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 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@nxp.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230403222302.328262-1-shenwei.wang@nxp.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/hwif.c

@@ -87,6 +87,19 @@ static int stmmac_dwxlgmac_quirks(struct stmmac_priv *priv)
 	return 0;
 }
 
+int stmmac_reset(struct stmmac_priv *priv, void __iomem *ioaddr)
+{
+	struct plat_stmmacenet_data *plat = priv ? priv->plat : NULL;
+
+	if (!priv)
+		return -EINVAL;
+
+	if (plat && plat->fix_soc_reset)
+		return plat->fix_soc_reset(plat, ioaddr);
+
+	return stmmac_do_callback(priv, dma, reset, ioaddr);
+}
+
 static const struct stmmac_hwif_entry {
 	bool gmac;
 	bool gmac4;

drivers/net/ethernet/stmicro/stmmac/hwif.h

@@ -214,8 +214,6 @@ struct stmmac_dma_ops {
 	int (*enable_tbs)(void __iomem *ioaddr, bool en, u32 chan);
 };
 
-#define stmmac_reset(__priv, __args...) \
-	stmmac_do_callback(__priv, dma, reset, __args)
 #define stmmac_dma_init(__priv, __args...) \
 	stmmac_do_void_callback(__priv, dma, init, __args)
 #define stmmac_init_chan(__priv, __args...) \
@@ -640,6 +638,7 @@ extern const struct stmmac_mmc_ops dwxgmac_mmc_ops;
 #define GMAC_VERSION		0x00000020	/* GMAC CORE Version */
 #define GMAC4_VERSION		0x00000110	/* GMAC4+ CORE Version */
 
+int stmmac_reset(struct stmmac_priv *priv, void __iomem *ioaddr);
 int stmmac_hwif_init(struct stmmac_priv *priv);
 
 #endif /* __STMMAC_HWIF_H__ */

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);