--- /dev/null
+/*
+ * IMG I2S input controller driver
+ *
+ * Copyright (C) 2015 Imagination Technologies Ltd.
+ *
+ * Author: Damien Horsley <Damien.Horsley@imgtec.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include <sound/core.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#define IMG_I2S_IN_RX_FIFO 0x0
+
+#define IMG_I2S_IN_CTL 0x4
+#define IMG_I2S_IN_CTL_ACTIVE_CHAN_MASK 0xfffffffc
+#define IMG_I2S_IN_CTL_ACTIVE_CH_SHIFT 2
+#define IMG_I2S_IN_CTL_16PACK_MASK BIT(1)
+#define IMG_I2S_IN_CTL_ME_MASK BIT(0)
+
+#define IMG_I2S_IN_CH_CTL 0x4
+#define IMG_I2S_IN_CH_CTL_CCDEL_MASK 0x38000
+#define IMG_I2S_IN_CH_CTL_CCDEL_SHIFT 15
+#define IMG_I2S_IN_CH_CTL_FEN_MASK BIT(14)
+#define IMG_I2S_IN_CH_CTL_FMODE_MASK BIT(13)
+#define IMG_I2S_IN_CH_CTL_16PACK_MASK BIT(12)
+#define IMG_I2S_IN_CH_CTL_JUST_MASK BIT(10)
+#define IMG_I2S_IN_CH_CTL_PACKH_MASK BIT(9)
+#define IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK BIT(8)
+#define IMG_I2S_IN_CH_CTL_BLKP_MASK BIT(7)
+#define IMG_I2S_IN_CH_CTL_FIFO_FLUSH_MASK BIT(6)
+#define IMG_I2S_IN_CH_CTL_LRD_MASK BIT(3)
+#define IMG_I2S_IN_CH_CTL_FW_MASK BIT(2)
+#define IMG_I2S_IN_CH_CTL_SW_MASK BIT(1)
+#define IMG_I2S_IN_CH_CTL_ME_MASK BIT(0)
+
+#define IMG_I2S_IN_CH_STRIDE 0x20
+
+struct img_i2s_in {
+ void __iomem *base;
+ struct clk *clk_sys;
+ struct snd_dmaengine_dai_dma_data dma_data;
+ struct device *dev;
+ unsigned int max_i2s_chan;
+ void __iomem *channel_base;
+ unsigned int active_channels;
+ struct snd_soc_dai_driver dai_driver;
+};
+
+static inline void img_i2s_in_writel(struct img_i2s_in *i2s, u32 val, u32 reg)
+{
+ writel(val, i2s->base + reg);
+}
+
+static inline u32 img_i2s_in_readl(struct img_i2s_in *i2s, u32 reg)
+{
+ return readl(i2s->base + reg);
+}
+
+static inline void img_i2s_in_ch_writel(struct img_i2s_in *i2s, u32 chan,
+ u32 val, u32 reg)
+{
+ writel(val, i2s->channel_base + (chan * IMG_I2S_IN_CH_STRIDE) + reg);
+}
+
+static inline u32 img_i2s_in_ch_readl(struct img_i2s_in *i2s, u32 chan,
+ u32 reg)
+{
+ return readl(i2s->channel_base + (chan * IMG_I2S_IN_CH_STRIDE) + reg);
+}
+
+static inline void img_i2s_in_ch_disable(struct img_i2s_in *i2s, u32 chan)
+{
+ u32 reg;
+
+ reg = img_i2s_in_ch_readl(i2s, chan, IMG_I2S_IN_CH_CTL);
+ reg &= ~IMG_I2S_IN_CH_CTL_ME_MASK;
+ img_i2s_in_ch_writel(i2s, chan, reg, IMG_I2S_IN_CH_CTL);
+}
+
+static inline void img_i2s_in_ch_enable(struct img_i2s_in *i2s, u32 chan)
+{
+ u32 reg;
+
+ reg = img_i2s_in_ch_readl(i2s, chan, IMG_I2S_IN_CH_CTL);
+ reg |= IMG_I2S_IN_CH_CTL_ME_MASK;
+ img_i2s_in_ch_writel(i2s, chan, reg, IMG_I2S_IN_CH_CTL);
+}
+
+static inline void img_i2s_in_disable(struct img_i2s_in *i2s)
+{
+ u32 reg;
+
+ reg = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL);
+ reg &= ~IMG_I2S_IN_CTL_ME_MASK;
+ img_i2s_in_writel(i2s, reg, IMG_I2S_IN_CTL);
+}
+
+static inline void img_i2s_in_enable(struct img_i2s_in *i2s)
+{
+ u32 reg;
+
+ reg = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL);
+ reg |= IMG_I2S_IN_CTL_ME_MASK;
+ img_i2s_in_writel(i2s, reg, IMG_I2S_IN_CTL);
+}
+
+static inline void img_i2s_in_flush(struct img_i2s_in *i2s)
+{
+ int i;
+ u32 reg;
+
+ for (i = 0; i < i2s->active_channels; i++) {
+ reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL);
