[PATCH 03/11] ARM: imx: Add reset routine for i.MX28

[Shawn Guo]

2010/11/16 Uwe Kleine-König <u.kleine-koenig at pengutronix.de>:
> On Mon, Nov 15, 2010 at 10:36:27PM +0800, Shawn Guo wrote:
>> +#ifdef CONFIG_ARCH_MX28
>> +int mxc_reset_block(void __iomem *reg_addr)
>> +{
>> +     u32 reg;
>> +     int timeout;
>> +
>> +     /*
>> +      * The process of software reset of IP block is done
>> +      * in several steps:
>> +      *
>> +      * 1) clear SFTRST and wait it cleared;
>> +      * 2) clear CLKGATE, set SFTRST, wait CLKGATE set;
>> +      * 3) clear SFTRST and wait it cleared;
>> +      * 4) clear CLKGATE and wait it cleared.
>> +      */
>> +
>> +     /* Clear SFTRST */
>> +     reg = __raw_readl(reg_addr);
>> +     reg &= ~(1 << 31);
>> +     __raw_writel(reg, reg_addr);
>> +     /* Wait SFTRST cleared */
>> +     timeout = 1000;
>> +     do {
>> +             mdelay(1);
>> +             if ((__raw_readl(reg_addr) & (1 << 31)) == 0)
>> +                     break;
>> +     } while (--timeout > 0);
> Does the mdelay make sence here?
>
i.MX28 Application Processor Reference Manual, Chapter 39.5.10
"Correct Way to Software Reset a Block".

-- 
Regards,
Shawn