diff options
Diffstat (limited to 'arch/arm/cpu/armv7/sunxi/psci.S')
| -rw-r--r-- | arch/arm/cpu/armv7/sunxi/psci.S | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/sunxi/psci.S b/arch/arm/cpu/armv7/sunxi/psci.S new file mode 100644 index 0000000000..0084c811f3 --- /dev/null +++ b/arch/arm/cpu/armv7/sunxi/psci.S @@ -0,0 +1,162 @@ +/* + * 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, #400 @ 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, #(SUNXI_CPUCFG_BASE & 0xffff) + movt r0, #(SUNXI_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 |