From: Sam Edwards cfsworks@gmail.com
This is to prepare for R528, which does not have the typical "CPUCFG" block; it has a "CPUX" block which provides these same functions but is organized differently.
Moving the hardware-access bits to their own functions separates the logic from the hardware so we can reuse the same logic.
Signed-off-by: Sam Edwards CFSworks@gmail.com Reviewed-by: Andre Przywara andre.przywara@arm.com --- arch/arm/cpu/armv7/sunxi/psci.c | 66 +++++++++++++++++++++++---------- 1 file changed, 47 insertions(+), 19 deletions(-)
diff --git a/arch/arm/cpu/armv7/sunxi/psci.c b/arch/arm/cpu/armv7/sunxi/psci.c index 69fa3f3c2eb..27ca9c39e18 100644 --- a/arch/arm/cpu/armv7/sunxi/psci.c +++ b/arch/arm/cpu/armv7/sunxi/psci.c @@ -92,7 +92,7 @@ static void __secure clamp_set(u32 *clamp) writel(0xff, clamp); }
-static void __secure sunxi_set_entry_address(void *entry) +static void __secure sunxi_cpu_set_entry(int __always_unused cpu, void *entry) { /* secondary core entry address is programmed differently on R40 */ if (IS_ENABLED(CONFIG_MACH_SUN8I_R40)) { @@ -149,30 +149,60 @@ static void __secure sunxi_cpu_set_power(int cpu, bool on) } }
-void __secure sunxi_cpu_power_off(u32 cpuid) +static void __secure sunxi_cpu_set_reset(int cpu, bool reset) { struct sunxi_cpucfg_reg *cpucfg = (struct sunxi_cpucfg_reg *)SUNXI_CPUCFG_BASE; + + writel(reset ? 0b00 : 0b11, &cpucfg->cpu[cpu].rst); +} + +static void __secure sunxi_cpu_set_locking(int cpu, bool lock) +{ + struct sunxi_cpucfg_reg *cpucfg = + (struct sunxi_cpucfg_reg *)SUNXI_CPUCFG_BASE; + + if (lock) + clrbits_le32(&cpucfg->dbg_ctrl1, BIT(cpu)); + else + setbits_le32(&cpucfg->dbg_ctrl1, BIT(cpu)); +} + +static bool __secure sunxi_cpu_poll_wfi(int cpu) +{ + struct sunxi_cpucfg_reg *cpucfg = + (struct sunxi_cpucfg_reg *)SUNXI_CPUCFG_BASE; + + return !!(readl(&cpucfg->cpu[cpu].status) & BIT(2)); +} + +static void __secure sunxi_cpu_invalidate_cache(int cpu) +{ + struct sunxi_cpucfg_reg *cpucfg = + (struct sunxi_cpucfg_reg *)SUNXI_CPUCFG_BASE; + + clrbits_le32(&cpucfg->gen_ctrl, BIT(cpu)); +} + +static void __secure sunxi_cpu_power_off(u32 cpuid) +{ u32 cpu = cpuid & 0x3;
/* Wait for the core to enter WFI */ - while (1) { - if (readl(&cpucfg->cpu[cpu].status) & BIT(2)) - break; + while (!sunxi_cpu_poll_wfi(cpu)) __mdelay(1); - }
/* Assert reset on target CPU */ - writel(0, &cpucfg->cpu[cpu].rst); + sunxi_cpu_set_reset(cpu, true);
/* Lock CPU (Disable external debug access) */ - clrbits_le32(&cpucfg->dbg_ctrl1, BIT(cpu)); + sunxi_cpu_set_locking(cpu, true);
/* Power down CPU */ sunxi_cpu_set_power(cpuid, false);
- /* Unlock CPU (Disable external debug access) */ - setbits_le32(&cpucfg->dbg_ctrl1, BIT(cpu)); + /* Unlock CPU (Reenable external debug access) */ + sunxi_cpu_set_locking(cpu, false); }
static u32 __secure cp15_read_scr(void) @@ -229,33 +259,31 @@ out: int __secure psci_cpu_on(u32 __always_unused unused, u32 mpidr, u32 pc, u32 context_id) { - struct sunxi_cpucfg_reg *cpucfg = - (struct sunxi_cpucfg_reg *)SUNXI_CPUCFG_BASE; u32 cpu = (mpidr & 0x3);
/* store target PC and context id */ psci_save(cpu, pc, context_id);
/* Set secondary core power on PC */ - sunxi_set_entry_address(&psci_cpu_entry); + sunxi_cpu_set_entry(cpu, &psci_cpu_entry);
/* Assert reset on target CPU */ - writel(0, &cpucfg->cpu[cpu].rst); + sunxi_cpu_set_reset(cpu, true);
/* Invalidate L1 cache */ - clrbits_le32(&cpucfg->gen_ctrl, BIT(cpu)); + sunxi_cpu_invalidate_cache(cpu);
/* Lock CPU (Disable external debug access) */ - clrbits_le32(&cpucfg->dbg_ctrl1, BIT(cpu)); + sunxi_cpu_set_locking(cpu, true);
/* Power up target CPU */ sunxi_cpu_set_power(cpu, true);
/* De-assert reset on target CPU */ - writel(BIT(1) | BIT(0), &cpucfg->cpu[cpu].rst); + sunxi_cpu_set_reset(cpu, false);
- /* Unlock CPU (Disable external debug access) */ - setbits_le32(&cpucfg->dbg_ctrl1, BIT(cpu)); + /* Unlock CPU (Reenable external debug access) */ + sunxi_cpu_set_locking(cpu, false);
return ARM_PSCI_RET_SUCCESS; }