--- /dev/null
+/*
+ * RapidIO enumeration and discovery support
+ *
+ * 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
+ *
+ * Copyright 2009 Sysgo AG
+ * Thomas Moll <thomas.moll@sysgo.com>
+ * - Added Input- Output- enable functionality, to allow full communication
+ *
+ * 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/dma-mapping.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/timer.h>
+#include <linux/sched.h>
+#include <linux/jiffies.h>
+#include <linux/slab.h>
+
+#include "rio.h"
+
+static void rio_init_em(struct rio_dev *rdev);
+
+static int next_destid = 0;
+static int next_comptag = 1;
+
+static int rio_mport_phys_table[] = {
+ RIO_EFB_PAR_EP_ID,
+ RIO_EFB_PAR_EP_REC_ID,
+ RIO_EFB_SER_EP_ID,
+ RIO_EFB_SER_EP_REC_ID,
+ -1,
+};
+
+
+/**
+ * rio_destid_alloc - Allocate next available destID for given network
+ * @net: RIO network
+ *
+ * Returns next available device destination ID for the specified RIO network.
+ * Marks allocated ID as one in use.
+ * Returns RIO_INVALID_DESTID if new destID is not available.
+ */
+static u16 rio_destid_alloc(struct rio_net *net)
+{
+ int destid;
+ struct rio_id_table *idtab = &net->destid_table;
+
+ spin_lock(&idtab->lock);
+ destid = find_first_zero_bit(idtab->table, idtab->max);
+
+ if (destid < idtab->max) {
+ set_bit(destid, idtab->table);
+ destid += idtab->start;
+ } else
+ destid = RIO_INVALID_DESTID;
+
+ spin_unlock(&idtab->lock);
+ return (u16)destid;
+}
+
+/**
+ * rio_destid_reserve - Reserve the specivied destID
+ * @net: RIO network
+ * @destid: destID to reserve
+ *
+ * Tries to reserve the specified destID.
+ * Returns 0 if successfull.
+ */
+static int rio_destid_reserve(struct rio_net *net, u16 destid)
+{
+ int oldbit;
+ struct rio_id_table *idtab = &net->destid_table;
+
+ destid -= idtab->start;
+ spin_lock(&idtab->lock);
+ oldbit = test_and_set_bit(destid, idtab->table);
+ spin_unlock(&idtab->lock);
+ return oldbit;
+}
+
+/**
+ * rio_destid_free - free a previously allocated destID
+ * @net: RIO network
+ * @destid: destID to free
+ *
+ * Makes the specified destID available for use.
+ */
+static void rio_destid_free(struct rio_net *net, u16 destid)
+{
+ struct rio_id_table *idtab = &net->destid_table;
+
+ destid -= idtab->start;
+ spin_lock(&idtab->lock);
+ clear_bit(destid, idtab->table);
+ spin_unlock(&idtab->lock);
+}
+
+/**
+ * rio_destid_first - return first destID in use
+ * @net: RIO network
+ */
+static u16 rio_destid_first(struct rio_net *net)
+{
+ int destid;
+ struct rio_id_table *idtab = &net->destid_table;
+
+ spin_lock(&idtab->lock);
+ destid = find_first_bit(idtab->table, idtab->max);
+ if (destid >= idtab->max)
+ destid = RIO_INVALID_DESTID;
+ else
+ destid += idtab->start;
+ spin_unlock(&idtab->lock);
+ return (u16)destid;
+}
+
+/**
+ * rio_destid_next - return next destID in use
+ * @net: RIO network
+ * @from: destination ID from which search shall continue
+ */
+static u16 rio_destid_next(struct rio_net *net, u16 from)
+{
+ int destid;
+ struct rio_id_table *idtab = &net->destid_table;
+
+ spin_lock(&idtab->lock);
+ destid = find_next_bit(idtab->table, idtab->max, from);
+ if (destid >= idtab->max)
+ destid = RIO_INVALID_DESTID;
+ else
+ destid += idtab->start;
+ spin_unlock(&idtab->lock);
+ return (u16)destid;
+}
+
+/**
+ * rio_get_device_id - Get the base/extended device id for a device
+ * @port: RIO master port
+ * @destid: Destination ID of device
+ * @hopcount: Hopcount to device
+ *
+ * Reads the base/extended device id from a device. Returns the
+ * 8/16-bit device ID.
