| // 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 |
| } |
| |
| |