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Merge branch 'topic/div64-cleanup' into for-linus
* topic/div64-cleanup: ALSA: Clean up 64bit division functions
This commit is contained in:
Takashi Iwai
commit
19b1a15a3d
5 changed files with 9 additions and 84 deletions
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@ -486,80 +486,6 @@ void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
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void snd_pcm_vma_notify_data(void *client, void *data);
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int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
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#if BITS_PER_LONG >= 64
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static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
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{
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*rem = *n % div;
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*n /= div;
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}
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#elif defined(i386)
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static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
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{
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u_int32_t low, high;
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low = *n & 0xffffffff;
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high = *n >> 32;
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if (high) {
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u_int32_t high1 = high % div;
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high /= div;
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asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
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*n = (u_int64_t)high << 32 | low;
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} else {
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*n = low / div;
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*rem = low % div;
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}
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}
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#else
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static inline void divl(u_int32_t high, u_int32_t low,
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u_int32_t div,
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u_int32_t *q, u_int32_t *r)
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{
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u_int64_t n = (u_int64_t)high << 32 | low;
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u_int64_t d = (u_int64_t)div << 31;
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u_int32_t q1 = 0;
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int c = 32;
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while (n > 0xffffffffU) {
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q1 <<= 1;
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if (n >= d) {
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n -= d;
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q1 |= 1;
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}
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d >>= 1;
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c--;
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}
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q1 <<= c;
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if (n) {
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low = n;
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*q = q1 | (low / div);
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*r = low % div;
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} else {
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*r = 0;
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*q = q1;
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}
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return;
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}
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static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
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{
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u_int32_t low, high;
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low = *n & 0xffffffff;
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high = *n >> 32;
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if (high) {
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u_int32_t high1 = high % div;
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u_int32_t low1 = low;
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high /= div;
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divl(high1, low1, div, &low, rem);
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*n = (u_int64_t)high << 32 | low;
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} else {
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*n = low / div;
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*rem = low % div;
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}
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}
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#endif
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/*
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* PCM library
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*/
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@ -31,6 +31,7 @@
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#include <linux/time.h>
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#include <linux/vmalloc.h>
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#include <linux/moduleparam.h>
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#include <linux/math64.h>
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#include <linux/string.h>
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#include <sound/core.h>
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#include <sound/minors.h>
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@ -617,9 +618,7 @@ static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
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#else
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{
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u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
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u32 rem;
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div64_32(&bsize, buffer_size, &rem);
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return (long)bsize;
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return div_u64(bsize, buffer_size);
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}
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#endif
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}
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@ -22,6 +22,7 @@
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/math64.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include <sound/info.h>
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@ -452,7 +453,7 @@ static inline unsigned int muldiv32(unsigned int a, unsigned int b,
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*r = 0;
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return UINT_MAX;
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}
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div64_32(&n, c, r);
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n = div_u64_rem(n, c, r);
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if (n >= UINT_MAX) {
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*r = 0;
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return UINT_MAX;
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@ -28,6 +28,7 @@
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#include <linux/pci.h>
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#include <linux/firmware.h>
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#include <linux/moduleparam.h>
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#include <linux/math64.h>
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#include <sound/core.h>
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#include <sound/control.h>
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@ -1047,7 +1048,6 @@ static int hdsp_set_interrupt_interval(struct hdsp *s, unsigned int frames)
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static void hdsp_set_dds_value(struct hdsp *hdsp, int rate)
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{
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u64 n;
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u32 r;
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if (rate >= 112000)
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rate /= 4;
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@ -1055,7 +1055,7 @@ static void hdsp_set_dds_value(struct hdsp *hdsp, int rate)
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rate /= 2;
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n = DDS_NUMERATOR;
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div64_32(&n, rate, &r);
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n = div_u64(n, rate);
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/* n should be less than 2^32 for being written to FREQ register */
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snd_BUG_ON(n >> 32);
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/* HDSP_freqReg and HDSP_resetPointer are the same, so keep the DDS
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@ -3097,7 +3097,6 @@ static int snd_hdsp_get_adat_sync_check(struct snd_kcontrol *kcontrol, struct sn
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static int hdsp_dds_offset(struct hdsp *hdsp)
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{
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u64 n;
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u32 r;
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unsigned int dds_value = hdsp->dds_value;
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int system_sample_rate = hdsp->system_sample_rate;
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@ -3109,7 +3108,7 @@ static int hdsp_dds_offset(struct hdsp *hdsp)
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* dds_value = n / rate
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* rate = n / dds_value
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*/
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div64_32(&n, dds_value, &r);
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n = div_u64(n, dds_value);
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if (system_sample_rate >= 112000)
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n *= 4;
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else if (system_sample_rate >= 56000)
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@ -29,6 +29,7 @@
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <linux/math64.h>
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#include <asm/io.h>
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#include <sound/core.h>
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@ -831,7 +832,6 @@ static int hdspm_set_interrupt_interval(struct hdspm * s, unsigned int frames)
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static void hdspm_set_dds_value(struct hdspm *hdspm, int rate)
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{
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u64 n;
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u32 r;
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if (rate >= 112000)
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rate /= 4;
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@ -844,7 +844,7 @@ static void hdspm_set_dds_value(struct hdspm *hdspm, int rate)
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*/
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/* n = 104857600000000ULL; */ /* = 2^20 * 10^8 */
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n = 110100480000000ULL; /* Value checked for AES32 and MADI */
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div64_32(&n, rate, &r);
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n = div_u64(n, rate);
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/* n should be less than 2^32 for being written to FREQ register */
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snd_BUG_ON(n >> 32);
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hdspm_write(hdspm, HDSPM_freqReg, (u32)n);
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