From patchwork Thu Jan 18 08:20:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikita Shubin via B4 Relay X-Patchwork-Id: 763884 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C456413FF8; Thu, 18 Jan 2024 08:22:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705566179; cv=none; b=utaodEae1XUZhPHLxjTRkHogp/chnBDTul0oCa/KH6GdcE948GQ8u8mEDjta3x8xOAhYHnXcB4diRd4x9L6v36hwf+3d63jL3sTF4B4fjbYFdpAxWf9k/F9jjYIG9mqDu56zPO5mSBg92/dFdUe0lVr5uzjzduiFlFdwSjaaJD0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705566179; c=relaxed/simple; bh=YmGPmanXocW8O4jITzcpLvtJ6lKasupJRwaKBGtXVPk=; 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b=QQmDlXv9g5xX/QNi8V4YqlCTLKj37vtcUmy3UGlmuqGtqqUiXgv3qa1bPh4ux0WVx vQgxlyawd7NOTudj93FiK5fJfcYIkwfZ/1n2a3zoFp8al60QgPk3CesWNcaJLpgAUA 3peRfB3+6TXcz05OhrXw/wTwuqtqIBf0NeQ/sLAm3KshzUtlAk84xcYTwcq30VI03O qZLGSKbg3I8VzEnkg+xu5BPcOdn4eWGvhGSgdypr/mvCuaCcYwtjQnSRa3oSS3NVKd GcxHlH0Ds26vTOCeXXQsevnhzwABRHGZt0BN8HOTUAXcJaPuZrVPHIRsb9/jQpmhfx Rp/n4AY52RT6A== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D021C4707B; Thu, 18 Jan 2024 08:22:59 +0000 (UTC) From: Nikita Shubin via B4 Relay Date: Thu, 18 Jan 2024 11:20:59 +0300 Subject: [PATCH v7 16/39] spi: ep93xx: add DT support for Cirrus EP93xx Precedence: bulk X-Mailing-List: linux-spi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240118-ep93xx-v7-16-d953846ae771@maquefel.me> References: <20240118-ep93xx-v7-0-d953846ae771@maquefel.me> In-Reply-To: <20240118-ep93xx-v7-0-d953846ae771@maquefel.me> To: Mark Brown Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, Arnd Bergmann X-Mailer: b4 0.13-dev-e3e53 X-Developer-Signature: v=1; a=ed25519-sha256; t=1705566176; l=4901; i=nikita.shubin@maquefel.me; s=20230718; h=from:subject:message-id; bh=8M/HAUqJd+W8e9O32fFZUixHr6QBzfilxUR9p65XK5c=; =?utf-8?q?b=3D8MnfTKdIWVIm?= =?utf-8?q?TgBXysZSNUoR/ayBBQmaXdDKAZGWzIpgyuVcJya1am6A3vYzG88ovMBpNl6vXrZ4?= IfE14pvkCddbLKBvRbYh+RJn6cbCHbP1xbOU+kz7+vFtfmTtuYyc X-Developer-Key: i=nikita.shubin@maquefel.me; a=ed25519; pk=vqf5YIUJ7BJv3EJFaNNxWZgGuMgDH6rwufTLflwU9ac= X-Endpoint-Received: by B4 Relay for nikita.shubin@maquefel.me/20230718 with auth_id=65 X-Original-From: Nikita Shubin Reply-To: From: Nikita Shubin - add OF ID match table - add device tree DMA request, so we can probe defer, in case DMA is not ready yet - drop DMA platform code Reviewed-by: Linus Walleij Tested-by: Alexander Sverdlin Acked-by: Alexander Sverdlin Reviewed-by: Mark Brown Signed-off-by: Nikita Shubin --- drivers/spi/spi-ep93xx.c | 66 +++++++++++++++++------------------------------- 1 file changed, 23 insertions(+), 43 deletions(-) diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c index a1d60e51c053..ffbe0d522bce 100644 --- a/drivers/spi/spi-ep93xx.c +++ b/drivers/spi/spi-ep93xx.c @@ -18,18 +18,18 @@ #include #include #include +#include +#include #include #include #include #include +#include #include #include #include #include -#include -#include - #define SSPCR0 0x0000 #define SSPCR0_SPO BIT(6) #define SSPCR0_SPH BIT(7) @@ -92,8 +92,6 @@ struct ep93xx_spi { size_t fifo_level; struct dma_chan *dma_rx; struct dma_chan *dma_tx; - struct