diff mbox series

[net-next,v3,4/5] net: stmmac: add support for RZ/N1 GMAC

Message ID 20240415-rzn1-gmac1-v3-4-ab12f2c4401d@bootlin.com (mailing list archive)
State New, archived
Headers show
Series net: stmmac: Add support for RZN1 GMAC devices | expand

Commit Message

Romain Gantois April 15, 2024, 9:18 a.m. UTC
From: Clément Léger <clement.leger@bootlin.com>

Add support for the Renesas RZ/N1 GMAC. This support can make use of a
custom RZ/N1 PCS which is fetched by parsing the pcs-handle device tree
property.

Signed-off-by: "Clément Léger" <clement.leger@bootlin.com>
Co-developed-by: Romain Gantois <romain.gantois@bootlin.com>
Signed-off-by: Romain Gantois <romain.gantois@bootlin.com>
---
 MAINTAINERS                                      |  6 ++
 drivers/net/ethernet/stmicro/stmmac/Kconfig      | 12 ++++
 drivers/net/ethernet/stmicro/stmmac/Makefile     |  1 +
 drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c | 88 ++++++++++++++++++++++++
 4 files changed, 107 insertions(+)

Comments

Serge Semin April 16, 2024, 2:47 p.m. UTC | #1
On Mon, Apr 15, 2024 at 11:18:44AM +0200, Romain Gantois wrote:
> [...]
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c
> new file mode 100644
> index 0000000000000..e85524c2017cf
> --- /dev/null
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c
> @@ -0,0 +1,88 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2024 Schneider-Electric
> + *
> + * Clément Léger <clement.leger@bootlin.com>
> + */
> +
> +#include <linux/of.h>
> +#include <linux/pcs-rzn1-miic.h>
> +#include <linux/phylink.h>
> +#include <linux/platform_device.h>
> +
> +#include "stmmac_platform.h"
> +#include "stmmac.h"
> +
> +static int rzn1_dwmac_pcs_init(struct stmmac_priv *priv,

> +			       struct mac_device_info *hw)

AFAICS hw is unused, and the mac_device_info instance is reached via
the priv pointer. What about dropping the unused argument then?

> +{
> +	struct device_node *np = priv->device->of_node;
> +	struct device_node *pcs_node;
> +	struct phylink_pcs *pcs;
> +
> +	pcs_node = of_parse_phandle(np, "pcs-handle", 0);
> +
> +	if (pcs_node) {
> +		pcs = miic_create(priv->device, pcs_node);
> +		of_node_put(pcs_node);
> +		if (IS_ERR(pcs))
> +			return PTR_ERR(pcs);
> +
> +		priv->hw->phylink_pcs = pcs;
> +	}
> +
> +	return 0;
> +}
> +
> +static void rzn1_dwmac_pcs_exit(struct stmmac_priv *priv,

> +				struct mac_device_info *hw)

ditto.

-Serge(y)

> +{
> +	if (priv->hw->phylink_pcs)
> +		miic_destroy(priv->hw->phylink_pcs);
> +}
> +
> [...]
Romain Gantois April 18, 2024, 11:57 a.m. UTC | #2
Hi Serge,

On Tue, 16 Apr 2024, Serge Semin wrote:

> > +static int rzn1_dwmac_pcs_init(struct stmmac_priv *priv,
> 
> > +			       struct mac_device_info *hw)
> 
> AFAICS hw is unused, and the mac_device_info instance is reached via
> the priv pointer. What about dropping the unused argument then?

Unfortunately, this is an implementation of the pcs_init() callback, which is 
also used by socfpga (see patch 4/6 in this series). The socfpga implementations 
use the hw parameter for both pcs_init() and pcs_exit() so I can't remove it.

