| Magnus Damm | bd5a875 | 2012-05-16 15:45:25 +0900 | [diff] [blame] | 1 | /* |
| 2 | * SMP support for Emma Mobile EV2 |
| 3 | * |
| 4 | * Copyright (C) 2012 Renesas Solutions Corp. |
| 5 | * Copyright (C) 2012 Magnus Damm |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; version 2 of the License. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/smp.h> |
| 23 | #include <linux/spinlock.h> |
| 24 | #include <linux/io.h> |
| 25 | #include <linux/delay.h> |
| 26 | #include <mach/common.h> |
| 27 | #include <mach/emev2.h> |
| 28 | #include <asm/smp_plat.h> |
| 29 | #include <asm/smp_scu.h> |
| 30 | #include <asm/hardware/gic.h> |
| 31 | #include <asm/cacheflush.h> |
| 32 | |
| 33 | #define EMEV2_SCU_BASE 0x1e000000 |
| 34 | |
| 35 | static DEFINE_SPINLOCK(scu_lock); |
| 36 | static void __iomem *scu_base; |
| 37 | |
| 38 | static void modify_scu_cpu_psr(unsigned long set, unsigned long clr) |
| 39 | { |
| 40 | unsigned long tmp; |
| 41 | |
| 42 | /* we assume this code is running on a different cpu |
| 43 | * than the one that is changing coherency setting */ |
| 44 | spin_lock(&scu_lock); |
| 45 | tmp = readl(scu_base + 8); |
| 46 | tmp &= ~clr; |
| 47 | tmp |= set; |
| 48 | writel(tmp, scu_base + 8); |
| 49 | spin_unlock(&scu_lock); |
| 50 | |
| 51 | } |
| 52 | |
| 53 | unsigned int __init emev2_get_core_count(void) |
| 54 | { |
| 55 | if (!scu_base) { |
| 56 | scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE); |
| 57 | emev2_clock_init(); /* need ioremapped SMU */ |
| 58 | } |
| 59 | |
| 60 | WARN_ON_ONCE(!scu_base); |
| 61 | |
| 62 | return scu_base ? scu_get_core_count(scu_base) : 1; |
| 63 | } |
| 64 | |
| 65 | int emev2_platform_cpu_kill(unsigned int cpu) |
| 66 | { |
| 67 | return 0; /* not supported yet */ |
| 68 | } |
| 69 | |
| 70 | void __cpuinit emev2_secondary_init(unsigned int cpu) |
| 71 | { |
| 72 | gic_secondary_init(0); |
| 73 | } |
| 74 | |
| 75 | int __cpuinit emev2_boot_secondary(unsigned int cpu) |
| 76 | { |
| 77 | cpu = cpu_logical_map(cpu); |
| 78 | |
| 79 | /* enable cache coherency */ |
| 80 | modify_scu_cpu_psr(0, 3 << (cpu * 8)); |
| 81 | |
| 82 | /* Tell ROM loader about our vector (in headsmp.S) */ |
| 83 | emev2_set_boot_vector(__pa(shmobile_secondary_vector)); |
| 84 | |
| 85 | gic_raise_softirq(cpumask_of(cpu), 1); |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | void __init emev2_smp_prepare_cpus(void) |
| 90 | { |
| 91 | int cpu = cpu_logical_map(0); |
| 92 | |
| 93 | scu_enable(scu_base); |
| 94 | |
| 95 | /* enable cache coherency on CPU0 */ |
| 96 | modify_scu_cpu_psr(0, 3 << (cpu * 8)); |
| 97 | } |