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From:   Markus Schneider-Pargmann <msp@baylibre.com>
To:     Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>
Cc:     Chun-Jie Chen <chun-jie.chen@mediatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Tinghan Shen <tinghan.shen@mediatek.com>,
        Fabien Parent <parent.f@gmail.com>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org,
        Alexandre Bailon <abailon@baylibre.com>,
        Fabien Parent <fparent@baylibre.com>,
        Markus Schneider-Pargmann <msp@baylibre.com>
Subject: [PATCH v5 6/8] soc: mediatek: Add support for WAY_EN operations
Date:   Mon, 19 Jun 2023 10:53:42 +0200
Message-Id: <20230619085344.2885311-7-msp@baylibre.com>
In-Reply-To: <20230619085344.2885311-1-msp@baylibre.com>
References: <20230619085344.2885311-1-msp@baylibre.com>
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From: Alexandre Bailon <abailon@baylibre.com>

This updates the power domain to support WAY_EN operations. WAY_EN
operations on mt8365 are using a different component to check for the
acknowledgment, namely the infracfg-nao component. Also to enable a way
it the bit needs to be cleared while disabling a way needs a bit to be
set. To support these two operations two flags are added,
BUS_PROT_INVERTED and BUS_PROT_STA_COMPONENT_INFRA_NAO. Additionally
another regmap is created if the INFRA_NAO capability is set.

This operation is required by the mt8365 for the MM power domain.

Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
Signed-off-by: Fabien Parent <fparent@baylibre.com>
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
 drivers/soc/mediatek/mtk-pm-domains.c | 39 +++++++++++++++++++++++----
 drivers/soc/mediatek/mtk-pm-domains.h |  7 +++--
 2 files changed, 39 insertions(+), 7 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
index 3cdf62c0b6bd..4659f0a0aa08 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.c
+++ b/drivers/soc/mediatek/mtk-pm-domains.c
@@ -44,6 +44,7 @@ struct scpsys_domain {
 	struct clk_bulk_data *clks;
 	int num_subsys_clks;
 	struct clk_bulk_data *subsys_clks;
+	struct regmap *infracfg_nao;
 	struct regmap *infracfg;
 	struct regmap *smi;
 	struct regulator *supply;
@@ -127,13 +128,26 @@ static struct regmap *scpsys_bus_protect_get_regmap(struct scpsys_domain *pd,
 		return pd->infracfg;
 }
 
+static struct regmap *scpsys_bus_protect_get_sta_regmap(struct scpsys_domain *pd,
+							const struct scpsys_bus_prot_data *bpd)
+{
+	if (bpd->flags & BUS_PROT_STA_COMPONENT_INFRA_NAO)
+		return pd->infracfg_nao;
+	else
+		return scpsys_bus_protect_get_regmap(pd, bpd);
+}
+
 static int scpsys_bus_protect_clear(struct scpsys_domain *pd,
 				    const struct scpsys_bus_prot_data *bpd)
 {
+	struct regmap *sta_regmap = scpsys_bus_protect_get_sta_regmap(pd, bpd);
 	struct regmap *regmap = scpsys_bus_protect_get_regmap(pd, bpd);
+	u32 expected_ack;
 	u32 val;
 	u32 sta_mask = bpd->bus_prot_sta_mask;
 
+	expected_ack = (bpd->flags & BUS_PROT_STA_COMPONENT_INFRA_NAO ? sta_mask : 0);
+
 	if (bpd->flags & BUS_PROT_REG_UPDATE)
 		regmap_clear_bits(regmap, bpd->bus_prot_clr, bpd->bus_prot_set_clr_mask);
 	else
@@ -142,14 +156,15 @@ static int scpsys_bus_protect_clear(struct scpsys_domain *pd,
 	if (bpd->flags & BUS_PROT_IGNORE_CLR_ACK)
 		return 0;
 
-	return regmap_read_poll_timeout(regmap, bpd->bus_prot_sta,
-					val, !(val & sta_mask),
+	return regmap_read_poll_timeout(sta_regmap, bpd->bus_prot_sta,
+					val, (val & sta_mask) == expected_ack,
 					MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
 }
 
 static int scpsys_bus_protect_set(struct scpsys_domain *pd,
 				  const struct scpsys_bus_prot_data *bpd)
 {
+	struct regmap *sta_regmap = scpsys_bus_protect_get_sta_regmap(pd, bpd);
 	struct regmap *regmap = scpsys_bus_protect_get_regmap(pd, bpd);
 	u32 val;
 	u32 sta_mask = bpd->bus_prot_sta_mask;
@@ -159,7 +174,7 @@ static int scpsys_bus_protect_set(struct scpsys_domain *pd,
 	else
 		regmap_write(regmap, bpd->bus_prot_set, bpd->bus_prot_set_clr_mask);
 
-	return regmap_read_poll_timeout(regmap, bpd->bus_prot_sta,
+	return regmap_read_poll_timeout(sta_regmap, bpd->bus_prot_sta,
 					val, (val & sta_mask) == sta_mask,
 					MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
 }
@@ -173,7 +188,10 @@ static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
 		if (!bpd->bus_prot_set_clr_mask)
 			break;
 
-		ret = scpsys_bus_protect_set(pd, bpd);
+		if (bpd->flags & BUS_PROT_INVERTED)
+			ret = scpsys_bus_protect_clear(pd, bpd);
+		else
+			ret = scpsys_bus_protect_set(pd, bpd);
 		if (ret)
 			return ret;
 	}
@@ -190,7 +208,10 @@ static int scpsys_bus_protect_disable(struct scpsys_domain *pd)
 		if (!bpd->bus_prot_set_clr_mask)
 			continue;
 
-		ret = scpsys_bus_protect_clear(pd, bpd);
+		if (bpd->flags & BUS_PROT_INVERTED)
+			ret = scpsys_bus_protect_set(pd, bpd);
+		else
+			ret = scpsys_bus_protect_clear(pd, bpd);
 		if (ret)
 			return ret;
 	}
@@ -377,6 +398,14 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
 			return ERR_CAST(pd->smi);
 	}
 
+	pd->infracfg_nao = syscon_regmap_lookup_by_phandle(node, "mediatek,infracfg-nao");
+	if (IS_ERR(pd->infracfg_nao)) {
+		if (MTK_SCPD_CAPS(pd, MTK_SCPD_HAS_INFRA_NAO))
+			return ERR_CAST(pd->infracfg_nao);
+
+		pd->infracfg_nao = NULL;
+	}
+
 	num_clks = of_clk_get_parent_count(node);
 	if (num_clks > 0) {
 		/* Calculate number of subsys_clks */
diff --git a/drivers/soc/mediatek/mtk-pm-domains.h b/drivers/soc/mediatek/mtk-pm-domains.h
index 356788263db2..562d4e92ce16 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.h
+++ b/drivers/soc/mediatek/mtk-pm-domains.h
@@ -11,6 +11,7 @@
 /* can't set MTK_SCPD_KEEP_DEFAULT_OFF at the same time */
 #define MTK_SCPD_ALWAYS_ON		BIT(5)
 #define MTK_SCPD_EXT_BUCK_ISO		BIT(6)
+#define MTK_SCPD_HAS_INFRA_NAO		BIT(7)
 #define MTK_SCPD_CAPS(_scpd, _x)	((_scpd)->data->caps & (_x))
 
 #define SPM_VDE_PWR_CON			0x0210
@@ -45,8 +46,10 @@
 enum scpsys_bus_prot_flags {
 	BUS_PROT_REG_UPDATE = BIT(1),
 	BUS_PROT_IGNORE_CLR_ACK = BIT(2),
-	BUS_PROT_COMPONENT_INFRA = BIT(3),
-	BUS_PROT_COMPONENT_SMI = BIT(4),
+	BUS_PROT_INVERTED = BIT(3),
+	BUS_PROT_COMPONENT_INFRA = BIT(4),
+	BUS_PROT_COMPONENT_SMI = BIT(5),
+	BUS_PROT_STA_COMPONENT_INFRA_NAO = BIT(6),
 };
 
 #define _BUS_PROT(_set_clr_mask, _set, _clr, _sta_mask, _sta, _flags) {	\
-- 
2.40.1