ASoC: tegra: add ac97 host driver
This adds the driver for the Tegra 2x AC97 host controller.
Signed-off-by: Lucas Stach <dev@lynxeye.de>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/tegra/tegra20_ac97.c b/sound/soc/tegra/tegra20_ac97.c
new file mode 100644
index 0000000..1bae73b
--- /dev/null
+++ b/sound/soc/tegra/tegra20_ac97.c
@@ -0,0 +1,480 @@
+/*
+ * tegra20_ac97.c - Tegra20 AC97 platform driver
+ *
+ * Copyright (c) 2012 Lucas Stach <dev@lynxeye.de>
+ *
+ * Partly based on code copyright/by:
+ *
+ * Copyright (c) 2011,2012 Toradex Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "tegra_asoc_utils.h"
+#include "tegra20_ac97.h"
+
+#define DRV_NAME "tegra20-ac97"
+
+static struct tegra20_ac97 *workdata;
+
+static void tegra20_ac97_codec_reset(struct snd_ac97 *ac97)
+{
+ u32 readback;
+ unsigned long timeout;
+
+ /* reset line is not driven by DAC pad group, have to toggle GPIO */
+ gpio_set_value(workdata->reset_gpio, 0);
+ udelay(2);
+
+ gpio_set_value(workdata->reset_gpio, 1);
+ udelay(2);
+
+ timeout = jiffies + msecs_to_jiffies(100);
+
+ do {
+ regmap_read(workdata->regmap, TEGRA20_AC97_STATUS1, &readback);
+ if (readback & TEGRA20_AC97_STATUS1_CODEC1_RDY)
+ break;
+ usleep_range(1000, 2000);
+ } while (!time_after(jiffies, timeout));
+}
+
+static void tegra20_ac97_codec_warm_reset(struct snd_ac97 *ac97)
+{
+ u32 readback;
+ unsigned long timeout;
+
+ /*
+ * although sync line is driven by the DAC pad group warm reset using
+ * the controller cmd is not working, have to toggle sync line
+ * manually.
+ */
+ gpio_request(workdata->sync_gpio, "codec-sync");
+
+ gpio_direction_output(workdata->sync_gpio, 1);
+
+ udelay(2);
+ gpio_set_value(workdata->sync_gpio, 0);
+ udelay(2);
+ gpio_free(workdata->sync_gpio);
+
+ timeout = jiffies + msecs_to_jiffies(100);
+
+ do {
+ regmap_read(workdata->regmap, TEGRA20_AC97_STATUS1, &readback);
+ if (readback & TEGRA20_AC97_STATUS1_CODEC1_RDY)
+ break;
+ usleep_range(1000, 2000);
+ } while (!time_after(jiffies, timeout));
+}
+
+static unsigned short tegra20_ac97_codec_read(struct snd_ac97 *ac97_snd,
+ unsigned short reg)
+{
+ u32 readback;
+ unsigned long timeout;
+
+ regmap_write(workdata->regmap, TEGRA20_AC97_CMD,
+ (((reg | 0x80) << TEGRA20_AC97_CMD_CMD_ADDR_SHIFT) &
+ TEGRA20_AC97_CMD_CMD_ADDR_MASK) |
+ TEGRA20_AC97_CMD_BUSY);
+
+ timeout = jiffies + msecs_to_jiffies(100);
+
+ do {
+ regmap_read(workdata->regmap, TEGRA20_AC97_STATUS1, &readback);
+ if (readback & TEGRA20_AC97_STATUS1_STA_VALID1)
+ break;
+ usleep_range(1000, 2000);
+ } while (!time_after(jiffies, timeout));
+
+ return ((readback & TEGRA20_AC97_STATUS1_STA_DATA1_MASK) >>
+ TEGRA20_AC97_STATUS1_STA_DATA1_SHIFT);
+}
+
+static void tegra20_ac97_codec_write(struct snd_ac97 *ac97_snd,
+ unsigned short reg, unsigned short val)
+{
+ u32 readback;
+ unsigned long timeout;
+
