rapidio: add Port-Write handling for EM
Add RapidIO Port-Write message handling in the context of Error
Management Extensions Specification Rev.1.3.
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Tested-by: Thomas Moll <thomas.moll@sysgo.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index 67a3792..8fa732e 100644
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -5,6 +5,10 @@
* 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
@@ -333,6 +337,329 @@
}
/**
+ * rio_request_inb_pwrite - request inbound port-write message service
+ * @mport: 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.
+ * @rdev: RIO 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 tad 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.
+ */
+static struct rio_dev *rio_get_comptag(u32 comp_tag, 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 (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)
+{
+ u8 hopcount = 0xff;
+ u16 destid = rdev->destid;
+ u32 regval;
+
+ if (rdev->rswitch) {
+ destid = rdev->rswitch->destid;
+ hopcount = rdev->rswitch->hopcount;
+ }
+
+ rio_mport_read_config_32(rdev->net->hport, destid, hopcount,
+ 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_mport_write_config_32(rdev->net->hport, destid, hopcount,
+ rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
+ regval);
+ return 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;
+ struct rio_mport *mport;
+ u8 hopcount;
+ u16 destid;
+ u32 err_status;
+ int rc, portnum;
+
+ rdev = rio_get_comptag(pw_msg->em.comptag, NULL);
+ if (rdev == NULL) {
+ /* Someting bad here (probably enumeration error) */
+ pr_err("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",
+ i*4, pw_msg->raw[i], pw_msg->raw[i + 1],
+ pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
+ i += 4;
+ }
+ pr_debug("\n");
+ }
+#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;
+ }
+
+ /* 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;
+ }
+
+ mport = rdev->net->hport;
+ destid = rdev->rswitch->destid;
+ hopcount = rdev->rswitch->hopcount;
+
+ /*
+ * Process the port-write notification from switch
+ */
+
+ portnum = pw_msg->em.is_port & 0xFF;
+
+ if (rdev->rswitch->em_handle)
+ rdev->rswitch->em_handle(rdev, portnum);
+
+ rio_mport_read_config_32(mport, destid, hopcount,
+ 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 (pw_msg->em.errdetect) {
+ pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
+ portnum, pw_msg->em.errdetect);
+ /* Clear EM Port N Error Detect CSR */
+ rio_mport_write_config_32(mport, destid, hopcount,
+ rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
+ }
+
+ if (pw_msg->em.ltlerrdet) {
+ pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
+ pw_msg->em.ltlerrdet);
+ /* Clear EM L/T Layer Error Detect CSR */
+ rio_mport_write_config_32(mport, destid, hopcount,
+ rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
+ }
+
+ /* Clear Port Errors */
+ rio_mport_write_config_32(mport, destid, hopcount,
+ rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
+ err_status & RIO_PORT_N_ERR_STS_CLR_MASK);
+
+ if (rdev->rswitch->port_ok & (1 << portnum)) {
+ if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) {
+ rdev->rswitch->port_ok &= ~(1 << portnum);
+ rio_set_port_lockout(rdev, portnum, 1);
+
+ rio_mport_write_config_32(mport, destid, hopcount,
+ 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);
+ }
+ } else {
+ if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
+ 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 Port-Write Pending bit */
+ rio_mport_write_config_32(mport, destid, hopcount,
+ rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
+ RIO_PORT_N_ERR_STS_PW_PEND);
+
+ 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
@@ -472,6 +799,7 @@
RIO_STD_RTE_CONF_PORT_SEL_CSR,
(u32)route_port);
}
+
udelay(10);
return 0;
}