rapidio: add enabling SRIO port RX and TX

Add the functionality to enable Input receiver and Output transmitter of
every port, to allow non-maintenance traffic.

Signed-off-by: Thomas Moll <thomas.moll@sysgo.com>
Signed-off-by: Alexandre Bounine <abounine@tundra.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>

2 files changed, 89 insertions, 1 deletions

diff --git a/drivers/rapidio/Kconfig b/drivers/rapidio/Kconfig
index 606cb172c1e5..bcb5c2063370 100644
--- a/drivers/rapidio/Kconfig
+++ b/drivers/rapidio/Kconfig
@@ -9,4 +9,15 @@ config RAPIDIO_DISC_TIMEOUT
           Amount of time a discovery node waits for a host to complete
           enumeration before giving up.
 
+config RAPIDIO_ENABLE_RX_TX_PORTS
+        bool "Enable RapidIO Input/Output Ports"
+        depends on RAPIDIO
+        ---help---
+          The RapidIO specification describes a Output port transmit
+          enable and a Input port receive enable. The recommended state
+          for Input ports and Output ports should be disabled. When
+          this switch is set the RapidIO subsystem will enable all
+          ports for Input/Output direction to allow other traffic
+          than Maintenance transfers.
+
 source "drivers/rapidio/switches/Kconfig"
diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c
index 74633cc6b2eb..1faa1a5756e2 100644
--- a/drivers/rapidio/rio-scan.c
+++ b/drivers/rapidio/rio-scan.c
@@ -8,6 +8,10 @@
  * 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
@@ -328,6 +332,65 @@ static int __devinit rio_add_device(struct rio_dev *rdev)
 }
 
 /**
+ * rio_enable_rx_tx_port - enable input reciever and output transmitter of
+ * given port
+ * @port: Master port associated with the RIO network
+ * @local: local=1 select local port otherwise a far device is reached
+ * @destid: Destination ID of the device to check host bit
+ * @hopcount: Number of hops to reach the target
+ * @port_num: Port (-number on switch) to enable on a far end device
+ *
+ * Returns 0 or 1 from on General Control Command and Status Register
+ * (EXT_PTR+0x3C)
+ */
+inline int rio_enable_rx_tx_port(struct rio_mport *port,
+                                 int local, u16 destid,
+                                 u8 hopcount, u8 port_num) {
+#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
+        u32 regval;
+        u32 ext_ftr_ptr;
+
+        /*
+        * enable rx input tx output port
+        */
+        pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
+                 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
+
+        ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
+
+        if (local) {
+                rio_local_read_config_32(port, ext_ftr_ptr +
+                                RIO_PORT_N_CTL_CSR(0),
+                                &regval);
+        } else {
+                if (rio_mport_read_config_32(port, destid, hopcount,
+                ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), &regval) < 0)
+                        return -EIO;
+        }
+
+        if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
+                /* serial */
+                regval = regval | RIO_PORT_N_CTL_EN_RX_SER
+                                | RIO_PORT_N_CTL_EN_TX_SER;
+        } else {
+                /* parallel */
+                regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
+                                | RIO_PORT_N_CTL_EN_TX_PAR;
+        }
+
+        if (local) {
+                rio_local_write_config_32(port, ext_ftr_ptr +
+                                          RIO_PORT_N_CTL_CSR(0), regval);
+        } else {
+                if (rio_mport_write_config_32(port, destid, hopcount,
+                    ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
+                        return -EIO;
+        }
+#endif
+        return 0;
+}
+
+/**
  * rio_setup_device- Allocates and sets up a RIO device
  * @net: RIO network
  * @port: Master port to send transactions
@@ -430,9 +493,14 @@ static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
 
                 list_add_tail(&rswitch->node, &rio_switches);
 
-        } else
+        } 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->destid);
+        }
 
         rdev->dev.bus = &rio_bus_type;
 
@@ -812,6 +880,11 @@ static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
                     rio_name(rdev), rdev->vid, rdev->did, num_ports);
                 sw_destid = next_destid;
                 for (port_num = 0; port_num < num_ports; port_num++) {
+                        /*Enable Input Output Port (transmitter reviever)*/
+                        rio_enable_rx_tx_port(port, 0,
+                                              RIO_ANY_DESTID(port->sys_size),
+                                              hopcount, port_num);
+
                         if (sw_inport == port_num) {
                                 rdev->rswitch->port_ok |= (1 << port_num);
                                 continue;
@@ -1132,6 +1205,10 @@ int __devinit rio_enum_mport(struct rio_mport *mport)
                         rc = -ENOMEM;
                         goto out;
                 }
+
+                /* Enable Input Output Port (transmitter reviever) */
+                rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
+
                 if (rio_enum_peer(net, mport, 0) < 0) {
                         /* A higher priority host won enumeration, bail. */
                         printk(KERN_INFO