Add sypwr(4), a driver for the Silergy SY8106A regulator found on many boards

using the Allwinner H3/H5 SoC.

2 files changed, 167 insertions, 1 deletions

diff --git a/sys/dev/fdt/files.fdt b/sys/dev/fdt/files.fdt
index 29911b4d29f..5abe2d9c020 100644
--- a/sys/dev/fdt/files.fdt
+++ b/sys/dev/fdt/files.fdt
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.fdt,v 1.32 2017/12/18 20:23:16 kettenis Exp $
+#	$OpenBSD: files.fdt,v 1.33 2017/12/31 11:13:59 kettenis Exp $
 #
 # Config file and device description for machine-independent FDT code.
 # Included by ports that need it.
@@ -37,6 +37,10 @@ attach	axppmic at i2c
 attach	axppmic at rsb with axppmic_rsb
 file	dev/fdt/axppmic.c		axppmic
 
+device	sypwr
+attach	sypwr at i2c
+file	dev/fdt/sypwr.c			sypwr
+
 device	bcmaux
 attach	bcmaux at fdt
 file	dev/fdt/bcm2835_aux.c		bcmaux
diff --git a/sys/dev/fdt/sypwr.c b/sys/dev/fdt/sypwr.c
new file mode 100644
index 00000000000..e626256df9e
--- /dev/null
+++ b/sys/dev/fdt/sypwr.c
@@ -0,0 +1,162 @@
+/*	$OpenBSD: sypwr.c,v 1.1 2017/12/31 11:13:59 kettenis Exp $	*/
+/*
+ * Copyright (c) 2017 Mark Kettenis <kettenis@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/malloc.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_regulator.h>
+#include <dev/ofw/fdt.h>
+
+#include <dev/i2c/i2cvar.h>
+
+#define SY8106A_VOUT1_SEL		0x01
+#define  SY8106A_VOUT1_SEL_I2C		(1 << 7)
+#define  SY8106A_VOUT1_SEL_MASK 	0x7f
+
+struct sypwr_softc {
+	struct device	sc_dev;
+	i2c_tag_t	sc_tag;
+	i2c_addr_t	sc_addr;
+
+	struct regulator_device sc_rd;
+};
+
+int	sypwr_match(struct device *, void *, void *);
+void	sypwr_attach(struct device *, struct device *, void *);
+
+struct cfattach sypwr_ca = {
+	sizeof(struct sypwr_softc), sypwr_match, sypwr_attach
+};
+
+struct cfdriver sypwr_cd = {
+	NULL, "sypwr", DV_DULL
+};
+
+uint8_t	sypwr_read(struct sypwr_softc *, int);
+void	sypwr_write(struct sypwr_softc *, int, uint8_t);
+uint32_t sypwr_get_voltage(void *);
+int	sypwr_set_voltage(void *, uint32_t voltage);
+
+int
+sypwr_match(struct device *parent, void *match, void *aux)
+{
+	struct i2c_attach_args *ia = aux;
+	int node = *(int *)ia->ia_cookie;
+
+	return (OF_is_compatible(node, "silergy,sy8106a"));
+}
+
+void
+sypwr_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct sypwr_softc *sc = (struct sypwr_softc *)self;
+	struct i2c_attach_args *ia = aux;
+	int node = *(int *)ia->ia_cookie;
+	uint8_t reg;
+
+	sc->sc_tag = ia->ia_tag;
+	sc->sc_addr = ia->ia_addr;
+
+	/*
+	 * Only register the regulator if it is under I2C control
+	 * (i.e. initialized by the firmware).  Otherwise we have no
+	 * idea what the current output voltage is, which will confuse
+	 * the regulator framework.
+	 */
+	reg = sypwr_read(sc, SY8106A_VOUT1_SEL);
+	if (reg & SY8106A_VOUT1_SEL_I2C) {
+		uint32_t voltage;
+
+		voltage = sypwr_get_voltage(sc);
+		printf(": %d.%02d VDC", voltage / 1000000,
+		    (voltage % 1000000) / 10000);
+
+		sc->sc_rd.rd_node = node;
+		sc->sc_rd.rd_cookie = sc;
+		sc->sc_rd.rd_get_voltage = sypwr_get_voltage;
+		sc->sc_rd.rd_set_voltage = sypwr_set_voltage;
+		regulator_register(&sc->sc_rd);
+	}
+
+	printf("\n");
+}
+
+uint8_t
+sypwr_read(struct sypwr_softc *sc, int reg)
+{
+	uint8_t cmd = reg;
+	uint8_t val;
+	int error;
+
+	iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
+	error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
+	    &cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL);
+	iic_release_bus(sc->sc_tag, I2C_F_POLL);
+
+	if (error) {
+		printf("error %d\n", error);
+		printf("%s: can't read register 0x%02x\n",
+		    sc->sc_dev.dv_xname, reg);
+		val = 0xff;
+	}
+
+	return val;
+}
+
+void
+sypwr_write(struct sypwr_softc *sc, int reg, uint8_t val)
+{
+	uint8_t cmd = reg;
+	int error;
+
+	iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
+	error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
+	    &cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL);
+	iic_release_bus(sc->sc_tag, I2C_F_POLL);
+
+	if (error) {
+		printf("%s: can't write register 0x%02x\n",
+		    sc->sc_dev.dv_xname, reg);
+	}
+}
+
+uint32_t
+sypwr_get_voltage(void *cookie)
+{
+	struct sypwr_softc *sc = cookie;
+	uint8_t value;
+	
+	value = sypwr_read(sc, SY8106A_VOUT1_SEL);
+	return 680000 + (value & SY8106A_VOUT1_SEL_MASK) * 10000;
+}
+
+int
+sypwr_set_voltage(void *cookie, uint32_t voltage)
+{
+	struct sypwr_softc *sc = cookie;
+	uint8_t value;
+
+	if (voltage < 680000 || voltage > 1950000)
+		return EINVAL;
+
+	value = (voltage - 680000) / 10000;
+	sypwr_write(sc, SY8106A_VOUT1_SEL, value | SY8106A_VOUT1_SEL_I2C);
+	return 0;
+}