+++ /dev/null
-/*
- * 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)
- to_shdma_chan(chan)->hw_req = chcr;
-
- return chan;
-}
-
-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 resource *res;
- int err, i;
-
- if (np)
- of_dma_controller_register(np, audmapp_of_xlate, pdev);
- else 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 audmapp_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 const struct of_device_id audmapp_of_match[] = {
- { .compatible = "renesas,rcar-audmapp", },
- {},
-};
-
-static struct platform_driver audmapp_driver = {
- .probe = audmapp_probe,
- .remove = audmapp_remove,
- .driver = {
- .name = "rcar-audmapp-engine",
- .of_match_table = audmapp_of_match,
- },
-};
-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");
projects / openwrt / staging / blogic.git / commitdiff