2 * Copyright (C) 2001,2002,2004 Broadcom Corporation
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.
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.
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.
19 #include <linux/init.h>
20 #include <linux/delay.h>
21 #include <linux/smp.h>
22 #include <linux/kernel_stat.h>
24 #include <asm/mmu_context.h>
26 #include <asm/fw/cfe/cfe_api.h>
27 #include <asm/sibyte/sb1250.h>
28 #include <asm/sibyte/bcm1480_regs.h>
29 #include <asm/sibyte/bcm1480_int.h>
31 extern void smp_call_function_interrupt(void);
34 * These are routines for dealing with the bcm1480 smp capabilities
35 * independent of board/firmware
38 static void *mailbox_0_set_regs[] = {
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),
45 static void *mailbox_0_clear_regs[] = {
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),
52 static void *mailbox_0_regs[] = {
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),
60 * SMP init and finish on secondary CPUs
62 void __cpuinit bcm1480_smp_init(void)
64 unsigned int imask = STATUSF_IP4 | STATUSF_IP3 | STATUSF_IP2 |
65 STATUSF_IP1 | STATUSF_IP0;
67 /* Set interrupt mask, but don't enable */
68 change_c0_status(ST0_IM, imask);
72 * These are routines for dealing with the sb1250 smp capabilities
73 * independent of board/firmware
77 * Simple enough; everything is set up, so just poke the appropriate mailbox
78 * register, and we should be set
80 static void bcm1480_send_ipi_single(int cpu, unsigned int action)
82 __raw_writeq((((u64)action)<< 48), mailbox_0_set_regs[cpu]);
85 static void bcm1480_send_ipi_mask(cpumask_t mask, unsigned int action)
89 for_each_cpu_mask(i, mask)
90 bcm1480_send_ipi_single(i, action);
94 * Code to run on secondary just after probing the CPU
96 static void __cpuinit bcm1480_init_secondary(void)
98 extern void bcm1480_smp_init(void);
104 * Do any tidying up before marking online and running the idle
107 static void __cpuinit bcm1480_smp_finish(void)
109 extern void sb1480_clockevent_init(void);
111 sb1480_clockevent_init();
116 * Final cleanup after all secondaries booted
118 static void bcm1480_cpus_done(void)
123 * Setup the PC, SP, and GP of a secondary processor and start it
126 static void __cpuinit bcm1480_boot_secondary(int cpu, struct task_struct *idle)
130 retval = cfe_cpu_start(cpu_logical_map(cpu), &smp_bootstrap,
132 (unsigned long)task_thread_info(idle), 0);
134 printk("cfe_start_cpu(%i) returned %i\n" , cpu, retval);
138 * Use CFE to find out how many CPUs are available, setting up
139 * cpu_possible_map and the logical/physical mappings.
140 * XXXKW will the boot CPU ever not be physical 0?
142 * Common setup before any secondaries are started
144 static void __init bcm1480_smp_setup(void)
148 cpus_clear(cpu_possible_map);
149 cpu_set(0, cpu_possible_map);
150 __cpu_number_map[0] = 0;
151 __cpu_logical_map[0] = 0;
153 for (i = 1, num = 0; i < NR_CPUS; i++) {
154 if (cfe_cpu_stop(i) == 0) {
155 cpu_set(i, cpu_possible_map);
156 __cpu_number_map[i] = ++num;
157 __cpu_logical_map[num] = i;
160 printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num);
163 static void __init bcm1480_prepare_cpus(unsigned int max_cpus)
167 struct plat_smp_ops bcm1480_smp_ops = {
168 .send_ipi_single = bcm1480_send_ipi_single,
169 .send_ipi_mask = bcm1480_send_ipi_mask,
170 .init_secondary = bcm1480_init_secondary,
171 .smp_finish = bcm1480_smp_finish,
172 .cpus_done = bcm1480_cpus_done,
173 .boot_secondary = bcm1480_boot_secondary,
174 .smp_setup = bcm1480_smp_setup,
175 .prepare_cpus = bcm1480_prepare_cpus,
178 void bcm1480_mailbox_interrupt(void)
180 int cpu = smp_processor_id();
183 kstat_this_cpu.irqs[K_BCM1480_INT_MBOX_0_0]++;
184 /* Load the mailbox register to figure out what we're supposed to do */
185 action = (__raw_readq(mailbox_0_regs[cpu]) >> 48) & 0xffff;
187 /* Clear the mailbox to clear the interrupt */
188 __raw_writeq(((u64)action)<<48, mailbox_0_clear_regs[cpu]);
191 * Nothing to do for SMP_RESCHEDULE_YOURSELF; returning from the
192 * interrupt will do the reschedule for us
195 if (action & SMP_CALL_FUNCTION)
196 smp_call_function_interrupt();