cros_ec: spi: Add support for EC protocol version 3

Protocol version 3 will be attempted first; if the EC doesn't support
it, u-boot will fall back to the old protocol version (2).

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/misc/cros_ec.c b/drivers/misc/cros_ec.c
index a7716b8..5682d39 100644 (file)
--- a/drivers/misc/cros_ec.c
+++ b/drivers/misc/cros_ec.c
@@ -218,6 +218,11 @@ static int send_command_proto3(struct cros_ec_dev *dev,
                return in_bytes;
 
        switch (dev->interface) {
+#ifdef CONFIG_CROS_EC_SPI
+       case CROS_EC_IF_SPI:
+               rv = cros_ec_spi_packet(dev, out_bytes, in_bytes);
+               break;
+#endif
        case CROS_EC_IF_NONE:
        /* TODO: support protocol 3 for LPC, I2C; for now fall through */
        default:
@@ -665,6 +670,13 @@ static int cros_ec_check_version(struct cros_ec_dev *dev)
         * So for now, just read all the data anyway.
         */
 
+       /* Try sending a version 3 packet */
+       dev->protocol_version = 3;
+       if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
+                            (uint8_t **)&resp, sizeof(*resp)) > 0) {
+               return 0;
+       }
+
        /* Try sending a version 2 packet */
        dev->protocol_version = 2;
        if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),

diff --git a/drivers/misc/cros_ec_spi.c b/drivers/misc/cros_ec_spi.c
index ef73782..7df709c 100644 (file)
--- a/drivers/misc/cros_ec_spi.c
+++ b/drivers/misc/cros_ec_spi.c
@@ -17,6 +17,30 @@
 #include <cros_ec.h>
 #include <spi.h>
 
+int cros_ec_spi_packet(struct cros_ec_dev *dev, int out_bytes, int in_bytes)
+{
+       int rv;
+
+       /* Do the transfer */
+       if (spi_claim_bus(dev->spi)) {
+               debug("%s: Cannot claim SPI bus\n", __func__);
+               return -1;
+       }
+
+       rv = spi_xfer(dev->spi, max(out_bytes, in_bytes) * 8,
+                     dev->dout, dev->din,
+                     SPI_XFER_BEGIN | SPI_XFER_END);
+
+       spi_release_bus(dev->spi);
+
+       if (rv) {
+               debug("%s: Cannot complete SPI transfer\n", __func__);
+               return -1;
+       }
+
+       return in_bytes;
+}
+
 /**
  * Send a command to a LPC CROS_EC device and return the reply.
  *

diff --git a/include/cros_ec.h b/include/cros_ec.h
index 1199d92..84f9104 100644 (file)
--- a/include/cros_ec.h
+++ b/include/cros_ec.h
@@ -312,6 +312,19 @@ int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
                     uint8_t **dinp, int din_len);
 
 /**
+ * Send a packet to a CROS-EC device and return the response packet.
+ *
+ * Expects the request packet to be stored in dev->dout.  Stores the response
+ * packet in dev->din.
+ *
+ * @param dev          CROS-EC device
+ * @param out_bytes    Size of request packet to output
+ * @param in_bytes     Maximum size of response packet to receive
+ * @return number of bytes in response packet, or <0 on error
+ */
+int cros_ec_spi_packet(struct cros_ec_dev *dev, int out_bytes, int in_bytes);
+
+/**
  * Dump a block of data for a command.
  *
  * @param name Name for data (e.g. 'in', 'out')