From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from exprod5og108.obsmtp.com ([64.18.0.186]) by merlin.infradead.org with smtps (Exim 4.76 #1 (Red Hat Linux)) id 1SV3tt-0004QJ-17 for barebox@lists.infradead.org; Thu, 17 May 2012 16:50:06 +0000 From: Renaud Barbier Date: Thu, 17 May 2012 17:49:47 +0100 Message-Id: <1337273391-20858-6-git-send-email-renaud.barbier@ge.com> In-Reply-To: <1337273391-20858-1-git-send-email-renaud.barbier@ge.com> References: <1337273391-20858-1-git-send-email-renaud.barbier@ge.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH V5 5/9] 85xx clocking support To: barebox@lists.infradead.org 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 --- arch/ppc/mach-mpc85xx/speed.c | 104 +++++++++++++++++++++++++++++++++++++++++ arch/ppc/mach-mpc85xx/time.c | 53 +++++++++++++++++++++ 2 files changed, 157 insertions(+), 0 deletions(-) create mode 100644 arch/ppc/mach-mpc85xx/speed.c create mode 100644 arch/ppc/mach-mpc85xx/time.c diff --git a/arch/ppc/mach-mpc85xx/speed.c b/arch/ppc/mach-mpc85xx/speed.c new file mode 100644 index 0000000..40d3664 --- /dev/null +++ b/arch/ppc/mach-mpc85xx/speed.c @@ -0,0 +1,104 @@ +/* + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include +#include +#include +#include +#include + +void fsl_get_sys_info(struct sys_info *sysInfo) +{ + void __iomem *gur = (void __iomem *)(MPC85xx_GUTS_ADDR); + uint plat_ratio, e500_ratio, half_freqSystemBus; + uint lcrr_div; + 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 + + 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_bus_freq(ulong dummy) +{ + struct sys_info sys_info; + + fsl_get_sys_info(&sys_info); + + return sys_info.freqSystemBus; +} + +unsigned long fsl_get_timebase_clock(void) +{ + struct sys_info sysinfo; + + fsl_get_sys_info(&sysinfo); + + return (sysinfo.freqSystemBus + 4UL)/8UL; +} diff --git a/arch/ppc/mach-mpc85xx/time.c b/arch/ppc/mach-mpc85xx/time.c new file mode 100644 index 0000000..408a28a --- /dev/null +++ b/arch/ppc/mach-mpc85xx/time.c @@ -0,0 +1,53 @@ +/* + * Copyright 2012 GE Intelligent Platforms, Inc. + * (C) Copyright 2000, 2001 + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include +#include +#include +#include + +uint64_t ppc_clocksource_read(void) +{ + return get_ticks(); +} + +static struct clocksource cs = { + .read = ppc_clocksource_read, + .mask = CLOCKSOURCE_MASK(64), +}; + +static int clocksource_init(void) +{ + /* reset time base */ + asm ("li 3,0 ; mttbu 3 ; mttbl 3 ;"); + + clocks_calc_mult_shift(&cs.mult, &cs.shift, + fsl_get_timebase_clock(), NSEC_PER_SEC, 10); + + init_clock(&cs); + + return 0; +} + +core_initcall(clocksource_init); -- 1.7.1 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox