[PATCH 9/9] sound: Add support for Freescale MPC5200 AC97 interface.
Sylvain Munaut
tnt at 246tNt.com
Sun May 13 06:31:57 EST 2007
Not quite a clean driver, but it get things done (well,
mostly).
Only included to be able to test functionalityi/usage of
the BestComm driver.
Signed-off-by: Sylvain Munaut <tnt at 246tNt.com>
---
sound/ppc/Kconfig | 16 +
sound/ppc/Makefile | 3 +
sound/ppc/mpc52xx_ac97.c | 870 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 889 insertions(+), 0 deletions(-)
create mode 100644 sound/ppc/mpc52xx_ac97.c
diff --git a/sound/ppc/Kconfig b/sound/ppc/Kconfig
index a3fb149..afd58f7 100644
--- a/sound/ppc/Kconfig
+++ b/sound/ppc/Kconfig
@@ -33,3 +33,19 @@ config SND_POWERMAC_AUTO_DRC
option.
endmenu
+
+
+# ALSA ppc drivers
+
+menu "ALSA PPC devices"
+ depends on SND!=n && PPC
+
+config SND_PPC_MPC52xx_AC97
+ tristate "Freescale MPC52xx AC97 interface support"
+ depends on SND && PPC_MPC52xx
+ select SND_AC97_CODEC
+ help
+ Say Y or M if you want to support any AC97 codec attached to
+ the Freescqle MPC52xx AC97 interface.
+
+endmenu
diff --git a/sound/ppc/Makefile b/sound/ppc/Makefile
index 4d95c65..c29cb9b 100644
--- a/sound/ppc/Makefile
+++ b/sound/ppc/Makefile
@@ -4,6 +4,9 @@
#
snd-powermac-objs := powermac.o pmac.o awacs.o burgundy.o daca.o tumbler.o keywest.o beep.o
+snd-mpc52xx-ac97-objs := mpc52xx_ac97.o
# Toplevel Module Dependency
obj-$(CONFIG_SND_POWERMAC) += snd-powermac.o
+
+obj-$(CONFIG_SND_PPC_MPC52xx_AC97) += snd-mpc52xx-ac97.o
diff --git a/sound/ppc/mpc52xx_ac97.c b/sound/ppc/mpc52xx_ac97.c
new file mode 100644
index 0000000..20e2bf8
--- /dev/null
+++ b/sound/ppc/mpc52xx_ac97.c
@@ -0,0 +1,870 @@
+/*
+ * Driver for the PSC of the Freescale MPC52xx configured as AC97 interface
+ *
+ *
+ * Copyright (C) 2006 Sylvain Munaut <tnt at 246tNt.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#define DEBUG
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/ac97_codec.h>
+
+#include <asm/of_platform.h>
+#include <linux/dma-mapping.h>
+#include <asm/mpc52xx_psc.h>
+
+#include <sysdev/bestcomm/bestcomm.h>
+#include <sysdev/bestcomm/gen_bd.h>
+
+
+#define DRV_NAME "mpc52xx-psc-ac97"
+
+
+/* ======================================================================== */
+/* Structs / Defines */
+/* ======================================================================== */
+
+/* Private structure */
+struct mpc52xx_ac97_priv {
+ struct device *dev;
+ resource_size_t mem_start;
+ resource_size_t mem_len;
+ int irq;
+ struct mpc52xx_psc __iomem *psc;
+
+ struct bcom_task *tsk_tx;
+ spinlock_t dma_lock;
+
+ struct snd_card *card;
+ struct snd_pcm *pcm;
+ struct snd_ac97 *ac97;
+
+ struct snd_pcm_substream *substream_playback;
+
+ int period_byte_size;
+ u32 period_start, period_end, period_next_p;
+};
+
+/* Register bit definition (AC97 mode specific) */
+#define PSC_AC97_SLOT_BIT(n) (1<<(12-n))
+#define PSC_AC97_SLOTS_XMIT_SHIFT 16
