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Message-ID: <CAGhQ9VypZ5J0pQmrf1Mk-mNsv=XTXu7fhoLt_r2LHJ_Lsyj0yA@mail.gmail.com>
Date: Sat, 13 Feb 2016 14:48:56 +0100
From: Joachim Eastwood <manabian@...il.com>
To: Alexandre TORGUE <alexandre.torgue@...il.com>
Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>,
Giuseppe Cavallaro <peppe.cavallaro@...com>,
netdev <netdev@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] net: ethernet: dwmac: add Ethernet glue logic for
stm32 chip
On 3 February 2016 at 15:54, Alexandre TORGUE
<alexandre.torgue@...il.com> wrote:
> stm324xx family chips support Synopsys MAC 3.510 IP.
> This patch adds settings for logical glue logic:
> -clocks
> -mode selection MII or RMII.
>
> Signed-off-by: Alexandre TORGUE <alexandre.torgue@...il.com>
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> index cec147d..a94dd15 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
> +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> @@ -114,6 +114,18 @@ config DWMAC_SUNXI
> This selects Allwinner SoC glue layer support for the
> stmmac device driver. This driver is used for A20/A31
> GMAC ethernet controller.
> +
> +config DWMAC_STM32
> + tristate "STM32 DWMAC support"
> + default ARCH_STM32
> + depends on OF
> + select MFD_SYSCON
> + ---help---
> + Support for ethernet controller on STM32 SOCs.
> +
> + This selects STM32 SoC glue layer support for the stmmac
> + device driver. This driver is used on for the STM32 series
> + SOCs GMAC ethernet controller.
> endif
>
> config STMMAC_PCI
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
> index b390161..9fb2061 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Makefile
> +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_DWMAC_SOCFPGA) += dwmac-socfpga.o
> obj-$(CONFIG_DWMAC_STI) += dwmac-sti.o
> obj-$(CONFIG_DWMAC_SUNXI) += dwmac-sunxi.o
> obj-$(CONFIG_DWMAC_GENERIC) += dwmac-generic.o
> +obj-$(CONFIG_DWMAC_STM32) += dwmac-stm32.o
Keep these sorted. There also a comment in the Makefile that states
that the generic should always be last.
> stmmac-platform-objs:= stmmac_platform.o
>
> obj-$(CONFIG_STMMAC_PCI) += stmmac-pci.o
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
> new file mode 100644
> index 0000000..56ccc20
> --- /dev/null
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
> @@ -0,0 +1,177 @@
> +/*
> + * dwmac-stm32.c - DWMAC Specific Glue layer for STM32 MCU
> + *
> + * Copyright (C) Alexandre Torgue 2015
> + * Author: Alexandre Torgue <alexandre.torgue@...il.com>
> + * License terms: GNU General Public License (GPL), version 2
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/platform_device.h>
> +#include <linux/stmmac.h>
> +#include <linux/phy.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/clk.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_net.h>
Consider sorting the includes.
> +
> +#include "stmmac_platform.h"
> +
> +#define MII_PHY_SEL_MASK BIT(23)
> +
> +struct stm32_dwmac {
> + int interface; /* MII interface */
> + struct clk *clk_tx;
> + struct clk *clk_rx;
> + u32 mode_reg; /* MAC glue-logic mode register */
> + struct device *dev;
dev doesn't seem to be used anywhere.
> + struct regmap *regmap;
> + u32 speed;
> +};
> +
> +static int stm32_dwmac_init(struct platform_device *pdev, void *priv)
> +{
> + struct stm32_dwmac *dwmac = priv;
> + struct regmap *regmap = dwmac->regmap;
> + int ret, iface = dwmac->interface;
> + u32 reg = dwmac->mode_reg;
> + u32 val;
> +
> + if (dwmac->clk_tx)
> + ret = clk_prepare_enable(dwmac->clk_tx);
The clk API handles a NULL clk so you don't really need to check for it.
> + if (ret)
> + goto out;
> +
> + if (dwmac->clk_rx)
> + ret = clk_prepare_enable(dwmac->clk_rx);
Same here.