+ */
+static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
+{
+ u32 result;
+
+ rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
+
+ return RIO_GET_DID(port->sys_size, result);
+}
+
+/**
+ * rio_set_device_id - Set the base/extended device id for a device
+ * @port: RIO master port
+ * @destid: Destination ID of device
+ * @hopcount: Hopcount to device
+ * @did: Device ID value to be written
+ *
+ * Writes the base/extended device id from a device.
+ */
+static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
+{
+ rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
+ RIO_SET_DID(port->sys_size, did));
+}
+
+/**
+ * rio_local_set_device_id - Set the base/extended device id for a port
+ * @port: RIO master port
+ * @did: Device ID value to be written
+ *
+ * Writes the base/extended device id from a device.
+ */
+static void rio_local_set_device_id(struct rio_mport *port, u16 did)
+{
+ rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
+ did));
+}
+
+/**
+ * rio_clear_locks- Release all host locks and signal enumeration complete
+ * @net: RIO network to run on
+ *
+ * Marks the component tag CSR on each device with the enumeration
+ * complete flag. When complete, it then release the host locks on
+ * each device. Returns 0 on success or %-EINVAL on failure.
+ */
+static int rio_clear_locks(struct rio_net *net)
+{
+ struct rio_mport *port = net->hport;
+ struct rio_dev *rdev;
+ u32 result;
+ int ret = 0;
+
+ /* Release host device id locks */
+ rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
+ port->host_deviceid);
+ rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
+ if ((result & 0xffff) != 0xffff) {
+ printk(KERN_INFO
+ "RIO: badness when releasing host lock on master port, result %8.8x\n",
+ result);
+ ret = -EINVAL;
+ }
+ list_for_each_entry(rdev, &net->devices, net_list) {
+ rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
+ port->host_deviceid);
+ rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
+ if ((result & 0xffff) != 0xffff) {
+ printk(KERN_INFO
+ "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
+ rdev->vid, rdev->did);
+ ret = -EINVAL;
+ }
+
+ /* Mark device as discovered and enable master */
+ rio_read_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
+ &result);
+ result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
+ rio_write_config_32(rdev,
+ rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
+ result);
+ }
+
+ return ret;
+}
+
+/**
+ * rio_enum_host- Set host lock and initialize host destination ID
+ * @port: Master port to issue transaction
+ *
+ * Sets the local host master port lock and destination ID register
+ * with the host device ID value. The host device ID value is provided
+ * by the platform. Returns %0 on success or %-1 on failure.
+ */
+static int rio_enum_host(struct rio_mport *port)
+{
+ u32 result;
+
+ /* Set master port host device id lock */
+ rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
+ port->host_deviceid);
+
+ rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
+ if ((result & 0xffff) != port->host_deviceid)
+ return -1;
+
+ /* Set master port destid and init destid ctr */
+ rio_local_set_device_id(port, port->host_deviceid);
+ return 0;
+}
+
+/**
+ * rio_device_has_destid- Test if a device contains a destination ID register
+ * @port: Master port to issue transaction
+ * @src_ops: RIO device source operations
+ * @dst_ops: RIO device destination operations
+ *
+ * Checks the provided @src_ops and @dst_ops for the necessary transaction
+ * capabilities that indicate whether or not a device will implement a
+ * destination ID register. Returns 1 if true or 0 if false.
+ */
+static int rio_device_has_destid(struct rio_mport *port, int src_ops,
+ int dst_ops)
+{
+ u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR;
+
+ return !!((src_ops | dst_ops) & mask);
+}
+
+/**
+ * rio_release_dev- Frees a RIO device struct
+ * @dev: LDM device associated with a RIO device struct
+ *
+ * Gets the RIO device struct associated a RIO device struct.
+ * The RIO device struct is freed.
+ */
+static void rio_release_dev(struct device *dev)
+{
+ struct rio_dev *rdev;
+
+ rdev = to_rio_dev(dev);
+ kfree(rdev);
+}
+
+/**
+ * rio_is_switch- Tests if a RIO device has switch capabilities
+ * @rdev: RIO device
+ *
+ * Gets the RIO device Processing Element Features register
+ * contents and tests for switch capabilities. Returns 1 if
+ * the device is a switch or 0 if it is not a switch.
+ * The RIO device struct is freed.
