--- /dev/null
+/*
+ * RapidIO interconnect services
+ * (RapidIO Interconnect Specification, http://www.rapidio.org)
+ *
+ * Copyright 2005 MontaVista Software, Inc.
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * Copyright 2009 - 2013 Integrated Device Technology, Inc.
+ * Alex Bounine <alexandre.bounine@idt.com>
+ *
+ * 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/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 <linux/slab.h>
+#include <linux/interrupt.h>
+
+#include "rio.h"
+
+MODULE_DESCRIPTION("RapidIO Subsystem Core");
+MODULE_AUTHOR("Matt Porter <mporter@kernel.crashing.org>");
+MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
+MODULE_LICENSE("GPL");
+
+static int hdid[RIO_MAX_MPORTS];
+static int ids_num;
+module_param_array(hdid, int, &ids_num, 0);
+MODULE_PARM_DESC(hdid,
+ "Destination ID assignment to local RapidIO controllers");
+
+static LIST_HEAD(rio_devices);
+static DEFINE_SPINLOCK(rio_global_list_lock);
+
+static LIST_HEAD(rio_mports);
+static LIST_HEAD(rio_scans);
+static DEFINE_MUTEX(rio_mport_list_lock);
+static unsigned char next_portid;
+static DEFINE_SPINLOCK(rio_mmap_lock);
+
+/**
+ * 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(port->sys_size, result));
+}
+
+/**
+ * rio_add_device- Adds a RIO device to the device model
+ * @rdev: RIO device
+ *
+ * Adds the RIO device to the global device list and adds the RIO
+ * device to the RIO device list. Creates the generic sysfs nodes
+ * for an RIO device.
+ */
+int rio_add_device(struct rio_dev *rdev)
+{
+ int err;
+
+ err = device_add(&rdev->dev);
+ if (err)
+ return err;
+
+ spin_lock(&rio_global_list_lock);
+ list_add_tail(&rdev->global_list, &rio_devices);
+ spin_unlock(&rio_global_list_lock);
+
+ rio_create_sysfs_dev_files(rdev);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rio_add_device);
+
+/**
+ * rio_request_inb_mbox - request inbound mailbox service
+ * @mport: RIO master port from which to allocate the mailbox resource
+ * @dev_id: Device specific pointer to pass on event
+ * @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,
+ void *dev_id,
+ int mbox,
+ int entries,
+ void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
+ int slot))
+{
+ int rc = -ENOSYS;
+ struct resource *res;
+
+ if (mport->ops->open_inb_mbox == NULL)
+ goto out;
+
+ 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 = mport->ops->open_inb_mbox(mport, dev_id, 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)
+{
+ if (mport->ops->close_inb_mbox) {
+ mport->ops->close_inb_mbox(mport, mbox);
+
+ /* Release the mailbox resource */
+ return release_resource(mport->inb_msg[mbox].res);
+ } else
+ return -ENOSYS;
+}
+
+/**
+ * rio_request_outb_mbox - request outbound mailbox service
+ * @mport: RIO master port from which to allocate the mailbox resource
+ * @dev_id: Device specific pointer to pass on event
+ * @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,
+ void *dev_id,
+ int mbox,
+ int entries,
+ void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
+{
+ int rc = -ENOSYS;
+ struct resource *res;
+
+ if (mport->ops->open_outb_mbox == NULL)
+ goto out;
+
+ 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 = mport->ops->open_outb_mbox(mport, dev_id, 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)
+{
+ if (mport->ops->close_outb_mbox) {
+ mport->ops->close_outb_mbox(mport, mbox);
+
+ /* Release the mailbox resource */
+ return release_resource(mport->outb_msg[mbox].res);
+ } else
+ return -ENOSYS;
+}
+
+/**
+ * rio_setup_inb_dbell - bind inbound doorbell callback
+ * @mport: RIO master port to bind the doorbell callback
+ * @dev_id: Device specific pointer to pass on event
+ * @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, void *dev_id, struct resource *res,
+ void (*dinb) (struct rio_mport * mport, void *dev_id, 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;
+ dbell->dev_id = dev_id;
+
+ 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
+ * @dev_id: Device specific pointer to pass on event
+ * @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,
+ void *dev_id,
+ u16 start,
+ u16 end,
+ void (*dinb) (struct rio_mport * mport, void *dev_id, 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, dev_id, 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_request_inb_pwrite - request inbound port-write message service
+ * @rdev: RIO device to which register inbound port-write callback routine
+ * @pwcback: Callback routine to execute when port-write is received
+ *
+ * Binds a port-write callback function to the RapidIO device.
+ * Returns 0 if the request has been satisfied.
+ */
+int rio_request_inb_pwrite(struct rio_dev *rdev,
+ int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))
+{
+ int rc = 0;
+
+ spin_lock(&rio_global_list_lock);
+ if (rdev->pwcback != NULL)
+ rc = -ENOMEM;
+ else
+ rdev->pwcback = pwcback;
+
+ spin_unlock(&rio_global_list_lock);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);
+
+/**
+ * rio_release_inb_pwrite - release inbound port-write message service
+ * @rdev: RIO device which registered for inbound port-write callback
+ *
+ * Removes callback from the rio_dev structure. Returns 0 if the request
+ * has been satisfied.
+ */
+int rio_release_inb_pwrite(struct rio_dev *rdev)
+{
+ int rc = -ENOMEM;
+
+ spin_lock(&rio_global_list_lock);
+ if (rdev->pwcback) {
+ rdev->pwcback = NULL;
+ rc = 0;
+ }
+
+ spin_unlock(&rio_global_list_lock);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
+
+/**
+ * rio_map_inb_region -- Map inbound memory region.
+ * @mport: Master port.
+ * @local: physical address of memory region to be mapped
+ * @rbase: RIO base address assigned to this window
+ * @size: Size of the memory region
+ * @rflags: Flags for mapping.
+ *
+ * Return: 0 -- Success.
+ *
+ * This function will create the mapping from RIO space to local memory.
