85xx clocking support
This patch contains functions that returns information on the CPU and buses frequency (LBC, DDR, system). It also includes the clock source driver. Signed-off-by: Renaud Barbier <renaud.barbier@ge.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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/*
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* Copyright 2012 GE Intelligent Platforms, Inc.
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*
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* Copyright 2004, 2007-2011 Freescale Semiconductor, Inc.
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*
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* (C) Copyright 2003 Motorola Inc.
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* Xianghua Xiao, (X.Xiao@motorola.com)
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*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.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 <common.h>
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#include <asm/processor.h>
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#include <mach/clocks.h>
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#include <mach/immap_85xx.h>
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#include <mach/mpc85xx.h>
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void fsl_get_sys_info(struct sys_info *sysInfo)
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{
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void __iomem *gur = (void __iomem *)(MPC85xx_GUTS_ADDR);
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uint plat_ratio, e500_ratio, half_freqSystemBus;
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uint lcrr_div;
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int i;
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plat_ratio = in_be32(gur + MPC85xx_GUTS_PORPLLSR_OFFSET) & 0x0000003e;
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plat_ratio >>= 1;
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sysInfo->freqSystemBus = plat_ratio * CFG_SYS_CLK_FREQ;
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/*
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* Divide before multiply to avoid integer
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* overflow for processor speeds above 2GHz.
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*/
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half_freqSystemBus = sysInfo->freqSystemBus/2;
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for (i = 0; i < fsl_cpu_numcores(); i++) {
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e500_ratio = (in_be32(gur + MPC85xx_GUTS_PORPLLSR_OFFSET) >>
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(i * 8 + 16)) & 0x3f;
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sysInfo->freqProcessor[i] = e500_ratio * half_freqSystemBus;
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}
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/* Note: freqDDRBus is the MCLK frequency, not the data rate. */
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sysInfo->freqDDRBus = sysInfo->freqSystemBus;
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#ifdef CFG_DDR_CLK_FREQ
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{
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u32 ddr_ratio = (in_be32(gur + MPC85xx_GUTS_PORPLLSR_OFFSET) &
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MPC85xx_PORPLLSR_DDR_RATIO) >>
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MPC85xx_PORPLLSR_DDR_RATIO_SHIFT;
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if (ddr_ratio != 0x7)
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sysInfo->freqDDRBus = ddr_ratio * CFG_DDR_CLK_FREQ;
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}
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#endif
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lcrr_div = in_be32(LBC_BASE_ADDR + FSL_LBC_LCCR) & LCRR_CLKDIV;
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if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) {
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/*
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* The entire PQ38 family use the same bit-representation
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* for twice the clock divider values.
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*/
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lcrr_div *= 2;
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sysInfo->freqLocalBus = sysInfo->freqSystemBus / lcrr_div;
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} else {
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/* In case anyone cares what the unknown value is */
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sysInfo->freqLocalBus = lcrr_div;
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}
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}
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unsigned long fsl_get_bus_freq(ulong dummy)
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{
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struct sys_info sys_info;
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fsl_get_sys_info(&sys_info);
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return sys_info.freqSystemBus;
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}
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unsigned long fsl_get_timebase_clock(void)
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{
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struct sys_info sysinfo;
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fsl_get_sys_info(&sysinfo);
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return (sysinfo.freqSystemBus + 4UL)/8UL;
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}
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@ -0,0 +1,53 @@
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/*
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* Copyright 2012 GE Intelligent Platforms, Inc.
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* (C) Copyright 2000, 2001
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* Wolfgang Denk, DENX Software Engineering, wd@denx.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 <common.h>
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#include <clock.h>
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#include <init.h>
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#include <mach/clocks.h>
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uint64_t ppc_clocksource_read(void)
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{
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return get_ticks();
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}
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static struct clocksource cs = {
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.read = ppc_clocksource_read,
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.mask = CLOCKSOURCE_MASK(64),
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};
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static int clocksource_init(void)
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{
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/* reset time base */
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asm ("li 3,0 ; mttbu 3 ; mttbl 3 ;");
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clocks_calc_mult_shift(&cs.mult, &cs.shift,
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fsl_get_timebase_clock(), NSEC_PER_SEC, 10);
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init_clock(&cs);
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return 0;
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}
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core_initcall(clocksource_init);
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