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[src/trunk]: src/sys/dev/i2c Add driver for TI TWL4030 Power Management IC
details: https://anonhg.NetBSD.org/src/rev/11648fe43130
branches: trunk
changeset: 460680:11648fe43130
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Wed Oct 30 21:38:28 2019 +0000
description:
Add driver for TI TWL4030 Power Management IC
diffstat:
sys/dev/i2c/files.i2c | 7 +-
sys/dev/i2c/twl4030.c | 281 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 287 insertions(+), 1 deletions(-)
diffs (truncated from 303 to 300 lines):
diff -r 1e58efb48978 -r 11648fe43130 sys/dev/i2c/files.i2c
--- a/sys/dev/i2c/files.i2c Wed Oct 30 21:37:56 2019 +0000
+++ b/sys/dev/i2c/files.i2c Wed Oct 30 21:38:28 2019 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.i2c,v 1.101 2019/10/27 20:11:13 jmcneill Exp $
+# $NetBSD: files.i2c,v 1.102 2019/10/30 21:38:28 jmcneill Exp $
obsolete defflag opt_i2cbus.h I2C_SCAN
define i2cbus { }
@@ -373,3 +373,8 @@
device pcapwm: pwm
attach pcapwm at iic
file dev/i2c/pca9685.c pcapwm
+
+# TI TWL4030 Power Management IC
+device twl
+attach twl at iic
+file dev/i2c/twl4030.c twl
diff -r 1e58efb48978 -r 11648fe43130 sys/dev/i2c/twl4030.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/i2c/twl4030.c Wed Oct 30 21:38:28 2019 +0000
@@ -0,0 +1,281 @@
+/* $NetBSD: twl4030.c,v 1.1 2019/10/30 21:38:28 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2019 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: twl4030.c,v 1.1 2019/10/30 21:38:28 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 TWL_PIN_COUNT 16
+
+/* TWL4030 is a multi-function IC. Each module is at a separate I2C address */
+#define ADDR_USB 0x00
+#define ADDR_INT 0x01
+#define ADDR_AUX 0x02
+#define ADDR_POWER 0x03
+
+/* GPIO registers */
+#define GPIOBASE 0x98
+#define GPIODATAIN(pin) (GPIOBASE + 0x00 + (pin) / 8)
+#define GPIODATADIR(pin) (GPIOBASE + 0x03 + (pin) / 8)
+#define CLEARGPIODATAOUT(pin) (GPIOBASE + 0x09 + (pin) / 8)
+#define SETGPIODATAOUT(pin) (GPIOBASE + 0x0c + (pin) / 8)
+#define PIN_BIT(pin) __BIT((pin) % 8)
+#define GPIOPUPDCTR(pin) (GPIOBASE + 0x13 + (n) / 4)
+#define PUPD_BITS(pin) __BITS((pin) % 4 + 1, (pin) % 4)
+
+struct twl_softc {
+ device_t sc_dev;
+ i2c_tag_t sc_i2c;
+ i2c_addr_t sc_addr;
+ int sc_phandle;
+
+ int sc_npins;
+};
+
+struct twl_pin {
+ struct twl_softc *pin_sc;
+ int pin_num;
+ int pin_flags;
+ bool pin_actlo;
+};
+
+static const struct device_compatible_entry compat_data[] = {
+ { "ti,twl4030", 0 },
+ { NULL, 0 }
+};
+
+static const char * const gpio_compatible[] = { "ti,twl4030-gpio", NULL };
+
+static uint8_t
+twl_read(struct twl_softc *sc, uint8_t mod, 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 + mod,
+ ®, 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
+twl_write(struct twl_softc *sc, uint8_t mod, uint8_t reg, uint8_t val, int flags)
+{
+ uint8_t buf[2];
+ int error;
+
+ buf[0] = reg;
+ buf[1] = val;
+
+ error = iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr + mod,
+ NULL, 0, buf, 2, flags);
+ if (error != 0)
+ aprint_error_dev(sc->sc_dev, "error writing reg %#x: %d\n", reg, error);
+}
+
+#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)
+
