From: kettenis <kettenis@openbsd.org>
Date: Thu, 25 Aug 2022 19:16:29 +0000 (+0000)
Subject: The "Avalanche" performance cores on Apple's M2 SoC have more than 16
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=b8e1a447239655249a804c27d3ea32c5fb83941c;p=openbsd

The "Avalanche" performance cores on Apple's M2 SoC have more than 16
P-states.  As a result the layout of the "state" register changed.
Make the driver handle that.

Also make sure we use the correct lowest state in case the lowest
frequency of the performance cores is different from the lowest
frequency of the efficiency cores.

ok tobhe@
---

diff --git a/sys/arch/arm64/dev/aplcpu.c b/sys/arch/arm64/dev/aplcpu.c
index d2c8638bb6f..f6ce7cd3fba 100644
--- a/sys/arch/arm64/dev/aplcpu.c
+++ b/sys/arch/arm64/dev/aplcpu.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: aplcpu.c,v 1.2 2022/05/26 23:32:18 kettenis Exp $	*/
+/*	$OpenBSD: aplcpu.c,v 1.3 2022/08/25 19:16:29 kettenis Exp $	*/
 /*
  * Copyright (c) 2022 Mark Kettenis <kettenis@openbsd.org>
  *
@@ -31,14 +31,16 @@
 #define DVFS_CMD			0x0020
 #define DVFS_CMD_BUSY			(1U << 31)
 #define DVFS_CMD_SET			(1 << 25)
-#define DVFS_CMD_PS2_MASK		(0xf << 12)
+#define DVFS_CMD_PS2_MASK		(0x1f << 12)
 #define DVFS_CMD_PS2_SHIFT		12
-#define DVFS_CMD_PS1_MASK		(0xf << 0)
+#define DVFS_CMD_PS1_MASK		(0x1f << 0)
 #define DVFS_CMD_PS1_SHIFT		0
 
 #define DVFS_STATUS			0x50
-#define DVFS_STATUS_CUR_PS_MASK		(0xf << 4)
-#define DVFS_STATUS_CUR_PS_SHIFT	4
+#define DVFS_T8103_STATUS_CUR_PS_MASK	(0xf << 4)
+#define DVFS_T8103_STATUS_CUR_PS_SHIFT	4
+#define DVFS_T8112_STATUS_CUR_PS_MASK	(0x1f << 5)
+#define DVFS_T8112_STATUS_CUR_PS_SHIFT	5
 
 struct opp {
 	uint64_t opp_hz;
@@ -67,6 +69,9 @@ struct aplcpu_softc {
 	u_int			sc_nclusters;
 	int			sc_perflevel;
 
+	uint32_t		sc_cur_ps_mask;
+	u_int			sc_cur_ps_shift;
+
 	LIST_HEAD(, opp_table)	sc_opp_tables;
 	struct opp_table	*sc_opp_table[APLCPU_MAX_CLUSTERS];
 	uint64_t		sc_opp_hz_min;
@@ -90,6 +95,7 @@ struct cfdriver aplcpu_cd = {
 };
 
 void	aplcpu_opp_init(struct aplcpu_softc *, int);
+uint32_t aplcpu_opp_level(struct aplcpu_softc *, int);
 int	aplcpu_clockspeed(int *);
 void	aplcpu_setperf(int level);
 void	aplcpu_refresh_sensors(void *);
@@ -138,6 +144,14 @@ aplcpu_attach(struct device *parent, struct device *self, void *aux)
 	sc->sc_node = faa->fa_node;
 	sc->sc_nclusters = faa->fa_nreg;
 
+	if (OF_is_compatible(sc->sc_node, "apple,t8103-soc-cpufreq")) {
+		sc->sc_cur_ps_mask = DVFS_T8103_STATUS_CUR_PS_MASK;
+		sc->sc_cur_ps_shift = DVFS_T8103_STATUS_CUR_PS_SHIFT;
+	} else if (OF_is_compatible(sc->sc_node, "apple,t8112-soc-cpufreq")) {
+		sc->sc_cur_ps_mask = DVFS_T8112_STATUS_CUR_PS_MASK;
+		sc->sc_cur_ps_shift = DVFS_T8112_STATUS_CUR_PS_SHIFT;
+	}
+
 	sc->sc_opp_hz_min = UINT64_MAX;
 	sc->sc_opp_hz_max = 0;
 
@@ -253,13 +267,33 @@ aplcpu_opp_init(struct aplcpu_softc *sc, int node)
 		sc->sc_opp_hz_max = ot->ot_opp_hz_max;
 }
 
+uint32_t
+aplcpu_opp_level(struct aplcpu_softc *sc, int cluster)
+{
+	uint32_t opp_level;
+	uint64_t pstate;
+
+	if (sc->sc_cur_ps_mask) {
+		pstate = bus_space_read_8(sc->sc_iot, sc->sc_ioh[cluster],
+		    DVFS_STATUS);
+		opp_level = (pstate & sc->sc_cur_ps_mask);
+		opp_level >>= sc->sc_cur_ps_shift;
+	} else {
+		pstate = bus_space_read_8(sc->sc_iot, sc->sc_ioh[cluster],
+		    DVFS_CMD);
+		opp_level = (pstate & DVFS_CMD_PS1_MASK);
+		opp_level >>= DVFS_CMD_PS1_SHIFT;
+	}
+
+	return opp_level;
+}
+
 int
 aplcpu_clockspeed(int *freq)
 {
 	struct aplcpu_softc *sc = aplcpu_sc;
 	struct opp_table *ot;
 	uint32_t opp_hz = 0, opp_level;
-	uint64_t pstate;
 	int i, j;
 
 	/*
@@ -271,10 +305,7 @@ aplcpu_clockspeed(int *freq)
 		if (sc->sc_opp_table[i] == NULL)
 			continue;
 
-		pstate = bus_space_read_8(sc->sc_iot, sc->sc_ioh[i],
-		    DVFS_STATUS);
-		opp_level = (pstate & DVFS_STATUS_CUR_PS_MASK);
-		opp_level >>= DVFS_STATUS_CUR_PS_SHIFT;
+		opp_level = aplcpu_opp_level(sc, i);
 
 		/* Translate P-state to frequency. */
 		ot = sc->sc_opp_table[i];
@@ -324,7 +355,7 @@ aplcpu_setperf(int level)
 			continue;
 
 		/* Translate performance level to a P-state. */
-		opp_level = 0;
+		opp_level = 1;
 		ot = sc->sc_opp_table[i];
 		for (j = 0; j < ot->ot_nopp; j++) {
 			if (ot->ot_opp[j].opp_hz <= level_hz &&
@@ -361,17 +392,13 @@ aplcpu_refresh_sensors(void *arg)
 	struct aplcpu_softc *sc = arg;
 	struct opp_table *ot;
 	uint32_t opp_level;
-	uint64_t pstate;
 	int i, j;
 
 	for (i = 0; i < sc->sc_nclusters; i++) {
 		if (sc->sc_opp_table[i] == NULL)
 			continue;
 
-		pstate = bus_space_read_8(sc->sc_iot, sc->sc_ioh[i],
-		    DVFS_STATUS);
-		opp_level = (pstate & DVFS_STATUS_CUR_PS_MASK);
-		opp_level >>= DVFS_STATUS_CUR_PS_SHIFT;
+		opp_level = aplcpu_opp_level(sc, i);
 
 		/* Translate P-state to frequency. */
 		ot = sc->sc_opp_table[i];