[PATCH 1/3] OMAP4: Add L2 Cache support
From: tony@atomide.com (Tony Lindgren)
Date: 2010-01-29 17:52:04
Also in:
linux-omap
* Santosh Shilimkar [off-list ref] [100129 03:44]:
quoted hunk ↗ jump to hunk
This patch adds L2 Cache support for OMAP4. External L2 cache is used in OMPA4 Signed-off-by: Santosh Shilimkar <redacted> --- 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);
+#endifRegards, Tony