1 files changed, 193 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/misc/cros_ec_spi.c b/roms/u-boot/drivers/misc/cros_ec_spi.c
new file mode 100644
index 000000000..bbc96301a
--- /dev/null
+++ b/roms/u-boot/drivers/misc/cros_ec_spi.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Chromium OS cros_ec driver - SPI interface
+ *
+ * Copyright (c) 2012 The Chromium OS Authors.
+ */
+
+/*
+ * The Matrix Keyboard Protocol driver handles talking to the keyboard
+ * controller chip. Mostly this is for keyboard functions, but some other
+ * things have slipped in, so we provide generic services to talk to the
+ * KBC.
+ */
+
+#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.
+ *
+ * The device's internal input/output buffers are used.
+ *
+ * @param dev		CROS_EC device
+ * @param cmd		Command to send (EC_CMD_...)
+ * @param cmd_version	Version of command to send (EC_VER_...)
+ * @param dout		Output data (may be NULL If dout_len=0)
+ * @param dout_len      Size of output data in bytes
+ * @param dinp		Returns pointer to response data. This will be
+ *			untouched unless we return a value > 0.
+ * @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 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.
+	 */
+	if (in_bytes > sizeof(dev->din)) {
+		debug("%s: Cannot receive %d bytes\n", __func__, din_len);
+		return -1;
+	}
+
+	/* We represent message length as a byte */
+	if (dout_len > 0xff) {
+		debug("%s: Cannot send %d bytes\n", __func__, dout_len);
+		return -1;
+	}
+
+	/*
+	 * Clear input buffer so we don't get false hits for MSG_HEADER
+	 */
+	memset(dev->din, '\0', in_bytes);
+
+	if (spi_claim_bus(slave)) {
+		debug("%s: Cannot claim SPI bus\n", __func__);
+		return -1;
+	}
+
+	out = dev->dout;
+	out[0] = EC_CMD_VERSION0 + cmd_version;
+	out[1] = cmd;
+	out[2] = (uint8_t)dout_len;
+	memcpy(out + 3, dout, dout_len);
+	csum = cros_ec_calc_checksum(out, 3)
+	       + cros_ec_calc_checksum(dout, dout_len);
+	out[3 + dout_len] = (uint8_t)csum;
+
+	/*
+	 * Send output data and receive input data starting such that the
+	 * message body will be dword aligned.
+	 */
+	p = dev->din + sizeof(int64_t) - 2;
+	len = dout_len + 4;
+	cros_ec_dump_data("out", cmd, out, len);
+	rv = spi_xfer(slave, max(len, in_bytes) * 8, out, p,
+		      SPI_XFER_BEGIN | SPI_XFER_END);
+
+	spi_release_bus(slave);
+
+	if (rv) {
+		debug("%s: Cannot complete SPI transfer\n", __func__);
+		return -1;
+	}
+
+	len = min((int)p[1], din_len);
+	cros_ec_dump_data("in", -1, p, len + 3);
+
+	/* Response code is first byte of message */
+	if (p[0] != EC_RES_SUCCESS) {
+		printf("%s: Returned status %d\n", __func__, p[0]);
+		return -(int)(p[0]);
+	}
+
+	/* Check checksum */
+	csum = cros_ec_calc_checksum(p, len + 2);
+	if (csum != p[len + 2]) {
+		debug("%s: Invalid checksum rx %#02x, calced %#02x\n", __func__,
+		      p[2 + len], csum);
+		return -1;
+	}
+
+	/* Anything else is the response data */
+	*dinp = p + 2;
+
+	return len;
+}
+
+static int cros_ec_probe(struct udevice *dev)
+{
+	return cros_ec_register(dev);
+}
+
+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,
+};