[PATCH 1/4] ARM: cache-l2x0: Manage the errata at run time

[Srinidhi Kasagar]

On Mon, Jan 21, 2013 at 17:08:34 +0100, Russell King - ARM Linux wrote:
> On Mon, Jan 21, 2013 at 06:44:53PM +0530, srinidhi kasagar wrote:
> > +/*
> > + * Identify ther RTL releases of l2x0 - This might help in applying
> > + * the l2x0 errata's dynamically rather compile time options
> > + */
> > +asmlinkage u32 l2x0_get_rtl_release(void)
> 
> Why asmlinkage?

Because I found that TI's omap suspend code also need this.
arch/arm/mach-omap2/sleep44xx.S

> 
> > +{
> > +	return readl_relaxed(l2x0_base + L2X0_CACHE_ID) &
> > +			L2X0_CACHE_ID_RTL_MASK;
> > +}
> > +
> >  static inline void cache_wait_way(void __iomem *reg, unsigned long mask)
> >  {
> >  	/* wait for cache operation by line or way to complete */
> > @@ -87,46 +97,41 @@ static inline void l2x0_inv_line(unsigned long addr)
> >  	writel_relaxed(addr, base + L2X0_INV_LINE_PA);
> >  }
> >  
> > -#if defined(CONFIG_PL310_ERRATA_588369) || defined(CONFIG_PL310_ERRATA_727915)
> > -static inline void debug_writel(unsigned long val)
> > +static void debug_writel(unsigned long val)
> >  {
> > -	if (outer_cache.set_debug)
> > -		outer_cache.set_debug(val);
> > +	u32 l2x0_revision = l2x0_get_rtl_release();
> > +
> > +	if (l2x0_revision == L2X0_CACHE_ID_RTL_R3P0 ||
> > +		l2x0_revision == L2X0_CACHE_ID_RTL_R2P0 ||
> > +		l2x0_revision == L2X0_CACHE_ID_RTL_R1P0 ||
> > +		l2x0_revision == L2X0_CACHE_ID_RTL_R0P0)
> > +			if (outer_cache.set_debug)
> > +				outer_cache.set_debug(val);
> 
> This needs comments from the TI folk.  Also, change this around - if
> there's no setting for 'set_debug' there's no point reading the rtl
> release and checking it against a set of values.  Added Santosh.
> 
> >  static inline void l2x0_flush_line(unsigned long addr)
> >  {
> >  	void __iomem *base = l2x0_base;
> > -	cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
> > -	writel_relaxed(addr, base + L2X0_CLEAN_INV_LINE_PA);
> > +	u32 l2x0_revision = l2x0_get_rtl_release();
> > +
> > +	if (l2x0_revision == L2X0_CACHE_ID_RTL_R0P0 ||
> > +		l2x0_revision == L2X0_CACHE_ID_RTL_R1P0)
> > +	{
> 
> Coding standards.

OK.

regards/srinidhi