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authorSerge Semin <Sergey.Semin@baikalelectronics.ru>2022-09-09 22:36:09 +0300
committerDamien Le Moal <damien.lemoal@opensource.wdc.com>2022-09-16 19:39:38 +0300
commit03f1076fbe9fd0edd92011f1c97bf6daad83d01b (patch)
tree374f2b8782276ec22e6cc166add0bbcb4d5a20f1 /include/dt-bindings/ata/ahci.h
parentf67f12ff57bcfcd7d64280f748787793217faeaf (diff)
downloadlinux-03f1076fbe9fd0edd92011f1c97bf6daad83d01b.tar.xz
dt-bindings: ata: ahci: Add platform capability properties
In case if the platform doesn't have BIOS or a comprehensive firmware installed then the HBA capability flags will be left uninitialized. As a good alternative we suggest to define the DT-properties with the AHCI platform capabilities describing all the HW-init flags of the corresponding capability register. Luckily there aren't too many of them. SSS - Staggered Spin-up support and MPS - Mechanical Presence Switch support determine the corresponding feature availability for the whole HBA by means of the "hba-cap" property. Each port can have the "hba-port-cap" property initialized indicating that the port supports some of the next functionalities: HPCP - HotPlug capable port, MPSP - Mechanical Presence Switch attached to a port, CPD - Cold Plug detection, ESP - External SATA Port (eSATA), FBSCP - FIS-based switching capable port. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Diffstat (limited to 'include/dt-bindings/ata/ahci.h')
-rw-r--r--include/dt-bindings/ata/ahci.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/dt-bindings/ata/ahci.h b/include/dt-bindings/ata/ahci.h
new file mode 100644
index 000000000000..77997b35612c
--- /dev/null
+++ b/include/dt-bindings/ata/ahci.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause */
+/*
+ * This header provides constants for most AHCI bindings.
+ */
+
+#ifndef _DT_BINDINGS_ATA_AHCI_H
+#define _DT_BINDINGS_ATA_AHCI_H
+
+/* Host Bus Adapter generic platform capabilities */
+#define HBA_SSS (1 << 27)
+#define HBA_SMPS (1 << 28)
+
+/* Host Bus Adapter port-specific platform capabilities */
+#define HBA_PORT_HPCP (1 << 18)
+#define HBA_PORT_MPSP (1 << 19)
+#define HBA_PORT_CPD (1 << 20)
+#define HBA_PORT_ESP (1 << 21)
+#define HBA_PORT_FBSCP (1 << 22)
+
+#endif