cros: add cros_ec driver
This patch adds the cros_ec driver that implements the protocol for
communicating with Google's ChromeOS embedded controller.
Signed-off-by: Bernie Thompson <bhthompson@chromium.org>
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Signed-off-by: Che-Liang Chiou <clchiou@chromium.org>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Signed-off-by: Hung-ying Tyan <tyanh@chromium.org>
Signed-off-by: Louis Yung-Chieh Lo <yjlou@chromium.org>
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 5d869b4..1016dde 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -28,6 +28,7 @@
COBJS-$(CONFIG_ALI152X) += ali512x.o
COBJS-$(CONFIG_DS4510) += ds4510.o
COBJS-$(CONFIG_CBMEM_CONSOLE) += cbmem_console.o
+COBJS-$(CONFIG_CROS_EC) += cros_ec.o
COBJS-$(CONFIG_FSL_IIM) += fsl_iim.o
COBJS-$(CONFIG_GPIO_LED) += gpio_led.o
COBJS-$(CONFIG_FSL_MC9SDZ60) += mc9sdz60.o
diff --git a/drivers/misc/cros_ec.c b/drivers/misc/cros_ec.c
new file mode 100644
index 0000000..6e774d9
--- /dev/null
+++ b/drivers/misc/cros_ec.c
@@ -0,0 +1,1304 @@
+/*
+ * Chromium OS cros_ec driver
+ *
+ * Copyright (c) 2012 The Chromium OS Authors.
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * The Matrix Keyboard Protocol driver handles talking to the keyboard
+ * controller chip. Mostly this is for keyboard functions, but some other
+ * things have slipped in, so we provide generic services to talk to the
+ * KBC.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <i2c.h>
+#include <cros_ec.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <spi.h>
+#include <asm/io.h>
+#include <asm-generic/gpio.h>
+
+#ifdef DEBUG_TRACE
+#define debug_trace(fmt, b...) debug(fmt, #b)
+#else
+#define debug_trace(fmt, b...)
+#endif
+
+enum {
+ /* Timeout waiting for a flash erase command to complete */
+ CROS_EC_CMD_TIMEOUT_MS = 5000,
+ /* Timeout waiting for a synchronous hash to be recomputed */
+ CROS_EC_CMD_HASH_TIMEOUT_MS = 2000,
+};
+
+static struct cros_ec_dev static_dev, *last_dev;
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Note: depends on enum ec_current_image */
+static const char * const ec_current_image_name[] = {"unknown", "RO", "RW"};
+
+void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len)
+{
+#ifdef DEBUG
+ int i;
+
+ printf("%s: ", name);
+ if (cmd != -1)
+ printf("cmd=%#x: ", cmd);
+ for (i = 0; i < len; i++)
+ printf("%02x ", data[i]);
+ printf("\n");
+#endif
+}
+
+/*
+ * Calculate a simple 8-bit checksum of a data block
+ *
+ * @param data Data block to checksum
+ * @param size Size of data block in bytes
+ * @return checksum value (0 to 255)
+ */
+int cros_ec_calc_checksum(const uint8_t *data, int size)
+{
+ int csum, i;
+
+ for (i = csum = 0; i < size; i++)
+ csum += data[i];
+ return csum & 0xff;
+}
+
+static int send_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
+ const void *dout, int dout_len,
+ uint8_t **dinp, int din_len)
+{
+ int ret;
+
+ switch (dev->interface) {
+#ifdef CONFIG_CROS_EC_SPI
+ case CROS_EC_IF_SPI:
+ ret = cros_ec_spi_command(dev, cmd, cmd_version,
+ (const uint8_t *)dout, dout_len,
+ dinp, din_len);
+ break;
+#endif
+#ifdef CONFIG_CROS_EC_I2C
+ case CROS_EC_IF_I2C:
+ ret = cros_ec_i2c_command(dev, cmd, cmd_version,
+ (const uint8_t *)dout, dout_len,
+ dinp, din_len);
+ break;
+#endif
+#ifdef CONFIG_CROS_EC_LPC
+ case CROS_EC_IF_LPC:
+ ret = cros_ec_lpc_command(dev, cmd, cmd_version,
+ (const uint8_t *)dout, dout_len,
+ dinp, din_len);
+ break;
+#endif
+ case CROS_EC_IF_NONE:
+ default:
+ ret = -1;
+ }
+
+ return ret;
+}
+
+/**
+ * Send a command to the CROS-EC device and return the reply.
+ *
+ * The device's internal input/output buffers are used.
+ *
+ * @param dev CROS-EC device
+ * @param cmd Command to send (EC_CMD_...)
+ * @param cmd_version Version of command to send (EC_VER_...)
+ * @param dout Output data (may be NULL If dout_len=0)
+ * @param dout_len Size of output data in bytes
+ * @param dinp Response data (may be NULL If din_len=0).
