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qemu / ipxe / refs/heads/hackesp / . / src / drivers / infiniband / linda.c
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/*
* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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 any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#include <ipxe/io.h>
#include <ipxe/pci.h>
#include <ipxe/infiniband.h>
#include <ipxe/i2c.h>
#include <ipxe/bitbash.h>
#include <ipxe/malloc.h>
#include <ipxe/iobuf.h>
#include "linda.h"
/**
* @file
*
* QLogic Linda Infiniband HCA
*
*/
/** A Linda send work queue */
struct linda_send_work_queue {
/** Send buffer usage */
uint8_t *send_buf;
/** Producer index */
unsigned int prod;
/** Consumer index */
unsigned int cons;
};
/** A Linda receive work queue */
struct linda_recv_work_queue {
/** Receive header ring */
void *header;
/** Receive header producer offset (written by hardware) */
struct QIB_7220_scalar header_prod;
/** Receive header consumer offset */
unsigned int header_cons;
/** Offset within register space of the eager array */
unsigned long eager_array;
/** Number of entries in eager array */
unsigned int eager_entries;
/** Eager array producer index */
unsigned int eager_prod;
/** Eager array consumer index */
unsigned int eager_cons;
};
/** A Linda HCA */
struct linda {
/** Registers */
void *regs;
/** In-use contexts */
uint8_t used_ctx[LINDA_NUM_CONTEXTS];
/** Send work queues */
struct linda_send_work_queue send_wq[LINDA_NUM_CONTEXTS];
/** Receive work queues */
struct linda_recv_work_queue recv_wq[LINDA_NUM_CONTEXTS];
/** Offset within register space of the first send buffer */
unsigned long send_buffer_base;
/** Send buffer availability (reported by hardware) */
struct QIB_7220_SendBufAvail *sendbufavail;
/** Send buffer availability (maintained by software) */
uint8_t send_buf[LINDA_MAX_SEND_BUFS];
/** Send buffer availability producer counter */
unsigned int send_buf_prod;
/** Send buffer availability consumer counter */
unsigned int send_buf_cons;
/** Number of reserved send buffers (across all QPs) */
unsigned int reserved_send_bufs;
/** I2C bit-bashing interface */
struct i2c_bit_basher i2c;
/** I2C serial EEPROM */
struct i2c_device eeprom;
};
/***************************************************************************
*
* Linda register access
*
***************************************************************************
*
* This card requires atomic 64-bit accesses. Strange things happen
* if you try to use 32-bit accesses; sometimes they work, sometimes
* they don't, sometimes you get random data.
*/
/**
* Read Linda qword register
*
* @v linda Linda device
* @v qword Register buffer to read into
* @v offset Register offset
*/
static void linda_readq ( struct linda *linda, uint64_t *qword,
unsigned long offset ) {
*qword = readq ( linda->regs + offset );
}
#define linda_readq( _linda, _ptr, _offset ) \
linda_readq ( (_linda), (_ptr)->u.qwords, (_offset) )
#define linda_readq_array8b( _linda, _ptr, _offset, _idx ) \
linda_readq ( (_linda), (_ptr), ( (_offset) + ( (_idx) * 8 ) ) )
#define linda_readq_array64k( _linda, _ptr, _offset, _idx ) \
linda_readq ( (_linda), (_ptr), ( (_offset) + ( (_idx) * 65536 ) ) )
/**
* Write Linda qword register
*
* @v linda Linda device
* @v qword Register buffer to write
* @v offset Register offset
*/
static void linda_writeq ( struct linda *linda, const uint64_t *qword,
unsigned long offset ) {
writeq ( *qword, ( linda->regs + offset ) );
}
#define linda_writeq( _linda, _ptr, _offset ) \
linda_writeq ( (_linda), (_ptr)->u.qwords, (_offset) )
#define linda_writeq_array8b( _linda, _ptr, _offset, _idx ) \
linda_writeq ( (_linda), (_ptr), ( (_offset) + ( (_idx) * 8 ) ) )
#define linda_writeq_array64k( _linda, _ptr, _offset, _idx ) \
linda_writeq ( (_linda), (_ptr), ( (_offset) + ( (_idx) * 65536 ) ) )
/**
* Write Linda dword register
*
* @v linda Linda device
* @v dword Value to write
* @v offset Register offset
*/
static void linda_writel ( struct linda *linda, uint32_t dword,
unsigned long offset ) {
writel ( dword, ( linda->regs + offset ) );
}
/***************************************************************************
*
* Link state management
*
***************************************************************************
*/
/**
* Textual representation of link state
*
* @v link_state Link state
* @ret link_text Link state text
*/
static const char * linda_link_state_text ( unsigned int link_state ) {
switch ( link_state ) {
case LINDA_LINK_STATE_DOWN: return "DOWN";
case LINDA_LINK_STATE_INIT: return "INIT";
case LINDA_LINK_STATE_ARM: return "ARM";
case LINDA_LINK_STATE_ACTIVE: return "ACTIVE";
case LINDA_LINK_STATE_ACT_DEFER:return "ACT_DEFER";
default: return "UNKNOWN";
}
}
/**
* Handle link state change
*
* @v linda Linda device
*/
static void linda_link_state_changed ( struct ib_device *ibdev ) {
struct linda *linda = ib_get_drvdata ( ibdev );
struct QIB_7220_IBCStatus ibcstatus;
struct QIB_7220_EXTCtrl extctrl;
unsigned int link_state;
unsigned int link_width;
unsigned int link_speed;
/* Read link state */
linda_readq ( linda, &ibcstatus, QIB_7220_IBCStatus_offset );
link_state = BIT_GET ( &ibcstatus, LinkState );
link_width = BIT_GET ( &ibcstatus, LinkWidthActive );
link_speed = BIT_GET ( &ibcstatus, LinkSpeedActive );
DBGC ( linda, "Linda %p link state %s (%s %s)\n", linda,
linda_link_state_text ( link_state ),
( link_speed ? "DDR" : "SDR" ), ( link_width ? "x4" : "x1" ) );
/* Set LEDs according to link state */
linda_readq ( linda, &extctrl, QIB_7220_EXTCtrl_offset );
BIT_SET ( &extctrl, LEDPriPortGreenOn,
( ( link_state >= LINDA_LINK_STATE_INIT ) ? 1 : 0 ) );
BIT_SET ( &extctrl, LEDPriPortYellowOn,
( ( link_state >= LINDA_LINK_STATE_ACTIVE ) ? 1 : 0 ) );
linda_writeq ( linda, &extctrl, QIB_7220_EXTCtrl_offset );
/* Notify Infiniband core of link state change */
ibdev->port_state = ( link_state + 1 );
ibdev->link_width_active =
( link_width ? IB_LINK_WIDTH_4X : IB_LINK_WIDTH_1X );
ibdev->link_speed_active =
( link_speed ? IB_LINK_SPEED_DDR : IB_LINK_SPEED_SDR );
ib_link_state_changed ( ibdev );
}
/**
* Wait for link state change to take effect
*
* @v linda Linda device
* @v new_link_state Expected link state
* @ret rc Return status code
*/
static int linda_link_state_check ( struct linda *linda,
unsigned int new_link_state ) {
struct QIB_7220_IBCStatus ibcstatus;
unsigned int link_state;
unsigned int i;
for ( i = 0 ; i < LINDA_LINK_STATE_MAX_WAIT_US ; i++ ) {
linda_readq ( linda, &ibcstatus, QIB_7220_IBCStatus_offset );
link_state = BIT_GET ( &ibcstatus, LinkState );
if ( link_state == new_link_state )
return 0;
udelay ( 1 );
}
DBGC ( linda, "Linda %p timed out waiting for link state %s\n",
linda, linda_link_state_text ( link_state ) );
return -ETIMEDOUT;
}
/**
* Set port information
*
* @v ibdev Infiniband device
* @v mad Set port information MAD
*/
static int linda_set_port_info ( struct ib_device *ibdev, union ib_mad *mad ) {
struct linda *linda = ib_get_drvdata ( ibdev );
struct ib_port_info *port_info = &mad->smp.smp_data.port_info;
struct QIB_7220_IBCCtrl ibcctrl;
unsigned int port_state;
unsigned int link_state;
/* Set new link state */
port_state = ( port_info->link_speed_supported__port_state & 0xf );
if ( port_state ) {
link_state = ( port_state - 1 );
DBGC ( linda, "Linda %p set link state to %s (%x)\n", linda,
linda_link_state_text ( link_state ), link_state );
linda_readq ( linda, &ibcctrl, QIB_7220_IBCCtrl_offset );
BIT_SET ( &ibcctrl, LinkCmd, link_state );
linda_writeq ( linda, &ibcctrl, QIB_7220_IBCCtrl_offset );
/* Wait for link state change to take effect. Ignore
* errors; the current link state will be returned via
* the GetResponse MAD.
*/
linda_link_state_check ( linda, link_state );
}
/* Detect and report link state change */
linda_link_state_changed ( ibdev );
return 0;
}
/**
* Set partition key table
*
* @v ibdev Infiniband device
* @v mad Set partition key table MAD
*/
static int linda_set_pkey_table ( struct ib_device *ibdev __unused,
union ib_mad *mad __unused ) {
/* Nothing to do */
return 0;
}
/***************************************************************************
*
* Context allocation
*
***************************************************************************
*/
/**
* Map context number to QPN
*
* @v ctx Context index
* @ret qpn Queue pair number
*/
static int linda_ctx_to_qpn ( unsigned int ctx ) {
/* This mapping is fixed by hardware */
return ( ctx * 2 );
}
/**
* Map QPN to context number
*
* @v qpn Queue pair number
* @ret ctx Context index
*/
static int linda_qpn_to_ctx ( unsigned int qpn ) {
/* This mapping is fixed by hardware */
return ( qpn / 2 );
}
/**
* Allocate a context
*
* @v linda Linda device
* @ret ctx Context index, or negative error
*/
static int linda_alloc_ctx ( struct linda *linda ) {
unsigned int ctx;
for ( ctx = 0 ; ctx < LINDA_NUM_CONTEXTS ; ctx++ ) {
if ( ! linda->used_ctx[ctx] ) {
linda->used_ctx[ctx ] = 1;
DBGC2 ( linda, "Linda %p CTX %d allocated\n",
linda, ctx );
return ctx;
}
}
DBGC ( linda, "Linda %p out of available contexts\n", linda );
return -ENOENT;
}
/**
* Free a context
*
* @v linda Linda device
* @v ctx Context index
*/
static void linda_free_ctx ( struct linda *linda, unsigned int ctx ) {
linda->used_ctx[ctx] = 0;
DBGC2 ( linda, "Linda %p CTX %d freed\n", linda, ctx );
}
/***************************************************************************
*
* Send datapath
*
***************************************************************************
*/
/** Send buffer toggle bit
*
* We encode send buffers as 7 bits of send buffer index plus a single
* bit which should match the "check" bit in the SendBufAvail array.
