| Anoop P A | 088f387 | 2011-01-25 13:51:03 +0530 | [diff] [blame] | 1 | /* |
| 2 | * MSP71xx Platform-specific hooks for SMP operation |
| 3 | */ |
| 4 | #include <linux/irq.h> |
| 5 | #include <linux/init.h> |
| 6 | |
| 7 | #include <asm/mipsmtregs.h> |
| 8 | #include <asm/mipsregs.h> |
| 9 | #include <asm/smtc.h> |
| 10 | #include <asm/smtc_ipi.h> |
| 11 | |
| 12 | /* VPE/SMP Prototype implements platform interfaces directly */ |
| 13 | |
| 14 | /* |
| 15 | * Cause the specified action to be performed on a targeted "CPU" |
| 16 | */ |
| 17 | |
| 18 | static void msp_smtc_send_ipi_single(int cpu, unsigned int action) |
| 19 | { |
| 20 | /* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */ |
| 21 | smtc_send_ipi(cpu, LINUX_SMP_IPI, action); |
| 22 | } |
| 23 | |
| 24 | static void msp_smtc_send_ipi_mask(const struct cpumask *mask, |
| 25 | unsigned int action) |
| 26 | { |
| 27 | unsigned int i; |
| 28 | |
| 29 | for_each_cpu(i, mask) |
| 30 | msp_smtc_send_ipi_single(i, action); |
| 31 | } |
| 32 | |
| 33 | /* |
| 34 | * Post-config but pre-boot cleanup entry point |
| 35 | */ |
| 36 | static void __cpuinit msp_smtc_init_secondary(void) |
| 37 | { |
| 38 | int myvpe; |
| 39 | |
| 40 | /* Don't enable Malta I/O interrupts (IP2) for secondary VPEs */ |
| 41 | myvpe = read_c0_tcbind() & TCBIND_CURVPE; |
| 42 | if (myvpe > 0) |
| 43 | change_c0_status(ST0_IM, STATUSF_IP0 | STATUSF_IP1 | |
| 44 | STATUSF_IP6 | STATUSF_IP7); |
| 45 | smtc_init_secondary(); |
| 46 | } |
| 47 | |
| 48 | /* |
| 49 | * Platform "CPU" startup hook |
| 50 | */ |
| 51 | static void __cpuinit msp_smtc_boot_secondary(int cpu, |
| 52 | struct task_struct *idle) |
| 53 | { |
| 54 | smtc_boot_secondary(cpu, idle); |
| 55 | } |
| 56 | |
| 57 | /* |
| 58 | * SMP initialization finalization entry point |
| 59 | */ |
| 60 | static void __cpuinit msp_smtc_smp_finish(void) |
| 61 | { |
| 62 | smtc_smp_finish(); |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | * Hook for after all CPUs are online |
| 67 | */ |
| 68 | |
| 69 | static void msp_smtc_cpus_done(void) |
| 70 | { |
| 71 | } |
| 72 | |
| 73 | /* |
| 74 | * Platform SMP pre-initialization |
| 75 | * |
| 76 | * As noted above, we can assume a single CPU for now |
| 77 | * but it may be multithreaded. |
| 78 | */ |
| 79 | |
| 80 | static void __init msp_smtc_smp_setup(void) |
| 81 | { |
| 82 | /* |
| 83 | * we won't get the definitive value until |
| 84 | * we've run smtc_prepare_cpus later, but |
| 85 | */ |
| 86 | |
| 87 | if (read_c0_config3() & (1 << 2)) |
| 88 | smp_num_siblings = smtc_build_cpu_map(0); |
| 89 | } |
| 90 | |
| 91 | static void __init msp_smtc_prepare_cpus(unsigned int max_cpus) |
| 92 | { |
| 93 | smtc_prepare_cpus(max_cpus); |
| 94 | } |
| 95 | |
| 96 | struct plat_smp_ops msp_smtc_smp_ops = { |
| 97 | .send_ipi_single = msp_smtc_send_ipi_single, |
| 98 | .send_ipi_mask = msp_smtc_send_ipi_mask, |
| 99 | .init_secondary = msp_smtc_init_secondary, |
| 100 | .smp_finish = msp_smtc_smp_finish, |
| 101 | .cpus_done = msp_smtc_cpus_done, |
| 102 | .boot_secondary = msp_smtc_boot_secondary, |
| 103 | .smp_setup = msp_smtc_smp_setup, |
| 104 | .prepare_cpus = msp_smtc_prepare_cpus, |
| 105 | }; |