Add persistent host storage in EC EEPROM

Signed-off-by: Randall Spangler <rspangler@chromium.org>

BUG=chrome-os-partner:8247
TEST=manual

from root shell on host:
  ectool pstoreinfo   --> should print PstoreSize 1024 AccessSize 4
  echo testing 1 2 3 4 > /tmp/infile
  ectool pstorewrite 8 /tmp/infile
  ectool pstoreread 8 /tmp/outfile
  diff /tmp/infile /tmp/outfile

Change-Id: I565e580307584f7def36c5e53d360c1a897d67d2

3 files changed, 125 insertions, 3 deletions

diff --git a/common/build.mk b/common/build.mk
index 9c4a6fb6d5..34952d410b 100644
--- a/common/build.mk
+++ b/common/build.mk
@@ -14,6 +14,7 @@ common-$(CONFIG_TASK_I8042CMD)+=i8042.o keyboard.o
 common-$(CONFIG_TASK_X86POWER)+=x86_power.o
 common-$(CONFIG_TASK_GAIAPOWER)+=gaia_power.o
 common-$(CONFIG_FLASH)+=flash_commands.o
+common-$(CONFIG_PSTORE)+=pstore_commands.o
 common-$(CONFIG_PWM)+=pwm_commands.o
 common-$(CONFIG_TEMP_SENSOR)+=temp_sensor.o
 common-$(CONFIG_TMP006)+=tmp006.o
diff --git a/common/host_command.c b/common/host_command.c
index 1314a0cfe1..f52c6095ad 100644
--- a/common/host_command.c
+++ b/common/host_command.c
@@ -5,19 +5,20 @@
 
 /* Host command module for Chrome EC */
 
+#include "board.h"
 #include "config.h"
 #include "console.h"
 #include "flash_commands.h"
 #include "host_command.h"
-#include "pwm_commands.h"
-#include "usb_charge_commands.h"
 #include "lpc.h"
 #include "lpc_commands.h"
+#include "pstore_commands.h"
+#include "pwm_commands.h"
 #include "system.h"
 #include "task.h"
 #include "timer.h"
 #include "uart.h"
-#include "registers.h"
+#include "usb_charge_commands.h"
 #include "util.h"
 
 static int host_command[2];
@@ -192,6 +193,17 @@ static void command_process(int slot)
 	case EC_LPC_COMMAND_USB_CHARGE_SET_MODE:
 		lpc_send_host_response(slot, usb_charge_command_set_mode(data));
 		return;
+#ifdef CONFIG_PSTORE
+	case EC_LPC_COMMAND_PSTORE_INFO:
+		lpc_send_host_response(slot, pstore_command_get_info(data));
+		return;
+	case EC_LPC_COMMAND_PSTORE_READ:
+		lpc_send_host_response(slot, pstore_command_read(data));
+		return;
+	case EC_LPC_COMMAND_PSTORE_WRITE:
+		lpc_send_host_response(slot, pstore_command_write(data));
+		return;
+#endif
 	default:
 		lpc_send_host_response(slot, EC_LPC_STATUS_INVALID_COMMAND);
 	}
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;
+}