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Sun, 07 Feb 2021 10:45:40 +0000 Received: from guitar.tcltek.co.il ([192.115.133.116] helo=mx.tkos.co.il) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l8hZR-0008OA-Tj for linux-arm-kernel@lists.infradead.org; Sun, 07 Feb 2021 10:45:39 +0000 Received: from tarshish (unknown [10.0.8.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx.tkos.co.il (Postfix) with ESMTPS id 790FD440820; Sun, 7 Feb 2021 12:45:34 +0200 (IST) References: <1612685964-21890-1-git-send-email-stefanc@marvell.com> <1612685964-21890-4-git-send-email-stefanc@marvell.com> User-agent: mu4e 1.4.15; emacs 27.1 From: Baruch Siach To: stefanc@marvell.com Subject: Re: [RESEND PATCH v8 net-next 03/15] net: mvpp2: add CM3 SRAM memory map In-reply-to: <1612685964-21890-4-git-send-email-stefanc@marvell.com> Date: Sun, 07 Feb 2021 12:45:34 +0200 Message-ID: <87mtwgxik1.fsf@tarshish> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210207_054538_372035_19797C5F X-CRM114-Status: GOOD ( 30.21 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, ymarkman@marvell.com, andrew@lunn.ch, netdev@vger.kernel.org, atenart@kernel.org, linux-kernel@vger.kernel.org, linux@armlinux.org.uk, nadavh@marvell.com, rmk+kernel@armlinux.org.uk, robh+dt@kernel.org, linux-arm-kernel@lists.infradead.org, thomas.petazzoni@bootlin.com, kuba@kernel.org, mw@semihalf.com, davem@davemloft.net, gregory.clement@bootlin.com, sebastian.hesselbarth@gmail.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Stefan, On Sun, Feb 07 2021, stefanc@marvell.com wrote: > From: Stefan Chulski > > This patch adds CM3 memory map and CM3 read/write callbacks. > No functionality changes. > > Signed-off-by: Stefan Chulski > --- > drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 7 +++ > drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 63 +++++++++++++++++++- > 2 files changed, 67 insertions(+), 3 deletions(-) > > diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h > index 6bd7e40..aec9179 100644 > --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h > +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h > @@ -748,6 +748,9 @@ > #define MVPP2_TX_FIFO_THRESHOLD(kb) \ > ((kb) * 1024 - MVPP2_TX_FIFO_THRESHOLD_MIN) > > +/* MSS Flow control */ > +#define MSS_SRAM_SIZE 0x800 > + > /* RX buffer constants */ > #define MVPP2_SKB_SHINFO_SIZE \ > SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) > @@ -925,6 +928,7 @@ struct mvpp2 { > /* Shared registers' base addresses */ > void __iomem *lms_base; > void __iomem *iface_base; > + void __iomem *cm3_base; > > /* On PPv2.2, each "software thread" can access the base > * register through a separate address space, each 64 KB apart > @@ -996,6 +1000,9 @@ struct mvpp2 { > > /* page_pool allocator */ > struct page_pool *page_pool[MVPP2_PORT_MAX_RXQ]; > + > + /* CM3 SRAM pool */ > + struct gen_pool *sram_pool; > }; > > struct mvpp2_pcpu_stats { > diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c > index a07cf60..307f9fd 100644 > --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c > +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c > @@ -25,6 +25,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -6846,6 +6847,44 @@ static int mvpp2_init(struct platform_device *pdev, struct mvpp2 *priv) > return 0; > } > > +static int mvpp2_get_sram(struct platform_device *pdev, > + struct mvpp2 *priv) > +{ > + struct device_node *dn = pdev->dev.of_node; > + static bool defer_once; > + struct resource *res; > + > + if (has_acpi_companion(&pdev->dev)) { > + res = platform_get_resource(pdev, IORESOURCE_MEM, 2); > + if (!res) { > + dev_warn(&pdev->dev, "ACPI is too old, Flow control not supported\n"); > + return 0; > + } > + priv->cm3_base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(priv->cm3_base)) > + return PTR_ERR(priv->cm3_base); > + } else { > + priv->sram_pool = of_gen_pool_get(dn, "cm3-mem", 0); > + if (!priv->sram_pool) { > + if (!defer_once) { > + defer_once = true; > + /* Try defer once */ > + return -EPROBE_DEFER; > + } > + dev_warn(&pdev->dev, "DT is too old, Flow control not supported\n"); This warning will show on every DT system with no cm3-mem property, right? > + return -ENOMEM; > + } > + /* cm3_base allocated with offset zero into the SRAM since mapping size > + * is equal to requested size. > + */ > + priv->cm3_base = (void __iomem *)gen_pool_alloc(priv->sram_pool, > + MSS_SRAM_SIZE); > + if (!priv->cm3_base) > + return -ENOMEM; > + } > + return 0; > +} > + > static int mvpp2_probe(struct platform_device *pdev) > { > const struct acpi_device_id *acpi_id; > @@ -6902,6 +6941,13 @@ static int mvpp2_probe(struct platform_device *pdev) > priv->iface_base = devm_ioremap_resource(&pdev->dev, res); > if (IS_ERR(priv->iface_base)) > return PTR_ERR(priv->iface_base); > + > + /* Map CM3 SRAM */ > + err = mvpp2_get_sram(pdev, priv); > + if (err == -EPROBE_DEFER) > + return err; > + else if (err) > + dev_warn(&pdev->dev, "Fail to alloc CM3 SRAM\n"); This one will show as well. I would not expect that from a patch that makes "no functional change". baruch > } > > if (priv->hw_version == MVPP22 && dev_of_node(&pdev->dev)) { > @@ -6947,11 +6993,13 @@ static int mvpp2_probe(struct platform_device *pdev) > > if (dev_of_node(&pdev->dev)) { > priv->pp_clk = devm_clk_get(&pdev->dev, "pp_clk"); > - if (IS_ERR(priv->pp_clk)) > - return PTR_ERR(priv->pp_clk); > + if (IS_ERR(priv->pp_clk)) { > + err = PTR_ERR(priv->pp_clk); > + goto err_cm3; > + } > err = clk_prepare_enable(priv->pp_clk); > if (err < 0) > - return err; > + goto err_cm3; > > priv->gop_clk = devm_clk_get(&pdev->dev, "gop_clk"); > if (IS_ERR(priv->gop_clk)) { > @@ -7087,6 +7135,11 @@ static int mvpp2_probe(struct platform_device *pdev) > clk_disable_unprepare(priv->gop_clk); > err_pp_clk: > clk_disable_unprepare(priv->pp_clk); > +err_cm3: > + if (priv->sram_pool && priv->cm3_base) > + gen_pool_free(priv->sram_pool, (unsigned long)priv->cm3_base, > + MSS_SRAM_SIZE); > + > return err; > } > > @@ -7127,6 +7180,10 @@ static int mvpp2_remove(struct platform_device *pdev) > aggr_txq->descs_dma); > } > > + if (priv->sram_pool && priv->cm3_base) > + gen_pool_free(priv->sram_pool, (unsigned long)priv->cm3_base, > + MSS_SRAM_SIZE); > + > if (is_acpi_node(port_fwnode)) > return 0; -- ~. .~ Tk Open Systems =}------------------------------------------------ooO--U--Ooo------------{= - baruch@tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il - _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel