Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Author: Andy Fleming <afleming@freescale.com> |
| 3 | * Kumar Gala <galak@kernel.crashing.org> |
| 4 | * |
| 5 | * Copyright 2006-2008 Freescale Semiconductor Inc. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License as published by the |
| 9 | * Free Software Foundation; either version 2 of the License, or (at your |
| 10 | * option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/stddef.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/of.h> |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 18 | #include <linux/kexec.h> |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 19 | |
| 20 | #include <asm/machdep.h> |
| 21 | #include <asm/pgtable.h> |
| 22 | #include <asm/page.h> |
| 23 | #include <asm/mpic.h> |
| 24 | #include <asm/cacheflush.h> |
Kumar Gala | 563fdd4 | 2009-02-11 22:50:42 -0600 | [diff] [blame] | 25 | #include <asm/dbell.h> |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 26 | |
| 27 | #include <sysdev/fsl_soc.h> |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 28 | #include <sysdev/mpic.h> |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 29 | |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 30 | extern void __early_start(void); |
| 31 | |
| 32 | #define BOOT_ENTRY_ADDR_UPPER 0 |
| 33 | #define BOOT_ENTRY_ADDR_LOWER 1 |
| 34 | #define BOOT_ENTRY_R3_UPPER 2 |
| 35 | #define BOOT_ENTRY_R3_LOWER 3 |
| 36 | #define BOOT_ENTRY_RESV 4 |
| 37 | #define BOOT_ENTRY_PIR 5 |
| 38 | #define BOOT_ENTRY_R6_UPPER 6 |
| 39 | #define BOOT_ENTRY_R6_LOWER 7 |
| 40 | #define NUM_BOOT_ENTRY 8 |
| 41 | #define SIZE_BOOT_ENTRY (NUM_BOOT_ENTRY * sizeof(u32)) |
| 42 | |
| 43 | static void __init |
| 44 | smp_85xx_kick_cpu(int nr) |
| 45 | { |
| 46 | unsigned long flags; |
| 47 | const u64 *cpu_rel_addr; |
| 48 | __iomem u32 *bptr_vaddr; |
| 49 | struct device_node *np; |
| 50 | int n = 0; |
Peter Tyser | d1d47ec | 2009-12-18 16:50:37 -0600 | [diff] [blame] | 51 | int ioremappable; |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 52 | |
| 53 | WARN_ON (nr < 0 || nr >= NR_CPUS); |
| 54 | |
| 55 | pr_debug("smp_85xx_kick_cpu: kick CPU #%d\n", nr); |
| 56 | |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 57 | np = of_get_cpu_node(nr, NULL); |
| 58 | cpu_rel_addr = of_get_property(np, "cpu-release-addr", NULL); |
| 59 | |
| 60 | if (cpu_rel_addr == NULL) { |
| 61 | printk(KERN_ERR "No cpu-release-addr for cpu %d\n", nr); |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 62 | return; |
| 63 | } |
| 64 | |
Peter Tyser | d1d47ec | 2009-12-18 16:50:37 -0600 | [diff] [blame] | 65 | /* |
| 66 | * A secondary core could be in a spinloop in the bootpage |
| 67 | * (0xfffff000), somewhere in highmem, or somewhere in lowmem. |
| 68 | * The bootpage and highmem can be accessed via ioremap(), but |
| 69 | * we need to directly access the spinloop if its in lowmem. |
| 70 | */ |
| 71 | ioremappable = *cpu_rel_addr > virt_to_phys(high_memory); |
| 72 | |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 73 | /* Map the spin table */ |
Peter Tyser | d1d47ec | 2009-12-18 16:50:37 -0600 | [diff] [blame] | 74 | if (ioremappable) |
