linux/drivers/soundwire/intel_init.c

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// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
// Copyright(c) 2015-17 Intel Corporation.
/*
* SDW Intel Init Routines
*
* Initializes and creates SDW devices based on ACPI and Hardware values
*/
#include <linux/acpi.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/auxiliary_bus.h>
#include <linux/pm_runtime.h>
#include <linux/soundwire/sdw_intel.h>
#include "cadence_master.h"
#include "intel.h"
static void intel_link_dev_release(struct device *dev)
{
struct auxiliary_device *auxdev = to_auxiliary_dev(dev);
struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);
kfree(ldev);
}
/* alloc, init and add link devices */
static struct sdw_intel_link_dev *intel_link_dev_register(struct sdw_intel_res *res,
struct sdw_intel_ctx *ctx,
struct fwnode_handle *fwnode,
const char *name,
int link_id)
{
struct sdw_intel_link_dev *ldev;
struct sdw_intel_link_res *link;
struct auxiliary_device *auxdev;
int ret;
ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
if (!ldev)
return ERR_PTR(-ENOMEM);
auxdev = &ldev->auxdev;
auxdev->name = name;
auxdev->dev.parent = res->parent;
auxdev->dev.fwnode = fwnode;
auxdev->dev.release = intel_link_dev_release;
/* we don't use an IDA since we already have a link ID */
auxdev->id = link_id;
/*
* keep a handle on the allocated memory, to be used in all other functions.
* Since the same pattern is used to skip links that are not enabled, there is
* no need to check if ctx->ldev[i] is NULL later on.
*/
ctx->ldev[link_id] = ldev;
/* Add link information used in the driver probe */
link = &ldev->link_res;
link->mmio_base = res->mmio_base;
link->registers = res->mmio_base + SDW_LINK_BASE
+ (SDW_LINK_SIZE * link_id);
link->shim = res->mmio_base + res->shim_base;
link->alh = res->mmio_base + res->alh_base;
link->ops = res->ops;
link->dev = res->dev;
link->clock_stop_quirks = res->clock_stop_quirks;
link->shim_lock = &ctx->shim_lock;
link->shim_mask = &ctx->shim_mask;
link->link_mask = ctx->link_mask;
/* now follow the two-step init/add sequence */
ret = auxiliary_device_init(auxdev);
if (ret < 0) {
dev_err(res->parent, "failed to initialize link dev %s link_id %d\n",
name, link_id);
kfree(ldev);
return ERR_PTR(ret);
}
ret = auxiliary_device_add(&ldev->auxdev);
if (ret < 0) {
dev_err(res->parent, "failed to add link dev %s link_id %d\n",
ldev->auxdev.name, link_id);
/* ldev will be freed with the put_device() and .release sequence */
auxiliary_device_uninit(&ldev->auxdev);
return ERR_PTR(ret);
}
return ldev;
}
static void intel_link_dev_unregister(struct sdw_intel_link_dev *ldev)
{
auxiliary_device_delete(&ldev->auxdev);
auxiliary_device_uninit(&ldev->auxdev);
}
static int sdw_intel_cleanup(struct sdw_intel_ctx *ctx)
{
struct sdw_intel_link_dev *ldev;
u32 link_mask;
int i;
link_mask = ctx->link_mask;
for (i = 0; i < ctx->count; i++) {
if (!(link_mask & BIT(i)))
continue;
ldev = ctx->ldev[i];
pm_runtime_disable(&ldev->auxdev.dev);
if (!ldev->link_res.clock_stop_quirks)
pm_runtime_put_noidle(ldev->link_res.dev);
intel_link_dev_unregister(ldev);
}
return 0;
}
#define HDA_DSP_REG_ADSPIC2 (0x10)
#define HDA_DSP_REG_ADSPIS2 (0x14)
#define HDA_DSP_REG_ADSPIC2_SNDW BIT(5)
/**
* sdw_intel_enable_irq() - enable/disable Intel SoundWire IRQ
* @mmio_base: The mmio base of the control register
* @enable: true if enable
*/
void sdw_intel_enable_irq(void __iomem *mmio_base, bool enable)
{
u32 val;
val = readl(mmio_base + HDA_DSP_REG_ADSPIC2);
if (enable)
val |= HDA_DSP_REG_ADSPIC2_SNDW;
else
val &= ~HDA_DSP_REG_ADSPIC2_SNDW;
writel(val, mmio_base + HDA_DSP_REG_ADSPIC2);
}
EXPORT_SYMBOL_NS(sdw_intel_enable_irq, SOUNDWIRE_INTEL_INIT);
irqreturn_t sdw_intel_thread(int irq, void *dev_id)
{
struct sdw_intel_ctx *ctx = dev_id;
struct sdw_intel_link_res *link;
list_for_each_entry(link, &ctx->link_list, list)