+ reg |= IMG_I2S_IN_CH_CTL_FIFO_FLUSH_MASK;
+ img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
+ reg &= ~IMG_I2S_IN_CH_CTL_FIFO_FLUSH_MASK;
+ img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
+ }
+}
+
+static int img_i2s_in_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ img_i2s_in_enable(i2s);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ img_i2s_in_disable(i2s);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int img_i2s_in_check_rate(struct img_i2s_in *i2s,
+ unsigned int sample_rate, unsigned int frame_size,
+ unsigned int *bclk_filter_enable,
+ unsigned int *bclk_filter_value)
+{
+ unsigned int bclk_freq, cur_freq;
+
+ bclk_freq = sample_rate * frame_size;
+
+ cur_freq = clk_get_rate(i2s->clk_sys);
+
+ if (cur_freq >= bclk_freq * 8) {
+ *bclk_filter_enable = 1;
+ *bclk_filter_value = 0;
+ } else if (cur_freq >= bclk_freq * 7) {
+ *bclk_filter_enable = 1;
+ *bclk_filter_value = 1;
+ } else if (cur_freq >= bclk_freq * 6) {
+ *bclk_filter_enable = 0;
+ *bclk_filter_value = 0;
+ } else {
+ dev_err(i2s->dev,
+ "Sys clock rate %u insufficient for sample rate %u\n",
+ cur_freq, sample_rate);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int img_i2s_in_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+ struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
+ unsigned int rate, channels, i2s_channels, frame_size;
+ unsigned int bclk_filter_enable, bclk_filter_value;
+ int i, ret = 0;
+ u32 reg, control_mask, chan_control_mask;
+ u32 control_set = 0, chan_control_set = 0;
+ snd_pcm_format_t format;
+
+ rate = params_rate(params);
+ format = params_format(params);
+ channels = params_channels(params);
+ i2s_channels = channels / 2;
+
+ switch (format) {
+ case SNDRV_PCM_FORMAT_S32_LE:
+ frame_size = 64;
+ chan_control_set |= IMG_I2S_IN_CH_CTL_SW_MASK;
+ chan_control_set |= IMG_I2S_IN_CH_CTL_FW_MASK;
+ chan_control_set |= IMG_I2S_IN_CH_CTL_PACKH_MASK;
+ break;
+ case SNDRV_PCM_FORMAT_S24_LE:
+ frame_size = 64;
+ chan_control_set |= IMG_I2S_IN_CH_CTL_SW_MASK;
+ chan_control_set |= IMG_I2S_IN_CH_CTL_FW_MASK;
+ break;
+ case SNDRV_PCM_FORMAT_S16_LE:
+ frame_size = 32;
+ control_set |= IMG_I2S_IN_CTL_16PACK_MASK;
+ chan_control_set |= IMG_I2S_IN_CH_CTL_16PACK_MASK;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if ((channels < 2) ||
+ (channels > (i2s->max_i2s_chan * 2)) ||
+ (channels % 2))
+ return -EINVAL;
+
+ control_set |= ((i2s_channels - 1) << IMG_I2S_IN_CTL_ACTIVE_CH_SHIFT);
+
+ ret = img_i2s_in_check_rate(i2s, rate, frame_size,
+ &bclk_filter_enable, &bclk_filter_value);
+ if (ret < 0)
+ return ret;
+
+ if (bclk_filter_enable)
+ chan_control_set |= IMG_I2S_IN_CH_CTL_FEN_MASK;
+
+ if (bclk_filter_value)
+ chan_control_set |= IMG_I2S_IN_CH_CTL_FMODE_MASK;
+
+ control_mask = IMG_I2S_IN_CTL_16PACK_MASK |
+ IMG_I2S_IN_CTL_ACTIVE_CHAN_MASK;
+
+ chan_control_mask = IMG_I2S_IN_CH_CTL_16PACK_MASK |
+ IMG_I2S_IN_CH_CTL_FEN_MASK |
+ IMG_I2S_IN_CH_CTL_FMODE_MASK |
+ IMG_I2S_IN_CH_CTL_SW_MASK |
+ IMG_I2S_IN_CH_CTL_FW_MASK |
+ IMG_I2S_IN_CH_CTL_PACKH_MASK;
+
+ reg = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL);
+ reg = (reg & ~control_mask) | control_set;
+ img_i2s_in_writel(i2s, reg, IMG_I2S_IN_CTL);