| 75 | bptr_vaddr = ioremap(*cpu_rel_addr, SIZE_BOOT_ENTRY); |
| 76 | else |
| 77 | bptr_vaddr = phys_to_virt(*cpu_rel_addr); |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 78 | |
Kumar Gala | cb1ffb620 | 2009-06-19 03:30:42 -0500 | [diff] [blame] | 79 | local_irq_save(flags); |
| 80 | |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 81 | out_be32(bptr_vaddr + BOOT_ENTRY_PIR, nr); |
Kumar Gala | 5b8544c | 2010-10-08 10:37:31 -0500 | [diff] [blame] | 82 | #ifdef CONFIG_PPC32 |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 83 | out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start)); |
| 84 | |
Peter Tyser | d1d47ec | 2009-12-18 16:50:37 -0600 | [diff] [blame] | 85 | if (!ioremappable) |
| 86 | flush_dcache_range((ulong)bptr_vaddr, |
| 87 | (ulong)(bptr_vaddr + SIZE_BOOT_ENTRY)); |
| 88 | |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 89 | /* Wait a bit for the CPU to ack. */ |
| 90 | while ((__secondary_hold_acknowledge != nr) && (++n < 1000)) |
| 91 | mdelay(1); |
Kumar Gala | 5b8544c | 2010-10-08 10:37:31 -0500 | [diff] [blame] | 92 | #else |
| 93 | out_be64((u64 *)(bptr_vaddr + BOOT_ENTRY_ADDR_UPPER), |
| 94 | __pa((u64)*((unsigned long long *) generic_secondary_smp_init))); |
| 95 | |
| 96 | smp_generic_kick_cpu(nr); |
| 97 | #endif |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 98 | |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 99 | local_irq_restore(flags); |
| 100 | |
Peter Tyser | d1d47ec | 2009-12-18 16:50:37 -0600 | [diff] [blame] | 101 | if (ioremappable) |
| 102 | iounmap(bptr_vaddr); |
Kumar Gala | cb1ffb620 | 2009-06-19 03:30:42 -0500 | [diff] [blame] | 103 | |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 104 | pr_debug("waited %d msecs for CPU #%d.\n", n, nr); |
| 105 | } |
| 106 | |
| 107 | static void __init |
Kumar Gala | 563fdd4 | 2009-02-11 22:50:42 -0600 | [diff] [blame] | 108 | smp_85xx_setup_cpu(int cpu_nr) |
| 109 | { |
| 110 | mpic_setup_this_cpu(); |
Benjamin Herrenschmidt | b9f1cd7 | 2010-07-09 15:29:53 +1000 | [diff] [blame] | 111 | if (cpu_has_feature(CPU_FTR_DBELL)) |
| 112 | doorbell_setup_this_cpu(); |
Kumar Gala | 563fdd4 | 2009-02-11 22:50:42 -0600 | [diff] [blame] | 113 | } |
| 114 | |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 115 | struct smp_ops_t smp_85xx_ops = { |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 116 | .kick_cpu = smp_85xx_kick_cpu, |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 117 | #ifdef CONFIG_KEXEC |
| 118 | .give_timebase = smp_generic_give_timebase, |
| 119 | .take_timebase = smp_generic_take_timebase, |
| 120 | #endif |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 121 | }; |
| 122 | |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 123 | #ifdef CONFIG_KEXEC |
Matthew McClintock | 5d69296 | 2010-09-16 17:58:25 -0500 | [diff] [blame^] | 124 | atomic_t kexec_down_cpus = ATOMIC_INIT(0); |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 125 | |
| 126 | void mpc85xx_smp_kexec_cpu_down(int crash_shutdown, int secondary) |
| 127 | { |
Matthew McClintock | 5d69296 | 2010-09-16 17:58:25 -0500 | [diff] [blame^] | 128 | local_irq_disable(); |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 129 | |
