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[src/trunk]: src/sys/dev/i2c Add GPIO drivers for MAX77620 and TCA9539 as fou...
details: https://anonhg.NetBSD.org/src/rev/02a1d8bbbfd5
branches: trunk
changeset: 826702:02a1d8bbbfd5
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Fri Sep 22 18:12:31 2017 +0000
description:
Add GPIO drivers for MAX77620 and TCA9539 as found in Jetson TX1
diffstat:
sys/dev/i2c/files.i2c | 12 +-
sys/dev/i2c/max77620.c | 286 +++++++++++++++++++++++++++++++++++++++++++++++++
sys/dev/i2c/tcagpio.c | 275 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 572 insertions(+), 1 deletions(-)
diffs (truncated from 592 to 300 lines):
diff -r da21ee131461 -r 02a1d8bbbfd5 sys/dev/i2c/files.i2c
--- a/sys/dev/i2c/files.i2c Fri Sep 22 18:09:48 2017 +0000
+++ b/sys/dev/i2c/files.i2c Fri Sep 22 18:12:31 2017 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.i2c,v 1.75 2017/08/31 19:55:43 jmcneill Exp $
+# $NetBSD: files.i2c,v 1.76 2017/09/22 18:12:31 jmcneill Exp $
obsolete defflag opt_i2cbus.h I2C_SCAN
define i2cbus { }
@@ -267,3 +267,13 @@
device tcakp: wskbddev, linux_keymap
attach tcakp at iic
file dev/i2c/tcakp.c tcakp
+
+# MAXIM MAX77620 Power Management IC
+device max77620pmic
+attach max77620pmic at iic
+file dev/i2c/max77620.c max77620pmic
+
+# Texas Instruments TCA9539 I/O Expander
+device tcagpio
+attach tcagpio at iic
+file dev/i2c/tcagpio.c tcagpio
diff -r da21ee131461 -r 02a1d8bbbfd5 sys/dev/i2c/max77620.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/i2c/max77620.c Fri Sep 22 18:12:31 2017 +0000
@@ -0,0 +1,286 @@
+/* $NetBSD: max77620.c,v 1.1 2017/09/22 18:12:31 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: max77620.c,v 1.1 2017/09/22 18:12:31 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/device.h>
+#include <sys/conf.h>
+#include <sys/bus.h>
+#include <sys/kmem.h>
+#include <sys/gpio.h>
+
+#include <dev/i2c/i2cvar.h>
+
+#include <dev/fdt/fdtvar.h>
+
+#define MAX_GPIO_REG(n) (0x36 + (n))
+#define MAX_GPIO_DEBOUNCE __BITS(7,6)
+#define MAX_GPIO_INT __BITS(5,4)
+#define MAX_GPIO_OUTPUT_VAL __BIT(3)
+#define MAX_GPIO_INPUT_VAL __BIT(2)
+#define MAX_GPIO_DIR __BIT(1)
+#define MAX_GPIO_DRV __BIT(0)
+
+#define MAX_GPIO_COUNT 8
+
+struct max77620_softc {
+ device_t sc_dev;
+ i2c_tag_t sc_i2c;
+ i2c_addr_t sc_addr;
+ int sc_phandle;
+};
+
+struct max77620_pin {
+ struct max77620_softc *pin_sc;
+ int pin_num;
+ int pin_flags;
+ bool pin_actlo;
+};
+
+static const char * max77620_compats[] = {
+ "maxim,max77620",
+ NULL
+};
+
+static uint8_t
+max77620_read(struct max77620_softc *sc, uint8_t reg, int flags)
+{
+ uint8_t val = 0;
+ int error;
+
+ error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr,
+ ®, 1, &val, 1, flags);
+ if (error != 0)
+ aprint_error_dev(sc->sc_dev, "error reading reg %#x: %d\n", reg, error);
+
+ return val;
+}
+
+static void
+max77620_write(struct max77620_softc *sc, uint8_t reg, uint8_t val, int flags)
+{
+ int error;
+
+ error = iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
+ ®, 1, &val, 1, flags);
+ if (error != 0)
+ aprint_error_dev(sc->sc_dev, "error writing reg %#x: %d\n", reg, error);
+}
+
+#define I2C_READ(sc, reg) max77620_read((sc), (reg), I2C_F_POLL)
+#define I2C_WRITE(sc, reg, val) max77620_write((sc), (reg) << 1, (val), I2C_F_POLL)
+#define I2C_LOCK(sc) iic_acquire_bus((sc)->sc_i2c, I2C_F_POLL)
+#define I2C_UNLOCK(sc) iic_release_bus((sc)->sc_i2c, I2C_F_POLL)
+
+static int
+max77620_gpio_config(struct max77620_softc *sc, int pin, int flags)
+{
+ uint32_t gpio;
+
+ KASSERT(pin >= 0 && pin < MAX_GPIO_COUNT);
+
+ gpio = I2C_READ(sc, MAX_GPIO_REG(pin));
+
+ switch (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
