From patchwork Tue Mar 21 11:58:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joy Chakraborty X-Patchwork-Id: 13182664 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 ACE14C74A5B for ; Tue, 21 Mar 2023 11:59:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230143AbjCUL7L (ORCPT ); Tue, 21 Mar 2023 07:59:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230136AbjCUL7L (ORCPT ); Tue, 21 Mar 2023 07:59:11 -0400 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ADE92158B7 for ; Tue, 21 Mar 2023 04:59:06 -0700 (PDT) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-536d63d17dbso152776997b3.22 for ; Tue, 21 Mar 2023 04:59:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1679399945; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=r8A+qj8whaa2EVpkeoxnnh/JzSlsp2fevSoVTdtS9NA=; b=FHQCwsAW8fqwW3qGdSmkBeKZRwCBfzkqolPbAv31wLjIIw6kRYe+ei6tVVhL9K1Woy ltpIynSNN4Az+JJIpalXS26/Rq8SsT1ZjpOao2W3wjmFwspyl5NiH7g8QttxH/seA7zX tE0uQCXVZCdgWUXr+tVOtr9ZtjWqlu7TZCRXRuP2UWPdqcuH7WwO4BZ/CsQX/7DOwuIa iWkIcRdaz6PD7huMjKK+irzdzjTtQwY0r5hdvUH9Lrl8di1JQ6nCNa5DVdRTSoMBMqhd tgoZt6+ON+L4fVHfMV2nQ417zB8i35Zx+2+ulkhCMX7pclxf9TZWjlp5419kZxQ0AOzZ biJw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679399945; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=r8A+qj8whaa2EVpkeoxnnh/JzSlsp2fevSoVTdtS9NA=; b=3NAbjT0GMja1qWnD9s4I9DL00sLzOMrKSEj8eOkzdpZgJnmSkErPBYoct8W/uyfc0U RVpev9Hf9Cc38DchbGeTBbS3JvbycNo8fTECJomNn2jW2A0Xu36ByAXRkKUG2b0ev47k rcUUqXmuNM4lMkaJNSudEaxs3dwYsicY6hi6QSiG4+BNKg13zmKM/YkBwl9faCuB1N5n SESU6fCF9Npv6PgPM2jGOlEvQH46eykvpDFiu95CsAjUQjTYH9rBn3sIVSMrv7/9gY5R E2cTB3/1zTBWG9NOVYEgINAwv6lA4z9xE6MyKMNlGF3bWDcyAHXLF454fMeLPJcJOIVy bAqQ== X-Gm-Message-State: AAQBX9fOK4kfl0M7NF23EinaGZCkq73/9GpEyyGTS1JE3HtcGVTfV6Aa 9k5qYDE8MpkAswgcZFzUwoia4sEnuDHD7w== X-Google-Smtp-Source: AKy350bcv35XCLD/YwBf/zYbbuW/VK4IOexHg+oZOgcpzwF9LW/+8TF8PnhwPAvl59Ik/aktxYjExneqKdSdkw== X-Received: from joychakr.c.googlers.com ([fda3:e722:ac3:cc00:4f:4b78:c0a8:6ea]) (user=joychakr job=sendgmr) by 2002:a25:8a0e:0:b0:b30:8d4b:230e with SMTP id g14-20020a258a0e000000b00b308d4b230emr1006235ybl.7.1679399945431; Tue, 21 Mar 2023 04:59:05 -0700 (PDT) Date: Tue, 21 Mar 2023 11:58:43 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.40.0.rc1.284.g88254d51c5-goog Message-ID: <20230321115843.2688472-1-joychakr@google.com> Subject: [PATCH v2] spi: dw: Add 32 bpw support to DW DMA Controller From: Joy Chakraborty To: Serge Semin , Mark Brown Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, manugautam@google.com, rohitner@google.com, Joy Chakraborty Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org If DW Controller is capable of a maximum of 32 bits per word then SW or DMA controller has to write up to 32bit or 4byte data to the FIFO at a time. This Patch adds support for AxSize = 4 bytes configuration from dw dma driver if n_bytes i.e. number of bytes per write to fifo is 3 or 4. It