379 lines
9.6 KiB
C
379 lines
9.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* IDT RXS Gen.3 Serial RapidIO switch family support
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*
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* Copyright 2016 Integrated Device Technology, Inc.
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*/
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#include <linux/stat.h>
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#include <linux/module.h>
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#include <linux/rio.h>
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#include <linux/rio_drv.h>
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#include <linux/rio_ids.h>
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#include <linux/delay.h>
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#include <asm/page.h>
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#include "../rio.h"
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#define RIO_EM_PW_STAT 0x40020
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#define RIO_PW_CTL 0x40204
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#define RIO_PW_CTL_PW_TMR 0xffffff00
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#define RIO_PW_ROUTE 0x40208
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#define RIO_EM_DEV_INT_EN 0x40030
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#define RIO_PLM_SPx_IMP_SPEC_CTL(x) (0x10100 + (x)*0x100)
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#define RIO_PLM_SPx_IMP_SPEC_CTL_SOFT_RST 0x02000000
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#define RIO_PLM_SPx_PW_EN(x) (0x10118 + (x)*0x100)
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#define RIO_PLM_SPx_PW_EN_OK2U 0x40000000
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#define RIO_PLM_SPx_PW_EN_LINIT 0x10000000
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#define RIO_BC_L2_Gn_ENTRYx_CSR(n, x) (0x31000 + (n)*0x400 + (x)*0x4)
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#define RIO_SPx_L2_Gn_ENTRYy_CSR(x, n, y) \
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(0x51000 + (x)*0x2000 + (n)*0x400 + (y)*0x4)
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static int
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idtg3_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
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u16 table, u16 route_destid, u8 route_port)
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{
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u32 rval;
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u32 entry = route_port;
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int err = 0;
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pr_debug("RIO: %s t=0x%x did_%x to p_%x\n",
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__func__, table, route_destid, entry);
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if (route_destid > 0xFF)
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return -EINVAL;
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if (route_port == RIO_INVALID_ROUTE)
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entry = RIO_RT_ENTRY_DROP_PKT;
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if (table == RIO_GLOBAL_TABLE) {
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/* Use broadcast register to update all per-port tables */
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err = rio_mport_write_config_32(mport, destid, hopcount,
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RIO_BC_L2_Gn_ENTRYx_CSR(0, route_destid),
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entry);
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return err;
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}
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/*
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* Verify that specified port/table number is valid
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*/
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err = rio_mport_read_config_32(mport, destid, hopcount,
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RIO_SWP_INFO_CAR, &rval);
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if (err)
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return err;
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if (table >= RIO_GET_TOTAL_PORTS(rval))
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return -EINVAL;
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err = rio_mport_write_config_32(mport, destid, hopcount,
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RIO_SPx_L2_Gn_ENTRYy_CSR(table, 0, route_destid),
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entry);
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return err;
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}
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static int
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idtg3_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
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u16 table, u16 route_destid, u8 *route_port)
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{
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u32 rval;
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int err;
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if (route_destid > 0xFF)
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return -EINVAL;
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err = rio_mport_read_config_32(mport, destid, hopcount,
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RIO_SWP_INFO_CAR, &rval);
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if (err)
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return err;
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/*
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* This switch device does not have the dedicated global routing table.
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* It is substituted by reading routing table of the ingress port of
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* maintenance read requests.
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*/
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if (table == RIO_GLOBAL_TABLE)
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table = RIO_GET_PORT_NUM(rval);
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else if (table >= RIO_GET_TOTAL_PORTS(rval))
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return -EINVAL;
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err = rio_mport_read_config_32(mport, destid, hopcount,
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RIO_SPx_L2_Gn_ENTRYy_CSR(table, 0, route_destid),
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&rval);
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if (err)
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return err;
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if (rval == RIO_RT_ENTRY_DROP_PKT)
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*route_port = RIO_INVALID_ROUTE;
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else
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*route_port = (u8)rval;
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return 0;
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}
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static int
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idtg3_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
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u16 table)
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{
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u32 i;
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u32 rval;
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int err;
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if (table == RIO_GLOBAL_TABLE) {
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for (i = 0; i <= 0xff; i++) {
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err = rio_mport_write_config_32(mport, destid, hopcount,
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RIO_BC_L2_Gn_ENTRYx_CSR(0, i),
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RIO_RT_ENTRY_DROP_PKT);
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if (err)
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break;
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}
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return err;
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}
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err = rio_mport_read_config_32(mport, destid, hopcount,
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RIO_SWP_INFO_CAR, &rval);
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if (err)
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return err;
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if (table >= RIO_GET_TOTAL_PORTS(rval))
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return -EINVAL;
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for (i = 0; i <= 0xff; i++) {
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err = rio_mport_write_config_32(mport, destid, hopcount,
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RIO_SPx_L2_Gn_ENTRYy_CSR(table, 0, i),
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RIO_RT_ENTRY_DROP_PKT);
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if (err)
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break;
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}
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return err;
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}
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/*
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* This routine performs device-specific initialization only.
