Allwinner core changes for 4.18

The A83t, unlike the other Allwinner SoCs, cannot use PSCI because of a
 silicon bug. As such, we needed to have some smp_ops in order to bringup
 the various cores (and clusters) found on this SoC.
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Merge tag 'sunxi-core-for-4.18' of https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux into next/soc

Allwinner core changes for 4.18

The A83t, unlike the other Allwinner SoCs, cannot use PSCI because of a
silicon bug. As such, we needed to have some smp_ops in order to bringup
the various cores (and clusters) found on this SoC.

* tag 'sunxi-core-for-4.18' of https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux:
  ARM: sun8i: smp: Add support for A83T
  ARM: sun9i: smp: Add is_a83t field
  ARM: sun9i: smp: Rename clusters's power-off
  ARM: shmobile: Convert file to use cntvoff
  ARM: sunxi: Add initialization of CNTVOFF
  ARM: smp: Add initialization of CNTVOFF
  ARM: sunxi: smp: Move assembly code into a file
  ARM: Allow this header to be included by assembly files

Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/common/Makefile

@@ -10,6 +10,7 @@ obj-$(CONFIG_DMABOUNCE)		+= dmabounce.o
 obj-$(CONFIG_SHARP_LOCOMO)	+= locomo.o
 obj-$(CONFIG_SHARP_PARAM)	+= sharpsl_param.o
 obj-$(CONFIG_SHARP_SCOOP)	+= scoop.o
+obj-$(CONFIG_SMP)		+= secure_cntvoff.o
 obj-$(CONFIG_PCI_HOST_ITE8152)  += it8152.o
 obj-$(CONFIG_MCPM)		+= mcpm_head.o mcpm_entry.o mcpm_platsmp.o vlock.o
 CFLAGS_REMOVE_mcpm_entry.o	= -pg

arch/arm/common/secure_cntvoff.S

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2014 Renesas Electronics Corporation
+ *
+ * Initialization of CNTVOFF register from secure mode
+ *
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+ENTRY(secure_cntvoff_init)
+	.arch	armv7-a
+	/*
+	 * CNTVOFF has to be initialized either from non-secure Hypervisor
+	 * mode or secure Monitor mode with SCR.NS==1. If TrustZone is enabled
+	 * then it should be handled by the secure code. The CPU must implement
+	 * the virtualization extensions.
+	 */
+	cps	#MON_MODE
+	mrc	p15, 0, r1, c1, c1, 0		/* Get Secure Config */
+	orr	r0, r1, #1
+	mcr	p15, 0, r0, c1, c1, 0		/* Set Non Secure bit */
+	isb
+	mov	r0, #0
+	mcrr	p15, 4, r0, r0, c14		/* CNTVOFF = 0 */
+	isb
+	mcr	p15, 0, r1, c1, c1, 0		/* Set Secure bit */
+	isb
+	cps	#SVC_MODE
+	ret	lr
+ENDPROC(secure_cntvoff_init)

arch/arm/include/asm/secure_cntvoff.h

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASMARM_ARCH_CNTVOFF_H
+#define __ASMARM_ARCH_CNTVOFF_H
+
+extern void secure_cntvoff_init(void);
+
+#endif

arch/arm/mach-shmobile/common.h

@@ -2,7 +2,6 @@
 #ifndef __ARCH_MACH_COMMON_H
 #define __ARCH_MACH_COMMON_H
 
-extern void shmobile_init_cntvoff(void);
 extern void shmobile_init_delay(void);
 extern void shmobile_boot_vector(void);
 extern unsigned long shmobile_boot_fn;

