392 lines
11 KiB
C
392 lines
11 KiB
C
/**
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* Freescale P1022RDK ALSA SoC Machine driver
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*
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* Author: Timur Tabi <timur@freescale.com>
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*
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* Copyright 2012 Freescale Semiconductor, Inc.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*
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* Note: in order for audio to work correctly, the output controls need
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* to be enabled, because they control the clock. So for playback, for
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* example:
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*
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* amixer sset 'Left Output Mixer PCM' on
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* amixer sset 'Right Output Mixer PCM' on
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*/
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#include <linux/module.h>
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#include <linux/fsl/guts.h>
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#include <linux/interrupt.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/slab.h>
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#include <sound/soc.h>
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#include "fsl_dma.h"
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#include "fsl_ssi.h"
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#include "fsl_utils.h"
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/* P1022-specific PMUXCR and DMUXCR bit definitions */
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#define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK 0x0001c000
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#define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI 0x00010000
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#define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI 0x00018000
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#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK 0x00000c00
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#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI 0x00000000
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#define CCSR_GUTS_DMUXCR_PAD 1 /* DMA controller/channel set to pad */
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#define CCSR_GUTS_DMUXCR_SSI 2 /* DMA controller/channel set to SSI */
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/*
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* Set the DMACR register in the GUTS
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*
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* The DMACR register determines the source of initiated transfers for each
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* channel on each DMA controller. Rather than have a bunch of repetitive
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* macros for the bit patterns, we just have a function that calculates
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* them.
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*
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* guts: Pointer to GUTS structure
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* co: The DMA controller (0 or 1)
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* ch: The channel on the DMA controller (0, 1, 2, or 3)
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* device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
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*/
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static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
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unsigned int co, unsigned int ch, unsigned int device)
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{
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unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
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clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
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}
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/* There's only one global utilities register */
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static phys_addr_t guts_phys;
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/**
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* machine_data: machine-specific ASoC device data
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*
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* This structure contains data for a single sound platform device on an
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* P1022 RDK. Some of the data is taken from the device tree.
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*/
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struct machine_data {
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struct snd_soc_dai_link dai[2];
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struct snd_soc_card card;
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unsigned int dai_format;
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unsigned int codec_clk_direction;
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unsigned int cpu_clk_direction;
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unsigned int clk_frequency;
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unsigned int dma_id[2]; /* 0 = DMA1, 1 = DMA2, etc */
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unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
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char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
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};
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/**
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* p1022_rdk_machine_probe: initialize the board
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*
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* This function is used to initialize the board-specific hardware.
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*
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* Here we program the DMACR and PMUXCR registers.
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*/
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static int p1022_rdk_machine_probe(struct snd_soc_card *card)
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{
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struct machine_data *mdata =
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container_of(card, struct machine_data, card);
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struct ccsr_guts __iomem *guts;
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guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
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if (!guts) {
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dev_err(card->dev, "could not map global utilities\n");
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return -ENOMEM;
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}
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/* Enable SSI Tx signal */
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clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
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CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
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/* Enable SSI Rx signal */
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clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
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CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
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/* Enable DMA Channel for SSI */
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guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
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CCSR_GUTS_DMUXCR_SSI);
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guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
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CCSR_GUTS_DMUXCR_SSI);
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iounmap(guts);
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return 0;
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}
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/**
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* p1022_rdk_startup: program the board with various hardware parameters
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*
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* This function takes board-specific information, like clock frequencies
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* and serial data formats, and passes that information to the codec and
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* transport drivers.
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*/
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static int p1022_rdk_startup(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct machine_data *mdata =
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container_of(rtd->card, struct machine_data, card);
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struct device *dev = rtd->card->dev;
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int ret = 0;
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/* Tell the codec driver what the serial protocol is. */
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ret = snd_soc_dai_set_fmt(rtd->codec_dai, mdata->dai_format);
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if (ret < 0) {
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dev_err(dev, "could not set codec driver audio format (ret=%i)\n",
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ret);
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return ret;
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}
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ret = snd_soc_dai_set_pll(rtd->codec_dai, 0, 0, mdata->clk_frequency,
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mdata->clk_frequency);
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if (ret < 0) {
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dev_err(dev, "could not set codec PLL frequency (ret=%i)\n",
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ret);
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return ret;
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}
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return 0;
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}
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/**
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* p1022_rdk_machine_remove: Remove the sound device
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*
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* This function is called to remove the sound device for one SSI. We
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* de-program the DMACR and PMUXCR register.
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*/
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static int p1022_rdk_machine_remove(struct snd_soc_card *card)
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{
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struct machine_data *mdata =
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container_of(card, struct machine_data, card);
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struct ccsr_guts __iomem *guts;
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guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
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if (!guts) {
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dev_err(card->dev, "could not map global utilities\n");
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return -ENOMEM;
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}
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/* Restore the signal routing */
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clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
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clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
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guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
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guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
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iounmap(guts);
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return 0;
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}
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/**
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* p1022_rdk_ops: ASoC machine driver operations
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*/
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static struct snd_soc_ops p1022_rdk_ops = {
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.startup = p1022_rdk_startup,
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};
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/**
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* p1022_rdk_probe: platform probe function for the machine driver
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*
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* Although this is a machine driver, the SSI node is the "master" node with
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* respect to audio hardware connections. Therefore, we create a new ASoC
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* device for each new SSI node that has a codec attached.
