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/of_dma.h>
26 #include <linux/platform_data/dma-rcar-audmapp.h>
27 #include <linux/platform_device.h>
28 #include <linux/shdma-base.h>
38 #define PDMACHCR_DE (1 << 0)
40 #define AUDMAPP_MAX_CHANNELS 29
42 /* Default MEMCPY transfer size = 2^2 = 4 bytes */
43 #define LOG2_DEFAULT_XFER_SIZE 2
44 #define AUDMAPP_SLAVE_NUMBER 256
45 #define AUDMAPP_LEN_MAX (16 * 1024 * 1024)
48 struct shdma_chan shdma_chan;
50 dma_addr_t slave_addr;
54 struct audmapp_device {
55 struct shdma_dev shdma_dev;
56 struct audmapp_pdata *pdata;
58 void __iomem *chan_reg;
62 struct shdma_desc shdma_desc;
67 #define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
69 #define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan)
70 #define to_desc(sdesc) container_of(sdesc, struct audmapp_desc, shdma_desc)
71 #define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device, \
72 struct audmapp_device, shdma_dev.dma_dev)
74 static void audmapp_write(struct audmapp_chan *auchan, u32 data, u32 reg)
76 struct audmapp_device *audev = to_dev(auchan);
77 struct device *dev = audev->dev;
79 dev_dbg(dev, "w %p : %08x\n", auchan->base + reg, data);
81 iowrite32(data, auchan->base + reg);
84 static u32 audmapp_read(struct audmapp_chan *auchan, u32 reg)
86 return ioread32(auchan->base + reg);
89 static void audmapp_halt(struct shdma_chan *schan)
91 struct audmapp_chan *auchan = to_chan(schan);
94 audmapp_write(auchan, 0, PDMACHCR);
96 for (i = 0; i < 1024; i++) {
97 if (0 == audmapp_read(auchan, PDMACHCR))
103 static void audmapp_start_xfer(struct shdma_chan *schan,
104 struct shdma_desc *sdesc)
106 struct audmapp_chan *auchan = to_chan(schan);
107 struct audmapp_device *audev = to_dev(auchan);
108 struct audmapp_desc *desc = to_desc(sdesc);
109 struct device *dev = audev->dev;
110 u32 chcr = auchan->chcr | PDMACHCR_DE;
112 dev_dbg(dev, "src/dst/chcr = %pad/%pad/%08x\n",
113 &desc->src, &desc->dst, chcr);
115 audmapp_write(auchan, desc->src, PDMASAR);
116 audmapp_write(auchan, desc->dst, PDMADAR);
117 audmapp_write(auchan, chcr, PDMACHCR);
120 static int audmapp_get_config(struct audmapp_chan *auchan, int slave_id,
121 u32 *chcr, dma_addr_t *dst)
123 struct audmapp_device *audev = to_dev(auchan);
124 struct audmapp_pdata *pdata = audev->pdata;
125 struct audmapp_slave_config *cfg;
131 if (!pdata) { /* DT */
132 *chcr = ((u32)slave_id) << 16;
133 auchan->shdma_chan.slave_id = (slave_id) >> 8;
139 if (slave_id >= AUDMAPP_SLAVE_NUMBER)
142 for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
143 if (cfg->slave_id == slave_id) {
152 static int audmapp_set_slave(struct shdma_chan *schan, int slave_id,
153 dma_addr_t slave_addr, bool try)
155 struct audmapp_chan *auchan = to_chan(schan);
160 ret = audmapp_get_config(auchan, slave_id, &chcr, &dst);
168 auchan->slave_addr = slave_addr ? : dst;
173 static int audmapp_desc_setup(struct shdma_chan *schan,
174 struct shdma_desc *sdesc,
175 dma_addr_t src, dma_addr_t dst, size_t *len)
177 struct audmapp_desc *desc = to_desc(sdesc);
179 if (*len > (size_t)AUDMAPP_LEN_MAX)
180 *len = (size_t)AUDMAPP_LEN_MAX;
188 static void audmapp_setup_xfer(struct shdma_chan *schan,
193 static dma_addr_t audmapp_slave_addr(struct shdma_chan *schan)
195 struct audmapp_chan *auchan = to_chan(schan);
197 return auchan->slave_addr;
200 static bool audmapp_channel_busy(struct shdma_chan *schan)
202 struct audmapp_chan *auchan = to_chan(schan);
203 u32 chcr = audmapp_read(auchan, PDMACHCR);
205 return chcr & ~PDMACHCR_DE;
208 static bool audmapp_desc_completed(struct shdma_chan *schan,
209 struct shdma_desc *sdesc)
