From mboxrd@z Thu Jan 1 00:00:00 1970 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,URIBL_BLOCKED,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 00355C2BBCD for ; Wed, 16 Dec 2020 02:29:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D5DBE22E03 for ; Wed, 16 Dec 2020 02:28:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725917AbgLPC2o (ORCPT ); Tue, 15 Dec 2020 21:28:44 -0500 Received: from mga05.intel.com ([192.55.52.43]:7307 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725287AbgLPC2n (ORCPT ); Tue, 15 Dec 2020 21:28:43 -0500 IronPort-SDR: srFcT549d7kgaDOtzzLfNllKYJEEmj0xa2o4UXqvRWI1sdMeKrlUr0LKhicAGnMprhQbgShvts mQGTMpLkxLEg== X-IronPort-AV: E=McAfee;i="6000,8403,9836"; a="259716479" X-IronPort-AV: E=Sophos;i="5.78,423,1599548400"; d="scan'208";a="259716479" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Dec 2020 18:27:20 -0800 IronPort-SDR: JJfa2C1iy82dSnYZBQQMbjUSgxpl+kUoEIfZxLhf5qrkK9ySvF2Th0IW8b1WVdEVLqBZ339f0f 6bj4GEO7582A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.78,423,1599548400"; d="scan'208";a="557080854" Received: from jsia-hp-z620-workstation.png.intel.com ([10.221.118.135]) by orsmga005.jf.intel.com with ESMTP; 15 Dec 2020 18:27:18 -0800 From: Sia Jee Heng To: vkoul@kernel.org, Eugeniy.Paltsev@synopsys.com, robh+dt@kernel.org Cc: andriy.shevchenko@linux.intel.com, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v7 14/16] dmaengine: dw-axi-dmac: Add Intel KeemBay AxiDMA BYTE and HALFWORD registers Date: Wed, 16 Dec 2020 10:10:01 +0800 Message-Id: <20201216021003.26911-15-jee.heng.sia@intel.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20201216021003.26911-1-jee.heng.sia@intel.com> References: <20201216021003.26911-1-jee.heng.sia@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add support for Intel KeemBay AxiDMA BYTE and HALFWORD registers programming. Intel KeemBay AxiDMA supports data transfer between device to memory and memory to device operations. This code is needed by I2C, I3C, I2S, SPI and UART which uses FIFO size of 8bits and 16bits to perform memory to device data transfer operation. 0-padding functionality is provided to avoid pre-processing of data on CPU. Reviewed-by: Andy Shevchenko Signed-off-by: Sia Jee Heng --- .../dma/dw-axi-dmac/dw-axi-dmac-platform.c | 44 ++++++++++++++++--- 1 file changed, 39 insertions(+), 5 deletions(-) diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c index 440f9a8b25da..dc7ddf98fd04 100644 --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c @@ -312,7 +312,7 @@ static void axi_chan_block_xfer_start(struct axi_dma_chan *chan, struct axi_dma_desc *first) { u32 priority = chan->chip->dw->hdata->priority[chan->id]; - u32 reg, irq_mask; + u32 reg, irq_mask, reg_width, offset, val; u8 lms = 0; /* Select AXI0 master for LLI fetching */ if (unlikely(axi_chan_is_hw_enable(chan))) { @@ -334,6 +334,25 @@ static void axi_chan_block_xfer_start(struct axi_dma_chan *chan, DWAXIDMAC_HS_SEL_HW << CH_CFG_H_HS_SEL_SRC_POS); switch (chan->direction) { case DMA_MEM_TO_DEV: + if (chan->chip->apb_regs) { + reg_width = __ffs(chan->config.dst_addr_width); + /* + * Configure Byte and Halfword register + * for MEM_TO_DEV only. + */ + if (reg_width == DWAXIDMAC_TRANS_WIDTH_16) { + offset = DMAC_APB_HALFWORD_WR_CH_EN; + val = ioread32(chan->chip->apb_regs + offset); + val |= BIT(chan->id); + iowrite32(val, chan->chip->apb_regs + offset); + } else if (reg_width == DWAXIDMAC_TRANS_WIDTH_8) { + offset = DMAC_APB_BYTE_WR_CH_EN; + val = ioread32(chan->chip->apb_regs + offset); + val |= BIT(chan->id); + iowrite32(val, chan->chip->apb_regs + offset); + } + } + reg |= (chan->config.device_fc ? DWAXIDMAC_TT_FC_MEM_TO_PER_DST : DWAXIDMAC_TT_FC_MEM_TO_PER_DMAC) @@ -994,8 +1013,9 @@ static int dma_chan_terminate_all(struct dma_chan *dchan) { struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan); u32 chan_active = BIT(chan->id) << DMAC_CHAN_EN_SHIFT; + u32 reg_width = __ffs(chan->config.dst_addr_width); unsigned long flags; - u32 val; + u32 offset, val; int ret; LIST_HEAD(head); @@ -1007,9 +1027,23 @@ static int dma_chan_terminate_all(struct dma_chan *dchan) dev_warn(dchan2dev(dchan), "%s failed to stop\n", axi_chan_name(chan)); - if (chan->direction != DMA_MEM_TO_MEM) - dw_axi_dma_set_hw_channel(chan->chip, - chan->hw_handshake_num, false); + if (chan->direction != DMA_MEM_TO_MEM) { + ret = dw_axi_dma_set_hw_channel(chan->chip, + chan->hw_handshake_num, false); + if (ret == 0 && chan->direction == DMA_MEM_TO_DEV) { + if (reg_width == DWAXIDMAC_TRANS_WIDTH_8) { + offset = DMAC_APB_BYTE_WR_CH_EN; + val = ioread32(chan->chip->apb_regs + offset); + val &= ~BIT(chan->id); + iowrite32(val, chan->chip->apb_regs + offset); + } else if (reg_width == DWAXIDMAC_TRANS_WIDTH_16) { + offset = DMAC_APB_HALFWORD_WR_CH_EN; + val = ioread32(chan->chip->apb_regs + offset); + val &= ~BIT(chan->id); + iowrite32(val, chan->chip->apb_regs + offset); + } + } + } spin_lock_irqsave(&chan->vc.lock, flags); -- 2.18.0