octeontx2-af: cn10k: Add mbox support for CN10K platform

Firmware allocates memory regions for PFs and VFs in DRAM.
The PFs memory region is used for AF-PF and PF-VF mailbox.
This mbox facilitates communication between AF-PF and PF-VF.

On CN10K platform:
The DRAM region allocated to PF is enumerated as PF BAR4 memory.
PF BAR4 contains AF-PF mbox region followed by its VFs mbox region.
AF-PF mbox region base address is configured at RVU_AF_PFX_BAR4_ADDR
PF-VF mailbox base address is configured at
RVU_PF(x)_VF_MBOX_ADDR = RVU_AF_PF()_BAR4_ADDR+64KB. PF access its
mbox region via BAR4, whereas VF accesses PF-VF DRAM mailboxes via
BAR2 indirect access.

On CN9XX platform:
Mailbox region in DRAM is divided into two parts AF-PF mbox region and
PF-VF mbox region i.e all PFs mbox region is contiguous similarly all
VFs.
The base address of the AF-PF mbox region is configured at
RVU_AF_PF_BAR4_ADDR.
AF-PF1 mbox address can be calculated as RVU_AF_PF_BAR4_ADDR * mbox
size.
The base address of PF-VF mbox region for each PF is configure at
RVU_AF_PF(0..15)_VF_BAR4_ADDR.PF access its mbox region via BAR4 and its
VF mbox regions from RVU_PF_VF_BAR4_ADDR register, whereas VF access its
mbox region via BAR4.

This patch changes mbox initialization to support both CN9XX and CN10K
platform.

This patch also adds CN10K PTP subsystem and device IDs to ptp
driver id table.

Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 95 insertions, 27 deletions

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
index 50c2a1d800f4..1729a2ad093e 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
@@ -78,6 +78,9 @@ static void rvu_setup_hw_capabilities(struct rvu *rvu)
 		if (is_rvu_96xx_A0(rvu))
 			hw->cap.nix_rx_multicast = false;
 	}
+
+	if (!is_rvu_otx2(rvu))
+		hw->cap.per_pf_mbox_regs = true;
 }
 
 /* Poll a RVU block's register 'offset', for a 'zero'
@@ -1936,41 +1939,105 @@ static inline void rvu_afvf_mbox_up_handler(struct work_struct *work)
 	__rvu_mbox_up_handler(mwork, TYPE_AFVF);
 }
 
+static int rvu_get_mbox_regions(struct rvu *rvu, void **mbox_addr,
+				int num, int type)
+{
+	struct rvu_hwinfo *hw = rvu->hw;
+	int region;
+	u64 bar4;
+
+	/* For cn10k platform VF mailbox regions of a PF follows after the
+	 * PF <-> AF mailbox region. Whereas for Octeontx2 it is read from
+	 * RVU_PF_VF_BAR4_ADDR register.
+	 */
+	if (type == TYPE_AFVF) {
+		for (region = 0; region < num; region++) {
+			if (hw->cap.per_pf_mbox_regs) {
+				bar4 = rvu_read64(rvu, BLKADDR_RVUM,
+						  RVU_AF_PFX_BAR4_ADDR(0)) +
+						  MBOX_SIZE;
+				bar4 += region * MBOX_SIZE;
+			} else {
+				bar4 = rvupf_read64(rvu, RVU_PF_VF_BAR4_ADDR);
+				bar4 += region * MBOX_SIZE;
+			}
+			mbox_addr[region] = (void *)ioremap_wc(bar4, MBOX_SIZE);
+			if (!mbox_addr[region])
+				goto error;
+		}
+		return 0;
+	}
+
+	/* For cn10k platform AF <-> PF mailbox region of a PF is read from per
+	 * PF registers. Whereas for Octeontx2 it is read from
+	 * RVU_AF_PF_BAR4_ADDR register.
+	 */
+	for (region = 0; region < num; region++) {
+		if (hw->cap.per_pf_mbox_regs) {
+			bar4 = rvu_read64(rvu, BLKADDR_RVUM,
+					  RVU_AF_PFX_BAR4_ADDR(region));
+		} else {
+			bar4 = rvu_read64(rvu, BLKADDR_RVUM,
+					  RVU_AF_PF_BAR4_ADDR);
+			bar4 += region * MBOX_SIZE;
+		}
+		mbox_addr[region] = (void *)ioremap_wc(bar4, MBOX_SIZE);
+		if (!mbox_addr[region])
+			goto error;
+	}
+	return 0;
+
+error:
+	while (region--)
+		iounmap((void __iomem *)mbox_addr[region]);
+	return -ENOMEM;
+}
+
 static int rvu_mbox_init(struct rvu *rvu, struct mbox_wq_info *mw,
 			 int type, int num,
 			 void (mbox_handler)(struct work_struct *),
 			 void (mbox_up_handler)(struct work_struct *))
 {
-	void __iomem *hwbase = NULL, *reg_base;
-	int err, i, dir, dir_up;
+	int err = -EINVAL, i, dir, dir_up;
+	void __iomem *reg_base;
 	struct rvu_work *mwork;
+	void **mbox_regions;
 	const char *name;
-	u64 bar4_addr;
+
+	mbox_regions = kcalloc(num, sizeof(void *), GFP_KERNEL);
+	if (!mbox_regions)
+		return -ENOMEM;
 
