| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Paul Mackerras | 2065 | 58.73% | 8 | 12.70% |
| Benjamin Herrenschmidt | 1083 | 30.80% | 14 | 22.22% |
| Milton D. Miller II | 147 | 4.18% | 5 | 7.94% |
| Sebastian Andrzej Siewior | 55 | 1.56% | 1 | 1.59% |
| Afzal Mohammed | 26 | 0.74% | 1 | 1.59% |
| Stephen Rothwell | 25 | 0.71% | 3 | 4.76% |
| Michael Ellerman | 24 | 0.68% | 5 | 7.94% |
| Grant C. Likely | 18 | 0.51% | 7 | 11.11% |
| Jordan Niethe | 16 | 0.46% | 2 | 3.17% |
| Ilie Halip | 11 | 0.31% | 1 | 1.59% |
| Johannes Berg | 7 | 0.20% | 1 | 1.59% |
| Mike Rapoport | 6 | 0.17% | 1 | 1.59% |
| Nicholas Piggin | 5 | 0.14% | 1 | 1.59% |
| Rusty Russell | 4 | 0.11% | 1 | 1.59% |
| Nathan T. Lynch | 4 | 0.11% | 1 | 1.59% |
| Thomas Gleixner | 4 | 0.11% | 2 | 3.17% |
| Guenter Roeck | 4 | 0.11% | 1 | 1.59% |
| Ingo Molnar | 3 | 0.09% | 1 | 1.59% |
| Anton Blanchard | 2 | 0.06% | 1 | 1.59% |
| Christophe Leroy | 2 | 0.06% | 1 | 1.59% |
| Daniel Axtens | 1 | 0.03% | 1 | 1.59% |
| Olaf Hering | 1 | 0.03% | 1 | 1.59% |
| Al Viro | 1 | 0.03% | 1 | 1.59% |
| Jeremy Kerr | 1 | 0.03% | 1 | 1.59% |
| Dmitry Torokhov | 1 | 0.03% | 1 | 1.59% |
| Total | 3516 | 63 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * SMP support for power macintosh. * * We support both the old "powersurge" SMP architecture * and the current Core99 (G4 PowerMac) machines. * * Note that we don't support the very first rev. of * Apple/DayStar 2 CPUs board, the one with the funky * watchdog. Hopefully, none of these should be there except * maybe internally to Apple. I should probably still add some * code to detect this card though and disable SMP. --BenH. * * Support Macintosh G4 SMP by Troy Benjegerdes (hozer@drgw.net) * and Ben Herrenschmidt <benh@kernel.crashing.org>. * * Support for DayStar quad CPU cards * Copyright (C) XLR8, Inc. 1994-2000 */ #include <linux/kernel.h> #include <linux/sched.h> #include <linux/sched/hotplug.h> #include <linux/smp.h> #include <linux/interrupt.h> #include <linux/kernel_stat.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/spinlock.h> #include <linux/errno.h> #include <linux/hardirq.h> #include <linux/cpu.h> #include <linux/compiler.h> #include <linux/pgtable.h> #include <asm/ptrace.h> #include <linux/atomic.h> #include <asm/code-patching.h> #include <asm/irq.h> #include <asm/page.h> #include <asm/sections.h> #include <asm/io.h> #include <asm/prom.h> #include <asm/smp.h> #include <asm/machdep.h> #include <asm/pmac_feature.h> #include <asm/time.h> #include <asm/mpic.h> #include <asm/cacheflush.h> #include <asm/keylargo.h> #include <asm/pmac_low_i2c.h> #include <asm/pmac_pfunc.h> #include <asm/inst.h> #include "pmac.h" #undef DEBUG #ifdef DEBUG #define DBG(fmt...) udbg_printf(fmt) #else #define DBG(fmt...) #endif extern void __secondary_start_pmac_0(void); static void (*pmac_tb_freeze)(int freeze); static u64 timebase; static int tb_req; #ifdef CONFIG_PPC_PMAC32_PSURGE /* * Powersurge (old powermac SMP) support. */ /* Addresses for powersurge registers */ #define HAMMERHEAD_BASE 0xf8000000 #define HHEAD_CONFIG 0x90 #define HHEAD_SEC_INTR 0xc0 /* register for interrupting the primary processor