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116 lines
2.1 KiB
116 lines
2.1 KiB
// 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/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_alloc_size = sizeof(struct pmu_mid), |
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};
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