+ */
+int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
+ u64 rbase, u32 size, u32 rflags)
+{
+ int rc = 0;
+ unsigned long flags;
+
+ if (!mport->ops->map_inb)
+ return -1;
+ spin_lock_irqsave(&rio_mmap_lock, flags);
+ rc = mport->ops->map_inb(mport, local, rbase, size, rflags);
+ spin_unlock_irqrestore(&rio_mmap_lock, flags);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(rio_map_inb_region);
+
+/**
+ * rio_unmap_inb_region -- Unmap the inbound memory region
+ * @mport: Master port
+ * @lstart: physical address of memory region to be unmapped
+ */
+void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
+{
+ unsigned long flags;
+ if (!mport->ops->unmap_inb)
+ return;
+ spin_lock_irqsave(&rio_mmap_lock, flags);
+ mport->ops->unmap_inb(mport, lstart);
+ spin_unlock_irqrestore(&rio_mmap_lock, flags);
+}
+EXPORT_SYMBOL_GPL(rio_unmap_inb_region);
+
+/**
+ * rio_mport_get_physefb - Helper function that returns register offset
+ * for Physical Layer Extended Features Block.
+ * @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
+ */
+u32
+rio_mport_get_physefb(struct rio_mport *port, int local,
+ u16 destid, u8 hopcount)
+{
+ u32 ext_ftr_ptr;
+ u32 ftr_header;
+
+ ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);
+
+ 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);
+
+ ftr_header = RIO_GET_BLOCK_ID(ftr_header);
+ switch (ftr_header) {
+
+ case RIO_EFB_SER_EP_ID_V13P:
+ case RIO_EFB_SER_EP_REC_ID_V13P:
+ case RIO_EFB_SER_EP_FREE_ID_V13P:
+ case RIO_EFB_SER_EP_ID:
+ case RIO_EFB_SER_EP_REC_ID:
+ case RIO_EFB_SER_EP_FREE_ID:
+ case RIO_EFB_SER_EP_FREC_ID:
+
+ return ext_ftr_ptr;
+
+ default:
+ break;
+ }
+
+ ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
+ hopcount, ext_ftr_ptr);
+ }
+
+ return ext_ftr_ptr;
+}
+EXPORT_SYMBOL_GPL(rio_mport_get_physefb);
+
+/**
+ * rio_get_comptag - Begin or continue searching for a RIO device by component tag
+ * @comp_tag: RIO component tag to match
+ * @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 @comp_tag, 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.
+ */
+struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
+{
+ struct list_head *n;
+ struct rio_dev *rdev;
+
+ 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 (rdev->comp_tag == comp_tag)
+ goto exit;
+ n = n->next;
+ }
+ rdev = NULL;
+exit:
+ spin_unlock(&rio_global_list_lock);
+ return rdev;
+}
+EXPORT_SYMBOL_GPL(rio_get_comptag);
+
+/**
+ * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
+ * @rdev: Pointer to RIO device control structure
+ * @pnum: Switch port number to set LOCKOUT bit
+ * @lock: Operation : set (=1) or clear (=0)
+ */
+int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
+{
+ u32 regval;
+
+ rio_read_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
+ ®val);
+ if (lock)
+ regval |= RIO_PORT_N_CTL_LOCKOUT;
+ else
+ regval &= ~RIO_PORT_N_CTL_LOCKOUT;
+
+ rio_write_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
+ regval);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rio_set_port_lockout);
+
+/**
+ * rio_enable_rx_tx_port - enable input receiver and output transmitter of
+ * given port
+ * @port: Master port associated with the RIO network
+ * @local: local=1 select local port otherwise a far device is reached
+ * @destid: Destination ID of the device to check host bit
+ * @hopcount: Number of hops to reach the target
+ * @port_num: Port (-number on switch) to enable on a far end device
+ *
+ * Returns 0 or 1 from on General Control Command and Status Register
+ * (EXT_PTR+0x3C)
+ */
+int rio_enable_rx_tx_port(struct rio_mport *port,
+ int local, u16 destid,
+ u8 hopcount, u8 port_num)
+{
+#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
+ u32 regval;
+ u32 ext_ftr_ptr;
+
+ /*
+ * enable rx input tx output port
+ */
+ pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
+ "%d, port_num = %d)\n", local, destid, hopcount, port_num);
+
+ ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
+
+ if (local) {
+ rio_local_read_config_32(port, ext_ftr_ptr +
+ RIO_PORT_N_CTL_CSR(0),
+ ®val);
+ } else {
+ if (rio_mport_read_config_32(port, destid, hopcount,
+ ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0)
+ return -EIO;
+ }
+
+ if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
+ /* serial */
+ regval = regval | RIO_PORT_N_CTL_EN_RX_SER
+ | RIO_PORT_N_CTL_EN_TX_SER;
+ } else {
+ /* parallel */
+ regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
+ | RIO_PORT_N_CTL_EN_TX_PAR;
+ }
+
+ if (local) {
+ rio_local_write_config_32(port, ext_ftr_ptr +
+ RIO_PORT_N_CTL_CSR(0), regval);
+ } else {
+ if (rio_mport_write_config_32(port, destid, hopcount,
+ ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
+ return -EIO;
+ }
+#endif
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rio_enable_rx_tx_port);
+
+
+/**
+ * rio_chk_dev_route - Validate route to the specified device.
+ * @rdev: RIO device failed to respond
+ * @nrdev: Last active device on the route to rdev
+ * @npnum: nrdev's port number on the route to rdev
+ *
+ * Follows a route to the specified RIO device to determine the last available
+ * device (and corresponding RIO port) on the route.
