2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:44 +08:00
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#include <linux/of_dma.h>
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2014-03-11 09:11:50 +08:00
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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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void __iomem *base;
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2014-06-18 16:59:28 +08:00
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dma_addr_t slave_addr;
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2014-06-18 16:59:35 +08:00
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u32 chcr;
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:28 +08:00
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struct audmapp_desc {
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struct shdma_desc shdma_desc;
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dma_addr_t src;
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dma_addr_t dst;
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};
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2014-06-18 16:59:44 +08:00
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#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
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2014-03-11 09:11:50 +08:00
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#define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan)
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2014-06-18 16:59:28 +08:00
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#define to_desc(sdesc) container_of(sdesc, struct audmapp_desc, shdma_desc)
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:28 +08:00
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struct shdma_desc *sdesc)
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:28 +08:00
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struct audmapp_desc *desc = to_desc(sdesc);
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2014-03-11 09:11:50 +08:00
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struct device *dev = audev->dev;
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2014-06-18 16:59:35 +08:00
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u32 chcr = auchan->chcr | PDMACHCR_DE;
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2014-03-11 09:11:50 +08:00
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2014-06-18 16:59:28 +08:00
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dev_dbg(dev, "src/dst/chcr = %pad/%pad/%08x\n",
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&desc->src, &desc->dst, chcr);
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2014-03-11 09:11:50 +08:00
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2014-06-18 16:59:28 +08:00
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audmapp_write(auchan, desc->src, PDMASAR);
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audmapp_write(auchan, desc->dst, PDMADAR);
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2014-03-11 09:11:50 +08:00
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audmapp_write(auchan, chcr, PDMACHCR);
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}
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2014-06-18 16:59:44 +08:00
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static void audmapp_get_config(struct audmapp_chan *auchan, int slave_id,
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u32 *chcr, dma_addr_t *dst)
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:44 +08:00
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*chcr = 0;
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*dst = 0;
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if (!pdata) { /* DT */
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*chcr = ((u32)slave_id) << 16;
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auchan->shdma_chan.slave_id = (slave_id) >> 8;
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return;
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}
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/* non-DT */
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2014-03-11 09:11:50 +08:00
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if (slave_id >= AUDMAPP_SLAVE_NUMBER)
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2014-06-18 16:59:44 +08:00
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return;
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2014-03-11 09:11:50 +08:00
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for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
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2014-06-18 16:59:44 +08:00
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if (cfg->slave_id == slave_id) {
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*chcr = cfg->chcr;
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*dst = cfg->dst;
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break;
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}
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:44 +08:00
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u32 chcr;
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dma_addr_t dst;
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audmapp_get_config(auchan, slave_id, &chcr, &dst);
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2014-03-11 09:11:50 +08:00
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if (try)
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return 0;
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2014-06-18 16:59:44 +08:00
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auchan->chcr = chcr;
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auchan->slave_addr = slave_addr ? : dst;
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:28 +08:00
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struct shdma_desc *sdesc,
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2014-03-11 09:11:50 +08:00
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dma_addr_t src, dma_addr_t dst, size_t *len)
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{
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2014-06-18 16:59:28 +08:00
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struct audmapp_desc *desc = to_desc(sdesc);
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:28 +08:00
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desc->src = src;
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desc->dst = dst;
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:28 +08:00
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struct audmapp_chan *auchan = to_chan(schan);
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return auchan->slave_addr;
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:28 +08:00
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return &((struct audmapp_desc *)buf)[i].shdma_desc;
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:44 +08:00
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static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec,
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struct of_dma *ofdma)
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{
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dma_cap_mask_t mask;
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struct dma_chan *chan;
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u32 chcr = dma_spec->args[0];
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if (dma_spec->args_count != 1)
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return NULL;
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dma_cap_zero(mask);
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dma_cap_set(DMA_SLAVE, mask);
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chan = dma_request_channel(mask, shdma_chan_filter, NULL);
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if (chan)
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to_shdma_chan(chan)->hw_req = chcr;
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return chan;
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}
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:44 +08:00
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struct device_node *np = pdev->dev.of_node;
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:44 +08:00
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if (np)
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of_dma_controller_register(np, audmapp_of_xlate, pdev);
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else if (!pdata)
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2014-03-11 09:11:50 +08:00
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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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2014-06-18 16:59:28 +08:00
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sdev->desc_size = sizeof(struct audmapp_desc);
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2014-03-11 09:11:50 +08:00
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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);
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2014-06-18 16:59:44 +08:00
|
|
|
static const struct of_device_id audmapp_of_match[] = {
|
|
|
|
{ .compatible = "renesas,rcar-audmapp", },
|
|
|
|
{},
|
|
|
|
};
|
|
|
|
|
2014-03-11 09:11:50 +08:00
|
|
|
static struct platform_driver audmapp_driver = {
|
|
|
|
.probe = audmapp_probe,
|
|
|
|
.remove = audmapp_remove,
|
|
|
|
.driver = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.name = "rcar-audmapp-engine",
|
2014-06-18 16:59:44 +08:00
|
|
|
.of_match_table = audmapp_of_match,
|
2014-03-11 09:11:50 +08:00
|
|
|
},
|
|
|
|
};
|
|
|
|
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");
|