#define EMEV2_SCU_BASE 0x1e000000
- static void __cpuinit emev2_secondary_init(unsigned int cpu)
-static DEFINE_SPINLOCK(scu_lock);
-static void __iomem *scu_base;
-
-static void modify_scu_cpu_psr(unsigned long set, unsigned long clr)
--{
- gic_secondary_init(0);
- unsigned long tmp;
-
- /* we assume this code is running on a different cpu
- * than the one that is changing coherency setting */
- spin_lock(&scu_lock);
- tmp = readl(scu_base + 8);
- tmp &= ~clr;
- tmp |= set;
- writel(tmp, scu_base + 8);
- spin_unlock(&scu_lock);
-
-}
-
-static unsigned int __init emev2_get_core_count(void)
-{
- if (!scu_base) {
- scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE);
- emev2_clock_init(); /* need ioremapped SMU */
- }
-
- WARN_ON_ONCE(!scu_base);
-
- return scu_base ? scu_get_core_count(scu_base) : 1;
-}
-
-static int emev2_platform_cpu_kill(unsigned int cpu)
-{
- return 0; /* not supported yet */
-}
-
-static int __maybe_unused emev2_cpu_kill(unsigned int cpu)
-{
- int k;
-
- /* this function is running on another CPU than the offline target,
- * here we need wait for shutdown code in platform_cpu_die() to
- * finish before asking SoC-specific code to power off the CPU core.
- */
- for (k = 0; k < 1000; k++) {
- if (shmobile_cpu_is_dead(cpu))
- return emev2_platform_cpu_kill(cpu);
- mdelay(1);
- }
-
- return 0;
--}
-
--
static int __cpuinit emev2_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
- cpu = cpu_logical_map(cpu);
-
- /* enable cache coherency */
- modify_scu_cpu_psr(0, 3 << (cpu * 8));
-
- /* Tell ROM loader about our vector (in headsmp.S) */
- emev2_set_boot_vector(__pa(shmobile_secondary_vector));
-
- arch_send_wakeup_ipi_mask(cpumask_of(cpu));
+ arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu)));
return 0;
}
struct smp_operations emev2_smp_ops __initdata = {
.smp_init_cpus = emev2_smp_init_cpus,
.smp_prepare_cpus = emev2_smp_prepare_cpus,
- .smp_secondary_init = emev2_secondary_init,
.smp_boot_secondary = emev2_boot_secondary,
-#ifdef CONFIG_HOTPLUG_CPU
- .cpu_kill = emev2_cpu_kill,
- .cpu_die = shmobile_cpu_die,
- .cpu_disable = shmobile_cpu_disable,
-#endif
};
--- /dev/null
- /* Secondary CPU kernel startup is a 2 step process. The primary CPU
- * starts the secondary CPU by giving it the address of the kernel and
- * then sending it an event to wake it up. The secondary CPU then
- * starts the kernel and tells the primary CPU it's up and running.
- */
- static void __cpuinit zynq_secondary_init(unsigned int cpu)
- {
- /*
- * if any interrupts are already enabled for the primary
- * core (e.g. timer irq), then they will not have been enabled
- * for us: do so
- */
- gic_secondary_init(0);
- }
-
+/*
+ * This file contains Xilinx specific SMP code, used to start up
+ * the second processor.
+ *
+ * Copyright (C) 2011-2013 Xilinx
+ *
+ * based on linux/arch/arm/mach-realview/platsmp.c
+ *
+ * Copyright (C) 2002 ARM Ltd.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#include <linux/export.h>
+#include <linux/jiffies.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <asm/cacheflush.h>
+#include <asm/smp_scu.h>
+#include <linux/irqchip/arm-gic.h>
+#include "common.h"
+
+/*
+ * Store number of cores in the system
+ * Because of scu_get_core_count() must be in __init section and can't
+ * be called from zynq_cpun_start() because it is in __cpuinit section.
+ */
+static int ncores;
+
- .smp_secondary_init = zynq_secondary_init,
+int __cpuinit zynq_cpun_start(u32 address, int cpu)
+{
+ u32 trampoline_code_size = &zynq_secondary_trampoline_end -
+ &zynq_secondary_trampoline;
+
+ if (cpu > ncores) {
+ pr_warn("CPU No. is not available in the system\n");
+ return -1;
+ }
+
+ /* MS: Expectation that SLCR are directly map and accessible */
+ /* Not possible to jump to non aligned address */
+ if (!(address & 3) && (!address || (address >= trampoline_code_size))) {
+ /* Store pointer to ioremap area which points to address 0x0 */
+ static u8 __iomem *zero;
+ u32 trampoline_size = &zynq_secondary_trampoline_jump -
+ &zynq_secondary_trampoline;
+
+ zynq_slcr_cpu_stop(cpu);
+
+ if (__pa(PAGE_OFFSET)) {
+ zero = ioremap(0, trampoline_code_size);
+ if (!zero) {
+ pr_warn("BOOTUP jump vectors not accessible\n");
+ return -1;
+ }
+ } else {
+ zero = (__force u8 __iomem *)PAGE_OFFSET;
+ }
+
+ /*
+ * This is elegant way how to jump to any address
+ * 0x0: Load address at 0x8 to r0
+ * 0x4: Jump by mov instruction
+ * 0x8: Jumping address
+ */
+ memcpy((__force void *)zero, &zynq_secondary_trampoline,
+ trampoline_size);
+ writel(address, zero + trampoline_size);
+
+ flush_cache_all();
+ outer_flush_range(0, trampoline_code_size);
+ smp_wmb();
+
+ if (__pa(PAGE_OFFSET))
+ iounmap(zero);
+
+ zynq_slcr_cpu_start(cpu);
+
+ return 0;
+ }
+
+ pr_warn("Can't start CPU%d: Wrong starting address %x\n", cpu, address);
+
+ return -1;
+}
+EXPORT_SYMBOL(zynq_cpun_start);
+
+static int __cpuinit zynq_boot_secondary(unsigned int cpu,
+ struct task_struct *idle)
+{
+ return zynq_cpun_start(virt_to_phys(secondary_startup), cpu);
+}
+
+/*
+ * Initialise the CPU possible map early - this describes the CPUs
+ * which may be present or become present in the system.
+ */
+static void __init zynq_smp_init_cpus(void)
+{
+ int i;
+
+ ncores = scu_get_core_count(zynq_scu_base);
+
+ for (i = 0; i < ncores && i < CONFIG_NR_CPUS; i++)
+ set_cpu_possible(i, true);
+}
+
+static void __init zynq_smp_prepare_cpus(unsigned int max_cpus)
+{
+ int i;
+
+ /*
+ * Initialise the present map, which describes the set of CPUs
+ * actually populated at the present time.
+ */
+ for (i = 0; i < max_cpus; i++)
+ set_cpu_present(i, true);
+
+ scu_enable(zynq_scu_base);
+}
+
+struct smp_operations zynq_smp_ops __initdata = {
+ .smp_init_cpus = zynq_smp_init_cpus,
+ .smp_prepare_cpus = zynq_smp_prepare_cpus,
+ .smp_boot_secondary = zynq_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_die = zynq_platform_cpu_die,
+#endif
+};
projects / platform / kernel / linux-arm64.git / commitdiff