From patchwork Tue Aug 21 09:30:09 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Masahiro Yamada X-Patchwork-Id: 144693 Delivered-To: patch@linaro.org Received: by 2002:a2e:9754:0:0:0:0:0 with SMTP id f20-v6csp5043630ljj; Tue, 21 Aug 2018 02:41:17 -0700 (PDT) X-Google-Smtp-Source: AA+uWPx5qqTdyItqZsaL0saR7MTPSAYTHAK3+OpAmYT1a7RTdjhvial6QgmNGMxKjKn6hejHnWS4 X-Received: by 2002:a17:902:5501:: with SMTP id f1-v6mr48859535pli.219.1534844477066; Tue, 21 Aug 2018 02:41:17 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1534844477; cv=none; d=google.com; s=arc-20160816; b=vE6iUUvMpV5JND2OGSCnAI6UgozzMoCD29sIwPncTpgSlsMWEp6EUCBhJJC4VOX7XE h8crVMJ7xGCpdSaZJ4zC5p1+PFZEQA1F0xaHCEzre23UwGKVNcSyyM6KRcD6zg6Zf2K0 ELINkgZHloOtPQsIys06mkr3onN6O1RPRcpwawrAhZSmAzEWLHcZJfvNnP6XZcqy3QVO 4z2oE0bld7n4S5kV42XTcrsvZarrtyXuMgIZ+LXJ41pkIIfKUylpK5CMJMofWg4T8wQp Z3esW8QDXl/dVPzDF4MTVwE/TuvIQENKc+123IndIi6CP1YOIO5v6HxcklvxCJw7M/DX poUQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:dkim-filter :arc-authentication-results; bh=W2Jow1+Q+hk7eJlcQMnoWQV9yFCBnCyhuqc89XL/X6s=; b=eN+0eSbbShCq5Bx+Khe7DuSHsXaJaqoU09TRxsoHJNX8znA8le761kDgOC4JrFVIM1 zcyDayK/3QEiiJ5xfbZT3A6Q3oDLtvkxJjSoDmKE+xCDp1DJ0AVNoKzOiIr19W3Vi+hZ e+xVnv1ZuuZBnHnrs3bukLjvHxPuGrFjl4wzwKtOzH7k5auEaaUmjHoxNops5DhpEPmL 0nSWZV4xZK4a03CZ/bMCSnlKHM/AdfrtTh3kNqAjPOLqUXWu8St6u3sMxV2Q+UR3XR2a ojHMvAneLmHbvHKz2jqT4gi58fih0cVGKoIV8mtfVhdc1LROc9N/LiWHOEA2bUQX429H 0Z9Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@nifty.com header.s=dec2015msa header.b=bBUPkLKa; spf=pass (google.com: best guess record for domain of dmaengine-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=dmaengine-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id p61-v6si12440556plb.55.2018.08.21.02.41.16; Tue, 21 Aug 2018 02:41:17 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of dmaengine-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@nifty.com header.s=dec2015msa header.b=bBUPkLKa; spf=pass (google.com: best guess record for domain of dmaengine-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=dmaengine-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726830AbeHUNAl (ORCPT + 3 others); Tue, 21 Aug 2018 09:00:41 -0400 Received: from condef-08.nifty.com ([202.248.20.73]:27850 "EHLO condef-08.nifty.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726797AbeHUNAl (ORCPT ); Tue, 21 Aug 2018 09:00:41 -0400 X-Greylist: delayed 469 seconds by postgrey-1.27 at vger.kernel.org; Tue, 21 Aug 2018 09:00:37 EDT Received: from conuserg-12.nifty.com ([10.126.8.75])by condef-08.nifty.com with ESMTP id w7L9V8HJ027748 for ; Tue, 21 Aug 2018 18:31:10 +0900 Received: from pug.e01.socionext.com (p14092-ipngnfx01kyoto.kyoto.ocn.ne.jp [153.142.97.92]) (authenticated) by conuserg-12.nifty.com with ESMTP id w7L9UZgJ008444; Tue, 21 Aug 2018 18:30:37 +0900 DKIM-Filter: OpenDKIM Filter v2.10.3 conuserg-12.nifty.com w7L9UZgJ008444 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.com; s=dec2015msa; t=1534843837; bh=W2Jow1+Q+hk7eJlcQMnoWQV9yFCBnCyhuqc89XL/X6s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bBUPkLKaUcbFZ7hgB0p4EClb5X8iZGK8AXM0spGXCQscxzN3r/cTXztbqnToPL/98 