arch/arm/mach-shmobile/headsmp-apmu.S

@@ -11,29 +11,9 @@
 #include <linux/linkage.h>
 #include <asm/assembler.h>
 
-ENTRY(shmobile_init_cntvoff)
-	/*
-	 * CNTVOFF has to be initialized either from non-secure Hypervisor
-	 * mode or secure Monitor mode with SCR.NS==1. If TrustZone is enabled
-	 * then it should be handled by the secure code
-	 */
-	cps	#MON_MODE
-	mrc	p15, 0, r1, c1, c1, 0		/* Get Secure Config */
-	orr	r0, r1, #1
-	mcr	p15, 0, r0, c1, c1, 0		/* Set Non Secure bit */
-	instr_sync
-	mov	r0, #0
-	mcrr	p15, 4, r0, r0, c14		/* CNTVOFF = 0 */
-	instr_sync
-	mcr	p15, 0, r1, c1, c1, 0		/* Set Secure bit */
-	instr_sync
-	cps	#SVC_MODE
-	ret	lr
-ENDPROC(shmobile_init_cntvoff)
-
 #ifdef CONFIG_SMP
 ENTRY(shmobile_boot_apmu)
-	bl	shmobile_init_cntvoff
+	bl	secure_cntvoff_init
 	b	secondary_startup
 ENDPROC(shmobile_boot_apmu)
 #endif

arch/arm/mach-shmobile/setup-rcar-gen2.c

@@ -26,6 +26,7 @@
 #include <linux/of_fdt.h>
 #include <linux/of_platform.h>
 #include <asm/mach/arch.h>
+#include <asm/secure_cntvoff.h>
 #include "common.h"
 #include "rcar-gen2.h"
 
@@ -70,7 +71,7 @@ void __init rcar_gen2_timer_init(void)
 	void __iomem *base;
 	u32 freq;
 
-	shmobile_init_cntvoff();
+	secure_cntvoff_init();
 
 	if (of_machine_is_compatible("renesas,r8a7745") ||
 	    of_machine_is_compatible("renesas,r8a7792") ||

arch/arm/mach-sunxi/Kconfig

@@ -51,7 +51,7 @@ config MACH_SUN9I
 config ARCH_SUNXI_MC_SMP
 	bool
 	depends on SMP
-	default MACH_SUN9I
+	default MACH_SUN9I || MACH_SUN8I
 	select ARM_CCI400_PORT_CTRL
 	select ARM_CPU_SUSPEND
 

arch/arm/mach-sunxi/Makefile

@@ -1,5 +1,5 @@
 CFLAGS_mc_smp.o	+= -march=armv7-a
 
 obj-$(CONFIG_ARCH_SUNXI) += sunxi.o
-obj-$(CONFIG_ARCH_SUNXI_MC_SMP) += mc_smp.o
+obj-$(CONFIG_ARCH_SUNXI_MC_SMP) += mc_smp.o headsmp.o
 obj-$(CONFIG_SMP) += platsmp.o