+
+ for (i = 0; i < i2s->active_channels; i++)
+ img_i2s_in_ch_disable(i2s, i);
+
+ for (i = 0; i < i2s->max_i2s_chan; i++) {
+ reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL);
+ reg = (reg & ~chan_control_mask) | chan_control_set;
+ img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
+ }
+
+ i2s->active_channels = i2s_channels;
+
+ img_i2s_in_flush(i2s);
+
+ for (i = 0; i < i2s->active_channels; i++)
+ img_i2s_in_ch_enable(i2s, i);
+
+ return 0;
+}
+
+static int img_i2s_in_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
+ int i;
+ u32 chan_control_mask, lrd_set = 0, blkp_set = 0, chan_control_set = 0;
+ u32 reg;
+
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ lrd_set |= IMG_I2S_IN_CH_CTL_LRD_MASK;
+ break;
+ case SND_SOC_DAIFMT_NB_IF:
+ break;
+ case SND_SOC_DAIFMT_IB_NF:
+ lrd_set |= IMG_I2S_IN_CH_CTL_LRD_MASK;
+ blkp_set |= IMG_I2S_IN_CH_CTL_BLKP_MASK;
+ break;
+ case SND_SOC_DAIFMT_IB_IF:
+ blkp_set |= IMG_I2S_IN_CH_CTL_BLKP_MASK;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ chan_control_set |= IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBM_CFM:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ chan_control_mask = IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK;
+
+ for (i = 0; i < i2s->active_channels; i++)
+ img_i2s_in_ch_disable(i2s, i);
+
+ /*
+ * BLKP and LRD must be set during separate register writes
+ */
+ for (i = 0; i < i2s->max_i2s_chan; i++) {
+ reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL);
+ reg = (reg & ~chan_control_mask) | chan_control_set;
+ img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
+ reg = (reg & ~IMG_I2S_IN_CH_CTL_BLKP_MASK) | blkp_set;
+ img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
+ reg = (reg & ~IMG_I2S_IN_CH_CTL_LRD_MASK) | lrd_set;
+ img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
+ }
+
+ for (i = 0; i < i2s->active_channels; i++)
+ img_i2s_in_ch_enable(i2s, i);
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops img_i2s_in_dai_ops = {
+ .trigger = img_i2s_in_trigger,
+ .hw_params = img_i2s_in_hw_params,
+ .set_fmt = img_i2s_in_set_fmt
+};
+
+static int img_i2s_in_dai_probe(struct snd_soc_dai *dai)
+{
+ struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
+
+ snd_soc_dai_init_dma_data(dai, NULL, &i2s->dma_data);
+
+ return 0;
+}
+
+static const struct snd_soc_component_driver img_i2s_in_component = {
+ .name = "img-i2s-in"
+};
+
+static int img_i2s_in_dma_prepare_slave_config(struct snd_pcm_substream *st,
+ struct snd_pcm_hw_params *params, struct dma_slave_config *sc)
+{
+ unsigned int i2s_channels = params_channels(params) / 2;
+ struct snd_soc_pcm_runtime *rtd = st->private_data;
+ struct snd_dmaengine_dai_dma_data *dma_data;
+ int ret;
+
+ dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, st);
+
+ ret = snd_hwparams_to_dma_slave_config(st, params, sc);
+ if (ret)
+ return ret;
+
+ sc->src_addr = dma_data->addr;
+ sc->src_addr_width = dma_data->addr_width;
+ sc->src_maxburst = 4 * i2s_channels;
+
+ return 0;
+}
+
+static const struct snd_dmaengine_pcm_config img_i2s_in_dma_config = {
+ .prepare_slave_config = img_i2s_in_dma_prepare_slave_config
+};
+
+static int img_i2s_in_probe(struct platform_device *pdev)