*/
#define LINDA_SEND_BUF_TOGGLE 0x80
/**
* Allocate a send buffer
*
* @v linda Linda device
* @ret send_buf Send buffer
*
* You must guarantee that a send buffer is available. This is done
* by refusing to allocate more TX WQEs in total than the number of
* available send buffers.
*/
static unsigned int linda_alloc_send_buf ( struct linda *linda ) {
unsigned int send_buf;
send_buf = linda->send_buf[linda->send_buf_cons];
send_buf ^= LINDA_SEND_BUF_TOGGLE;
linda->send_buf_cons = ( ( linda->send_buf_cons + 1 ) %
LINDA_MAX_SEND_BUFS );
return send_buf;
}
/**
* Free a send buffer
*
* @v linda Linda device
* @v send_buf Send buffer
*/
static void linda_free_send_buf ( struct linda *linda,
unsigned int send_buf ) {
linda->send_buf[linda->send_buf_prod] = send_buf;
linda->send_buf_prod = ( ( linda->send_buf_prod + 1 ) %
LINDA_MAX_SEND_BUFS );
}
/**
* Check to see if send buffer is in use
*
* @v linda Linda device
* @v send_buf Send buffer
* @ret in_use Send buffer is in use
*/
static int linda_send_buf_in_use ( struct linda *linda,
unsigned int send_buf ) {
unsigned int send_idx;
unsigned int send_check;
unsigned int inusecheck;
unsigned int inuse;
unsigned int check;
send_idx = ( send_buf & ~LINDA_SEND_BUF_TOGGLE );
send_check = ( !! ( send_buf & LINDA_SEND_BUF_TOGGLE ) );
inusecheck = BIT_GET ( linda->sendbufavail, InUseCheck[send_idx] );
inuse = ( !! ( inusecheck & 0x02 ) );
check = ( !! ( inusecheck & 0x01 ) );
return ( inuse || ( check != send_check ) );
}
/**
* Calculate starting offset for send buffer
*
* @v linda Linda device
* @v send_buf Send buffer
* @ret offset Starting offset
*/
static unsigned long linda_send_buffer_offset ( struct linda *linda,
unsigned int send_buf ) {
return ( linda->send_buffer_base +
( ( send_buf & ~LINDA_SEND_BUF_TOGGLE ) *
LINDA_SEND_BUF_SIZE ) );
}
/**
* Create send work queue
*
* @v linda Linda device
* @v qp Queue pair
*/
static int linda_create_send_wq ( struct linda *linda,
struct ib_queue_pair *qp ) {
struct ib_work_queue *wq = &qp->send;
struct linda_send_work_queue *linda_wq = ib_wq_get_drvdata ( wq );
int rc;
/* Reserve send buffers */
if ( ( linda->reserved_send_bufs + qp->send.num_wqes ) >
LINDA_MAX_SEND_BUFS ) {
DBGC ( linda, "Linda %p out of send buffers (have %d, used "
"%d, need %d)\n", linda, LINDA_MAX_SEND_BUFS,
linda->reserved_send_bufs, qp->send.num_wqes );
rc = -ENOBUFS;
goto err_reserve_bufs;
}
linda->reserved_send_bufs += qp->send.num_wqes;
/* Reset work queue */
linda_wq->prod = 0;
linda_wq->cons = 0;
/* Allocate space for send buffer uasge list */
linda_wq->send_buf = zalloc ( qp->send.num_wqes *
sizeof ( linda_wq->send_buf[0] ) );
if ( ! linda_wq->send_buf ) {
rc = -ENOBUFS;
goto err_alloc_send_buf;
}
return 0;
free ( linda_wq->send_buf );
err_alloc_send_buf:
linda->reserved_send_bufs -= qp->send.num_wqes;
err_reserve_bufs:
return rc;
}
/**
* Destroy send work queue
*
* @v linda Linda device
* @v qp Queue pair
*/
static void linda_destroy_send_wq ( struct linda *linda,
struct ib_queue_pair *qp ) {
struct ib_work_queue *wq = &qp->send;
struct linda_send_work_queue *linda_wq = ib_wq_get_drvdata ( wq );
free ( linda_wq->send_buf );
linda->reserved_send_bufs -= qp->send.num_wqes;
}
/**
* Initialise send datapath
*
* @v linda Linda device
* @ret rc Return status code
*/
static int linda_init_send ( struct linda *linda ) {
struct QIB_7220_SendBufBase sendbufbase;
struct QIB_7220_SendBufAvailAddr sendbufavailaddr;
struct QIB_7220_SendCtrl sendctrl;
unsigned int i;
int rc;
/* Retrieve SendBufBase */
linda_readq ( linda, &sendbufbase, QIB_7220_SendBufBase_offset );
linda->send_buffer_base = BIT_GET ( &sendbufbase,
BaseAddr_SmallPIO );
DBGC ( linda, "Linda %p send buffers at %lx\n",
linda, linda->send_buffer_base );
/* Initialise the send_buf[] array */
for ( i = 0 ; i < LINDA_MAX_SEND_BUFS ; i++ )
linda->send_buf[i] = i;
/* Allocate space for the SendBufAvail array */
linda->sendbufavail = malloc_phys ( sizeof ( *linda->sendbufavail ),
LINDA_SENDBUFAVAIL_ALIGN );
if ( ! linda->sendbufavail ) {
rc = -ENOMEM;
goto err_alloc_sendbufavail;
}
memset ( linda->sendbufavail, 0, sizeof ( *linda->sendbufavail ) );
/* Program SendBufAvailAddr into the hardware */
memset ( &sendbufavailaddr, 0, sizeof ( sendbufavailaddr ) );
BIT_FILL_1 ( &sendbufavailaddr, SendBufAvailAddr,
( virt_to_bus ( linda->sendbufavail ) >> 6 ) );
linda_writeq ( linda, &sendbufavailaddr,
QIB_7220_SendBufAvailAddr_offset );
/* Enable sending and DMA of SendBufAvail */
memset ( &sendctrl, 0, sizeof ( sendctrl ) );
BIT_FILL_2 ( &sendctrl,
SendBufAvailUpd, 1,
SPioEnable, 1 );
linda_writeq ( linda, &sendctrl, QIB_7220_SendCtrl_offset );
return 0;
free_phys ( linda->sendbufavail, sizeof ( *linda->sendbufavail ) );
err_alloc_sendbufavail:
return rc;
}
/**
* Shut down send datapath
*
* @v linda Linda device
*/
static void linda_fini_send ( struct linda *linda ) {
struct QIB_7220_SendCtrl sendctrl;
/* Disable sending and DMA of SendBufAvail */
memset ( &sendctrl, 0, sizeof ( sendctrl ) );
linda_writeq ( linda, &sendctrl, QIB_7220_SendCtrl_offset );
mb();
/* Ensure hardware has seen this disable */
linda_readq ( linda, &sendctrl, QIB_7220_SendCtrl_offset );
free_phys ( linda->sendbufavail, sizeof ( *linda->sendbufavail ) );
}
/***************************************************************************
*
* Receive datapath
*
***************************************************************************
*/
/**
* Create receive work queue
*
* @v linda Linda device
* @v qp Queue pair
* @ret rc Return status code
*/
static int linda_create_recv_wq ( struct linda *linda,
struct ib_queue_pair *qp ) {
struct ib_work_queue *wq = &qp->recv;
struct linda_recv_work_queue *linda_wq = ib_wq_get_drvdata ( wq );
struct QIB_7220_RcvHdrAddr0 rcvhdraddr;
struct QIB_7220_RcvHdrTailAddr0 rcvhdrtailaddr;
struct QIB_7220_RcvHdrHead0 rcvhdrhead;
struct QIB_7220_scalar rcvegrindexhead;
struct QIB_7220_RcvCtrl rcvctrl;
unsigned int ctx = linda_qpn_to_ctx ( qp->qpn );
int rc;
/* Reset context information */
memset ( &linda_wq->header_prod, 0,
sizeof ( linda_wq->header_prod ) );
linda_wq->header_cons = 0;
linda_wq->eager_prod = 0;
linda_wq->eager_cons = 0;
/* Allocate receive header buffer */
linda_wq->header = malloc_phys ( LINDA_RECV_HEADERS_SIZE,
LINDA_RECV_HEADERS_ALIGN );
if ( ! linda_wq->header ) {
rc = -ENOMEM;
goto err_alloc_header;
}
/* Enable context in hardware */
memset ( &rcvhdraddr, 0, sizeof ( rcvhdraddr ) );
BIT_FILL_1 ( &rcvhdraddr, RcvHdrAddr0,
( virt_to_bus ( linda_wq->header ) >> 2 ) );
linda_writeq_array8b ( linda, &rcvhdraddr,
QIB_7220_RcvHdrAddr0_offset, ctx );
memset ( &rcvhdrtailaddr, 0, sizeof ( rcvhdrtailaddr ) );
BIT_FILL_1 ( &rcvhdrtailaddr, RcvHdrTailAddr0,
( virt_to_bus ( &linda_wq->header_prod ) >> 2 ) );
linda_writeq_array8b ( linda, &rcvhdrtailaddr,
QIB_7220_RcvHdrTailAddr0_offset, ctx );
memset ( &rcvhdrhead, 0, sizeof ( rcvhdrhead ) );
BIT_FILL_1 ( &rcvhdrhead, counter, 1 );
linda_writeq_array64k ( linda, &rcvhdrhead,
QIB_7220_RcvHdrHead0_offset, ctx );
memset ( &rcvegrindexhead, 0, sizeof ( rcvegrindexhead ) );
BIT_FILL_1 ( &rcvegrindexhead, Value, 1 );
linda_writeq_array64k ( linda, &rcvegrindexhead,
QIB_7220_RcvEgrIndexHead0_offset, ctx );
linda_readq ( linda, &rcvctrl, QIB_7220_RcvCtrl_offset );
BIT_SET ( &rcvctrl, PortEnable[ctx], 1 );
BIT_SET ( &rcvctrl, IntrAvail[ctx], 1 );
linda_writeq ( linda, &rcvctrl, QIB_7220_RcvCtrl_offset );
DBGC ( linda, "Linda %p QPN %ld CTX %d hdrs [%lx,%lx) prod %lx\n",
linda, qp->qpn, ctx, virt_to_bus ( linda_wq->header ),
( virt_to_bus ( linda_wq->header ) + LINDA_RECV_HEADERS_SIZE ),
virt_to_bus ( &linda_wq->header_prod ) );
return 0;
free_phys ( linda_wq->header, LINDA_RECV_HEADERS_SIZE );
err_alloc_header:
return rc;
}
/**
* Destroy receive work queue
*
* @v linda Linda device
* @v qp Queue pair
*/
static void linda_destroy_recv_wq ( struct linda *linda,
struct ib_queue_pair *qp ) {
struct ib_work_queue *wq = &qp->recv;
struct linda_recv_work_queue *linda_wq = ib_wq_get_drvdata ( wq );
struct QIB_7220_RcvCtrl rcvctrl;
unsigned int ctx = linda_qpn_to_ctx ( qp->qpn );
/* Disable context in hardware */
linda_readq ( linda, &rcvctrl, QIB_7220_RcvCtrl_offset );
BIT_SET ( &rcvctrl, PortEnable[ctx], 0 );
