/* * IMG I2S output controller driver * * Copyright (C) 2015 Imagination Technologies Ltd. * * Author: Damien Horsley * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #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 "); MODULE_DESCRIPTION("IMG I2S Output Driver"); MODULE_LICENSE("GPL v2"); t.cgi/linux/net-next.git/plain/include/linux/amigaffs.h?id=1214628cb1868254e107230c9052f28ff9899b6a'>plain -rw-r--r--anon_inodes.h455logplain -rw-r--r--apm-emulation.h1575logplain -rw-r--r--apm_bios.h2746logplain 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