The x86 power unit handles power management. Support initing this device which is modelled as a new type of system controller since there are no operations needed.
Signed-off-by: Simon Glass sjg@chromium.org ---
Changes in v3: - Fix 'err-%d' typo
Changes in v2: None
arch/x86/include/asm/cpu.h | 1 + arch/x86/lib/spl.c | 40 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 41 insertions(+)
diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h index feee0f915f6..21a05dab7de 100644 --- a/arch/x86/include/asm/cpu.h +++ b/arch/x86/include/asm/cpu.h @@ -55,6 +55,7 @@ enum { X86_SYSCON_PINCONF, /* Intel x86 pin configuration */ X86_SYSCON_PMU, /* Power Management Unit */ X86_SYSCON_SCU, /* System Controller Unit */ + X86_SYSCON_PUNIT, /* Power unit */ };
struct cpuid_result { diff --git a/arch/x86/lib/spl.c b/arch/x86/lib/spl.c index 7623fc9ada0..a8eaafeb5b5 100644 --- a/arch/x86/lib/spl.c +++ b/arch/x86/lib/spl.c @@ -5,11 +5,15 @@
#include <common.h> #include <debug_uart.h> +#include <dm.h> #include <malloc.h> #include <spl.h> +#include <syscon.h> #include <asm/cpu.h> +#include <asm/cpu_common.h> #include <asm/mrccache.h> #include <asm/mtrr.h> +#include <asm/pci.h> #include <asm/processor.h> #include <asm/spl.h> #include <asm-generic/sections.h> @@ -21,6 +25,32 @@ __weak int arch_cpu_init_dm(void) return 0; }
+#ifdef CONFIG_TPL + +static int set_max_freq(void) +{ + if (cpu_get_burst_mode_state() == BURST_MODE_UNAVAILABLE) { + /* + * Burst Mode has been factory-configured as disabled and is not + * available in this physical processor package + */ + debug("Burst Mode is factory-disabled\n"); + return -ENOENT; + } + + /* Enable burst mode */ + cpu_set_burst_mode(true); + + /* Enable speed step */ + cpu_set_eist(true); + + /* Set P-State ratio */ + cpu_set_p_state_to_turbo_ratio(); + + return 0; +} +#endif + static int x86_spl_init(void) { #ifndef CONFIG_TPL @@ -31,6 +61,8 @@ static int x86_spl_init(void) * place it immediately below CONFIG_SYS_TEXT_BASE. */ char *ptr = (char *)0x110000; +#else + struct udevice *punit; #endif int ret;
@@ -101,6 +133,14 @@ static int x86_spl_init(void) return ret; } mtrr_commit(true); +#else + ret = syscon_get_by_driver_data(X86_SYSCON_PUNIT, &punit); + if (ret) + debug("Could not find PUNIT (err=%d)\n", ret); + + ret = set_max_freq(); + if (ret) + debug("Failed to set CPU frequency (err=%d)\n", ret); #endif
return 0;