PmHvBwVgmaXHytC444YEhj0L903muEAfMj/Rjw75/E4ptQOX1ekqttwkD1GJ+xd7u8 GSWUvJ8JWlXa5L07GdTtYMd/3aOcc877uWXrW+AIfKJ3cv14K6A+6+hqZHwR9SWRtT jlkNLsd0gopadvpmXtsOQ4KuavAnBEgha3F3zxrDqXPKya5Eq2qAnp0csxlFV6yX/j 7avekgGmxkiBx2xirhTp914fVULNlKg7QYjkW8JxMLWr9NWLwTTtSOqZ2uCWzgpc7I Cqxww02dwQRSQ== X-Nifty-SrcIP: [153.142.97.92] From: Masahiro Yamada To: Vinod Koul , dmaengine@vger.kernel.org Cc: Masami Hiramatsu , Jassi Brar , Masahiro Yamada Subject: [PATCH 2/2] dmaengine: uniphier-mdmac: add UniPhier MIO DMAC driver Date: Tue, 21 Aug 2018 18:30:09 +0900 Message-Id: <1534843809-4137-3-git-send-email-yamada.masahiro@socionext.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1534843809-4137-1-git-send-email-yamada.masahiro@socionext.com> References: <1534843809-4137-1-git-send-email-yamada.masahiro@socionext.com> Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org The MIO DMAC (Media IO DMA Controller) is used in UniPhier LD4, Pro4, and sLD8 SoCs. Signed-off-by: Masahiro Yamada --- MAINTAINERS | 1 + drivers/dma/Kconfig | 11 + drivers/dma/Makefile | 1 + drivers/dma/uniphier-mdmac.c | 484 +++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 497 insertions(+) create mode 100644 drivers/dma/uniphier-mdmac.c -- 2.7.4 diff --git a/MAINTAINERS b/MAINTAINERS index 8838bf1..c15a024 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2171,6 +2171,7 @@ F: arch/arm/mm/cache-uniphier.c F: arch/arm64/boot/dts/socionext/uniphier* F: drivers/bus/uniphier-system-bus.c F: drivers/clk/uniphier/ +F: drivers/dmaengine/uniphier-mdmac.c F: drivers/gpio/gpio-uniphier.c F: drivers/i2c/busses/i2c-uniphier* F: drivers/irqchip/irq-uniphier-aidet.c diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index dacf3f4..8b8c7f0 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -576,6 +576,17 @@ config TIMB_DMA help Enable support for the Timberdale FPGA DMA engine. +config UNIPHIER_MDMAC + tristate "UniPhier MIO DMAC" + depends on ARCH_UNIPHIER || COMPILE_TEST + depends on OF + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Enable support for the MIO DMAC (Media I/O DMA controller) on the + UniPhier platform. This DMA controller is used as the external + DMA engine of the SD/eMMC controllers of the LD4, Pro4, sLD8 SoCs. + config XGENE_DMA tristate "APM X-Gene DMA support" depends on ARCH_XGENE || COMPILE_TEST diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index c91702d..973a170 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -69,6 +69,7 @@ obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o obj-$(CONFIG_TEGRA210_ADMA) += tegra210-adma.o obj-$(CONFIG_TIMB_DMA) += timb_dma.o +obj-$(CONFIG_UNIPHIER_MDMAC) += uniphier-mdmac.o obj-$(CONFIG_XGENE_DMA) += xgene-dma.o obj-$(CONFIG_ZX_DMA) += zx_dma.o obj-$(CONFIG_ST_FDMA) += st_fdma.o diff --git a/drivers/dma/uniphier-mdmac.c b/drivers/dma/uniphier-mdmac.c new file mode 100644 index 0000000..d558851 --- /dev/null +++ b/drivers/dma/uniphier-mdmac.c @@ -0,0 +1,484 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (C) 2018 Socionext Inc. +// Author: Masahiro Yamada + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "virt-dma.h" + +/* registers common for all channels */ +#define UNIPHIER_MDMAC_CMD 0x000 // issue DMA start/abort +#define UNIPHIER_MDMAC_CMD_ABORT BIT(31) // 1: abort, 0: start + +/* per-channel registers */ +#define UNIPHIER_MDMAC_CH_OFFSET 0x100 +#define UNIPHIER_MDMAC_CH_STRIDE 0x040 + +#define UNIPHIER_MDMAC_CH_IRQ_STAT 0x010 // current hw status (RO) +#define UNIPHIER_MDMAC_CH_IRQ_REQ 0x014 // latched STAT (WOC) +#define UNIPHIER_MDMAC_CH_IRQ_EN 0x018 // IRQ enable mask +#define UNIPHIER_MDMAC_CH_IRQ_DET 0x01c // REQ & EN (RO) +#define UNIPHIER_MDMAC_CH_IRQ__ABORT BIT(13) +#define UNIPHIER_MDMAC_CH_IRQ__DONE BIT(1) +#define UNIPHIER_MDMAC_CH_SRC_MODE 0x020 // mode of source +#define UNIPHIER_MDMAC_CH_DEST_MODE 0x024 // mode of destination +#define UNIPHIER_MDMAC_CH_MODE__ADDR_INC (0 << 4) +#define UNIPHIER_MDMAC_CH_MODE__ADDR_DEC (1 << 4) +#define UNIPHIER_MDMAC_CH_MODE__ADDR_FIXED (2 << 4) +#define UNIPHIER_MDMAC_CH_SRC_ADDR 0x028 // source address +#define UNIPHIER_MDMAC_CH_DEST_ADDR 0x02c // destination address +#define UNIPHIER_MDMAC_CH_SIZE 0x030 // transfer bytes + +struct uniphier_mdmac_desc { + struct virt_dma_desc vd; + struct scatterlist *sgl; + unsigned int sg_len; + unsigned int sg_cur; + enum dma_transfer_direction dir; +}; + +struct uniphier_mdmac_chan { + struct virt_dma_chan vc; + struct uniphier_mdmac_device *mdev; + struct uniphier_mdmac_desc *md; + void __iomem *reg_ch_base; + unsigned int chan_id; +}; + +struct uniphier_mdmac_device { + struct dma_device ddev; + struct clk *clk; + void __iomem *reg_base; + struct uniphier_mdmac_chan channels[0]; +}; + +static struct uniphier_mdmac_chan *to_uniphier_mdmac_chan( + struct virt_dma_chan *vc) +{ + return container_of(vc, struct uniphier_mdmac_chan, vc); +} + +static struct uniphier_mdmac_desc *to_uniphier_mdmac_desc( + struct virt_dma_desc *vd) +{ + return container_of(vd, struct uniphier_mdmac_desc, vd); +} + +/* mc->vc.lock must be held by caller */ +static struct uniphier_mdmac_desc *__uniphier_mdmac_next_desc( + struct uniphier_mdmac_chan *mc) +{ + struct virt_dma_desc *vd; + + vd = vchan_next_desc(&mc->vc); + if (!vd) { + mc->md = NULL; + return NULL; + } + + list_del(&vd->node); + + mc->md = to_uniphier_mdmac_desc(vd); + + return mc->md; +} + +/* mc->vc.lock must be held by caller */ +static void __uniphier_mdmac_handle(struct uniphier_mdmac_chan *mc, + struct uniphier_mdmac_desc *md) +{ + struct uniphier_mdmac_device *mdev = mc->mdev; + struct scatterlist *sg; + u32 irq_flag = UNIPHIER_MDMAC_CH_IRQ__DONE; + u32 src_mode, src_addr, dest_mode, dest_addr, chunk_size; + + sg = &md->sgl[md->sg_cur]; + + if (md->dir == DMA_MEM_TO_DEV) { + src_mode = UNIPHIER_MDMAC_CH_MODE__ADDR_INC; + src_addr = sg_dma_address(sg); + dest_mode = UNIPHIER_MDMAC_CH_MODE__ADDR_FIXED; + dest_addr = 0; + } else { + src_mode = UNIPHIER_MDMAC_CH_MODE__ADDR_FIXED; + src_addr = 0; + dest_mode = UNIPHIER_MDMAC_CH_MODE__ADDR_INC; + dest_addr = sg_dma_address(sg); + } + + chunk_size = sg_dma_len(sg); + + writel(src_mode, mc->reg_ch_base + UNIPHIER_MDMAC_CH_SRC_MODE); + writel(dest_mode, mc->reg_ch_base + UNIPHIER_MDMAC_CH_DEST_MODE); + writel(src_addr, mc->reg_ch_base + UNIPHIER_MDMAC_CH_SRC_ADDR); + writel(dest_addr, mc->reg_ch_base + UNIPHIER_MDMAC_CH_DEST_ADDR); + writel(chunk_size, mc->reg_ch_base + UNIPHIER_MDMAC_CH_SIZE); + + /* write 1 to clear */ + writel(irq_flag, mc->reg_ch_base + UNIPHIER_MDMAC_CH_IRQ_REQ); + + writel(irq_flag, mc->reg_ch_base + UNIPHIER_MDMAC_CH_IRQ_EN); + + writel(BIT(mc->chan_id), mdev->reg_base + UNIPHIER_MDMAC_CMD); +} + +/* mc->vc.lock must be held by caller */ +static void __uniphier_mdmac_start(struct uniphier_mdmac_chan *mc) +{ + struct uniphier_mdmac_desc *md; + + md = __uniphier_mdmac_next_desc(mc); + if (md) + __uniphier_mdmac_handle(mc, md); +} + +/* mc->vc.lock must be held by caller */ +static int __uniphier_mdmac_abort(struct uniphier_mdmac_chan *mc) +{ + struct uniphier_mdmac_device *mdev = mc->mdev; + u32 irq_flag = UNIPHIER_MDMAC_CH_IRQ__ABORT; + u32 val; + + /* write 1 to clear */ + writel(irq_flag, mc->reg_ch_base + UNIPHIER_MDMAC_CH_IRQ_REQ); + + writel(UNIPHIER_MDMAC_CMD_ABORT | BIT(mc->chan_id), + mdev->reg_base + UNIPHIER_MDMAC_CMD); + + /* + * Abort should be accepted soon. We poll the bit here instead of + * waiting for the interrupt. + */ + return readl_poll_timeout(mc->reg_ch_base + UNIPHIER_MDMAC_CH_IRQ_REQ, + val, val & irq_flag, 0, 20); +} + +/* mc->vc.lock must be held by caller */ +static u32 __uniphier_mdmac_get_residue(struct uniphier_mdmac_desc *md) +{ + u32 residue = 0; + int i; + + for (i = md->sg_cur; i < md->sg_len; i++) + residue += sg_dma_len(&md->sgl[i]); + + return residue; +} + +static irqreturn_t uniphier_mdmac_interrupt(int irq, void *dev_id) +{ + struct uniphier_mdmac_chan *mc = dev_id; + struct uniphier_mdmac_desc *md; + irqreturn_t ret = IRQ_HANDLED; + u32 irq_stat; + + spin_lock(&mc->vc.lock); + + irq_stat = readl(mc->reg_ch_base + UNIPHIER_MDMAC_CH_IRQ_DET); + + /* + * Some channels share a single interrupt line. If the IRQ status is 0, + * this is probably triggered by a different channel. + */ + if (!irq_stat) { + ret = IRQ_NONE; + goto out; + } + + /* write 1 to clear */ + writel(irq_stat, mc->reg_ch_base + UNIPHIER_MDMAC_CH_IRQ_REQ); + + /* + * UNIPHIER_MDMAC_CH_IRQ__DONE interrupt is asserted even when the DMA + * is aborted. To distinguish the normal completion and the abort, + * check mc->md. If it is NULL, we are aborting. + */ + md = mc->md; + if (!md) + goto out; + + md->sg_cur++; + + if (md->sg_cur >= md->sg_len) { + vchan_cookie_complete(&md->vd); + md = __uniphier_mdmac_next_desc(mc); + if (!md) + goto out; + } + + __uniphier_mdmac_handle(mc, md); + +out: + spin_unlock(&mc->vc.lock); + + return ret; +} + +static struct dma_async_tx_descriptor *uniphier_mdmac_prep_slave_sg( + struct dma_chan *chan, + struct scatterlist *sgl, + unsigned int