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linux/drivers/soundwire/intel_init.c
Vinod Koul c30f929841 soundwire: intel_init: use FIELD_{GET|PREP} 
use FIELD_{GET|PREP} in intel_init driver to get/set field values
instead of open coding masks and shift operations.

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Tested-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200903114504.1202143-9-vkoul@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-09-04 14:46:42 +05:30

484 lines
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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/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/soundwire/sdw_intel.h>
#include "cadence_master.h"
#include "intel.h"
#define SDW_LINK_TYPE 4 /* from Intel ACPI documentation */
#define SDW_MAX_LINKS 4
#define SDW_SHIM_LCAP 0x0
#define SDW_SHIM_BASE 0x2C000
#define SDW_ALH_BASE 0x2C800
#define SDW_LINK_BASE 0x30000
#define SDW_LINK_SIZE 0x10000
static int ctrl_link_mask;
module_param_named(sdw_link_mask, ctrl_link_mask, int, 0444);
MODULE_PARM_DESC(sdw_link_mask, "Intel link mask (one bit per link)");
static bool is_link_enabled(struct fwnode_handle *fw_node, int i)
{
struct fwnode_handle *link;
char name[32];
u32 quirk_mask = 0;
/* Find master handle */
snprintf(name, sizeof(name),
"mipi-sdw-link-%d-subproperties", i);
link = fwnode_get_named_child_node(fw_node, name);
if (!link)
return false;
fwnode_property_read_u32(link,
"intel-quirk-mask",
&quirk_mask);
if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
return false;
return true;
}
static int sdw_intel_cleanup(struct sdw_intel_ctx *ctx)
{
struct sdw_intel_link_res *link = ctx->links;
u32 link_mask;
int i;
if (!link)
return 0;
link_mask = ctx->link_mask;
for (i = 0; i < ctx->count; i++, link++) {
if (!(link_mask & BIT(i)))
continue;
if (link->pdev) {
pm_runtime_disable(&link->pdev->dev);
platform_device_unregister(link->pdev);
}
if (!link->clock_stop_quirks)
pm_runtime_put_noidle(link->dev);
}
return 0;
}
static int
sdw_intel_scan_controller(struct sdw_intel_acpi_info *info)
{
struct acpi_device *adev;
int ret, i;
u8 count;
if (acpi_bus_get_device(info->handle, &adev))
return -EINVAL;
/* Found controller, find links supported */
count = 0;
ret = fwnode_property_read_u8_array(acpi_fwnode_handle(adev),
"mipi-sdw-master-count", &count, 1);
/*
* In theory we could check the number of links supported in
* hardware, but in that step we cannot assume SoundWire IP is
* powered.
*
* In addition, if the BIOS doesn't even provide this
* 'master-count' property then all the inits based on link
* masks will fail as well.
*
* We will check the hardware capabilities in the startup() step
*/
if (ret) {
dev_err(&adev->dev,
"Failed to read mipi-sdw-master-count: %d\n", ret);
return -EINVAL;
}
/* Check count is within bounds */
if (count > SDW_MAX_LINKS) {
dev_err(&adev->dev, "Link count %d exceeds max %d\n",
count, SDW_MAX_LINKS);
return -EINVAL;
}
if (!count) {
dev_warn(&adev->dev, "No SoundWire links detected\n");
return -EINVAL;
}
dev_dbg(&adev->dev, "ACPI reports %d SDW Link devices\n", count);
info->count = count;
info->link_mask = 0;
for (i = 0; i < count; i++) {
if (ctrl_link_mask && !(ctrl_link_mask & BIT(i))) {
dev_dbg(&adev->dev,
"Link %d masked, will not be enabled\n", i);
continue;
}
if (!is_link_enabled(acpi_fwnode_handle(adev), i)) {
dev_dbg(&adev->dev,
"Link %d not selected in firmware\n", i);
continue;
}
info->link_mask |= BIT(i);
}
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 platform_device_info pdevinfo;
struct platform_device *pdev;
struct sdw_intel_link_res *link;
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);
ctx = devm_kzalloc(&adev->dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return NULL;
ctx->count = count;
ctx->links = devm_kcalloc(&adev->dev, ctx->count,
sizeof(*ctx->links), GFP_KERNEL);
if (!ctx->links)
return NULL;
ctx->count = count;
ctx->mmio_base = res->mmio_base;
ctx->link_mask = res->link_mask;
ctx->handle = res->handle;
mutex_init(&ctx->shim_lock);
link = ctx->links;
link_mask = ctx->link_mask;
INIT_LIST_HEAD(&ctx->link_list);
