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linux/drivers/rapidio/rio.c
Alexandre Bounine 2574740d1f rapidio: update asynchronous discovery initialization 
Update discovery process initialization based on Andrew Morton's comments:
https://lkml.org/lkml/2012/10/3/552.

This update processes all enumerating mports first and schedules discovery
work after that. If the initialization routine fails to allocate resources
needed to execute discovery, it abandons discovery for all ports.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-11 08:50:15 +09:00

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/*
* RapidIO interconnect services
* (RapidIO Interconnect Specification, http://www.rapidio.org)
*
* Copyright 2005 MontaVista Software, Inc.
* Matt Porter <mporter@kernel.crashing.org>
*
* Copyright 2009 Integrated Device Technology, Inc.
* Alex Bounine <alexandre.bounine@idt.com>
* - Added Port-Write/Error Management initialization and handling
*
* 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"
static LIST_HEAD(rio_mports);
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_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.
* @lstart: 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;
}
/**
* 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;
}
/**
* 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),
&regval);
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;
}
/**
* 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;
}
/**
* 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),
&regval);
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),
&regval);
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, &regval)) {
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),
&regval);
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->em_handle)
rdev->rswitch->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,
&reg_val);
else
rio_mport_read_config_32(port, destid, hopcount,
RIO_ASM_INFO_CAR, &reg_val);
return reg_val & RIO_EXT_FTR_PTR_MASK;
} else {
if (local)
rio_local_read_config_32(port, from, &reg_val);
else
rio_mport_read_config_32(port, destid, hopcount,
from, &reg_val);
return RIO_GET_BLOCK_ID(reg_val);
}
}
/**
* 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);
}
/**
* 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
*/
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
*/
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)
*/
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;
}
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
static bool rio_chan_filter(struct dma_chan *chan, void *arg)
{
struct rio_dev *rdev = arg;
/* Check that DMA device belongs to the right MPORT */
return (rdev->net->hport ==
container_of(chan->device, struct rio_mport, dma));
}
/**
* rio_request_dma - request RapidIO capable DMA channel that supports
* specified target RapidIO device.
* @rdev: RIO device control structure
*
* Returns pointer to allocated DMA channel or NULL if failed.
*/
struct dma_chan *rio_request_dma(struct rio_dev *rdev)
{
dma_cap_mask_t mask;
struct dma_chan *dchan;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
dchan = dma_request_channel(mask, rio_chan_filter, rdev);
return dchan;
}
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_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)
{
struct dma_async_tx_descriptor *txd = NULL;
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 = rdev->destid;
rio_ext.rio_addr_u = data->rio_addr_u;
rio_ext.rio_addr = data->rio_addr;
rio_ext.wr_type = data->wr_type;
txd = dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,
direction, flags, &rio_ext);
return txd;
}
EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
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;
}
static struct workqueue_struct *rio_wq;
struct rio_disc_work {
struct work_struct work;
struct rio_mport *mport;
};
static void __devinit 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);
rio_disc_mport(work->mport);
}
int __devinit 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.
*/
list_for_each_entry(port, &rio_mports, node) {
if (port->host_deviceid >= 0)
rio_enum_mport(port);
else
n++;
}
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 dicovery 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;
list_for_each_entry(port, &rio_mports, node) {
if (port->host_deviceid < 0) {
work[n].mport = port;
INIT_WORK(&work[n].work, disc_work_handler);
queue_work(rio_wq, &work[n].work);
n++;
}
}
flush_workqueue(rio_wq);
pr_debug("RIO: destroy discovery workqueue\n");
destroy_workqueue(rio_wq);
kfree(work);
no_disc:
rio_init();
return 0;
}
device_initcall_sync(rio_init_mports);
static int hdids[RIO_MAX_MPORTS + 1];
static int rio_get_hdid(int index)
{
if (!hdids[0] || hdids[0] <= index || index >= RIO_MAX_MPORTS)
return -1;
return hdids[index + 1];
}
static int rio_hdid_setup(char *str)
{
(void)get_options(str, ARRAY_SIZE(hdids), hdids);
return 1;
}
__setup("riohdid=", rio_hdid_setup);
int rio_register_mport(struct rio_mport *port)
{
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);
list_add_tail(&port->node, &rio_mports);
return 0;
}
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);
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