+ */
+static int rio_is_switch(struct rio_dev *rdev)
+{
+ if (rdev->pef & RIO_PEF_SWITCH)
+ return 1;
+ return 0;
+}
+
+/**
+ * rio_setup_device- Allocates and sets up a RIO device
+ * @net: RIO network
+ * @port: Master port to send transactions
+ * @destid: Current destination ID
+ * @hopcount: Current hopcount
+ * @do_enum: Enumeration/Discovery mode flag
+ *
+ * Allocates a RIO device and configures fields based on configuration
+ * space contents. If device has a destination ID register, a destination
+ * ID is either assigned in enumeration mode or read from configuration
+ * space in discovery mode. If the device has switch capabilities, then
+ * a switch is allocated and configured appropriately. Returns a pointer
+ * to a RIO device on success or NULL on failure.
+ *
+ */
+static struct rio_dev *rio_setup_device(struct rio_net *net,
+ struct rio_mport *port, u16 destid,
+ u8 hopcount, int do_enum)
+{
+ int ret = 0;
+ struct rio_dev *rdev;
+ struct rio_switch *rswitch = NULL;
+ int result, rdid;
+ size_t size;
+ u32 swpinfo = 0;
+
+ size = sizeof(struct rio_dev);
+ if (rio_mport_read_config_32(port, destid, hopcount,
+ RIO_PEF_CAR, &result))
+ return NULL;
+
+ if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
+ rio_mport_read_config_32(port, destid, hopcount,
+ RIO_SWP_INFO_CAR, &swpinfo);
+ if (result & RIO_PEF_SWITCH) {
+ size += (RIO_GET_TOTAL_PORTS(swpinfo) *
+ sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
+ }
+ }
+
+ rdev = kzalloc(size, GFP_KERNEL);
+ if (!rdev)
+ return NULL;
+
+ rdev->net = net;
+ rdev->pef = result;
+ rdev->swpinfo = swpinfo;
+ rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
+ &result);
+ rdev->did = result >> 16;
+ rdev->vid = result & 0xffff;
+ rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
+ &rdev->device_rev);
+ rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
+ &result);
+ rdev->asm_did = result >> 16;
+ rdev->asm_vid = result & 0xffff;
+ rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
+ &result);
+ rdev->asm_rev = result >> 16;
+ if (rdev->pef & RIO_PEF_EXT_FEATURES) {
+ rdev->efptr = result & 0xffff;
+ rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
+ hopcount);
+
+ rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
+ hopcount, RIO_EFB_ERR_MGMNT);
+ }
+
+ rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
+ &rdev->src_ops);
+ rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
+ &rdev->dst_ops);
+
+ if (do_enum) {
+ /* Assign component tag to device */
+ if (next_comptag >= 0x10000) {
+ pr_err("RIO: Component Tag Counter Overflow\n");
+ goto cleanup;
+ }
+ rio_mport_write_config_32(port, destid, hopcount,
+ RIO_COMPONENT_TAG_CSR, next_comptag);
+ rdev->comp_tag = next_comptag++;
+ rdev->do_enum = true;
+ } else {
+ rio_mport_read_config_32(port, destid, hopcount,
+ RIO_COMPONENT_TAG_CSR,
+ &rdev->comp_tag);
+ }
+
+ if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
+ if (do_enum) {
+ rio_set_device_id(port, destid, hopcount, next_destid);
+ rdev->destid = next_destid;
+ next_destid = rio_destid_alloc(net);
+ } else
+ rdev->destid = rio_get_device_id(port, destid, hopcount);
+
+ rdev->hopcount = 0xff;
+ } else {
+ /* Switch device has an associated destID which
+ * will be adjusted later
+ */
+ rdev->destid = destid;
+ rdev->hopcount = hopcount;
+ }
+
+ /* If a PE has both switch and other functions, show it as a switch */
+ if (rio_is_switch(rdev)) {
+ rswitch = rdev->rswitch;
+ rswitch->port_ok = 0;
+ spin_lock_init(&rswitch->lock);
+ rswitch->route_table = kzalloc(sizeof(u8)*
+ RIO_MAX_ROUTE_ENTRIES(port->sys_size),
+ GFP_KERNEL);
+ if (!rswitch->route_table)
+ goto cleanup;
+ /* Initialize switch route table */
+ for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
+ rdid++)
+ rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
+ dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
+ rdev->comp_tag & RIO_CTAG_UDEVID);
+
+ if (do_enum)
+ rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
+
+ list_add_tail(&rswitch->node, &net->switches);
+
+ } else {
+ if (do_enum)
+ /*Enable Input Output Port (transmitter reviever)*/
+ rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
+
+ dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
+ rdev->comp_tag & RIO_CTAG_UDEVID);
+ }
+
+ rdev->dev.parent = &port->dev;
+ rio_attach_device(rdev);
+
+ device_initialize(&rdev->dev);
+ rdev->dev.release = rio_release_dev;
+ rio_dev_get(rdev);
+
+ rdev->dma_mask = DMA_BIT_MASK(32);
+ rdev->dev.dma_mask = &rdev->dma_mask;
+ rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
+ if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
+ rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
+ 0, 0xffff);
+
+ ret = rio_add_device(rdev);
+ if (ret)
+ goto cleanup;
+
+ return rdev;
+
+cleanup:
+ if (rswitch)
+ kfree(rswitch->route_table);
+
+ kfree(rdev);
+ return NULL;
+}
+
+/**
+ * rio_sport_is_active- Tests if a switch port has an active connection.