+ case GPIO_PIN_INPUT:
+ gpio |= MAX_GPIO_DIR;
+ break;
+ case GPIO_PIN_OUTPUT:
+ gpio &= ~MAX_GPIO_DIR;
+ break;
+ default:
+ return EINVAL;
+ }
+
+ switch (flags & (GPIO_PIN_PUSHPULL|GPIO_PIN_OPENDRAIN)) {
+ case GPIO_PIN_PUSHPULL:
+ gpio |= MAX_GPIO_DRV;
+ break;
+ case GPIO_PIN_OPENDRAIN:
+ gpio &= ~MAX_GPIO_DRV;
+ break;
+ default:
+ return EINVAL;
+ }
+
+ I2C_WRITE(sc, MAX_GPIO_REG(pin), gpio);
+
+ return 0;
+}
+
+static void *
+max77620_gpio_acquire(device_t dev, const void *data, size_t len, int flags)
+{
+ struct max77620_softc * const sc = device_private(dev);
+ struct max77620_pin *gpin;
+ const u_int *gpio = data;
+ int error;
+
+ if (len != 12)
+ return NULL;
+
+ const uint8_t pin = be32toh(gpio[1]) & 0xff;
+ const bool actlo = (be32toh(gpio[2]) & __BIT(0)) != 0;
+ const bool pushpull = (be32toh(gpio[2]) & __BIT(1)) == 0;
+ const bool opendrain = (be32toh(gpio[2]) & __BIT(2)) != 0;
+
+ if (pushpull)
+ flags |= GPIO_PIN_PUSHPULL;
+ if (opendrain)
+ flags |= GPIO_PIN_OPENDRAIN;
+
+ if (pin >= MAX_GPIO_COUNT)
+ return NULL;
+
+ I2C_LOCK(sc);
+ error = max77620_gpio_config(sc, pin, flags);
+ I2C_UNLOCK(sc);
+
+ if (error != 0) {
+ device_printf(dev, "bad pin %d config %#x\n", pin, flags);
+ return NULL;
+ }
+
+ gpin = kmem_zalloc(sizeof(*gpin), KM_SLEEP);
+ gpin->pin_sc = sc;
+ gpin->pin_num = pin;
+ gpin->pin_flags = flags;
+ gpin->pin_actlo = actlo;
+
+ return gpin;
+}
+
+static void
+max77620_gpio_release(device_t dev, void *priv)
+{
+ struct max77620_softc * const sc = device_private(dev);
+ struct max77620_pin *gpin = priv;
+
+ I2C_LOCK(sc);
+ max77620_gpio_config(sc, gpin->pin_num, GPIO_PIN_INPUT|GPIO_PIN_OPENDRAIN);
+ I2C_UNLOCK(sc);
+
+ kmem_free(gpin, sizeof(*gpin));
+}
+
+static int
+max77620_gpio_read(device_t dev, void *priv, bool raw)
+{
+ struct max77620_softc * const sc = device_private(dev);
+ struct max77620_pin *gpin = priv;
+ uint8_t gpio;
+ int val;
+
+ I2C_LOCK(sc);
+ gpio = I2C_READ(sc, MAX_GPIO_REG(gpin->pin_num));
+ I2C_UNLOCK(sc);
+
+ val = __SHIFTOUT(gpio, MAX_GPIO_INPUT_VAL);
+ if (!raw && gpin->pin_actlo)
+ val = !val;
+
+#ifdef MAX77620_DEBUG
+ device_printf(sc->sc_dev, "GPIO%d rd %02x (%d %d)\n",
+ gpin->pin_num, gpio,
+ (int)__SHIFTOUT(gpio, MAX_GPIO_INPUT_VAL), val);
+#endif
+
+ return val;
+}
+
+static void
+max77620_gpio_write(device_t dev, void *priv, int val, bool raw)
+{
+ struct max77620_softc * const sc = device_private(dev);
+ struct max77620_pin *gpin = priv;
+ uint8_t gpio;
+
+ if (!raw && gpin->pin_actlo)
+ val = !val;
+
+ I2C_LOCK(sc);
+ gpio = I2C_READ(sc, MAX_GPIO_REG(gpin->pin_num));
+ gpio &= ~MAX_GPIO_OUTPUT_VAL;
+ gpio |= __SHIFTIN(val, MAX_GPIO_OUTPUT_VAL);
+#ifdef MAX77620_DEBUG
+ device_printf(sc->sc_dev, "GPIO%d wr %02x -> %02x\n",
+ gpin->pin_num,
+ I2C_READ(sc, MAX_GPIO_REG(gpin->pin_num)), gpio);
+#endif
+ I2C_WRITE(sc, MAX_GPIO_REG(gpin->pin_num), gpio);
+ I2C_UNLOCK(sc);
+}
+
+static struct fdtbus_gpio_controller_func max77620_gpio_funcs = {
+ .acquire = max77620_gpio_acquire,
+ .release = max77620_gpio_release,
+ .read = max77620_gpio_read,
+ .write = max77620_gpio_write,
+};
+
+static void
+max77620_gpio_attach(struct max77620_softc *sc)
+{
+ fdtbus_register_gpio_controller(sc->sc_dev, sc->sc_phandle,
+ &max77620_gpio_funcs);
+}
+
+static int
+max77620_match(device_t parent, cfdata_t match, void *aux)
+{
+ struct i2c_attach_args *ia = aux;
+
+ if (ia->ia_name == NULL)
+ return 0;
+
+ return iic_compat_match(ia, max77620_compats);
+}
+
+static void
+max77620_attach(device_t parent, device_t self, void *aux)
+{
+ struct max77620_softc * const sc = device_private(self);
+ struct i2c_attach_args *ia = aux;
+
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