dmaengine: rcar-audmapp: independent from SH_DMAE_BASE

Message ID	8761ekokpf.wl%kuninori.morimoto.gx@renesas.com (mailing list archive)
State	Not Applicable
Headers	show Return-Path: <dmaengine-owner@kernel.org> Message-ID: <8761ekokpf.wl%kuninori.morimoto.gx@renesas.com> From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> To: <dmaengine@vger.kernel.org> CC: Simon <horms@verge.net.au>, Rob Herring <robh+dt@kernel.org>, Linux-SH <linux-sh@vger.kernel.org>, Laurent <laurent.pinchart@ideasonboard.com>, Grant Likely <grant.likely@linaro.org> Subject: [PATCH] dmaengine: rcar-audmapp: independent from SH_DMAE_BASE User-Agent: Wanderlust/2.14.0 Emacs/23.3 Mule/6.0 MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset="US-ASCII" Date: Wed, 12 Nov 2014 09:02:38 +0000 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk

diff --git a/drivers/dma/sh/Kconfig b/drivers/dma/sh/Kconfig index 8190ad2..41e5c97 100644 --- a/drivers/dma/sh/Kconfig +++ b/drivers/dma/sh/Kconfig @@ -53,7 +53,8 @@ config RCAR_HPB_DMAE config RCAR_AUDMAC_PP tristate "Renesas R-Car Audio DMAC Peripheral Peripheral support" - depends on SH_DMAE_BASE + depends on ARCH_SHMOBILE || COMPILE_TEST + select RENESAS_DMA help Enable support for the Renesas R-Car Audio DMAC Peripheral Peripheral controllers. diff --git a/drivers/dma/sh/rcar-audmapp.c b/drivers/dma/sh/rcar-audmapp.c index d95bbdd..b39e388 100644 --- a/drivers/dma/sh/rcar-audmapp.c +++ b/drivers/dma/sh/rcar-audmapp.c @@ -18,14 +18,10 @@ * */ #include <linux/delay.h> -#include <linux/init.h> #include <linux/module.h> -#include <linux/slab.h> -#include <linux/dmaengine.h> #include <linux/of_dma.h> -#include <linux/platform_data/dma-rcar-audmapp.h> #include <linux/platform_device.h> -#include <linux/shdma-base.h> +#include "../dmaengine.h" /* * DMA register @@ -41,317 +37,286 @@ /* Default MEMCPY transfer size = 2^2 = 4 bytes */ #define LOG2_DEFAULT_XFER_SIZE 2 -#define AUDMAPP_SLAVE_NUMBER 256 -#define AUDMAPP_LEN_MAX (16 * 1024 * 1024) +struct audmapp_priv; struct audmapp_chan { - struct shdma_chan shdma_chan; - void __iomem *base; - dma_addr_t slave_addr; + struct dma_chan chan; + struct dma_async_tx_descriptor async_tx; + + dma_addr_t src; + dma_addr_t dst; u32 chcr; -}; -struct audmapp_device { - struct shdma_dev shdma_dev; - struct audmapp_pdata *pdata; - struct device *dev; - void __iomem *chan_reg; + int id; }; -struct audmapp_desc { - struct shdma_desc shdma_desc; - dma_addr_t src; - dma_addr_t dst; +struct audmapp_priv { + struct dma_device dma; + void __iomem *achan_reg; + + struct audmapp_chan achan[AUDMAPP_MAX_CHANNELS]; }; -#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan) +#define chan_to_achan(chan) container_of(chan, struct audmapp_chan, chan) +#define achan_to_priv(achan) container_of(achan - achan->id, \ + struct audmapp_priv, achan[0]) + +#define priv_to_dev(priv) ((priv)->dma.dev) +#define priv_to_dma(priv) (&(priv)->dma) -#define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan) -#define to_desc(sdesc) container_of(sdesc, struct audmapp_desc, shdma_desc) -#define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device, \ - struct audmapp_device, shdma_dev.dma_dev) +#define audmapp_reg(achan, _reg) (achan_to_priv(achan)->achan_reg + \ + 0x20 + (0x10 * achan->id) + _reg) -static void audmapp_write(struct audmapp_chan *auchan, u32 data, u32 reg) +#define audmapp_for_each_achan(achan, priv, i) \ + for (i = 0; \ + (i < AUDMAPP_MAX_CHANNELS && ((achan) = priv->achan + i)); \ + i++) + +static void audmapp_write(struct audmapp_chan *achan, u32 data, u32 _reg) { - struct audmapp_device *audev = to_dev(auchan); - struct device *dev = audev->dev; + struct audmapp_priv *priv = achan_to_priv(achan); + struct device *dev = priv_to_dev(priv); + void __iomem *reg = audmapp_reg(achan, _reg); - dev_dbg(dev, "w %p : %08x\n", auchan->base + reg, data); + dev_dbg(dev, "w %p : %08x\n", reg, data); - iowrite32(data, auchan->base + reg); + iowrite32(data, reg); } -static u32 audmapp_read(struct audmapp_chan *auchan, u32 reg) +static u32 audmapp_read(struct audmapp_chan *achan, u32 _reg) { - return ioread32(auchan->base + reg); + return ioread32(audmapp_reg(achan, _reg)); } -static void audmapp_halt(struct shdma_chan *schan) +static void audmapp_halt(struct audmapp_chan *achan) { - struct audmapp_chan *auchan = to_chan(schan); int i; - audmapp_write(auchan, 0, PDMACHCR); + audmapp_write(achan, 0, PDMACHCR); for (i = 0; i < 1024; i++) { - if (0 == audmapp_read(auchan, PDMACHCR)) + if (0 == audmapp_read(achan, PDMACHCR)) return; udelay(1); } } -static void audmapp_start_xfer(struct shdma_chan *schan, - struct shdma_desc *sdesc) +static int audmapp_alloc_chan_resources(struct dma_chan *chan) { - struct audmapp_chan *auchan = to_chan(schan); - struct audmapp_device *audev = to_dev(auchan); - struct audmapp_desc *desc = to_desc(sdesc); - struct device *dev = audev->dev; - u32 chcr = auchan->chcr | PDMACHCR_DE; + if (chan->private) + return -ENODEV; - dev_dbg(dev, "src/dst/chcr = %pad/%pad/%08x\n", - &desc->src, &desc->dst, chcr); + chan->private = chan_to_achan(chan); - audmapp_write(auchan, desc->src, PDMASAR); - audmapp_write(auchan, desc->dst, PDMADAR); - audmapp_write(auchan, chcr, PDMACHCR); + return 0; } -static int audmapp_get_config(struct audmapp_chan *auchan, int slave_id, - u32 *chcr, dma_addr_t *dst) +static void audmapp_free_chan_resources(struct dma_chan *chan) { - struct audmapp_device *audev = to_dev(auchan); - struct audmapp_pdata *pdata = audev->pdata; - struct audmapp_slave_config *cfg; - int i; - - *chcr = 0; - *dst = 0; - - if (!pdata) { /* DT */ - *chcr = ((u32)slave_id) << 16; - auchan->shdma_chan.slave_id = (slave_id) >> 8; - return 0; - } - - /* non-DT */ - - if (slave_id >= AUDMAPP_SLAVE_NUMBER) - return -ENXIO; - - for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) - if (cfg->slave_id == slave_id) { - *chcr = cfg->chcr; - *dst = cfg->dst; - return 0; - } - - return -ENXIO; + chan->private = NULL; } -static int audmapp_set_slave(struct shdma_chan *schan, int slave_id, - dma_addr_t slave_addr, bool try) +static struct dma_async_tx_descriptor * +audmapp_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, + size_t buf_len, size_t period_len, + enum dma_transfer_direction dir, unsigned long flags) { - struct audmapp_chan *auchan = to_chan(schan); - u32 chcr; - dma_addr_t dst; - int ret; - - ret = audmapp_get_config(auchan, slave_id, &chcr, &dst); - if (ret < 0) - return ret; - - if (try) - return 0; - - auchan->chcr = chcr; - auchan->slave_addr = slave_addr ? : dst; + struct audmapp_chan *achan = chan_to_achan(chan); - return 0; + return &achan->async_tx; } -static int audmapp_desc_setup(struct shdma_chan *schan, - struct shdma_desc *sdesc, - dma_addr_t src, dma_addr_t dst, size_t *len) +static void audmapp_slave_config(struct audmapp_chan *achan, + struct dma_slave_config *cfg) { - struct audmapp_desc *desc = to_desc(sdesc); - - if (*len > (size_t)AUDMAPP_LEN_MAX) - *len = (size_t)AUDMAPP_LEN_MAX; - - desc->src = src; - desc->dst = dst; - - return 0; + achan->src = cfg->src_addr; + achan->dst = cfg->dst_addr; } -static void audmapp_setup_xfer(struct shdma_chan *schan, - int slave_id) +static int audmapp_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, + unsigned long arg) { + struct audmapp_chan *achan = chan_to_achan(chan); + + switch (cmd) { + case DMA_TERMINATE_ALL: + audmapp_halt(achan); + break; + case DMA_SLAVE_CONFIG: + audmapp_slave_config(achan, (struct dma_slave_config *)arg); + break; + default: + return -ENXIO; + } + + return 0; } -static dma_addr_t audmapp_slave_addr(struct shdma_chan *schan) +static enum dma_status audmapp_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) { - struct audmapp_chan *auchan = to_chan(schan); - - return auchan->slave_addr; + return dma_cookie_status(chan, cookie, txstate); } -static bool audmapp_channel_busy(struct shdma_chan *schan) +static void audmapp_issue_pending(struct dma_chan *chan) { - struct audmapp_chan *auchan = to_chan(schan); - u32 chcr = audmapp_read(auchan, PDMACHCR); + struct audmapp_chan *achan = chan_to_achan(chan); + struct audmapp_priv *priv = achan_to_priv(achan); + struct