loongson_i2s_plat.c

  1// SPDX-License-Identifier: GPL-2.0
  2//
  3// Loongson I2S controller master mode dirver(platform device)
  4//
  5// Copyright (C) 2023-2024 Loongson Technology Corporation Limited
  6//
  7// Author: Yingkun Meng <mengyingkun@loongson.cn>
  8//         Binbin Zhou <zhoubinbin@loongson.cn>
  9
 10#include <linux/clk.h>
 11#include <linux/dma-mapping.h>
 12#include <linux/module.h>
 13#include <linux/of_dma.h>
 14#include <linux/platform_device.h>
 15#include <linux/pm_runtime.h>
 16#include <sound/dmaengine_pcm.h>
 17#include <sound/pcm.h>
 18#include <sound/pcm_params.h>
 19#include <sound/soc.h>
 20
 21#include "loongson_i2s.h"
 22
 23#define LOONGSON_I2S_RX_DMA_OFFSET	21
 24#define LOONGSON_I2S_TX_DMA_OFFSET	18
 25
 26#define LOONGSON_DMA0_CONF	0x0
 27#define LOONGSON_DMA1_CONF	0x1
 28#define LOONGSON_DMA2_CONF	0x2
 29#define LOONGSON_DMA3_CONF	0x3
 30#define LOONGSON_DMA4_CONF	0x4
 31
 32/* periods_max = PAGE_SIZE / sizeof(struct ls_dma_chan_reg) */
 33static const struct snd_pcm_hardware loongson_pcm_hardware = {
 34	.info = SNDRV_PCM_INFO_MMAP |
 35		SNDRV_PCM_INFO_INTERLEAVED |
 36		SNDRV_PCM_INFO_MMAP_VALID |
 37		SNDRV_PCM_INFO_RESUME |
 38		SNDRV_PCM_INFO_PAUSE,
 39	.formats = SNDRV_PCM_FMTBIT_S16_LE |
 40		   SNDRV_PCM_FMTBIT_S20_3LE |
 41		   SNDRV_PCM_FMTBIT_S24_LE,
 42	.period_bytes_min = 128,
 43	.period_bytes_max = 128 * 1024,
 44	.periods_min = 1,
 45	.periods_max = 64,
 46	.buffer_bytes_max = 1024 * 1024,
 47};
 48
 49static const struct snd_dmaengine_pcm_config loongson_dmaengine_pcm_config = {
 50	.pcm_hardware = &loongson_pcm_hardware,
 51	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
 52	.prealloc_buffer_size = 128 * 1024,
 53};
 54
 55static int loongson_pcm_open(struct snd_soc_component *component,
 56			     struct snd_pcm_substream *substream)
 57{
 58	struct snd_pcm_runtime *runtime = substream->runtime;
 59
 60	if (substream->pcm->device & 1) {
 61		runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 62		runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 63	}
 64
 65	if (substream->pcm->device & 2)
 66		runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
 67				      SNDRV_PCM_INFO_MMAP_VALID);
 68	/*
 69	 * For mysterious reasons (and despite what the manual says)
 70	 * playback samples are lost if the DMA count is not a multiple
 71	 * of the DMA burst size.  Let's add a rule to enforce that.
