LXR uboot/arch/mips/cpu/cm

   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 * MIPS Coherence Manager (CM) Initialisation
   4 *
   5 * Copyright (c) 2016 Imagination Technologies Ltd.
   6 */
   7
   8#include <asm/addrspace.h>
   9#include <asm/asm.h>
  10#include <asm/cm.h>
  11#include <asm/mipsregs.h>
  12#include <asm/regdef.h>
  13
  14LEAF(mips_cm_map)
  15        /* Config3 must exist for a CM to be present */
  16        mfc0            t0, CP0_CONFIG, 1
  17        bgez            t0, 2f
  18        mfc0            t0, CP0_CONFIG, 2
  19        bgez            t0, 2f
  20
  21        /* Check Config3.CMGCR to determine CM presence */
  22        mfc0            t0, CP0_CONFIG, 3
  23        and             t0, t0, MIPS_CONF3_CMGCR
  24        beqz            t0, 2f
  25
  26        /* Find the current physical GCR base address */
  271:      MFC0            t0, CP0_CMGCRBASE
  28        PTR_SLL         t0, t0, 4
  29
  30        /* If the GCRs are where we want, we're done */
  31        PTR_LI          t1, CONFIG_MIPS_CM_BASE
  32        beq             t0, t1, 2f
  33
  34        /* Move the GCRs to our configured base address */
  35        PTR_LI          t2, CKSEG1
  36        PTR_ADDU        t0, t0, t2
  37        sw              zero, GCR_BASE_UPPER(t0)
  38        sw              t1, GCR_BASE(t0)
  39
  40        /* Re-check the GCR base */
  41        b               1b
  42
  432:      jr              ra
  44        END(mips_cm_map)
  45