The patch

ASoC: stm32: add bindings for SAI

has been applied to the asoc tree at

git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git

All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying to this mail.

Thanks, Mark

From b45c4f117b002a902e8b9f52eaf542e3e82c36a8 Mon Sep 17 00:00:00 2001

From: olivier moysan olivier.moysan@st.com Date: Mon, 10 Apr 2017 17:19:55 +0200 Subject: [PATCH] ASoC: stm32: add bindings for SAI

This patch adds documentation of device tree bindings for the STM32 SAI ASoC driver.

Signed-off-by: olivier moysan olivier.moysan@st.com Signed-off-by: Mark Brown broonie@kernel.org --- .../devicetree/bindings/sound/st,stm32-sai.txt | 89 ++++++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/st,stm32-sai.txt

diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt new file mode 100644 index 000000000000..c59a3d779e06 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt @@ -0,0 +1,89 @@ +STMicroelectronics STM32 Serial Audio Interface (SAI). + +The SAI interface (Serial Audio Interface) offers a wide set of audio protocols +as I2S standards, LSB or MSB-justified, PCM/DSP, TDM, and AC'97. +The SAI contains two independent audio sub-blocks. Each sub-block has +its own clock generator and I/O lines controller. + +Required properties: + - compatible: Should be "st,stm32f4-sai" + - reg: Base address and size of SAI common register set. + - clocks: Must contain phandle and clock specifier pairs for each entry + in clock-names. + - clock-names: Must contain "x8k" and "x11k" + "x8k": SAI parent clock for sampling rates multiple of 8kHz. + "x11k": SAI parent clock for sampling rates multiple of 11.025kHz. + - interrupts: cpu DAI interrupt line shared by SAI sub-blocks + +Optional properties: + - resets: Reference to a reset controller asserting the SAI + +SAI subnodes: +Two subnodes corresponding to SAI sub-block instances A et B can be defined. +Subnode can be omitted for unsused sub-block. + +SAI subnodes required properties: + - compatible: Should be "st,stm32-sai-sub-a" or "st,stm32-sai-sub-b" + for SAI sub-block A or B respectively. + - reg: Base address and size of SAI sub-block register set. + - clocks: Must contain one phandle and clock specifier pair + for sai_ck which feeds the internal clock generator. + - clock-names: Must contain "sai_ck". + - dmas: see Documentation/devicetree/bindings/dma/stm32-dma.txt + - dma-names: identifier string for each DMA request line + "tx": if sai sub-block is configured as playback DAI + "rx": if sai sub-block is configured as capture DAI + - pinctrl-names: should contain only value "default" + - pinctrl-0: see Documentation/devicetree/bindings/pinctrl/pinctrl-stm32.txt + +Example: +sound_card { + compatible = "audio-graph-card"; + dais = <&sai1b_port>; +}; + +sai1: sai1@40015800 { + compatible = "st,stm32f4-sai"; + #address-cells = <1>; + #size-cells = <1>; + ranges; + reg = <0x40015800 0x4>; + clocks = <&rcc 1 CLK_SAIQ_PDIV>, <&rcc 1 CLK_I2SQ_PDIV>; + clock-names = "x8k", "x11k"; + interrupts = <87>; + + sai1b: audio-controller@40015824 { + #sound-dai-cells = <0>; + compatible = "st,stm32-sai-sub-b"; + reg = <0x40015824 0x1C>; + clocks = <&rcc 1 CLK_SAI2>; + clock-names = "sai_ck"; + dmas = <&dma2 5 0 0x400 0x0>; + dma-names = "tx"; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_sai1b>; + + ports { + #address-cells = <1>; + #size-cells = <0>; + + sai1b_port: port@0 { + reg = <0>; + cpu_endpoint: endpoint { + remote-endpoint = <&codec_endpoint>; + audio-graph-card,format = "i2s"; + audio-graph-card,bitclock-master = <&codec_endpoint>; + audio-graph-card,frame-master = <&codec_endpoint>; + }; + }; + }; + }; +}; + +audio-codec { + codec_port: port { + codec_endpoint: endpoint { + remote-endpoint = <&cpu_endpoint>; + }; + }; +};

Hello Rob,

On 04/28/2017 10:53 PM, Rob Herring wrote:

On Mon, Apr 10, 2017 at 05:19:55PM +0200, olivier moysan wrote:

...

This patch adds documentation of device tree bindings for the STM32 SAI ASoC driver.

Signed-off-by: olivier moysan olivier.moysan@st.com

.../devicetree/bindings/sound/st,stm32-sai.txt | 89 ++++++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/st,stm32-sai.txt

diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt new file mode 100644 index 0000000..c59a3d7 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt @@ -0,0 +1,89 @@ +STMicroelectronics STM32 Serial Audio Interface (SAI).

[...]

...

• sai1b: audio-controller@40015824 {

• #sound-dai-cells = <0>;
  

• compatible = "st,stm32-sai-sub-b";
  

• reg = <0x40015824 0x1C>;
  

• clocks = <&rcc 1 CLK_SAI2>;
  

• clock-names = "sai_ck";
  

• dmas = <&dma2 5 0 0x400 0x0>;
  

• dma-names = "tx";
  

• pinctrl-names = "default";
  

• pinctrl-0 = <&pinctrl_sai1b>;
  

• ports {
  

• 	#address-cells = <1>;
  

• 	#size-cells = <0>;
  

• 	sai1b_port: port@0 {
  

• 		reg = <0>;
  

• 		cpu_endpoint: endpoint {
  

• 			remote-endpoint = <&codec_endpoint>;
  

• 			audio-graph-card,format = "i2s";
  

• 			audio-graph-card,bitclock-master = <&codec_endpoint>;
  

• 			audio-graph-card,frame-master = <&codec_endpoint>;
  

These property names are wrong.

I have taken into account this comment (and previous ones). They will be included in next update of this patch set.

...

• 		};
  

• 	};
  

• };
  

• };

+};

+audio-codec {

• codec_port: port {

• codec_endpoint: endpoint {
  

• 	remote-endpoint = <&cpu_endpoint>;
  

• };
  

• };

+};

1.9.1

Best regards Olivier

This patch implements SAI ASoC driver for STM32.

some minor comments below

Signed-off-by: olivier moysan olivier.moysan@st.com

sound/soc/Kconfig | 1 + sound/soc/Makefile | 1 + sound/soc/stm/Kconfig | 8 + sound/soc/stm/Makefile | 6 + sound/soc/stm/stm32_sai.c | 115 ++++++ sound/soc/stm/stm32_sai.h | 200 ++++++++++ sound/soc/stm/stm32_sai_sub.c | 884 ++++++++++++++++++++++++++++++++++++++++++ 7 files changed, 1215 insertions(+) create mode 100644 sound/soc/stm/Kconfig create mode 100644 sound/soc/stm/Makefile create mode 100644 sound/soc/stm/stm32_sai.c create mode 100644 sound/soc/stm/stm32_sai.h create mode 100644 sound/soc/stm/stm32_sai_sub.c

diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig index 182d92e..3836ebe 100644 --- a/sound/soc/Kconfig +++ b/sound/soc/Kconfig @@ -63,6 +63,7 @@ source "sound/soc/sh/Kconfig" source "sound/soc/sirf/Kconfig" source "sound/soc/spear/Kconfig" source "sound/soc/sti/Kconfig" +source "sound/soc/stm/Kconfig" source "sound/soc/sunxi/Kconfig" source "sound/soc/tegra/Kconfig" source "sound/soc/txx9/Kconfig" diff --git a/sound/soc/Makefile b/sound/soc/Makefile index 9a30f21..5440cf7 100644 --- a/sound/soc/Makefile +++ b/sound/soc/Makefile @@ -43,6 +43,7 @@ obj-$(CONFIG_SND_SOC) += sh/ obj-$(CONFIG_SND_SOC) += sirf/ obj-$(CONFIG_SND_SOC) += spear/ obj-$(CONFIG_SND_SOC) += sti/ +obj-$(CONFIG_SND_SOC) += stm/ obj-$(CONFIG_SND_SOC) += sunxi/ obj-$(CONFIG_SND_SOC) += tegra/ obj-$(CONFIG_SND_SOC) += txx9/ diff --git a/sound/soc/stm/Kconfig b/sound/soc/stm/Kconfig new file mode 100644 index 0000000..972970f --- /dev/null +++ b/sound/soc/stm/Kconfig @@ -0,0 +1,8 @@ +menuconfig SND_SOC_STM32

• tristate "STMicroelectronics STM32 SOC audio support"
• depends on ARCH_STM32 || COMPILE_TEST
• depends on SND_SOC
• select SND_SOC_GENERIC_DMAENGINE_PCM
• select REGMAP_MMIO
• help

•  Say Y if you want to enable ASoC-support for STM32
  

without '-' after ASoC probably

diff --git a/sound/soc/stm/Makefile b/sound/soc/stm/Makefile new file mode 100644 index 0000000..e466a47 --- /dev/null +++ b/sound/soc/stm/Makefile @@ -0,0 +1,6 @@ +# SAI +snd-soc-stm32-sai-sub-objs := stm32_sai_sub.o +obj-$(CONFIG_SND_SOC_STM32) += snd-soc-stm32-sai-sub.o

+snd-soc-stm32-sai-objs := stm32_sai.o +obj-$(CONFIG_SND_SOC_STM32) += snd-soc-stm32-sai.o diff --git a/sound/soc/stm/stm32_sai.c b/sound/soc/stm/stm32_sai.c new file mode 100644 index 0000000..2a27a26 --- /dev/null +++ b/sound/soc/stm/stm32_sai.c @@ -0,0 +1,115 @@ +/*

• • STM32 ALSA SoC Digital Audio Interface (SAI) driver.
• • Copyright (C) 2016, STMicroelectronics - All Rights Reserved
• • Author(s): Olivier Moysan olivier.moysan@st.com for STMicroelectronics.
• • License terms: GPL V2.0.
• • 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/module.h> +#include <linux/of_platform.h> +#include <linux/reset.h>

+#include <sound/dmaengine_pcm.h> +#include <sound/core.h>

+#include "stm32_sai.h"

+static const struct of_device_id stm32_sai_ids[] = {

• { .compatible = "st,stm32f4-sai", .data = (void *)SAI_STM32F4 },
• {}

+};

+static int stm32_sai_probe(struct platform_device *pdev) +{

• struct device_node *np = pdev->dev.of_node;
• struct stm32_sai_data *sai;
• struct reset_control *rst;
• struct resource *res;
• void __iomem *base;
• const struct of_device_id *of_id;
• sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
• if (!sai)

• return -ENOMEM;
  

• res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
• base = devm_ioremap_resource(&pdev->dev, res);
• if (IS_ERR(base))

• return PTR_ERR(base);
  

• of_id = of_match_device(stm32_sai_ids, &pdev->dev);
• if (of_id)

• sai->version = (enum stm32_sai_version)of_id->data;
  

• else

• return -EINVAL;
  

• sai->clk_x8k = devm_clk_get(&pdev->dev, "x8k");
• if (IS_ERR(sai->clk_x8k)) {

• dev_err(&pdev->dev, "missing x8k parent clock\n");
  

• return PTR_ERR(sai->clk_x8k);
  

• }
• sai->clk_x11k = devm_clk_get(&pdev->dev, "x11k");
• if (IS_ERR(sai->clk_x11k)) {

• dev_err(&pdev->dev, "missing x11k parent clock\n");
  

• return PTR_ERR(sai->clk_x11k);
  

• }
• /* init irqs */
• sai->irq = platform_get_irq(pdev, 0);
• if (sai->irq < 0) {

• dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
  

• return sai->irq;
  

• }
• /* reset */
• rst = reset_control_get(&pdev->dev, NULL);
• if (!IS_ERR(rst)) {

• reset_control_assert(rst);
  

• udelay(2);
  

• reset_control_deassert(rst);
  

• }
• sai->pdev = pdev;
• platform_set_drvdata(pdev, sai);
• return of_platform_populate(np, NULL, NULL, &pdev->dev);

+}

+static int stm32_sai_remove(struct platform_device *pdev) +{

• of_platform_depopulate(&pdev->dev);
• return 0;

+}

+MODULE_DEVICE_TABLE(of, stm32_sai_ids);

+static struct platform_driver stm32_sai_driver = {

• .driver = {

• .name = "st,stm32-sai",
  

• .of_match_table = stm32_sai_ids,
  

• },
• .probe = stm32_sai_probe,
• .remove = stm32_sai_remove,

+};

+module_platform_driver(stm32_sai_driver);

+MODULE_DESCRIPTION("STM32 Soc SAI Interface"); +MODULE_AUTHOR("Olivier Moysan, olivier.moysan@st.com");

, after your name?

+MODULE_ALIAS("platform:st,stm32-sai"); +MODULE_LICENSE("GPL v2"); diff --git a/sound/soc/stm/stm32_sai.h b/sound/soc/stm/stm32_sai.h new file mode 100644 index 0000000..a801fda --- /dev/null +++ b/sound/soc/stm/stm32_sai.h @@ -0,0 +1,200 @@ +/*

• • STM32 ALSA SoC Digital Audio Interface (SAI) driver.
• • Copyright (C) 2016, STMicroelectronics - All Rights Reserved
• • Author(s): Olivier Moysan olivier.moysan@st.com for STMicroelectronics.
• • License terms: GPL V2.0.
• • 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.
• */

+/******************** SAI Register Map **************************************/

+/* common register */ +#define STM_SAI_GCR 0x00

+/* Sub-block A&B registers offsets, relative to A&B sub-block addresses */ +#define STM_SAI_CR1_REGX 0x00 /* A offset: 0x04. B offset: 0x24 */ +#define STM_SAI_CR2_REGX 0x04 +#define STM_SAI_FRCR_REGX 0x08 +#define STM_SAI_SLOTR_REGX 0x0C +#define STM_SAI_IMR_REGX 0x10 +#define STM_SAI_SR_REGX 0x14 +#define STM_SAI_CLRFR_REGX 0x18 +#define STM_SAI_DR_REGX 0x1C

+/******************** Bit definition for SAI_GCR register *******************/ +#define SAI_GCR_SYNCIN_SHIFT 0 +#define SAI_GCR_SYNCIN_MASK GENMASK(1, SAI_GCR_SYNCIN_SHIFT) +#define SAI_GCR_SYNCIN_SET(x) ((x) << SAI_GCR_SYNCIN_SHIFT)

