LOCAL / ASoC: samsung: Add Samsung Low Power Audio Subsystem driver

This patch adds LPASS driver. The LPASS (Low Power Audio Subsystem)
is a special subsystem that supports audio playback with low power
consumption.

Signed-off-by: Inha Song <ideal.song@samsung.com>

diff --git a/sound/soc/samsung/Kconfig b/sound/soc/samsung/Kconfig
index e0244fe..6fd4c9f 100644 (file)
--- a/sound/soc/samsung/Kconfig
+++ b/sound/soc/samsung/Kconfig
@@ -33,6 +33,9 @@ config SND_SAMSUNG_SPDIF
 config SND_SAMSUNG_I2S
        tristate
 
+config SND_SAMSUNG_AUDSS
+       tristate
+
 config SND_SOC_SAMSUNG_NEO1973_WM8753
        tristate "Audio support for Openmoko Neo1973 Smartphones (GTA02)"
        depends on SND_SOC_SAMSUNG && MACH_NEO1973_GTA02
@@ -241,5 +244,6 @@ config SND_SOC_SAMSUNG_TM2_WM5110
        select SND_SOC_MAX98504A
        select SND_SOC_WM5110
        select SND_SAMSUNG_I2S
+       select SND_SAMSUNG_AUDSS
        help
          Say Y if you want to add support for SoC audio on the TM2 board.

diff --git a/sound/soc/samsung/Makefile b/sound/soc/samsung/Makefile
index c15a759..16ab0d0 100644 (file)
--- a/sound/soc/samsung/Makefile
+++ b/sound/soc/samsung/Makefile
@@ -8,6 +8,7 @@ snd-soc-s3c-i2s-v2-objs := s3c-i2s-v2.o
 snd-soc-samsung-spdif-objs := spdif.o
 snd-soc-pcm-objs := pcm.o
 snd-soc-i2s-objs := i2s.o
+snd-soc-lpass-objs := lpass.o
 
 obj-$(CONFIG_SND_SOC_SAMSUNG) += snd-soc-s3c-dma.o
 obj-$(CONFIG_SND_S3C24XX_I2S) += snd-soc-s3c24xx-i2s.o
@@ -18,6 +19,7 @@ obj-$(CONFIG_SND_SAMSUNG_SPDIF) += snd-soc-samsung-spdif.o
 obj-$(CONFIG_SND_SAMSUNG_PCM) += snd-soc-pcm.o
 obj-$(CONFIG_SND_SAMSUNG_I2S) += snd-soc-i2s.o
 obj-$(CONFIG_SND_SAMSUNG_I2S) += snd-soc-idma.o
+obj-$(CONFIG_SND_SAMSUNG_AUDSS) += snd-soc-lpass.o
 
