diff options
Diffstat (limited to 'sound/soc/img/img-i2s-out.c')
| -rw-r--r-- | sound/soc/img/img-i2s-out.c | 565 |
1 files changed, 565 insertions, 0 deletions
diff --git a/sound/soc/img/img-i2s-out.c b/sound/soc/img/img-i2s-out.c new file mode 100644 index 000000000000..5f997135a8ae --- /dev/null +++ b/sound/soc/img/img-i2s-out.c @@ -0,0 +1,565 @@ +/* + * IMG I2S output 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/pm_runtime.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_OUT_TX_FIFO 0x0 + +#define IMG_I2S_OUT_CTL 0x4 +#define IMG_I2S_OUT_CTL_DATA_EN_MASK BIT(24) +#define IMG_I2S_OUT_CTL_ACTIVE_CHAN_MASK 0xffe000 +#define IMG_I2S_OUT_CTL_ACTIVE_CHAN_SHIFT 13 +#define IMG_I2S_OUT_CTL_FRM_SIZE_MASK BIT(8) +#define IMG_I2S_OUT_CTL_MASTER_MASK BIT(6) +#define IMG_I2S_OUT_CTL_CLK_MASK BIT(5) +#define IMG_I2S_OUT_CTL_CLK_EN_MASK BIT(4) +#define IMG_I2S_OUT_CTL_FRM_CLK_POL_MASK BIT(3) +#define IMG_I2S_OUT_CTL_BCLK_POL_MASK BIT(2) +#define IMG_I2S_OUT_CTL_ME_MASK BIT(0) + +#define IMG_I2S_OUT_CH_CTL 0x4 +#define IMG_I2S_OUT_CHAN_CTL_CH_MASK BIT(11) +#define IMG_I2S_OUT_CHAN_CTL_LT_MASK BIT(10) +#define IMG_I2S_OUT_CHAN_CTL_FMT_MASK 0xf0 +#define IMG_I2S_OUT_CHAN_CTL_FMT_SHIFT 4 +#define IMG_I2S_OUT_CHAN_CTL_JUST_MASK BIT(3) +#define IMG_I2S_OUT_CHAN_CTL_CLKT_MASK BIT(1) +#define IMG_I2S_OUT_CHAN_CTL_ME_MASK BIT(0) + +#define IMG_I2S_OUT_CH_STRIDE 0x20 + +struct img_i2s_out { + void __iomem *base; + struct clk *clk_sys; + struct clk *clk_ref; + struct snd_dmaengine_dai_dma_data dma_data; + struct device *dev; + unsigned int max_i2s_chan; + void __iomem *channel_base; + bool force_clk_active; + unsigned int active_channels; + struct reset_control *rst; + struct snd_soc_dai_driver dai_driver; +}; + +static int img_i2s_out_suspend(struct device *dev) +{ + struct img_i2s_out *i2s = dev_get_drvdata(dev); + + if (!i2s->force_clk_active) + clk_disable_unprepare(i2s->clk_ref); + + return 0; +} + +static int img_i2s_out_resume(struct device *dev) +{ + struct img_i2s_out *i2s = dev_get_drvdata(dev); + int ret; + + if (!i2s->force_clk_active) { + ret = clk_prepare_enable(i2s->clk_ref); + if (ret) { + dev_err(dev, "clk_enable failed: %d\n", ret); + return ret; + } + } + + return 0; +} + +static inline void img_i2s_out_writel(struct img_i2s_out *i2s, u32 val, + u32 reg) +{ + writel(val, i2s->base + reg); +} + +static inline u32 img_i2s_out_readl(struct img_i2s_out *i2s, u32 reg) +{ + return readl(i2s->base + reg); +} + +static inline void img_i2s_out_ch_writel(struct img_i2s_out *i2s, + u32 chan, u32 val, u32 reg) +{ + writel(val, i2s->channel_base + (chan * IMG_I2S_OUT_CH_STRIDE) + reg); +} + +static inline u32 img_i2s_out_ch_readl(struct img_i2s_out *i2s, u32 chan, + u32 reg) +{ + return readl(i2s->channel_base + (chan * IMG_I2S_OUT_CH_STRIDE) + reg); +} + +static inline void img_i2s_out_ch_disable(struct img_i2s_out *i2s, u32 chan) +{ + u32 reg; + + reg = img_i2s_out_ch_readl(i2s, chan, IMG_I2S_OUT_CH_CTL); + reg &= ~IMG_I2S_OUT_CHAN_CTL_ME_MASK; + img_i2s_out_ch_writel(i2s, chan, reg, IMG_I2S_OUT_CH_CTL); +} + +static inline void img_i2s_out_ch_enable(struct img_i2s_out *i2s, u32 chan) +{ + u32 reg; + + reg = img_i2s_out_ch_readl(i2s, chan, IMG_I2S_OUT_CH_CTL); + reg |= IMG_I2S_OUT_CHAN_CTL_ME_MASK; + img_i2s_out_ch_writel(i2s, chan, reg, IMG_I2S_OUT_CH_CTL); +} + +static inline void img_i2s_out_disable(struct img_i2s_out *i2s) +{ + u32 