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>

1 files changed, 24 insertions, 27 deletions

diff --git a/include/linux/rio.h b/include/linux/rio.h
index 18e099342e6f..fcd492e7aff4 100644
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -94,6 +94,23 @@ union rio_pw_msg;
  * @switchid: Switch ID that is unique across a network
  * @route_table: Copy of switch routing table
  * @port_ok: Status of each port (one bit per port) - OK=1 or UNINIT=0
+ * @ops: pointer to switch-specific operations
+ * @lock: lock to serialize operations updates
+ * @nextdev: Array of per-port pointers to the next attached device
+ */
+struct rio_switch {
+        struct list_head node;
+        u16 switchid;
+        u8 *route_table;
+        u32 port_ok;
+        struct rio_switch_ops *ops;
+        spinlock_t lock;
+        struct rio_dev *nextdev[0];
+};
+
+/**
+ * struct rio_switch_ops - Per-switch operations
+ * @owner: The module owner of this structure
  * @add_entry: Callback for switch-specific route add function
  * @get_entry: Callback for switch-specific route get function
  * @clr_table: Callback for switch-specific clear route table function
@@ -101,14 +118,12 @@ union rio_pw_msg;
  * @get_domain: Callback for switch-specific domain get function
  * @em_init: Callback for switch-specific error management init function
  * @em_handle: Callback for switch-specific error management handler function
- * @sw_sysfs: Callback that initializes switch-specific sysfs attributes
- * @nextdev: Array of per-port pointers to the next attached device
+ *
+ * Defines the operations that are necessary to initialize/control
+ * a particular RIO switch device.
  */
-struct rio_switch {
-        struct list_head node;
-        u16 switchid;
-        u8 *route_table;
-        u32 port_ok;
+struct rio_switch_ops {
+        struct module *owner;
         int (*add_entry) (struct rio_mport *mport, u16 destid, u8 hopcount,
                           u16 table, u16 route_destid, u8 route_port);
         int (*get_entry) (struct rio_mport *mport, u16 destid, u8 hopcount,
@@ -121,8 +136,6 @@ struct rio_switch {
                            u8 *sw_domain);
         int (*em_init) (struct rio_dev *dev);
         int (*em_handle) (struct rio_dev *dev, u8 swport);
-        int (*sw_sysfs) (struct rio_dev *dev, int create);
-        struct rio_dev *nextdev[0];
 };
 
 /**
@@ -130,6 +143,7 @@ struct rio_switch {
  * @global_list: Node in list of all RIO devices
  * @net_list: Node in list of RIO devices in a network
  * @net: Network this device is a part of
+ * @do_enum: Enumeration flag
  * @did: Device ID
  * @vid: Vendor ID
  * @device_rev: Device revision
@@ -158,6 +172,7 @@ struct rio_dev {
         struct list_head global_list;   /* node in list of all RIO devices */
         struct list_head net_list;      /* node in per net list */
         struct rio_net *net;    /* RIO net this device resides in */
+        bool do_enum;
         u16 did;
         u16 vid;
         u32 device_rev;
@@ -297,10 +312,6 @@ struct rio_net {
         struct rio_id_table destid_table;  /* destID allocation table */
 };
 
-/* Definitions used by switch sysfs initialization callback */
-#define RIO_SW_SYSFS_CREATE     1       /* Create switch attributes */
-#define RIO_SW_SYSFS_REMOVE     0       /* Remove switch attributes */
-
 /* Low-level architecture-dependent routines */
 
 /**
@@ -400,20 +411,6 @@ struct rio_device_id {
         u16 asm_did, asm_vid;
 };
 
-/**
- * struct rio_switch_ops - Per-switch operations
- * @vid: RIO vendor ID
- * @did: RIO device ID
- * @init_hook: Callback that performs switch device initialization
- *
- * Defines the operations that are necessary to initialize/control
- * a particular RIO switch device.
- */
-struct rio_switch_ops {
-        u16 vid, did;
-        int (*init_hook) (struct rio_dev *rdev, int do_enum);
-};
-
 union rio_pw_msg {
         struct {
                 u32 comptag;    /* Component Tag CSR */