diff options
Diffstat (limited to 'arch/powerpc/platforms/powermac/smp.c')
| -rw-r--r-- | arch/powerpc/platforms/powermac/smp.c | 1025 |
1 files changed, 1025 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c new file mode 100644 index 000000000..5b26a9012 --- /dev/null +++ b/arch/powerpc/platforms/powermac/smp.c @@ -0,0 +1,1025 @@ +// 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/irqdomain.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/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); + break; + 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 __init 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; + + /* + * 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"); + } + of_node_put(cpus); + } + +#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(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(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) +{ + /* 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); + + cleanup_cpu_mmu_context(); + + return 0; +} + +#ifdef CONFIG_PPC32 + +static void pmac_cpu_offline_self(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_offline_self(); +} + +#else /* CONFIG_PPC32 */ + +static void pmac_cpu_offline_self(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 + smp_ops->cpu_offline_self = pmac_cpu_offline_self; +#endif +} + + |