Add rkiovd(4), a driver for the IO voltage domains on Rockchip SoCs. This

driver makes sure the SoC IO voltage domains stay in sync with the voltage
provided by the regulator associated with the domain.

ok dlg@

diff --git a/sys/dev/fdt/files.fdt b/sys/dev/fdt/files.fdt
index 0546228..9d79582 100644 (file)
--- a/sys/dev/fdt/files.fdt
+++ b/sys/dev/fdt/files.fdt
@@ -1,4 +1,4 @@
-#      $OpenBSD: files.fdt,v 1.182 2023/03/19 11:17:16 kettenis Exp $
+#      $OpenBSD: files.fdt,v 1.183 2023/04/01 08:39:05 kettenis Exp $
 #
 # Config file and device description for machine-independent FDT code.
 # Included by ports that need it.
@@ -378,6 +378,10 @@ device     rkiis
 attach rkiis at fdt
 file   dev/fdt/rkiis.c                 rkiis
 
+device rkiovd
+attach rkiovd at fdt
+file   dev/fdt/rkiovd.c                rkiovd
+
 device rkpcie: pcibus
 attach rkpcie at fdt
 file   dev/fdt/rkpcie.c                rkpcie

diff --git a/sys/dev/fdt/rkiovd.c b/sys/dev/fdt/rkiovd.c
new file mode 100644 (file)
index 0000000..9937477
--- /dev/null
+++ b/sys/dev/fdt/rkiovd.c
@@ -0,0 +1,170 @@
+/*     $OpenBSD: rkiovd.c,v 1.1 2023/04/01 08:39:05 kettenis Exp $     */
+/*
+ * Copyright (c) 2023 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 <machine/intr.h>
+#include <machine/bus.h>
+#include <machine/fdt.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_misc.h>
+#include <dev/ofw/ofw_regulator.h>
+#include <dev/ofw/fdt.h>
+
+#define RK3568_PMU_GRF_IO_VSEL0                0x0140
+#define RK3568_PMU_GRF_IO_VSEL1                0x0144
+#define RK3568_PMU_GRF_IO_VSEL2                0x0148
+
+#define RKIOVD_MAX_DOMAINS     9
+
+const char *rkiovd_rk3568_domains[] = {
+       "pmuio1-supply",
+       "pmuio2-supply",
+       "vccio1-supply",
+       "vccio2-supply",
+       "vccio3-supply",
+       "vccio4-supply",
+       "vccio5-supply",
+       "vccio6-supply",
+       "vccio7-supply",
+       NULL
+};
+
+struct rkiovd_domain {
+       struct rkiovd_softc     *rd_sc;
+       int                     rd_idx;
+       struct regulator_notifier rd_rn;
+};
+
+struct rkiovd_softc {
+       struct device           sc_dv;
+       struct regmap           *sc_rm;
+       struct rkiovd_domain    sc_rd[RKIOVD_MAX_DOMAINS];
+};
+
+int    rkiovd_match(struct device *, void *, void *);
+void   rkiovd_attach(struct device *, struct device *, void *);
+
+const struct cfattach rkiovd_ca = {
+       sizeof (struct rkiovd_softc), rkiovd_match, rkiovd_attach
+};
+
+struct cfdriver rkiovd_cd = {
+       NULL, "rkiovd", DV_DULL
+};
+
+void   rkiovd_rk3568_notify(void *, uint32_t);
+
+int
+rkiovd_match(struct device *parent, void *match, void *aux)
+{
+       struct fdt_attach_args *faa = aux;
+
+       return OF_is_compatible(faa->fa_node,
+           "rockchip,rk3568-pmu-io-voltage-domain");
+}
+
+void
+rkiovd_attach(struct device *parent, struct device *self, void *aux)
+{
+       struct rkiovd_softc *sc = (struct rkiovd_softc *)self;
+       struct fdt_attach_args *faa = aux;
+       int idx;
+
+       printf("\n");
+
+       sc->sc_rm = regmap_bynode(OF_parent(faa->fa_node));
+       if (sc->sc_rm == NULL)
+               return;
+
+       for (idx = 0; rkiovd_rk3568_domains[idx]; idx++) {
+               struct rkiovd_domain *rd = &sc->sc_rd[idx];
+               char *name = (char *)rkiovd_rk3568_domains[idx];
+               uint32_t phandle;
+
+               phandle = OF_getpropint(faa->fa_node, name, 0);
+               if (phandle == 0)
+                       continue;
+
+               rd->rd_sc = sc;
+               rd->rd_idx = idx;
+               rd->rd_rn.rn_phandle = phandle;
+               rd->rd_rn.rn_cookie = rd;
+               rd->rd_rn.rn_notify = rkiovd_rk3568_notify;
+               regulator_notify(&rd->rd_rn);
+       }
+}
+
+void
+rkiovd_rk3568_notify(void *cookie, uint32_t voltage)
+{
+       struct rkiovd_domain *rd = cookie;
+       struct rkiovd_softc *sc = rd->rd_sc;
+       uint32_t current_voltage;
+       uint32_t vsel0, vsel1;
+       int bit;
+
+       /*
+        * If the new voltage is higher than the current voltage we
+        * need to configure the I/O voltage domain before changing
+        * the voltage.  If the new voltage is lower we need to
+        * configure the domain after changing the voltage.  Using the
+        * maximum of the new and current voltage makes sure this is
+        * always the case.
+        */
+       current_voltage = regulator_get_voltage(rd->rd_rn.rn_phandle);
+       if (voltage < current_voltage)
+               voltage = current_voltage;
+
+       switch (rd->rd_idx) {
+       case 1:                 /* PMUIO2 */
+               if (voltage > 1980000) {
+                       vsel0 = (1 << 1) << 16 | (0 << 1);
+                       vsel1 = (1 << 5) << 16 | (1 << 5);
+               } else {
+                       vsel0 = (1 << 1) << 16 | (1 << 1);
+                       vsel1 = (1 << 5) << 16 | (0 << 5);
+               }
+               regmap_write_4(sc->sc_rm, RK3568_PMU_GRF_IO_VSEL2, vsel0);
+               regmap_write_4(sc->sc_rm, RK3568_PMU_GRF_IO_VSEL2, vsel1);
+               break;
+       case 2:                 /* VCCIO1 */
+       case 4:                 /* VCCIO3 */
+       case 5:                 /* VCCIO4 */
+       case 6:                 /* VCCIO5 */
+       case 7:                 /* VCCIO6 */
+       case 8:                 /* VCCIO7 */
+               bit = rd->rd_idx - 1;
+               if (voltage > 1980000) {
+                       vsel0 = (1 << bit) << 16 | (0 << bit);
+                       vsel1 = (1 << bit) << 16 | (1 << bit);
+               } else {
+                       vsel0 = (1 << bit) << 16 | (1 << bit);
+                       vsel1 = (1 << bit) << 16 | (0 << bit);
+               }
+               regmap_write_4(sc->sc_rm, RK3568_PMU_GRF_IO_VSEL0, vsel0);
+               regmap_write_4(sc->sc_rm, RK3568_PMU_GRF_IO_VSEL1, vsel1);
+               break;
+       case 0:                 /* PMUIO1 */
+       case 3:                 /* VCCIO2 */
+               /* Ignore */
+               break;
+       }
+}