Date:   Wed, 4 Jan 2017 11:08:52 +0000
From:   Joao Pinto <Joao.Pinto@...opsys.com>
To:     Niklas Cassel <niklas.cassel@...s.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>, <davem@...emloft.net>
CC:     <larper@...s.com>, <swarren@...dia.com>, <treding@...dia.com>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH 3/3] stmmac: adding new glue driver dwmac-dwc-qos-eth

Hi Niklas,

Às 10:59 AM de 1/4/2017, Niklas Cassel escreveu:
> Hello Joao
> 
> I just tested this series using the dwc_eth_qos DT bindings.
> Good work!
> 
> Unfortunately I get the following error:
> 
> <3>[   12.032463] dwc-eth-dwmac f8010000.ethernet eth0: stmmac_open: ERROR: allocating the WoL IRQ -1098801248 (-22)
> 
> 
> This appears to be because of a corner case in stmmac_platform.c
> where wol_irq can differ from the normal irq.
> 
> Adding the following one liner fixes the problem:
> 
> 
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
> @@ -125,6 +125,7 @@ static int dwc_eth_dwmac_probe(struct platform_device *pdev)
>                 }
>                 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);
> 

Ok, I'll add this fix to the patch and give a check to the clks.
I already sent a v1 patch set to net-dev, and I am now going to generate v2 so
it would be great to have your tested.by tag to push it faster :) Thanks!

> 
> 
> 
> I have one comment about clocks interleaved as well
> 
> 
> 
> On 01/04/2017 10:44 AM, 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.
>>
>> Signed-off-by: Joao Pinto <jpinto@...opsys.com>
>> Reviewed-by: Lars Persson <larper@...s.com>
>> ---
>>  .../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    | 199 +++++++++++++++++++++
>>  .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |  15 +-
>>  5 files changed, 224 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..8a6ac06
>> --- /dev/null
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
>> @@ -0,0 +1,199 @@
>> +/*
>> + * 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=DrobFP08nu4hh6e05EgeOl1xD34OacyiZ-be_GG829Q&s=WLSkpBK06KCu-_kvN305yE6YncNYcDG_Bk0pgqSBG1o&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;
>> +	}
>> +
>> +	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, "phy_ref_clk");
>> +	if (IS_ERR(plat_dat->stmmac_clk)) {
>> +		dev_err(&pdev->dev, "apb_pclk clock not found.\n");
> 
> Error message does not match the devm_clk_get.
> 
> Looking at synopsys/dwc_eth_qos.c
> phy_ref_clk is just a dummy, used for verbosity.
> apb_pclk is the clock which is actually used for setting csr etc.
> 
> So it should be
> 
> plat_dat->stmmac_clk = devm_clk_get(&pdev->dev, "apb_pclk");
> 
> 
> So that way the warning is already correct :)
> 
> 
> 
>> +		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, "apb_pclk");
>> +	if (IS_ERR(plat_dat->pclk)) {
>> +		dev_err(&pdev->dev, "phy_ref_clk clock not found.\n");
> 
> Error message does not match the devm_clk_get,
> however, since this should be
> 
> plat_dat->pclk = devm_clk_get(&pdev->dev, "phy_ref_clk");
> 
> the warning is correct :)
> 
>> +		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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