BIT_SET ( &rcvctrl, IntrAvail[ctx], 0 );
linda_writeq ( linda, &rcvctrl, QIB_7220_RcvCtrl_offset );
/* Make sure the hardware has seen that the context is disabled */
linda_readq ( linda, &rcvctrl, QIB_7220_RcvCtrl_offset );
mb();
/* Free headers ring */
free_phys ( linda_wq->header, LINDA_RECV_HEADERS_SIZE );
/* Free context */
linda_free_ctx ( linda, ctx );
}
/**
* Initialise receive datapath
*
* @v linda Linda device
* @ret rc Return status code
*/
static int linda_init_recv ( struct linda *linda ) {
struct QIB_7220_RcvCtrl rcvctrl;
struct QIB_7220_scalar rcvegrbase;
struct QIB_7220_scalar rcvhdrentsize;
struct QIB_7220_scalar rcvhdrcnt;
struct QIB_7220_RcvBTHQP rcvbthqp;
unsigned int portcfg;
unsigned long egrbase;
unsigned int eager_array_size_0;
unsigned int eager_array_size_other;
unsigned int ctx;
/* Select configuration based on number of contexts */
switch ( LINDA_NUM_CONTEXTS ) {
case 5:
portcfg = LINDA_PORTCFG_5CTX;
eager_array_size_0 = LINDA_EAGER_ARRAY_SIZE_5CTX_0;
eager_array_size_other = LINDA_EAGER_ARRAY_SIZE_5CTX_OTHER;
break;
case 9:
portcfg = LINDA_PORTCFG_9CTX;
eager_array_size_0 = LINDA_EAGER_ARRAY_SIZE_9CTX_0;
eager_array_size_other = LINDA_EAGER_ARRAY_SIZE_9CTX_OTHER;
break;
case 17:
portcfg = LINDA_PORTCFG_17CTX;
eager_array_size_0 = LINDA_EAGER_ARRAY_SIZE_17CTX_0;
eager_array_size_other = LINDA_EAGER_ARRAY_SIZE_17CTX_OTHER;
break;
default:
linker_assert ( 0, invalid_LINDA_NUM_CONTEXTS );
return -EINVAL;
}
/* Configure number of contexts */
memset ( &rcvctrl, 0, sizeof ( rcvctrl ) );
BIT_FILL_3 ( &rcvctrl,
TailUpd, 1,
PortCfg, portcfg,
RcvQPMapEnable, 1 );
linda_writeq ( linda, &rcvctrl, QIB_7220_RcvCtrl_offset );
/* Configure receive header buffer sizes */
memset ( &rcvhdrcnt, 0, sizeof ( rcvhdrcnt ) );
BIT_FILL_1 ( &rcvhdrcnt, Value, LINDA_RECV_HEADER_COUNT );
linda_writeq ( linda, &rcvhdrcnt, QIB_7220_RcvHdrCnt_offset );
memset ( &rcvhdrentsize, 0, sizeof ( rcvhdrentsize ) );
BIT_FILL_1 ( &rcvhdrentsize, Value, ( LINDA_RECV_HEADER_SIZE >> 2 ) );
linda_writeq ( linda, &rcvhdrentsize, QIB_7220_RcvHdrEntSize_offset );
/* Calculate eager array start addresses for each context */
linda_readq ( linda, &rcvegrbase, QIB_7220_RcvEgrBase_offset );
egrbase = BIT_GET ( &rcvegrbase, Value );
linda->recv_wq[0].eager_array = egrbase;
linda->recv_wq[0].eager_entries = eager_array_size_0;
egrbase += ( eager_array_size_0 * sizeof ( struct QIB_7220_RcvEgr ) );
for ( ctx = 1 ; ctx < LINDA_NUM_CONTEXTS ; ctx++ ) {
linda->recv_wq[ctx].eager_array = egrbase;
linda->recv_wq[ctx].eager_entries = eager_array_size_other;
egrbase += ( eager_array_size_other *
sizeof ( struct QIB_7220_RcvEgr ) );
}
for ( ctx = 0 ; ctx < LINDA_NUM_CONTEXTS ; ctx++ ) {
DBGC ( linda, "Linda %p CTX %d eager array at %lx (%d "
"entries)\n", linda, ctx,
linda->recv_wq[ctx].eager_array,
linda->recv_wq[ctx].eager_entries );
}
/* Set the BTH QP for Infinipath packets to an unused value */
memset ( &rcvbthqp, 0, sizeof ( rcvbthqp ) );
BIT_FILL_1 ( &rcvbthqp, RcvBTHQP, LINDA_QP_IDETH );
linda_writeq ( linda, &rcvbthqp, QIB_7220_RcvBTHQP_offset );
return 0;
}
/**
* Shut down receive datapath
*
* @v linda Linda device
*/
static void linda_fini_recv ( struct linda *linda __unused ) {
/* Nothing to do; all contexts were already disabled when the
* queue pairs were destroyed
*/
}
/***************************************************************************
*
* Completion queue operations
*
***************************************************************************
*/
/**
* Create completion queue
*
* @v ibdev Infiniband device
* @v cq Completion queue
* @ret rc Return status code
*/
static int linda_create_cq ( struct ib_device *ibdev,
struct ib_completion_queue *cq ) {
struct linda *linda = ib_get_drvdata ( ibdev );
static int cqn;
/* The hardware has no concept of completion queues. We
* simply use the association between CQs and WQs (already
* handled by the IB core) to decide which WQs to poll.
*
* We do set a CQN, just to avoid confusing debug messages
* from the IB core.
*/
cq->cqn = ++cqn;
DBGC ( linda, "Linda %p CQN %ld created\n", linda, cq->cqn );
return 0;
}
/**
* Destroy completion queue
*
* @v ibdev Infiniband device
* @v cq Completion queue
*/
static void linda_destroy_cq ( struct ib_device *ibdev,
struct ib_completion_queue *cq ) {
struct linda *linda = ib_get_drvdata ( ibdev );
/* Nothing to do */
DBGC ( linda, "Linda %p CQN %ld destroyed\n", linda, cq->cqn );
}
/***************************************************************************
*
* Queue pair operations
*
***************************************************************************
*/
/**
* Create queue pair
*
* @v ibdev Infiniband device
* @v qp Queue pair
* @ret rc Return status code
*/
static int linda_create_qp ( struct ib_device *ibdev,
struct ib_queue_pair *qp ) {
struct linda *linda = ib_get_drvdata ( ibdev );
int ctx;
int rc;
/* Locate an available context */
ctx = linda_alloc_ctx ( linda );
if ( ctx < 0 ) {
rc = ctx;
goto err_alloc_ctx;
}
/* Set queue pair number based on context index */
qp->qpn = linda_ctx_to_qpn ( ctx );
/* Set work-queue private data pointers */
ib_wq_set_drvdata ( &qp->send, &linda->send_wq[ctx] );
ib_wq_set_drvdata ( &qp->recv, &linda->recv_wq[ctx] );
/* Create receive work queue */
if ( ( rc = linda_create_recv_wq ( linda, qp ) ) != 0 )
goto err_create_recv_wq;
/* Create send work queue */
if ( ( rc = linda_create_send_wq ( linda, qp ) ) != 0 )
goto err_create_send_wq;
return 0;
linda_destroy_send_wq ( linda, qp );
err_create_send_wq:
linda_destroy_recv_wq ( linda, qp );
err_create_recv_wq:
linda_free_ctx ( linda, ctx );
err_alloc_ctx:
return rc;
}
/**
* Modify queue pair
*
* @v ibdev Infiniband device
* @v qp Queue pair
* @ret rc Return status code
*/
static int linda_modify_qp ( struct ib_device *ibdev,
struct ib_queue_pair *qp ) {
struct linda *linda = ib_get_drvdata ( ibdev );
/* Nothing to do; the hardware doesn't have a notion of queue
* keys
*/
DBGC ( linda, "Linda %p QPN %ld modified\n", linda, qp->qpn );
return 0;
}
/**
* Destroy queue pair
*
* @v ibdev Infiniband device
* @v qp Queue pair
*/
static void linda_destroy_qp ( struct ib_device *ibdev,
struct ib_queue_pair *qp ) {
struct linda *linda = ib_get_drvdata ( ibdev );
linda_destroy_send_wq ( linda, qp );
linda_destroy_recv_wq ( linda, qp );
}
/***************************************************************************
*
* Work request operations
*
***************************************************************************
*/
/**
* Post send work queue entry
*
* @v ibdev Infiniband device
* @v qp Queue pair
* @v dest Destination address vector
* @v iobuf I/O buffer
* @ret rc Return status code
*/
static int linda_post_send ( struct ib_device *ibdev,
struct ib_queue_pair *qp,
struct ib_address_vector *dest,
struct io_buffer *iobuf ) {
struct linda *linda = ib_get_drvdata ( ibdev );
struct ib_work_queue *wq = &qp->send;
struct linda_send_work_queue *linda_wq = ib_wq_get_drvdata ( wq );
struct QIB_7220_SendPbc sendpbc;
uint8_t header_buf[IB_MAX_HEADER_SIZE];
struct io_buffer headers;
unsigned int send_buf;
unsigned long start_offset;
unsigned long offset;
size_t len;
ssize_t frag_len;
uint32_t *data;
/* Allocate send buffer and calculate offset */
send_buf = linda_alloc_send_buf ( linda );
start_offset = offset = linda_send_buffer_offset ( linda, send_buf );
/* Store I/O buffer and send buffer index */
assert ( wq->iobufs[linda_wq->prod] == NULL );
wq->iobufs[linda_wq->prod] = iobuf;
linda_wq->send_buf[linda_wq->prod] = send_buf;
/* Construct headers */
iob_populate ( &headers, header_buf, 0, sizeof ( header_buf ) );
iob_reserve ( &headers, sizeof ( header_buf ) );
ib_push ( ibdev, &headers, qp, iob_len ( iobuf ), dest );
/* Calculate packet length */
len = ( ( sizeof ( sendpbc ) + iob_len ( &headers ) +
iob_len ( iobuf ) + 3 ) & ~3 );
/* Construct send per-buffer control word */
memset ( &sendpbc, 0, sizeof ( sendpbc ) );
BIT_FILL_2 ( &sendpbc,
LengthP1_toibc, ( ( len >> 2 ) - 1 ),
VL15, 1 );
/* Write SendPbc */
DBG_DISABLE ( DBGLVL_IO );
linda_writeq ( linda, &sendpbc, offset );
offset += sizeof ( sendpbc );
/* Write headers */
for ( data = headers.data, frag_len = iob_len ( &headers ) ;