reg; + + reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL); + reg &= ~IMG_I2S_OUT_CTL_ME_MASK; + img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL); +} + +static inline void img_i2s_out_enable(struct img_i2s_out *i2s) +{ + u32 reg; + + reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL); + reg |= IMG_I2S_OUT_CTL_ME_MASK; + img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL); +} + +static void img_i2s_out_reset(struct img_i2s_out *i2s) +{ + int i; + u32 core_ctl, chan_ctl; + + core_ctl = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL) & + ~IMG_I2S_OUT_CTL_ME_MASK & + ~IMG_I2S_OUT_CTL_DATA_EN_MASK; + + if (!i2s->force_clk_active) + core_ctl &= ~IMG_I2S_OUT_CTL_CLK_EN_MASK; + + chan_ctl = img_i2s_out_ch_readl(i2s, 0, IMG_I2S_OUT_CH_CTL) & + ~IMG_I2S_OUT_CHAN_CTL_ME_MASK; + + reset_control_assert(i2s->rst); + reset_control_deassert(i2s->rst); + + for (i = 0; i < i2s->max_i2s_chan; i++) + img_i2s_out_ch_writel(i2s, i, chan_ctl, IMG_I2S_OUT_CH_CTL); + + for (i = 0; i < i2s->active_channels; i++) + img_i2s_out_ch_enable(i2s, i); + + img_i2s_out_writel(i2s, core_ctl, IMG_I2S_OUT_CTL); + img_i2s_out_enable(i2s); +} + +static int img_i2s_out_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *dai) +{ + struct img_i2s_out *i2s = snd_soc_dai_get_drvdata(dai); + u32 reg; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL); + if (!i2s->force_clk_active) + reg |= IMG_I2S_OUT_CTL_CLK_EN_MASK; + reg |= IMG_I2S_OUT_CTL_DATA_EN_MASK; + img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL); + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + img_i2s_out_reset(i2s); + break; + default: + return -EINVAL; + } + + return 0; +} + +static int img_i2s_out_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) +{ + struct img_i2s_out *i2s = snd_soc_dai_get_drvdata(dai); + unsigned int channels, i2s_channels; + long pre_div_a, pre_div_b, diff_a, diff_b, rate, clk_rate; + int i; + u32 reg, control_mask, control_set = 0; + snd_pcm_format_t format; + + rate = params_rate(params); + format = params_format(params); + channels = params_channels(params); + i2s_channels = channels / 2; + + if (format != SNDRV_PCM_FORMAT_S32_LE) + return -EINVAL; + + if ((channels < 2) || + (channels > (i2s->max_i2s_chan * 2)) || + (channels % 2)) + return -EINVAL; + + pre_div_a = clk_round_rate(i2s->clk_ref, rate * 256); + if (pre_div_a < 0) + return pre_div_a; + pre_div_b = clk_round_rate(i2s->clk_ref, rate * 384); + if (pre_div_b < 0) + return pre_div_b; + + diff_a = abs((pre_div_a / 256) - rate); + diff_b = abs((pre_div_b / 384) - rate); + + /* If diffs are equal, use lower clock rate */ + if (diff_a > diff_b) + clk_set_rate(i2s->clk_ref, pre_div_b); + else + clk_set_rate(i2s->clk_ref, pre_div_a); + + /* + * Another driver (eg alsa machine driver) may have rejected the above + * change. Get the current rate and set the register bit according to + * the new minimum diff + */ + clk_rate = clk_get_rate(i2s->clk_ref); + + diff_a = abs((clk_rate / 256) - rate); + diff_b = abs((clk_rate / 384) - rate); + + if (diff_a > diff_b) + control_set |= IMG_I2S_OUT_CTL_CLK_MASK; + + control_set |= ((i2s_channels - 1) << + IMG_I2S_OUT_CTL_ACTIVE_CHAN_SHIFT) & + IMG_I2S_OUT_CTL_ACTIVE_CHAN_MASK; + + control_mask = IMG_I2S_OUT_CTL_CLK_MASK | + IMG_I2S_OUT_CTL_ACTIVE_CHAN_MASK; + + img_i2s_out_disable(i2s); + + reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL); + reg = (reg & ~control_mask) | control_set; + img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL); + + for (i = 0; i < i2s_channels; i++) + img_i2s_out_ch_enable(i2s, i); + + for (; i < i2s->max_i2s_chan; i++) + img_i2s_out_ch_disable(i2s, i); + + img_i2s_out_enable(i2s); + + i2s->active_channels = i2s_channels; + + return 0; +} + +static int img_i2s_out_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) +{ + struct img_i2s_out *i2s = snd_soc_dai_get_drvdata(dai); + int i; + bool force_clk_active; + u32 chan_control_mask, control_mask, chan_control_set = 0; + u32 reg, control_set = 0; + + force_clk_active = ((fmt & SND_SOC_DAIFMT_CLOCK_MASK) == + SND_SOC_DAIFMT_CONT); + + if (force_clk_active) + control_set |= IMG_I2S_OUT_CTL_CLK_EN_MASK; + + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBM_CFM: + break; + case SND_SOC_DAIFMT_CBS_CFS: + control_set |= IMG_I2S_OUT_CTL_MASTER_MASK; + break; + default: + return -EINVAL; + } + + switch (fmt & SND_SOC_DAIFMT_INV_MASK) { + case SND_SOC_DAIFMT_NB_NF: + control_set |= IMG_I2S_OUT_CTL_BCLK_POL_MASK; + break; + case SND_SOC_DAIFMT_NB_IF: + control_set |= IMG_I2S_OUT_CTL_BCLK_POL_MASK; + control_set |= IMG_I2S_OUT_CTL_FRM_CLK_POL_MASK; + break; + case SND_SOC_DAIFMT_IB_NF: + break; + case SND_SOC_DAIFMT_IB_IF: + control_set |= IMG_I2S_OUT_CTL_FRM_CLK_POL_MASK; + break; + default: + return -EINVAL; + } + + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + chan_control_set |= IMG_I2S_OUT_CHAN_CTL_CLKT_MASK; + break; + case SND_SOC_DAIFMT_LEFT_J: + break; + default: + return -EINVAL; + } + + control_mask = IMG_I2S_OUT_CTL_CLK_EN_MASK | + IMG_I2S_OUT_CTL_MASTER_MASK | + IMG_I2S_OUT_CTL_BCLK_POL_MASK | + IMG_I2S_OUT_CTL_FRM_CLK_POL_MASK; + + chan_control_mask = IMG_I2S_OUT_CHAN_CTL_CLKT_MASK; + + img_i2s_out_disable(i2s); + + reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL); + reg = (reg & ~control_mask) | control_set; + img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL); + + for (i = 0; i < i2s->active_channels; i++) + img_i2s_out_ch_disable(i2s, i); + + for (i = 0; i < i2s->max_i2s_chan; i++) { + reg = img_i2s_out_ch_readl(i2s, i, IMG_I2S_OUT_CH_CTL); + reg = (reg & ~chan_control_mask) | chan_control_set; + img_i2s_out_ch_writel(i2s, i, reg, IMG_I2S_OUT_CH_CTL); + } + + for (i = 0; i < i2s->active_channels; i++) + img_i2s_out_ch_enable(i2s, i); + + img_i2s_out_enable(i2s); + + i2s->force_clk_active = force_clk_active; + + return 0; +} + +static const struct snd_soc_dai_ops img_i2s_out_dai_ops = { + .trigger = img_i2s_out_trigger, + .hw_params = img_i2s_out_hw_params, + .set_fmt = img_i2s_out_set_fmt +}; + +static int img_i2s_out_dai_probe(struct snd_soc_dai *dai) +{ + struct img_i2s_out *i2s = snd_soc_dai_get_drvdata(dai); + + snd_soc_dai_init_dma_data(dai, &i2s->dma_data, NULL); + + return 0; +} + +static const struct snd_soc_component_driver img_i2s_out_component = { + .name = "img-i2s-out" +}; + +static int img_i2s_out_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->dst_addr = dma_data->addr; + sc->dst_addr_width = dma_data->addr_width; + sc->dst_maxburst = 4 * i2s_channels; + + return 0; +} + +static const struct snd_dmaengine_pcm_config img_i2s_out_dma_config = { + .prepare_slave_config = img_i2s_out_dma_prepare_slave_config +}; + +static int img_i2s_out_probe(struct platform_device *pdev) +{ + struct img_i2s_out *i2s; + struct resource *res; + void __iomem *base; + int i, ret; + unsigned int max_i2s_chan_pow_2; + u32 