[PATCH] RapidIO support: core base

Adds a RapidIO subsystem to the kernel.  RIO is a switched fabric interconnect
used in higher-end embedded applications.  The curious can look at the specs
over at http://www.rapidio.org

The core code implements enumeration/discovery, management of
devices/resources, and interfaces for RIO drivers.

There's a lot more to do to take advantages of all the hardware features.
However, this should provide a good base for folks with RIO hardware to start
contributing.

Signed-off-by: Matt Porter <mporter@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 503 insertions, 0 deletions

diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
new file mode 100644
index 0000000..adc299e
--- /dev/null
+++ b/drivers/rapidio/rio.c
@@ -0,0 +1,503 @@
+/*
+ * RapidIO interconnect services
+ * (RapidIO Interconnect Specification, http://www.rapidio.org)
+ *
+ * Copyright 2005 MontaVista Software, Inc.
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * 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;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/rio.h>
+#include <linux/rio_drv.h>
+#include <linux/rio_ids.h>
+#include <linux/rio_regs.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+
+#include "rio.h"
+
+static LIST_HEAD(rio_mports);
+
+/**
+ * rio_local_get_device_id - Get the base/extended device id for a port
+ * @port: RIO master port from which to get the deviceid
+ *
+ * Reads the base/extended device id from the local device
+ * implementing the master port. Returns the 8/16-bit device
+ * id.
+ */
+u16 rio_local_get_device_id(struct rio_mport *port)
+{
+	u32 result;
+
+	rio_local_read_config_32(port, RIO_DID_CSR, &result);
+
+	return (RIO_GET_DID(result));
+}
+
+/**
+ * rio_request_inb_mbox - request inbound mailbox service
+ * @mport: RIO master port from which to allocate the mailbox resource
+ * @mbox: Mailbox number to claim
+ * @entries: Number of entries in inbound mailbox queue
+ * @minb: Callback to execute when inbound message is received
+ *
+ * Requests ownership of an inbound mailbox resource and binds
+ * a callback function to the resource. Returns %0 on success.
+ */
+int rio_request_inb_mbox(struct rio_mport *mport,
+			 int mbox,
+			 int entries,
+			 void (*minb) (struct rio_mport * mport, int mbox,
+				       int slot))
+{
+	int rc = 0;
+
+	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
+
+	if (res) {
+		rio_init_mbox_res(res, mbox, mbox);
+
+		/* Make sure this mailbox isn't in use */
+		if ((rc =
+		     request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
+				      res)) < 0) {
+			kfree(res);
+			goto out;
+		}
+
+		mport->inb_msg[mbox].res = res;
+
+		/* Hook the inbound message callback */
+		mport->inb_msg[mbox].mcback = minb;
+
+		rc = rio_open_inb_mbox(mport, mbox, entries);
+	} else
+		rc = -ENOMEM;
+
+      out:
+	return rc;
+}
+
+/**
+ * rio_release_inb_mbox - release inbound mailbox message service
+ * @mport: RIO master port from which to release the mailbox resource
+ * @mbox: Mailbox number to release
+ *
+ * Releases ownership of an inbound mailbox resource. Returns 0
+ * if the request has been satisfied.
+ */
+int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
+{
+	rio_close_inb_mbox(mport, mbox);
+
+	/* Release the mailbox resource */
+	return release_resource(mport->inb_msg[mbox].res);
+}
+
+/**
+ * rio_request_outb_mbox - request outbound mailbox service
+ * @mport: RIO master port from which to allocate the mailbox resource
+ * @mbox: Mailbox number to claim
+ * @entries: Number of entries in outbound mailbox queue
+ * @moutb: Callback to execute when outbound message is sent
+ *
+ * Requests ownership of an outbound mailbox resource and binds
+ * a callback function to the resource. Returns 0 on success.
+ */
+int rio_request_outb_mbox(struct rio_mport *mport,
+			  int mbox,
+			  int entries,
+			  void (*moutb) (struct rio_mport * mport, int mbox,
+					 int slot))
+{
+	int rc = 0;
+
+	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
+
+	if (res) {
+		rio_init_mbox_res(res, mbox, mbox);
+
+		/* Make sure this outbound mailbox isn't in use */
+		if ((rc =
+		     request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
+				      res)) < 0) {
+			kfree(res);
+			goto out;
+		}
+
+		mport->outb_msg[mbox].res = res;
+
+		/* Hook the inbound message callback */
+		mport->outb_msg[mbox].mcback = moutb;
+
+		rc = rio_open_outb_mbox(mport, mbox, entries);
+	} else
+		rc = -ENOMEM;
+
+      out:
+	return rc;
+}
+
+/**
+ * rio_release_outb_mbox - release outbound mailbox message service
+ * @mport: RIO master port from which to release the mailbox resource
+ * @mbox: Mailbox number to release
+ *
+ * Releases ownership of an inbound mailbox resource. Returns 0
+ * if the request has been satisfied.
+ */
+int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
