[net-next PATCH 3/4] octeontx2-af: Use ptp input clock info from firmware data

[Hariprasad Kelam]

From: Subbaraya Sundeep <sbhatta@xxxxxxxxxxx>

The input clock frequency of PTP block is figured
out from hardware reset block currently. The firmware
data already has this info in sclk. Hence simplify
ptp driver to use sclk from firmware data.

Signed-off-by: Subbaraya Sundeep <sbhatta@xxxxxxxxxxx>
Signed-off-by: Hariprasad Kelam <hkelam@xxxxxxxxxxx>
Signed-off-by: Sunil Goutham <sgoutham@xxxxxxxxxxx>
---
 .../net/ethernet/marvell/octeontx2/af/ptp.c   | 80 +++++++------------
 .../net/ethernet/marvell/octeontx2/af/ptp.h   |  1 +
 .../net/ethernet/marvell/octeontx2/af/rvu.c   |  3 +
 3 files changed, 33 insertions(+), 51 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/ptp.c b/drivers/net/ethernet/marvell/octeontx2/af/ptp.c
index 9b8e59f4c206..477491c001b6 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/ptp.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/ptp.c
@@ -27,7 +27,6 @@
 #define PCI_DEVID_CN10K_PTP			0xA09E
 
 #define PCI_PTP_BAR_NO				0
-#define PCI_RST_BAR_NO				0
 
 #define PTP_CLOCK_CFG				0xF00ULL
 #define PTP_CLOCK_CFG_PTP_EN			BIT_ULL(0)
@@ -35,46 +34,9 @@
 #define PTP_CLOCK_HI				0xF10ULL
 #define PTP_CLOCK_COMP				0xF18ULL
 
-#define RST_BOOT				0x1600ULL
-#define RST_MUL_BITS				GENMASK_ULL(38, 33)
-#define CLOCK_BASE_RATE				50000000ULL
-
 static struct ptp *first_ptp_block;
 static const struct pci_device_id ptp_id_table[];
 
-static u64 get_clock_rate(void)
-{
-	u64 cfg, ret = CLOCK_BASE_RATE * 16;
-	struct pci_dev *pdev;
-	void __iomem *base;
-
-	/* To get the input clock frequency with which PTP co-processor
-	 * block is running the base frequency(50 MHz) needs to be multiplied
-	 * with multiplier bits present in RST_BOOT register of RESET block.
-	 * Hence below code gets the multiplier bits from the RESET PCI
-	 * device present in the system.
-	 */
-	pdev = pci_get_device(PCI_VENDOR_ID_CAVIUM,
-			      PCI_DEVID_OCTEONTX2_RST, NULL);
-	if (!pdev)
-		goto error;
-
-	base = pci_ioremap_bar(pdev, PCI_RST_BAR_NO);
-	if (!base)
-		goto error_put_pdev;
-
-	cfg = readq(base + RST_BOOT);
-	ret = CLOCK_BASE_RATE * FIELD_GET(RST_MUL_BITS, cfg);
-
-	iounmap(base);
-
-error_put_pdev:
-	pci_dev_put(pdev);
-
-error:
-	return ret;
-}
-
 struct ptp *ptp_get(void)
 {
 	struct ptp *ptp = first_ptp_block;
@@ -145,13 +107,40 @@ static int ptp_get_clock(struct ptp *ptp, u64 *clk)
 	return 0;
 }
 
+void ptp_start(struct ptp *ptp, u64 sclk)
+{
+	struct pci_dev *pdev;
+	u64 clock_comp;
+	u64 clock_cfg;
+
+	if (!ptp)
+		return;
+
+	pdev = ptp->pdev;
+
+	if (!sclk) {
+		dev_err(&pdev->dev, "PTP input clock cannot be zero\n");
+		return;
+	}
+
+	/* sclk is in MHz */
+	ptp->clock_rate = sclk * 1000000;
+
+	/* Enable PTP clock */
+	clock_cfg = readq(ptp->reg_base + PTP_CLOCK_CFG);
+	clock_cfg |= PTP_CLOCK_CFG_PTP_EN;
+	writeq(clock_cfg, ptp->reg_base + PTP_CLOCK_CFG);
+
+	clock_comp = ((u64)1000000000ull << 32) / ptp->clock_rate;
+	/* Initial compensation value to start the nanosecs counter */
+	writeq(clock_comp, ptp->reg_base + PTP_CLOCK_COMP);
+}
+
 static int ptp_probe(struct pci_dev *pdev,
 		     const struct pci_device_id *ent)
 {
 	struct device *dev = &pdev->dev;
 	struct ptp *ptp;
-	u64 clock_comp;
-	u64 clock_cfg;
 	int err;
 
 	ptp = devm_kzalloc(dev, sizeof(*ptp), GFP_KERNEL);
@@ -172,17 +161,6 @@ static int ptp_probe(struct pci_dev *pdev,
 
 	ptp->reg_base = pcim_iomap_table(pdev)[PCI_PTP_BAR_NO];
 
-	ptp->clock_rate = get_clock_rate();
-
-	/* Enable PTP clock */
-	clock_cfg = readq(ptp->reg_base + PTP_CLOCK_CFG);
-	clock_cfg |= PTP_CLOCK_CFG_PTP_EN;
-	writeq(clock_cfg, ptp->reg_base + PTP_CLOCK_CFG);
-
-	clock_comp = ((u64)1000000000ull << 32) / ptp->clock_rate;
-	/* Initial compensation value to start the nanosecs counter */
-	writeq(clock_comp, ptp->reg_base + PTP_CLOCK_COMP);
-
 	pci_set_drvdata(pdev, ptp);
 	if (!first_ptp_block)
 		first_ptp_block = ptp;
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/ptp.h b/drivers/net/ethernet/marvell/octeontx2/af/ptp.h
index 76d404b24552..1ed350ad6f1f 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/ptp.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/ptp.h
@@ -20,6 +20,7 @@ struct ptp {
 
 struct ptp *ptp_get(void);
 void ptp_put(struct ptp *ptp);
+void ptp_start(struct ptp *ptp, u64 sclk);
 
 extern struct pci_driver ptp_driver;
 
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
index 5909173ff788..87a32a17d49e 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
@@ -3240,6 +3240,9 @@ static int rvu_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	mutex_init(&rvu->rswitch.switch_lock);
 
+	if (rvu->fwdata)
+		ptp_start(rvu->ptp, rvu->fwdata->sclk);
+
 	return 0;
 err_dl:
 	rvu_unregister_dl(rvu);
-- 
2.17.1