2 * This is for Renesas R-Car Audio-DMAC-peri-peri.
4 * Copyright (C) 2014 Renesas Electronics Corporation
5 * Copyright (C) 2014 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
7 * based on the drivers/dma/sh/shdma.c
9 * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
10 * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
11 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
12 * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
14 * This is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
20 #include <linux/delay.h>
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/slab.h>
24 #include <linux/dmaengine.h>
25 #include <linux/platform_data/dma-rcar-audmapp.h>
26 #include <linux/platform_device.h>
27 #include <linux/shdma-base.h>
37 #define PDMACHCR_DE (1 << 0)
39 #define AUDMAPP_MAX_CHANNELS 29
41 /* Default MEMCPY transfer size = 2^2 = 4 bytes */
42 #define LOG2_DEFAULT_XFER_SIZE 2
43 #define AUDMAPP_SLAVE_NUMBER 256
44 #define AUDMAPP_LEN_MAX (16 * 1024 * 1024)
47 struct shdma_chan shdma_chan;
49 dma_addr_t slave_addr;
53 struct audmapp_device {
54 struct shdma_dev shdma_dev;
55 struct audmapp_pdata *pdata;
57 void __iomem *chan_reg;
61 struct shdma_desc shdma_desc;
66 #define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan)
67 #define to_desc(sdesc) container_of(sdesc, struct audmapp_desc, shdma_desc)
68 #define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device, \
69 struct audmapp_device, shdma_dev.dma_dev)
71 static void audmapp_write(struct audmapp_chan *auchan, u32 data, u32 reg)
73 struct audmapp_device *audev = to_dev(auchan);
74 struct device *dev = audev->dev;
76 dev_dbg(dev, "w %p : %08x\n", auchan->base + reg, data);
78 iowrite32(data, auchan->base + reg);
81 static u32 audmapp_read(struct audmapp_chan *auchan, u32 reg)
83 return ioread32(auchan->base + reg);
86 static void audmapp_halt(struct shdma_chan *schan)
88 struct audmapp_chan *auchan = to_chan(schan);
91 audmapp_write(auchan, 0, PDMACHCR);
93 for (i = 0; i < 1024; i++) {
94 if (0 == audmapp_read(auchan, PDMACHCR))
100 static void audmapp_start_xfer(struct shdma_chan *schan,
101 struct shdma_desc *sdesc)
103 struct audmapp_chan *auchan = to_chan(schan);
104 struct audmapp_device *audev = to_dev(auchan);
105 struct audmapp_desc *desc = to_desc(sdesc);
106 struct device *dev = audev->dev;
107 u32 chcr = auchan->chcr | PDMACHCR_DE;
109 dev_dbg(dev, "src/dst/chcr = %pad/%pad/%08x\n",
110 &desc->src, &desc->dst, chcr);
112 audmapp_write(auchan, desc->src, PDMASAR);
113 audmapp_write(auchan, desc->dst, PDMADAR);
114 audmapp_write(auchan, chcr, PDMACHCR);
117 static struct audmapp_slave_config *
118 audmapp_find_slave(struct audmapp_chan *auchan, int slave_id)
120 struct audmapp_device *audev = to_dev(auchan);
121 struct audmapp_pdata *pdata = audev->pdata;
122 struct audmapp_slave_config *cfg;
125 if (slave_id >= AUDMAPP_SLAVE_NUMBER)
128 for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
129 if (cfg->slave_id == slave_id)
135 static int audmapp_set_slave(struct shdma_chan *schan, int slave_id,
136 dma_addr_t slave_addr, bool try)
138 struct audmapp_chan *auchan = to_chan(schan);
139 struct audmapp_slave_config *cfg =
140 audmapp_find_slave(auchan, slave_id);
147 auchan->chcr = cfg->chcr;
148 auchan->slave_addr = slave_addr ? : cfg->dst;
153 static int audmapp_desc_setup(struct shdma_chan *schan,
154 struct shdma_desc *sdesc,
155 dma_addr_t src, dma_addr_t dst, size_t *len)
157 struct audmapp_desc *desc = to_desc(sdesc);
159 if (*len > (size_t)AUDMAPP_LEN_MAX)
160 *len = (size_t)AUDMAPP_LEN_MAX;
168 static void audmapp_setup_xfer(struct shdma_chan *schan,
