From 6018ed09c35b35343cf64133529850ddc8071138 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Thu, 20 Feb 2025 10:33:00 -0500
Subject: kernel: ahci: Ensure HBA is AHCI aware
Signed-off-by: Ian Moffett <ian@osmora.org>
---
sys/dev/ic/ahci.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
(limited to 'sys/dev')
diff --git a/sys/dev/ic/ahci.c b/sys/dev/ic/ahci.c
index 027ad66..ec7e68a 100644
--- a/sys/dev/ic/ahci.c
+++ b/sys/dev/ic/ahci.c
@@ -117,7 +117,9 @@ ahci_hba_reset(struct ahci_hba *hba)
static int
ahci_hba_init(struct ahci_hba *hba)
{
+ struct hba_memspace *abar = hba->io;
int error;
+ uint32_t tmp;
/*
* God knows what state the HBA is in by the time
@@ -130,6 +132,16 @@ ahci_hba_init(struct ahci_hba *hba)
}
pr_trace("Successfully performed a hard reset.\n");
+
+ /*
+ * The HBA provides backwards compatibility with
+ * legacy ATA mechanisms (e.g., SFF-8038i), therefore
+ * in order for this driver to work we need to ensure
+ * the HBA is AHCI aware.
+ */
+ tmp = mmio_read32(&abar->ghc);
+ tmp |= AHCI_GHC_AE;
+ mmio_write32(&abar->ghc, tmp);
return 0;
}
--
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