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Message-Id: <20221205100907.10230-1-marcan@marcan.st> Date: Mon, 5 Dec 2022 19:09:07 +0900 From: Hector Martin <marcan@...can.st> To: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com> Cc: Sven Peter <sven@...npeter.dev>, Alyssa Rosenzweig <alyssa@...enzweig.io>, asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Hector Martin <marcan@...can.st> Subject: [PATCH] iommu: dart: Add suspend/resume support We need to save/restore the TCR/TTBR registers, since they are lost on power gate. Signed-off-by: Hector Martin <marcan@...can.st> --- drivers/iommu/apple-dart.c | 50 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c index 4f4a323be0d0..ed524765ad87 100644 --- a/drivers/iommu/apple-dart.c +++ b/drivers/iommu/apple-dart.c @@ -121,6 +121,9 @@ struct apple_dart { struct iommu_group *sid2group[DART_MAX_STREAMS]; struct iommu_device iommu; + + u32 save_tcr[DART_MAX_STREAMS]; + u32 save_ttbr[DART_MAX_STREAMS][DART_MAX_TTBR]; }; /* @@ -932,6 +935,50 @@ static const struct apple_dart_hw apple_dart_hw_t6000 = { .fmt = APPLE_DART2, }; +#ifdef CONFIG_PM_SLEEP +static int apple_dart_suspend(struct device *dev) +{ + struct apple_dart *dart = dev_get_drvdata(dev); + unsigned int sid, idx; + + for (sid = 0; sid < DART_MAX_STREAMS; sid++) { + dart->save_tcr[sid] = readl_relaxed(dart->regs + DART_TCR(sid)); + for (idx = 0; idx < DART_MAX_TTBR; idx++) + dart->save_ttbr[sid][idx] = + readl_relaxed(dart->regs + DART_TTBR(sid, idx)); + } + + return 0; +} + +static int apple_dart_resume(struct device *dev) +{ + struct apple_dart *dart = dev_get_drvdata(dev); + unsigned int sid, idx; + int ret; + + ret = apple_dart_hw_reset(dart); + if (ret) { + dev_err(dev, "Failed to reset DART on resume\n"); + return ret; + } + + for (sid = 0; sid < DART_MAX_STREAMS; sid++) { + for (idx = 0; idx < DART_MAX_TTBR; idx++) + writel_relaxed(dart->save_ttbr[sid][idx], + dart->regs + DART_TTBR(sid, idx)); + writel_relaxed(dart->save_tcr[sid], dart->regs + DART_TCR(sid)); + } + + return 0; +} + +static const struct dev_pm_ops apple_dart_pm_ops = { + .suspend = apple_dart_suspend, + .resume = apple_dart_resume, +}; +#endif + static const struct of_device_id apple_dart_of_match[] = { { .compatible = "apple,t8103-dart", .data = &apple_dart_hw_t8103 }, { .compatible = "apple,t6000-dart", .data = &apple_dart_hw_t6000 }, @@ -944,6 +991,9 @@ static struct platform_driver apple_dart_driver = { .name = "apple-dart", .of_match_table = apple_dart_of_match, .suppress_bind_attrs = true, +#ifdef CONFIG_PM_SLEEP + .pm = &apple_dart_pm_ops, +#endif }, .probe = apple_dart_probe, .remove = apple_dart_remove, -- 2.35.1
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