+#define SAI_GCR_SYNCOUT_SHIFT 4 +#define SAI_GCR_SYNCOUT_MASK GENMASK(5, SAI_GCR_SYNCOUT_SHIFT) +#define SAI_GCR_SYNCOUT_SET(x) ((x) << SAI_GCR_SYNCOUT_SHIFT)

+/******************* Bit definition for SAI_XCR1 register *******************/ +#define SAI_XCR1_RX_TX_SHIFT 0 +#define SAI_XCR1_RX_TX BIT(SAI_XCR1_RX_TX_SHIFT) +#define SAI_XCR1_SLAVE_SHIFT 1 +#define SAI_XCR1_SLAVE BIT(SAI_XCR1_SLAVE_SHIFT)

+#define SAI_XCR1_PRTCFG_SHIFT 2 +#define SAI_XCR1_PRTCFG_MASK GENMASK(3, SAI_XCR1_PRTCFG_SHIFT) +#define SAI_XCR1_PRTCFG_SET(x) ((x) << SAI_XCR1_PRTCFG_SHIFT)

+#define SAI_XCR1_DS_SHIFT 5 +#define SAI_XCR1_DS_MASK GENMASK(7, SAI_XCR1_DS_SHIFT) +#define SAI_XCR1_DS_SET(x) ((x) << SAI_XCR1_DS_SHIFT)

+#define SAI_XCR1_LSBFIRST_SHIFT 8 +#define SAI_XCR1_LSBFIRST BIT(SAI_XCR1_LSBFIRST_SHIFT) +#define SAI_XCR1_CKSTR_SHIFT 9 +#define SAI_XCR1_CKSTR BIT(SAI_XCR1_CKSTR_SHIFT)

+#define SAI_XCR1_SYNCEN_SHIFT 10 +#define SAI_XCR1_SYNCEN_MASK GENMASK(11, SAI_XCR1_SYNCEN_SHIFT) +#define SAI_XCR1_SYNCEN_SET(x) ((x) << SAI_XCR1_SYNCEN_SHIFT)

+#define SAI_XCR1_MONO_SHIFT 12 +#define SAI_XCR1_MONO BIT(SAI_XCR1_MONO_SHIFT) +#define SAI_XCR1_OUTDRIV_SHIFT 13 +#define SAI_XCR1_OUTDRIV BIT(SAI_XCR1_OUTDRIV_SHIFT) +#define SAI_XCR1_SAIEN_SHIFT 16 +#define SAI_XCR1_SAIEN BIT(SAI_XCR1_SAIEN_SHIFT) +#define SAI_XCR1_DMAEN_SHIFT 17 +#define SAI_XCR1_DMAEN BIT(SAI_XCR1_DMAEN_SHIFT) +#define SAI_XCR1_NODIV_SHIFT 19 +#define SAI_XCR1_NODIV BIT(SAI_XCR1_NODIV_SHIFT)

+#define SAI_XCR1_MCKDIV_SHIFT 20 +#define SAI_XCR1_MCKDIV_WIDTH 4 +#define SAI_XCR1_MCKDIV_MASK GENMASK(24, SAI_XCR1_MCKDIV_SHIFT) +#define SAI_XCR1_MCKDIV_SET(x) ((x) << SAI_XCR1_MCKDIV_SHIFT) +#define SAI_XCR1_MCKDIV_MAX ((1 << SAI_XCR1_MCKDIV_WIDTH) - 1)

+#define SAI_XCR1_OSR_SHIFT 26 +#define SAI_XCR1_OSR BIT(SAI_XCR1_OSR_SHIFT)

+/******************* Bit definition for SAI_XCR2 register *******************/ +#define SAI_XCR2_FTH_SHIFT 0 +#define SAI_XCR2_FTH_MASK GENMASK(2, SAI_XCR2_FTH_SHIFT) +#define SAI_XCR2_FTH_SET(x) ((x) << SAI_XCR2_FTH_SHIFT)

+#define SAI_XCR2_FFLUSH_SHIFT 3 +#define SAI_XCR2_FFLUSH BIT(SAI_XCR2_FFLUSH_SHIFT) +#define SAI_XCR2_TRIS_SHIFT 4 +#define SAI_XCR2_TRIS BIT(SAI_XCR2_TRIS_SHIFT) +#define SAI_XCR2_MUTE_SHIFT 5 +#define SAI_XCR2_MUTE BIT(SAI_XCR2_MUTE_SHIFT) +#define SAI_XCR2_MUTEVAL_SHIFT 6 +#define SAI_XCR2_MUTEVAL BIT(SAI_XCR2_MUTEVAL_SHIFT)

+#define SAI_XCR2_MUTECNT_SHIFT 7 +#define SAI_XCR2_MUTECNT_MASK GENMASK(12, SAI_XCR2_MUTECNT_SHIFT) +#define SAI_XCR2_MUTECNT_SET(x) ((x) << SAI_XCR2_MUTECNT_SHIFT)

+#define SAI_XCR2_CPL_SHIFT 13 +#define SAI_XCR2_CPL BIT(SAI_XCR2_CPL_SHIFT)

+#define SAI_XCR2_COMP_SHIFT 14 +#define SAI_XCR2_COMP_MASK GENMASK(15, SAI_XCR2_COMP_SHIFT) +#define SAI_XCR2_COMP_SET(x) ((x) << SAI_XCR2_COMP_SHIFT)

+/****************** Bit definition for SAI_XFRCR register *******************/ +#define SAI_XFRCR_FRL_SHIFT 0 +#define SAI_XFRCR_FRL_MASK GENMASK(7, SAI_XFRCR_FRL_SHIFT) +#define SAI_XFRCR_FRL_SET(x) ((x) << SAI_XFRCR_FRL_SHIFT)

+#define SAI_XFRCR_FSALL_SHIFT 8 +#define SAI_XFRCR_FSALL_MASK GENMASK(14, SAI_XFRCR_FSALL_SHIFT) +#define SAI_XFRCR_FSALL_SET(x) ((x) << SAI_XFRCR_FSALL_SHIFT)

+#define SAI_XFRCR_FSDEF_SHIFT 16 +#define SAI_XFRCR_FSDEF BIT(SAI_XFRCR_FSDEF_SHIFT) +#define SAI_XFRCR_FSPOL_SHIFT 17 +#define SAI_XFRCR_FSPOL BIT(SAI_XFRCR_FSPOL_SHIFT) +#define SAI_XFRCR_FSOFF_SHIFT 18 +#define SAI_XFRCR_FSOFF BIT(SAI_XFRCR_FSOFF_SHIFT)

+/****************** Bit definition for SAI_XSLOTR register ******************/

no newline (as above)?

+#define SAI_XSLOTR_FBOFF_SHIFT 0 +#define SAI_XSLOTR_FBOFF_MASK GENMASK(4, SAI_XSLOTR_FBOFF_SHIFT) +#define SAI_XSLOTR_FBOFF_SET(x) ((x) << SAI_XSLOTR_FBOFF_SHIFT)

+#define SAI_XSLOTR_SLOTSZ_SHIFT 6 +#define SAI_XSLOTR_SLOTSZ_MASK GENMASK(7, SAI_XSLOTR_SLOTSZ_SHIFT) +#define SAI_XSLOTR_SLOTSZ_SET(x) ((x) << SAI_XSLOTR_SLOTSZ_SHIFT)

+#define SAI_XSLOTR_NBSLOT_SHIFT 8 +#define SAI_XSLOTR_NBSLOT_MASK GENMASK(11, SAI_XSLOTR_NBSLOT_SHIFT) +#define SAI_XSLOTR_NBSLOT_SET(x) ((x) << SAI_XSLOTR_NBSLOT_SHIFT)

+#define SAI_XSLOTR_SLOTEN_SHIFT 16 +#define SAI_XSLOTR_SLOTEN_WIDTH 16 +#define SAI_XSLOTR_SLOTEN_MASK GENMASK(31, SAI_XSLOTR_SLOTEN_SHIFT) +#define SAI_XSLOTR_SLOTEN_SET(x) ((x) << SAI_XSLOTR_SLOTEN_SHIFT)

+/******************* Bit definition for SAI_XIMR register *******************/ +#define SAI_XIMR_OVRUDRIE BIT(0) +#define SAI_XIMR_MUTEDETIE BIT(1) +#define SAI_XIMR_WCKCFGIE BIT(2) +#define SAI_XIMR_FREQIE BIT(3) +#define SAI_XIMR_CNRDYIE BIT(4) +#define SAI_XIMR_AFSDETIE BIT(5) +#define SAI_XIMR_LFSDETIE BIT(6)

+#define SAI_XIMR_SHIFT 0 +#define SAI_XIMR_MASK GENMASK(6, SAI_XIMR_SHIFT)

+/******************** Bit definition for SAI_XSR register *******************/ +#define SAI_XSR_OVRUDR BIT(0) +#define SAI_XSR_MUTEDET BIT(1) +#define SAI_XSR_WCKCFG BIT(2) +#define SAI_XSR_FREQ BIT(3) +#define SAI_XSR_CNRDY BIT(4) +#define SAI_XSR_AFSDET BIT(5) +#define SAI_XSR_LFSDET BIT(6)

+#define SAI_XSR_SHIFT 0 +#define SAI_XSR_MASK GENMASK(6, SAI_XSR_SHIFT)

+/****************** Bit definition for SAI_XCLRFR register ******************/ +#define SAI_XCLRFR_COVRUDR BIT(0) +#define SAI_XCLRFR_CMUTEDET BIT(1) +#define SAI_XCLRFR_CWCKCFG BIT(2) +#define SAI_XCLRFR_CFREQ BIT(3) +#define SAI_XCLRFR_CCNRDY BIT(4) +#define SAI_XCLRFR_CAFSDET BIT(5) +#define SAI_XCLRFR_CLFSDET BIT(6)

+#define SAI_XCLRFR_SHIFT 0 +#define SAI_XCLRFR_MASK GENMASK(6, SAI_XCLRFR_SHIFT)

+enum stm32_sai_version {

• SAI_STM32F4

+};

+/**

• • struct stm32_sai_data - private data of SAI instance driver
• • @pdev: device data pointer
• • @clk_x8k: SAI parent clock for sampling frequencies multiple of 8kHz
• • @clk_x11k: SAI parent clock for sampling frequencies multiple of 11kHz
• • @version: SOC version
• • @irq: SAI interrupt line
• */

+struct stm32_sai_data {

• struct platform_device *pdev;
• struct clk *clk_x8k;
• struct clk *clk_x11k;
• int version;
• int irq;

+}; diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c new file mode 100644 index 0000000..ae4706c --- /dev/null +++ b/sound/soc/stm/stm32_sai_sub.c @@ -0,0 +1,884 @@ +/*

• • STM32 ALSA SoC Digital Audio Interface (SAI) driver.
• • Copyright (C) 2016, STMicroelectronics - All Rights Reserved
• • Author(s): Olivier Moysan olivier.moysan@st.com for STMicroelectronics.
• • License terms: GPL V2.0.
• • 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/kernel.h> +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/regmap.h>

+#include <sound/core.h> +#include <sound/dmaengine_pcm.h> +#include <sound/pcm_params.h>

+#include "stm32_sai.h"

+#define SAI_FREE_PROTOCOL 0x0

+#define SAI_SLOT_SIZE_AUTO 0x0 +#define SAI_SLOT_SIZE_16 0x1 +#define SAI_SLOT_SIZE_32 0x2

+#define SAI_DATASIZE_8 0x2 +#define SAI_DATASIZE_10 0x3 +#define SAI_DATASIZE_16 0x4 +#define SAI_DATASIZE_20 0x5 +#define SAI_DATASIZE_24 0x6 +#define SAI_DATASIZE_32 0x7

+#define STM_SAI_FIFO_SIZE 8 +#define STM_SAI_DAI_NAME_SIZE 15

+#define STM_SAI_IS_PLAYBACK(ip) ((ip)->dir == SNDRV_PCM_STREAM_PLAYBACK) +#define STM_SAI_IS_CAPTURE(ip) ((ip)->dir == SNDRV_PCM_STREAM_CAPTURE)

+#define STM_SAI_A_ID 0x0 +#define STM_SAI_B_ID 0x1

+#define STM_SAI_BLOCK_NAME(x) (((x)->id == STM_SAI_A_ID) ? "A" : "B")

+/**

• • struct stm32_sai_sub_data - private data of SAI sub block (block A or B)
• • @pdev: device data pointer
• • @regmap: SAI register map pointer
• • @dma_params: dma configuration data for rx or tx channel
• • @cpu_dai_drv: DAI driver data pointer
• • @cpu_dai: DAI runtime data pointer
• • @substream: PCM substream data pointer
• • @pdata: SAI block parent data pointer
• • @sai_ck: kernel clock feeding the SAI clock generator
• • @phys_addr: SAI registers physical base address
• • @mclk_rate: SAI block master clock frequency (Hz). set at init
• • @id: SAI sub block id corresponding to sub-block A or B
• • @dir: SAI block direction (playback or capture). set at init
• • @master: SAI block mode flag. (true=master, false=slave) set at init
• • @fmt: SAI block format. relevant only for custom protocols. set at init
• • @sync: SAI block synchronization mode. (none, internal or external)
• • @fs_length: frame synchronization length. depends on protocol settings
• • @slots: rx or tx slot number
• • @slot_width: rx or tx slot width in bits
• • @slot_mask: rx or tx active slots mask. set at init or at runtime
• • @data_size: PCM data width. corresponds to PCM substream width.
• */

+struct stm32_sai_sub_data {

• struct platform_device *pdev;
• struct regmap *regmap;
• struct snd_dmaengine_dai_dma_data dma_params;
• struct snd_soc_dai_driver *cpu_dai_drv;
• struct snd_soc_dai *cpu_dai;
• struct snd_pcm_substream *substream;
• struct stm32_sai_data *pdata;
• struct clk *sai_ck;
• dma_addr_t phys_addr;
• unsigned int mclk_rate;
• unsigned int id;
• int dir;
• bool master;
• int fmt;
• int sync;
• int fs_length;
• int slots;
• int slot_width;
• int slot_mask;
• int data_size;

+};

+enum stm32_sai_fifo_th {

• STM_SAI_FIFO_TH_EMPTY,
• STM_SAI_FIFO_TH_QUARTER,
• STM_SAI_FIFO_TH_HALF,
• STM_SAI_FIFO_TH_3_QUARTER,
• STM_SAI_FIFO_TH_FULL,

+};

+static bool stm32_sai_sub_readable_reg(struct device *dev, unsigned int reg) +{

• switch (reg) {
• case STM_SAI_CR1_REGX:
• case STM_SAI_CR2_REGX:
• case STM_SAI_FRCR_REGX:
• case STM_SAI_SLOTR_REGX:
• case STM_SAI_IMR_REGX:
• case STM_SAI_SR_REGX:
• case STM_SAI_CLRFR_REGX:
• case STM_SAI_DR_REGX:

• return true;
  

• default:

• return false;
  

• }

+}

+static bool stm32_sai_sub_volatile_reg(struct device *dev, unsigned int reg) +{

• switch (reg) {
• case STM_SAI_DR_REGX:

• return true;
  

• default:

• return false;
  

• }

+}

+static bool stm32_sai_sub_writeable_reg(struct device *dev, unsigned int reg) +{

• switch (reg) {
• case STM_SAI_CR1_REGX:
• case STM_SAI_CR2_REGX:
• case STM_SAI_FRCR_REGX:
• case STM_SAI_SLOTR_REGX:
• case STM_SAI_IMR_REGX:
• case STM_SAI_SR_REGX:
• case STM_SAI_CLRFR_REGX:
• case STM_SAI_DR_REGX:

• return true;
  

• default:

• return false;
  

• }

+}

+static const struct regmap_config stm32_sai_sub_regmap_config = {

• .reg_bits = 32,
• .reg_stride = 4,
• .val_bits = 32,
• .max_register = STM_SAI_DR_REGX,
• .readable_reg = stm32_sai_sub_readable_reg,
• .volatile_reg = stm32_sai_sub_volatile_reg,
• .writeable_reg = stm32_sai_sub_writeable_reg,
• .fast_io = true,

+};

+static irqreturn_t stm32_sai_isr(int irq, void *devid) +{

• struct stm32_sai_sub_data *sai = (struct stm32_sai_sub_data *)devid;
• struct snd_pcm_substream *substream = sai->substream;
• struct platform_device *pdev = sai->pdev;
• unsigned int sr, imr, flags;
• snd_pcm_state_t status = SNDRV_PCM_STATE_RUNNING;
• regmap_read(sai->regmap, STM_SAI_IMR_REGX, &imr);
• regmap_read(sai->regmap, STM_SAI_SR_REGX, &sr);
• flags = sr & imr;
• if (!flags)

• return IRQ_NONE;
  

• regmap_update_bits(sai->regmap, STM_SAI_CLRFR_REGX, SAI_XCLRFR_MASK,

• 	   SAI_XCLRFR_MASK);
  

• if (flags & SAI_XIMR_OVRUDRIE) {

• dev_err(&pdev->dev, "IT %s\n",
  

wondering what IT is

• 	STM_SAI_IS_PLAYBACK(sai) ? "underrun" : "overrun");
  

• status = SNDRV_PCM_STATE_XRUN;
  

• }
• if (flags & SAI_XIMR_MUTEDETIE)

• dev_dbg(&pdev->dev, "IT mute detected\n");
  

• if (flags & SAI_XIMR_WCKCFGIE) {

• dev_err(&pdev->dev, "IT wrong clock configuration\n");
  

• status = SNDRV_PCM_STATE_DISCONNECTED;
  

• }
• if (flags & SAI_XIMR_CNRDYIE)

• dev_warn(&pdev->dev, "IT Codec not ready\n");
  

• if (flags & SAI_XIMR_AFSDETIE) {

• dev_warn(&pdev->dev, "IT Anticipated frame synchro\n");
  

• status = SNDRV_PCM_STATE_XRUN;
  

• }
• if (flags & SAI_XIMR_LFSDETIE) {

• dev_warn(&pdev->dev, "IT Late frame synchro\n");
  

• status = SNDRV_PCM_STATE_XRUN;
  

• }
• if (status != SNDRV_PCM_STATE_RUNNING) {

• snd_pcm_stream_lock(substream);
  

• snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
  

• snd_pcm_stream_unlock(substream);
  

• }
• return IRQ_HANDLED;

+}

+static int stm32_sai_set_sysclk(struct snd_soc_dai *cpu_dai,

• 		int clk_id, unsigned int freq, int dir)
  

+{

• struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
• if ((dir == SND_SOC_CLOCK_OUT) && sai->master) {

• sai->mclk_rate = freq;
  

• dev_dbg(cpu_dai->dev, "SAI MCLK frequency is %uHz\n", freq);
  

• }
• return 0;

+}

+static int stm32_sai_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask,

• 		      u32 rx_mask, int slots, int slot_width)
  

+{

• struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
• int slotr, slotr_mask, slot_size;
• dev_dbg(cpu_dai->dev, "masks tx/rx:%#x/%#x, slots:%d, width:%d\n",

• tx_mask, rx_mask, slots, slot_width);
  

• switch (slot_width) {
• case 16:

• slot_size = SAI_SLOT_SIZE_16;
  

• break;
  

• case 32:

• slot_size = SAI_SLOT_SIZE_32;
  

• break;
  

• default:

• slot_size = SAI_SLOT_SIZE_AUTO;
  

• break;
  

• }
• slotr = SAI_XSLOTR_SLOTSZ_SET(slot_size) |

• SAI_XSLOTR_NBSLOT_SET(slots - 1);
  

• slotr_mask = SAI_XSLOTR_SLOTSZ_MASK | SAI_XSLOTR_NBSLOT_MASK;
• /* tx/rx mask set in machine init, if slot number defined in DT */
• if (STM_SAI_IS_PLAYBACK(sai)) {

• sai->slot_mask = tx_mask;
  

• slotr |= SAI_XSLOTR_SLOTEN_SET(tx_mask);
  

• }
• if (STM_SAI_IS_CAPTURE(sai)) {

• sai->slot_mask = rx_mask;
  

• slotr |= SAI_XSLOTR_SLOTEN_SET(rx_mask);
  

• }
• slotr_mask |= SAI_XSLOTR_SLOTEN_MASK;
• regmap_update_bits(sai->regmap, STM_SAI_SLOTR_REGX, slotr_mask, slotr);
• sai->slot_width = slot_width;
• sai->slots = slots;
• return 0;

+}

+static int stm32_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) +{

• struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
• int cr1 = 0, frcr = 0;
• int cr1_mask = 0, frcr_mask = 0;
• int ret;
• dev_dbg(cpu_dai->dev, "fmt %x\n", fmt);
• switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
• /* SCK active high for all protocols */
• case SND_SOC_DAIFMT_I2S:

• cr1 |= SAI_XCR1_CKSTR;
  

• frcr |= SAI_XFRCR_FSOFF | SAI_XFRCR_FSDEF;
  

• break;
  

• /* Left justified */
• case SND_SOC_DAIFMT_MSB:

• frcr |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSDEF;
  

• break;
  

• /* Right justified */
• case SND_SOC_DAIFMT_LSB:

• frcr |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSDEF;
  

• break;
  

• case SND_SOC_DAIFMT_DSP_A:

• frcr |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSOFF;
  

• break;
  

• case SND_SOC_DAIFMT_DSP_B:

• frcr |= SAI_XFRCR_FSPOL;
  

• break;
  

• default:

• dev_err(cpu_dai->dev, "Unsupported protocol %#x\n",
  

nitpicking: messages are somethings starting uppercase, sometimes lowercase

• 	fmt & SND_SOC_DAIFMT_FORMAT_MASK);
  

• return -EINVAL;
  

• }
• cr1_mask |= SAI_XCR1_PRTCFG_MASK | SAI_XCR1_CKSTR;
• frcr_mask |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSOFF |

•      SAI_XFRCR_FSDEF;
  

• /* DAI clock strobing. Invert setting previously set */
• switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
• case SND_SOC_DAIFMT_NB_NF:

• break;
  

• case SND_SOC_DAIFMT_IB_NF:

• cr1 ^= SAI_XCR1_CKSTR;
  

• break;
  

• case SND_SOC_DAIFMT_NB_IF:

• frcr ^= SAI_XFRCR_FSPOL;
  

• break;
  

• case SND_SOC_DAIFMT_IB_IF:

• /* Invert fs & sck */
  

• cr1 ^= SAI_XCR1_CKSTR;
  

• frcr ^= SAI_XFRCR_FSPOL;
  

• break;
  

• default:

• dev_err(cpu_dai->dev, "Unsupported strobing %#x\n",
  

• 	fmt & SND_SOC_DAIFMT_INV_MASK);
  

• return -EINVAL;
  

• }
• cr1_mask |= SAI_XCR1_CKSTR;
• frcr_mask |= SAI_XFRCR_FSPOL;
• regmap_update_bits(sai->regmap, STM_SAI_FRCR_REGX, frcr_mask, frcr);
• /* DAI clock master masks */
• switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
• case SND_SOC_DAIFMT_CBM_CFM:

• /* codec is master */
  

• cr1 |= SAI_XCR1_SLAVE;
  

• sai->master = false;
  

• break;
  

• case SND_SOC_DAIFMT_CBS_CFS:

• sai->master = true;
  

• break;
  

• default:

• dev_err(cpu_dai->dev, "Unsupported mode %#x\n",
  

• 	fmt & SND_SOC_DAIFMT_MASTER_MASK);
  

• return -EINVAL;
  

• }
• cr1_mask |= SAI_XCR1_SLAVE;
• ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, cr1_mask, cr1);
• if (ret < 0) {

• dev_err(cpu_dai->dev, "Failed to update CR1 register\n");
  

• return ret;
  

• }
• sai->fmt = fmt;
• return 0;

+}

+static int stm32_sai_startup(struct snd_pcm_substream *substream,

• 	     struct snd_soc_dai *cpu_dai)
  

+{

• struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
• int imr, cr2, ret;
• sai->substream = substream;
• ret = clk_prepare_enable(sai->sai_ck);
• if (ret < 0) {

• dev_err(cpu_dai->dev, "failed to enable clock: %d\n", ret);
  

• return ret;
  

• }
• /* Enable ITs */
• regmap_update_bits(sai->regmap, STM_SAI_SR_REGX,

• 	   SAI_XSR_MASK, (unsigned int)~SAI_XSR_MASK);
  

• regmap_update_bits(sai->regmap, STM_SAI_CLRFR_REGX,

• 	   SAI_XCLRFR_MASK, SAI_XCLRFR_MASK);
  

• imr = SAI_XIMR_OVRUDRIE;
• if (STM_SAI_IS_CAPTURE(sai)) {

• regmap_read(sai->regmap, STM_SAI_CR2_REGX, &cr2);
  

• if (cr2 & SAI_XCR2_MUTECNT_MASK)
  

• 	imr |= SAI_XIMR_MUTEDETIE;
  

• }
• if (sai->master)

• imr |= SAI_XIMR_WCKCFGIE;
  

• else

• imr |= SAI_XIMR_AFSDETIE | SAI_XIMR_LFSDETIE;
  

• regmap_update_bits(sai->regmap, STM_SAI_IMR_REGX,

• 	   SAI_XIMR_MASK, imr);
  

• return 0;

+}

+static int stm32_sai_set_config(struct snd_soc_dai *cpu_dai,

• 		struct snd_pcm_substream *substream,
  

• 		struct snd_pcm_hw_params *params)
  

+{

• struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
• int cr1, cr1_mask, ret;
• int fth = STM_SAI_FIFO_TH_HALF;
• /* FIFO config */
• regmap_update_bits(sai->regmap, STM_SAI_CR2_REGX,

• 	   SAI_XCR2_FFLUSH | SAI_XCR2_FTH_MASK,
  

• 	   SAI_XCR2_FFLUSH | SAI_XCR2_FTH_SET(fth));
  

• /* Mode, data format and channel config */
• cr1 = SAI_XCR1_PRTCFG_SET(SAI_FREE_PROTOCOL);
• switch (params_format(params)) {
• case SNDRV_PCM_FORMAT_S8:

• cr1 |= SAI_XCR1_DS_SET(SAI_DATASIZE_8);
  

• break;
  

• case SNDRV_PCM_FORMAT_S16_LE:

• cr1 |= SAI_XCR1_DS_SET(SAI_DATASIZE_16);
  

• break;
  

• case SNDRV_PCM_FORMAT_S32_LE:

• cr1 |= SAI_XCR1_DS_SET(SAI_DATASIZE_32);
  

• break;
  

• default:

• dev_err(cpu_dai->dev, "Data format not supported");
  

• return -EINVAL;
  

• }
• cr1_mask = SAI_XCR1_DS_MASK | SAI_XCR1_PRTCFG_MASK;
• cr1_mask |= SAI_XCR1_RX_TX;
• if (STM_SAI_IS_CAPTURE(sai))

• cr1 |= SAI_XCR1_RX_TX;
  

• cr1_mask |= SAI_XCR1_MONO;
• if ((sai->slots == 2) && (params_channels(params) == 1))

• cr1 |= SAI_XCR1_MONO;
  

• ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, cr1_mask, cr1);
• if (ret < 0) {

• dev_err(cpu_dai->dev, "Failed to update CR1 register\n");
  

• return ret;
  

• }
• /* DMA config */
• sai->dma_params.maxburst = STM_SAI_FIFO_SIZE * fth / sizeof(u32);
• snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)&sai->dma_params);
• return 0;

+}

+static int stm32_sai_set_slots(struct snd_soc_dai *cpu_dai) +{

• struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
• int slotr, slot_sz;
• regmap_read(sai->regmap, STM_SAI_SLOTR_REGX, &slotr);
• /*

• * If SLOTSZ is set to auto in SLOTR, align slot width on data size
  

• * By default slot width = data size, if not forced from DT
  

• */
  

• slot_sz = slotr & SAI_XSLOTR_SLOTSZ_MASK;
• if (slot_sz == SAI_XSLOTR_SLOTSZ_SET(SAI_SLOT_SIZE_AUTO))

• sai->slot_width = sai->data_size;
  

• if (sai->slot_width < sai->data_size) {

• dev_err(cpu_dai->dev,
  

• 	"Data size %d larger than slot width\n",
  

• 	sai->data_size);
  

• return -EINVAL;
  

• }
• /* Slot number is set to 2, if not specified in DT */
• if (!sai->slots)

• sai->slots = 2;
  

• /* The number of slots in the audio frame is equal to NBSLOT[3:0] + 1*/
• regmap_update_bits(sai->regmap, STM_SAI_SLOTR_REGX,

• 	   SAI_XSLOTR_NBSLOT_MASK,
  

• 	   SAI_XSLOTR_NBSLOT_SET((sai->slots - 1)));
  

• /* Set default slots mask if not already set from DT */
• if (!(slotr & SAI_XSLOTR_SLOTEN_MASK)) {

