octeontx: add support for OCTEON TX target

The Cavium OCTEON TX is an ARM 64-bit SoC leveraging CPU cores and
periperhals from the Cavium ThunderX SoC.

This initial support provides a 4.14 kernel and kernel+initramfs that is
bootable on the Gateworks Newport GW630x as well as the Cavium sff8104
reference board.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

1 files changed, 117 insertions, 0 deletions

diff --git a/target/linux/octeontx/patches-4.14/0001-net-thunderx-workaround-BGX-TX-Underflow-issue.patch b/target/linux/octeontx/patches-4.14/0001-net-thunderx-workaround-BGX-TX-Underflow-issue.patch
new file mode 100644
index 0000000000..db57f6dcca
--- /dev/null
+++ b/target/linux/octeontx/patches-4.14/0001-net-thunderx-workaround-BGX-TX-Underflow-issue.patch
@@ -0,0 +1,117 @@
+From b1e7791e688620c9bb8476ac2d0bc99abeb7f825 Mon Sep 17 00:00:00 2001
+From: Tim Harvey <tharvey@gateworks.com>
+Date: Fri, 29 Dec 2017 16:48:04 -0800
+Subject: [PATCH] net: thunderx: workaround BGX TX Underflow issue
+
+While it is not yet understood why a TX underflow can easily occur
+for SGMII interfaces resulting in a TX wedge. It has been found that
+disabling/re-enabling the LMAC resolves the issue.
+
+Signed-off-by: Tim Harvey <tharvey@gateworks.com>
+---
+ drivers/net/ethernet/cavium/thunder/thunder_bgx.c | 54 +++++++++++++++++++++++
+ drivers/net/ethernet/cavium/thunder/thunder_bgx.h |  9 ++++
+ 2 files changed, 63 insertions(+)
+
+diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+index 805c02a..0690966 100644
+--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
++++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+@@ -1344,6 +1344,54 @@ static int bgx_init_phy(struct bgx *bgx)
+ 	return bgx_init_of_phy(bgx);
+ }
+ 
++static irqreturn_t bgx_intr_handler(int irq, void *data)
++{
++	struct bgx *bgx = (struct bgx *)data;
++	struct device *dev = &bgx->pdev->dev;
++	u64 status, val;
++	int lmac;
++
++	for (lmac = 0; lmac < bgx->lmac_count; lmac++) {
++		status = bgx_reg_read(bgx, lmac, BGX_GMP_GMI_TXX_INT);
++		if (status & GMI_TXX_INT_UNDFLW) {
++			dev_err(dev, "BGX%d lmac%d UNDFLW\n", bgx->bgx_id,
++				lmac);
++			val = bgx_reg_read(bgx, lmac, BGX_CMRX_CFG);
++			val &= ~CMR_EN;
++			bgx_reg_write(bgx, lmac, BGX_CMRX_CFG, val);
++			val |= CMR_EN;
++			bgx_reg_write(bgx, lmac, BGX_CMRX_CFG, val);
++		}
++		/* clear interrupts */
++		bgx_reg_write(bgx, lmac, BGX_GMP_GMI_TXX_INT, status);
++	}
++
++	return IRQ_HANDLED;
++}
++
++static int bgx_register_intr(struct pci_dev *pdev)
++{
++	struct bgx *bgx = pci_get_drvdata(pdev);
++	struct device *dev = &pdev->dev;
++	int num_vec, ret;
++	char irq_name[32];
++
++	/* Enable MSI-X */
++	num_vec = pci_msix_vec_count(pdev);
++	ret = pci_alloc_irq_vectors(pdev, num_vec, num_vec, PCI_IRQ_MSIX);
++	if (ret < 0) {
++		dev_err(dev, "Req for #%d msix vectors failed\n", num_vec);
++		return 1;
++	}
++	sprintf(irq_name, "BGX%d", bgx->bgx_id);
++	ret = request_irq(pci_irq_vector(pdev, GMPX_GMI_TX_INT),
++		bgx_intr_handler, 0, irq_name, bgx);
++	if (ret)
++		return 1;
++
++	return 0;
++}
++
+ static int bgx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+ {
+ 	int err;
+@@ -1414,6 +1462,8 @@ static int bgx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+ 		xcv_init_hw(bgx->phy_mode);
+ 	bgx_init_hw(bgx);
+ 
++	bgx_register_intr(pdev);
++
+ 	/* Enable all LMACs */
+ 	for (lmac = 0; lmac < bgx->lmac_count; lmac++) {
+ 		err = bgx_lmac_enable(bgx, lmac);
+@@ -1424,6 +1474,10 @@ static int bgx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+ 				bgx_lmac_disable(bgx, --lmac);
+ 			goto err_enable;
+ 		}
++
++		/* enable TX FIFO Underflow interrupt */
++		bgx_reg_modify(bgx, lmac, BGX_GMP_GMI_TXX_INT_ENA_W1S,
++			       GMI_TXX_INT_UNDFLW);
+ 	}
+ 
+ 	return 0;
+diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
+index 2bba9d1..be9148f9 100644
+--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
++++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
+@@ -179,6 +179,15 @@
+ #define BGX_GMP_GMI_TXX_BURST		0x38228
+ #define BGX_GMP_GMI_TXX_MIN_PKT		0x38240
+ #define BGX_GMP_GMI_TXX_SGMII_CTL	0x38300
++#define BGX_GMP_GMI_TXX_INT		0x38500
++#define BGX_GMP_GMI_TXX_INT_W1S		0x38508
++#define BGX_GMP_GMI_TXX_INT_ENA_W1C	0x38510
++#define BGX_GMP_GMI_TXX_INT_ENA_W1S	0x38518
++#define  GMI_TXX_INT_PTP_LOST			BIT_ULL(4)
++#define  GMI_TXX_INT_LATE_COL			BIT_ULL(3)
++#define  GMI_TXX_INT_XSDEF			BIT_ULL(2)
++#define  GMI_TXX_INT_XSCOL			BIT_ULL(1)
++#define  GMI_TXX_INT_UNDFLW			BIT_ULL(0)
+ 
+ #define BGX_MSIX_VEC_0_29_ADDR		0x400000 /* +(0..29) << 4 */
+ #define BGX_MSIX_VEC_0_29_CTL		0x400008
+-- 
+2.7.4
+