1 files changed, 346 insertions, 0 deletions
diff --git a/sound/soc/sh/hac.c b/sound/soc/sh/hac.c
new file mode 100644
index 000000000..c2b496398
--- /dev/null
+++ b/sound/soc/sh/hac.c
@@ -0,0 +1,346 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Hitachi Audio Controller (AC97) support for SH7760/SH7780
+//
+// Copyright (c) 2007 Manuel Lauss <mano@roarinelk.homelinux.net>
+//
+// dont forget to set IPSEL/OMSEL register bits (in your board code) to
+// enable HAC output pins!
+
+/* BIG FAT FIXME: although the SH7760 has 2 independent AC97 units, only
+ * the FIRST can be used since ASoC does not pass any information to the
+ * ac97_read/write() functions regarding WHICH unit to use.  You'll have
+ * to edit the code a bit to use the other AC97 unit.		--mlau
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/ac97_codec.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+/* regs and bits */
+#define HACCR		0x08
+#define HACCSAR		0x20
+#define HACCSDR		0x24
+#define HACPCML		0x28
+#define HACPCMR		0x2C
+#define HACTIER		0x50
+#define	HACTSR		0x54
+#define HACRIER		0x58
+#define HACRSR		0x5C
+#define HACACR		0x60
+
+#define CR_CR		(1 << 15)	/* "codec-ready" indicator */
+#define CR_CDRT		(1 << 11)	/* cold reset */
+#define CR_WMRT		(1 << 10)	/* warm reset */
+#define CR_B9		(1 << 9)	/* the mysterious "bit 9" */
+#define CR_ST		(1 << 5)	/* AC97 link start bit */
+
+#define CSAR_RD		(1 << 19)	/* AC97 data read bit */
+#define CSAR_WR		(0)
+
+#define TSR_CMDAMT	(1 << 31)
+#define TSR_CMDDMT	(1 << 30)
+
+#define RSR_STARY	(1 << 22)
+#define RSR_STDRY	(1 << 21)
+
+#define ACR_DMARX16	(1 << 30)
+#define ACR_DMATX16	(1 << 29)
+#define ACR_TX12ATOM	(1 << 26)
+#define ACR_DMARX20	((1 << 24) | (1 << 22))
+#define ACR_DMATX20	((1 << 23) | (1 << 21))
+
+#define CSDR_SHIFT	4
+#define CSDR_MASK	(0xffff << CSDR_SHIFT)
+#define CSAR_SHIFT	12
+#define CSAR_MASK	(0x7f << CSAR_SHIFT)
+
+#define AC97_WRITE_RETRY	1
+#define AC97_READ_RETRY		5
+
+/* manual-suggested AC97 codec access timeouts (us) */
+#define TMO_E1	500	/* 21 < E1 < 1000 */
+#define TMO_E2	13	/* 13 < E2 */
+#define TMO_E3	21	/* 21 < E3 */
+#define TMO_E4	500	/* 21 < E4 < 1000 */
+
+struct hac_priv {
+	unsigned long mmio;	/* HAC base address */
+} hac_cpu_data[] = {
+#if defined(CONFIG_CPU_SUBTYPE_SH7760)
+	{
+		.mmio	= 0xFE240000,
+	},
+	{
+		.mmio	= 0xFE250000,
+	},
+#elif defined(CONFIG_CPU_SUBTYPE_SH7780)
+	{
+		.mmio	= 0xFFE40000,
+	},
+#else
+#error "Unsupported SuperH SoC"
+#endif
+};
+
+#define HACREG(reg)	(*(unsigned long *)(hac->mmio + (reg)))
+
+/*
+ * AC97 read/write flow as outlined in the SH7760 manual (pages 903-906)
+ */
+static int hac_get_codec_data(struct hac_priv *hac, unsigned short r,
+			      unsigned short *v)
+{
+	unsigned int to1, to2, i;
+	unsigned short adr;
+
+	for (i = AC97_READ_RETRY; i; i--) {
