+// SPDX-License-Identifier: GPL-2.0+
/*
* Chromium OS cros_ec driver - SPI interface
*
* 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
*/
/*
#include <common.h>
#include <cros_ec.h>
+#include <dm.h>
+#include <errno.h>
+#include <log.h>
#include <spi.h>
+int cros_ec_spi_packet(struct udevice *udev, int out_bytes, int in_bytes)
+{
+ struct cros_ec_dev *dev = dev_get_uclass_priv(udev);
+ struct spi_slave *slave = dev_get_parent_priv(dev->dev);
+ ulong start;
+ uint8_t byte;
+ int rv;
+
+ /* Do the transfer */
+ if (spi_claim_bus(slave)) {
+ debug("%s: Cannot claim SPI bus\n", __func__);
+ return -1;
+ }
+
+ rv = spi_xfer(slave, out_bytes * 8, dev->dout, NULL, SPI_XFER_BEGIN);
+ if (rv)
+ goto done;
+ start = get_timer(0);
+ while (1) {
+ rv = spi_xfer(slave, 8, NULL, &byte, 0);
+ if (byte == SPI_PREAMBLE_END_BYTE)
+ break;
+ if (rv)
+ goto done;
+ if (get_timer(start) > 100) {
+ rv = -ETIMEDOUT;
+ goto done;
+ }
+ }
+
+ rv = spi_xfer(slave, in_bytes * 8, NULL, dev->din, 0);
+done:
+ spi_xfer(slave, 0, NULL, NULL, SPI_XFER_END);
+ spi_release_bus(slave);
+
+ 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.
*
* @param din_len Maximum size of response in bytes
* @return number of bytes in response, or -1 on error
*/
-int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
+int cros_ec_spi_command(struct udevice *udev, uint8_t cmd, int cmd_version,
const uint8_t *dout, int dout_len,
uint8_t **dinp, int din_len)
{
+ struct cros_ec_dev *dev = dev_get_uclass_priv(udev);
+ struct spi_slave *slave = dev_get_parent_priv(dev->dev);
int in_bytes = din_len + 4; /* status, length, checksum, trailer */
uint8_t *out;
uint8_t *p;
int csum, len;
int rv;
+ if (dev->protocol_version != 2) {
+ debug("%s: Unsupported EC protcol version %d\n",
+ __func__, dev->protocol_version);
+ return -1;
+ }
+
/*
* Sanity-check input size to make sure it plus transaction overhead
* fits in the internal device buffer.
*/
memset(dev->din, '\0', in_bytes);
- if (spi_claim_bus(dev->spi)) {
+ if (spi_claim_bus(slave)) {
debug("%s: Cannot claim SPI bus\n", __func__);
return -1;
}
out = dev->dout;
- out[0] = cmd_version;
+ out[0] = EC_CMD_VERSION0 + cmd_version;
out[1] = cmd;
out[2] = (uint8_t)dout_len;
memcpy(out + 3, dout, dout_len);
p = dev->din + sizeof(int64_t) - 2;
len = dout_len + 4;
cros_ec_dump_data("out", cmd, out, len);
- rv = spi_xfer(dev->spi, max(len, in_bytes) * 8, out, p,
+ rv = spi_xfer(slave, max(len, in_bytes) * 8, out, p,
SPI_XFER_BEGIN | SPI_XFER_END);
- spi_release_bus(dev->spi);
+ spi_release_bus(slave);
if (rv) {
debug("%s: Cannot complete SPI transfer\n", __func__);
return -1;
}
- len = min(p[1], din_len);
+ len = min((int)p[1], din_len);
cros_ec_dump_data("in", -1, p, len + 3);
/* Response code is first byte of message */
return len;
}
-int cros_ec_spi_decode_fdt(struct cros_ec_dev *dev, const void *blob)
+static int cros_ec_probe(struct udevice *dev)
{
- /* Decode interface-specific FDT params */
- dev->max_frequency = fdtdec_get_int(blob, dev->node,
- "spi-max-frequency", 500000);
- dev->cs = fdtdec_get_int(blob, dev->node, "reg", 0);
-
- return 0;
+ return cros_ec_register(dev);
}
-/**
- * Initialize SPI protocol.
- *
- * @param dev CROS_EC device
- * @param blob Device tree blob
- * @return 0 if ok, -1 on error
- */
-int cros_ec_spi_init(struct cros_ec_dev *dev, const void *blob)
-{
- dev->spi = spi_setup_slave_fdt(blob, dev->parent_node,
- dev->cs, dev->max_frequency, 0);
- if (!dev->spi) {
- debug("%s: Could not setup SPI slave\n", __func__);
- return -1;
- }
-
- return 0;
-}
+static struct dm_cros_ec_ops cros_ec_ops = {
+ .packet = cros_ec_spi_packet,
+ .command = cros_ec_spi_command,
+};
+
+static const struct udevice_id cros_ec_ids[] = {
+ { .compatible = "google,cros-ec-spi" },
+ { }
+};
+
+U_BOOT_DRIVER(google_cros_ec_spi) = {
+ .name = "google_cros_ec_spi",
+ .id = UCLASS_CROS_EC,
+ .of_match = cros_ec_ids,
+ .probe = cros_ec_probe,
+ .ops = &cros_ec_ops,
+};