+ regmap_write(workdata->regmap, TEGRA20_AC97_CMD,
+ ((reg << TEGRA20_AC97_CMD_CMD_ADDR_SHIFT) &
+ TEGRA20_AC97_CMD_CMD_ADDR_MASK) |
+ ((val << TEGRA20_AC97_CMD_CMD_DATA_SHIFT) &
+ TEGRA20_AC97_CMD_CMD_DATA_MASK) |
+ TEGRA20_AC97_CMD_BUSY);
+
+ timeout = jiffies + msecs_to_jiffies(100);
+
+ do {
+ regmap_read(workdata->regmap, TEGRA20_AC97_CMD, &readback);
+ if (!(readback & TEGRA20_AC97_CMD_BUSY))
+ break;
+ usleep_range(1000, 2000);
+ } while (!time_after(jiffies, timeout));
+}
+
+struct snd_ac97_bus_ops soc_ac97_ops = {
+ .read = tegra20_ac97_codec_read,
+ .write = tegra20_ac97_codec_write,
+ .reset = tegra20_ac97_codec_reset,
+ .warm_reset = tegra20_ac97_codec_warm_reset,
+};
+EXPORT_SYMBOL_GPL(soc_ac97_ops);
+
+static inline void tegra20_ac97_start_playback(struct tegra20_ac97 *ac97)
+{
+ regmap_update_bits(ac97->regmap, TEGRA20_AC97_FIFO1_SCR,
+ TEGRA20_AC97_FIFO_SCR_PB_QRT_MT_EN,
+ TEGRA20_AC97_FIFO_SCR_PB_QRT_MT_EN);
+
+ regmap_update_bits(ac97->regmap, TEGRA20_AC97_CTRL,
+ TEGRA20_AC97_CTRL_PCM_DAC_EN |
+ TEGRA20_AC97_CTRL_STM_EN,
+ TEGRA20_AC97_CTRL_PCM_DAC_EN |
+ TEGRA20_AC97_CTRL_STM_EN);
+}
+
+static inline void tegra20_ac97_stop_playback(struct tegra20_ac97 *ac97)
+{
+ regmap_update_bits(ac97->regmap, TEGRA20_AC97_FIFO1_SCR,
+ TEGRA20_AC97_FIFO_SCR_PB_QRT_MT_EN, 0);
+
+ regmap_update_bits(ac97->regmap, TEGRA20_AC97_CTRL,
+ TEGRA20_AC97_CTRL_PCM_DAC_EN, 0);
+}
+
+static inline void tegra20_ac97_start_capture(struct tegra20_ac97 *ac97)
+{
+ regmap_update_bits(ac97->regmap, TEGRA20_AC97_FIFO1_SCR,
+ TEGRA20_AC97_FIFO_SCR_REC_FULL_EN,
+ TEGRA20_AC97_FIFO_SCR_REC_FULL_EN);
+}
+
+static inline void tegra20_ac97_stop_capture(struct tegra20_ac97 *ac97)
+{
+ regmap_update_bits(ac97->regmap, TEGRA20_AC97_FIFO1_SCR,
+ TEGRA20_AC97_FIFO_SCR_REC_FULL_EN, 0);
+}
+
+static int tegra20_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct tegra20_ac97 *ac97 = snd_soc_dai_get_drvdata(dai);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ tegra20_ac97_start_playback(ac97);
+ else
+ tegra20_ac97_start_capture(ac97);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ tegra20_ac97_stop_playback(ac97);
+ else
+ tegra20_ac97_stop_capture(ac97);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops tegra20_ac97_dai_ops = {
+ .trigger = tegra20_ac97_trigger,
+};
+
+static int tegra20_ac97_probe(struct snd_soc_dai *dai)
+{
+ struct tegra20_ac97 *ac97 = snd_soc_dai_get_drvdata(dai);
+
+ dai->capture_dma_data = &ac97->capture_dma_data;
+ dai->playback_dma_data = &ac97->playback_dma_data;
+
+ return 0;
+}
+
+static struct snd_soc_dai_driver tegra20_ac97_dai = {
+ .name = "tegra-ac97-pcm",
+ .ac97_control = 1,
+ .probe = tegra20_ac97_probe,
+ .playback = {
+ .stream_name = "PCM Playback",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .capture = {