 	switch (type) {
 	case TYPE_AFPF:
 		name = "rvu_afpf_mailbox";
-		bar4_addr = rvu_read64(rvu, BLKADDR_RVUM, RVU_AF_PF_BAR4_ADDR);
 		dir = MBOX_DIR_AFPF;
 		dir_up = MBOX_DIR_AFPF_UP;
 		reg_base = rvu->afreg_base;
+		err = rvu_get_mbox_regions(rvu, mbox_regions, num, TYPE_AFPF);
+		if (err)
+			goto free_regions;
 		break;
 	case TYPE_AFVF:
 		name = "rvu_afvf_mailbox";
-		bar4_addr = rvupf_read64(rvu, RVU_PF_VF_BAR4_ADDR);
 		dir = MBOX_DIR_PFVF;
 		dir_up = MBOX_DIR_PFVF_UP;
 		reg_base = rvu->pfreg_base;
+		err = rvu_get_mbox_regions(rvu, mbox_regions, num, TYPE_AFVF);
+		if (err)
+			goto free_regions;
 		break;
 	default:
-		return -EINVAL;
+		return err;
 	}
 
 	mw->mbox_wq = alloc_workqueue(name,
 				      WQ_UNBOUND | WQ_HIGHPRI | WQ_MEM_RECLAIM,
 				      num);
-	if (!mw->mbox_wq)
-		return -ENOMEM;
+	if (!mw->mbox_wq) {
+		err = -ENOMEM;
+		goto unmap_regions;
+	}
 
 	mw->mbox_wrk = devm_kcalloc(rvu->dev, num,
 				    sizeof(struct rvu_work), GFP_KERNEL);
@@ -1986,23 +2053,13 @@ static int rvu_mbox_init(struct rvu *rvu, struct mbox_wq_info *mw,
 		goto exit;
 	}
 
-	/* Mailbox is a reserved memory (in RAM) region shared between
-	 * RVU devices, shouldn't be mapped as device memory to allow
-	 * unaligned accesses.
-	 */
-	hwbase = ioremap_wc(bar4_addr, MBOX_SIZE * num);
-	if (!hwbase) {
-		dev_err(rvu->dev, "Unable to map mailbox region\n");
-		err = -ENOMEM;
-		goto exit;
-	}
-
-	err = otx2_mbox_init(&mw->mbox, hwbase, rvu->pdev, reg_base, dir, num);
+	err = otx2_mbox_regions_init(&mw->mbox, mbox_regions, rvu->pdev,
+				     reg_base, dir, num);
 	if (err)
 		goto exit;
 
-	err = otx2_mbox_init(&mw->mbox_up, hwbase, rvu->pdev,
-			     reg_base, dir_up, num);
+	err = otx2_mbox_regions_init(&mw->mbox_up, mbox_regions, rvu->pdev,
+				     reg_base, dir_up, num);
 	if (err)
 		goto exit;
 
@@ -2015,25 +2072,36 @@ static int rvu_mbox_init(struct rvu *rvu, struct mbox_wq_info *mw,
 		mwork->rvu = rvu;
 		INIT_WORK(&mwork->work, mbox_up_handler);
 	}
-
+	kfree(mbox_regions);
 	return 0;
+
 exit:
-	if (hwbase)
-		iounmap((void __iomem *)hwbase);
 	destroy_workqueue(mw->mbox_wq);
+unmap_regions:
+	while (num--)
+		iounmap((void __iomem *)mbox_regions[num]);
+free_regions:
+	kfree(mbox_regions);
 	return err;
 }
 
 static void rvu_mbox_destroy(struct mbox_wq_info *mw)
 {
+	struct otx2_mbox *mbox = &mw->mbox;
+	struct otx2_mbox_dev *mdev;
+	int devid;
+
 	if (mw->mbox_wq) {
 		flush_workqueue(mw->mbox_wq);
 		destroy_workqueue(mw->mbox_wq);
 		mw->mbox_wq = NULL;
 	}
 
-	if (mw->mbox.hwbase)
-		iounmap((void __iomem *)mw->mbox.hwbase);
+	for (devid = 0; devid < mbox->ndevs; devid++) {
+		mdev = &mbox->dev[devid];
+		if (mdev->hwbase)
+			iounmap((void __iomem *)mdev->hwbase);
+	}
 
 	otx2_mbox_destroy(&mw->mbox);
 	otx2_mbox_destroy(&mw->mbox_up);