+ * @port: Master port to send transaction
+ * @destid: Associated destination ID for switch
+ * @hopcount: Hopcount to reach switch
+ * @sport: Switch port number
+ *
+ * Reads the port error status CSR for a particular switch port to
+ * determine if the port has an active link. Returns
+ * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
+ * inactive.
+ */
+static int
+rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
+{
+ u32 result = 0;
+ u32 ext_ftr_ptr;
+
+ ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
+
+ while (ext_ftr_ptr) {
+ rio_mport_read_config_32(port, destid, hopcount,
+ ext_ftr_ptr, &result);
+ result = RIO_GET_BLOCK_ID(result);
+ if ((result == RIO_EFB_SER_EP_FREE_ID) ||
+ (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
+ (result == RIO_EFB_SER_EP_FREC_ID))
+ break;
+
+ ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
+ ext_ftr_ptr);
+ }
+
+ if (ext_ftr_ptr)
+ rio_mport_read_config_32(port, destid, hopcount,
+ ext_ftr_ptr +
+ RIO_PORT_N_ERR_STS_CSR(sport),
+ &result);
+
+ return result & RIO_PORT_N_ERR_STS_PORT_OK;
+}
+
+/**
+ * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
+ * @port: Master port to send transaction
+ * @hopcount: Number of hops to the device
+ *
+ * Used during enumeration to read the Host Device ID Lock CSR on a
+ * RIO device. Returns the value of the lock register.
+ */
+static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
+{
+ u32 result;
+
+ rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
+ RIO_HOST_DID_LOCK_CSR, &result);
+
+ return (u16) (result & 0xffff);
+}
+
+/**
+ * rio_enum_peer- Recursively enumerate a RIO network through a master port
+ * @net: RIO network being enumerated
+ * @port: Master port to send transactions
+ * @hopcount: Number of hops into the network
+ * @prev: Previous RIO device connected to the enumerated one
+ * @prev_port: Port on previous RIO device
+ *
+ * Recursively enumerates a RIO network. Transactions are sent via the
+ * master port passed in @port.
+ */
+static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
+ u8 hopcount, struct rio_dev *prev, int prev_port)
+{
+ struct rio_dev *rdev;
+ u32 regval;
+ int tmp;
+
+ if (rio_mport_chk_dev_access(port,
+ RIO_ANY_DESTID(port->sys_size), hopcount)) {
+ pr_debug("RIO: device access check failed\n");
+ return -1;
+ }
+
+ if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
+ pr_debug("RIO: PE already discovered by this host\n");
+ /*
+ * Already discovered by this host. Add it as another
+ * link to the existing device.
