460 lines
11 KiB
C
460 lines
11 KiB
C
/*
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* tegra_i2s.c - Tegra I2S driver
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*
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* Author: Stephen Warren <swarren@nvidia.com>
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* Copyright (C) 2010 - NVIDIA, Inc.
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*
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* Based on code copyright/by:
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*
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* Copyright (c) 2009-2010, NVIDIA Corporation.
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* Scott Peterson <speterson@nvidia.com>
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*
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* Copyright (C) 2010 Google, Inc.
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* Iliyan Malchev <malchev@google.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <mach/iomap.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include "tegra_i2s.h"
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#define DRV_NAME "tegra-i2s"
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static inline void tegra_i2s_write(struct tegra_i2s *i2s, u32 reg, u32 val)
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{
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__raw_writel(val, i2s->regs + reg);
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}
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static inline u32 tegra_i2s_read(struct tegra_i2s *i2s, u32 reg)
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{
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return __raw_readl(i2s->regs + reg);
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}
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#ifdef CONFIG_DEBUG_FS
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static int tegra_i2s_show(struct seq_file *s, void *unused)
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{
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#define REG(r) { r, #r }
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static const struct {
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int offset;
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const char *name;
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} regs[] = {
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REG(TEGRA_I2S_CTRL),
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REG(TEGRA_I2S_STATUS),
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REG(TEGRA_I2S_TIMING),
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REG(TEGRA_I2S_FIFO_SCR),
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REG(TEGRA_I2S_PCM_CTRL),
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REG(TEGRA_I2S_NW_CTRL),
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REG(TEGRA_I2S_TDM_CTRL),
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REG(TEGRA_I2S_TDM_TX_RX_CTRL),
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};
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#undef REG
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struct tegra_i2s *i2s = s->private;
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int i;
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clk_enable(i2s->clk_i2s);
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for (i = 0; i < ARRAY_SIZE(regs); i++) {
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u32 val = tegra_i2s_read(i2s, regs[i].offset);
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seq_printf(s, "%s = %08x\n", regs[i].name, val);
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}
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clk_disable(i2s->clk_i2s);
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return 0;
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}
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static int tegra_i2s_debug_open(struct inode *inode, struct file *file)
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{
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return single_open(file, tegra_i2s_show, inode->i_private);
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}
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static const struct file_operations tegra_i2s_debug_fops = {
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.open = tegra_i2s_debug_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void tegra_i2s_debug_add(struct tegra_i2s *i2s)
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{
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i2s->debug = debugfs_create_file(i2s->dai.name, S_IRUGO,
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snd_soc_debugfs_root, i2s,
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&tegra_i2s_debug_fops);
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}
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static void tegra_i2s_debug_remove(struct tegra_i2s *i2s)
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{
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if (i2s->debug)
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debugfs_remove(i2s->debug);
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}
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#else
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static inline void tegra_i2s_debug_add(struct tegra_i2s *i2s)
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{
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}
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static inline void tegra_i2s_debug_remove(struct tegra_i2s *i2s)
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{
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}
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#endif
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static int tegra_i2s_set_fmt(struct snd_soc_dai *dai,
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unsigned int fmt)
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{
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struct tegra_i2s *i2s = snd_soc_dai_get_drvdata(dai);
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switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
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case SND_SOC_DAIFMT_NB_NF:
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break;
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default:
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return -EINVAL;
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}
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i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_MASTER_ENABLE;
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switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
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case SND_SOC_DAIFMT_CBS_CFS:
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_MASTER_ENABLE;
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break;
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case SND_SOC_DAIFMT_CBM_CFM:
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break;
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default:
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return -EINVAL;
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}
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i2s->reg_ctrl &= ~(TEGRA_I2S_CTRL_BIT_FORMAT_MASK |
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TEGRA_I2S_CTRL_LRCK_MASK);
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switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_DSP_A:
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_DSP;
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
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break;
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case SND_SOC_DAIFMT_DSP_B:
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_DSP;
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_R_LOW;
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break;
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case SND_SOC_DAIFMT_I2S:
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_I2S;
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
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break;
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case SND_SOC_DAIFMT_RIGHT_J:
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_RJM;
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
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break;
