x86: spl: Support init of a PUNIT
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>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/lib/spl.c b/arch/x86/lib/spl.c
index 7623fc9..a8eaafe 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 @@
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 @@
* place it immediately below CONFIG_SYS_TEXT_BASE.
*/
char *ptr = (char *)0x110000;
+#else
+ struct udevice *punit;
#endif
int ret;
@@ -101,6 +133,14 @@
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;