+++ /dev/null
-From ec589c88e88452a80a20ad4ebc90e8fe5d80e7cd Mon Sep 17 00:00:00 2001
-From: Florian Meier <florian.meier@koalo.de>
-Date: Fri, 22 Nov 2013 14:33:38 +0100
-Subject: [PATCH 030/114] ASoC: Add support for BCM2708
-
-This driver adds support for digital audio (I2S)
-for the BCM2708 SoC that is used by the
-Raspberry Pi. External audio codecs can be
-connected to the Raspberry Pi via P5 header.
-
-It relies on cyclic DMA engine support for BCM2708.
-
-Signed-off-by: Florian Meier <florian.meier@koalo.de>
-
-ASoC: BCM2708: Add 24 bit support
-
-This adds 24 bit support to the I2S driver of the BCM2708.
-Besides enabling the 24 bit flags, it includes two bug fixes:
-
-MMAP is not supported. Claiming this leads to strange issues
-when the format of driver and file do not match.
-
-The datasheet states that the width extension bit should be set
-for widths greater than 24, but greater or equal would be correct.
-This follows from the definition of the width field.
-
-Signed-off-by: Florian Meier <florian.meier@koalo.de>
-
-bcm2708-i2s: Update bclk_ratio to more correct values
-
-Move GPIO setup to hw_params.
-
-This is used to stop the I2S driver from breaking
-the GPIO setup for other uses of the PCM interface
-
-Configure GPIOs for I2S based on revision/card settings
-
-With RPi model B+, assignment of the I2S GPIO pins has changed.
-This patch uses the board revision to auto-detect the GPIOs used
-for I2S. It also allows sound card drivers to set the GPIOs that
-should be used. This is especially important with the Compute
-Module.
-
-bcm2708-i2s: Avoid leak from iomap when accessing gpio
-
-bcm2708: Eliminate i2s debugfs directory error
-
-Qualify the two regmap ranges uses by bcm2708-i2s ('-i2s' and '-clk')
-to avoid the name clash when registering debugfs entries.
----
- sound/soc/bcm/Kconfig | 11 +
- sound/soc/bcm/Makefile | 4 +
- sound/soc/bcm/bcm2708-i2s.c | 998 ++++++++++++++++++++++++++++++++++++++++++++
- sound/soc/bcm/bcm2708-i2s.h | 35 ++
- 4 files changed, 1048 insertions(+)
- create mode 100644 sound/soc/bcm/bcm2708-i2s.c
- create mode 100644 sound/soc/bcm/bcm2708-i2s.h
-
---- a/sound/soc/bcm/Kconfig
-+++ b/sound/soc/bcm/Kconfig
-@@ -7,3 +7,14 @@ config SND_BCM2835_SOC_I2S
- Say Y or M if you want to add support for codecs attached to
- the BCM2835 I2S interface. You will also need
- to select the audio interfaces to support below.
-+
-+config SND_BCM2708_SOC_I2S
-+ tristate "SoC Audio support for the Broadcom BCM2708 I2S module"
-+ depends on MACH_BCM2708
-+ select REGMAP_MMIO
-+ select SND_SOC_DMAENGINE_PCM
-+ select SND_SOC_GENERIC_DMAENGINE_PCM
-+ help
-+ Say Y or M if you want to add support for codecs attached to
-+ the BCM2708 I2S interface. You will also need
-+ to select the audio interfaces to support below.
---- a/sound/soc/bcm/Makefile
-+++ b/sound/soc/bcm/Makefile
-@@ -3,3 +3,7 @@ snd-soc-bcm2835-i2s-objs := bcm2835-i2s.
-
- obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd-soc-bcm2835-i2s.o
-
-+# BCM2708 Platform Support
-+snd-soc-bcm2708-i2s-objs := bcm2708-i2s.o
-+
-+obj-$(CONFIG_SND_BCM2708_SOC_I2S) += snd-soc-bcm2708-i2s.o
---- /dev/null
-+++ b/sound/soc/bcm/bcm2708-i2s.c
-@@ -0,0 +1,998 @@
-+/*
-+ * ALSA SoC I2S Audio Layer for Broadcom BCM2708 SoC
-+ *
-+ * Author: Florian Meier <florian.meier@koalo.de>
-+ * Copyright 2013
-+ *
-+ * Based on
-+ * Raspberry Pi PCM I2S ALSA Driver
-+ * Copyright (c) by Phil Poole 2013
-+ *
-+ * ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor
-+ * Vladimir Barinov, <vbarinov@embeddedalley.com>
-+ * Copyright (C) 2007 MontaVista Software, Inc., <source@mvista.com>
-+ *
-+ * OMAP ALSA SoC DAI driver using McBSP port
