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>

1 files changed, 328 insertions, 0 deletions

diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index 67a379216959..8fa732e46bf6 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 @@ int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
 }
 
 /**
+ * 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),
+                                 &regval);
+        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,
+                                                 &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
@@ -472,6 +799,7 @@ int rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
                                 RIO_STD_RTE_CONF_PORT_SEL_CSR,
                                 (u32)route_port);
         }
+
         udelay(10);
         return 0;
 }