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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
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
70
71
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 { },
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");
186
