+// SPDX-License-Identifier: GPL-2.0+
/*
* Chromium OS cros_ec driver - I2C interface
*
* Copyright (c) 2012 The Chromium OS Authors.
- *
- * 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)
+/**
+ * Request format for protocol v3
+ * byte 0 0xda (EC_COMMAND_PROTOCOL_3)
+ * byte 1-8 struct ec_host_request
+ * byte 10- response data
+ */
+struct ec_host_request_i2c {
+ /* Always 0xda to backward compatible with v2 struct */
+ uint8_t command_protocol;
+ struct ec_host_request ec_request;
+} __packed;
+
+/*
+ * Response format for protocol v3
+ * byte 0 result code
+ * byte 1 packet_length
+ * byte 2-9 struct ec_host_response
+ * byte 10- response data
+ */
+struct ec_host_response_i2c {
+ uint8_t result;
+ uint8_t packet_length;
+ struct ec_host_response ec_response;
+} __packed;
+
+static int cros_ec_i2c_packet(struct udevice *udev, int out_bytes, int in_bytes)
{
- int old_bus = 0;
+ struct cros_ec_dev *dev = dev_get_uclass_priv(udev);
+ struct dm_i2c_chip *chip = dev_get_parent_platdata(udev);
+ struct ec_host_request_i2c *ec_request_i2c =
+ (struct ec_host_request_i2c *)dev->dout;
+ struct ec_host_response_i2c *ec_response_i2c =
+ (struct ec_host_response_i2c *)dev->din;
+ struct i2c_msg i2c_msg[2];
+ int ret;
+
+ i2c_msg[0].addr = chip->chip_addr;
+ i2c_msg[0].flags = 0;
+ i2c_msg[1].addr = chip->chip_addr;
+ i2c_msg[1].flags = I2C_M_RD;
+
+ /* one extra byte, to indicate v3 */
+ i2c_msg[0].len = out_bytes + 1;
+ i2c_msg[0].buf = dev->dout;
+
+ /* stitch on EC_COMMAND_PROTOCOL_3 */
+ memmove(&ec_request_i2c->ec_request, dev->dout, out_bytes);
+ ec_request_i2c->command_protocol = EC_COMMAND_PROTOCOL_3;
+
+ /* two extra bytes for v3 */
+ i2c_msg[1].len = in_bytes + 2;
+ i2c_msg[1].buf = dev->din;
+
+ ret = dm_i2c_xfer(udev, &i2c_msg[0], 2);
+ if (ret) {
+ printf("%s: Could not execute transfer: %d\n", __func__, ret);
+ return ret;
+ }
+
+ /* When we send a v3 request to v2 ec, ec won't recognize the 0xda
+ * (EC_COMMAND_PROTOCOL_3) and will return with status
+ * EC_RES_INVALID_COMMAND with zero data length
+ *
+ * In case of invalid command for v3 protocol the data length
+ * will be at least sizeof(struct ec_host_response)
+ */
+ if (ec_response_i2c->result == EC_RES_INVALID_COMMAND &&
+ ec_response_i2c->packet_length == 0)
+ return -EPROTONOSUPPORT;
+
+ if (ec_response_i2c->packet_length < sizeof(struct ec_host_response)) {
+ printf("%s: response of %u bytes too short; not a full hdr\n",
+ __func__, ec_response_i2c->packet_length);
+ return -EBADMSG;
+ }
+
+
+ /* drop result and packet_len */
+ memmove(dev->din, &ec_response_i2c->ec_response, in_bytes);
+
+ return in_bytes;
+}
+
+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)
+{
+ struct cros_ec_dev *dev = dev_get_uclass_priv(udev);
+ struct dm_i2c_chip *chip = dev_get_parent_platdata(udev);
+ struct i2c_msg i2c_msg[2];
/* 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
assert(dout_len >= 0);
assert(dinp);
+ i2c_msg[0].addr = chip->chip_addr;
+ i2c_msg[0].len = out_bytes;
+ i2c_msg[0].buf = dev->dout;
+ i2c_msg[0].flags = 0;
+
/*
* Copy command and data into output buffer so we can do a single I2C
* burst transaction.
* 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);
+ *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;
- }
+ i2c_msg[1].addr = chip->chip_addr;
+ i2c_msg[1].len = in_bytes;
+ i2c_msg[1].buf = in_ptr;
+ i2c_msg[1].flags = I2C_M_RD;
/* 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_xfer(udev, &i2c_msg[0], 2);
if (ret) {
- debug("%s: Cannot complete I2C write to 0x%x\n",
- __func__, dev->addr);
+ debug("%s: Could not execute transfer to %s\n", __func__,
+ udev->name);
ret = -1;
}
- if (!ret) {
- ret = i2c_read(dev->addr, 0, 0, in_ptr, in_bytes);
- if (ret) {
- debug("%s: Cannot complete I2C read from 0x%x\n",
- __func__, dev->addr);
- 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,
+ .packet = cros_ec_i2c_packet,
+};
+
+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 / oweals / u-boot.git / blobdiff