-+ * Copyright (C) 2008 Nokia Corporation
-+ * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
-+ * Peter Ujfalusi <peter.ujfalusi@ti.com>
-+ *
-+ * Freescale SSI ALSA SoC Digital Audio Interface (DAI) driver
-+ * Author: Timur Tabi <timur@freescale.com>
-+ * Copyright 2007-2010 Freescale Semiconductor, 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 "bcm2708-i2s.h"
-+
-+#include <linux/init.h>
-+#include <linux/module.h>
-+#include <linux/device.h>
-+#include <linux/slab.h>
-+#include <linux/delay.h>
-+#include <linux/io.h>
-+#include <linux/clk.h>
-+#include <mach/gpio.h>
-+
-+#include <sound/core.h>
-+#include <sound/pcm.h>
-+#include <sound/pcm_params.h>
-+#include <sound/initval.h>
-+#include <sound/soc.h>
-+#include <sound/dmaengine_pcm.h>
-+
-+#include <asm/system_info.h>
-+
-+/* Clock registers */
-+#define BCM2708_CLK_PCMCTL_REG 0x00
-+#define BCM2708_CLK_PCMDIV_REG 0x04
-+
-+/* Clock register settings */
-+#define BCM2708_CLK_PASSWD (0x5a000000)
-+#define BCM2708_CLK_PASSWD_MASK (0xff000000)
-+#define BCM2708_CLK_MASH(v) ((v) << 9)
-+#define BCM2708_CLK_FLIP BIT(8)
-+#define BCM2708_CLK_BUSY BIT(7)
-+#define BCM2708_CLK_KILL BIT(5)
-+#define BCM2708_CLK_ENAB BIT(4)
-+#define BCM2708_CLK_SRC(v) (v)
-+
-+#define BCM2708_CLK_SHIFT (12)
-+#define BCM2708_CLK_DIVI(v) ((v) << BCM2708_CLK_SHIFT)
-+#define BCM2708_CLK_DIVF(v) (v)
-+#define BCM2708_CLK_DIVF_MASK (0xFFF)
-+
-+enum {
-+ BCM2708_CLK_MASH_0 = 0,
-+ BCM2708_CLK_MASH_1,
-+ BCM2708_CLK_MASH_2,
-+ BCM2708_CLK_MASH_3,
-+};
-+
-+enum {
-+ BCM2708_CLK_SRC_GND = 0,
-+ BCM2708_CLK_SRC_OSC,
-+ BCM2708_CLK_SRC_DBG0,
-+ BCM2708_CLK_SRC_DBG1,
-+ BCM2708_CLK_SRC_PLLA,
-+ BCM2708_CLK_SRC_PLLC,
-+ BCM2708_CLK_SRC_PLLD,
-+ BCM2708_CLK_SRC_HDMI,
-+};
-+
-+/* Most clocks are not useable (freq = 0) */
-+static const unsigned int bcm2708_clk_freq[BCM2708_CLK_SRC_HDMI+1] = {
-+ [BCM2708_CLK_SRC_GND] = 0,
-+ [BCM2708_CLK_SRC_OSC] = 19200000,
-+ [BCM2708_CLK_SRC_DBG0] = 0,
-+ [BCM2708_CLK_SRC_DBG1] = 0,
-+ [BCM2708_CLK_SRC_PLLA] = 0,
-+ [BCM2708_CLK_SRC_PLLC] = 0,
-+ [BCM2708_CLK_SRC_PLLD] = 500000000,
-+ [BCM2708_CLK_SRC_HDMI] = 0,
-+};
-+
-+/* I2S registers */
-+#define BCM2708_I2S_CS_A_REG 0x00
-+#define BCM2708_I2S_FIFO_A_REG 0x04
-+#define BCM2708_I2S_MODE_A_REG 0x08
-+#define BCM2708_I2S_RXC_A_REG 0x0c
-+#define BCM2708_I2S_TXC_A_REG 0x10
-+#define BCM2708_I2S_DREQ_A_REG 0x14
-+#define BCM2708_I2S_INTEN_A_REG 0x18
-+#define BCM2708_I2S_INTSTC_A_REG 0x1c
-+#define BCM2708_I2S_GRAY_REG 0x20
-+
-+/* I2S register settings */
-+#define BCM2708_I2S_STBY BIT(25)
-+#define BCM2708_I2S_SYNC BIT(24)
-+#define BCM2708_I2S_RXSEX BIT(23)
-+#define BCM2708_I2S_RXF BIT(22)
-+#define BCM2708_I2S_TXE BIT(21)
-+#define BCM2708_I2S_RXD BIT(20)
-+#define BCM2708_I2S_TXD BIT(19)
-+#define BCM2708_I2S_RXR BIT(18)
-+#define BCM2708_I2S_TXW BIT(17)
-+#define BCM2708_I2S_CS_RXERR BIT(16)
-+#define BCM2708_I2S_CS_TXERR BIT(15)
-+#define BCM2708_I2S_RXSYNC BIT(14)
-+#define BCM2708_I2S_TXSYNC BIT(13)
-+#define BCM2708_I2S_DMAEN BIT(9)
-+#define BCM2708_I2S_RXTHR(v) ((v) << 7)
-+#define BCM2708_I2S_TXTHR(v) ((v) << 5)
-+#define BCM2708_I2S_RXCLR BIT(4)
-+#define BCM2708_I2S_TXCLR BIT(3)
-+#define BCM2708_I2S_TXON BIT(2)
-+#define BCM2708_I2S_RXON BIT(1)
-+#define BCM2708_I2S_EN (1)
-+
-+#define BCM2708_I2S_CLKDIS BIT(28)
-+#define BCM2708_I2S_PDMN BIT(27)
-+#define BCM2708_I2S_PDME BIT(26)
-+#define BCM2708_I2S_FRXP BIT(25)
-+#define BCM2708_I2S_FTXP BIT(24)
-+#define BCM2708_I2S_CLKM BIT(23)
-+#define BCM2708_I2S_CLKI BIT(22)
-+#define BCM2708_I2S_FSM BIT(21)
-+#define BCM2708_I2S_FSI BIT(20)
-+#define BCM2708_I2S_FLEN(v) ((v) << 10)
-+#define BCM2708_I2S_FSLEN(v) (v)
-+
-+#define BCM2708_I2S_CHWEX BIT(15)