frag_len > 0 ; data++, offset += 4, frag_len -= 4 ) {
linda_writel ( linda, *data, offset );
}
/* Write data */
for ( data = iobuf->data, frag_len = iob_len ( iobuf ) ;
frag_len > 0 ; data++, offset += 4, frag_len -= 4 ) {
linda_writel ( linda, *data, offset );
}
DBG_ENABLE ( DBGLVL_IO );
assert ( ( start_offset + len ) == offset );
DBGC2 ( linda, "Linda %p QPN %ld TX %d(%d) posted [%lx,%lx)\n",
linda, qp->qpn, send_buf, linda_wq->prod,
start_offset, offset );
/* Increment producer counter */
linda_wq->prod = ( ( linda_wq->prod + 1 ) & ( wq->num_wqes - 1 ) );
return 0;
}
/**
* Complete send work queue entry
*
* @v ibdev Infiniband device
* @v qp Queue pair
* @v wqe_idx Work queue entry index
*/
static void linda_complete_send ( struct ib_device *ibdev,
struct ib_queue_pair *qp,
unsigned int wqe_idx ) {
struct linda *linda = ib_get_drvdata ( ibdev );
struct ib_work_queue *wq = &qp->send;
struct linda_send_work_queue *linda_wq = ib_wq_get_drvdata ( wq );
struct io_buffer *iobuf;
unsigned int send_buf;
/* Parse completion */
send_buf = linda_wq->send_buf[wqe_idx];
DBGC2 ( linda, "Linda %p QPN %ld TX %d(%d) complete\n",
linda, qp->qpn, send_buf, wqe_idx );
/* Complete work queue entry */
iobuf = wq->iobufs[wqe_idx];
assert ( iobuf != NULL );
ib_complete_send ( ibdev, qp, iobuf, 0 );
wq->iobufs[wqe_idx] = NULL;
/* Free send buffer */
linda_free_send_buf ( linda, send_buf );
}
/**
* Poll send work queue
*
* @v ibdev Infiniband device
* @v qp Queue pair
*/
static void linda_poll_send_wq ( struct ib_device *ibdev,
struct ib_queue_pair *qp ) {
struct linda *linda = ib_get_drvdata ( ibdev );
struct ib_work_queue *wq = &qp->send;
struct linda_send_work_queue *linda_wq = ib_wq_get_drvdata ( wq );
unsigned int send_buf;
/* Look for completions */
while ( wq->fill ) {
/* Check to see if send buffer has completed */
send_buf = linda_wq->send_buf[linda_wq->cons];
if ( linda_send_buf_in_use ( linda, send_buf ) )
break;
/* Complete this buffer */
linda_complete_send ( ibdev, qp, linda_wq->cons );
/* Increment consumer counter */
linda_wq->cons = ( ( linda_wq->cons + 1 ) &
( wq->num_wqes - 1 ) );
}
}
/**
* Post receive work queue entry
*
* @v ibdev Infiniband device
* @v qp Queue pair
* @v iobuf I/O buffer
* @ret rc Return status code
*/
static int linda_post_recv ( struct ib_device *ibdev,
struct ib_queue_pair *qp,
struct io_buffer *iobuf ) {
struct linda *linda = ib_get_drvdata ( ibdev );
struct ib_work_queue *wq = &qp->recv;
struct linda_recv_work_queue *linda_wq = ib_wq_get_drvdata ( wq );
struct QIB_7220_RcvEgr rcvegr;
struct QIB_7220_scalar rcvegrindexhead;
unsigned int ctx = linda_qpn_to_ctx ( qp->qpn );
physaddr_t addr;
size_t len;
unsigned int wqe_idx;
unsigned int bufsize;
/* Sanity checks */
addr = virt_to_bus ( iobuf->data );
len = iob_tailroom ( iobuf );
if ( addr & ( LINDA_EAGER_BUFFER_ALIGN - 1 ) ) {
DBGC ( linda, "Linda %p QPN %ld misaligned RX buffer "
"(%08lx)\n", linda, qp->qpn, addr );
return -EINVAL;
}
if ( len != LINDA_RECV_PAYLOAD_SIZE ) {
DBGC ( linda, "Linda %p QPN %ld wrong RX buffer size (%zd)\n",
linda, qp->qpn, len );
return -EINVAL;
}
/* Calculate eager producer index and WQE index */
wqe_idx = ( linda_wq->eager_prod & ( wq->num_wqes - 1 ) );
assert ( wq->iobufs[wqe_idx] == NULL );
/* Store I/O buffer */
wq->iobufs[wqe_idx] = iobuf;
/* Calculate buffer size */
switch ( LINDA_RECV_PAYLOAD_SIZE ) {
case 2048: bufsize = LINDA_EAGER_BUFFER_2K; break;
case 4096: bufsize = LINDA_EAGER_BUFFER_4K; break;
case 8192: bufsize = LINDA_EAGER_BUFFER_8K; break;
case 16384: bufsize = LINDA_EAGER_BUFFER_16K; break;
case 32768: bufsize = LINDA_EAGER_BUFFER_32K; break;
case 65536: bufsize = LINDA_EAGER_BUFFER_64K; break;
default: linker_assert ( 0, invalid_rx_payload_size );
bufsize = LINDA_EAGER_BUFFER_NONE;
}
/* Post eager buffer */
memset ( &rcvegr, 0, sizeof ( rcvegr ) );
BIT_FILL_2 ( &rcvegr,
Addr, ( addr >> 11 ),
BufSize, bufsize );
linda_writeq_array8b ( linda, &rcvegr,
linda_wq->eager_array, linda_wq->eager_prod );
DBGC2 ( linda, "Linda %p QPN %ld RX egr %d(%d) posted [%lx,%lx)\n",
linda, qp->qpn, linda_wq->eager_prod, wqe_idx,
addr, ( addr + len ) );
/* Increment producer index */
linda_wq->eager_prod = ( ( linda_wq->eager_prod + 1 ) &
( linda_wq->eager_entries - 1 ) );
/* Update head index */
memset ( &rcvegrindexhead, 0, sizeof ( rcvegrindexhead ) );
BIT_FILL_1 ( &rcvegrindexhead,
Value, ( ( linda_wq->eager_prod + 1 ) &
( linda_wq->eager_entries - 1 ) ) );
linda_writeq_array64k ( linda, &rcvegrindexhead,
QIB_7220_RcvEgrIndexHead0_offset, ctx );
return 0;
}
/**
* Complete receive work queue entry
*
* @v ibdev Infiniband device
* @v qp Queue pair
* @v header_offs Header offset
*/
static void linda_complete_recv ( struct ib_device *ibdev,
struct ib_queue_pair *qp,
unsigned int header_offs ) {
struct linda *linda = ib_get_drvdata ( ibdev );
struct ib_work_queue *wq = &qp->recv;
struct linda_recv_work_queue *linda_wq = ib_wq_get_drvdata ( wq );
struct QIB_7220_RcvHdrFlags *rcvhdrflags;
struct QIB_7220_RcvEgr rcvegr;
struct io_buffer headers;
struct io_buffer *iobuf;
struct ib_queue_pair *intended_qp;
struct ib_address_vector dest;
struct ib_address_vector source;
unsigned int rcvtype;
unsigned int pktlen;
unsigned int egrindex;
unsigned int useegrbfr;
unsigned int iberr, mkerr, tiderr, khdrerr, mtuerr;
unsigned int lenerr, parityerr, vcrcerr, icrcerr;
unsigned int err;
unsigned int hdrqoffset;
unsigned int header_len;
unsigned int padded_payload_len;
unsigned int wqe_idx;
size_t payload_len;
int qp0;
int rc;
/* RcvHdrFlags are at the end of the header entry */
rcvhdrflags = ( linda_wq->header + header_offs +
LINDA_RECV_HEADER_SIZE - sizeof ( *rcvhdrflags ) );
rcvtype = BIT_GET ( rcvhdrflags, RcvType );
pktlen = ( BIT_GET ( rcvhdrflags, PktLen ) << 2 );
egrindex = BIT_GET ( rcvhdrflags, EgrIndex );
useegrbfr = BIT_GET ( rcvhdrflags, UseEgrBfr );
hdrqoffset = ( BIT_GET ( rcvhdrflags, HdrqOffset ) << 2 );
iberr = BIT_GET ( rcvhdrflags, IBErr );
mkerr = BIT_GET ( rcvhdrflags, MKErr );
tiderr = BIT_GET ( rcvhdrflags, TIDErr );
khdrerr = BIT_GET ( rcvhdrflags, KHdrErr );
mtuerr = BIT_GET ( rcvhdrflags, MTUErr );
lenerr = BIT_GET ( rcvhdrflags, LenErr );
parityerr = BIT_GET ( rcvhdrflags, ParityErr );
vcrcerr = BIT_GET ( rcvhdrflags, VCRCErr );
icrcerr = BIT_GET ( rcvhdrflags, ICRCErr );
header_len = ( LINDA_RECV_HEADER_SIZE - hdrqoffset -
sizeof ( *rcvhdrflags ) );
padded_payload_len = ( pktlen - header_len - 4 /* ICRC */ );
err = ( iberr | mkerr | tiderr | khdrerr | mtuerr |
lenerr | parityerr | vcrcerr | icrcerr );
/* IB header is placed immediately before RcvHdrFlags */
iob_populate ( &headers, ( ( ( void * ) rcvhdrflags ) - header_len ),
header_len, header_len );
/* Dump diagnostic information */
if ( err || ( ! useegrbfr ) ) {
DBGC ( linda, "Linda %p QPN %ld RX egr %d%s hdr %d type %d "
"len %d(%d+%d+4)%s%s%s%s%s%s%s%s%s%s%s\n", linda,
qp->qpn, egrindex, ( useegrbfr ? "" : "(unused)" ),
( header_offs / LINDA_RECV_HEADER_SIZE ), rcvtype,
pktlen, header_len, padded_payload_len,
( err ? " [Err" : "" ), ( iberr ? " IB" : "" ),
( mkerr ? " MK" : "" ), ( tiderr ? " TID" : "" ),
( khdrerr ? " KHdr" : "" ), ( mtuerr ? " MTU" : "" ),
( lenerr ? " Len" : "" ), ( parityerr ? " Parity" : ""),
( vcrcerr ? " VCRC" : "" ), ( icrcerr ? " ICRC" : "" ),
( err ? "]" : "" ) );
} else {
DBGC2 ( linda, "Linda %p QPN %ld RX egr %d hdr %d type %d "
"len %d(%d+%d+4)\n", linda, qp->qpn, egrindex,
( header_offs / LINDA_RECV_HEADER_SIZE ), rcvtype,
pktlen, header_len, padded_payload_len );
}
DBGCP_HDA ( linda, hdrqoffset, headers.data,
( header_len + sizeof ( *rcvhdrflags ) ) );
/* Parse header to generate address vector */
qp0 = ( qp->qpn == 0 );
intended_qp = NULL;
if ( ( rc = ib_pull ( ibdev, &headers, ( qp0 ? &intended_qp : NULL ),
&payload_len, &dest, &source ) ) != 0 ) {
DBGC ( linda, "Linda %p could not parse headers: %s\n",
linda, strerror ( rc ) );
err = 1;
}
if ( ! intended_qp )
intended_qp = qp;
/* Complete this buffer and any skipped buffers. Note that
* when the hardware runs out of buffers, it will repeatedly
* report the same buffer (the tail) as a TID error, and that
* it also has a habit of sometimes skipping over several
* buffers at once.
