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454 lines
12 KiB
454 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* i2sbus driver |
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* |
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* Copyright 2006-2008 Johannes Berg <[email protected]> |
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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 <linux/of_address.h> |
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#include <linux/of_irq.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 <[email protected]>"); |
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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 const 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(&macio_get_pci_dev(i2sdev->macio)->dev, |
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r->size, &r->bus_addr, GFP_KERNEL); |
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if (!r->space) |
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return -ENOMEM; |
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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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iounmap(i2sdev->intfregs); |
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iounmap(i2sdev->out.dbdma); |
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iounmap(i2sdev->in.dbdma); |
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for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; 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, *sound = NULL; |
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struct resource *r; |
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int i, layout = 0, rlen, ok = force; |
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char node_name[6]; |
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static const char *rnames[] = { "i2sbus: %pOFn (control)", |
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"i2sbus: %pOFn (tx)", |
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"i2sbus: %pOFn (rx)" }; |
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static const 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 (snprintf(node_name, sizeof(node_name), "%pOFn", np) != 5) |
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return 0; |
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if (strncmp(node_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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for_each_child_of_node(np, child) { |
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if (of_node_name_eq(child, "sound")) { |
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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 == 31 || *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 = node_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); |
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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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iounmap(dev->intfregs); |
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iounmap(dev->out.dbdma); |
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iounmap(dev->in.dbdma); |
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for (i=0;i<3;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 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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