Thanks,
Serge Semin April 18, 2024, 12:57 p.m. UTC | #3
On Thu, Apr 18, 2024 at 01:57:47PM +0200, Romain Gantois wrote:
> Hi Serge,
> 
> On Tue, 16 Apr 2024, Serge Semin wrote:
> 
> > > +static int rzn1_dwmac_pcs_init(struct stmmac_priv *priv,
> > 
> > > +			       struct mac_device_info *hw)
> > 
> > AFAICS hw is unused, and the mac_device_info instance is reached via
> > the priv pointer. What about dropping the unused argument then?
> 

> Unfortunately, this is an implementation of the pcs_init() callback, which is 
> also used by socfpga (see patch 4/6 in this series). The socfpga implementations 
> use the hw parameter for both pcs_init() and pcs_exit() so I can't remove it.

I had that patch content in mind when was writing my comment. There is
no point in passing the hw-pointer there either because you already
have the stmmac_priv pointer. There is stmmac_priv::hw field which you
can use instead in the same way as you do in this patch. Here is the
respective change for your SoCFPGA patch:

+static int socfpga_dwmac_pcs_init(struct stmmac_priv *priv,
+				  struct mac_device_info *hw)
+{
...
+
+	priv->hw->phylink_pcs = pcs;
+	return 0;
+}
+
+static void socfpga_dwmac_pcs_exit(struct stmmac_priv *priv,
+				   struct mac_device_info *hw)
+{
+	if (priv->hw->phylink_pcs)
+		lynx_pcs_destroy(priv->hw->phylink_pcs);
+}

-Serge(y)

> 
> Thanks,
> 
> -- 
> Romain Gantois, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
Romain Gantois April 18, 2024, 1:53 p.m. UTC | #4
On Thu, 18 Apr 2024, Serge Semin wrote:

> On Thu, Apr 18, 2024 at 01:57:47PM +0200, Romain Gantois wrote:
> > Hi Serge,
> > 
> > On Tue, 16 Apr 2024, Serge Semin wrote:
> > 
> > > > +static int rzn1_dwmac_pcs_init(struct stmmac_priv *priv,
> > > 
> > > > +			       struct mac_device_info *hw)
> > > 
> > > AFAICS hw is unused, and the mac_device_info instance is reached via
> > > the priv pointer. What about dropping the unused argument then?
> > 
> 
> > Unfortunately, this is an implementation of the pcs_init() callback, which is 
> > also used by socfpga (see patch 4/6 in this series). The socfpga implementations 
> > use the hw parameter for both pcs_init() and pcs_exit() so I can't remove it.
> 
> I had that patch content in mind when was writing my comment. There is
> no point in passing the hw-pointer there either because you already
> have the stmmac_priv pointer. There is stmmac_priv::hw field which you
> can use instead in the same way as you do in this patch. Here is the
> respective change for your SoCFPGA patch:
> 

You're right, I'll remove the parameter.

Thanks,
diff mbox series

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index 5ba3fe6ac09ce..20f92241e0058 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18845,6 +18845,12 @@  F:	include/dt-bindings/net/pcs-rzn1-miic.h
 F:	include/linux/pcs-rzn1-miic.h
 F:	net/dsa/tag_rzn1_a5psw.c
 
+RENESAS RZ/N1 DWMAC GLUE LAYER
+M:	Romain Gantois <romain.gantois@bootlin.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/net/renesas,rzn1-gmac.yaml
+F:	drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c
+
 RENESAS RZ/N1 RTC CONTROLLER DRIVER
 M:	Miquel Raynal <miquel.raynal@bootlin.com>
 L:	linux-rtc@vger.kernel.org
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 4ec61f1ee71a2..05cc07b8f48c0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -142,6 +142,18 @@  config DWMAC_ROCKCHIP
 	  This selects the Rockchip RK3288 SoC glue layer support for
 	  the stmmac device driver.
 