arch/arm/mach-sunxi/headsmp.S

@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (c) 2018 Chen-Yu Tsai
+ * Copyright (c) 2018 Bootlin
+ *
+ * Chen-Yu Tsai <wens@csie.org>
+ * Mylène Josserand <mylene.josserand@bootlin.com>
+ *
+ * SMP support for sunxi based systems with Cortex A7/A15
+ *
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/cputype.h>
+
+ENTRY(sunxi_mc_smp_cluster_cache_enable)
+	.arch	armv7-a
+	/*
+	 * Enable cluster-level coherency, in preparation for turning on the MMU.
+	 *
+	 * Also enable regional clock gating and L2 data latency settings for
+	 * Cortex-A15. These settings are from the vendor kernel.
+	 */
+	mrc	p15, 0, r1, c0, c0, 0
+	movw	r2, #(ARM_CPU_PART_MASK & 0xffff)
+	movt	r2, #(ARM_CPU_PART_MASK >> 16)
+	and	r1, r1, r2
+	movw	r2, #(ARM_CPU_PART_CORTEX_A15 & 0xffff)
+	movt	r2, #(ARM_CPU_PART_CORTEX_A15 >> 16)
+	cmp	r1, r2
+	bne	not_a15
+
+	/* The following is Cortex-A15 specific */
+
+	/* ACTLR2: Enable CPU regional clock gates */
+	mrc p15, 1, r1, c15, c0, 4
+	orr r1, r1, #(0x1 << 31)
+	mcr p15, 1, r1, c15, c0, 4
+
+	/* L2ACTLR */
+	mrc p15, 1, r1, c15, c0, 0
+	/* Enable L2, GIC, and Timer regional clock gates */
+	orr r1, r1, #(0x1 << 26)
+	/* Disable clean/evict from being pushed to external */
+	orr r1, r1, #(0x1<<3)
+	mcr p15, 1, r1, c15, c0, 0
+
+	/* L2CTRL: L2 data RAM latency */
+	mrc p15, 1, r1, c9, c0, 2
+	bic r1, r1, #(0x7 << 0)
+	orr r1, r1, #(0x3 << 0)
+	mcr p15, 1, r1, c9, c0, 2
+
+	/* End of Cortex-A15 specific setup */
+	not_a15:
+
+	/* Get value of sunxi_mc_smp_first_comer */
+	adr	r1, first
+	ldr	r0, [r1]
+	ldr	r0, [r1, r0]
+
+	/* Skip cci_enable_port_for_self if not first comer */
+	cmp	r0, #0
+	bxeq	lr
+	b	cci_enable_port_for_self
+
+	.align 2
+	first: .word sunxi_mc_smp_first_comer - .
+ENDPROC(sunxi_mc_smp_cluster_cache_enable)
+
+ENTRY(sunxi_mc_smp_secondary_startup)
+	bl	sunxi_mc_smp_cluster_cache_enable
+	bl	secure_cntvoff_init
+	b	secondary_startup
+ENDPROC(sunxi_mc_smp_secondary_startup)
+
+ENTRY(sunxi_mc_smp_resume)
+	bl	sunxi_mc_smp_cluster_cache_enable
+	b	cpu_resume
+ENDPROC(sunxi_mc_smp_resume)

arch/arm/mach-sunxi/mc_smp.c

@@ -55,22 +55,35 @@
 #define CPUCFG_CX_RST_CTRL_L2_RST	BIT(8)
 #define CPUCFG_CX_RST_CTRL_CX_RST(n)	BIT(4 + (n))
 #define CPUCFG_CX_RST_CTRL_CORE_RST(n)	BIT(n)
+#define CPUCFG_CX_RST_CTRL_CORE_RST_ALL	(0xf << 0)
 
 #define PRCM_CPU_PO_RST_CTRL(c)		(0x4 + 0x4 * (c))
 #define PRCM_CPU_PO_RST_CTRL_CORE(n)	BIT(n)
 #define PRCM_CPU_PO_RST_CTRL_CORE_ALL	0xf
 #define PRCM_PWROFF_GATING_REG(c)	(0x100 + 0x4 * (c))
-#define PRCM_PWROFF_GATING_REG_CLUSTER	BIT(4)
+/* The power off register for clusters are different from a80 and a83t */
+#define PRCM_PWROFF_GATING_REG_CLUSTER_SUN8I	BIT(0)
+#define PRCM_PWROFF_GATING_REG_CLUSTER_SUN9I	BIT(4)
 #define PRCM_PWROFF_GATING_REG_CORE(n)	BIT(n)
 #define PRCM_PWR_SWITCH_REG(c, cpu)	(0x140 + 0x10 * (c) + 0x4 * (cpu))
 #define PRCM_CPU_SOFT_ENTRY_REG		0x164
 
