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Date: Wed, 24 Feb 2010 10:34:43 -0500
From: Alexandre Bounine <alexb@...dra.com>
To: mporter@...nel.crashing.org
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
thomas.moll@...go.com, thomas.moll.ext@....com, abounine@....com
Subject: [PATCH 6/7] RapidIO: Add RX/TX enable for SRIO port
From: Thomas Moll <thomas.moll@...go.com>
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@...go.com>
---
drivers/rapidio/Kconfig | 11 ++++++
drivers/rapidio/rio-scan.c | 79 ++++++++++++++++++++++++++++++++++++++++++++-
include/linux/rio_regs.h | 5 ++
3 files changed, 94 insertions(+), 1 deletion(-)
diff -purN linux-base/drivers/rapidio/Kconfig linux-new/drivers/rapidio/Kconfig
--- linux-base/drivers/rapidio/Kconfig 2010-02-22 10:44:47.000000000 +0100
+++ linux-new/drivers/rapidio/Kconfig 2010-02-22 12:36:20.000000000 +0100
@@ -8,3 +8,14 @@ config RAPIDIO_DISC_TIMEOUT
---help---
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.
diff -purN linux-base/drivers/rapidio/rio-scan.c linux-new/drivers/rapidio/rio-scan.c
--- linux-base/drivers/rapidio/rio-scan.c 2010-02-22 10:48:15.000000000 +0100
+++ linux-new/drivers/rapidio/rio-scan.c 2010-02-22 13:42:08.000000000 +0100
@@ -8,6 +8,10 @@
* Alex Bounine <alexandre.bounine@....com>
* - Added Port-Write/Error Management initialization and handling
*
+ * Copyright 2009 Sysgo AG
+ * Thomas Moll <thomas.moll@...go.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(stru
}
/**
+ * 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),
+ ®val);
+ } else {
+ if (rio_mport_read_config_32(port, destid, hopcount,
+ ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 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_set
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;
@@ -740,6 +808,11 @@ static int __devinit rio_enum_peer(struc
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;
@@ -1085,6 +1158,10 @@ int __devinit rio_enum_mport(struct rio_
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
diff -purN linux-base/include/linux/rio_regs.h linux-new/include/linux/rio_regs.h
--- linux-base/include/linux/rio_regs.h 2010-02-22 10:48:15.000000000 +0100
+++ linux-new/include/linux/rio_regs.h 2010-02-22 12:38:57.000000000 +0100
@@ -242,7 +242,12 @@
#define RIO_PORT_N_CTL_PWIDTH 0xc0000000
#define RIO_PORT_N_CTL_PWIDTH_1 0x00000000
#define RIO_PORT_N_CTL_PWIDTH_4 0x40000000
+#define RIO_PORT_N_CTL_P_TYP_SER 0x00000001
#define RIO_PORT_N_CTL_LOCKOUT 0x00000002
+#define RIO_PORT_N_CTL_EN_RX_SER 0x00200000
+#define RIO_PORT_N_CTL_EN_TX_SER 0x00400000
+#define RIO_PORT_N_CTL_EN_RX_PAR 0x08000000
+#define RIO_PORT_N_CTL_EN_TX_PAR 0x40000000
/*
* Error Management Extensions (RapidIO 1.3+, Part 8)
---
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