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| author | Gustavo Padovan <gustavo.padovan@collabora.co.uk> | 2013-09-27 11:56:14 -0300 |
|---|---|---|
| committer | Gustavo Padovan <gustavo.padovan@collabora.co.uk> | 2013-09-27 11:56:14 -0300 |
| commit | 1025c04cecd19882e28f16c4004034b475c372c5 (patch) | |
| tree | 2b7402887e86d54bff5a123228c9059eae5e32bd /arch/powerpc/platforms/85xx/smp.c | |
| parent | 4375f1037d52602413142e290608d0d84671ad36 (diff) | |
| parent | 5bcecf325378218a8e248bb6bcae96ec7362f8ef (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth
Conflicts:
net/bluetooth/hci_core.c
Diffstat (limited to 'arch/powerpc/platforms/85xx/smp.c')
| -rw-r--r-- | arch/powerpc/platforms/85xx/smp.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c index 5ced4f5bb2b..281b7f01df6 100644 --- a/arch/powerpc/platforms/85xx/smp.c +++ b/arch/powerpc/platforms/85xx/smp.c @@ -69,7 +69,32 @@ static void mpc85xx_give_timebase(void) tb_req = 0; mpc85xx_timebase_freeze(1); +#ifdef CONFIG_PPC64 + /* + * e5500/e6500 have a workaround for erratum A-006958 in place + * that will reread the timebase until TBL is non-zero. + * That would be a bad thing when the timebase is frozen. + * + * Thus, we read it manually, and instead of checking that + * TBL is non-zero, we ensure that TB does not change. We don't + * do that for the main mftb implementation, because it requires + * a scratch register + */ + { + u64 prev; + + asm volatile("mfspr %0, %1" : "=r" (timebase) : + "i" (SPRN_TBRL)); + + do { + prev = timebase; + asm volatile("mfspr %0, %1" : "=r" (timebase) : + "i" (SPRN_TBRL)); + } while (prev != timebase); + } +#else timebase = get_tb(); +#endif mb(); tb_valid = 1; @@ -255,6 +280,7 @@ out: struct smp_ops_t smp_85xx_ops = { .kick_cpu = smp_85xx_kick_cpu, + .cpu_bootable = smp_generic_cpu_bootable, #ifdef CONFIG_HOTPLUG_CPU .cpu_disable = generic_cpu_disable, .cpu_die = generic_cpu_die, |