466 lines
12 KiB
C
466 lines
12 KiB
C
/*
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* i2sbus driver
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*
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* Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net>
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*
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* GPL v2, can be found in COPYING.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/dma-mapping.h>
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#include <sound/core.h>
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#include <asm/macio.h>
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#include <asm/dbdma.h>
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#include "../soundbus.h"
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#include "i2sbus.h"
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
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MODULE_DESCRIPTION("Apple Soundbus: I2S support");
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static int force;
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module_param(force, int, 0444);
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MODULE_PARM_DESC(force, "Force loading i2sbus even when"
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" no layout-id property is present");
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static struct of_device_id i2sbus_match[] = {
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{ .name = "i2s" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, i2sbus_match);
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static int alloc_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
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struct dbdma_command_mem *r,
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int numcmds)
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{
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/* one more for rounding, one for branch back, one for stop command */
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r->size = (numcmds + 3) * sizeof(struct dbdma_cmd);
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/* We use the PCI APIs for now until the generic one gets fixed
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* enough or until we get some macio-specific versions
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*/
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r->space = dma_alloc_coherent(
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&macio_get_pci_dev(i2sdev->macio)->dev,
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r->size,
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&r->bus_addr,
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GFP_KERNEL);
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if (!r->space) return -ENOMEM;
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memset(r->space, 0, r->size);
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r->cmds = (void*)DBDMA_ALIGN(r->space);
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r->bus_cmd_start = r->bus_addr +
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(dma_addr_t)((char*)r->cmds - (char*)r->space);
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return 0;
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}
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static void free_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
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struct dbdma_command_mem *r)
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{
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if (!r->space) return;
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dma_free_coherent(&macio_get_pci_dev(i2sdev->macio)->dev,
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r->size, r->space, r->bus_addr);
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}
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static void i2sbus_release_dev(struct device *dev)
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{
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struct i2sbus_dev *i2sdev;
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int i;
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i2sdev = container_of(dev, struct i2sbus_dev, sound.ofdev.dev);
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if (i2sdev->intfregs) iounmap(i2sdev->intfregs);
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if (i2sdev->out.dbdma) iounmap(i2sdev->out.dbdma);
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if (i2sdev->in.dbdma) iounmap(i2sdev->in.dbdma);
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for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++)
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if (i2sdev->allocated_resource[i])
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release_and_free_resource(i2sdev->allocated_resource[i]);
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free_dbdma_descriptor_ring(i2sdev, &i2sdev->out.dbdma_ring);
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free_dbdma_descriptor_ring(i2sdev, &i2sdev->in.dbdma_ring);
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for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++)
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free_irq(i2sdev->interrupts[i], i2sdev);
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i2sbus_control_remove_dev(i2sdev->control, i2sdev);
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mutex_destroy(&i2sdev->lock);
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kfree(i2sdev);
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}
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static irqreturn_t i2sbus_bus_intr(int irq, void *devid)
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{
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struct i2sbus_dev *dev = devid;
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u32 intreg;
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spin_lock(&dev->low_lock);
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intreg = in_le32(&dev->intfregs->intr_ctl);
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/* acknowledge interrupt reasons */
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out_le32(&dev->intfregs->intr_ctl, intreg);
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spin_unlock(&dev->low_lock);
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return IRQ_HANDLED;
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}
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/*
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* XXX FIXME: We test the layout_id's here to get the proper way of
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* mapping in various registers, thanks to bugs in Apple device-trees.
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* We could instead key off the machine model and the name of the i2s
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* node (i2s-a). This we'll do when we move it all to macio_asic.c
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* and have that export items for each sub-node too.
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*/
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static int i2sbus_get_and_fixup_rsrc(struct device_node *np, int index,
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int layout, struct resource *res)
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{
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struct device_node *parent;
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int pindex, rc = -ENXIO;
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const u32 *reg;
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/* Machines with layout 76 and 36 (K2 based) have a weird device
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* tree what we need to special case.
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* Normal machines just fetch the resource from the i2s-X node.
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* Darwin further divides normal machines into old and new layouts
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* with a subtely different code path but that doesn't seem necessary
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* in practice, they just bloated it. In addition, even on our K2
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* case the i2s-modem node, if we ever want to handle it, uses the
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* normal layout
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*/
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if (layout != 76 && layout != 36)
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return of_address_to_resource(np, index, res);
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parent = of_get_parent(np);
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pindex = (index == aoa_resource_i2smmio) ? 0 : 1;
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rc = of_address_to_resource(parent, pindex, res);
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if (rc)
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goto bail;
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reg = of_get_property(np, "reg", NULL);
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if (reg == NULL) {
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rc = -ENXIO;
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goto bail;
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}
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res->start += reg[index * 2];
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res->end = res->start + reg[index * 2 + 1] - 1;
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bail:
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of_node_put(parent);
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return rc;
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}
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/* FIXME: look at device node refcounting */
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static int i2sbus_add_dev(struct macio_dev *macio,
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struct i2sbus_control *control,
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struct device_node *np)
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{
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struct i2sbus_dev *dev;
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struct device_node *child = NULL, *sound = NULL;
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struct resource *r;
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int i, layout = 0, rlen, ok = force;
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static const char *rnames[] = { "i2sbus: %s (control)",
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"i2sbus: %s (tx)",
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"i2sbus: %s (rx)" };
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static irq_handler_t ints[] = {
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i2sbus_bus_intr,
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i2sbus_tx_intr,
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i2sbus_rx_intr
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};
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if (strlen(np->name) != 5)
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return 0;
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if (strncmp(np->name, "i2s-", 4))
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return 0;
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dev = kzalloc(sizeof(struct i2sbus_dev), GFP_KERNEL);
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if (!dev)
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return 0;
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i = 0;
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while ((child = of_get_next_child(np, child))) {
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if (strcmp(child->name, "sound") == 0) {
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i++;
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sound = child;
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}
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}
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if (i == 1) {
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const u32 *id = of_get_property(sound, "layout-id", NULL);
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if (id) {
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layout = *id;
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snprintf(dev->sound.modalias, 32,
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"sound-layout-%d", layout);
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ok = 1;
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} else {
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id = of_get_property(sound, "device-id", NULL);
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/*
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* We probably cannot handle all device-id machines,
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* so restrict to those we do handle for now.
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*/
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if (id && (*id == 22 || *id == 14 || *id == 35 ||
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*id == 44)) {
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snprintf(dev->sound.modalias, 32,
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"aoa-device-id-%d", *id);
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ok = 1;
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layout = -1;
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}
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}
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}
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/* for the time being, until we can handle non-layout-id
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* things in some fabric, refuse to attach if there is no
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* layout-id property or we haven't been forced to attach.
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* When there are two i2s busses and only one has a layout-id,
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* then this depends on the order, but that isn't important
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* either as the second one in that case is just a modem. */
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if (!ok) {
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kfree(dev);
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return -ENODEV;
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}
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mutex_init(&dev->lock);
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spin_lock_init(&dev->low_lock);
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dev->sound.ofdev.archdata.dma_mask = macio->ofdev.archdata.dma_mask;
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dev->sound.ofdev.dev.of_node = np;
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dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.archdata.dma_mask;
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dev->sound.ofdev.dev.parent = &macio->ofdev.dev;
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dev->sound.ofdev.dev.release = i2sbus_release_dev;
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dev->sound.attach_codec = i2sbus_attach_codec;
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dev->sound.detach_codec = i2sbus_detach_codec;
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dev->sound.pcmid = -1;
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dev->macio = macio;
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dev->control = control;
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dev->bus_number = np->name[4] - 'a';
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INIT_LIST_HEAD(&dev->sound.codec_list);
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for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
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dev->interrupts[i] = -1;
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snprintf(dev->rnames[i], sizeof(dev->rnames[i]),
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rnames[i], np->name);
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}
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for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
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int irq = irq_of_parse_and_map(np, i);
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if (request_irq(irq, ints[i], 0, dev->rnames[i], dev))
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goto err;
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dev->interrupts[i] = irq;
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}
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/* Resource handling is problematic as some device-trees contain
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* useless crap (ugh ugh ugh). We work around that here by calling
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* specific functions for calculating the appropriate resources.
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*
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* This will all be moved to macio_asic.c at one point
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*/
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for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
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if (i2sbus_get_and_fixup_rsrc(np,i,layout,&dev->resources[i]))
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goto err;
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/* If only we could use our resource dev->resources[i]...
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* but request_resource doesn't know about parents and
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* contained resources...
