From 6673e64ffa833d9954548fda7fcc0f3ed054f14f Mon Sep 17 00:00:00 2001
From: patrick <patrick@openbsd.org>
Date: Tue, 8 Nov 2022 19:40:08 +0000
Subject: [PATCH] Add qcpmic(4), a driver for the SPMI-connected PMICs found on
 Qualcomm SoCs, which are used on the Lenovo x13s.

This is mostly a shim.  The work for the actual blocks inside the PMICs
occurs in the children.

ok kettenis@
---
 sys/dev/fdt/qcpmic.c | 124 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 sys/dev/fdt/qcpmic.c

diff --git a/sys/dev/fdt/qcpmic.c b/sys/dev/fdt/qcpmic.c
new file mode 100644
index 00000000000..3a93fd5b86a
--- /dev/null
+++ b/sys/dev/fdt/qcpmic.c
@@ -0,0 +1,124 @@
+/*	$OpenBSD: qcpmic.c,v 1.1 2022/11/08 19:40:08 patrick Exp $	*/
+/*
+ * Copyright (c) 2022 Patrick Wildt <patrick@blueri.se>
+ *
+ * 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/malloc.h>
+#include <sys/systm.h>
+#include <sys/timeout.h>
+
+#include <machine/bus.h>
+#include <machine/fdt.h>
+
+#include <dev/fdt/spmivar.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_clock.h>
+#include <dev/ofw/ofw_power.h>
+#include <dev/ofw/fdt.h>
+
+/* PMIC Registers. */
+#define PMIC_REV2	0x101
+#define PMIC_REV3	0x102
+#define PMIC_REV4	0x103
+#define PMIC_TYPE	0x104
+#define  PMIC_TYPE_VAL		0x51
+#define PMIC_SUBTYPE	0x105
+#define PMIC_FAB_ID	0x1f2
+
+struct qcpmic_softc {
+	struct device		sc_dev;
+	int			sc_node;
+
+	spmi_tag_t		sc_tag;
+	int8_t			sc_sid;
+
+	void			*sc_ih;
+
+	struct timeout		sc_tick;
+};
+
+int	qcpmic_match(struct device *, void *, void *);
+void	qcpmic_attach(struct device *, struct device *, void *);
+
+const struct cfattach qcpmic_ca = {
+	sizeof(struct qcpmic_softc), qcpmic_match, qcpmic_attach
+};
+
+struct cfdriver qcpmic_cd = {
+	NULL, "qcpmic", DV_DULL
+};
+
+uint8_t	qcpmic_read(struct qcpmic_softc *, uint16_t);
+
+int
+qcpmic_match(struct device *parent, void *match, void *aux)
+{
+	struct spmi_attach_args *saa = aux;
+
+	return OF_is_compatible(saa->sa_node, "qcom,spmi-pmic");
+}
+
+void
+qcpmic_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct spmi_attach_args *saa = aux;
+	struct qcpmic_softc *sc = (struct qcpmic_softc *)self;
+	struct spmi_attach_args sa;
+	char name[32];
+	int node;
+
+	sc->sc_node = saa->sa_node;
+	sc->sc_tag = saa->sa_tag;
+	sc->sc_sid = saa->sa_sid;
+
+	if (qcpmic_read(sc, PMIC_TYPE) != PMIC_TYPE_VAL) {
+		printf(": unknown PMIC type\n");
+		return;
+	}
+
+	printf("\n");
+
+	for (node = OF_child(saa->sa_node); node; node = OF_peer(node)) {
+		memset(name, 0, sizeof(name));
+		if (OF_getprop(node, "compatible", name, sizeof(name)) == -1)
+			continue;
+		if (name[0] == '\0')
+			continue;
+
+		memset(&sa, 0, sizeof(sa));
+		sa.sa_tag = sc->sc_tag;
+		sa.sa_sid = sc->sc_sid;
+		sa.sa_name = name;
+		sa.sa_node = node;
+		config_found(self, &sa, NULL);
+	}
+}
+
+uint8_t
+qcpmic_read(struct qcpmic_softc *sc, uint16_t addr)
+{
+	uint8_t reg = 0;
+	int err;
+
+	err = spmi_cmd_read(sc->sc_tag, sc->sc_sid, SPMI_CMD_EXT_READL,
+	    addr, &reg, sizeof(reg));
+	if (err)
+		printf("%s: error (%u) reading 0x%x\n", sc->sc_dev.dv_xname,
+		    err, addr);
+
+	return reg;
+}
-- 
2.20.1