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Date:   Thu, 5 Jan 2017 17:49:33 +0000
From:   Joao Pinto <Joao.Pinto@...opsys.com>
To:     Alexandre Torgue <alexandre.torgue@...com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "lars.persson@...s.com" <lars.persson@...s.com>,
        "niklass@...s.com" <niklass@...s.com>,
        "swarren@...dia.com" <swarren@...dia.com>,
        "treding@...dia.com" <treding@...dia.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] stmmac: adding new glue driver dwmac-dwc-qos-eth

Hi Alex,

Às 5:19 PM de 1/5/2017, Alexandre Torgue escreveu:
> Hi Joao,
> 
> On 01/04/2017 05:22 PM, Joao Pinto wrote:
>> This patch adds a new glue driver called dwmac-dwc-qos-eth which
>> was based in the dwc_eth_qos as is. To assure retro-compatibility a slight
>> tweak was also added to stmmac_platform.
> 
> Sorry to come late in the review. I have a basic question. Why do you create a
> glue driver for that ?
> dwmac-glues are currently vendor specific, so why create one for IP ? Why not
> continue to use stmmac_platform.c ?
> (It is very basic, I assume I miss something)
> 

If you check in the kernel tree there is a synopsys qos driver under
net/ethernet/synopsys/*.qos.c. At this moment Synopsys has the goal to support
QoS in the mainline kernel and so a discussion took place a month ago, about
what would be the best solution. At the time we (mailing-list folks) decided to
port the net/ethernet/synopsys/*.qos.c driver to stmmac and remove it. This way
we can have stmmac has a single synopsys ethernet software package.
For us to achieve this we agreed that stmmac would have

Lars the current synopsys/*.qos.c maintainer requested that stmmac be compatible
with the devicetree bindings that axis' customers were using in the driver. So
if you check the new glue driver, you will see it parses the legacy drivers DT
bindings and initiates stmmac. So you can see it like a legacy compatible glue
for the stmmac.