+ * If not NULL, it will be updated to point to the data
+ * and will always be double word aligned (64-bits)
+ * @param din_len Maximum size of response in bytes
+ * @return number of bytes in response, or -1 on error
+ */
+static int ec_command_inptr(struct cros_ec_dev *dev, uint8_t cmd,
+ int cmd_version, const void *dout, int dout_len, uint8_t **dinp,
+ int din_len)
+{
+ uint8_t *din;
+ int len;
+
+ if (cmd_version != 0 && !dev->cmd_version_is_supported) {
+ debug("%s: Command version >0 unsupported\n", __func__);
+ return -1;
+ }
+ len = send_command(dev, cmd, cmd_version, dout, dout_len,
+ &din, din_len);
+
+ /* If the command doesn't complete, wait a while */
+ if (len == -EC_RES_IN_PROGRESS) {
+ struct ec_response_get_comms_status *resp;
+ ulong start;
+
+ /* Wait for command to complete */
+ start = get_timer(0);
+ do {
+ int ret;
+
+ mdelay(50); /* Insert some reasonable delay */
+ ret = send_command(dev, EC_CMD_GET_COMMS_STATUS, 0,
+ NULL, 0,
+ (uint8_t **)&resp, sizeof(*resp));
+ if (ret < 0)
+ return ret;
+
+ if (get_timer(start) > CROS_EC_CMD_TIMEOUT_MS) {
+ debug("%s: Command %#02x timeout\n",
+ __func__, cmd);
+ return -EC_RES_TIMEOUT;
+ }
+ } while (resp->flags & EC_COMMS_STATUS_PROCESSING);
+
+ /* OK it completed, so read the status response */
+ /* not sure why it was 0 for the last argument */
+ len = send_command(dev, EC_CMD_RESEND_RESPONSE, 0,
+ NULL, 0, &din, din_len);
+ }
+
+ debug("%s: len=%d, dinp=%p, *dinp=%p\n", __func__, len, dinp, *dinp);
+ if (dinp) {
+ /* If we have any data to return, it must be 64bit-aligned */
+ assert(len <= 0 || !((uintptr_t)din & 7));
+ *dinp = din;
+ }
+
+ return len;
+}
+
+/**
+ * Send a command to the CROS-EC device and return the reply.
+ *
+ * The device's internal input/output buffers are used.
+ *
+ * @param dev CROS-EC device
+ * @param cmd Command to send (EC_CMD_...)
+ * @param cmd_version Version of command to send (EC_VER_...)
+ * @param dout Output data (may be NULL If dout_len=0)
+ * @param dout_len Size of output data in bytes
+ * @param din Response data (may be NULL If din_len=0).
+ * It not NULL, it is a place for ec_command() to copy the
+ * data to.
+ * @param din_len Maximum size of response in bytes
+ * @return number of bytes in response, or -1 on error
+ */
+static int ec_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
+ const void *dout, int dout_len,
+ void *din, int din_len)
+{
+ uint8_t *in_buffer;
+ int len;
+
+ assert((din_len == 0) || din);
+ len = ec_command_inptr(dev, cmd, cmd_version, dout, dout_len,
+ &in_buffer, din_len);
+ if (len > 0) {
+ /*
+ * If we were asked to put it somewhere, do so, otherwise just
+ * disregard the result.
+ */
+ if (din && in_buffer) {
+ assert(len <= din_len);
+ memmove(din, in_buffer, len);
+ }
+ }
+ return len;
+}
+
+int cros_ec_scan_keyboard(struct cros_ec_dev *dev, struct mbkp_keyscan *scan)
+{
+ if (ec_command(dev, EC_CMD_CROS_EC_STATE, 0, NULL, 0, scan,
+ sizeof(scan->data)) < sizeof(scan->data))
+ return -1;
+
+ return 0;
+}
+
+int cros_ec_read_id(struct cros_ec_dev *dev, char *id, int maxlen)
+{
+ struct ec_response_get_version *r;
+
+ if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
+ (uint8_t **)&r, sizeof(*r)) < sizeof(*r))
+ return -1;
+
+ if (maxlen > sizeof(r->version_string_ro))
+ maxlen = sizeof(r->version_string_ro);
+
+ switch (r->current_image) {
+ case EC_IMAGE_RO:
+ memcpy(id, r->version_string_ro, maxlen);
+ break;
+ case EC_IMAGE_RW:
+ memcpy(id, r->version_string_rw, maxlen);
+ break;
+ default:
+ return -1;
+ }
+
+ id[maxlen - 1] = '\0';
+ return 0;
+}
+
+int cros_ec_read_version(struct cros_ec_dev *dev,
+ struct ec_response_get_version **versionp)
+{
+ if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
+ (uint8_t **)versionp, sizeof(**versionp))
+ < sizeof(**versionp))
+ return -1;
+
+ return 0;
+}
+
+int cros_ec_read_build_info(struct cros_ec_dev *dev, char **strp)
+{
+ if (ec_command_inptr(dev, EC_CMD_GET_BUILD_INFO, 0, NULL, 0,
+ (uint8_t **)strp, EC_HOST_PARAM_SIZE) < 0)
+ return -1;
+
+ return 0;
+}
+
+int cros_ec_read_current_image(struct cros_ec_dev *dev,
+ enum ec_current_image *image)
+{
+ struct ec_response_get_version *r;
+
+ if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
+ (uint8_t **)&r, sizeof(*r)) < sizeof(*r))
+ return -1;
+
+ *image = r->current_image;
+ return 0;
+}
+
