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/*
* FireDTV driver (formerly known as FireSAT)
*
* Copyright (C) 2004 Andreas Monitzer <andy@monitzer.com>
* Copyright (C) 2008 Henrik Kurelid <henrik@kurelid.se>
*
* 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/kernel.h>
#include <linux/mutex.h>
#include <linux/types.h>
#include <hosts.h>
#include <ieee1394.h>
#include <ieee1394_core.h>
#include <ieee1394_transactions.h>
#include <nodemgr.h>
#include "avc_api.h"
#include "cmp.h"
#include "firesat.h"
typedef struct _OPCR
{
__u8 PTPConnCount : 6 ; // Point to point connect. counter
__u8 BrConnCount : 1 ; // Broadcast connection counter
__u8 OnLine : 1 ; // On Line
__u8 ChNr : 6 ; // Channel number
__u8 Res : 2 ; // Reserved
__u8 PayloadHi : 2 ; // Payoad high bits
__u8 OvhdID : 4 ; // Overhead ID
__u8 DataRate : 2 ; // Data Rate
__u8 PayloadLo ; // Payoad low byte
} OPCR ;
#define FIRESAT_SPEED IEEE1394_SPEED_400
static int cmp_read(struct firesat *firesat, void *buf, u64 addr, size_t len)
{
int ret;
if (mutex_lock_interruptible(&firesat->avc_mutex))
return -EINTR;
ret = hpsb_read(firesat->host, firesat->nodeentry->nodeid,
firesat->nodeentry->generation, addr, buf, len);
mutex_unlock(&firesat->avc_mutex);
return ret;
}
static int cmp_lock(struct firesat *firesat, quadlet_t *data, u64 addr,
quadlet_t arg, int ext_tcode)
{
int ret;
if (mutex_lock_interruptible(&firesat->avc_mutex))
return -EINTR;
ret = hpsb_lock(firesat->host, firesat->nodeentry->nodeid,
firesat->nodeentry->generation,
addr, ext_tcode, data, arg);
mutex_unlock(&firesat->avc_mutex);
return ret;
}
//try establishing a point-to-point connection (may be interrupted by a busreset
int try_CMPEstablishPPconnection(struct firesat *firesat, int output_plug, int iso_channel) {
unsigned int BWU; //bandwidth to allocate
quadlet_t old_oPCR,test_oPCR = 0x0;
u64 oPCR_address=0xfffff0000904ull+(output_plug << 2);
int result=cmp_read(firesat, &test_oPCR, oPCR_address, 4);
/* printk(KERN_INFO "%s: nodeid = %d\n",__func__,firesat->nodeentry->nodeid); */
if (result < 0) {
printk("%s: cannot read oPCR\n", __func__);
return result;
} else {
/* printk(KERN_INFO "%s: oPCR = %08x\n",__func__,test_oPCR); */
do {
OPCR *hilf= (OPCR*) &test_oPCR;
if (!hilf->OnLine) {
printk("%s: Output offline; oPCR: %08x\n", __func__, test_oPCR);
return -EBUSY;
} else {
quadlet_t new_oPCR;
old_oPCR=test_oPCR;
if (hilf->PTPConnCount) {
if (hilf->ChNr != iso_channel) {
printk("%s: Output plug has already connection on channel %u; cannot change it to channel %u\n",__func__,hilf->ChNr,iso_channel);
return -EBUSY;
} else
printk(KERN_INFO "%s: Overlaying existing connection; connection counter was: %u\n",__func__, hilf->PTPConnCount);
BWU=0; //we allocate no bandwidth (is this necessary?)
} else {
hilf->ChNr=iso_channel;
hilf->DataRate=FIRESAT_SPEED;
hilf->OvhdID=0; //FIXME: that is for worst case -> optimize
BWU=hilf->OvhdID?hilf->OvhdID*32:512;
BWU += (hilf->PayloadLo + (hilf->PayloadHi << 8) +3) * (2 << (3-hilf->DataRate));
/* if (allocate_1394_resources(iso_channel,BWU))
{
cout << "Allocation of resources failed\n";
return -2;
}*/
}
hilf->PTPConnCount++;
new_oPCR=test_oPCR;
/* printk(KERN_INFO "%s: trying compare_swap...\n",__func__); */
/* printk(KERN_INFO "%s: oPCR_old: %08x, oPCR_new: %08x\n",__func__, old_oPCR, new_oPCR); */
result=cmp_lock(firesat, &test_oPCR, oPCR_address, old_oPCR, 2);
if (result < 0) {
printk("%s: cannot compare_swap oPCR\n",__func__);
return result;
}
if ((old_oPCR != test_oPCR) && (!((OPCR*) &old_oPCR)->PTPConnCount))
{
printk("%s: change of oPCR failed -> freeing resources\n",__func__);
// hilf= (OPCR*) &new_oPCR;
// unsigned int BWU=hilf->OvhdID?hilf->OvhdID*32:512;
// BWU += (hilf->Payload+3) * (2 << (3-hilf->DataRate));
/* if (deallocate_1394_resources(iso_channel,BWU))
{
cout << "Deallocation of resources failed\n";
return -3;
}*/
}
}
}
while (old_oPCR != test_oPCR);
}
return 0;
}
//try breaking a point-to-point connection (may be interrupted by a busreset
int try_CMPBreakPPconnection(struct firesat *firesat, int output_plug,int iso_channel) {
quadlet_t old_oPCR,test_oPCR;
u64 oPCR_address=0xfffff0000904ull+(output_plug << 2);
int result=cmp_read(firesat, &test_oPCR, oPCR_address, 4);
/* printk(KERN_INFO "%s\n",__func__); */
if (result < 0) {
printk("%s: cannot read oPCR\n", __func__);
return result;
} else {
do {
OPCR *hilf= (OPCR*) &test_oPCR;
if (!hilf->OnLine || !hilf->PTPConnCount || hilf->ChNr != iso_channel) {
printk("%s: Output plug does not have PtP-connection on that channel; oPCR: %08x\n", __func__, test_oPCR);
return -EINVAL;
} else {
quadlet_t new_oPCR;
old_oPCR=test_oPCR;
hilf->PTPConnCount--;
new_oPCR=test_oPCR;
// printk(KERN_INFO "%s: trying compare_swap...\n", __func__);
result=cmp_lock(firesat, &test_oPCR, oPCR_address, old_oPCR, 2);
if (result < 0) {
printk("%s: cannot compare_swap oPCR\n",__func__);
return result;
}
}
} while (old_oPCR != test_oPCR);
/* hilf = (OPCR*) &old_oPCR;
if (hilf->PTPConnCount == 1) { // if we were the last owner of this connection
cout << "deallocating 1394 resources\n";
unsigned int BWU=hilf->OvhdID?hilf->OvhdID*32:512;
BWU += (hilf->PayloadLo + (hilf->PayloadHi << 8) +3) * (2 << (3-hilf->DataRate));
if (deallocate_1394_resources(iso_channel,BWU))
{
cout << "Deallocation of resources failed\n";
return -3;
}
}*/
}
return 0;
}
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