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authorAneesh V <aneesh@ti.com>2011-11-21 23:38:57 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2011-12-06 23:59:34 +0100
commit28a181ff81826bfa53f42c9790cc7397ef9a2dc9 (patch)
tree016d0b15baf0bb7b31b6f42ead09744257000f87
parente4fce34e7a5f484de2ca557fd43a198fd14894b7 (diff)
downloadu-boot-linaro-stable-28a181ff81826bfa53f42c9790cc7397ef9a2dc9.tar.gz
omap: Improve PLL parameter calculation tool
Improve the tool that finds multiplier and divider for PLLs: The previous algorithm could get stuck on local maxima and required the user to specify the tolerance. Improve the algorithm to go through the entire search space and find the optimal solution. Signed-off-by: Aneesh V <aneesh@ti.com>
-rw-r--r--tools/omap/clocks_get_m_n.c187
1 files changed, 96 insertions, 91 deletions
diff --git a/tools/omap/clocks_get_m_n.c b/tools/omap/clocks_get_m_n.c
index cfc176042..c27577b70 100644
--- a/tools/omap/clocks_get_m_n.c
+++ b/tools/omap/clocks_get_m_n.c
@@ -63,45 +63,41 @@ typedef unsigned int u32;
* $ gcc clocks_get_m_n.c
* $ ./a.out
*/
-int get_m_n_optimized(u32 target_freq_khz, u32 ref_freq_khz, u32 *m, u32 *n,
- u32 tolerance_khz)
+int get_m_n_optimized(u32 target_freq_khz, u32 ref_freq_khz, u32 *M, u32 *N)
{
- u32 min_freq = target_freq_khz - tolerance_khz;
- u32 max_freq = target_freq_khz;
- u32 freq, freq_old;
- *n = 1;
+ u32 freq = target_freq_khz;
+ u32 m_optimal, n_optimal, freq_optimal = 0, freq_old;
+ u32 m, n;
+ n = 1;
while (1) {
- *m = min_freq / ref_freq_khz / 2 * (*n) ;
+ m = target_freq_khz / ref_freq_khz / 2 * n;
freq_old = 0;
while (1) {
- freq = ref_freq_khz * 2 * (*m) / (*n);
- if (abs(target_freq_khz - freq_old) <=
- abs(target_freq_khz - freq)) {
+ freq = ref_freq_khz * 2 * m / n;
+ if (freq > target_freq_khz) {
freq = freq_old;
- (*m)--;
+ m--;
break;
}
- (*m)++;
+ m++;
freq_old = freq;
}
- if (freq >= min_freq && freq <= max_freq)
+ if (freq > freq_optimal) {
+ freq_optimal = freq;
+ m_optimal = m;
+ n_optimal = n;
+ }
+ n++;
+ if ((freq_optimal == target_freq_khz) ||
+ ((ref_freq_khz / n) < 1000)) {
break;
- (*n)++;
- if ((*n) > MAX_N + 1) {
- printf("ref %d m %d n %d target %d : ",
- ref_freq_khz, *m, *n, target_freq_khz);
- printf("can not find m & n - please consider"
- " increasing tolerance\n");
- return -1;
}
}
- (*n)--;
- printf("ref %d m %d n %d target %d locked %d\n",
- ref_freq_khz, *m, *n, target_freq_khz, freq);
- if ((ref_freq_khz / (*n + 1)) < 1000) {
- printf("\tREFCLK - CLKINP/(N+1) is less than 1 MHz - less than"
- " ideal, locking time will be high!\n");
- }
+ n--;
+ *M = m_optimal;
+ *N = n_optimal - 1;
+ printf("ref %d m %d n %d target %d locked %d\n", ref_freq_khz,
+ m_optimal, n_optimal - 1, target_freq_khz, freq_optimal);
return 0;
}
@@ -109,89 +105,98 @@ void main(void)
{
u32 m, n;
printf("\nMPU - 2000000\n");
- get_m_n_optimized(2000000, 12000, &m, &n, 0);
- get_m_n_optimized(2000000, 13000, &m, &n, 0);
- get_m_n_optimized(2000000, 16800, &m, &n, 800);
- get_m_n_optimized(2000000, 19200, &m, &n, 0);
- get_m_n_optimized(2000000, 26000, &m, &n, 0);
- get_m_n_optimized(2000000, 27000, &m, &n, 0);
