crypto: octeontx2 - add support to map LMTST region for CN10K

On CN10K platform transmit/receive buffer alloc and free from/to
hardware had changed to support burst operation. Whereas pervious
silicon's only support single buffer free at a time.
To Support the same firmware allocates a DRAM region for each PF/VF for
storing LMTLINES. These LMTLINES are used to send CPT commands to HW.
PF/VF LMTST region is accessed via BAR4. PFs LMTST region is followed
by its VFs mbox memory. The size of region varies from 2KB to 256KB
based on number of LMTLINES configured.

This patch adds support for mapping of PF/VF LMTST region.

Signed-off-by: Srujana Challa <schalla@marvell.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/marvell/octeontx2/Makefile

@@ -2,9 +2,10 @@
 obj-$(CONFIG_CRYPTO_DEV_OCTEONTX2_CPT) += rvu_cptpf.o rvu_cptvf.o
 
 rvu_cptpf-objs := otx2_cptpf_main.o otx2_cptpf_mbox.o \
-		  otx2_cpt_mbox_common.o otx2_cptpf_ucode.o otx2_cptlf.o
+		  otx2_cpt_mbox_common.o otx2_cptpf_ucode.o otx2_cptlf.o \
+		  cn10k_cpt.o
 rvu_cptvf-objs := otx2_cptvf_main.o otx2_cptvf_mbox.o otx2_cptlf.o \
 		  otx2_cpt_mbox_common.o otx2_cptvf_reqmgr.o \
-		  otx2_cptvf_algs.o
+		  otx2_cptvf_algs.o cn10k_cpt.o
 
 ccflags-y += -I$(srctree)/drivers/net/ethernet/marvell/octeontx2/af

drivers/crypto/marvell/octeontx2/cn10k_cpt.c

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2021 Marvell. */
+
+#include "otx2_cptpf.h"
+#include "otx2_cptvf.h"
+#include "otx2_cptlf.h"
+#include "cn10k_cpt.h"
+
+int cn10k_cptpf_lmtst_init(struct otx2_cptpf_dev *cptpf)
+{
+	struct pci_dev *pdev = cptpf->pdev;
+	resource_size_t size;
+	u64 lmt_base;
+
+	if (!test_bit(CN10K_LMTST, &cptpf->cap_flag))
+		return 0;
+
+	lmt_base = readq(cptpf->reg_base + RVU_PF_LMTLINE_ADDR);
+	if (!lmt_base) {
+		dev_err(&pdev->dev, "PF LMTLINE address not configured\n");
+		return -ENOMEM;
+	}
+	size = pci_resource_len(pdev, PCI_MBOX_BAR_NUM);
+	size -= ((1 + cptpf->max_vfs) * MBOX_SIZE);
+	cptpf->lfs.lmt_base = devm_ioremap_wc(&pdev->dev, lmt_base, size);
+	if (!cptpf->lfs.lmt_base) {
+		dev_err(&pdev->dev,
+			"Mapping of PF LMTLINE address failed\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+int cn10k_cptvf_lmtst_init(struct otx2_cptvf_dev *cptvf)
+{
+	struct pci_dev *pdev = cptvf->pdev;
+	resource_size_t offset, size;
+
+	if (!test_bit(CN10K_LMTST, &cptvf->cap_flag))
+		return 0;
+
+	offset = pci_resource_start(pdev, PCI_MBOX_BAR_NUM);
+	size = pci_resource_len(pdev, PCI_MBOX_BAR_NUM);
+	/* Map VF LMILINE region */
+	cptvf->lfs.lmt_base = devm_ioremap_wc(&pdev->dev, offset, size);
+	if (!cptvf->lfs.lmt_base) {
+		dev_err(&pdev->dev, "Unable to map BAR4\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}

drivers/crypto/marvell/octeontx2/cn10k_cpt.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ * Copyright (C) 2021 Marvell.
+ */
+#ifndef __CN10K_CPT_H
+#define __CN10K_CPT_H
+
+#include "otx2_cptpf.h"
+#include "otx2_cptvf.h"
+
+int cn10k_cptpf_lmtst_init(struct otx2_cptpf_dev *cptpf);
+int cn10k_cptvf_lmtst_init(struct otx2_cptvf_dev *cptvf);
+
+#endif /* __CN10K_CPTLF_H */

drivers/crypto/marvell/octeontx2/otx2_cpt_common.h

@@ -27,6 +27,7 @@
 
 /* HW capability flags */
 #define CN10K_MBOX  0
+#define CN10K_LMTST 1
 
 #define BAD_OTX2_CPT_ENG_TYPE OTX2_CPT_MAX_ENG_TYPES
 
@@ -131,8 +132,10 @@ static inline bool is_dev_otx2(struct pci_dev *pdev)
 static inline void otx2_cpt_set_hw_caps(struct pci_dev *pdev,
 					unsigned long *cap_flag)
 {
-	if (!is_dev_otx2(pdev))
+	if (!is_dev_otx2(pdev)) {
 		__set_bit(CN10K_MBOX, cap_flag);
+		__set_bit(CN10K_LMTST, cap_flag);
+	}
 }
 
 

drivers/crypto/marvell/octeontx2/otx2_cptlf.h

@@ -87,6 +87,8 @@ struct otx2_cptlf_info {
 struct otx2_cptlfs_info {
 	/* Registers start address of VF/PF LFs are attached to */
 	void __iomem *reg_base;
+#define LMTLINE_SIZE  128
+	void __iomem *lmt_base;
 	struct pci_dev *pdev;   /* Device LFs are attached to */
 	struct otx2_cptlf_info lf[OTX2_CPT_MAX_LFS_NUM];
 	struct otx2_mbox *mbox;

drivers/crypto/marvell/octeontx2/otx2_cptpf_main.c

@@ -6,6 +6,7 @@
 #include "otx2_cpt_common.h"
 #include "otx2_cptpf_ucode.h"
 #include "otx2_cptpf.h"
+#include "cn10k_cpt.h"
 #include "rvu_reg.h"
 
 #define OTX2_CPT_DRV_NAME    "rvu_cptpf"
@@ -677,6 +678,10 @@ static int otx2_cptpf_probe(struct pci_dev *pdev,
 
 	cptpf->max_vfs = pci_sriov_get_totalvfs(pdev);
 
+	err = cn10k_cptpf_lmtst_init(cptpf);
+	if (err)
+		goto unregister_intr;
+
 	/* Initialize CPT PF device */
 	err = cptpf_device_init(cptpf);
 	if (err)

drivers/crypto/marvell/octeontx2/otx2_cptvf_main.c

@@ -5,6 +5,7 @@
 #include "otx2_cptvf.h"
 #include "otx2_cptlf.h"
 #include "otx2_cptvf_algs.h"
+#include "cn10k_cpt.h"
 #include <rvu_reg.h>
 
 #define OTX2_CPTVF_DRV_NAME "rvu_cptvf"
@@ -364,6 +365,11 @@ static int otx2_cptvf_probe(struct pci_dev *pdev,
 	cptvf->reg_base = pcim_iomap_table(pdev)[PCI_PF_REG_BAR_NUM];
 
 	otx2_cpt_set_hw_caps(pdev, &cptvf->cap_flag);
+
+	ret = cn10k_cptvf_lmtst_init(cptvf);
+	if (ret)
+		goto clear_drvdata;
+
 	/* Initialize PF<=>VF mailbox */
 	ret = cptvf_pfvf_mbox_init(cptvf);
 	if (ret)