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rio.c
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rio.c
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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_devices);
static DEFINE_SPINLOCK(rio_global_list_lock);
static LIST_HEAD(rio_mports);
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_switch_init - Sets switch operations for a particular vendor switch
* @rdev: RIO device
* @do_enum: Enumeration/Discovery mode flag
*
* Searches the RIO switch ops table for known switch types. If the vid
* and did match a switch table entry, then call switch initialization
* routine to setup switch-specific routines.
*/
void rio_switch_init(struct rio_dev *rdev, int do_enum)
{
struct rio_switch_ops *cur = __start_rio_switch_ops;
struct rio_switch_ops *end = __end_rio_switch_ops;
while (cur < end) {
if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
pr_debug("RIO: calling init routine for %s\n",
rio_name(rdev));
cur->init_hook(rdev, do_enum);
break;
}
cur++;
}
if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
pr_debug("RIO: adding STD routing ops for %s\n",
rio_name(rdev));
rdev->rswitch->add_entry = rio_std_route_add_entry;
rdev->rswitch->get_entry = rio_std_route_get_entry;
rdev->rswitch->clr_table = rio_std_route_clr_table;
}
if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
printk(KERN_ERR "RIO: missing routing ops for %s\n",
rio_name(rdev));
}
EXPORT_SYMBOL_GPL(rio_switch_init);
/**
* 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->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) */