From patchwork Mon Dec 19 14:42:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Witold Sadowski X-Patchwork-Id: 635563 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 08C75C4332F for ; Mon, 19 Dec 2022 14:43:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229794AbiLSOn1 (ORCPT ); Mon, 19 Dec 2022 09:43:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45618 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231926AbiLSOnU (ORCPT ); Mon, 19 Dec 2022 09:43:20 -0500 Received: from mx0b-0016f401.pphosted.com (mx0a-0016f401.pphosted.com [67.231.148.174]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 680596369; Mon, 19 Dec 2022 06:43:19 -0800 (PST) Received: from pps.filterd (m0045849.ppops.net [127.0.0.1]) by mx0a-0016f401.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 2BJ9PoPe009678; Mon, 19 Dec 2022 06:43:12 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=marvell.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=pfpt0220; bh=D0oUrq7Lqfz+ranVw2W6f2mza1kwCbji745cITFuHqc=; b=IC6C/QZbgLLEmPwZeJMmOrZMMy8NvWNxm8DmsjxTokUWJPbJuYMapxiaOGWc124o4ViD qGMOIFC7yYetQM4tm+sLQtjCYZnQJ1O2H6eSjufbg37tC4BWChEElIhrAfbZCemSV9Ny vLtJ7s9il1PMiSJr+cuGMjH3y0kZpWSDoIavISGWh7OOEwu77yu1LlwebZxzvKGEjZUw BTRdpSbKq23RCkFl0yU5yirECA06MLSWVtphATiN0wmIkldXdksPEn0hT5cheQFdRr79 lyNLs3VQqlZdT2m1oe5dh4Kl61Ygd9HepcIUz3w9ONwbhWXTrBjuSbOBQjgtXdIg2g5N dg== Received: from dc5-exch01.marvell.com ([199.233.59.181]) by mx0a-0016f401.pphosted.com (PPS) with ESMTPS id 3mjnans4hr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Mon, 19 Dec 2022 06:43:12 -0800 Received: from DC5-EXCH02.marvell.com (10.69.176.39) by DC5-EXCH01.marvell.com (10.69.176.38) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Mon, 19 Dec 2022 06:43:10 -0800 Received: from maili.marvell.com (10.69.176.80) by DC5-EXCH02.marvell.com (10.69.176.39) with Microsoft SMTP Server id 15.0.1497.42 via Frontend Transport; Mon, 19 Dec 2022 06:43:10 -0800 Received: from localhost.localdomain (unknown [10.110.150.170]) by maili.marvell.com (Postfix) with ESMTP id 978CF3F7091; Mon, 19 Dec 2022 06:43:10 -0800 (PST) From: Witold Sadowski To: CC: , , , , , , , , Subject: [PATCH 3/7] spi: cadence: Add polling mode support Date: Mon, 19 Dec 2022 06:42:50 -0800 Message-ID: <20221219144254.20883-4-wsadowski@marvell.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221219144254.20883-1-wsadowski@marvell.com> References: <20221219144254.20883-1-wsadowski@marvell.com> MIME-Version: 1.0 X-Proofpoint-GUID: xnGTGLksJn9DNQqJ4GRphIe_1LLxm7ET X-Proofpoint-ORIG-GUID: xnGTGLksJn9DNQqJ4GRphIe_1LLxm7ET X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-19_01,2022-12-15_02,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org If IRQ is not configured, switch driver to polling mode instead of returning with error. Code is using SDMA interrupt flag to determine SDMA operation status, and stig ready flag to determine stig engine readiness. Signed-off-by: Witold Sadowski Reviewed-by: Chandrakala Chavva Reviewed-by: Sunil Kovvuri Goutham --- drivers/spi/spi-cadence-xspi.c | 66 +++++++++++++++++++++++++++------- 1 file