/*
* IDT RXS Gen.3 Serial RapidIO switch family support
*
* Copyright 2016 Integrated Device Technology, Inc.
*
* 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/stat.h>
#include <linux/module.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/rio_ids.h>
#include <linux/delay.h>
#include <asm/page.h>
#include "../rio.h"
#define RIO_EM_PW_STAT 0x40020
#define RIO_PW_CTL 0x40204
#define RIO_PW_CTL_PW_TMR 0xffffff00
#define RIO_PW_ROUTE 0x40208
#define RIO_EM_DEV_INT_EN 0x40030
#define RIO_PLM_SPx_IMP_SPEC_CTL(x) (0x10100 + (x)*0x100)
#define RIO_PLM_SPx_IMP_SPEC_CTL_SOFT_RST 0x02000000
#define RIO_PLM_SPx_PW_EN(x) (0x10118 + (x)*0x100)
#define RIO_PLM_SPx_PW_EN_OK2U 0x40000000
#define RIO_PLM_SPx_PW_EN_LINIT 0x10000000
#define RIO_BC_L2_Gn_ENTRYx_CSR(n, x) (0x31000 + (n)*0x400 + (x)*0x4)
#define RIO_SPx_L2_Gn_ENTRYy_CSR(x, n, y) \
(0x51000 + (x)*0x2000 + (n)*0x400 + (y)*0x4)
static int
idtg3_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
u16 table, u16 route_destid, u8 route_port)
{
u32 rval;
u32 entry = route_port;
int err = 0;
pr_debug("RIO: %s t=0x%x did_%x to p_%x\n",
__func__, table, route_destid, entry);
if (route_destid > 0xFF)
return -EINVAL;
if (route_port == RIO_INVALID_ROUTE)
entry = RIO_RT_ENTRY_DROP_PKT;
if (table == RIO_GLOBAL_TABLE) {
/* Use broadcast register to update all per-port tables */
err = rio_mport_write_config_32(mport, destid, hopcount,
RIO_BC_L2_Gn_ENTRYx_CSR(0, route_destid),
entry);
return err;
}
/*
* Verify that specified port/table number is valid
*/
err = rio_mport_read_config_32(mport, destid, hopcount,
RIO_SWP_INFO_CAR, &rval);
if (err)
return err;
if (table >= RIO_GET_TOTAL_PORTS(rval))
return -EINVAL;
err = rio_mport_write_config_32(mport, destid, hopcount,
RIO_SPx_L2_Gn_ENTRYy_CSR(table, 0, route_destid),
entry);
return err;
}
static int
idtg3_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
u16 table, u16 route_destid, u8 *route_port)
{
u32 rval;
int err;
if (route_destid > 0xFF)
return -EINVAL;
err = rio_mport_read_config_32(mport, destid, hopcount,
RIO_SWP_INFO_CAR, &rval);
if (err)
return err;
/*
* This switch device does not have the dedicated global routing table.
* It is substituted by reading routing table of the ingress port of
* maintenance read requests.
*/
if (table == RIO_GLOBAL_TABLE)
table = RIO_GET_PORT_NUM(rval);
else if (table >= RIO_GET_TOTAL_PORTS(rval))
return -EINVAL;
err = rio_mport_read_config_32(mport, destid, hopcount,
RIO_SPx_L2_Gn_ENTRYy_CSR(table, 0, route_destid),
&rval);
if (err)
return err;
if (rval == RIO_RT_ENTRY_DROP_PKT)
*route_port = RIO_INVALID_ROUTE;
else
*route_port = (u8)rval;
return 0;
}
static int
idtg3_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
u16 table)
{
u32 i;
u32 rval;
int err;
if (table == RIO_GLOBAL_TABLE) {
for (i = 0; i <= 0xff; i++) {
err = rio_mport_write_config_32(mport, destid, hopcount,
RIO_BC_L2_Gn_ENTRYx_CSR(0, i),
RIO_RT_ENTRY_DROP_PKT);
if (err)
break;
}
return err;
}
err = rio_mport_read_config_32(mport, destid, hopcount,
RIO_SWP_INFO_CAR, &rval);
if (err)
return err;
if (table >= RIO_GET_TOTAL_PORTS(rval))
return -EINVAL;
for (i = 0; i <= 0xff; i++) {
err = rio_mport_write_config_32(mport, destid, hopcount,
RIO_SPx_L2_Gn_ENTRYy_CSR(table, 0, i),
RIO_RT_ENTRY_DROP_PKT);
if (err)
break;
}
return err;
}
/*
* This routine performs device-specific initialization only.