 72	 */
 73	snd_pcm_hw_constraint_step(runtime, 0,
 74				   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
 75	snd_pcm_hw_constraint_step(runtime, 0,
 76				   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128);
 77	snd_pcm_hw_constraint_integer(substream->runtime,
 78				      SNDRV_PCM_HW_PARAM_PERIODS);
 79
 80	return 0;
 81}
 82
 83static const struct snd_soc_component_driver loongson_i2s_component_driver = {
 84	.name   = LS_I2S_DRVNAME,
 85	.open	= loongson_pcm_open,
 86};
 87
 88static const struct regmap_config loongson_i2s_regmap_config = {
 89	.reg_bits = 32,
 90	.reg_stride = 4,
 91	.val_bits = 32,
 92	.max_register = 0x14,
 93	.cache_type = REGCACHE_FLAT,
 94};
 95
 96static int loongson_i2s_apbdma_config(struct platform_device *pdev)
 97{
 98	int val;
 99	void __iomem *regs;
100
101	regs = devm_platform_ioremap_resource(pdev, 1);
102	if (IS_ERR(regs))
103		return PTR_ERR(regs);
104
105	val = readl(regs);
106	val |= LOONGSON_DMA2_CONF << LOONGSON_I2S_TX_DMA_OFFSET;
107	val |= LOONGSON_DMA3_CONF << LOONGSON_I2S_RX_DMA_OFFSET;
108	writel(val, regs);
109
110	return 0;
111}
112
113static int loongson_i2s_plat_probe(struct platform_device *pdev)
114{
115	struct device *dev = &pdev->dev;
116	struct loongson_i2s *i2s;
117	struct resource *res;
118	struct clk *i2s_clk;
119	int ret;
120
121	i2s = devm_kzalloc(dev, sizeof(*i2s), GFP_KERNEL);
122	if (!i2s)
123		return -ENOMEM;
124
125	ret = loongson_i2s_apbdma_config(pdev);
126	if (ret)
127		return ret;
128
129	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
130	i2s->reg_base = devm_ioremap_resource(&pdev->dev, res);
131	if (IS_ERR(i2s->reg_base))
132		return dev_err_probe(dev, PTR_ERR(i2s->reg_base),
133				     "devm_ioremap_resource failed\n");
134
135	i2s->regmap = devm_regmap_init_mmio(dev, i2s->reg_base,
136					    &loongson_i2s_regmap_config);
137	if (IS_ERR(i2s->regmap))
138		return dev_err_probe(dev, PTR_ERR(i2s->regmap),
139				     "devm_regmap_init_mmio failed\n");
140
141	i2s->playback_dma_data.addr = res->start + LS_I2S_TX_DATA;
142	i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
143	i2s->playback_dma_data.maxburst = 4;
144
145	i2s->capture_dma_data.addr = res->start + LS_I2S_RX_DATA;
146	i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
147	i2s->capture_dma_data.maxburst = 4;
148
149	i2s_clk = devm_clk_get_enabled(dev, NULL);
150	if (IS_ERR(i2s_clk))
151		return dev_err_probe(dev, PTR_ERR(i2s_clk), "clock property invalid\n");
152	i2s->clk_rate = clk_get_rate(i2s_clk);
153
154	dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
155	dev_set_name(dev, LS_I2S_DRVNAME);
156	dev_set_drvdata(dev, i2s);
157
158	ret = devm_snd_soc_register_component(dev, &loongson_i2s_component_driver,
159					      &loongson_i2s_dai, 1);
160	if (ret)
161		return dev_err_probe(dev, ret, "failed to register DAI\n");
162
163	return devm_snd_dmaengine_pcm_register(dev, &loongson_dmaengine_pcm_config,
164					       SND_DMAENGINE_PCM_FLAG_COMPAT);
165}
166
167static const struct of_device_id loongson_i2s_ids[] = {
168	{ .compatible = "loongson,ls2k1000-i2s" },
169	{ /* sentinel */ },
170};
171MODULE_DEVICE_TABLE(of, loongson_i2s_ids);
172
173static struct platform_driver loongson_i2s_driver = {
174	.probe = loongson_i2s_plat_probe,
175	.driver = {
176		.name = "loongson-i2s-plat",
177		.pm = pm_sleep_ptr(&loongson_i2s_pm),
178		.of_match_table = loongson_i2s_ids,
179	},
180};
181module_platform_driver(loongson_i2s_driver);
182
183MODULE_DESCRIPTION("Loongson I2S Master Mode ASoC Driver");
184MODULE_AUTHOR("Loongson Technology Corporation Limited");
185MODULE_LICENSE("GPL");