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From 1c257eac296e162e8c445796ef1bfb3e4095d7ba Mon Sep 17 00:00:00 2001
From: Dennis Gilmore <dennis@ausil.us>
Date: Sat, 26 Apr 2014 23:35:09 -0500
Subject: [PATCH 40/40] sunxi: add hyp support on sun7i roll 2 patches sent
upstream into one
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>
sunxi: HYP/non-sec: configure CNTFRQ on all CPUs
CNTFRQ needs to be properly configured on all CPUs. Otherwise,
virtual machines hoping to find valuable information on secondary
CPUs will be disapointed...
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
arch/arm/cpu/armv7/sunxi/Makefile | 3 +
arch/arm/cpu/armv7/sunxi/psci.S | 162 ++++++++++++++++++++++++++++++++++++++
include/configs/sun7i.h | 7 ++
3 files changed, 172 insertions(+)
create mode 100644 arch/arm/cpu/armv7/sunxi/psci.S
diff --git a/arch/arm/cpu/armv7/sunxi/Makefile b/arch/arm/cpu/armv7/sunxi/Makefile
index a64bfa1..03e49ca 100644
--- a/arch/arm/cpu/armv7/sunxi/Makefile
+++ b/arch/arm/cpu/armv7/sunxi/Makefile
@@ -23,3 +23,6 @@ ifdef CONFIG_SPL_FEL
obj-y += start.o
endif
endif
+ifdef CONFIG_ARMV7_PSCI
+obj-y += psci.o
+endif
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
diff --git a/include/configs/sun7i.h b/include/configs/sun7i.h
index 9b693f7..f82431c 100644
--- a/include/configs/sun7i.h
+++ b/include/configs/sun7i.h
@@ -16,6 +16,13 @@
#define CONFIG_SYS_PROMPT "sun7i# "
+#define CONFIG_ARMV7_VIRT 1
+#define CONFIG_ARMV7_NONSEC 1
+#define CONFIG_ARMV7_PSCI 1
+#define CONFIG_ARMV7_PSCI_NR_CPUS 2
+#define CONFIG_ARMV7_SECURE_BASE SUNXI_SRAM_B_BASE
+#define CONFIG_SYS_CLK_FREQ 24000000
+
/*
* Include common sunxi configuration where most the settings are
*/
--
1.9.0
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