sdw_cdns_irq(irq, link->cdns);
sdw_intel_enable_irq(ctx->mmio_base, true);
return IRQ_HANDLED;
}
EXPORT_SYMBOL_NS(sdw_intel_thread, SOUNDWIRE_INTEL_INIT);
static struct sdw_intel_ctx
*sdw_intel_probe_controller(struct sdw_intel_res *res)
{
struct sdw_intel_link_res *link;
struct sdw_intel_link_dev *ldev;
struct sdw_intel_ctx *ctx;
struct acpi_device *adev;
struct sdw_slave *slave;
struct list_head *node;
struct sdw_bus *bus;
u32 link_mask;
int num_slaves = 0;
int count;
int i;
if (!res)
return NULL;
if (acpi_bus_get_device(res->handle, &adev))
return NULL;
if (!res->count)
return NULL;
count = res->count;
dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count);
/*
* we need to alloc/free memory manually and can't use devm:
* this routine may be called from a workqueue, and not from
* the parent .probe.
* If devm_ was used, the memory might never be freed on errors.
*/
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return NULL;
ctx->count = count;
/*
* allocate the array of pointers. The link-specific data is allocated
* as part of the first loop below and released with the auxiliary_device_uninit().
* If some links are disabled, the link pointer will remain NULL. Given that the
* number of links is small, this is simpler than using a list to keep track of links.
*/
ctx->ldev = kcalloc(ctx->count, sizeof(*ctx->ldev), GFP_KERNEL);
if (!ctx->ldev) {
kfree(ctx);
return NULL;
}
ctx->mmio_base = res->mmio_base;
ctx->shim_base = res->shim_base;
ctx->alh_base = res->alh_base;
ctx->link_mask = res->link_mask;
ctx->handle = res->handle;
mutex_init(&ctx->shim_lock);
link_mask = ctx->link_mask;
INIT_LIST_HEAD(&ctx->link_list);
for (i = 0; i < count; i++) {
if (!(link_mask & BIT(i)))
continue;
/*
* init and add a device for each link
*
* The name of the device will be soundwire_intel.link.[i],
* with the "soundwire_intel" module prefix automatically added
* by the auxiliary bus core.
*/
ldev = intel_link_dev_register(res,
ctx,
acpi_fwnode_handle(adev),
"link",
i);
if (IS_ERR(ldev))
goto err;
link = &ldev->link_res;
link->cdns = auxiliary_get_drvdata(&ldev->auxdev);
if (!link->cdns) {
dev_err(&adev->dev, "failed to get link->cdns\n");
/*
* 1 will be subtracted from i in the err label, but we need to call
* intel_link_dev_unregister for this ldev, so plus 1 now
*/
i++;
goto err;
}
list_add_tail(&link->list, &ctx->link_list);
bus = &link->cdns->bus;
/* Calculate number of slaves */
list_for_each(node, &bus->slaves)
num_slaves++;
}
ctx->ids = kcalloc(num_slaves, sizeof(*ctx->ids), GFP_KERNEL);
if (!ctx->ids)
goto err;
ctx->num_slaves = num_slaves;
i = 0;
list_for_each_entry(link, &ctx->link_list, list) {
bus = &link->cdns->bus;
list_for_each_entry(slave, &bus->slaves, node) {
ctx->ids[i].id = slave->id;
ctx->ids[i].link_id = bus->link_id;
i++;
}
}
return ctx;
err:
while (i--) {
if (!(link_mask & BIT(i)))
continue;
ldev = ctx->ldev[i];
intel_link_dev_unregister(ldev);
}
kfree(ctx->ldev);
kfree(ctx);
return NULL;
}
static int
sdw_intel_startup_controller(struct sdw_intel_ctx *ctx)
{
struct acpi_device *adev;
struct sdw_intel_link_dev *ldev;
u32 caps;
u32 link_mask;
int i;
if (acpi_bus_get_device(ctx->handle, &adev))
return -EINVAL;
/* Check SNDWLCAP.LCOUNT */
caps = ioread32(ctx->mmio_base + ctx->shim_base + SDW_SHIM_LCAP);
caps &= GENMASK(2, 0);
/* Check HW supported vs property value */
if (caps < ctx->count) {
dev_err(&adev->dev,
"BIOS master count is larger than hardware capabilities\n");
return -EINVAL;
}
if (!ctx->ldev)
return -EINVAL;
link_mask = ctx->link_mask;
/* Startup SDW Master devices */
for (i = 0; i < ctx->count; i++) {
if (!(link_mask & BIT(i)))
continue;
ldev = ctx->ldev[i];
intel_link_startup(&ldev->auxdev);
if (!ldev->link_res.clock_stop_quirks) {
/*
* we need to prevent the parent PCI device
* from entering pm_runtime suspend, so that
* power rails to the SoundWire IP are not
* turned off.
