1 files changed, 414 insertions, 0 deletions
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
new file mode 100644
index 0000000..40d87e6
--- /dev/null
+++ b/sound/soc/omap/omap-mcbsp.c
@@ -0,0 +1,414 @@
+/*
+ * omap-mcbsp.c  --  OMAP ALSA SoC DAI driver using McBSP port
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * Contact: Jarkko Nikula <jarkko.nikula@nokia.com>
+ *
+ * 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.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include <asm/arch/control.h>
+#include <asm/arch/dma.h>
+#include <asm/arch/mcbsp.h>
+#include "omap-mcbsp.h"
+#include "omap-pcm.h"
+
+#define OMAP_MCBSP_RATES	(SNDRV_PCM_RATE_44100 | \
+				 SNDRV_PCM_RATE_48000 | \
+				 SNDRV_PCM_RATE_KNOT)
+
+struct omap_mcbsp_data {
+	unsigned int			bus_id;
+	struct omap_mcbsp_reg_cfg	regs;
+	/*
+	 * Flags indicating is the bus already activated and configured by
+	 * another substream
+	 */
+	int				active;
+	int				configured;
+};
+
+#define to_mcbsp(priv)	container_of((priv), struct omap_mcbsp_data, bus_id)
+
+static struct omap_mcbsp_data mcbsp_data[NUM_LINKS];
+
+/*
+ * Stream DMA parameters. DMA request line and port address are set runtime
+ * since they are different between OMAP1 and later OMAPs
+ */
+static struct omap_pcm_dma_data omap_mcbsp_dai_dma_params[NUM_LINKS][2] = {
+{
+	{ .name		= "I2S PCM Stereo out", },
+	{ .name		= "I2S PCM Stereo in", },
+},
+};
+
+#if defined(CONFIG_ARCH_OMAP15XX) || defined(CONFIG_ARCH_OMAP16XX)
+static const int omap1_dma_reqs[][2] = {
+	{ OMAP_DMA_MCBSP1_TX, OMAP_DMA_MCBSP1_RX },
+	{ OMAP_DMA_MCBSP2_TX, OMAP_DMA_MCBSP2_RX },
+	{ OMAP_DMA_MCBSP3_TX, OMAP_DMA_MCBSP3_RX },
+};
+static const unsigned long omap1_mcbsp_port[][2] = {
+	{ OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
+	  OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
+	{ OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
+	  OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
+	{ OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DXR1,
+	  OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DRR1 },
+};
+#else
+static const int omap1_dma_reqs[][2] = {};
+static const unsigned long omap1_mcbsp_port[][2] = {};
+#endif
+#if defined(CONFIG_ARCH_OMAP2420)
+static const int omap2420_dma_reqs[][2] = {
+	{ OMAP24XX_DMA_MCBSP1_TX, OMAP24XX_DMA_MCBSP1_RX },
+	{ OMAP24XX_DMA_MCBSP2_TX, OMAP24XX_DMA_MCBSP2_RX },
+};
+static const unsigned long omap2420_mcbsp_port[][2] = {
+	{ OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
+	  OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
+	{ OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
+	  OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
+};
+#else
+static const int omap2420_dma_reqs[][2] = {};
+static const unsigned long omap2420_mcbsp_port[][2] = {};
+#endif
+
+static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
+	int err = 0;
+
+	if (!cpu_dai->active)
+		err = omap_mcbsp_request(mcbsp_data->bus_id);
+
+	return err;
+}
+
+static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
+
+	if (!cpu_dai->active) {
+		omap_mcbsp_free(mcbsp_data->bus_id);
+		mcbsp_data->configured = 0;
+	}
+}
+
+static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
+	int err = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		if (!mcbsp_data->active++)
+			omap_mcbsp_start(mcbsp_data->bus_id);
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		if (!--mcbsp_data->active)
