kernel: ahci: Implement initial HBA port logic

- Implement logic to scan the HBA for ports
- Implement logic to stop HBA ports
- Add ahci_init_port() stub

Signed-off-by: Ian Moffett <ian@osmora.org>

2 files changed, 32 insertions, 0 deletions

diff --git a/sys/include/dev/ic/ahciregs.h b/sys/include/dev/ic/ahciregs.h
index 4a4dc65..973c761 100644
--- a/sys/include/dev/ic/ahciregs.h
+++ b/sys/include/dev/ic/ahciregs.h
@@ -122,6 +122,8 @@ struct hba_memspace {
  */
 #define AHCI_CAP_NP(CAP) (CAP & 0x1F)           /* Number of ports */
 #define AHCI_CAP_NCS(CAP) ((CAP >> 8) & 0x1F)   /* Number of command slots */
+#define AHCI_CAP_EMS(CAP) ((CAP >> 6) & 1)      /* Enclosure management support */
+#define AHCI_CAP_SAL(CAP) ((CAP >> 25) & 1)     /* Supports activity LED */
 
 /*
  * Device detection (DET) and Interface power
diff --git a/sys/include/dev/ic/ahcivar.h b/sys/include/dev/ic/ahcivar.h
index 0d307cd..cc6d346 100644
--- a/sys/include/dev/ic/ahcivar.h
+++ b/sys/include/dev/ic/ahcivar.h
@@ -30,10 +30,40 @@
 #ifndef _IC_AHCIVAR_H_
 #define _IC_AHCIVAR_H_
 
+#include <sys/param.h>
+#include <sys/types.h>
 #include <dev/ic/ahciregs.h>
 
+/*
+ * AHCI Host Bus Adapter
+ *
+ * @io: HBA MMIO
+ * @maxports: Max number of HBA ports
+ * @nports: Number of implemented HBA ports.
+ * @nslots: Number of command slots
+ * @ems: Enclosure management support
+ * @sal: Supports activity LED
+ */
 struct ahci_hba {
     struct hba_memspace *io;
+    uint32_t maxports;
+    uint32_t nports;
+    uint32_t nslots;
+    uint8_t ems  : 1;
+    uint8_t sal  : 1;
+};
+
+/*
+ * A device attached to a physical HBA port.
+ *
+ * @io: Memory mapped port registers
+ * @hba: HBA descriptor
+ * @dev: Device minor number.
+ */
+struct hba_device {
+    struct hba_port *io;
+    struct ahci_hba *hba;
+    dev_t dev;
 };
 
 #define AHCI_TIMEOUT 500    /* In ms */