--- /dev/null
+/*
+ * Copyright (C) 2015 - Chen-Yu Tsai
+ * Author: Chen-Yu Tsai <wens@csie.org>
+ *
+ * Based on psci_sun7i.S by Marc Zyngier <marc.zyngier@arm.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/gic.h>
+#include <asm/macro.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_TIMER_CLK_FREQ / 1000)
+#define TEN_MS (10 * ONE_MS)
+#define GICD_BASE 0x1c81000
+#define GICC_BASE 0x1c82000
+
+.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_fiq_enter
+psci_fiq_enter:
+ push {r0-r12}
+
+ @ Switch to secure
+ mrc p15, 0, r7, c1, c1, 0
+ bic r8, r7, #1
+ mcr p15, 0, r8, c1, c1, 0
+ isb
+
+ @ Validate reason based on IAR and acknowledge
+ movw r8, #(GICC_BASE & 0xffff)
+ movt r8, #(GICC_BASE >> 16)
+ ldr r9, [r8, #GICC_IAR]
+ movw r10, #0x3ff
+ movt r10, #0
+ cmp r9, r10 @ skip spurious interrupt 1023
+ beq out
+ movw r10, #0x3fe @ ...and 1022
+ cmp r9, r10
+ beq out
+ str r9, [r8, #GICC_EOIR] @ acknowledge the interrupt
+ dsb
+
+ @ Compute CPU number
+ lsr r9, r9, #10
+ and r9, r9, #0xf
+
+ movw r8, #(SUN6I_CPUCFG_BASE & 0xffff)
+ movt r8, #(SUN6I_CPUCFG_BASE >> 16)
+
+ @ Wait for the core to enter WFI
+ lsl r11, r9, #6 @ x64
+ add r11, r11, r8
+
+1: ldr r10, [r11, #0x48]
+ tst r10, #(1 << 2)
+ bne 2f
+ timer_wait r10, ONE_MS
+ b 1b
+
+ @ Reset CPU
+2: mov r10, #0
+ str r10, [r11, #0x40]
+
+ @ Lock CPU
+ mov r10, #1
+ lsl r11, r10, r9 @ r11 is now CPU mask
+ ldr r10, [r8, #0x1e4]
+ bic r10, r10, r11
+ str r10, [r8, #0x1e4]
+
+ movw r8, #(SUNXI_PRCM_BASE & 0xffff)
+ movt r8, #(SUNXI_PRCM_BASE >> 16)
+
+ @ Set power gating
+ ldr r10, [r8, #0x100]
+ orr r10, r10, r11
+ str r10, [r8, #0x100]
+ timer_wait r10, ONE_MS
+
+ @ Activate power clamp
+ lsl r12, r9, #2 @ x4
+ add r12, r12, r8
+ mov r10, #0xff
+ str r10, [r12, #0x140]
+
+ movw r8, #(SUN6I_CPUCFG_BASE & 0xffff)
+ movt r8, #(SUN6I_CPUCFG_BASE >> 16)
+
+ @ Unlock CPU
+ ldr r10, [r8, #0x1e4]
+ orr r10, r10, r11
+ str r10, [r8, #0x1e4]
+
+ @ Restore security level
+out: mcr p15, 0, r7, c1, c1, 0
+
+ pop {r0-r12}
+ subs pc, lr, #4
+
+ @ r1 = target CPU
+ @ r2 = target PC
+.globl psci_cpu_on
+psci_cpu_on:
+ push {lr}
+
+ mov r0, r1
+ bl psci_get_cpu_stack_top @ get stack top of target CPU
+ str r2, [r0] @ store target PC at stack top
+ dsb
+
+ movw r0, #(SUN6I_CPUCFG_BASE & 0xffff)
+ movt r0, #(SUN6I_CPUCFG_BASE >> 16)
+
+ @ CPU mask
+ and r1, r1, #3 @ only care about first cluster
+ mov r4, #1
+ lsl r4, r4, r1
+
+ ldr r6, =psci_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] @ CPUCFG_GEN_CTRL_REG
+ bic r6, r6, r4
+ str r6, [r0, #0x184]
+
+ @ Lock CPU (Disable external debug access)
+ ldr r6, [r0, #0x1e4] @ CPUCFG_DBG_CTL1_REG
+ bic r6, r6, r4
+ str r6, [r0, #0x1e4]
+
+ movw r0, #(SUNXI_PRCM_BASE & 0xffff)
+ movt r0, #(SUNXI_PRCM_BASE >> 16)
+
+ @ Release power clamp
+ lsl r5, r1, #2 @ 1 register per CPU
+ add r5, r5, r0 @ PRCM
+ movw r6, #0x1ff
+ movt r6, #0
+1: lsrs r6, r6, #1
+ str r6, [r5, #0x140] @ CPUx_PWR_CLAMP
+ bne 1b
+
+ timer_wait r6, TEN_MS
+
+ @ Clear power gating
+ ldr r6, [r0, #0x100] @ CPU_PWROFF_GATING
+ bic r6, r6, r4
+ str r6, [r0, #0x100]
+
+ @ re-calculate CPU control register address
+ movw r0, #(SUN6I_CPUCFG_BASE & 0xffff)
+ movt r0, #(SUN6I_CPUCFG_BASE >> 16)
+
+ @ Deassert reset on target CPU
+ mov r6, #3
+ 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]
+
+ @ Unlock CPU (Enable external debug access)
+ ldr r6, [r0, #0x1e4] @ CPUCFG_DBG_CTL1_REG
+ orr r6, r6, r4
+ str r6, [r0, #0x1e4]
+
+ mov r0, #ARM_PSCI_RET_SUCCESS @ Return PSCI_RET_SUCCESS
+ pop {pc}
+
+.globl psci_cpu_off
+psci_cpu_off:
+ bl psci_cpu_off_common
+
+ @ Ask CPU0 to pull the rug...
+ movw r0, #(GICD_BASE & 0xffff)
+ movt r0, #(GICD_BASE >> 16)
+ movw r1, #15 @ SGI15
+ movt r1, #1 @ Target is CPU0
+ str r1, [r0, #GICD_SGIR]
+ dsb
+
+1: wfi
+ b 1b
+
+.globl psci_arch_init
+psci_arch_init:
+ mov r6, lr
+
+ movw r4, #(GICD_BASE & 0xffff)
+ movt r4, #(GICD_BASE >> 16)
+
+ ldr r5, [r4, #GICD_IGROUPRn]
+ bic r5, r5, #(1 << 15) @ SGI15 as Group-0
+ str r5, [r4, #GICD_IGROUPRn]
+
+ mov r5, #0 @ Set SGI15 priority to 0
+ strb r5, [r4, #(GICD_IPRIORITYRn + 15)]
+
+ add r4, r4, #0x1000 @ GICC address
+
+ mov r5, #0xff
+ str r5, [r4, #GICC_PMR] @ Be cool with non-secure
+
+ ldr r5, [r4, #GICC_CTLR]
+ orr r5, r5, #(1 << 3) @ Switch FIQEn on
+ str r5, [r4, #GICC_CTLR]
+
+ mrc p15, 0, r5, c1, c1, 0 @ Read SCR
+ orr r5, r5, #4 @ Enable FIQ in monitor mode
+ bic r5, r5, #1 @ Secure mode
+ mcr p15, 0, r5, c1, c1, 0 @ Write SCR
+ isb
+
+ bl psci_get_cpu_id @ CPU ID => r0
+ bl psci_get_cpu_stack_top @ stack top => r0
+ mov sp, r0
+
+ bx r6
+
+ .globl psci_text_end
+psci_text_end:
+ .popsection
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