+#define PSC_AC97_SLOTS_RECV_SHIFT 0
+
+/* Bestcomm options */
+#define AC97_TX_NUM_BD 32
+#define AC97_RX_NUM_BD 32
+
+#if 0
+static u32* buffers_va[AC97_TX_NUM_BD];
+static u32 buffers_pa[AC97_TX_NUM_BD];
+#endif
+
+
+/* ======================================================================== */
+/* Buffer handling */
+/* ======================================================================== */
+
+#if 0
+static void
+mpc52xx_ac97_tx_bufalloc(struct mpc52xx_ac97_priv *priv)
+{
+ int i;
+
+ if (buffers_va[0])
+ return;
+
+ buffers_va[0] = dma_alloc_coherent(priv->dev, AC97_TX_NUM_BD * 1024, &buffers_pa[0], GFP_KERNEL);
+
+ for (i=1; i<AC97_TX_NUM_BD; i++) {
+ buffers_va[i] = buffers_va[i-1] + 1024;
+ buffers_pa[i] = buffers_pa[i-1] + 1024;
+ }
+
+ printk(KERN_INFO "Buffer alloc %08x %08x\n", buffers_va[0], buffers_pa[0]);
+}
+
+static void
+mpc52xx_ac97_tx_bufrelease(struct mpc52xx_ac97_priv *priv)
+{
+ if (buffers_va[0]) {
+ dma_free_coherent(priv->dev, AC97_TX_NUM_BD * 1024, buffers_va[0], buffers_pa[0]);
+ buffers_va[0] = NULL;
+ }
+}
+#endif
+
+static int
+mpc52xx_ac97_tx_fill(struct mpc52xx_ac97_priv *priv)
+{
+ struct snd_pcm_runtime *rt;
+
+ u32 dma_data_ptr;
+
+ rt = priv->substream_playback->runtime;
+
+ dma_data_ptr = virt_to_phys(rt->dma_area);
+
+ priv->period_byte_size = frames_to_bytes(rt, rt->period_size);
+ priv->period_start = dma_data_ptr;
+ priv->period_end = dma_data_ptr + priv->period_byte_size * rt->periods;
+ priv->period_next_p = dma_data_ptr;
+
+ spin_lock(&priv->dma_lock);
+ while (!bcom_queue_full(priv->tsk_tx)) {
+ struct bcom_gen_bd *bd;
+
+ /* Submit a new one */
+ bd = (struct bcom_gen_bd *) bcom_prepare_next_buffer(priv->tsk_tx);
+ bd->status = priv->period_byte_size;
+ bd->buf_pa = priv->period_next_p;
+ bcom_submit_next_buffer(priv->tsk_tx, NULL);
+
+ /* Next pointer */
+ priv->period_next_p += priv->period_byte_size;
+ if (priv->period_next_p >= priv->period_end)
+ priv->period_next_p = priv->period_start;
+ }
+ spin_unlock(&priv->dma_lock);
+
+ return 0;
+}
+
+
+/* ======================================================================== */
+/* ISR routine */
+/* ======================================================================== */
+
+static irqreturn_t
+mpc52xx_ac97_tx_irq(int irq, void *dev_id)
+{
+ struct mpc52xx_ac97_priv *priv = dev_id;
+ struct snd_pcm_runtime *rt;
+ struct bcom_gen_bd *bd;
+
+ rt = priv->substream_playback->runtime;
+
+ if (!bcom_buffer_done(priv->tsk_tx)) {
+ bcom_dump_status();
+ bcom_dump_task(priv->tsk_tx->tasknum);
+ bcom_dump_bdring(priv->tsk_tx);
+ bcom_disable(priv->tsk_tx);
+ }
+
+ spin_lock(&priv->dma_lock);
+ while (bcom_buffer_done(priv->tsk_tx)) {
+ /* Get the buffer back */
+ bcom_retrieve_buffer(priv->tsk_tx, NULL, NULL);
+
+ /* Submit a new one */
+ bd = (struct bcom_gen_bd *) bcom_prepare_next_buffer(priv->tsk_tx);
+ bd->status = priv->period_byte_size;