+ */
+static int
+rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
+{
+ u32 result;
+ int p_port, rc = -EIO;
+ struct rio_dev *prev = NULL;
+
+ /* Find switch with failed RIO link */
+ while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {
+ if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {
+ prev = rdev->prev;
+ break;
+ }
+ rdev = rdev->prev;
+ }
+
+ if (prev == NULL)
+ goto err_out;
+
+ p_port = prev->rswitch->route_table[rdev->destid];
+
+ if (p_port != RIO_INVALID_ROUTE) {
+ pr_debug("RIO: link failed on [%s]-P%d\n",
+ rio_name(prev), p_port);
+ *nrdev = prev;
+ *npnum = p_port;
+ rc = 0;
+ } else
+ pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
+err_out:
+ return rc;
+}
+
+/**
+ * rio_mport_chk_dev_access - Validate access to the specified device.
+ * @mport: Master port to send transactions
+ * @destid: Device destination ID in network
+ * @hopcount: Number of hops into the network
+ */
+int
+rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
+{
+ int i = 0;
+ u32 tmp;
+
+ while (rio_mport_read_config_32(mport, destid, hopcount,
+ RIO_DEV_ID_CAR, &tmp)) {
+ i++;
+ if (i == RIO_MAX_CHK_RETRY)
+ return -EIO;
+ mdelay(1);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rio_mport_chk_dev_access);
+
+/**
+ * rio_chk_dev_access - Validate access to the specified device.
+ * @rdev: Pointer to RIO device control structure
+ */
+static int rio_chk_dev_access(struct rio_dev *rdev)
+{
+ return rio_mport_chk_dev_access(rdev->net->hport,
+ rdev->destid, rdev->hopcount);
+}
+
+/**
+ * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and
+ * returns link-response (if requested).
+ * @rdev: RIO devive to issue Input-status command
+ * @pnum: Device port number to issue the command
+ * @lnkresp: Response from a link partner
+ */
+static int
+rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)
+{
+ u32 regval;
+ int checkcount;
+
+ if (lnkresp) {
+ /* Read from link maintenance response register
+ * to clear valid bit */
+ rio_read_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
+ ®val);
+ udelay(50);
+ }
+
+ /* Issue Input-status command */
+ rio_write_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_N_MNT_REQ_CSR(pnum),
+ RIO_MNT_REQ_CMD_IS);
+
+ /* Exit if the response is not expected */
+ if (lnkresp == NULL)
+ return 0;
+
+ checkcount = 3;
+ while (checkcount--) {
+ udelay(50);
+ rio_read_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
+ ®val);
+ if (regval & RIO_PORT_N_MNT_RSP_RVAL) {
+ *lnkresp = regval;
+ return 0;
+ }
+ }
+
+ return -EIO;
+}
+
+/**
+ * rio_clr_err_stopped - Clears port Error-stopped states.
+ * @rdev: Pointer to RIO device control structure
+ * @pnum: Switch port number to clear errors
+ * @err_status: port error status (if 0 reads register from device)
+ */
+static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
+{
+ struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
+ u32 regval;
+ u32 far_ackid, far_linkstat, near_ackid;
+
+ if (err_status == 0)
+ rio_read_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
+ &err_status);
+
+ if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) {
+ pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
+ /*
+ * Send a Link-Request/Input-Status control symbol
+ */
+ if (rio_get_input_status(rdev, pnum, ®val)) {
+ pr_debug("RIO_EM: Input-status response timeout\n");
+ goto rd_err;
+ }
+
+ pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
+ pnum, regval);
+ far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
+ far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
+ rio_read_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
+ ®val);
+ pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
+ near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
+ pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
+ " near_ackID=0x%02x\n",
+ pnum, far_ackid, far_linkstat, near_ackid);
+
+ /*
+ * If required, synchronize ackIDs of near and
+ * far sides.
+ */
+ if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||
+ (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
+ /* Align near outstanding/outbound ackIDs with
+ * far inbound.
+ */
+ rio_write_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
+ (near_ackid << 24) |
+ (far_ackid << 8) | far_ackid);
+ /* Align far outstanding/outbound ackIDs with
+ * near inbound.
+ */
+ far_ackid++;
+ if (nextdev)
+ rio_write_config_32(nextdev,
+ nextdev->phys_efptr +
+ RIO_PORT_N_ACK_STS_CSR(RIO_GET_PORT_NUM(nextdev->swpinfo)),
+ (far_ackid << 24) |
+ (near_ackid << 8) | near_ackid);
+ else
+ pr_debug("RIO_EM: Invalid nextdev pointer (NULL)\n");
+ }
+rd_err:
+ rio_read_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
+ &err_status);
+ pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
+ }
+
+ if ((err_status & RIO_PORT_N_ERR_STS_PW_INP_ES) && nextdev) {
+ pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
+ rio_get_input_status(nextdev,
+ RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
+ udelay(50);
+
+ rio_read_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
+ &err_status);
+ pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
+ }
+
+ return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
+ RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0;
+}
+
+/**
+ * rio_inb_pwrite_handler - process inbound port-write message
+ * @pw_msg: pointer to inbound port-write message
+ *
+ * Processes an inbound port-write message. Returns 0 if the request
+ * has been satisfied.
+ */
+int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg)
+{
+ struct rio_dev *rdev;
+ u32 err_status, em_perrdet, em_ltlerrdet;
+ int rc, portnum;
+
+ rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);
+ if (rdev == NULL) {
+ /* Device removed or enumeration error */
+ pr_debug("RIO: %s No matching device for CTag 0x%08x\n",
+ __func__, pw_msg->em.comptag);
+ return -EIO;
+ }
+
+ pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));
+
+#ifdef DEBUG_PW
+ {
+ u32 i;
+ for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32);) {
+ pr_debug("0x%02x: %08x %08x %08x %08x\n",
+ i*4, pw_msg->raw[i], pw_msg->raw[i + 1],
+ pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
+ i += 4;
+ }
+ }
+#endif
+
+ /* Call an external service function (if such is registered
+ * for this device). This may be the service for endpoints that send
+ * device-specific port-write messages. End-point messages expected
+ * to be handled completely by EP specific device driver.
+ * For switches rc==0 signals that no standard processing required.