also checks to see if the dma controller is capable of satisfying the width requirement to achieve a particular bits/word requirement per transfer. Signed-off-by: Joy Chakraborty --- drivers/spi/spi-dw-dma.c | 37 ++++++++++++++++++++++++++++++++----- drivers/spi/spi-dw.h | 1 + 2 files changed, 33 insertions(+), 5 deletions(-) diff --git a/drivers/spi/spi-dw-dma.c b/drivers/spi/spi-dw-dma.c index ababb910b391..9ac3a1c25e2d 100644 --- a/drivers/spi/spi-dw-dma.c +++ b/drivers/spi/spi-dw-dma.c @@ -23,6 +23,8 @@ #define DW_SPI_TX_BUSY 1 #define DW_SPI_TX_BURST_LEVEL 16 +static inline enum dma_slave_buswidth dw_spi_dma_convert_width(u8 n_bytes); + static bool dw_spi_dma_chan_filter(struct dma_chan *chan, void *param) { struct dw_dma_slave *s = param; @@ -89,6 +91,16 @@ static void dw_spi_dma_sg_burst_init(struct dw_spi *dws) dws->dma_sg_burst = 0; } +static void dw_spi_dma_addr_widths_init(struct dw_spi *dws) +{ + struct dma_slave_caps tx = {0}, rx = {0}; + + dma_get_slave_caps(dws->txchan, &tx); + dma_get_slave_caps(dws->rxchan, &rx); + + dws->dma_addr_widths = tx.dst_addr_widths & rx.src_addr_widths; +} + static int dw_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) { struct dw_dma_slave dma_tx = { .dst_id = 1 }, *tx = &dma_tx; @@ -128,6 +140,8 @@ static int dw_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) dw_spi_dma_sg_burst_init(dws); + dw_spi_dma_addr_widths_init(dws); + pci_dev_put(dma_dev); return 0; @@ -167,6 +181,8 @@ static int dw_spi_dma_init_generic(struct device *dev, struct dw_spi *dws) dw_spi_dma_sg_burst_init(dws); + dw_spi_dma_addr_widths_init(dws); + return 0; free_rxchan: @@ -202,18 +218,29 @@ static bool dw_spi_can_dma(struct spi_controller *master, struct spi_device *spi, struct spi_transfer *xfer) { struct dw_spi *dws = spi_controller_get_devdata(master); + enum dma_slave_buswidth dma_bus_width; - return xfer->len > dws->fifo_len; + if (xfer->len > dws->fifo_len) { + dma_bus_width = dw_spi_dma_convert_width(dws->n_bytes); + if (dws->dma_addr_widths & BIT(dma_bus_width)) + return true; + } + return false; } static enum dma_slave_buswidth dw_spi_dma_convert_width(u8 n_bytes) { - if (n_bytes == 1) + switch (n_bytes) { + case 1: return DMA_SLAVE_BUSWIDTH_1_BYTE; - else if (n_bytes == 2) + case 2: return DMA_SLAVE_BUSWIDTH_2_BYTES; - - return DMA_SLAVE_BUSWIDTH_UNDEFINED; + case 3: + case 4: + return DMA_SLAVE_BUSWIDTH_4_BYTES; + default: + return DMA_SLAVE_BUSWIDTH_UNDEFINED; + } } static int dw_spi_dma_wait(struct dw_spi *dws, unsigned int len, u32 speed) diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h index 9e8eb2b52d5c..3962e6dcf880 100644 --- a/drivers/spi/spi-dw.h +++ b/drivers/spi/spi-dw.h @@ -190,6 +190,7 @@ struct dw_spi { struct dma_chan *rxchan; u32 rxburst; u32 dma_sg_burst; + u32 dma_addr_widths; unsigned long dma_chan_busy; dma_addr_t dma_addr; /* phy address of the Data register */ const struct dw_spi_dma_ops *dma_ops;