reg; + struct device *dev = &pdev->dev; + + i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL); + if (!i2s) + return -ENOMEM; + + platform_set_drvdata(pdev, i2s); + + i2s->dev = &pdev->dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->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(&pdev->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->rst = devm_reset_control_get(&pdev->dev, "rst"); + if (IS_ERR(i2s->rst)) { + if (PTR_ERR(i2s->rst) != -EPROBE_DEFER) + dev_err(&pdev->dev, "No top level reset found\n"); + return PTR_ERR(i2s->rst); + } + + i2s->clk_sys = devm_clk_get(&pdev->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); + } + + i2s->clk_ref = devm_clk_get(&pdev->dev, "ref"); + if (IS_ERR(i2s->clk_ref)) { + if (PTR_ERR(i2s->clk_ref) != -EPROBE_DEFER) + dev_err(dev, "Failed to acquire clock 'ref'\n"); + return PTR_ERR(i2s->clk_ref); + } + + ret = clk_prepare_enable(i2s->clk_sys); + if (ret) + return ret; + + reg = IMG_I2S_OUT_CTL_FRM_SIZE_MASK; + img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL); + + reg = IMG_I2S_OUT_CHAN_CTL_JUST_MASK | + IMG_I2S_OUT_CHAN_CTL_LT_MASK | + IMG_I2S_OUT_CHAN_CTL_CH_MASK | + (8 << IMG_I2S_OUT_CHAN_CTL_FMT_SHIFT); + + for (i = 0; i < i2s->max_i2s_chan; i++) + img_i2s_out_ch_writel(i2s, i, reg, IMG_I2S_OUT_CH_CTL); + + img_i2s_out_reset(i2s); + + pm_runtime_enable(&pdev->dev); + if (!pm_runtime_enabled(&pdev->dev)) { + ret = img_i2s_out_resume(&pdev->dev); + if (ret) + goto err_pm_disable; + } + + i2s->active_channels = 1; + i2s->dma_data.addr = res->start + IMG_I2S_OUT_TX_FIFO; + i2s->dma_data.addr_width = 4; + i2s->dma_data.maxburst = 4; + + i2s->dai_driver.probe = img_i2s_out_dai_probe; + i2s->dai_driver.playback.channels_min = 2; + i2s->dai_driver.playback.channels_max = i2s->max_i2s_chan * 2; + i2s->dai_driver.playback.rates = SNDRV_PCM_RATE_8000_192000; + i2s->dai_driver.playback.formats = SNDRV_PCM_FMTBIT_S32_LE; + i2s->dai_driver.ops = &img_i2s_out_dai_ops; + + ret = devm_snd_soc_register_component(&pdev->dev, + &img_i2s_out_component, &i2s->dai_driver, 1); + if (ret) + goto err_suspend; + + ret = devm_snd_dmaengine_pcm_register(&pdev->dev, + &img_i2s_out_dma_config, 0); + if (ret) + goto err_suspend; + + return 0; + +err_suspend: + if (!pm_runtime_status_suspended(&pdev->dev)) + img_i2s_out_suspend(&pdev->dev); +err_pm_disable: + pm_runtime_disable(&pdev->dev); + clk_disable_unprepare(i2s->clk_sys); + + return ret; +} + +static int img_i2s_out_dev_remove(struct platform_device *pdev) +{ + struct img_i2s_out *i2s = platform_get_drvdata(pdev); + + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + img_i2s_out_suspend(&pdev->dev); + + clk_disable_unprepare(i2s->clk_sys); + + return 0; +} + +static const struct of_device_id img_i2s_out_of_match[] = { + { .compatible = "img,i2s-out" }, + {} +}; +MODULE_DEVICE_TABLE(of, img_i2s_out_of_match); + +static const struct dev_pm_ops img_i2s_out_pm_ops = { + SET_RUNTIME_PM_OPS(img_i2s_out_suspend, + img_i2s_out_resume, NULL) +}; + +static struct platform_driver img_i2s_out_driver = { + .driver = { + .name = "img-i2s-out", + .of_match_table = img_i2s_out_of_match, + .pm = &img_i2s_out_pm_ops + }, + .probe = img_i2s_out_probe, + .remove = img_i2s_out_dev_remove +}; +module_platform_driver(img_i2s_out_driver); + +MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>"); +MODULE_DESCRIPTION("IMG I2S Output Driver"); +MODULE_LICENSE("GPL v2"); |