+			omap_mcbsp_stop(mcbsp_data->bus_id);
+		break;
+	default:
+		err = -EINVAL;
+	}
+
+	return err;
+}
+
+static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
+				    struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
+	struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
+	int dma, bus_id = mcbsp_data->bus_id, id = cpu_dai->id;
+	unsigned long port;
+
+	if (cpu_class_is_omap1()) {
+		dma = omap1_dma_reqs[bus_id][substream->stream];
+		port = omap1_mcbsp_port[bus_id][substream->stream];
+	} else if (cpu_is_omap2420()) {
+		dma = omap2420_dma_reqs[bus_id][substream->stream];
+		port = omap2420_mcbsp_port[bus_id][substream->stream];
+	} else {
+		/*
+		 * TODO: Add support for 2430 and 3430
+		 */
+		return -ENODEV;
+	}
+	omap_mcbsp_dai_dma_params[id][substream->stream].dma_req = dma;
+	omap_mcbsp_dai_dma_params[id][substream->stream].port_addr = port;
+	cpu_dai->dma_data = &omap_mcbsp_dai_dma_params[id][substream->stream];
+
+	if (mcbsp_data->configured) {
+		/* McBSP already configured by another stream */
+		return 0;
+	}
+
+	switch (params_channels(params)) {
+	case 2:
+		/* Set 1 word per (McBPSP) frame and use dual-phase frames */
+		regs->rcr2	|= RFRLEN2(1 - 1) | RPHASE;
+		regs->rcr1	|= RFRLEN1(1 - 1);
+		regs->xcr2	|= XFRLEN2(1 - 1) | XPHASE;
+		regs->xcr1	|= XFRLEN1(1 - 1);
+		break;
+	default:
+		/* Unsupported number of channels */
+		return -EINVAL;
+	}
+
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		/* Set word lengths */
+		regs->rcr2	|= RWDLEN2(OMAP_MCBSP_WORD_16);
+		regs->rcr1	|= RWDLEN1(OMAP_MCBSP_WORD_16);
+		regs->xcr2	|= XWDLEN2(OMAP_MCBSP_WORD_16);
+		regs->xcr1	|= XWDLEN1(OMAP_MCBSP_WORD_16);
+		/* Set FS period and length in terms of bit clock periods */
+		regs->srgr2	|= FPER(16 * 2 - 1);
+		regs->srgr1	|= FWID(16 - 1);
+		break;
+	default:
+		/* Unsupported PCM format */
+		return -EINVAL;
+	}
+
+	omap_mcbsp_config(bus_id, &mcbsp_data->regs);
+	mcbsp_data->configured = 1;
+
+	return 0;
+}
+
+/*
+ * This must be called before _set_clkdiv and _set_sysclk since McBSP register
+ * cache is initialized here
+ */
+static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_cpu_dai *cpu_dai,
+				      unsigned int fmt)
+{
+	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
+	struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
+
+	if (mcbsp_data->configured)
+		return 0;
+
+	memset(regs, 0, sizeof(*regs));
+	/* Generic McBSP register settings */
+	regs->spcr2	|= XINTM(3) | FREE;
+	regs->spcr1	|= RINTM(3);
+	regs->rcr2	|= RFIG;
+	regs->xcr2	|= XFIG;
+
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+		/* 1-bit data delay */
+		regs->rcr2	|= RDATDLY(1);
+		regs->xcr2	|= XDATDLY(1);
+		break;
+	default:
+		/* Unsupported data format */
+		return -EINVAL;
+	}
+
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBS_CFS:
+		/* McBSP master. Set FS and bit clocks as outputs */
+		regs->pcr0	|= FSXM | FSRM |
+				   CLKXM | CLKRM;
+		/* Sample rate generator drives the FS */
+		regs->srgr2	|= FSGM;
+		break;
+	case SND_SOC_DAIFMT_CBM_CFM:
+		/* McBSP slave */
+		break;
+	default:
+		/* Unsupported master/slave configuration */
+		return -EINVAL;
+	}
+
+	/* Set bit clock (CLKX/CLKR) and FS polarities */
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_NB_NF:
+		/*
+		 * Normal BCLK + FS.
+		 * FS active low. TX data driven on falling edge of bit clock
+		 * and RX data sampled on rising edge of bit clock.
