File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/arch/arm/mach-imx/platsmp.c b/arch/arm/mach-imx/platsmp.c
new file mode 100644
index 0000000..7f27001
--- /dev/null
+++ b/arch/arm/mach-imx/platsmp.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ * Copyright 2011 Linaro Ltd.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#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>
+#include <asm/mach/map.h>
+
+#include "common.h"
+#include "hardware.h"
+
+u32 g_diag_reg;
+static void __iomem *scu_base;
+
+static struct map_desc scu_io_desc __initdata = {
+ /* .virtual and .pfn are run-time assigned */
+ .length = SZ_4K,
+ .type = MT_DEVICE,
+};
+
+void __init imx_scu_map_io(void)
+{
+ unsigned long base;
+
+ /* Get SCU base */
+ asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
+
+ scu_io_desc.virtual = IMX_IO_P2V(base);
+ scu_io_desc.pfn = __phys_to_pfn(base);
+ iotable_init(&scu_io_desc, 1);
+
+ scu_base = IMX_IO_ADDRESS(base);
+}
+
+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);
+ return 0;
+}
+
+/*
+ * Initialise the CPU possible map early - this describes the CPUs
+ * which may be present or become present in the system.
+ */
+static void __init imx_smp_init_cpus(void)
+{
+ int i, ncores;
+
+ ncores = scu_get_core_count(scu_base);
+
+ for (i = ncores; i < NR_CPUS; i++)
+ set_cpu_possible(i, false);
+}
+
+void imx_smp_prepare(void)
+{
+ scu_enable(scu_base);
+}
+
+static void __init imx_smp_prepare_cpus(unsigned int max_cpus)
+{
+ imx_smp_prepare();
+
+ /*
+ * The diagnostic register holds the errata bits. Mostly bootloader
+ * does not bring up secondary cores, so that when errata bits are set
+ * in bootloader, they are set only for boot cpu. But on a SMP
+ * configuration, it should be equally done on every single core.
+ * Read the register from boot cpu here, and will replicate it into
+ * secondary cores when booting them.
+ */
+ asm("mrc p15, 0, %0, c15, c0, 1" : "=r" (g_diag_reg) : : "cc");
+ sync_cache_w(&g_diag_reg);
+}
+
+struct smp_operations imx_smp_ops __initdata = {
+ .smp_init_cpus = imx_smp_init_cpus,
+ .smp_prepare_cpus = imx_smp_prepare_cpus,
+ .smp_boot_secondary = imx_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_die = imx_cpu_die,
+ .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,
+};