This patch adds a driver for the DAI interface found on Cirrus Logic CLPS711X family CPUs.

Signed-off-by: Alexander Shiyan shc_work@mail.ru --- sound/soc/cirrus/Kconfig | 8 + sound/soc/cirrus/Makefile | 5 + sound/soc/cirrus/clps711x-dai.c | 506 ++++++++++++++++++++++++++++++++++++++++ sound/soc/cirrus/clps711x-dai.h | 61 +++++ sound/soc/cirrus/clps711x-fiq.S | 56 +++++ 5 files changed, 636 insertions(+) create mode 100644 sound/soc/cirrus/clps711x-dai.c create mode 100644 sound/soc/cirrus/clps711x-dai.h create mode 100644 sound/soc/cirrus/clps711x-fiq.S

diff --git a/sound/soc/cirrus/Kconfig b/sound/soc/cirrus/Kconfig index 5477c54..3c8d040 100644 --- a/sound/soc/cirrus/Kconfig +++ b/sound/soc/cirrus/Kconfig @@ -1,3 +1,11 @@ +config SND_CLPS711X_SOC + tristate "SoC Audio support for the Cirrus Logic CLPS711X CPUs" + depends on ARCH_CLPS711X || (ARM && COMPILE_TEST) + select FIQ + help + Say Y or M if you want to add support for codecs attached to + the CLPS711X DAI interface. + config SND_EP93XX_SOC tristate "SoC Audio support for the Cirrus Logic EP93xx series" depends on ARCH_EP93XX || COMPILE_TEST diff --git a/sound/soc/cirrus/Makefile b/sound/soc/cirrus/Makefile index 5514146..f5d72fc 100644 --- a/sound/soc/cirrus/Makefile +++ b/sound/soc/cirrus/Makefile @@ -1,3 +1,8 @@ +# CLPS711X Platform Support +snd-soc-clps711x-objs := clps711x-dai.o clps711x-fiq.o + +obj-$(CONFIG_SND_CLPS711X_SOC) += snd-soc-clps711x.o + # EP93xx Platform Support snd-soc-ep93xx-objs := ep93xx-pcm.o snd-soc-ep93xx-i2s-objs := ep93xx-i2s.o diff --git a/sound/soc/cirrus/clps711x-dai.c b/sound/soc/cirrus/clps711x-dai.c new file mode 100644 index 0000000..ed677c8 --- /dev/null +++ b/sound/soc/cirrus/clps711x-dai.c @@ -0,0 +1,506 @@ +/* + * Currus Logic CLPS711X DAI driver + * + * Copyright (C) 2014 Alexander Shiyan shc_work@mail.ru + * + * 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/clk.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#include <linux/mfd/syscon.h> +#include <linux/mfd/syscon/clps711x.h> + +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> + +#include <asm/fiq.h> + +#include "clps711x-dai.h" + +#define CLPS711X_FMTS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE) +#define CLPS711X_RATES (SNDRV_PCM_RATE_8000_48000) + +struct clps711x_dai { + u32 head; + u32 last_ptr; + + struct hrtimer hrt; + unsigned long reload; + + unsigned long pll_hz; + unsigned long ext_hz; + + void __iomem *base; + int irq; + + struct pt_regs regs; + struct fiq_handler fiq; + atomic_t running; + + struct snd_pcm_substream *substream; +}; + +static int clps711x_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) +{ + if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) != SND_SOC_DAIFMT_LEFT_J) + return -EINVAL; + + if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) + return -EINVAL; + + if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF) + return -EINVAL; + + return 0; +} + +static int clps711x_dai_set_sysclk(struct snd_soc_dai *dai, int clk_id, + unsigned int freq, int dir) +{ + struct clps711x_dai *s = dev_get_drvdata(dai->dev); + + s->ext_hz = freq; + + return 0; +} + +static int clps711x_dai_update_best_err(unsigned int clk, unsigned int div, + unsigned int rate, int *besterr) +{ + int err = abs(DIV_ROUND_CLOSEST(clk, div) - rate); + + if ((*besterr < 0) || (*besterr > err)) { + *besterr = err; + return 0; + } + + return 1; +} + +static int