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* All standard EM configuration should be performed at upper level.
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*/
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static int
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idtg3_em_init(struct rio_dev *rdev)
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{
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int i, tmp;
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u32 rval;
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pr_debug("RIO: %s [%d:%d]\n", __func__, rdev->destid, rdev->hopcount);
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/* Disable assertion of interrupt signal */
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rio_write_config_32(rdev, RIO_EM_DEV_INT_EN, 0);
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/* Disable port-write event notifications during initialization */
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rio_write_config_32(rdev, rdev->em_efptr + RIO_EM_PW_TX_CTRL,
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RIO_EM_PW_TX_CTRL_PW_DIS);
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/* Configure Port-Write notifications for hot-swap events */
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tmp = RIO_GET_TOTAL_PORTS(rdev->swpinfo);
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for (i = 0; i < tmp; i++) {
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rio_read_config_32(rdev,
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RIO_DEV_PORT_N_ERR_STS_CSR(rdev, i),
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&rval);
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if (rval & RIO_PORT_N_ERR_STS_PORT_UA)
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continue;
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/* Clear events signaled before enabling notification */
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rio_write_config_32(rdev,
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rdev->em_efptr + RIO_EM_PN_ERR_DETECT(i), 0);
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/* Enable event notifications */
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rio_write_config_32(rdev,
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rdev->em_efptr + RIO_EM_PN_ERRRATE_EN(i),
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RIO_EM_PN_ERRRATE_EN_OK2U | RIO_EM_PN_ERRRATE_EN_U2OK);
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/* Enable port-write generation on events */
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rio_write_config_32(rdev, RIO_PLM_SPx_PW_EN(i),
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RIO_PLM_SPx_PW_EN_OK2U | RIO_PLM_SPx_PW_EN_LINIT);
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}
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/* Set Port-Write destination port */
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tmp = RIO_GET_PORT_NUM(rdev->swpinfo);
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rio_write_config_32(rdev, RIO_PW_ROUTE, 1 << tmp);
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/* Enable sending port-write event notifications */
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rio_write_config_32(rdev, rdev->em_efptr + RIO_EM_PW_TX_CTRL, 0);
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/* set TVAL = ~50us */
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rio_write_config_32(rdev,
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rdev->phys_efptr + RIO_PORT_LINKTO_CTL_CSR, 0x8e << 8);
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return 0;
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}
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/*
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* idtg3_em_handler - device-specific error handler
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*
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* If the link is down (PORT_UNINIT) does nothing - this is considered
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* as link partner removal from the port.
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*
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* If the link is up (PORT_OK) - situation is handled as *new* device insertion.
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* In this case ERR_STOP bits are cleared by issuing soft reset command to the
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* reporting port. Inbound and outbound ackIDs are cleared by the reset as well.
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* This way the port is synchronized with freshly inserted device (assuming it
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* was reset/powered-up on insertion).
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*
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* TODO: This is not sufficient in a situation when a link between two devices
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* was down and up again (e.g. cable disconnect). For that situation full ackID
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* realignment process has to be implemented.
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*/
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static int
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idtg3_em_handler(struct rio_dev *rdev, u8 pnum)
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{
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u32 err_status;
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u32 rval;
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rio_read_config_32(rdev,
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RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),
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&err_status);
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/* Do nothing for device/link removal */
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if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT)
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return 0;
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/* When link is OK we have a device insertion.
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* Request port soft reset to clear errors if they present.
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* Inbound and outbound ackIDs will be 0 after reset.