-+#define BCM2708_I2S_CHEN BIT(14)
-+#define BCM2708_I2S_CHPOS(v) ((v) << 4)
-+#define BCM2708_I2S_CHWID(v) (v)
-+#define BCM2708_I2S_CH1(v) ((v) << 16)
-+#define BCM2708_I2S_CH2(v) (v)
-+
-+#define BCM2708_I2S_TX_PANIC(v) ((v) << 24)
-+#define BCM2708_I2S_RX_PANIC(v) ((v) << 16)
-+#define BCM2708_I2S_TX(v) ((v) << 8)
-+#define BCM2708_I2S_RX(v) (v)
-+
-+#define BCM2708_I2S_INT_RXERR BIT(3)
-+#define BCM2708_I2S_INT_TXERR BIT(2)
-+#define BCM2708_I2S_INT_RXR BIT(1)
-+#define BCM2708_I2S_INT_TXW BIT(0)
-+
-+/* I2S DMA interface */
-+#define BCM2708_I2S_FIFO_PHYSICAL_ADDR 0x7E203004
-+#define BCM2708_DMA_DREQ_PCM_TX 2
-+#define BCM2708_DMA_DREQ_PCM_RX 3
-+
-+/* I2S pin configuration */
-+static int bcm2708_i2s_gpio=BCM2708_I2S_GPIO_AUTO;
-+
-+/* General device struct */
-+struct bcm2708_i2s_dev {
-+ struct device *dev;
-+ struct snd_dmaengine_dai_dma_data dma_data[2];
-+ unsigned int fmt;
-+ unsigned int bclk_ratio;
-+
-+ struct regmap *i2s_regmap;
-+ struct regmap *clk_regmap;
-+};
-+
-+void bcm2708_i2s_set_gpio(int gpio) {
-+ bcm2708_i2s_gpio=gpio;
-+}
-+EXPORT_SYMBOL(bcm2708_i2s_set_gpio);
-+
-+
-+static void bcm2708_i2s_start_clock(struct bcm2708_i2s_dev *dev)
-+{
-+ /* Start the clock if in master mode */
-+ unsigned int master = dev->fmt & SND_SOC_DAIFMT_MASTER_MASK;
-+
-+ switch (master) {
-+ case SND_SOC_DAIFMT_CBS_CFS:
-+ case SND_SOC_DAIFMT_CBS_CFM:
-+ regmap_update_bits(dev->clk_regmap, BCM2708_CLK_PCMCTL_REG,
-+ BCM2708_CLK_PASSWD_MASK | BCM2708_CLK_ENAB,
-+ BCM2708_CLK_PASSWD | BCM2708_CLK_ENAB);
-+ break;
-+ default:
-+ break;
-+ }
-+}
-+
-+static void bcm2708_i2s_stop_clock(struct bcm2708_i2s_dev *dev)
-+{
-+ uint32_t clkreg;
-+ int timeout = 1000;
-+
-+ /* Stop clock */
-+ regmap_update_bits(dev->clk_regmap, BCM2708_CLK_PCMCTL_REG,
-+ BCM2708_CLK_PASSWD_MASK | BCM2708_CLK_ENAB,
-+ BCM2708_CLK_PASSWD);
-+
-+ /* Wait for the BUSY flag going down */
-+ while (--timeout) {
-+ regmap_read(dev->clk_regmap, BCM2708_CLK_PCMCTL_REG, &clkreg);
-+ if (!(clkreg & BCM2708_CLK_BUSY))
-+ break;
-+ }
-+
-+ if (!timeout) {
-+ /* KILL the clock */
-+ dev_err(dev->dev, "I2S clock didn't stop. Kill the clock!\n");
-+ regmap_update_bits(dev->clk_regmap, BCM2708_CLK_PCMCTL_REG,
-+ BCM2708_CLK_KILL | BCM2708_CLK_PASSWD_MASK,
-+ BCM2708_CLK_KILL | BCM2708_CLK_PASSWD);
-+ }
-+}
-+
-+static void bcm2708_i2s_clear_fifos(struct bcm2708_i2s_dev *dev,
-+ bool tx, bool rx)
-+{
-+ int timeout = 1000;
-+ uint32_t syncval;
-+ uint32_t csreg;
-+ uint32_t i2s_active_state;
-+ uint32_t clkreg;
-+ uint32_t clk_active_state;
-+ uint32_t off;
-+ uint32_t clr;
-+
-+ off = tx ? BCM2708_I2S_TXON : 0;
-+ off |= rx ? BCM2708_I2S_RXON : 0;
-+
-+ clr = tx ? BCM2708_I2S_TXCLR : 0;
-+ clr |= rx ? BCM2708_I2S_RXCLR : 0;
-+
-+ /* Backup the current state */
-+ regmap_read(dev->i2s_regmap, BCM2708_I2S_CS_A_REG, &csreg);
-+ i2s_active_state = csreg & (BCM2708_I2S_RXON | BCM2708_I2S_TXON);
-+
-+ regmap_read(dev->clk_regmap, BCM2708_CLK_PCMCTL_REG, &clkreg);
-+ clk_active_state = clkreg & BCM2708_CLK_ENAB;
-+
-+ /* Start clock if not running */
-+ if (!clk_active_state) {
-+ regmap_update_bits(dev->clk_regmap, BCM2708_CLK_PCMCTL_REG,
-+ BCM2708_CLK_PASSWD_MASK | BCM2708_CLK_ENAB,
-+ BCM2708_CLK_PASSWD | BCM2708_CLK_ENAB);
-+ }
-+
-+ /* Stop I2S module */
-+ regmap_update_bits(dev->i2s_regmap, BCM2708_I2S_CS_A_REG, off, 0);
-+
-+ /*
-+ * Clear the FIFOs
-+ * Requires at least 2 PCM clock cycles to take effect
-+ */
-+ regmap_update_bits(dev->i2s_regmap, BCM2708_I2S_CS_A_REG, clr, clr);
-+
-+ /* Wait for 2 PCM clock cycles */
-+
-+ /*
-+ * Toggle the SYNC flag. After 2 PCM clock cycles it can be read back
-+ * FIXME: This does not seem to work for slave mode!
