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linux/drivers/rapidio/switches/tsi57x.c
Alexandre Bounine 2ec3ba69fa rapidio: convert switch drivers to modules 
Rework RapidIO switch drivers to add an option to build them as loadable
kernel modules.

This patch removes RapidIO-specific vmlinux section and converts switch
drivers to be compatible with LDM driver registration method.  To simplify
registration of device-specific callback routines this patch introduces
rio_switch_ops data structure.  The sw_sysfs() callback is removed from
the list of device-specific operations because under the new structure its
functions can be handled by switch driver's probe() and remove() routines.

If a specific switch device driver is not loaded the RapidIO subsystem
core will use default standard-based operations to configure a switch.
Because the current implementation of RapidIO enumeration/discovery method
relies on availability of device-specific operations for error management,
switch device drivers must be loaded before the RapidIO
enumeration/discovery starts.

This patch also moves several common routines from enumeration/discovery
module into the RapidIO core code to make switch-specific operations
accessible to all components of RapidIO subsystem.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@Prodrive.nl>
Cc: Micha Nelissen <micha.nelissen@Prodrive.nl>
Cc: Stef van Os <stef.van.os@Prodrive.nl>
Cc: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-03 16:08:04 -07:00

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/*
* RapidIO Tsi57x switch family support
*
* Copyright 2009-2010 Integrated Device Technology, Inc.
* Alexandre Bounine <alexandre.bounine@idt.com>
* - Added EM support
* - Modified switch operations initialization.
*
* Copyright 2005 MontaVista Software, Inc.
* Matt Porter <mporter@kernel.crashing.org>
*
* 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/rio.h>
#include <linux/rio_drv.h>
#include <linux/rio_ids.h>
#include <linux/delay.h>
#include <linux/module.h>
#include "../rio.h"
/* Global (broadcast) route registers */
#define SPBC_ROUTE_CFG_DESTID 0x10070
#define SPBC_ROUTE_CFG_PORT 0x10074
/* Per port route registers */
#define SPP_ROUTE_CFG_DESTID(n) (0x11070 + 0x100*n)
#define SPP_ROUTE_CFG_PORT(n) (0x11074 + 0x100*n)
#define TSI578_SP_MODE(n) (0x11004 + n*0x100)
#define TSI578_SP_MODE_GLBL 0x10004
#define TSI578_SP_MODE_PW_DIS 0x08000000
#define TSI578_SP_MODE_LUT_512 0x01000000
#define TSI578_SP_CTL_INDEP(n) (0x13004 + n*0x100)
#define TSI578_SP_LUT_PEINF(n) (0x13010 + n*0x100)
#define TSI578_SP_CS_TX(n) (0x13014 + n*0x100)
#define TSI578_SP_INT_STATUS(n) (0x13018 + n*0x100)
#define TSI578_GLBL_ROUTE_BASE 0x10078
static int
tsi57x_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
u16 table, u16 route_destid, u8 route_port)
{
if (table == RIO_GLOBAL_TABLE) {
rio_mport_write_config_32(mport, destid, hopcount,
SPBC_ROUTE_CFG_DESTID, route_destid);
rio_mport_write_config_32(mport, destid, hopcount,
SPBC_ROUTE_CFG_PORT, route_port);
} else {
rio_mport_write_config_32(mport, destid, hopcount,
SPP_ROUTE_CFG_DESTID(table), route_destid);
rio_mport_write_config_32(mport, destid, hopcount,
SPP_ROUTE_CFG_PORT(table), route_port);
}
udelay(10);
return 0;
}
static int
tsi57x_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
u16 table, u16 route_destid, u8 *route_port)
{
int ret = 0;
u32 result;
if (table == RIO_GLOBAL_TABLE) {
/* Use local RT of the ingress port to avoid possible
race condition */
rio_mport_read_config_32(mport, destid, hopcount,
RIO_SWP_INFO_CAR, &result);
table = (result & RIO_SWP_INFO_PORT_NUM_MASK);
}
rio_mport_write_config_32(mport, destid, hopcount,
SPP_ROUTE_CFG_DESTID(table), route_destid);
rio_mport_read_config_32(mport, destid, hopcount,
SPP_ROUTE_CFG_PORT(table), &result);
*route_port = (u8)result;
if (*route_port > 15)
ret = -1;
return ret;
}
static int
tsi57x_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
u16 table)
{
u32 route_idx;
u32 lut_size;
lut_size = (mport->sys_size) ? 0x1ff : 0xff;
if (table == RIO_GLOBAL_TABLE) {
rio_mport_write_config_32(mport, destid, hopcount,
SPBC_ROUTE_CFG_DESTID, 0x80000000);
for (route_idx = 0; route_idx <= lut_size; route_idx++)
rio_mport_write_config_32(mport, destid, hopcount,
SPBC_ROUTE_CFG_PORT,
RIO_INVALID_ROUTE);
} else {
rio_mport_write_config_32(mport, destid, hopcount,
SPP_ROUTE_CFG_DESTID(table), 0x80000000);
for (route_idx = 0; route_idx <= lut_size; route_idx++)
rio_mport_write_config_32(mport, destid, hopcount,
SPP_ROUTE_CFG_PORT(table) , RIO_INVALID_ROUTE);
}
return 0;
}
static int
tsi57x_set_domain(struct rio_mport *mport, u16 destid, u8 hopcount,
u8 sw_domain)
{
u32 regval;
/*
* Switch domain configuration operates only at global level
*/
/* Turn off flat (LUT_512) mode */
rio_mport_read_config_32(mport, destid, hopcount,
TSI578_SP_MODE_GLBL, &regval);
rio_mport_write_config_32(mport, destid, hopcount, TSI578_SP_MODE_GLBL,
regval & ~TSI578_SP_MODE_LUT_512);
/* Set switch domain base */
rio_mport_write_config_32(mport, destid, hopcount,
TSI578_GLBL_ROUTE_BASE,
(u32)(sw_domain << 24));
return 0;
}
static int
tsi57x_get_domain(struct rio_mport *mport, u16 destid, u8 hopcount,
u8 *sw_domain)
{
u32 regval;
/*
* Switch domain configuration operates only at global level
*/
rio_mport_read_config_32(mport, destid, hopcount,
TSI578_GLBL_ROUTE_BASE, &regval);
*sw_domain = (u8)(regval >> 24);
return 0;
}
static int
tsi57x_em_init(struct rio_dev *rdev)
{
u32 regval;
int portnum;
pr_debug("TSI578 %s [%d:%d]\n", __func__, rdev->destid, rdev->hopcount);
for (portnum = 0;
portnum < RIO_GET_TOTAL_PORTS(rdev->swpinfo); portnum++) {
/* Make sure that Port-Writes are enabled (for all ports) */
rio_read_config_32(rdev,
TSI578_SP_MODE(portnum), &regval);
rio_write_config_32(rdev,
TSI578_SP_MODE(portnum),
regval & ~TSI578_SP_MODE_PW_DIS);
/* Clear all pending interrupts */
rio_read_config_32(rdev,
rdev->phys_efptr +
RIO_PORT_N_ERR_STS_CSR(portnum),
&regval);
rio_write_config_32(rdev,
rdev->phys_efptr +
RIO_PORT_N_ERR_STS_CSR(portnum),
regval & 0x07120214);
rio_read_config_32(rdev,
TSI578_SP_INT_STATUS(portnum), &regval);
rio_write_config_32(rdev,
TSI578_SP_INT_STATUS(portnum),
regval & 0x000700bd);
/* Enable all interrupts to allow ports to send a port-write */
rio_read_config_32(rdev,
TSI578_SP_CTL_INDEP(portnum), &regval);
rio_write_config_32(rdev,
TSI578_SP_CTL_INDEP(portnum),
regval | 0x000b0000);
/* Skip next (odd) port if the current port is in x4 mode */
rio_read_config_32(rdev,
rdev->phys_efptr + RIO_PORT_N_CTL_CSR(portnum),
&regval);
if ((regval & RIO_PORT_N_CTL_PWIDTH) == RIO_PORT_N_CTL_PWIDTH_4)
portnum++;
}
/* set TVAL = ~50us */
rio_write_config_32(rdev,
rdev->phys_efptr + RIO_PORT_LINKTO_CTL_CSR, 0x9a << 8);
return 0;
}
static int
tsi57x_em_handler(struct rio_dev *rdev, u8 portnum)
{
struct rio_mport *mport = rdev->net->hport;
u32 intstat, err_status;
int sendcount, checkcount;
u8 route_port;
u32 regval;
rio_read_config_32(rdev,
rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
&err_status);
if ((err_status & RIO_PORT_N_ERR_STS_PORT_OK) &&
(err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
RIO_PORT_N_ERR_STS_PW_INP_ES))) {
/* Remove any queued packets by locking/unlocking port */
rio_read_config_32(rdev,
rdev->phys_efptr + RIO_PORT_N_CTL_CSR(portnum),
&regval);
if (!(regval & RIO_PORT_N_CTL_LOCKOUT)) {
rio_write_config_32(rdev,
rdev->phys_efptr + RIO_PORT_N_CTL_CSR(portnum),
regval | RIO_PORT_N_CTL_LOCKOUT);
udelay(50);
rio_write_config_32(rdev,
rdev->phys_efptr + RIO_PORT_N_CTL_CSR(portnum),
regval);
}
/* Read from link maintenance response register to clear
* valid bit
*/
rio_read_config_32(rdev,
rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(portnum),
&regval);
/* Send a Packet-Not-Accepted/Link-Request-Input-Status control
* symbol to recover from IES/OES
*/
sendcount = 3;
while (sendcount) {
rio_write_config_32(rdev,
TSI578_SP_CS_TX(portnum), 0x40fc8000);
checkcount = 3;
while (checkcount--) {
udelay(50);
rio_read_config_32(rdev,
rdev->phys_efptr +
RIO_PORT_N_MNT_RSP_CSR(portnum),
&regval);
if (regval & RIO_PORT_N_MNT_RSP_RVAL)
goto exit_es;
}
sendcount--;
}
}
exit_es:
/* Clear implementation specific error status bits */
rio_read_config_32(rdev, TSI578_SP_INT_STATUS(portnum), &intstat);
pr_debug("TSI578[%x:%x] SP%d_INT_STATUS=0x%08x\n",
rdev->destid, rdev->hopcount, portnum, intstat);
if (intstat & 0x10000) {
rio_read_config_32(rdev,
TSI578_SP_LUT_PEINF(portnum), &regval);
regval = (mport->sys_size) ? (regval >> 16) : (regval >> 24);
route_port = rdev->rswitch->route_table[regval];
pr_debug("RIO: TSI578[%s] P%d LUT Parity Error (destID=%d)\n",
rio_name(rdev), portnum, regval);
tsi57x_route_add_entry(mport, rdev->destid, rdev->hopcount,
RIO_GLOBAL_TABLE, regval, route_port);
}
rio_write_config_32(rdev, TSI578_SP_INT_STATUS(portnum),
intstat & 0x000700bd);
return 0;
}
static struct rio_switch_ops tsi57x_switch_ops = {
.owner = THIS_MODULE,
.add_entry = tsi57x_route_add_entry,
.get_entry = tsi57x_route_get_entry,
.clr_table = tsi57x_route_clr_table,
.set_domain = tsi57x_set_domain,
.get_domain = tsi57x_get_domain,
.em_init = tsi57x_em_init,
.em_handle = tsi57x_em_handler,
};
static int tsi57x_probe(struct rio_dev *rdev, const struct rio_device_id *id)
{
pr_debug("RIO: %s for %s\n", __func__, rio_name(rdev));
spin_lock(&rdev->rswitch->lock);
if (rdev->rswitch->ops) {
spin_unlock(&rdev->rswitch->lock);
return -EINVAL;
}
rdev->rswitch->ops = &tsi57x_switch_ops;
if (rdev->do_enum) {
/* Ensure that default routing is disabled on startup */
rio_write_config_32(rdev, RIO_STD_RTE_DEFAULT_PORT,
RIO_INVALID_ROUTE);
}
spin_unlock(&rdev->rswitch->lock);
return 0;
}
static void tsi57x_remove(struct rio_dev *rdev)
{
pr_debug("RIO: %s for %s\n", __func__, rio_name(rdev));
spin_lock(&rdev->rswitch->lock);
if (rdev->rswitch->ops != &tsi57x_switch_ops) {
spin_unlock(&rdev->rswitch->lock);
return;
}
rdev->rswitch->ops = NULL;
spin_unlock(&rdev->rswitch->lock);
}
static struct rio_device_id tsi57x_id_table[] = {
{RIO_DEVICE(RIO_DID_TSI572, RIO_VID_TUNDRA)},
{RIO_DEVICE(RIO_DID_TSI574, RIO_VID_TUNDRA)},
{RIO_DEVICE(RIO_DID_TSI577, RIO_VID_TUNDRA)},
{RIO_DEVICE(RIO_DID_TSI578, RIO_VID_TUNDRA)},
{ 0, } /* terminate list */
};
static struct rio_driver tsi57x_driver = {
.name = "tsi57x",
.id_table = tsi57x_id_table,
.probe = tsi57x_probe,
.remove = tsi57x_remove,
};
static int __init tsi57x_init(void)
{
return rio_register_driver(&tsi57x_driver);
}
static void __exit tsi57x_exit(void)
{
rio_unregister_driver(&tsi57x_driver);
}
device_initcall(tsi57x_init);
module_exit(tsi57x_exit);
MODULE_DESCRIPTION("IDT Tsi57x Serial RapidIO switch family driver");
MODULE_AUTHOR("Integrated Device Technology, Inc.");
MODULE_LICENSE("GPL");
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