- get_m_n_optimized(2000000, 38400, &m, &n, 0);
+ get_m_n_optimized(2000000, 12000, &m, &n);
+ get_m_n_optimized(2000000, 13000, &m, &n);
+ get_m_n_optimized(2000000, 16800, &m, &n);
+ get_m_n_optimized(2000000, 19200, &m, &n);
+ get_m_n_optimized(2000000, 26000, &m, &n);
+ get_m_n_optimized(2000000, 27000, &m, &n);
+ get_m_n_optimized(2000000, 38400, &m, &n);
printf("\nMPU - 1200000\n");
- get_m_n_optimized(1200000, 12000, &m, &n, 0);
- get_m_n_optimized(1200000, 13000, &m, &n, 0);
- get_m_n_optimized(1200000, 16800, &m, &n, 800);
- get_m_n_optimized(1200000, 19200, &m, &n, 0);
- get_m_n_optimized(1200000, 26000, &m, &n, 0);
- get_m_n_optimized(1200000, 27000, &m, &n, 0);
- get_m_n_optimized(1200000, 38400, &m, &n, 0);
+ get_m_n_optimized(1200000, 12000, &m, &n);
+ get_m_n_optimized(1200000, 13000, &m, &n);
+ get_m_n_optimized(1200000, 16800, &m, &n);
+ get_m_n_optimized(1200000, 19200, &m, &n);
+ get_m_n_optimized(1200000, 26000, &m, &n);
+ get_m_n_optimized(1200000, 27000, &m, &n);
+ get_m_n_optimized(1200000, 38400, &m, &n);
printf("\nMPU - 1584000\n");
- get_m_n_optimized(1584000, 12000, &m, &n, 0);
- get_m_n_optimized(1584000, 13000, &m, &n, 0);
- get_m_n_optimized(1584000, 16800, &m, &n, 400);
- get_m_n_optimized(1584000, 19200, &m, &n, 0);
- get_m_n_optimized(1584000, 26000, &m, &n, 0);
- get_m_n_optimized(1584000, 27000, &m, &n, 0);
- get_m_n_optimized(1584000, 38400, &m, &n, 0);
+ get_m_n_optimized(1584000, 12000, &m, &n);
+ get_m_n_optimized(1584000, 13000, &m, &n);
+ get_m_n_optimized(1584000, 16800, &m, &n);
+ get_m_n_optimized(1584000, 19200, &m, &n);
+ get_m_n_optimized(1584000, 26000, &m, &n);
+ get_m_n_optimized(1584000, 27000, &m, &n);
+ get_m_n_optimized(1584000, 38400, &m, &n);
printf("\nCore 1600000\n");
- get_m_n_optimized(1600000, 12000, &m, &n, 0);
- get_m_n_optimized(1600000, 13000, &m, &n, 0);
- get_m_n_optimized(1600000, 16800, &m, &n, 200);
- get_m_n_optimized(1600000, 19200, &m, &n, 0);
- get_m_n_optimized(1600000, 26000, &m, &n, 0);
- get_m_n_optimized(1600000, 27000, &m, &n, 0);
- get_m_n_optimized(1600000, 38400, &m, &n, 0);
+ get_m_n_optimized(1600000, 12000, &m, &n);
+ get_m_n_optimized(1600000, 13000, &m, &n);
+ get_m_n_optimized(1600000, 16800, &m, &n);
+ get_m_n_optimized(1600000, 19200, &m, &n);
+ get_m_n_optimized(1600000, 26000, &m, &n);
+ get_m_n_optimized(1600000, 27000, &m, &n);
+ get_m_n_optimized(1600000, 38400, &m, &n);
printf("\nPER 1536000\n");
- get_m_n_optimized(1536000, 12000, &m, &n, 0);
- get_m_n_optimized(1536000, 13000, &m, &n, 0);
- get_m_n_optimized(1536000, 16800, &m, &n, 0);
- get_m_n_optimized(1536000, 19200, &m, &n, 0);
- get_m_n_optimized(1536000, 26000, &m, &n, 0);
- get_m_n_optimized(1536000, 27000, &m, &n, 0);
- get_m_n_optimized(1536000, 38400, &m, &n, 0);
+ get_m_n_optimized(1536000, 12000, &m, &n);
+ get_m_n_optimized(1536000, 13000, &m, &n);
+ get_m_n_optimized(1536000, 16800, &m, &n);
+ get_m_n_optimized(1536000, 19200, &m, &n);
+ get_m_n_optimized(1536000, 26000, &m, &n);
+ get_m_n_optimized(1536000, 27000, &m, &n);
+ get_m_n_optimized(1536000, 38400, &m, &n);
printf("\nIVA 1862000\n");
- get_m_n_optimized(1862000, 12000, &m, &n, 0);
