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Subject[PATCH v4 09/15] soundwire: intel: remove platform devices and provide new interface
Date
Use sdw_master_device and driver instead of platform devices

To quote GregKH:

"Don't mess with a platform device unless you really have no other
possible choice. And even then, don't do it and try to do something
else. Platform devices are really abused, don't perpetuate it "

In addition, rather than a plain-vanilla init/exit, this patch
provides 3 steps in the initialization (ACPI scan, probe, startup)
which make it easier to verify support and allocate required resources
as early as possible, and conversely help make the startup
lighter-weight with only hardware register setup.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
drivers/soundwire/intel.c | 92 ++++++-----
drivers/soundwire/intel.h | 8 +-
drivers/soundwire/intel_init.c | 275 ++++++++++++++++++++++++---------
3 files changed, 268 insertions(+), 107 deletions(-)

diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 64f97bb1a135..ba3bc410d816 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -92,8 +92,6 @@
#define SDW_ALH_STRMZCFG_DMAT GENMASK(7, 0)
#define SDW_ALH_STRMZCFG_CHN GENMASK(19, 16)

-#define SDW_INTEL_QUIRK_MASK_BUS_DISABLE BIT(1)
-
enum intel_pdi_type {
INTEL_PDI_IN = 0,
INTEL_PDI_OUT = 1,
@@ -923,24 +921,23 @@ static int intel_init(struct sdw_intel *sdw)
/*
* probe and init
*/
-static int intel_probe(struct platform_device *pdev)
+static int intel_master_probe(struct sdw_master_device *md, void *link_ctx)
{
- struct sdw_cdns_stream_config config;
struct sdw_intel *sdw;
int ret;

- sdw = devm_kzalloc(&pdev->dev, sizeof(*sdw), GFP_KERNEL);
+ sdw = devm_kzalloc(&md->dev, sizeof(*sdw), GFP_KERNEL);
if (!sdw)
return -ENOMEM;

- sdw->instance = pdev->id;
- sdw->link_res = dev_get_platdata(&pdev->dev);
- sdw->cdns.dev = &pdev->dev;
+ sdw->instance = md->link_id;
+ sdw->link_res = link_ctx;
+ sdw->cdns.dev = &md->dev;
sdw->cdns.registers = sdw->link_res->registers;
- sdw->cdns.instance = sdw->instance;
+ sdw->cdns.instance = md->link_id;
sdw->cdns.msg_count = 0;
- sdw->cdns.bus.dev = &pdev->dev;
- sdw->cdns.bus.link_id = pdev->id;
+ sdw->cdns.bus.dev = &md->dev;
+ sdw->cdns.bus.link_id = md->link_id;

sdw_cdns_probe(&sdw->cdns);

@@ -948,16 +945,50 @@ static int intel_probe(struct platform_device *pdev)
sdw_intel_ops.read_prop = intel_prop_read;
sdw->cdns.bus.ops = &sdw_intel_ops;

- platform_set_drvdata(pdev, sdw);
+ md->pdata = sdw;
+
+ /* set driver data, accessed by snd_soc_dai_set_drvdata() */
+ dev_set_drvdata(&md->dev, &sdw->cdns);

ret = sdw_add_bus_master(&sdw->cdns.bus);
if (ret) {
- dev_err(&pdev->dev, "sdw_add_bus_master fail: %d\n", ret);
+ dev_err(&md->dev, "sdw_add_bus_master fail: %d\n", ret);
return ret;
}

if (sdw->cdns.bus.prop.hw_disabled) {
- dev_info(&pdev->dev, "SoundWire master %d is disabled, ignoring\n",
+ dev_info(&md->dev, "SoundWire master %d is disabled, ignoring\n",
+ sdw->cdns.bus.link_id);
+ return 0;
+ }
+
+ /* Acquire IRQ */
+ ret = request_threaded_irq(sdw->link_res->irq,
+ sdw_cdns_irq, sdw_cdns_thread,
+ IRQF_SHARED, KBUILD_MODNAME, &sdw->cdns);
+ if (ret < 0) {
+ dev_err(sdw->cdns.dev, "unable to grab IRQ %d, disabling device\n",
+ sdw->link_res->irq);
+ goto err_init;
+ }
+
+ return 0;
+
+err_init:
+ sdw_delete_bus_master(&sdw->cdns.bus);
+ return ret;
+}
+
+static int intel_master_startup(struct sdw_master_device *md)
+{
+ struct sdw_cdns_stream_config config;
+ struct sdw_intel *sdw;
+ int ret;
+
+ sdw = md->pdata;
+
+ if (sdw->cdns.bus.prop.hw_disabled) {
+ dev_info(&md->dev, "SoundWire master %d is disabled, ignoring\n",
sdw->cdns.bus.link_id);
return 0;
}
@@ -975,16 +1006,6 @@ static int intel_probe(struct platform_device *pdev)