Thanks,
Joao

> thanks
> Alex
> 
> 
> 
>>
>> Signed-off-by: Joao Pinto <jpinto@...opsys.com>
>> ---
>> changes v2 -> v3:
>> - Nothing changed, just to keep up patch set version
>> changes v1 -> v2:
>> - WOL was not declared in the new glue driver
>> - clocks were switched and now fixed (apb_pclk and phy_ref_clk)
>>
>>  .../bindings/net/snps,dwc-qos-ethernet.txt         |   3 +
>>  drivers/net/ethernet/stmicro/stmmac/Kconfig        |   9 +
>>  drivers/net/ethernet/stmicro/stmmac/Makefile       |   1 +
>>  .../ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c    | 200 +++++++++++++++++++++
>>  .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |  15 +-
>>  5 files changed, 225 insertions(+), 3 deletions(-)
>>  create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
>>
>> diff --git a/Documentation/devicetree/bindings/net/snps,dwc-qos-ethernet.txt
>> b/Documentation/devicetree/bindings/net/snps,dwc-qos-ethernet.txt
>> index d93f71c..21d27aa 100644
>> --- a/Documentation/devicetree/bindings/net/snps,dwc-qos-ethernet.txt
>> +++ b/Documentation/devicetree/bindings/net/snps,dwc-qos-ethernet.txt
>> @@ -1,5 +1,8 @@
>>  * Synopsys DWC Ethernet QoS IP version 4.10 driver (GMAC)
>>
>> +This binding is deprecated, but it continues to be supported, but new
>> +features should be preferably added to the stmmac binding document.
>> +
>>  This binding supports the Synopsys Designware Ethernet QoS (Quality Of Service)
>>  IP block. The IP supports multiple options for bus type, clocking and reset
>>  structure, and feature list. Consequently, a number of properties and list
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig
>> b/drivers/net/ethernet/stmicro/stmmac/Kconfig
>> index ab66248..99594e3 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
>> +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
>> @@ -29,6 +29,15 @@ config STMMAC_PLATFORM
>>
>>  if STMMAC_PLATFORM
>>
>> +config DWMAC_DWC_QOS_ETH
>> +    tristate "Support for snps,dwc-qos-ethernet.txt DT binding."
>> +    select PHYLIB
>> +    select CRC32
>> +    select MII
>> +    depends on OF && HAS_DMA
>> +    help
>> +      Support for chips using the snps,dwc-qos-ethernet.txt DT binding.
>> +
>>  config DWMAC_GENERIC
>>      tristate "Generic driver for DWMAC"
>>      default STMMAC_PLATFORM
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile
>> b/drivers/net/ethernet/stmicro/stmmac/Makefile
>> index 8f83a86..700c603 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/Makefile
>> +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
>> @@ -16,6 +16,7 @@ obj-$(CONFIG_DWMAC_SOCFPGA)    += dwmac-altr-socfpga.o
>>  obj-$(CONFIG_DWMAC_STI)        += dwmac-sti.o
>>  obj-$(CONFIG_DWMAC_STM32)    += dwmac-stm32.o
>>  obj-$(CONFIG_DWMAC_SUNXI)    += dwmac-sunxi.o
>> +obj-$(CONFIG_DWMAC_DWC_QOS_ETH)    += dwmac-dwc-qos-eth.o
>>  obj-$(CONFIG_DWMAC_GENERIC)    += dwmac-generic.o
>>  stmmac-platform-objs:= stmmac_platform.o
>>  dwmac-altr-socfpga-objs := altr_tse_pcs.o dwmac-socfpga.o
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
>> b/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
>> new file mode 100644
>> index 0000000..4532a7c
>> --- /dev/null
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
>> @@ -0,0 +1,200 @@
>> +/*
>> + * Synopsys DWC Ethernet Quality-of-Service v4.10a linux driver
>> + *
>> + * Copyright (C) 2016 Joao Pinto <jpinto@...opsys.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program. If not, see
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.gnu.org_licenses_&d=DgIC-g&c=DPL6_X_6JkXFx7AXWqB0tg&r=s2fO0hii0OGNOv9qQy_HRXy-xAJUD1NNoEcc3io_kx0&m=WxdcavXD85uZcK9qUC9QsAnK7mu8d7BeoV_d5swO3GI&s=AibQEfk8wEmP3dWHGtq3DBJ2zsceESdTEooLDJV68Zo&e=
>> >.
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/device.h>
>> +#include <linux/ethtool.h>
>> +#include <linux/io.h>
>> +#include <linux/ioport.h>
>> +#include <linux/module.h>
>> +#include <linux/of_net.h>
>> +#include <linux/mfd/syscon.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/stmmac.h>
>> +
>> +#include "stmmac_platform.h"
>> +
>> +static int dwc_eth_dwmac_config_dt(struct platform_device *pdev,
>> +                   struct plat_stmmacenet_data *plat_dat)
>> +{
>> +    struct device_node *np = pdev->dev.of_node;
>> +    u32 burst_map = 0;
>> +    u32 bit_index = 0;
>> +    u32 a_index = 0;
>> +
>> +    if (!plat_dat->axi) {
>> +        plat_dat->axi = kzalloc(sizeof(struct stmmac_axi), GFP_KERNEL);
>> +
>> +        if (!plat_dat->axi)
>> +            return -ENOMEM;
>> +    }
>> +
>> +    plat_dat->axi->axi_lpi_en = of_property_read_bool(np, "snps,en-lpi");
>> +    if (of_property_read_u32(np, "snps,write-requests",
>> +                 &plat_dat->axi->axi_wr_osr_lmt)) {
>> +        /**
>> +         * Since the register has a reset value of 1, if property
>> +         * is missing, default to 1.
>> +         */
>> +        plat_dat->axi->axi_wr_osr_lmt = 1;
>> +    } else {
>> +        /**
>> +         * If property exists, to keep the behavior from dwc_eth_qos,
>> +         * subtract one after parsing.
>> +         */
>> +        plat_dat->axi->axi_wr_osr_lmt--;
>> +    }
>> +
>> +    if (of_property_read_u32(np, "read,read-requests",
>> +                 &plat_dat->axi->axi_rd_osr_lmt)) {
>> +        /**
>> +         * Since the register has a reset value of 1, if property
>> +         * is missing, default to 1.
>> +         */
>> +        plat_dat->axi->axi_rd_osr_lmt = 1;
>> +    } else {
>> +        /**
>> +         * If property exists, to keep the behavior from dwc_eth_qos,