173 static dma_addr_t audmapp_slave_addr(struct shdma_chan *schan)
175 struct audmapp_chan *auchan = to_chan(schan);
177 return auchan->slave_addr;
180 static bool audmapp_channel_busy(struct shdma_chan *schan)
182 struct audmapp_chan *auchan = to_chan(schan);
183 u32 chcr = audmapp_read(auchan, PDMACHCR);
185 return chcr & ~PDMACHCR_DE;
188 static bool audmapp_desc_completed(struct shdma_chan *schan,
189 struct shdma_desc *sdesc)
194 static struct shdma_desc *audmapp_embedded_desc(void *buf, int i)
196 return &((struct audmapp_desc *)buf)[i].shdma_desc;
199 static const struct shdma_ops audmapp_shdma_ops = {
200 .halt_channel = audmapp_halt,
201 .desc_setup = audmapp_desc_setup,
202 .set_slave = audmapp_set_slave,
203 .start_xfer = audmapp_start_xfer,
204 .embedded_desc = audmapp_embedded_desc,
205 .setup_xfer = audmapp_setup_xfer,
206 .slave_addr = audmapp_slave_addr,
207 .channel_busy = audmapp_channel_busy,
208 .desc_completed = audmapp_desc_completed,
211 static int audmapp_chan_probe(struct platform_device *pdev,
212 struct audmapp_device *audev, int id)
214 struct shdma_dev *sdev = &audev->shdma_dev;
215 struct audmapp_chan *auchan;
216 struct shdma_chan *schan;
217 struct device *dev = audev->dev;
219 auchan = devm_kzalloc(dev, sizeof(*auchan), GFP_KERNEL);
223 schan = &auchan->shdma_chan;
224 schan->max_xfer_len = AUDMAPP_LEN_MAX;
226 shdma_chan_probe(sdev, schan, id);
228 auchan->base = audev->chan_reg + 0x20 + (0x10 * id);
229 dev_dbg(dev, "%02d : %p / %p", id, auchan->base, audev->chan_reg);
234 static void audmapp_chan_remove(struct audmapp_device *audev)
236 struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;
237 struct shdma_chan *schan;
240 shdma_for_each_chan(schan, &audev->shdma_dev, i) {
242 shdma_chan_remove(schan);
244 dma_dev->chancnt = 0;
247 static int audmapp_probe(struct platform_device *pdev)
249 struct audmapp_pdata *pdata = pdev->dev.platform_data;
250 struct audmapp_device *audev;
251 struct shdma_dev *sdev;
252 struct dma_device *dma_dev;
253 struct resource *res;
259 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
261 audev = devm_kzalloc(&pdev->dev, sizeof(*audev), GFP_KERNEL);
265 audev->dev = &pdev->dev;
266 audev->pdata = pdata;
267 audev->chan_reg = devm_ioremap_resource(&pdev->dev, res);
268 if (IS_ERR(audev->chan_reg))
269 return PTR_ERR(audev->chan_reg);
271 sdev = &audev->shdma_dev;
272 sdev->ops = &audmapp_shdma_ops;
273 sdev->desc_size = sizeof(struct audmapp_desc);
275 dma_dev = &sdev->dma_dev;
276 dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
277 dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
279 err = shdma_init(&pdev->dev, sdev, AUDMAPP_MAX_CHANNELS);
283 platform_set_drvdata(pdev, audev);
285 /* Create DMA Channel */
286 for (i = 0; i < AUDMAPP_MAX_CHANNELS; i++) {
287 err = audmapp_chan_probe(pdev, audev, i);
292 err = dma_async_device_register(dma_dev);
299 audmapp_chan_remove(audev);
305 static int audmapp_remove(struct platform_device *pdev)
307 struct audmapp_device *audev = platform_get_drvdata(pdev);
308 struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;
310 dma_async_device_unregister(dma_dev);
312 audmapp_chan_remove(audev);
313 shdma_cleanup(&audev->shdma_dev);
318 static struct platform_driver audmapp_driver = {
319 .probe = audmapp_probe,
320 .remove = audmapp_remove,
322 .owner = THIS_MODULE,
323 .name = "rcar-audmapp-engine",
326 module_platform_driver(audmapp_driver);
328 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
329 MODULE_DESCRIPTION("Renesas R-Car Audio DMAC peri-peri driver");
330 MODULE_LICENSE("GPL");