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x86: spl: Support init of a PUNIT

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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>
This commit is contained in:
Simon Glass 2019-10-20 21:37:49 -06:00 committed by Bin Meng
parent a478a26cd0
commit c0e2c81d8e
2 changed files with 41 additions and 0 deletions
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1
arch/x86/include/asm/cpu.h
View File

@ -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 {

40
arch/x86/lib/spl.c
View File

@ -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;