* Chromium OS cros_ec driver - I2C 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
+ * SPDX-License-Identifier: GPL-2.0+
*/
/*
*/
#include <common.h>
+#include <dm.h>
#include <i2c.h>
#include <cros_ec.h>
#define debug_trace(fmt, b...)
#endif
-int cros_ec_i2c_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)
+static int cros_ec_i2c_command(struct udevice *udev, uint8_t cmd,
+ int cmd_version, const uint8_t *dout,
+ int dout_len, uint8_t **dinp, int din_len)
{
- int old_bus = 0;
+ struct cros_ec_dev *dev = dev_get_uclass_priv(udev);
/* version8, cmd8, arglen8, out8[dout_len], csum8 */
int out_bytes = dout_len + 4;
/* response8, arglen8, in8[din_len], checksum8 */
uint8_t *ptr;
/* Receive input data, so that args will be dword aligned */
uint8_t *in_ptr;
- int ret;
-
- old_bus = i2c_get_bus_num();
+ int len, csum, ret;
/*
* Sanity-check I/O sizes given transaction overhead in internal
* will be dword aligned.
*/
in_ptr = dev->din + sizeof(int64_t);
- if (!dev->cmd_version_is_supported) {
- /* Send an old-style command */
- *ptr++ = cmd;
- out_bytes = dout_len + 1;
- in_bytes = din_len + 2;
- in_ptr--; /* Expect just a status byte */
- } else {
- *ptr++ = EC_CMD_VERSION0 + cmd_version;
- *ptr++ = cmd;
- *ptr++ = dout_len;
- in_ptr -= 2; /* Expect status, length bytes */
+
+ if (dev->protocol_version != 2) {
+ /* Something we don't support */
+ debug("%s: Protocol version %d unsupported\n",
+ __func__, dev->protocol_version);
+ return -1;
}
+
+ *ptr++ = EC_CMD_VERSION0 + cmd_version;
+ *ptr++ = cmd;
+ *ptr++ = dout_len;
+ in_ptr -= 2; /* Expect status, length bytes */
+
memcpy(ptr, dout, dout_len);
ptr += dout_len;
- if (dev->cmd_version_is_supported)
- *ptr++ = (uint8_t)
- cros_ec_calc_checksum(dev->dout, dout_len + 3);
-
- /* Set to the proper i2c bus */
- if (i2c_set_bus_num(dev->bus_num)) {
- debug("%s: Cannot change to I2C bus %d\n", __func__,
- dev->bus_num);
- return -1;
- }
+ *ptr++ = (uint8_t)
+ cros_ec_calc_checksum(dev->dout, dout_len + 3);
/* Send output data */
cros_ec_dump_data("out", -1, dev->dout, out_bytes);
- ret = i2c_write(dev->addr, 0, 0, dev->dout, out_bytes);
+ ret = dm_i2c_write(udev, 0, dev->dout, out_bytes);
if (ret) {
- debug("%s: Cannot complete I2C write to 0x%x\n",
- __func__, dev->addr);
+ debug("%s: Cannot complete I2C write to %s\n", __func__,
+ udev->name);
ret = -1;
}
if (!ret) {
- ret = i2c_read(dev->addr, 0, 0, in_ptr, in_bytes);
+ ret = dm_i2c_read(udev, 0, in_ptr, in_bytes);
if (ret) {
- debug("%s: Cannot complete I2C read from 0x%x\n",
- __func__, dev->addr);
+ debug("%s: Cannot complete I2C read from %s\n",
+ __func__, udev->name);
ret = -1;
}
}
- /* Return to original bus number */
- i2c_set_bus_num(old_bus);
- if (ret)
- return ret;
-
if (*in_ptr != EC_RES_SUCCESS) {
debug("%s: Received bad result code %d\n", __func__, *in_ptr);
return -(int)*in_ptr;
}
- if (dev->cmd_version_is_supported) {
- int len, csum;
-
- len = in_ptr[1];
- if (len + 3 > sizeof(dev->din)) {
- debug("%s: Received length %#02x too large\n",
- __func__, len);
- return -1;
- }
- csum = cros_ec_calc_checksum(in_ptr, 2 + len);
- if (csum != in_ptr[2 + len]) {
- debug("%s: Invalid checksum rx %#02x, calced %#02x\n",
- __func__, in_ptr[2 + din_len], csum);
- return -1;
- }
- din_len = min(din_len, len);
- cros_ec_dump_data("in", -1, in_ptr, din_len + 3);
- } else {
- cros_ec_dump_data("in (old)", -1, in_ptr, in_bytes);
+ len = in_ptr[1];
+ if (len + 3 > sizeof(dev->din)) {
+ debug("%s: Received length %#02x too large\n",
+ __func__, len);
+ return -1;
+ }
+ csum = cros_ec_calc_checksum(in_ptr, 2 + len);
+ if (csum != in_ptr[2 + len]) {
+ debug("%s: Invalid checksum rx %#02x, calced %#02x\n",
+ __func__, in_ptr[2 + din_len], csum);
+ return -1;
}
+ din_len = min(din_len, len);
+ cros_ec_dump_data("in", -1, in_ptr, din_len + 3);
/* Return pointer to dword-aligned input data, if any */
*dinp = dev->din + sizeof(int64_t);
return din_len;
}
-int cros_ec_i2c_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,
- "i2c-max-frequency", 100000);
- dev->bus_num = i2c_get_bus_num_fdt(dev->parent_node);
- if (dev->bus_num == -1) {
- debug("%s: Failed to read bus number\n", __func__);
- return -1;
- }
- dev->addr = fdtdec_get_int(blob, dev->node, "reg", -1);
- if (dev->addr == -1) {
- debug("%s: Failed to read device address\n", __func__);
- return -1;
- }
-
- return 0;
+ return cros_ec_register(dev);
}
-/**
- * Initialize I2C protocol.
- *
- * @param dev CROS_EC device
- * @param blob Device tree blob
- * @return 0 if ok, -1 on error
- */
-int cros_ec_i2c_init(struct cros_ec_dev *dev, const void *blob)
-{
- i2c_init(dev->max_frequency, dev->addr);
-
- dev->cmd_version_is_supported = 0;
-
- return 0;
-}
+static struct dm_cros_ec_ops cros_ec_ops = {
+ .command = cros_ec_i2c_command,
+};
+
+static const struct udevice_id cros_ec_ids[] = {
+ { .compatible = "google,cros-ec-i2c" },
+ { }
+};
+
+U_BOOT_DRIVER(cros_ec_i2c) = {
+ .name = "cros_ec_i2c",
+ .id = UCLASS_CROS_EC,
+ .of_match = cros_ec_ids,
+ .probe = cros_ec_probe,
+ .ops = &cros_ec_ops,
+};
projects / karo-tx-uboot.git / blobdiff