• sai->slot_mask = (1 << sai->slots) - 1;
  

• regmap_update_bits(sai->regmap,
  

• 		   STM_SAI_SLOTR_REGX, SAI_XSLOTR_SLOTEN_MASK,
  

• 		   SAI_XSLOTR_SLOTEN_SET(sai->slot_mask));
  

• }
• dev_dbg(cpu_dai->dev, "slots %d, slot width %d\n",

• sai->slots, sai->slot_width);
  

• return 0;

+}

+static void stm32_sai_set_frame(struct snd_soc_dai *cpu_dai) +{

• struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
• int fs_active, offset, format;
• int frcr, frcr_mask;
• format = sai->fmt & SND_SOC_DAIFMT_FORMAT_MASK;
• sai->fs_length = sai->slot_width * sai->slots;
• fs_active = sai->fs_length / 2;
• if ((format == SND_SOC_DAIFMT_DSP_A) ||

•    (format == SND_SOC_DAIFMT_DSP_B))
  

• fs_active = 1;
  

• frcr = SAI_XFRCR_FRL_SET((sai->fs_length - 1));
• frcr |= SAI_XFRCR_FSALL_SET((fs_active - 1));
• frcr_mask = SAI_XFRCR_FRL_MASK | SAI_XFRCR_FSALL_MASK;
• dev_dbg(cpu_dai->dev, "frame length %d, frame active %d\n",

• sai->fs_length, fs_active);
  

• regmap_update_bits(sai->regmap, STM_SAI_FRCR_REGX, frcr_mask, frcr);
• if ((sai->fmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_LSB) {

• offset = sai->slot_width - sai->data_size;
  

• regmap_update_bits(sai->regmap, STM_SAI_SLOTR_REGX,
  

• 		   SAI_XSLOTR_FBOFF_MASK,
  

• 		   SAI_XSLOTR_FBOFF_SET(offset));
  

• }

+}

+static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,

• 		     struct snd_pcm_hw_params *params)
  

+{

• struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
• int cr1, mask, div = 0;
• int sai_clk_rate, ret;
• if (!sai->mclk_rate) {

• dev_err(cpu_dai->dev, "Mclk rate is null\n");
  

• return -EINVAL;
  

• }
• if (!(params_rate(params) % 11025))

• clk_set_parent(sai->sai_ck, sai->pdata->clk_x11k);
  

• else

• clk_set_parent(sai->sai_ck, sai->pdata->clk_x8k);
  

• sai_clk_rate = clk_get_rate(sai->sai_ck);
• /*

• * mclk_rate = 256 * fs
  

• * MCKDIV = 0 if sai_ck < 3/2 * mclk_rate
  

• * MCKDIV = sai_ck / (2 * mclk_rate) otherwise
  

• */
  

• if (2 * sai_clk_rate >= 3 * sai->mclk_rate)

• div = DIV_ROUND_CLOSEST(sai_clk_rate, 2 * sai->mclk_rate);
  

• if (div > SAI_XCR1_MCKDIV_MAX) {

• dev_err(cpu_dai->dev, "Divider %d out of range\n", div);
  

• return -EINVAL;
  

• }
• dev_dbg(cpu_dai->dev, "SAI clock %d, divider %d\n", sai_clk_rate, div);
• mask = SAI_XCR1_MCKDIV_MASK;
• cr1 = SAI_XCR1_MCKDIV_SET(div);
• ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, mask, cr1);
• if (ret < 0) {

• dev_err(cpu_dai->dev, "Failed to update CR1 register\n");
  

• return ret;
  

• }
• return 0;

+}

+static int stm32_sai_hw_params(struct snd_pcm_substream *substream,

• 	       struct snd_pcm_hw_params *params,
  

• 	       struct snd_soc_dai *cpu_dai)
  

+{

• struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
• int ret;
• sai->data_size = params_width(params);
• ret = stm32_sai_set_slots(cpu_dai);
• if (ret < 0)

• return ret;
  

• stm32_sai_set_frame(cpu_dai);
• ret = stm32_sai_set_config(cpu_dai, substream, params);
• if (ret)

• return ret;
  

• if (sai->master)

• ret = stm32_sai_configure_clock(cpu_dai, params);
  

• return ret;

+}

+static int stm32_sai_trigger(struct snd_pcm_substream *substream, int cmd,

• 	     struct snd_soc_dai *cpu_dai)
  

+{

• struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
• int ret;
• switch (cmd) {
• case SNDRV_PCM_TRIGGER_START:
• case SNDRV_PCM_TRIGGER_RESUME:
• case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

• dev_dbg(cpu_dai->dev, "Enable DMA and SAI\n");
  

• regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
  

• 		   SAI_XCR1_DMAEN, SAI_XCR1_DMAEN);
  

• /* Enable SAI */
  

• ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
  

• 			 SAI_XCR1_SAIEN, SAI_XCR1_SAIEN);
  

• if (ret < 0)
  

• 	dev_err(cpu_dai->dev, "Failed to update CR1 register\n");
  

• break;
  

• case SNDRV_PCM_TRIGGER_SUSPEND:
• case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
• case SNDRV_PCM_TRIGGER_STOP:

• dev_dbg(cpu_dai->dev, "Disable DMA and SAI\n");
  

• regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
  

• 		   SAI_XCR1_DMAEN,
  

• 		   (unsigned int)~SAI_XCR1_DMAEN);
  

• ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
  

• 			 SAI_XCR1_SAIEN,
  

• 			 (unsigned int)~SAI_XCR1_SAIEN);
  

• if (ret < 0)
  

• 	dev_err(cpu_dai->dev, "Failed to update CR1 register\n");
  

• break;
  

• default:

• return -EINVAL;
  

• }
• return ret;

+}

+static void stm32_sai_shutdown(struct snd_pcm_substream *substream,

• 	       struct snd_soc_dai *cpu_dai)
  

+{

• struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
• regmap_update_bits(sai->regmap, STM_SAI_IMR_REGX, SAI_XIMR_MASK, 0);
• clk_disable_unprepare(sai->sai_ck);
• sai->substream = NULL;

+}

+static int stm32_sai_dai_probe(struct snd_soc_dai *cpu_dai) +{

• struct stm32_sai_sub_data *sai = dev_get_drvdata(cpu_dai->dev);
• sai->dma_params.addr = (dma_addr_t)(sai->phys_addr + STM_SAI_DR_REGX);
• sai->dma_params.maxburst = 1;
• /* Buswidth will be set by framework at runtime */
• sai->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
• if (STM_SAI_IS_PLAYBACK(sai))

• snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params, NULL);
  

• else

• snd_soc_dai_init_dma_data(cpu_dai, NULL, &sai->dma_params);
  

• return 0;

+}

+static const struct snd_soc_dai_ops stm32_sai_pcm_dai_ops = {

• .set_sysclk = stm32_sai_set_sysclk,
• .set_fmt = stm32_sai_set_dai_fmt,
• .set_tdm_slot = stm32_sai_set_dai_tdm_slot,
• .startup = stm32_sai_startup,
• .hw_params = stm32_sai_hw_params,
• .trigger = stm32_sai_trigger,
• .shutdown = stm32_sai_shutdown,

+};

+static const struct snd_pcm_hardware stm32_sai_pcm_hw = {

• .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP,
• .buffer_bytes_max = 8 * PAGE_SIZE,
• .period_bytes_min = 1024, /* 5ms at 48kHz */
• .period_bytes_max = PAGE_SIZE,
• .periods_min = 2,
• .periods_max = 8,