+ bd->buf_pa = priv->period_next_p;
+ bcom_submit_next_buffer(priv->tsk_tx, NULL);
+ bcom_enable(priv->tsk_tx);
+
+ /* Next pointer */
+ priv->period_next_p += priv->period_byte_size;
+ if (priv->period_next_p >= priv->period_end)
+ priv->period_next_p = priv->period_start;
+ }
+ spin_unlock(&priv->dma_lock);
+
+ snd_pcm_period_elapsed(priv->substream_playback);
+
+ return IRQ_HANDLED;
+}
+
+
+static irqreturn_t
+mpc52xx_ac97_irq(int irq, void *dev_id)
+{
+ struct mpc52xx_ac97_priv *priv = dev_id;
+
+ static int icnt = 0;
+ #if 0
+ {
+ unsigned int val;
+// val = in_be32(&priv->psc->ac97_data);
+ printk(KERN_INFO "mpc52xx_ac97_irq fired (isr=%04x, status=%04x) %08x\n", in_be16(&priv->psc->mpc52xx_psc_imr), in_be16(&priv->psc->mpc52xx_psc_status), val);
+ out_8(&priv->psc->command,MPC52xx_PSC_RST_ERR_STAT);
+ }
+ #endif
+
+ /* Anti Crash during dev ;) */
+ #if 1
+ if ((icnt++) > 5000)
+ out_be16(&priv->psc->mpc52xx_psc_imr, 0);
+ #endif
+
+ /* Print statuts */
+ printk(KERN_DEBUG "isr: %04x", in_be16(&priv->psc->mpc52xx_psc_imr));
+ out_8(&priv->psc->command,MPC52xx_PSC_RST_ERR_STAT);
+
+ return IRQ_HANDLED;
+}
+
+/* ======================================================================== */
+/* PCM interface */
+/* ======================================================================== */
+
+/* HW desc */
+
+static struct snd_pcm_hardware mpc52xx_ac97_hw = {
+ .info = SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID,
+ .formats = SNDRV_PCM_FMTBIT_S32_BE,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .rate_min = 8000,
+ .rate_max = 48000,
+ .channels_min = 1,
+ .channels_max = 2, /* Support for more ? */
+ .buffer_bytes_max = 1024*1024,
+ .period_bytes_min = 512,
+ .period_bytes_max = 16*1024,
+ .periods_min = 8,
+ .periods_max = 1024,
+ .fifo_size = 512,
+};
+
+
+/* Playback */
+
+static int
+mpc52xx_ac97_playback_open(struct snd_pcm_substream *substream)
+{
+ struct mpc52xx_ac97_priv *priv = substream->pcm->private_data;
+
+ dev_dbg(priv->dev, "mpc52xx_ac97_playback_open(%p)\n", substream);
+
+ substream->runtime->hw = mpc52xx_ac97_hw;
+
+ priv->substream_playback = substream;
+
+ return 0; /* FIXME */
+}
+
+static int
+mpc52xx_ac97_playback_close(struct snd_pcm_substream *substream)
+{
+ struct mpc52xx_ac97_priv *priv = substream->pcm->private_data;
+ dev_dbg(priv->dev, "mpc52xx_ac97_playback_close(%p)\n", substream);
+ priv->substream_playback = NULL;
+ return 0; /* FIXME */
+}
+
+static int
+mpc52xx_ac97_playback_prepare(struct snd_pcm_substream *substream)
+{
+ struct mpc52xx_ac97_priv *priv = substream->pcm->private_data;
+
+ dev_dbg(priv->dev, "mpc52xx_ac97_playback_prepare(%p)\n", substream);
+
+ /* FIXME, need a spinlock to protect access */
+ if (substream->runtime->channels == 1)
+ out_be32(&priv->psc->ac97_slots, 0x01000000);
+ else
+ out_be32(&priv->psc->ac97_slots, 0x03000000);
+
+ snd_ac97_set_rate(priv->ac97, AC97_PCM_FRONT_DAC_RATE, substream->runtime->rate);
