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ARM: OMAP4+: Reset CPU1 properly for kexec

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We need to reset CPU1 properly for kexec when booting different
kernel versions. Otherwise CPU1 will attempt to boot the the
previous kernel's start_secondary(). Note that the restctrl
register is different from the low-power mode wakeup register
CPU1_WAKEUP_NS_PA_ADDR. We need to configure both.

Let's fix the issue by defining SoC specific data to initialize
things in a more generic way. And let's also standardize omap-smp.c
to use soc_is instead of cpu_is while at it.

Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Tested-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2016-06-22 01:59:40 -07:00
parent 0573b957fc
commit 3251885285
1 changed files with 70 additions and 26 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

96
arch/arm/mach-omap2/omap-smp.c
View file

@ -40,14 +40,35 @@
#define OMAP5_CORE_COUNT 0x2
/* SCU base address */
static void __iomem *scu_base;
struct omap_smp_config {
unsigned long cpu1_rstctrl_pa;
void __iomem *cpu1_rstctrl_va;
void __iomem *scu_base;
void *startup_addr;
};
static struct omap_smp_config cfg;
static const struct omap_smp_config omap443x_cfg __initconst = {
.cpu1_rstctrl_pa = 0x4824380c,
.startup_addr = omap4_secondary_startup,
};
static const struct omap_smp_config omap446x_cfg __initconst = {
.cpu1_rstctrl_pa = 0x4824380c,
.startup_addr = omap4460_secondary_startup,
};
static const struct omap_smp_config omap5_cfg __initconst = {
.cpu1_rstctrl_pa = 0x48243810,
.startup_addr = omap5_secondary_startup,
};
static DEFINE_SPINLOCK(boot_lock);
void __iomem *omap4_get_scu_base(void)
{
return scu_base;
return cfg.scu_base;
}
#ifdef CONFIG_OMAP5_ERRATA_801819
@ -93,7 +114,7 @@ static void omap4_secondary_init(unsigned int cpu)
* OMAP443X GP devices- SMP bit isn't accessible.
* OMAP446X GP devices - SMP bit access is enabled on both CPUs.
*/
if (cpu_is_omap443x() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
if (soc_is_omap443x() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
omap_secure_dispatcher(OMAP4_PPA_CPU_ACTRL_SMP_INDEX,
4, 0, 0, 0, 0, 0);
@ -222,9 +243,9 @@ static void __init omap4_smp_init_cpus(void)
* Currently we can't call ioremap here because
* SoC detection won't work until after init_early.
*/
scu_base = OMAP2_L4_IO_ADDRESS(scu_a9_get_base());
BUG_ON(!scu_base);
ncores = scu_get_core_count(scu_base);
cfg.scu_base = OMAP2_L4_IO_ADDRESS(scu_a9_get_base());
BUG_ON(!cfg.scu_base);
ncores = scu_get_core_count(cfg.scu_base);
} else if (cpu_id == CPU_CORTEX_A15) {
ncores = OMAP5_CORE_COUNT;
}
@ -242,20 +263,51 @@ static void __init omap4_smp_init_cpus(void)
static void __init omap4_smp_prepare_cpus(unsigned int max_cpus)
{
void *startup_addr = omap4_secondary_startup;
void __iomem *base = omap_get_wakeupgen_base();
const struct omap_smp_config *c = NULL;
if (soc_is_omap443x())
c = &omap443x_cfg;
else if (soc_is_omap446x())
c = &omap446x_cfg;
else if (soc_is_dra74x() || soc_is_omap54xx())
c = &omap5_cfg;
if (!c) {
pr_err("%s Unknown SMP SoC?\n", __func__);
return;
}
/* Must preserve cfg.scu_base set earlier */
cfg.cpu1_rstctrl_pa = c->cpu1_rstctrl_pa;
cfg.startup_addr = c->startup_addr;
if (soc_is_dra74x() || soc_is_omap54xx()) {
if ((__boot_cpu_mode & MODE_MASK) == HYP_MODE)
cfg.startup_addr = omap5_secondary_hyp_startup;
omap5_erratum_workaround_801819();
}
cfg.cpu1_rstctrl_va = ioremap(cfg.cpu1_rstctrl_pa, 4);
if (!cfg.cpu1_rstctrl_va)
return;
/*
* Initialise the SCU and wake up the secondary core using
* wakeup_secondary().
*/
if (scu_base)
scu_enable(scu_base);
if (cfg.scu_base)
scu_enable(cfg.scu_base);
if (cpu_is_omap446x())
startup_addr = omap4460_secondary_startup;
if (soc_is_dra74x() || soc_is_omap54xx())
omap5_erratum_workaround_801819();
/*
* Reset CPU1 before configuring, otherwise kexec will
* end up trying to use old kernel startup address.
*/
if (cfg.cpu1_rstctrl_va) {
writel_relaxed(1, cfg.cpu1_rstctrl_va);
readl_relaxed(cfg.cpu1_rstctrl_va);
writel_relaxed(0, cfg.cpu1_rstctrl_va);
}
/*
* Write the address of secondary startup routine into the
@ -264,19 +316,10 @@ static void __init omap4_smp_prepare_cpus(unsigned int max_cpus)
* A barrier is added to ensure that write buffer is drained
*/
if (omap_secure_apis_support())
omap_auxcoreboot_addr(virt_to_phys(startup_addr));
omap_auxcoreboot_addr(virt_to_phys(cfg.startup_addr));
else
/*
* If the boot CPU is in HYP mode then start secondary
* CPU in HYP mode as well.
*/
if ((__boot_cpu_mode & MODE_MASK) == HYP_MODE)
writel_relaxed(virt_to_phys(omap5_secondary_hyp_startup),
base + OMAP_AUX_CORE_BOOT_1);
else
writel_relaxed(virt_to_phys(omap5_secondary_startup),
base + OMAP_AUX_CORE_BOOT_1);
writel_relaxed(virt_to_phys(cfg.startup_addr),
base + OMAP_AUX_CORE_BOOT_1);
}
const struct smp_operations omap4_smp_ops __initconst = {
@ -286,5 +329,6 @@ const struct smp_operations omap4_smp_ops __initconst = {
.smp_boot_secondary = omap4_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_die = omap4_cpu_die,
.cpu_kill = omap4_cpu_kill,
#endif
};