103 строки
2.4 KiB
C
103 строки
2.4 KiB
C
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/*
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* PowerQUICC II support functions
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*
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* Author: Scott Wood <scottwood@freescale.com>
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*
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* Copyright (c) 2007 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include "ops.h"
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#include "types.h"
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#include "fsl-soc.h"
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#include "pq2.h"
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#include "stdio.h"
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#include "io.h"
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#define PQ2_SCCR (0x10c80/4) /* System Clock Configuration Register */
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#define PQ2_SCMR (0x10c88/4) /* System Clock Mode Register */
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static int pq2_corecnf_map[] = {
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3, 2, 2, 2, 4, 4, 5, 9, 6, 11, 8, 10, 3, 12, 7, -1,
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6, 5, 13, 2, 14, 4, 15, 9, 0, 11, 8, 10, 16, 12, 7, -1
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};
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/* Get various clocks from crystal frequency.
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* Returns zero on failure and non-zero on success.
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*/
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int pq2_get_clocks(u32 crystal, u32 *sysfreq, u32 *corefreq,
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u32 *timebase, u32 *brgfreq)
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{
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u32 *immr;
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u32 sccr, scmr, mainclk, busclk;
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int corecnf, busdf, plldf, pllmf, dfbrg;
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immr = fsl_get_immr();
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if (!immr) {
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printf("pq2_get_clocks: Couldn't get IMMR base.\r\n");
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return 0;
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}
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sccr = in_be32(&immr[PQ2_SCCR]);
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scmr = in_be32(&immr[PQ2_SCMR]);
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dfbrg = sccr & 3;
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corecnf = (scmr >> 24) & 0x1f;
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busdf = (scmr >> 20) & 0xf;
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plldf = (scmr >> 12) & 1;
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pllmf = scmr & 0xfff;
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mainclk = crystal * (pllmf + 1) / (plldf + 1);
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busclk = mainclk / (busdf + 1);
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if (sysfreq)
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*sysfreq = mainclk / 2;
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if (timebase)
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*timebase = busclk / 4;
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if (brgfreq)
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*brgfreq = mainclk / (1 << ((dfbrg + 1) * 2));
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if (corefreq) {
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int coremult = pq2_corecnf_map[corecnf];
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if (coremult < 0)
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*corefreq = mainclk / 2;
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else if (coremult == 0)
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return 0;
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else
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*corefreq = busclk * coremult / 2;
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}
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return 1;
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}
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/* Set common device tree fields based on the given clock frequencies. */
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void pq2_set_clocks(u32 sysfreq, u32 corefreq, u32 timebase, u32 brgfreq)
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{
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void *node;
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dt_fixup_cpu_clocks(corefreq, timebase, sysfreq);
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node = finddevice("/soc/cpm");
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if (node)
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setprop(node, "clock-frequency", &sysfreq, 4);
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node = finddevice("/soc/cpm/brg");
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if (node)
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setprop(node, "clock-frequency", &brgfreq, 4);
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}
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int pq2_fixup_clocks(u32 crystal)
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{
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u32 sysfreq, corefreq, timebase, brgfreq;
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if (!pq2_get_clocks(crystal, &sysfreq, &corefreq, &timebase, &brgfreq))
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return 0;
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pq2_set_clocks(sysfreq, corefreq, timebase, brgfreq);
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return 1;
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}
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