+{
+	rio_close_outb_mbox(mport, mbox);
+
+	/* Release the mailbox resource */
+	return release_resource(mport->outb_msg[mbox].res);
+}
+
+/**
+ * rio_setup_inb_dbell - bind inbound doorbell callback
+ * @mport: RIO master port to bind the doorbell callback
+ * @res: Doorbell message resource
+ * @dinb: Callback to execute when doorbell is received
+ *
+ * Adds a doorbell resource/callback pair into a port's
+ * doorbell event list. Returns 0 if the request has been
+ * satisfied.
+ */
+static int
+rio_setup_inb_dbell(struct rio_mport *mport, struct resource *res,
+		    void (*dinb) (struct rio_mport * mport, u16 src, u16 dst,
+				  u16 info))
+{
+	int rc = 0;
+	struct rio_dbell *dbell;
+
+	if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	dbell->res = res;
+	dbell->dinb = dinb;
+
+	list_add_tail(&dbell->node, &mport->dbells);
+
+      out:
+	return rc;
+}
+
+/**
+ * rio_request_inb_dbell - request inbound doorbell message service
+ * @mport: RIO master port from which to allocate the doorbell resource
+ * @start: Doorbell info range start
+ * @end: Doorbell info range end
+ * @dinb: Callback to execute when doorbell is received
+ *
+ * Requests ownership of an inbound doorbell resource and binds
+ * a callback function to the resource. Returns 0 if the request
+ * has been satisfied.
+ */
+int rio_request_inb_dbell(struct rio_mport *mport,
+			  u16 start,
+			  u16 end,
+			  void (*dinb) (struct rio_mport * mport, u16 src,
+					u16 dst, u16 info))
+{
+	int rc = 0;
+
+	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
+
+	if (res) {
+		rio_init_dbell_res(res, start, end);
+
+		/* Make sure these doorbells aren't in use */
+		if ((rc =
+		     request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
+				      res)) < 0) {
+			kfree(res);
+			goto out;
+		}
+
+		/* Hook the doorbell callback */
+		rc = rio_setup_inb_dbell(mport, res, dinb);
+	} else
+		rc = -ENOMEM;
+
+      out:
+	return rc;
+}
+
+/**
+ * rio_release_inb_dbell - release inbound doorbell message service
+ * @mport: RIO master port from which to release the doorbell resource
+ * @start: Doorbell info range start
+ * @end: Doorbell info range end
+ *
+ * Releases ownership of an inbound doorbell resource and removes
+ * callback from the doorbell event list. Returns 0 if the request
+ * has been satisfied.
+ */
+int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
+{
+	int rc = 0, found = 0;
+	struct rio_dbell *dbell;
+
+	list_for_each_entry(dbell, &mport->dbells, node) {
+		if ((dbell->res->start == start) && (dbell->res->end == end)) {
+			found = 1;
+			break;
+		}
+	}
+
+	/* If we can't find an exact match, fail */
+	if (!found) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	/* Delete from list */
+	list_del(&dbell->node);
+
+	/* Release the doorbell resource */
+	rc = release_resource(dbell->res);
+
+	/* Free the doorbell event */
+	kfree(dbell);
+
+      out:
+	return rc;
+}
+
+/**
+ * rio_request_outb_dbell - request outbound doorbell message range
+ * @rdev: RIO device from which to allocate the doorbell resource
+ * @start: Doorbell message range start
+ * @end: Doorbell message range end
+ *
+ * Requests ownership of a doorbell message range. Returns a resource
+ * if the request has been satisfied or %NULL on failure.
+ */
+struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
+					u16 end)
+{
+	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
+
+	if (res) {
+		rio_init_dbell_res(res, start, end);
+
+		/* Make sure these doorbells aren't in use */
+		if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
+		    < 0) {
+			kfree(res);
+			res = NULL;
+		}
+	}
+
+	return res;
+}
+
+/**
+ * rio_release_outb_dbell - release outbound doorbell message range
+ * @rdev: RIO device from which to release the doorbell resource
+ * @res: Doorbell resource to be freed
+ *
+ * Releases ownership of a doorbell message range. Returns 0 if the
+ * request has been satisfied.
+ */
+int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
+{
+	int rc = release_resource(res);
+
+	kfree(res);
+
+	return rc;
+}
+
+/**
+ * rio_mport_get_feature - query for devices' extended features
+ * @port: Master port to issue transaction
+ * @local: Indicate a local master port or remote device access
+ * @destid: Destination ID of the device
+ * @hopcount: Number of switch hops to the device
+ * @ftr: Extended feature code
+ *
+ * Tell if a device supports a given RapidIO capability.
+ * Returns the offset of the requested extended feature
+ * block within the device's RIO configuration space or
+ * 0 in case the device does not support it.  Possible
+ * values for @ftr:
+ *
+ * %RIO_EFB_PAR_EP_ID		LP/LVDS EP Devices
+ *
+ * %RIO_EFB_PAR_EP_REC_ID	LP/LVDS EP Recovery Devices
+ *
+ * %RIO_EFB_PAR_EP_FREE_ID	LP/LVDS EP Free Devices
+ *
