[intelxl] Use function-level reset instead of PFGEN_CTRL.PFSWR

Remove knowledge of the PFGEN_CTRL register (which changes location
between XL710 and E810 register maps), and instead use PCIe FLR to
reset the physical function.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

4 files changed, 18 insertions, 39 deletions

diff --git a/src/drivers/net/intelxl.c b/src/drivers/net/intelxl.c
index 9d11f64..20db51a 100644
--- a/src/drivers/net/intelxl.c
+++ b/src/drivers/net/intelxl.c
@@ -46,31 +46,6 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /******************************************************************************
  *
- * Device reset
- *
- ******************************************************************************
- */
-
-/**
- * Reset hardware
- *
- * @v intelxl		Intel device
- * @ret rc		Return status code
- */
-static int intelxl_reset ( struct intelxl_nic *intelxl ) {
-	uint32_t pfgen_ctrl;
-
-	/* Perform a global software reset */
-	pfgen_ctrl = readl ( intelxl->regs + INTELXL_PFGEN_CTRL );
-	writel ( ( pfgen_ctrl | INTELXL_PFGEN_CTRL_PFSWR ),
-		 intelxl->regs + INTELXL_PFGEN_CTRL );
-	mdelay ( INTELXL_RESET_DELAY_MS );
-
-	return 0;
-}
-
-/******************************************************************************
- *
  * MAC address
  *
  ******************************************************************************
@@ -1704,9 +1679,17 @@ static int intelxl_probe ( struct pci_device *pci ) {
 	dma_set_mask_64bit ( intelxl->dma );
 	netdev->dma = intelxl->dma;
 
-	/* Reset the NIC */
-	if ( ( rc = intelxl_reset ( intelxl ) ) != 0 )
-		goto err_reset;
+	/* Locate PCI Express capability */
+	intelxl->exp = pci_find_capability ( pci, PCI_CAP_ID_EXP );
+	if ( ! intelxl->exp ) {
+		DBGC ( intelxl, "INTELXL %p missing PCIe capability\n",
+		       intelxl );
+		rc = -ENXIO;
+		goto err_exp;
+	}
+
+	/* Reset the function via PCIe FLR */
+	pci_reset ( pci, intelxl->exp );
 
 	/* Get function number, port number and base queue number */
 	pffunc_rid = readl ( intelxl->regs + INTELXL_PFFUNC_RID );
@@ -1787,8 +1770,8 @@ static int intelxl_probe ( struct pci_device *pci ) {
 	intelxl_msix_disable ( intelxl, pci );
  err_msix:
  err_fetch_mac:
-	intelxl_reset ( intelxl );
- err_reset:
+	pci_reset ( pci, intelxl->exp );
+ err_exp:
 	iounmap ( intelxl->regs );
  err_ioremap:
 	netdev_nullify ( netdev );
@@ -1816,7 +1799,7 @@ static void intelxl_remove ( struct pci_device *pci ) {
 	intelxl_msix_disable ( intelxl, pci );
 
 	/* Reset the NIC */
-	intelxl_reset ( intelxl );
+	pci_reset ( pci, intelxl->exp );
 
 	/* Free network device */
 	iounmap ( intelxl->regs );
diff --git a/src/drivers/net/intelxl.h b/src/drivers/net/intelxl.h
index f3b81e6..f3588bd 100644
--- a/src/drivers/net/intelxl.h
+++ b/src/drivers/net/intelxl.h
@@ -985,13 +985,6 @@ intelxl_init_ring ( struct intelxl_ring *ring, unsigned int count, size_t len,
 	INTELXL_QINT_TQCTL_NEXTQ_TYPE ( 0x1 )		/**< Transmit queue */
 #define INTELXL_QINT_TQCTL_CAUSE_ENA	0x40000000UL	/**< Enable */
 
-/** PF Control Register */
-#define INTELXL_PFGEN_CTRL 0x092400
-#define INTELXL_PFGEN_CTRL_PFSWR	0x00000001UL	/**< Software Reset */
-
-/** Time to delay for device reset, in milliseconds */
-#define INTELXL_RESET_DELAY_MS 100
-
 /** Function Requester ID Information Register */
 #define INTELXL_PFFUNC_RID 0x09c000
 #define INTELXL_PFFUNC_RID_FUNC_NUM(x) \
diff --git a/src/drivers/net/intelxlvf.c b/src/drivers/net/intelxlvf.c
index b5957a5..e0e7dc6 100644
--- a/src/drivers/net/intelxlvf.c
+++ b/src/drivers/net/intelxlvf.c
@@ -122,7 +122,7 @@ static int intelxlvf_reset_admin ( struct intelxl_nic *intelxl ) {
 		goto err_command;
 
 	/* Wait for minimum reset time */
-	mdelay ( INTELXL_RESET_DELAY_MS );
+	mdelay ( INTELXLVF_RESET_DELAY_MS );
 
 	/* Wait for reset to take effect */
 	if ( ( rc = intelxlvf_reset_wait_teardown ( intelxl ) ) != 0 )
diff --git a/src/drivers/net/intelxlvf.h b/src/drivers/net/intelxlvf.h
index ffcae56..cf449a7 100644
--- a/src/drivers/net/intelxlvf.h
+++ b/src/drivers/net/intelxlvf.h
@@ -64,6 +64,9 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #define INTELXLVF_VFGEN_RSTAT_VFR_STATE(x) ( (x) & 0x3 )
 #define INTELXLVF_VFGEN_RSTAT_VFR_STATE_ACTIVE 0x2
 
+/** Minimum time to wait for reset to complete */
+#define INTELXLVF_RESET_DELAY_MS 100
+
 /** Maximum time to wait for reset to complete */
 #define INTELXLVF_RESET_MAX_WAIT_MS 1000