+ */
+ if (rdev->pwcback != NULL) {
+ rc = rdev->pwcback(rdev, pw_msg, 0);
+ if (rc == 0)
+ return 0;
+ }
+
+ portnum = pw_msg->em.is_port & 0xFF;
+
+ /* Check if device and route to it are functional:
+ * Sometimes devices may send PW message(s) just before being
+ * powered down (or link being lost).
+ */
+ if (rio_chk_dev_access(rdev)) {
+ pr_debug("RIO: device access failed - get link partner\n");
+ /* Scan route to the device and identify failed link.
+ * This will replace device and port reported in PW message.
+ * PW message should not be used after this point.
+ */
+ if (rio_chk_dev_route(rdev, &rdev, &portnum)) {
+ pr_err("RIO: Route trace for %s failed\n",
+ rio_name(rdev));
+ return -EIO;
+ }
+ pw_msg = NULL;
+ }
+
+ /* For End-point devices processing stops here */
+ if (!(rdev->pef & RIO_PEF_SWITCH))
+ return 0;
+
+ if (rdev->phys_efptr == 0) {
+ pr_err("RIO_PW: Bad switch initialization for %s\n",
+ rio_name(rdev));
+ return 0;
+ }
+
+ /*
+ * Process the port-write notification from switch
+ */
+ if (rdev->rswitch->ops && rdev->rswitch->ops->em_handle)
+ rdev->rswitch->ops->em_handle(rdev, portnum);
+
+ rio_read_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
+ &err_status);
+ pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);
+
+ if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
+
+ if (!(rdev->rswitch->port_ok & (1 << portnum))) {
+ rdev->rswitch->port_ok |= (1 << portnum);
+ rio_set_port_lockout(rdev, portnum, 0);
+ /* Schedule Insertion Service */
+ pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",
+ rio_name(rdev), portnum);
+ }
+
+ /* Clear error-stopped states (if reported).
+ * Depending on the link partner state, two attempts
+ * may be needed for successful recovery.
+ */
+ if (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
+ RIO_PORT_N_ERR_STS_PW_INP_ES)) {
+ if (rio_clr_err_stopped(rdev, portnum, err_status))
+ rio_clr_err_stopped(rdev, portnum, 0);
+ }
+ } else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */
+
+ if (rdev->rswitch->port_ok & (1 << portnum)) {
+ rdev->rswitch->port_ok &= ~(1 << portnum);
+ rio_set_port_lockout(rdev, portnum, 1);
+
+ rio_write_config_32(rdev,
+ rdev->phys_efptr +
+ RIO_PORT_N_ACK_STS_CSR(portnum),
+ RIO_PORT_N_ACK_CLEAR);
+
+ /* Schedule Extraction Service */
+ pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
+ rio_name(rdev), portnum);
+ }
+ }
+
+ rio_read_config_32(rdev,
+ rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
+ if (em_perrdet) {
+ pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
+ portnum, em_perrdet);
+ /* Clear EM Port N Error Detect CSR */
+ rio_write_config_32(rdev,
+ rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
+ }
+
+ rio_read_config_32(rdev,
+ rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);
+ if (em_ltlerrdet) {
+ pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
+ em_ltlerrdet);
+ /* Clear EM L/T Layer Error Detect CSR */
+ rio_write_config_32(rdev,
+ rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
+ }
+
+ /* Clear remaining error bits and Port-Write Pending bit */
+ rio_write_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
+ err_status);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);
+
+/**
+ * rio_mport_get_efb - get pointer to next extended features block
+ * @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
+ * @from: Offset of current Extended Feature block header (if 0 starts
+ * from ExtFeaturePtr)
+ */
+u32
+rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
+ u8 hopcount, u32 from)
+{
+ u32 reg_val;
+
+ if (from == 0) {
+ if (local)
+ rio_local_read_config_32(port, RIO_ASM_INFO_CAR,
+ ®_val);
+ else
+ rio_mport_read_config_32(port, destid, hopcount,
+ RIO_ASM_INFO_CAR, ®_val);
+ return reg_val & RIO_EXT_FTR_PTR_MASK;
+ } else {
+ if (local)
+ rio_local_read_config_32(port, from, ®_val);
+ else
+ rio_mport_read_config_32(port, destid, hopcount,
+ from, ®_val);
+ return RIO_GET_BLOCK_ID(reg_val);
+ }
+}
+EXPORT_SYMBOL_GPL(rio_mport_get_efb);
+
+/**
+ * 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;
+}
+EXPORT_SYMBOL_GPL(rio_mport_get_feature);
+
+/**
+ * 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);
+}
+
+/**
+ * rio_std_route_add_entry - Add switch route table entry using standard
+ * registers defined in RIO specification rev.1.3
+ * @mport: Master port to issue transaction
+ * @destid: Destination ID of the device
+ * @hopcount: Number of switch hops to the device
+ * @table: routing table ID (global or port-specific)
+ * @route_destid: destID entry in the RT
+ * @route_port: destination port for specified destID
+ */
+static int
+rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
+ u16 table, u16 route_destid, u8 route_port)
+{
+ if (table == RIO_GLOBAL_TABLE) {
+ rio_mport_write_config_32(mport, destid, hopcount,
+ RIO_STD_RTE_CONF_DESTID_SEL_CSR,
+ (u32)route_destid);
+ rio_mport_write_config_32(mport, destid, hopcount,
+ RIO_STD_RTE_CONF_PORT_SEL_CSR,
+ (u32)route_port);
+ }
+
+ udelay(10);
+ return 0;
+}
+
+/**
+ * rio_std_route_get_entry - Read switch route table entry (port number)
+ * associated with specified destID using standard registers defined in RIO
+ * specification rev.1.3
+ * @mport: Master port to issue transaction
+ * @destid: Destination ID of the device
+ * @hopcount: Number of switch hops to the device
+ * @table: routing table ID (global or port-specific)
+ * @route_destid: destID entry in the RT
+ * @route_port: returned destination port for specified destID
+ */
+static int
+rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
+ u16 table, u16 route_destid, u8 *route_port)
+{
+ u32 result;
+
+ if (table == RIO_GLOBAL_TABLE) {
+ rio_mport_write_config_32(mport, destid, hopcount,
+ RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);
+ rio_mport_read_config_32(mport, destid, hopcount,
+ RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);
+
+ *route_port = (u8)result;
+ }
+
+ return 0;
+}
+
+/**
+ * rio_std_route_clr_table - Clear swotch route table using standard registers
+ * defined in RIO specification rev.1.3.