*/
while ( 1 ) {
/* If we have caught up to the producer counter, stop.
* This will happen when the hardware first runs out
* of buffers and starts reporting TID errors against
* the eager buffer it wants to use next.
*/
if ( linda_wq->eager_cons == linda_wq->eager_prod )
break;
/* If we have caught up to where we should be after
* completing this egrindex, stop. We phrase the test
* this way to avoid completing the entire ring when
* we receive the same egrindex twice in a row.
*/
if ( ( linda_wq->eager_cons ==
( ( egrindex + 1 ) & ( linda_wq->eager_entries - 1 ) )))
break;
/* Identify work queue entry and corresponding I/O
* buffer.
*/
wqe_idx = ( linda_wq->eager_cons & ( wq->num_wqes - 1 ) );
iobuf = wq->iobufs[wqe_idx];
assert ( iobuf != NULL );
wq->iobufs[wqe_idx] = NULL;
/* Complete the eager buffer */
if ( linda_wq->eager_cons == egrindex ) {
/* Completing the eager buffer described in
* this header entry.
*/
if ( payload_len <= iob_tailroom ( iobuf ) ) {
iob_put ( iobuf, payload_len );
rc = ( err ?
-EIO : ( useegrbfr ? 0 : -ECANCELED ) );
} else {
DBGC ( linda, "Linda %p bad payload len %zd\n",
linda, payload_len );
rc = -EPROTO;
}
/* Redirect to target QP if necessary */
if ( qp != intended_qp ) {
DBGC ( linda, "Linda %p redirecting QPN %ld "
"=> %ld\n",
linda, qp->qpn, intended_qp->qpn );
/* Compensate for incorrect fill levels */
qp->recv.fill--;
intended_qp->recv.fill++;
}
ib_complete_recv ( ibdev, intended_qp, &dest, &source,
iobuf, rc );
} else {
/* Completing on a skipped-over eager buffer */
ib_complete_recv ( ibdev, qp, &dest, &source, iobuf,
-ECANCELED );
}
/* Clear eager buffer */
memset ( &rcvegr, 0, sizeof ( rcvegr ) );
linda_writeq_array8b ( linda, &rcvegr, linda_wq->eager_array,
linda_wq->eager_cons );
/* Increment consumer index */
linda_wq->eager_cons = ( ( linda_wq->eager_cons + 1 ) &
( linda_wq->eager_entries - 1 ) );
}
}
/**
* Poll receive work queue
*
* @v ibdev Infiniband device
* @v qp Queue pair
*/
static void linda_poll_recv_wq ( struct ib_device *ibdev,
struct ib_queue_pair *qp ) {
struct linda *linda = ib_get_drvdata ( ibdev );
struct ib_work_queue *wq = &qp->recv;
struct linda_recv_work_queue *linda_wq = ib_wq_get_drvdata ( wq );
struct QIB_7220_RcvHdrHead0 rcvhdrhead;
unsigned int ctx = linda_qpn_to_ctx ( qp->qpn );
unsigned int header_prod;
/* Check for received packets */
header_prod = ( BIT_GET ( &linda_wq->header_prod, Value ) << 2 );
if ( header_prod == linda_wq->header_cons )
return;
/* Process all received packets */
while ( linda_wq->header_cons != header_prod ) {
/* Complete the receive */
linda_complete_recv ( ibdev, qp, linda_wq->header_cons );
/* Increment the consumer offset */
linda_wq->header_cons += LINDA_RECV_HEADER_SIZE;
linda_wq->header_cons %= LINDA_RECV_HEADERS_SIZE;
}
/* Update consumer offset */
memset ( &rcvhdrhead, 0, sizeof ( rcvhdrhead ) );
BIT_FILL_2 ( &rcvhdrhead,
RcvHeadPointer, ( linda_wq->header_cons >> 2 ),
counter, 1 );
linda_writeq_array64k ( linda, &rcvhdrhead,
QIB_7220_RcvHdrHead0_offset, ctx );
}
/**
* Poll completion queue
*
* @v ibdev Infiniband device
* @v cq Completion queue
*/
static void linda_poll_cq ( struct ib_device *ibdev,
struct ib_completion_queue *cq ) {
struct ib_work_queue *wq;
/* Poll associated send and receive queues */
list_for_each_entry ( wq, &cq->work_queues, list ) {
if ( wq->is_send ) {
linda_poll_send_wq ( ibdev, wq->qp );
} else {
linda_poll_recv_wq ( ibdev, wq->qp );
}
}
}
/***************************************************************************
*
* Event queues
*
***************************************************************************
*/
/**
* Poll event queue
*
* @v ibdev Infiniband device
*/
static void linda_poll_eq ( struct ib_device *ibdev ) {
struct linda *linda = ib_get_drvdata ( ibdev );
struct QIB_7220_ErrStatus errstatus;
struct QIB_7220_ErrClear errclear;
/* Check for link status changes */
DBG_DISABLE ( DBGLVL_IO );
linda_readq ( linda, &errstatus, QIB_7220_ErrStatus_offset );
DBG_ENABLE ( DBGLVL_IO );
if ( BIT_GET ( &errstatus, IBStatusChanged ) ) {
linda_link_state_changed ( ibdev );
memset ( &errclear, 0, sizeof ( errclear ) );
BIT_FILL_1 ( &errclear, IBStatusChangedClear, 1 );
linda_writeq ( linda, &errclear, QIB_7220_ErrClear_offset );
}
}
/***************************************************************************
*
* Infiniband link-layer operations
*
***************************************************************************
*/
/**
* Initialise Infiniband link
*
* @v ibdev Infiniband device
* @ret rc Return status code
*/
static int linda_open ( struct ib_device *ibdev ) {
struct linda *linda = ib_get_drvdata ( ibdev );
struct QIB_7220_Control control;
/* Disable link */
linda_readq ( linda, &control, QIB_7220_Control_offset );
BIT_SET ( &control, LinkEn, 1 );
linda_writeq ( linda, &control, QIB_7220_Control_offset );
return 0;
}
/**
* Close Infiniband link
*
* @v ibdev Infiniband device
*/
static void linda_close ( struct ib_device *ibdev ) {
struct linda *linda = ib_get_drvdata ( ibdev );
struct QIB_7220_Control control;
/* Disable link */
linda_readq ( linda, &control, QIB_7220_Control_offset );
BIT_SET ( &control, LinkEn, 0 );
linda_writeq ( linda, &control, QIB_7220_Control_offset );
}
/***************************************************************************
*
* Multicast group operations
*
***************************************************************************
*/
/**
* Attach to multicast group
*
* @v ibdev Infiniband device
* @v qp Queue pair
* @v gid Multicast GID
* @ret rc Return status code
*/
static int linda_mcast_attach ( struct ib_device *ibdev,
struct ib_queue_pair *qp,
union ib_gid *gid ) {
struct linda *linda = ib_get_drvdata ( ibdev );
( void ) linda;
( void ) qp;
( void ) gid;
return 0;
}
/**
* Detach from multicast group
*
* @v ibdev Infiniband device
* @v qp Queue pair
* @v gid Multicast GID
*/
static void linda_mcast_detach ( struct ib_device *ibdev,
struct ib_queue_pair *qp,
union ib_gid *gid ) {
struct linda *linda = ib_get_drvdata ( ibdev );
( void ) linda;
( void ) qp;
( void ) gid;
}
/** Linda Infiniband operations */
static struct ib_device_operations linda_ib_operations = {
.create_cq = linda_create_cq,
.destroy_cq = linda_destroy_cq,
.create_qp = linda_create_qp,
.modify_qp = linda_modify_qp,
.destroy_qp = linda_destroy_qp,
.post_send = linda_post_send,
.post_recv = linda_post_recv,
.poll_cq = linda_poll_cq,
.poll_eq = linda_poll_eq,
.open = linda_open,
.close = linda_close,
.mcast_attach = linda_mcast_attach,
.mcast_detach = linda_mcast_detach,
.set_port_info = linda_set_port_info,
.set_pkey_table = linda_set_pkey_table,
};
/***************************************************************************
*
* I2C bus operations
*
***************************************************************************
*/
/** Linda I2C bit to GPIO mappings */
static unsigned int linda_i2c_bits[] = {
[I2C_BIT_SCL] = ( 1 << LINDA_GPIO_SCL ),
[I2C_BIT_SDA] = ( 1 << LINDA_GPIO_SDA ),
};
/**
* Read Linda I2C line status
*
* @v basher Bit-bashing interface
* @v bit_id Bit number
* @ret zero Input is a logic 0
* @ret non-zero Input is a logic 1
*/
static int linda_i2c_read_bit ( struct bit_basher *basher,
unsigned int bit_id ) {
struct linda *linda =
container_of ( basher, struct linda, i2c.basher );
struct QIB_7220_EXTStatus extstatus;
unsigned int status;
DBG_DISABLE ( DBGLVL_IO );
linda_readq ( linda, &extstatus, QIB_7220_EXTStatus_offset );
status = ( BIT_GET ( &extstatus, GPIOIn ) & linda_i2c_bits[bit_id] );
DBG_ENABLE ( DBGLVL_IO );
return status;
}
/**
* Write Linda I2C line status
*
* @v basher Bit-bashing interface
* @v bit_id Bit number
* @v data Value to write
*/
static void linda_i2c_write_bit ( struct bit_basher *basher,
unsigned int bit_id, unsigned long data ) {
struct linda *linda =
container_of ( basher, struct linda, i2c.basher );
struct QIB_7220_EXTCtrl extctrl;
struct QIB_7220_GPIO gpioout;
unsigned int bit = linda_i2c_bits[bit_id];
unsigned int outputs = 0;
unsigned int output_enables = 0;
DBG_DISABLE ( DBGLVL_IO );
/* Read current GPIO mask and outputs */
linda_readq ( linda, &extctrl, QIB_7220_EXTCtrl_offset );
linda_readq ( linda, &gpioout, QIB_7220_GPIOOut_offset );
/* Update outputs and output enables. I2C lines are tied
* high, so we always set the output to 0 and use the output
* enable to control the line.
