| From 4a005a3a4332c487525abd14a3df9634b4bd55bd Mon Sep 17 00:00:00 2001 |
| From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> |
| Date: Mon, 10 Mar 2014 18:11:50 -0700 |
| Subject: shdma: add R-Car Audio DMAC peri peri driver |
| |
| Add support Audio DMAC peri peri driver |
| for Renesas R-Car Gen2 SoC, using 'shdma-base' |
| DMA driver framework. |
| |
| Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> |
| [fixed checkpatch error] |
| Signed-off-by: Vinod Koul <vinod.koul@intel.com> |
| |
| (cherry picked from commit e43a34e3ec5d1b14a11c3220f5a12aa797d73cd1) |
| Signed-off-by: Simon Horman <horms+renesas@verge.net.au> |
| --- |
| drivers/dma/sh/Kconfig | 6 + |
| drivers/dma/sh/Makefile | 1 + |
| drivers/dma/sh/rcar-audmapp.c | 320 +++++++++++++++++++++++++ |
| include/linux/platform_data/dma-rcar-audmapp.h | 34 +++ |
| 4 files changed, 361 insertions(+) |
| create mode 100644 drivers/dma/sh/rcar-audmapp.c |
| create mode 100644 include/linux/platform_data/dma-rcar-audmapp.h |
| |
| diff --git a/drivers/dma/sh/Kconfig b/drivers/dma/sh/Kconfig |
| index dadd9e010c0b..b4c813831006 100644 |
| --- a/drivers/dma/sh/Kconfig |
| +++ b/drivers/dma/sh/Kconfig |
| @@ -29,6 +29,12 @@ config RCAR_HPB_DMAE |
| help |
| Enable support for the Renesas R-Car series DMA controllers. |
| |
| +config RCAR_AUDMAC_PP |
| + tristate "Renesas R-Car Audio DMAC Peripheral Peripheral support" |
| + depends on SH_DMAE_BASE |
| + help |
| + Enable support for the Renesas R-Car Audio DMAC Peripheral Peripheral controllers. |
| + |
| config SHDMA_R8A73A4 |
| def_bool y |
| depends on ARCH_R8A73A4 && SH_DMAE != n |
| diff --git a/drivers/dma/sh/Makefile b/drivers/dma/sh/Makefile |
| index e856af23b789..1ce88b28cfc6 100644 |
| --- a/drivers/dma/sh/Makefile |
| +++ b/drivers/dma/sh/Makefile |
| @@ -7,3 +7,4 @@ endif |
| shdma-objs := $(shdma-y) |
| obj-$(CONFIG_SUDMAC) += sudmac.o |
| obj-$(CONFIG_RCAR_HPB_DMAE) += rcar-hpbdma.o |
| +obj-$(CONFIG_RCAR_AUDMAC_PP) += rcar-audmapp.o |
| diff --git a/drivers/dma/sh/rcar-audmapp.c b/drivers/dma/sh/rcar-audmapp.c |
| new file mode 100644 |
| index 000000000000..2de77289a2e9 |
| --- /dev/null |
| +++ b/drivers/dma/sh/rcar-audmapp.c |
| @@ -0,0 +1,320 @@ |
| +/* |
| + * 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> |
| + * |
| + * based on the drivers/dma/sh/shdma.c |
| + * |
| + * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de> |
| + * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> |
| + * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. |
| + * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. |
| + * |
| + * This is free software; you can redistribute it and/or modify |
| + * it under the terms of the GNU General Public License as published by |
| + * the Free Software Foundation; either version 2 of the License, or |
| + * (at your option) any later version. |
| + * |
| + */ |
| +#include <linux/delay.h> |
| +#include <linux/init.h> |
| +#include <linux/module.h> |
| +#include <linux/slab.h> |
| +#include <linux/dmaengine.h> |
| +#include <linux/platform_data/dma-rcar-audmapp.h> |
| +#include <linux/platform_device.h> |
| +#include <linux/shdma-base.h> |
| + |
| +/* |
| + * DMA register |
| + */ |
| +#define PDMASAR 0x00 |
| +#define PDMADAR 0x04 |
| +#define PDMACHCR 0x0c |
| + |
| +/* PDMACHCR */ |
| +#define PDMACHCR_DE (1 << 0) |
| + |
| +#define AUDMAPP_MAX_CHANNELS 29 |
| + |
| +/* 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_chan { |
| + struct shdma_chan shdma_chan; |
