diff options
Diffstat (limited to 'sound/aoa/soundbus/i2sbus')
| -rw-r--r-- | sound/aoa/soundbus/i2sbus/Makefile | 3 | ||||
| -rw-r--r-- | sound/aoa/soundbus/i2sbus/control.c | 193 | ||||
| -rw-r--r-- | sound/aoa/soundbus/i2sbus/core.c | 459 | ||||
| -rw-r--r-- | sound/aoa/soundbus/i2sbus/i2sbus.h | 125 | ||||
| -rw-r--r-- | sound/aoa/soundbus/i2sbus/interface.h | 186 | ||||
| -rw-r--r-- | sound/aoa/soundbus/i2sbus/pcm.c | 1052 |
6 files changed, 2018 insertions, 0 deletions
diff --git a/sound/aoa/soundbus/i2sbus/Makefile b/sound/aoa/soundbus/i2sbus/Makefile new file mode 100644 index 0000000000..1b38c87fef --- /dev/null +++ b/sound/aoa/soundbus/i2sbus/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_SND_AOA_SOUNDBUS_I2S) += snd-aoa-i2sbus.o +snd-aoa-i2sbus-objs := core.o pcm.o control.o diff --git a/sound/aoa/soundbus/i2sbus/control.c b/sound/aoa/soundbus/i2sbus/control.c new file mode 100644 index 0000000000..7d3abb8b24 --- /dev/null +++ b/sound/aoa/soundbus/i2sbus/control.c @@ -0,0 +1,193 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * i2sbus driver -- bus control routines + * + * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> + */ + +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/io.h> + +#include <asm/prom.h> +#include <asm/macio.h> +#include <asm/pmac_feature.h> +#include <asm/pmac_pfunc.h> +#include <asm/keylargo.h> + +#include "i2sbus.h" + +int i2sbus_control_init(struct macio_dev* dev, struct i2sbus_control **c) +{ + *c = kzalloc(sizeof(struct i2sbus_control), GFP_KERNEL); + if (!*c) + return -ENOMEM; + + INIT_LIST_HEAD(&(*c)->list); + + (*c)->macio = dev->bus->chip; + return 0; +} + +void i2sbus_control_destroy(struct i2sbus_control *c) +{ + kfree(c); +} + +/* this is serialised externally */ +int i2sbus_control_add_dev(struct i2sbus_control *c, + struct i2sbus_dev *i2sdev) +{ + struct device_node *np; + + np = i2sdev->sound.ofdev.dev.of_node; + i2sdev->enable = pmf_find_function(np, "enable"); + i2sdev->cell_enable = pmf_find_function(np, "cell-enable"); + i2sdev->clock_enable = pmf_find_function(np, "clock-enable"); + i2sdev->cell_disable = pmf_find_function(np, "cell-disable"); + i2sdev->clock_disable = pmf_find_function(np, "clock-disable"); + + /* if the bus number is not 0 or 1 we absolutely need to use + * the platform functions -- there's nothing in Darwin that + * would allow seeing a system behind what the FCRs are then, + * and I don't want to go parsing a bunch of platform functions + * by hand to try finding a system... */ + if (i2sdev->bus_number != 0 && i2sdev->bus_number != 1 && + (!i2sdev->enable || + !i2sdev->cell_enable || !i2sdev->clock_enable || + !i2sdev->cell_disable || !i2sdev->clock_disable)) { + pmf_put_function(i2sdev->enable); + pmf_put_function(i2sdev->cell_enable); + pmf_put_function(i2sdev->clock_enable); + pmf_put_function(i2sdev->cell_disable); + pmf_put_function(i2sdev->clock_disable); + return -ENODEV; + } + + list_add(&i2sdev->item, &c->list); + + return 0; +} + +void i2sbus_control_remove_dev(struct i2sbus_control *c, + struct i2sbus_dev *i2sdev) +{ + /* this is serialised externally */ + list_del(&i2sdev->item); + if (list_empty(&c->list)) + i2sbus_control_destroy(c); +} + +int i2sbus_control_enable(struct i2sbus_control *c, + struct i2sbus_dev *i2sdev) +{ + struct pmf_args args = { .count = 0 }; + struct macio_chip *macio = c->macio; + + if (i2sdev->enable) + return pmf_call_one(i2sdev->enable, &args); + + if (macio == NULL || macio->base == NULL) + return -ENODEV; + + switch (i2sdev->bus_number) { + case 0: + /* these need to be locked or done through + * newly created feature calls! */ + MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE); + break; + case 1: + MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_ENABLE); + break; + default: + return -ENODEV; + } + return 0; +} + +int i2sbus_control_cell(struct i2sbus_control *c, + struct i2sbus_dev *i2sdev, + int enable) +{ + struct pmf_args args = { .count = 0 }; + struct macio_chip *macio = c->macio; + + switch (enable) { + case 0: + if (i2sdev->cell_disable) + return pmf_call_one(i2sdev->cell_disable, &args); + break; + case 1: + if (i2sdev->cell_enable) + return pmf_call_one(i2sdev->cell_enable, &args); + break; + default: + printk(KERN_ERR "i2sbus: INVALID CELL ENABLE VALUE\n"); + return -ENODEV; + } + + if (macio == NULL || macio->base == NULL) + return -ENODEV; + + switch (i2sdev->bus_number) { + case 0: + if (enable) + MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE); + else + MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE); + break; + case 1: + if (enable) + MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_CELL_ENABLE); + else + MACIO_BIC(KEYLARGO_FCR1, KL1_I2S1_CELL_ENABLE); + break; + default: + return -ENODEV; + } + return 0; +} + +int i2sbus_control_clock(struct i2sbus_control *c, + struct i2sbus_dev *i2sdev, + int enable) +{ + struct pmf_args args = { .count = 0 }; + struct macio_chip *macio = c->macio; + + switch (enable) { + case 0: + if (i2sdev->clock_disable) + return pmf_call_one(i2sdev->clock_disable, &args); + break; + case 1: + if (i2sdev->clock_enable) + return pmf_call_one(i2sdev->clock_enable, &args); + break; + default: + printk(KERN_ERR "i2sbus: INVALID CLOCK ENABLE VALUE\n"); + return -ENODEV; + } + + if (macio == NULL || macio->base == NULL) + return -ENODEV; + + switch (i2sdev->bus_number) { + case 0: + if (enable) + MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT); + else + MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT); + break; + case 1: + if (enable) + MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_CLK_ENABLE_BIT); + else + MACIO_BIC(KEYLARGO_FCR1, KL1_I2S1_CLK_ENABLE_BIT); + break; + default: + return -ENODEV; + } + return 0; +} diff --git a/sound/aoa/soundbus/i2sbus/core.c b/sound/aoa/soundbus/i2sbus/core.c new file mode 100644 index 0000000000..51ed2f34b2 --- /dev/null +++ b/sound/aoa/soundbus/i2sbus/core.c @@ -0,0 +1,459 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * i2sbus driver + * + * Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net> + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/dma-mapping.h> +#include <linux/of_address.h> +#include <linux/of_irq.