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-rw-r--r--arch/mips/cavium-octeon/smp.c211
1 files changed, 211 insertions, 0 deletions
diff --git a/arch/mips/cavium-octeon/smp.c b/arch/mips/cavium-octeon/smp.c
new file mode 100644
index 000000000000..24e0ad63980a
--- /dev/null
+++ b/arch/mips/cavium-octeon/smp.c
@@ -0,0 +1,211 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2004-2008 Cavium Networks
+ */
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/smp.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+
+#include <asm/mmu_context.h>
+#include <asm/system.h>
+#include <asm/time.h>
+
+#include <asm/octeon/octeon.h>
+
+volatile unsigned long octeon_processor_boot = 0xff;
+volatile unsigned long octeon_processor_sp;
+volatile unsigned long octeon_processor_gp;
+
+static irqreturn_t mailbox_interrupt(int irq, void *dev_id)
+{
+ const int coreid = cvmx_get_core_num();
+ uint64_t action;
+
+ /* Load the mailbox register to figure out what we're supposed to do */
+ action = cvmx_read_csr(CVMX_CIU_MBOX_CLRX(coreid));
+
+ /* Clear the mailbox to clear the interrupt */
+ cvmx_write_csr(CVMX_CIU_MBOX_CLRX(coreid), action);
+
+ if (action & SMP_CALL_FUNCTION)
+ smp_call_function_interrupt();
+
+ /* Check if we've been told to flush the icache */
+ if (action & SMP_ICACHE_FLUSH)
+ asm volatile ("synci 0($0)\n");
+ return IRQ_HANDLED;
+}
+
+/**
+ * Cause the function described by call_data to be executed on the passed
+ * cpu. When the function has finished, increment the finished field of
+ * call_data.
+ */
+void octeon_send_ipi_single(int cpu, unsigned int action)
+{
+ int coreid = cpu_logical_map(cpu);
+ /*
+ pr_info("SMP: Mailbox send cpu=%d, coreid=%d, action=%u\n", cpu,
+ coreid, action);
+ */
+ cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action);
+}
+
+static inline void octeon_send_ipi_mask(cpumask_t mask, unsigned int action)
+{
+ unsigned int i;
+
+ for_each_cpu_mask(i, mask)
+ octeon_send_ipi_single(i, action);
+}
+
+/**
+ * Detect available CPUs, populate phys_cpu_present_map
+ */
+static void octeon_smp_setup(void)
+{
+ const int coreid = cvmx_get_core_num();
+ int cpus;
+ int id;
+
+ int core_mask = octeon_get_boot_coremask();
+
+ cpus_clear(cpu_possible_map);
+ __cpu_number_map[coreid] = 0;
+ __cpu_logical_map[0] = coreid;
+ cpu_set(0, cpu_possible_map);
+
+ cpus = 1;
+ for (id = 0; id < 16; id++) {
+ if ((id != coreid) && (core_mask & (1 << id))) {
+ cpu_set(cpus, cpu_possible_map);
+ __cpu_number_map[id] = cpus;
+ __cpu_logical_map[cpus] = id;
+ cpus++;
+ }
+ }
+}
+
+/**
+ * Firmware CPU startup hook
+ *
+ */
+static void octeon_boot_secondary(int cpu, struct task_struct *idle)
+{
+ int count;
+
+ pr_info("SMP: Booting CPU%02d (CoreId %2d)...\n", cpu,
+ cpu_logical_map(cpu));
+
+ octeon_processor_sp = __KSTK_TOS(idle);
+ octeon_processor_gp = (unsigned long)(task_thread_info(idle));
+ octeon_processor_boot = cpu_logical_map(cpu);
+ mb();
+
+ count = 10000;
