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dd5648c9f5
linux/drivers/rapidio/switches/tsi57x.c
Alexandre Bounine dd5648c9f5 rapidio: add default handler for error-stopped state 
The default error-stopped state handler provides recovery mechanism as
defined by RIO specification.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: 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>
Cc: Micha Nelissen <micha@neli.hopto.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-27 18:03:15 -07:00

320 lines
9.3 KiB
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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 "../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)
{
struct rio_mport *mport = rdev->net->hport;
u16 destid = rdev->rswitch->destid;
u8 hopcount = rdev->rswitch->hopcount;
u32 regval;
int portnum;
pr_debug("TSI578 %s [%d:%d]\n", __func__, destid, hopcount);
for (portnum = 0; portnum < 16; portnum++) {
/* Make sure that Port-Writes are enabled (for all ports) */
rio_mport_read_config_32(mport, destid, hopcount,
TSI578_SP_MODE(portnum), &regval);
rio_mport_write_config_32(mport, destid, hopcount,
TSI578_SP_MODE(portnum),
regval & ~TSI578_SP_MODE_PW_DIS);
/* Clear all pending interrupts */
rio_mport_read_config_32(mport, destid, hopcount,
rdev->phys_efptr +
RIO_PORT_N_ERR_STS_CSR(portnum),
&regval);
rio_mport_write_config_32(mport, destid, hopcount,
rdev->phys_efptr +
RIO_PORT_N_ERR_STS_CSR(portnum),
regval & 0x07120214);
rio_mport_read_config_32(mport, destid, hopcount,
TSI578_SP_INT_STATUS(portnum), &regval);
rio_mport_write_config_32(mport, destid, hopcount,
TSI578_SP_INT_STATUS(portnum),
regval & 0x000700bd);
/* Enable all interrupts to allow ports to send a port-write */
rio_mport_read_config_32(mport, destid, hopcount,
TSI578_SP_CTL_INDEP(portnum), &regval);
rio_mport_write_config_32(mport, destid, hopcount,
TSI578_SP_CTL_INDEP(portnum),
regval | 0x000b0000);
/* Skip next (odd) port if the current port is in x4 mode */
rio_mport_read_config_32(mport, destid, hopcount,
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_mport_write_config_32(mport, destid, hopcount,
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;
u16 destid = rdev->rswitch->destid;
u8 hopcount = rdev->rswitch->hopcount;
u32 intstat, err_status;
int sendcount, checkcount;
u8 route_port;
u32 regval;
rio_mport_read_config_32(mport, destid, hopcount,
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_mport_read_config_32(mport, destid, hopcount,
rdev->phys_efptr + RIO_PORT_N_CTL_CSR(portnum),
&regval);
if (!(regval & RIO_PORT_N_CTL_LOCKOUT)) {
rio_mport_write_config_32(mport, destid, hopcount,
rdev->phys_efptr + RIO_PORT_N_CTL_CSR(portnum),
regval | RIO_PORT_N_CTL_LOCKOUT);
udelay(50);
rio_mport_write_config_32(mport, destid, hopcount,
rdev->phys_efptr + RIO_PORT_N_CTL_CSR(portnum),
regval);
}
/* Read from link maintenance response register to clear
* valid bit
*/
rio_mport_read_config_32(mport, destid, hopcount,
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_mport_write_config_32(mport, destid, hopcount,
TSI578_SP_CS_TX(portnum), 0x40fc8000);
checkcount = 3;
while (checkcount--) {
udelay(50);
rio_mport_read_config_32(
mport, destid, hopcount,
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_mport_read_config_32(mport, destid, hopcount,
TSI578_SP_INT_STATUS(portnum), &intstat);
pr_debug("TSI578[%x:%x] SP%d_INT_STATUS=0x%08x\n",
destid, hopcount, portnum, intstat);
if (intstat & 0x10000) {
rio_mport_read_config_32(mport, destid, hopcount,
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, destid, hopcount,
RIO_GLOBAL_TABLE, regval, route_port);
}
rio_mport_write_config_32(mport, destid, hopcount,
TSI578_SP_INT_STATUS(portnum),
intstat & 0x000700bd);
return 0;
}
static int tsi57x_switch_init(struct rio_dev *rdev, int do_enum)
{
pr_debug("RIO: %s for %s\n", __func__, rio_name(rdev));
rdev->rswitch->add_entry = tsi57x_route_add_entry;
rdev->rswitch->get_entry = tsi57x_route_get_entry;
rdev->rswitch->clr_table = tsi57x_route_clr_table;
rdev->rswitch->set_domain = tsi57x_set_domain;
rdev->rswitch->get_domain = tsi57x_get_domain;
rdev->rswitch->em_init = tsi57x_em_init;
rdev->rswitch->em_handle = tsi57x_em_handler;
return 0;
}
DECLARE_RIO_SWITCH_INIT(RIO_VID_TUNDRA, RIO_DID_TSI572, tsi57x_switch_init);
DECLARE_RIO_SWITCH_INIT(RIO_VID_TUNDRA, RIO_DID_TSI574, tsi57x_switch_init);
DECLARE_RIO_SWITCH_INIT(RIO_VID_TUNDRA, RIO_DID_TSI577, tsi57x_switch_init);
DECLARE_RIO_SWITCH_INIT(RIO_VID_TUNDRA, RIO_DID_TSI578, tsi57x_switch_init);
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