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*/
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if (err_status & (RIO_PORT_N_ERR_STS_OUT_ES |
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RIO_PORT_N_ERR_STS_INP_ES)) {
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rio_read_config_32(rdev, RIO_PLM_SPx_IMP_SPEC_CTL(pnum), &rval);
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rio_write_config_32(rdev, RIO_PLM_SPx_IMP_SPEC_CTL(pnum),
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rval | RIO_PLM_SPx_IMP_SPEC_CTL_SOFT_RST);
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udelay(10);
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rio_write_config_32(rdev, RIO_PLM_SPx_IMP_SPEC_CTL(pnum), rval);
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msleep(500);
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}
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return 0;
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}
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static struct rio_switch_ops idtg3_switch_ops = {
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.owner = THIS_MODULE,
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.add_entry = idtg3_route_add_entry,
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.get_entry = idtg3_route_get_entry,
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.clr_table = idtg3_route_clr_table,
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.em_init = idtg3_em_init,
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.em_handle = idtg3_em_handler,
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};
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static int idtg3_probe(struct rio_dev *rdev, const struct rio_device_id *id)
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{
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pr_debug("RIO: %s for %s\n", __func__, rio_name(rdev));
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spin_lock(&rdev->rswitch->lock);
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if (rdev->rswitch->ops) {
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spin_unlock(&rdev->rswitch->lock);
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return -EINVAL;
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}
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rdev->rswitch->ops = &idtg3_switch_ops;
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if (rdev->do_enum) {
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/* Disable hierarchical routing support: Existing fabric
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* enumeration/discovery process (see rio-scan.c) uses 8-bit
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* flat destination ID routing only.
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*/
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rio_write_config_32(rdev, 0x5000 + RIO_BC_RT_CTL_CSR, 0);
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}
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spin_unlock(&rdev->rswitch->lock);
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return 0;
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}
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static void idtg3_remove(struct rio_dev *rdev)
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{
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pr_debug("RIO: %s for %s\n", __func__, rio_name(rdev));
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spin_lock(&rdev->rswitch->lock);
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if (rdev->rswitch->ops == &idtg3_switch_ops)
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rdev->rswitch->ops = NULL;
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spin_unlock(&rdev->rswitch->lock);
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}
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/*
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* Gen3 switches repeat sending PW messages until a corresponding event flag
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* is cleared. Use shutdown notification to disable generation of port-write
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* messages if their destination node is shut down.
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*/
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static void idtg3_shutdown(struct rio_dev *rdev)
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{
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int i;
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u32 rval;
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u16 destid;
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/* Currently the enumerator node acts also as PW handler */
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if (!rdev->do_enum)
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return;
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pr_debug("RIO: %s(%s)\n", __func__, rio_name(rdev));
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rio_read_config_32(rdev, RIO_PW_ROUTE, &rval);
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i = RIO_GET_PORT_NUM(rdev->swpinfo);
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/* Check port-write destination port */
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if (!((1 << i) & rval))
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return;
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/* Disable sending port-write event notifications if PW destID
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* matches to one of the enumerator node
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*/
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rio_read_config_32(rdev, rdev->em_efptr + RIO_EM_PW_TGT_DEVID, &rval);
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if (rval & RIO_EM_PW_TGT_DEVID_DEV16)
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destid = rval >> 16;
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else
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destid = ((rval & RIO_EM_PW_TGT_DEVID_D8) >> 16);
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if (rdev->net->hport->host_deviceid == destid) {
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rio_write_config_32(rdev,
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rdev->em_efptr + RIO_EM_PW_TX_CTRL, 0);
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pr_debug("RIO: %s(%s) PW transmission disabled\n",
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__func__, rio_name(rdev));
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}
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}
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static const struct rio_device_id idtg3_id_table[] = {
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{RIO_DEVICE(RIO_DID_IDTRXS1632, RIO_VID_IDT)},
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{RIO_DEVICE(RIO_DID_IDTRXS2448, RIO_VID_IDT)},
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{ 0, } /* terminate list */
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};
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static struct rio_driver idtg3_driver = {
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.name = "idt_gen3",
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.id_table = idtg3_id_table,
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.probe = idtg3_probe,
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.remove = idtg3_remove,
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.shutdown = idtg3_shutdown,
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};
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static int __init idtg3_init(void)
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{
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return rio_register_driver(&idtg3_driver);
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}
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static void __exit idtg3_exit(void)
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{
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pr_debug("RIO: %s\n", __func__);
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rio_unregister_driver(&idtg3_driver);
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pr_debug("RIO: %s done\n", __func__);
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}
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device_initcall(idtg3_init);
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module_exit(idtg3_exit);
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MODULE_DESCRIPTION("IDT RXS Gen.3 Serial RapidIO switch family driver");
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MODULE_AUTHOR("Integrated Device Technology, Inc.");
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MODULE_LICENSE("GPL");
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