+static int cros_ec_wait_on_hash_done(struct cros_ec_dev *dev,
+ struct ec_response_vboot_hash *hash)
+{
+ struct ec_params_vboot_hash p;
+ ulong start;
+
+ start = get_timer(0);
+ while (hash->status == EC_VBOOT_HASH_STATUS_BUSY) {
+ mdelay(50); /* Insert some reasonable delay */
+
+ p.cmd = EC_VBOOT_HASH_GET;
+ if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
+ hash, sizeof(*hash)) < 0)
+ return -1;
+
+ if (get_timer(start) > CROS_EC_CMD_HASH_TIMEOUT_MS) {
+ debug("%s: EC_VBOOT_HASH_GET timeout\n", __func__);
+ return -EC_RES_TIMEOUT;
+ }
+ }
+ return 0;
+}
+
+
+int cros_ec_read_hash(struct cros_ec_dev *dev,
+ struct ec_response_vboot_hash *hash)
+{
+ struct ec_params_vboot_hash p;
+ int rv;
+
+ p.cmd = EC_VBOOT_HASH_GET;
+ if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
+ hash, sizeof(*hash)) < 0)
+ return -1;
+
+ /* If the EC is busy calculating the hash, fidget until it's done. */
+ rv = cros_ec_wait_on_hash_done(dev, hash);
+ if (rv)
+ return rv;
+
+ /* If the hash is valid, we're done. Otherwise, we have to kick it off
+ * again and wait for it to complete. Note that we explicitly assume
+ * that hashing zero bytes is always wrong, even though that would
+ * produce a valid hash value. */
+ if (hash->status == EC_VBOOT_HASH_STATUS_DONE && hash->size)
+ return 0;
+
+ debug("%s: No valid hash (status=%d size=%d). Compute one...\n",
+ __func__, hash->status, hash->size);
+
+ p.cmd = EC_VBOOT_HASH_RECALC;
+ p.hash_type = EC_VBOOT_HASH_TYPE_SHA256;
+ p.nonce_size = 0;
+ p.offset = EC_VBOOT_HASH_OFFSET_RW;
+
+ if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
+ hash, sizeof(*hash)) < 0)
+ return -1;
+
+ rv = cros_ec_wait_on_hash_done(dev, hash);
+ if (rv)
+ return rv;
+
+ debug("%s: hash done\n", __func__);
+
+ return 0;
+}
+
+static int cros_ec_invalidate_hash(struct cros_ec_dev *dev)
+{
+ struct ec_params_vboot_hash p;
+ struct ec_response_vboot_hash *hash;
+
+ /* We don't have an explict command for the EC to discard its current
+ * hash value, so we'll just tell it to calculate one that we know is
+ * wrong (we claim that hashing zero bytes is always invalid).
+ */
+ p.cmd = EC_VBOOT_HASH_RECALC;
+ p.hash_type = EC_VBOOT_HASH_TYPE_SHA256;
+ p.nonce_size = 0;
+ p.offset = 0;
+ p.size = 0;
+
+ debug("%s:\n", __func__);
+
+ if (ec_command_inptr(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
+ (uint8_t **)&hash, sizeof(*hash)) < 0)
+ return -1;
+
+ /* No need to wait for it to finish */
+ return 0;
+}
+
+int cros_ec_reboot(struct cros_ec_dev *dev, enum ec_reboot_cmd cmd,
+ uint8_t flags)
+{
+ struct ec_params_reboot_ec p;
+
+ p.cmd = cmd;
+ p.flags = flags;
+
+ if (ec_command_inptr(dev, EC_CMD_REBOOT_EC, 0, &p, sizeof(p), NULL, 0)
+ < 0)
+ return -1;
+
+ if (!(flags & EC_REBOOT_FLAG_ON_AP_SHUTDOWN)) {
+ /*
+ * EC reboot will take place immediately so delay to allow it
+ * to complete. Note that some reboot types (EC_REBOOT_COLD)
+ * will reboot the AP as well, in which case we won't actually
+ * get to this point.
+ */
+ /*
+ * TODO(rspangler@chromium.org): Would be nice if we had a
+ * better way to determine when the reboot is complete. Could
+ * we poll a memory-mapped LPC value?
+ */
+ udelay(50000);
+ }
+
+ return 0;
+}
+
+int cros_ec_interrupt_pending(struct cros_ec_dev *dev)
+{
+ /* no interrupt support : always poll */
+ if (!fdt_gpio_isvalid(&dev->ec_int))
+ return 1;
+
+ return !gpio_get_value(dev->ec_int.gpio);
+}
+
+int cros_ec_info(struct cros_ec_dev *dev, struct ec_response_cros_ec_info *info)
+{
+ if (ec_command(dev, EC_CMD_CROS_EC_INFO, 0, NULL, 0, info,
+ sizeof(*info)) < sizeof(*info))
+ return -1;
+
+ return 0;
+}
+
+int cros_ec_get_host_events(struct cros_ec_dev *dev, uint32_t *events_ptr)
+{
+ struct ec_response_host_event_mask *resp;
+
+ /*
+ * Use the B copy of the event flags, because the main copy is already
+ * used by ACPI/SMI.
+ */
+ if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_GET_B, 0, NULL, 0,
+ (uint8_t **)&resp, sizeof(*resp)) < sizeof(*resp))
+ return -1;
+
+ if (resp->mask & EC_HOST_EVENT_MASK(EC_HOST_EVENT_INVALID))
+ return -1;
+
+ *events_ptr = resp->mask;
+ return 0;
+}
+
+int cros_ec_clear_host_events(struct cros_ec_dev *dev, uint32_t events)
+{
+ struct ec_params_host_event_mask params;
+
+ params.mask = events;
+
+ /*
+ * Use the B copy of the event flags, so it affects the data returned
+ * by cros_ec_get_host_events().