+ .stream_name = "PCM Capture",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .ops = &tegra20_ac97_dai_ops,
+};
+
+static bool tegra20_ac97_wr_rd_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case TEGRA20_AC97_CTRL:
+ case TEGRA20_AC97_CMD:
+ case TEGRA20_AC97_STATUS1:
+ case TEGRA20_AC97_FIFO1_SCR:
+ case TEGRA20_AC97_FIFO_TX1:
+ case TEGRA20_AC97_FIFO_RX1:
+ return true;
+ default:
+ break;
+ }
+
+ return false;
+}
+
+static bool tegra20_ac97_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case TEGRA20_AC97_STATUS1:
+ case TEGRA20_AC97_FIFO1_SCR:
+ case TEGRA20_AC97_FIFO_TX1:
+ case TEGRA20_AC97_FIFO_RX1:
+ return true;
+ default:
+ break;
+ }
+
+ return false;
+}
+
+static bool tegra20_ac97_precious_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case TEGRA20_AC97_FIFO_TX1:
+ case TEGRA20_AC97_FIFO_RX1:
+ return true;
+ default:
+ break;
+ }
+
+ return false;
+}
+
+static const struct regmap_config tegra20_ac97_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = TEGRA20_AC97_FIFO_RX1,
+ .writeable_reg = tegra20_ac97_wr_rd_reg,
+ .readable_reg = tegra20_ac97_wr_rd_reg,
+ .volatile_reg = tegra20_ac97_volatile_reg,
+ .precious_reg = tegra20_ac97_precious_reg,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static int tegra20_ac97_platform_probe(struct platform_device *pdev)
+{
+ struct tegra20_ac97 *ac97;
+ struct resource *mem, *memregion;
+ u32 of_dma[2];
+ void __iomem *regs;
+ int ret = 0;
+
+ ac97 = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_ac97),
+ GFP_KERNEL);
+ if (!ac97) {
+ dev_err(&pdev->dev, "Can't allocate tegra20_ac97\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+ dev_set_drvdata(&pdev->dev, ac97);
+
+ ac97->clk_ac97 = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(ac97->clk_ac97)) {
+ dev_err(&pdev->dev, "Can't retrieve ac97 clock\n");
+ ret = PTR_ERR(ac97->clk_ac97);
+ goto err;
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem) {
+ dev_err(&pdev->dev, "No memory resource\n");
+ ret = -ENODEV;
+ goto err_clk_put;
+ }
+
+ memregion = devm_request_mem_region(&pdev->dev, mem->start,
+ resource_size(mem), DRV_NAME);
+ if (!memregion) {
+ dev_err(&pdev->dev, "Memory region already claimed\n");
+ ret = -EBUSY;
+ goto err_clk_put;
+ }
+
+ regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
+ if (!regs) {
+ dev_err(&pdev->dev, "ioremap failed\n");
+ ret = -ENOMEM;
+ goto err_clk_put;
+ }
+
+ ac97->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+ &tegra20_ac97_regmap_config);
+ if (IS_ERR(ac97->regmap)) {
+ dev_err(&pdev->dev, "regmap init failed\n");
+ ret = PTR_ERR(ac97->regmap);
+ goto err_clk_put;
+ }
+
+ if (of_property_read_u32_array(pdev->dev.of_node,
+ "nvidia,dma-request-selector",
+ of_dma, 2) < 0) {
+ dev_err(&pdev->dev, "No DMA resource\n");
+ ret = -ENODEV;
+ goto err_clk_put;
+ }
+
+ ac97->reset_gpio = of_get_named_gpio(pdev->dev.of_node,
+ "nvidia,codec-reset-gpio", 0);