sg_len, + enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct virt_dma_chan *vc = to_virt_chan(chan); + struct uniphier_mdmac_desc *md; + + if (!is_slave_direction(direction)) + return NULL; + + md = kzalloc(sizeof(*md), GFP_KERNEL); + if (!md) + return NULL; + + md->sgl = sgl; + md->sg_len = sg_len; + md->dir = direction; + + return vchan_tx_prep(vc, &md->vd, flags); +} + +static int uniphier_mdmac_terminate_all(struct dma_chan *chan) +{ + struct virt_dma_chan *vc = to_virt_chan(chan); + struct uniphier_mdmac_chan *mc = to_uniphier_mdmac_chan(vc); + unsigned long flags; + int ret = 0; + LIST_HEAD(head); + + spin_lock_irqsave(&vc->lock, flags); + + if (mc->md) { + vchan_terminate_vdesc(&mc->md->vd); + mc->md = NULL; + ret = __uniphier_mdmac_abort(mc); + } + vchan_get_all_descriptors(vc, &head); + + spin_unlock_irqrestore(&vc->lock, flags); + + vchan_dma_desc_free_list(vc, &head); + + return ret; +} + +static void uniphier_mdmac_synchronize(struct dma_chan *chan) +{ + vchan_synchronize(to_virt_chan(chan)); +} + +static enum dma_status uniphier_mdmac_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct virt_dma_chan *vc; + struct virt_dma_desc *vd; + struct uniphier_mdmac_chan *mc; + struct uniphier_mdmac_desc *md = NULL; + enum dma_status stat; + unsigned long flags; + + stat = dma_cookie_status(chan, cookie, txstate); + if (stat == DMA_COMPLETE) + return stat; + + vc = to_virt_chan(chan); + + spin_lock_irqsave(&vc->lock, flags); + + mc = to_uniphier_mdmac_chan(vc); + + if (mc->md && mc->md->vd.tx.cookie == cookie) + md = mc->md; + + if (!md) { + vd = vchan_find_desc(vc, cookie); + if (vd) + md = to_uniphier_mdmac_desc(vd); + } + + if (md) + txstate->residue = __uniphier_mdmac_get_residue(md); + + spin_unlock_irqrestore(&vc->lock, flags); + + return stat; +} + +static void uniphier_mdmac_issue_pending(struct dma_chan *chan) +{ + struct virt_dma_chan *vc = to_virt_chan(chan); + struct uniphier_mdmac_chan *mc = to_uniphier_mdmac_chan(vc); + unsigned long flags; + + spin_lock_irqsave(&vc->lock, flags); + + if (vchan_issue_pending(vc) && !mc->md) + __uniphier_mdmac_start(mc); + + spin_unlock_irqrestore(&vc->lock, flags); +} + +static void uniphier_mdmac_desc_free(struct virt_dma_desc *vd) +{ + kfree(to_uniphier_mdmac_desc(vd)); +} + +static int uniphier_mdmac_chan_init(struct platform_device *pdev, + struct uniphier_mdmac_device *mdev, + int chan_id) +{ + struct device *dev = &pdev->dev; + struct uniphier_mdmac_chan *mc = &mdev->channels[chan_id]; + char *irq_name; + int irq, ret; + + irq = platform_get_irq(pdev, chan_id); + if (irq < 0) { + dev_err(&pdev->dev, "failed to get IRQ number for ch%d\n", + chan_id); + return irq; + } + + irq_name = devm_kasprintf(dev, GFP_KERNEL, "uniphier-mio-dmac-ch%d", + chan_id); + if (!irq_name) + return -ENOMEM; + + ret = devm_request_irq(dev, irq, uniphier_mdmac_interrupt, + IRQF_SHARED, irq_name, mc); + if (ret) + return ret; + + mc->mdev = mdev; + mc->reg_ch_base = mdev->reg_base + UNIPHIER_MDMAC_CH_OFFSET + + UNIPHIER_MDMAC_CH_STRIDE * chan_id; + mc->chan_id = chan_id; + mc->vc.desc_free = uniphier_mdmac_desc_free; + vchan_init(&mc->vc, &mdev->ddev); + + return 0; +} + +static int uniphier_mdmac_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct uniphier_mdmac_device *mdev; + struct dma_device *ddev; + struct resource *res; + u32 nr_chans; + int ret, i; + + ret = of_property_read_u32(dev->of_node, "dma-channels", &nr_chans); + if (ret) { + dev_err(dev, "failed to read dma-channels property\n"); + return ret; + } + + ret = dma_set_mask(dev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + mdev = devm_kzalloc(dev, struct_size(mdev, channels, nr_chans), + GFP_KERNEL); + if (!mdev) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mdev->reg_base = devm_ioremap_resource(dev, res); + if (IS_ERR(mdev->reg_base)) + return PTR_ERR(mdev->reg_base); + + mdev->clk = devm_clk_get(dev, NULL); + if (IS_ERR(mdev->clk)) { + dev_err(dev, "failed to get clock\n"); + return PTR_ERR(mdev->clk); + } + + ret = clk_prepare_enable(mdev->clk); + if (ret) + return ret; + + ddev = &mdev->ddev; + ddev->dev = dev; + dma_cap_set(DMA_PRIVATE, ddev->cap_mask); + ddev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED); + ddev->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED); + ddev->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM); + ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; + ddev->device_prep_slave_sg = uniphier_mdmac_prep_slave_sg; + ddev->device_terminate_all = uniphier_mdmac_terminate_all; + ddev->device_synchronize = uniphier_mdmac_synchronize; + ddev->device_tx_status = uniphier_mdmac_tx_status; + ddev->device_issue_pending = uniphier_mdmac_issue_pending; + INIT_LIST_HEAD(&ddev->channels); + + for (i = 0; i < nr_chans; i++) { + ret = uniphier_mdmac_chan_init(pdev, mdev, i); + if (ret) + goto disable_clk; + } + + ret = dma_async_device_register(ddev); + if (ret) + goto disable_clk; + + ret = of_dma_controller_register(dev->of_node, of_dma_xlate_by_chan_id, + ddev); + if (ret) + goto unregister_dmac; + + platform_set_drvdata(pdev, mdev); + + return 0; + +unregister_dmac: + dma_async_device_unregister(ddev); +disable_clk: + clk_disable_unprepare(mdev->clk); + + return ret; +} + +static int uniphier_mdmac_remove(struct platform_device *pdev) +{ + struct uniphier_mdmac_device *mdev = platform_get_drvdata(pdev); + + of_dma_controller_free(pdev->dev.of_node); + dma_async_device_unregister(&mdev->ddev); + clk_disable_unprepare(mdev->clk); + + return 0; +} + +static const struct of_device_id uniphier_mdmac_match[] = { + { .compatible = "socionext,uniphier-mio-dmac" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, uniphier_mdmac_match); + +static struct platform_driver uniphier_mdmac_driver = { + .probe = uniphier_mdmac_probe, + .remove = uniphier_mdmac_remove, + .driver = { + .name = "uniphier-mio-dmac", + .of_match_table = uniphier_mdmac_match, + }, +}; +module_platform_driver(uniphier_mdmac_driver); + +MODULE_AUTHOR("Masahiro Yamada "); +MODULE_DESCRIPTION("UniPhier MIO DMAC driver"); +MODULE_LICENSE("GPL v2");