+ */
+ if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_CLEAR_B, 0,
+ ¶ms, sizeof(params), NULL, 0) < 0)
+ return -1;
+
+ return 0;
+}
+
+int cros_ec_flash_protect(struct cros_ec_dev *dev,
+ uint32_t set_mask, uint32_t set_flags,
+ struct ec_response_flash_protect *resp)
+{
+ struct ec_params_flash_protect params;
+
+ params.mask = set_mask;
+ params.flags = set_flags;
+
+ if (ec_command(dev, EC_CMD_FLASH_PROTECT, EC_VER_FLASH_PROTECT,
+ ¶ms, sizeof(params),
+ resp, sizeof(*resp)) < sizeof(*resp))
+ return -1;
+
+ return 0;
+}
+
+static int cros_ec_check_version(struct cros_ec_dev *dev)
+{
+ struct ec_params_hello req;
+ struct ec_response_hello *resp;
+
+#ifdef CONFIG_CROS_EC_LPC
+ /* LPC has its own way of doing this */
+ if (dev->interface == CROS_EC_IF_LPC)
+ return cros_ec_lpc_check_version(dev);
+#endif
+
+ /*
+ * TODO(sjg@chromium.org).
+ * There is a strange oddity here with the EC. We could just ignore
+ * the response, i.e. pass the last two parameters as NULL and 0.
+ * In this case we won't read back very many bytes from the EC.
+ * On the I2C bus the EC gets upset about this and will try to send
+ * the bytes anyway. This means that we will have to wait for that
+ * to complete before continuing with a new EC command.
+ *
+ * This problem is probably unique to the I2C bus.
+ *
+ * So for now, just read all the data anyway.
+ */
+ dev->cmd_version_is_supported = 1;
+ if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
+ (uint8_t **)&resp, sizeof(*resp)) > 0) {
+ /* It appears to understand new version commands */
+ dev->cmd_version_is_supported = 1;
+ } else {
+ dev->cmd_version_is_supported = 0;
+ if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req,
+ sizeof(req), (uint8_t **)&resp,
+ sizeof(*resp)) < 0) {
+ debug("%s: Failed both old and new command style\n",
+ __func__);
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+int cros_ec_test(struct cros_ec_dev *dev)
+{
+ struct ec_params_hello req;
+ struct ec_response_hello *resp;
+
+ req.in_data = 0x12345678;
+ if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
+ (uint8_t **)&resp, sizeof(*resp)) < sizeof(*resp)) {
+ printf("ec_command_inptr() returned error\n");
+ return -1;
+ }
+ if (resp->out_data != req.in_data + 0x01020304) {
+ printf("Received invalid handshake %x\n", resp->out_data);
+ return -1;
+ }
+
+ return 0;
+}
+
+int cros_ec_flash_offset(struct cros_ec_dev *dev, enum ec_flash_region region,
+ uint32_t *offset, uint32_t *size)
+{
+ struct ec_params_flash_region_info p;
+ struct ec_response_flash_region_info *r;
+ int ret;
+
+ p.region = region;
+ ret = ec_command_inptr(dev, EC_CMD_FLASH_REGION_INFO,
+ EC_VER_FLASH_REGION_INFO,
+ &p, sizeof(p), (uint8_t **)&r, sizeof(*r));
+ if (ret != sizeof(*r))
+ return -1;
+
+ if (offset)
+ *offset = r->offset;
+ if (size)
+ *size = r->size;
+
+ return 0;
+}
+
+int cros_ec_flash_erase(struct cros_ec_dev *dev, uint32_t offset, uint32_t size)
+{
+ struct ec_params_flash_erase p;
+
+ p.offset = offset;
+ p.size = size;
+ return ec_command_inptr(dev, EC_CMD_FLASH_ERASE, 0, &p, sizeof(p),
+ NULL, 0);
+}
+
+/**
+ * Write a single block to the flash
+ *
+ * Write a block of data to the EC flash. The size must not exceed the flash
+ * write block size which you can obtain from cros_ec_flash_write_burst_size().
+ *
+ * The offset starts at 0. You can obtain the region information from
+ * cros_ec_flash_offset() to find out where to write for a particular region.
+ *
+ * Attempting to write to the region where the EC is currently running from
+ * will result in an error.
+ *
+ * @param dev CROS-EC device
+ * @param data Pointer to data buffer to write
+ * @param offset Offset within flash to write to.
+ * @param size Number of bytes to write
+ * @return 0 if ok, -1 on error
+ */
+static int cros_ec_flash_write_block(struct cros_ec_dev *dev,
+ const uint8_t *data, uint32_t offset, uint32_t size)
+{
+ struct ec_params_flash_write p;
+
+ p.offset = offset;
+ p.size = size;
+ assert(data && p.size <= sizeof(p.data));
+ memcpy(p.data, data, p.size);
+
+ return ec_command_inptr(dev, EC_CMD_FLASH_WRITE, 0,
+ &p, sizeof(p), NULL, 0) >= 0 ? 0 : -1;
+}
+
+/**
+ * Return optimal flash write burst size
+ */
+static int cros_ec_flash_write_burst_size(struct cros_ec_dev *dev)
+{
+ struct ec_params_flash_write p;
+ return sizeof(p.data);
+}
+
+/**
+ * Check if a block of data is erased (all 0xff)
+ *
+ * This function is useful when dealing with flash, for checking whether a
+ * data block is erased and thus does not need to be programmed.
+ *
+ * @param data Pointer to data to check (must be word-aligned)
+ * @param size Number of bytes to check (must be word-aligned)
+ * @return 0 if erased, non-zero if any word is not erased
+ */
+static int cros_ec_data_is_erased(const uint32_t *data, int size)
+{
+ assert(!(size & 3));
+ size /= sizeof(uint32_t);
+ for (; size > 0; size -= 4, data++)
+ if (*data != -1U)
+ return 0;
+
+ return 1;
+}
+
+int cros_ec_flash_write(struct cros_ec_dev *dev, const uint8_t *data,
+ uint32_t offset, uint32_t size)
+{
+ uint32_t burst = cros_ec_flash_write_burst_size(dev);
+ uint32_t end, off;
+ int ret;
+
+ /*
+ * TODO: round up to the nearest multiple of write size. Can get away
+ * without that on link right now because its write size is 4 bytes.
