i2c: Add a mux for GPIO-based I2C bus arbitration

While I2C supports multi-master buses this is difficult to get right.
The implementation on the master side in software is quite complex.
Clock-stretching and the arbitrary time that an I2C transaction can take
make it difficult to share the bus fairly in the face of high traffic.
When one or more masters can be reset independently part-way through a
transaction it is hard to know the state of the bus.

This driver provides a scheme based on two 'claim' GPIOs, one driven by the
AP (Application Processor, meaning the main CPU) and one driven by the EC
(Embedded Controller, a small CPU aimed at handling system tasks). With
these they can communicate and reliably share the bus. This scheme has
minimal overhead and involves very little code. It is used on snow to
permit the EC and the AP to share access to the main system PMIC and
battery. The scheme can survive reboots by either side without difficulty.
This scheme has been tested in the field with millions of devices.

Since U-Boot runs on the AP, the terminology used is 'our' claim GPIO,
meaning the AP's, and 'their' claim GPIO, meaning the EC's. This terminology
is used by the device tree bindings in Linux also.

Signed-off-by: Simon Glass <sjg@chromium.org>

3 files changed, 157 insertions, 0 deletions

diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig
index a05b32d..bd3e078 100644
--- a/drivers/i2c/muxes/Kconfig
+++ b/drivers/i2c/muxes/Kconfig
@@ -6,3 +6,12 @@ config I2C_MUX
 	  one of several buses using some sort of control mechanism. The
 	  bus select is handled automatically when that bus is accessed,
 	  using a suitable I2C MUX driver.
+
+config I2C_ARB_GPIO_CHALLENGE
+        bool "GPIO-based I2C arbitration"
+        depends on I2C_MUX
+        help
+          If you say yes to this option, support will be included for an
+          I2C multimaster arbitration scheme using GPIOs and a challenge &
+          response mechanism where masters have to claim the bus by asserting
+          a GPIO.
diff --git a/drivers/i2c/muxes/Makefile b/drivers/i2c/muxes/Makefile
index 7583e3a..612cc27 100644
--- a/drivers/i2c/muxes/Makefile
+++ b/drivers/i2c/muxes/Makefile
@@ -3,4 +3,5 @@
 #
 # SPDX-License-Identifier:	GPL-2.0+
 #
+obj-$(CONFIG_I2C_ARB_GPIO_CHALLENGE) += i2c-arb-gpio-challenge.o
 obj-$(CONFIG_I2C_MUX) += i2c-mux-uclass.o
diff --git a/drivers/i2c/muxes/i2c-arb-gpio-challenge.c b/drivers/i2c/muxes/i2c-arb-gpio-challenge.c
new file mode 100644
index 0000000..3f072c7
--- /dev/null
+++ b/drivers/i2c/muxes/i2c-arb-gpio-challenge.c
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <i2c.h>
+#include <asm/gpio.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct i2c_arbitrator_priv {
+	struct gpio_desc ap_claim;
+	struct gpio_desc ec_claim;
+	uint slew_delay_us;
+	uint wait_retry_ms;
+	uint wait_free_ms;
+};
+
+int i2c_arbitrator_deselect(struct udevice *mux, struct udevice *bus,
+			    uint channel)
+{
+	struct i2c_arbitrator_priv *priv = dev_get_priv(mux);
+	int ret;
+
+	debug("%s: %s\n", __func__, mux->name);
+	ret = dm_gpio_set_value(&priv->ap_claim, 0);
+	udelay(priv->slew_delay_us);
+
+	return ret;
+}
+
+int i2c_arbitrator_select(struct udevice *mux, struct udevice *bus,
+			  uint channel)
+{
+	struct i2c_arbitrator_priv *priv = dev_get_priv(mux);
+	unsigned start;
+	int ret;
+
+	debug("%s: %s\n", __func__, mux->name);
+	/* Start a round of trying to claim the bus */
+	start = get_timer(0);
+	do {
+		unsigned start_retry;
+		int waiting = 0;
+
+		/* Indicate that we want to claim the bus */
+		ret = dm_gpio_set_value(&priv->ap_claim, 1);
+		if (ret)
+			goto err;
+		udelay(priv->slew_delay_us);
+
+		/* Wait for the EC to release it */
+		start_retry = get_timer(0);
+		while (get_timer(start_retry) < priv->wait_retry_ms) {
+			ret = dm_gpio_get_value(&priv->ec_claim);
+			if (ret < 0) {
+				goto err;
+			} else if (!ret) {
+				/* We got it, so return */
+				return 0;
+			}
+
+			if (!waiting)
+				waiting = 1;
+		}
+
+		/* It didn't release, so give up, wait, and try again */
+		ret = dm_gpio_set_value(&priv->ap_claim, 0);
+		if (ret)
+			goto err;
+
+		mdelay(priv->wait_retry_ms);
+	} while (get_timer(start) < priv->wait_free_ms);
+
+	/* Give up, release our claim */
+	printf("I2C: Could not claim bus, timeout %lu\n", get_timer(start));
+	ret = -ETIMEDOUT;
+	ret = 0;
+err:
+	return ret;
+}
+
+static int i2c_arbitrator_probe(struct udevice *dev)
+{
+	struct i2c_arbitrator_priv *priv = dev_get_priv(dev);
+	const void *blob = gd->fdt_blob;
+	int node = dev->of_offset;
+	int ret;
+
+	debug("%s: %s\n", __func__, dev->name);
+	priv->slew_delay_us = fdtdec_get_int(blob, node, "slew-delay-us", 0);
+	priv->wait_retry_ms = fdtdec_get_int(blob, node, "wait-retry-us", 0) /
+		1000;
+	priv->wait_free_ms = fdtdec_get_int(blob, node, "wait-free-us", 0) /
+		1000;
+	ret = gpio_request_by_name(dev, "our-claim-gpio", 0, &priv->ap_claim,
+				   GPIOD_IS_OUT);
+	if (ret)
+		goto err;
+	ret = gpio_request_by_name(dev, "their-claim-gpios", 0, &priv->ec_claim,
+				   GPIOD_IS_IN);
+	if (ret)
+		goto err_ec_gpio;
+
+	return 0;
+
+err_ec_gpio:
+	dm_gpio_free(dev, &priv->ap_claim);
+err:
+	debug("%s: ret=%d\n", __func__, ret);
+	return ret;
+}
+
+static int i2c_arbitrator_remove(struct udevice *dev)
+{
+	struct i2c_arbitrator_priv *priv = dev_get_priv(dev);
+
+	dm_gpio_free(dev, &priv->ap_claim);
+	dm_gpio_free(dev, &priv->ec_claim);
+
+	return 0;
+}
+
+static const struct i2c_mux_ops i2c_arbitrator_ops = {
+	.select		= i2c_arbitrator_select,
+	.deselect	= i2c_arbitrator_deselect,
+};
+
+static const struct udevice_id i2c_arbitrator_ids[] = {
+	{ .compatible = "i2c-arb-gpio-challenge" },
+	{ }
+};
+
+U_BOOT_DRIVER(i2c_arbitrator) = {
+	.name = "i2c_arbitrator",
+	.id = UCLASS_I2C_MUX,
+	.of_match = i2c_arbitrator_ids,
+	.probe = i2c_arbitrator_probe,
+	.remove = i2c_arbitrator_remove,
+	.ops = &i2c_arbitrator_ops,
+	.priv_auto_alloc_size = sizeof(struct i2c_arbitrator_priv),
+};