--- /dev/null
+/*
+ * Hitachi Audio Controller (AC97) support for SH7760/SH7780
+ *
+ * Copyright (c) 2007 Manuel Lauss <mano@roarinelk.homelinux.net>
+ * licensed under the terms outlined in the file COPYING at the root
+ * of the linux kernel sources.
+ *
+ * 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)
+{
+ 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");
+MODULE_DESCRIPTION("SuperH onchip HAC (AC97) audio driver");
+MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");
Code Review / kvmfornfv.git / blobdiff