+/* R_CPUCFG registers, specific to sun8i-a83t */
+#define R_CPUCFG_CLUSTER_PO_RST_CTRL(c)	(0x30 + (c) * 0x4)
+#define R_CPUCFG_CLUSTER_PO_RST_CTRL_CORE(n)	BIT(n)
+#define R_CPUCFG_CPU_SOFT_ENTRY_REG		0x01a4
+
 #define CPU0_SUPPORT_HOTPLUG_MAGIC0	0xFA50392F
 #define CPU0_SUPPORT_HOTPLUG_MAGIC1	0x790DCA3A
 
 static void __iomem *cpucfg_base;
 static void __iomem *prcm_base;
 static void __iomem *sram_b_smp_base;
+static void __iomem *r_cpucfg_base;
+
+extern void sunxi_mc_smp_secondary_startup(void);
+extern void sunxi_mc_smp_resume(void);
+static bool is_a83t;
 
 static bool sunxi_core_is_cortex_a15(unsigned int core, unsigned int cluster)
 {
@@ -157,6 +170,16 @@ static int sunxi_cpu_powerup(unsigned int cpu, unsigned int cluster)
 	reg &= ~PRCM_CPU_PO_RST_CTRL_CORE(cpu);
 	writel(reg, prcm_base + PRCM_CPU_PO_RST_CTRL(cluster));
 
+	if (is_a83t) {
+		/* assert cpu power-on reset */
+		reg  = readl(r_cpucfg_base +
+			     R_CPUCFG_CLUSTER_PO_RST_CTRL(cluster));
+		reg &= ~(R_CPUCFG_CLUSTER_PO_RST_CTRL_CORE(cpu));
+		writel(reg, r_cpucfg_base +
+		       R_CPUCFG_CLUSTER_PO_RST_CTRL(cluster));
+		udelay(10);
+	}
+
 	/* Cortex-A7: hold L1 reset disable signal low */
 	if (!sunxi_core_is_cortex_a15(cpu, cluster)) {
 		reg = readl(cpucfg_base + CPUCFG_CX_CTRL_REG0(cluster));
@@ -180,17 +203,38 @@ static int sunxi_cpu_powerup(unsigned int cpu, unsigned int cluster)
 	/* open power switch */
 	sunxi_cpu_power_switch_set(cpu, cluster, true);
 
+	/* Handle A83T bit swap */
+	if (is_a83t) {
+		if (cpu == 0)
+			cpu = 4;
+	}
+
 	/* clear processor power gate */
 	reg = readl(prcm_base + PRCM_PWROFF_GATING_REG(cluster));
 	reg &= ~PRCM_PWROFF_GATING_REG_CORE(cpu);
 	writel(reg, prcm_base + PRCM_PWROFF_GATING_REG(cluster));
 	udelay(20);
 
+	/* Handle A83T bit swap */
+	if (is_a83t) {
+		if (cpu == 4)
+			cpu = 0;
+	}
+
 	/* de-assert processor power-on reset */
 	reg = readl(prcm_base + PRCM_CPU_PO_RST_CTRL(cluster));
 	reg |= PRCM_CPU_PO_RST_CTRL_CORE(cpu);
 	writel(reg, prcm_base + PRCM_CPU_PO_RST_CTRL(cluster));
 
+	if (is_a83t) {
+		reg  = readl(r_cpucfg_base +
+			     R_CPUCFG_CLUSTER_PO_RST_CTRL(cluster));
+		reg |= R_CPUCFG_CLUSTER_PO_RST_CTRL_CORE(cpu);
+		writel(reg, r_cpucfg_base +
+		       R_CPUCFG_CLUSTER_PO_RST_CTRL(cluster));
+		udelay(10);
+	}
+
 	/* de-assert all processor resets */
 	reg = readl(cpucfg_base + CPUCFG_CX_RST_CTRL(cluster));
 	reg |= CPUCFG_CX_RST_CTRL_DBG_RST(cpu);
@@ -212,6 +256,14 @@ static int sunxi_cluster_powerup(unsigned int cluster)
 	if (cluster >= SUNXI_NR_CLUSTERS)
 		return -EINVAL;
 
