From cb8be2945773a37f4f569ce08c79d27af1a172df Mon Sep 17 00:00:00 2001
From: Marcus Overhagen <marcusoverhagen@gmail.com>
Date: Sat, 22 Sep 2007 23:43:25 +0000
Subject: [PATCH] Start and stop DMA engine and FIS receive, enable port
 interrupts.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22278 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 .../kernel/busses/scsi/ahci/ahci_defs.h       | 39 +++++++++++++++
 .../kernel/busses/scsi/ahci/ahci_port.cpp     | 49 ++++++++++++++++++-
 2 files changed, 87 insertions(+), 1 deletion(-)

diff --git a/src/add-ons/kernel/busses/scsi/ahci/ahci_defs.h b/src/add-ons/kernel/busses/scsi/ahci/ahci_defs.h
index 66cc17c081..8c8efa1629 100644
--- a/src/add-ons/kernel/busses/scsi/ahci/ahci_defs.h
+++ b/src/add-ons/kernel/busses/scsi/ahci/ahci_defs.h
@@ -91,6 +91,45 @@ typedef struct {
 } _PACKED ahci_port;
 
 
+enum {
+	PORT_CMD_ICC_ACTIVE	 = (1 << 28),	// Interface Communication control
+	PORT_CMD_ICC_SLUMBER = (6 << 28),	// Interface Communication control
+	PORT_CMD_CR		= (1 << 15),	// Command List Running (DMA active)
+	PORT_CMD_FR		= (1 << 14),	// FIS Receive Running
+	PORT_CMD_FER	= (1 << 4),		// FIS Receive Enable
+	PORT_CMD_CLO	= (1 << 3),		// Command List Override
+	PORT_CMD_POD	= (1 << 2),		// Power On Device
+	PORT_CMD_SUD	= (1 << 1),		// Spin-up Device
+	PORT_CMD_ST		= (1 << 0),		// Start DMA
+};
+
+
+enum {
+	PORT_INT_CPD	= (1 << 31),	// Cold Presence Detect Status/Enable
+	PORT_INT_TFE	= (1 << 30),	// Task File Error Status/Enable
+	PORT_INT_HBF	= (1 << 29),	// Host Bus Fatal Error Status/Enable
+	PORT_INT_HBD	= (1 << 28),	// Host Bus Data Error Status/Enable
+	PORT_INT_IF		= (1 << 27),	// Interface Fatal Error Status/Enable
+	PORT_INT_INF	= (1 << 26),	// Interface Non-fatal Error Status/Enable
+	PORT_INT_OF		= (1 << 24),	// Overflow Status/Enable
+	PORT_INT_IPM	= (1 << 23),	// Incorrect Port Multiplier Status/Enable
+	PORT_INT_PRCE	= (1 << 22),	// PhyRdy Change Status/Enable
+	PORT_INT_DI		= (1 << 7),		// Device Interlock Status/Enable
+	PORT_INT_PC		= (1 << 6),		// Port Change Status/Enable
+	PORT_INT_DP		= (1 << 5),		// Descriptor Processed Interrupt
+	PORT_INT_UF		= (1 << 4),		// Unknown FIS Interrupt 
+	PORT_INT_SDB	= (1 << 3),		// Set Device Bits FIS Interrupt 
+	PORT_INT_DS		= (1 << 2),		// DMA Setup FIS Interrupt 
+	PORT_INT_PS		= (1 << 1),		// PIO Setup FIS Interrupt
+	PORT_INT_DHR	= (1 << 0),		// Device to Host Register FIS Interrupt
+};
+
+#define PORT_INT_FATAL	(PORT_INT_HBF | PORT_INT_IF | PORT_INT_IPM | PORT_INT_UF)
+#define PORT_INT_ERROR 	(PORT_INT_TFE | PORT_INT_HBD)
+#define PORT_INT_MASK	(PORT_INT_FATAL | PORT_INT_ERROR | PORT_INT_DP |\
+						 PORT_INT_SDB | PORT_INT_DS | PORT_INT_PS | PORT_INT_DHR)
+
+
 typedef struct {
 	uint32		cap;			// Host Capabilities
 	uint32		ghc;			// Global Host Control
diff --git a/src/add-ons/kernel/busses/scsi/ahci/ahci_port.cpp b/src/add-ons/kernel/busses/scsi/ahci/ahci_port.cpp
index 2200db89c2..40e71950ae 100644
--- a/src/add-ons/kernel/busses/scsi/ahci/ahci_port.cpp
+++ b/src/add-ons/kernel/busses/scsi/ahci/ahci_port.cpp
@@ -63,6 +63,21 @@ AHCIPort::Init()
 	fCommandList[0].ctbau = HI32(physAddr);
 	// prdt follows after command table
 
+	// clear IRQ status bits
+	fRegs->is = fRegs->is;
+
+	// clear error bits
+	fRegs->serr = fRegs->serr;
+	
+	// enable FIS receive
+	fRegs->cmd |= PORT_CMD_FER;
+
+	// start DMA engine
+	fRegs->cmd |= PORT_CMD_ST;
+
+	// enable interrupts
+	fRegs->ie = PORT_INT_MASK;
+
 	return B_OK;
 }
 
@@ -72,6 +87,34 @@ AHCIPort::Uninit()
 {
 	TRACE("AHCIPort::Uninit port %d\n", fIndex);
 
+	// disable FIS receive
+	fRegs->cmd &= ~PORT_CMD_FER;
+
+	// wait for receive completition, up to 500ms
+	for (int i = 0; i <	15; i++) {
+		if (!(fRegs->cmd & PORT_CMD_FR))
+			break;
+		snooze(50000);
+	}
+
+	if (fRegs->cmd & PORT_CMD_FR) {
+		TRACE("AHCIPort::Uninit port %d error FIS rx still running\n", fIndex);
+	}
+
+	// stop DMA engine
+	fRegs->cmd &= ~PORT_CMD_ST;
+
+	// wait for DMA completition
+	for (int i = 0; i <	15; i++) {
+		if (!(fRegs->cmd & PORT_CMD_CR))
+			break;
+		snooze(50000);
+	}
+
+	if (fRegs->cmd & PORT_CMD_CR) {
+		TRACE("AHCIPort::Uninit port %d error DMA engine still running\n", fIndex);
+	}
+
 	// disable interrupts
 	fRegs->ie = 0;
 	
@@ -91,7 +134,11 @@ AHCIPort::Uninit()
 void
 AHCIPort::Interrupt()
 {
-	TRACE("AHCIPort::Interrupt port %d\n", fIndex);
+	uint32 is = fRegs->is;
+	TRACE("AHCIPort::Interrupt port %d, status %#08x\n", fIndex, is);
+
+	// clear interrupts
+	fRegs->is = is;
 }