Andrew Isaacson | f137e46 | 2005-10-19 23:56:38 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2001,2002,2004 Broadcom Corporation |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version 2 |
| 7 | * of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/smp.h> |
| 22 | #include <linux/kernel_stat.h> |
| 23 | |
| 24 | #include <asm/mmu_context.h> |
| 25 | #include <asm/io.h> |
Ralf Baechle | 87353d8 | 2007-11-19 12:23:51 +0000 | [diff] [blame] | 26 | #include <asm/fw/cfe/cfe_api.h> |
Andrew Isaacson | f137e46 | 2005-10-19 23:56:38 -0700 | [diff] [blame] | 27 | #include <asm/sibyte/sb1250.h> |
| 28 | #include <asm/sibyte/bcm1480_regs.h> |
| 29 | #include <asm/sibyte/bcm1480_int.h> |
| 30 | |
| 31 | extern void smp_call_function_interrupt(void); |
| 32 | |
| 33 | /* |
| 34 | * These are routines for dealing with the bcm1480 smp capabilities |
| 35 | * independent of board/firmware |
| 36 | */ |
| 37 | |
Ralf Baechle | 8fb303c | 2007-03-24 14:26:13 +0000 | [diff] [blame] | 38 | static void *mailbox_0_set_regs[] = { |
Andrew Isaacson | f137e46 | 2005-10-19 23:56:38 -0700 | [diff] [blame] | 39 | IOADDR(A_BCM1480_IMR_CPU0_BASE + R_BCM1480_IMR_MAILBOX_0_SET_CPU), |
| 40 | IOADDR(A_BCM1480_IMR_CPU1_BASE + R_BCM1480_IMR_MAILBOX_0_SET_CPU), |
| 41 | IOADDR(A_BCM1480_IMR_CPU2_BASE + R_BCM1480_IMR_MAILBOX_0_SET_CPU), |
| 42 | IOADDR(A_BCM1480_IMR_CPU3_BASE + R_BCM1480_IMR_MAILBOX_0_SET_CPU), |
| 43 | }; |
| 44 | |
Ralf Baechle | 8fb303c | 2007-03-24 14:26:13 +0000 | [diff] [blame] | 45 | static void *mailbox_0_clear_regs[] = { |
Andrew Isaacson | f137e46 | 2005-10-19 23:56:38 -0700 | [diff] [blame] | 46 | IOADDR(A_BCM1480_IMR_CPU0_BASE + R_BCM1480_IMR_MAILBOX_0_CLR_CPU), |
| 47 | IOADDR(A_BCM1480_IMR_CPU1_BASE + R_BCM1480_IMR_MAILBOX_0_CLR_CPU), |
| 48 | IOADDR(A_BCM1480_IMR_CPU2_BASE + R_BCM1480_IMR_MAILBOX_0_CLR_CPU), |
| 49 | IOADDR(A_BCM1480_IMR_CPU3_BASE + R_BCM1480_IMR_MAILBOX_0_CLR_CPU), |
| 50 | }; |
| 51 | |
Ralf Baechle | 8fb303c | 2007-03-24 14:26:13 +0000 | [diff] [blame] | 52 | static void *mailbox_0_regs[] = { |
Andrew Isaacson | f137e46 | 2005-10-19 23:56:38 -0700 | [diff] [blame] | 53 | IOADDR(A_BCM1480_IMR_CPU0_BASE + R_BCM1480_IMR_MAILBOX_0_CPU), |
| 54 | IOADDR(A_BCM1480_IMR_CPU1_BASE + R_BCM1480_IMR_MAILBOX_0_CPU), |
| 55 | IOADDR(A_BCM1480_IMR_CPU2_BASE + R_BCM1480_IMR_MAILBOX_0_CPU), |
| 56 | IOADDR(A_BCM1480_IMR_CPU3_BASE + R_BCM1480_IMR_MAILBOX_0_CPU), |
| 57 | }; |
| 58 | |
| 59 | /* |
| 60 | * SMP init and finish on secondary CPUs |
| 61 | */ |
Ralf Baechle | d045336 | 2007-10-22 10:38:44 +0100 | [diff] [blame] | 62 | void __cpuinit bcm1480_smp_init(void) |
Andrew Isaacson | f137e46 | 2005-10-19 23:56:38 -0700 | [diff] [blame] | 63 | { |
| 64 | unsigned int imask = STATUSF_IP4 | STATUSF_IP3 | STATUSF_IP2 | |
| 65 | STATUSF_IP1 | STATUSF_IP0; |
| 66 | |
| 67 | /* Set interrupt mask, but don't enable */ |
| 68 | change_c0_status(ST0_IM, imask); |
| 69 | } |
| 70 | |
Andrew Isaacson | f137e46 | 2005-10-19 23:56:38 -0700 | [diff] [blame] | 71 | /* |
| 72 | * These are routines for dealing with the sb1250 smp capabilities |
| 73 | * independent of board/firmware |
| 74 | */ |
| 75 | |
| 76 | /* |
| 77 | * Simple enough; everything is set up, so just poke the appropriate mailbox |
| 78 | * register, and we should be set |
| 79 | */ |
Ralf Baechle | 87353d8 | 2007-11-19 12:23:51 +0000 | [diff] [blame] | 80 | static void bcm1480_send_ipi_single(int cpu, unsigned int action) |
Andrew Isaacson | f137e46 | 2005-10-19 23:56:38 -0700 | [diff] [blame] | 81 | { |
| 82 | __raw_writeq((((u64)action)<< 48), mailbox_0_set_regs[cpu]); |
| 83 | } |
| 84 | |
Ralf Baechle | 87353d8 | 2007-11-19 12:23:51 +0000 | [diff] [blame] | 85 | static void bcm1480_send_ipi_mask(cpumask_t mask, unsigned int action) |
| 86 | { |
| 87 | unsigned int i; |
