1 files changed, 262 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/misc/cros_ec_lpc.c b/roms/u-boot/drivers/misc/cros_ec_lpc.c
new file mode 100644
index 000000000..f40375978
--- /dev/null
+++ b/roms/u-boot/drivers/misc/cros_ec_lpc.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Chromium OS cros_ec driver - LPC 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 <dm.h>
+#include <command.h>
+#include <cros_ec.h>
+#include <log.h>
+#include <asm/io.h>
+
+#ifdef DEBUG_TRACE
+#define debug_trace(fmt, b...)	debug(fmt, ##b)
+#else
+#define debug_trace(fmt, b...)
+#endif
+
+/* Timeout waiting for a flash erase command to complete */
+static const int CROS_EC_CMD_TIMEOUT_MS = 5000;
+
+static int wait_for_sync(struct cros_ec_dev *dev)
+{
+	unsigned long start;
+
+	start = get_timer(0);
+	while (inb(EC_LPC_ADDR_HOST_CMD) & EC_LPC_STATUS_BUSY_MASK) {
+		if (get_timer(start) > CROS_EC_CMD_TIMEOUT_MS) {
+			debug("%s: Timeout waiting for CROS_EC sync\n",
+			      __func__);
+			return -1;
+		}
+	}
+
+	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)
+{
+	struct cros_ec_dev *dev = dev_get_uclass_priv(udev);
+	const int cmd_addr = EC_LPC_ADDR_HOST_CMD;
+	const int data_addr = EC_LPC_ADDR_HOST_DATA;
+	const int args_addr = EC_LPC_ADDR_HOST_ARGS;
+	const int param_addr = EC_LPC_ADDR_HOST_PARAM;
+
+	struct ec_lpc_host_args args;
+	uint8_t *d;
+	int csum;
+	int i;
+
+	if (dout_len > EC_PROTO2_MAX_PARAM_SIZE) {
+		debug("%s: Cannot send %d bytes\n", __func__, dout_len);
+		return -1;
+	}
+
+	/* Fill in args */
+	args.flags = EC_HOST_ARGS_FLAG_FROM_HOST;
+	args.command_version = cmd_version;
+	args.data_size = dout_len;
+
+	/* Calculate checksum */
+	csum = cmd + args.flags + args.command_version + args.data_size;
+	for (i = 0, d = (uint8_t *)dout; i < dout_len; i++, d++)
+		csum += *d;
+
+	args.checksum = (uint8_t)csum;
+
+	if (wait_for_sync(dev)) {
+		debug("%s: Timeout waiting ready\n", __func__);
+		return -1;
+	}
+
+	/* Write args */
+	for (i = 0, d = (uint8_t *)&args; i < sizeof(args); i++, d++)
+		outb(*d, args_addr + i);
+
+	/* Write data, if any */
+	debug_trace("cmd: %02x, ver: %02x", cmd, cmd_version);
+	for (i = 0, d = (uint8_t *)dout; i < dout_len; i++, d++) {
+		outb(*d, param_addr + i);
+		debug_trace("%02x ", *d);
+	}
+
+	outb(cmd, cmd_addr);
+	debug_trace("\n");
+
+	if (wait_for_sync(dev)) {
+		debug("%s: Timeout waiting for response\n", __func__);
+		return -1;
+	}
+
+	/* Check result */
+	i = inb(data_addr);
+	if (i) {
+		debug("%s: CROS_EC result code %d\n", __func__, i);
+		return -i;
+	}
+
+	/* Read back args */
+	for (i = 0, d = (uint8_t *)&args; i < sizeof(args); i++, d++)
+		*d = inb(args_addr + i);
+
+	/*
+	 * If EC didn't modify args flags, then somehow we sent a new-style
+	 * command to an old EC, which means it would have read its params
+	 * from the wrong place.
+	 */
+	if (!(args.flags & EC_HOST_ARGS_FLAG_TO_HOST)) {
+		debug("%s: CROS_EC protocol mismatch\n", __func__);
+		return -EC_RES_INVALID_RESPONSE;
+	}
+
+	if (args.data_size > din_len) {
+		debug("%s: CROS_EC returned too much data %d > %d\n",
+		      __func__, args.data_size, din_len);
+		return -EC_RES_INVALID_RESPONSE;
+	}
+
+	/* Read data, if any */
+	for (i = 0, d = (uint8_t *)dev->din; i < args.data_size; i++, d++) {
+		*d = inb(param_addr + i);
+		debug_trace("%02x ", *d);
+	}
+	debug_trace("\n");
+
+	/* Verify checksum */
+	csum = cmd + args.flags + args.command_version + args.data_size;
+	for (i = 0, d = (uint8_t *)dev->din; i < args.data_size; i++, d++)
+		csum += *d;
+
+	if (args.checksum != (uint8_t)csum) {
+		debug("%s: CROS_EC response has invalid checksum\n", __func__);
+		return -EC_RES_INVALID_CHECKSUM;
+	}
+	*dinp = dev->din;
+
+	/* Return actual amount of data received */
+	return args.data_size;
+}
+
+/**
+ * Initialize LPC protocol.
+ *
+ * @param dev		CROS_EC device
+ * @param blob		Device tree blob
+ * @return 0 if ok, -1 on error
+ */
+int cros_ec_lpc_init(struct cros_ec_dev *dev, const void *blob)
+{
+	int byte, i;
+
+	/* See if we can find an EC at the other end */
+	byte = 0xff;
+	byte &= inb(EC_LPC_ADDR_HOST_CMD);
+	byte &= inb(EC_LPC_ADDR_HOST_DATA);
+	for (i = 0; i < EC_PROTO2_MAX_PARAM_SIZE && (byte == 0xff); i++)
+		byte &= inb(EC_LPC_ADDR_HOST_PARAM + i);
+	if (byte == 0xff) {
+		debug("%s: CROS_EC device not found on LPC bus\n",
+			__func__);
+		return -1;
+	}
+
+	return 0;
+}
+
+/* Return the byte of EC switch states */
+static int cros_ec_lpc_get_switches(struct udevice *dev)
+{
+	return inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_SWITCHES);
+}
+
+/*
+ * Test if LPC command args are supported.
+ *
+ * The cheapest way to do this is by looking for the memory-mapped
+ * flag.  This is faster than sending a new-style 'hello' command and
+ * seeing whether the EC sets the EC_HOST_ARGS_FLAG_FROM_HOST flag
+ * in args when it responds.
+ */
+static int cros_ec_lpc_check_version(struct udevice *dev)
+{
+	if (inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID) == 'E' &&
+			inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID + 1)
+				== 'C' &&
+			(inb(EC_LPC_ADDR_MEMMAP +
+				EC_MEMMAP_HOST_CMD_FLAGS) &
+				EC_HOST_CMD_FLAG_LPC_ARGS_SUPPORTED)) {
+		return 0;
+	}
+
+	printf("%s: ERROR: old EC interface not supported\n", __func__);
+	return -1;
+}
+
+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_lpc_packet,
+	.command = cros_ec_lpc_command,
+	.check_version = cros_ec_lpc_check_version,
+	.get_switches = cros_ec_lpc_get_switches,
+};
+
+static const struct udevice_id cros_ec_ids[] = {
+	{ .compatible = "google,cros-ec-lpc" },
+	{ }
+};
+
+U_BOOT_DRIVER(google_cros_ec_lpc) = {
+	.name		= "google_cros_ec_lpc",
+	.id		= UCLASS_CROS_EC,
+	.of_match	= cros_ec_ids,
+	.probe		= cros_ec_probe,
+	.ops		= &cros_ec_ops,
+};