 # S3C24XX Machine Support
 snd-soc-jive-wm8750-objs := jive_wm8750.o

diff --git a/sound/soc/samsung/lpass.c b/sound/soc/samsung/lpass.c
new file mode 100644 (file)
index 0000000..e93e65a
--- /dev/null
+++ b/sound/soc/samsung/lpass.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2015 Samsung Electronics Co., Ltd.
+ *     Inha Song <ideal.song@samsung.com>
+ *
+ * Low Power Audio SubSystem driver for Samsung Exynos
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <sound/soc.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#include "lpass.h"
+
+#define EXYNOS5433_PAD_RETENTION_AUD_OPTION_OFFSET     0x3028
+#define EXYNOS5433_INITIATE_WAKEUP_FROM_LOWPWR_MASK    BIT(28)
+
+static struct lpass_info {
+       struct platform_device  *pdev;
+       void __iomem            *reg_sfr;
+       struct regmap           *reg_pmu;
+};
+
+static void lpass_enable(struct lpass_info *lpass)
+{
+       if (!lpass->reg_pmu)
+               return;
+
+       /* Unmasks SFR, DMA, I2S Interrupt */
+       writel(LPASS_INTR_SFR | LPASS_INTR_DMA | LPASS_INTR_I2S,
+              lpass->reg_sfr + SFR_LPASS_INTR_CA5_MASK);
+
+       writel(LPASS_INTR_DMA | LPASS_INTR_I2S | LPASS_INTR_SFR,
+              lpass->reg_sfr + SFR_LPASS_INTR_CPU_MASK);
+
+       /* Active related PADs from retention state */
+       regmap_write(lpass->reg_pmu,
+                    EXYNOS5433_PAD_RETENTION_AUD_OPTION_OFFSET,
+                    EXYNOS5433_INITIATE_WAKEUP_FROM_LOWPWR_MASK);
+}
+
+static int lpass_probe(struct platform_device *pdev)
+{
+       struct lpass_info *lpass;
+       struct device *dev = &pdev->dev;
+       struct device_node *np = dev->of_node;
+       struct resource *res;
+
+       if (!np) {
+               dev_err(dev, "Failed to get DT node\n");
+               return -ENODEV;
+       }
+
+       lpass = devm_kzalloc(dev, sizeof(*lpass), GFP_KERNEL);
+       if (!lpass)
+               return -ENOMEM;
+
+       lpass->pdev = pdev;
+       platform_set_drvdata(pdev, lpass);
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res) {
+               dev_err(dev, "Failed to get SFR address\n");
+               return -ENXIO;
+       }
+
+       lpass->reg_sfr = devm_ioremap_resource(dev, res);
+       if (IS_ERR(lpass->reg_sfr))
+               return PTR_ERR(lpass->reg_sfr);
+
+       lpass->reg_pmu = syscon_regmap_lookup_by_phandle(np,
+                                                        "samsung,pmu-syscon");
+       if (IS_ERR(lpass->reg_pmu)) {
+               dev_err(dev, "Failed to lookup PMU regmap\n");
+               return PTR_ERR(lpass->reg_pmu);
+       }
+
+       lpass_enable(lpass);
+
+       return 0;
+}
+
+static const struct of_device_id lpass_of_match[] = {
+       { .compatible   = "samsung,exynos5433-lpass", },
+       { },
+};
+MODULE_DEVICE_TABLE(of, lpass_of_match);
+
+static struct platform_driver lpass_driver = {
+       .driver = {
+               .name           = "samsung-lpass",
+               .owner          = THIS_MODULE,
+               .of_match_table = lpass_of_match,
+       },
+       .probe  = lpass_probe,
+};
+
+module_platform_driver(lpass_driver);
+
+MODULE_AUTHOR("Inha Song <ideal.song@samsung.com>");
+MODULE_DESCRIPTION("Samsung Low Power Audio Subsystem Interface");
+MODULE_LICENSE("GPL v2");

diff --git a/sound/soc/samsung/lpass.h b/sound/soc/samsung/lpass.h
new file mode 100644 (file)
index 0000000..137705b
--- /dev/null
+++ b/sound/soc/samsung/lpass.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2015 Samsung Electronics Co., Ltd.
+ *     Inha Song <ideal.song@samsung.com>
+ *
+ * Low Power Audio SubSystem driver for Samsung Exynos
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+#ifndef __SND_SOC_SAMSUNG_LPASS_H
+#define __SND_SOC_SAMSUNG_LPASS_H
+
+/* SFR */
+#define SFR_LPASS_INTR_CA5_MASK        (0x48)
+#define SFR_LPASS_INTR_CPU_MASK        (0x58)
+
+/* SW_RESET */
+#define LPASS_SW_RESET_CA5     (1 << 0)
+#define LPASS_SW_RESET_SB      (1 << 11)
+
+/* Interrupt mask */
+#define LPASS_INTR_APM         (1 << 9)
+#define LPASS_INTR_MIF         (1 << 8)
+#define LPASS_INTR_TIMER       (1 << 7)
+#define LPASS_INTR_DMA         (1 << 6)
+#define LPASS_INTR_GPIO                (1 << 5)
+#define LPASS_INTR_I2S         (1 << 4)
+#define LPASS_INTR_PCM         (1 << 3)
+#define LPASS_INTR_SB          (1 << 2)
+#define LPASS_INTR_UART                (1 << 1)
+#define LPASS_INTR_SFR         (1 << 0)
+
+#endif /* __SND_SOC_SAMSUNG_LPASS_H */