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>
This commit is contained in:
Kuninori Morimoto
Vinod Koul
Родитель
2e041c9462
Коммит
e43a34e3ec
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@ -29,6 +29,12 @@ config RCAR_HPB_DMAE
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help
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Enable support for the Renesas R-Car series DMA controllers.
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config RCAR_AUDMAC_PP
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tristate "Renesas R-Car Audio DMAC Peripheral Peripheral support"
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depends on SH_DMAE_BASE
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help
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Enable support for the Renesas R-Car Audio DMAC Peripheral Peripheral controllers.
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config SHDMA_R8A73A4
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def_bool y
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depends on ARCH_R8A73A4 && SH_DMAE != n
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@ -7,3 +7,4 @@ endif
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shdma-objs := $(shdma-y)
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obj-$(CONFIG_SUDMAC) += sudmac.o
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obj-$(CONFIG_RCAR_HPB_DMAE) += rcar-hpbdma.o
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obj-$(CONFIG_RCAR_AUDMAC_PP) += rcar-audmapp.o
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@ -0,0 +1,320 @@
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/*
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* This is for Renesas R-Car Audio-DMAC-peri-peri.
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*
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* Copyright (C) 2014 Renesas Electronics Corporation
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* Copyright (C) 2014 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
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*
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* based on the drivers/dma/sh/shdma.c
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*
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* Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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* Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
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* Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
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* Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/dmaengine.h>
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#include <linux/platform_data/dma-rcar-audmapp.h>
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#include <linux/platform_device.h>
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#include <linux/shdma-base.h>
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/*
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* DMA register
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*/
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#define PDMASAR 0x00
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#define PDMADAR 0x04
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#define PDMACHCR 0x0c
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/* PDMACHCR */
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#define PDMACHCR_DE (1 << 0)
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#define AUDMAPP_MAX_CHANNELS 29
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/* Default MEMCPY transfer size = 2^2 = 4 bytes */
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#define LOG2_DEFAULT_XFER_SIZE 2
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#define AUDMAPP_SLAVE_NUMBER 256
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#define AUDMAPP_LEN_MAX (16 * 1024 * 1024)
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struct audmapp_chan {
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struct shdma_chan shdma_chan;
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struct audmapp_slave_config *config;
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void __iomem *base;
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};
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struct audmapp_device {
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struct shdma_dev shdma_dev;
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struct audmapp_pdata *pdata;
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struct device *dev;
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void __iomem *chan_reg;
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};
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#define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan)
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#define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device, \
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struct audmapp_device, shdma_dev.dma_dev)
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static void audmapp_write(struct audmapp_chan *auchan, u32 data, u32 reg)
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{
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struct audmapp_device *audev = to_dev(auchan);
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struct device *dev = audev->dev;
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dev_dbg(dev, "w %p : %08x\n", auchan->base + reg, data);
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iowrite32(data, auchan->base + reg);
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}
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static u32 audmapp_read(struct audmapp_chan *auchan, u32 reg)
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{
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return ioread32(auchan->base + reg);
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}
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static void audmapp_halt(struct shdma_chan *schan)
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{
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struct audmapp_chan *auchan = to_chan(schan);
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int i;
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audmapp_write(auchan, 0, PDMACHCR);
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for (i = 0; i < 1024; i++) {
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if (0 == audmapp_read(auchan, PDMACHCR))
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return;
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udelay(1);
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}
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}
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static void audmapp_start_xfer(struct shdma_chan *schan,
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struct shdma_desc *sdecs)
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{
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struct audmapp_chan *auchan = to_chan(schan);
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struct audmapp_device *audev = to_dev(auchan);
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struct audmapp_slave_config *cfg = auchan->config;
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struct device *dev = audev->dev;
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u32 chcr = cfg->chcr | PDMACHCR_DE;
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dev_dbg(dev, "src/dst/chcr = %pad/%pad/%x\n",
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&cfg->src, &cfg->dst, cfg->chcr);
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audmapp_write(auchan, cfg->src, PDMASAR);
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audmapp_write(auchan, cfg->dst, PDMADAR);
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audmapp_write(auchan, chcr, PDMACHCR);
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}
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static struct audmapp_slave_config *
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audmapp_find_slave(struct audmapp_chan *auchan, int slave_id)
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{
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struct audmapp_device *audev = to_dev(auchan);
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struct audmapp_pdata *pdata = audev->pdata;
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struct audmapp_slave_config *cfg;
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int i;
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if (slave_id >= AUDMAPP_SLAVE_NUMBER)
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return NULL;
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for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
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if (cfg->slave_id == slave_id)
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return cfg;
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return NULL;
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}
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static int audmapp_set_slave(struct shdma_chan *schan, int slave_id,
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dma_addr_t slave_addr, bool try)
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{
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struct audmapp_chan *auchan = to_chan(schan);
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struct audmapp_slave_config *cfg =
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audmapp_find_slave(auchan, slave_id);
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if (!cfg)
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return -ENODEV;
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if (try)
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return 0;
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auchan->config = cfg;
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return 0;
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}
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static int audmapp_desc_setup(struct shdma_chan *schan,
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struct shdma_desc *sdecs,
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dma_addr_t src, dma_addr_t dst, size_t *len)
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{
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struct audmapp_chan *auchan = to_chan(schan);
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struct audmapp_slave_config *cfg = auchan->config;
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if (!cfg)
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return -ENODEV;
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if (*len > (size_t)AUDMAPP_LEN_MAX)
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*len = (size_t)AUDMAPP_LEN_MAX;
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return 0;
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}
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static void audmapp_setup_xfer(struct shdma_chan *schan,
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int slave_id)
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{
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}
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static dma_addr_t audmapp_slave_addr(struct shdma_chan *schan)
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{
