From patchwork Mon Apr 15 21:30:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sowjanya Komatineni X-Patchwork-Id: 10901607 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 480871390 for ; Mon, 15 Apr 2019 21:31:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 30131287D1 for ; Mon, 15 Apr 2019 21:31:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2348928806; Mon, 15 Apr 2019 21:31:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9BA53287D1 for ; Mon, 15 Apr 2019 21:31:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728333AbfDOVbH (ORCPT ); Mon, 15 Apr 2019 17:31:07 -0400 Received: from hqemgate14.nvidia.com ([216.228.121.143]:16562 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727720AbfDOVbD (ORCPT ); Mon, 15 Apr 2019 17:31:03 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate14.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Mon, 15 Apr 2019 14:31:07 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Mon, 15 Apr 2019 14:31:02 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Mon, 15 Apr 2019 14:31:02 -0700 Received: from HQMAIL104.nvidia.com (172.18.146.11) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Mon, 15 Apr 2019 21:31:02 +0000 Received: from hqnvemgw02.nvidia.com (172.16.227.111) by HQMAIL104.nvidia.com (172.18.146.11) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Mon, 15 Apr 2019 21:31:02 +0000 Received: from skomatineni-linux.nvidia.com (Not Verified[10.2.167.253]) by hqnvemgw02.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Mon, 15 Apr 2019 14:31:01 -0700 From: Sowjanya Komatineni To: , , , , , , , CC: , , , , Subject: [PATCH V3 8/9] spi: tegra114: add support for HW CS timing Date: Mon, 15 Apr 2019 14:30:33 -0700 Message-ID: <1555363834-32155-9-git-send-email-skomatineni@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1555363834-32155-1-git-send-email-skomatineni@nvidia.com> References: <1555363834-32155-1-git-send-email-skomatineni@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1555363867; bh=A94h6uldvG7Tt28/1mb1Np7gj5xR8WK+6QueAF0A/vM=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=EtVP7xnGOE0AmjeW0scoV4IBHbj6OUKTx3W9LzyLTAlOl17NWJlowqyakqfTejf8v IBSy3zfnfokl/bsrvcKZ5P6C7hDLwBQpSxAJhC9D6dS7JCqK6DYskeny+4c0AVDbHo WQFnpZ5ZGvQ1eUgarmTtMV+eLegPjq2WRhA9VNPRczHy2JnKZ8H1ghptkvxw6tbEG3 q4d6RGK3HqgTmVfssLeKCDiju3JebRiQlov7ho8JWxstLKaW2mR3VxuMvR3Qj2FoC+ 73dhavDdPlb6X2HZ11NPQWe8SVMsvnI3qxbvoWj9XEnyscDoh89WP1MWC819Ff7P2L 02v2kNEYO7RVw== Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch implements set_cs_timing SPI controller method to allow SPI client driver to configure device specific SPI CS timings. Signed-off-by: Sowjanya Komatineni --- drivers/spi/spi-tegra114.c | 48 ++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 46 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c index 732347d83366..8476a38cf4fb 100644 --- a/drivers/spi/spi-tegra114.c +++ b/drivers/spi/spi-tegra114.c @@ -95,8 +95,10 @@ (reg = (((val) & 0x1) << ((cs) * 8 + 5)) | \ ((reg) & ~(1 << ((cs) * 8 + 5)))) #define SPI_SET_CYCLES_BETWEEN_PACKETS(reg, cs, val) \ - (reg = (((val) & 0xF) << ((cs) * 8)) | \ - ((reg) & ~(0xF << ((cs) * 8)))) + (reg = (((val) & 0x1F) << ((cs) * 8)) | \ + ((reg) & ~(0x1F << ((cs) * 8)))) +#define MAX_SETUP_HOLD_CYCLES 16 +#define MAX_INACTIVE_CYCLES 32 #define SPI_TRANS_STATUS 0x010 #define SPI_BLK_CNT(val) (((val) >> 0) & 0xFFFF) @@ -206,6 +208,8 @@ struct tegra_spi_data { u32 command1_reg; u32 dma_control_reg; u32 def_command1_reg; + u32 spi_cs_timing1; + u32 spi_cs_timing2; struct completion xfer_completion; struct spi_transfer *curr_xfer; @@ -723,6 +727,43 @@ static void tegra_spi_deinit_dma_param(struct tegra_spi_data *tspi, dma_release_channel(dma_chan); } +static void tegra_spi_set_hw_cs_timing(struct spi_device *spi, u8 setup_dly, + u8 hold_dly, u8 inactive_dly) +{ + struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); + u32 setup_hold; + u32 spi_cs_timing; + u32 inactive_cycles; + u8 cs_state; + + setup_dly = min_t(u8, setup_dly, MAX_SETUP_HOLD_CYCLES); + hold_dly = min_t(u8, hold_dly, MAX_SETUP_HOLD_CYCLES); + if (setup_dly && hold_dly) { + setup_hold = SPI_SETUP_HOLD(setup_dly - 1, hold_dly - 1); + spi_cs_timing = SPI_CS_SETUP_HOLD(tspi->spi_cs_timing1, + spi->chip_select, + setup_hold); + if (tspi->spi_cs_timing1 != spi_cs_timing) { + tspi->spi_cs_timing1 = spi_cs_timing; + tegra_spi_writel(tspi, spi_cs_timing, SPI_CS_TIMING1); + } + } + + inactive_cycles = min_t(u8, inactive_dly, MAX_INACTIVE_CYCLES); + if (inactive_cycles) + inactive_cycles--; + cs_state = inactive_cycles ? 0 : 1; + spi_cs_timing = tspi->spi_cs_timing2; + SPI_SET_CS_ACTIVE_BETWEEN_PACKETS(spi_cs_timing, spi->chip_select, + cs_state); + SPI_SET_CYCLES_BETWEEN_PACKETS(spi_cs_timing, spi->chip_select, + inactive_cycles); + if (tspi->spi_cs_timing2 != spi_cs_timing) { + tspi->spi_cs_timing2 = spi_cs_timing; + tegra_spi_writel(tspi, spi_cs_timing, SPI_CS_TIMING2); + } +} + static u32 tegra_spi_setup_transfer_one(struct spi_device *spi, struct spi_transfer *t, bool is_first_of_msg, bool is_single_xfer) @@ -1232,6 +1273,7 @@ static int tegra_spi_probe(struct platform_device *pdev) master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); master->setup = tegra_spi_setup; master->transfer_one_message = tegra_spi_transfer_one_message; + master->set_cs_timing = tegra_spi_set_hw_cs_timing; master->num_chipselect = MAX_CHIP_SELECT; master->auto_runtime_pm = true; bus_num = of_alias_get_id(pdev->dev.of_node, "spi"); @@ -1307,6 +1349,8 @@ static int tegra_spi_probe(struct platform_device *pdev) reset_control_deassert(tspi->rst); tspi->def_command1_reg = SPI_M_S; tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); + tspi->spi_cs_timing1 = tegra_spi_readl(tspi, SPI_CS_TIMING1); + tspi->spi_cs_timing2 = tegra_spi_readl(tspi, SPI_CS_TIMING2); pm_runtime_put(&pdev->dev); ret = request_threaded_irq(tspi->irq, tegra_spi_isr, tegra_spi_isr_thread, IRQF_ONESHOT,