+ */
+ rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
+ hopcount, RIO_COMPONENT_TAG_CSR, ®val);
+
+ if (regval) {
+ rdev = rio_get_comptag((regval & 0xffff), NULL);
+
+ if (rdev && prev && rio_is_switch(prev)) {
+ pr_debug("RIO: redundant path to %s\n",
+ rio_name(rdev));
+ prev->rswitch->nextdev[prev_port] = rdev;
+ }
+ }
+
+ return 0;
+ }
+
+ /* Attempt to acquire device lock */
+ rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
+ hopcount,
+ RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
+ while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
+ < port->host_deviceid) {
+ /* Delay a bit */
+ mdelay(1);
+ /* Attempt to acquire device lock again */
+ rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
+ hopcount,
+ RIO_HOST_DID_LOCK_CSR,
+ port->host_deviceid);
+ }
+
+ if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
+ pr_debug(
+ "RIO: PE locked by a higher priority host...retreating\n");
+ return -1;
+ }
+
+ /* Setup new RIO device */
+ rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
+ hopcount, 1);
+ if (rdev) {
+ /* Add device to the global and bus/net specific list. */
+ list_add_tail(&rdev->net_list, &net->devices);
+ rdev->prev = prev;
+ if (prev && rio_is_switch(prev))
+ prev->rswitch->nextdev[prev_port] = rdev;
+ } else
+ return -1;
+
+ if (rio_is_switch(rdev)) {
+ int sw_destid;
+ int cur_destid;
+ int sw_inport;
+ u16 destid;
+ int port_num;
+
+ sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
+ rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
+ port->host_deviceid, sw_inport, 0);
+ rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
+
+ destid = rio_destid_first(net);
+ while (destid != RIO_INVALID_DESTID && destid < next_destid) {
+ if (destid != port->host_deviceid) {
+ rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
+ destid, sw_inport, 0);
+ rdev->rswitch->route_table[destid] = sw_inport;
+ }
+ destid = rio_destid_next(net, destid + 1);
+ }
+ pr_debug(
+ "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
+ rio_name(rdev), rdev->vid, rdev->did,
+ RIO_GET_TOTAL_PORTS(rdev->swpinfo));
+ sw_destid = next_destid;
+ for (port_num = 0;
+ port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
+ port_num++) {
+ if (sw_inport == port_num) {
+ rio_enable_rx_tx_port(port, 0,
+ RIO_ANY_DESTID(port->sys_size),
+ hopcount, port_num);
+ rdev->rswitch->port_ok |= (1 << port_num);
+ continue;
+ }
+
+ cur_destid = next_destid;
+
+ if (rio_sport_is_active
+ (port, RIO_ANY_DESTID(port->sys_size), hopcount,
+ port_num)) {
+ pr_debug(
+ "RIO: scanning device on port %d\n",
+ port_num);
+ rio_enable_rx_tx_port(port, 0,
+ RIO_ANY_DESTID(port->sys_size),
+ hopcount, port_num);
+ rdev->rswitch->port_ok |= (1 << port_num);
+ rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
+ RIO_ANY_DESTID(port->sys_size),
+ port_num, 0);
+
+ if (rio_enum_peer(net, port, hopcount + 1,
+ rdev, port_num) < 0)
+ return -1;
+
+ /* Update routing tables */
+ destid = rio_destid_next(net, cur_destid + 1);
+ if (destid != RIO_INVALID_DESTID) {
+ for (destid = cur_destid;
+ destid < next_destid;) {
+ if (destid != port->host_deviceid) {
+ rio_route_add_entry(rdev,
+ RIO_GLOBAL_TABLE,
+ destid,
+ port_num,
+ 0);
+ rdev->rswitch->
+ route_table[destid] =
+ port_num;
+ }
+ destid = rio_destid_next(net,
+ destid + 1);
+ }
+ }
+ } else {
+ /* If switch supports Error Management,
+ * set PORT_LOCKOUT bit for unused port
+ */
+ if (rdev->em_efptr)
+ rio_set_port_lockout(rdev, port_num, 1);
+
+ rdev->rswitch->port_ok &= ~(1 << port_num);
+ }
+ }
+
+ /* Direct Port-write messages to the enumeratiing host */
+ if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
+ (rdev->em_efptr)) {
+ rio_write_config_32(rdev,
+ rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
+ (port->host_deviceid << 16) |
+ (port->sys_size << 15));
+ }
+
+ rio_init_em(rdev);
+
+ /* Check for empty switch */
+ if (next_destid == sw_destid)
+ next_destid = rio_destid_alloc(net);
+
+ rdev->destid = sw_destid;
+ } else
+ pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
+ rio_name(rdev), rdev->vid, rdev->did);
+
+ return 0;
+}
+
+/**
+ * rio_enum_complete- Tests if enumeration of a network is complete
+ * @port: Master port to send transaction
+ *
+ * Tests the PGCCSR discovered bit for non-zero value (enumeration
+ * complete flag). Return %1 if enumeration is complete or %0 if
+ * enumeration is incomplete.
