From patchwork Tue May 6 02:12:48 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robin Gong X-Patchwork-Id: 4118651 X-Patchwork-Delegate: vinod.koul@intel.com Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 4CD999F23C for ; Tue, 6 May 2014 02:06:52 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 18F66201F2 for ; Tue, 6 May 2014 02:06:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9C767201D3 for ; Tue, 6 May 2014 02:06:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933648AbaEFCGt (ORCPT ); Mon, 5 May 2014 22:06:49 -0400 Received: from mail-bn1blp0184.outbound.protection.outlook.com ([207.46.163.184]:46608 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933564AbaEFCGs (ORCPT ); Mon, 5 May 2014 22:06:48 -0400 Received: from CH1PR03CA010.namprd03.prod.outlook.com (10.255.156.155) by BY2PR03MB044.namprd03.prod.outlook.com (10.255.241.148) with Microsoft SMTP Server (TLS) id 15.0.934.12; Tue, 6 May 2014 02:06:44 +0000 Received: from BN1BFFO11FD011.protection.gbl (10.255.156.132) by CH1PR03CA010.outlook.office365.com (10.255.156.155) with Microsoft SMTP Server (TLS) id 15.0.934.12 via Frontend Transport; Tue, 6 May 2014 02:06:43 +0000 Received: from tx30smr01.am.freescale.net (192.88.168.50) by BN1BFFO11FD011.mail.protection.outlook.com (10.58.144.74) with Microsoft SMTP Server (TLS) id 15.0.929.8 via Frontend Transport; Tue, 6 May 2014 02:06:43 +0000 Received: from Robin-OptiPlex-780.ap.freescale.net (Robin-OptiPlex-780.ap.freescale.net [10.192.242.90]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with ESMTP id s4626YWs027705; Mon, 5 May 2014 19:06:35 -0700 From: Robin Gong To: , , CC: , , Subject: [PATCH v3] dma: imx-sdma: add support for sdma memory copy Date: Tue, 6 May 2014 10:12:48 +0800 Message-ID: <1399342368-15217-1-git-send-email-b38343@freescale.com> X-Mailer: git-send-email 1.7.5.4 X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:192.88.168.50; CTRY:US; IPV:NLI; EFV:NLI; SFV:NSPM; SFS:(10009001)(6009001)(199002)(189002)(47776003)(68736004)(19580395003)(92726001)(88136002)(74502001)(31966008)(92566001)(20776003)(99396002)(81542001)(81342001)(79102001)(50986999)(2009001)(36756003)(97736001)(74662001)(2201001)(93916002)(62966002)(50226001)(76482001)(4396001)(77156001)(83322001)(87286001)(21056001)(77982001)(87936001)(46102001)(64706001)(83072002)(33646001)(89996001)(50466002)(80022001)(6806004)(44976005)(48376002)(85852003)(19580405001)(77096999)(84676001)(42262001)(2101003); DIR:OUT; SFP:1101; SCL:1; SRVR:BY2PR03MB044; H:tx30smr01.am.freescale.net; FPR:; MLV:sfv; PTR:InfoDomainNonexistent; A:1; MX:1; LANG:en; MIME-Version: 1.0 X-Forefront-PRVS: 0203C93D51 Received-SPF: Fail (: domain of freescale.com does not designate 192.88.168.50 as permitted sender) receiver=; client-ip=192.88.168.50; helo=tx30smr01.am.freescale.net; Authentication-Results: spf=fail (sender IP is 192.88.168.50) smtp.mailfrom=yibin.gong@freescale.com; X-OriginatorOrg: freescale.com Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP add "device_prep_dma_memcpy" and "device_prep_dma_sg" for memory copy by sdma. Signed-off-by: Robin Gong --- change: --v3: 1. remove redundant check for bus width --v2: 1. correct some printk format, such as %pad for dma_addr_t 2. split duplicated code in prep_dma_memcpy and prep_dma_sg to make code clean. Signed-off-by: Robin Gong --- drivers/dma/imx-sdma.c | 250 ++++++++++++++++++++++++++++++++++++----------- 1 files changed, 191 insertions(+), 59 