diff options
Diffstat (limited to 'arch/powerpc/mach-mpc85xx/speed.c')
-rw-r--r-- | arch/powerpc/mach-mpc85xx/speed.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/arch/powerpc/mach-mpc85xx/speed.c b/arch/powerpc/mach-mpc85xx/speed.c new file mode 100644 index 0000000000..610949443c --- /dev/null +++ b/arch/powerpc/mach-mpc85xx/speed.c @@ -0,0 +1,143 @@ +/* + * Copyright 2012 GE Intelligent Platforms, Inc. + * + * Copyright 2004, 2007-2011 Freescale Semiconductor, Inc. + * + * (C) Copyright 2003 Motorola Inc. + * Xianghua Xiao, (X.Xiao@motorola.com) + * + * (C) Copyright 2000 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <common.h> +#include <asm/processor.h> +#include <mach/clock.h> +#include <mach/immap_85xx.h> +#include <mach/mpc85xx.h> + +void fsl_get_sys_info(struct sys_info *sysInfo) +{ + void __iomem *gur = (void __iomem *)(MPC85xx_GUTS_ADDR); + uint plat_ratio, e500_ratio, half_freqSystemBus, lcrr_div, ccr; + int i; + + plat_ratio = in_be32(gur + MPC85xx_GUTS_PORPLLSR_OFFSET) & 0x0000003e; + plat_ratio >>= 1; + sysInfo->freqSystemBus = plat_ratio * CFG_SYS_CLK_FREQ; + + /* + * Divide before multiply to avoid integer + * overflow for processor speeds above 2GHz. + */ + half_freqSystemBus = sysInfo->freqSystemBus/2; + for (i = 0; i < fsl_cpu_numcores(); i++) { + e500_ratio = (in_be32(gur + MPC85xx_GUTS_PORPLLSR_OFFSET) >> + (i * 8 + 16)) & 0x3f; + sysInfo->freqProcessor[i] = e500_ratio * half_freqSystemBus; + } + + /* Note: freqDDRBus is the MCLK frequency, not the data rate. */ + sysInfo->freqDDRBus = sysInfo->freqSystemBus; + +#ifdef CFG_DDR_CLK_FREQ + { + u32 ddr_ratio = (in_be32(gur + MPC85xx_GUTS_PORPLLSR_OFFSET) & + MPC85xx_PORPLLSR_DDR_RATIO) >> + MPC85xx_PORPLLSR_DDR_RATIO_SHIFT; + if (ddr_ratio != 0x7) + sysInfo->freqDDRBus = ddr_ratio * CFG_DDR_CLK_FREQ; + } +#endif + + if (IS_ENABLED(CONFIG_FSL_IFC)) { + void __iomem *ifc = IFC_BASE_ADDR; + + ccr = in_be32(ifc + FSL_IFC_CCR_OFFSET); + ccr = ((ccr & IFC_CCR_CLK_DIV_MASK) >> IFC_CCR_CLK_DIV_SHIFT); + sysInfo->freqLocalBus = sysInfo->freqSystemBus / (ccr + 1); + } else { + lcrr_div = in_be32(LBC_BASE_ADDR + FSL_LBC_LCCR) & LCRR_CLKDIV; + + if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) { + /* + * The entire PQ38 family use the same bit + * representation for twice the clock divider values. + */ + lcrr_div *= 2; + + sysInfo->freqLocalBus = sysInfo->freqSystemBus / lcrr_div; + } else { + /* In case anyone cares what the unknown value is */ + sysInfo->freqLocalBus = lcrr_div; + } + } +} + +unsigned long fsl_get_local_freq(void) +{ + struct sys_info sys_info; + + fsl_get_sys_info(&sys_info); + + return sys_info.freqLocalBus; +} + +unsigned long fsl_get_bus_freq(ulong dummy) +{ + struct sys_info sys_info; + + fsl_get_sys_info(&sys_info); + + return sys_info.freqSystemBus; +} + +unsigned long fsl_get_ddr_freq(ulong dummy) +{ + struct sys_info sys_info; + + fsl_get_sys_info(&sys_info); + + return sys_info.freqDDRBus; +} + +unsigned long fsl_get_timebase_clock(void) +{ + struct sys_info sysinfo; + + fsl_get_sys_info(&sysinfo); + + return (sysinfo.freqSystemBus + 4UL)/8UL; +} + +unsigned long fsl_get_i2c_freq(void) +{ + uint svr; + struct sys_info sysinfo; + void __iomem *gur = IOMEM(MPC85xx_GUTS_ADDR); + + fsl_get_sys_info(&sysinfo); + + svr = get_svr(); + if ((svr == SVR_8544) || (svr == SVR_8544_E)) { + if (in_be32(gur + MPC85xx_GUTS_PORDEVSR2_OFFSET) & + MPC85xx_PORDEVSR2_SEC_CFG) + return sysinfo.freqSystemBus / 3; + } + + return sysinfo.freqSystemBus / 2; +} |