clps711x_dai_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + struct clps711x_dai *s = dev_get_drvdata(dai->dev); + int i, besterr = -1; + u32 dai64 = 0; + + if ((params_rate(params) < 8000) || (params_rate(params) > 48000)) + return -EINVAL; + + if (!s->pll_hz && !s->ext_hz) + return -EINVAL; + + /* Find best settings for desired samplerate */ + for (i = 0x01; (i < 0x80) && besterr && s->pll_hz; i++) + if (!clps711x_dai_update_best_err(s->pll_hz, 128 * i, + params_rate(params), + &besterr)) + dai64 = DAI64FS_AUDIV(i); + for (i = 0x01; (i < 0x80) && besterr && s->ext_hz; i++) + if (!clps711x_dai_update_best_err(s->ext_hz, 128 * i, + params_rate(params), + &besterr)) + dai64 = DAI64FS_AUDIV(i) | DAI64FS_AUDIOCLKSRC; + + writel(DAI64FS_I2SF64 | DAI64FS_AUDIOCLKEN | DAI64FS_MCLK256EN | dai64, + s->base + DAI64FS); + + return 0; +} + +static const struct snd_soc_dai_ops clps711x_dai_ops = { + .hw_params = clps711x_dai_hw_params, + .set_fmt = clps711x_dai_set_fmt, + .set_sysclk = clps711x_dai_set_sysclk, +}; + +static int clps711x_dai_probe(struct snd_soc_dai *dai) +{ + struct clps711x_dai *s = dev_get_drvdata(dai->dev); + + snd_soc_dai_set_drvdata(dai, s); + + return 0; +} + +static struct snd_soc_dai_driver clps711x_dai_driver = { + .ops = &clps711x_dai_ops, + .probe = clps711x_dai_probe, + .playback = { + .stream_name = "Playback", + .formats = CLPS711X_FMTS, + .rates = CLPS711X_RATES, + .channels_min = 2, + .channels_max = 2, + }, +}; + +static const struct snd_soc_component_driver clps711x_i2s_component = { + .name = "clps711x-i2s", +}; + +static int clps711x_pcm_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct clps711x_dai *dai = snd_soc_platform_get_drvdata(rtd->platform); + int ret; + + ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); + if (ret < 0) + return ret; + + dai->substream = substream; + dai->reload = (1000000000 / params_rate(params)) * + params_period_size(params) / 2; + + local_fiq_disable(); + get_fiq_regs(&dai->regs); + dai->regs.ARM_r8 = (u32)substream->runtime->dma_area; + set_fiq_regs(&dai->regs); + local_fiq_enable(); + + return 0; +} + +static int clps711x_pcm_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct clps711x_dai *dai = snd_soc_platform_get_drvdata(rtd->platform); + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + atomic_set(&dai->running, 1); + hrtimer_start(&dai->hrt, ns_to_ktime(dai->reload), + HRTIMER_MODE_REL); + break; + case SNDRV_PCM_TRIGGER_STOP: + atomic_set(&dai->running, 0); + break; + default: + return -EINVAL; + } + + return 0; +} + +static snd_pcm_uframes_t clps711x_pcm_ptr(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct clps711x_dai *dai = snd_soc_platform_get_drvdata(rtd->platform); + + return bytes_to_frames(substream->runtime, dai->last_ptr); +} + +static int clps711x_pcm_copy(struct snd_pcm_substream *substream, int channel, + snd_pcm_uframes_t pos, void __user *buf, + snd_pcm_uframes_t count) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct clps711x_dai *dai = snd_soc_platform_get_drvdata(rtd->platform); + int sz = frames_to_bytes(substream->runtime, count); + + if (copy_from_user(substream->runtime->dma_area + dai->head, buf, sz)) + return -EFAULT; + + local_fiq_disable(); + dai->head += sz; + dai->head %= CLPS711X_SNDBUF_SIZE; + local_fiq_enable(); + + return 0; +} + +static int clps711x_pcm_silence(struct snd_pcm_substream *substream, + int