-+ */
-+ regmap_read(dev->i2s_regmap, BCM2708_I2S_CS_A_REG, &syncval);
-+ syncval &= BCM2708_I2S_SYNC;
-+
-+ regmap_update_bits(dev->i2s_regmap, BCM2708_I2S_CS_A_REG,
-+ BCM2708_I2S_SYNC, ~syncval);
-+
-+ /* Wait for the SYNC flag changing it's state */
-+ while (--timeout) {
-+ regmap_read(dev->i2s_regmap, BCM2708_I2S_CS_A_REG, &csreg);
-+ if ((csreg & BCM2708_I2S_SYNC) != syncval)
-+ break;
-+ }
-+
-+ if (!timeout)
-+ dev_err(dev->dev, "I2S SYNC error!\n");
-+
-+ /* Stop clock if it was not running before */
-+ if (!clk_active_state)
-+ bcm2708_i2s_stop_clock(dev);
-+
-+ /* Restore I2S state */
-+ regmap_update_bits(dev->i2s_regmap, BCM2708_I2S_CS_A_REG,
-+ BCM2708_I2S_RXON | BCM2708_I2S_TXON, i2s_active_state);
-+}
-+
-+static int bcm2708_i2s_set_dai_fmt(struct snd_soc_dai *dai,
-+ unsigned int fmt)
-+{
-+ struct bcm2708_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
-+ dev->fmt = fmt;
-+ return 0;
-+}
-+
-+static int bcm2708_i2s_set_dai_bclk_ratio(struct snd_soc_dai *dai,
-+ unsigned int ratio)
-+{
-+ struct bcm2708_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
-+ dev->bclk_ratio = ratio;
-+ return 0;
-+}
-+
-+
-+static int bcm2708_i2s_set_function(unsigned offset, int function)
-+{
-+ #define GPIOFSEL(x) (0x00+(x)*4)
-+ void __iomem *gpio = __io_address(GPIO_BASE);
-+ unsigned alt = function <= 3 ? function + 4: function == 4 ? 3 : 2;
-+ unsigned gpiodir;
-+ unsigned gpio_bank = offset / 10;
-+ unsigned gpio_field_offset = (offset - 10 * gpio_bank) * 3;
-+
-+ if (offset >= BCM2708_NR_GPIOS)
-+ return -EINVAL;
-+
-+ gpiodir = readl(gpio + GPIOFSEL(gpio_bank));
-+ gpiodir &= ~(7 << gpio_field_offset);
-+ gpiodir |= alt << gpio_field_offset;
-+ writel(gpiodir, gpio + GPIOFSEL(gpio_bank));
-+ return 0;
-+}
-+
-+static void bcm2708_i2s_setup_gpio(void)
-+{
-+ /*
-+ * This is the common way to handle the GPIO pins for
-+ * the Raspberry Pi.
-+ * TODO Better way would be to handle
-+ * this in the device tree!
-+ */
-+ int pin,pinconfig,startpin,alt;
-+
-+ /* SPI is on different GPIOs on different boards */
-+ /* for Raspberry Pi B+, this is pin GPIO18-21, for original on 28-31 */
-+ if (bcm2708_i2s_gpio==BCM2708_I2S_GPIO_AUTO) {
-+ if ((system_rev & 0xffffff) >= 0x10) {
-+ /* Model B+ */
-+ pinconfig=BCM2708_I2S_GPIO_PIN18;
-+ } else {
-+ /* original */
-+ pinconfig=BCM2708_I2S_GPIO_PIN28;
-+ }
-+ } else {
-+ pinconfig=bcm2708_i2s_gpio;
-+ }
-+
-+ if (pinconfig==BCM2708_I2S_GPIO_PIN18) {
-+ startpin=18;
-+ alt=BCM2708_I2S_GPIO_PIN18_ALT;
-+ } else if (pinconfig==BCM2708_I2S_GPIO_PIN28) {
-+ startpin=28;
-+ alt=BCM2708_I2S_GPIO_PIN28_ALT;
-+ } else {
-+ printk(KERN_INFO "Can't configure I2S GPIOs, unknown pin mode for I2S: %i\n",pinconfig);
-+ return;
-+ }
-+
-+ /* configure I2S pins to correct ALT mode */
-+ for (pin = startpin; pin <= startpin+3; pin++) {
-+ bcm2708_i2s_set_function(pin, alt);
-+ }
-+}
-+
-+static int bcm2708_i2s_hw_params(struct snd_pcm_substream *substream,
-+ struct snd_pcm_hw_params *params,
-+ struct snd_soc_dai *dai)
-+{
-+ struct bcm2708_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
-+
-+ unsigned int sampling_rate = params_rate(params);
-+ unsigned int data_length, data_delay, bclk_ratio;
-+ unsigned int ch1pos, ch2pos, mode, format;
-+ unsigned int mash = BCM2708_CLK_MASH_1;
-+ unsigned int divi, divf, target_frequency;
-+ int clk_src = -1;
-+ unsigned int master = dev->fmt & SND_SOC_DAIFMT_MASTER_MASK;
-+ bool bit_master = (master == SND_SOC_DAIFMT_CBS_CFS
-+ || master == SND_SOC_DAIFMT_CBS_CFM);
-+
-+ bool frame_master = (master == SND_SOC_DAIFMT_CBS_CFS
-+ || master == SND_SOC_DAIFMT_CBM_CFS);
-+ uint32_t csreg;
-+
-+ /*
-+ * If a stream is already enabled,
-+ * the registers are already set properly.
-+ */
-+ regmap_read(dev->i2s_regmap, BCM2708_I2S_CS_A_REG, &csreg);
-+
-+ if (csreg & (BCM2708_I2S_TXON | BCM2708_I2S_RXON))
-+ return 0;
-+
-+
-+ bcm2708_i2s_setup_gpio();
-+
-+ /*
-+ * Adjust the data length according to the format.
-+ * We prefill the half frame length with an integer
-+ * divider of 2400 as explained at the clock settings.