+config DWMAC_RZN1
+	tristate "Renesas RZ/N1 dwmac support"
+	default ARCH_RZN1
+	depends on OF && (ARCH_RZN1 || COMPILE_TEST)
+	select PCS_RZN1_MIIC
+	help
+	  Support for Ethernet controller on Renesas RZ/N1 SoC family.
+
+	  This selects the Renesas RZ/N1 SoC glue layer support for
+	  the stmmac device driver. This support can make use of a custom MII
+	  converter PCS device.
+
 config DWMAC_SOCFPGA
 	tristate "SOCFPGA dwmac support"
 	default ARCH_INTEL_SOCFPGA
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 26cad4344701e..c2f0e91f6bf83 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -21,6 +21,7 @@  obj-$(CONFIG_DWMAC_MEDIATEK)	+= dwmac-mediatek.o
 obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o dwmac-meson8b.o
 obj-$(CONFIG_DWMAC_QCOM_ETHQOS)	+= dwmac-qcom-ethqos.o
 obj-$(CONFIG_DWMAC_ROCKCHIP)	+= dwmac-rk.o
+obj-$(CONFIG_DWMAC_RZN1)	+= dwmac-rzn1.o
 obj-$(CONFIG_DWMAC_SOCFPGA)	+= dwmac-altr-socfpga.o
 obj-$(CONFIG_DWMAC_STARFIVE)	+= dwmac-starfive.o
 obj-$(CONFIG_DWMAC_STI)		+= dwmac-sti.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c
new file mode 100644
index 0000000000000..e85524c2017cf
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c
@@ -0,0 +1,88 @@ 
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 Schneider-Electric
+ *
+ * Clément Léger <clement.leger@bootlin.com>
+ */
+
+#include <linux/of.h>
+#include <linux/pcs-rzn1-miic.h>
+#include <linux/phylink.h>
+#include <linux/platform_device.h>
+
+#include "stmmac_platform.h"
+#include "stmmac.h"
+
+static int rzn1_dwmac_pcs_init(struct stmmac_priv *priv,
+			       struct mac_device_info *hw)
+{
+	struct device_node *np = priv->device->of_node;
+	struct device_node *pcs_node;
+	struct phylink_pcs *pcs;
+
+	pcs_node = of_parse_phandle(np, "pcs-handle", 0);
+
+	if (pcs_node) {
+		pcs = miic_create(priv->device, pcs_node);
+		of_node_put(pcs_node);
+		if (IS_ERR(pcs))
+			return PTR_ERR(pcs);
+
+		priv->hw->phylink_pcs = pcs;
+	}
+
+	return 0;
+}
+
+static void rzn1_dwmac_pcs_exit(struct stmmac_priv *priv,
+				struct mac_device_info *hw)
+{
+	if (priv->hw->phylink_pcs)
+		miic_destroy(priv->hw->phylink_pcs);
+}
+
+static int rzn1_dwmac_probe(struct platform_device *pdev)
+{
+	struct plat_stmmacenet_data *plat_dat;
+	struct stmmac_resources stmmac_res;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+	if (ret)
+		return ret;
+
+	plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
+	if (IS_ERR(plat_dat))
+		return PTR_ERR(plat_dat);
+
+	plat_dat->bsp_priv = plat_dat;
+	plat_dat->pcs_init = rzn1_dwmac_pcs_init;
+	plat_dat->pcs_exit = rzn1_dwmac_pcs_exit;
+
+	ret = stmmac_dvr_probe(dev, plat_dat, &stmmac_res);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static const struct of_device_id rzn1_dwmac_match[] = {
+	{ .compatible = "renesas,rzn1-gmac" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, rzn1_dwmac_match);
+
+static struct platform_driver rzn1_dwmac_driver = {
+	.probe  = rzn1_dwmac_probe,
+	.remove_new = stmmac_pltfr_remove,
+	.driver = {
+		.name           = "rzn1-dwmac",
+		.of_match_table = rzn1_dwmac_match,
+	},
+};
+module_platform_driver(rzn1_dwmac_driver);
+
+MODULE_AUTHOR("Clément Léger <clement.leger@bootlin.com>");
+MODULE_DESCRIPTION("Renesas RZN1 DWMAC specific glue layer");
+MODULE_LICENSE("GPL");