diff options
Diffstat (limited to 'arch/mips/pmc-sierra/yosemite/smp.c')
| -rw-r--r-- | arch/mips/pmc-sierra/yosemite/smp.c | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/arch/mips/pmc-sierra/yosemite/smp.c b/arch/mips/pmc-sierra/yosemite/smp.c deleted file mode 100644 index 5edab2bc6fc..00000000000 --- a/arch/mips/pmc-sierra/yosemite/smp.c +++ /dev/null @@ -1,185 +0,0 @@ -#include <linux/linkage.h> -#include <linux/sched.h> -#include <linux/smp.h> - -#include <asm/pmon.h> -#include <asm/titan_dep.h> -#include <asm/time.h> - -#define LAUNCHSTACK_SIZE 256 - -static __cpuinitdata arch_spinlock_t launch_lock = __ARCH_SPIN_LOCK_UNLOCKED; - -static unsigned long secondary_sp __cpuinitdata; -static unsigned long secondary_gp __cpuinitdata; - -static unsigned char launchstack[LAUNCHSTACK_SIZE] __initdata - __attribute__((aligned(2 * sizeof(long)))); - -static void __init prom_smp_bootstrap(void) -{ - local_irq_disable(); - - while (arch_spin_is_locked(&launch_lock)); - - __asm__ __volatile__( - " move $sp, %0 \n" - " move $gp, %1 \n" - " j smp_bootstrap \n" - : - : "r" (secondary_sp), "r" (secondary_gp)); -} - -/* - * PMON is a fragile beast. It'll blow up once the mappings it's littering - * right into the middle of KSEG3 are blown away so we have to grab the slave - * core early and keep it in a waiting loop. - */ -void __init prom_grab_secondary(void) -{ - arch_spin_lock(&launch_lock); - - pmon_cpustart(1, &prom_smp_bootstrap, - launchstack + LAUNCHSTACK_SIZE, 0); -} - -void titan_mailbox_irq(void) -{ - int cpu = smp_processor_id(); - unsigned long status; - - switch (cpu) { - case 0: - status = OCD_READ(RM9000x2_OCD_INTP0STATUS3); - OCD_WRITE(RM9000x2_OCD_INTP0CLEAR3, status); - - if (status & 0x2) - smp_call_function_interrupt(); - if (status & 0x4) - scheduler_ipi(); - break; - - case 1: - status = OCD_READ(RM9000x2_OCD_INTP1STATUS3); - OCD_WRITE(RM9000x2_OCD_INTP1CLEAR3, status); - - if (status & 0x2) - smp_call_function_interrupt(); - if (status & 0x4) - scheduler_ipi(); - break; - } -} - -/* - * Send inter-processor interrupt - */ -static void yos_send_ipi_single(int cpu, unsigned int action) -{ - /* - * Generate an INTMSG so that it can be sent over to the - * destination CPU. The INTMSG will put the STATUS bits - * based on the action desired. An alternative strategy - * is to write to the Interrupt Set register, read the - * Interrupt Status register and clear the Interrupt - * Clear register. The latter is preffered. - */ - switch (action) { - case SMP_RESCHEDULE_YOURSELF: - if (cpu == 1) - OCD_WRITE(RM9000x2_OCD_INTP1SET3, 4); - else - OCD_WRITE(RM9000x2_OCD_INTP0SET3, 4); - break; - - case SMP_CALL_FUNCTION: - if (cpu == 1) - OCD_WRITE(RM9000x2_OCD_INTP1SET3, 2); - else - OCD_WRITE(RM9000x2_OCD_INTP0SET3, 2); - break; - } -} - -static void yos_send_ipi_mask(const struct cpumask *mask, unsigned int action) -{ - unsigned int i; - - for_each_cpu(i, mask) - yos_send_ipi_single(i, action); -} - -/* - * After we've done initial boot, this function is called to allow the - * board code to clean up state, if needed - */ -static void __cpuinit yos_init_secondary(void) -{ -} - -static void __cpuinit yos_smp_finish(void) -{ - set_c0_status(ST0_CO | ST0_IM | ST0_IE); -} - -/* Hook for after all CPUs are online */ -static void yos_cpus_done(void) -{ -} - -/* - * Firmware CPU startup hook - * Complicated by PMON's weird interface which tries to minimic the UNIX fork. - * It launches the next * available CPU and copies some information on the - * stack so the first thing we do is throw away that stuff and load useful - * values into the registers ... - */ -static void __cpuinit yos_boot_secondary(int cpu, struct task_struct *idle) -{ - unsigned long gp = (unsigned long) task_thread_info(idle); - unsigned long sp = __KSTK_TOS(idle); - - secondary_sp = sp; - secondary_gp = gp; - - arch_spin_unlock(&launch_lock); -} - -/* - * Detect available CPUs, populate cpu_possible_mask before smp_init - * - * We don't want to start the secondary CPU yet nor do we have a nice probing - * feature in PMON so we just assume presence of the secondary core. - */ -static void __init yos_smp_setup(void) -{ - int i; - - init_cpu_possible(cpu_none_mask); - - for (i = 0; i < 2; i++) { - set_cpu_possible(i, true); - __cpu_number_map[i] = i; - __cpu_logical_map[i] = i; - } -} - -static void __init yos_prepare_cpus(unsigned int max_cpus) -{ - /* - * Be paranoid. Enable the IPI only if we're really about to go SMP. - */ - if (num_possible_cpus()) - set_c0_status(STATUSF_IP5); -} - -struct plat_smp_ops yos_smp_ops = { - .send_ipi_single = yos_send_ipi_single, - .send_ipi_mask = yos_send_ipi_mask, - .init_secondary = yos_init_secondary, - .smp_finish = yos_smp_finish, - .cpus_done = yos_cpus_done, - .boot_secondary = yos_boot_secondary, - .smp_setup = yos_smp_setup, - .prepare_cpus = yos_prepare_cpus, -}; |