rapidio: convert switch drivers to modules
Rework RapidIO switch drivers to add an option to build them as loadable
kernel modules.
This patch removes RapidIO-specific vmlinux section and converts switch
drivers to be compatible with LDM driver registration method. To simplify
registration of device-specific callback routines this patch introduces
rio_switch_ops data structure. The sw_sysfs() callback is removed from
the list of device-specific operations because under the new structure its
functions can be handled by switch driver's probe() and remove() routines.
If a specific switch device driver is not loaded the RapidIO subsystem
core will use default standard-based operations to configure a switch.
Because the current implementation of RapidIO enumeration/discovery method
relies on availability of device-specific operations for error management,
switch device drivers must be loaded before the RapidIO
enumeration/discovery starts.
This patch also moves several common routines from enumeration/discovery
module into the RapidIO core code to make switch-specific operations
accessible to all components of RapidIO subsystem.
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@Prodrive.nl>
Cc: Micha Nelissen <micha.nelissen@Prodrive.nl>
Cc: Stef van Os <stef.van.os@Prodrive.nl>
Cc: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/rapidio/switches/idt_gen2.c b/drivers/rapidio/switches/idt_gen2.c
index 809b7a3..00a71eb 100644
--- a/drivers/rapidio/switches/idt_gen2.c
+++ b/drivers/rapidio/switches/idt_gen2.c
@@ -11,6 +11,7 @@
*/
#include <linux/stat.h>
+#include <linux/module.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/rio_ids.h>
@@ -387,12 +388,12 @@
static DEVICE_ATTR(errlog, S_IRUGO, idtg2_show_errlog, NULL);
-static int idtg2_sysfs(struct rio_dev *rdev, int create)
+static int idtg2_sysfs(struct rio_dev *rdev, bool create)
{
struct device *dev = &rdev->dev;
int err = 0;
- if (create == RIO_SW_SYSFS_CREATE) {
+ if (create) {
/* Initialize sysfs entries */
err = device_create_file(dev, &dev_attr_errlog);
if (err)
@@ -403,29 +404,90 @@
return err;
}
-static int idtg2_switch_init(struct rio_dev *rdev, int do_enum)
+static struct rio_switch_ops idtg2_switch_ops = {
+ .owner = THIS_MODULE,
+ .add_entry = idtg2_route_add_entry,
+ .get_entry = idtg2_route_get_entry,
+ .clr_table = idtg2_route_clr_table,
+ .set_domain = idtg2_set_domain,
+ .get_domain = idtg2_get_domain,
+ .em_init = idtg2_em_init,
+ .em_handle = idtg2_em_handler,
+};
+
+static int idtg2_probe(struct rio_dev *rdev, const struct rio_device_id *id)
{
pr_debug("RIO: %s for %s\n", __func__, rio_name(rdev));
- rdev->rswitch->add_entry = idtg2_route_add_entry;
- rdev->rswitch->get_entry = idtg2_route_get_entry;
- rdev->rswitch->clr_table = idtg2_route_clr_table;
- rdev->rswitch->set_domain = idtg2_set_domain;
- rdev->rswitch->get_domain = idtg2_get_domain;
- rdev->rswitch->em_init = idtg2_em_init;
- rdev->rswitch->em_handle = idtg2_em_handler;
- rdev->rswitch->sw_sysfs = idtg2_sysfs;
- if (do_enum) {
+ spin_lock(&rdev->rswitch->lock);
+
+ if (rdev->rswitch->ops) {
+ spin_unlock(&rdev->rswitch->lock);
+ return -EINVAL;
+ }
+
+ rdev->rswitch->ops = &idtg2_switch_ops;
+
+ if (rdev->do_enum) {
/* Ensure that default routing is disabled on startup */
rio_write_config_32(rdev,
RIO_STD_RTE_DEFAULT_PORT, IDT_NO_ROUTE);
}
+ /* Create device-specific sysfs attributes */
+ idtg2_sysfs(rdev, true);
+
+ spin_unlock(&rdev->rswitch->lock);
return 0;
}
-DECLARE_RIO_SWITCH_INIT(RIO_VID_IDT, RIO_DID_IDTCPS1848, idtg2_switch_init);
-DECLARE_RIO_SWITCH_INIT(RIO_VID_IDT, RIO_DID_IDTCPS1616, idtg2_switch_init);
-DECLARE_RIO_SWITCH_INIT(RIO_VID_IDT, RIO_DID_IDTVPS1616, idtg2_switch_init);
-DECLARE_RIO_SWITCH_INIT(RIO_VID_IDT, RIO_DID_IDTSPS1616, idtg2_switch_init);
-DECLARE_RIO_SWITCH_INIT(RIO_VID_IDT, RIO_DID_IDTCPS1432, idtg2_switch_init);
+static void idtg2_remove(struct rio_dev *rdev)
+{
+ pr_debug("RIO: %s for %s\n", __func__, rio_name(rdev));
+ spin_lock(&rdev->rswitch->lock);
+ if (rdev->rswitch->ops != &idtg2_switch_ops) {
+ spin_unlock(&rdev->rswitch->lock);
+ return;
+ }
+ rdev->rswitch->ops = NULL;
+
+ /* Remove device-specific sysfs attributes */
+ idtg2_sysfs(rdev, false);
+
+ spin_unlock(&rdev->rswitch->lock);
+}
+
+static struct rio_device_id idtg2_id_table[] = {
+ {RIO_DEVICE(RIO_DID_IDTCPS1848, RIO_VID_IDT)},
+ {RIO_DEVICE(RIO_DID_IDTCPS1616, RIO_VID_IDT)},
+ {RIO_DEVICE(RIO_DID_IDTVPS1616, RIO_VID_IDT)},
+ {RIO_DEVICE(RIO_DID_IDTSPS1616, RIO_VID_IDT)},
+ {RIO_DEVICE(RIO_DID_IDTCPS1432, RIO_VID_IDT)},
+ { 0, } /* terminate list */
+};
+
+static struct rio_driver idtg2_driver = {
+ .name = "idt_gen2",
+ .id_table = idtg2_id_table,
+ .probe = idtg2_probe,
+ .remove = idtg2_remove,
+};
+
+static int __init idtg2_init(void)
+{
+ return rio_register_driver(&idtg2_driver);
+}
+
+static void __exit idtg2_exit(void)
+{
+ pr_debug("RIO: %s\n", __func__);
+ rio_unregister_driver(&idtg2_driver);
+ pr_debug("RIO: %s done\n", __func__);
+}
+
+device_initcall(idtg2_init);
+module_exit(idtg2_exit);
+
+MODULE_DESCRIPTION("IDT CPS Gen.2 Serial RapidIO switch family driver");
+MODULE_AUTHOR("Integrated Device Technology, Inc.");
+MODULE_LICENSE("GPL");