if (spi->dev.of_node)
of_node_clear_flag(spi->dev.of_node, OF_POPULATED);
+ if (ACPI_COMPANION(&spi->dev))
+ acpi_device_clear_enumerated(ACPI_COMPANION(&spi->dev));
device_unregister(&spi->dev);
}
EXPORT_SYMBOL_GPL(spi_unregister_device);
return 0;
}
#else /* !CONFIG_HAS_DMA */
+static inline int spi_map_buf(struct spi_master *master,
+ struct device *dev, struct sg_table *sgt,
+ void *buf, size_t len,
+ enum dma_data_direction dir)
+{
+ return -EINVAL;
+}
+
+static inline void spi_unmap_buf(struct spi_master *master,
+ struct device *dev, struct sg_table *sgt,
+ enum dma_data_direction dir)
+{
+}
+
static inline int __spi_map_msg(struct spi_master *master,
struct spi_message *msg)
{
* __spi_pump_messages - function which processes spi message queue
* @master: master to process queue for
* @in_kthread: true if we are in the context of the message pump thread
- * @bus_locked: true if the bus mutex is held when calling this function
*
* This function checks if there is any spi message in the queue that
* needs processing and if so call out to the driver to initialize hardware
* inside spi_sync(); the queue extraction handling at the top of the
* function should deal with this safely.
*/
-static void __spi_pump_messages(struct spi_master *master, bool in_kthread,
- bool bus_locked)
+static void __spi_pump_messages(struct spi_master *master, bool in_kthread)
{
unsigned long flags;
bool was_busy = false;
master->busy = true;
spin_unlock_irqrestore(&master->queue_lock, flags);
+ mutex_lock(&master->io_mutex);
+
if (!was_busy && master->auto_runtime_pm) {
ret = pm_runtime_get_sync(master->dev.parent);
if (ret < 0) {
}
}
- if (!bus_locked)
- mutex_lock(&master->bus_lock_mutex);
-
trace_spi_message_start(master->cur_msg);
if (master->prepare_message) {
}
out:
- if (!bus_locked)
- mutex_unlock(&master->bus_lock_mutex);
+ mutex_unlock(&master->io_mutex);
/* Prod the scheduler in case transfer_one() was busy waiting */
if (!ret)
struct spi_master *master =
container_of(work, struct spi_master, pump_messages);
- __spi_pump_messages(master, true, master->bus_lock_flag);
+ __spi_pump_messages(master, true);
}
static int spi_init_queue(struct spi_master *master)
return 1;
}
-static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level,
- void *data, void **return_value)
+static acpi_status acpi_register_spi_device(struct spi_master *master,
+ struct acpi_device *adev)
{
- struct spi_master *master = data;
struct list_head resource_list;
- struct acpi_device *adev;
struct spi_device *spi;
int ret;
- if (acpi_bus_get_device(handle, &adev))
- return AE_OK;
- if (acpi_bus_get_status(adev) || !adev->status.present)
+ if (acpi_bus_get_status(adev) || !adev->status.present ||
+ acpi_device_enumerated(adev))
return AE_OK;
spi = spi_alloc_device(master);
if (spi->irq < 0)
spi->irq = acpi_dev_gpio_irq_get(adev, 0);
+ acpi_device_set_enumerated(adev);
+
adev->power.flags.ignore_parent = true;
strlcpy(spi->modalias, acpi_device_hid(adev), sizeof(spi->modalias));
if (spi_add_device(spi)) {
return AE_OK;
}
+static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level,
+ void *data, void **return_value)
+{
+ struct spi_master *master = data;
+ struct acpi_device *adev;
+
+ if (acpi_bus_get_device(handle, &adev))
+ return AE_OK;
+
+ return acpi_register_spi_device(master, adev);
+}
+
static void acpi_register_spi_devices(struct spi_master *master)
{
acpi_status status;
spin_lock_init(&master->queue_lock);
spin_lock_init(&master->bus_lock_spinlock);
mutex_init(&master->bus_lock_mutex);
+ mutex_init(&master->io_mutex);
master->bus_lock_flag = 0;
init_completion(&master->xfer_completion);
if (!master->max_dma_len)
{
struct spi_master *master = spi->master;
+ struct device *rx_dev = NULL;
int ret;
if ((msg->opcode_nbits == SPI_NBITS_DUAL ||
return ret;
}
}
+
mutex_lock(&master->bus_lock_mutex);
+ mutex_lock(&master->io_mutex);
+ if (master->dma_rx) {
+ rx_dev = master->dma_rx->device->dev;
+ ret = spi_map_buf(master, rx_dev, &msg->rx_sg,
+ msg->buf, msg->len,
+ DMA_FROM_DEVICE);
+ if (!ret)
+ msg->cur_msg_mapped = true;
+ }
ret = master->spi_flash_read(spi, msg);
+ if (msg->cur_msg_mapped)
+ spi_unmap_buf(master, rx_dev, &msg->rx_sg,
+ DMA_FROM_DEVICE);
+ mutex_unlock(&master->io_mutex);
mutex_unlock(&master->bus_lock_mutex);
+
if (master->auto_runtime_pm)
pm_runtime_put(master->dev.parent);
complete(arg);
}
-static int __spi_sync(struct spi_device *spi, struct spi_message *message,
- int bus_locked)
+static int __spi_sync(struct spi_device *spi, struct spi_message *message)
{
DECLARE_COMPLETION_ONSTACK(done);
int status;
SPI_STATISTICS_INCREMENT_FIELD(&master->statistics, spi_sync);
SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, spi_sync);
- if (!bus_locked)
- mutex_lock(&master->bus_lock_mutex);
-
/* If we're not using the legacy transfer method then we will
* try to transfer in the calling context so special case.