+ */
+static int rio_enum_complete(struct rio_mport *port)
+{
+ u32 regval;
+
+ rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
+ ®val);
+ return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
+}
+
+/**
+ * rio_disc_peer- Recursively discovers a RIO network through a master port
+ * @net: RIO network being discovered
+ * @port: Master port to send transactions
+ * @destid: Current destination ID in network
+ * @hopcount: Number of hops into the network
+ * @prev: previous rio_dev
+ * @prev_port: previous port number
+ *
+ * Recursively discovers a RIO network. Transactions are sent via the
+ * master port passed in @port.
+ */
+static int
+rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
+ u8 hopcount, struct rio_dev *prev, int prev_port)
+{
+ u8 port_num, route_port;
+ struct rio_dev *rdev;
+ u16 ndestid;
+
+ /* Setup new RIO device */
+ if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
+ /* Add device to the global and bus/net specific list. */
+ list_add_tail(&rdev->net_list, &net->devices);
+ rdev->prev = prev;
+ if (prev && rio_is_switch(prev))
+ prev->rswitch->nextdev[prev_port] = rdev;
+ } else
+ return -1;
+
+ if (rio_is_switch(rdev)) {
+ /* Associated destid is how we accessed this switch */
+ rdev->destid = destid;
+
+ pr_debug(
+ "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
+ rio_name(rdev), rdev->vid, rdev->did,
+ RIO_GET_TOTAL_PORTS(rdev->swpinfo));
+ for (port_num = 0;
+ port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
+ port_num++) {
+ if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
+ continue;
+
+ if (rio_sport_is_active
+ (port, destid, hopcount, port_num)) {
+ pr_debug(
+ "RIO: scanning device on port %d\n",
+ port_num);
+
+ rio_lock_device(port, destid, hopcount, 1000);
+
+ for (ndestid = 0;
+ ndestid < RIO_ANY_DESTID(port->sys_size);
+ ndestid++) {
+ rio_route_get_entry(rdev,
+ RIO_GLOBAL_TABLE,
+ ndestid,
+ &route_port, 0);
+ if (route_port == port_num)
+ break;
+ }
+
+ if (ndestid == RIO_ANY_DESTID(port->sys_size))
+ continue;
+ rio_unlock_device(port, destid, hopcount);
+ if (rio_disc_peer(net, port, ndestid,
+ hopcount + 1, rdev, port_num) < 0)
+ return -1;
+ }
+ }
+ } else
+ pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
+ rio_name(rdev), rdev->vid, rdev->did);
+
+ return 0;
+}
+
+/**
+ * rio_mport_is_active- Tests if master port link is active
+ * @port: Master port to test
+ *
+ * Reads the port error status CSR for the master port to
+ * determine if the port has an active link. Returns
+ * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
+ * or %0 if it is inactive.
+ */
+static int rio_mport_is_active(struct rio_mport *port)
+{
+ u32 result = 0;
+ u32 ext_ftr_ptr;
+ int *entry = rio_mport_phys_table;
+
+ do {
+ if ((ext_ftr_ptr =
+ rio_mport_get_feature(port, 1, 0, 0, *entry)))
+ break;
+ } while (*++entry >= 0);
+
+ if (ext_ftr_ptr)
+ rio_local_read_config_32(port,
+ ext_ftr_ptr +
+ RIO_PORT_N_ERR_STS_CSR(port->index),
+ &result);
+
+ return result & RIO_PORT_N_ERR_STS_PORT_OK;
+}
+
+/**
+ * rio_alloc_net- Allocate and configure a new RIO network
+ * @port: Master port associated with the RIO network
+ * @do_enum: Enumeration/Discovery mode flag
+ * @start: logical minimal start id for new net
+ *
+ * Allocates a RIO network structure, initializes per-network
+ * list heads, and adds the associated master port to the
+ * network list of associated master ports. Returns a
+ * RIO network pointer on success or %NULL on failure.
