netdev - [PATCH 1/1] net: stmmac: add support for platform specific reset

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Message-Id: <20230321190921.3113971-1-shenwei.wang@nxp.com>
Date:   Tue, 21 Mar 2023 14:09:20 -0500
From:   Shenwei Wang <shenwei.wang@....com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        NXP Linux Team <linux-imx@....com>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Wong Vee Khee <veekhee@...le.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Mohammad Athari Bin Ismail <mohammad.athari.ismail@...el.com>,
        Andrey Konovalov <andrey.konovalov@...aro.org>,
        Revanth Kumar Uppala <ruppala@...dia.com>,
        Tan Tee Min <tee.min.tan@...ux.intel.com>,
        Shenwei Wang <shenwei.wang@....com>, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, imx@...ts.linux.dev
Subject: [PATCH 1/1] net: stmmac: add support for platform specific reset

This patch adds support for platform-specific reset logic in the
stmmac driver. Some SoCs require a different reset mechanism than
the standard dwmac IP reset. To support these platforms, a new function
pointer 'fix_soc_reset' is added to the plat_stmmacenet_data structure.
The stmmac_reset macro in hwif.h is modified to call the 'fix_soc_reset'
function if it exists. This enables the driver to use the platform-specific
reset logic when necessary.

Signed-off-by: Shenwei Wang <shenwei.wang@....com>
---
 drivers/net/ethernet/stmicro/stmmac/hwif.h | 10 +++++++++-
 include/linux/stmmac.h                     |  1 +
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index 16a7421715cb..e24ce870690e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -215,7 +215,15 @@ struct stmmac_dma_ops {
 };
 
 #define stmmac_reset(__priv, __args...) \
-	stmmac_do_callback(__priv, dma, reset, __args)
+({ \
+	int __result = -EINVAL; \
+	if ((__priv) && (__priv)->plat && (__priv)->plat->fix_soc_reset) { \
+		__result = (__priv)->plat->fix_soc_reset((__priv)->plat, ##__args); \
+	} else { \
+		__result = stmmac_do_callback(__priv, dma, reset, __args); \
+	} \
+	__result; \
+})
 #define stmmac_dma_init(__priv, __args...) \
 	stmmac_do_void_callback(__priv, dma, init, __args)
 #define stmmac_init_chan(__priv, __args...) \
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index a152678b82b7..9044477fad61 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -223,6 +223,7 @@ struct plat_stmmacenet_data {
 	struct stmmac_rxq_cfg rx_queues_cfg[MTL_MAX_RX_QUEUES];
 	struct stmmac_txq_cfg tx_queues_cfg[MTL_MAX_TX_QUEUES];
 	void (*fix_mac_speed)(void *priv, unsigned int speed);
+	int (*fix_soc_reset)(void *priv, void __iomem *ioaddr);
 	int (*serdes_powerup)(struct net_device *ndev, void *priv);
 	void (*serdes_powerdown)(struct net_device *ndev, void *priv);
 	void (*speed_mode_2500)(struct net_device *ndev, void *priv);
-- 
2.34.1