> + if (ret)
> + goto out_disable_clk_tx;
> +
> + val = (iface == PHY_INTERFACE_MODE_MII) ? 0 : 1;
> + ret = regmap_update_bits(regmap, reg, MII_PHY_SEL_MASK, val);
> + if (ret)
> + goto out_disable_clk_tx_rx;
> +
> + return 0;
> +
> +out_disable_clk_tx_rx:
> + clk_disable_unprepare(dwmac->clk_rx);
> +out_disable_clk_tx:
> + clk_disable_unprepare(dwmac->clk_tx);
> +out:
> + return ret;
> +}
> +
> +static void stm32_dwmac_exit(struct platform_device *pdev, void *priv)
> +{
> + struct stm32_dwmac *dwmac = priv;
> +
> + if (dwmac->clk_tx)
> + clk_disable_unprepare(dwmac->clk_tx);
> + if (dwmac->clk_rx)
> + clk_disable_unprepare(dwmac->clk_rx);
Same here.
> +}
> +
> +static int stm32_dwmac_parse_data(struct stm32_dwmac *dwmac,
> + struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + struct regmap *regmap;
> + int err;
> +
> + if (!np)
> + return -EINVAL;
Can this ever happen?
This is a DT only driver, right?
> +
> + /* Get TX/RX clocks */
> + dwmac->clk_tx = devm_clk_get(dev, "tx-clk");
> + if (IS_ERR(dwmac->clk_tx)) {
> + dev_warn(dev, "No tx clock provided...\n");
> + dwmac->clk_tx = NULL;
> + }
> + dwmac->clk_rx = devm_clk_get(dev, "rx-clk");
> + if (IS_ERR(dwmac->clk_rx)) {
> + dev_warn(dev, "No rx clock provided...\n");
> + dwmac->clk_rx = NULL;
> + }
> +
> + /* Get mode register */
> + regmap = syscon_regmap_lookup_by_phandle(np, "st,syscon");
> + if (IS_ERR(regmap))
> + return PTR_ERR(regmap);
> +
> + err = of_property_read_u32_index(np, "st,syscon", 1, &dwmac->mode_reg);
> + if (err) {
> + dev_err(dev, "Can't get sysconfig mode offset (%d)\n", err);
> + return err;
> + }
> +
> + dwmac->dev = dev;
> + dwmac->interface = of_get_phy_mode(np);
> + dwmac->regmap = regmap;
> +
> + return 0;
> +}
> +
> +static int stm32_dwmac_probe(struct platform_device *pdev)
> +{
> + struct plat_stmmacenet_data *plat_dat;
> + struct stmmac_resources stmmac_res;
> + struct stm32_dwmac *dwmac;
> + int ret;
> +
> + ret = stmmac_get_platform_resources(pdev, &stmmac_res);
> + if (ret)
> + return ret;
> +
> + plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
> + if (IS_ERR(plat_dat))
> + return PTR_ERR(plat_dat);
> +
> + dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
> + if (!dwmac)
> + return -ENOMEM;
> +
> + ret = stm32_dwmac_parse_data(dwmac, pdev);
> + if (ret) {
> + dev_err(&pdev->dev, "Unable to parse OF data\n");
> + return ret;
> + }
> +
> + plat_dat->bsp_priv = dwmac;
> + plat_dat->init = stm32_dwmac_init;
> + plat_dat->exit = stm32_dwmac_exit;
Instead of using these callbacks could you rather implement the PM
callbacks directly in this driver?
I don't think it should add much code and it will make it look more
like standard driver. This will also give you some more control and
flexibility in your code.
> +
> + ret = stm32_dwmac_init(pdev, plat_dat->bsp_priv);
> + if (ret)
> + return ret;
> +
> + return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
> +}
> +
> +static const struct of_device_id stm32_dwmac_match[] = {
> + { .compatible = "st,stm32-dwmac"},
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, stm32_dwmac_match);
> +
> +static struct platform_driver stm32_dwmac_driver = {
> + .probe = stm32_dwmac_probe,
> + .remove = stmmac_pltfr_remove,
Could you implement the .remove callback in your driver instead of
using stmmac_pltfr_remove?
Same reasons as above.
> + .driver = {
> + .name = "stm32-dwmac",
> + .pm = &stmmac_pltfr_pm_ops,
> + .of_match_table = stm32_dwmac_match,
> + },
> +};
> +module_platform_driver(stm32_dwmac_driver);
> +
> +MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@...il.com>");
> +MODULE_DESCRIPTION("STMicroelectronics MCU DWMAC Specific Glue layer");
> +MODULE_LICENSE("GPL");
Since you state:
> + * License terms: GNU General Public License (GPL), version 2
You might want to switch use: MODULE_LICENSE("GPL v2");
regards,
Joachim Eastwood
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