-+ * Maybe it is overwritten there, if the Integer mode
-+ * does not apply.
-+ */
-+ switch (params_format(params)) {
-+ case SNDRV_PCM_FORMAT_S16_LE:
-+ data_length = 16;
-+ bclk_ratio = 50;
-+ break;
-+ case SNDRV_PCM_FORMAT_S24_LE:
-+ data_length = 24;
-+ bclk_ratio = 50;
-+ break;
-+ case SNDRV_PCM_FORMAT_S32_LE:
-+ data_length = 32;
-+ bclk_ratio = 100;
-+ break;
-+ default:
-+ return -EINVAL;
-+ }
-+
-+ /* If bclk_ratio already set, use that one. */
-+ if (dev->bclk_ratio)
-+ bclk_ratio = dev->bclk_ratio;
-+
-+ /*
-+ * Clock Settings
-+ *
-+ * The target frequency of the bit clock is
-+ * sampling rate * frame length
-+ *
-+ * Integer mode:
-+ * Sampling rates that are multiples of 8000 kHz
-+ * can be driven by the oscillator of 19.2 MHz
-+ * with an integer divider as long as the frame length
-+ * is an integer divider of 19200000/8000=2400 as set up above.
-+ * This is no longer possible if the sampling rate
-+ * is too high (e.g. 192 kHz), because the oscillator is too slow.
-+ *
-+ * MASH mode:
-+ * For all other sampling rates, it is not possible to
-+ * have an integer divider. Approximate the clock
-+ * with the MASH module that induces a slight frequency
-+ * variance. To minimize that it is best to have the fastest
-+ * clock here. That is PLLD with 500 MHz.
-+ */
-+ target_frequency = sampling_rate * bclk_ratio;
-+ clk_src = BCM2708_CLK_SRC_OSC;
-+ mash = BCM2708_CLK_MASH_0;
-+
-+ if (bcm2708_clk_freq[clk_src] % target_frequency == 0
-+ && bit_master && frame_master) {
-+ divi = bcm2708_clk_freq[clk_src] / target_frequency;
-+ divf = 0;
-+ } else {
-+ uint64_t dividend;
-+
-+ if (!dev->bclk_ratio) {
-+ /*
-+ * Overwrite bclk_ratio, because the
-+ * above trick is not needed or can
-+ * not be used.
-+ */
-+ bclk_ratio = 2 * data_length;
-+ }
-+
-+ target_frequency = sampling_rate * bclk_ratio;
-+
-+ clk_src = BCM2708_CLK_SRC_PLLD;
-+ mash = BCM2708_CLK_MASH_1;
-+
-+ dividend = bcm2708_clk_freq[clk_src];
-+ dividend <<= BCM2708_CLK_SHIFT;
-+ do_div(dividend, target_frequency);
-+ divi = dividend >> BCM2708_CLK_SHIFT;
-+ divf = dividend & BCM2708_CLK_DIVF_MASK;
-+ }
-+
-+ /* Set clock divider */
-+ regmap_write(dev->clk_regmap, BCM2708_CLK_PCMDIV_REG, BCM2708_CLK_PASSWD
-+ | BCM2708_CLK_DIVI(divi)
-+ | BCM2708_CLK_DIVF(divf));
-+
-+ /* Setup clock, but don't start it yet */
-+ regmap_write(dev->clk_regmap, BCM2708_CLK_PCMCTL_REG, BCM2708_CLK_PASSWD
-+ | BCM2708_CLK_MASH(mash)
-+ | BCM2708_CLK_SRC(clk_src));
-+
-+ /* Setup the frame format */
-+ format = BCM2708_I2S_CHEN;
-+
-+ if (data_length >= 24)
-+ format |= BCM2708_I2S_CHWEX;
-+
-+ format |= BCM2708_I2S_CHWID((data_length-8)&0xf);
-+
-+ switch (dev->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
-+ case SND_SOC_DAIFMT_I2S:
-+ data_delay = 1;
-+ break;
-+ default:
-+ /*
-+ * TODO
-+ * Others are possible but are not implemented at the moment.
-+ */
-+ dev_err(dev->dev, "%s:bad format\n", __func__);
-+ return -EINVAL;
-+ }
-+
-+ ch1pos = data_delay;
-+ ch2pos = bclk_ratio / 2 + data_delay;
-+
-+ switch (params_channels(params)) {
-+ case 2:
-+ format = BCM2708_I2S_CH1(format) | BCM2708_I2S_CH2(format);
-+ format |= BCM2708_I2S_CH1(BCM2708_I2S_CHPOS(ch1pos));
-+ format |= BCM2708_I2S_CH2(BCM2708_I2S_CHPOS(ch2pos));
-+ break;
-+ default:
-+ return -EINVAL;
-+ }
-+
-+ /*
-+ * Set format for both streams.
-+ * We cannot set another frame length
-+ * (and therefore word length) anyway,
-+ * so the format will be the same.
-+ */
-+ regmap_write(dev->i2s_regmap, BCM2708_I2S_RXC_A_REG, format);
-+ regmap_write(dev->i2s_regmap, BCM2708_I2S_TXC_A_REG, format);
-+
-+ /* Setup the I2S mode */
-+ mode = 0;
-+
-+ if (data_length <= 16) {
-+ /*
-+ * Use frame packed mode (2 channels per 32 bit word)
-+ * We cannot set another frame length in the second stream
-+ * (and therefore word length) anyway,
-+ * so the format will be the same.