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case SND_SOC_DAIFMT_LEFT_J:
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_LJM;
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int tegra_i2s_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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{
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struct device *dev = substream->pcm->card->dev;
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struct tegra_i2s *i2s = snd_soc_dai_get_drvdata(dai);
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u32 reg;
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int ret, sample_size, srate, i2sclock, bitcnt;
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i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_BIT_SIZE_MASK;
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S16_LE:
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_SIZE_16;
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sample_size = 16;
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break;
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case SNDRV_PCM_FORMAT_S24_LE:
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_SIZE_24;
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sample_size = 24;
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break;
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case SNDRV_PCM_FORMAT_S32_LE:
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_SIZE_32;
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sample_size = 32;
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break;
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default:
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return -EINVAL;
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}
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srate = params_rate(params);
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/* Final "* 2" required by Tegra hardware */
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i2sclock = srate * params_channels(params) * sample_size * 2;
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ret = clk_set_rate(i2s->clk_i2s, i2sclock);
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if (ret) {
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dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
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return ret;
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}
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bitcnt = (i2sclock / (2 * srate)) - 1;
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if (bitcnt < 0 || bitcnt > TEGRA_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
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return -EINVAL;
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reg = bitcnt << TEGRA_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
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if (i2sclock % (2 * srate))
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reg |= TEGRA_I2S_TIMING_NON_SYM_ENABLE;
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if (!i2s->clk_refs)
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clk_enable(i2s->clk_i2s);
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tegra_i2s_write(i2s, TEGRA_I2S_TIMING, reg);
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tegra_i2s_write(i2s, TEGRA_I2S_FIFO_SCR,
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TEGRA_I2S_FIFO_SCR_FIFO2_ATN_LVL_FOUR_SLOTS |
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TEGRA_I2S_FIFO_SCR_FIFO1_ATN_LVL_FOUR_SLOTS);
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if (!i2s->clk_refs)
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clk_disable(i2s->clk_i2s);
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return 0;
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}
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static void tegra_i2s_start_playback(struct tegra_i2s *i2s)
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{
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_FIFO1_ENABLE;
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tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
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}
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static void tegra_i2s_stop_playback(struct tegra_i2s *i2s)
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{
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i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_FIFO1_ENABLE;
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tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
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}
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static void tegra_i2s_start_capture(struct tegra_i2s *i2s)
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{
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i2s->reg_ctrl |= TEGRA_I2S_CTRL_FIFO2_ENABLE;
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tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
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}
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static void tegra_i2s_stop_capture(struct tegra_i2s *i2s)
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{
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i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_FIFO2_ENABLE;
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tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
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}
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static int tegra_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
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struct snd_soc_dai *dai)
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{
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struct tegra_i2s *i2s = snd_soc_dai_get_drvdata(dai);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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case SNDRV_PCM_TRIGGER_RESUME:
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if (!i2s->clk_refs)
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clk_enable(i2s->clk_i2s);
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i2s->clk_refs++;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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tegra_i2s_start_playback(i2s);
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else
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tegra_i2s_start_capture(i2s);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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tegra_i2s_stop_playback(i2s);
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else
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tegra_i2s_stop_capture(i2s);
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i2s->clk_refs--;
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if (!i2s->clk_refs)
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clk_disable(i2s->clk_i2s);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int tegra_i2s_probe(struct snd_soc_dai *dai)
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{
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struct tegra_i2s * i2s = snd_soc_dai_get_drvdata(dai);
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dai->capture_dma_data = &i2s->capture_dma_data;
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dai->playback_dma_data = &i2s->playback_dma_data;
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return 0;
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}
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static const struct snd_soc_dai_ops tegra_i2s_dai_ops = {
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.set_fmt = tegra_i2s_set_fmt,
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.hw_params = tegra_i2s_hw_params,
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.trigger = tegra_i2s_trigger,
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};
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static const struct snd_soc_dai_driver tegra_i2s_dai_template = {
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.probe = tegra_i2s_probe,
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.playback = {
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.channels_min = 2,
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.channels_max = 2,
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.rates = SNDRV_PCM_RATE_8000_96000,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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},
