projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1a442fe0 PM |
1 | /* |
| 2 | * SH-X3 SMP | |
| 3 | * | |
| c7936b9a | 4 | * Copyright (C) 2007 - 2008 Paul Mundt |
| 1a442fe0 PM |
5 | * Copyright (C) 2007 Magnus Damm |
| 6 | * | |
| 7 | * This file is subject to the terms and conditions of the GNU General Public | |
| 8 | * License. See the file "COPYING" in the main directory of this archive | |
| 9 | * for more details. | |
| 10 | */ | |
| 11 | #include <linux/init.h> | |
| 12 | #include <linux/cpumask.h> | |
| 13 | #include <linux/smp.h> | |
| 14 | #include <linux/interrupt.h> | |
| 15 | #include <linux/io.h> | |
| 16 | ||
| c7936b9a PM |
17 | static irqreturn_t ipi_interrupt_handler(int irq, void *arg) |
| 18 | { | |
| 19 | unsigned int message = (unsigned int)(long)arg; | |
| 20 | unsigned int cpu = hard_smp_processor_id(); | |
| 21 | unsigned int offs = 4 * cpu; | |
| 22 | unsigned int x; | |
| 23 | ||
| 24 | x = ctrl_inl(0xfe410070 + offs); /* C0INITICI..CnINTICI */ | |
| 25 | x &= (1 << (message << 2)); | |
| 26 | ctrl_outl(x, 0xfe410080 + offs); /* C0INTICICLR..CnINTICICLR */ | |
| 27 | ||
| 28 | smp_message_recv(message); | |
| 29 | ||
| 30 | return IRQ_HANDLED; | |
| 31 | } | |
| 32 | ||
| 1a442fe0 PM |
33 | void __init plat_smp_setup(void) |
| 34 | { | |
| 35 | unsigned int cpu = 0; | |
| 36 | int i, num; | |
| 37 | ||
| e09377ba | 38 | init_cpu_possible(cpumask_of(cpu)); |
| 1a442fe0 PM |
39 | |
| 40 | __cpu_number_map[0] = 0; | |
| 41 | __cpu_logical_map[0] = 0; | |
| 42 | ||
| 43 | /* | |
| 44 | * Do this stupidly for now.. we don't have an easy way to probe | |
| 45 | * for the total number of cores. | |
| 46 | */ | |
| 47 | for (i = 1, num = 0; i < NR_CPUS; i++) { | |
| e09377ba | 48 | set_cpu_possible(i, true); |
| 1a442fe0 PM |
49 | __cpu_number_map[i] = ++num; |
| 50 | __cpu_logical_map[num] = i; | |
| 51 | } | |
| 52 | ||
| 53 | printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num); | |
| 54 | } | |
| 55 | ||
| 56 | void __init plat_prepare_cpus(unsigned int max_cpus) | |
| 57 | { | |
| c7936b9a PM |
58 | int i; |
| 59 | ||
| fc6191dd PM |
60 | local_timer_setup(0); |
| 61 | ||
| c7936b9a PM |
62 | BUILD_BUG_ON(SMP_MSG_NR >= 8); |
| 63 | ||
| 64 | for (i = 0; i < SMP_MSG_NR; i++) | |
| 65 | request_irq(104 + i, ipi_interrupt_handler, IRQF_DISABLED, | |
| 66 | "IPI", (void *)(long)i); | |
| 1a442fe0 PM |
67 | } |
| 68 | ||
| 69 | #define STBCR_REG(phys_id) (0xfe400004 | (phys_id << 12)) | |
| 70 | #define RESET_REG(phys_id) (0xfe400008 | (phys_id << 12)) | |
| 71 | ||
| 72 | #define STBCR_MSTP 0x00000001 | |
| 73 | #define STBCR_RESET 0x00000002 | |
| 74 | #define STBCR_LTSLP 0x80000000 | |
| 75 | ||
| 76 | #define STBCR_AP_VAL (STBCR_RESET | STBCR_LTSLP) | |
| 77 | ||
| 78 | void plat_start_cpu(unsigned int cpu, unsigned long entry_point) | |
| 79 | { | |
| 80 | ctrl_outl(entry_point, RESET_REG(cpu)); | |
| 81 | ||
| 82 | if (!(ctrl_inl(STBCR_REG(cpu)) & STBCR_MSTP)) | |
| 83 | ctrl_outl(STBCR_MSTP, STBCR_REG(cpu)); | |
| 84 | ||
| 85 | while (!(ctrl_inl(STBCR_REG(cpu)) & STBCR_MSTP)) | |
| 71f0bdca | 86 | cpu_relax(); |
| 1a442fe0 PM |
87 | |
| 88 | /* Start up secondary processor by sending a reset */ | |
| 89 | ctrl_outl(STBCR_AP_VAL, STBCR_REG(cpu)); | |
| 90 | } | |
| 91 | ||
| 92 | int plat_smp_processor_id(void) | |
| 93 | { | |
| 94 | return ctrl_inl(0xff000048); /* CPIDR */ | |
| 95 | } | |
| 96 | ||
| 97 | void plat_send_ipi(unsigned int cpu, unsigned int message) | |
| 98 | { | |
| 99 | unsigned long addr = 0xfe410070 + (cpu * 4); | |
| 100 | ||
| 101 | BUG_ON(cpu >= 4); | |
| 1a442fe0 PM |
102 | |
| 103 | ctrl_outl(1 << (message << 2), addr); /* C0INTICI..CnINTICI */ | |
| 104 | } |