*/
output_enables = BIT_GET ( &extctrl, GPIOOe );
output_enables = ( ( output_enables & ~bit ) | ( ~data & bit ) );
outputs = BIT_GET ( &gpioout, GPIO );
outputs = ( outputs & ~bit );
BIT_SET ( &extctrl, GPIOOe, output_enables );
BIT_SET ( &gpioout, GPIO, outputs );
/* Write the output enable first; that way we avoid logic
* hazards.
*/
linda_writeq ( linda, &extctrl, QIB_7220_EXTCtrl_offset );
linda_writeq ( linda, &gpioout, QIB_7220_GPIOOut_offset );
mb();
DBG_ENABLE ( DBGLVL_IO );
}
/** Linda I2C bit-bashing interface operations */
static struct bit_basher_operations linda_i2c_basher_ops = {
.read = linda_i2c_read_bit,
.write = linda_i2c_write_bit,
};
/**
* Initialise Linda I2C subsystem
*
* @v linda Linda device
* @ret rc Return status code
*/
static int linda_init_i2c ( struct linda *linda ) {
static int try_eeprom_address[] = { 0x51, 0x50 };
unsigned int i;
int rc;
/* Initialise bus */
if ( ( rc = init_i2c_bit_basher ( &linda->i2c,
&linda_i2c_basher_ops ) ) != 0 ) {
DBGC ( linda, "Linda %p could not initialise I2C bus: %s\n",
linda, strerror ( rc ) );
return rc;
}
/* Probe for devices */
for ( i = 0 ; i < ( sizeof ( try_eeprom_address ) /
sizeof ( try_eeprom_address[0] ) ) ; i++ ) {
init_i2c_eeprom ( &linda->eeprom, try_eeprom_address[i] );
if ( ( rc = i2c_check_presence ( &linda->i2c.i2c,
&linda->eeprom ) ) == 0 ) {
DBGC2 ( linda, "Linda %p found EEPROM at %02x\n",
linda, try_eeprom_address[i] );
return 0;
}
}
DBGC ( linda, "Linda %p could not find EEPROM\n", linda );
return -ENODEV;
}
/**
* Read EEPROM parameters
*
* @v linda Linda device
* @v guid GUID to fill in
* @ret rc Return status code
*/
static int linda_read_eeprom ( struct linda *linda, union ib_guid *guid ) {
struct i2c_interface *i2c = &linda->i2c.i2c;
int rc;
/* Read GUID */
if ( ( rc = i2c->read ( i2c, &linda->eeprom, LINDA_EEPROM_GUID_OFFSET,
guid->bytes, sizeof ( *guid ) ) ) != 0 ) {
DBGC ( linda, "Linda %p could not read GUID: %s\n",
linda, strerror ( rc ) );
return rc;
}
DBGC2 ( linda, "Linda %p has GUID " IB_GUID_FMT "\n",
linda, IB_GUID_ARGS ( guid ) );
/* Read serial number (debug only) */
if ( DBG_LOG ) {
uint8_t serial[LINDA_EEPROM_SERIAL_SIZE + 1];
serial[ sizeof ( serial ) - 1 ] = '\0';
if ( ( rc = i2c->read ( i2c, &linda->eeprom,
LINDA_EEPROM_SERIAL_OFFSET, serial,
( sizeof ( serial ) - 1 ) ) ) != 0 ) {
DBGC ( linda, "Linda %p could not read serial: %s\n",
linda, strerror ( rc ) );
return rc;
}
DBGC2 ( linda, "Linda %p has serial number \"%s\"\n",
linda, serial );
}
return 0;
}
/***************************************************************************
*
* External parallel bus access
*
***************************************************************************
*/
/**
* Request ownership of the IB external parallel bus
*
* @v linda Linda device
* @ret rc Return status code
*/
static int linda_ib_epb_request ( struct linda *linda ) {
struct QIB_7220_ibsd_epb_access_ctrl access;
unsigned int i;
/* Request ownership */
memset ( &access, 0, sizeof ( access ) );
BIT_FILL_1 ( &access, sw_ib_epb_req, 1 );
linda_writeq ( linda, &access, QIB_7220_ibsd_epb_access_ctrl_offset );
/* Wait for ownership to be granted */
for ( i = 0 ; i < LINDA_EPB_REQUEST_MAX_WAIT_US ; i++ ) {
linda_readq ( linda, &access,
QIB_7220_ibsd_epb_access_ctrl_offset );
if ( BIT_GET ( &access, sw_ib_epb_req_granted ) )
return 0;
udelay ( 1 );
}
DBGC ( linda, "Linda %p timed out waiting for IB EPB request\n",
linda );
return -ETIMEDOUT;
}
/**
* Wait for IB external parallel bus transaction to complete
*
* @v linda Linda device
* @v xact Buffer to hold transaction result
* @ret rc Return status code
*/
static int linda_ib_epb_wait ( struct linda *linda,
struct QIB_7220_ibsd_epb_transaction_reg *xact ) {
unsigned int i;
/* Discard first read to allow for signals crossing clock domains */
linda_readq ( linda, xact, QIB_7220_ibsd_epb_transaction_reg_offset );
for ( i = 0 ; i < LINDA_EPB_XACT_MAX_WAIT_US ; i++ ) {
linda_readq ( linda, xact,
QIB_7220_ibsd_epb_transaction_reg_offset );
if ( BIT_GET ( xact, ib_epb_rdy ) ) {
if ( BIT_GET ( xact, ib_epb_req_error ) ) {
DBGC ( linda, "Linda %p EPB transaction "
"failed\n", linda );
return -EIO;
} else {
return 0;
}
}
udelay ( 1 );
}
DBGC ( linda, "Linda %p timed out waiting for IB EPB transaction\n",
linda );
return -ETIMEDOUT;
}
/**
* Release ownership of the IB external parallel bus
*
* @v linda Linda device
*/
static void linda_ib_epb_release ( struct linda *linda ) {
struct QIB_7220_ibsd_epb_access_ctrl access;
memset ( &access, 0, sizeof ( access ) );
BIT_FILL_1 ( &access, sw_ib_epb_req, 0 );
linda_writeq ( linda, &access, QIB_7220_ibsd_epb_access_ctrl_offset );
}
/**
* Read data via IB external parallel bus
*
* @v linda Linda device
* @v location EPB location
* @ret data Data read, or negative error
*
* You must have already acquired ownership of the IB external
* parallel bus.
*/
static int linda_ib_epb_read ( struct linda *linda, unsigned int location ) {
struct QIB_7220_ibsd_epb_transaction_reg xact;
unsigned int data;
int rc;
/* Ensure no transaction is currently in progress */
if ( ( rc = linda_ib_epb_wait ( linda, &xact ) ) != 0 )
return rc;
/* Process data */
memset ( &xact, 0, sizeof ( xact ) );
BIT_FILL_3 ( &xact,
ib_epb_address, LINDA_EPB_LOC_ADDRESS ( location ),
ib_epb_read_write, LINDA_EPB_READ,
ib_epb_cs, LINDA_EPB_LOC_CS ( location ) );
linda_writeq ( linda, &xact,
QIB_7220_ibsd_epb_transaction_reg_offset );
/* Wait for transaction to complete */
if ( ( rc = linda_ib_epb_wait ( linda, &xact ) ) != 0 )
return rc;
data = BIT_GET ( &xact, ib_epb_data );
return data;
}
/**
* Write data via IB external parallel bus
*
* @v linda Linda device
* @v location EPB location
* @v data Data to write
* @ret rc Return status code
*
* You must have already acquired ownership of the IB external
* parallel bus.