+ */
+ end = offset + size;
+ for (off = offset; off < end; off += burst, data += burst) {
+ uint32_t todo;
+
+ /* If the data is empty, there is no point in programming it */
+ todo = min(end - off, burst);
+ if (dev->optimise_flash_write &&
+ cros_ec_data_is_erased((uint32_t *)data, todo))
+ continue;
+
+ ret = cros_ec_flash_write_block(dev, data, off, todo);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * Read a single block from the flash
+ *
+ * Read a block of data from the EC flash. The size must not exceed the flash
+ * write block size which you can obtain from cros_ec_flash_write_burst_size().
+ *
+ * The offset starts at 0. You can obtain the region information from
+ * cros_ec_flash_offset() to find out where to read for a particular region.
+ *
+ * @param dev CROS-EC device
+ * @param data Pointer to data buffer to read into
+ * @param offset Offset within flash to read from
+ * @param size Number of bytes to read
+ * @return 0 if ok, -1 on error
+ */
+static int cros_ec_flash_read_block(struct cros_ec_dev *dev, uint8_t *data,
+ uint32_t offset, uint32_t size)
+{
+ struct ec_params_flash_read p;
+
+ p.offset = offset;
+ p.size = size;
+
+ return ec_command(dev, EC_CMD_FLASH_READ, 0,
+ &p, sizeof(p), data, size) >= 0 ? 0 : -1;
+}
+
+int cros_ec_flash_read(struct cros_ec_dev *dev, uint8_t *data, uint32_t offset,
+ uint32_t size)
+{
+ uint32_t burst = cros_ec_flash_write_burst_size(dev);
+ uint32_t end, off;
+ int ret;
+
+ end = offset + size;
+ for (off = offset; off < end; off += burst, data += burst) {
+ ret = cros_ec_flash_read_block(dev, data, off,
+ min(end - off, burst));
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+int cros_ec_flash_update_rw(struct cros_ec_dev *dev,
+ const uint8_t *image, int image_size)
+{
+ uint32_t rw_offset, rw_size;
+ int ret;
+
+ if (cros_ec_flash_offset(dev, EC_FLASH_REGION_RW, &rw_offset, &rw_size))
+ return -1;
+ if (image_size > rw_size)
+ return -1;
+
+ /* Invalidate the existing hash, just in case the AP reboots
+ * unexpectedly during the update. If that happened, the EC RW firmware
+ * would be invalid, but the EC would still have the original hash.
+ */
+ ret = cros_ec_invalidate_hash(dev);
+ if (ret)
+ return ret;
+
+ /*
+ * Erase the entire RW section, so that the EC doesn't see any garbage
+ * past the new image if it's smaller than the current image.
+ *
+ * TODO: could optimize this to erase just the current image, since
+ * presumably everything past that is 0xff's. But would still need to
+ * round up to the nearest multiple of erase size.
+ */
+ ret = cros_ec_flash_erase(dev, rw_offset, rw_size);
+ if (ret)
+ return ret;
+
+ /* Write the image */
+ ret = cros_ec_flash_write(dev, image, rw_offset, image_size);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+int cros_ec_read_vbnvcontext(struct cros_ec_dev *dev, uint8_t *block)
+{
+ struct ec_params_vbnvcontext p;
+ int len;
+
+ p.op = EC_VBNV_CONTEXT_OP_READ;
+
+ len = ec_command(dev, EC_CMD_VBNV_CONTEXT, EC_VER_VBNV_CONTEXT,
+ &p, sizeof(p), block, EC_VBNV_BLOCK_SIZE);
+ if (len < EC_VBNV_BLOCK_SIZE)
+ return -1;
+
+ return 0;
+}
+
+int cros_ec_write_vbnvcontext(struct cros_ec_dev *dev, const uint8_t *block)
+{
+ struct ec_params_vbnvcontext p;
+ int len;
+
+ p.op = EC_VBNV_CONTEXT_OP_WRITE;
+ memcpy(p.block, block, sizeof(p.block));
+
+ len = ec_command_inptr(dev, EC_CMD_VBNV_CONTEXT, EC_VER_VBNV_CONTEXT,
+ &p, sizeof(p), NULL, 0);
+ if (len < 0)
+ return -1;
+
+ return 0;
+}
+
+int cros_ec_set_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t state)
+{
+ struct ec_params_ldo_set params;
+
+ params.index = index;
+ params.state = state;
+
+ if (ec_command_inptr(dev, EC_CMD_LDO_SET, 0,
+ ¶ms, sizeof(params),
+ NULL, 0))
+ return -1;
+
+ return 0;
+}
+
+int cros_ec_get_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t *state)
+{
+ struct ec_params_ldo_get params;
+ struct ec_response_ldo_get *resp;
+
+ params.index = index;
+
+ if (ec_command_inptr(dev, EC_CMD_LDO_GET, 0,
+ ¶ms, sizeof(params),
+ (uint8_t **)&resp, sizeof(*resp)) < sizeof(*resp))
+ return -1;
+
+ *state = resp->state;
+
+ return 0;
+}
+
+/**
+ * Decode MBKP details from the device tree and allocate a suitable device.