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*/
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dev->allocated_resource[i] =
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request_mem_region(dev->resources[i].start,
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resource_size(&dev->resources[i]),
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dev->rnames[i]);
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if (!dev->allocated_resource[i]) {
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printk(KERN_ERR "i2sbus: failed to claim resource %d!\n", i);
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goto err;
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}
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}
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r = &dev->resources[aoa_resource_i2smmio];
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rlen = resource_size(r);
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if (rlen < sizeof(struct i2s_interface_regs))
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goto err;
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dev->intfregs = ioremap(r->start, rlen);
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r = &dev->resources[aoa_resource_txdbdma];
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rlen = resource_size(r);
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if (rlen < sizeof(struct dbdma_regs))
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goto err;
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dev->out.dbdma = ioremap(r->start, rlen);
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r = &dev->resources[aoa_resource_rxdbdma];
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rlen = resource_size(r);
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if (rlen < sizeof(struct dbdma_regs))
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goto err;
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dev->in.dbdma = ioremap(r->start, rlen);
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if (!dev->intfregs || !dev->out.dbdma || !dev->in.dbdma)
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goto err;
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if (alloc_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring,
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MAX_DBDMA_COMMANDS))
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goto err;
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if (alloc_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring,
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MAX_DBDMA_COMMANDS))
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goto err;
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if (i2sbus_control_add_dev(dev->control, dev)) {
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printk(KERN_ERR "i2sbus: control layer didn't like bus\n");
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goto err;
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}
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if (soundbus_add_one(&dev->sound)) {
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printk(KERN_DEBUG "i2sbus: device registration error!\n");
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goto err;
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}
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/* enable this cell */
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i2sbus_control_cell(dev->control, dev, 1);
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i2sbus_control_enable(dev->control, dev);
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i2sbus_control_clock(dev->control, dev, 1);
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return 1;
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err:
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for (i=0;i<3;i++)
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if (dev->interrupts[i] != -1)
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free_irq(dev->interrupts[i], dev);
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free_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring);
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free_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring);
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if (dev->intfregs) iounmap(dev->intfregs);
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if (dev->out.dbdma) iounmap(dev->out.dbdma);
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if (dev->in.dbdma) iounmap(dev->in.dbdma);
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for (i=0;i<3;i++)
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if (dev->allocated_resource[i])
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release_and_free_resource(dev->allocated_resource[i]);
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mutex_destroy(&dev->lock);
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kfree(dev);
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return 0;
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}
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static int i2sbus_probe(struct macio_dev* dev, const struct of_device_id *match)
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{
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struct device_node *np = NULL;
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int got = 0, err;
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struct i2sbus_control *control = NULL;
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err = i2sbus_control_init(dev, &control);
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if (err)
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return err;
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if (!control) {
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printk(KERN_ERR "i2sbus_control_init API breakage\n");
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return -ENODEV;
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}
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while ((np = of_get_next_child(dev->ofdev.dev.of_node, np))) {
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if (of_device_is_compatible(np, "i2sbus") ||
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of_device_is_compatible(np, "i2s-modem")) {
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got += i2sbus_add_dev(dev, control, np);
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}
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}
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if (!got) {
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/* found none, clean up */
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i2sbus_control_destroy(control);
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return -ENODEV;
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}
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dev_set_drvdata(&dev->ofdev.dev, control);
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return 0;
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}
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static int i2sbus_remove(struct macio_dev* dev)
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{
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struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
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struct i2sbus_dev *i2sdev, *tmp;
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list_for_each_entry_safe(i2sdev, tmp, &control->list, item)
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soundbus_remove_one(&i2sdev->sound);
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return 0;
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}
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#ifdef CONFIG_PM
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static int i2sbus_suspend(struct macio_dev* dev, pm_message_t state)
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{
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struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
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struct codec_info_item *cii;
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struct i2sbus_dev* i2sdev;
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int err, ret = 0;
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list_for_each_entry(i2sdev, &control->list, item) {
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/* Notify Alsa */
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if (i2sdev->sound.pcm) {
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/* Suspend PCM streams */
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snd_pcm_suspend_all(i2sdev->sound.pcm);
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}
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/* Notify codecs */
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list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
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err = 0;
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if (cii->codec->suspend)
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err = cii->codec->suspend(cii, state);
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if (err)
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ret = err;
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}
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/* wait until streams are stopped */
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i2sbus_wait_for_stop_both(i2sdev);
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}
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return ret;
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}
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static int i2sbus_resume(struct macio_dev* dev)
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{
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struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
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struct codec_info_item *cii;
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struct i2sbus_dev* i2sdev;
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int err, ret = 0;
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list_for_each_entry(i2sdev, &control->list, item) {
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/* reset i2s bus format etc. */
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i2sbus_pcm_prepare_both(i2sdev);
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/* Notify codecs so they can re-initialize */
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list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
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err = 0;
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if (cii->codec->resume)
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err = cii->codec->resume(cii);
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if (err)
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ret = err;
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}
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}
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return ret;
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}
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#endif /* CONFIG_PM */
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static int i2sbus_shutdown(struct macio_dev* dev)
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{
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return 0;
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}
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static struct macio_driver i2sbus_drv = {
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.driver = {
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.name = "soundbus-i2s",
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.owner = THIS_MODULE,
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.of_match_table = i2sbus_match,
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},
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.probe = i2sbus_probe,
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.remove = i2sbus_remove,
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#ifdef CONFIG_PM
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.suspend = i2sbus_suspend,
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.resume = i2sbus_resume,
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#endif
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.shutdown = i2sbus_shutdown,
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};
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static int __init soundbus_i2sbus_init(void)
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{
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return macio_register_driver(&i2sbus_drv);
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}
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static void __exit soundbus_i2sbus_exit(void)
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{
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macio_unregister_driver(&i2sbus_drv);
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}
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module_init(soundbus_i2sbus_init);
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module_exit(soundbus_i2sbus_exit);
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