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 const 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; + + 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); + iounmap(i2sdev->intfregs); + iounmap(i2sdev->out.dbdma); + iounmap(i2sdev->in.dbdma); + for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; 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; +} + +/* Returns 1 if added, 0 for otherwise; don't return a negative value! */ +/* 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, *sound = NULL; + struct resource *r; + int i, layout = 0, rlen, ok = force; + char node_name[6]; + static const char *rnames[] = { "i2sbus: %pOFn (control)", + "i2sbus: %pOFn (tx)", + "i2sbus: %pOFn (rx)" }; + static const irq_handler_t ints[] = { + i2sbus_bus_intr, + i2sbus_tx_intr, + i2sbus_rx_intr + }; + + if (snprintf(node_name, sizeof(node_name), "%pOFn", np) != 5) + return 0; + if (strncmp(node_name, "i2s-", 4)) + return 0; + + dev = kzalloc(sizeof(struct i2sbus_dev), GFP_KERNEL); + if (!dev) + return 0; + + i = 0; + for_each_child_of_node(np, child) { + if (of_node_name_eq(child, "sound")) { + i++; + sound = child; + } + } + if (i == 1) { + const u32 *id = of_get_property(sound, "layout-id", NULL); + + if (id) { + layout = *id; + snprintf(dev->sound.modalias, 32, + "sound-layout-%d", layout); + ok = 1; + } else { + id = of_get_property(sound, "device-id", NULL); + /* + * We probably cannot handle all device-id machines, + * so restrict to those we do handle for now. + */ + if (id && (*id == 22 || *id == 14 || *id == 35 || + *id == 31 || *id == 44)) { + snprintf(dev->sound.modalias, 32, + "aoa-device-id-%d", *id); + ok = 1; + layout = -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 0; + } + + mutex_init(&dev->lock); + spin_lock_init(&dev->low_lock); + dev->sound.ofdev.archdata.dma_mask = macio->ofdev.archdata.dma_mask; + dev->sound.ofdev.dev.of_node = np; + dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.archdata.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 = node_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); + } + 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, + resource_size(&dev->resources[i]), + 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 = resource_size(r); + if (rlen < sizeof(struct i2s_interface_regs)) + goto err; + dev->intfregs = ioremap(r->start, rlen); + + r = &dev->resources[aoa_resource_txdbdma]; + rlen = resource_size(r); + if (rlen < sizeof(struct dbdma_regs)) + goto err; + dev->out.dbdma = ioremap(r->start, rlen); + + r = &dev->resources[aoa_resource_rxdbdma]; + rlen = resource_size(r); + 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"); + if (dev->sound.ofdev.dev.kobj.state_initialized) { + soundbus_dev_put(&dev->sound); + return 0; + } + 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); + iounmap(dev->intfregs); + iounmap(dev->out.dbdma); + iounmap(dev->in.dbdma); + for (i=0;i<3;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.dev.of_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_set_drvdata(&dev->ofdev.dev, control); + + return 0; +} + +static int i2sbus_remove(struct macio_dev* dev) +{ + struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev); + 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_get_drvdata(&dev->ofdev.dev); + struct codec_info_item *cii; + struct i2sbus_dev* i2sdev; + int err, ret = 0; + + list_for_each_entry(i2sdev, &control->list, item) { + /* 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_get_drvdata(&dev->ofdev.dev); + 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 = { + .driver = { + .name = "soundbus-i2s", + .owner = THIS_MODULE, + .of_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); diff --git a/sound/aoa/soundbus/i2sbus/i2sbus.h b/sound/aoa/soundbus/i2sbus/i2sbus.h new file mode 100644 index 0000000000..e86fdbb3b4 --- /dev/null +++ b/sound/aoa/soundbus/i2sbus/i2sbus.h @@ -0,0 +1,125 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * i2sbus driver -- private definitions + * + * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> + */ +#ifndef __I2SBUS_H +#define __I2SBUS_H +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/mutex.h> +#include <linux/completion.h> + +#include <sound/pcm.h> + +#include <asm/prom.h> +#include <asm/pmac_feature.h> +#include <asm/dbdma.h> + +#include "interface.h" +#include "../soundbus.h" + +struct i2sbus_control { + struct list_head list; + struct macio_chip *macio; +}; + +#define MAX_DBDMA_COMMANDS 32 + +struct dbdma_command_mem { + dma_addr_t bus_addr; + dma_addr_t bus_cmd_start; + struct dbdma_cmd *cmds; + void *space; + int size; + u32 running:1; + u32 stopping:1; +}; + +struct pcm_info { + u32 created:1, /* has this direction been created with alsa? */ + active:1; /* is this stream active? */ + /* runtime information */ + struct snd_pcm_substream *substream; + int current_period; + u32 frame_count; + struct dbdma_command_mem dbdma_ring; + volatile struct dbdma_regs __iomem *dbdma; + struct completion *stop_completion; +}; + +enum { + aoa_resource_i2smmio = 0, + aoa_resource_txdbdma, + aoa_resource_rxdbdma, +}; + +struct i2sbus_dev { + struct soundbus_dev sound; + struct macio_dev *macio; + struct i2sbus_control *control; + volatile struct i2s_interface_regs __iomem *intfregs; + + struct resource resources[3]; + struct resource *allocated_resource[3]; + int interrupts[3]; + char rnames[3][32]; + + /* info about currently active substreams */ + struct pcm_info out, in; + snd_pcm_format_t format; + unsigned int rate; + + /* list for a single controller */ + struct list_head item; + /* number of bus on controller */ + int bus_number; + /* for use by control layer */ + struct pmf_function *enable, + *cell_enable, + *cell_disable, + *clock_enable, + *clock_disable; + + /* locks */ + /* spinlock for low-level interrupt locking */ + spinlock_t low_lock; + /* mutex for