* All standard EM configuration should be performed at upper level.
*/
static int
idtg3_em_init(struct rio_dev *rdev)
{
int i, tmp;
u32 rval;
pr_debug("RIO: %s [%d:%d]\n", __func__, rdev->destid, rdev->hopcount);
/* Disable assertion of interrupt signal */
rio_write_config_32(rdev, RIO_EM_DEV_INT_EN, 0);
/* Disable port-write event notifications during initialization */
rio_write_config_32(rdev, rdev->em_efptr + RIO_EM_PW_TX_CTRL,
RIO_EM_PW_TX_CTRL_PW_DIS);
/* Configure Port-Write notifications for hot-swap events */
tmp = RIO_GET_TOTAL_PORTS(rdev->swpinfo);
for (i = 0; i < tmp; i++) {
rio_read_config_32(rdev,
RIO_DEV_PORT_N_ERR_STS_CSR(rdev, i),
&rval);
if (rval & RIO_PORT_N_ERR_STS_PORT_UA)
continue;
/* Clear events signaled before enabling notification */
rio_write_config_32(rdev,
rdev->em_efptr + RIO_EM_PN_ERR_DETECT(i), 0);
/* Enable event notifications */
rio_write_config_32(rdev,
rdev->em_efptr + RIO_EM_PN_ERRRATE_EN(i),
RIO_EM_PN_ERRRATE_EN_OK2U | RIO_EM_PN_ERRRATE_EN_U2OK);
/* Enable port-write generation on events */
rio_write_config_32(rdev, RIO_PLM_SPx_PW_EN(i),
RIO_PLM_SPx_PW_EN_OK2U | RIO_PLM_SPx_PW_EN_LINIT);
}
/* Set Port-Write destination port */
tmp = RIO_GET_PORT_NUM(rdev->swpinfo);
rio_write_config_32(rdev, RIO_PW_ROUTE, 1 << tmp);
/* Enable sending port-write event notifications */
rio_write_config_32(rdev, rdev->em_efptr + RIO_EM_PW_TX_CTRL, 0);
/* set TVAL = ~50us */
rio_write_config_32(rdev,
rdev->phys_efptr + RIO_PORT_LINKTO_CTL_CSR, 0x8e << 8);
return 0;
}
/*
* idtg3_em_handler - device-specific error handler
*
* If the link is down (PORT_UNINIT) does nothing - this is considered
* as link partner removal from the port.
*
* If the link is up (PORT_OK) - situation is handled as *new* device insertion.
* In this case ERR_STOP bits are cleared by issuing soft reset command to the
* reporting port. Inbound and outbound ackIDs are cleared by the reset as well.
* This way the port is synchronized with freshly inserted device (assuming it
* was reset/powered-up on insertion).
*
* TODO: This is not sufficient in a situation when a link between two devices
* was down and up again (e.g. cable disconnect). For that situation full ackID
* realignment process has to be implemented.
*/
static int
idtg3_em_handler(struct rio_dev *rdev, u8 pnum)
{
u32 err_status;
u32 rval;
rio_read_config_32(rdev,
RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),
&err_status);
/* Do nothing for device/link removal */
if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT)
return 0;
/* When link is OK we have a device insertion.
* Request port soft reset to clear errors if they present.
* Inbound and outbound ackIDs will be 0 after reset.