+ */
+static struct rio_net *rio_alloc_net(struct rio_mport *port,
+ int do_enum, u16 start)
+{
+ struct rio_net *net;
+
+ net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
+ if (net && do_enum) {
+ net->destid_table.table = kcalloc(
+ BITS_TO_LONGS(RIO_MAX_ROUTE_ENTRIES(port->sys_size)),
+ sizeof(long),
+ GFP_KERNEL);
+
+ if (net->destid_table.table == NULL) {
+ pr_err("RIO: failed to allocate destID table\n");
+ kfree(net);
+ net = NULL;
+ } else {
+ net->destid_table.start = start;
+ net->destid_table.max =
+ RIO_MAX_ROUTE_ENTRIES(port->sys_size);
+ spin_lock_init(&net->destid_table.lock);
+ }
+ }
+
+ if (net) {
+ INIT_LIST_HEAD(&net->node);
+ INIT_LIST_HEAD(&net->devices);
+ INIT_LIST_HEAD(&net->switches);
+ INIT_LIST_HEAD(&net->mports);
+ list_add_tail(&port->nnode, &net->mports);
+ net->hport = port;
+ net->id = port->id;
+ }
+ return net;
+}
+
+/**
+ * rio_update_route_tables- Updates route tables in switches
+ * @net: RIO network to run update on
+ *
+ * For each enumerated device, ensure that each switch in a system
+ * has correct routing entries. Add routes for devices that where
+ * unknown dirung the first enumeration pass through the switch.
+ */
+static void rio_update_route_tables(struct rio_net *net)
+{
+ struct rio_dev *rdev, *swrdev;
+ struct rio_switch *rswitch;
+ u8 sport;
+ u16 destid;
+
+ list_for_each_entry(rdev, &net->devices, net_list) {
+
+ destid = rdev->destid;
+
+ list_for_each_entry(rswitch, &net->switches, node) {
+
+ if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
+ continue;
+
+ if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
+ swrdev = sw_to_rio_dev(rswitch);
+
+ /* Skip if destid ends in empty switch*/
+ if (swrdev->destid == destid)
+ continue;
+
+ sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
+
+ rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
+ destid, sport, 0);
+ rswitch->route_table[destid] = sport;
+ }
+ }
+ }
+}
+
+/**
+ * rio_init_em - Initializes RIO Error Management (for switches)
+ * @rdev: RIO device
+ *
+ * For each enumerated switch, call device-specific error management
+ * initialization routine (if supplied by the switch driver).
+ */
+static void rio_init_em(struct rio_dev *rdev)
+{
+ if (rio_is_switch(rdev) && (rdev->em_efptr) &&
+ rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
+ rdev->rswitch->ops->em_init(rdev);
+ }
+}
+
+/**
+ * rio_pw_enable - Enables/disables port-write handling by a master port
+ * @port: Master port associated with port-write handling
+ * @enable: 1=enable, 0=disable
+ */
+static void rio_pw_enable(struct rio_mport *port, int enable)
+{
+ if (port->ops->pwenable)
+ port->ops->pwenable(port, enable);
+}
+
+/**
+ * rio_enum_mport- Start enumeration through a master port
+ * @mport: Master port to send transactions
+ * @flags: Enumeration control flags
+ *
+ * Starts the enumeration process. If somebody has enumerated our
+ * master port device, then give up. If not and we have an active
+ * link, then start recursive peer enumeration. Returns %0 if
+ * enumeration succeeds or %-EBUSY if enumeration fails.
+ */
+static int rio_enum_mport(struct rio_mport *mport, u32 flags)
+{
+ struct rio_net *net = NULL;
+ int rc = 0;
+
+ printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
+ mport->name);
+
+ /*
+ * To avoid multiple start requests (repeat enumeration is not supported
+ * by this method) check if enumeration/discovery was performed for this
+ * mport: if mport was added into the list of mports for a net exit
+ * with error.
+ */
+ if (mport->nnode.next || mport->nnode.prev)
+ return -EBUSY;
+
+ /* If somebody else enumerated our master port device, bail. */
+ if (rio_enum_host(mport) < 0) {
+ printk(KERN_INFO
+ "RIO: master port %d device has been enumerated by a remote host\n",
+ mport->id);
+ rc = -EBUSY;
+ goto out;
+ }
+
+ /* If master port has an active link, allocate net and enum peers */
+ if (rio_mport_is_active(mport)) {
+ net = rio_alloc_net(mport, 1, 0);
+ if (!net) {
+ printk(KERN_ERR "RIO: failed to allocate new net\n");
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ /* reserve mport destID in new net */
+ rio_destid_reserve(net, mport->host_deviceid);
+
+ /* Enable Input Output Port (transmitter reviever) */
+ rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
+
+ /* Set component tag for host */
+ rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
+ next_comptag++);
+
+ next_destid = rio_destid_alloc(net);
+
+ if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
+ /* A higher priority host won enumeration, bail. */
+ printk(KERN_INFO
+ "RIO: master port %d device has lost enumeration to a remote host\n",
+ mport->id);
+ rio_clear_locks(net);
+ rc = -EBUSY;
+ goto out;
+ }
+ /* free the last allocated destID (unused) */
+ rio_destid_free(net, next_destid);
+ rio_update_route_tables(net);
+ rio_clear_locks(net);
+ rio_pw_enable(mport, 1);
+ } else {
+ printk(KERN_INFO "RIO: master port %d link inactive\n",
+ mport->id);
+ rc = -EINVAL;
+ }
+
+ out:
+ return rc;
+}
+
+/**
+ * rio_build_route_tables- Generate route tables from switch route entries
+ * @net: RIO network to run route tables scan on
+ *
+ * For each switch device, generate a route table by copying existing
+ * route entries from the switch.
