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 <s...@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;
--
2.23.0.866.gb869b98d4c-goog
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
https://lists.denx.de/listinfo/u-boot
