--- zzzz-none-000/linux-3.10.107/arch/arm/mach-imx/platsmp.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/arm/mach-imx/platsmp.c	2021-02-04 17:41:59.000000000 +0000
@@ -11,7 +11,10 @@
  */
 
 #include <linux/init.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
 #include <linux/smp.h>
+
 #include <asm/cacheflush.h>
 #include <asm/page.h>
 #include <asm/smp_scu.h>
@@ -20,8 +23,6 @@
 #include "common.h"
 #include "hardware.h"
 
-#define SCU_STANDBY_ENABLE	(1 << 5)
-
 u32 g_diag_reg;
 static void __iomem *scu_base;
 
@@ -45,15 +46,7 @@
 	scu_base = IMX_IO_ADDRESS(base);
 }
 
-void imx_scu_standby_enable(void)
-{
-	u32 val = readl_relaxed(scu_base);
-
-	val |= SCU_STANDBY_ENABLE;
-	writel_relaxed(val, scu_base);
-}
-
-static int __cpuinit imx_boot_secondary(unsigned int cpu, struct task_struct *idle)
+static int imx_boot_secondary(unsigned int cpu, struct task_struct *idle)
 {
 	imx_set_cpu_jump(cpu, v7_secondary_startup);
 	imx_enable_cpu(cpu, true);
@@ -92,8 +85,7 @@
 	 * secondary cores when booting them.
 	 */
 	asm("mrc p15, 0, %0, c15, c0, 1" : "=r" (g_diag_reg) : : "cc");
-	__cpuc_flush_dcache_area(&g_diag_reg, sizeof(g_diag_reg));
-	outer_clean_range(__pa(&g_diag_reg), __pa(&g_diag_reg + 1));
+	sync_cache_w(&g_diag_reg);
 }
 
 struct smp_operations  imx_smp_ops __initdata = {
@@ -105,3 +97,33 @@
 	.cpu_kill		= imx_cpu_kill,
 #endif
 };
+
+#define DCFG_CCSR_SCRATCHRW1	0x200
+
+static int ls1021a_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+	arch_send_wakeup_ipi_mask(cpumask_of(cpu));
+
+	return 0;
+}
+
+static void __init ls1021a_smp_prepare_cpus(unsigned int max_cpus)
+{
+	struct device_node *np;
+	void __iomem *dcfg_base;
+	unsigned long paddr;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,ls1021a-dcfg");
+	dcfg_base = of_iomap(np, 0);
+	BUG_ON(!dcfg_base);
+
+	paddr = virt_to_phys(secondary_startup);
+	writel_relaxed(cpu_to_be32(paddr), dcfg_base + DCFG_CCSR_SCRATCHRW1);
+
+	iounmap(dcfg_base);
+}
+
+struct smp_operations  ls1021a_smp_ops __initdata = {
+	.smp_prepare_cpus	= ls1021a_smp_prepare_cpus,
+	.smp_boot_secondary	= ls1021a_boot_secondary,
+};