changed, 53 insertions(+), 13 deletions(-) diff --git a/drivers/spi/spi-cadence-xspi.c b/drivers/spi/spi-cadence-xspi.c index 91db3c973167..25db0d55d5ef 100644 --- a/drivers/spi/spi-cadence-xspi.c +++ b/drivers/spi/spi-cadence-xspi.c @@ -190,6 +190,9 @@ ((op)->data.dir == SPI_MEM_DATA_IN) ? \ CDNS_XSPI_STIG_CMD_DIR_READ : CDNS_XSPI_STIG_CMD_DIR_WRITE)) +#define CDNS_XSPI_POLL_TIMEOUT_US 1000 +#define CDNS_XSPI_POLL_DELAY_US 10 + enum cdns_xspi_stig_instr_type { CDNS_XSPI_STIG_INSTR_TYPE_0, CDNS_XSPI_STIG_INSTR_TYPE_1, @@ -293,6 +296,9 @@ static void cdns_xspi_set_interrupts(struct cdns_xspi_dev *cdns_xspi, { u32 intr_enable; + if (!cdns_xspi->irq) + return; + intr_enable = readl(cdns_xspi->iobase + CDNS_XSPI_INTR_ENABLE_REG); if (enabled) intr_enable |= CDNS_XSPI_INTR_MASK; @@ -345,6 +351,28 @@ static void cdns_xspi_sdma_handle(struct cdns_xspi_dev *cdns_xspi) } } +bool cdns_xspi_stig_ready(struct cdns_xspi_dev *cdns_xspi) +{ + u32 ctrl_stat; + + return readl_relaxed_poll_timeout + (cdns_xspi->iobase + CDNS_XSPI_CTRL_STATUS_REG, + ctrl_stat, + ((ctrl_stat & BIT(3)) == 0), + CDNS_XSPI_POLL_DELAY_US, CDNS_XSPI_POLL_TIMEOUT_US); +} + +bool cdns_xspi_sdma_ready(struct cdns_xspi_dev *cdns_xspi) +{ + u32 ctrl_stat; + + return readl_relaxed_poll_timeout + (cdns_xspi->iobase + CDNS_XSPI_INTR_STATUS_REG, + ctrl_stat, + (ctrl_stat & CDNS_XSPI_SDMA_TRIGGER), + CDNS_XSPI_POLL_DELAY_US, CDNS_XSPI_POLL_TIMEOUT_US); +} + static int cdns_xspi_send_stig_command(struct cdns_xspi_dev *cdns_xspi, const struct spi_mem_op *op, bool data_phase) @@ -385,16 +413,26 @@ static int cdns_xspi_send_stig_command(struct cdns_xspi_dev *cdns_xspi, cdns_xspi_trigger_command(cdns_xspi, cmd_regs); - wait_for_completion(&cdns_xspi->sdma_complete); - if (cdns_xspi->sdma_error) { - cdns_xspi_set_interrupts(cdns_xspi, false); - return -EIO; + if (cdns_xspi->irq) { + wait_for_completion(&cdns_xspi->sdma_complete); + if (cdns_xspi->sdma_error) { + cdns_xspi_set_interrupts(cdns_xspi, false); + return -EIO; + } + } else { + if (cdns_xspi_sdma_ready(cdns_xspi)) + return -EIO; } cdns_xspi_sdma_handle(cdns_xspi); } - wait_for_completion(&cdns_xspi->cmd_complete); - cdns_xspi_set_interrupts(cdns_xspi, false); + if (cdns_xspi->irq) { + wait_for_completion(&cdns_xspi->cmd_complete); + cdns_xspi_set_interrupts(cdns_xspi, false); + } else { + if (cdns_xspi_stig_ready(cdns_xspi)) + return -EIO; + } cmd_status = cdns_xspi_check_command_status(cdns_xspi); if (cmd_status) @@ -580,13 +618,15 @@ static int cdns_xspi_probe(struct platform_device *pdev) cdns_xspi->irq = platform_get_irq(pdev, 0); if (cdns_xspi->irq < 0) - return -ENXIO; - - ret = devm_request_irq(dev, cdns_xspi->irq, cdns_xspi_irq_handler, - IRQF_SHARED, pdev->name, cdns_xspi); - if (ret) { - dev_err(dev, "Failed to request IRQ: %d\n", cdns_xspi->irq); - return ret; + cdns_xspi->irq = 0; + + if (cdns_xspi->irq) { + ret = devm_request_irq(dev, cdns_xspi->irq, cdns_xspi_irq_handler, + IRQF_SHARED, pdev->name, cdns_xspi); + if (ret) { + dev_err(dev, "Failed to request IRQ: %d\n", cdns_xspi->irq); + return ret; + } } cdns_xspi_print_phy_config(cdns_xspi);