intel_pdi_ch_update(sdw);

- /* Acquire IRQ */
- ret = request_threaded_irq(sdw->link_res->irq,
- sdw_cdns_irq, sdw_cdns_thread,
- IRQF_SHARED, KBUILD_MODNAME, &sdw->cdns);
- if (ret < 0) {
- dev_err(sdw->cdns.dev, "unable to grab IRQ %d, disabling device\n",
- sdw->link_res->irq);
- goto err_init;
- }
-
ret = sdw_cdns_enable_interrupt(&sdw->cdns, true);
if (ret < 0) {
dev_err(sdw->cdns.dev, "cannot enable interrupts\n");
@@ -1011,17 +1032,17 @@ static int intel_probe(struct platform_device *pdev)

err_interrupt:
sdw_cdns_enable_interrupt(&sdw->cdns, false);
- free_irq(sdw->link_res->irq, sdw);
err_init:
+ free_irq(sdw->link_res->irq, sdw);
sdw_delete_bus_master(&sdw->cdns.bus);
return ret;
}

-static int intel_remove(struct platform_device *pdev)
+static int intel_master_remove(struct sdw_master_device *md)
{
struct sdw_intel *sdw;

- sdw = platform_get_drvdata(pdev);
+ sdw = md->pdata;

if (!sdw->cdns.bus.prop.hw_disabled) {
intel_debugfs_exit(sdw);
@@ -1031,19 +1052,18 @@ static int intel_remove(struct platform_device *pdev)
}
sdw_delete_bus_master(&sdw->cdns.bus);

+ md->dev.driver = NULL;
+ device_unregister(&md->dev);
+
return 0;
}

-static struct platform_driver sdw_intel_drv = {
- .probe = intel_probe,
- .remove = intel_remove,
- .driver = {
- .name = "int-sdw",
-
- },
+struct sdw_md_driver intel_sdw_driver = {
+ .probe = intel_master_probe,
+ .startup = intel_master_startup,
+ .remove = intel_master_remove,
};
-
-module_platform_driver(sdw_intel_drv);
+EXPORT_SYMBOL(intel_sdw_driver);

MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS("platform:int-sdw");
diff --git a/drivers/soundwire/intel.h b/drivers/soundwire/intel.h
index 38b7c125fb10..cfab2f00214d 100644
--- a/drivers/soundwire/intel.h
+++ b/drivers/soundwire/intel.h
@@ -7,7 +7,7 @@
/**
* struct sdw_intel_link_res - Soundwire Intel link resource structure,
* typically populated by the controller driver.
- * @pdev: platform_device
+ * @md: master device
* @mmio_base: mmio base of SoundWire registers
* @registers: Link IO registers base
* @shim: Audio shim pointer
@@ -17,7 +17,7 @@
* @dev: device implementing hw_params and free callbacks
*/
struct sdw_intel_link_res {
- struct platform_device *pdev;
+ struct sdw_master_device *md;
void __iomem *mmio_base; /* not strictly needed, useful for debug */
void __iomem *registers;
void __iomem *shim;
@@ -27,4 +27,8 @@ struct sdw_intel_link_res {
struct device *dev;
};

+#define SDW_INTEL_QUIRK_MASK_BUS_DISABLE BIT(1)
+
+extern struct sdw_md_driver intel_sdw_driver;
+
#endif /* __SDW_INTEL_LOCAL_H */
diff --git a/drivers/soundwire/intel_init.c b/drivers/soundwire/intel_init.c
index 4b769409f6f8..42f7ae034bea 100644
--- a/drivers/soundwire/intel_init.c
+++ b/drivers/soundwire/intel_init.c
@@ -11,7 +11,7 @@
#include <linux/export.h>
#include <linux/io.h>
#include <linux/module.h>
-#include <linux/platform_device.h>
+#include <linux/soundwire/sdw.h>
#include <linux/soundwire/sdw_intel.h>
#include "intel.h"