*/
static int linda_ib_epb_write ( struct linda *linda, unsigned int location,
unsigned int data ) {
struct QIB_7220_ibsd_epb_transaction_reg xact;
int rc;
/* Ensure no transaction is currently in progress */
if ( ( rc = linda_ib_epb_wait ( linda, &xact ) ) != 0 )
return rc;
/* Process data */
memset ( &xact, 0, sizeof ( xact ) );
BIT_FILL_4 ( &xact,
ib_epb_data, data,
ib_epb_address, LINDA_EPB_LOC_ADDRESS ( location ),
ib_epb_read_write, LINDA_EPB_WRITE,
ib_epb_cs, LINDA_EPB_LOC_CS ( location ) );
linda_writeq ( linda, &xact,
QIB_7220_ibsd_epb_transaction_reg_offset );
/* Wait for transaction to complete */
if ( ( rc = linda_ib_epb_wait ( linda, &xact ) ) != 0 )
return rc;
return 0;
}
/**
* Read/modify/write EPB register
*
* @v linda Linda device
* @v cs Chip select
* @v channel Channel
* @v element Element
* @v reg Register
* @v value Value to set
* @v mask Mask to apply to old value
* @ret rc Return status code
*/
static int linda_ib_epb_mod_reg ( struct linda *linda, unsigned int cs,
unsigned int channel, unsigned int element,
unsigned int reg, unsigned int value,
unsigned int mask ) {
unsigned int location;
int old_value;
int rc;
DBG_DISABLE ( DBGLVL_IO );
/* Sanity check */
assert ( ( value & mask ) == value );
/* Acquire bus ownership */
if ( ( rc = linda_ib_epb_request ( linda ) ) != 0 )
goto out;
/* Read existing value, if necessary */
location = LINDA_EPB_LOC ( cs, channel, element, reg );
if ( (~mask) & 0xff ) {
old_value = linda_ib_epb_read ( linda, location );
if ( old_value < 0 ) {
rc = old_value;
goto out_release;
}
} else {
old_value = 0;
}
/* Update value */
value = ( ( old_value & ~mask ) | value );
DBGCP ( linda, "Linda %p CS %d EPB(%d,%d,%#02x) %#02x => %#02x\n",
linda, cs, channel, element, reg, old_value, value );
if ( ( rc = linda_ib_epb_write ( linda, location, value ) ) != 0 )
goto out_release;
out_release:
/* Release bus */
linda_ib_epb_release ( linda );
out:
DBG_ENABLE ( DBGLVL_IO );
return rc;
}
/**
* Transfer data to/from microcontroller RAM
*
* @v linda Linda device
* @v address Starting address
* @v write Data to write, or NULL
* @v read Data to read, or NULL
* @v len Length of data
* @ret rc Return status code
*/
static int linda_ib_epb_ram_xfer ( struct linda *linda, unsigned int address,
const void *write, void *read,
size_t len ) {
unsigned int control;
unsigned int address_hi;
unsigned int address_lo;
int data;
int rc;
DBG_DISABLE ( DBGLVL_IO );
assert ( ! ( write && read ) );
assert ( ( address % LINDA_EPB_UC_CHUNK_SIZE ) == 0 );
assert ( ( len % LINDA_EPB_UC_CHUNK_SIZE ) == 0 );
/* Acquire bus ownership */
if ( ( rc = linda_ib_epb_request ( linda ) ) != 0 )
goto out;
/* Process data */
while ( len ) {
/* Reset the address for each new chunk */
if ( ( address % LINDA_EPB_UC_CHUNK_SIZE ) == 0 ) {
/* Write the control register */
control = ( read ? LINDA_EPB_UC_CTL_READ :
LINDA_EPB_UC_CTL_WRITE );
if ( ( rc = linda_ib_epb_write ( linda,
LINDA_EPB_UC_CTL,
control ) ) != 0 )
break;
/* Write the address registers */
address_hi = ( address >> 8 );
if ( ( rc = linda_ib_epb_write ( linda,
LINDA_EPB_UC_ADDR_HI,
address_hi ) ) != 0 )
break;
address_lo = ( address & 0xff );
if ( ( rc = linda_ib_epb_write ( linda,
LINDA_EPB_UC_ADDR_LO,
address_lo ) ) != 0 )
break;
}
/* Read or write the data */
if ( read ) {
data = linda_ib_epb_read ( linda, LINDA_EPB_UC_DATA );
if ( data < 0 ) {
rc = data;
break;
}
*( ( uint8_t * ) read++ ) = data;
} else {
data = *( ( uint8_t * ) write++ );
if ( ( rc = linda_ib_epb_write ( linda,
LINDA_EPB_UC_DATA,
data ) ) != 0 )
break;
}
address++;
len--;
/* Reset the control byte after each chunk */
if ( ( address % LINDA_EPB_UC_CHUNK_SIZE ) == 0 ) {
if ( ( rc = linda_ib_epb_write ( linda,
LINDA_EPB_UC_CTL,
0 ) ) != 0 )
break;
}
}
/* Release bus */
linda_ib_epb_release ( linda );
out:
DBG_ENABLE ( DBGLVL_IO );
return rc;
}
/***************************************************************************
*
* Infiniband SerDes initialisation
*
***************************************************************************
*/
/** A Linda SerDes parameter */
struct linda_serdes_param {
/** EPB address as constructed by LINDA_EPB_ADDRESS() */
uint16_t address;
/** Value to set */
uint8_t value;
/** Mask to apply to old value */
uint8_t mask;
} __packed;
/** Magic "all channels" channel number */
#define LINDA_EPB_ALL_CHANNELS 31
/** End of SerDes parameter list marker */
#define LINDA_SERDES_PARAM_END { 0, 0, 0 }
/**
* Program IB SerDes register(s)
*
* @v linda Linda device
* @v param SerDes parameter
* @ret rc Return status code
*/
static int linda_set_serdes_param ( struct linda *linda,
struct linda_serdes_param *param ) {
unsigned int channel;
unsigned int channel_start;
unsigned int channel_end;
unsigned int element;
unsigned int reg;
int rc;
/* Break down the EPB address and determine channels */
channel = LINDA_EPB_ADDRESS_CHANNEL ( param->address );
element = LINDA_EPB_ADDRESS_ELEMENT ( param->address );
reg = LINDA_EPB_ADDRESS_REG ( param->address );
if ( channel == LINDA_EPB_ALL_CHANNELS ) {
channel_start = 0;
channel_end = 3;
} else {
channel_start = channel_end = channel;
}
/* Modify register for each specified channel */
for ( channel = channel_start ; channel <= channel_end ; channel++ ) {
if ( ( rc = linda_ib_epb_mod_reg ( linda, LINDA_EPB_CS_SERDES,
channel, element, reg,
param->value,
param->mask ) ) != 0 )
return rc;
}
return 0;
}
/**
* Program IB SerDes registers
*
* @v linda Linda device
* @v param SerDes parameters
* @v count Number of parameters
* @ret rc Return status code
*/
static int linda_set_serdes_params ( struct linda *linda,
struct linda_serdes_param *params ) {
int rc;
for ( ; params->mask != 0 ; params++ ){
if ( ( rc = linda_set_serdes_param ( linda,
params ) ) != 0 )
return rc;
}
return 0;
}
#define LINDA_DDS_VAL( amp_d, main_d, ipst_d, ipre_d, \
amp_s, main_s, ipst_s, ipre_s ) \
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 9, 0x00 ), \
( ( ( amp_d & 0x1f ) << 1 ) | 1 ), 0xff }, \
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 9, 0x01 ), \
( ( ( amp_s & 0x1f ) << 1 ) | 1 ), 0xff }, \
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 9, 0x09 ), \
( ( main_d << 3 ) | 4 | ( ipre_d >> 2 ) ), 0xff }, \
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 9, 0x0a ), \
( ( main_s << 3 ) | 4 | ( ipre_s >> 2 ) ), 0xff }, \
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 9, 0x06 ), \
( ( ( ipst_d & 0xf ) << 1 ) | \
( ( ipre_d & 3 ) << 6 ) | 0x21 ), 0xff }, \
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 9, 0x07 ), \
( ( ( ipst_s & 0xf ) << 1 ) | \
( ( ipre_s & 3 ) << 6) | 0x21 ), 0xff }
/**
* Linda SerDes default parameters
*
* These magic start-of-day values are taken from the Linux driver.
