sunxi: HYP/non-sec: add sun7i PSCI backend

So far, only supporting the CPU_ON method.
Other functions can be added later.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

2 files changed, 165 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/sunxi/Makefile b/arch/arm/cpu/armv7/sunxi/Makefile
index 6c70639..e9721b2 100644
--- a/arch/arm/cpu/armv7/sunxi/Makefile
+++ b/arch/arm/cpu/armv7/sunxi/Makefile
@@ -17,6 +17,9 @@ obj-$(CONFIG_SUN7I)	+= clock_sun4i.o
 
 ifndef CONFIG_SPL_BUILD
 obj-y	+= cpu_info.o
+ifdef CONFIG_ARMV7_PSCI
+obj-y	+= psci.o
+endif
 endif
 
 ifdef CONFIG_SPL_BUILD
diff --git a/arch/arm/cpu/armv7/sunxi/psci.S b/arch/arm/cpu/armv7/sunxi/psci.S
new file mode 100644
index 0000000..0084c81
--- /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