>> +         * subtract one after parsing.
>> +         */
>> +        plat_dat->axi->axi_rd_osr_lmt--;
>> +    }
>> +    of_property_read_u32(np, "snps,burst-map", &burst_map);
>> +
>> +    /* converts burst-map bitmask to burst array */
>> +    for (bit_index = 0; bit_index < 7; bit_index++) {
>> +        if (burst_map & (1 << bit_index)) {
>> +            switch (bit_index) {
>> +            case 0:
>> +            plat_dat->axi->axi_blen[a_index] = 4; break;
>> +            case 1:
>> +            plat_dat->axi->axi_blen[a_index] = 8; break;
>> +            case 2:
>> +            plat_dat->axi->axi_blen[a_index] = 16; break;
>> +            case 3:
>> +            plat_dat->axi->axi_blen[a_index] = 32; break;
>> +            case 4:
>> +            plat_dat->axi->axi_blen[a_index] = 64; break;
>> +            case 5:
>> +            plat_dat->axi->axi_blen[a_index] = 128; break;
>> +            case 6:
>> +            plat_dat->axi->axi_blen[a_index] = 256; break;
>> +            default:
>> +            break;
>> +            }
>> +            a_index++;
>> +        }
>> +    }
>> +
>> +    /* dwc-qos needs GMAC4, AAL, TSO and PMT */
>> +    plat_dat->has_gmac4 = 1;
>> +    plat_dat->dma_cfg->aal = 1;
>> +    plat_dat->tso_en = 1;
>> +    plat_dat->pmt = 1;
>> +
>> +    return 0;
>> +}
>> +
>> +static int dwc_eth_dwmac_probe(struct platform_device *pdev)
>> +{
>> +    struct plat_stmmacenet_data *plat_dat;
>> +    struct stmmac_resources stmmac_res;
>> +    struct resource *res;
>> +    int ret;
>> +
>> +    /**
>> +     * Since stmmac_platform supports name IRQ only, basic platform
>> +     * resource initialization is done in the glue logic.
>> +     */
>> +    stmmac_res.irq = platform_get_irq(pdev, 0);
>> +    if (stmmac_res.irq < 0) {
>> +        if (stmmac_res.irq != -EPROBE_DEFER) {
>> +            dev_err(&pdev->dev,
>> +                "IRQ configuration information not found\n");
>> +        }
>> +        return stmmac_res.irq;
>> +    }
>> +    stmmac_res.wol_irq = stmmac_res.irq;
>> +
>> +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +    stmmac_res.addr = devm_ioremap_resource(&pdev->dev, res);
>> +    if (IS_ERR(stmmac_res.addr))
>> +        return PTR_ERR(stmmac_res.addr);
>> +
>> +    plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
>> +    if (IS_ERR(plat_dat))
>> +        return PTR_ERR(plat_dat);
>> +
>> +    plat_dat->stmmac_clk = devm_clk_get(&pdev->dev, "apb_pclk");
>> +    if (IS_ERR(plat_dat->stmmac_clk)) {
>> +        dev_err(&pdev->dev, "apb_pclk clock not found.\n");
>> +        ret = PTR_ERR(plat_dat->stmmac_clk);
>> +        plat_dat->stmmac_clk = NULL;
>> +        goto err_remove_config_dt;
>> +    }
>> +    clk_prepare_enable(plat_dat->stmmac_clk);
>> +
>> +    plat_dat->pclk = devm_clk_get(&pdev->dev, "phy_ref_clk");
>> +    if (IS_ERR(plat_dat->pclk)) {
>> +        dev_err(&pdev->dev, "phy_ref_clk clock not found.\n");
>> +        ret = PTR_ERR(plat_dat->pclk);
>> +        plat_dat->pclk = NULL;
>> +        goto err_out_clk_dis_phy;
>> +    }
>> +    clk_prepare_enable(plat_dat->pclk);
>> +
>> +    ret = dwc_eth_dwmac_config_dt(pdev, plat_dat);
>> +    if (ret)
>> +        goto err_out_clk_dis_aper;
>> +
>> +    ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
>> +    if (ret)
>> +        goto err_out_clk_dis_aper;
>> +
>> +    return 0;
>> +
>> +err_out_clk_dis_aper:
>> +    clk_disable_unprepare(plat_dat->pclk);
>> +err_out_clk_dis_phy:
>> +    clk_disable_unprepare(plat_dat->stmmac_clk);
>> +err_remove_config_dt:
>> +    stmmac_remove_config_dt(pdev, plat_dat);
>> +
>> +    return ret;
>> +}
>> +
>> +static int dwc_eth_dwmac_remove(struct platform_device *pdev)
>> +{
>> +    return stmmac_pltfr_remove(pdev);
>> +}
>> +
>> +static const struct of_device_id dwc_eth_dwmac_match[] = {
>> +    { .compatible = "snps,dwc-qos-ethernet-4.10", },
>> +    { }
>> +};
>> +MODULE_DEVICE_TABLE(of, dwc_eth_dwmac_match);
>> +
>> +static struct platform_driver dwc_eth_dwmac_driver = {
>> +    .probe  = dwc_eth_dwmac_probe,
>> +    .remove = dwc_eth_dwmac_remove,
>> +    .driver = {
>> +        .name           = "dwc-eth-dwmac",
>> +        .of_match_table = dwc_eth_dwmac_match,
>> +    },
>> +};
>> +module_platform_driver(dwc_eth_dwmac_driver);
>> +
>> +MODULE_AUTHOR("Joao Pinto <jpinto@...opsys.com>");
>> +MODULE_DESCRIPTION("Synopsys DWC Ethernet Quality-of-Service v4.10a driver");
>> +MODULE_LICENSE("GPL v2");
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> index 4e44f9c..00c0f8d 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> @@ -181,10 +181,19 @@ static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
>>          mdio = false;
>>      }
>>
>> -    /* If snps,dwmac-mdio is passed from DT, always register the MDIO */
>> -    for_each_child_of_node(np, plat->mdio_node) {
>> -        if (of_device_is_compatible(plat->mdio_node, "snps,dwmac-mdio"))
>> +    /* exception for dwmac-dwc-qos-eth glue logic */
>> +    if (of_device_is_compatible(np, "snps,dwc-qos-ethernet-4.10")) {
>> +        plat->mdio_node = of_get_child_by_name(np, "mdio");
>> +    } else {
>> +        /**
>> +         * If snps,dwmac-mdio is passed from DT, always register
>> +         * the MDIO
>> +         */
>> +        for_each_child_of_node(np, plat->mdio_node) {
>> +            if (of_device_is_compatible(plat->mdio_node,
>> +                            "snps,dwmac-mdio"))
>>              break;
>> +        }
>>      }
>>
>>      if (plat->mdio_node) {
>>

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