+ if (gpio_is_valid(ac97->reset_gpio)) {
+ ret = devm_gpio_request_one(&pdev->dev, ac97->reset_gpio,
+ GPIOF_OUT_INIT_HIGH, "codec-reset");
+ if (ret) {
+ dev_err(&pdev->dev, "could not get codec-reset GPIO\n");
+ goto err_clk_put;
+ }
+ } else {
+ dev_err(&pdev->dev, "no codec-reset GPIO supplied\n");
+ goto err_clk_put;
+ }
+
+ ac97->sync_gpio = of_get_named_gpio(pdev->dev.of_node,
+ "nvidia,codec-sync-gpio", 0);
+ if (!gpio_is_valid(ac97->sync_gpio)) {
+ dev_err(&pdev->dev, "no codec-sync GPIO supplied\n");
+ goto err_clk_put;
+ }
+
+ ac97->capture_dma_data.addr = mem->start + TEGRA20_AC97_FIFO_RX1;
+ ac97->capture_dma_data.wrap = 4;
+ ac97->capture_dma_data.width = 32;
+ ac97->capture_dma_data.req_sel = of_dma[1];
+
+ ac97->playback_dma_data.addr = mem->start + TEGRA20_AC97_FIFO_TX1;
+ ac97->playback_dma_data.wrap = 4;
+ ac97->playback_dma_data.width = 32;
+ ac97->playback_dma_data.req_sel = of_dma[1];
+
+ ret = snd_soc_register_dais(&pdev->dev, &tegra20_ac97_dai, 1);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
+ ret = -ENOMEM;
+ goto err_clk_put;
+ }
+
+ ret = tegra_pcm_platform_register(&pdev->dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
+ goto err_unregister_dai;
+ }
+
+ ret = tegra_asoc_utils_init(&ac97->util_data, &pdev->dev);
+ if (ret)
+ goto err_unregister_pcm;
+
+ ret = tegra_asoc_utils_set_ac97_rate(&ac97->util_data);
+ if (ret)
+ goto err_asoc_utils_fini;
+
+ ret = clk_prepare_enable(ac97->clk_ac97);
+ if (ret) {
+ dev_err(&pdev->dev, "clk_enable failed: %d\n", ret);
+ goto err_asoc_utils_fini;
+ }
+
+ /* XXX: crufty ASoC AC97 API - only one AC97 codec allowed */
+ workdata = ac97;
+
+ return 0;
+
+err_asoc_utils_fini:
+ tegra_asoc_utils_fini(&ac97->util_data);
+err_unregister_pcm:
+ tegra_pcm_platform_unregister(&pdev->dev);
+err_unregister_dai:
+ snd_soc_unregister_dai(&pdev->dev);
+err_clk_put:
+ clk_put(ac97->clk_ac97);
+err:
+ return ret;
+}
+
+static int tegra20_ac97_platform_remove(struct platform_device *pdev)
+{
+ struct tegra20_ac97 *ac97 = dev_get_drvdata(&pdev->dev);
+
+ tegra_pcm_platform_unregister(&pdev->dev);
+ snd_soc_unregister_dai(&pdev->dev);
+
+ tegra_asoc_utils_fini(&ac97->util_data);
+
+ clk_disable_unprepare(ac97->clk_ac97);
+ clk_put(ac97->clk_ac97);
+
+ return 0;
+}
+
+static const struct of_device_id tegra20_ac97_of_match[] __devinitconst = {
+ { .compatible = "nvidia,tegra20-ac97", },
+ {},
+};
+
+static struct platform_driver tegra20_ac97_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = tegra20_ac97_of_match,
+ },
+ .probe = tegra20_ac97_platform_probe,
+ .remove = tegra20_ac97_platform_remove,
+};
+module_platform_driver(tegra20_ac97_driver);
+
+MODULE_AUTHOR("Lucas Stach");
+MODULE_DESCRIPTION("Tegra20 AC97 ASoC driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_DEVICE_TABLE(of, tegra20_ac97_of_match);