+ */
+static void rio_build_route_tables(struct rio_net *net)
+{
+ struct rio_switch *rswitch;
+ struct rio_dev *rdev;
+ int i;
+ u8 sport;
+
+ list_for_each_entry(rswitch, &net->switches, node) {
+ rdev = sw_to_rio_dev(rswitch);
+
+ rio_lock_device(net->hport, rdev->destid,
+ rdev->hopcount, 1000);
+ for (i = 0;
+ i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
+ i++) {
+ if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
+ i, &sport, 0) < 0)
+ continue;
+ rswitch->route_table[i] = sport;
+ }
+
+ rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
+ }
+}
+
+/**
+ * rio_disc_mport- Start discovery through a master port
+ * @mport: Master port to send transactions
+ * @flags: discovery control flags
+ *
+ * Starts the discovery process. If we have an active link,
+ * then wait for the signal that enumeration is complete (if wait
+ * is allowed).
+ * When enumeration completion is signaled, start recursive
+ * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
+ * on failure.
+ */
+static int rio_disc_mport(struct rio_mport *mport, u32 flags)
+{
+ struct rio_net *net = NULL;
+ unsigned long to_end;
+
+ printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
+ mport->name);
+
+ /* If master port has an active link, allocate net and discover peers */
+ if (rio_mport_is_active(mport)) {
+ if (rio_enum_complete(mport))
+ goto enum_done;
+ else if (flags & RIO_SCAN_ENUM_NO_WAIT)
+ return -EAGAIN;
+
+ pr_debug("RIO: wait for enumeration to complete...\n");
+
+ to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
+ while (time_before(jiffies, to_end)) {
+ if (rio_enum_complete(mport))
+ goto enum_done;
+ msleep(10);
+ }
+
+ pr_debug("RIO: discovery timeout on mport %d %s\n",
+ mport->id, mport->name);
+ goto bail;
+enum_done:
+ pr_debug("RIO: ... enumeration done\n");
+
+ net = rio_alloc_net(mport, 0, 0);
+ if (!net) {
+ printk(KERN_ERR "RIO: Failed to allocate new net\n");
+ goto bail;
+ }
+
+ /* Read DestID assigned by enumerator */
+ rio_local_read_config_32(mport, RIO_DID_CSR,
+ &mport->host_deviceid);
+ mport->host_deviceid = RIO_GET_DID(mport->sys_size,
+ mport->host_deviceid);
+
+ if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
+ 0, NULL, 0) < 0) {
+ printk(KERN_INFO
+ "RIO: master port %d device has failed discovery\n",
+ mport->id);
+ goto bail;
+ }
+
+ rio_build_route_tables(net);
+ }
+
+ return 0;
+bail:
+ return -EBUSY;
+}
+
+static struct rio_scan rio_scan_ops = {
+ .owner = THIS_MODULE,
+ .enumerate = rio_enum_mport,
+ .discover = rio_disc_mport,
+};
+
+static bool scan;
+module_param(scan, bool, 0);
+MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
+ "(default = 0)");
+
+/**
+ * rio_basic_attach:
+ *
+ * When this enumeration/discovery method is loaded as a module this function
+ * registers its specific enumeration and discover routines for all available
+ * RapidIO mport devices. The "scan" command line parameter controls ability of
+ * the module to start RapidIO enumeration/discovery automatically.
+ *
+ * Returns 0 for success or -EIO if unable to register itself.
+ *
+ * This enumeration/discovery method cannot be unloaded and therefore does not
+ * provide a matching cleanup_module routine.
+ */
+
+static int __init rio_basic_attach(void)
+{
+ if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
+ return -EIO;
+ if (scan)
+ rio_init_mports();
+ return 0;
+}
+
+late_initcall(rio_basic_attach);
+
+MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff