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iommu: dart: Add suspend/resume support

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We need to save/restore the TCR/TTBR registers, since they are lost
on power gate.

Reviewed-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Hector Martin <marcan@marcan.st>
Link: https://lore.kernel.org/r/20230113105029.26654-3-marcan@marcan.st
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Hector Martin 2023-01-13 19:50:25 +09:00 committed by Joerg Roedel
parent 659bf8e582
commit 3d68bbb81b
1 changed files with 43 additions and 0 deletions
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43
drivers/iommu/apple-dart.c
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@ -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 +935,45 @@ static const struct apple_dart_hw apple_dart_hw_t6000 = {
.fmt = APPLE_DART2,
};
static __maybe_unused 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(dart->regs + DART_TTBR(sid, idx));
}
return 0;
}
static __maybe_unused 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(dart->save_ttbr[sid][idx],
dart->regs + DART_TTBR(sid, idx));
writel(dart->save_tcr[sid], dart->regs + DART_TCR(sid));
}
return 0;
}
DEFINE_SIMPLE_DEV_PM_OPS(apple_dart_pm_ops, apple_dart_suspend, apple_dart_resume);
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 +986,7 @@ static struct platform_driver apple_dart_driver = {
.name = "apple-dart",
.of_match_table = apple_dart_of_match,
.suppress_bind_attrs = true,
.pm = pm_sleep_ptr(&apple_dart_pm_ops),
},
.probe = apple_dart_probe,
.remove = apple_dart_remove,