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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/device.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/types.h>
#include <asm/byteorder.h>
#include <ieee1394.h>
#include <nodemgr.h>
#include "avc.h"
#include "cmp.h"
#include "firedtv.h"
#define CMP_OUTPUT_PLUG_CONTROL_REG_0 0xfffff0000904ULL
static int cmp_read(struct firedtv *fdtv, void *buf, u64 addr, size_t len)
{
int ret;
if (mutex_lock_interruptible(&fdtv->avc_mutex))
return -EINTR;
ret = hpsb_node_read(fdtv->ud->ne, addr, buf, len);
if (ret < 0)
dev_err(&fdtv->ud->device, "CMP: read I/O error\n");
mutex_unlock(&fdtv->avc_mutex);
return ret;
}
static int cmp_lock(struct firedtv *fdtv, void *data, u64 addr, __be32 arg,
int ext_tcode)
{
int ret;
if (mutex_lock_interruptible(&fdtv->avc_mutex))
return -EINTR;
ret = hpsb_node_lock(fdtv->ud->ne, addr, ext_tcode, data,
(__force quadlet_t)arg);
if (ret < 0)
dev_err(&fdtv->ud->device, "CMP: lock I/O error\n");
mutex_unlock(&fdtv->avc_mutex);
return ret;
}
static inline u32 get_opcr(__be32 opcr, u32 mask, u32 shift)
{
return (be32_to_cpu(opcr) >> shift) & mask;
}
static inline void set_opcr(__be32 *opcr, u32 value, u32 mask, u32 shift)
{
*opcr &= ~cpu_to_be32(mask << shift);
*opcr |= cpu_to_be32((value & mask) << shift);
}
#define get_opcr_online(v) get_opcr((v), 0x1, 31)
#define get_opcr_p2p_connections(v) get_opcr((v), 0x3f, 24)
#define get_opcr_channel(v) get_opcr((v), 0x3f, 16)
#define set_opcr_p2p_connections(p, v) set_opcr((p), (v), 0x3f, 24)
#define set_opcr_channel(p, v) set_opcr((p), (v), 0x3f, 16)
#define set_opcr_data_rate(p, v) set_opcr((p), (v), 0x3, 14)
#define set_opcr_overhead_id(p, v) set_opcr((p), (v), 0xf, 10)
int cmp_establish_pp_connection(struct firedtv *fdtv, int plug, int channel)
{
__be32 old_opcr, opcr;
u64 opcr_address = CMP_OUTPUT_PLUG_CONTROL_REG_0 + (plug << 2);
int attempts = 0;
int ret;
ret = cmp_read(fdtv, &opcr, opcr_address, 4);
if (ret < 0)
return ret;
repeat:
if (!get_opcr_online(opcr)) {
dev_err(&fdtv->ud->device, "CMP: output offline\n");
return -EBUSY;
}
old_opcr = opcr;
if (get_opcr_p2p_connections(opcr)) {
if (get_opcr_channel(opcr) != channel) {
dev_err(&fdtv->ud->device,
"CMP: cannot change channel\n");
return -EBUSY;
}
dev_info(&fdtv->ud->device,
"CMP: overlaying existing connection\n");
/* We don't allocate isochronous resources. */
} else {
set_opcr_channel(&opcr, channel);
set_opcr_data_rate(&opcr, IEEE1394_SPEED_400);
/* FIXME: this is for the worst case - optimize */
set_opcr_overhead_id(&opcr, 0);
/* FIXME: allocate isochronous channel and bandwidth at IRM */
}
set_opcr_p2p_connections(&opcr, get_opcr_p2p_connections(opcr) + 1);
ret = cmp_lock(fdtv, &opcr, opcr_address, old_opcr, 2);
if (ret < 0)
return ret;
if (old_opcr != opcr) {
/*
* FIXME: if old_opcr.P2P_Connections > 0,
* deallocate isochronous channel and bandwidth at IRM
*/
if (++attempts < 6) /* arbitrary limit */
goto repeat;
return -EBUSY;
}
return 0;
}
void cmp_break_pp_connection(struct firedtv *fdtv, int plug, int channel)
{
__be32 old_opcr, opcr;
u64 opcr_address = CMP_OUTPUT_PLUG_CONTROL_REG_0 + (plug << 2);
int attempts = 0;
if (cmp_read(fdtv, &opcr, opcr_address, 4) < 0)
return;
repeat:
if (!get_opcr_online(opcr) || !get_opcr_p2p_connections(opcr) ||
get_opcr_channel(opcr) != channel) {
dev_err(&fdtv->ud->device, "CMP: no connection to break\n");
return;
}
old_opcr = opcr;
set_opcr_p2p_connections(&opcr, get_opcr_p2p_connections(opcr) - 1);
if (cmp_lock(fdtv, &opcr, opcr_address, old_opcr, 2) < 0)
return;
if (old_opcr != opcr) {
/*
* FIXME: if old_opcr.P2P_Connections == 1, i.e. we were last
* owner, deallocate isochronous channel and bandwidth at IRM
*/
if (++attempts < 6) /* arbitrary limit */
goto repeat;
}
}
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