| 88 | |
| 89 | for_each_cpu_mask(i, mask) |
| 90 | bcm1480_send_ipi_single(i, action); |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Code to run on secondary just after probing the CPU |
| 95 | */ |
| 96 | static void __cpuinit bcm1480_init_secondary(void) |
| 97 | { |
| 98 | extern void bcm1480_smp_init(void); |
| 99 | |
| 100 | bcm1480_smp_init(); |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Do any tidying up before marking online and running the idle |
| 105 | * loop |
| 106 | */ |
| 107 | static void __cpuinit bcm1480_smp_finish(void) |
| 108 | { |
| 109 | extern void sb1480_clockevent_init(void); |
| 110 | |
| 111 | sb1480_clockevent_init(); |
| 112 | local_irq_enable(); |
| 113 | bcm1480_smp_finish(); |
| 114 | } |
| 115 | |
| 116 | /* |
| 117 | * Final cleanup after all secondaries booted |
| 118 | */ |
| 119 | static void bcm1480_cpus_done(void) |
| 120 | { |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * Setup the PC, SP, and GP of a secondary processor and start it |
| 125 | * running! |
| 126 | */ |
| 127 | static void __cpuinit bcm1480_boot_secondary(int cpu, struct task_struct *idle) |
| 128 | { |
| 129 | int retval; |
| 130 | |
| 131 | retval = cfe_cpu_start(cpu_logical_map(cpu), &smp_bootstrap, |
| 132 | __KSTK_TOS(idle), |
| 133 | (unsigned long)task_thread_info(idle), 0); |
| 134 | if (retval != 0) |
| 135 | printk("cfe_start_cpu(%i) returned %i\n" , cpu, retval); |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * Use CFE to find out how many CPUs are available, setting up |
| 140 | * phys_cpu_present_map and the logical/physical mappings. |
| 141 | * XXXKW will the boot CPU ever not be physical 0? |
| 142 | * |
| 143 | * Common setup before any secondaries are started |
| 144 | */ |
| 145 | static void __init bcm1480_smp_setup(void) |
| 146 | { |
| 147 | int i, num; |
| 148 | |
| 149 | cpus_clear(phys_cpu_present_map); |
| 150 | cpu_set(0, phys_cpu_present_map); |
| 151 | __cpu_number_map[0] = 0; |
| 152 | __cpu_logical_map[0] = 0; |
| 153 | |
| 154 | for (i = 1, num = 0; i < NR_CPUS; i++) { |
| 155 | if (cfe_cpu_stop(i) == 0) { |
| 156 | cpu_set(i, phys_cpu_present_map); |
| 157 | __cpu_number_map[i] = ++num; |
| 158 | __cpu_logical_map[num] = i; |
| 159 | } |
| 160 | } |
| 161 | printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num); |
| 162 | } |
| 163 | |
| 164 | static void __init bcm1480_prepare_cpus(unsigned int max_cpus) |
| 165 | { |
| 166 | } |
| 167 | |
| 168 | struct plat_smp_ops bcm1480_smp_ops = { |
| 169 | .send_ipi_single = bcm1480_send_ipi_single, |
| 170 | .send_ipi_mask = bcm1480_send_ipi_mask, |
| 171 | .init_secondary = bcm1480_init_secondary, |
| 172 | .smp_finish = bcm1480_smp_finish, |
| 173 | .cpus_done = bcm1480_cpus_done, |
| 174 | .boot_secondary = bcm1480_boot_secondary, |
| 175 | .smp_setup = bcm1480_smp_setup, |
| 176 | .prepare_cpus = bcm1480_prepare_cpus, |
| 177 | }; |
| 178 | |
Ralf Baechle | 937a801 | 2006-10-07 19:44:33 +0100 | [diff] [blame] | 179 | void bcm1480_mailbox_interrupt(void) |
Andrew Isaacson | f137e46 | 2005-10-19 23:56:38 -0700 | [diff] [blame] | 180 | { |
| 181 | int cpu = smp_processor_id(); |
| 182 | unsigned int action; |
| 183 | |
| 184 | kstat_this_cpu.irqs[K_BCM1480_INT_MBOX_0_0]++; |
| 185 | /* Load the mailbox register to figure out what we're supposed to do */ |
| 186 | action = (__raw_readq(mailbox_0_regs[cpu]) >> 48) & 0xffff; |
| 187 | |
| 188 | /* Clear the mailbox to clear the interrupt */ |
| 189 | __raw_writeq(((u64)action)<<48, mailbox_0_clear_regs[cpu]); |
| 190 | |
| 191 | /* |
| 192 | * Nothing to do for SMP_RESCHEDULE_YOURSELF; returning from the |
| 193 | * interrupt will do the reschedule for us |
| 194 | */ |
| 195 | |
| 196 | if (action & SMP_CALL_FUNCTION) |
| 197 | smp_call_function_interrupt(); |
| 198 | } |