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f137e463 AI |
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> | |
26 | #include <asm/sibyte/sb1250.h> | |
27 | #include <asm/sibyte/bcm1480_regs.h> | |
28 | #include <asm/sibyte/bcm1480_int.h> | |
29 | ||
30 | extern void smp_call_function_interrupt(void); | |
31 | ||
32 | /* | |
33 | * These are routines for dealing with the bcm1480 smp capabilities | |
34 | * independent of board/firmware | |
35 | */ | |
36 | ||
37 | static void *mailbox_0_set_regs[] = { | |
38 | IOADDR(A_BCM1480_IMR_CPU0_BASE + R_BCM1480_IMR_MAILBOX_0_SET_CPU), | |
39 | IOADDR(A_BCM1480_IMR_CPU1_BASE + R_BCM1480_IMR_MAILBOX_0_SET_CPU), | |
40 | IOADDR(A_BCM1480_IMR_CPU2_BASE + R_BCM1480_IMR_MAILBOX_0_SET_CPU), | |
41 | IOADDR(A_BCM1480_IMR_CPU3_BASE + R_BCM1480_IMR_MAILBOX_0_SET_CPU), | |
42 | }; | |
43 | ||
44 | static void *mailbox_0_clear_regs[] = { | |
45 | IOADDR(A_BCM1480_IMR_CPU0_BASE + R_BCM1480_IMR_MAILBOX_0_CLR_CPU), | |
46 | IOADDR(A_BCM1480_IMR_CPU1_BASE + R_BCM1480_IMR_MAILBOX_0_CLR_CPU), | |
47 | IOADDR(A_BCM1480_IMR_CPU2_BASE + R_BCM1480_IMR_MAILBOX_0_CLR_CPU), | |
48 | IOADDR(A_BCM1480_IMR_CPU3_BASE + R_BCM1480_IMR_MAILBOX_0_CLR_CPU), | |
49 | }; | |
50 | ||
51 | static void *mailbox_0_regs[] = { | |
52 | IOADDR(A_BCM1480_IMR_CPU0_BASE + R_BCM1480_IMR_MAILBOX_0_CPU), | |
53 | IOADDR(A_BCM1480_IMR_CPU1_BASE + R_BCM1480_IMR_MAILBOX_0_CPU), | |
54 | IOADDR(A_BCM1480_IMR_CPU2_BASE + R_BCM1480_IMR_MAILBOX_0_CPU), | |
55 | IOADDR(A_BCM1480_IMR_CPU3_BASE + R_BCM1480_IMR_MAILBOX_0_CPU), | |
56 | }; | |
57 | ||
58 | /* | |
59 | * SMP init and finish on secondary CPUs | |
60 | */ | |
61 | void bcm1480_smp_init(void) | |
62 | { | |
63 | unsigned int imask = STATUSF_IP4 | STATUSF_IP3 | STATUSF_IP2 | | |
64 | STATUSF_IP1 | STATUSF_IP0; | |
65 | ||
66 | /* Set interrupt mask, but don't enable */ | |
67 | change_c0_status(ST0_IM, imask); | |
68 | } | |
69 | ||
70 | void bcm1480_smp_finish(void) | |
71 | { | |
72 | extern void bcm1480_time_init(void); | |
73 | bcm1480_time_init(); | |
74 | local_irq_enable(); | |
75 | } | |
76 | ||
77 | /* | |
78 | * These are routines for dealing with the sb1250 smp capabilities | |
79 | * independent of board/firmware | |
80 | */ | |
81 | ||
82 | /* | |
83 | * Simple enough; everything is set up, so just poke the appropriate mailbox | |
84 | * register, and we should be set | |
85 | */ | |
86 | void core_send_ipi(int cpu, unsigned int action) | |
87 | { | |
88 | __raw_writeq((((u64)action)<< 48), mailbox_0_set_regs[cpu]); | |
89 | } | |
90 | ||
91 | void bcm1480_mailbox_interrupt(struct pt_regs *regs) | |
92 | { | |
93 | int cpu = smp_processor_id(); | |
94 | unsigned int action; | |
95 | ||
96 | kstat_this_cpu.irqs[K_BCM1480_INT_MBOX_0_0]++; | |
97 | /* Load the mailbox register to figure out what we're supposed to do */ | |
98 | action = (__raw_readq(mailbox_0_regs[cpu]) >> 48) & 0xffff; | |
99 | ||
100 | /* Clear the mailbox to clear the interrupt */ | |
101 | __raw_writeq(((u64)action)<<48, mailbox_0_clear_regs[cpu]); | |
102 | ||
103 | /* | |
104 | * Nothing to do for SMP_RESCHEDULE_YOURSELF; returning from the | |
105 | * interrupt will do the reschedule for us | |
106 | */ | |
107 | ||
108 | if (action & SMP_CALL_FUNCTION) | |
109 | smp_call_function_interrupt(); | |
110 | } |