/*
* Copies the given data to the given offset in card memory, reversing the word order of each 32-bit dword.
* This can be used to swap left/right channels in an audio stream, for example. This function will truncate
* length to a multiple of four.
*/
void tl880_memcpy_swahw32(struct tl880_dev *tl880dev, void *src, u32 addr, size_t length) /* {{{ */
{
u32 i;
u32 *src32 = src;
static int printme = 1;
if(CHECK_NULL(tl880dev) || CHECK_NULL(src)) {
return;
}
if(addr > tl880dev->memlen) {
return;
}
if(addr + length > tl880dev->memlen) {
length = tl880dev->memlen - addr;
}
if(debug > 1) {
printk(KERN_DEBUG "tl880: memcpy_swahw32 to 0x%07x length 0x%06lx\n", addr, length);
}
for(i = addr; i < addr + length; i += 4) {
if(printme) {
printk(KERN_DEBUG "writing 0x%08x to 0x%07x\n", src32[i/4], i);
}
tl880_write_memory(tl880dev, i, swahw32(src32[i / 4]));
}
printme = 0;
} /* }}} */
/*
* Crude but fast random-number generator. Uses a linear congruential
* generator, with occasional help from cpu_clock().
*/
static unsigned long
rcu_random(struct rcu_random_state *rrsp)
{
if (--rrsp->rrs_count < 0) {
rrsp->rrs_state += (unsigned long)local_clock();
rrsp->rrs_count = RCU_RANDOM_REFRESH;
}
rrsp->rrs_state = rrsp->rrs_state * RCU_RANDOM_MULT + RCU_RANDOM_ADD;
return swahw32(rrsp->rrs_state);
}
/*
* Crude but fast random-number generator. Uses a linear congruential
* generator, with occasional help from cpu_clock().
*/
static unsigned long
rcu_random(struct rcu_random_state *rrsp)
{
if (--rrsp->rrs_count < 0) {
rrsp->rrs_state +=
(unsigned long)cpu_clock(raw_smp_processor_id());
rrsp->rrs_count = RCU_RANDOM_REFRESH;
}
rrsp->rrs_state = rrsp->rrs_state * RCU_RANDOM_MULT + RCU_RANDOM_ADD;
return swahw32(rrsp->rrs_state);
}
