From mboxrd@z Thu Jan  1 00:00:00 1970
From: seedshope <bocui107@gmail.com>
Date: Tue, 04 Jan 2011 22:56:24 +0800
Subject: [U-Boot] [PATCH] S3C64XX: timer: replace bss variable by gd
In-Reply-To: <4D2332BF.4080607@gmail.com>
References: <4D22D6F7.3050609@samsung.com> <4D2332BF.4080607@gmail.com>
Message-ID: <4D233518.6070407@gmail.com>
List-Id: <u-boot.lists.denx.de>
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To: u-boot@lists.denx.de

On 01/04/2011 10:46 PM, seedshope wrote:
> On 01/04/2011 04:14 PM, Minkyu Kang wrote:
>> Use the global data instead of bss variable, replace as follow.
>> timer_load_val ->  timer_rate_hz
>> timestamp ->  timer_reset_value
>> lastdec ->  lastinc
> I have already test the patch on s3c6410 . It is work perfect.
Before I am not use the patch, When I use the command "nand read",
The some information will generate. as following:
raise: Signal # 8 caught

I also trace the timer.c, But I can't resolve it. As if after the first 
initial timer,
I guess the bss will be clear.

Now It is ok after patch this patch.

Thanks,
seedshope
>
> Thanks,
> seedshope
>> Signed-off-by: Minkyu Kang<mk7.kang@samsung.com>
>> Signed-off-by: Darius Augulis<augulis.darius@gmail.com>
>> cc: Heiko Schocher<hs@denx.de>
>> ---
>>   arch/arm/cpu/arm1176/s3c64xx/timer.c |   40 
>> +++++++++++++--------------------
>>   1 files changed, 16 insertions(+), 24 deletions(-)
>>
>> diff --git a/arch/arm/cpu/arm1176/s3c64xx/timer.c 
>> b/arch/arm/cpu/arm1176/s3c64xx/timer.c
>> index 9768319..c1280f2 100644
>> --- a/arch/arm/cpu/arm1176/s3c64xx/timer.c
>> +++ b/arch/arm/cpu/arm1176/s3c64xx/timer.c
>> @@ -43,7 +43,7 @@
>>   #include<asm/arch/s3c6400.h>
>>   #include<div64.h>
>>
>> -static ulong timer_load_val;
>> +DECLARE_GLOBAL_DATA_PTR;
>>
>>   #define PRESCALER    167
>>
>> @@ -60,12 +60,6 @@ static inline ulong read_timer(void)
>>       return timers->TCNTO4;
>>   }
>>
>> -/* Internal tick units */
>> -/* Last decremneter snapshot */
>> -static unsigned long lastdec;
>> -/* Monotonic incrementing timer */
>> -static unsigned long long timestamp;
>> -
>>   int timer_init(void)
>>   {
>>       s3c64xx_timers *const timers = s3c64xx_get_base_timers();
>> @@ -83,20 +77,18 @@ int timer_init(void)
>>        * the prescaler automatically for other PCLK frequencies.
>>        */
>>       timers->TCFG0 = PRESCALER<<  8;
>> -    if (timer_load_val == 0) {
>> -        timer_load_val = get_PCLK() / PRESCALER * (100 / 4); /* 100s */
>> -        timers->TCFG1 = (timers->TCFG1&  ~0xf0000) | 0x20000;
>> -    }
>> +    gd->timer_rate_hz = get_PCLK() / PRESCALER * (100 / 4); /* 100s */
>> +    timers->TCFG1 = (timers->TCFG1&  ~0xf0000) | 0x20000;
>>
>>       /* load value for 10 ms timeout */
>> -    lastdec = timers->TCNTB4 = timer_load_val;
>> +    gd->lastinc = timers->TCNTB4 = gd->timer_rate_hz;
>>       /* auto load, manual update of Timer 4 */
>>       timers->TCON = (timers->TCON&  ~0x00700000) | TCON_4_AUTO |
>>           TCON_4_UPDATE;
>>
>>       /* auto load, start Timer 4 */
>>       timers->TCON = (timers->TCON&  ~0x00700000) | TCON_4_AUTO | 
>> COUNT_4_ON;
>> -    timestamp = 0;
>> +    gd->timer_reset_value = 0;
>>
>>       return 0;
>>   }
>> @@ -113,16 +105,16 @@ unsigned long long get_ticks(void)
>>   {
>>       ulong now = read_timer();
>>
>> -    if (lastdec>= now) {
>> +    if (gd->lastinc>= now) {
>>           /* normal mode */
>> -        timestamp += lastdec - now;
>> +        gd->timer_reset_value += gd->lastinc - now;
>>       } else {
>>           /* we have an overflow ... */
>> -        timestamp += lastdec + timer_load_val - now;
>> +        gd->timer_reset_value += gd->lastinc + gd->timer_rate_hz - now;
>>       }
>> -    lastdec = now;
>> +    gd->lastinc = now;
>>
>> -    return timestamp;
>> +    return gd->timer_reset_value;
>>   }
>>
>>   /*
>> @@ -132,14 +124,14 @@ unsigned long long get_ticks(void)
>>   ulong get_tbclk(void)
>>   {
>>       /* We overrun in 100s */
>> -    return (ulong)(timer_load_val / 100);
>> +    return (ulong)(gd->timer_rate_hz / 100);
>>   }
>>
>>   void reset_timer_masked(void)
>>   {
>>       /* reset time */
>> -    lastdec = read_timer();
>> -    timestamp = 0;
>> +    gd->lastinc = read_timer();
>> +    gd->timer_reset_value = 0;
>>   }
>>
>>   void reset_timer(void)
>> @@ -150,7 +142,7 @@ void reset_timer(void)
>>   ulong get_timer_masked(void)
>>   {
>>       unsigned long long res = get_ticks();
>> -    do_div (res, (timer_load_val / (100 * CONFIG_SYS_HZ)));
>> +    do_div(res, (gd->timer_rate_hz / (100 * CONFIG_SYS_HZ)));
>>       return res;
>>   }
>>
>> @@ -161,7 +153,7 @@ ulong get_timer(ulong base)
>>
>>   void set_timer(ulong t)
>>   {
>> -    timestamp = t * (timer_load_val / (100 * CONFIG_SYS_HZ));
>> +    gd->timer_reset_value = t * (gd->timer_rate_hz / (100 * 
>> CONFIG_SYS_HZ));
>>   }
>>
>>   void __udelay(unsigned long usec)
>> @@ -170,7 +162,7 @@ void __udelay(unsigned long usec)
>>       ulong tmo;
>>
>>       tmo = (usec + 9) / 10;
>> -    tmp = get_ticks() + tmo;    /* get current timestamp */
>> +    tmp = get_ticks() + tmo;    /* get current timer_reset_value */
>>
>>       while (get_ticks()<  tmp)/* loop till event */
>>            /*NOP*/;
>