high-level consistency */ + struct mutex lock; +}; + +#define soundbus_dev_to_i2sbus_dev(sdev) \ + container_of(sdev, struct i2sbus_dev, sound) + +/* pcm specific functions */ +extern int +i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card, + struct codec_info *ci, void *data); +extern void +i2sbus_detach_codec(struct soundbus_dev *dev, void *data); +extern irqreturn_t +i2sbus_tx_intr(int irq, void *devid); +extern irqreturn_t +i2sbus_rx_intr(int irq, void *devid); + +extern void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev); +extern void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev); + +/* control specific functions */ +extern int i2sbus_control_init(struct macio_dev* dev, + struct i2sbus_control **c); +extern void i2sbus_control_destroy(struct i2sbus_control *c); +extern int i2sbus_control_add_dev(struct i2sbus_control *c, + struct i2sbus_dev *i2sdev); +extern void i2sbus_control_remove_dev(struct i2sbus_control *c, + struct i2sbus_dev *i2sdev); +extern int i2sbus_control_enable(struct i2sbus_control *c, + struct i2sbus_dev *i2sdev); +extern int i2sbus_control_cell(struct i2sbus_control *c, + struct i2sbus_dev *i2sdev, + int enable); +extern int i2sbus_control_clock(struct i2sbus_control *c, + struct i2sbus_dev *i2sdev, + int enable); +#endif /* __I2SBUS_H */ diff --git a/sound/aoa/soundbus/i2sbus/interface.h b/sound/aoa/soundbus/i2sbus/interface.h new file mode 100644 index 0000000000..16fa88822d --- /dev/null +++ b/sound/aoa/soundbus/i2sbus/interface.h @@ -0,0 +1,186 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * i2sbus driver -- interface register definitions + * + * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> + */ +#ifndef __I2SBUS_INTERFACE_H +#define __I2SBUS_INTERFACE_H + +/* i2s bus control registers, at least what we know about them */ + +#define __PAD(m,n) u8 __pad##m[n] +#define _PAD(line, n) __PAD(line, n) +#define PAD(n) _PAD(__LINE__, (n)) +struct i2s_interface_regs { + __le32 intr_ctl; /* 0x00 */ + PAD(12); + __le32 serial_format; /* 0x10 */ + PAD(12); + __le32 codec_msg_out; /* 0x20 */ + PAD(12); + __le32 codec_msg_in; /* 0x30 */ + PAD(12); + __le32 frame_count; /* 0x40 */ + PAD(12); + __le32 frame_match; /* 0x50 */ + PAD(12); + __le32 data_word_sizes; /* 0x60 */ + PAD(12); + __le32 peak_level_sel; /* 0x70 */ + PAD(12); + __le32 peak_level_in0; /* 0x80 */ + PAD(12); + __le32 peak_level_in1; /* 0x90 */ + PAD(12); + /* total size: 0x100 bytes */ +} __attribute__((__packed__)); + +/* interrupt register is just a bitfield with + * interrupt enable and pending bits */ +#define I2S_REG_INTR_CTL 0x00 +# define I2S_INT_FRAME_COUNT (1<<31) +# define I2S_PENDING_FRAME_COUNT (1<<30) +# define I2S_INT_MESSAGE_FLAG (1<<29) +# define I2S_PENDING_MESSAGE_FLAG (1<<28) +# define I2S_INT_NEW_PEAK (1<<27) +# define I2S_PENDING_NEW_PEAK (1<<26) +# define I2S_INT_CLOCKS_STOPPED (1<<25) +# define I2S_PENDING_CLOCKS_STOPPED (1<<24) +# define I2S_INT_EXTERNAL_SYNC_ERROR (1<<23) +# define I2S_PENDING_EXTERNAL_SYNC_ERROR (1<<22) +# define I2S_INT_EXTERNAL_SYNC_OK (1<<21) +# define I2S_PENDING_EXTERNAL_SYNC_OK (1<<20) +# define I2S_INT_NEW_SAMPLE_RATE (1<<19) +# define I2S_PENDING_NEW_SAMPLE_RATE (1<<18) +# define I2S_INT_STATUS_FLAG (1<<17) +# define I2S_PENDING_STATUS_FLAG (1<<16) + +/* serial format register is more interesting :) + * It contains: + * - clock source + * - MClk divisor + * - SClk divisor + * - SClk master flag + * - serial format (sony, i2s 64x, i2s 32x, dav, silabs) + * - external sample frequency interrupt (don't understand) + * - external sample frequency + */ +#define I2S_REG_SERIAL_FORMAT 0x10 +/* clock source. You get either 18.432, 45.1584 or 49.1520 MHz */ +# define I2S_SF_CLOCK_SOURCE_SHIFT 30 +# define I2S_SF_CLOCK_SOURCE_MASK (3<<I2S_SF_CLOCK_SOURCE_SHIFT) +# define I2S_SF_CLOCK_SOURCE_18MHz (0<<I2S_SF_CLOCK_SOURCE_SHIFT) +# define I2S_SF_CLOCK_SOURCE_45MHz (1<<I2S_SF_CLOCK_SOURCE_SHIFT) +# define I2S_SF_CLOCK_SOURCE_49MHz (2<<I2S_SF_CLOCK_SOURCE_SHIFT) +/* also, let's define the exact clock speeds here, in Hz */ +#define I2S_CLOCK_SPEED_18MHz 18432000 +#define I2S_CLOCK_SPEED_45MHz 45158400 +#define I2S_CLOCK_SPEED_49MHz 49152000 +/* MClk is the clock that drives the codec, usually called its 'system clock'. + * It is derived by taking only every 'divisor' tick of the clock. + */ +# define I2S_SF_MCLKDIV_SHIFT 24 +# define I2S_SF_MCLKDIV_MASK (0x1F<<I2S_SF_MCLKDIV_SHIFT) +# define I2S_SF_MCLKDIV_1 (0x14<<I2S_SF_MCLKDIV_SHIFT) +# define I2S_SF_MCLKDIV_3 (0x13<<I2S_SF_MCLKDIV_SHIFT) +# define I2S_SF_MCLKDIV_5 (0x12<<I2S_SF_MCLKDIV_SHIFT) +# define I2S_SF_MCLKDIV_14 (0x0E<<I2S_SF_MCLKDIV_SHIFT) +# define I2S_SF_MCLKDIV_OTHER(div) (((div/2-1)<<I2S_SF_MCLKDIV_SHIFT)&I2S_SF_MCLKDIV_MASK) +static inline int i2s_sf_mclkdiv(int div, int *out) +{ + int d; + + switch(div) { + case 1: *out |= I2S_SF_MCLKDIV_1; return 0; + case 3: *out |= I2S_SF_MCLKDIV_3; return 0; + case 5: *out |= I2S_SF_MCLKDIV_5; return 0; + case 14: *out |= I2S_SF_MCLKDIV_14; return 0; + default: + if (div%2) return -1; + d = div/2-1; + if (d == 0x14 || d == 0x13 || d == 0x12 || d == 0x0E) + return -1; + *out |= I2S_SF_MCLKDIV_OTHER(div); + return 0; + } +} +/* SClk is the clock that drives the i2s wire bus. Note that it is + * derived from the MClk above by taking only every 'divisor' tick + * of MClk. + */ +# define I2S_SF_SCLKDIV_SHIFT 20 +# define I2S_SF_SCLKDIV_MASK (0xF<<I2S_SF_SCLKDIV_SHIFT) +# define I2S_SF_SCLKDIV_1 (8<<I2S_SF_SCLKDIV_SHIFT) +# define I2S_SF_SCLKDIV_3 (9<<I2S_SF_SCLKDIV_SHIFT) +# define I2S_SF_SCLKDIV_OTHER(div) (((div/2-1)<<I2S_SF_SCLKDIV_SHIFT)&I2S_SF_SCLKDIV_MASK) +static inline int i2s_sf_sclkdiv(int div, int *out) +{ + int d; + + switch(div) { + case 1: *out |= I2S_SF_SCLKDIV_1; return 0; + case 3: *out |= I2S_SF_SCLKDIV_3; return 0; + default: + if (div%2) return -1; + d = div/2-1; + if (d == 8 || d == 9) return -1; + *out |= I2S_SF_SCLKDIV_OTHER(div); + return 0; + } +} +# define I2S_SF_SCLK_MASTER (1<<19) +/* serial format is the way the data is put to the i2s wire bus */ +# define I2S_SF_SERIAL_FORMAT_SHIFT 16 +# define I2S_SF_SERIAL_FORMAT_MASK (7<<I2S_SF_SERIAL_FORMAT_SHIFT) +# define I2S_SF_SERIAL_FORMAT_SONY (0<<I2S_SF_SERIAL_FORMAT_SHIFT) +# define I2S_SF_SERIAL_FORMAT_I2S_64X (1<<I2S_SF_SERIAL_FORMAT_SHIFT) +# define I2S_SF_SERIAL_FORMAT_I2S_32X (2<<I2S_SF_SERIAL_FORMAT_SHIFT) +# define I2S_SF_SERIAL_FORMAT_I2S_DAV (4<<I2S_SF_SERIAL_FORMAT_SHIFT) +# define I2S_SF_SERIAL_FORMAT_I2S_SILABS (5<<I2S_SF_SERIAL_FORMAT_SHIFT) +/* unknown */ +# define I2S_SF_EXT_SAMPLE_FREQ_INT_SHIFT 12 +# define I2S_SF_EXT_SAMPLE_FREQ_INT_MASK (0xF<<I2S_SF_SAMPLE_FREQ_INT_SHIFT) +/* probably gives external frequency? */ +# define I2S_SF_EXT_SAMPLE_FREQ_MASK 0xFFF + +/* used to send codec messages, but how isn't clear */ +#define I2S_REG_CODEC_MSG_OUT 0x20 + +/* used to receive codec messages, but how isn't clear */ +#define I2S_REG_CODEC_MSG_IN 0x30 + +/* frame count reg isn't clear to me yet, but probably useful */ +#define I2S_REG_FRAME_COUNT 0x40 + +/* program to some value, and get interrupt if frame count reaches it */ +#define I2S_REG_FRAME_MATCH 0x50 + +/* this register describes how the bus transfers data */ +#define I2S_REG_DATA_WORD_SIZES 0x60 +/* number of interleaved input channels */ +# define I2S_DWS_NUM_CHANNELS_IN_SHIFT 24 +# define I2S_DWS_NUM_CHANNELS_IN_MASK (0x1F<<I2S_DWS_NUM_CHANNELS_IN_SHIFT) +/* word size of input data */ +# define I2S_DWS_DATA_IN_SIZE_SHIFT 16 +# define I2S_DWS_DATA_IN_16BIT (0<<I2S_DWS_DATA_IN_SIZE_SHIFT) +# define I2S_DWS_DATA_IN_24BIT (3<<I2S_DWS_DATA_IN_SIZE_SHIFT) +/* number of interleaved output channels */ +# define I2S_DWS_NUM_CHANNELS_OUT_SHIFT 8 +# define I2S_DWS_NUM_CHANNELS_OUT_MASK (0x1F<<I2S_DWS_NUM_CHANNELS_OUT_SHIFT) +/* word size of output data */ +# define I2S_DWS_DATA_OUT_SIZE_SHIFT 0 +# define I2S_DWS_DATA_OUT_16BIT (0<<I2S_DWS_DATA_OUT_SIZE_SHIFT) +# define I2S_DWS_DATA_OUT_24BIT (3<<I2S_DWS_DATA_OUT_SIZE_SHIFT) + + +/* unknown */ +#define I2S_REG_PEAK_LEVEL_SEL 0x70 + +/* unknown */ +#define I2S_REG_PEAK_LEVEL_IN0 0x80 + +/* unknown */ +#define I2S_REG_PEAK_LEVEL_IN1 0x90 + +#endif /* __I2SBUS_INTERFACE_H */ diff --git a/sound/aoa/soundbus/i2sbus/pcm.c b/sound/aoa/soundbus/i2sbus/pcm.c new file mode 100644 index 0000000000..07df5cc0f2 --- /dev/null +++ b/sound/aoa/soundbus/i2sbus/pcm.c @@ -0,0 +1,1052 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * i2sbus driver -- pcm routines + * + * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> + */ + +#include <linux/io.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <sound/core.h> +#include <asm/macio.h> +#include <linux/pci.h> +#include <linux/module.h> +#include "../soundbus.h" +#include "i2sbus.h" + +static inline void get_pcm_info(struct i2sbus_dev *i2sdev, int in, + struct pcm_info **pi, struct pcm_info **other) +{ + if (in) { + if (pi) + *pi = &i2sdev->in; + if (other) + *other = &i2sdev->out; + } else { + if (pi) + *pi = &i2sdev->out; + if (other) + *other = &i2sdev->in; + } +} + +static int clock_and_divisors(int mclk, int sclk, int rate, int *out) +{ + /* sclk must be derived from mclk! */ + if (mclk % sclk) + return -1; + /* derive sclk register value */ + if (i2s_sf_sclkdiv(mclk / sclk, out)) + return -1; + + if (I2S_CLOCK_SPEED_18MHz % (rate * mclk) == 0) { + if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_18MHz / (rate * mclk), out)) { + *out |= I2S_SF_CLOCK_SOURCE_18MHz; + return 0; + } + } + if (I2S_CLOCK_SPEED_45MHz % (rate * mclk) == 0) { + if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_45MHz / (rate * mclk), out)) { + *out |= I2S_SF_CLOCK_SOURCE_45MHz; + return 0; + } + } + if (I2S_CLOCK_SPEED_49MHz % (rate * mclk) == 0) { + if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_49MHz / (rate * mclk), out)) { + *out |= I2S_SF_CLOCK_SOURCE_49MHz; + return 0; + } + } + return -1; +} + +#define CHECK_RATE(rate) \ + do { if (rates & SNDRV_PCM_RATE_ ##rate) { \ + int dummy; \ + if (clock_and_divisors(sysclock_factor, \ + bus_factor, rate, &dummy)) \ + rates &= ~SNDRV_PCM_RATE_ ##rate; \ + } } while (0) + +static int i2sbus_pcm_open(struct i2sbus_dev *i2sdev, int in) +{ + struct pcm_info *pi, *other; + struct soundbus_dev *sdev; + int masks_inited = 0, err; + struct codec_info_item *cii, *rev; + struct snd_pcm_hardware *hw; + u64 formats = 0; + unsigned int rates = 0; + struct transfer_info v; + int result = 0; + int bus_factor = 0, sysclock_factor = 0; + int found_this; + + mutex_lock(&i2sdev->lock); + + get_pcm_info(i2sdev, in, &pi, &other); + + hw = &pi->substream->runtime->hw; + sdev = &i2sdev->sound; + + if (pi->active) { + /* alsa messed up */ + result = -EBUSY; + goto out_unlock; + } + + /* we now need to assign the hw */ + list_for_each_entry(cii, &sdev->codec_list, list) { + struct transfer_info *ti = cii->codec->transfers; + bus_factor = cii->codec->bus_factor; + sysclock_factor = cii->codec->sysclock_factor; + while (ti->formats && ti->rates) { + v = *ti; + if (ti->transfer_in == in + && cii->codec->usable(cii, ti, &v)) { + if (masks_inited) { + formats &= v.formats; + rates &= v.rates; + } else { + formats = v.formats; + rates = v.rates; + masks_inited = 1; + } + } + ti++; + } + } + if (!masks_inited || !bus_factor || !sysclock_factor) { + result = -ENODEV; + goto out_unlock; + } + /* bus dependent stuff */ + hw->info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_RESUME | + SNDRV_PCM_INFO_JOINT_DUPLEX; + + CHECK_RATE(5512); + CHECK_RATE(8000); + CHECK_RATE(11025); + CHECK_RATE(16000); + CHECK_RATE(22050); + CHECK_RATE(32000); + CHECK_RATE(44100); + CHECK_RATE(48000); + CHECK_RATE(64000); + CHECK_RATE(88200); + CHECK_RATE(96000); + CHECK_RATE(176400); + CHECK_RATE(192000); + hw->rates = rates; + + /* well. the codec might want 24 bits only, and we'll + * ever only transfer 24 bits, but they are top-aligned! + * So for alsa, we claim that we're doing full 32 bit + * while in reality we'll ignore the lower 8 bits of + * that when doing playback (they're transferred as 0 + * as far as I know, no codecs we have are 32-bit capable + * so I can't really