kernel-fxtec-pro1x/sound/aoa/soundbus/i2sbus/i2sbus-core.c
Benjamin Herrenschmidt f9d08de57b [PATCH] aoa: i2sbus: move module parameter declaration up
This patch moves the i2sbus 'force' module parameter declaration to the top of
the file.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-07-10 13:24:18 -07:00

385 lines
10 KiB
C

/*
* i2sbus driver
*
* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
*
* GPL v2, can be found in COPYING.
*/
#include <linux/module.h>
#include <asm/macio.h>
#include <asm/dbdma.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <linux/dma-mapping.h>
#include "../soundbus.h"
#include "i2sbus.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
MODULE_DESCRIPTION("Apple Soundbus: I2S support");
/* for auto-loading, declare that we handle this weird
* string that macio puts into the relevant device */
MODULE_ALIAS("of:Ni2sTi2sC");
static int force;
module_param(force, int, 0444);
MODULE_PARM_DESC(force, "Force loading i2sbus even when"
" no layout-id property is present");
static struct of_device_id i2sbus_match[] = {
{ .name = "i2s" },
{ }
};
static int alloc_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
struct dbdma_command_mem *r,
int numcmds)
{
/* one more for rounding */
r->size = (numcmds+1) * sizeof(struct dbdma_cmd);
/* We use the PCI APIs for now until the generic one gets fixed
* enough or until we get some macio-specific versions
*/
r->space = dma_alloc_coherent(
&macio_get_pci_dev(i2sdev->macio)->dev,
r->size,
&r->bus_addr,
GFP_KERNEL);
if (!r->space) return -ENOMEM;
memset(r->space, 0, r->size);
r->cmds = (void*)DBDMA_ALIGN(r->space);
r->bus_cmd_start = r->bus_addr +
(dma_addr_t)((char*)r->cmds - (char*)r->space);
return 0;
}
static void free_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
struct dbdma_command_mem *r)
{
if (!r->space) return;
dma_free_coherent(&macio_get_pci_dev(i2sdev->macio)->dev,
r->size, r->space, r->bus_addr);
}
static void i2sbus_release_dev(struct device *dev)
{
struct i2sbus_dev *i2sdev;
int i;
i2sdev = container_of(dev, struct i2sbus_dev, sound.ofdev.dev);
if (i2sdev->intfregs) iounmap(i2sdev->intfregs);
if (i2sdev->out.dbdma) iounmap(i2sdev->out.dbdma);
if (i2sdev->in.dbdma) iounmap(i2sdev->in.dbdma);
for (i=0;i<3;i++)
if (i2sdev->allocated_resource[i])
release_and_free_resource(i2sdev->allocated_resource[i]);
free_dbdma_descriptor_ring(i2sdev, &i2sdev->out.dbdma_ring);
free_dbdma_descriptor_ring(i2sdev, &i2sdev->in.dbdma_ring);
for (i=0;i<3;i++)
free_irq(i2sdev->interrupts[i], i2sdev);
i2sbus_control_remove_dev(i2sdev->control, i2sdev);
mutex_destroy(&i2sdev->lock);
kfree(i2sdev);
}
static irqreturn_t i2sbus_bus_intr(int irq, void *devid, struct pt_regs *regs)
{
struct i2sbus_dev *dev = devid;
u32 intreg;
spin_lock(&dev->low_lock);
intreg = in_le32(&dev->intfregs->intr_ctl);
/* acknowledge interrupt reasons */
out_le32(&dev->intfregs->intr_ctl, intreg);
spin_unlock(&dev->low_lock);
return IRQ_HANDLED;
}
/* FIXME: look at device node refcounting */
static int i2sbus_add_dev(struct macio_dev *macio,
struct i2sbus_control *control,
struct device_node *np)
{
struct i2sbus_dev *dev;
struct device_node *child = NULL, *sound = NULL;
int i;
static const char *rnames[] = { "i2sbus: %s (control)",
"i2sbus: %s (tx)",
"i2sbus: %s (rx)" };
static irqreturn_t (*ints[])(int irq, void *devid,
struct pt_regs *regs) = {
i2sbus_bus_intr,
i2sbus_tx_intr,
i2sbus_rx_intr
};
if (strlen(np->name) != 5)
return 0;
if (strncmp(np->name, "i2s-", 4))
return 0;
dev = kzalloc(sizeof(struct i2sbus_dev), GFP_KERNEL);
if (!dev)
return 0;
i = 0;
while ((child = of_get_next_child(np, child))) {
if (strcmp(child->name, "sound") == 0) {
i++;
sound = child;
}
}
if (i == 1) {
u32 *layout_id;
layout_id = (u32*) get_property(sound, "layout-id", NULL);
if (layout_id) {
snprintf(dev->sound.modalias, 32,
"sound-layout-%d", *layout_id);
force = 1;
}
}
/* for the time being, until we can handle non-layout-id
* things in some fabric, refuse to attach if there is no
* layout-id property or we haven't been forced to attach.