+};

+static struct snd_soc_dai_driver stm32_sai_playback_dai[] = { +{

• .probe = stm32_sai_dai_probe,
  

• .id = 1, /* avoid call to fmt_single_name() */
  

• .playback = {
  

• 	.channels_min = 1,
  

• 	.channels_max = 2,
  

• 	.rate_min = 8000,
  

• 	.rate_max = 192000,
  

• 	.rates = SNDRV_PCM_RATE_CONTINUOUS,
  

• 	/* DMA does not support 24 bits transfers */
  

• 	.formats =
  

• 		SNDRV_PCM_FMTBIT_S8 |
  

• 		SNDRV_PCM_FMTBIT_S16_LE |
  

• 		SNDRV_PCM_FMTBIT_S32_LE,
  

• },
  

• .ops = &stm32_sai_pcm_dai_ops,
  

• }

+};

+static struct snd_soc_dai_driver stm32_sai_capture_dai[] = { +{

• .probe = stm32_sai_dai_probe,
  

• .id = 1, /* avoid call to fmt_single_name() */
  

• .capture = {
  

• 	.channels_min = 1,
  

• 	.channels_max = 2,
  

• 	.rate_min = 8000,
  

• 	.rate_max = 192000,
  

• 	.rates = SNDRV_PCM_RATE_CONTINUOUS,
  

• 	/* DMA does not support 24 bits transfers */
  

• 	.formats =
  

• 		SNDRV_PCM_FMTBIT_S8 |
  

• 		SNDRV_PCM_FMTBIT_S16_LE |
  

• 		SNDRV_PCM_FMTBIT_S32_LE,
  

• },
  

• .ops = &stm32_sai_pcm_dai_ops,
  

• }

+};

+static const struct snd_dmaengine_pcm_config stm32_sai_pcm_config = {

• .pcm_hardware = &stm32_sai_pcm_hw,
• .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,

+};

+static const struct snd_soc_component_driver stm32_component = {

• .name = "stm32-sai",

+};

+static const struct of_device_id stm32_sai_sub_ids[] = {

• { .compatible = "st,stm32-sai-sub-a",

•  .data = (void *)STM_SAI_A_ID},
  

• { .compatible = "st,stm32-sai-sub-b",

•  .data = (void *)STM_SAI_B_ID},
  

• {}

+}; +MODULE_DEVICE_TABLE(of, stm32_sai_sub_ids);

+static int stm32_sai_sub_parse_of(struct platform_device *pdev,

• 		  struct stm32_sai_sub_data *sai)
  

+{

• struct device_node *np = pdev->dev.of_node;
• struct resource *res;
• void __iomem *base;
• if (!np)

• return -ENODEV;
  

• res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
• dev_err(&pdev->dev, "res %pr\n", res);

should be dev_dbg() or removed?

• base = devm_ioremap_resource(&pdev->dev, res);
• if (IS_ERR(base))

• return PTR_ERR(base);
  

• sai->phys_addr = res->start;
• sai->regmap = devm_regmap_init_mmio(&pdev->dev, base,

• 			    &stm32_sai_sub_regmap_config);
  

• /* Get direction property */
• if (of_property_match_string(np, "dma-names", "tx") >= 0) {

• sai->dir = SNDRV_PCM_STREAM_PLAYBACK;
  

• } else if (of_property_match_string(np, "dma-names", "rx") >= 0) {

• sai->dir = SNDRV_PCM_STREAM_CAPTURE;
  

• } else {

• dev_err(&pdev->dev, "Unsupported direction\n");
  

• return -EINVAL;
  

• }
• sai->sai_ck = devm_clk_get(&pdev->dev, "sai_ck");
• if (IS_ERR(sai->sai_ck)) {

• dev_err(&pdev->dev, "missing kernel clock sai_ck\n");
  

• return PTR_ERR(sai->sai_ck);
  

• }
• return 0;

+}

+static int stm32_sai_sub_dais_init(struct platform_device *pdev,

• 		   struct stm32_sai_sub_data *sai)
  

+{

• sai->cpu_dai_drv = devm_kzalloc(&pdev->dev,

• 			sizeof(struct snd_soc_dai_driver),
  

• 			GFP_KERNEL);
  

• if (!sai->cpu_dai_drv)

• return -ENOMEM;
  

• sai->cpu_dai_drv->name = dev_name(&pdev->dev);
• if (STM_SAI_IS_PLAYBACK(sai)) {

• memcpy(sai->cpu_dai_drv, &stm32_sai_playback_dai,
  

•        sizeof(stm32_sai_playback_dai));
  

• sai->cpu_dai_drv->playback.stream_name = sai->cpu_dai_drv->name;
  

• } else {

• memcpy(sai->cpu_dai_drv, &stm32_sai_capture_dai,
  

•        sizeof(stm32_sai_capture_dai));
  

• sai->cpu_dai_drv->capture.stream_name = sai->cpu_dai_drv->name;
  

• }
• return 0;

+}

+static int stm32_sai_sub_probe(struct platform_device *pdev) +{

• struct stm32_sai_sub_data *sai;
• const struct of_device_id *of_id;
• int ret;
• sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
• if (!sai)

• return -ENOMEM;
  

• of_id = of_match_device(stm32_sai_sub_ids, &pdev->dev);
• if (!of_id)

• return -EINVAL;
  

• sai->id = (uintptr_t)of_id->data;
• sai->pdev = pdev;
• platform_set_drvdata(pdev, sai);
• sai->pdata = dev_get_drvdata(pdev->dev.parent);
• if (!sai->pdata) {

• dev_err(&pdev->dev, "Parent device data not available\n");
  

• return -EINVAL;
  

• }
• ret = stm32_sai_sub_parse_of(pdev, sai);
• if (ret)

• return ret;
  

• ret = stm32_sai_sub_dais_init(pdev, sai);
• if (ret)

• return ret;
  

• ret = devm_request_irq(&pdev->dev, sai->pdata->irq, stm32_sai_isr,

• 	       IRQF_SHARED, dev_name(&pdev->dev), sai);
  

• if (ret) {

• dev_err(&pdev->dev, "irq request returned %d\n", ret);
  

• return ret;
  

• }
• ret = devm_snd_soc_register_component(&pdev->dev, &stm32_component,

• 			      sai->cpu_dai_drv, 1);
  

• if (ret)

• return ret;
  

• ret = devm_snd_dmaengine_pcm_register(&pdev->dev,

• 			      &stm32_sai_pcm_config, 0);
  

• if (ret) {

• dev_err(&pdev->dev, "could not register pcm dma\n");
  

• return ret;
  

• }
• return 0;

+}

+static struct platform_driver stm32_sai_sub_driver = {

• .driver = {

• .name = "st,stm32-sai-sub",
  

• .of_match_table = stm32_sai_sub_ids,
  

• },
• .probe = stm32_sai_sub_probe,

+};

+module_platform_driver(stm32_sai_sub_driver);

+MODULE_DESCRIPTION("STM32 Soc SAI sub-block Interface"); +MODULE_AUTHOR("Olivier Moysan, olivier.moysan@st.com");

, after name?

+MODULE_ALIAS("platform:st,stm32-sai-sub"); +MODULE_LICENSE("GPL v2");