diff options
| -rw-r--r-- | CHANGELOG | 5 | ||||
| -rw-r--r-- | Makefile | 6 | ||||
| -rwxr-xr-x | board/versatile/split_by_variant.sh | 2 | ||||
| -rw-r--r-- | cpu/arm926ejs/interrupts.c | 148 | ||||
| -rw-r--r-- | cpu/arm926ejs/omap/Makefile | 43 | ||||
| -rw-r--r-- | cpu/arm926ejs/omap/reset.S | 45 | ||||
| -rw-r--r-- | cpu/arm926ejs/omap/timer.c | 177 | ||||
| -rw-r--r-- | cpu/arm926ejs/start.S | 22 | ||||
| -rw-r--r-- | cpu/arm926ejs/versatile/Makefile | 43 | ||||
| -rw-r--r-- | cpu/arm926ejs/versatile/reset.S | 45 | ||||
| -rw-r--r-- | cpu/arm926ejs/versatile/timer.c | 175 |
11 files changed, 540 insertions, 171 deletions
@@ -2,6 +2,11 @@ Changes since U-Boot 1.1.4: ====================================================================== +* Apply SoC concept to arm926ejs CPUs, i.e. move the SoC specific + timer and cpu_reset code from cpu/$(CPU) into the new + cpu/$(CPU)/$(SOC) directories + Patch by Andreas Engel, 13 Mar 2006 + * Change max size of uncompressed uImage's to 8MByte and add CFG_BOOTM_LEN to adjust this setting. @@ -1514,7 +1514,7 @@ omap1510inn_config : unconfig @./mkconfig $(@:_config=) arm arm925t omap1510inn omap5912osk_config : unconfig - @./mkconfig $(@:_config=) arm arm926ejs omap5912osk + @./mkconfig $(@:_config=) arm arm926ejs omap5912osk NULL omap omap1610inn_config \ omap1610inn_cs0boot_config \ @@ -1534,7 +1534,7 @@ omap1610h2_cs_autoboot_config: unconfig echo "#define CONFIG_CS3_BOOT" >> ./include/config.h ; \ echo "... configured for CS3 boot"; \ fi; - @./mkconfig -a $(call xtract_omap1610xxx,$@) arm arm926ejs omap1610inn + @./mkconfig -a $(call xtract_omap1610xxx,$@) arm arm926ejs omap1610inn NULL omap omap730p2_config \ omap730p2_cs0boot_config \ @@ -1546,7 +1546,7 @@ omap730p2_cs3boot_config : unconfig echo "#define CONFIG_CS3_BOOT" >> ./include/config.h ; \ echo "... configured for CS3 boot"; \ fi; - @./mkconfig -a $(call xtract_omap730p2,$@) arm arm926ejs omap730p2 + @./mkconfig -a $(call xtract_omap730p2,$@) arm arm926ejs omap730p2 NULL omap scb9328_config : unconfig @./mkconfig $(@:_config=) arm arm920t scb9328 NULL imx diff --git a/board/versatile/split_by_variant.sh b/board/versatile/split_by_variant.sh index 35c663e..576f238 100755 --- a/board/versatile/split_by_variant.sh +++ b/board/versatile/split_by_variant.sh @@ -36,5 +36,5 @@ fi # --------------------------------------------------------- # Complete the configuration # --------------------------------------------------------- -./mkconfig -a versatile arm arm926ejs versatile +./mkconfig -a versatile arm arm926ejs versatile NULL versatile echo "Variant:: $variant" diff --git a/cpu/arm926ejs/interrupts.c b/cpu/arm926ejs/interrupts.c index 0457bff..9cac969 100644 --- a/cpu/arm926ejs/interrupts.c +++ b/cpu/arm926ejs/interrupts.c @@ -39,16 +39,6 @@ #include <arm926ejs.h> #include <asm/proc-armv/ptrace.h> -#define TIMER_LOAD_VAL 0xffffffff - -/* macro to read the 32 bit timer */ -#ifdef CONFIG_OMAP -#define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+8)) -#endif -#ifdef CONFIG_VERSATILE -#define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+4)) -#endif - #ifdef CONFIG_USE_IRQ /* enable IRQ interrupts */ void enable_interrupts (void) @@ -188,146 +178,14 @@ void do_irq (struct pt_regs *pt_regs) #else -static ulong timestamp; -static ulong lastdec; - /* nothing really to do with interrupts, just starts up a counter. */ int interrupt_init (void) { -#ifdef CONFIG_OMAP - int32_t val; - - /* Start the decrementer ticking down from 0xffffffff */ - *((int32_t *) (CFG_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL; - val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CFG_PVT << MPUTIM_PTV_BIT); - *((int32_t *) (CFG_TIMERBASE + CNTL_TIMER)) = val; -#endif /* CONFIG_OMAP */ - -#ifdef CONFIG_VERSATILE - *(volatile ulong *)(CFG_TIMERBASE + 0) = CFG_TIMER_RELOAD; /* TimerLoad */ - *(volatile ulong *)(CFG_TIMERBASE + 4) = CFG_TIMER_RELOAD; /* TimerValue */ - *(volatile ulong *)(CFG_TIMERBASE + 8) = 0x8C; -#endif /* CONFIG_VERSATILE */ - - /* init the timestamp and lastdec value */ - reset_timer_masked(); - - return (0); -} - -/* - * timer without interrupts - */ - -void reset_timer (void) -{ - reset_timer_masked (); -} + extern void timer_init(void); -ulong get_timer (ulong base) -{ - return get_timer_masked () - base; -} + timer_init(); -void set_timer (ulong t) -{ - timestamp = t; -} - -/* delay x useconds AND perserve advance timstamp value */ -void udelay (unsigned long usec) -{ - ulong tmo, tmp; - - if(usec >= 1000){ /* if "big" number, spread normalization to seconds */ - tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ - tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */ - tmo /= 1000; /* finish normalize. */ - }else{ /* else small number, don't kill it prior to HZ multiply */ - tmo = usec * CFG_HZ; - tmo /= (1000*1000); - } - - tmp = get_timer (0); /* get current timestamp */ - if( (tmo + tmp + 1) < tmp ) /* if setting this fordward will roll time stamp */ - reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastdec value */ - else - tmo += tmp; /* else, set advancing stamp wake up time */ - - while (get_timer_masked () < tmo)/* loop till event */ - /*NOP*/; -} - -void reset_timer_masked (void) -{ - /* reset time */ - lastdec = READ_TIMER; /* capure current decrementer value time */ - timestamp = 0; /* start "advancing" time stamp from 0 */ -} - -ulong get_timer_masked (void) -{ - ulong now = READ_TIMER; /* current tick value */ - - if (lastdec >= now) { /* normal mode (non roll) */ - /* normal mode */ - timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */ - } else { /* we have overflow of the count down timer */ - /* nts = ts + ld + (TLV - now) - * ts=old stamp, ld=time that passed before passing through -1 - * (TLV-now) amount of time after passing though -1 - * nts = new "advancing time stamp"...it could also roll and cause problems. - */ - timestamp += lastdec + TIMER_LOAD_VAL - now; - } - lastdec = now; - - return timestamp; -} - -/* waits specified delay value and resets timestamp */ -void udelay_masked (unsigned long usec) -{ - ulong tmo; - ulong endtime; - signed long diff; - - if (usec >= 1000) { /* if "big" number, spread normalization to seconds */ - tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ - tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */ - tmo /= 1000; /* finish normalize. */ - } else { /* else small number, don't kill it prior to HZ multiply */ - tmo = usec * CFG_HZ; - tmo /= (1000*1000); - } - - endtime = get_timer_masked () + tmo; - - do { - ulong now = get_timer_masked (); - diff = endtime - now; - } while (diff >= 0); -} - -/* - * This function is derived from PowerPC code (read timebase as long long). - * On ARM it just returns the timer value. - */ -unsigned long long get_ticks(void) -{ - return get_timer(0); -} - -/* - * This function is derived from PowerPC code (timebase clock frequency). - * On ARM it returns the number of timer ticks per second. - */ -ulong get_tbclk (void) -{ - ulong tbclk; - - tbclk = CFG_HZ; - return tbclk; + return 0; } #endif /* CONFIG_INTEGRATOR */ diff --git a/cpu/arm926ejs/omap/Makefile b/cpu/arm926ejs/omap/Makefile new file mode 100644 index 0000000..f9d3378 --- /dev/null +++ b/cpu/arm926ejs/omap/Makefile @@ -0,0 +1,43 @@ +# +# (C) Copyright 2000-2005 +# 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 $(TOPDIR)/config.mk + +LIB = lib$(SOC).a + +OBJS = timer.o +SOBJS = reset.o + +all: .depend $(LIB) + +$(LIB): $(OBJS) $(SOBJS) + $(AR) crv $@ $(OBJS) $(SOBJS) + +######################################################################### + +.depend: Makefile $(OBJS:.o=.c) + $(CC) -M $(CFLAGS) $(OBJS:.o=.c) > $@ + +sinclude .depend + +######################################################################### diff --git a/cpu/arm926ejs/omap/reset.S b/cpu/arm926ejs/omap/reset.S new file mode 100644 index 0000000..e898902 --- /dev/null +++ b/cpu/arm926ejs/omap/reset.S @@ -0,0 +1,45 @@ +/* + * armboot - Startup Code for ARM926EJS CPU-core + * + * Copyright (c) 2003 Texas Instruments + * + * ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------ + * + * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> + * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> + * Copyright (c) 2002 Gary Jennejohn <gj@denx.de> + * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com> + * Copyright (c) 2003 Kshitij <kshitij@ti.com> + * + * 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 + */ + + .align 5 +.globl reset_cpu +reset_cpu: + ldr r1, rstctl1 /* get clkm1 reset ctl */ + mov r3, #0x0 + strh r3, [r1] /* clear it */ + mov r3, #0x8 + strh r3, [r1] /* force dsp+arm reset */ +_loop_forever: + b _loop_forever + +rstctl1: + .word 0xfffece10 diff --git a/cpu/arm926ejs/omap/timer.c b/cpu/arm926ejs/omap/timer.c new file mode 100644 index 0000000..a2a9133 --- /dev/null +++ b/cpu/arm926ejs/omap/timer.c @@ -0,0 +1,177 @@ +/* + * (C) Copyright 2003 + * Texas Instruments <www.ti.com> + * + * (C) Copyright 2002 + * Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Marius Groeger <mgroeger@sysgo.de> + * + * (C) Copyright 2002 + * Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Alex Zuepke <azu@sysgo.de> + * + * (C) Copyright 2002-2004 + * Gary Jennejohn, DENX Software Engineering, <gj@denx.de> + * + * (C) Copyright 2004 + * Philippe Robin, ARM Ltd. <philippe.robin@arm.com> + * + * 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 <common.h> +#include <arm926ejs.h> + +#define TIMER_LOAD_VAL 0xffffffff + +/* macro to read the 32 bit timer */ +#define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+8)) + +static ulong timestamp; +static ulong lastdec; + +int timer_init (void) +{ + int32_t val; + + /* Start the decrementer ticking down from 0xffffffff */ + *((int32_t *) (CFG_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL; + val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CFG_PVT << MPUTIM_PTV_BIT); + *((int32_t *) (CFG_TIMERBASE + CNTL_TIMER)) = val; + + /* init the timestamp and lastdec value */ + reset_timer_masked(); + + return 0; +} + +/* + * timer without interrupts + */ + +void reset_timer (void) +{ + reset_timer_masked (); +} + +ulong get_timer (ulong base) +{ + return get_timer_masked () - base; +} + +void set_timer (ulong t) +{ + timestamp = t; +} + +/* delay x useconds AND perserve advance timstamp value */ +void udelay (unsigned long usec) +{ + ulong tmo, tmp; + + if(usec >= 1000){ /* if "big" number, spread normalization to seconds */ + tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ + tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */ + tmo /= 1000; /* finish normalize. */ + }else{ /* else small number, don't kill it prior to HZ multiply */ + tmo = usec * CFG_HZ; + tmo /= (1000*1000); + } + + tmp = get_timer (0); /* get current timestamp */ + if( (tmo + tmp + 1) < tmp ) /* if setting this fordward will roll time stamp */ + reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastdec value */ + else + tmo += tmp; /* else, set advancing stamp wake up time */ + + while (get_timer_masked () < tmo)/* loop till event */ + /*NOP*/; +} + +void reset_timer_masked (void) +{ + /* reset time */ + lastdec = READ_TIMER; /* capure current decrementer value time */ + timestamp = 0; /* start "advancing" time stamp from 0 */ +} + +ulong get_timer_masked (void) +{ + ulong now = READ_TIMER; /* current tick value */ + + if (lastdec >= now) { /* normal mode (non roll) */ + /* normal mode */ + timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */ + } else { /* we have overflow of the count down timer */ + /* nts = ts + ld + (TLV - now) + * ts=old stamp, ld=time that passed before passing through -1 + * (TLV-now) amount of time after passing though -1 + * nts = new "advancing time stamp"...it could also roll and cause problems. + */ + timestamp += lastdec + TIMER_LOAD_VAL - now; + } + lastdec = now; + + return timestamp; +} + +/* waits specified delay value and resets timestamp */ +void udelay_masked (unsigned long usec) +{ + ulong tmo; + ulong endtime; + signed long diff; + + if (usec >= 1000) { /* if "big" number, spread normalization to seconds */ + tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ + tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */ + tmo /= 1000; /* finish normalize. */ + } else { /* else small number, don't kill it prior to HZ multiply */ + tmo = usec * CFG_HZ; + tmo /= (1000*1000); + } + + endtime = get_timer_masked () + tmo; + + do { + ulong now = get_timer_masked (); + diff = endtime - now; + } while (diff >= 0); +} + +/* + * This function is derived from PowerPC code (read timebase as long long). + * On ARM it just returns the timer value. + */ +unsigned long long get_ticks(void) +{ + return get_timer(0); +} + +/* + * This function is derived from PowerPC code (timebase clock frequency). + * On ARM it returns the number of timer ticks per second. + */ +ulong get_tbclk (void) +{ + ulong tbclk; + + tbclk = CFG_HZ; + return tbclk; +} diff --git a/cpu/arm926ejs/start.S b/cpu/arm926ejs/start.S index fc6b20b..725c663 100644 --- a/cpu/arm926ejs/start.S +++ b/cpu/arm926ejs/start.S @@ -392,25 +392,3 @@ fiq: bl do_fiq #endif - -# ifdef CONFIG_INTEGRATOR - - /* Satisfied by Integrator routine (AP or CP) */ - -#else - - .align 5 -.globl reset_cpu -reset_cpu: - ldr r1, rstctl1 /* get clkm1 reset ctl */ - mov r3, #0x0 - strh r3, [r1] /* clear it */ - mov r3, #0x8 - strh r3, [r1] /* force dsp+arm reset */ -_loop_forever: - b _loop_forever - -rstctl1: - .word 0xfffece10 - -#endif /* #ifdef CONFIG_INTEGRATOR */ diff --git a/cpu/arm926ejs/versatile/Makefile b/cpu/arm926ejs/versatile/Makefile new file mode 100644 index 0000000..f9d3378 --- /dev/null +++ b/cpu/arm926ejs/versatile/Makefile @@ -0,0 +1,43 @@ +# +# (C) Copyright 2000-2005 +# 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 $(TOPDIR)/config.mk + +LIB = lib$(SOC).a + +OBJS = timer.o +SOBJS = reset.o + +all: .depend $(LIB) + +$(LIB): $(OBJS) $(SOBJS) + $(AR) crv $@ $(OBJS) $(SOBJS) + +######################################################################### + +.depend: Makefile $(OBJS:.o=.c) + $(CC) -M $(CFLAGS) $(OBJS:.o=.c) > $@ + +sinclude .depend + +######################################################################### diff --git a/cpu/arm926ejs/versatile/reset.S b/cpu/arm926ejs/versatile/reset.S new file mode 100644 index 0000000..e898902 --- /dev/null +++ b/cpu/arm926ejs/versatile/reset.S @@ -0,0 +1,45 @@ +/* + * armboot - Startup Code for ARM926EJS CPU-core + * + * Copyright (c) 2003 Texas Instruments + * + * ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------ + * + * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> + * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> + * Copyright (c) 2002 Gary Jennejohn <gj@denx.de> + * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com> + * Copyright (c) 2003 Kshitij <kshitij@ti.com> + * + * 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 + */ + + .align 5 +.globl reset_cpu +reset_cpu: + ldr r1, rstctl1 /* get clkm1 reset ctl */ + mov r3, #0x0 + strh r3, [r1] /* clear it */ + mov r3, #0x8 + strh r3, [r1] /* force dsp+arm reset */ +_loop_forever: + b _loop_forever + +rstctl1: + .word 0xfffece10 diff --git a/cpu/arm926ejs/versatile/timer.c b/cpu/arm926ejs/versatile/timer.c new file mode 100644 index 0000000..32872d2 --- /dev/null +++ b/cpu/arm926ejs/versatile/timer.c @@ -0,0 +1,175 @@ +/* + * (C) Copyright 2003 + * Texas Instruments <www.ti.com> + * + * (C) Copyright 2002 + * Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Marius Groeger <mgroeger@sysgo.de> + * + * (C) Copyright 2002 + * Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Alex Zuepke <azu@sysgo.de> + * + * (C) Copyright 2002-2004 + * Gary Jennejohn, DENX Software Engineering, <gj@denx.de> + * + * (C) Copyright 2004 + * Philippe Robin, ARM Ltd. <philippe.robin@arm.com> + * + * 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 <common.h> +#include <arm926ejs.h> + +#define TIMER_LOAD_VAL 0xffffffff + +/* macro to read the 32 bit timer */ +#define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+4)) + +static ulong timestamp; +static ulong lastdec; + +/* nothing really to do with interrupts, just starts up a counter. */ +int timer_init (void) +{ + *(volatile ulong *)(CFG_TIMERBASE + 0) = CFG_TIMER_RELOAD; /* TimerLoad */ + *(volatile ulong *)(CFG_TIMERBASE + 4) = CFG_TIMER_RELOAD; /* TimerValue */ + *(volatile ulong *)(CFG_TIMERBASE + 8) = 0x8C; + + /* init the timestamp and lastdec value */ + reset_timer_masked(); + + return 0; +} + +/* + * timer without interrupts + */ + +void reset_timer (void) +{ + reset_timer_masked (); +} + +ulong get_timer (ulong base) +{ + return get_timer_masked () - base; +} + +void set_timer (ulong t) +{ + timestamp = t; +} + +/* delay x useconds AND perserve advance timstamp value */ +void udelay (unsigned long usec) +{ + ulong tmo, tmp; + + if(usec >= 1000){ /* if "big" number, spread normalization to seconds */ + tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ + tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */ + tmo /= 1000; /* finish normalize. */ + }else{ /* else small number, don't kill it prior to HZ multiply */ + tmo = usec * CFG_HZ; + tmo /= (1000*1000); + } + + tmp = get_timer (0); /* get current timestamp */ + if( (tmo + tmp + 1) < tmp ) /* if setting this fordward will roll time stamp */ + reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastdec value */ + else + tmo += tmp; /* else, set advancing stamp wake up time */ + + while (get_timer_masked () < tmo)/* loop till event */ + /*NOP*/; +} + +void reset_timer_masked (void) +{ + /* reset time */ + lastdec = READ_TIMER; /* capure current decrementer value time */ + timestamp = 0; /* start "advancing" time stamp from 0 */ +} + +ulong get_timer_masked (void) +{ + ulong now = READ_TIMER; /* current tick value */ + + if (lastdec >= now) { /* normal mode (non roll) */ + /* normal mode */ + timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */ + } else { /* we have overflow of the count down timer */ + /* nts = ts + ld + (TLV - now) + * ts=old stamp, ld=time that passed before passing through -1 + * (TLV-now) amount of time after passing though -1 + * nts = new "advancing time stamp"...it could also roll and cause problems. + */ + timestamp += lastdec + TIMER_LOAD_VAL - now; + } + lastdec = now; + + return timestamp; +} + +/* waits specified delay value and resets timestamp */ +void udelay_masked (unsigned long usec) +{ + ulong tmo; + ulong endtime; + signed long diff; + + if (usec >= 1000) { /* if "big" number, spread normalization to seconds */ + tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ + tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */ + tmo /= 1000; /* finish normalize. */ + } else { /* else small number, don't kill it prior to HZ multiply */ + tmo = usec * CFG_HZ; + tmo /= (1000*1000); + } + + endtime = get_timer_masked () + tmo; + + do { + ulong now = get_timer_masked (); + diff = endtime - now; + } while (diff >= 0); +} + +/* + * This function is derived from PowerPC code (read timebase as long long). + * On ARM it just returns the timer value. + */ +unsigned long long get_ticks(void) +{ + return get_timer(0); +} + +/* + * This function is derived from PowerPC code (timebase clock frequency). + * On ARM it returns the number of timer ticks per second. + */ +ulong get_tbclk (void) +{ + ulong tbclk; + + tbclk = CFG_HZ; + return tbclk; +} |