on the powersurge */ /* N.B. this is actually the ethernet ROM! */ #define PSURGE_PRI_INTR 0xf3019000 /* register for storing the start address for the secondary processor */ /* N.B. this is the PCI config space address register for the 1st bridge */ #define PSURGE_START 0xf2800000 /* Daystar/XLR8 4-CPU card */ #define PSURGE_QUAD_REG_ADDR 0xf8800000 #define PSURGE_QUAD_IRQ_SET 0 #define PSURGE_QUAD_IRQ_CLR 1 #define PSURGE_QUAD_IRQ_PRIMARY 2 #define PSURGE_QUAD_CKSTOP_CTL 3 #define PSURGE_QUAD_PRIMARY_ARB 4 #define PSURGE_QUAD_BOARD_ID 6 #define PSURGE_QUAD_WHICH_CPU 7 #define PSURGE_QUAD_CKSTOP_RDBK 8 #define PSURGE_QUAD_RESET_CTL 11 #define PSURGE_QUAD_OUT(r, v) (out_8(quad_base + ((r) << 4) + 4, (v))) #define PSURGE_QUAD_IN(r) (in_8(quad_base + ((r) << 4) + 4) & 0x0f) #define PSURGE_QUAD_BIS(r, v) (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) | (v))) #define PSURGE_QUAD_BIC(r, v) (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) & ~(v))) /* virtual addresses for the above */ static volatile u8 __iomem *hhead_base; static volatile u8 __iomem *quad_base; static volatile u32 __iomem *psurge_pri_intr; static volatile u8 __iomem *psurge_sec_intr; static volatile u32 __iomem *psurge_start; /* values for psurge_type */ #define PSURGE_NONE -1 #define PSURGE_DUAL 0 #define PSURGE_QUAD_OKEE 1 #define PSURGE_QUAD_COTTON 2 #define PSURGE_QUAD_ICEGRASS 3 /* what sort of powersurge board we have */ static int psurge_type = PSURGE_NONE; /* irq for secondary cpus to report */ static struct irq_domain *psurge_host; int psurge_secondary_virq; /* * Set and clear IPIs for powersurge. */ static inline void psurge_set_ipi(int cpu) { if (psurge_type == PSURGE_NONE) return; if (cpu == 0) in_be32(psurge_pri_intr); else if (psurge_type == PSURGE_DUAL) out_8(psurge_sec_intr, 0); else PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_SET, 1 << cpu); } static inline void psurge_clr_ipi(int cpu) { if (cpu > 0) { switch(psurge_type) { case PSURGE_DUAL: out_8(psurge_sec_intr, ~0); case PSURGE_NONE: break; default: PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, 1 << cpu); } } } /* * On powersurge (old SMP powermac architecture) we don't have * separate IPIs for separate messages like openpic does. Instead * use the generic demux helpers * -- paulus. */ static irqreturn_t psurge_ipi_intr(int irq, void *d) { psurge_clr_ipi(smp_processor_id()); smp_ipi_demux(); return IRQ_HANDLED; } static void smp_psurge_cause_ipi(int cpu) { psurge_set_ipi(cpu); } static int psurge_host_map(struct irq_domain *h, unsigned int virq, irq_hw_number_t hw) { irq_set_chip_and_handler(virq, &dummy_irq_chip, handle_percpu_irq); return 0; } static const struct irq_domain_ops psurge_host_ops = { .map = psurge_host_map, }; static int psurge_secondary_ipi_init(void) { int rc = -ENOMEM; psurge_host = irq_domain_add_nomap(NULL, ~0, &psurge_host_ops, NULL); if (psurge_host) psurge_secondary_virq = irq_create_direct_mapping(psurge_host); if (psurge_secondary_virq) rc = request_irq(psurge_secondary_virq, psurge_ipi_intr, IRQF_PERCPU | IRQF_NO_THREAD, "IPI", NULL); if (rc) pr_err("Failed to setup secondary cpu IPI\n"); return rc; } /* * Determine a quad card presence. We read the board ID register, we * force the data bus to change to something else, and we read it again. * It it's stable, then the register probably exist (ugh !) */ static int __init psurge_quad_probe(void) { int type; unsigned int i; type = PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID); if (type < PSURGE_QUAD_OKEE || type > PSURGE_QUAD_ICEGRASS || type != PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID)) return PSURGE_DUAL; /* looks OK, try a slightly more rigorous test */ /* bogus is not necessarily cacheline-aligned, though I don't suppose that really matters. -- paulus */ for (i = 0; i < 100; i++) { volatile u32 bogus[8]; bogus[(0+i)%8] = 0x00000000; bogus[(1+i)%8] = 0x55555555; bogus[(2+i)%8] = 0xFFFFFFFF; bogus[(3+i)%8] = 0xAAAAAAAA; bogus[(4+i)%8] = 0x33333333; bogus[(5+i)%8] = 0xCCCCCCCC; bogus[(6+i)%8] = 0xCCCCCCCC; bogus[(7+i)%8] = 0x33333333; wmb(); asm volatile("dcbf 0,%0" : : "r" (bogus) : "memory"); mb(); if (type != PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID)) return PSURGE_DUAL; } return type; } static void __init psurge_quad_init(void) { int procbits; if (ppc_md.progress) ppc_md.progress("psurge_quad_init", 0x351); procbits = ~PSURGE_QUAD_IN(PSURGE_QUAD_WHICH_CPU); if (psurge_type == PSURGE_QUAD_ICEGRASS) PSURGE_QUAD_BIS(PSURGE_QUAD_RESET_CTL, procbits); else PSURGE_QUAD_BIC(PSURGE_QUAD_CKSTOP_CTL, procbits); mdelay(33); out_8(psurge_sec_intr, ~0); PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, procbits); PSURGE_QUAD_BIS(PSURGE_QUAD_RESET_CTL, procbits); if (psurge_type != PSURGE_QUAD_ICEGRASS) PSURGE_QUAD_BIS(PSURGE_QUAD_CKSTOP_CTL, procbits); PSURGE_QUAD_BIC(PSURGE_QUAD_PRIMARY_ARB, procbits); mdelay(33); PSURGE_QUAD_BIC(PSURGE_QUAD_RESET_CTL, procbits); mdelay(33); PSURGE_QUAD_BIS(PSURGE_QUAD_PRIMARY_ARB, procbits); mdelay(33); } static void __init smp_psurge_probe(void) { int i, ncpus; struct device_node *dn; /* We don't do SMP on the PPC601 -- paulus */ if (PVR_VER(mfspr(SPRN_PVR)) == 1) return; /* * The powersurge cpu board can be used in the generation * of powermacs that have a socket for an upgradeable cpu card, * including the 7500, 8500, 9500, 9600. * The device tree doesn't tell you if you have 2 cpus because * OF doesn't know anything about the 2nd processor. * Instead we look for magic bits in magic registers, * in the hammerhead memory controller in the case of the * dual-cpu powersurge board. -- paulus. */ dn = of_find_node_by_name(NULL, "hammerhead"); if (dn == NULL) return; of_node_put(dn); hhead_base = ioremap(HAMMERHEAD_BASE, 0x800); quad_base = ioremap(PSURGE_QUAD_REG_ADDR, 1024); psurge_sec_intr = hhead_base + HHEAD_SEC_INTR; psurge_type = psurge_quad_probe(); if (psurge_type != PSURGE_DUAL) { psurge_quad_init(); /* All released cards using this HW design have 4 CPUs */ ncpus = 4; /* No sure how timebase sync works on those, let's use SW */ smp_ops->give_timebase = smp_generic_give_timebase; smp_ops->take_timebase = smp_generic_take_timebase; } else { iounmap(quad_base); if ((in_8(hhead_base + HHEAD_CONFIG) & 0x02) == 0) { /* not a dual-cpu card */ iounmap(hhead_base); psurge_type = PSURGE_NONE; return; } ncpus = 2; } if (psurge_secondary_ipi_init()) return; psurge_start = ioremap(PSURGE_START, 4); psurge_pri_intr = ioremap(PSURGE_PRI_INTR, 4); /* This is necessary because OF doesn't know about the * secondary cpu(s), and thus there aren't nodes in the * device tree for them, and smp_setup_cpu_maps hasn't * set their bits in cpu_present_mask. */ if (ncpus > NR_CPUS) ncpus = NR_CPUS; for (i = 1; i < ncpus ; ++i) set_cpu_present(i, true); if (ppc_md.progress) ppc_md.progress("smp_psurge_probe - done", 0x352); } static int __init smp_psurge_kick_cpu(int nr) { unsigned long start = __pa(__secondary_start_pmac_0) + nr * 8; unsigned long a, flags; int i, j; /* Defining this here is evil ... but I prefer hiding that * crap to avoid giving people ideas that they can do the * same. */ extern volatile unsigned int cpu_callin_map[NR_CPUS]; /* may need to flush here if secondary bats aren't setup */ for (a = KERNELBASE; a < KERNELBASE + 0x800000; a += 32) asm volatile("dcbf 0,%0" : : "r" (a) : "memory"); asm volatile("sync"); if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu", 0x353); /* This is going to freeze the timeebase, we disable interrupts */ local_irq_save(flags); out_be32(psurge_start, start); mb(); psurge_set_ipi(nr); /* * We can't use udelay here because the timebase is now frozen. */ for (i = 0; i < 2000; ++i) asm volatile("nop" : : : "memory"); psurge_clr_ipi(nr); /* * Also, because the timebase is frozen, we must not return to the * caller which will try to do udelay's etc... Instead, we wait -here- * for the CPU to callin. */ for (i = 0; i < 100000 && !cpu_callin_map[nr]; ++i) { for (j = 1; j < 10000; j++) asm volatile("nop" : : : "memory"); asm volatile("sync" : : : "memory"); } if (!cpu_callin_map[nr]) goto stuck; /* And we do the TB sync here too for standard dual CPU cards */ if (psurge_type == PSURGE_DUAL) { while(!tb_req) barrier(); tb_req = 0; mb(); timebase = get_tb(); mb(); while (timebase) barrier(); mb(); } stuck: /* now interrupt the secondary, restarting both TBs */ if (psurge_type == PSURGE_DUAL) psurge_set_ipi(1); if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu - done", 0x354); return 0; } static void __init smp_psurge_setup_cpu(int cpu_nr) { unsigned long flags = IRQF_PERCPU | IRQF_NO_THREAD; int irq; if (cpu_nr != 0 || !psurge_start) return; /* reset the entry point so if we get another intr we won't * try to startup again */ out_be32(psurge_start, 0x100); irq = irq_create_mapping(NULL, 30); if (request_irq(irq, psurge_ipi_intr, flags, "primary IPI", NULL)) printk(KERN_ERR "Couldn't get primary IPI interrupt"); } void __init smp_psurge_take_timebase(void) { if (psurge_type != PSURGE_DUAL) return; tb_req = 1; mb(); while (!timebase) barrier(); mb(); set_tb(timebase >> 32, timebase & 0xffffffff); timebase = 0; mb(); set_dec(tb_ticks_per_jiffy/2); } void __init smp_psurge_give_timebase(void) { /* Nothing to do here */ } /* PowerSurge-style Macs */ struct smp_ops_t psurge_smp_ops = { .message_pass = NULL, /* Use smp_muxed_ipi_message_pass */ .cause_ipi = smp_psurge_cause_ipi, .cause_nmi_ipi = NULL, .probe = smp_psurge_probe, .kick_cpu = smp_psurge_kick_cpu, .setup_cpu = smp_psurge_setup_cpu, .give_timebase = smp_psurge_give_timebase, .take_timebase = smp_psurge_take_timebase, }; #endif /* CONFIG_PPC_PMAC32_PSURGE */ /* * Core 99 and later support */ static void smp_core99_give_timebase(void) { unsigned long flags; local_irq_save(flags); while(!tb_req) barrier(); tb_req = 0; (*pmac_tb_freeze)(1); mb(); timebase = get_tb(); mb(); while (timebase) barrier(); mb(); (*pmac_tb_freeze)(0); mb(); local_irq_restore(flags); } static void smp_core99_take_timebase(void) { unsigned long flags; local_irq_save(flags); tb_req = 1; mb(); while (!timebase) barrier(); mb(); set_tb(timebase >> 32, timebase & 0xffffffff); timebase = 0; mb(); local_irq_restore(flags); } #ifdef CONFIG_PPC64 /* * G5s enable/disable the timebase via an i2c-connected clock chip. */ static struct pmac_i2c_bus *pmac_tb_clock_chip_host; static u8 pmac_tb_pulsar_addr; static void smp_core99_cypress_tb_freeze(int freeze) { u8 data; int rc; /* Strangely, the device-tree says address is 0xd2, but darwin * accesses 0xd0 ... */ pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_combined); rc = pmac_i2c_xfer(pmac_tb_clock_chip_host, 0xd0 | pmac_i2c_read, 1, 0x81, &data, 1); if (rc != 0) goto bail; data = (data & 0xf3) | (freeze ? 0x00 : 0x0c); pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub); rc = pmac_i2c_xfer(pmac_tb_clock_chip_host, 0xd0 | pmac_i2c_write, 1, 0x81, &data, 1); bail: if (rc != 0) { printk("Cypress Timebase %s rc: %d\n", freeze ? "freeze" : "unfreeze", rc); panic("Timebase freeze failed !\n"); } } static void smp_core99_pulsar_tb_freeze(int freeze) { u8 data; int rc; pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_combined); rc = pmac_i2c_xfer(pmac_tb_clock_chip_host, pmac_tb_pulsar_addr | pmac_i2c_read, 1, 0x2e, &data, 1); if (rc != 0) goto bail; data = (data & 0x88) | (freeze ? 0x11 : 0x22); pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub); rc = pmac_i2c_xfer(pmac_tb_clock_chip_host, pmac_tb_pulsar_addr | pmac_i2c_write, 1, 0x2e, &data, 1); bail: if (rc != 0) { printk(KERN_ERR "Pulsar Timebase %s rc: %d\n", freeze ? "freeze" : "unfreeze", rc); panic("Timebase freeze failed !\n"); } } static void __init smp_core99_setup_i2c_hwsync(int ncpus) { struct device_node *cc = NULL; struct device_node *p; const char *name = NULL; const u32 *reg; int ok; /* Look for the clock chip */ for_each_node_by_name(cc, "i2c-hwclock") { p = of_get_parent(cc); ok = p && of_device_is_compatible(p, "uni-n-i2c"); of_node_put(p); if (!ok) continue; pmac_tb_clock_chip_host = pmac_i2c_find_bus(cc); if (pmac_tb_clock_chip_host == NULL) continue; reg = of_get_property(cc, "reg", NULL); if (reg == NULL) continue; switch (*reg) { case 0xd2: if (of_device_is_compatible(cc,"pulsar-legacy-slewing")) { pmac_tb_freeze = smp_core99_pulsar_tb_freeze; pmac_tb_pulsar_addr = 0xd2; name = "Pulsar"; } else if (of_device_is_compatible(cc, "cy28508")) { pmac_tb_freeze = smp_core99_cypress_tb_freeze; name = "Cypress"; } break; case 0xd4: pmac_tb_freeze = smp_core99_pulsar_tb_freeze; pmac_tb_pulsar_addr = 0xd4; name = "Pulsar"; break; } if (pmac_tb_freeze != NULL) break; } if (pmac_tb_freeze != NULL) { /* Open i2c bus for synchronous access */ if (pmac_i2c_open(pmac_tb_clock_chip_host, 1)) { printk(KERN_ERR "Failed top open i2c bus for clock" " sync, fallback to software sync !