+		*v = 0;
+		/* wait for HAC to receive something from the codec */
+		for (to1 = TMO_E4;
+		     to1 && !(HACREG(HACRSR) & RSR_STARY);
+		     --to1)
+			udelay(1);
+		for (to2 = TMO_E4; 
+		     to2 && !(HACREG(HACRSR) & RSR_STDRY);
+		     --to2)
+			udelay(1);
+
+		if (!to1 && !to2)
+			return 0;	/* codec comm is down */
+
+		adr = ((HACREG(HACCSAR) & CSAR_MASK) >> CSAR_SHIFT);
+		*v  = ((HACREG(HACCSDR) & CSDR_MASK) >> CSDR_SHIFT);
+
+		HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY);
+
+		if (r == adr)
+			break;
+
+		/* manual says: wait at least 21 usec before retrying */
+		udelay(21);
+	}
+	HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY);
+	return i;
+}
+
+static unsigned short hac_read_codec_aux(struct hac_priv *hac,
+					 unsigned short reg)
+{
+	unsigned short val;
+	unsigned int i, to;
+
+	for (i = AC97_READ_RETRY; i; i--) {
+		/* send_read_request */
+		local_irq_disable();
+		HACREG(HACTSR) &= ~(TSR_CMDAMT);
+		HACREG(HACCSAR) = (reg << CSAR_SHIFT) | CSAR_RD;
+		local_irq_enable();
+
+		for (to = TMO_E3;
+		     to && !(HACREG(HACTSR) & TSR_CMDAMT);
+		     --to)
+			udelay(1);
+
+		HACREG(HACTSR) &= ~TSR_CMDAMT;
+		val = 0;
+		if (hac_get_codec_data(hac, reg, &val) != 0)
+			break;
+	}
+
+	return i ? val : ~0;
+}
+
+static void hac_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
+			   unsigned short val)
+{
+	int unit_id = 0 /* ac97->private_data */;
+	struct hac_priv *hac = &hac_cpu_data[unit_id];
+	unsigned int i, to;
+	/* write_codec_aux */
+	for (i = AC97_WRITE_RETRY; i; i--) {
+		/* send_write_request */
+		local_irq_disable();
+		HACREG(HACTSR) &= ~(TSR_CMDDMT | TSR_CMDAMT);
+		HACREG(HACCSDR) = (val << CSDR_SHIFT);
+		HACREG(HACCSAR) = (reg << CSAR_SHIFT) & (~CSAR_RD);
+		local_irq_enable();
+
+		/* poll-wait for CMDAMT and CMDDMT */
+		for (to = TMO_E1;
+		     to && !(HACREG(HACTSR) & (TSR_CMDAMT|TSR_CMDDMT));
+		     --to)
+			udelay(1);
+
+		HACREG(HACTSR) &= ~(TSR_CMDAMT | TSR_CMDDMT);
+		if (to)
+			break;
+		/* timeout, try again */
+	}
+}
+
+static unsigned short hac_ac97_read(struct snd_ac97 *ac97,
+				    unsigned short reg)
+{
+	int unit_id = 0 /* ac97->private_data */;
+	struct hac_priv *hac = &hac_cpu_data[unit_id];
+	return hac_read_codec_aux(hac, reg);
+}
+
+static void hac_ac97_warmrst(struct snd_ac97 *ac97)
+{
+	int unit_id = 0 /* ac97->private_data */;
+	struct hac_priv *hac = &hac_cpu_data[unit_id];
+	unsigned int tmo;
+
+	HACREG(HACCR) = CR_WMRT | CR_ST | CR_B9;
+	msleep(10);
+	HACREG(HACCR) = CR_ST | CR_B9;
+	for (tmo = 1000; (tmo > 0) && !(HACREG(HACCR) & CR_CR); tmo--)
+		udelay(1);
+
+	if (!tmo)
+		printk(KERN_INFO "hac: reset: AC97 link down!\n");
+	/* settings this bit lets us have a conversation with codec */
+	HACREG(HACACR) |= ACR_TX12ATOM;
+}
+
+static void hac_ac97_coldrst(struct snd_ac97 *ac97)
+{