- get_m_n_optimized(1862000, 13000, &m, &n, 0);
- get_m_n_optimized(1862000, 16800, &m, &n, 0);
- get_m_n_optimized(1862000, 19200, &m, &n, 900);
- get_m_n_optimized(1862000, 26000, &m, &n, 0);
- get_m_n_optimized(1862000, 27000, &m, &n, 0);
- get_m_n_optimized(1862000, 38400, &m, &n, 800);
+ get_m_n_optimized(1862000, 12000, &m, &n);
+ get_m_n_optimized(1862000, 13000, &m, &n);
+ get_m_n_optimized(1862000, 16800, &m, &n);
+ get_m_n_optimized(1862000, 19200, &m, &n);
+ get_m_n_optimized(1862000, 26000, &m, &n);
+ get_m_n_optimized(1862000, 27000, &m, &n);
+ get_m_n_optimized(1862000, 38400, &m, &n);
+
+ printf("\nIVA Nitro - 1290000\n");
+ get_m_n_optimized(1290000, 12000, &m, &n);
+ get_m_n_optimized(1290000, 13000, &m, &n);
+ get_m_n_optimized(1290000, 16800, &m, &n);
+ get_m_n_optimized(1290000, 19200, &m, &n);
+ get_m_n_optimized(1290000, 26000, &m, &n);
+ get_m_n_optimized(1290000, 27000, &m, &n);
+ get_m_n_optimized(1290000, 38400, &m, &n);
printf("\nABE 196608 sys clk\n");
- get_m_n_optimized(196608, 12000, &m, &n, 700);
- get_m_n_optimized(196608, 13000, &m, &n, 200);
- get_m_n_optimized(196608, 16800, &m, &n, 700);
- get_m_n_optimized(196608, 19200, &m, &n, 400);
- get_m_n_optimized(196608, 26000, &m, &n, 200);
- get_m_n_optimized(196608, 27000, &m, &n, 900);
- get_m_n_optimized(196608, 38400, &m, &n, 0);
+ get_m_n_optimized(196608, 12000, &m, &n);
+ get_m_n_optimized(196608, 13000, &m, &n);
+ get_m_n_optimized(196608, 16800, &m, &n);
+ get_m_n_optimized(196608, 19200, &m, &n);
+ get_m_n_optimized(196608, 26000, &m, &n);
+ get_m_n_optimized(196608, 27000, &m, &n);
+ get_m_n_optimized(196608, 38400, &m, &n);
printf("\nABE 196608 32K\n");
- get_m_n_optimized(196608000/4, 32768, &m, &n, 0);
+ get_m_n_optimized(196608000/4, 32768, &m, &n);
printf("\nUSB 1920000\n");
- get_m_n_optimized(1920000, 12000, &m, &n, 0);
- get_m_n_optimized(1920000, 13000, &m, &n, 0);
- get_m_n_optimized(1920000, 16800, &m, &n, 0);
- get_m_n_optimized(1920000, 19200, &m, &n, 0);
- get_m_n_optimized(1920000, 26000, &m, &n, 0);
- get_m_n_optimized(1920000, 27000, &m, &n, 0);
- get_m_n_optimized(1920000, 38400, &m, &n, 0);
+ get_m_n_optimized(1920000, 12000, &m, &n);
+ get_m_n_optimized(1920000, 13000, &m, &n);
+ get_m_n_optimized(1920000, 16800, &m, &n);
+ get_m_n_optimized(1920000, 19200, &m, &n);
+ get_m_n_optimized(1920000, 26000, &m, &n);
+ get_m_n_optimized(1920000, 27000, &m, &n);
+ get_m_n_optimized(1920000, 38400, &m, &n);
printf("\nCore ES1 1523712\n");
- get_m_n_optimized(1524000, 12000, &m, &n, 100);
- get_m_n_optimized(1524000, 13000, &m, &n, 0);
- get_m_n_optimized(1524000, 16800, &m, &n, 0);
- get_m_n_optimized(1524000, 19200, &m, &n, 0);
- get_m_n_optimized(1524000, 26000, &m, &n, 0);
- get_m_n_optimized(1524000, 27000, &m, &n, 0);
+ get_m_n_optimized(1524000, 12000, &m, &n);
+ get_m_n_optimized(1524000, 13000, &m, &n);
+ get_m_n_optimized(1524000, 16800, &m, &n);
+ get_m_n_optimized(1524000, 19200, &m, &n);
+ get_m_n_optimized(1524000, 26000, &m, &n);
+ get_m_n_optimized(1524000, 27000, &m, &n);
/* exact recommendation for SDPs */
- get_m_n_optimized(1523712, 38400, &m, &n, 0);
+ get_m_n_optimized(1523712, 38400, &m, &n);
}