device *dev = priv_to_dev(priv); + u32 chcr = achan->chcr | PDMACHCR_DE; - return chcr & ~PDMACHCR_DE; -} + dev_dbg(dev, "src/dst/chcr = %pad/%pad/%08x\n", + &achan->src, &achan->dst, chcr); -static bool audmapp_desc_completed(struct shdma_chan *schan, - struct shdma_desc *sdesc) -{ - return true; + audmapp_write(achan, achan->src, PDMASAR); + audmapp_write(achan, achan->dst, PDMADAR); + audmapp_write(achan, chcr, PDMACHCR); } -static struct shdma_desc *audmapp_embedded_desc(void *buf, int i) +static bool audmapp_chan_filter(struct dma_chan *chan, void *arg) { - return &((struct audmapp_desc *)buf)[i].shdma_desc; + struct dma_device *dma = chan->device; + struct of_phandle_args *dma_spec = arg; + + /* + * FIXME: Using a filter on OF platforms is a nonsense. The OF xlate + * function knows from which device it wants to allocate a channel from, + * and would be perfectly capable of selecting the channel it wants. + * Forcing it to call dma_request_channel() and iterate through all + * channels from all controllers is just pointless. + */ + if (dma->device_control != audmapp_control || + dma_spec->np != dma->dev->of_node) + return false; + + /* + * see + * audmapp_alloc_chan_resources() + * audmapp_free_chan_resources() + */ + return !chan->private; } -static const struct shdma_ops audmapp_shdma_ops = { - .halt_channel = audmapp_halt, - .desc_setup = audmapp_desc_setup, - .set_slave = audmapp_set_slave, - .start_xfer = audmapp_start_xfer, - .embedded_desc = audmapp_embedded_desc, - .setup_xfer = audmapp_setup_xfer, - .slave_addr = audmapp_slave_addr, - .channel_busy = audmapp_channel_busy, - .desc_completed = audmapp_desc_completed, -}; - -static int audmapp_chan_probe(struct platform_device *pdev, - struct audmapp_device *audev, int id) +static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) { - struct shdma_dev *sdev = &audev->shdma_dev; - struct audmapp_chan *auchan; - struct shdma_chan *schan; - struct device *dev = audev->dev; + struct audmapp_chan *achan; + struct dma_chan *chan; + dma_cap_mask_t mask; - auchan = devm_kzalloc(dev, sizeof(*auchan), GFP_KERNEL); - if (!auchan) - return -ENOMEM; + if (dma_spec->args_count != 1) + return NULL; - schan = &auchan->shdma_chan; - schan->max_xfer_len = AUDMAPP_LEN_MAX; + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); - shdma_chan_probe(sdev, schan, id); + chan = dma_request_channel(mask, audmapp_chan_filter, dma_spec); + if (!chan) + return NULL; - auchan->base = audev->chan_reg + 0x20 + (0x10 * id); - dev_dbg(dev, "%02d : %p / %p", id, auchan->base, audev->chan_reg); + achan = chan_to_achan(chan); + achan->chcr = dma_spec->args[0] << 16; - return 0; + return chan; } -static void audmapp_chan_remove(struct audmapp_device *audev) +static dma_cookie_t audmapp_tx_submit(struct dma_async_tx_descriptor *tx) { - struct shdma_chan *schan; - int i; - - shdma_for_each_chan(schan, &audev->shdma_dev, i) { - BUG_ON(!schan); - shdma_chan_remove(schan); - } + return dma_cookie_assign(tx); } -static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec, - struct of_dma *ofdma) +static int audmapp_chan_desc_probe(struct platform_device *pdev, + struct audmapp_priv *priv) + { - dma_cap_mask_t mask; + struct dma_device *dma = priv_to_dma(priv); + struct device *dev = priv_to_dev(priv); + struct audmapp_chan *achan; struct dma_chan *chan; - u32 chcr = dma_spec->args[0]; + int i; - if (dma_spec->args_count != 1) - return NULL; + audmapp_for_each_achan(achan, priv, i) { + chan = &achan->chan; - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); + achan->id = i; - chan = dma_request_channel(mask, shdma_chan_filter, NULL); - if (chan) - to_shdma_chan(chan)->hw_req = chcr; + /* + * Initialize the DMA engine channel and add it to the DMA + * engine channels list. + */ + chan->private = NULL; + chan->device = dma; + dma_cookie_init(chan); + list_add_tail(&chan->device_node, &dma->channels); - return chan; + achan->async_tx.tx_submit = audmapp_tx_submit; + dma_async_tx_descriptor_init(&achan->async_tx, chan); + + dev_dbg(dev, "%02d : %p\n", i, audmapp_reg(achan, 0)); + } + + return 0; } static int audmapp_probe(struct platform_device *pdev) { - struct audmapp_pdata *pdata = pdev->dev.platform_data; - struct device_node *np = pdev->dev.of_node; - struct audmapp_device *audev; - struct shdma_dev *sdev; - struct dma_device *dma_dev; + struct device *dev = &pdev->dev; + struct audmapp_priv *priv; + struct dma_device *dma; struct resource *res; - int err, i; + int ret; - if (np) - of_dma_controller_register(np, audmapp_of_xlate, pdev); - else if (!pdata) - return -ENODEV; + of_dma_controller_register(dev->of_node, audmapp_of_xlate, pdev); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - audev = devm_kzalloc(&pdev->dev, sizeof(*audev), GFP_KERNEL); - if (!audev) + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) return -ENOMEM; - audev->dev = &pdev->dev; - audev->pdata = pdata; - audev->chan_reg = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(audev->chan_reg)) - return PTR_ERR(audev->chan_reg); + priv->achan_reg = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->achan_reg)) + return PTR_ERR(priv->achan_reg); - sdev = &audev->shdma_dev; - sdev->ops = &audmapp_shdma_ops; - sdev->desc_size = sizeof(struct audmapp_desc); + dev_dbg(dev, "%llx => %p\n", (u64)res->start, priv->achan_reg); - dma_dev = &sdev->dma_dev; - dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE; - dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); + dma = priv_to_dma(priv); + dma->copy_align = LOG2_DEFAULT_XFER_SIZE; + INIT_LIST_HEAD(&dma->channels); + dma_cap_set(DMA_SLAVE, dma->cap_mask); - err = shdma_init(&pdev->dev, sdev, AUDMAPP_MAX_CHANNELS); - if (err < 0) - return err; + dma->device_alloc_chan_resources = audmapp_alloc_chan_resources; + dma->device_free_chan_resources = audmapp_free_chan_resources; + dma->device_prep_dma_cyclic = audmapp_prep_dma_cyclic; + dma->device_control = audmapp_control; + dma->device_tx_status = audmapp_tx_status; + dma->device_issue_pending = audmapp_issue_pending; + dma->dev = dev; - platform_set_drvdata(pdev, audev); + platform_set_drvdata(pdev, priv); - /* Create DMA Channel */ - for (i = 0; i < AUDMAPP_MAX_CHANNELS; i++) { - err = audmapp_chan_probe(pdev, audev, i); - if (err) - goto chan_probe_err; - } - - err = dma_async_device_register(dma_dev); - if (err < 0) - goto chan_probe_err; + ret = audmapp_chan_desc_probe(pdev, priv); + if (ret) + return ret; - return err; + ret = dma_async_device_register(dma); + if (ret) + return ret; -chan_probe_err: - audmapp_chan_remove(audev); - shdma_cleanup(sdev); + dev_info(dev, "probed\n"); - return err; + return ret; } static int audmapp_remove(struct platform_device *pdev) { - struct audmapp_device *audev = platform_get_drvdata(pdev); - struct dma_device *dma_dev = &audev->shdma_dev.dma_dev; + struct audmapp_priv *priv = platform_get_drvdata(pdev); + struct dma_device *dma = priv_to_dma(priv); - dma_async_device_unregister(dma_dev); + dma_async_device_unregister(dma); - audmapp_chan_remove(audev); - shdma_cleanup(&audev->shdma_dev); + of_dma_controller_free(pdev->dev.of_node); return 0; } diff --git a/include/linux/platform_data/dma-rcar-audmapp.h b/include/linux/platform_data/dma-rcar-audmapp.h deleted file mode 100644 index 471fffe..0000000 --- a/include/linux/platform_data/dma-rcar-audmapp.h +++ /dev/null @@ -1,34 +0,0 @@ -/* - * This is for Renesas R-Car Audio-DMAC-peri-peri. - * - * Copyright (C) 2014 Renesas Electronics Corporation - * Copyright (C) 2014 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> - * - * This file is based on the include/linux/sh_dma.h - * - * Header for the new SH dmaengine driver - * - * Copyright (C) 2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#ifndef SH_AUDMAPP_H -#define SH_AUDMAPP_H - -#include <linux/dmaengine.h> - -struct audmapp_slave_config { - int slave_id; - dma_addr_t src; - dma_addr_t dst; - u32 chcr; -}; - -struct audmapp_pdata { - struct audmapp_slave_config *slave; - int slave_num; -}; - -#endif /* SH_AUDMAPP_H */

dmaengine: rcar-audmapp: independent from SH_DMAE_BASE

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