+	int unit_id = 0 /* ac97->private_data */;
+	struct hac_priv *hac;
+	hac = &hac_cpu_data[unit_id];
+
+	HACREG(HACCR) = 0;
+	HACREG(HACCR) = CR_CDRT | CR_ST | CR_B9;
+	msleep(10);
+	hac_ac97_warmrst(ac97);
+}
+
+static struct snd_ac97_bus_ops hac_ac97_ops = {
+	.read	= hac_ac97_read,
+	.write	= hac_ac97_write,
+	.reset	= hac_ac97_coldrst,
+	.warm_reset = hac_ac97_warmrst,
+};
+
+static int hac_hw_params(struct snd_pcm_substream *substream,
+			 struct snd_pcm_hw_params *params,
+			 struct snd_soc_dai *dai)
+{
+	struct hac_priv *hac = &hac_cpu_data[dai->id];
+	int d = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1;
+
+	switch (params->msbits) {
+	case 16:
+		HACREG(HACACR) |= d ?  ACR_DMARX16 :  ACR_DMATX16;
+		HACREG(HACACR) &= d ? ~ACR_DMARX20 : ~ACR_DMATX20;
+		break;
+	case 20:
+		HACREG(HACACR) &= d ? ~ACR_DMARX16 : ~ACR_DMATX16;
+		HACREG(HACACR) |= d ?  ACR_DMARX20 :  ACR_DMATX20;
+		break;
+	default:
+		pr_debug("hac: invalid depth %d bit\n", params->msbits);
+		return -EINVAL;
+		break;
+	}
+
+	return 0;
+}
+
+#define AC97_RATES	\
+	SNDRV_PCM_RATE_8000_192000
+
+#define AC97_FMTS	\
+	SNDRV_PCM_FMTBIT_S16_LE
+
+static const struct snd_soc_dai_ops hac_dai_ops = {
+	.hw_params	= hac_hw_params,
+};
+
+static struct snd_soc_dai_driver sh4_hac_dai[] = {
+{
+	.name			= "hac-dai.0",
+	.bus_control		= true,
+	.playback = {
+		.rates		= AC97_RATES,
+		.formats	= AC97_FMTS,
+		.channels_min	= 2,
+		.channels_max	= 2,
+	},
+	.capture = {
+		.rates		= AC97_RATES,
+		.formats	= AC97_FMTS,
+		.channels_min	= 2,
+		.channels_max	= 2,
+	},
+	.ops = &hac_dai_ops,
+},
+#ifdef CONFIG_CPU_SUBTYPE_SH7760
+{
+	.name			= "hac-dai.1",
+	.id			= 1,
+	.playback = {
+		.rates		= AC97_RATES,
+		.formats	= AC97_FMTS,
+		.channels_min	= 2,
+		.channels_max	= 2,
+	},
+	.capture = {
+		.rates		= AC97_RATES,
+		.formats	= AC97_FMTS,
+		.channels_min	= 2,
+		.channels_max	= 2,
+	},
+	.ops = &hac_dai_ops,
+
+},
+#endif
+};
+
+static const struct snd_soc_component_driver sh4_hac_component = {
+	.name		= "sh4-hac",
+};
+
+static int hac_soc_platform_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	ret = snd_soc_set_ac97_ops(&hac_ac97_ops);
+	if (ret != 0)
+		return ret;
+
+	return snd_soc_register_component(&pdev->dev, &sh4_hac_component,
+					  sh4_hac_dai, ARRAY_SIZE(sh4_hac_dai));
+}
+
+static int hac_soc_platform_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_component(&pdev->dev);
+	snd_soc_set_ac97_ops(NULL);
+	return 0;
+}
+
+static struct platform_driver hac_pcm_driver = {
+	.driver = {
+			.name = "hac-pcm-audio",
+	},
+
+	.probe = hac_soc_platform_probe,
+	.remove = hac_soc_platform_remove,
+};
+
+module_platform_driver(hac_pcm_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("SuperH onchip HAC (AC97) audio driver");
+MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");