test) and when doing recording we'll + * always have those lower 8 bits recorded as 0 */ + if (formats & SNDRV_PCM_FMTBIT_S24_BE) + formats |= SNDRV_PCM_FMTBIT_S32_BE; + if (formats & SNDRV_PCM_FMTBIT_U24_BE) + formats |= SNDRV_PCM_FMTBIT_U32_BE; + /* now mask off what we can support. I suppose we could + * also support S24_3LE and some similar formats, but I + * doubt there's a codec that would be able to use that, + * so we don't support it here. */ + hw->formats = formats & (SNDRV_PCM_FMTBIT_S16_BE | + SNDRV_PCM_FMTBIT_U16_BE | + SNDRV_PCM_FMTBIT_S32_BE | + SNDRV_PCM_FMTBIT_U32_BE); + + /* we need to set the highest and lowest rate possible. + * These are the highest and lowest rates alsa can + * support properly in its bitfield. + * Below, we'll use that to restrict to the rate + * currently in use (if any). */ + hw->rate_min = 5512; + hw->rate_max = 192000; + /* if the other stream is active, then we can only + * support what it is currently using. + * FIXME: I lied. This comment is wrong. We can support + * anything that works with the same serial format, ie. + * when recording 24 bit sound we can well play 16 bit + * sound at the same time iff using the same transfer mode. + */ + if (other->active) { + /* FIXME: is this guaranteed by the alsa api? */ + hw->formats &= pcm_format_to_bits(i2sdev->format); + /* see above, restrict rates to the one we already have */ + hw->rate_min = i2sdev->rate; + hw->rate_max = i2sdev->rate; + } + + hw->channels_min = 2; + hw->channels_max = 2; + /* these are somewhat arbitrary */ + hw->buffer_bytes_max = 131072; + hw->period_bytes_min = 256; + hw->period_bytes_max = 16384; + hw->periods_min = 3; + hw->periods_max = MAX_DBDMA_COMMANDS; + err = snd_pcm_hw_constraint_integer(pi->substream->runtime, + SNDRV_PCM_HW_PARAM_PERIODS); + if (err < 0) { + result = err; + goto out_unlock; + } + list_for_each_entry(cii, &sdev->codec_list, list) { + if (cii->codec->open) { + err = cii->codec->open(cii, pi->substream); + if (err) { + result = err; + /* unwind */ + found_this = 0; + list_for_each_entry_reverse(rev, + &sdev->codec_list, list) { + if (found_this && rev->codec->close) { + rev->codec->close(rev, + pi->substream); + } + if (rev == cii) + found_this = 1; + } + goto out_unlock; + } + } + } + + out_unlock: + mutex_unlock(&i2sdev->lock); + return result; +} + +#undef CHECK_RATE + +static int i2sbus_pcm_close(struct i2sbus_dev *i2sdev, int in) +{ + struct codec_info_item *cii; + struct pcm_info *pi; + int err = 0, tmp; + + mutex_lock(&i2sdev->lock); + + get_pcm_info(i2sdev, in, &pi, NULL); + + list_for_each_entry(cii, &i2sdev->sound.codec_list, list) { + if (cii->codec->close) { + tmp = cii->codec->close(cii, pi->substream); + if (tmp) + err = tmp; + } + } + + pi->substream = NULL; + pi->active = 0; + mutex_unlock(&i2sdev->lock); + return err; +} + +static void i2sbus_wait_for_stop(struct i2sbus_dev *i2sdev, + struct pcm_info *pi) +{ + unsigned long flags; + DECLARE_COMPLETION_ONSTACK(done); + long timeout; + + spin_lock_irqsave(&i2sdev->low_lock, flags); + if (pi->dbdma_ring.stopping) { + pi->stop_completion = &done; + spin_unlock_irqrestore(&i2sdev->low_lock, flags); + timeout = wait_for_completion_timeout(&done, HZ); + spin_lock_irqsave(&i2sdev->low_lock, flags); + pi->stop_completion = NULL; + if (timeout == 0) { + /* timeout expired, stop dbdma forcefully */ + printk(KERN_ERR "i2sbus_wait_for_stop: timed out\n"); + /* make sure RUN, PAUSE and S0 bits are cleared */ + out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16); + pi->dbdma_ring.stopping = 0; + timeout = 10; + while (in_le32(&pi->dbdma->status) & ACTIVE) { + if (--timeout <= 0) + break; + udelay(1); + } + } + } + spin_unlock_irqrestore(&i2sdev->low_lock, flags); +} + +#ifdef CONFIG_PM +void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev) +{ + struct pcm_info *pi; + + get_pcm_info(i2sdev, 0, &pi, NULL); + i2sbus_wait_for_stop(i2sdev, pi); + get_pcm_info(i2sdev, 1, &pi, NULL); + i2sbus_wait_for_stop(i2sdev, pi); +} +#endif + +static inline int i2sbus_hw_free(struct snd_pcm_substream *substream, int in) +{ + struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); + struct pcm_info *pi; + + get_pcm_info(i2sdev, in, &pi, NULL); + if (pi->dbdma_ring.stopping) + i2sbus_wait_for_stop(i2sdev, pi); + return 0; +} + +static int i2sbus_playback_hw_free(struct snd_pcm_substream *substream) +{ + return i2sbus_hw_free(substream, 0); +} + +static int i2sbus_record_hw_free(struct snd_pcm_substream *substream) +{ + return i2sbus_hw_free(substream, 1); +} + +static int i2sbus_pcm_prepare(struct i2sbus_dev *i2sdev, int in) +{ + /* whee. Hard work now. The user has selected a bitrate + * and bit format, so now we have to program our + * I2S controller appropriately. */ + struct snd_pcm_runtime *runtime; + struct dbdma_cmd *command; + int i, periodsize, nperiods; + dma_addr_t offset; + struct bus_info bi; + struct codec_info_item *cii; + int sfr = 0; /* serial format register */ + int dws = 0; /* data word sizes reg */ + int input_16bit; + struct pcm_info *pi, *other; + int cnt; + int result = 0; + unsigned int cmd, stopaddr; + + mutex_lock(&i2sdev->lock); + + get_pcm_info(i2sdev, in, &pi, &other); + + if (pi->dbdma_ring.running) { + result = -EBUSY; + goto out_unlock; + } + if (pi->dbdma_ring.stopping) + i2sbus_wait_for_stop(i2sdev, pi); + + if (!pi->substream || !pi->substream->runtime) { + result = -EINVAL; + goto out_unlock; + } + + runtime = pi->substream->runtime; + pi->active = 1; + if (other->active && + ((i2sdev->format != runtime->format) + || (i2sdev->rate != runtime->rate))) { + result = -EINVAL; + goto out_unlock; + } + + i2sdev->format = runtime->format; + i2sdev->rate = runtime->rate; + + periodsize = snd_pcm_lib_period_bytes(pi->substream); + nperiods = pi->substream->runtime->periods; + pi->current_period = 0; + + /* generate dbdma command ring first */ + command = pi->dbdma_ring.cmds; + memset(command, 0, (nperiods + 2) * sizeof(struct dbdma_cmd)); + + /* commands to DMA to/from the ring */ + /* + * For input, we need to do