/* $NetBSD: sunxi_mc_mpstart.S,v 1.2 2019/02/06 13:15:59 skrll Exp $ */

/*-
 * Copyright (c) 2018 Jared McNeill <jmcneill@invisible.ca>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>

#include <arm/asm.h>
#include <arm/armreg.h>
#include "assym.h"

#define CCI_SNOOP_CTRL          0x000
#define  CCI_SNOOP_CTRL_DVM     __BIT(1)
#define  CCI_SNOOP_CTRL_SNOOP   __BIT(0)

        R_TMP1          .req r8
        R_VTOPDIFF      .req r10

        .global _C_LABEL(sunxi_mc_mpstart)
_C_LABEL(sunxi_mc_mpstart):

        adr     R_TMP1, sunxi_mc_mpstart
        ldr     R_VTOPDIFF, =sunxi_mc_mpstart
        sub     R_VTOPDIFF, R_VTOPDIFF, R_TMP1

        mrc     p15, 0, r4, c0, c0, 5           // MPIDR get
        and     r4, #(MPIDR_AFF2|MPIDR_AFF1|MPIDR_AFF0)

        mov     r0, #0
        ldr     r1, =cpu_mpidr
        sub     r1, R_VTOPDIFF
1:

        ldr     r2, [r1, r0, lsl #2]            // r2 = cpu_mpidr[r0]
        cmp     r2, r4
        beq     2f                              // found our mpidr

        add     r0, #1
        cmp     r0, #MAXCPUS
        bne     1b

        // Not found our mpidr in the list - use Aff0 for cpuindex
        and     r0, r4, #7
2:

        // Find our CCI-400 interface's base address by cpuindex
        ldr     r1, =sunxi_mc_cci_port
        sub     r1, R_VTOPDIFF
        ldr     r2, [r1, r0, lsl #2]            // r2 = sunxi_mc_cci_port[r0]

        cmp     r2, #0
        beq     3f

        // Enable snooping and DVM broadcast on our CCI-400 interface
        mov     r3, #(CCI_SNOOP_CTRL_DVM|CCI_SNOOP_CTRL_SNOOP)
        str     r3, [r2, #CCI_SNOOP_CTRL]

3:
        b cpu_mpstart