+ while (octeon_processor_sp && count) {
+ /* Waiting for processor to get the SP and GP */
+ udelay(1);
+ count--;
+ }
+ if (count == 0)
+ pr_err("Secondary boot timeout\n");
+}
+
+/**
+ * After we've done initial boot, this function is called to allow the
+ * board code to clean up state, if needed
+ */
+static void octeon_init_secondary(void)
+{
+ const int coreid = cvmx_get_core_num();
+ union cvmx_ciu_intx_sum0 interrupt_enable;
+
+ octeon_check_cpu_bist();
+ octeon_init_cvmcount();
+ /*
+ pr_info("SMP: CPU%d (CoreId %lu) started\n", cpu, coreid);
+ */
+ /* Enable Mailbox interrupts to this core. These are the only
+ interrupts allowed on line 3 */
+ cvmx_write_csr(CVMX_CIU_MBOX_CLRX(coreid), 0xffffffff);
+ interrupt_enable.u64 = 0;
+ interrupt_enable.s.mbox = 0x3;
+ cvmx_write_csr(CVMX_CIU_INTX_EN0((coreid * 2)), interrupt_enable.u64);
+ cvmx_write_csr(CVMX_CIU_INTX_EN0((coreid * 2 + 1)), 0);
+ cvmx_write_csr(CVMX_CIU_INTX_EN1((coreid * 2)), 0);
+ cvmx_write_csr(CVMX_CIU_INTX_EN1((coreid * 2 + 1)), 0);
+ /* Enable core interrupt processing for 2,3 and 7 */
+ set_c0_status(0x8c01);
+}
+
+/**
+ * Callout to firmware before smp_init
+ *
+ */
+void octeon_prepare_cpus(unsigned int max_cpus)
+{
+ cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffffffff);
+ if (request_irq(OCTEON_IRQ_MBOX0, mailbox_interrupt, IRQF_SHARED,
+ "mailbox0", mailbox_interrupt)) {
+ panic("Cannot request_irq(OCTEON_IRQ_MBOX0)\n");
+ }
+ if (request_irq(OCTEON_IRQ_MBOX1, mailbox_interrupt, IRQF_SHARED,
+ "mailbox1", mailbox_interrupt)) {
+ panic("Cannot request_irq(OCTEON_IRQ_MBOX1)\n");
+ }
+}
+
+/**
+ * Last chance for the board code to finish SMP initialization before
+ * the CPU is "online".
+ */
+static void octeon_smp_finish(void)
+{
+#ifdef CONFIG_CAVIUM_GDB
+ unsigned long tmp;
+ /* Pulse MCD0 signal on Ctrl-C to stop all the cores. Also set the MCD0
+ to be not masked by this core so we know the signal is received by
+ someone */
+ asm volatile ("dmfc0 %0, $22\n"
+ "ori %0, %0, 0x9100\n" "dmtc0 %0, $22\n" : "=r" (tmp));
+#endif
+
+ octeon_user_io_init();
+
+ /* to generate the first CPU timer interrupt */
+ write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ);
+}
+
+/**
+ * Hook for after all CPUs are online
+ */
+static void octeon_cpus_done(void)
+{
+#ifdef CONFIG_CAVIUM_GDB
+ unsigned long tmp;
+ /* Pulse MCD0 signal on Ctrl-C to stop all the cores. Also set the MCD0
+ to be not masked by this core so we know the signal is received by
+ someone */
+ asm volatile ("dmfc0 %0, $22\n"
+ "ori %0, %0, 0x9100\n" "dmtc0 %0, $22\n" : "=r" (tmp));
+#endif
+}
+
+struct plat_smp_ops octeon_smp_ops = {
+ .send_ipi_single = octeon_send_ipi_single,
+ .send_ipi_mask = octeon_send_ipi_mask,
+ .init_secondary = octeon_init_secondary,
+ .smp_finish = octeon_smp_finish,
+ .cpus_done = octeon_cpus_done,
+ .boot_secondary = octeon_boot_secondary,
+ .smp_setup = octeon_smp_setup,
+ .prepare_cpus = octeon_prepare_cpus,
+};