-+ */
-+ mode |= BCM2708_I2S_FTXP | BCM2708_I2S_FRXP;
-+ }
-+
-+ mode |= BCM2708_I2S_FLEN(bclk_ratio - 1);
-+ mode |= BCM2708_I2S_FSLEN(bclk_ratio / 2);
-+
-+ /* Master or slave? */
-+ switch (dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) {
-+ case SND_SOC_DAIFMT_CBS_CFS:
-+ /* CPU is master */
-+ break;
-+ case SND_SOC_DAIFMT_CBM_CFS:
-+ /*
-+ * CODEC is bit clock master
-+ * CPU is frame master
-+ */
-+ mode |= BCM2708_I2S_CLKM;
-+ break;
-+ case SND_SOC_DAIFMT_CBS_CFM:
-+ /*
-+ * CODEC is frame master
-+ * CPU is bit clock master
-+ */
-+ mode |= BCM2708_I2S_FSM;
-+ break;
-+ case SND_SOC_DAIFMT_CBM_CFM:
-+ /* CODEC is master */
-+ mode |= BCM2708_I2S_CLKM;
-+ mode |= BCM2708_I2S_FSM;
-+ break;
-+ default:
-+ dev_err(dev->dev, "%s:bad master\n", __func__);
-+ return -EINVAL;
-+ }
-+
-+ /*
-+ * Invert clocks?
-+ *
-+ * The BCM approach seems to be inverted to the classical I2S approach.
-+ */
-+ switch (dev->fmt & SND_SOC_DAIFMT_INV_MASK) {
-+ case SND_SOC_DAIFMT_NB_NF:
-+ /* None. Therefore, both for BCM */
-+ mode |= BCM2708_I2S_CLKI;
-+ mode |= BCM2708_I2S_FSI;
-+ break;
-+ case SND_SOC_DAIFMT_IB_IF:
-+ /* Both. Therefore, none for BCM */
-+ break;
-+ case SND_SOC_DAIFMT_NB_IF:
-+ /*
-+ * Invert only frame sync. Therefore,
-+ * invert only bit clock for BCM
-+ */
-+ mode |= BCM2708_I2S_CLKI;
-+ break;
-+ case SND_SOC_DAIFMT_IB_NF:
-+ /*
-+ * Invert only bit clock. Therefore,
-+ * invert only frame sync for BCM
-+ */
-+ mode |= BCM2708_I2S_FSI;
-+ break;
-+ default:
-+ return -EINVAL;
-+ }
-+
-+ regmap_write(dev->i2s_regmap, BCM2708_I2S_MODE_A_REG, mode);
-+
-+ /* Setup the DMA parameters */
-+ regmap_update_bits(dev->i2s_regmap, BCM2708_I2S_CS_A_REG,
-+ BCM2708_I2S_RXTHR(1)
-+ | BCM2708_I2S_TXTHR(1)
-+ | BCM2708_I2S_DMAEN, 0xffffffff);
-+
-+ regmap_update_bits(dev->i2s_regmap, BCM2708_I2S_DREQ_A_REG,
-+ BCM2708_I2S_TX_PANIC(0x10)
-+ | BCM2708_I2S_RX_PANIC(0x30)
-+ | BCM2708_I2S_TX(0x30)
-+ | BCM2708_I2S_RX(0x20), 0xffffffff);
-+
-+ /* Clear FIFOs */
-+ bcm2708_i2s_clear_fifos(dev, true, true);
-+
-+ return 0;
-+}
-+
-+static int bcm2708_i2s_prepare(struct snd_pcm_substream *substream,
-+ struct snd_soc_dai *dai)
-+{
-+ struct bcm2708_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
-+ uint32_t cs_reg;
-+
-+ bcm2708_i2s_start_clock(dev);
-+
-+ /*
-+ * Clear both FIFOs if the one that should be started
-+ * is not empty at the moment. This should only happen
-+ * after overrun. Otherwise, hw_params would have cleared
-+ * the FIFO.
-+ */
-+ regmap_read(dev->i2s_regmap, BCM2708_I2S_CS_A_REG, &cs_reg);
-+
-+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK
-+ && !(cs_reg & BCM2708_I2S_TXE))
-+ bcm2708_i2s_clear_fifos(dev, true, false);
-+ else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE
-+ && (cs_reg & BCM2708_I2S_RXD))
-+ bcm2708_i2s_clear_fifos(dev, false, true);
-+
-+ return 0;
-+}
-+
-+static void bcm2708_i2s_stop(struct bcm2708_i2s_dev *dev,
-+ struct snd_pcm_substream *substream,
-+ struct snd_soc_dai *dai)
-+{
-+ uint32_t mask;
-+
-+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
-+ mask = BCM2708_I2S_RXON;
-+ else
-+ mask = BCM2708_I2S_TXON;
-+
-+ regmap_update_bits(dev->i2s_regmap,
-+ BCM2708_I2S_CS_A_REG, mask, 0);
-+
-+ /* Stop also the clock when not SND_SOC_DAIFMT_CONT */
-+ if (!dai->active && !(dev->fmt & SND_SOC_DAIFMT_CONT))
-+ bcm2708_i2s_stop_clock(dev);
-+}
-+
-+static int bcm2708_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
-+ struct snd_soc_dai *dai)
-+{
-+ struct bcm2708_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
-+ uint32_t mask;
-+
-+ switch (cmd) {
-+ case SNDRV_PCM_TRIGGER_START:
-+ case SNDRV_PCM_TRIGGER_RESUME:
-+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
-+ bcm2708_i2s_start_clock(dev);
-+
-+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
-+ mask = BCM2708_I2S_RXON;
-+ else
-+ mask = BCM2708_I2S_TXON;
-+
-+ regmap_update_bits(dev->i2s_regmap,
-+ BCM2708_I2S_CS_A_REG, mask, mask);
-+ break;
-+
-+ case SNDRV_PCM_TRIGGER_STOP:
-+ case SNDRV_PCM_TRIGGER_SUSPEND:
-+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
-+ bcm2708_i2s_stop(dev, substream, dai);
-+ break;
-+ default:
-+ return -EINVAL;
-+ }
-+
-+ return 0;
-+}
-+
-+static int bcm2708_i2s_startup(struct snd_pcm_substream *substream,
-+ struct snd_soc_dai *dai)
-+{
-+ struct bcm2708_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
-+
-+ if (dai->active)
-+ return 0;
-+
-+ /* Should this still be running stop it */
-+ bcm2708_i2s_stop_clock(dev);
-+
-+ /* Enable PCM block */
-+ regmap_update_bits(dev->i2s_regmap, BCM2708_I2S_CS_A_REG,
-+ BCM2708_I2S_EN, BCM2708_I2S_EN);
-+
-+ /*
-+ * Disable STBY.
