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https://github.com/AsahiLinux/u-boot
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c9ac3ba129
Reuse the gd->tbl value for timestamp and add gd->lastinc for lastinc bss values in the arm926ejs timers implementation. The usage of bss values in drivers before initialisation of bss is forbidden. In that special case some data in .rel.dyn gets corrupted. This patch is similiar to the patch Dirk Behme posted for the armv7/omap-common/timer.c and added suggestions from Reinhard Meyer. Tested on the arm926ejs mx27 based magnesium board Tested on the arm926ejs kirkwood based suen3 board Signed-off-by: Heiko Schocher <hs@denx.de> cc: Albert ARIBAUD <albert.aribaud@free.fr> cc: Prafulla Wadaskar <prafulla@marvell.com> cc: Stefano Babic <sbabic@denx.de> cc: Reinhard Meyer <u-boot@emk-elektronik.de>
155 lines
3.5 KiB
C
155 lines
3.5 KiB
C
/*
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* (C) Copyright 2009
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* Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
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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/io.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/spr_gpt.h>
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#include <asm/arch/spr_misc.h>
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#define GPT_RESOLUTION (CONFIG_SPEAR_HZ_CLOCK / CONFIG_SPEAR_HZ)
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#define READ_TIMER() (readl(&gpt_regs_p->count) & GPT_FREE_RUNNING)
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static struct gpt_regs *const gpt_regs_p =
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(struct gpt_regs *)CONFIG_SPEAR_TIMERBASE;
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static struct misc_regs *const misc_regs_p =
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(struct misc_regs *)CONFIG_SPEAR_MISCBASE;
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DECLARE_GLOBAL_DATA_PTR;
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#define timestamp gd->tbl
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#define lastdec gd->lastinc
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int timer_init(void)
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{
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u32 synth;
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/* Prescaler setting */
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#if defined(CONFIG_SPEAR3XX)
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writel(MISC_PRSC_CFG, &misc_regs_p->prsc2_clk_cfg);
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synth = MISC_GPT4SYNTH;
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#elif defined(CONFIG_SPEAR600)
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writel(MISC_PRSC_CFG, &misc_regs_p->prsc1_clk_cfg);
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synth = MISC_GPT3SYNTH;
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#else
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# error Incorrect config. Can only be spear{600|300|310|320}
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#endif
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writel(readl(&misc_regs_p->periph_clk_cfg) | synth,
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&misc_regs_p->periph_clk_cfg);
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/* disable timers */
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writel(GPT_PRESCALER_1 | GPT_MODE_AUTO_RELOAD, &gpt_regs_p->control);
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/* load value for free running */
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writel(GPT_FREE_RUNNING, &gpt_regs_p->compare);
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/* auto reload, start timer */
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writel(readl(&gpt_regs_p->control) | GPT_ENABLE, &gpt_regs_p->control);
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reset_timer_masked();
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return 0;
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}
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/*
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* timer without interrupts
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*/
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void reset_timer(void)
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{
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reset_timer_masked();
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}
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ulong get_timer(ulong base)
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{
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return (get_timer_masked() / GPT_RESOLUTION) - base;
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}
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void set_timer(ulong t)
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{
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timestamp = t;
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}
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void __udelay(unsigned long usec)
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{
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ulong tmo;
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ulong start = get_timer_masked();
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ulong tenudelcnt = CONFIG_SPEAR_HZ_CLOCK / (1000 * 100);
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ulong rndoff;
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rndoff = (usec % 10) ? 1 : 0;
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/* tenudelcnt timer tick gives 10 microsecconds delay */
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tmo = ((usec / 10) + rndoff) * tenudelcnt;
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while ((ulong) (get_timer_masked() - start) < tmo)
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;
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}
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void reset_timer_masked(void)
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{
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/* reset time */
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lastdec = READ_TIMER();
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timestamp = 0;
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}
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ulong get_timer_masked(void)
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{
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ulong now = READ_TIMER();
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if (now >= lastdec) {
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/* normal mode */
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timestamp += now - lastdec;
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} else {
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/* we have an overflow ... */
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timestamp += now + GPT_FREE_RUNNING - lastdec;
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}
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lastdec = now;
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return timestamp;
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}
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void udelay_masked(unsigned long usec)
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{
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return udelay(usec);
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}
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On ARM it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return get_timer(0);
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On ARM it returns the number of timer ticks per second.
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*/
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ulong get_tbclk(void)
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{
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return CONFIG_SPEAR_HZ;
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}
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