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Message-ID: <b983a3adf5184a30e4ce620fbbf028c9c76648ae.1692382239.git.daniel@makrotopia.org>
Date:   Fri, 18 Aug 2023 19:15:24 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Daniel Golle <daniel@...rotopia.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH net] net: ethernet: mtk_eth_soc: add reset bits for MT7988

Add bits needed to reset the frame engine on MT7988.

Fixes: 445eb6448ed3 ("net: ethernet: mtk_eth_soc: add basic support for MT7988 SoC")
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 76 +++++++++++++++------
 drivers/net/ethernet/mediatek/mtk_eth_soc.h | 11 ++-
 2 files changed, 64 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index fe05c90202699..2482f47313085 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -3613,19 +3613,34 @@ static void mtk_hw_reset(struct mtk_eth *eth)
 {
 	u32 val;
 
-	if (mtk_is_netsys_v2_or_greater(eth)) {
+	if (mtk_is_netsys_v2_or_greater(eth))
 		regmap_write(eth->ethsys, ETHSYS_FE_RST_CHK_IDLE_EN, 0);
+
+	if (mtk_is_netsys_v3_or_greater(eth)) {
+		val = RSTCTRL_PPE0_V3;
+
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
+			val |= RSTCTRL_PPE1_V3;
+
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE2))
+			val |= RSTCTRL_PPE2;
+
+		val |= RSTCTRL_WDMA0 | RSTCTRL_WDMA1 | RSTCTRL_WDMA2;
+	} else if (mtk_is_netsys_v2_or_greater(eth)) {
 		val = RSTCTRL_PPE0_V2;
+
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
+			val |= RSTCTRL_PPE1;
 	} else {
 		val = RSTCTRL_PPE0;
 	}
 
-	if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
-		val |= RSTCTRL_PPE1;
-
 	ethsys_reset(eth, RSTCTRL_ETH | RSTCTRL_FE | val);
 
-	if (mtk_is_netsys_v2_or_greater(eth))
+	if (mtk_is_netsys_v3_or_greater(eth))
+		regmap_write(eth->ethsys, ETHSYS_FE_RST_CHK_IDLE_EN,
+			     0x6f8ff);
+	else if (mtk_is_netsys_v2_or_greater(eth))
 		regmap_write(eth->ethsys, ETHSYS_FE_RST_CHK_IDLE_EN,
 			     0x3ffffff);
 }
@@ -3651,13 +3666,21 @@ static void mtk_hw_warm_reset(struct mtk_eth *eth)
 		return;
 	}
 
-	if (mtk_is_netsys_v2_or_greater(eth))
+	if (mtk_is_netsys_v3_or_greater(eth)) {
+		rst_mask = RSTCTRL_ETH | RSTCTRL_PPE0_V3;
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
+			rst_mask |= RSTCTRL_PPE1_V3;
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE2))
+			rst_mask |= RSTCTRL_PPE2;
+
+		rst_mask |= RSTCTRL_WDMA0 | RSTCTRL_WDMA1 | RSTCTRL_WDMA2;
+	} else if (mtk_is_netsys_v2_or_greater(eth)) {
 		rst_mask = RSTCTRL_ETH | RSTCTRL_PPE0_V2;
-	else
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
+			rst_mask |= RSTCTRL_PPE1;
+	} else {
 		rst_mask = RSTCTRL_ETH | RSTCTRL_PPE0;
-
-	if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
-		rst_mask |= RSTCTRL_PPE1;
+	}
 
 	regmap_update_bits(eth->ethsys, ETHSYS_RSTCTRL, rst_mask, rst_mask);
 
@@ -4009,11 +4032,17 @@ static void mtk_prepare_for_reset(struct mtk_eth *eth)
 	u32 val;
 	int i;
 
-	/* disabe FE P3 and P4 */
-	val = mtk_r32(eth, MTK_FE_GLO_CFG) | MTK_FE_LINK_DOWN_P3;
-	if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
-		val |= MTK_FE_LINK_DOWN_P4;
-	mtk_w32(eth, val, MTK_FE_GLO_CFG);
+	/* set FE PPE ports link down */
+	for (i = MTK_GMAC1_ID;
+	     i <= (mtk_is_netsys_v3_or_greater(eth) ? MTK_GMAC3_ID : MTK_GMAC2_ID);
+	     i += 2) {
+		val = mtk_r32(eth, MTK_FE_GLO_CFG(i)) | MTK_FE_LINK_DOWN_P(PSE_PPE0_PORT);
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
+			val |= MTK_FE_LINK_DOWN_P(PSE_PPE1_PORT);
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE2))
+			val |= MTK_FE_LINK_DOWN_P(PSE_PPE2_PORT);
+		mtk_w32(eth, val, MTK_FE_GLO_CFG(i));
+	}
 
 	/* adjust PPE configurations to prepare for reset */
 	for (i = 0; i < ARRAY_SIZE(eth->ppe); i++)
@@ -4074,11 +4103,18 @@ static void mtk_pending_work(struct work_struct *work)
 		}
 	}
 
-	/* enabe FE P3 and P4 */
-	val = mtk_r32(eth, MTK_FE_GLO_CFG) & ~MTK_FE_LINK_DOWN_P3;
-	if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
-		val &= ~MTK_FE_LINK_DOWN_P4;
-	mtk_w32(eth, val, MTK_FE_GLO_CFG);
+	/* set FE PPE ports link up */
+	for (i = MTK_GMAC1_ID;
+	     i <= (mtk_is_netsys_v3_or_greater(eth) ? MTK_GMAC3_ID : MTK_GMAC2_ID);
+	     i += 2) {
+		val = mtk_r32(eth, MTK_FE_GLO_CFG(i)) & ~MTK_FE_LINK_DOWN_P(PSE_PPE0_PORT);
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
+			val &= ~MTK_FE_LINK_DOWN_P(PSE_PPE1_PORT);
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE2))
+			val &= ~MTK_FE_LINK_DOWN_P(PSE_PPE2_PORT);
+
+		mtk_w32(eth, val, MTK_FE_GLO_CFG(i));
+	}
 
 	clear_bit(MTK_RESETTING, &eth->state);
 
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 8d2d35b322351..bb4313c92fae0 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -76,9 +76,8 @@
 #define	MTK_HW_LRO_SDL_REMAIN_ROOM	1522
 
 /* Frame Engine Global Configuration */
-#define MTK_FE_GLO_CFG		0x00
-#define MTK_FE_LINK_DOWN_P3	BIT(11)
-#define MTK_FE_LINK_DOWN_P4	BIT(12)
+#define MTK_FE_GLO_CFG(x)	(((x) == MTK_GMAC3_ID) ? 0x24 : 0x00)
+#define MTK_FE_LINK_DOWN_P(x)	BIT(((x) + 8) % 16)
 
 /* Frame Engine Global Reset Register */
 #define MTK_RST_GL		0x04
@@ -522,9 +521,15 @@
 /* ethernet reset control register */
 #define ETHSYS_RSTCTRL			0x34
 #define RSTCTRL_FE			BIT(6)
+#define RSTCTRL_WDMA0			BIT(24)
+#define RSTCTRL_WDMA1			BIT(25)
+#define RSTCTRL_WDMA2			BIT(26)
 #define RSTCTRL_PPE0			BIT(31)
 #define RSTCTRL_PPE0_V2			BIT(30)
 #define RSTCTRL_PPE1			BIT(31)
+#define RSTCTRL_PPE0_V3			BIT(29)
+#define RSTCTRL_PPE1_V3			BIT(30)
+#define RSTCTRL_PPE2			BIT(31)
 #define RSTCTRL_ETH			BIT(23)
 
 /* ethernet reset check idle register */
-- 
2.41.0

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