*/
static struct linda_serdes_param linda_serdes_defaults1[] = {
/* RXHSCTRL0 */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 6, 0x00 ), 0xd4, 0xff },
/* VCDL_DAC2 */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 6, 0x05 ), 0x2d, 0xff },
/* VCDL_CTRL2 */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 6, 0x08 ), 0x03, 0x0f },
/* START_EQ1 */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x27 ), 0x10, 0xff },
/* START_EQ2 */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x28 ), 0x30, 0xff },
/* BACTRL */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 6, 0x0e ), 0x40, 0xff },
/* LDOUTCTRL1 */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x06 ), 0x04, 0xff },
/* RXHSSTATUS */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 6, 0x0f ), 0x04, 0xff },
/* End of this block */
LINDA_SERDES_PARAM_END
};
static struct linda_serdes_param linda_serdes_defaults2[] = {
/* LDOUTCTRL1 */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x06 ), 0x00, 0xff },
/* DDS values */
LINDA_DDS_VAL ( 31, 19, 12, 0, 29, 22, 9, 0 ),
/* Set Rcv Eq. to Preset node */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x27 ), 0x10, 0xff },
/* DFELTHFDR */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x08 ), 0x00, 0xff },
/* DFELTHHDR */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x21 ), 0x00, 0xff },
/* TLTHFDR */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x09 ), 0x02, 0xff },
/* TLTHHDR */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x23 ), 0x02, 0xff },
/* ZFR */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x1b ), 0x0c, 0xff },
/* ZCNT) */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x1c ), 0x0c, 0xff },
/* GFR */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x1e ), 0x10, 0xff },
/* GHR */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x1f ), 0x10, 0xff },
/* VCDL_CTRL0 toggle */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 6, 0x06 ), 0x20, 0xff },
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 6, 0x06 ), 0x00, 0xff },
/* CMUCTRL5 */
{ LINDA_EPB_ADDRESS ( 7, 0, 0x15 ), 0x80, 0xff },
/* End of this block */
LINDA_SERDES_PARAM_END
};
static struct linda_serdes_param linda_serdes_defaults3[] = {
/* START_EQ1 */
{ LINDA_EPB_ADDRESS ( LINDA_EPB_ALL_CHANNELS, 7, 0x27 ), 0x00, 0x38 },
/* End of this block */
LINDA_SERDES_PARAM_END
};
/**
* Program the microcontroller RAM
*
* @v linda Linda device
* @ret rc Return status code
*/
static int linda_program_uc_ram ( struct linda *linda ) {
int rc;
if ( ( rc = linda_ib_epb_ram_xfer ( linda, 0, linda_ib_fw, NULL,
sizeof ( linda_ib_fw ) ) ) != 0 ){
DBGC ( linda, "Linda %p could not load IB firmware: %s\n",
linda, strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Verify the microcontroller RAM
*
* @v linda Linda device
* @ret rc Return status code
*/
static int linda_verify_uc_ram ( struct linda *linda ) {
uint8_t verify[LINDA_EPB_UC_CHUNK_SIZE];
unsigned int offset;
int rc;
for ( offset = 0 ; offset < sizeof ( linda_ib_fw );
offset += sizeof ( verify ) ) {
if ( ( rc = linda_ib_epb_ram_xfer ( linda, offset,
NULL, verify,
sizeof (verify) )) != 0 ){
DBGC ( linda, "Linda %p could not read back IB "
"firmware: %s\n", linda, strerror ( rc ) );
return rc;
}
if ( memcmp ( ( linda_ib_fw + offset ), verify,
sizeof ( verify ) ) != 0 ) {
DBGC ( linda, "Linda %p firmware verification failed "
"at offset %#x\n", linda, offset );
DBGC_HDA ( linda, offset, ( linda_ib_fw + offset ),
sizeof ( verify ) );
DBGC_HDA ( linda, offset, verify, sizeof ( verify ) );
return -EIO;
}
}
DBGC2 ( linda, "Linda %p firmware verified ok\n", linda );
return 0;
}
/**
* Use the microcontroller to trim the IB link
*
* @v linda Linda device
* @ret rc Return status code
*/
static int linda_trim_ib ( struct linda *linda ) {
struct QIB_7220_IBSerDesCtrl ctrl;
struct QIB_7220_IntStatus intstatus;
unsigned int i;
int rc;
/* Bring the microcontroller out of reset */
linda_readq ( linda, &ctrl, QIB_7220_IBSerDesCtrl_offset );
BIT_SET ( &ctrl, ResetIB_uC_Core, 0 );
linda_writeq ( linda, &ctrl, QIB_7220_IBSerDesCtrl_offset );
/* Wait for the "trim done" signal */
for ( i = 0 ; i < LINDA_TRIM_DONE_MAX_WAIT_MS ; i++ ) {
linda_readq ( linda, &intstatus, QIB_7220_IntStatus_offset );
if ( BIT_GET ( &intstatus, IBSerdesTrimDone ) ) {
rc = 0;
goto out_reset;
}
mdelay ( 1 );
}
DBGC ( linda, "Linda %p timed out waiting for trim done\n", linda );
rc = -ETIMEDOUT;
out_reset:
/* Put the microcontroller back into reset */
BIT_SET ( &ctrl, ResetIB_uC_Core, 1 );
linda_writeq ( linda, &ctrl, QIB_7220_IBSerDesCtrl_offset );
return rc;
}
/**
* Initialise the IB SerDes
*
* @v linda Linda device
* @ret rc Return status code
*/
static int linda_init_ib_serdes ( struct linda *linda ) {
struct QIB_7220_Control control;
struct QIB_7220_IBCCtrl ibcctrl;
struct QIB_7220_IBCDDRCtrl ibcddrctrl;
struct QIB_7220_XGXSCfg xgxscfg;
int rc;
/* Disable link */
linda_readq ( linda, &control, QIB_7220_Control_offset );
BIT_SET ( &control, LinkEn, 0 );
linda_writeq ( linda, &control, QIB_7220_Control_offset );
/* Configure sensible defaults for IBC */
memset ( &ibcctrl, 0, sizeof ( ibcctrl ) );
BIT_FILL_6 ( &ibcctrl, /* Tuning values taken from Linux driver */
FlowCtrlPeriod, 0x03,
FlowCtrlWaterMark, 0x05,
MaxPktLen, ( ( LINDA_RECV_HEADER_SIZE +
LINDA_RECV_PAYLOAD_SIZE +
4 /* ICRC */ ) >> 2 ),
PhyerrThreshold, 0xf,
OverrunThreshold, 0xf,
CreditScale, 0x4 );
linda_writeq ( linda, &ibcctrl, QIB_7220_IBCCtrl_offset );
/* Force SDR only to avoid needing all the DDR tuning,
* Mellanox compatibility hacks etc. SDR is plenty for
* boot-time operation.
*/
linda_readq ( linda, &ibcddrctrl, QIB_7220_IBCDDRCtrl_offset );
BIT_SET ( &ibcddrctrl, IB_ENHANCED_MODE, 0 );
BIT_SET ( &ibcddrctrl, SD_SPEED_SDR, 1 );
BIT_SET ( &ibcddrctrl, SD_SPEED_DDR, 0 );
BIT_SET ( &ibcddrctrl, SD_SPEED_QDR, 0 );
BIT_SET ( &ibcddrctrl, HRTBT_ENB, 0 );
BIT_SET ( &ibcddrctrl, HRTBT_AUTO, 0 );
linda_writeq ( linda, &ibcddrctrl, QIB_7220_IBCDDRCtrl_offset );
/* Set default SerDes parameters */
if ( ( rc = linda_set_serdes_params ( linda,
linda_serdes_defaults1 ) ) != 0 )
return rc;
udelay ( 415 ); /* Magic delay while SerDes sorts itself out */
if ( ( rc = linda_set_serdes_params ( linda,
linda_serdes_defaults2 ) ) != 0 )
return rc;
/* Program the microcontroller RAM */
if ( ( rc = linda_program_uc_ram ( linda ) ) != 0 )
return rc;
/* Verify the microcontroller RAM contents */
if ( DBGLVL_LOG ) {
if ( ( rc = linda_verify_uc_ram ( linda ) ) != 0 )
return rc;
}
/* More SerDes tuning */
if ( ( rc = linda_set_serdes_params ( linda,
linda_serdes_defaults3 ) ) != 0 )
return rc;
/* Use the microcontroller to trim the IB link */
if ( ( rc = linda_trim_ib ( linda ) ) != 0 )
return rc;
/* Bring XGXS out of reset */
linda_readq ( linda, &xgxscfg, QIB_7220_XGXSCfg_offset );
BIT_SET ( &xgxscfg, tx_rx_reset, 0 );
BIT_SET ( &xgxscfg, xcv_reset, 0 );
linda_writeq ( linda, &xgxscfg, QIB_7220_XGXSCfg_offset );
return rc;
}
/***************************************************************************
*
* PCI layer interface
*
***************************************************************************
*/
/**
* Probe PCI device
*
* @v pci PCI device
* @v id PCI ID
* @ret rc Return status code
*/
static int linda_probe ( struct pci_device *pci ) {
struct ib_device *ibdev;
struct linda *linda;
struct QIB_7220_Revision revision;
int rc;
/* Allocate Infiniband device */
ibdev = alloc_ibdev ( sizeof ( *linda ) );
if ( ! ibdev ) {
rc = -ENOMEM;
goto err_alloc_ibdev;
}
pci_set_drvdata ( pci, ibdev );
linda = ib_get_drvdata ( ibdev );
ibdev->op = &linda_ib_operations;
ibdev->dev = &pci->dev;
ibdev->port = 1;
ibdev->ports = 1;
/* Fix up PCI device */
adjust_pci_device ( pci );
/* Map PCI BARs */
linda->regs = pci_ioremap ( pci, pci->membase, LINDA_BAR0_SIZE );
DBGC2 ( linda, "Linda %p has BAR at %08lx\n", linda, pci->membase );
/* Print some general data */
linda_readq ( linda, &revision, QIB_7220_Revision_offset );
DBGC2 ( linda, "Linda %p board %02lx v%ld.%ld.%ld.%ld\n", linda,
BIT_GET ( &revision, BoardID ),
BIT_GET ( &revision, R_SW ),
BIT_GET ( &revision, R_Arch ),
BIT_GET ( &revision, R_ChipRevMajor ),
BIT_GET ( &revision, R_ChipRevMinor ) );
/* Record link capabilities. Note that we force SDR only to
* avoid having to carry extra code for DDR tuning etc.
*/
ibdev->link_width_enabled = ibdev->link_width_supported =
( IB_LINK_WIDTH_4X | IB_LINK_WIDTH_1X );
ibdev->link_speed_enabled = ibdev->link_speed_supported =
IB_LINK_SPEED_SDR;
/* Initialise I2C subsystem */
if ( ( rc = linda_init_i2c ( linda ) ) != 0 )
goto err_init_i2c;
/* Read EEPROM parameters */
if ( ( rc = linda_read_eeprom ( linda, &ibdev->node_guid ) ) != 0 )
goto err_read_eeprom;
memcpy ( &ibdev->gid.s.guid, &ibdev->node_guid,
sizeof ( ibdev->gid.s.guid ) );
/* Initialise send datapath */
if ( ( rc = linda_init_send ( linda ) ) != 0 )
goto err_init_send;
/* Initialise receive datapath */
if ( ( rc = linda_init_recv ( linda ) ) != 0 )
goto err_init_recv;
/* Initialise the IB SerDes */
if ( ( rc = linda_init_ib_serdes ( linda ) ) != 0 )
goto err_init_ib_serdes;
/* Register Infiniband device */
if ( ( rc = register_ibdev ( ibdev ) ) != 0 ) {
DBGC ( linda, "Linda %p could not register IB "
"device: %s\n", linda, strerror ( rc ) );
goto err_register_ibdev;
}
return 0;
unregister_ibdev ( ibdev );
err_register_ibdev:
linda_fini_recv ( linda );
err_init_recv:
linda_fini_send ( linda );
err_init_send:
err_init_ib_serdes:
err_read_eeprom:
err_init_i2c:
iounmap ( linda->regs );
ibdev_put ( ibdev );
err_alloc_ibdev:
return rc;
}
/**
* Remove PCI device
*
* @v pci PCI device
*/
static void linda_remove ( struct pci_device *pci ) {
struct ib_device *ibdev = pci_get_drvdata ( pci );
struct linda *linda = ib_get_drvdata ( ibdev );
unregister_ibdev ( ibdev );
linda_fini_recv ( linda );
linda_fini_send ( linda );
iounmap ( linda->regs );
ibdev_put ( ibdev );
}
static struct pci_device_id linda_nics[] = {
PCI_ROM ( 0x1077, 0x7220, "iba7220", "QLE7240/7280 HCA driver", 0 ),
};
struct pci_driver linda_driver __pci_driver = {
.ids = linda_nics,
.id_count = ( sizeof ( linda_nics ) / sizeof ( linda_nics[0] ) ),
.probe = linda_probe,
.remove = linda_remove,
};