mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-30 05:48:51 +09:00
![Simon Glass](/assets/img/avatar_default.png)
Move this uncommon header out of the common header. Signed-off-by: Simon Glass <sjg@chromium.org>
118 lines
2.1 KiB
C
118 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) 2017 Intel Corporation
|
|
*/
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <regmap.h>
|
|
#include <syscon.h>
|
|
#include <asm/cpu.h>
|
|
#include <asm/pmu.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/io.h>
|
|
|
|
/* Registers */
|
|
struct pmu_regs {
|
|
u32 sts;
|
|
u32 cmd;
|
|
u32 ics;
|
|
u32 reserved;
|
|
u32 wkc[4];
|
|
u32 wks[4];
|
|
u32 ssc[4];
|
|
u32 sss[4];
|
|
};
|
|
|
|
/* Bits in PMU_REGS_STS */
|
|
#define PMU_REGS_STS_BUSY (1 << 8)
|
|
|
|
struct pmu_mid {
|
|
struct pmu_regs *regs;
|
|
};
|
|
|
|
static int pmu_read_status(struct pmu_regs *regs)
|
|
{
|
|
int retry = 500000;
|
|
u32 val;
|
|
|
|
do {
|
|
val = readl(®s->sts);
|
|
if (!(val & PMU_REGS_STS_BUSY))
|
|
return 0;
|
|
|
|
udelay(1);
|
|
} while (--retry);
|
|
|
|
printf("WARNING: PMU still busy\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
static int pmu_power_lss(struct pmu_regs *regs, unsigned int lss, bool on)
|
|
{
|
|
unsigned int offset = (lss * 2) / 32;
|
|
unsigned int shift = (lss * 2) % 32;
|
|
u32 ssc;
|
|
int ret;
|
|
|
|
/* Check PMU status */
|
|
ret = pmu_read_status(regs);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Read PMU values */
|
|
ssc = readl(®s->sss[offset]);
|
|
|
|
/* Modify PMU values */
|
|
if (on)
|
|
ssc &= ~(0x3 << shift); /* D0 */
|
|
else
|
|
ssc |= 0x3 << shift; /* D3hot */
|
|
|
|
/* Write modified PMU values */
|
|
writel(ssc, ®s->ssc[offset]);
|
|
|
|
/* Update modified PMU values */
|
|
writel(0x00002201, ®s->cmd);
|
|
|
|
/* Check PMU status */
|
|
return pmu_read_status(regs);
|
|
}
|
|
|
|
int pmu_turn_power(unsigned int lss, bool on)
|
|
{
|
|
struct pmu_mid *pmu;
|
|
struct udevice *dev;
|
|
int ret;
|
|
|
|
ret = syscon_get_by_driver_data(X86_SYSCON_PMU, &dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
pmu = dev_get_priv(dev);
|
|
|
|
return pmu_power_lss(pmu->regs, lss, on);
|
|
}
|
|
|
|
static int pmu_mid_probe(struct udevice *dev)
|
|
{
|
|
struct pmu_mid *pmu = dev_get_priv(dev);
|
|
|
|
pmu->regs = syscon_get_first_range(X86_SYSCON_PMU);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id pmu_mid_match[] = {
|
|
{ .compatible = "intel,pmu-mid", .data = X86_SYSCON_PMU },
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(intel_mid_pmu) = {
|
|
.name = "pmu_mid",
|
|
.id = UCLASS_SYSCON,
|
|
.of_match = pmu_mid_match,
|
|
.probe = pmu_mid_probe,
|
|
.priv_auto_alloc_size = sizeof(struct pmu_mid),
|
|
};
|