Commit 3f7440a6 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: Clean up 64bit division functions



Replace the house-made div64_32() with the standard div_u64*() functions.
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 3218911f
......@@ -486,80 +486,6 @@ void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
void snd_pcm_vma_notify_data(void *client, void *data);
int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
#if BITS_PER_LONG >= 64
static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
{
*rem = *n % div;
*n /= div;
}
#elif defined(i386)
static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
{
u_int32_t low, high;
low = *n & 0xffffffff;
high = *n >> 32;
if (high) {
u_int32_t high1 = high % div;
high /= div;
asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
*n = (u_int64_t)high << 32 | low;
} else {
*n = low / div;
*rem = low % div;
}
}
#else
static inline void divl(u_int32_t high, u_int32_t low,
u_int32_t div,
u_int32_t *q, u_int32_t *r)
{
u_int64_t n = (u_int64_t)high << 32 | low;
u_int64_t d = (u_int64_t)div << 31;
u_int32_t q1 = 0;
int c = 32;
while (n > 0xffffffffU) {
q1 <<= 1;
if (n >= d) {
n -= d;
q1 |= 1;
}
d >>= 1;
c--;
}
q1 <<= c;
if (n) {
low = n;
*q = q1 | (low / div);
*r = low % div;
} else {
*r = 0;
*q = q1;
}
return;
}
static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
{
u_int32_t low, high;
low = *n & 0xffffffff;
high = *n >> 32;
if (high) {
u_int32_t high1 = high % div;
u_int32_t low1 = low;
high /= div;
divl(high1, low1, div, &low, rem);
*n = (u_int64_t)high << 32 | low;
} else {
*n = low / div;
*rem = low % div;
}
}
#endif
/*
* PCM library
*/
......
......@@ -31,6 +31,7 @@
#include <linux/time.h>
#include <linux/vmalloc.h>
#include <linux/moduleparam.h>
#include <linux/math64.h>
#include <linux/string.h>
#include <sound/core.h>
#include <sound/minors.h>
......@@ -617,9 +618,7 @@ static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
#else
{
u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
u32 rem;
div64_32(&bsize, buffer_size, &rem);
return (long)bsize;
return div_u64(bsize, buffer_size);
}
#endif
}
......
......@@ -22,6 +22,7 @@
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/math64.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/info.h>
......@@ -452,7 +453,7 @@ static inline unsigned int muldiv32(unsigned int a, unsigned int b,
*r = 0;
return UINT_MAX;
}
div64_32(&n, c, r);
n = div_u64_rem(n, c, r);
if (n >= UINT_MAX) {
*r = 0;
return UINT_MAX;
......
......@@ -28,6 +28,7 @@
#include <linux/pci.h>
#include <linux/firmware.h>
#include <linux/moduleparam.h>
#include <linux/math64.h>
#include <sound/core.h>
#include <sound/control.h>
......@@ -1047,7 +1048,6 @@ static int hdsp_set_interrupt_interval(struct hdsp *s, unsigned int frames)
static void hdsp_set_dds_value(struct hdsp *hdsp, int rate)
{
u64 n;
u32 r;
if (rate >= 112000)
rate /= 4;
......@@ -1055,7 +1055,7 @@ static void hdsp_set_dds_value(struct hdsp *hdsp, int rate)
rate /= 2;
n = DDS_NUMERATOR;
div64_32(&n, rate, &r);
n = div_u64(n, rate);
/* n should be less than 2^32 for being written to FREQ register */
snd_BUG_ON(n >> 32);
/* HDSP_freqReg and HDSP_resetPointer are the same, so keep the DDS
......@@ -3097,7 +3097,6 @@ static int snd_hdsp_get_adat_sync_check(struct snd_kcontrol *kcontrol, struct sn
static int hdsp_dds_offset(struct hdsp *hdsp)
{
u64 n;
u32 r;
unsigned int dds_value = hdsp->dds_value;
int system_sample_rate = hdsp->system_sample_rate;
......@@ -3109,7 +3108,7 @@ static int hdsp_dds_offset(struct hdsp *hdsp)
* dds_value = n / rate
* rate = n / dds_value
*/
div64_32(&n, dds_value, &r);
n = div_u64(n, dds_value);
if (system_sample_rate >= 112000)
n *= 4;
else if (system_sample_rate >= 56000)
......
......@@ -29,6 +29,7 @@
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/math64.h>
#include <asm/io.h>
#include <sound/core.h>
......@@ -831,7 +832,6 @@ static int hdspm_set_interrupt_interval(struct hdspm * s, unsigned int frames)
static void hdspm_set_dds_value(struct hdspm *hdspm, int rate)
{
u64 n;
u32 r;
if (rate >= 112000)
rate /= 4;
......@@ -844,7 +844,7 @@ static void hdspm_set_dds_value(struct hdspm *hdspm, int rate)
*/
/* n = 104857600000000ULL; */ /* = 2^20 * 10^8 */
n = 110100480000000ULL; /* Value checked for AES32 and MADI */
div64_32(&n, rate, &r);
n = div_u64(n, rate);
/* n should be less than 2^32 for being written to FREQ register */
snd_BUG_ON(n >> 32);
hdspm_write(hdspm, HDSPM_freqReg, (u32)n);
......
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