-+ * Requires at least 4 PCM clock cycles to take effect.
-+ */
-+ regmap_update_bits(dev->i2s_regmap, BCM2708_I2S_CS_A_REG,
-+ BCM2708_I2S_STBY, BCM2708_I2S_STBY);
-+
-+ return 0;
-+}
-+
-+static void bcm2708_i2s_shutdown(struct snd_pcm_substream *substream,
-+ struct snd_soc_dai *dai)
-+{
-+ struct bcm2708_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
-+
-+ bcm2708_i2s_stop(dev, substream, dai);
-+
-+ /* If both streams are stopped, disable module and clock */
-+ if (dai->active)
-+ return;
-+
-+ /* Disable the module */
-+ regmap_update_bits(dev->i2s_regmap, BCM2708_I2S_CS_A_REG,
-+ BCM2708_I2S_EN, 0);
-+
-+ /*
-+ * Stopping clock is necessary, because stop does
-+ * not stop the clock when SND_SOC_DAIFMT_CONT
-+ */
-+ bcm2708_i2s_stop_clock(dev);
-+}
-+
-+static const struct snd_soc_dai_ops bcm2708_i2s_dai_ops = {
-+ .startup = bcm2708_i2s_startup,
-+ .shutdown = bcm2708_i2s_shutdown,
-+ .prepare = bcm2708_i2s_prepare,
-+ .trigger = bcm2708_i2s_trigger,
-+ .hw_params = bcm2708_i2s_hw_params,
-+ .set_fmt = bcm2708_i2s_set_dai_fmt,
-+ .set_bclk_ratio = bcm2708_i2s_set_dai_bclk_ratio
-+};
-+
-+static int bcm2708_i2s_dai_probe(struct snd_soc_dai *dai)
-+{
-+ struct bcm2708_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
-+
-+ dai->playback_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
-+ dai->capture_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
-+
-+ return 0;
-+}
-+
-+static struct snd_soc_dai_driver bcm2708_i2s_dai = {
-+ .name = "bcm2708-i2s",
-+ .probe = bcm2708_i2s_dai_probe,
-+ .playback = {
-+ .channels_min = 2,
-+ .channels_max = 2,
-+ .rates = SNDRV_PCM_RATE_8000_192000,
-+ .formats = SNDRV_PCM_FMTBIT_S16_LE
-+ | SNDRV_PCM_FMTBIT_S24_LE
-+ | SNDRV_PCM_FMTBIT_S32_LE
-+ },
-+ .capture = {
-+ .channels_min = 2,
-+ .channels_max = 2,
-+ .rates = SNDRV_PCM_RATE_8000_192000,
-+ .formats = SNDRV_PCM_FMTBIT_S16_LE
-+ | SNDRV_PCM_FMTBIT_S24_LE
-+ | SNDRV_PCM_FMTBIT_S32_LE
-+ },
-+ .ops = &bcm2708_i2s_dai_ops,
-+ .symmetric_rates = 1
-+};
-+
-+static bool bcm2708_i2s_volatile_reg(struct device *dev, unsigned int reg)
-+{
-+ switch (reg) {
-+ case BCM2708_I2S_CS_A_REG:
-+ case BCM2708_I2S_FIFO_A_REG:
-+ case BCM2708_I2S_INTSTC_A_REG:
-+ case BCM2708_I2S_GRAY_REG:
-+ return true;
-+ default:
-+ return false;
-+ };
-+}
-+
-+static bool bcm2708_i2s_precious_reg(struct device *dev, unsigned int reg)
-+{
-+ switch (reg) {
-+ case BCM2708_I2S_FIFO_A_REG:
-+ return true;
-+ default:
-+ return false;
-+ };
-+}
-+
-+static bool bcm2708_clk_volatile_reg(struct device *dev, unsigned int reg)
-+{
-+ switch (reg) {
-+ case BCM2708_CLK_PCMCTL_REG:
-+ return true;
-+ default:
-+ return false;
-+ };
-+}
-+
-+static const struct regmap_config bcm2708_regmap_config[] = {
-+ {
-+ .reg_bits = 32,
-+ .reg_stride = 4,
-+ .val_bits = 32,
-+ .max_register = BCM2708_I2S_GRAY_REG,
-+ .precious_reg = bcm2708_i2s_precious_reg,
-+ .volatile_reg = bcm2708_i2s_volatile_reg,
-+ .cache_type = REGCACHE_RBTREE,
-+ .name = "i2s",
-+ },
-+ {
-+ .reg_bits = 32,
-+ .reg_stride = 4,
-+ .val_bits = 32,
-+ .max_register = BCM2708_CLK_PCMDIV_REG,
-+ .volatile_reg = bcm2708_clk_volatile_reg,
-+ .cache_type = REGCACHE_RBTREE,
-+ .name = "clk",
-+ },
-+};
-+
-+static const struct snd_soc_component_driver bcm2708_i2s_component = {
-+ .name = "bcm2708-i2s-comp",
-+};
-+
-+static const struct snd_pcm_hardware bcm2708_pcm_hardware = {
-+ .info = SNDRV_PCM_INFO_INTERLEAVED |
-+ SNDRV_PCM_INFO_JOINT_DUPLEX,
-+ .formats = SNDRV_PCM_FMTBIT_S16_LE |
-+ SNDRV_PCM_FMTBIT_S24_LE |
-+ SNDRV_PCM_FMTBIT_S32_LE,
-+ .period_bytes_min = 32,
-+ .period_bytes_max = 64 * PAGE_SIZE,
-+ .periods_min = 2,
-+ .periods_max = 255,
-+ .buffer_bytes_max = 128 * PAGE_SIZE,
-+};
-+
-+static const struct snd_dmaengine_pcm_config bcm2708_dmaengine_pcm_config = {
-+ .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
-+ .pcm_hardware = &bcm2708_pcm_hardware,