+ *
+ * @param blob Device tree blob
+ * @param node Node to decode from
+ * @param devp Returns a pointer to the new allocated device
+ * @return 0 if ok, -1 on error
+ */
+static int cros_ec_decode_fdt(const void *blob, int node,
+ struct cros_ec_dev **devp)
+{
+ enum fdt_compat_id compat;
+ struct cros_ec_dev *dev;
+ int parent;
+
+ /* See what type of parent we are inside (this is expensive) */
+ parent = fdt_parent_offset(blob, node);
+ if (parent < 0) {
+ debug("%s: Cannot find node parent\n", __func__);
+ return -1;
+ }
+
+ dev = &static_dev;
+ dev->node = node;
+ dev->parent_node = parent;
+
+ compat = fdtdec_lookup(blob, parent);
+ switch (compat) {
+#ifdef CONFIG_CROS_EC_SPI
+ case COMPAT_SAMSUNG_EXYNOS_SPI:
+ dev->interface = CROS_EC_IF_SPI;
+ if (cros_ec_spi_decode_fdt(dev, blob))
+ return -1;
+ break;
+#endif
+#ifdef CONFIG_CROS_EC_I2C
+ case COMPAT_SAMSUNG_S3C2440_I2C:
+ dev->interface = CROS_EC_IF_I2C;
+ if (cros_ec_i2c_decode_fdt(dev, blob))
+ return -1;
+ break;
+#endif
+#ifdef CONFIG_CROS_EC_LPC
+ case COMPAT_INTEL_LPC:
+ dev->interface = CROS_EC_IF_LPC;
+ break;
+#endif
+ default:
+ debug("%s: Unknown compat id %d\n", __func__, compat);
+ return -1;
+ }
+
+ fdtdec_decode_gpio(blob, node, "ec-interrupt", &dev->ec_int);
+ dev->optimise_flash_write = fdtdec_get_bool(blob, node,
+ "optimise-flash-write");
+ *devp = dev;
+
+ return 0;
+}
+
+int cros_ec_init(const void *blob, struct cros_ec_dev **cros_ecp)
+{
+ char id[MSG_BYTES];
+ struct cros_ec_dev *dev;
+ int node = 0;
+
+ *cros_ecp = NULL;
+ do {
+ node = fdtdec_next_compatible(blob, node,
+ COMPAT_GOOGLE_CROS_EC);
+ if (node < 0) {
+ debug("%s: Node not found\n", __func__);
+ return 0;
+ }
+ } while (!fdtdec_get_is_enabled(blob, node));
+
+ if (cros_ec_decode_fdt(blob, node, &dev)) {
+ debug("%s: Failed to decode device.\n", __func__);
+ return -CROS_EC_ERR_FDT_DECODE;
+ }
+
+ switch (dev->interface) {
+#ifdef CONFIG_CROS_EC_SPI
+ case CROS_EC_IF_SPI:
+ if (cros_ec_spi_init(dev, blob)) {
+ debug("%s: Could not setup SPI interface\n", __func__);
+ return -CROS_EC_ERR_DEV_INIT;
+ }
+ break;
+#endif
+#ifdef CONFIG_CROS_EC_I2C
+ case CROS_EC_IF_I2C:
+ if (cros_ec_i2c_init(dev, blob))
+ return -CROS_EC_ERR_DEV_INIT;
+ break;
+#endif
+#ifdef CONFIG_CROS_EC_LPC
+ case CROS_EC_IF_LPC:
+ if (cros_ec_lpc_init(dev, blob))
+ return -CROS_EC_ERR_DEV_INIT;
+ break;
+#endif
+ case CROS_EC_IF_NONE:
+ default:
+ return 0;
+ }
+
+ /* we will poll the EC interrupt line */
+ fdtdec_setup_gpio(&dev->ec_int);
+ if (fdt_gpio_isvalid(&dev->ec_int))
+ gpio_direction_input(dev->ec_int.gpio);
+
+ if (cros_ec_check_version(dev)) {
+ debug("%s: Could not detect CROS-EC version\n", __func__);
+ return -CROS_EC_ERR_CHECK_VERSION;
+ }
+
+ if (cros_ec_read_id(dev, id, sizeof(id))) {
+ debug("%s: Could not read KBC ID\n", __func__);
+ return -CROS_EC_ERR_READ_ID;
+ }
+
+ /* Remember this device for use by the cros_ec command */
+ last_dev = *cros_ecp = dev;
+ debug("Google Chrome EC CROS-EC driver ready, id '%s'\n", id);
+
+ return 0;
+}
+
+#ifdef CONFIG_CMD_CROS_EC
+int cros_ec_decode_region(int argc, char * const argv[])
+{
+ if (argc > 0) {
+ if (0 == strcmp(*argv, "rw"))
+ return EC_FLASH_REGION_RW;
+ else if (0 == strcmp(*argv, "ro"))
+ return EC_FLASH_REGION_RO;
+
+ debug("%s: Invalid region '%s'\n", __func__, *argv);
+ } else {
+ debug("%s: Missing region parameter\n", __func__);
+ }
+
+ return -1;
+}
+
+/**
+ * Perform a flash read or write command
+ *
+ * @param dev CROS-EC device to read/write
+ * @param is_write 1 do to a write, 0 to do a read
+ * @param argc Number of arguments
+ * @param argv Arguments (2 is region, 3 is address)
+ * @return 0 for ok, 1 for a usage error or -ve for ec command error
+ * (negative EC_RES_...)
+ */
+static int do_read_write(struct cros_ec_dev *dev, int is_write, int argc,
+ char * const argv[])
+{
+ uint32_t offset, size = -1U, region_size;
+ unsigned long addr;
+ char *endp;
+ int region;
+ int ret;
+
+ region = cros_ec_decode_region(argc - 2, argv + 2);
+ if (region == -1)
+ return 1;
+ if (argc < 4)
+ return 1;
+ addr = simple_strtoul(argv[3], &endp, 16);
+ if (*argv[3] == 0 || *endp != 0)
+ return 1;
+ if (argc > 4) {
+ size = simple_strtoul(argv[4], &endp, 16);
+ if (*argv[4] == 0 || *endp != 0)
+ return 1;
+ }
+
+ ret = cros_ec_flash_offset(dev, region, &offset, ®ion_size);
+ if (ret) {
+ debug("%s: Could not read region info\n", __func__);
+ return ret;
+ }
+ if (size == -1U)
+ size = region_size;
+
+ ret = is_write ?
+ cros_ec_flash_write(dev, (uint8_t *)addr, offset, size) :
+ cros_ec_flash_read(dev, (uint8_t *)addr, offset, size);
+ if (ret) {
+ debug("%s: Could not %s region\n", __func__,
+ is_write ? "write" : "read");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int do_cros_ec(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ struct cros_ec_dev *dev = last_dev;
+ const char *cmd;
+ int ret = 0;
+
+ if (argc < 2)
+ return CMD_RET_USAGE;
+
+ cmd = argv[1];
+ if (0 == strcmp("init", cmd)) {
+ ret = cros_ec_init(gd->fdt_blob, &dev);
+ if (ret) {
+ printf("Could not init cros_ec device (err %d)\n", ret);
+ return 1;
+ }
+ return 0;
+ }
+
+ /* Just use the last allocated device; there should be only one */
+ if (!last_dev) {
+ printf("No CROS-EC device available\n");
+ return 1;
+ }
+ if (0 == strcmp("id", cmd)) {
+ char id[MSG_BYTES];
+
+ if (cros_ec_read_id(dev, id, sizeof(id))) {
+ debug("%s: Could not read KBC ID\n", __func__);
+ return 1;
+ }
+ printf("%s\n", id);
+ } else if (0 == strcmp("info", cmd)) {
+ struct ec_response_cros_ec_info info;
+
+ if (cros_ec_info(dev, &info)) {
+ debug("%s: Could not read KBC info\n", __func__);
+ return 1;
+ }
+ printf("rows = %u\n", info.rows);
+ printf("cols = %u\n", info.cols);
+ printf("switches = %#x\n", info.switches);
+ } else if (0 == strcmp("curimage", cmd)) {
+ enum ec_current_image image;
+
+ if (cros_ec_read_current_image(dev, &image)) {
+ debug("%s: Could not read KBC image\n", __func__);
+ return 1;
+ }
+ printf("%d\n", image);
+ } else if (0 == strcmp("hash", cmd)) {
+ struct ec_response_vboot_hash hash;
+ int i;
+
+ if (cros_ec_read_hash(dev, &hash)) {
+ debug("%s: Could not read KBC hash\n", __func__);
+ return 1;
+ }
+
+ if (hash.hash_type == EC_VBOOT_HASH_TYPE_SHA256)
+ printf("type: SHA-256\n");
+ else
+ printf("type: %d\n", hash.hash_type);
+
+ printf("offset: 0x%08x\n", hash.offset);
+ printf("size: 0x%08x\n", hash.size);
+
+ printf("digest: ");
+ for (i = 0; i < hash.digest_size; i++)
+ printf("%02x", hash.hash_digest[i]);
+ printf("\n");
+ } else if (0 == strcmp("reboot", cmd)) {
+ int region;
+ enum ec_reboot_cmd cmd;
+
+ if (argc >= 3 && !strcmp(argv[2], "cold"))
+ cmd = EC_REBOOT_COLD;
+ else {
+ region = cros_ec_decode_region(argc - 2, argv + 2);
+ if (region == EC_FLASH_REGION_RO)
+ cmd = EC_REBOOT_JUMP_RO;
+ else if (region == EC_FLASH_REGION_RW)
+ cmd = EC_REBOOT_JUMP_RW;
+ else
+ return CMD_RET_USAGE;
+ }
+
+ if (cros_ec_reboot(dev, cmd, 0)) {
+ debug("%s: Could not reboot KBC\n", __func__);
+ return 1;
+ }
+ } else if (0 == strcmp("events", cmd)) {
+ uint32_t events;
+
+ if (cros_ec_get_host_events(dev, &events)) {
+ debug("%s: Could not read host events\n", __func__);
+ return 1;
+ }
+ printf("0x%08x\n", events);
+ } else if (0 == strcmp("clrevents", cmd)) {
+ uint32_t events = 0x7fffffff;
+
+ if (argc >= 3)
+ events = simple_strtol(argv[2], NULL, 0);
+
+ if (cros_ec_clear_host_events(dev, events)) {
+ debug("%s: Could not clear host events\n", __func__);
+ return 1;
+ }
+ } else if (0 == strcmp("read", cmd)) {
+ ret = do_read_write(dev, 0, argc, argv);
+ if (ret > 0)
+ return CMD_RET_USAGE;
+ } else if (0 == strcmp("write", cmd)) {
+ ret = do_read_write(dev, 1, argc, argv);
+ if (ret > 0)
+ return CMD_RET_USAGE;
+ } else if (0 == strcmp("erase", cmd)) {
+ int region = cros_ec_decode_region(argc - 2, argv + 2);
+ uint32_t offset, size;
+
+ if (region == -1)
+ return CMD_RET_USAGE;
+ if (cros_ec_flash_offset(dev, region, &offset, &size)) {
+ debug("%s: Could not read region info\n", __func__);
+ ret = -1;
+ } else {
+ ret = cros_ec_flash_erase(dev, offset, size);
+ if (ret) {
+ debug("%s: Could not erase region\n",
+ __func__);
+ }
+ }
+ } else if (0 == strcmp("regioninfo", cmd)) {
+ int region = cros_ec_decode_region(argc - 2, argv + 2);
+ uint32_t offset, size;
+
+ if (region == -1)
+ return CMD_RET_USAGE;
+ ret = cros_ec_flash_offset(dev, region, &offset, &size);
+ if (ret) {
+ debug("%s: Could not read region info\n", __func__);
+ } else {
+ printf("Region: %s\n", region == EC_FLASH_REGION_RO ?