* When there are two i2s busses and only one has a layout-id,
* then this depends on the order, but that isn't important
* either as the second one in that case is just a modem. */
if (!force) {
kfree(dev);
return -ENODEV;
}
mutex_init(&dev->lock);
spin_lock_init(&dev->low_lock);
dev->sound.ofdev.node = np;
dev->sound.ofdev.dma_mask = macio->ofdev.dma_mask;
dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.dma_mask;
dev->sound.ofdev.dev.parent = &macio->ofdev.dev;
dev->sound.ofdev.dev.release = i2sbus_release_dev;
dev->sound.attach_codec = i2sbus_attach_codec;
dev->sound.detach_codec = i2sbus_detach_codec;
dev->sound.pcmid = -1;
dev->macio = macio;
dev->control = control;
dev->bus_number = np->name[4] - 'a';
INIT_LIST_HEAD(&dev->sound.codec_list);
for (i=0;i<3;i++) {
dev->interrupts[i] = -1;
snprintf(dev->rnames[i], sizeof(dev->rnames[i]), rnames[i], np->name);
}
for (i=0;i<3;i++) {
int irq = irq_of_parse_and_map(np, i);
if (request_irq(irq, ints[i], 0, dev->rnames[i], dev))
goto err;
dev->interrupts[i] = irq;
}
for (i=0;i<3;i++) {
if (of_address_to_resource(np, i, &dev->resources[i]))
goto err;
/* if only we could use our resource dev->resources[i]...
* but request_resource doesn't know about parents and
* contained resources... */
dev->allocated_resource[i] =
request_mem_region(dev->resources[i].start,
dev->resources[i].end -
dev->resources[i].start + 1,
dev->rnames[i]);
if (!dev->allocated_resource[i]) {
printk(KERN_ERR "i2sbus: failed to claim resource %d!\n", i);
goto err;
}
}
/* should do sanity checking here about length of them */
dev->intfregs = ioremap(dev->resources[0].start,
dev->resources[0].end-dev->resources[0].start+1);
dev->out.dbdma = ioremap(dev->resources[1].start,
dev->resources[1].end-dev->resources[1].start+1);
dev->in.dbdma = ioremap(dev->resources[2].start,
dev->resources[2].end-dev->resources[2].start+1);
if (!dev->intfregs || !dev->out.dbdma || !dev->in.dbdma)
goto err;
if (alloc_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring,
MAX_DBDMA_COMMANDS))
goto err;
if (alloc_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring,
MAX_DBDMA_COMMANDS))
goto err;
if (i2sbus_control_add_dev(dev->control, dev)) {
printk(KERN_ERR "i2sbus: control layer didn't like bus\n");
goto err;
}
if (soundbus_add_one(&dev->sound)) {
printk(KERN_DEBUG "i2sbus: device registration error!\n");
goto err;
}
/* enable this cell */
i2sbus_control_cell(dev->control, dev, 1);
i2sbus_control_enable(dev->control, dev);
i2sbus_control_clock(dev->control, dev, 1);
return 1;
err:
for (i=0;i<3;i++)
if (dev->interrupts[i] != -1)
free_irq(dev->interrupts[i], dev);
free_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring);
free_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring);
if (dev->intfregs) iounmap(dev->intfregs);
if (dev->out.dbdma) iounmap(dev->out.dbdma);
if (dev->in.dbdma) iounmap(dev->in.dbdma);
for (i=0;i<3;i++)
if (dev->allocated_resource[i])