+ * @mport: Master port to issue transaction
+ * @destid: Destination ID of the device
+ * @hopcount: Number of switch hops to the device
+ * @table: routing table ID (global or port-specific)
+ */
+static int
+rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
+ u16 table)
+{
+ u32 max_destid = 0xff;
+ u32 i, pef, id_inc = 1, ext_cfg = 0;
+ u32 port_sel = RIO_INVALID_ROUTE;
+
+ if (table == RIO_GLOBAL_TABLE) {
+ rio_mport_read_config_32(mport, destid, hopcount,
+ RIO_PEF_CAR, &pef);
+
+ if (mport->sys_size) {
+ rio_mport_read_config_32(mport, destid, hopcount,
+ RIO_SWITCH_RT_LIMIT,
+ &max_destid);
+ max_destid &= RIO_RT_MAX_DESTID;
+ }
+
+ if (pef & RIO_PEF_EXT_RT) {
+ ext_cfg = 0x80000000;
+ id_inc = 4;
+ port_sel = (RIO_INVALID_ROUTE << 24) |
+ (RIO_INVALID_ROUTE << 16) |
+ (RIO_INVALID_ROUTE << 8) |
+ RIO_INVALID_ROUTE;
+ }
+
+ for (i = 0; i <= max_destid;) {
+ rio_mport_write_config_32(mport, destid, hopcount,
+ RIO_STD_RTE_CONF_DESTID_SEL_CSR,
+ ext_cfg | i);
+ rio_mport_write_config_32(mport, destid, hopcount,
+ RIO_STD_RTE_CONF_PORT_SEL_CSR,
+ port_sel);
+ i += id_inc;
+ }
+ }
+
+ udelay(10);
+ return 0;
+}
+
+/**
+ * rio_lock_device - Acquires host device lock for specified device
+ * @port: Master port to send transaction
+ * @destid: Destination ID for device/switch
+ * @hopcount: Hopcount to reach switch
+ * @wait_ms: Max wait time in msec (0 = no timeout)
+ *
+ * Attepts to acquire host device lock for specified device
+ * Returns 0 if device lock acquired or EINVAL if timeout expires.
+ */
+int rio_lock_device(struct rio_mport *port, u16 destid,
+ u8 hopcount, int wait_ms)
+{
+ u32 result;
+ int tcnt = 0;
+
+ /* Attempt to acquire device lock */
+ rio_mport_write_config_32(port, destid, hopcount,
+ RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
+ rio_mport_read_config_32(port, destid, hopcount,
+ RIO_HOST_DID_LOCK_CSR, &result);
+
+ while (result != port->host_deviceid) {
+ if (wait_ms != 0 && tcnt == wait_ms) {
+ pr_debug("RIO: timeout when locking device %x:%x\n",
+ destid, hopcount);
+ return -EINVAL;
+ }
+
+ /* Delay a bit */
+ mdelay(1);
+ tcnt++;
+ /* Try to acquire device lock again */
+ rio_mport_write_config_32(port, destid,
+ hopcount,
+ RIO_HOST_DID_LOCK_CSR,
+ port->host_deviceid);
+ rio_mport_read_config_32(port, destid,
+ hopcount,
+ RIO_HOST_DID_LOCK_CSR, &result);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rio_lock_device);
+
+/**
+ * rio_unlock_device - Releases host device lock for specified device
+ * @port: Master port to send transaction
+ * @destid: Destination ID for device/switch
+ * @hopcount: Hopcount to reach switch
+ *
+ * Returns 0 if device lock released or EINVAL if fails.
+ */
+int rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
+{
+ u32 result;
+
+ /* Release device lock */
+ rio_mport_write_config_32(port, destid,
+ hopcount,
+ RIO_HOST_DID_LOCK_CSR,
+ port->host_deviceid);
+ rio_mport_read_config_32(port, destid, hopcount,
+ RIO_HOST_DID_LOCK_CSR, &result);
+ if ((result & 0xffff) != 0xffff) {
+ pr_debug("RIO: badness when releasing device lock %x:%x\n",
+ destid, hopcount);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rio_unlock_device);
+
+/**
+ * rio_route_add_entry- Add a route entry to a switch routing table
+ * @rdev: RIO device
+ * @table: Routing table ID
+ * @route_destid: Destination ID to be routed
+ * @route_port: Port number to be routed
+ * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
+ *
+ * If available calls the switch specific add_entry() method to add a route
+ * entry into a switch routing table. Otherwise uses standard RT update method
+ * as defined by RapidIO specification. A specific routing table can be selected
+ * using the @table argument if a switch has per port routing tables or
+ * the standard (or global) table may be used by passing
+ * %RIO_GLOBAL_TABLE in @table.
+ *
+ * Returns %0 on success or %-EINVAL on failure.
+ */
+int rio_route_add_entry(struct rio_dev *rdev,
+ u16 table, u16 route_destid, u8 route_port, int lock)
+{
+ int rc = -EINVAL;
+ struct rio_switch_ops *ops = rdev->rswitch->ops;
+
+ if (lock) {
+ rc = rio_lock_device(rdev->net->hport, rdev->destid,
+ rdev->hopcount, 1000);
+ if (rc)
+ return rc;
+ }
+
+ spin_lock(&rdev->rswitch->lock);
+
+ if (ops == NULL || ops->add_entry == NULL) {
+ rc = rio_std_route_add_entry(rdev->net->hport, rdev->destid,
+ rdev->hopcount, table,
+ route_destid, route_port);
+ } else if (try_module_get(ops->owner)) {
+ rc = ops->add_entry(rdev->net->hport, rdev->destid,
+ rdev->hopcount, table, route_destid,
+ route_port);
+ module_put(ops->owner);
+ }
+
+ spin_unlock(&rdev->rswitch->lock);
+
+ if (lock)
+ rio_unlock_device(rdev->net->hport, rdev->destid,
+ rdev->hopcount);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(rio_route_add_entry);
+
+/**
+ * rio_route_get_entry- Read an entry from a switch routing table
+ * @rdev: RIO device
+ * @table: Routing table ID
+ * @route_destid: Destination ID to be routed
+ * @route_port: Pointer to read port number into
+ * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
+ *
+ * If available calls the switch specific get_entry() method to fetch a route
+ * entry from a switch routing table. Otherwise uses standard RT read method
+ * as defined by RapidIO specification. A specific routing table can be selected
+ * using the @table argument if a switch has per port routing tables or
+ * the standard (or global) table may be used by passing
+ * %RIO_GLOBAL_TABLE in @table.
+ *
+ * Returns %0 on success or %-EINVAL on failure.
+ */
+int rio_route_get_entry(struct rio_dev *rdev, u16 table,
+ u16 route_destid, u8 *route_port, int lock)
+{
+ int rc = -EINVAL;
+ struct rio_switch_ops *ops = rdev->rswitch->ops;
+
+ if (lock) {
+ rc = rio_lock_device(rdev->net->hport, rdev->destid,
+ rdev->hopcount, 1000);
+ if (rc)
+ return rc;
+ }
+
+ spin_lock(&rdev->rswitch->lock);
+
+ if (ops == NULL || ops->get_entry == NULL) {
+ rc = rio_std_route_get_entry(rdev->net->hport, rdev->destid,
+ rdev->hopcount, table,
+ route_destid, route_port);
+ } else if (try_module_get(ops->owner)) {
+ rc = ops->get_entry(rdev->net->hport, rdev->destid,
+ rdev->hopcount, table, route_destid,
+ route_port);
+ module_put(ops->owner);
+ }
+
+ spin_unlock(&rdev->rswitch->lock);
+
+ if (lock)
+ rio_unlock_device(rdev->net->hport, rdev->destid,
+ rdev->hopcount);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(rio_route_get_entry);
+
+/**
+ * rio_route_clr_table - Clear a switch routing table
+ * @rdev: RIO device
+ * @table: Routing table ID
+ * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
+ *
+ * If available calls the switch specific clr_table() method to clear a switch
+ * routing table. Otherwise uses standard RT write method as defined by RapidIO
+ * specification. A specific routing table can be selected using the @table
+ * argument if a switch has per port routing tables or the standard (or global)
+ * table may be used by passing %RIO_GLOBAL_TABLE in @table.
+ *
+ * Returns %0 on success or %-EINVAL on failure.
+ */
+int rio_route_clr_table(struct rio_dev *rdev, u16 table, int lock)
+{
+ int rc = -EINVAL;
+ struct rio_switch_ops *ops = rdev->rswitch->ops;
+
+ if (lock) {
+ rc = rio_lock_device(rdev->net->hport, rdev->destid,
+ rdev->hopcount, 1000);
+ if (rc)
+ return rc;
+ }
+
+ spin_lock(&rdev->rswitch->lock);
+
+ if (ops == NULL || ops->clr_table == NULL) {
+ rc = rio_std_route_clr_table(rdev->net->hport, rdev->destid,
+ rdev->hopcount, table);
+ } else if (try_module_get(ops->owner)) {
+ rc = ops->clr_table(rdev->net->hport, rdev->destid,
+ rdev->hopcount, table);
+
+ module_put(ops->owner);
+ }
+
+ spin_unlock(&rdev->rswitch->lock);
+
+ if (lock)
+ rio_unlock_device(rdev->net->hport, rdev->destid,
+ rdev->hopcount);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(rio_route_clr_table);
+
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+
+static bool rio_chan_filter(struct dma_chan *chan, void *arg)
+{
+ struct rio_mport *mport = arg;
+
+ /* Check that DMA device belongs to the right MPORT */
+ return mport == container_of(chan->device, struct rio_mport, dma);
+}
+
+/**
+ * rio_request_mport_dma - request RapidIO capable DMA channel associated
+ * with specified local RapidIO mport device.
+ * @mport: RIO mport to perform DMA data transfers
+ *
+ * Returns pointer to allocated DMA channel or NULL if failed.
+ */
+struct dma_chan *rio_request_mport_dma(struct rio_mport *mport)
+{
+ dma_cap_mask_t mask;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+ return dma_request_channel(mask, rio_chan_filter, mport);
+}
+EXPORT_SYMBOL_GPL(rio_request_mport_dma);
+
+/**
+ * rio_request_dma - request RapidIO capable DMA channel that supports
+ * specified target RapidIO device.
+ * @rdev: RIO device associated with DMA transfer
+ *
+ * Returns pointer to allocated DMA channel or NULL if failed.
+ */
+struct dma_chan *rio_request_dma(struct rio_dev *rdev)
+{
+ return rio_request_mport_dma(rdev->net->hport);
+}
+EXPORT_SYMBOL_GPL(rio_request_dma);
+
+/**
+ * rio_release_dma - release specified DMA channel
+ * @dchan: DMA channel to release
+ */
+void rio_release_dma(struct dma_chan *dchan)
+{
+ dma_release_channel(dchan);
+}
+EXPORT_SYMBOL_GPL(rio_release_dma);
+
+/**
+ * rio_dma_prep_xfer - RapidIO specific wrapper
+ * for device_prep_slave_sg callback defined by DMAENGINE.
+ * @dchan: DMA channel to configure
+ * @destid: target RapidIO device destination ID
+ * @data: RIO specific data descriptor
+ * @direction: DMA data transfer direction (TO or FROM the device)
+ * @flags: dmaengine defined flags
+ *
+ * Initializes RapidIO capable DMA channel for the specified data transfer.
+ * Uses DMA channel private extension to pass information related to remote
+ * target RIO device.
