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/*
* 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/of_dma.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;
void __iomem *base;
dma_addr_t slave_addr;
u32 chcr;
};
struct audmapp_device {
struct shdma_dev shdma_dev;
struct audmapp_pdata *pdata;
struct device *dev;
void __iomem *chan_reg;
};
struct audmapp_desc {
struct shdma_desc shdma_desc;
dma_addr_t src;
dma_addr_t dst;
};
#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
#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)
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 *sdesc)
{
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;
dev_dbg(dev, "src/dst/chcr = %pad/%pad/%08x\n",
&desc->src, &desc->dst, chcr);
audmapp_write(auchan, desc->src, PDMASAR);
audmapp_write(auchan, desc->dst, PDMADAR);
audmapp_write(auchan, chcr, PDMACHCR);
}
static int audmapp_get_config(struct audmapp_chan *auchan, int slave_id,
u32 *chcr, dma_addr_t *dst)
{
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;
}
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);
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;
return 0;
}
static int audmapp_desc_setup(struct shdma_chan *schan,
struct shdma_desc *sdesc,
dma_addr_t src, dma_addr_t dst, size_t *len)
{
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;
}
static void audmapp_setup_xfer(struct shdma_chan *schan,
int slave_id)
{
}
static dma_addr_t audmapp_slave_addr(struct shdma_chan *schan)
{
struct audmapp_chan *auchan = to_chan(schan);
return auchan->slave_addr;
}
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 audmapp_desc *)buf)[i].shdma_desc;
}
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 shdma_chan *schan;
int i;
shdma_for_each_chan(schan, &audev->shdma_dev, i) {
BUG_ON(!schan);
shdma_chan_remove(schan);
}
}
static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
dma_cap_mask_t mask;
struct dma_chan *chan;
u32 chcr = dma_spec->args[0];
if (dma_spec->args_count != 1)
return NULL;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
chan = dma_request_channel(mask, shdma_chan_filter, NULL);
if (chan)
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