release_and_free_resource(dev->allocated_resource[i]);
mutex_destroy(&dev->lock);
kfree(dev);
return 0;
}
static int i2sbus_probe(struct macio_dev* dev, const struct of_device_id *match)
{
struct device_node *np = NULL;
int got = 0, err;
struct i2sbus_control *control = NULL;
err = i2sbus_control_init(dev, &control);
if (err)
return err;
if (!control) {
printk(KERN_ERR "i2sbus_control_init API breakage\n");
return -ENODEV;
}
while ((np = of_get_next_child(dev->ofdev.node, np))) {
if (device_is_compatible(np, "i2sbus") ||
device_is_compatible(np, "i2s-modem")) {
got += i2sbus_add_dev(dev, control, np);
}
}
if (!got) {
/* found none, clean up */
i2sbus_control_destroy(control);
return -ENODEV;
}
dev->ofdev.dev.driver_data = control;
return 0;
}
static int i2sbus_remove(struct macio_dev* dev)
{
struct i2sbus_control *control = dev->ofdev.dev.driver_data;
struct i2sbus_dev *i2sdev, *tmp;
list_for_each_entry_safe(i2sdev, tmp, &control->list, item)
soundbus_remove_one(&i2sdev->sound);
return 0;
}
#ifdef CONFIG_PM
static int i2sbus_suspend(struct macio_dev* dev, pm_message_t state)
{
struct i2sbus_control *control = dev->ofdev.dev.driver_data;
struct codec_info_item *cii;
struct i2sbus_dev* i2sdev;
int err, ret = 0;
list_for_each_entry(i2sdev, &control->list, item) {
/* Notify Alsa */
if (i2sdev->sound.pcm) {
/* Suspend PCM streams */
snd_pcm_suspend_all(i2sdev->sound.pcm);
/* Probably useless as we handle
* power transitions ourselves */
snd_power_change_state(i2sdev->sound.pcm->card,
SNDRV_CTL_POWER_D3hot);
}
/* Notify codecs */
list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
err = 0;
if (cii->codec->suspend)
err = cii->codec->suspend(cii, state);
if (err)
ret = err;
}
}
return ret;
}
static int i2sbus_resume(struct macio_dev* dev)
{
struct i2sbus_control *control = dev->ofdev.dev.driver_data;
struct codec_info_item *cii;
struct i2sbus_dev* i2sdev;
int err, ret = 0;
list_for_each_entry(i2sdev, &control->list, item) {
/* Notify codecs so they can re-initialize */
list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
err = 0;
if (cii->codec->resume)
err = cii->codec->resume(cii);
if (err)
ret = err;
}
/* Notify Alsa */
if (i2sdev->sound.pcm) {
/* Same comment as above, probably useless */
snd_power_change_state(i2sdev->sound.pcm->card,
SNDRV_CTL_POWER_D0);
}
}
return ret;
}
#endif /* CONFIG_PM */
static int i2sbus_shutdown(struct macio_dev* dev)
{
return 0;
}
static struct macio_driver i2sbus_drv = {
.name = "soundbus-i2s",
.owner = THIS_MODULE,
.match_table = i2sbus_match,
.probe = i2sbus_probe,
.remove = i2sbus_remove,
#ifdef CONFIG_PM
.suspend = i2sbus_suspend,
.resume = i2sbus_resume,
#endif
.shutdown = i2sbus_shutdown,
};
static int __init soundbus_i2sbus_init(void)
{
return macio_register_driver(&i2sbus_drv);
}
static void __exit soundbus_i2sbus_exit(void)
{
macio_unregister_driver(&i2sbus_drv);
}
module_init(soundbus_i2sbus_init);
module_exit(soundbus_i2sbus_exit);