* This code would be less tricky if we could remove the
status = spi_async_locked(spi, message);
}
- if (!bus_locked)
- mutex_unlock(&master->bus_lock_mutex);
-
if (status == 0) {
/* Push out the messages in the calling context if we
* can.
spi_sync_immediate);
SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics,
spi_sync_immediate);
- __spi_pump_messages(master, false, bus_locked);
+ __spi_pump_messages(master, false);
}
wait_for_completion(&done);
*/
int spi_sync(struct spi_device *spi, struct spi_message *message)
{
- return __spi_sync(spi, message, spi->master->bus_lock_flag);
+ int ret;
+
+ mutex_lock(&spi->master->bus_lock_mutex);
+ ret = __spi_sync(spi, message);
+ mutex_unlock(&spi->master->bus_lock_mutex);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(spi_sync);
*/
int spi_sync_locked(struct spi_device *spi, struct spi_message *message)
{
- return __spi_sync(spi, message, 1);
+ return __spi_sync(spi, message);
}
EXPORT_SYMBOL_GPL(spi_sync_locked);
extern struct notifier_block spi_of_notifier;
#endif /* IS_ENABLED(CONFIG_OF_DYNAMIC) */
+#if IS_ENABLED(CONFIG_ACPI)
+static int spi_acpi_master_match(struct device *dev, const void *data)
+{
+ return ACPI_COMPANION(dev->parent) == data;
+}
+
+static int spi_acpi_device_match(struct device *dev, void *data)
+{
+ return ACPI_COMPANION(dev) == data;
+}
+
+static struct spi_master *acpi_spi_find_master_by_adev(struct acpi_device *adev)
+{
+ struct device *dev;
+
+ dev = class_find_device(&spi_master_class, NULL, adev,
+ spi_acpi_master_match);
+ if (!dev)
+ return NULL;
+
+ return container_of(dev, struct spi_master, dev);
+}
+
+static struct spi_device *acpi_spi_find_device_by_adev(struct acpi_device *adev)
+{
+ struct device *dev;
+
+ dev = bus_find_device(&spi_bus_type, NULL, adev, spi_acpi_device_match);
+
+ return dev ? to_spi_device(dev) : NULL;
+}
+
+static int acpi_spi_notify(struct notifier_block *nb, unsigned long value,
+ void *arg)
+{
+ struct acpi_device *adev = arg;
+ struct spi_master *master;
+ struct spi_device *spi;
+
+ switch (value) {
+ case ACPI_RECONFIG_DEVICE_ADD:
+ master = acpi_spi_find_master_by_adev(adev->parent);
+ if (!master)
+ break;
+
+ acpi_register_spi_device(master, adev);
+ put_device(&master->dev);
+ break;
+ case ACPI_RECONFIG_DEVICE_REMOVE:
+ if (!acpi_device_enumerated(adev))
+ break;
+
+ spi = acpi_spi_find_device_by_adev(adev);
+ if (!spi)
+ break;
+
+ spi_unregister_device(spi);
+ put_device(&spi->dev);
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block spi_acpi_notifier = {
+ .notifier_call = acpi_spi_notify,
+};
+#else
+extern struct notifier_block spi_acpi_notifier;
+#endif
+
static int __init spi_init(void)
{
int status;
if (IS_ENABLED(CONFIG_OF_DYNAMIC))
WARN_ON(of_reconfig_notifier_register(&spi_of_notifier));
+ if (IS_ENABLED(CONFIG_ACPI))
+ WARN_ON(acpi_reconfig_notifier_register(&spi_acpi_notifier));
return 0;
git.samba.org / sfrench / cifs-2.6.git / blobdiff