+		 */
+		regs->pcr0	|= FSXP | FSRP |
+				   CLKXP | CLKRP;
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		regs->pcr0	|= CLKXP | CLKRP;
+		break;
+	case SND_SOC_DAIFMT_IB_NF:
+		regs->pcr0	|= FSXP | FSRP;
+		break;
+	case SND_SOC_DAIFMT_IB_IF:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int omap_mcbsp_dai_set_clkdiv(struct snd_soc_cpu_dai *cpu_dai,
+				     int div_id, int div)
+{
+	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
+	struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
+
+	if (div_id != OMAP_MCBSP_CLKGDV)
+		return -ENODEV;
+
+	regs->srgr1	|= CLKGDV(div - 1);
+
+	return 0;
+}
+
+static int omap_mcbsp_dai_set_clks_src(struct omap_mcbsp_data *mcbsp_data,
+				       int clk_id)
+{
+	int sel_bit;
+	u16 reg;
+
+	if (cpu_class_is_omap1()) {
+		/* OMAP1's can use only external source clock */
+		if (unlikely(clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK))
+			return -EINVAL;
+		else
+			return 0;
+	}
+
+	switch (mcbsp_data->bus_id) {
+	case 0:
+		reg = OMAP2_CONTROL_DEVCONF0;
+		sel_bit = 2;
+		break;
+	case 1:
+		reg = OMAP2_CONTROL_DEVCONF0;
+		sel_bit = 6;
+		break;
+	/* TODO: Support for ports 3 - 5 in OMAP2430 and OMAP34xx */
+	default:
+		return -EINVAL;
+	}
+
+	if (cpu_class_is_omap2()) {
+		if (clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK) {
+			omap_ctrl_writel(omap_ctrl_readl(reg) &
+					 ~(1 << sel_bit), reg);
+		} else {
+			omap_ctrl_writel(omap_ctrl_readl(reg) |
+					 (1 << sel_bit), reg);
+		}
+	}
+
+	return 0;
+}
+
+static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_cpu_dai *cpu_dai,
+					 int clk_id, unsigned int freq,
+					 int dir)
+{
+	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
+	struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
+	int err = 0;
+
+	switch (clk_id) {
+	case OMAP_MCBSP_SYSCLK_CLK:
+		regs->srgr2	|= CLKSM;
+		break;
+	case OMAP_MCBSP_SYSCLK_CLKS_FCLK:
+	case OMAP_MCBSP_SYSCLK_CLKS_EXT:
+		err = omap_mcbsp_dai_set_clks_src(mcbsp_data, clk_id);
+		break;
+
+	case OMAP_MCBSP_SYSCLK_CLKX_EXT:
+		regs->srgr2	|= CLKSM;
+	case OMAP_MCBSP_SYSCLK_CLKR_EXT:
+		regs->pcr0	|= SCLKME;
+		break;
+	default:
+		err = -ENODEV;
+	}
+
+	return err;
+}
+
+struct snd_soc_cpu_dai omap_mcbsp_dai[NUM_LINKS] = {
+{
+	.name = "omap-mcbsp-dai",
+	.id = 0,
+	.type = SND_SOC_DAI_I2S,
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = OMAP_MCBSP_RATES,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+	.capture = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = OMAP_MCBSP_RATES,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+	.ops = {
+		.startup = omap_mcbsp_dai_startup,
+		.shutdown = omap_mcbsp_dai_shutdown,
+		.trigger = omap_mcbsp_dai_trigger,
+		.hw_params = omap_mcbsp_dai_hw_params,
+	},
+	.dai_ops = {
+		.set_fmt = omap_mcbsp_dai_set_dai_fmt,
+		.set_clkdiv = omap_mcbsp_dai_set_clkdiv,
+		.set_sysclk = omap_mcbsp_dai_set_dai_sysclk,
+	},
+	.private_data = &mcbsp_data[0].bus_id,
+},
+};
+EXPORT_SYMBOL_GPL(omap_mcbsp_dai);
+
+MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@nokia.com>");
+MODULE_DESCRIPTION("OMAP I2S SoC Interface");
+MODULE_LICENSE("GPL");