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authorSantosh Shilimkar <santosh.shilimkar@ti.com>2010-02-04 19:37:09 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-02-15 22:39:55 +0100
commitd309427e792ea750cdd312e7a92cf6047ae44962 (patch)
treefa179001f1c54db7800ba8b0faf0b3a6fff54f2b /arch/arm
parentARM: 5916/1: ARM: L2 : Add maintainace by line helper functions (diff)
downloadlinux-d309427e792ea750cdd312e7a92cf6047ae44962.tar.xz
linux-d309427e792ea750cdd312e7a92cf6047ae44962.zip
ARM: 5917/1: OMAP4: Add L2 Cache support
This patch adds L2 Cache support for OMAP4. External L2 cache is used in OMAP4 CC: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-omap2/board-4430sdp.c54
-rw-r--r--arch/arm/mm/Kconfig2
-rw-r--r--arch/arm/plat-omap/include/plat/omap44xx.h1
3 files changed, 56 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/board-4430sdp.c b/arch/arm/mach-omap2/board-4430sdp.c
index 0c6be6b4a7e2..8ba8fb5b2514 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",
@@ -50,6 +51,59 @@ static struct omap_board_config_kernel sdp4430_config[] __initdata = {
{ OMAP_TAG_LCD, &sdp4430_lcd_config },
};
+#ifdef CONFIG_CACHE_L2X0
+noinline void omap_smc1(u32 fn, u32 arg)
+{
+ register u32 r12 asm("r12") = fn;
+ register u32 r0 asm("r0") = arg;
+
+ /* This is common routine cache secure monitor API used to
+ * modify the PL310 secure registers.
+ * r0 contains the value to be modified and "r12" contains
+ * the monitor API number. It uses few CPU registers
+ * internally and hence they need be backed up including
+ * link register "lr".
+ * Explicitly save r11 and r12 the compiler generated code
+ * won't save it.
+ */
+ asm volatile(
+ "stmfd r13!, {r11,r12}\n"
+ "dsb\n"
+ "smc\n"
+ "ldmfd r13!, {r11,r12}\n"
+ : "+r" (r0), "+r" (r12)
+ :
+ : "r4", "r5", "r10", "lr", "cc");
+}
+EXPORT_SYMBOL(omap_smc1);
+
+static int __init omap_l2_cache_init(void)
+{
+ void __iomem *l2cache_base;
+
+ /* To avoid code running on other OMAPs in
+ * multi-omap builds
+ */
+ if (!cpu_is_omap44xx())
+ return -ENODEV;
+
+ /* Static mapping, never released */
+ l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K);
+ BUG_ON(!l2cache_base);
+
+ /* Enable PL310 L2 Cache controller */
+ omap_smc1(0x102, 0x1);
+
+ /* 32KB way size, 16-way associativity,
+ * parity disabled
+ */
+ l2x0_init(l2cache_base, 0x0e050000, 0xc0000fff);
+
+ return 0;
+}
+early_initcall(omap_l2_cache_init);
+#endif
+
static void __init gic_init_irq(void)
{
void __iomem *base;
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 4c2e90dc549c..e859743024a0 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -754,7 +754,7 @@ config CACHE_FEROCEON_L2_WRITETHROUGH
config CACHE_L2X0
bool "Enable the L2x0 outer cache controller"
depends on REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || MACH_REALVIEW_PB1176 || \
- REALVIEW_EB_A9MP || ARCH_MX35 || ARCH_MX31 || MACH_REALVIEW_PBX || ARCH_NOMADIK
+ REALVIEW_EB_A9MP || ARCH_MX35 || ARCH_MX31 || MACH_REALVIEW_PBX || ARCH_NOMADIK || ARCH_OMAP4
default y
select OUTER_CACHE
help
diff --git a/arch/arm/plat-omap/include/plat/omap44xx.h b/arch/arm/plat-omap/include/plat/omap44xx.h
index ef870de43c29..c7d628ecb467 100644
--- a/arch/arm/plat-omap/include/plat/omap44xx.h
+++ b/arch/arm/plat-omap/include/plat/omap44xx.h
@@ -40,6 +40,7 @@
#define OMAP44XX_GIC_CPU_BASE 0x48240100
#define OMAP44XX_SCU_BASE 0x48240000
#define OMAP44XX_LOCAL_TWD_BASE 0x48240600
+#define OMAP44XX_L2CACHE_BASE 0x48242000
#define OMAP44XX_WKUPGEN_BASE 0x48281000
#define OMAP44XX_MAILBOX_BASE (L4_44XX_BASE + 0xF4000)