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cros_ec: Add support for v3 messages on LPC

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At present version 3 messages are only supported on SPI. Add support for
using LPC as well, as used on samus.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2018-10-01 12:22:39 -06:00
parent a12ef7e26a
commit d07b6e145e
1 changed files with 33 additions and 0 deletions
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33
drivers/misc/cros_ec_lpc.c
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@ -40,6 +40,38 @@ static int wait_for_sync(struct cros_ec_dev *dev)
return 0;
}
int cros_ec_lpc_packet(struct udevice *udev, int out_bytes, int in_bytes)
{
struct cros_ec_dev *dev = dev_get_uclass_priv(udev);
uint8_t *d;
int i;
if (out_bytes > EC_LPC_HOST_PACKET_SIZE)
return log_msg_ret("Cannot send that many bytes\n", -E2BIG);
if (in_bytes > EC_LPC_HOST_PACKET_SIZE)
return log_msg_ret("Cannot receive that many bytes\n", -E2BIG);
if (wait_for_sync(dev))
return log_msg_ret("Timeout waiting ready\n", -ETIMEDOUT);
/* Write data */
for (i = 0, d = (uint8_t *)dev->dout; i < out_bytes; i++, d++)
outb(*d, EC_LPC_ADDR_HOST_PACKET + i);
/* Start the command */
outb(EC_COMMAND_PROTOCOL_3, EC_LPC_ADDR_HOST_CMD);
if (wait_for_sync(dev))
return log_msg_ret("Timeout waiting ready\n", -ETIMEDOUT);
/* Read back args */
for (i = 0, d = dev->din; i < in_bytes; i++, d++)
*d = inb(EC_LPC_ADDR_HOST_PACKET + i);
return in_bytes;
}
int cros_ec_lpc_command(struct udevice *udev, uint8_t cmd, int cmd_version,
const uint8_t *dout, int dout_len,
uint8_t **dinp, int din_len)
@ -200,6 +232,7 @@ static int cros_ec_probe(struct udevice *dev)
}
static struct dm_cros_ec_ops cros_ec_ops = {
.packet = cros_ec_lpc_packet,
.command = cros_ec_lpc_command,
.check_version = cros_ec_lpc_check_version,
};