From patchwork Mon Jul 19 14:38:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar X-Patchwork-Id: 12385985 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 55923C6377A for ; Mon, 19 Jul 2021 14:39:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 37B0F61166 for ; Mon, 19 Jul 2021 14:39:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241204AbhGSN7O (ORCPT ); Mon, 19 Jul 2021 09:59:14 -0400 Received: from relmlor2.renesas.com ([210.160.252.172]:36364 "EHLO relmlie6.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S241191AbhGSN7N (ORCPT ); Mon, 19 Jul 2021 09:59:13 -0400 X-IronPort-AV: E=Sophos;i="5.84,252,1620658800"; d="scan'208";a="88086576" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 19 Jul 2021 23:39:52 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 458304003EAE; Mon, 19 Jul 2021 23:39:48 +0900 (JST) From: Lad Prabhakar To: Geert Uytterhoeven , Rob Herring , Fabrizio Castro , Wolfgang Grandegger , Marc Kleine-Budde , "David S. Miller" , Jakub Kicinski , Michael Turquette , Stephen Boyd , Philipp Zabel Cc: linux-can@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Prabhakar , Biju Das , Lad Prabhakar Subject: [PATCH v2 2/5] can: rcar_canfd: Add support for RZ/G2L family Date: Mon, 19 Jul 2021 15:38:08 +0100 Message-Id: <20210719143811.2135-3-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210719143811.2135-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20210719143811.2135-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org CANFD block on RZ/G2L SoC is almost identical to one found on R-Car Gen3 SoC's. On RZ/G2L SoC interrupt sources for each channel are split into different sources and the IP doesn't divide (1/2) CANFD clock within the IP. This patch adds compatible string for RZ/G2L family and registers the irq handlers required for CANFD operation. IRQ numbers are now fetched based on names instead of indices. For backward compatibility on non RZ/G2L SoC's we fallback reading based on indices. Signed-off-by: Lad Prabhakar Reviewed-by: Biju Das --- drivers/net/can/rcar/rcar_canfd.c | 178 ++++++++++++++++++++++++------ 1 file changed, 147 insertions(+), 31 deletions(-) diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c index 311e6ca3bdc4..d4affc002fb3 100644 --- a/drivers/net/can/rcar/rcar_canfd.c +++ b/drivers/net/can/rcar/rcar_canfd.c @@ -37,9 +37,15 @@ #include #include #include +#include #define RCANFD_DRV_NAME "rcar_canfd" +enum rcanfd_chip_id { + RENESAS_RCAR_GEN3 = 0, + RENESAS_RZG2L, +}; + /* Global register bits */ /* RSCFDnCFDGRMCFG */ @@ -513,6 +519,9 @@ struct rcar_canfd_global { enum rcar_canfd_fcanclk fcan; /* CANFD or Ext clock */ unsigned long channels_mask; /* Enabled channels mask */ bool fdmode; /* CAN FD or Classical CAN only mode */ + struct reset_control *rstc1; /* Pointer to reset source1 */ + struct reset_control *rstc2; /* Pointer to reset source2 */ + enum rcanfd_chip_id chip_id; }; /* CAN FD mode nominal rate constants */ @@ -1577,6 +1586,45 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch, priv->can.clock.freq = fcan_freq; dev_info(&pdev->dev, "can_clk rate is %u\n", priv->can.clock.freq); + if (gpriv->chip_id == RENESAS_RZG2L) { + char *irq_name; + int err_irq; + int tx_irq; + + err_irq = platform_get_irq_byname(pdev, ch == 0 ? "can0_error" : "can1_error"); + if (err_irq < 0) { + err = err_irq; + goto fail; + } + + tx_irq = platform_get_irq_byname(pdev, ch == 0 ? "can0_tx" : "can1_tx"); + if (tx_irq < 0) { + err = tx_irq; + goto fail; + } + + irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, + "canfd.chnerr%d", ch); + err = devm_request_irq(&pdev->dev, err_irq, + rcar_canfd_channel_interrupt, 0, + irq_name, gpriv); + if (err) { + dev_err(&pdev->dev, "devm_request_irq CH Err(%d) failed, error %d\n", + err_irq, err); + goto fail; + } + irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, + "canfd.chntx%d", ch); + err = devm_request_irq(&pdev->dev, tx_irq, + rcar_canfd_channel_interrupt, 0, + irq_name, gpriv); + if (err) { + dev_err(&pdev->dev, "devm_request_irq Tx (%d) failed, error %d\n", + tx_irq, err); + goto fail; + } + } + if (gpriv->fdmode) { priv->can.bittiming_const = &rcar_canfd_nom_bittiming_const; priv->can.data_bittiming_const = @@ -1635,8 +1683,11 @@ static int rcar_canfd_probe(struct platform_device *pdev) struct rcar_canfd_global *gpriv; struct device_node *of_child; unsigned long channels_mask = 0; - int err, ch_irq, g_irq; + int err, ch_irq, g_irq, g_rx_irq; bool fdmode = true; /* CAN FD only mode - default */ + enum rcanfd_chip_id chip_id; + + chip_id = (enum rcanfd_chip_id)of_device_get_match_data(&pdev->dev); if (of_property_read_bool(pdev->dev.of_node, "renesas,no-can-fd")) fdmode = false; /* Classical CAN only mode */ @@ -1649,27 +1700,64 @@ static int rcar_canfd_probe(struct platform_device *pdev) if (of_child && of_device_is_available(of_child)) channels_mask |= BIT(1); /* Channel 1 */ - ch_irq = platform_get_irq(pdev, 0); - if (ch_irq < 0) { - err = ch_irq; - goto fail_dev; - } + if (chip_id == RENESAS_RCAR_GEN3) { + ch_irq = platform_get_irq_byname(pdev, "ch_int"); + if (ch_irq < 0) { + /* For backward compatibility get irq by index */ + ch_irq = platform_get_irq(pdev, 0); + if (ch_irq < 0) + return ch_irq; + } - g_irq = platform_get_irq(pdev, 1); - if (g_irq < 0) { - err = g_irq; - goto fail_dev; + g_irq = platform_get_irq_byname(pdev, "g_int"); + if (g_irq < 0) { + /* For backward compatibility get irq by index */ + g_irq = platform_get_irq(pdev, 1); + if (g_irq < 0) + return g_irq; + } + } else { + g_irq = platform_get_irq_byname(pdev, "g_error"); + if (g_irq < 0) + return g_irq; + + g_rx_irq = platform_get_irq_byname(pdev, "g_rx_fifo"); + if (g_rx_irq < 0) + return g_rx_irq; } /* Global controller context */ gpriv = devm_kzalloc(&pdev->dev, sizeof(*gpriv), GFP_KERNEL); - if (!gpriv) { - err = -ENOMEM; - goto fail_dev; - } + if (!gpriv) + return -ENOMEM; + gpriv->pdev = pdev; gpriv->channels_mask = channels_mask; gpriv->fdmode = fdmode; + gpriv->chip_id = chip_id; + + if (gpriv->chip_id == RENESAS_RZG2L) { + gpriv->rstc1 = devm_reset_control_get_exclusive_by_index(&pdev->dev, 0); + if (IS_ERR(gpriv->rstc1)) { + dev_err(&pdev->dev, "failed to get reset index 0\n"); + return PTR_ERR(gpriv->rstc1); + } + + err = reset_control_reset(gpriv->rstc1); + if (err) + return err; + + gpriv->rstc2 = devm_reset_control_get_exclusive_by_index(&pdev->dev, 1); + if (IS_ERR(gpriv->rstc2)) { + dev_err(&pdev->dev, "failed to get reset index 1\n"); + return PTR_ERR(gpriv->rstc2); + } + err = reset_control_reset(gpriv->rstc2); + if (err) { + reset_control_assert(gpriv->rstc1); + return err; + } + } /* Peripheral clock */ gpriv->clkp = devm_clk_get(&pdev->dev, "fck"); @@ -1699,7 +1787,7 @@ static int rcar_canfd_probe(struct platform_device *pdev) } fcan_freq = clk_get_rate(gpriv->can_clk); - if (gpriv->fcan == RCANFD_CANFDCLK) + if (gpriv->fcan == RCANFD_CANFDCLK && gpriv->chip_id == RENESAS_RCAR_GEN3) /* CANFD clock is further divided by (1/2) within the IP */ fcan_freq /= 2; @@ -1711,21 +1799,43 @@ static int rcar_canfd_probe(struct platform_device *pdev) gpriv->base = addr; /* Request IRQ that's common for both channels */ - err = devm_request_irq(&pdev->dev, ch_irq, - rcar_canfd_channel_interrupt, 0, - "canfd.chn", gpriv); - if (err) { - dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n", - ch_irq, err); - goto fail_dev; - } - err = devm_request_irq(&pdev->dev, g_irq, - rcar_canfd_global_interrupt, 0, - "canfd.gbl", gpriv); - if (err) { - dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n", - g_irq, err); - goto fail_dev; + if (gpriv->chip_id == RENESAS_RCAR_GEN3) { + err = devm_request_irq(&pdev->dev, ch_irq, + rcar_canfd_channel_interrupt, 0, + "canfd.chn", gpriv); + if (err) { + dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n", + ch_irq, err); + goto fail_dev; + } + + err = devm_request_irq(&pdev->dev, g_irq, + rcar_canfd_global_interrupt, 0, + "canfd.gbl", gpriv); + if (err) { + dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n", + g_irq, err); + goto fail_dev; + } + } else { + err = devm_request_irq(&pdev->dev, g_rx_irq, + rcar_canfd_global_interrupt, 0, + "canfd.gblrx", gpriv); + + if (err) { + dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n", + g_rx_irq, err); + goto fail_dev; + } + + err = devm_request_irq(&pdev->dev, g_irq, + rcar_canfd_global_interrupt, 0, + "canfd.gblerr", gpriv); + if (err) { + dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n", + g_irq, err); + goto fail_dev; + } } /* Enable peripheral clock for register access */ @@ -1791,6 +1901,8 @@ static int rcar_canfd_probe(struct platform_device *pdev) fail_clk: clk_disable_unprepare(gpriv->clkp); fail_dev: + reset_control_assert(gpriv->rstc1); + reset_control_assert(gpriv->rstc2); return err; } @@ -1810,6 +1922,9 @@ static int rcar_canfd_remove(struct platform_device *pdev) /* Enter global sleep mode */ rcar_canfd_set_bit(gpriv->base, RCANFD_GCTR, RCANFD_GCTR_GSLPR); clk_disable_unprepare(gpriv->clkp); + reset_control_assert(gpriv->rstc1); + reset_control_assert(gpriv->rstc2); + return 0; } @@ -1827,7 +1942,8 @@ static SIMPLE_DEV_PM_OPS(rcar_canfd_pm_ops, rcar_canfd_suspend, rcar_canfd_resume); static const struct of_device_id rcar_canfd_of_table[] = { - { .compatible = "renesas,rcar-gen3-canfd" }, + { .compatible = "renesas,rcar-gen3-canfd", .data = (void *)RENESAS_RCAR_GEN3 }, + { .compatible = "renesas,rzg2l-canfd", .data = (void *)RENESAS_RZG2L }, { } };