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Message-ID: <87mtwgxik1.fsf@tarshish>
Date: Sun, 07 Feb 2021 12:45:34 +0200
From: Baruch Siach <baruch@...s.co.il>
To: stefanc@...vell.com
Cc: netdev@...r.kernel.org, andrew@...n.ch, ymarkman@...vell.com,
devicetree@...r.kernel.org, atenart@...nel.org,
linux-kernel@...r.kernel.org, linux@...linux.org.uk,
nadavh@...vell.com, rmk+kernel@...linux.org.uk, robh+dt@...nel.org,
thomas.petazzoni@...tlin.com, kuba@...nel.org, mw@...ihalf.com,
davem@...emloft.net, gregory.clement@...tlin.com,
sebastian.hesselbarth@...il.com,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [RESEND PATCH v8 net-next 03/15] net: mvpp2: add CM3 SRAM
memory map
Hi Stefan,
On Sun, Feb 07 2021, stefanc@...vell.com wrote:
> From: Stefan Chulski <stefanc@...vell.com>
>
> This patch adds CM3 memory map and CM3 read/write callbacks.
> No functionality changes.
>
> Signed-off-by: Stefan Chulski <stefanc@...vell.com>
> ---
> 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 <linux/of_net.h>
> #include <linux/of_address.h>
> #include <linux/of_device.h>
> +#include <linux/genalloc.h>
> #include <linux/phy.h>
> #include <linux/phylink.h>
> #include <linux/phy/phy.h>
> @@ -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@...s.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -
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