*/
if (err_status & (RIO_PORT_N_ERR_STS_OUT_ES |
RIO_PORT_N_ERR_STS_INP_ES)) {
rio_read_config_32(rdev, RIO_PLM_SPx_IMP_SPEC_CTL(pnum), &rval);
rio_write_config_32(rdev, RIO_PLM_SPx_IMP_SPEC_CTL(pnum),
rval | RIO_PLM_SPx_IMP_SPEC_CTL_SOFT_RST);
udelay(10);
rio_write_config_32(rdev, RIO_PLM_SPx_IMP_SPEC_CTL(pnum), rval);
msleep(500);
}
return 0;
}
static struct rio_switch_ops idtg3_switch_ops = {
.owner = THIS_MODULE,
.add_entry = idtg3_route_add_entry,
.get_entry = idtg3_route_get_entry,
.clr_table = idtg3_route_clr_table,
.em_init = idtg3_em_init,
.em_handle = idtg3_em_handler,
};
static int idtg3_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 = &idtg3_switch_ops;
if (rdev->do_enum) {
/* Disable hierarchical routing support: Existing fabric
* enumeration/discovery process (see rio-scan.c) uses 8-bit
* flat destination ID routing only.
*/
rio_write_config_32(rdev, 0x5000 + RIO_BC_RT_CTL_CSR, 0);
}
spin_unlock(&rdev->rswitch->lock);
return 0;
}
static void idtg3_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 == &idtg3_switch_ops)
rdev->rswitch->ops = NULL;
spin_unlock(&rdev->rswitch->lock);
}
/*
* Gen3 switches repeat sending PW messages until a corresponding event flag
* is cleared. Use shutdown notification to disable generation of port-write
* messages if their destination node is shut down.
*/
static void idtg3_shutdown(struct rio_dev *rdev)
{
int i;
u32 rval;
u16 destid;
/* Currently the enumerator node acts also as PW handler */
if (!rdev->do_enum)
return;
pr_debug("RIO: %s(%s)\n", __func__, rio_name(rdev));
rio_read_config_32(rdev, RIO_PW_ROUTE, &rval);
i = RIO_GET_PORT_NUM(rdev->swpinfo);
/* Check port-write destination port */
if (!((1 << i) & rval))
return;
/* Disable sending port-write event notifications if PW destID
* matches to one of the enumerator node
*/
rio_read_config_32(rdev, rdev->em_efptr + RIO_EM_PW_TGT_DEVID, &rval);
if (rval & RIO_EM_PW_TGT_DEVID_DEV16)
destid = rval >> 16;
else
destid = ((rval & RIO_EM_PW_TGT_DEVID_D8) >> 16);
if (rdev->net->hport->host_deviceid == destid) {
rio_write_config_32(rdev,
rdev->em_efptr + RIO_EM_PW_TX_CTRL, 0);
pr_debug("RIO: %s(%s) PW transmission disabled\n",
__func__, rio_name(rdev));
}
}
static struct rio_device_id idtg3_id_table[] = {
{RIO_DEVICE(RIO_DID_IDTRXS1632, RIO_VID_IDT)},
{RIO_DEVICE(RIO_DID_IDTRXS2448, RIO_VID_IDT)},
{ 0, } /* terminate list */
};
static struct rio_driver idtg3_driver = {
.name = "idt_gen3",
.id_table = idtg3_id_table,
.probe = idtg3_probe,
.remove = idtg3_remove,
.shutdown = idtg3_shutdown,
};
static int __init idtg3_init(void)
{
return rio_register_driver(&idtg3_driver);
}
static void __exit idtg3_exit(void)
{
pr_debug("RIO: %s\n", __func__);
rio_unregister_driver(&idtg3_driver);
pr_debug("RIO: %s done\n", __func__);
}
device_initcall(idtg3_init);
module_exit(idtg3_exit);
MODULE_DESCRIPTION("IDT RXS Gen.3 Serial RapidIO switch family driver");
MODULE_AUTHOR("Integrated Device Technology, Inc.");
MODULE_LICENSE("GPL");