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Message-Id: <20230525101126.370108-3-maxime.chevallier@bootlin.com> Date: Thu, 25 May 2023 12:11:24 +0200 From: Maxime Chevallier <maxime.chevallier@...tlin.com> To: Mark Brown <broonie@...nel.org>, davem@...emloft.net Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, alexis.lothore@...tlin.com, thomas.petazzoni@...tlin.com, Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Florian Fainelli <f.fainelli@...il.com>, Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, Vladimir Oltean <vladimir.oltean@....com>, Ioana Ciornei <ioana.ciornei@....com>, linux-stm32@...md-mailman.stormreply.com, linux-arm-kernel@...ts.infradead.org, Maxime Coquelin <mcoquelin.stm32@...il.com>, Jose Abreu <joabreu@...opsys.com>, Alexandre Torgue <alexandre.torgue@...s.st.com>, Giuseppe Cavallaro <peppe.cavallaro@...com> Subject: [PATCH net-next v2 2/4] net: ethernet: altera-tse: Convert to mdio-regmap and use PCS Lynx The newly introduced regmap-based MDIO driver allows for an easy mapping of an mdiodevice onto the memory-mapped TSE PCS, which is actually a Lynx PCS. Convert Altera TSE to use this PCS instead of the pcs-altera-tse, which is nothing more than a memory-mapped Lynx PCS. Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com> --- V1->V2 : No changes drivers/net/ethernet/altera/altera_tse.h | 1 + drivers/net/ethernet/altera/altera_tse_main.c | 57 +++++++++++++++++-- include/linux/mdio/mdio-regmap.h | 2 + 3 files changed, 54 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/altera/altera_tse.h b/drivers/net/ethernet/altera/altera_tse.h index db5eed06e92d..d50cf440d01b 100644 --- a/drivers/net/ethernet/altera/altera_tse.h +++ b/drivers/net/ethernet/altera/altera_tse.h @@ -477,6 +477,7 @@ struct altera_tse_private { struct phylink *phylink; struct phylink_config phylink_config; struct phylink_pcs *pcs; + struct mdio_device *pcs_mdiodev; }; /* Function prototypes diff --git a/drivers/net/ethernet/altera/altera_tse_main.c b/drivers/net/ethernet/altera/altera_tse_main.c index 190ff1bcd94e..66db6a7d0b22 100644 --- a/drivers/net/ethernet/altera/altera_tse_main.c +++ b/drivers/net/ethernet/altera/altera_tse_main.c @@ -27,14 +27,16 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/mii.h> +#include <linux/mdio/mdio-regmap.h> #include <linux/netdevice.h> #include <linux/of_device.h> #include <linux/of_mdio.h> #include <linux/of_net.h> #include <linux/of_platform.h> -#include <linux/pcs-altera-tse.h> +#include <linux/pcs-lynx.h> #include <linux/phy.h> #include <linux/platform_device.h> +#include <linux/regmap.h> #include <linux/skbuff.h> #include <asm/cacheflush.h> @@ -1134,13 +1136,21 @@ static int altera_tse_probe(struct platform_device *pdev) const struct of_device_id *of_id = NULL; struct altera_tse_private *priv; struct resource *control_port; + struct regmap *pcs_regmap; struct resource *dma_res; struct resource *pcs_res; + struct mii_bus *pcs_bus; struct net_device *ndev; void __iomem *descmap; - int pcs_reg_width = 2; int ret = -ENODEV; + struct regmap_config pcs_regmap_cfg; + + struct mdio_regmap_config mrc = { + .parent = &pdev->dev, + .valid_addr = 0x0, + }; + ndev = alloc_etherdev(sizeof(struct altera_tse_private)); if (!ndev) { dev_err(&pdev->dev, "Could not allocate network device\n"); @@ -1258,10 +1268,29 @@ static int altera_tse_probe(struct platform_device *pdev) ret = request_and_map(pdev, "pcs", &pcs_res, &priv->pcs_base); if (ret) { + /* If we can't find a dedicated resource for the PCS, fallback + * to the internal PCS, that has a different address stride + */ priv->pcs_base = priv->mac_dev + tse_csroffs(mdio_phy0); - pcs_reg_width = 4; + pcs_regmap_cfg.reg_bits = 32; + /* Values are MDIO-like values, on 16 bits */ + pcs_regmap_cfg.val_bits = 16; + pcs_regmap_cfg.reg_shift = REGMAP_UPSHIFT(2); + } else { + pcs_regmap_cfg.reg_bits = 16; + pcs_regmap_cfg.val_bits = 16; + pcs_regmap_cfg.reg_shift = REGMAP_UPSHIFT(1); } + /* Create a regmap for the PCS so that it can be used by the PCS driver */ + pcs_regmap = devm_regmap_init_mmio(&pdev->dev, priv->pcs_base, + &pcs_regmap_cfg); + if (IS_ERR(pcs_regmap)) { + ret = PTR_ERR(pcs_regmap); + goto err_free_netdev; + } + mrc.regmap = pcs_regmap; + /* Rx IRQ */ priv->rx_irq = platform_get_irq_byname(pdev, "rx_irq"); if (priv->rx_irq == -ENXIO) { @@ -1384,7 +1413,20 @@ static int altera_tse_probe(struct platform_device *pdev) (unsigned long) control_port->start, priv->rx_irq, priv->tx_irq); - priv->pcs = alt_tse_pcs_create(ndev, priv->pcs_base, pcs_reg_width); + snprintf(mrc.name, MII_BUS_ID_SIZE, "%s-pcs-mii", ndev->name); + pcs_bus = devm_mdio_regmap_register(&pdev->dev, &mrc); + if (IS_ERR(pcs_bus)) { + ret = PTR_ERR(pcs_bus); + goto err_init_phy; + } + + priv->pcs_mdiodev = mdio_device_create(pcs_bus, 0); + + priv->pcs = lynx_pcs_create(priv->pcs_mdiodev); + if (!priv->pcs) { + ret = -ENODEV; + goto err_init_phy; + } priv->phylink_config.dev = &ndev->dev; priv->phylink_config.type = PHYLINK_NETDEV; @@ -1407,11 +1449,12 @@ static int altera_tse_probe(struct platform_device *pdev) if (IS_ERR(priv->phylink)) { dev_err(&pdev->dev, "failed to create phylink\n"); ret = PTR_ERR(priv->phylink); - goto err_init_phy; + goto err_pcs; } return 0; - +err_pcs: + mdio_device_free(priv->pcs_mdiodev); err_init_phy: unregister_netdev(ndev); err_register_netdev: @@ -1433,6 +1476,8 @@ static int altera_tse_remove(struct platform_device *pdev) altera_tse_mdio_destroy(ndev); unregister_netdev(ndev); phylink_destroy(priv->phylink); + mdio_device_free(priv->pcs_mdiodev); + free_netdev(ndev); return 0; diff --git a/include/linux/mdio/mdio-regmap.h b/include/linux/mdio/mdio-regmap.h index b8508f152552..679d9069846b 100644 --- a/include/linux/mdio/mdio-regmap.h +++ b/include/linux/mdio/mdio-regmap.h @@ -7,6 +7,8 @@ #ifndef MDIO_REGMAP_H #define MDIO_REGMAP_H +#include <linux/phy.h> + struct device; struct regmap; -- 2.40.1
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