+{
+ struct img_i2s_in *i2s;
+ struct resource *res;
+ void __iomem *base;
+ int ret, i;
+ struct reset_control *rst;
+ unsigned int max_i2s_chan_pow_2;
+ struct device *dev = &pdev->dev;
+
+ i2s = devm_kzalloc(dev, sizeof(*i2s), GFP_KERNEL);
+ if (!i2s)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, i2s);
+
+ i2s->dev = dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ i2s->base = base;
+
+ if (of_property_read_u32(pdev->dev.of_node, "img,i2s-channels",
+ &i2s->max_i2s_chan)) {
+ dev_err(dev, "No img,i2s-channels property\n");
+ return -EINVAL;
+ }
+
+ max_i2s_chan_pow_2 = 1 << get_count_order(i2s->max_i2s_chan);
+
+ i2s->channel_base = base + (max_i2s_chan_pow_2 * 0x20);
+
+ i2s->clk_sys = devm_clk_get(dev, "sys");
+ if (IS_ERR(i2s->clk_sys)) {
+ if (PTR_ERR(i2s->clk_sys) != -EPROBE_DEFER)
+ dev_err(dev, "Failed to acquire clock 'sys'\n");
+ return PTR_ERR(i2s->clk_sys);
+ }
+
+ ret = clk_prepare_enable(i2s->clk_sys);
+ if (ret)
+ return ret;
+
+ i2s->active_channels = 1;
+ i2s->dma_data.addr = res->start + IMG_I2S_IN_RX_FIFO;
+ i2s->dma_data.addr_width = 4;
+
+ i2s->dai_driver.probe = img_i2s_in_dai_probe;
+ i2s->dai_driver.capture.channels_min = 2;
+ i2s->dai_driver.capture.channels_max = i2s->max_i2s_chan * 2;
+ i2s->dai_driver.capture.rates = SNDRV_PCM_RATE_8000_192000;
+ i2s->dai_driver.capture.formats = SNDRV_PCM_FMTBIT_S32_LE |
+ SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE;
+ i2s->dai_driver.ops = &img_i2s_in_dai_ops;
+
+ rst = devm_reset_control_get(dev, "rst");
+ if (IS_ERR(rst)) {
+ if (PTR_ERR(rst) == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ goto err_clk_disable;
+ }
+
+ dev_dbg(dev, "No top level reset found\n");
+
+ img_i2s_in_disable(i2s);
+
+ for (i = 0; i < i2s->max_i2s_chan; i++)
+ img_i2s_in_ch_disable(i2s, i);
+ } else {
+ reset_control_assert(rst);
+ reset_control_deassert(rst);
+ }
+
+ img_i2s_in_writel(i2s, 0, IMG_I2S_IN_CTL);
+
+ for (i = 0; i < i2s->max_i2s_chan; i++)
+ img_i2s_in_ch_writel(i2s, i,
+ (4 << IMG_I2S_IN_CH_CTL_CCDEL_SHIFT) |
+ IMG_I2S_IN_CH_CTL_JUST_MASK |
+ IMG_I2S_IN_CH_CTL_FW_MASK, IMG_I2S_IN_CH_CTL);
+
+ ret = devm_snd_soc_register_component(dev, &img_i2s_in_component,
+ &i2s->dai_driver, 1);
+ if (ret)
+ goto err_clk_disable;
+
+ ret = devm_snd_dmaengine_pcm_register(dev, &img_i2s_in_dma_config, 0);
+ if (ret)
+ goto err_clk_disable;
+
+ return 0;
+
+err_clk_disable:
+ clk_disable_unprepare(i2s->clk_sys);
+
+ return ret;
+}
+
+static int img_i2s_in_dev_remove(struct platform_device *pdev)
+{
+ struct img_i2s_in *i2s = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(i2s->clk_sys);
+
+ return 0;
+}
+
+static const struct of_device_id img_i2s_in_of_match[] = {
+ { .compatible = "img,i2s-in" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, img_i2s_in_of_match);
+
+static struct platform_driver img_i2s_in_driver = {
+ .driver = {
+ .name = "img-i2s-in",
+ .of_match_table = img_i2s_in_of_match
+ },
+ .probe = img_i2s_in_probe,
+ .remove = img_i2s_in_dev_remove
+};
+module_platform_driver(img_i2s_in_driver);
+
+MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
+MODULE_DESCRIPTION("IMG I2S Input Driver");
+MODULE_LICENSE("GPL v2");
projects / karo-tx-linux.git / commitdiff