-+ .prealloc_buffer_size = 256 * PAGE_SIZE,
-+};
-+
-+
-+static int bcm2708_i2s_probe(struct platform_device *pdev)
-+{
-+ struct bcm2708_i2s_dev *dev;
-+ int i;
-+ int ret;
-+ struct regmap *regmap[2];
-+ struct resource *mem[2];
-+
-+ /* Request both ioareas */
-+ for (i = 0; i <= 1; i++) {
-+ void __iomem *base;
-+
-+ mem[i] = platform_get_resource(pdev, IORESOURCE_MEM, i);
-+ base = devm_ioremap_resource(&pdev->dev, mem[i]);
-+ if (IS_ERR(base))
-+ return PTR_ERR(base);
-+
-+ regmap[i] = devm_regmap_init_mmio(&pdev->dev, base,
-+ &bcm2708_regmap_config[i]);
-+ if (IS_ERR(regmap[i])) {
-+ dev_err(&pdev->dev, "I2S probe: regmap init failed\n");
-+ return PTR_ERR(regmap[i]);
-+ }
-+ }
-+
-+ dev = devm_kzalloc(&pdev->dev, sizeof(*dev),
-+ GFP_KERNEL);
-+ if (IS_ERR(dev))
-+ return PTR_ERR(dev);
-+
-+ dev->i2s_regmap = regmap[0];
-+ dev->clk_regmap = regmap[1];
-+
-+ /* Set the DMA address */
-+ dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
-+ (dma_addr_t)BCM2708_I2S_FIFO_PHYSICAL_ADDR;
-+
-+ dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
-+ (dma_addr_t)BCM2708_I2S_FIFO_PHYSICAL_ADDR;
-+
-+ /* Set the DREQ */
-+ dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].slave_id =
-+ BCM2708_DMA_DREQ_PCM_TX;
-+ dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].slave_id =
-+ BCM2708_DMA_DREQ_PCM_RX;
-+
-+ /* Set the bus width */
-+ dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr_width =
-+ DMA_SLAVE_BUSWIDTH_4_BYTES;
-+ dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr_width =
-+ DMA_SLAVE_BUSWIDTH_4_BYTES;
-+
-+ /* Set burst */
-+ dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].maxburst = 2;
-+ dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].maxburst = 2;
-+
-+ /* BCLK ratio - use default */
-+ dev->bclk_ratio = 0;
-+
-+ /* Store the pdev */
-+ dev->dev = &pdev->dev;
-+ dev_set_drvdata(&pdev->dev, dev);
-+
-+ ret = snd_soc_register_component(&pdev->dev,
-+ &bcm2708_i2s_component, &bcm2708_i2s_dai, 1);
-+
-+ if (ret) {
-+ dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
-+ ret = -ENOMEM;
-+ return ret;
-+ }
-+
-+ ret = snd_dmaengine_pcm_register(&pdev->dev,
-+ &bcm2708_dmaengine_pcm_config,
-+ SND_DMAENGINE_PCM_FLAG_COMPAT);
-+ if (ret) {
-+ dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
-+ snd_soc_unregister_component(&pdev->dev);
-+ return ret;
-+ }
-+
-+ return 0;
-+}
-+
-+static int bcm2708_i2s_remove(struct platform_device *pdev)
-+{
-+ snd_dmaengine_pcm_unregister(&pdev->dev);
-+ snd_soc_unregister_component(&pdev->dev);
-+ return 0;
-+}
-+
-+static struct platform_driver bcm2708_i2s_driver = {
-+ .probe = bcm2708_i2s_probe,
-+ .remove = bcm2708_i2s_remove,
-+ .driver = {
-+ .name = "bcm2708-i2s",
-+ .owner = THIS_MODULE,
-+ },
-+};
-+
-+module_platform_driver(bcm2708_i2s_driver);
-+
-+MODULE_ALIAS("platform:bcm2708-i2s");
-+MODULE_DESCRIPTION("BCM2708 I2S interface");
-+MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
-+MODULE_LICENSE("GPL v2");
---- /dev/null
-+++ b/sound/soc/bcm/bcm2708-i2s.h
-@@ -0,0 +1,35 @@
-+/*
-+ * I2S configuration for sound cards.
-+ *
-+ * Copyright (c) 2014 Daniel Matuschek <daniel@hifiberry.com>
-+ *
-+ * 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.
-+ *
-+ * 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.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program; if not, write to the Free Software
-+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-+ */
-+
-+#ifndef BCM2708_I2S_H
-+#define BCM2708_I2S_H
-+
-+/* I2S pin assignment */
-+#define BCM2708_I2S_GPIO_AUTO 0
-+#define BCM2708_I2S_GPIO_PIN18 1
-+#define BCM2708_I2S_GPIO_PIN28 2
-+
-+/* Alt mode to enable I2S */
-+#define BCM2708_I2S_GPIO_PIN18_ALT 0
-+#define BCM2708_I2S_GPIO_PIN28_ALT 2
-+
-+extern void bcm2708_i2s_set_gpio(int gpio);
-+
-+#endif
projects / openwrt / openwrt.git / blobdiff