Ralf Baechle | 39b8d52 | 2008-04-28 17:14:26 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 MIPS Technologies, Inc. |
| 3 | * All rights reserved. |
| 4 | |
| 5 | * This program is free software; you can distribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License (Version 2) as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. |
| 17 | * |
| 18 | * Arbitrary Monitor interface |
| 19 | */ |
| 20 | |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/smp.h> |
| 24 | |
David Daney | 9e86786 | 2008-09-20 10:16:36 -0700 | [diff] [blame] | 25 | #include <asm/addrspace.h> |
| 26 | #include <asm/mips-boards/launch.h> |
| 27 | #include <asm/mipsmtregs.h> |
Ralf Baechle | 39b8d52 | 2008-04-28 17:14:26 +0100 | [diff] [blame] | 28 | |
| 29 | int amon_cpu_avail(int cpu) |
| 30 | { |
Thomas Bogendoerfer | 938b2b1 | 2008-05-29 22:05:07 +0200 | [diff] [blame] | 31 | struct cpulaunch *launch = (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH); |
Ralf Baechle | 39b8d52 | 2008-04-28 17:14:26 +0100 | [diff] [blame] | 32 | |
| 33 | if (cpu < 0 || cpu >= NCPULAUNCH) { |
| 34 | pr_debug("avail: cpu%d is out of range\n", cpu); |
| 35 | return 0; |
| 36 | } |
| 37 | |
| 38 | launch += cpu; |
| 39 | if (!(launch->flags & LAUNCH_FREADY)) { |
| 40 | pr_debug("avail: cpu%d is not ready\n", cpu); |
| 41 | return 0; |
| 42 | } |
| 43 | if (launch->flags & (LAUNCH_FGO|LAUNCH_FGONE)) { |
| 44 | pr_debug("avail: too late.. cpu%d is already gone\n", cpu); |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | return 1; |
| 49 | } |
| 50 | |
| 51 | void amon_cpu_start(int cpu, |
| 52 | unsigned long pc, unsigned long sp, |
| 53 | unsigned long gp, unsigned long a0) |
| 54 | { |
| 55 | volatile struct cpulaunch *launch = |
Thomas Bogendoerfer | 938b2b1 | 2008-05-29 22:05:07 +0200 | [diff] [blame] | 56 | (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH); |
Ralf Baechle | 39b8d52 | 2008-04-28 17:14:26 +0100 | [diff] [blame] | 57 | |
| 58 | if (!amon_cpu_avail(cpu)) |
| 59 | return; |
| 60 | if (cpu == smp_processor_id()) { |
| 61 | pr_debug("launch: I am cpu%d!\n", cpu); |
| 62 | return; |
| 63 | } |
| 64 | launch += cpu; |
| 65 | |
| 66 | pr_debug("launch: starting cpu%d\n", cpu); |
| 67 | |
| 68 | launch->pc = pc; |
| 69 | launch->gp = gp; |
| 70 | launch->sp = sp; |
| 71 | launch->a0 = a0; |
| 72 | |
Chris Dearman | 2ee0a42 | 2009-07-10 02:06:38 -0700 | [diff] [blame] | 73 | smp_wmb(); /* Target must see parameters before go */ |
Ralf Baechle | 39b8d52 | 2008-04-28 17:14:26 +0100 | [diff] [blame] | 74 | launch->flags |= LAUNCH_FGO; |
Chris Dearman | 2ee0a42 | 2009-07-10 02:06:38 -0700 | [diff] [blame] | 75 | smp_wmb(); /* Target must see go before we poll */ |
| 76 | |
Ralf Baechle | 39b8d52 | 2008-04-28 17:14:26 +0100 | [diff] [blame] | 77 | while ((launch->flags & LAUNCH_FGONE) == 0) |
| 78 | ; |
Chris Dearman | 2ee0a42 | 2009-07-10 02:06:38 -0700 | [diff] [blame] | 79 | smp_rmb(); /* Target will be updating flags soon */ |
Ralf Baechle | 39b8d52 | 2008-04-28 17:14:26 +0100 | [diff] [blame] | 80 | pr_debug("launch: cpu%d gone!\n", cpu); |
| 81 | } |