ALSA: Clean up 64bit division functions

Replace the house-made div64_32() with the standard div_u64*() functions.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

5 files changed, 9 insertions, 84 deletions

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index c17296891617..0caf71e16944 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -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
  */
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index dda000b9684c..dbe406b82591 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -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
 }
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index d659995ac3ac..a7482874c451 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -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;
diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
index 314e73531bd1..bcfdbb5ebc40 100644
--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -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)
diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index bac2dc0c5d85..0dce331a2a3b 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -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);