+	/* For A83T, assert cluster cores resets */
+	if (is_a83t) {
+		reg = readl(cpucfg_base + CPUCFG_CX_RST_CTRL(cluster));
+		reg &= ~CPUCFG_CX_RST_CTRL_CORE_RST_ALL;   /* Core Reset    */
+		writel(reg, cpucfg_base + CPUCFG_CX_RST_CTRL(cluster));
+		udelay(10);
+	}
+
 	/* assert ACINACTM */
 	reg = readl(cpucfg_base + CPUCFG_CX_CTRL_REG1(cluster));
 	reg |= CPUCFG_CX_CTRL_REG1_ACINACTM;
@@ -222,6 +274,16 @@ static int sunxi_cluster_powerup(unsigned int cluster)
 	reg &= ~PRCM_CPU_PO_RST_CTRL_CORE_ALL;
 	writel(reg, prcm_base + PRCM_CPU_PO_RST_CTRL(cluster));
 
+	/* assert cluster cores resets */
+	if (is_a83t) {
+		reg  = readl(r_cpucfg_base +
+			     R_CPUCFG_CLUSTER_PO_RST_CTRL(cluster));
+		reg &= ~CPUCFG_CX_RST_CTRL_CORE_RST_ALL;
+		writel(reg, r_cpucfg_base +
+		       R_CPUCFG_CLUSTER_PO_RST_CTRL(cluster));
+		udelay(10);
+	}
+
 	/* assert cluster resets */
 	reg = readl(cpucfg_base + CPUCFG_CX_RST_CTRL(cluster));
 	reg &= ~CPUCFG_CX_RST_CTRL_DBG_SOC_RST;
@@ -252,7 +314,10 @@ static int sunxi_cluster_powerup(unsigned int cluster)
 
 	/* clear cluster power gate */
 	reg = readl(prcm_base + PRCM_PWROFF_GATING_REG(cluster));
-	reg &= ~PRCM_PWROFF_GATING_REG_CLUSTER;
+	if (is_a83t)
+		reg &= ~PRCM_PWROFF_GATING_REG_CLUSTER_SUN8I;
+	else
+		reg &= ~PRCM_PWROFF_GATING_REG_CLUSTER_SUN9I;
 	writel(reg, prcm_base + PRCM_PWROFF_GATING_REG(cluster));
 	udelay(20);
 
@@ -300,74 +365,7 @@ static void sunxi_cluster_cache_disable_without_axi(void)
 }
 
 static int sunxi_mc_smp_cpu_table[SUNXI_NR_CLUSTERS][SUNXI_CPUS_PER_CLUSTER];
-static int sunxi_mc_smp_first_comer;
+int sunxi_mc_smp_first_comer;
-
-/*
- * Enable cluster-level coherency, in preparation for turning on the MMU.
- *
- * Also enable regional clock gating and L2 data latency settings for
- * Cortex-A15. These settings are from the vendor kernel.
- */
-static void __naked sunxi_mc_smp_cluster_cache_enable(void)
-{
-	asm volatile (
-		"mrc	p15, 0, r1, c0, c0, 0\n"
-		"movw	r2, #" __stringify(ARM_CPU_PART_MASK & 0xffff) "\n"
-		"movt	r2, #" __stringify(ARM_CPU_PART_MASK >> 16) "\n"
-		"and	r1, r1, r2\n"
-		"movw	r2, #" __stringify(ARM_CPU_PART_CORTEX_A15 & 0xffff) "\n"
-		"movt	r2, #" __stringify(ARM_CPU_PART_CORTEX_A15 >> 16) "\n"
-		"cmp	r1, r2\n"
-		"bne	not_a15\n"
-
-		/* The following is Cortex-A15 specific */
-
-		/* ACTLR2: Enable CPU regional clock gates */
-		"mrc p15, 1, r1, c15, c0, 4\n"
-		"orr r1, r1, #(0x1<<31)\n"
-		"mcr p15, 1, r1, c15, c0, 4\n"
-
-		/* L2ACTLR */
-		"mrc p15, 1, r1, c15, c0, 0\n"
-		/* Enable L2, GIC, and Timer regional clock gates */
-		"orr r1, r1, #(0x1<<26)\n"
-		/* Disable clean/evict from being pushed to external */
-		"orr r1, r1, #(0x1<<3)\n"
-		"mcr p15, 1, r1, c15, c0, 0\n"
-
-		/* L2CTRL: L2 data RAM latency */
-		"mrc p15, 1, r1, c9, c0, 2\n"
-		"bic r1, r1, #(0x7<<0)\n"
-		"orr r1, r1, #(0x3<<0)\n"
-		"mcr p15, 1, r1, c9, c0, 2\n"
-
-		/* End of Cortex-A15 specific setup */
-		"not_a15:\n"
-
-		/* Get value of sunxi_mc_smp_first_comer */
-		"adr	r1, first\n"
-		"ldr	r0, [r1]\n"
-		"ldr	r0, [r1, r0]\n"
-
-		/* Skip cci_enable_port_for_self if not first comer */
-		"cmp	r0, #0\n"
-		"bxeq	lr\n"
-		"b	cci_enable_port_for_self\n"
-
-		".align 2\n"
-		"first: .word sunxi_mc_smp_first_comer - .\n"
-	);
-}
-
-static void __naked sunxi_mc_smp_secondary_startup(void)
-{
-	asm volatile(
-		"bl	sunxi_mc_smp_cluster_cache_enable\n"
-		"b	secondary_startup"
-		/* Let compiler know about sunxi_mc_smp_cluster_cache_enable */
-		:: "i" (sunxi_mc_smp_cluster_cache_enable)
-	);
-}
 