\n"); goto no_i2c_sync; } printk(KERN_INFO "Processor timebase sync using %s i2c clock\n", name); return; } no_i2c_sync: pmac_tb_freeze = NULL; pmac_tb_clock_chip_host = NULL; } /* * Newer G5s uses a platform function */ static void smp_core99_pfunc_tb_freeze(int freeze) { struct device_node *cpus; struct pmf_args args; cpus = of_find_node_by_path("/cpus"); BUG_ON(cpus == NULL); args.count = 1; args.u[0].v = !freeze; pmf_call_function(cpus, "cpu-timebase", &args); of_node_put(cpus); } #else /* CONFIG_PPC64 */ /* * SMP G4 use a GPIO to enable/disable the timebase. */ static unsigned int core99_tb_gpio; /* Timebase freeze GPIO */ static void smp_core99_gpio_tb_freeze(int freeze) { if (freeze) pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 4); else pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 0); pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0); } #endif /* !CONFIG_PPC64 */ static void core99_init_caches(int cpu) { #ifndef CONFIG_PPC64 /* L2 and L3 cache settings to pass from CPU0 to CPU1 on G4 cpus */ static long int core99_l2_cache; static long int core99_l3_cache; if (!cpu_has_feature(CPU_FTR_L2CR)) return; if (cpu == 0) { core99_l2_cache = _get_L2CR(); printk("CPU0: L2CR is %lx\n", core99_l2_cache); } else { printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR()); _set_L2CR(0); _set_L2CR(core99_l2_cache); printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache); } if (!cpu_has_feature(CPU_FTR_L3CR)) return; if (cpu == 0){ core99_l3_cache = _get_L3CR(); printk("CPU0: L3CR is %lx\n", core99_l3_cache); } else { printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR()); _set_L3CR(0); _set_L3CR(core99_l3_cache); printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache); } #endif /* !CONFIG_PPC64 */ } static void __init smp_core99_setup(int ncpus) { #ifdef CONFIG_PPC64 /* i2c based HW sync on some G5s */ if (of_machine_is_compatible("PowerMac7,2") || of_machine_is_compatible("PowerMac7,3") || of_machine_is_compatible("RackMac3,1")) smp_core99_setup_i2c_hwsync(ncpus); /* pfunc based HW sync on recent G5s */ if (pmac_tb_freeze == NULL) { struct device_node *cpus = of_find_node_by_path("/cpus"); if (cpus && of_get_property(cpus, "platform-cpu-timebase", NULL)) { pmac_tb_freeze = smp_core99_pfunc_tb_freeze; printk(KERN_INFO "Processor timebase sync using" " platform function\n"); } } #else /* CONFIG_PPC64 */ /* GPIO based HW sync on ppc32 Core99 */ if (pmac_tb_freeze == NULL && !of_machine_is_compatible("MacRISC4")) { struct device_node *cpu; const u32 *tbprop = NULL; core99_tb_gpio = KL_GPIO_TB_ENABLE; /* default value */ cpu = of_find_node_by_type(NULL, "cpu"); if (cpu != NULL) { tbprop = of_get_property(cpu, "timebase-enable", NULL); if (tbprop) core99_tb_gpio = *tbprop; of_node_put(cpu); } pmac_tb_freeze = smp_core99_gpio_tb_freeze; printk(KERN_INFO "Processor timebase sync using" " GPIO 0x%02x\n", core99_tb_gpio); } #endif /* CONFIG_PPC64 */ /* No timebase sync, fallback to software */ if (pmac_tb_freeze == NULL) { smp_ops->give_timebase = smp_generic_give_timebase; smp_ops->take_timebase = smp_generic_take_timebase; printk(KERN_INFO "Processor timebase sync using software\n"); } #ifndef CONFIG_PPC64 { int i; /* XXX should get this from reg properties */ for (i = 1; i < ncpus; ++i) set_hard_smp_processor_id(i, i); } #endif /* 32 bits SMP can't NAP */ if (!of_machine_is_compatible("MacRISC4")) powersave_nap = 0; } static void __init smp_core99_probe(void) { struct device_node *cpus; int ncpus = 0; if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345); /* Count CPUs in the device-tree */ for_each_node_by_type(cpus, "cpu") ++ncpus; printk(KERN_INFO "PowerMac SMP probe found %d cpus\n", ncpus); /* Nothing more to do if less than 2 of them */ if (ncpus <= 1) return; /* We need to perform some early initialisations before we can start * setting up SMP as we are running before initcalls */ pmac_pfunc_base_install(); pmac_i2c_init(); /* Setup various bits like timebase sync method, ability to nap, ... */ smp_core99_setup(ncpus); /* Install IPIs */ mpic_request_ipis(); /* Collect l2cr and l3cr values from CPU 0 */ core99_init_caches(0); } static int smp_core99_kick_cpu(int nr) { unsigned int save_vector; unsigned long target, flags; unsigned int *vector = (unsigned int *)(PAGE_OFFSET+0x100); if (nr < 0 || nr > 3) return -ENOENT; if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu", 0x346); local_irq_save(flags); /* Save reset vector */ save_vector = *vector; /* Setup fake reset vector that does * b __secondary_start_pmac_0 + nr*8 */ target = (unsigned long) __secondary_start_pmac_0 + nr * 8; patch_branch((struct ppc_inst *)vector, target, BRANCH_SET_LINK); /* Put some life in our friend */ pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0); /* FIXME: We wait a bit for the CPU to take the exception, I should * instead wait for the entry code to set something for me. Well, * ideally, all that crap will be done in prom.c and the CPU left * in a RAM-based wait loop like CHRP. */ mdelay(1); /* Restore our exception vector */ patch_instruction((struct ppc_inst *)vector, ppc_inst(save_vector)); local_irq_restore(flags); if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347); return 0; } static void smp_core99_setup_cpu(int cpu_nr) { /* Setup L2/L3 */ if (cpu_nr != 0) core99_init_caches(cpu_nr); /* Setup openpic */ mpic_setup_this_cpu(); } #ifdef CONFIG_PPC64 #ifdef CONFIG_HOTPLUG_CPU static unsigned int smp_core99_host_open; static int smp_core99_cpu_prepare(unsigned int cpu) { int rc; /* Open i2c bus if it was used for tb sync */ if (pmac_tb_clock_chip_host && !smp_core99_host_open) { rc = pmac_i2c_open(pmac_tb_clock_chip_host, 1); if (rc) { pr_err("Failed to open i2c bus for time sync\n"); return notifier_from_errno(rc); } smp_core99_host_open = 1; } return 0; } static int smp_core99_cpu_online(unsigned int cpu) { /* Close i2c bus if it was used for tb sync */ if (pmac_tb_clock_chip_host && smp_core99_host_open) { pmac_i2c_close(pmac_tb_clock_chip_host); smp_core99_host_open = 0; } return 0; } #endif /* CONFIG_HOTPLUG_CPU */ static void __init smp_core99_bringup_done(void) { extern void