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cros_ec: spi: Add support for EC protocol version 3

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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>
This commit is contained in:
Randall Spangler 2014-02-27 13:26:10 -07:00 committed by Simon Glass
parent 2d8ede58ca
commit a607028331
3 changed files with 49 additions and 0 deletions
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12
drivers/misc/cros_ec.c
View File

@ -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),

24
drivers/misc/cros_ec_spi.c
View File

@ -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.
*

13
include/cros_ec.h
View File

@ -311,6 +311,19 @@ int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
const uint8_t *dout, int dout_len,
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.
*