@@ -23,22 +23,47 @@
#define SDW_LINK_BASE 0x30000
#define SDW_LINK_SIZE 0x10000

-static int link_mask;
-module_param_named(sdw_link_mask, link_mask, int, 0444);
+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 int sdw_intel_cleanup_pdev(struct sdw_intel_ctx *ctx)
+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;
+ struct sdw_master_device *md;
int i;

if (!link)
return 0;

- for (i = 0; i < ctx->count; i++) {
- if (link->pdev)
- platform_device_unregister(link->pdev);
- link++;
+ for (i = 0; i < ctx->count; i++, link++) {
+ md = link->md;
+ if (md)
+ md->driver->remove(md);
}

kfree(ctx->links);
@@ -47,112 +72,194 @@ static int sdw_intel_cleanup_pdev(struct sdw_intel_ctx *ctx)
return 0;
}

-static struct sdw_intel_ctx
-*sdw_intel_add_controller(struct sdw_intel_res *res)
+static int
+sdw_intel_scan_controller(struct sdw_intel_acpi_info *info)
{
- struct platform_device_info pdevinfo;
- struct platform_device *pdev;
- struct sdw_intel_link_res *link;
- struct sdw_intel_ctx *ctx;
struct acpi_device *adev;
int ret, i;
u8 count;
- u32 caps;

- if (acpi_bus_get_device(res->handle, &adev))
- return NULL;
+ 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);

- /* Don't fail on error, continue and use hw value */
+ /*
+ * 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);
- count = SDW_MAX_LINKS;
+ return -EINVAL;
}

- /* Check SNDWLCAP.LCOUNT */
- caps = ioread32(res->mmio_base + SDW_SHIM_BASE + SDW_SHIM_LCAP);
- caps &= GENMASK(2, 0);
-
- /* Check HW supported vs property value and use min of two */
- count = min_t(u8, caps, count);
-
/* 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 NULL;
+ return -EINVAL;
} else if (!count) {
dev_warn(&adev->dev, "No SoundWire links detected\n");
- return NULL;
+ return -EINVAL;
}
+ dev_dbg(&adev->dev, "ACPI reports %d SDW Link devices\n", count);
+
+ info->count = count;

+ 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;
+}
+
+static struct sdw_intel_ctx
+*sdw_intel_probe_controller(struct sdw_intel_res *res)
+{
+ struct sdw_intel_link_res *link;
+ struct sdw_intel_ctx *ctx;
+ struct acpi_device *adev;
+ struct sdw_master_device *md;
+ u32 link_mask;
+ 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 = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return NULL;

- ctx->count = count;
- ctx->links = kcalloc(ctx->count, sizeof(*ctx->links), GFP_KERNEL);
+ ctx->links = kcalloc(count, sizeof(*ctx->links), GFP_KERNEL);
if (!ctx->links)
goto link_err;

+ ctx->count = count;
+ ctx->mmio_base = res->mmio_base;
+ ctx->link_mask = res->link_mask;
+ ctx->handle = res->handle;
+
link = ctx->links;
+ link_mask = ctx->link_mask;

/* Create SDW Master devices */
- for (i = 0; i < count; i++) {
- if (link_mask && !(link_mask & BIT(i))) {
- dev_dbg(&adev->dev,
- "Link %d masked, will not be enabled\n", i);
- link++;
+ for (i = 0; i < count; i++, link++) {
+ if (link_mask && !(link_mask & BIT(i)))
continue;
- }

+ md = sdw_md_add(&intel_sdw_driver,
+ res->parent,
+ acpi_fwnode_handle(adev),
+ i);
+
+ if (IS_ERR(md)) {
+ dev_err(&adev->dev, "Could not create link %d\n", i);
+ goto err;
+ }
+ link->md = md;
+ link->mmio_base = res->mmio_base;
link->registers = res->mmio_base + SDW_LINK_BASE
- + (SDW_LINK_SIZE * i);
+ + (SDW_LINK_SIZE * i);
link->shim = res->mmio_base + SDW_SHIM_BASE;
link->alh = res->mmio_base + SDW_ALH_BASE;
-
+ link->irq = res->irq;
link->ops = res->ops;
link->dev = res->dev;

- memset(&pdevinfo, 0, sizeof(pdevinfo));
-
- pdevinfo.parent = res->parent;
- pdevinfo.name = "int-sdw";
- pdevinfo.id = i;
- pdevinfo.fwnode = acpi_fwnode_handle(adev);
-
- pdev = platform_device_register_full(&pdevinfo);
- if (IS_ERR(pdev)) {
- dev_err(&adev->dev,
- "platform device creation failed: %ld\n",
- PTR_ERR(pdev));
- goto pdev_err;
- }
-
- link->pdev = pdev;
- link++;
+ /* let the SoundWire master driver to its probe */
+ md->driver->probe(md, link);
}

return ctx;

-pdev_err:
- sdw_intel_cleanup_pdev(ctx);
+err:
+ sdw_intel_cleanup(ctx);
link_err:
kfree(ctx);
return NULL;
}

+static int
+sdw_intel_startup_controller(struct sdw_intel_ctx *ctx)
+{
+ struct acpi_device *adev;
+ struct sdw_intel_link_res *link;
+ struct sdw_master_device *md;
+ 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;
+
+ /* Create SDW Master devices */
+ for (i = 0; i < ctx->count; i++, link++) {
+ if (link_mask && !(link_mask & BIT(i)))
+ continue;
+
+ md = link->md;
+
+ md->driver->startup(md);
+ }
+
+ return 0;
+}
+
static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level,
void *cdata, void **return_value)
{
- struct sdw_intel_res *res = cdata;
+ struct sdw_intel_acpi_info *info = cdata;
struct acpi_device *adev;
acpi_status status;
u64 adr;
@@ -166,7 +273,7 @@ static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level,
return AE_NOT_FOUND;
}

- res->handle = handle;
+ info->handle = handle;

/*
* On some Intel platforms, multiple children of the HDAS
@@ -183,36 +290,66 @@ static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level,
}

/**
- * sdw_intel_init() - SoundWire Intel init routine
+ * sdw_intel_acpi_scan() - SoundWire Intel init routine
* @parent_handle: ACPI parent handle
- * @res: resource data
+ * @info: description of what firmware/DSDT tables expose
*
- * This scans the namespace and creates SoundWire link controller devices
- * based on the info queried.
+ * 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
*/
-void *sdw_intel_init(acpi_handle *parent_handle, struct sdw_intel_res *res)
+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, res, NULL);
+ NULL, info, NULL);
if (ACPI_FAILURE(status))
- return NULL;
+ return -ENODEV;

- return sdw_intel_add_controller(res);
+ return sdw_intel_scan_controller(info);
}
+EXPORT_SYMBOL(sdw_intel_acpi_scan);

+/**
+ * sdw_intel_probe() - SoundWire Intel probe routine
+ * @parent_handle: ACPI parent handle
+ * @res: resource data
+ *
+ * This creates SoundWire Master and Slave devices below the controller.
+ * All the information necessary is stored in the context, and the res
+ * argument pointer can be freed after this step.
+ */
+struct sdw_intel_ctx
+*sdw_intel_probe(struct sdw_intel_res *res)
+{
+ return sdw_intel_probe_controller(res);
+}
+EXPORT_SYMBOL(sdw_intel_probe);
+
+/**
+ * sdw_intel_startup() - SoundWire Intel startup
+ * @ctx: SoundWire context allocated in the probe
+ *
+ */
+int sdw_intel_startup(struct sdw_intel_ctx *ctx)
+{
+ return sdw_intel_startup_controller(ctx);
+}
+EXPORT_SYMBOL(sdw_intel_startup);
/**
* sdw_intel_exit() - SoundWire Intel exit
- * @arg: callback context
+ * @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_pdev(ctx);
+ sdw_intel_cleanup(ctx);
kfree(ctx);
}
EXPORT_SYMBOL(sdw_intel_exit);
--
2.20.1
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