g5_phy_disable_cpu1(void); /* Close i2c bus if it was used for tb sync */ if (pmac_tb_clock_chip_host) pmac_i2c_close(pmac_tb_clock_chip_host); /* If we didn't start the second CPU, we must take * it off the bus. */ if (of_machine_is_compatible("MacRISC4") && num_online_cpus() < 2) { set_cpu_present(1, false); g5_phy_disable_cpu1(); } #ifdef CONFIG_HOTPLUG_CPU cpuhp_setup_state_nocalls(CPUHP_POWERPC_PMAC_PREPARE, "powerpc/pmac:prepare", smp_core99_cpu_prepare, NULL); cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "powerpc/pmac:online", smp_core99_cpu_online, NULL); #endif if (ppc_md.progress) ppc_md.progress("smp_core99_bringup_done", 0x349); } #endif /* CONFIG_PPC64 */ #ifdef CONFIG_HOTPLUG_CPU static int smp_core99_cpu_disable(void) { int rc = generic_cpu_disable(); if (rc) return rc; mpic_cpu_set_priority(0xf); return 0; } #ifdef CONFIG_PPC32 static void pmac_cpu_die(void) { int cpu = smp_processor_id(); local_irq_disable(); idle_task_exit(); pr_debug("CPU%d offline\n", cpu); generic_set_cpu_dead(cpu); smp_wmb(); mb(); low_cpu_die(); } #else /* CONFIG_PPC32 */ static void pmac_cpu_die(void) { int cpu = smp_processor_id(); local_irq_disable(); idle_task_exit(); /* * turn off as much as possible, we'll be * kicked out as this will only be invoked * on core99 platforms for now ... */ printk(KERN_INFO "CPU#%d offline\n", cpu); generic_set_cpu_dead(cpu); smp_wmb(); /* * Re-enable interrupts. The NAP code needs to enable them * anyways, do it now so we deal with the case where one already * happened while soft-disabled. * We shouldn't get any external interrupts, only decrementer, and the * decrementer handler is safe for use on offline CPUs */ local_irq_enable(); while (1) { /* let's not take timer interrupts too often ... */ set_dec(0x7fffffff); /* Enter NAP mode */ power4_idle(); } } #endif /* else CONFIG_PPC32 */ #endif /* CONFIG_HOTPLUG_CPU */ /* Core99 Macs (dual G4s and G5s) */ static struct smp_ops_t core99_smp_ops = { .message_pass = smp_mpic_message_pass, .probe = smp_core99_probe, #ifdef CONFIG_PPC64 .bringup_done = smp_core99_bringup_done, #endif .kick_cpu = smp_core99_kick_cpu, .setup_cpu = smp_core99_setup_cpu, .give_timebase = smp_core99_give_timebase, .take_timebase = smp_core99_take_timebase, #if defined(CONFIG_HOTPLUG_CPU) .cpu_disable = smp_core99_cpu_disable, .cpu_die = generic_cpu_die, #endif }; void __init pmac_setup_smp(void) { struct device_node *np; /* Check for Core99 */ np = of_find_node_by_name(NULL, "uni-n"); if (!np) np = of_find_node_by_name(NULL, "u3"); if (!np) np = of_find_node_by_name(NULL, "u4"); if (np) { of_node_put(np); smp_ops = &core99_smp_ops; } #ifdef CONFIG_PPC_PMAC32_PSURGE else { /* We have to set bits in cpu_possible_mask here since the * secondary CPU(s) aren't in the device tree. Various * things won't be initialized for CPUs not in the possible * map, so we really need to fix it up here. */ int cpu; for (cpu = 1; cpu < 4 && cpu < NR_CPUS; ++cpu) set_cpu_possible(cpu, true); smp_ops = &psurge_smp_ops; } #endif /* CONFIG_PPC_PMAC32_PSURGE */ #ifdef CONFIG_HOTPLUG_CPU ppc_md.cpu_die = pmac_cpu_die; #endif }
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