a graceful stop; if we abort + * the DMA, we end up with leftover bytes that corrupt + * the next recording. To do this we set the S0 status + * bit and wait for the DMA controller to stop. Each + * command has a branch condition to + * make it branch to a stop command if S0 is set. + * On input we also need to wait for the S7 bit to be + * set before turning off the DMA controller. + * In fact we do the graceful stop for output as well. + */ + offset = runtime->dma_addr; + cmd = (in? INPUT_MORE: OUTPUT_MORE) | BR_IFSET | INTR_ALWAYS; + stopaddr = pi->dbdma_ring.bus_cmd_start + + (nperiods + 1) * sizeof(struct dbdma_cmd); + for (i = 0; i < nperiods; i++, command++, offset += periodsize) { + command->command = cpu_to_le16(cmd); + command->cmd_dep = cpu_to_le32(stopaddr); + command->phy_addr = cpu_to_le32(offset); + command->req_count = cpu_to_le16(periodsize); + } + + /* branch back to beginning of ring */ + command->command = cpu_to_le16(DBDMA_NOP | BR_ALWAYS); + command->cmd_dep = cpu_to_le32(pi->dbdma_ring.bus_cmd_start); + command++; + + /* set stop command */ + command->command = cpu_to_le16(DBDMA_STOP); + + /* ok, let's set the serial format and stuff */ + switch (runtime->format) { + /* 16 bit formats */ + case SNDRV_PCM_FORMAT_S16_BE: + case SNDRV_PCM_FORMAT_U16_BE: + /* FIXME: if we add different bus factors we need to + * do more here!! */ + bi.bus_factor = 0; + list_for_each_entry(cii, &i2sdev->sound.codec_list, list) { + bi.bus_factor = cii->codec->bus_factor; + break; + } + if (!bi.bus_factor) { + result = -ENODEV; + goto out_unlock; + } + input_16bit = 1; + break; + case SNDRV_PCM_FORMAT_S32_BE: + case SNDRV_PCM_FORMAT_U32_BE: + /* force 64x bus speed, otherwise the data cannot be + * transferred quickly enough! */ + bi.bus_factor = 64; + input_16bit = 0; + break; + default: + result = -EINVAL; + goto out_unlock; + } + /* we assume all sysclocks are the same! */ + list_for_each_entry(cii, &i2sdev->sound.codec_list, list) { + bi.sysclock_factor = cii->codec->sysclock_factor; + break; + } + + if (clock_and_divisors(bi.sysclock_factor, + bi.bus_factor, + runtime->rate, + &sfr) < 0) { + result = -EINVAL; + goto out_unlock; + } + switch (bi.bus_factor) { + case 32: + sfr |= I2S_SF_SERIAL_FORMAT_I2S_32X; + break; + case 64: + sfr |= I2S_SF_SERIAL_FORMAT_I2S_64X; + break; + } + /* FIXME: THIS ASSUMES MASTER ALL THE TIME */ + sfr |= I2S_SF_SCLK_MASTER; + + list_for_each_entry(cii, &i2sdev->sound.codec_list, list) { + int err = 0; + if (cii->codec->prepare) + err = cii->codec->prepare(cii, &bi, pi->substream); + if (err) { + result = err; + goto out_unlock; + } + } + /* codecs are fine with it, so set our clocks */ + if (input_16bit) + dws = (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) | + (2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) | + I2S_DWS_DATA_IN_16BIT | I2S_DWS_DATA_OUT_16BIT; + else + dws = (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) | + (2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) | + I2S_DWS_DATA_IN_24BIT | I2S_DWS_DATA_OUT_24BIT; + + /* early exit if already programmed correctly */ + /* not locking these is fine since we touch them only in this function */ + if (in_le32(&i2sdev->intfregs->serial_format) == sfr + && in_le32(&i2sdev->intfregs->data_word_sizes) == dws) + goto out_unlock; + + /* let's notify the codecs about clocks going away. + * For now we only do mastering on the i2s cell... */ + list_for_each_entry(cii, &i2sdev->sound.codec_list, list) + if (cii->codec->switch_clock) + cii->codec->switch_clock(cii, CLOCK_SWITCH_PREPARE_SLAVE); + + i2sbus_control_enable(i2sdev->control, i2sdev); + i2sbus_control_cell(i2sdev->control, i2sdev, 1); + + out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED); + + i2sbus_control_clock(i2sdev->control, i2sdev, 0); + + msleep(1); + + /* wait for clock stopped. This can apparently take a while... */ + cnt = 100; + while (cnt-- && + !(in_le32(&i2sdev->intfregs->intr_ctl) & I2S_PENDING_CLOCKS_STOPPED)) { + msleep(5); + } + out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED); + + /* not locking these is fine since we touch them only in this function */ + out_le32(&i2sdev->intfregs->serial_format, sfr); + out_le32(&i2sdev->intfregs->data_word_sizes, dws); + + i2sbus_control_enable(i2sdev->control, i2sdev); + i2sbus_control_cell(i2sdev->control, i2sdev, 1); + i2sbus_control_clock(i2sdev->control, i2sdev, 1); + msleep(1); + + list_for_each_entry(cii, &i2sdev->sound.codec_list, list) + if (cii->codec->switch_clock) + cii->codec->switch_clock(cii, CLOCK_SWITCH_SLAVE); + + out_unlock: + mutex_unlock(&i2sdev->lock); + return result; +} + +#ifdef CONFIG_PM +void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev) +{ + i2sbus_pcm_prepare(i2sdev, 0); + i2sbus_pcm_prepare(i2sdev, 1); +} +#endif + +static int i2sbus_pcm_trigger(struct i2sbus_dev *i2sdev, int in, int cmd) +{ + struct codec_info_item *cii; + struct pcm_info *pi; + int result = 0; + unsigned long flags; + + spin_lock_irqsave(&i2sdev->low_lock, flags); + + get_pcm_info(i2sdev, in, &pi, NULL); + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + if (pi->dbdma_ring.running) { + result = -EALREADY; + goto out_unlock; + } + list_for_each_entry(cii, &i2sdev->sound.codec_list, list) + if (cii->codec->start) + cii->codec->start(cii, pi->substream); + pi->dbdma_ring.running = 1; + + if (pi->dbdma_ring.stopping) { + /* Clear the S0 bit, then see if we stopped yet */ + out_le32(&pi->dbdma->control, 1 << 16); + if (in_le32(&pi->dbdma->status) & ACTIVE) { + /* possible race here? */ + udelay(10); + if (in_le32(&pi->dbdma->status) & ACTIVE) { + pi->dbdma_ring.stopping = 0; + goto out_unlock; /* keep running */ + } + } + } + + /* make sure RUN, PAUSE and S0 bits are cleared */ + out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16); + + /* set branch condition select register */ + out_le32(&pi->dbdma->br_sel, (1 << 16) | 1); + + /* write dma command buffer address to the dbdma chip */ + out_le32(&pi->dbdma->cmdptr, pi->dbdma_ring.bus_cmd_start); + + /* initialize the