channel, snd_pcm_uframes_t pos, + snd_pcm_uframes_t count) +{ + /* Silence is provided in the FIQ interrupt routine */ + /* This empty function is necessary */ + return 0; +} + +static enum hrtimer_restart clps711x_pcm_timer(struct hrtimer *hrt) +{ + struct clps711x_dai *dai = container_of(hrt, struct clps711x_dai, hrt); + u32 delta; + + if (!atomic_read(&dai->running)) { + dai->head = 0; + dai->last_ptr = 0; + + local_fiq_disable(); + get_fiq_regs(&dai->regs); + dai->regs.ARM_r10 = 0; + set_fiq_regs(&dai->regs); + local_fiq_enable(); + + return HRTIMER_NORESTART; + } + + get_fiq_regs(&dai->regs); + + delta = CLPS711X_SNDBUF_SIZE + dai->regs.ARM_r10 - dai->last_ptr; + delta %= CLPS711X_SNDBUF_SIZE; + if ((delta >= dai->substream->runtime->period_size) || + (dai->regs.ARM_r10 == dai->head)) { + dai->last_ptr = dai->regs.ARM_r10; + snd_pcm_period_elapsed(dai->substream); + } + + hrtimer_forward_now(hrt, ns_to_ktime(dai->reload)); + + return HRTIMER_RESTART; +} + +static const struct snd_pcm_hardware clps711x_pcm_hardware = { + .info = SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_BLOCK_TRANSFER, + .formats = CLPS711X_FMTS, + .buffer_bytes_max = CLPS711X_SNDBUF_SIZE, + .period_bytes_min = 32, + .period_bytes_max = CLPS711X_SNDBUF_SIZE / 8, + .periods_min = 4, + .periods_max = CLPS711X_SNDBUF_SIZE / 64 - 1, +}; + +static int clps711x_pcm_open(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct clps711x_dai *dai = snd_soc_platform_get_drvdata(rtd->platform); + int ret; + + atomic_set(&dai->running, 0); + hrtimer_init(&dai->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + dai->hrt.function = clps711x_pcm_timer; + + dai->head = 0; + dai->last_ptr = 0; + + get_fiq_regs(&dai->regs); + dai->regs.ARM_r9 = (u32)&dai->head; + dai->regs.ARM_r10 = 0; + dai->regs.ARM_fp = (u32)dai->base; + set_fiq_regs(&dai->regs); + + enable_irq(dai->irq); + + ret = snd_pcm_hw_constraint_integer(substream->runtime, + SNDRV_PCM_HW_PARAM_PERIODS); + if (ret < 0) + return ret; + + return snd_soc_set_runtime_hwparams(substream, &clps711x_pcm_hardware); +} + +static int clps711x_pcm_close(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct clps711x_dai *dai = snd_soc_platform_get_drvdata(rtd->platform); + + disable_irq(dai->irq); + hrtimer_cancel(&dai->hrt); + + return 0; +} + +static const struct snd_pcm_ops clps711x_pcm_ops = { + .open = clps711x_pcm_open, + .close = clps711x_pcm_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = clps711x_pcm_hw_params, + .hw_free = snd_pcm_lib_free_pages, + .trigger = clps711x_pcm_trigger, + .pointer = clps711x_pcm_ptr, + .copy = clps711x_pcm_copy, + .silence = clps711x_pcm_silence, +}; + +static int clps711x_pcm_new(struct snd_soc_pcm_runtime *rtd) +{ + struct clps711x_dai *dai = snd_soc_platform_get_drvdata(rtd->platform); + const char *devname = dev_name(rtd->platform->dev); + int ret; + + /* Request FIQ */ + dai->fiq.name = devname; + ret = claim_fiq(&dai->fiq); + if (ret) + return ret; + + /* Request FIQ interrupt */ + ret = request_irq(dai->irq, no_action, 0, devname, NULL); + if (ret) + return ret; + + /* Install FIQ handler */ + set_fiq_handler(&daifiq_start, &daifiq_end - &daifiq_start); + + return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm, + SNDRV_DMA_TYPE_CONTINUOUS, snd_dma_continuous_data(GFP_KERNEL), + CLPS711X_SNDBUF_SIZE, CLPS711X_SNDBUF_SIZE); +} + +static void clps711x_pcm_free(struct snd_pcm *pcm) +{ + struct snd_soc_pcm_runtime *rtd = pcm->private_data; + struct clps711x_dai *dai = snd_soc_platform_get_drvdata(rtd->platform); + + free_irq(dai->irq, NULL); + + release_fiq(&dai->fiq); + + snd_pcm_lib_preallocate_free_for_all(pcm); +} + +static struct snd_soc_platform_driver clps711x_soc_platform_drv = { + .ops = &clps711x_pcm_ops, + .pcm_new = clps711x_pcm_new, + .pcm_free = clps711x_pcm_free, +}; + +static int clps711x_enable_fifo(void __iomem *base, u32 channel) +{ + unsigned long timeout; + + writel(DAIDR2_FIFOEN | channel, base + DAIDR2); + timeout = jiffies + msecs_to_jiffies(5); + while (!(readl(base + DAISR) & DAISR_FIFO)) + if (time_is_before_jiffies(timeout)) + return -ETIMEDOUT; + + return 0; +} + +static int clps711x_dai_platform_probe(struct platform_device *pdev) +{ + u32 dai64 = DAI64FS_AUDIOCLKEN | DAI64FS_MCLK256EN | DAI64FS_I2SF64; + struct device *dev = &pdev->dev; + struct clps711x_dai *dai; + struct regmap *syscon; + struct resource *res; + struct clk *clk; + int ret; + + /* Check for proper buffer size */ + BUG_ON(!is_power_of_2(CLPS711X_SNDBUF_SIZE)); + + dai = devm_kzalloc(dev, sizeof(*dai), GFP_KERNEL); + if (!dai) + return -ENOMEM; + + dai->irq = platform_get_irq(pdev, 0); + if (dai->irq < 0) + return dai->irq; + + syscon = syscon_regmap_lookup_by_compatible("cirrus,clps711x-syscon3"); + if (IS_ERR(syscon)) + return PTR_ERR(syscon); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + dai->base = devm_ioremap_resource(dev, res); + if (IS_ERR(dai->base)) + return PTR_ERR(dai->base); + + clk = devm_clk_get(dev, "pll"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + dai->pll_hz = clk_get_rate(clk) / 2; + if (!dai->pll_hz) { + dai64 |= DAI64FS_AUDIOCLKSRC; + dev_notice(dev, "External MCLK will be used only\n"); + } + + clk = devm_clk_get(dev, "mclk"); + if (IS_ERR(clk)) { + if (PTR_ERR(clk) == -EPROBE_DEFER) + return -EPROBE_DEFER; + } else + dai->ext_hz = clk_get_rate(clk); + + platform_set_drvdata(pdev, dai); + + ret = devm_snd_soc_register_component(dev, &clps711x_i2s_component, + &clps711x_dai_driver, 1); + if (ret) + return ret; + + /* Enable DAI interface */ + regmap_update_bits(syscon, SYSCON_OFFSET, + SYSCON3_DAISEL | SYSCON3_128FS, SYSCON3_DAISEL); + + /* Clear interrupt flags */ + writel(~0, dai->base + DAISR); + + /* Enable DAI */ + writel(DAIR_RESERVED | DAIR_DAIEN | DAIR_ECS | DAIR_LCTM | DAIR_RCTM, + dai->base + DAIR); + + /* Set initial value to DAI register */ + writel(dai64 | DAI64FS_AUDIV(10), dai->base + DAI64FS); + + /* Enable FIFOs */ + ret = clps711x_enable_fifo(dai->base, DAIDR2_FIFOLEFT); + if (ret) + goto out_err; + ret = clps711x_enable_fifo(dai->base, DAIDR2_FIFORIGHT); + if (ret) + goto out_err; + + ret = snd_soc_register_platform(dev, &clps711x_soc_platform_drv); + if (!ret) + return 0; + +out_err: + /* Disable DAI */ + writel(DAIR_RESERVED, dai->base + DAIR); + + return ret; +} + +static int clps711x_dai_platform_remove(struct platform_device *pdev) +{ + struct clps711x_dai *dai = platform_get_drvdata(pdev); + + /* Disable DAI */ + writel(DAIR_RESERVED, dai->base + DAIR); + + snd_soc_unregister_platform(&pdev->dev); + + return 0; +} + +static const struct of_device_id clps711x_dai_dt_ids[] = { + { .compatible = "cirrus,clps711x-dai", }, + { } +}; +MODULE_DEVICE_TABLE(of, clps711x_dai_dt_ids); + +static struct platform_driver clps711x_dai_platform_driver = { + .driver = { + .name = "clps711x-dai", + .owner = THIS_MODULE, + .of_match_table = clps711x_dai_dt_ids, + }, + .probe = clps711x_dai_platform_probe, + .remove = clps711x_dai_platform_remove, +}; +module_platform_driver(clps711x_dai_platform_driver); + +MODULE_AUTHOR("Alexander Shiyan shc_work@mail.ru"); +MODULE_DESCRIPTION("CLPS711X DAI driver"); +MODULE_LICENSE("GPL"); diff --git a/sound/soc/cirrus/clps711x-dai.h b/sound/soc/cirrus/clps711x-dai.h new file mode 100644 index 0000000..c79d26a --- /dev/null +++ b/sound/soc/cirrus/clps711x-dai.h @@ -0,0 +1,61 @@ +/* + * Currus Logic CLPS711X DAI definitions + * + * Copyright (C) 2014 Alexander Shiyan shc_work@mail.ru + * + * 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 __CLPS711X_DAI_H +#define __CLPS711X_DAI_H + +#include <linux/sizes.h> + +#define CLPS711X_SNDBUF_SIZE SZ_128K + +#define DAIR (0x0000) +# define DAIR_RESERVED (0x0404) +# define DAIR_DAIEN (1 << 16) +# define DAIR_ECS (1 << 17) +# define DAIR_LCTM (1 << 19) +# define DAIR_LCRM (1 << 20) +# define DAIR_RCTM (1 << 21) +# define DAIR_RCRM (1 << 22) +# define DAIR_LBM (1 << 23) +#define DAIDR0 (0x0040) +#define DAIDR1 (0x0080) +#define DAIDR2 (0x00c0) +# define DAIDR2_FIFOEN (1 << 15) +# define DAIDR2_FIFOLEFT (0x0d << 16) +# define DAIDR2_FIFORIGHT (0x11 << 16) +#define DAISR (0x0100) +# define DAISR_RCTS (1 << 0) +# define DAISR_RCRS (1 << 1) +# define DAISR_LCTS (1 << 2) +# define DAISR_LCRS (1 << 3) +# define DAISR_RCTU (1 << 4) +# define DAISR_RCRO (1 << 5) +# define DAISR_LCTU (1 << 6) +# define DAISR_LCRO (1 << 7) +# define DAISR_RCNF (1 << 8) +# define DAISR_RCNE (1 << 9) +# define DAISR_LCNF (1 << 10) +# define DAISR_LCNE (1 << 11) +# define DAISR_FIFO (1 << 12) +#define DAI64FS (0x0600) +# define DAI64FS_I2SF64 (1 << 0) +# define DAI64FS_AUDIOCLKEN (1 << 1) +# define DAI64FS_AUDIOCLKSRC (1 << 2) +# define DAI64FS_MCLK256EN (1 << 3) +# define DAI64FS_LOOPBACK (1 << 5) +# define DAI64FS_AUDIV_MASK (0x7f00) +# define DAI64FS_AUDIV(x) (((x) << 8) & DAI64FS_AUDIV_MASK) + +#ifndef __ASSEMBLY__ +extern unsigned char daifiq_start, daifiq_end; +#endif + +#endif diff --git a/sound/soc/cirrus/clps711x-fiq.S b/sound/soc/cirrus/clps711x-fiq.S new file mode 100644 index 0000000..aa2dfb9 --- /dev/null +++ b/sound/soc/cirrus/clps711x-fiq.S @@ -0,0 +1,56 @@ +/* + * Currus Logic CLPS711X DAI FIQ Handler + * + * Copyright (C) 2014 Alexander Shiyan shc_work@mail.ru + * + * 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 <asm/assembler.h> +#include <linux/linkage.h> + +#include "clps711x-dai.h" + + .text + .arm + + .global daifiq_end + +ENTRY(daifiq_start) + @ r8 - Buffer address + @ r9 - Head Pointer + @ r10 - Tail Pointer + @ r11 - Registers base virtual address + # r12 - Temp + +daifiq_loop: + ldr r12, [r9] @ Get Head + subs r12, r12, r10 @ Compare Head & Tail + beq daifiq_play @ Send zeroes if Head = Tail + + ldr r12, [r8, r10] @ Get buffer value + add r10, r10, #4 @ Increment pointer + bic r10, r10, #CLPS711X_SNDBUF_SIZE @ Mask with buffer size + +daifiq_play: + @ Put data to FIFOs + strh r12, [r11, #DAIDR1] @ Left channel + mov r12, r12, lsr #16 + strh r12, [r11, #DAIDR0] @ Right channel + + @ Check DAI Flags (FIFOs not full) + ldr r12, [r11, #DAISR] + and r12, r12, #DAISR_RCNF | DAISR_LCNF + cmp r12, #DAISR_RCNF | DAISR_LCNF + beq daifiq_loop + + @ Clear DAI Interrupt Flags + mvn r12, #0 + str r12, [r11, #DAISR] + + @ Return from FIQ + subs pc, lr, #4 +daifiq_end: