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ARM: 5845/1: l2x0: check whether l2x0 already enabled

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If running in non-secure mode accessing
some registers of l2x0 will fault. So
check if l2x0 is already enabled, if so
do not access those secure registers.

Signed-off-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Srinidhi Kasagar 2009-12-02 06:18:03 +01:00 committed by Russell King
parent 1f739d7643
commit 48371cd3f4
1 changed files with 16 additions and 9 deletions
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25
arch/arm/mm/cache-l2x0.c
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@ -99,18 +99,25 @@ void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
l2x0_base = base;
/* disable L2X0 */
writel(0, l2x0_base + L2X0_CTRL);
/*
* Check if l2x0 controller is already enabled.
* If you are booting from non-secure mode
* accessing the below registers will fault.
*/
if (!(readl(l2x0_base + L2X0_CTRL) & 1)) {
aux = readl(l2x0_base + L2X0_AUX_CTRL);
aux &= aux_mask;
aux |= aux_val;
writel(aux, l2x0_base + L2X0_AUX_CTRL);
/* l2x0 controller is disabled */
l2x0_inv_all();
aux = readl(l2x0_base + L2X0_AUX_CTRL);
aux &= aux_mask;
aux |= aux_val;
writel(aux, l2x0_base + L2X0_AUX_CTRL);
/* enable L2X0 */
writel(1, l2x0_base + L2X0_CTRL);
l2x0_inv_all();
/* enable L2X0 */
writel(1, l2x0_base + L2X0_CTRL);
}
outer_cache.inv_range = l2x0_inv_range;
outer_cache.clean_range = l2x0_clean_range;