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authorLinus Torvalds <torvalds@linux-foundation.org>2012-03-21 10:32:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-21 10:32:00 -0700
commit5f0e685f316a1de6d3af8b23eaf46651faca32ab (patch)
treeaf1ed231b7fcfc65b146be59a0aee699aa9f6353 /include
parentf8974cb71310a05632aada76be6a27576d61e609 (diff)
parent87bf5ab82884c829366914aaa813cc8b07b9fe58 (diff)
Merge tag 'spi-for-linus' of git://git.secretlab.ca/git/linux-2.6
Pull SPI changes for v3.4 from Grant Likely: "Mostly a bunch of new drivers and driver bug fixes; but this also includes a few patches that create a core message queue infrastructure for the spi subsystem instead of making each driver open code it." * tag 'spi-for-linus' of git://git.secretlab.ca/git/linux-2.6: (34 commits) spi/fsl-espi: Make sure pm is within 2..32 spi/fsl-espi: make the clock computation easier to read spi: sh-hspi: modify write/read method spi: sh-hspi: control spi clock more correctly spi: sh-hspi: convert to using core message queue spi: s3c64xx: Fix build spi: s3c64xx: remove unnecessary callback msg->complete spi: remove redundant variable assignment spi: release lock on error path in spi_pump_messages() spi: Compatibility with direction which is used in samsung DMA operation spi-topcliff-pch: add recovery processing in case wait-event timeout spi-topcliff-pch: supports a spi mode setup and bit order setup by IO control spi-topcliff-pch: Fix issue for transmitting over 4KByte spi-topcliff-pch: Modify pci-bus number dynamically to get DMA device info spi/imx: simplify error handling to free gpios spi: Convert to DEFINE_PCI_DEVICE_TABLE spi: add Broadcom BCM63xx SPI controller driver SPI: add CSR SiRFprimaII SPI controller driver spi-topcliff-pch: fix -Wuninitialized warning spi: Mark spi_register_board_info() __devinit ...
Diffstat (limited to 'include')
-rw-r--r--include/linux/amba/pl022.h3
-rw-r--r--include/linux/spi/sh_hspi.h23
-rw-r--r--include/linux/spi/spi.h53
3 files changed, 78 insertions, 1 deletions
diff --git a/include/linux/amba/pl022.h b/include/linux/amba/pl022.h
index 572f637299c9..3672f40f3455 100644
--- a/include/linux/amba/pl022.h
+++ b/include/linux/amba/pl022.h
@@ -241,6 +241,8 @@ struct dma_chan;
* @autosuspend_delay: delay in ms following transfer completion before the
* runtime power management system suspends the device. A setting of 0
* indicates no delay and the device will be suspended immediately.
+ * @rt: indicates the controller should run the message pump with realtime
+ * priority to minimise the transfer latency on the bus.
*/
struct pl022_ssp_controller {
u16 bus_id;
@@ -250,6 +252,7 @@ struct pl022_ssp_controller {
void *dma_rx_param;
void *dma_tx_param;
int autosuspend_delay;
+ bool rt;
};
/**
diff --git a/include/linux/spi/sh_hspi.h b/include/linux/spi/sh_hspi.h
new file mode 100644
index 000000000000..a1121f872ac1
--- /dev/null
+++ b/include/linux/spi/sh_hspi.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2011 Kuninori Morimoto
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#ifndef SH_HSPI_H
+#define SH_HSPI_H
+
+struct sh_hspi_info {
+};
+
+#endif
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 176fce9cc6b1..98679b061b63 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -22,6 +22,7 @@
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
+#include <linux/kthread.h>
/*
* INTERFACES between SPI master-side drivers and SPI infrastructure.
@@ -235,6 +236,27 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
* the device whose settings are being modified.
* @transfer: adds a message to the controller's transfer queue.
* @cleanup: frees controller-specific state
+ * @queued: whether this master is providing an internal message queue
+ * @kworker: thread struct for message pump
+ * @kworker_task: pointer to task for message pump kworker thread
+ * @pump_messages: work struct for scheduling work to the message pump
+ * @queue_lock: spinlock to syncronise access to message queue
+ * @queue: message queue
+ * @cur_msg: the currently in-flight message
+ * @busy: message pump is busy
+ * @running: message pump is running
+ * @rt: whether this queue is set to run as a realtime task
+ * @prepare_transfer_hardware: a message will soon arrive from the queue
+ * so the subsystem requests the driver to prepare the transfer hardware
+ * by issuing this call
+ * @transfer_one_message: the subsystem calls the driver to transfer a single
+ * message while queuing transfers that arrive in the meantime. When the
+ * driver is finished with this message, it must call
+ * spi_finalize_current_message() so the subsystem can issue the next
+ * transfer
+ * @prepare_transfer_hardware: there are currently no more messages on the
+ * queue so the subsystem notifies the driver that it may relax the
+ * hardware by issuing this call
*
* Each SPI master controller can communicate with one or more @spi_device
* children. These make a small bus, sharing MOSI, MISO and SCK signals
@@ -318,6 +340,28 @@ struct spi_master {
/* called on release() to free memory provided by spi_master */
void (*cleanup)(struct spi_device *spi);
+
+ /*
+ * These hooks are for drivers that want to use the generic
+ * master transfer queueing mechanism. If these are used, the
+ * transfer() function above must NOT be specified by the driver.
+ * Over time we expect SPI drivers to be phased over to this API.
+ */
+ bool queued;
+ struct kthread_worker kworker;
+ struct task_struct *kworker_task;
+ struct kthread_work pump_messages;
+ spinlock_t queue_lock;
+ struct list_head queue;
+ struct spi_message *cur_msg;
+ bool busy;
+ bool running;
+ bool rt;
+
+ int (*prepare_transfer_hardware)(struct spi_master *master);
+ int (*transfer_one_message)(struct spi_master *master,
+ struct spi_message *mesg);
+ int (*unprepare_transfer_hardware)(struct spi_master *master);
};
static inline void *spi_master_get_devdata(struct spi_master *master)
@@ -343,6 +387,13 @@ static inline void spi_master_put(struct spi_master *master)
put_device(&master->dev);
}
+/* PM calls that need to be issued by the driver */
+extern int spi_master_suspend(struct spi_master *master);
+extern int spi_master_resume(struct spi_master *master);
+
+/* Calls the driver make to interact with the message queue */
+extern struct spi_message *spi_get_next_queued_message(struct spi_master *master);
+extern void spi_finalize_current_message(struct spi_master *master);
/* the spi driver core manages memory for the spi_master classdev */
extern struct spi_master *
@@ -549,7 +600,7 @@ static inline struct spi_message *spi_message_alloc(unsigned ntrans, gfp_t flags
+ ntrans * sizeof(struct spi_transfer),
flags);
if (m) {
- int i;
+ unsigned i;
struct spi_transfer *t = (struct spi_transfer *)(m + 1);
INIT_LIST_HEAD(&m->transfers);