+
+ return 0; /* FIXME */
+}
+
+
+/* Capture */
+
+static int
+mpc52xx_ac97_capture_open(struct snd_pcm_substream *substream)
+{
+ struct mpc52xx_ac97_priv *priv = substream->pcm->private_data;
+ return 0; /* FIXME */
+}
+
+static int
+mpc52xx_ac97_capture_close(struct snd_pcm_substream *substream)
+{
+ struct mpc52xx_ac97_priv *priv = substream->pcm->private_data;
+ return 0; /* FIXME */
+}
+
+static int
+mpc52xx_ac97_capture_prepare(struct snd_pcm_substream *substream)
+{
+ struct mpc52xx_ac97_priv *priv = substream->pcm->private_data;
+ return 0; /* FIXME */
+}
+
+
+/* Common */
+
+static int
+mpc52xx_ac97_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct mpc52xx_ac97_priv *priv = substream->pcm->private_data;
+ int rv;
+
+ dev_dbg(priv->dev, "mpc52xx_ac97_hw_params(%p)\n", substream);
+
+ rv = snd_pcm_lib_malloc_pages(substream,
+ params_buffer_bytes(params));
+ if (rv < 0) {
+ printk(KERN_ERR "hw params failes\n"); /* FIXME */
+ return rv;
+ }
+
+ // mpc52xx_ac97_tx_bufalloc(priv);
+
+ printk(KERN_DEBUG "%d %d %d\n", params_buffer_bytes(params), params_period_bytes(params), params_periods(params));
+
+ return 0;
+}
+
+static int
+mpc52xx_ac97_hw_free(struct snd_pcm_substream *substream)
+{
+ struct mpc52xx_ac97_priv *priv = substream->pcm->private_data;
+
+ dev_dbg(priv->dev, "mpc52xx_ac97_hw_free(%p)\n", substream);
+ // mpc52xx_ac97_tx_bufrelease(priv);
+
+ return snd_pcm_lib_free_pages(substream);
+}
+
+static int
+mpc52xx_ac97_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct mpc52xx_ac97_priv *priv = substream->pcm->private_data;
+ int rv = 0;
+
+ dev_dbg(priv->dev, "mpc52xx_ac97_trigger(%p,%d)\n", substream, cmd);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ /* Enable TX taks */
+ bcom_gen_bd_tx_reset(priv->tsk_tx);
+ mpc52xx_ac97_tx_fill(priv);
+ bcom_enable(priv->tsk_tx);
+// out_be16(&priv->psc->mpc52xx_psc_imr, 0x0800); // 0x0100
+// out_be16(&priv->psc->mpc52xx_psc_imr, 0x0100); // 0x0100
+ /* FIXME: Shouldn't we check for overrun too ? */
+ /* also, shouldn't we just activate TX here ? */
+
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ /* Disable TX task */
+ bcom_disable(priv->tsk_tx);
+ out_be16(&priv->psc->mpc52xx_psc_imr, 0x0000); // 0x0100
+
+ break;
+
+ default:
+ rv = -EINVAL;
+ }
+
+ /* FIXME */
+ return rv;
+}
+
+static snd_pcm_uframes_t
+mpc52xx_ac97_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct mpc52xx_ac97_priv *priv = substream->pcm->private_data;
+ u32 count;
+
+// dev_dbg(priv->dev, "mpc52xx_ac97_pointer(%p)\n", substream);
+
+ count = priv->tsk_tx->bd[priv->tsk_tx->outdex].data[0] - priv->period_start;
+
+ return bytes_to_frames(runtime, count);
+}
+
+
+/* Ops */
+
+static struct snd_pcm_ops mpc52xx_ac97_playback_ops = {
+ .open = mpc52xx_ac97_playback_open,
+ .close = mpc52xx_ac97_playback_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = mpc52xx_ac97_hw_params,