| + struct audmapp_slave_config *config; |
| + void __iomem *base; |
| +}; |
| + |
| +struct audmapp_device { |
| + struct shdma_dev shdma_dev; |
| + struct audmapp_pdata *pdata; |
| + struct device *dev; |
| + void __iomem *chan_reg; |
| +}; |
| + |
| +#define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan) |
| +#define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device, \ |
| + struct audmapp_device, shdma_dev.dma_dev) |
| + |
| +static void audmapp_write(struct audmapp_chan *auchan, u32 data, u32 reg) |
| +{ |
| + struct audmapp_device *audev = to_dev(auchan); |
| + struct device *dev = audev->dev; |
| + |
| + dev_dbg(dev, "w %p : %08x\n", auchan->base + reg, data); |
| + |
| + iowrite32(data, auchan->base + reg); |
| +} |
| + |
| +static u32 audmapp_read(struct audmapp_chan *auchan, u32 reg) |
| +{ |
| + return ioread32(auchan->base + reg); |
| +} |
| + |
| +static void audmapp_halt(struct shdma_chan *schan) |
| +{ |
| + struct audmapp_chan *auchan = to_chan(schan); |
| + int i; |
| + |
| + audmapp_write(auchan, 0, PDMACHCR); |
| + |
| + for (i = 0; i < 1024; i++) { |
| + if (0 == audmapp_read(auchan, PDMACHCR)) |
| + return; |
| + udelay(1); |
| + } |
| +} |
| + |
| +static void audmapp_start_xfer(struct shdma_chan *schan, |
| + struct shdma_desc *sdecs) |
| +{ |
| + struct audmapp_chan *auchan = to_chan(schan); |
| + struct audmapp_device *audev = to_dev(auchan); |
| + struct audmapp_slave_config *cfg = auchan->config; |
| + struct device *dev = audev->dev; |
| + u32 chcr = cfg->chcr | PDMACHCR_DE; |
| + |
| + dev_dbg(dev, "src/dst/chcr = %pad/%pad/%x\n", |
| + &cfg->src, &cfg->dst, cfg->chcr); |
| + |
| + audmapp_write(auchan, cfg->src, PDMASAR); |
| + audmapp_write(auchan, cfg->dst, PDMADAR); |
| + audmapp_write(auchan, chcr, PDMACHCR); |
| +} |
| + |
| +static struct audmapp_slave_config * |
| +audmapp_find_slave(struct audmapp_chan *auchan, int slave_id) |
| +{ |
| + struct audmapp_device *audev = to_dev(auchan); |
| + struct audmapp_pdata *pdata = audev->pdata; |
| + struct audmapp_slave_config *cfg; |
| + int i; |
| + |
| + if (slave_id >= AUDMAPP_SLAVE_NUMBER) |
| + return NULL; |
| + |
| + for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) |
| + if (cfg->slave_id == slave_id) |
| + return cfg; |
| + |
| + return NULL; |
| +} |
| + |
| +static int audmapp_set_slave(struct shdma_chan *schan, int slave_id, |
| + dma_addr_t slave_addr, bool try) |
| +{ |
| + struct audmapp_chan *auchan = to_chan(schan); |
| + struct audmapp_slave_config *cfg = |
| + audmapp_find_slave(auchan, slave_id); |
| + |
| + if (!cfg) |
| + return -ENODEV; |
| + if (try) |
| + return 0; |
| + |
| + auchan->config = cfg; |
| + |
| + return 0; |
| +} |
| + |
| +static int audmapp_desc_setup(struct shdma_chan *schan, |
| + struct shdma_desc *sdecs, |
| + dma_addr_t src, dma_addr_t dst, size_t *len) |
| +{ |
| + struct audmapp_chan *auchan = to_chan(schan); |
| + struct audmapp_slave_config *cfg = auchan->config; |
| + |
| + if (!cfg) |
| + return -ENODEV; |
| + |
| + if (*len > (size_t)AUDMAPP_LEN_MAX) |
| + *len = (size_t)AUDMAPP_LEN_MAX; |
| + |
| + return 0; |
| +} |
| + |
| +static void audmapp_setup_xfer(struct shdma_chan *schan, |
| + int slave_id) |
| +{ |
| +} |
| + |
| +static dma_addr_t audmapp_slave_addr(struct shdma_chan *schan) |
| +{ |
| + return 0; /* always fixed address */ |
| +} |
| + |
| +static bool audmapp_channel_busy(struct shdma_chan *schan) |
| +{ |
| + struct audmapp_chan *auchan = to_chan(schan); |
| + u32 chcr = audmapp_read(auchan, PDMACHCR); |
