litmus-rt.git - The LITMUS^RT kernel.

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The LITMUS^RT kernel.

Bjoern Brandenburg

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path: root/include/linux/platform_data/drv260x-pdata.h

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opt">]); } EXPORT_SYMBOL(icst_hz); /* * Ascending divisor S values. */ const unsigned char icst307_idx2s[8] = { 1, 6, 3, 4, 7, 5, 2, 0 }; const unsigned char icst525_idx2s[8] = { 1, 3, 4, 7, 5, 2, 6, 0 }; EXPORT_SYMBOL(icst307_idx2s); EXPORT_SYMBOL(icst525_idx2s); struct icst_vco icst_hz_to_vco(const struct icst_params *p, unsigned long freq) { struct icst_vco vco = { .s = 1, .v = p->vd_max, .r = p->rd_max }; unsigned long f; unsigned int i = 0, rd, best = (unsigned int)-1; /* * First, find the PLL output divisor such * that the PLL output is within spec. */ do { f = freq * p->s2div[p->idx2s[i]]; if (f > p->vco_min && f <= p->vco_max) break; } while (i < 8); if (i >= 8) return vco; vco.s = p->idx2s[i]; /* * Now find the closest divisor combination * which gives a PLL output of 'f'. */ for (rd = p->rd_min; rd <= p->rd_max; rd++) { unsigned long fref_div, f_pll; unsigned int vd; int f_diff; fref_div = (2 * p->ref) / rd; vd = (f + fref_div / 2) / fref_div; if (vd < p->vd_min || vd > p->vd_max) continue; f_pll = fref_div * vd; f_diff = f_pll - f; if (f_diff < 0) f_diff = -f_diff; if ((unsigned)f_diff < best) { vco.v = vd - 8; vco.r = rd - 2; if (f_diff == 0) break; best = f_diff; } } return vco; } EXPORT_SYMBOL(icst_hz_to_vco);


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