diff options
Diffstat (limited to 'arch/arm/common/icst525.c')
-rw-r--r-- | arch/arm/common/icst525.c | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/arch/arm/common/icst525.c b/arch/arm/common/icst525.c deleted file mode 100644 index 3d377c5bdef6..000000000000 --- a/arch/arm/common/icst525.c +++ /dev/null @@ -1,160 +0,0 @@ -/* - * linux/arch/arm/common/icst525.c - * - * Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * Support functions for calculating clocks/divisors for the ICST525 - * clock generators. See http://www.icst.com/ for more information - * on these devices. - */ -#include <linux/module.h> -#include <linux/kernel.h> - -#include <asm/hardware/icst525.h> - -/* - * Divisors for each OD setting. - */ -static unsigned char s2div[8] = { 10, 2, 8, 4, 5, 7, 9, 6 }; - -unsigned long icst525_khz(const struct icst525_params *p, struct icst525_vco vco) -{ - return p->ref * 2 * (vco.v + 8) / ((vco.r + 2) * s2div[vco.s]); -} - -EXPORT_SYMBOL(icst525_khz); - -/* - * Ascending divisor S values. - */ -static unsigned char idx2s[] = { 1, 3, 4, 7, 5, 2, 6, 0 }; - -struct icst525_vco -icst525_khz_to_vco(const struct icst525_params *p, unsigned long freq) -{ - struct icst525_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 * s2div[idx2s[i]]; - - /* - * f must be between 10MHz and - * 320MHz (5V) or 200MHz (3V) - */ - if (f > 10000 && f <= p->vco_max) - break; - } while (i < ARRAY_SIZE(idx2s)); - - if (i >= ARRAY_SIZE(idx2s)) - return vco; - - vco.s = 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(icst525_khz_to_vco); - -struct icst525_vco -icst525_ps_to_vco(const struct icst525_params *p, unsigned long period) -{ - struct icst525_vco vco = { .s = 1, .v = p->vd_max, .r = p->rd_max }; - unsigned long f, ps; - unsigned int i = 0, rd, best = (unsigned int)-1; - - ps = 1000000000UL / p->vco_max; - - /* - * First, find the PLL output divisor such - * that the PLL output is within spec. - */ - do { - f = period / s2div[idx2s[i]]; - - /* - * f must be between 10MHz and - * 320MHz (5V) or 200MHz (3V) - */ - if (f >= ps && f < 100000) - break; - } while (i < ARRAY_SIZE(idx2s)); - - if (i >= ARRAY_SIZE(idx2s)) - return vco; - - vco.s = idx2s[i]; - - ps = 500000000UL / p->ref; - - /* - * 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 f_in_div, f_pll; - unsigned int vd; - int f_diff; - - f_in_div = ps * rd; - - vd = (f_in_div + f / 2) / f; - if (vd < p->vd_min || vd > p->vd_max) - continue; - - f_pll = (f_in_div + vd / 2) / 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(icst525_ps_to_vco); |