+ * Returns pointer to DMA transaction descriptor or NULL if failed.
+ */
+struct dma_async_tx_descriptor *rio_dma_prep_xfer(struct dma_chan *dchan,
+ u16 destid, struct rio_dma_data *data,
+ enum dma_transfer_direction direction, unsigned long flags)
+{
+ struct rio_dma_ext rio_ext;
+
+ if (dchan->device->device_prep_slave_sg == NULL) {
+ pr_err("%s: prep_rio_sg == NULL\n", __func__);
+ return NULL;
+ }
+
+ rio_ext.destid = destid;
+ rio_ext.rio_addr_u = data->rio_addr_u;
+ rio_ext.rio_addr = data->rio_addr;
+ rio_ext.wr_type = data->wr_type;
+
+ return dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,
+ direction, flags, &rio_ext);
+}
+EXPORT_SYMBOL_GPL(rio_dma_prep_xfer);
+
+/**
+ * rio_dma_prep_slave_sg - RapidIO specific wrapper
+ * for device_prep_slave_sg callback defined by DMAENGINE.
+ * @rdev: RIO device control structure
+ * @dchan: DMA channel to configure
+ * @data: RIO specific data descriptor
+ * @direction: DMA data transfer direction (TO or FROM the device)
+ * @flags: dmaengine defined flags
+ *
+ * Initializes RapidIO capable DMA channel for the specified data transfer.
+ * Uses DMA channel private extension to pass information related to remote
+ * target RIO device.
+ * Returns pointer to DMA transaction descriptor or NULL if failed.
+ */
+struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,
+ struct dma_chan *dchan, struct rio_dma_data *data,
+ enum dma_transfer_direction direction, unsigned long flags)
+{
+ return rio_dma_prep_xfer(dchan, rdev->destid, data, direction, flags);
+}
+EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
+
+#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
+
+/**
+ * rio_find_mport - find RIO mport by its ID
+ * @mport_id: number (ID) of mport device
+ *
+ * Given a RIO mport number, the desired mport is located
+ * in the global list of mports. If the mport is found, a pointer to its
+ * data structure is returned. If no mport is found, %NULL is returned.
+ */
+struct rio_mport *rio_find_mport(int mport_id)
+{
+ struct rio_mport *port;
+
+ mutex_lock(&rio_mport_list_lock);
+ list_for_each_entry(port, &rio_mports, node) {
+ if (port->id == mport_id)
+ goto found;
+ }
+ port = NULL;
+found:
+ mutex_unlock(&rio_mport_list_lock);
+
+ return port;
+}
+
+/**
+ * rio_register_scan - enumeration/discovery method registration interface
+ * @mport_id: mport device ID for which fabric scan routine has to be set
+ * (RIO_MPORT_ANY = set for all available mports)
+ * @scan_ops: enumeration/discovery operations structure
+ *
+ * Registers enumeration/discovery operations with RapidIO subsystem and
+ * attaches it to the specified mport device (or all available mports
+ * if RIO_MPORT_ANY is specified).
+ *
+ * Returns error if the mport already has an enumerator attached to it.
+ * In case of RIO_MPORT_ANY skips mports with valid scan routines (no error).
+ */
+int rio_register_scan(int mport_id, struct rio_scan *scan_ops)
+{
+ struct rio_mport *port;
+ struct rio_scan_node *scan;
+ int rc = 0;
+
+ pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
+
+ if ((mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS) ||
+ !scan_ops)
+ return -EINVAL;
+
+ mutex_lock(&rio_mport_list_lock);
+
+ /*
+ * Check if there is another enumerator already registered for
+ * the same mport ID (including RIO_MPORT_ANY). Multiple enumerators
+ * for the same mport ID are not supported.
+ */
+ list_for_each_entry(scan, &rio_scans, node) {
+ if (scan->mport_id == mport_id) {
+ rc = -EBUSY;
+ goto err_out;
+ }
+ }
+
+ /*
+ * Allocate and initialize new scan registration node.
+ */
+ scan = kzalloc(sizeof(*scan), GFP_KERNEL);
+ if (!scan) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ scan->mport_id = mport_id;
+ scan->ops = scan_ops;
+
+ /*
+ * Traverse the list of registered mports to attach this new scan.
+ *
+ * The new scan with matching mport ID overrides any previously attached
+ * scan assuming that old scan (if any) is the default one (based on the
+ * enumerator registration check above).
+ * If the new scan is the global one, it will be attached only to mports
+ * that do not have their own individual operations already attached.
+ */
+ list_for_each_entry(port, &rio_mports, node) {
+ if (port->id == mport_id) {
+ port->nscan = scan_ops;
+ break;
+ } else if (mport_id == RIO_MPORT_ANY && !port->nscan)
+ port->nscan = scan_ops;
+ }
+
+ list_add_tail(&scan->node, &rio_scans);
+
+err_out:
+ mutex_unlock(&rio_mport_list_lock);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(rio_register_scan);
+
+/**
+ * rio_unregister_scan - removes enumeration/discovery method from mport
+ * @mport_id: mport device ID for which fabric scan routine has to be
+ * unregistered (RIO_MPORT_ANY = apply to all mports that use
+ * the specified scan_ops)
+ * @scan_ops: enumeration/discovery operations structure
+ *
+ * Removes enumeration or discovery method assigned to the specified mport
+ * device. If RIO_MPORT_ANY is specified, removes the specified operations from
+ * all mports that have them attached.