+ * %RIO_EFB_SER_EP_ID		LP/Serial EP Devices
+ *
+ * %RIO_EFB_SER_EP_REC_ID	LP/Serial EP Recovery Devices
+ *
+ * %RIO_EFB_SER_EP_FREE_ID	LP/Serial EP Free Devices
+ */
+u32
+rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
+		      u8 hopcount, int ftr)
+{
+	u32 asm_info, ext_ftr_ptr, ftr_header;
+
+	if (local)
+		rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
+	else
+		rio_mport_read_config_32(port, destid, hopcount,
+					 RIO_ASM_INFO_CAR, &asm_info);
+
+	ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
+
+	while (ext_ftr_ptr) {
+		if (local)
+			rio_local_read_config_32(port, ext_ftr_ptr,
+						 &ftr_header);
+		else
+			rio_mport_read_config_32(port, destid, hopcount,
+						 ext_ftr_ptr, &ftr_header);
+		if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
+			return ext_ftr_ptr;
+		if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
+			break;
+	}
+
+	return 0;
+}
+
+/**
+ * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
+ * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
+ * @did: RIO did to match or %RIO_ANY_ID to match all dids
+ * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
+ * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
+ * @from: Previous RIO device found in search, or %NULL for new search
+ *
+ * Iterates through the list of known RIO devices. If a RIO device is
+ * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
+ * count to the device is incrememted and a pointer to its device
+ * structure is returned. Otherwise, %NULL is returned. A new search
+ * is initiated by passing %NULL to the @from argument. Otherwise, if
+ * @from is not %NULL, searches continue from next device on the global
+ * list. The reference count for @from is always decremented if it is
+ * not %NULL.
+ */
+struct rio_dev *rio_get_asm(u16 vid, u16 did,
+			    u16 asm_vid, u16 asm_did, struct rio_dev *from)
+{
+	struct list_head *n;
+	struct rio_dev *rdev;
+
+	WARN_ON(in_interrupt());
+	spin_lock(&rio_global_list_lock);
+	n = from ? from->global_list.next : rio_devices.next;
+
+	while (n && (n != &rio_devices)) {
+		rdev = rio_dev_g(n);
+		if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
+		    (did == RIO_ANY_ID || rdev->did == did) &&
+		    (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
+		    (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
+			goto exit;
+		n = n->next;
+	}
+	rdev = NULL;
+      exit:
+	rio_dev_put(from);
+	rdev = rio_dev_get(rdev);
+	spin_unlock(&rio_global_list_lock);
+	return rdev;
+}
+
+/**
+ * rio_get_device - Begin or continue searching for a RIO device by vid/did
+ * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
+ * @did: RIO did to match or %RIO_ANY_ID to match all dids
+ * @from: Previous RIO device found in search, or %NULL for new search
+ *
+ * Iterates through the list of known RIO devices. If a RIO device is
+ * found with a matching @vid and @did, the reference count to the
+ * device is incrememted and a pointer to its device structure is returned.
+ * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
+ * to the @from argument. Otherwise, if @from is not %NULL, searches
+ * continue from next device on the global list. The reference count for
+ * @from is always decremented if it is not %NULL.
+ */
+struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
+{
+	return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
+}
+
+static void rio_fixup_device(struct rio_dev *dev)
+{
+}
+
+static int __devinit rio_init(void)
+{
+	struct rio_dev *dev = NULL;
+
+	while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
+		rio_fixup_device(dev);
+	}
+	return 0;
+}
+
+device_initcall(rio_init);
+
+int rio_init_mports(void)
+{
+	int rc = 0;
+	struct rio_mport *port;
+
+	list_for_each_entry(port, &rio_mports, node) {
+		if (!request_mem_region(port->iores.start,
+					port->iores.end - port->iores.start,
+					port->name)) {
+			printk(KERN_ERR
+			       "RIO: Error requesting master port region %8.8lx-%8.8lx\n",
+			       port->iores.start, port->iores.end - 1);
+			rc = -ENOMEM;
+			goto out;
+		}
+
+		if (port->host_deviceid >= 0)
+			rio_enum_mport(port);
+		else
+			rio_disc_mport(port);
+	}
+
+      out:
+	return rc;
+}
+
+void rio_register_mport(struct rio_mport *port)
+{
+	list_add_tail(&port->node, &rio_mports);
+}
+
+EXPORT_SYMBOL_GPL(rio_local_get_device_id);
+EXPORT_SYMBOL_GPL(rio_get_device);
+EXPORT_SYMBOL_GPL(rio_get_asm);
+EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
+EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
+EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
+EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
+EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
+EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
+EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
+EXPORT_SYMBOL_GPL(rio_release_outb_mbox);