* Persistent storage commands for Chrome EC */
+
+#include "board.h"
+#include "eeprom.h"
+#include "lpc_commands.h"
+#include "pstore_commands.h"
+#include "uart.h"
+#include "util.h"
+
+/* TODO: move these to board.h */
+#ifdef CONFIG_PSTORE
+/* Start block and block count for host persistent storage in EC EEPROM */
+#define PSTORE_EEPROM_BLOCK_START 16
+#define PSTORE_EEPROM_BLOCK_COUNT 16
+#endif
+
+enum lpc_status pstore_command_get_info(uint8_t *data)
+{
+	struct lpc_response_pstore_info *r =
+			(struct lpc_response_pstore_info *)data;
+
+	uart_printf("ee block size=%d, count=%d\n",
+		    eeprom_get_block_size(), eeprom_get_block_count());
+
+	ASSERT(PSTORE_EEPROM_BLOCK_START + PSTORE_EEPROM_BLOCK_COUNT <=
+	       eeprom_get_block_count());
+
+	r->pstore_size = PSTORE_EEPROM_BLOCK_COUNT * eeprom_get_block_size();
+	r->access_size = sizeof(uint32_t);
+	return EC_LPC_STATUS_SUCCESS;
+}
+
+
+enum lpc_status pstore_command_read(uint8_t *data)
+{
+	struct lpc_params_pstore_read *p =
+			(struct lpc_params_pstore_read *)data;
+	struct lpc_response_pstore_read *r =
+			(struct lpc_response_pstore_read *)data;
+	char *dest = r->data;
+	int block_size = eeprom_get_block_size();
+	int block = p->offset / block_size + PSTORE_EEPROM_BLOCK_COUNT;
+	int offset = p->offset % block_size;
+	int bytes_left = p->size;
+
+	if (p->size > sizeof(r->data))
+		return EC_LPC_STATUS_ERROR;
+
+	while (bytes_left) {
+		/* Read what we can from the current block */
+		int bytes_this = MIN(bytes_left, block_size - offset);
+
+		if (block >=
+		    PSTORE_EEPROM_BLOCK_START + PSTORE_EEPROM_BLOCK_COUNT)
+			return EC_LPC_STATUS_ERROR;
+
+		if (eeprom_read(block, offset, bytes_this, dest))
+			return EC_LPC_STATUS_ERROR;
+
+		/* Continue to the next block if necessary */
+		offset = 0;
+		block++;
+		bytes_left -= bytes_this;
+		dest += bytes_this;
+	}
+
+	return EC_LPC_STATUS_SUCCESS;
+}
+
+
+enum lpc_status pstore_command_write(uint8_t *data)
+{
+	struct lpc_params_pstore_write *p =
+			(struct lpc_params_pstore_write *)data;
+
+	const char *src = p->data;
+	int block_size = eeprom_get_block_size();
+	int block = p->offset / block_size + PSTORE_EEPROM_BLOCK_COUNT;
+	int offset = p->offset % block_size;
+	int bytes_left = p->size;
+
+	if (p->size > sizeof(p->data))
+		return EC_LPC_STATUS_ERROR;
+
+	while (bytes_left) {
+		/* Write what we can to the current block */
+		int bytes_this = MIN(bytes_left, block_size - offset);
+
+		if (block >=
+		    PSTORE_EEPROM_BLOCK_START + PSTORE_EEPROM_BLOCK_COUNT)
+			return EC_LPC_STATUS_ERROR;
+
+		if (eeprom_write(block, offset, bytes_this, src))
+			return EC_LPC_STATUS_ERROR;
+
+		/* Continue to the next block if necessary */
+		offset = 0;
+		block++;
+		bytes_left -= bytes_this;
+		src += bytes_this;
+	}
+
+	return EC_LPC_STATUS_SUCCESS;
+}