frame count and current period */ + pi->current_period = 0; + pi->frame_count = in_le32(&i2sdev->intfregs->frame_count); + + /* set the DMA controller running */ + out_le32(&pi->dbdma->control, (RUN << 16) | RUN); + + /* off you go! */ + break; + + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + if (!pi->dbdma_ring.running) { + result = -EALREADY; + goto out_unlock; + } + pi->dbdma_ring.running = 0; + + /* Set the S0 bit to make the DMA branch to the stop cmd */ + out_le32(&pi->dbdma->control, (1 << 16) | 1); + pi->dbdma_ring.stopping = 1; + + list_for_each_entry(cii, &i2sdev->sound.codec_list, list) + if (cii->codec->stop) + cii->codec->stop(cii, pi->substream); + break; + default: + result = -EINVAL; + goto out_unlock; + } + + out_unlock: + spin_unlock_irqrestore(&i2sdev->low_lock, flags); + return result; +} + +static snd_pcm_uframes_t i2sbus_pcm_pointer(struct i2sbus_dev *i2sdev, int in) +{ + struct pcm_info *pi; + u32 fc; + + get_pcm_info(i2sdev, in, &pi, NULL); + + fc = in_le32(&i2sdev->intfregs->frame_count); + fc = fc - pi->frame_count; + + if (fc >= pi->substream->runtime->buffer_size) + fc %= pi->substream->runtime->buffer_size; + return fc; +} + +static inline void handle_interrupt(struct i2sbus_dev *i2sdev, int in) +{ + struct pcm_info *pi; + u32 fc, nframes; + u32 status; + int timeout, i; + int dma_stopped = 0; + struct snd_pcm_runtime *runtime; + + spin_lock(&i2sdev->low_lock); + get_pcm_info(i2sdev, in, &pi, NULL); + if (!pi->dbdma_ring.running && !pi->dbdma_ring.stopping) + goto out_unlock; + + i = pi->current_period; + runtime = pi->substream->runtime; + while (pi->dbdma_ring.cmds[i].xfer_status) { + if (le16_to_cpu(pi->dbdma_ring.cmds[i].xfer_status) & BT) + /* + * BT is the branch taken bit. If it took a branch + * it is because we set the S0 bit to make it + * branch to the stop command. + */ + dma_stopped = 1; + pi->dbdma_ring.cmds[i].xfer_status = 0; + + if (++i >= runtime->periods) { + i = 0; + pi->frame_count += runtime->buffer_size; + } + pi->current_period = i; + + /* + * Check the frame count. The DMA tends to get a bit + * ahead of the frame counter, which confuses the core. + */ + fc = in_le32(&i2sdev->intfregs->frame_count); + nframes = i * runtime->period_size; + if (fc < pi->frame_count + nframes) + pi->frame_count = fc - nframes; + } + + if (dma_stopped) { + timeout = 1000; + for (;;) { + status = in_le32(&pi->dbdma->status); + if (!(status & ACTIVE) && (!in || (status & 0x80))) + break; + if (--timeout <= 0) { + printk(KERN_ERR "i2sbus: timed out " + "waiting for DMA to stop!\n"); + break; + } + udelay(1); + } + + /* Turn off DMA controller, clear S0 bit */ + out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16); + + pi->dbdma_ring.stopping = 0; + if (pi->stop_completion) + complete(pi->stop_completion); + } + + if (!pi->dbdma_ring.running) + goto out_unlock; + spin_unlock(&i2sdev->low_lock); + /* may call _trigger again, hence needs to be unlocked */ + snd_pcm_period_elapsed(pi->substream); + return; + + out_unlock: + spin_unlock(&i2sdev->low_lock); +} + +irqreturn_t i2sbus_tx_intr(int irq, void *devid) +{ + handle_interrupt((struct i2sbus_dev *)devid, 0); + return IRQ_HANDLED; +} + +irqreturn_t i2sbus_rx_intr(int irq, void *devid) +{ + handle_interrupt((struct i2sbus_dev *)devid, 1); + return IRQ_HANDLED; +} + +static int i2sbus_playback_open(struct snd_pcm_substream *substream) +{ + struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); + + if (!i2sdev) + return -EINVAL; + i2sdev->out.substream = substream; + return i2sbus_pcm_open(i2sdev, 0); +} + +static int i2sbus_playback_close(struct snd_pcm_substream *substream) +{ + struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); + int err; + + if (!i2sdev) + return -EINVAL; + if (i2sdev->out.substream != substream) + return -EINVAL; + err = i2sbus_pcm_close(i2sdev, 0); + if (!err) + i2sdev->out.substream = NULL; + return err; +} + +static int i2sbus_playback_prepare(struct snd_pcm_substream *substream) +{ + struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); + + if (!i2sdev) + return -EINVAL; + if (i2sdev->out.substream != substream) + return -EINVAL; + return i2sbus_pcm_prepare(i2sdev, 0); +} + +static int i2sbus_playback_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); + + if (!i2sdev) + return -EINVAL; + if (i2sdev->out.substream != substream) + return -EINVAL; + return i2sbus_pcm_trigger(i2sdev, 0, cmd); +} + +static snd_pcm_uframes_t i2sbus_playback_pointer(struct snd_pcm_substream + *substream) +{ + struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); + + if (!i2sdev) + return -EINVAL; + if (i2sdev->out.substream != substream) + return 0; + return i2sbus_pcm_pointer(i2sdev, 0); +} + +static const struct snd_pcm_ops i2sbus_playback_ops = { + .open = i2sbus_playback_open, + .close = i2sbus_playback_close, + .hw_free = i2sbus_playback_hw_free, + .prepare = i2sbus_playback_prepare, + .trigger = i2sbus_playback_trigger, + .pointer = i2sbus_playback_pointer, +}; + +static int i2sbus_record_open(struct snd_pcm_substream *substream) +{ + struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); + + if (!i2sdev) + return -EINVAL; + i2sdev->in.substream = substream; + return i2sbus_pcm_open(i2sdev, 1); +} + +static int i2sbus_record_close(struct snd_pcm_substream *substream) +{ + struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); + int err; + + if (!i2sdev) + return -EINVAL; + if (i2sdev->in.substream != substream) + return -EINVAL; + err = i2sbus_pcm_close(i2sdev, 1); + if (!err) + i2sdev->in.substream = NULL; + return err; +} + +static int i2sbus_record_prepare(struct snd_pcm_substream *substream) +{ + struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); + + if (!i2sdev) + return -EINVAL; + if (i2sdev->in.substream != substream) + return -EINVAL; + return i2sbus_pcm_prepare(i2sdev, 1); +} + +static int i2sbus_record_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); + + if (!i2sdev) + return -EINVAL; + if (i2sdev->in.substream != substream) + return -EINVAL; + return i2sbus_pcm_trigger(i2sdev, 