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.capture = {
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.channels_min = 2,
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.channels_max = 2,
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.rates = SNDRV_PCM_RATE_8000_96000,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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},
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.ops = &tegra_i2s_dai_ops,
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.symmetric_rates = 1,
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};
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static __devinit int tegra_i2s_platform_probe(struct platform_device *pdev)
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{
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struct tegra_i2s * i2s;
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struct resource *mem, *memregion, *dmareq;
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u32 of_dma[2];
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u32 dma_ch;
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int ret;
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i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra_i2s), GFP_KERNEL);
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if (!i2s) {
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dev_err(&pdev->dev, "Can't allocate tegra_i2s\n");
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ret = -ENOMEM;
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goto err;
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}
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dev_set_drvdata(&pdev->dev, i2s);
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i2s->dai = tegra_i2s_dai_template;
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i2s->dai.name = dev_name(&pdev->dev);
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i2s->clk_i2s = clk_get(&pdev->dev, NULL);
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if (IS_ERR(i2s->clk_i2s)) {
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dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
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ret = PTR_ERR(i2s->clk_i2s);
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goto err;
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}
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem) {
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dev_err(&pdev->dev, "No memory resource\n");
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ret = -ENODEV;
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goto err_clk_put;
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}
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dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
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if (!dmareq) {
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if (of_property_read_u32_array(pdev->dev.of_node,
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"nvidia,dma-request-selector",
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of_dma, 2) < 0) {
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dev_err(&pdev->dev, "No DMA resource\n");
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ret = -ENODEV;
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goto err_clk_put;
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}
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dma_ch = of_dma[1];
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} else {
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dma_ch = dmareq->start;
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}
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memregion = devm_request_mem_region(&pdev->dev, mem->start,
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resource_size(mem), DRV_NAME);
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if (!memregion) {
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dev_err(&pdev->dev, "Memory region already claimed\n");
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ret = -EBUSY;
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goto err_clk_put;
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}
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i2s->regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
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if (!i2s->regs) {
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dev_err(&pdev->dev, "ioremap failed\n");
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ret = -ENOMEM;
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goto err_clk_put;
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}
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i2s->capture_dma_data.addr = mem->start + TEGRA_I2S_FIFO2;
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i2s->capture_dma_data.wrap = 4;
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i2s->capture_dma_data.width = 32;
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i2s->capture_dma_data.req_sel = dma_ch;
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i2s->playback_dma_data.addr = mem->start + TEGRA_I2S_FIFO1;
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i2s->playback_dma_data.wrap = 4;
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i2s->playback_dma_data.width = 32;
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i2s->playback_dma_data.req_sel = dma_ch;
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i2s->reg_ctrl = TEGRA_I2S_CTRL_FIFO_FORMAT_PACKED;
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ret = snd_soc_register_dai(&pdev->dev, &i2s->dai);
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if (ret) {
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dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
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ret = -ENOMEM;
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goto err_clk_put;
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}
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tegra_i2s_debug_add(i2s);
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return 0;
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err_clk_put:
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clk_put(i2s->clk_i2s);
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err:
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return ret;
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}
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static int __devexit tegra_i2s_platform_remove(struct platform_device *pdev)
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{
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struct tegra_i2s *i2s = dev_get_drvdata(&pdev->dev);
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snd_soc_unregister_dai(&pdev->dev);
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tegra_i2s_debug_remove(i2s);
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clk_put(i2s->clk_i2s);
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return 0;
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}
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static const struct of_device_id tegra_i2s_of_match[] __devinitconst = {
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{ .compatible = "nvidia,tegra20-i2s", },
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{},
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};
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static struct platform_driver tegra_i2s_driver = {
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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.of_match_table = tegra_i2s_of_match,
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},
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.probe = tegra_i2s_platform_probe,
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.remove = __devexit_p(tegra_i2s_platform_remove),
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};
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module_platform_driver(tegra_i2s_driver);
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MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
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MODULE_DESCRIPTION("Tegra I2S ASoC driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DRV_NAME);
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MODULE_DEVICE_TABLE(of, tegra_i2s_of_match);
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