+ .hw_free = mpc52xx_ac97_hw_free,
+ .prepare = mpc52xx_ac97_playback_prepare,
+ .trigger = mpc52xx_ac97_trigger,
+ .pointer = mpc52xx_ac97_pointer,
+};
+
+static struct snd_pcm_ops mpc52xx_ac97_capture_ops = {
+ .open = mpc52xx_ac97_capture_open,
+ .close = mpc52xx_ac97_capture_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = mpc52xx_ac97_hw_params,
+ .hw_free = mpc52xx_ac97_hw_free,
+ .prepare = mpc52xx_ac97_capture_prepare,
+ .trigger = mpc52xx_ac97_trigger,
+ .pointer = mpc52xx_ac97_pointer,
+};
+
+
+/* ======================================================================== */
+/* AC97 Bus interface */
+/* ======================================================================== */
+
+static unsigned short
+mpc52xx_ac97_bus_read(struct snd_ac97 *ac97, unsigned short reg)
+{
+ struct mpc52xx_ac97_priv *priv = ac97->private_data;
+ int timeout;
+ unsigned int val;
+
+// dev_dbg(priv->dev, "ac97 read: reg %04x\n", reg);
+
+ /* Wait for it to be ready */
+ timeout = 1000;
+ while ((--timeout) && (in_be16(&priv->psc->mpc52xx_psc_status) &
+ MPC52xx_PSC_SR_CMDSEND) )
+ udelay(10);
+
+ if (!timeout) {
+ printk(KERN_ERR DRV_NAME ": timeout on ac97 bus (rdy)\n");
+ return 0xffff;
+ }
+
+ /* Do the read */
+ out_be32(&priv->psc->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));
+
+ /* Wait for the answer */
+ timeout = 1000;
+ while ((--timeout) && !(in_be16(&priv->psc->mpc52xx_psc_status) &
+ MPC52xx_PSC_SR_DATA_VAL) )
+ udelay(10);
+
+ if (!timeout) {
+ printk(KERN_ERR DRV_NAME ": timeout on ac97 read (val)\n");
+ return 0xffff;
+ }
+
+ /* Get the data */
+ val = in_be32(&priv->psc->ac97_data);
+ if ( ((val>>24) & 0x7f) != reg ) {
+ printk(KERN_ERR DRV_NAME ": reg echo error on ac97 read\n");
+ return 0xffff;
+ }
+ val = (val >> 8) & 0xffff;
+
+// dev_dbg(priv->dev, "ac97 read ok: reg %04x val %04x\n",
+// reg, val);
+
+ return (unsigned short) val;
+}
+
+static void
+mpc52xx_ac97_bus_write(struct snd_ac97 *ac97,
+ unsigned short reg, unsigned short val)
+{
+ struct mpc52xx_ac97_priv *priv = ac97->private_data;
+ int timeout;
+
+// dev_dbg(priv->dev, "ac97 write: reg %04x val %04x\n",
+// reg, val);
+
+ /* Wait for it to be ready */
+ timeout = 1000;
+ while ((--timeout) && (in_be16(&priv->psc->mpc52xx_psc_status) &
+ MPC52xx_PSC_SR_CMDSEND) )
+ udelay(10);
+
+ if (!timeout) {
+ printk(KERN_ERR DRV_NAME ": timeout on ac97 write\n");
+ return;
+ }
+
+ /* Write data */
+ out_be32(&priv->psc->ac97_cmd, ((reg & 0x7f) << 24) | (val << 8));
+}
+
+static void
+mpc52xx_ac97_bus_reset(struct snd_ac97 *ac97)
+{
+ struct mpc52xx_ac97_priv *priv = ac97->private_data;
+
+ dev_dbg(priv->dev, "ac97 codec reset\n");
+
+ /* Do a cold reset */
+ out_8(&priv->psc->op1, 0x03);
+ udelay(10);
+ out_8(&priv->psc->op0, 0x02);
+ udelay(50);
+
+ /* PSC recover from cold reset (cfr user manual, not sure if useful) */