+ "RO" : "RW");
+ printf("Offset: %x\n", offset);
+ printf("Size: %x\n", size);
+ }
+ } else if (0 == strcmp("vbnvcontext", cmd)) {
+ uint8_t block[EC_VBNV_BLOCK_SIZE];
+ char buf[3];
+ int i, len;
+ unsigned long result;
+
+ if (argc <= 2) {
+ ret = cros_ec_read_vbnvcontext(dev, block);
+ if (!ret) {
+ printf("vbnv_block: ");
+ for (i = 0; i < EC_VBNV_BLOCK_SIZE; i++)
+ printf("%02x", block[i]);
+ putc('\n');
+ }
+ } else {
+ /*
+ * TODO(clchiou): Move this to a utility function as
+ * cmd_spi might want to call it.
+ */
+ memset(block, 0, EC_VBNV_BLOCK_SIZE);
+ len = strlen(argv[2]);
+ buf[2] = '\0';
+ for (i = 0; i < EC_VBNV_BLOCK_SIZE; i++) {
+ if (i * 2 >= len)
+ break;
+ buf[0] = argv[2][i * 2];
+ if (i * 2 + 1 >= len)
+ buf[1] = '0';
+ else
+ buf[1] = argv[2][i * 2 + 1];
+ strict_strtoul(buf, 16, &result);
+ block[i] = result;
+ }
+ ret = cros_ec_write_vbnvcontext(dev, block);
+ }
+ if (ret) {
+ debug("%s: Could not %s VbNvContext\n", __func__,
+ argc <= 2 ? "read" : "write");
+ }
+ } else if (0 == strcmp("test", cmd)) {
+ int result = cros_ec_test(dev);
+
+ if (result)
+ printf("Test failed with error %d\n", result);
+ else
+ puts("Test passed\n");
+ } else if (0 == strcmp("version", cmd)) {
+ struct ec_response_get_version *p;
+ char *build_string;
+
+ ret = cros_ec_read_version(dev, &p);
+ if (!ret) {
+ /* Print versions */
+ printf("RO version: %1.*s\n",
+ sizeof(p->version_string_ro),
+ p->version_string_ro);
+ printf("RW version: %1.*s\n",
+ sizeof(p->version_string_rw),
+ p->version_string_rw);
+ printf("Firmware copy: %s\n",
+ (p->current_image <
+ ARRAY_SIZE(ec_current_image_name) ?
+ ec_current_image_name[p->current_image] :
+ "?"));
+ ret = cros_ec_read_build_info(dev, &build_string);
+ if (!ret)
+ printf("Build info: %s\n", build_string);
+ }
+ } else if (0 == strcmp("ldo", cmd)) {
+ uint8_t index, state;
+ char *endp;
+
+ if (argc < 3)
+ return CMD_RET_USAGE;
+ index = simple_strtoul(argv[2], &endp, 10);
+ if (*argv[2] == 0 || *endp != 0)
+ return CMD_RET_USAGE;
+ if (argc > 3) {
+ state = simple_strtoul(argv[3], &endp, 10);
+ if (*argv[3] == 0 || *endp != 0)
+ return CMD_RET_USAGE;
+ ret = cros_ec_set_ldo(dev, index, state);
+ } else {
+ ret = cros_ec_get_ldo(dev, index, &state);
+ if (!ret) {
+ printf("LDO%d: %s\n", index,
+ state == EC_LDO_STATE_ON ?
+ "on" : "off");
+ }
+ }
+
+ if (ret) {
+ debug("%s: Could not access LDO%d\n", __func__, index);
+ return ret;
+ }
+ } else {
+ return CMD_RET_USAGE;
+ }
+
+ if (ret < 0) {
+ printf("Error: CROS-EC command failed (error %d)\n", ret);
+ ret = 1;
+ }
+
+ return ret;
+}
+
+U_BOOT_CMD(
+ crosec, 5, 1, do_cros_ec,
+ "CROS-EC utility command",
+ "init Re-init CROS-EC (done on startup automatically)\n"
+ "crosec id Read CROS-EC ID\n"
+ "crosec info Read CROS-EC info\n"
+ "crosec curimage Read CROS-EC current image\n"
+ "crosec hash Read CROS-EC hash\n"
+ "crosec reboot [rw | ro | cold] Reboot CROS-EC\n"
+ "crosec events Read CROS-EC host events\n"
+ "crosec clrevents [mask] Clear CROS-EC host events\n"
+ "crosec regioninfo <ro|rw> Read image info\n"
+ "crosec erase <ro|rw> Erase EC image\n"
+ "crosec read <ro|rw> <addr> [<size>] Read EC image\n"
+ "crosec write <ro|rw> <addr> [<size>] Write EC image\n"
+ "crosec vbnvcontext [hexstring] Read [write] VbNvContext from EC\n"
+ "crosec ldo <idx> [<state>] Switch/Read LDO state\n"
+ "crosec test run tests on cros_ec\n"
+ "crosec version Read CROS-EC version"
+);
+#endif