deletions(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 4e79183..9abc164 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -229,6 +229,7 @@ struct sdma_context_data { } __attribute__ ((packed)); #define NUM_BD (int)(PAGE_SIZE / sizeof(struct sdma_buffer_descriptor)) +#define SDMA_BD_MAX_CNT (0xfffc) /* align with 4 bytes */ struct sdma_engine; @@ -260,6 +261,7 @@ struct sdma_channel { unsigned int pc_from_device, pc_to_device; unsigned long flags; dma_addr_t per_address; + unsigned int pc_to_pc; unsigned long event_mask[2]; unsigned long watermark_level; u32 shp_addr, per_addr; @@ -694,6 +696,7 @@ static void sdma_get_pc(struct sdma_channel *sdmac, sdmac->pc_from_device = 0; sdmac->pc_to_device = 0; + sdmac->pc_to_pc = 0; switch (peripheral_type) { case IMX_DMATYPE_MEMORY: @@ -763,6 +766,7 @@ static void sdma_get_pc(struct sdma_channel *sdmac, sdmac->pc_from_device = per_2_emi; sdmac->pc_to_device = emi_2_per; + sdmac->pc_to_pc = emi_2_emi; } static int sdma_load_context(struct sdma_channel *sdmac) @@ -775,11 +779,12 @@ static int sdma_load_context(struct sdma_channel *sdmac) int ret; unsigned long flags; - if (sdmac->direction == DMA_DEV_TO_MEM) { + if (sdmac->direction == DMA_DEV_TO_MEM) load_address = sdmac->pc_from_device; - } else { + else if (sdmac->direction == DMA_MEM_TO_MEM) + load_address = sdmac->pc_to_pc; + else load_address = sdmac->pc_to_device; - } if (load_address < 0) return load_address; @@ -1010,99 +1015,203 @@ static void sdma_free_chan_resources(struct dma_chan *chan) clk_disable(sdma->clk_ahb); } -static struct dma_async_tx_descriptor *sdma_prep_slave_sg( - struct dma_chan *chan, struct scatterlist *sgl, - unsigned int sg_len, enum dma_transfer_direction direction, - unsigned long flags, void *context) +static int sdma_transfer_init(struct sdma_channel *sdmac, + enum dma_transfer_direction direction) +{ + int ret = 0; + + sdmac->status = DMA_IN_PROGRESS; + sdmac->buf_tail = 0; + sdmac->flags = 0; + sdmac->direction = direction; + + ret = sdma_load_context(sdmac); + if (ret) + return ret; + + sdmac->chn_count = 0; + + return ret; +} + +static int check_bd_buswidth(struct sdma_buffer_descriptor *bd, + struct sdma_channel *sdmac, int count, + dma_addr_t dma_dst, dma_addr_t dma_src) +{ + int ret = 0; + + switch (sdmac->word_size) { + case DMA_SLAVE_BUSWIDTH_4_BYTES: + bd->mode.command = 0; + if ((count | dma_dst | dma_src) & 3) + ret = -EINVAL; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + bd->mode.command = 2; + if ((count | dma_dst | dma_src) & 1) + ret = -EINVAL; + break; + case DMA_SLAVE_BUSWIDTH_1_BYTE: + bd->mode.command = 1; + break; + default: + return -EINVAL; + } + + return ret; +} + +static struct dma_async_tx_descriptor *sdma_prep_memcpy( + struct dma_chan *chan, dma_addr_t dma_dst, + dma_addr_t dma_src, size_t len, unsigned long flags) { struct sdma_channel *sdmac = to_sdma_chan(chan); struct sdma_engine *sdma = sdmac->sdma; - int ret, i, count; int channel = sdmac->channel; - struct scatterlist *sg; + size_t count; + int i = 0, param; + struct sdma_buffer_descriptor *bd; - if (sdmac->status == DMA_IN_PROGRESS) + if (!chan || !len || sdmac->status == DMA_IN_PROGRESS) return NULL; - sdmac->status = DMA_IN_PROGRESS; - sdmac->flags = 0; - - sdmac->buf_tail = 0; + if (len >= NUM_BD * SDMA_BD_MAX_CNT) { + dev_err(sdma->dev, "channel%d: maximum bytes exceeded:%zu > %d\n" + , channel, len, NUM_BD * SDMA_BD_MAX_CNT); + goto err_out; + } - dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n", - sg_len, channel); + dev_dbg(sdma->dev, "memcpy: %pad->%pad, len=%zu, channel=%d.