[U-Boot] [PATCH] arm925t: Fix CONFIG_SYS_HZ to 1000
Dirk Behme
dirk.behme at googlemail.com
Mon Apr 20 19:38:21 CEST 2009
Dear Ladis,
Ladislav Michl wrote:
> Let CONFIG_SYS_HZ to have value of 1000 effectively fixing all users of
> get_timer.
In the other mail you mentioned OMAP1, which would include the ARM926
based devices (e.g. OSK), too. Any special reason why in here you deal
only with the 925 based ones? The ARM926 based OMAP1s seem to have the
same issue?
Or do you already prepare a 926 patch, too, and I'm just too fast with
asking? ;)
Best regards
Dirk
> Signed-off-by: Ladislav Michl <ladis at linux-mips.org>
>
> diff --git a/cpu/arm925t/interrupts.c b/cpu/arm925t/interrupts.c
> index e5c77f7..a22be66 100644
> --- a/cpu/arm925t/interrupts.c
> +++ b/cpu/arm925t/interrupts.c
> @@ -1,4 +1,7 @@
> /*
> + * (C) Copyright 2009
> + * 2N Telekomunikace, <www.2n.cz>
> + *
> * (C) Copyright 2003
> * Texas Instruments, <www.ti.com>
> *
> @@ -37,7 +40,8 @@
> #include <configs/omap1510.h>
> #include <asm/io.h>
>
> -#define TIMER_LOAD_VAL 0xffffffff
> +#define TIMER_LOAD_VAL 0xffffffff
> +#define TIMER_CLOCK (CONFIG_SYS_CLK_FREQ / (2 << CONFIG_SYS_PTV))
>
> static uint32_t timestamp;
> static uint32_t lastdec;
> @@ -76,88 +80,44 @@ void set_timer (ulong t)
> timestamp = t;
> }
>
> -/* delay x useconds AND preserve advance timestamp value */
> +/* delay usec microseconds preserving timestamp 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 *= CONFIG_SYS_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 * CONFIG_SYS_HZ;
> - tmo /= (1000*1000);
> + int32_t tmo = usec * (TIMER_CLOCK / 1000) / 1000;
> + uint32_t now, last = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM);
> +
> + while (tmo > 0) {
> + now = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM);
> + if (last < now) /* count down timer underflow */
> + tmo -= TIMER_LOAD_VAL - now + last;
> + else
> + tmo -= last - now;
> + last = now;
> }
> -
> - 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 = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM);
> + lastdec = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM) /
> + (TIMER_CLOCK / CONFIG_SYS_HZ);
> timestamp = 0; /* start "advancing" time stamp from 0 */
> }
>
> ulong get_timer_masked (void)
> {
> - uint32_t now = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM);
> -
> - 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;
> - }
> + uint32_t now = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM) /
> + (TIMER_CLOCK / CONFIG_SYS_HZ);
> + if (lastdec < now) /* count down timer underflow */
> + timestamp += TIMER_LOAD_VAL / (TIMER_CLOCK / CONFIG_SYS_HZ) -
> + now + lastdec;
> + else
> + timestamp += lastdec - now;
> lastdec = now;
>
> return timestamp;
> }
>
> -/* waits specified delay value and resets timestamp */
> -void udelay_masked (unsigned long usec)
> -{
> -#ifdef CONFIG_INNOVATOROMAP1510
> - #define LOOPS_PER_MSEC 60 /* tuned on omap1510 */
> - volatile int i, time_remaining = LOOPS_PER_MSEC*usec;
> - for (i=time_remaining; i>0; i--) { }
> -#else
> -
> - 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 *= CONFIG_SYS_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 * CONFIG_SYS_HZ;
> - tmo /= (1000*1000);
> - }
> -
> - endtime = get_timer_masked () + tmo;
> -
> - do {
> - ulong now = get_timer_masked ();
> - diff = endtime - now;
> - } while (diff >= 0);
> -#endif
> -}
> -
> /*
> * This function is derived from PowerPC code (read timebase as long long).
> * On ARM it just returns the timer value.
> diff --git a/include/configs/SX1.h b/include/configs/SX1.h
> index caa6592..9313c7b 100644
> --- a/include/configs/SX1.h
> +++ b/include/configs/SX1.h
> @@ -135,12 +135,12 @@
>
> #define CONFIG_SYS_LOAD_ADDR 0x10000000 /* default load address */
>
> -/* The 1510 has 3 timers, they can be driven by the RefClk (12Mhz) or by DPLL1.
> +/* The 1510 has 3 timers, they can be driven by the RefClk (12MHz) or by DPLL1.
> * This time is further subdivided by a local divisor.
> */
> #define CONFIG_SYS_TIMERBASE OMAP1510_TIMER1_BASE /* use timer 1 */
> #define CONFIG_SYS_PTV 7 /* 2^(PTV+1), divide by 256 */
> -#define CONFIG_SYS_HZ ((CONFIG_SYS_CLK_FREQ)/(2 << CONFIG_SYS_PTV))
> +#define CONFIG_SYS_HZ 1000
>
> /*-----------------------------------------------------------------------
> * Stack sizes
> diff --git a/include/configs/netstar.h b/include/configs/netstar.h
> index 39560de..5cfee66 100644
> --- a/include/configs/netstar.h
> +++ b/include/configs/netstar.h
> @@ -222,12 +222,12 @@
>
> #define CONFIG_SYS_LOAD_ADDR PHYS_SDRAM_1 + 0x400000 /* default load address */
>
> -/* The 1510 has 3 timers, they can be driven by the RefClk (12Mhz) or by DPLL1.
> +/* The 1510 has 3 timers, they can be driven by the RefClk (12MHz) or by DPLL1.
> * This time is further subdivided by a local divisor.
> */
> #define CONFIG_SYS_TIMERBASE OMAP1510_TIMER1_BASE
> -#define CONFIG_SYS_PTV 7 /* 2^(pvt+1), divide by 256 */
> -#define CONFIG_SYS_HZ ((CONFIG_SYS_CLK_FREQ)/(2 << CONFIG_SYS_PTV))
> +#define CONFIG_SYS_PTV 7
> +#define CONFIG_SYS_HZ 1000
>
> #define OMAP5910_DPLL_DIV 1
> #define OMAP5910_DPLL_MUL ((CONFIG_SYS_CLK_FREQ * \
> diff --git a/include/configs/omap1510inn.h b/include/configs/omap1510inn.h
> index 6c1c5ec..def85c1 100644
> --- a/include/configs/omap1510inn.h
> +++ b/include/configs/omap1510inn.h
> @@ -132,12 +132,12 @@
>
> #define CONFIG_SYS_LOAD_ADDR 0x10000000 /* default load address */
>
> -/* The 1510 has 3 timers, they can be driven by the RefClk (12Mhz) or by DPLL1.
> +/* The 1510 has 3 timers, they can be driven by the RefClk (12MHz) or by DPLL1.
> * This time is further subdivided by a local divisor.
> */
> #define CONFIG_SYS_TIMERBASE OMAP1510_TIMER1_BASE /* use timer 1 */
> #define CONFIG_SYS_PTV 7 /* 2^(PTV+1), divide by 256 */
> -#define CONFIG_SYS_HZ ((CONFIG_SYS_CLK_FREQ)/(2 << CONFIG_SYS_PTV))
> +#define CONFIG_SYS_HZ 1000
>
> /*-----------------------------------------------------------------------
> * Stack sizes
> diff --git a/include/configs/voiceblue.h b/include/configs/voiceblue.h
> index 3f97843..aa8efaa 100644
> --- a/include/configs/voiceblue.h
> +++ b/include/configs/voiceblue.h
> @@ -210,12 +210,12 @@
> #define CONFIG_SYS_MEMTEST_START PHYS_SDRAM_1
> #define CONFIG_SYS_MEMTEST_END PHYS_SDRAM_1 + PHYS_SDRAM_1_SIZE - PHYS_SDRAM_1_RESERVED
>
> -/* The 1510 has 3 timers, they can be driven by the RefClk (12Mhz) or by DPLL1.
> +/* The 1510 has 3 timers, they can be driven by the RefClk (12MHz) or by DPLL1.
> * This time is further subdivided by a local divisor.
> */
> #define CONFIG_SYS_TIMERBASE OMAP1510_TIMER1_BASE
> #define CONFIG_SYS_PTV 7 /* 2^(PTV+1), divide by 256 */
> -#define CONFIG_SYS_HZ ((CONFIG_SYS_CLK_FREQ)/(2 << CONFIG_SYS_PTV))
> +#define CONFIG_SYS_HZ 1000
>
> #define OMAP5910_DPLL_DIV 1
> #define OMAP5910_DPLL_MUL ((CONFIG_SYS_CLK_FREQ * \
>
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