214 static struct shdma_desc *audmapp_embedded_desc(void *buf, int i)
216 return &((struct audmapp_desc *)buf)[i].shdma_desc;
219 static const struct shdma_ops audmapp_shdma_ops = {
220 .halt_channel = audmapp_halt,
221 .desc_setup = audmapp_desc_setup,
222 .set_slave = audmapp_set_slave,
223 .start_xfer = audmapp_start_xfer,
224 .embedded_desc = audmapp_embedded_desc,
225 .setup_xfer = audmapp_setup_xfer,
226 .slave_addr = audmapp_slave_addr,
227 .channel_busy = audmapp_channel_busy,
228 .desc_completed = audmapp_desc_completed,
231 static int audmapp_chan_probe(struct platform_device *pdev,
232 struct audmapp_device *audev, int id)
234 struct shdma_dev *sdev = &audev->shdma_dev;
235 struct audmapp_chan *auchan;
236 struct shdma_chan *schan;
237 struct device *dev = audev->dev;
239 auchan = devm_kzalloc(dev, sizeof(*auchan), GFP_KERNEL);
243 schan = &auchan->shdma_chan;
244 schan->max_xfer_len = AUDMAPP_LEN_MAX;
246 shdma_chan_probe(sdev, schan, id);
248 auchan->base = audev->chan_reg + 0x20 + (0x10 * id);
249 dev_dbg(dev, "%02d : %p / %p", id, auchan->base, audev->chan_reg);
254 static void audmapp_chan_remove(struct audmapp_device *audev)
256 struct shdma_chan *schan;
259 shdma_for_each_chan(schan, &audev->shdma_dev, i) {
261 shdma_chan_remove(schan);
265 static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec,
266 struct of_dma *ofdma)
269 struct dma_chan *chan;
270 u32 chcr = dma_spec->args[0];
272 if (dma_spec->args_count != 1)
276 dma_cap_set(DMA_SLAVE, mask);
278 chan = dma_request_channel(mask, shdma_chan_filter, NULL);
280 to_shdma_chan(chan)->hw_req = chcr;
285 static int audmapp_probe(struct platform_device *pdev)
287 struct audmapp_pdata *pdata = pdev->dev.platform_data;
288 struct device_node *np = pdev->dev.of_node;
289 struct audmapp_device *audev;
290 struct shdma_dev *sdev;
291 struct dma_device *dma_dev;
292 struct resource *res;
296 of_dma_controller_register(np, audmapp_of_xlate, pdev);
300 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
302 audev = devm_kzalloc(&pdev->dev, sizeof(*audev), GFP_KERNEL);
306 audev->dev = &pdev->dev;
307 audev->pdata = pdata;
308 audev->chan_reg = devm_ioremap_resource(&pdev->dev, res);
309 if (IS_ERR(audev->chan_reg))
310 return PTR_ERR(audev->chan_reg);
312 sdev = &audev->shdma_dev;
313 sdev->ops = &audmapp_shdma_ops;
314 sdev->desc_size = sizeof(struct audmapp_desc);
316 dma_dev = &sdev->dma_dev;
317 dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
318 dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
320 err = shdma_init(&pdev->dev, sdev, AUDMAPP_MAX_CHANNELS);
324 platform_set_drvdata(pdev, audev);
326 /* Create DMA Channel */
327 for (i = 0; i < AUDMAPP_MAX_CHANNELS; i++) {
328 err = audmapp_chan_probe(pdev, audev, i);
333 err = dma_async_device_register(dma_dev);
340 audmapp_chan_remove(audev);
346 static int audmapp_remove(struct platform_device *pdev)
348 struct audmapp_device *audev = platform_get_drvdata(pdev);
349 struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;
351 dma_async_device_unregister(dma_dev);
353 audmapp_chan_remove(audev);
354 shdma_cleanup(&audev->shdma_dev);
359 static const struct of_device_id audmapp_of_match[] = {
360 { .compatible = "renesas,rcar-audmapp", },
364 static struct platform_driver audmapp_driver = {
365 .probe = audmapp_probe,
366 .remove = audmapp_remove,
368 .name = "rcar-audmapp-engine",
369 .of_match_table = audmapp_of_match,
372 module_platform_driver(audmapp_driver);
374 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
375 MODULE_DESCRIPTION("Renesas R-Car Audio DMAC peri-peri driver");
376 MODULE_LICENSE("GPL");