87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
/*
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*
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* (c) 2004 Sascha Hauer <sascha@saschahauer.de>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <asm-generic/div64.h>
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#include <common.h>
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#include <command.h>
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#include <complete.h>
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#include <mach/clock.h>
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/*
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* get the system pll clock in Hz
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*
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* mfi + mfn / (mfd +1)
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* f = 2 * f_ref * --------------------
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* pd + 1
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*/
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unsigned int imx_decode_pll(unsigned int reg_val, unsigned int freq)
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{
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unsigned long long ll;
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int mfn_abs;
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unsigned int mfi, mfn, mfd, pd;
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mfi = (reg_val >> 10) & 0xf;
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mfn = reg_val & 0x3ff;
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mfd = (reg_val >> 16) & 0x3ff;
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pd = (reg_val >> 26) & 0xf;
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mfi = mfi <= 5 ? 5 : mfi;
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mfn_abs = mfn;
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#if !defined CONFIG_ARCH_MX1 && !defined CONFIG_ARCH_MX21
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if (mfn >= 0x200) {
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mfn |= 0xFFFFFE00;
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mfn_abs = -mfn;
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}
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#endif
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freq *= 2;
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freq /= pd + 1;
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ll = (unsigned long long)freq * mfn_abs;
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do_div(ll, mfd + 1);
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if (mfn < 0)
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ll = -ll;
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ll = (freq * mfi) + ll;
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return ll;
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}
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extern void imx_dump_clocks(void);
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static int do_clocks(int argc, char *argv[])
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{
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imx_dump_clocks();
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return 0;
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}
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BAREBOX_CMD_START(dump_clocks)
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.cmd = do_clocks,
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.usage = "show clock frequencies",
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BAREBOX_CMD_COMPLETE(empty_complete)
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BAREBOX_CMD_END
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