--- /dev/null
- int i, layout = 0, rlen;
+ /*
+ * i2sbus driver
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * GPL v2, can be found in COPYING.
+ */
+
+ #include <linux/module.h>
+ #include <linux/pci.h>
+ #include <linux/interrupt.h>
+ #include <linux/dma-mapping.h>
+
+ #include <sound/core.h>
+
+ #include <asm/macio.h>
+ #include <asm/dbdma.h>
+
+ #include "../soundbus.h"
+ #include "i2sbus.h"
+
+ MODULE_LICENSE("GPL");
+ MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
+ MODULE_DESCRIPTION("Apple Soundbus: I2S support");
+
+ 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" },
+ { }
+ };
+
+ MODULE_DEVICE_TABLE(of, i2sbus_match);
+
+ static int alloc_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
+ struct dbdma_command_mem *r,
+ int numcmds)
+ {
+ /* one more for rounding, one for branch back, one for stop command */
+ r->size = (numcmds + 3) * 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 = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; 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 = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; 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 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;
+ }
+
+
+ /*
+ * XXX FIXME: We test the layout_id's here to get the proper way of
+ * mapping in various registers, thanks to bugs in Apple device-trees.
+ * We could instead key off the machine model and the name of the i2s
+ * node (i2s-a). This we'll do when we move it all to macio_asic.c
+ * and have that export items for each sub-node too.
+ */
+ static int i2sbus_get_and_fixup_rsrc(struct device_node *np, int index,
+ int layout, struct resource *res)
+ {
+ struct device_node *parent;
+ int pindex, rc = -ENXIO;
+ const u32 *reg;
+
+ /* Machines with layout 76 and 36 (K2 based) have a weird device
+ * tree what we need to special case.
+ * Normal machines just fetch the resource from the i2s-X node.
+ * Darwin further divides normal machines into old and new layouts
+ * with a subtely different code path but that doesn't seem necessary
+ * in practice, they just bloated it. In addition, even on our K2
+ * case the i2s-modem node, if we ever want to handle it, uses the
+ * normal layout
+ */
+ if (layout != 76 && layout != 36)
+ return of_address_to_resource(np, index, res);
+
+ parent = of_get_parent(np);
+ pindex = (index == aoa_resource_i2smmio) ? 0 : 1;
+ rc = of_address_to_resource(parent, pindex, res);
+ if (rc)
+ goto bail;
+ reg = of_get_property(np, "reg", NULL);
+ if (reg == NULL) {
+ rc = -ENXIO;
+ goto bail;
+ }
+ res->start += reg[index * 2];
+ res->end = res->start + reg[index * 2 + 1] - 1;
+ bail:
+ of_node_put(parent);
+ return rc;
+ }
+
+ /* 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;
+ struct resource *r;
- force = 1;
++ int i, layout = 0, rlen, ok = force;
+ static const char *rnames[] = { "i2sbus: %s (control)",
+ "i2sbus: %s (tx)",
+ "i2sbus: %s (rx)" };
+ static irq_handler_t ints[] = {
+ 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) {
+ const u32 *layout_id =
+ of_get_property(sound, "layout-id", NULL);
+ if (layout_id) {
+ layout = *layout_id;
+ snprintf(dev->sound.modalias, 32,
+ "sound-layout-%d", layout);
- if (!force) {
++ ok = 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 (!ok) {
+ 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 = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
+ dev->interrupts[i] = -1;
+ snprintf(dev->rnames[i], sizeof(dev->rnames[i]),
+ rnames[i], np->name);
+ }
+ for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; 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;
+ }
+
+
+ /* Resource handling is problematic as some device-trees contain
+ * useless crap (ugh ugh ugh). We work around that here by calling
+ * specific functions for calculating the appropriate resources.
+ *
+ * This will all be moved to macio_asic.c at one point
+ */
+ for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
+ if (i2sbus_get_and_fixup_rsrc(np,i,layout,&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;
+ }
+ }
+
+ r = &dev->resources[aoa_resource_i2smmio];
+ rlen = r->end - r->start + 1;
+ if (rlen < sizeof(struct i2s_interface_regs))
+ goto err;
+ dev->intfregs = ioremap(r->start, rlen);
+
+ r = &dev->resources[aoa_resource_txdbdma];
+ rlen = r->end - r->start + 1;
+ if (rlen < sizeof(struct dbdma_regs))
+ goto err;
+ dev->out.dbdma = ioremap(r->start, rlen);
+
+ r = &dev->resources[aoa_resource_rxdbdma];
+ rlen = r->end - r->start + 1;
+ if (rlen < sizeof(struct dbdma_regs))
+ goto err;
+ dev->in.dbdma = ioremap(r->start, rlen);
+
+ 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 (of_device_is_compatible(np, "i2sbus") ||
+ of_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);
+ }
+
+ /* 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;
+ }
+
+ /* wait until streams are stopped */
+ i2sbus_wait_for_stop_both(i2sdev);
+ }
+
+ 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) {
+ /* reset i2s bus format etc. */
+ i2sbus_pcm_prepare_both(i2sdev);
+
+ /* 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;
+ }
+ }
+
+ 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);
projects / cascardo / linux.git / commitdiff