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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
117 lines
2.1 KiB
C
117 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2017 Intel Corporation
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*/
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#include <common.h>
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#include <dm.h>
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#include <regmap.h>
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#include <syscon.h>
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#include <asm/cpu.h>
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#include <asm/pmu.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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/* Registers */
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struct pmu_regs {
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u32 sts;
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u32 cmd;
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u32 ics;
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u32 reserved;
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u32 wkc[4];
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u32 wks[4];
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u32 ssc[4];
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u32 sss[4];
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};
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/* Bits in PMU_REGS_STS */
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#define PMU_REGS_STS_BUSY (1 << 8)
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struct pmu_mid {
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struct pmu_regs *regs;
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};
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static int pmu_read_status(struct pmu_regs *regs)
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{
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int retry = 500000;
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u32 val;
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do {
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val = readl(®s->sts);
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if (!(val & PMU_REGS_STS_BUSY))
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return 0;
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udelay(1);
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} while (--retry);
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printf("WARNING: PMU still busy\n");
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return -EBUSY;
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}
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static int pmu_power_lss(struct pmu_regs *regs, unsigned int lss, bool on)
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{
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unsigned int offset = (lss * 2) / 32;
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unsigned int shift = (lss * 2) % 32;
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u32 ssc;
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int ret;
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/* Check PMU status */
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ret = pmu_read_status(regs);
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if (ret)
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return ret;
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/* Read PMU values */
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ssc = readl(®s->sss[offset]);
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/* Modify PMU values */
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if (on)
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ssc &= ~(0x3 << shift); /* D0 */
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else
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ssc |= 0x3 << shift; /* D3hot */
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/* Write modified PMU values */
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writel(ssc, ®s->ssc[offset]);
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/* Update modified PMU values */
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writel(0x00002201, ®s->cmd);
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/* Check PMU status */
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return pmu_read_status(regs);
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}
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int pmu_turn_power(unsigned int lss, bool on)
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{
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struct pmu_mid *pmu;
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struct udevice *dev;
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int ret;
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ret = syscon_get_by_driver_data(X86_SYSCON_PMU, &dev);
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if (ret)
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return ret;
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pmu = dev_get_priv(dev);
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return pmu_power_lss(pmu->regs, lss, on);
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}
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static int pmu_mid_probe(struct udevice *dev)
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{
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struct pmu_mid *pmu = dev_get_priv(dev);
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pmu->regs = syscon_get_first_range(X86_SYSCON_PMU);
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return 0;
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}
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static const struct udevice_id pmu_mid_match[] = {
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{ .compatible = "intel,pmu-mid", .data = X86_SYSCON_PMU },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(intel_mid_pmu) = {
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.name = "pmu_mid",
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.id = UCLASS_SYSCON,
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.of_match = pmu_mid_match,
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.probe = pmu_mid_probe,
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.priv_auto = sizeof(struct pmu_mid),
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};
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