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*/
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static int p1022_rdk_probe(struct platform_device *pdev)
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{
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struct device *dev = pdev->dev.parent;
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/* ssi_pdev is the platform device for the SSI node that probed us */
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struct platform_device *ssi_pdev = to_platform_device(dev);
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struct device_node *np = ssi_pdev->dev.of_node;
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struct device_node *codec_np = NULL;
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struct machine_data *mdata;
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const u32 *iprop;
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int ret;
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/* Find the codec node for this SSI. */
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codec_np = of_parse_phandle(np, "codec-handle", 0);
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if (!codec_np) {
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dev_err(dev, "could not find codec node\n");
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return -EINVAL;
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}
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mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
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if (!mdata) {
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ret = -ENOMEM;
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goto error_put;
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}
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mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
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mdata->dai[0].ops = &p1022_rdk_ops;
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/* ASoC core can match codec with device node */
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mdata->dai[0].codec_of_node = codec_np;
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/*
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* We register two DAIs per SSI, one for playback and the other for
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* capture. We support codecs that have separate DAIs for both playback
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* and capture.
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*/
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memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
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/* The DAI names from the codec (snd_soc_dai_driver.name) */
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mdata->dai[0].codec_dai_name = "wm8960-hifi";
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mdata->dai[1].codec_dai_name = mdata->dai[0].codec_dai_name;
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/*
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* Configure the SSI for I2S slave mode. Older device trees have
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* an fsl,mode property, but we ignore that since there's really
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* only one way to configure the SSI.
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*/
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mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
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SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
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mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
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mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
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/*
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* In i2s-slave mode, the codec has its own clock source, so we
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* need to get the frequency from the device tree and pass it to
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* the codec driver.
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*/
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iprop = of_get_property(codec_np, "clock-frequency", NULL);
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if (!iprop || !*iprop) {
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dev_err(&pdev->dev, "codec bus-frequency property is missing or invalid\n");
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ret = -EINVAL;
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goto error;
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}
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mdata->clk_frequency = be32_to_cpup(iprop);
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if (!mdata->clk_frequency) {
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dev_err(&pdev->dev, "unknown clock frequency\n");
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ret = -EINVAL;
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goto error;
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}
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/* Find the playback DMA channel to use. */
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mdata->dai[0].platform_name = mdata->platform_name[0];
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ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
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&mdata->dma_channel_id[0],
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&mdata->dma_id[0]);
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if (ret) {
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dev_err(&pdev->dev, "missing/invalid playback DMA phandle (ret=%i)\n",
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ret);
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goto error;
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}
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/* Find the capture DMA channel to use. */
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mdata->dai[1].platform_name = mdata->platform_name[1];
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ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
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&mdata->dma_channel_id[1],
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&mdata->dma_id[1]);
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if (ret) {
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dev_err(&pdev->dev, "missing/invalid capture DMA phandle (ret=%i)\n",
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ret);
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goto error;
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}
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/* Initialize our DAI data structure. */
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mdata->dai[0].stream_name = "playback";
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mdata->dai[1].stream_name = "capture";
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mdata->dai[0].name = mdata->dai[0].stream_name;
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mdata->dai[1].name = mdata->dai[1].stream_name;
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mdata->card.probe = p1022_rdk_machine_probe;
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mdata->card.remove = p1022_rdk_machine_remove;
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mdata->card.name = pdev->name; /* The platform driver name */
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mdata->card.owner = THIS_MODULE;
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mdata->card.dev = &pdev->dev;
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mdata->card.num_links = 2;
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mdata->card.dai_link = mdata->dai;
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/* Register with ASoC */
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ret = snd_soc_register_card(&mdata->card);
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if (ret) {
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dev_err(&pdev->dev, "could not register card (ret=%i)\n", ret);
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goto error;
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}
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return 0;
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error:
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kfree(mdata);
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error_put:
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of_node_put(codec_np);
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return ret;
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}
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/**
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* p1022_rdk_remove: remove the platform device
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*
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* This function is called when the platform device is removed.
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*/
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static int p1022_rdk_remove(struct platform_device *pdev)
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{
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struct snd_soc_card *card = platform_get_drvdata(pdev);
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struct machine_data *mdata =
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container_of(card, struct machine_data, card);
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snd_soc_unregister_card(card);
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kfree(mdata);
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return 0;
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}
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static struct platform_driver p1022_rdk_driver = {
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.probe = p1022_rdk_probe,
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.remove = p1022_rdk_remove,
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.driver = {
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/*
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* The name must match 'compatible' property in the device tree,
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* in lowercase letters.
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*/
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.name = "snd-soc-p1022rdk",
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},
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};
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/**
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* p1022_rdk_init: machine driver initialization.
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*
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* This function is called when this module is loaded.
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*/
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static int __init p1022_rdk_init(void)
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{
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struct device_node *guts_np;
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struct resource res;
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/* Get the physical address of the global utilities registers */
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guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
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if (of_address_to_resource(guts_np, 0, &res)) {
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pr_err("snd-soc-p1022rdk: missing/invalid global utils node\n");
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of_node_put(guts_np);
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return -EINVAL;
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}
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guts_phys = res.start;
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of_node_put(guts_np);
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return platform_driver_register(&p1022_rdk_driver);
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}
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/**
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* p1022_rdk_exit: machine driver exit
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*
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* This function is called when this driver is unloaded.
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*/
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static void __exit p1022_rdk_exit(void)
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{
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platform_driver_unregister(&p1022_rdk_driver);
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}
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late_initcall(p1022_rdk_init);
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module_exit(p1022_rdk_exit);
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MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
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MODULE_DESCRIPTION("Freescale / iVeia P1022 RDK ALSA SoC machine driver");
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MODULE_LICENSE("GPL v2");
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