+ out_be32(&priv->psc->sicr, in_be32(&priv->psc->sicr));
+}
+
+
+static struct snd_ac97_bus_ops mpc52xx_ac97_bus_ops = {
+ .read = mpc52xx_ac97_bus_read,
+ .write = mpc52xx_ac97_bus_write,
+ .reset = mpc52xx_ac97_bus_reset,
+};
+
+
+/* ======================================================================== */
+/* Sound driver setup */
+/* ======================================================================== */
+
+static int
+mpc52xx_ac97_setup_pcm(struct mpc52xx_ac97_priv *priv)
+{
+ int rv;
+
+ rv = snd_pcm_new(priv->card, DRV_NAME "-pcm", 0, 1, 1, &priv->pcm);
+ if (rv) {
+ printk(KERN_ERR DRV_NAME ": snd_pcm_new failed\n");
+ return rv;
+ }
+
+ rv = snd_pcm_lib_preallocate_pages_for_all(priv->pcm,
+ SNDRV_DMA_TYPE_CONTINUOUS, snd_dma_continuous_data(GFP_KERNEL),
+ 128*1024, 128*1024);
+ if (rv) {
+ printk(KERN_ERR DRV_NAME
+ ": snd_pcm_lib_preallocate_pages_for_all failed\n");
+ return rv;
+ }
+
+ snd_pcm_set_ops(priv->pcm, SNDRV_PCM_STREAM_PLAYBACK,
+ &mpc52xx_ac97_playback_ops);
+ snd_pcm_set_ops(priv->pcm, SNDRV_PCM_STREAM_CAPTURE,
+ &mpc52xx_ac97_capture_ops);
+
+ priv->pcm->private_data = priv;
+ priv->pcm->info_flags = 0;
+
+ strcpy(priv->pcm->name, "Freescale MPC52xx PSC-AC97 PCM");
+
+ return 0;
+}
+
+static int
+mpc52xx_ac97_setup_mixer(struct mpc52xx_ac97_priv *priv)
+{
+ struct snd_ac97_bus *ac97_bus;
+ struct snd_ac97_template ac97_template;
+ int rv;
+
+ rv = snd_ac97_bus(priv->card, 0, &mpc52xx_ac97_bus_ops, NULL, &ac97_bus);
+ if (rv) {
+ printk(KERN_ERR DRV_NAME ": snd_ac97_bus failed\n");
+ return rv;
+ }
+
+ memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
+ ac97_template.private_data = priv;
+
+ rv = snd_ac97_mixer(ac97_bus, &ac97_template, &priv->ac97);
+ if (rv) {
+ printk(KERN_ERR DRV_NAME ": snd_ac97_mixer failed\n");
+ return rv;
+ }
+
+ return 0;
+}
+
+
+static int
+mpc52xx_ac97_hwinit(struct mpc52xx_ac97_priv *priv)
+{
+ /* Reset everything first by safety */
+ out_8(&priv->psc->command,MPC52xx_PSC_RST_RX);
+ out_8(&priv->psc->command,MPC52xx_PSC_RST_TX);
+ out_8(&priv->psc->command,MPC52xx_PSC_RST_ERR_STAT);
+
+ /* Do a cold reset of codec */
+ out_8(&priv->psc->op1, 0x03);
+ udelay(10);
+ out_8(&priv->psc->op0, 0x02);
+ udelay(50);
+
+ /* Configure AC97 enhanced mode */
+ out_be32(&priv->psc->sicr, 0x03010000);
+
+ /* No slots active */
+ out_be32(&priv->psc->ac97_slots, 0x00000000);
+
+ /* No IRQ */
+ out_be16(&priv->psc->mpc52xx_psc_imr, 0x0000);
+
+ /* FIFO levels */
+ out_8(&priv->psc->rfcntl, 0x07);
+ out_8(&priv->psc->tfcntl, 0x07);
+ out_be16(&priv->psc->rfalarm, 0x80);
+ out_be16(&priv->psc->tfalarm, 0x80);
+
+ /* Go */
+ out_8(&priv->psc->command,MPC52xx_PSC_TX_ENABLE);
+ out_8(&priv->psc->command,MPC52xx_PSC_RX_ENABLE);
+
+ return 0;
+}
+
+static int
+mpc52xx_ac97_hwshutdown(struct mpc52xx_ac97_priv *priv)
+{
+ /* No IRQ */
+ out_be16(&priv->psc->mpc52xx_psc_imr, 0x0000);
+
+ /* Disable TB & RX */
+ out_8(&priv->psc->command,MPC52xx_PSC_RST_RX);
