diff options
Diffstat (limited to 'arch/powerpc/platforms/85xx/smp.c')
| -rw-r--r-- | arch/powerpc/platforms/85xx/smp.c | 220 |
1 files changed, 183 insertions, 37 deletions
diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c index ff4249044a3c..6fcfa12e5c56 100644 --- a/arch/powerpc/platforms/85xx/smp.c +++ b/arch/powerpc/platforms/85xx/smp.c @@ -2,7 +2,7 @@ * Author: Andy Fleming <afleming@freescale.com> * Kumar Gala <galak@kernel.crashing.org> * - * Copyright 2006-2008, 2011 Freescale Semiconductor Inc. + * Copyright 2006-2008, 2011-2012 Freescale Semiconductor Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the @@ -17,6 +17,7 @@ #include <linux/of.h> #include <linux/kexec.h> #include <linux/highmem.h> +#include <linux/cpu.h> #include <asm/machdep.h> #include <asm/pgtable.h> @@ -24,33 +25,118 @@ #include <asm/mpic.h> #include <asm/cacheflush.h> #include <asm/dbell.h> +#include <asm/fsl_guts.h> #include <sysdev/fsl_soc.h> #include <sysdev/mpic.h> #include "smp.h" -extern void __early_start(void); - -#define BOOT_ENTRY_ADDR_UPPER 0 -#define BOOT_ENTRY_ADDR_LOWER 1 -#define BOOT_ENTRY_R3_UPPER 2 -#define BOOT_ENTRY_R3_LOWER 3 -#define BOOT_ENTRY_RESV 4 -#define BOOT_ENTRY_PIR 5 -#define BOOT_ENTRY_R6_UPPER 6 -#define BOOT_ENTRY_R6_LOWER 7 -#define NUM_BOOT_ENTRY 8 -#define SIZE_BOOT_ENTRY (NUM_BOOT_ENTRY * sizeof(u32)) - -static int __init -smp_85xx_kick_cpu(int nr) +struct epapr_spin_table { + u32 addr_h; + u32 addr_l; + u32 r3_h; + u32 r3_l; + u32 reserved; + u32 pir; +}; + +static struct ccsr_guts __iomem *guts; +static u64 timebase; +static int tb_req; +static int tb_valid; + +static void mpc85xx_timebase_freeze(int freeze) +{ + uint32_t mask; + + mask = CCSR_GUTS_DEVDISR_TB0 | CCSR_GUTS_DEVDISR_TB1; + if (freeze) + setbits32(&guts->devdisr, mask); + else + clrbits32(&guts->devdisr, mask); + + in_be32(&guts->devdisr); +} + +static void mpc85xx_give_timebase(void) +{ + unsigned long flags; + + local_irq_save(flags); + + while (!tb_req) + barrier(); + tb_req = 0; + + mpc85xx_timebase_freeze(1); + timebase = get_tb(); + mb(); + tb_valid = 1; + + while (tb_valid) + barrier(); + + mpc85xx_timebase_freeze(0); + + local_irq_restore(flags); +} + +static void mpc85xx_take_timebase(void) +{ + unsigned long flags; + + local_irq_save(flags); + + tb_req = 1; + while (!tb_valid) + barrier(); + + set_tb(timebase >> 32, timebase & 0xffffffff); + isync(); + tb_valid = 0; + + local_irq_restore(flags); +} + +#ifdef CONFIG_HOTPLUG_CPU +static void __cpuinit smp_85xx_mach_cpu_die(void) +{ + unsigned int cpu = smp_processor_id(); + u32 tmp; + + local_irq_disable(); + idle_task_exit(); + generic_set_cpu_dead(cpu); + mb(); + + mtspr(SPRN_TCR, 0); + + __flush_disable_L1(); + tmp = (mfspr(SPRN_HID0) & ~(HID0_DOZE|HID0_SLEEP)) | HID0_NAP; + mtspr(SPRN_HID0, tmp); + isync(); + + /* Enter NAP mode. */ + tmp = mfmsr(); + tmp |= MSR_WE; + mb(); + mtmsr(tmp); + isync(); + + while (1) + ; +} +#endif + +static int __cpuinit smp_85xx_kick_cpu(int nr) { unsigned long flags; const u64 *cpu_rel_addr; - __iomem u32 *bptr_vaddr; + __iomem struct epapr_spin_table *spin_table; struct device_node *np; - int n = 0, hw_cpu = get_hard_smp_processor_id(nr); + int hw_cpu = get_hard_smp_processor_id(nr); int ioremappable; + int ret = 0; WARN_ON(nr < 0 || nr >= NR_CPUS); WARN_ON(hw_cpu < 0 || hw_cpu >= NR_CPUS); @@ -75,46 +161,81 @@ smp_85xx_kick_cpu(int nr) /* Map the spin table */ if (ioremappable) - bptr_vaddr = ioremap(*cpu_rel_addr, SIZE_BOOT_ENTRY); + spin_table = ioremap(*cpu_rel_addr, + sizeof(struct epapr_spin_table)); else - bptr_vaddr = phys_to_virt(*cpu_rel_addr); + spin_table = phys_to_virt(*cpu_rel_addr); local_irq_save(flags); - - out_be32(bptr_vaddr + BOOT_ENTRY_PIR, hw_cpu); #ifdef CONFIG_PPC32 - out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start)); +#ifdef CONFIG_HOTPLUG_CPU + /* Corresponding to generic_set_cpu_dead() */ + generic_set_cpu_up(nr); + + if (system_state == SYSTEM_RUNNING) { + out_be32(&spin_table->addr_l, 0); + + /* + * We don't set the BPTR register here since it already points + * to the boot page properly. + */ + mpic_reset_core(hw_cpu); + + /* wait until core is ready... */ + if (!spin_event_timeout(in_be32(&spin_table->addr_l) == 1, + 10000, 100)) { + pr_err("%s: timeout waiting for core %d to reset\n", + __func__, hw_cpu); + ret = -ENOENT; + goto out; + } + + /* clear the acknowledge status */ + __secondary_hold_acknowledge = -1; + } +#endif + out_be32(&spin_table->pir, hw_cpu); + out_be32(&spin_table->addr_l, __pa(__early_start)); if (!ioremappable) - flush_dcache_range((ulong)bptr_vaddr, - (ulong)(bptr_vaddr + SIZE_BOOT_ENTRY)); + flush_dcache_range((ulong)spin_table, + (ulong)spin_table + sizeof(struct epapr_spin_table)); /* Wait a bit for the CPU to ack. */ - while ((__secondary_hold_acknowledge != hw_cpu) && (++n < 1000)) - mdelay(1); + if (!spin_event_timeout(__secondary_hold_acknowledge == hw_cpu, + 10000, 100)) { + pr_err("%s: timeout waiting for core %d to ack\n", + __func__, hw_cpu); + ret = -ENOENT; + goto out; + } +out: #else smp_generic_kick_cpu(nr); - out_be64((u64 *)(bptr_vaddr + BOOT_ENTRY_ADDR_UPPER), - __pa((u64)*((unsigned long long *) generic_secondary_smp_init))); + out_be32(&spin_table->pir, hw_cpu); + out_be64((u64 *)(&spin_table->addr_h), + __pa((u64)*((unsigned long long *)generic_secondary_smp_init))); if (!ioremappable) - flush_dcache_range((ulong)bptr_vaddr, - (ulong)(bptr_vaddr + SIZE_BOOT_ENTRY)); + flush_dcache_range((ulong)spin_table, + (ulong)spin_table + sizeof(struct epapr_spin_table)); #endif local_irq_restore(flags); if (ioremappable) - iounmap(bptr_vaddr); - - pr_debug("waited %d msecs for CPU #%d.\n", n, nr); + iounmap(spin_table); - return 0; + return ret; } struct smp_ops_t smp_85xx_ops = { .kick_cpu = smp_85xx_kick_cpu, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_disable = generic_cpu_disable, + .cpu_die = generic_cpu_die, +#endif #ifdef CONFIG_KEXEC .give_timebase = smp_generic_give_timebase, .take_timebase = smp_generic_take_timebase, @@ -218,8 +339,7 @@ static void mpc85xx_smp_machine_kexec(struct kimage *image) } #endif /* CONFIG_KEXEC */ -static void __init -smp_85xx_setup_cpu(int cpu_nr) +static void __cpuinit smp_85xx_setup_cpu(int cpu_nr) { if (smp_85xx_ops.probe == smp_mpic_probe) mpic_setup_this_cpu(); @@ -228,6 +348,16 @@ smp_85xx_setup_cpu(int cpu_nr) doorbell_setup_this_cpu(); } +static const struct of_device_id mpc85xx_smp_guts_ids[] = { + { .compatible = "fsl,mpc8572-guts", }, + { .compatible = "fsl,p1020-guts", }, + { .compatible = "fsl,p1021-guts", }, + { .compatible = "fsl,p1022-guts", }, + { .compatible = "fsl,p1023-guts", }, + { .compatible = "fsl,p2020-guts", }, + {}, +}; + void __init mpc85xx_smp_init(void) { struct device_node *np; @@ -249,6 +379,22 @@ void __init mpc85xx_smp_init(void) smp_85xx_ops.cause_ipi = doorbell_cause_ipi; } + np = of_find_matching_node(NULL, mpc85xx_smp_guts_ids); + if (np) { + guts = of_iomap(np, 0); + of_node_put(np); + if (!guts) { + pr_err("%s: Could not map guts node address\n", + __func__); + return; + } + smp_85xx_ops.give_timebase = mpc85xx_give_timebase; + smp_85xx_ops.take_timebase = mpc85xx_take_timebase; +#ifdef CONFIG_HOTPLUG_CPU + ppc_md.cpu_die = smp_85xx_mach_cpu_die; +#endif + } + smp_ops = &smp_85xx_ops; #ifdef CONFIG_KEXEC |