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/*
* Copyright (C) 2013 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* Based on code by Carl van Schaik <carl@ok-labs.com>.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <asm/psci.h>
#include <asm/arch/cpu.h>
/*
* Memory layout:
*
* SECURE_RAM to text_end :
* ._secure_text section
* text_end to ALIGN_PAGE(text_end):
* nothing
* ALIGN_PAGE(text_end) to ALIGN_PAGE(text_end) + 0x1000)
* 1kB of stack per CPU (4 CPUs max).
*/
.pushsection ._secure.text, "ax"
.arch_extension sec
#define ONE_MS (CONFIG_SYS_CLK_FREQ / 1000)
#define TEN_MS (10 * ONE_MS)
.macro timer_wait reg, ticks
@ Program CNTP_TVAL
movw \reg, #(\ticks & 0xffff)
movt \reg, #(\ticks >> 16)
mcr p15, 0, \reg, c14, c2, 0
isb
@ Enable physical timer, mask interrupt
mov \reg, #3
mcr p15, 0, \reg, c14, c2, 1
@ Poll physical timer until ISTATUS is on
1: isb
mrc p15, 0, \reg, c14, c2, 1
ands \reg, \reg, #4
bne 1b
@ Disable timer
mov \reg, #0
mcr p15, 0, \reg, c14, c2, 1
isb
.endm
.globl psci_arch_init
psci_arch_init:
mrc p15, 0, r5, c1, c1, 0 @ Read SCR
bic r5, r5, #1 @ Secure mode
mcr p15, 0, r5, c1, c1, 0 @ Write SCR
isb
mrc p15, 0, r4, c0, c0, 5 @ MPIDR
and r4, r4, #3 @ cpu number in cluster
mov r5, #0x400 @ 1kB of stack per CPU
mul r4, r4, r5
adr r5, text_end @ end of text
add r5, r5, #0x2000 @ Skip two pages
lsr r5, r5, #12 @ Align to start of page
lsl r5, r5, #12
sub sp, r5, r4 @ here's our stack!
bx lr
@ r1 = target CPU
@ r2 = target PC
.globl psci_cpu_on
psci_cpu_on:
adr r0, _target_pc
str r2, [r0]
dsb
movw r0, #(SUN7I_CPUCFG_BASE & 0xffff)
movt r0, #(SUN7I_CPUCFG_BASE >> 16)
@ CPU mask
and r1, r1, #3 @ only care about first cluster
mov r4, #1
lsl r4, r4, r1
adr r6, _sunxi_cpu_entry
str r6, [r0, #0x1a4] @ PRIVATE_REG (boot vector)
@ Assert reset on target CPU
mov r6, #0
lsl r5, r1, #6 @ 64 bytes per CPU
add r5, r5, #0x40 @ Offset from base
add r5, r5, r0 @ CPU control block
str r6, [r5] @ Reset CPU
@ l1 invalidate
ldr r6, [r0, #0x184]
bic r6, r6, r4
str r6, [r0, #0x184]
@ Lock CPU
ldr r6, [r0, #0x1e4]
bic r6, r6, r4
str r6, [r0, #0x1e4]
@ Release power clamp
movw r6, #0x1ff
movt r6, #0
1: lsrs r6, r6, #1
str r6, [r0, #0x1b0]
bne 1b
timer_wait r1, TEN_MS
@ Clear power gating
ldr r6, [r0, #0x1b4]
bic r6, r6, #1
str r6, [r0, #0x1b4]
@ Deassert reset on target CPU
mov r6, #3
str r6, [r5]
@ Unlock CPU
ldr r6, [r0, #0x1e4]
orr r6, r6, r4
str r6, [r0, #0x1e4]
mov r0, #ARM_PSCI_RET_SUCCESS @ Return PSCI_RET_SUCCESS
mov pc, lr
_target_pc:
.word 0
_sunxi_cpu_entry:
@ Set SMP bit
mrc p15, 0, r0, c1, c0, 1
orr r0, r0, #0x40
mcr p15, 0, r0, c1, c0, 1
isb
bl _nonsec_init
bl psci_arch_init
adr r0, _target_pc
ldr r0, [r0]
b _do_nonsec_entry
text_end:
.popsection
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