+ out_8(&priv->psc->command,MPC52xx_PSC_RST_TX);
+
+ /* FIXME : Reset or put codec in low power ? */
+
+ return 0;
+}
+
+
+/* ======================================================================== */
+/* OF Platform Driver */
+/* ======================================================================== */
+
+static int __devinit
+mpc52xx_ac97_probe(struct of_device *op, const struct of_device_id *match)
+{
+ struct device_node *dn = op->node;
+ struct mpc52xx_ac97_priv *priv;
+ struct snd_card *card;
+ struct resource res;
+ int rv;
+
+ dev_dbg(&op->dev, "probing MPC52xx PSC AC97 driver\n");
+
+ /* Get card structure */
+ rv = -ENOMEM;
+ card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
+ THIS_MODULE, sizeof(struct mpc52xx_ac97_priv));
+ if (!card)
+ goto err_early;
+
+ priv = card->private_data;
+
+ /* Init our private structure */
+ priv->card = card;
+ priv->dev = &op->dev;
+
+ /* Get resources (mem,irq,...) */
+ rv = of_address_to_resource(dn, 0, &res);
+ if (rv)
+ goto err_early;
+
+ priv->mem_start = res.start;
+ priv->mem_len = res.end - res.start + 1;
+
+ if (!request_mem_region(priv->mem_start, priv->mem_len, DRV_NAME)) {
+ printk(KERN_ERR DRV_NAME ": request_mem_region failed\n");
+ rv = -EBUSY;
+ goto err_early;
+ }
+
+ priv->psc = ioremap(priv->mem_start, priv->mem_len);
+ if (!priv->psc) {
+ printk(KERN_ERR DRV_NAME ": ioremap failed\n");
+ rv = -ENOMEM;
+ goto err_iomap;
+ }
+
+ priv->irq = irq_of_parse_and_map(dn, 0);
+ if (priv->irq == NO_IRQ) {
+ printk(KERN_ERR DRV_NAME ": irq_of_parse_and_map failed\n");
+ rv = -EBUSY;
+ goto err_irqmap;
+ }
+
+ /* Setup Bestcomm tasks */
+ spin_lock_init(&priv->dma_lock);
+
+ priv->tsk_tx = bcom_gen_bd_tx_init(AC97_TX_NUM_BD,
+ priv->mem_start + offsetof(struct mpc52xx_psc,
+ tfdata),
+ 12, /* initiator : FIXME */
+ 2); /* ipr : FIXME */
+ if (!priv->tsk_tx) {
+ printk(KERN_ERR DRV_NAME ": bcom_gen_bd_tx_init failed\n");
+ rv = -ENOMEM;
+ goto err_bcomm;
+ }
+
+ /* Low level HW Init */
+ mpc52xx_ac97_hwinit(priv);
+
+ /* Request IRQ now that we're 'stable' */
+ rv = request_irq(priv->irq, mpc52xx_ac97_irq, 0, DRV_NAME, priv);
+ if (rv < 0) {
+ printk(KERN_ERR DRV_NAME ": request_irq failed\n");
+ goto err_irqreq;
+ }
+
+ rv = request_irq(bcom_get_task_irq(priv->tsk_tx),
+ mpc52xx_ac97_tx_irq, 0, DRV_NAME "_tx", priv);
+ if (rv < 0) {
+ printk(KERN_ERR DRV_NAME ": request_irq failed\n");
+ goto err_txirqreq;
+ }
+
+ /* Prepare sound stuff */
+ rv = mpc52xx_ac97_setup_mixer(priv);
+ if (rv)
+ goto err_late;
+
+ rv = mpc52xx_ac97_setup_pcm(priv);
+ if (rv)
+ goto err_late;
+
+ /* Finally register the card */
+ snprintf(card->shortname, sizeof(card->shortname), DRV_NAME);
+ snprintf(card->longname, sizeof(card->longname),
+ "Freescale MPC52xx PSC-AC97 (%s)", card->mixername);
+
+ rv = snd_card_register(card);
+ if (rv) {
+ printk(KERN_ERR DRV_NAME ": snd_card_register failed\n");