*/
pm_runtime_get_noresume(ldev->link_res.dev);
}
}
return 0;
}
/**
* sdw_intel_probe() - SoundWire Intel probe routine
* @res: resource data
*
* This registers an auxiliary device for each Master handled by the controller,
* and SoundWire Master and Slave devices will be created by the auxiliary
* device probe. All the information necessary is stored in the context, and
* the res argument pointer can be freed after this step.
* This function will be called after sdw_intel_acpi_scan() by SOF probe.
*/
struct sdw_intel_ctx
*sdw_intel_probe(struct sdw_intel_res *res)
{
return sdw_intel_probe_controller(res);
}
EXPORT_SYMBOL_NS(sdw_intel_probe, SOUNDWIRE_INTEL_INIT);
/**
* sdw_intel_startup() - SoundWire Intel startup
* @ctx: SoundWire context allocated in the probe
*
* Startup Intel SoundWire controller. This function will be called after
* Intel Audio DSP is powered up.
*/
int sdw_intel_startup(struct sdw_intel_ctx *ctx)
{
return sdw_intel_startup_controller(ctx);
}
EXPORT_SYMBOL_NS(sdw_intel_startup, SOUNDWIRE_INTEL_INIT);
/**
* sdw_intel_exit() - SoundWire Intel exit
* @ctx: SoundWire context allocated in the probe
*
* Delete the controller instances created and cleanup
*/
soundwire: intel: update interfaces between ASoC and SoundWire The current interfaces between ASoC and SoundWire are limited by the platform_device infrastructure to an init() and exit() (mapped to the platform driver.probe and .remove) To help with the platform detection, machine driver selection and management of power dependencies between DSP and SoundWire IP, the ASoC side requires: a) an ACPI scan helper, to report if any devices are exposed in the DSDT tables, and if any links are disabled by the BIOS. b) a probe helper that allocates the resources without actually starting the bus. c) a startup helper which does start the bus when all power dependencies are settled. d) an exit helper to free all resources e) an interrupt_enable/disable helper, typically invoked after the startup helper but also used in suspend routines. This patch moves all required interfaces to sdw_intel.h, mainly to allow SoundWire and ASoC parts to be merged separately once the header files are shared between trees. To avoid compilation issues, the conflicts in intel_init.c are blindly removed. This would in theory prevent the code from working, but since there are no users of the Intel Soundwire driver this has no impact. Functionality will be restored when the removal of platform devices is complete. Support for SoundWire + SOF builds will only be provided once all the required pieces are upstream. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20191212014507.28050-6-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-12-12 01:45:01 +00:00
void sdw_intel_exit(struct sdw_intel_ctx *ctx)
{
sdw_intel_cleanup(ctx);
kfree(ctx->ids);
kfree(ctx->ldev);
kfree(ctx);
}
EXPORT_SYMBOL_NS(sdw_intel_exit, SOUNDWIRE_INTEL_INIT);
void sdw_intel_process_wakeen_event(struct sdw_intel_ctx *ctx)
{
struct sdw_intel_link_dev *ldev;
u32 link_mask;
int i;
if (!ctx->ldev)
return;
link_mask = ctx->link_mask;
/* Startup SDW Master devices */
for (i = 0; i < ctx->count; i++) {
if (!(link_mask & BIT(i)))
continue;
ldev = ctx->ldev[i];
intel_link_process_wakeen_event(&ldev->auxdev);
}
}
EXPORT_SYMBOL_NS(sdw_intel_process_wakeen_event, SOUNDWIRE_INTEL_INIT);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Intel Soundwire Init Library");