| + |
| + return chcr & ~PDMACHCR_DE; |
| +} |
| + |
| +static bool audmapp_desc_completed(struct shdma_chan *schan, |
| + struct shdma_desc *sdesc) |
| +{ |
| + return true; |
| +} |
| + |
| +static struct shdma_desc *audmapp_embedded_desc(void *buf, int i) |
| +{ |
| + return &((struct shdma_desc *)buf)[i]; |
| +} |
| + |
| +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) |
| +{ |
| + struct shdma_dev *sdev = &audev->shdma_dev; |
| + struct audmapp_chan *auchan; |
| + struct shdma_chan *schan; |
| + struct device *dev = audev->dev; |
| + |
| + auchan = devm_kzalloc(dev, sizeof(*auchan), GFP_KERNEL); |
| + if (!auchan) |
| + return -ENOMEM; |
| + |
| + schan = &auchan->shdma_chan; |
| + schan->max_xfer_len = AUDMAPP_LEN_MAX; |
| + |
| + shdma_chan_probe(sdev, schan, id); |
| + |
| + auchan->base = audev->chan_reg + 0x20 + (0x10 * id); |
| + dev_dbg(dev, "%02d : %p / %p", id, auchan->base, audev->chan_reg); |
| + |
| + return 0; |
| +} |
| + |
| +static void audmapp_chan_remove(struct audmapp_device *audev) |
| +{ |
| + struct dma_device *dma_dev = &audev->shdma_dev.dma_dev; |
| + struct shdma_chan *schan; |
| + int i; |
| + |
| + shdma_for_each_chan(schan, &audev->shdma_dev, i) { |
| + BUG_ON(!schan); |
| + shdma_chan_remove(schan); |
| + } |
| + dma_dev->chancnt = 0; |
| +} |
| + |
| +static int audmapp_probe(struct platform_device *pdev) |
| +{ |
| + struct audmapp_pdata *pdata = pdev->dev.platform_data; |
| + struct audmapp_device *audev; |
| + struct shdma_dev *sdev; |
| + struct dma_device *dma_dev; |
| + struct resource *res; |
| + int err, i; |
| + |
| + if (!pdata) |
| + return -ENODEV; |
| + |
| + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| + |
| + audev = devm_kzalloc(&pdev->dev, sizeof(*audev), GFP_KERNEL); |
| + if (!audev) |
| + 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); |
| + |
| + sdev = &audev->shdma_dev; |
| + sdev->ops = &audmapp_shdma_ops; |
| + sdev->desc_size = sizeof(struct shdma_desc); |
| + |
| + dma_dev = &sdev->dma_dev; |
| + dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE; |
| + dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); |
| + |
| + err = shdma_init(&pdev->dev, sdev, AUDMAPP_MAX_CHANNELS); |
| + if (err < 0) |
| + return err; |
| + |
| + platform_set_drvdata(pdev, audev); |
| + |
| + /* 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; |
| + |
| + return err; |
| + |
| +chan_probe_err: |
| + audmapp_chan_remove(audev); |
| + shdma_cleanup(sdev); |
| + |
| + return err; |
| +} |
| + |
| +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; |
| + |
| + dma_async_device_unregister(dma_dev); |
| + |
| + audmapp_chan_remove(audev); |
| + shdma_cleanup(&audev->shdma_dev); |
| + |
| + return 0; |
| +} |
| + |
| +static struct platform_driver audmapp_driver = { |
| + .probe = audmapp_probe, |
| + .remove = audmapp_remove, |
| + .driver = { |
| + .owner = THIS_MODULE, |
| + .name = "rcar-audmapp-engine", |
| + }, |
| +}; |
| +module_platform_driver(audmapp_driver); |
| + |
| +MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); |
| +MODULE_DESCRIPTION("Renesas R-Car Audio DMAC peri-peri driver"); |
| +MODULE_LICENSE("GPL"); |
| diff --git a/include/linux/platform_data/dma-rcar-audmapp.h b/include/linux/platform_data/dma-rcar-audmapp.h |
| new file mode 100644 |
| index 000000000000..471fffebbeb4 |
| --- /dev/null |
| +++ b/include/linux/platform_data/dma-rcar-audmapp.h |
| @@ -0,0 +1,34 @@ |
| +/* |
| + * 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 */ |
| -- |
| 2.1.2 |
| |