+ goto err_late;
+ }
+
+ dev_set_drvdata(&op->dev, priv);
+
+ return 0;
+
+err_late:
+ free_irq(bcom_get_task_irq(priv->tsk_tx), priv);
+err_txirqreq:
+ free_irq(priv->irq, priv);
+err_irqreq:
+ bcom_gen_bd_tx_release(priv->tsk_tx);
+err_bcomm:
+ mpc52xx_ac97_hwshutdown(priv);
+ irq_dispose_mapping(priv->irq);
+err_irqmap:
+ iounmap(priv->psc);
+err_iomap:
+ release_mem_region(priv->mem_start, priv->mem_len);
+err_early:
+ if (card)
+ snd_card_free(card);
+ return rv;
+}
+
+static int
+mpc52xx_ac97_remove(struct of_device *op)
+{
+ struct mpc52xx_ac97_priv *priv;
+
+ dev_dbg(&op->dev, "removing MPC52xx PSC AC97 driver\n");
+
+ priv = dev_get_drvdata(&op->dev);
+ if (priv) {
+ /* Sound subsys shutdown */
+ snd_card_free(priv->card);
+
+ /* Low level HW shutdown */
+ mpc52xx_ac97_hwshutdown(priv);
+
+ /* Release bestcomm tasks */
+ free_irq(bcom_get_task_irq(priv->tsk_tx), priv);
+ bcom_gen_bd_tx_release(priv->tsk_tx);
+
+ /* Release resources */
+ iounmap(priv->psc);
+ free_irq(priv->irq, priv);
+ irq_dispose_mapping(priv->irq);
+ release_mem_region(priv->mem_start, priv->mem_len);
+ }
+
+ dev_set_drvdata(&op->dev, NULL);
+
+ return 0;
+}
+
+
+static struct of_device_id mpc52xx_ac97_of_match[] = {
+ {
+ .type = "sound",
+ .compatible = "mpc5200b-psc-ac97", /* B only for now */
+ },
+};
+/* Prevent autoload during developpment phase ... */
+/* MODULE_DEVICE_TABLE(of, mpc52xx_ac97_of_match); */
+
+
+static struct of_platform_driver mpc52xx_ac97_of_driver = {
+ .owner = THIS_MODULE,
+ .name = DRV_NAME,
+ .match_table = mpc52xx_ac97_of_match,
+ .probe = mpc52xx_ac97_probe,
+ .remove = mpc52xx_ac97_remove,
+ .driver = {
+ .name = DRV_NAME,
+ },
+};
+
+
+/* ======================================================================== */
+/* Module */
+/* ======================================================================== */
+
+static int __init
+mpc52xx_ac97_init(void)
+{
+ int rv;
+
+ /* FIXME BIG FAT EFIKA HACK */
+ {
+ void *mbar;
+ mbar = ioremap(0xf0000000, 0x100000);
+ printk(KERN_INFO "EFIKA HACK: port_config %08x\n", in_be32(mbar + 0xb00));
+ out_be32(mbar + 0xb00, 0x01051124);
+ printk(KERN_INFO "EFIKA HACK: port_config %08x\n", in_be32(mbar + 0xb00));
+ iounmap(mbar);
+ }
+ /* ------------------------ */
+
+ printk(KERN_INFO "Sound: MPC52xx PSC AC97 driver\n");
+
+ rv = of_register_platform_driver(&mpc52xx_ac97_of_driver);
+ if (rv) {
+ printk(KERN_ERR DRV_NAME ": "
+ "of_register_platform_driver failed (%i)\n", rv);
+ return rv;
+ }
+
+ return 0;
+}
+
+static void __exit
+mpc52xx_ac97_exit(void)
+{
+ of_unregister_platform_driver(&mpc52xx_ac97_of_driver);
+}
+
+module_init(mpc52xx_ac97_init);
+module_exit(mpc52xx_ac97_exit);
+
+MODULE_AUTHOR("Sylvain Munaut <tnt at 246tNt.com>");
+MODULE_DESCRIPTION(DRV_NAME ": Freescale MPC52xx PSC AC97 driver");
+MODULE_LICENSE("GPL");
+
--
1.5.1.2
More information about the Linuxppc-dev
mailing list