| /* |
| * 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; |
| |
| /** |
| * 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_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), |
| ®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; |
| } |
| |
| /** |
| * 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), |
| ®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) */ |
| |
| 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); |
| } |
| } |
| |
| /** |
| * 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; |
| } |
| |
| 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; |
| } |
| |
| int __devinit rio_init_mports(void) |
| { |
| int rc = 0; |
| struct rio_mport *port; |
| |
| list_for_each_entry(port, &rio_mports, node) { |
| if (!request_mem_region(port->iores.start, |
| resource_size(&port->iores), |
| port->name)) { |
| printk(KERN_ERR |
| "RIO: Error requesting master port region 0x%016llx-0x%016llx\n", |
| (u64)port->iores.start, (u64)port->iores.end); |
| rc = -ENOMEM; |
| goto out; |
| } |
| |
| if (port->host_deviceid >= 0) |
| rio_enum_mport(port); |
| else |
| rio_disc_mport(port); |
| } |
| |
| rio_init(); |
| |
| out: |
| return rc; |
| } |
| |
| 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); |
| |
| void rio_register_mport(struct rio_mport *port) |
| { |
| if (next_portid >= RIO_MAX_MPORTS) { |
| pr_err("RIO: reached specified max number of mports\n"); |
| return; |
| } |
| |
| port->id = next_portid++; |
| port->host_deviceid = rio_get_hdid(port->id); |
| list_add_tail(&port->node, &rio_mports); |
| } |
| |
| EXPORT_SYMBOL_GPL(rio_local_get_device_id); |
| EXPORT_SYMBOL_GPL(rio_get_device); |
| EXPORT_SYMBOL_GPL(rio_get_asm); |
| EXPORT_SYMBOL_GPL(rio_request_inb_dbell); |
| EXPORT_SYMBOL_GPL(rio_release_inb_dbell); |
| EXPORT_SYMBOL_GPL(rio_request_outb_dbell); |
| EXPORT_SYMBOL_GPL(rio_release_outb_dbell); |
| EXPORT_SYMBOL_GPL(rio_request_inb_mbox); |
| EXPORT_SYMBOL_GPL(rio_release_inb_mbox); |
| EXPORT_SYMBOL_GPL(rio_request_outb_mbox); |
| EXPORT_SYMBOL_GPL(rio_release_outb_mbox); |