\n", + &dma_src, &dma_dst, len, channel); - sdmac->direction = direction; - ret = sdma_load_context(sdmac); - if (ret) + if (sdma_transfer_init(sdmac, DMA_MEM_TO_MEM)) goto err_out; - if (sg_len > NUM_BD) { + do { + count = min_t(size_t, len, SDMA_BD_MAX_CNT); + bd = &sdmac->bd[i]; + bd->buffer_addr = dma_src; + bd->ext_buffer_addr = dma_dst; + bd->mode.count = count; + + if (check_bd_buswidth(bd, sdmac, count, dma_dst, dma_src)) + goto err_out; + + dma_src += count; + dma_dst += count; + len -= count; + i++; + + param = BD_DONE | BD_EXTD | BD_CONT; + /* last bd */ + if (!len) { + param |= BD_INTR; + param |= BD_LAST; + param &= ~BD_CONT; + } + + dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%u %s%s\n", + i, count, bd->buffer_addr, + param & BD_WRAP ? "wrap" : "", + param & BD_INTR ? " intr" : ""); + + bd->mode.status = param; + sdmac->chn_count += count; + } while (len); + + sdmac->num_bd = i; + sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; + + return &sdmac->desc; +err_out: + sdmac->status = DMA_ERROR; + return NULL; +} + +/* + * Please ensure dst_nents no smaller than src_nents , also every sg_len of + * dst_sg node no smaller than src_sg. To simply things, please use the same + * size of dst_sg as src_sg. + */ +static struct dma_async_tx_descriptor *sdma_prep_sg( + struct dma_chan *chan, + struct scatterlist *dst_sg, unsigned int dst_nents, + struct scatterlist *src_sg, unsigned int src_nents, + enum dma_transfer_direction direction) +{ + struct sdma_channel *sdmac = to_sdma_chan(chan); + struct sdma_engine *sdma = sdmac->sdma; + int ret, i, count; + int channel = sdmac->channel; + struct scatterlist *sg_src = src_sg, *sg_dst = dst_sg; + + if (sdmac->status == DMA_IN_PROGRESS) + return NULL; + + dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n", + src_nents, channel); + + if (src_nents > NUM_BD) { dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n", - channel, sg_len, NUM_BD); - ret = -EINVAL; + channel, src_nents, NUM_BD); goto err_out; } - sdmac->chn_count = 0; - for_each_sg(sgl, sg, sg_len, i) { + if (sdma_transfer_init(sdmac, direction)) + goto err_out; + + for_each_sg(src_sg, sg_src, src_nents, i) { struct sdma_buffer_descriptor *bd = &sdmac->bd[i]; int param; - bd->buffer_addr = sg->dma_address; + bd->buffer_addr = sg_src->dma_address; - count = sg_dma_len(sg); + if (direction == DMA_MEM_TO_MEM) { + BUG_ON(!sg_dst); + bd->ext_buffer_addr = sg_dst->dma_address; + } + + count = sg_dma_len(sg_src); - if (count > 0xffff) { + if (count > SDMA_BD_MAX_CNT) { dev_err(sdma->dev, "SDMA channel %d: maximum bytes for sg entry exceeded: %d > %d\n", - channel, count, 0xffff); - ret = -EINVAL; + channel, count, SDMA_BD_MAX_CNT); goto err_out; } bd->mode.count = count; sdmac->chn_count += count; - if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) { - ret = -EINVAL; - goto err_out; - } + if (direction == DMA_MEM_TO_MEM) + ret = check_bd_buswidth(bd, sdmac, count, + sg_dst->dma_address, + sg_src->dma_address); + else + ret = check_bd_buswidth(bd, sdmac, count, 0, + sg_src->dma_address); - switch (sdmac->word_size) { - case DMA_SLAVE_BUSWIDTH_4_BYTES: - bd->mode.command = 0; - if (count & 3 || sg->dma_address & 3) - return NULL; - break; - case DMA_SLAVE_BUSWIDTH_2_BYTES: - bd->mode.command = 2; - if (count & 1 || sg->dma_address & 1) - return NULL; - break; - case DMA_SLAVE_BUSWIDTH_1_BYTE: - bd->mode.command = 1; - break; - default: - return NULL; - } + if (ret) + goto err_out; param = BD_DONE | BD_EXTD | BD_CONT; - if (i + 1 == sg_len) { + if (i + 1 == src_nents) { param |= BD_INTR; param |= BD_LAST; param &= ~BD_CONT; } - dev_dbg(sdma->dev, "entry %d: count: %d dma: %#llx %s%s\n", - i, count, (u64)sg->dma_address, + dev_dbg(sdma->dev, "entry %d: count: %d dma: %pad %s%s\n", + i, count, &sg_src->dma_address, param & BD_WRAP ? "wrap" : "", param & BD_INTR ? " intr" : ""); bd->mode.status = param; + if (direction == DMA_MEM_TO_MEM) + sg_dst = sg_next(sg_dst); } - sdmac->num_bd = sg_len; + sdmac->num_bd = src_nents; sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; return &sdmac->desc; @@ -1111,6 +1220,24 @@ err_out: return NULL; } +static struct dma_async_tx_descriptor *sdma_prep_memcpy_sg( + struct dma_chan *chan, + struct scatterlist *dst_sg, unsigned int dst_nents, + struct scatterlist *src_sg, unsigned int src_nents, + unsigned long flags) +{ + return sdma_prep_sg(chan, dst_sg, dst_nents, src_sg, src_nents, + DMA_MEM_TO_MEM); +} + +static struct dma_async_tx_descriptor *sdma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + return sdma_prep_sg(chan, NULL, 0, sgl, sg_len, direction); +} + static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic( struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, size_t period_len, enum dma_transfer_direction direction, @@ -1143,9 +1270,9 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic( goto err_out; } - if (period_len > 0xffff) { - dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %d > %d\n", - channel, period_len, 0xffff); + if (period_len > SDMA_BD_MAX_CNT) { + dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %zu > %d\n", + channel, period_len, SDMA_BD_MAX_CNT); goto err_out; } @@ -1168,8 +1295,8 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic( if (i + 1 == num_periods) param |= BD_WRAP; - dev_dbg(sdma->dev, "entry %d: count: %d dma: %#llx %s%s\n", - i, period_len, (u64)dma_addr, + dev_dbg(sdma->dev, "entry %d: count: %d dma: %pad %s%s\n", + i, period_len, &dma_addr, param & BD_WRAP ? "wrap" : "", param & BD_INTR ? " intr" : ""); @@ -1206,6 +1333,8 @@ static int sdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, sdmac->watermark_level = dmaengine_cfg->src_maxburst * dmaengine_cfg->src_addr_width; sdmac->word_size = dmaengine_cfg->src_addr_width; + } else if (dmaengine_cfg->direction == DMA_MEM_TO_MEM) { + sdmac->word_size = dmaengine_cfg->dst_addr_width; } else { sdmac->per_address = dmaengine_cfg->dst_addr; sdmac->watermark_level = dmaengine_cfg->dst_maxburst * @@ -1516,6 +1645,7 @@ static int __init sdma_probe(struct platform_device *pdev) dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask); dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask); + dma_cap_set(DMA_MEMCPY, sdma->dma_device.cap_mask); INIT_LIST_HEAD(&sdma->dma_device.channels); /* Initialize channel parameters */ @@ -1578,6 +1708,8 @@ static int __init sdma_probe(struct platform_device *pdev) sdma->dma_device.device_tx_status = sdma_tx_status; sdma->dma_device.device_prep_slave_sg = sdma_prep_slave_sg; sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic; + sdma->dma_device.device_prep_dma_memcpy = sdma_prep_memcpy; + sdma->dma_device.device_prep_dma_sg = sdma_prep_memcpy_sg; sdma->dma_device.device_control = sdma_control; sdma->dma_device.device_issue_pending = sdma_issue_pending; sdma->dma_device.dev->dma_parms = &sdma->dma_parms;