1, cmd); +} + +static snd_pcm_uframes_t i2sbus_record_pointer(struct snd_pcm_substream + *substream) +{ + struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); + + if (!i2sdev) + return -EINVAL; + if (i2sdev->in.substream != substream) + return 0; + return i2sbus_pcm_pointer(i2sdev, 1); +} + +static const struct snd_pcm_ops i2sbus_record_ops = { + .open = i2sbus_record_open, + .close = i2sbus_record_close, + .hw_free = i2sbus_record_hw_free, + .prepare = i2sbus_record_prepare, + .trigger = i2sbus_record_trigger, + .pointer = i2sbus_record_pointer, +}; + +static void i2sbus_private_free(struct snd_pcm *pcm) +{ + struct i2sbus_dev *i2sdev = snd_pcm_chip(pcm); + struct codec_info_item *p, *tmp; + + i2sdev->sound.pcm = NULL; + i2sdev->out.created = 0; + i2sdev->in.created = 0; + list_for_each_entry_safe(p, tmp, &i2sdev->sound.codec_list, list) { + printk(KERN_ERR "i2sbus: a codec didn't unregister!\n"); + list_del(&p->list); + module_put(p->codec->owner); + kfree(p); + } + soundbus_dev_put(&i2sdev->sound); + module_put(THIS_MODULE); +} + +int +i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card, + struct codec_info *ci, void *data) +{ + int err, in = 0, out = 0; + struct transfer_info *tmp; + struct i2sbus_dev *i2sdev = soundbus_dev_to_i2sbus_dev(dev); + struct codec_info_item *cii; + + if (!dev->pcmname || dev->pcmid == -1) { + printk(KERN_ERR "i2sbus: pcm name and id must be set!\n"); + return -EINVAL; + } + + list_for_each_entry(cii, &dev->codec_list, list) { + if (cii->codec_data == data) + return -EALREADY; + } + + if (!ci->transfers || !ci->transfers->formats + || !ci->transfers->rates || !ci->usable) + return -EINVAL; + + /* we currently code the i2s transfer on the clock, and support only + * 32 and 64 */ + if (ci->bus_factor != 32 && ci->bus_factor != 64) + return -EINVAL; + + /* If you want to fix this, you need to keep track of what transport infos + * are to be used, which codecs they belong to, and then fix all the + * sysclock/busclock stuff above to depend on which is usable */ + list_for_each_entry(cii, &dev->codec_list, list) { + if (cii->codec->sysclock_factor != ci->sysclock_factor) { + printk(KERN_DEBUG + "cannot yet handle multiple different sysclocks!\n"); + return -EINVAL; + } + if (cii->codec->bus_factor != ci->bus_factor) { + printk(KERN_DEBUG + "cannot yet handle multiple different bus clocks!\n"); + return -EINVAL; + } + } + + tmp = ci->transfers; + while (tmp->formats && tmp->rates) { + if (tmp->transfer_in) + in = 1; + else + out = 1; + tmp++; + } + + cii = kzalloc(sizeof(struct codec_info_item), GFP_KERNEL); + if (!cii) + return -ENOMEM; + + /* use the private data to point to the codec info */ + cii->sdev = soundbus_dev_get(dev); + cii->codec = ci; + cii->codec_data = data; + + if (!cii->sdev) { + printk(KERN_DEBUG + "i2sbus: failed to get soundbus dev reference\n"); + err = -ENODEV; + goto out_free_cii; + } + + if (!try_module_get(THIS_MODULE)) { + printk(KERN_DEBUG "i2sbus: failed to get module reference!\n"); + err = -EBUSY; + goto out_put_sdev; + } + + if (!try_module_get(ci->owner)) { + printk(KERN_DEBUG + "i2sbus: failed to get module reference to codec owner!\n"); + err = -EBUSY; + goto out_put_this_module; + } + + if (!dev->pcm) { + err = snd_pcm_new(card, dev->pcmname, dev->pcmid, 0, 0, + &dev->pcm); + if (err) { + printk(KERN_DEBUG "i2sbus: failed to create pcm\n"); + goto out_put_ci_module; + } + } + + /* ALSA yet again sucks. + * If it is ever fixed, remove this line. See below. */ + out = in = 1; + + if (!i2sdev->out.created && out) { + if (dev->pcm->card != card) { + /* eh? */ + printk(KERN_ERR + "Can't attach same bus to different cards!\n"); + err = -EINVAL; + goto out_put_ci_module; + } + err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 1); + if (err) + goto out_put_ci_module; + snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, + &i2sbus_playback_ops); + dev->pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].dev->parent = + &dev->ofdev.dev; + i2sdev->out.created = 1; + } + + if (!i2sdev->in.created && in) { + if (dev->pcm->card != card) { + printk(KERN_ERR + "Can't attach same bus to different cards!\n"); + err = -EINVAL; + goto out_put_ci_module; + } + err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 1); + if (err) + goto out_put_ci_module; + snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, + &i2sbus_record_ops); + dev->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].dev->parent = + &dev->ofdev.dev; + i2sdev->in.created = 1; + } + + /* so we have to register the pcm after adding any substream + * to it because alsa doesn't create the devices for the + * substreams when we add them later. + * Therefore, force in and out on both busses (above) and + * register the pcm now instead of just after creating it. + */ + err = snd_device_register(card, dev->pcm); + if (err) { + printk(KERN_ERR "i2sbus: error registering new pcm\n"); + goto out_put_ci_module; + } + /* no errors any more, so let's add this to our list */ + list_add(&cii->list, &dev->codec_list); + + dev->pcm->private_data = i2sdev; + dev->pcm->private_free = i2sbus_private_free; + + /* well, we really should support scatter/gather DMA */ + snd_pcm_set_managed_buffer_all( + dev->pcm, SNDRV_DMA_TYPE_DEV, + &macio_get_pci_dev(i2sdev->macio)->dev, + 64 * 1024, 64 * 1024); + + return 0; + out_put_ci_module: + module_put(ci->owner); + out_put_this_module: + module_put(THIS_MODULE); + out_put_sdev: + soundbus_dev_put(dev); + out_free_cii: + kfree(cii); + return err; +} + +void i2sbus_detach_codec(struct soundbus_dev *dev, void *data) +{ + struct codec_info_item *cii = NULL, *i; + + list_for_each_entry(i, &dev->codec_list, list) { + if (i->codec_data == data) { + cii = i; + break; + } + } + if (cii) { + list_del(&cii->list); + module_put(cii->codec->owner); + kfree(cii); + } + /* no more codecs, but still a pcm? */ + if (list_empty(&dev->codec_list) && dev->pcm) { + /* the actual cleanup is done by the callback above! */ + snd_device_free(dev->pcm->card, dev->pcm); + } +} |