Matthew McClintock | 5d69296 | 2010-09-16 17:58:25 -0500 | [diff] [blame^] | 130 | if (secondary) { |
| 131 | atomic_inc(&kexec_down_cpus); |
| 132 | /* loop forever */ |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 133 | while (1); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | static void mpc85xx_smp_kexec_down(void *arg) |
| 138 | { |
| 139 | if (ppc_md.kexec_cpu_down) |
| 140 | ppc_md.kexec_cpu_down(0,1); |
| 141 | } |
| 142 | |
| 143 | static void mpc85xx_smp_machine_kexec(struct kimage *image) |
| 144 | { |
Matthew McClintock | 5d69296 | 2010-09-16 17:58:25 -0500 | [diff] [blame^] | 145 | int timeout = INT_MAX; |
| 146 | int i, num_cpus = num_present_cpus(); |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 147 | |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 148 | |
Matthew McClintock | 5d69296 | 2010-09-16 17:58:25 -0500 | [diff] [blame^] | 149 | if (image->type == KEXEC_TYPE_DEFAULT) |
| 150 | smp_call_function(mpc85xx_smp_kexec_down, NULL, 0); |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 151 | |
Matthew McClintock | 5d69296 | 2010-09-16 17:58:25 -0500 | [diff] [blame^] | 152 | while ( (atomic_read(&kexec_down_cpus) != (num_cpus - 1)) && |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 153 | ( timeout > 0 ) ) |
| 154 | { |
| 155 | timeout--; |
| 156 | } |
| 157 | |
| 158 | if ( !timeout ) |
| 159 | printk(KERN_ERR "Unable to bring down secondary cpu(s)"); |
| 160 | |
Matthew McClintock | 5d69296 | 2010-09-16 17:58:25 -0500 | [diff] [blame^] | 161 | for (i = 0; i < num_cpus; i++) |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 162 | { |
| 163 | if ( i == smp_processor_id() ) continue; |
| 164 | mpic_reset_core(i); |
| 165 | } |
| 166 | |
| 167 | default_machine_kexec(image); |
| 168 | } |
| 169 | #endif /* CONFIG_KEXEC */ |
| 170 | |
Kumar Gala | 563fdd4 | 2009-02-11 22:50:42 -0600 | [diff] [blame] | 171 | void __init mpc85xx_smp_init(void) |
| 172 | { |
| 173 | struct device_node *np; |
| 174 | |
Kumar Gala | 563fdd4 | 2009-02-11 22:50:42 -0600 | [diff] [blame] | 175 | np = of_find_node_by_type(NULL, "open-pic"); |
| 176 | if (np) { |
| 177 | smp_85xx_ops.probe = smp_mpic_probe; |
| 178 | smp_85xx_ops.setup_cpu = smp_85xx_setup_cpu; |
| 179 | smp_85xx_ops.message_pass = smp_mpic_message_pass; |
Kumar Gala | 563fdd4 | 2009-02-11 22:50:42 -0600 | [diff] [blame] | 180 | } |
| 181 | |
| 182 | if (cpu_has_feature(CPU_FTR_DBELL)) |
Benjamin Herrenschmidt | b9f1cd7 | 2010-07-09 15:29:53 +1000 | [diff] [blame] | 183 | smp_85xx_ops.message_pass = doorbell_message_pass; |
Kumar Gala | 563fdd4 | 2009-02-11 22:50:42 -0600 | [diff] [blame] | 184 | |
| 185 | BUG_ON(!smp_85xx_ops.message_pass); |
| 186 | |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 187 | smp_ops = &smp_85xx_ops; |
Matthew McClintock | f933a41 | 2010-07-21 16:14:53 -0500 | [diff] [blame] | 188 | |
| 189 | #ifdef CONFIG_KEXEC |
| 190 | ppc_md.kexec_cpu_down = mpc85xx_smp_kexec_cpu_down; |
| 191 | ppc_md.machine_kexec = mpc85xx_smp_machine_kexec; |
| 192 | #endif |
Kumar Gala | d5b26db | 2008-11-19 09:35:56 -0600 | [diff] [blame] | 193 | } |