| /*************************************************************************** |
| * __________ __ ___. |
| * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| * \/ \/ \/ \/ \/ |
| * $Id$ |
| * |
| * Copyright (C) 2006 by Linus Nielsen Feltzing |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| * KIND, either express or implied. |
| * |
| ****************************************************************************/ |
| #include "config.h" |
| #include "cpu.h" |
| #include "kernel.h" |
| #include "system.h" |
| #include "power.h" |
| #include "timer.h" |
| |
| /* Settings for all possible clock frequencies (with properly working timers) |
| * NOTE: Some 5249 chips don't like having PLLDIV set to 0. We must avoid that! |
| * |
| * xxx_REFRESH_TIMER below |
| * system.h, CPUFREQ_xxx_MULT | |
| * | | |
| * V V |
| * PLLCR & Rftim. IDECONFIG1/IDECONFIG2 |
| * CPUCLK/Hz MULT ~0x70400000 16MB CSCR0 CS2Pre CS2Post CS2Wait |
| * ----------------------------------------------------------------- |
| * 11289600 1 0x00800200 4 0x0180 1 1 0 |
| * 22579200 2 0x0589e025 10 0x0180 1 1 0 |
| * 33868800 3 0x0388e025 15 0x0180 1 1 0 |
| * 45158400 4 0x0589e021 21 0x0580 1 1 0 |
| * 56448000 5 0x0289e025 26 0x0580 2 1 0 |
| * 67737600 6 0x0388e021 32 0x0980 2 1 0 |
| * 79027200 7 0x038a6021 37 0x0980 2 1 0 |
| * 90316800 8 0x038be021 43 0x0d80 2 1 0 |
| * 101606400 9 0x01892025 48 0x0d80 2 1 0 |
| * 112896000 10 0x0189e025 54 0x1180 3 1 0 |
| * 124185600 11 0x018ae025 59 0x1180 3 1 1 |
| */ |
| |
| #define MAX_REFRESH_TIMER 59 |
| #define NORMAL_REFRESH_TIMER 21 |
| #define DEFAULT_REFRESH_TIMER 4 |
| |
| #ifdef HAVE_ADJUSTABLE_CPU_FREQ |
| void set_cpu_frequency (long) __attribute__ ((section (".icode"))); |
| void set_cpu_frequency(long frequency) |
| #else |
| void cf_set_cpu_frequency (long) __attribute__ ((section (".icode"))); |
| void cf_set_cpu_frequency(long frequency) |
| #endif |
| { |
| switch(frequency) |
| { |
| case CPUFREQ_MAX: |
| DCR = (0x8200 | DEFAULT_REFRESH_TIMER); |
| /* Refresh timer for bypass frequency */ |
| PLLCR &= ~1; /* Bypass mode */ |
| timers_adjust_prescale(CPUFREQ_DEFAULT_MULT, false); |
| PLLCR = 0x018ae025 | (PLLCR & 0x70400000); |
| CSCR0 = 0x00001180; /* Flash: 4 wait states */ |
| while(!(PLLCR & 0x80000000)) {}; /* Wait until the PLL has locked. |
| This may take up to 10ms! */ |
| timers_adjust_prescale(CPUFREQ_MAX_MULT, true); |
| DCR = (0x8200 | MAX_REFRESH_TIMER); /* Refresh timer */ |
| cpu_frequency = CPUFREQ_MAX; |
| IDECONFIG1 = 0x100000 | (1 << 13) | (3 << 10); |
| /* SBUFEN2 enable | CS2Post | CS2Pre */ |
| IDECONFIG2 = 0x40000 | (1 << 8); /* TA enable + CS2wait */ |
| break; |
| |
| case CPUFREQ_NORMAL: |
| DCR = (DCR & ~0x01ff) | DEFAULT_REFRESH_TIMER; |
| /* Refresh timer for bypass frequency */ |
| PLLCR &= ~1; /* Bypass mode */ |
| timers_adjust_prescale(CPUFREQ_DEFAULT_MULT, false); |
| PLLCR = 0x0589e021 | (PLLCR & 0x70400000); |
| CSCR0 = 0x00000580; /* Flash: 1 wait state */ |
| while(!(PLLCR & 0x80000000)) {}; /* Wait until the PLL has locked. |
| This may take up to 10ms! */ |
| timers_adjust_prescale(CPUFREQ_NORMAL_MULT, true); |
| DCR = (0x8000 | NORMAL_REFRESH_TIMER); /* Refresh timer */ |
| cpu_frequency = CPUFREQ_NORMAL; |
| IDECONFIG1 = 0x100000 | (1 << 13) | (1 << 10); |
| /* BUFEN2 enable | CS2Post | CS2Pre */ |
| IDECONFIG2 = 0x40000 | (0 << 8); /* TA enable + CS2wait */ |
| break; |
| |
| default: |
| DCR = (DCR & ~0x01ff) | DEFAULT_REFRESH_TIMER; |
| /* Refresh timer for bypass frequency */ |
| PLLCR &= ~1; /* Bypass mode */ |
| timers_adjust_prescale(CPUFREQ_DEFAULT_MULT, true); |
| /* Power down PLL, but keep CRSEL and CLSEL */ |
| PLLCR = 0x00800200 | (PLLCR & 0x70400000); |
| CSCR0 = 0x00000180; /* Flash: 0 wait states */ |
| DCR = (0x8000 | DEFAULT_REFRESH_TIMER); /* Refresh timer */ |
| cpu_frequency = CPUFREQ_DEFAULT; |
| IDECONFIG1 = 0x100000 | (1 << 13) | (1 << 10); |
| /* BUFEN2 enable | CS2Post | CS2Pre */ |
| IDECONFIG2 = 0x40000 | (0 << 8); /* TA enable + CS2wait */ |
| break; |
| } |
| } |