/* Create SDW Master devices */
for (i = 0; i < count; i++, link++) {
if (!(link_mask & BIT(i))) {
dev_dbg(&adev->dev,
"Link %d masked, will not be enabled\n", i);
continue;
}
link->mmio_base = res->mmio_base;
link->registers = res->mmio_base + SDW_LINK_BASE
+ (SDW_LINK_SIZE * i);
link->shim = res->mmio_base + SDW_SHIM_BASE;
link->alh = res->mmio_base + SDW_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 = link_mask;
memset(&pdevinfo, 0, sizeof(pdevinfo));
pdevinfo.parent = res->parent;
pdevinfo.name = "intel-sdw";
pdevinfo.id = i;
pdevinfo.fwnode = acpi_fwnode_handle(adev);
pdevinfo.data = link;
pdevinfo.size_data = sizeof(*link);
pdev = platform_device_register_full(&pdevinfo);
if (IS_ERR(pdev)) {
dev_err(&adev->dev,
"platform device creation failed: %ld\n",
PTR_ERR(pdev));
goto err;
}
link->pdev = pdev;
link->cdns = platform_get_drvdata(pdev);
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 = devm_kcalloc(&adev->dev, 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:
ctx->count = i;
sdw_intel_cleanup(ctx);
return NULL;
}
static int
sdw_intel_startup_controller(struct sdw_intel_ctx *ctx)
{
struct acpi_device *adev;
struct sdw_intel_link_res *link;
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 + SDW_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->links)
return -EINVAL;
link = ctx->links;
link_mask = ctx->link_mask;
/* Startup SDW Master devices */
for (i = 0; i < ctx->count; i++, link++) {
if (!(link_mask & BIT(i)))
continue;
intel_master_startup(link->pdev);
if (!link->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(link->dev);
}
}
return 0;
}
static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level,
void *cdata, void **return_value)
{
struct sdw_intel_acpi_info *info = cdata;
struct acpi_device *adev;
acpi_status status;
u64 adr;
status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
if (ACPI_FAILURE(status))
return AE_OK; /* keep going */
if (acpi_bus_get_device(handle, &adev)) {
pr_err("%s: Couldn't find ACPI handle\n", __func__);
return AE_NOT_FOUND;
}
info->handle = handle;
/*
* On some Intel platforms, multiple children of the HDAS
* device can be found, but only one of them is the SoundWire
* controller. The SNDW device is always exposed with
* Name(_ADR, 0x40000000), with bits 31..28 representing the
* SoundWire link so filter accordingly
*/
if (FIELD_GET(GENMASK(31, 28), adr) != SDW_LINK_TYPE)
return AE_OK; /* keep going */
/* device found, stop namespace walk */
return AE_CTRL_TERMINATE;
}
/**
* sdw_intel_acpi_scan() - SoundWire Intel init routine
* @parent_handle: ACPI parent handle
* @info: description of what firmware/DSDT tables expose
*
* This scans the namespace and queries firmware to figure out which
* links to enable. A follow-up use of sdw_intel_probe() and
* sdw_intel_startup() is required for creation of devices and bus
* startup
*/
int sdw_intel_acpi_scan(acpi_handle *parent_handle,
struct sdw_intel_acpi_info *info)
{
acpi_status status;
status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
parent_handle, 1,
sdw_intel_acpi_cb,
NULL, info, NULL);
if (ACPI_FAILURE(status))
return -ENODEV;
return sdw_intel_scan_controller(info);
}
EXPORT_SYMBOL_NS(sdw_intel_acpi_scan, SOUNDWIRE_INTEL_INIT);
/**
* sdw_intel_probe() - SoundWire Intel probe routine
* @res: resource data
*
* This registers a platform device for each Master handled by the controller,
* and SoundWire Master and Slave devices will be created by the platform
* 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
*/
void sdw_intel_exit(struct sdw_intel_ctx *ctx)
{
sdw_intel_cleanup(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_res *link;
u32 link_mask;
int i;
if (!ctx->links)
return;
link = ctx->links;
link_mask = ctx->link_mask;
/* Startup SDW Master devices */
for (i = 0; i < ctx->count; i++, link++) {
if (!(link_mask & BIT(i)))
continue;
intel_master_process_wakeen_event(link->pdev);
}
}
EXPORT_SYMBOL_NS(sdw_intel_process_wakeen_event, SOUNDWIRE_INTEL_INIT);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Intel Soundwire Init Library");
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