LXR linux/arch/arm/mm/l2c-l2x0-resume.S

   1/*
   2 * L2C-310 early resume code.  This can be used by platforms to restore
   3 * the settings of their L2 cache controller before restoring the
   4 * processor state.
   5 *
   6 * This code can only be used to if you are running in the secure world.
   7 */
   8#include <linux/linkage.h>
   9#include <asm/assembler.h>
  10#include <asm/hardware/cache-l2x0.h>
  11
  12        .text
  13
  14ENTRY(l2c310_early_resume)
  15        adr     r0, 1f
  16        ldr     r2, [r0]
  17        add     r0, r2, r0
  18
  19        ldmia   r0, {r1, r2, r3, r4, r5, r6, r7, r8}
  20        @ r1 = phys address of L2C-310 controller
  21        @ r2 = aux_ctrl
  22        @ r3 = tag_latency
  23        @ r4 = data_latency
  24        @ r5 = filter_start
  25        @ r6 = filter_end
  26        @ r7 = prefetch_ctrl
  27        @ r8 = pwr_ctrl
  28
  29        @ Check that the address has been initialised
  30        teq     r1, #0
  31        reteq   lr
  32
  33        @ The prefetch and power control registers are revision dependent
  34        @ and can be written whether or not the L2 cache is enabled
  35        ldr     r0, [r1, #L2X0_CACHE_ID]
  36        and     r0, r0, #L2X0_CACHE_ID_RTL_MASK
  37        cmp     r0, #L310_CACHE_ID_RTL_R2P0
  38        strcs   r7, [r1, #L310_PREFETCH_CTRL]
  39        cmp     r0, #L310_CACHE_ID_RTL_R3P0
  40        strcs   r8, [r1, #L310_POWER_CTRL]
  41
  42        @ Don't setup the L2 cache if it is already enabled
  43        ldr     r0, [r1, #L2X0_CTRL]
  44        tst     r0, #L2X0_CTRL_EN
  45        retne   lr
  46
  47        str     r3, [r1, #L310_TAG_LATENCY_CTRL]
  48        str     r4, [r1, #L310_DATA_LATENCY_CTRL]
  49        str     r6, [r1, #L310_ADDR_FILTER_END]
  50        str     r5, [r1, #L310_ADDR_FILTER_START]
  51
  52        str     r2, [r1, #L2X0_AUX_CTRL]
  53        mov     r9, #L2X0_CTRL_EN
  54        str     r9, [r1, #L2X0_CTRL]
  55        ret     lr
  56ENDPROC(l2c310_early_resume)
  57
  58        .align
  591:      .long   l2x0_saved_regs - .
  60