+#define INT_READ(sc, reg) twl_read((sc), ADDR_INT, (reg), I2C_F_POLL)
+#define INT_WRITE(sc, reg, val) twl_write((sc), ADDR_INT, (reg), (val), I2C_F_POLL)
+
+static int
+twl_gpio_config(struct twl_softc *sc, int pin, int flags)
+{
+ uint8_t dir;
+
+ KASSERT(pin >= 0 && pin < sc->sc_npins);
+
+ dir = INT_READ(sc, GPIODATADIR(pin));
+
+ switch (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
+ case GPIO_PIN_INPUT:
+ dir &= ~PIN_BIT(pin);
+ break;
+ case GPIO_PIN_OUTPUT:
+ dir |= PIN_BIT(pin);
+ break;
+ default:
+ return EINVAL;
+ }
+
+ INT_WRITE(sc, GPIODATADIR(pin), dir);
+
+ return 0;
+}
+
+static void *
+twl_gpio_acquire(device_t dev, const void *data, size_t len, int flags)
+{
+ struct twl_softc * const sc = device_private(dev);
+ struct twl_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;
+
+ if (pin >= sc->sc_npins)
+ return NULL;
+
+ I2C_LOCK(sc);
+ error = twl_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
+twl_gpio_release(device_t dev, void *priv)
+{
+ struct twl_softc * const sc = device_private(dev);
+ struct twl_pin *gpin = priv;
+
+ I2C_LOCK(sc);
+ twl_gpio_config(sc, gpin->pin_num, GPIO_PIN_INPUT);
+ I2C_UNLOCK(sc);
+
+ kmem_free(gpin, sizeof(*gpin));
+}
+
+static int
+twl_gpio_read(device_t dev, void *priv, bool raw)
+{
+ struct twl_softc * const sc = device_private(dev);
+ struct twl_pin *gpin = priv;
+ uint8_t gpio;
+ int val;
+
+ I2C_LOCK(sc);
+ gpio = INT_READ(sc, GPIODATAIN(gpin->pin_num));
+ I2C_UNLOCK(sc);
+
+ val = __SHIFTOUT(gpio, PIN_BIT(gpin->pin_num));
+ if (!raw && gpin->pin_actlo)
+ val = !val;
+
+ return val;
+}
+
+static void
+twl_gpio_write(device_t dev, void *priv, int val, bool raw)
+{
+ struct twl_softc * const sc = device_private(dev);
+ struct twl_pin *gpin = priv;
+
+ if (!raw && gpin->pin_actlo)
+ val = !val;
+
+ I2C_LOCK(sc);
+ if (val)
+ INT_WRITE(sc, SETGPIODATAOUT(gpin->pin_num), PIN_BIT(gpin->pin_num));
+ else
+ INT_WRITE(sc, CLEARGPIODATAOUT(gpin->pin_num), PIN_BIT(gpin->pin_num));
+ I2C_UNLOCK(sc);
+}
+
+static struct fdtbus_gpio_controller_func twl_gpio_funcs = {
+ .acquire = twl_gpio_acquire,
+ .release = twl_gpio_release,
+ .read = twl_gpio_read,
+ .write = twl_gpio_write,
+};
+
+static void
+twl_gpio_attach(struct twl_softc *sc, const int phandle)
+{
+ fdtbus_register_gpio_controller(sc->sc_dev, phandle, &twl_gpio_funcs);
+}
+
+static int
+twl_match(device_t parent, cfdata_t match, void *aux)
+{
+ struct i2c_attach_args *ia = aux;
+ int match_result;
+
+ if (iic_use_direct_match(ia, match, compat_data, &match_result))
+ return match_result;
+
+ return 0;
+}
+
+static void
+twl_attach(device_t parent, device_t self, void *aux)
+{
+ struct twl_softc * const sc = device_private(self);
+ struct i2c_attach_args *ia = aux;
+ int child;
+
+ sc->sc_dev = self;
+ sc->sc_i2c = ia->ia_tag;
+ sc->sc_addr = ia->ia_addr;
+ sc->sc_phandle = ia->ia_cookie;
+ sc->sc_npins = TWL_PIN_COUNT;
+
+ aprint_naive("\n");
+ aprint_normal(": TWL4030");
+
+ for (child = OF_child(sc->sc_phandle); child; child = OF_peer(child)) {
+ if (of_match_compatible(child, gpio_compatible)) {
+ aprint_normal(", GPIO");
+ twl_gpio_attach(sc, child);
+ }
+ }
+ aprint_normal("\n");
+}
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