* Santosh Shilimkar <santosh.shilim...@ti.com> [100129 03:44]:
> This patch adds L2 Cache support for OMAP4. External L2 cache
> is used in OMPA4
>
> Signed-off-by: Santosh Shilimkar <santosh.shilim...@ti.com>
> ---
> arch/arm/mach-omap2/board-4430sdp.c | 33
> ++++++++++++++++++++++++++++
> arch/arm/mm/Kconfig | 2 +-
> arch/arm/plat-omap/include/plat/omap44xx.h | 1 +
> 3 files changed, 35 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/board-4430sdp.c
> b/arch/arm/mach-omap2/board-4430sdp.c
> index 0c6be6b..194d633 100644
> --- a/arch/arm/mach-omap2/board-4430sdp.c
> +++ b/arch/arm/mach-omap2/board-4430sdp.c
> @@ -28,6 +28,7 @@
> #include <plat/control.h>
> #include <plat/timer-gp.h>
> #include <asm/hardware/gic.h>
> +#include <asm/hardware/cache-l2x0.h>
>
> static struct platform_device sdp4430_lcd_device = {
> .name = "sdp4430_lcd",
> @@ -49,6 +50,38 @@ static struct omap_lcd_config sdp4430_lcd_config
> __initdata = {
> static struct omap_board_config_kernel sdp4430_config[] __initdata = {
> { OMAP_TAG_LCD, &sdp4430_lcd_config },
> };
> +#ifdef CONFIG_CACHE_L2X0
> +static int __init omap_l2_cache_init(void)
> +{
> + void __iomem *l2cache_base;
Since this is an initcall, you need to return here early to avoid
running on other omaps:
if (!cpu_is_omap44xx())
return -ENODEV;
> +
> + /* Static mapping, never released */
> + l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K);
> + BUG_ON(!l2cache_base);
> +
> + /* Enable L2 Cache using secure api
> + * r0 contains the value to be modified and "r12" contains
> + * the monitor API number. This API uses few CPU registers
> + * internally and hence they need be backed up including
> + * link register "lr".
> + */
> + __asm__ __volatile__(
> + "stmfd r13!, {r0-r12, r14}\n"
> + "mov r0, #1\n"
> + "ldr r12, =0x102\n"
> + "dsb\n"
> + "smc\n"
> + "ldmfd r13!, {r0-r12, r14}");
> +
> + /* 32KB way size, 16-way associativity,
> + * parity disabled
> + */
> + l2x0_init(l2cache_base, 0x0e050000, 0xc0000fff);
> +
> + return 0;
> +}
> +early_initcall(omap_l2_cache_init);
> +#endif
Regards,
Tony
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