 static DEFINE_SPINLOCK(boot_lock);
 
@@ -516,7 +514,10 @@ static int sunxi_cluster_powerdown(unsigned int cluster)
 	/* gate cluster power */
 	pr_debug("%s: gate cluster power\n", __func__);
 	reg = readl(prcm_base + PRCM_PWROFF_GATING_REG(cluster));
-	reg |= PRCM_PWROFF_GATING_REG_CLUSTER;
+	if (is_a83t)
+		reg |= PRCM_PWROFF_GATING_REG_CLUSTER_SUN8I;
+	else
+		reg |= PRCM_PWROFF_GATING_REG_CLUSTER_SUN9I;
 	writel(reg, prcm_base + PRCM_PWROFF_GATING_REG(cluster));
 	udelay(20);
 
@@ -598,8 +599,12 @@ out:
 	return !ret;
 }
 
-static bool sunxi_mc_smp_cpu_can_disable(unsigned int __unused)
+static bool sunxi_mc_smp_cpu_can_disable(unsigned int cpu)
 {
+	/* CPU0 hotplug not handled for sun8i-a83t */
+	if (is_a83t)
+		if (cpu == 0)
+			return false;
 	return true;
 }
 #endif
@@ -637,16 +642,6 @@ static bool __init sunxi_mc_smp_cpu_table_init(void)
  */
 typedef typeof(cpu_reset) phys_reset_t;
 
-static void __init __naked sunxi_mc_smp_resume(void)
-{
-	asm volatile(
-		"bl	sunxi_mc_smp_cluster_cache_enable\n"
-		"b	cpu_resume"
-		/* Let compiler know about sunxi_mc_smp_cluster_cache_enable */
-		:: "i" (sunxi_mc_smp_cluster_cache_enable)
-	);
-}
-
 static int __init nocache_trampoline(unsigned long __unused)
 {
 	phys_reset_t phys_reset;
@@ -692,12 +687,14 @@ struct sunxi_mc_smp_nodes {
 	struct device_node *prcm_node;
 	struct device_node *cpucfg_node;
 	struct device_node *sram_node;
+	struct device_node *r_cpucfg_node;
 };
 
 /* This structure holds SoC-specific bits tied to an enable-method string. */
 struct sunxi_mc_smp_data {
 	const char *enable_method;
 	int (*get_smp_nodes)(struct sunxi_mc_smp_nodes *nodes);
+	bool is_a83t;
 };
 
 static void __init sunxi_mc_smp_put_nodes(struct sunxi_mc_smp_nodes *nodes)
@@ -705,6 +702,7 @@ static void __init sunxi_mc_smp_put_nodes(struct sunxi_mc_smp_nodes *nodes)
 	of_node_put(nodes->prcm_node);
 	of_node_put(nodes->cpucfg_node);
 	of_node_put(nodes->sram_node);
+	of_node_put(nodes->r_cpucfg_node);
 	memset(nodes, 0, sizeof(*nodes));
 }
 
@@ -734,11 +732,42 @@ static int __init sun9i_a80_get_smp_nodes(struct sunxi_mc_smp_nodes *nodes)
 	return 0;
 }
 
+static int __init sun8i_a83t_get_smp_nodes(struct sunxi_mc_smp_nodes *nodes)
+{
+	nodes->prcm_node = of_find_compatible_node(NULL, NULL,
+						   "allwinner,sun8i-a83t-r-ccu");
+	if (!nodes->prcm_node) {
+		pr_err("%s: PRCM not available\n", __func__);
+		return -ENODEV;
+	}
+
+	nodes->cpucfg_node = of_find_compatible_node(NULL, NULL,
+						     "allwinner,sun8i-a83t-cpucfg");
+	if (!nodes->cpucfg_node) {
+		pr_err("%s: CPUCFG not available\n", __func__);
+		return -ENODEV;
+	}
+
+	nodes->r_cpucfg_node = of_find_compatible_node(NULL, NULL,
+						       "allwinner,sun8i-a83t-r-cpucfg");
+	if (!nodes->r_cpucfg_node) {
+		pr_err("%s: RCPUCFG not available\n", __func__);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
 static const struct sunxi_mc_smp_data sunxi_mc_smp_data[] __initconst = {
 	{
 		.enable_method	= "allwinner,sun9i-a80-smp",
 		.get_smp_nodes	= sun9i_a80_get_smp_nodes,
 	},
+	{
+		.enable_method	= "allwinner,sun8i-a83t-smp",
+		.get_smp_nodes	= sun8i_a83t_get_smp_nodes,
+		.is_a83t	= true,
+	},
 };
 
 static int __init sunxi_mc_smp_init(void)
@@ -746,6 +775,7 @@ static int __init sunxi_mc_smp_init(void)
 	struct sunxi_mc_smp_nodes nodes = { 0 };
 	struct device_node *node;
 	struct resource res;
+	void __iomem *addr;
 	int i, ret;
 
 	/*
@@ -771,6 +801,8 @@ static int __init sunxi_mc_smp_init(void)
 			break;
 	}
 
+	is_a83t = sunxi_mc_smp_data[i].is_a83t;
+
 	of_node_put(node);
 	if (ret)
 		return -ENODEV;
@@ -808,12 +840,23 @@ static int __init sunxi_mc_smp_init(void)
 		goto err_unmap_prcm;
 	}
 
-	sram_b_smp_base = of_io_request_and_map(nodes.sram_node, 0,
+	if (is_a83t) {
-						"sunxi-mc-smp");
+		r_cpucfg_base = of_io_request_and_map(nodes.r_cpucfg_node,
-	if (IS_ERR(sram_b_smp_base)) {
+						      0, "sunxi-mc-smp");
-		ret = PTR_ERR(sram_b_smp_base);
+		if (IS_ERR(r_cpucfg_base)) {
-		pr_err("%s: failed to map secure SRAM\n", __func__);
+			ret = PTR_ERR(r_cpucfg_base);
-		goto err_unmap_release_cpucfg;
+			pr_err("%s: failed to map R-CPUCFG registers\n",
+			       __func__);
+			goto err_unmap_release_cpucfg;
+		}
+	} else {
+		sram_b_smp_base = of_io_request_and_map(nodes.sram_node, 0,
+							"sunxi-mc-smp");
+		if (IS_ERR(sram_b_smp_base)) {
+			ret = PTR_ERR(sram_b_smp_base);
+			pr_err("%s: failed to map secure SRAM\n", __func__);
+			goto err_unmap_release_cpucfg;
+		}
 	}
 
