diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mm/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/mm/l2c-l2x0-resume.S | 58 |
2 files changed, 59 insertions, 1 deletions
diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile index de5a6a27081..91da64de440 100644 --- a/arch/arm/mm/Makefile +++ b/arch/arm/mm/Makefile @@ -97,6 +97,6 @@ AFLAGS_proc-v7.o :=-Wa,-march=armv7-a obj-$(CONFIG_OUTER_CACHE) += l2c-common.o obj-$(CONFIG_CACHE_FEROCEON_L2) += cache-feroceon-l2.o -obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o +obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o l2c-l2x0-resume.o obj-$(CONFIG_CACHE_XSC3L2) += cache-xsc3l2.o obj-$(CONFIG_CACHE_TAUROS2) += cache-tauros2.o diff --git a/arch/arm/mm/l2c-l2x0-resume.S b/arch/arm/mm/l2c-l2x0-resume.S new file mode 100644 index 00000000000..99b05f21a59 --- /dev/null +++ b/arch/arm/mm/l2c-l2x0-resume.S @@ -0,0 +1,58 @@ +/* + * L2C-310 early resume code. This can be used by platforms to restore + * the settings of their L2 cache controller before restoring the + * processor state. + * + * This code can only be used to if you are running in the secure world. + */ +#include <linux/linkage.h> +#include <asm/hardware/cache-l2x0.h> + + .text + +ENTRY(l2c310_early_resume) + adr r0, 1f + ldr r2, [r0] + add r0, r2, r0 + + ldmia r0, {r1, r2, r3, r4, r5, r6, r7, r8} + @ r1 = phys address of L2C-310 controller + @ r2 = aux_ctrl + @ r3 = tag_latency + @ r4 = data_latency + @ r5 = filter_start + @ r6 = filter_end + @ r7 = prefetch_ctrl + @ r8 = pwr_ctrl + + @ Check that the address has been initialised + teq r1, #0 + moveq pc, lr + + @ The prefetch and power control registers are revision dependent + @ and can be written whether or not the L2 cache is enabled + ldr r0, [r1, #L2X0_CACHE_ID] + and r0, r0, #L2X0_CACHE_ID_RTL_MASK + cmp r0, #L310_CACHE_ID_RTL_R2P0 + strcs r7, [r1, #L310_PREFETCH_CTRL] + cmp r0, #L310_CACHE_ID_RTL_R3P0 + strcs r8, [r1, #L310_POWER_CTRL] + + @ Don't setup the L2 cache if it is already enabled + ldr r0, [r1, #L2X0_CTRL] + tst r0, #L2X0_CTRL_EN + movne pc, lr + + str r3, [r1, #L310_TAG_LATENCY_CTRL] + str r4, [r1, #L310_DATA_LATENCY_CTRL] + str r6, [r1, #L310_ADDR_FILTER_END] + str r5, [r1, #L310_ADDR_FILTER_START] + + str r2, [r1, #L2X0_AUX_CTRL] + mov r9, #L2X0_CTRL_EN + str r9, [r1, #L2X0_CTRL] + mov pc, lr +ENDPROC(l2c310_early_resume) + + .align +1: .long l2x0_saved_regs - . |