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return 0; /* always fixed address */
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}
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static bool audmapp_channel_busy(struct shdma_chan *schan)
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{
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struct audmapp_chan *auchan = to_chan(schan);
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u32 chcr = audmapp_read(auchan, PDMACHCR);
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return chcr & ~PDMACHCR_DE;
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}
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static bool audmapp_desc_completed(struct shdma_chan *schan,
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struct shdma_desc *sdesc)
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{
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return true;
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}
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static struct shdma_desc *audmapp_embedded_desc(void *buf, int i)
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{
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return &((struct shdma_desc *)buf)[i];
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}
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static const struct shdma_ops audmapp_shdma_ops = {
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.halt_channel = audmapp_halt,
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.desc_setup = audmapp_desc_setup,
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.set_slave = audmapp_set_slave,
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.start_xfer = audmapp_start_xfer,
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.embedded_desc = audmapp_embedded_desc,
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.setup_xfer = audmapp_setup_xfer,
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.slave_addr = audmapp_slave_addr,
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.channel_busy = audmapp_channel_busy,
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.desc_completed = audmapp_desc_completed,
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};
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static int audmapp_chan_probe(struct platform_device *pdev,
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struct audmapp_device *audev, int id)
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{
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struct shdma_dev *sdev = &audev->shdma_dev;
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struct audmapp_chan *auchan;
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struct shdma_chan *schan;
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struct device *dev = audev->dev;
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auchan = devm_kzalloc(dev, sizeof(*auchan), GFP_KERNEL);
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if (!auchan)
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return -ENOMEM;
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schan = &auchan->shdma_chan;
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schan->max_xfer_len = AUDMAPP_LEN_MAX;
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shdma_chan_probe(sdev, schan, id);
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auchan->base = audev->chan_reg + 0x20 + (0x10 * id);
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dev_dbg(dev, "%02d : %p / %p", id, auchan->base, audev->chan_reg);
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return 0;
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}
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static void audmapp_chan_remove(struct audmapp_device *audev)
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{
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struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;
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struct shdma_chan *schan;
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int i;
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shdma_for_each_chan(schan, &audev->shdma_dev, i) {
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BUG_ON(!schan);
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shdma_chan_remove(schan);
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}
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dma_dev->chancnt = 0;
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}
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static int audmapp_probe(struct platform_device *pdev)
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{
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struct audmapp_pdata *pdata = pdev->dev.platform_data;
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struct audmapp_device *audev;
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struct shdma_dev *sdev;
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struct dma_device *dma_dev;
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struct resource *res;
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int err, i;
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if (!pdata)
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return -ENODEV;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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audev = devm_kzalloc(&pdev->dev, sizeof(*audev), GFP_KERNEL);
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if (!audev)
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return -ENOMEM;
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audev->dev = &pdev->dev;
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audev->pdata = pdata;
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audev->chan_reg = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(audev->chan_reg))
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return PTR_ERR(audev->chan_reg);
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sdev = &audev->shdma_dev;
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sdev->ops = &audmapp_shdma_ops;
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sdev->desc_size = sizeof(struct shdma_desc);
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dma_dev = &sdev->dma_dev;
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dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
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dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
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err = shdma_init(&pdev->dev, sdev, AUDMAPP_MAX_CHANNELS);
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if (err < 0)
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return err;
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platform_set_drvdata(pdev, audev);
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/* Create DMA Channel */
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for (i = 0; i < AUDMAPP_MAX_CHANNELS; i++) {
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err = audmapp_chan_probe(pdev, audev, i);
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if (err)
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goto chan_probe_err;
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}
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err = dma_async_device_register(dma_dev);
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if (err < 0)
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goto chan_probe_err;
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return err;
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chan_probe_err:
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audmapp_chan_remove(audev);
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shdma_cleanup(sdev);
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return err;
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}
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static int audmapp_remove(struct platform_device *pdev)
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{
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struct audmapp_device *audev = platform_get_drvdata(pdev);
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struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;
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dma_async_device_unregister(dma_dev);
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audmapp_chan_remove(audev);
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shdma_cleanup(&audev->shdma_dev);
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return 0;
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}
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static struct platform_driver audmapp_driver = {
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.probe = audmapp_probe,
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.remove = audmapp_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = "rcar-audmapp-engine",
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},
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};
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module_platform_driver(audmapp_driver);
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MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
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MODULE_DESCRIPTION("Renesas R-Car Audio DMAC peri-peri driver");
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MODULE_LICENSE("GPL");
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@ -0,0 +1,34 @@
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/*
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* This is for Renesas R-Car Audio-DMAC-peri-peri.
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*
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* Copyright (C) 2014 Renesas Electronics Corporation
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* Copyright (C) 2014 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
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*
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* This file is based on the include/linux/sh_dma.h
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*
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* Header for the new SH dmaengine driver
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*
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* Copyright (C) 2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef SH_AUDMAPP_H
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#define SH_AUDMAPP_H
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#include <linux/dmaengine.h>
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struct audmapp_slave_config {
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int slave_id;
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dma_addr_t src;
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dma_addr_t dst;
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u32 chcr;
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};
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struct audmapp_pdata {
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struct audmapp_slave_config *slave;
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int slave_num;
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};
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#endif /* SH_AUDMAPP_H */
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