ep93xx_dma_data dma_rx_data; - struct ep93xx_dma_data dma_tx_data; struct sg_table rx_sgt; struct sg_table tx_sgt; void *zeropage; @@ -575,46 +573,23 @@ static int ep93xx_spi_unprepare_hardware(struct spi_controller *host) return 0; } -static bool ep93xx_spi_dma_filter(struct dma_chan *chan, void *filter_param) +static int ep93xx_spi_setup_dma(struct device *dev, struct ep93xx_spi *espi) { - if (ep93xx_dma_chan_is_m2p(chan)) - return false; - - chan->private = filter_param; - return true; -} - -static int ep93xx_spi_setup_dma(struct ep93xx_spi *espi) -{ - dma_cap_mask_t mask; int ret; espi->zeropage = (void *)get_zeroed_page(GFP_KERNEL); if (!espi->zeropage) return -ENOMEM; - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - - espi->dma_rx_data.port = EP93XX_DMA_SSP; - espi->dma_rx_data.direction = DMA_DEV_TO_MEM; - espi->dma_rx_data.name = "ep93xx-spi-rx"; - - espi->dma_rx = dma_request_channel(mask, ep93xx_spi_dma_filter, - &espi->dma_rx_data); - if (!espi->dma_rx) { - ret = -ENODEV; + espi->dma_rx = dma_request_chan(dev, "rx"); + if (IS_ERR(espi->dma_rx)) { + ret = dev_err_probe(dev, PTR_ERR(espi->dma_rx), "rx DMA setup failed"); goto fail_free_page; } - espi->dma_tx_data.port = EP93XX_DMA_SSP; - espi->dma_tx_data.direction = DMA_MEM_TO_DEV; - espi->dma_tx_data.name = "ep93xx-spi-tx"; - - espi->dma_tx = dma_request_channel(mask, ep93xx_spi_dma_filter, - &espi->dma_tx_data); - if (!espi->dma_tx) { - ret = -ENODEV; + espi->dma_tx = dma_request_chan(dev, "tx"); + if (IS_ERR(espi->dma_tx)) { + ret = dev_err_probe(dev, PTR_ERR(espi->dma_tx), "tx DMA setup failed"); goto fail_release_rx; } @@ -647,18 +622,11 @@ static void ep93xx_spi_release_dma(struct ep93xx_spi *espi) static int ep93xx_spi_probe(struct platform_device *pdev) { struct spi_controller *host; - struct ep93xx_spi_info *info; struct ep93xx_spi *espi; struct resource *res; int irq; int error; - info = dev_get_platdata(&pdev->dev); - if (!info) { - dev_err(&pdev->dev, "missing platform data\n"); - return -EINVAL; - } - irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; @@ -713,12 +681,17 @@ static int ep93xx_spi_probe(struct platform_device *pdev) goto fail_release_host; } - if (info->use_dma && ep93xx_spi_setup_dma(espi)) + error = ep93xx_spi_setup_dma(&pdev->dev, espi); + if (error == -EPROBE_DEFER) + goto fail_release_host; + + if (error) dev_warn(&pdev->dev, "DMA setup failed. Falling back to PIO\n"); /* make sure that the hardware is disabled */ writel(0, espi->mmio + SSPCR1); + device_set_node(&host->dev, dev_fwnode(&pdev->dev)); error = devm_spi_register_controller(&pdev->dev, host); if (error) { dev_err(&pdev->dev, "failed to register SPI host\n"); @@ -746,9 +719,16 @@ static void ep93xx_spi_remove(struct platform_device *pdev) ep93xx_spi_release_dma(espi); } +static const struct of_device_id ep93xx_spi_of_ids[] = { + { .compatible = "cirrus,ep9301-spi" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, ep93xx_spi_of_ids); + static struct platform_driver ep93xx_spi_driver = { .driver = { .name = "ep93xx-spi", + .of_match_table = ep93xx_spi_of_ids, }, .probe = ep93xx_spi_probe, .remove_new = ep93xx_spi_remove,