 	/* Configure CCI-400 for boot cluster */
@@ -821,15 +864,18 @@ static int __init sunxi_mc_smp_init(void)
 	if (ret) {
 		pr_err("%s: failed to configure boot cluster: %d\n",
 		       __func__, ret);
-		goto err_unmap_release_secure_sram;
+		goto err_unmap_release_sram_rcpucfg;
 	}
 
 	/* We don't need the device nodes anymore */
 	sunxi_mc_smp_put_nodes(&nodes);
 
 	/* Set the hardware entry point address */
-	writel(__pa_symbol(sunxi_mc_smp_secondary_startup),
+	if (is_a83t)
-	       prcm_base + PRCM_CPU_SOFT_ENTRY_REG);
+		addr = r_cpucfg_base + R_CPUCFG_CPU_SOFT_ENTRY_REG;
+	else
+		addr = prcm_base + PRCM_CPU_SOFT_ENTRY_REG;
+	writel(__pa_symbol(sunxi_mc_smp_secondary_startup), addr);
 
 	/* Actually enable multi cluster SMP */
 	smp_set_ops(&sunxi_mc_smp_smp_ops);
@@ -838,9 +884,14 @@ static int __init sunxi_mc_smp_init(void)
 
 	return 0;
 
-err_unmap_release_secure_sram:
+err_unmap_release_sram_rcpucfg:
-	iounmap(sram_b_smp_base);
+	if (is_a83t) {
-	of_address_to_resource(nodes.sram_node, 0, &res);
+		iounmap(r_cpucfg_base);
+		of_address_to_resource(nodes.r_cpucfg_node, 0, &res);
+	} else {
+		iounmap(sram_b_smp_base);
+		of_address_to_resource(nodes.sram_node, 0, &res);
+	}
 	release_mem_region(res.start, resource_size(&res));
 err_unmap_release_cpucfg:
 	iounmap(cpucfg_base);

arch/arm/mach-sunxi/sunxi.c

@@ -16,6 +16,7 @@
 #include <linux/platform_device.h>
 
 #include <asm/mach/arch.h>
+#include <asm/secure_cntvoff.h>
 
 static const char * const sunxi_board_dt_compat[] = {
 	"allwinner,sun4i-a10",
@@ -62,7 +63,6 @@ MACHINE_END
 static const char * const sun8i_board_dt_compat[] = {
 	"allwinner,sun8i-a23",
 	"allwinner,sun8i-a33",
-	"allwinner,sun8i-a83t",
 	"allwinner,sun8i-h2-plus",
 	"allwinner,sun8i-h3",
 	"allwinner,sun8i-r40",
@@ -75,6 +75,24 @@ DT_MACHINE_START(SUN8I_DT, "Allwinner sun8i Family")
 	.dt_compat	= sun8i_board_dt_compat,
 MACHINE_END
 
+static void __init sun8i_a83t_cntvoff_init(void)
+{
+#ifdef CONFIG_SMP
+	secure_cntvoff_init();
+#endif
+}
+
+static const char * const sun8i_a83t_cntvoff_board_dt_compat[] = {
+	"allwinner,sun8i-a83t",
+	NULL,
+};
+
+DT_MACHINE_START(SUN8I_A83T_CNTVOFF_DT, "Allwinner A83t board")
+	.init_early	= sun8i_a83t_cntvoff_init,
+	.init_time	= sun6i_timer_init,
+	.dt_compat	= sun8i_a83t_cntvoff_board_dt_compat,
+MACHINE_END
+
 static const char * const sun9i_board_dt_compat[] = {
 	"allwinner,sun9i-a80",
 	NULL,