1 files changed, 387 insertions, 0 deletions

diff --git a/sound/aoa/soundbus/i2sbus/i2sbus-core.c b/sound/aoa/soundbus/i2sbus/i2sbus-core.c
new file mode 100644
index 00000000000..f268dacdaa0
--- /dev/null
+++ b/sound/aoa/soundbus/i2sbus/i2sbus-core.c
@@ -0,0 +1,387 @@
+/*
+ * 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 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;
+}
+
+static int force;
+module_param(force, int, 0444);
+MODULE_PARM_DESC(force, "Force loading i2sbus even when"
+                        " no layout-id property is present");
+
+/* 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;
+
+        if (np->n_intrs != 3)
+                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++) {
+                if (request_irq(np->intrs[i].line, ints[i], 0, dev->rnames[i], dev))
+                        goto err;
+                dev->interrupts[i] = np->intrs[i].line;
+        }
+
+        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);