+ */
+int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops)
+{
+ struct rio_mport *port;
+ struct rio_scan_node *scan;
+
+ pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
+
+ if (mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS)
+ return -EINVAL;
+
+ mutex_lock(&rio_mport_list_lock);
+
+ list_for_each_entry(port, &rio_mports, node)
+ if (port->id == mport_id ||
+ (mport_id == RIO_MPORT_ANY && port->nscan == scan_ops))
+ port->nscan = NULL;
+
+ list_for_each_entry(scan, &rio_scans, node) {
+ if (scan->mport_id == mport_id) {
+ list_del(&scan->node);
+ kfree(scan);
+ break;
+ }
+ }
+
+ mutex_unlock(&rio_mport_list_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rio_unregister_scan);
+
+/**
+ * rio_mport_scan - execute enumeration/discovery on the specified mport
+ * @mport_id: number (ID) of mport device
+ */
+int rio_mport_scan(int mport_id)
+{
+ struct rio_mport *port = NULL;
+ int rc;
+
+ mutex_lock(&rio_mport_list_lock);
+ list_for_each_entry(port, &rio_mports, node) {
+ if (port->id == mport_id)
+ goto found;
+ }
+ mutex_unlock(&rio_mport_list_lock);
+ return -ENODEV;
+found:
+ if (!port->nscan) {
+ mutex_unlock(&rio_mport_list_lock);
+ return -EINVAL;
+ }
+
+ if (!try_module_get(port->nscan->owner)) {
+ mutex_unlock(&rio_mport_list_lock);
+ return -ENODEV;
+ }
+
+ mutex_unlock(&rio_mport_list_lock);
+
+ if (port->host_deviceid >= 0)
+ rc = port->nscan->enumerate(port, 0);
+ else
+ rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT);
+
+ module_put(port->nscan->owner);
+ return rc;
+}
+
+static void rio_fixup_device(struct rio_dev *dev)
+{
+}
+
+static int 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;
+}
+
+static struct workqueue_struct *rio_wq;
+
+struct rio_disc_work {
+ struct work_struct work;
+ struct rio_mport *mport;
+};
+
+static void disc_work_handler(struct work_struct *_work)
+{
+ struct rio_disc_work *work;
+
+ work = container_of(_work, struct rio_disc_work, work);
+ pr_debug("RIO: discovery work for mport %d %s\n",
+ work->mport->id, work->mport->name);
+ if (try_module_get(work->mport->nscan->owner)) {
+ work->mport->nscan->discover(work->mport, 0);
+ module_put(work->mport->nscan->owner);
+ }
+}
+
+int rio_init_mports(void)
+{
+ struct rio_mport *port;
+ struct rio_disc_work *work;
+ int n = 0;
+
+ if (!next_portid)
+ return -ENODEV;
+
+ /*
+ * First, run enumerations and check if we need to perform discovery
+ * on any of the registered mports.
+ */
+ mutex_lock(&rio_mport_list_lock);
+ list_for_each_entry(port, &rio_mports, node) {
+ if (port->host_deviceid >= 0) {
+ if (port->nscan && try_module_get(port->nscan->owner)) {
+ port->nscan->enumerate(port, 0);
+ module_put(port->nscan->owner);
+ }
+ } else
+ n++;
+ }
+ mutex_unlock(&rio_mport_list_lock);
+
+ if (!n)
+ goto no_disc;
+
+ /*
+ * If we have mports that require discovery schedule a discovery work
+ * for each of them. If the code below fails to allocate needed
+ * resources, exit without error to keep results of enumeration
+ * process (if any).
+ * TODO: Implement restart of discovery process for all or
+ * individual discovering mports.
+ */
+ rio_wq = alloc_workqueue("riodisc", 0, 0);
+ if (!rio_wq) {
+ pr_err("RIO: unable allocate rio_wq\n");
+ goto no_disc;
+ }
+
+ work = kcalloc(n, sizeof *work, GFP_KERNEL);
+ if (!work) {
+ pr_err("RIO: no memory for work struct\n");
+ destroy_workqueue(rio_wq);
+ goto no_disc;
+ }
+
+ n = 0;
+ mutex_lock(&rio_mport_list_lock);
+ list_for_each_entry(port, &rio_mports, node) {
+ if (port->host_deviceid < 0 && port->nscan) {
+ work[n].mport = port;
+ INIT_WORK(&work[n].work, disc_work_handler);
+ queue_work(rio_wq, &work[n].work);
+ n++;
+ }
+ }
+
+ flush_workqueue(rio_wq);
+ mutex_unlock(&rio_mport_list_lock);
+ pr_debug("RIO: destroy discovery workqueue\n");
+ destroy_workqueue(rio_wq);
+ kfree(work);
+
+no_disc:
+ rio_init();
+
+ return 0;
+}
+
+static int rio_get_hdid(int index)
+{
+ if (ids_num == 0 || ids_num <= index || index >= RIO_MAX_MPORTS)
+ return -1;
+
+ return hdid[index];
+}
+
+int rio_register_mport(struct rio_mport *port)
+{
+ struct rio_scan_node *scan = NULL;
+ int res = 0;
+
+ if (next_portid >= RIO_MAX_MPORTS) {
+ pr_err("RIO: reached specified max number of mports\n");
+ return 1;
+ }
+
+ port->id = next_portid++;
+ port->host_deviceid = rio_get_hdid(port->id);
+ port->nscan = NULL;
+
+ dev_set_name(&port->dev, "rapidio%d", port->id);
+ port->dev.class = &rio_mport_class;
+
+ res = device_register(&port->dev);
+ if (res)
+ dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n",
+ port->id, res);
+ else
+ dev_dbg(&port->dev, "RIO: mport%d registered\n", port->id);
+
+ mutex_lock(&rio_mport_list_lock);
+ list_add_tail(&port->node, &rio_mports);
+
+ /*
+ * Check if there are any registered enumeration/discovery operations
+ * that have to be attached to the added mport.
+ */
+ list_for_each_entry(scan, &rio_scans, node) {
+ if (port->id == scan->mport_id ||
+ scan->mport_id == RIO_MPORT_ANY) {
+ port->nscan = scan->ops;
+ if (port->id == scan->mport_id)
+ break;
+ }
+ }
+ mutex_unlock(&rio_mport_list_lock);
+
+ pr_debug("RIO: %s %s id=%d\n", __func__, port->name, port->id);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rio_register_mport);
+
+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);
+EXPORT_SYMBOL_GPL(rio_init_mports);
Code Review / kvmfornfv.git / blobdiff