1 files changed, 303 insertions, 0 deletions

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mbox.c b/drivers/net/ethernet/marvell/octeontx2/af/mbox.c
new file mode 100644
index 000000000000..85ba24a05774
--- /dev/null
+++ b/drivers/net/ethernet/marvell/octeontx2/af/mbox.c
@@ -0,0 +1,303 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Marvell OcteonTx2 RVU Admin Function driver
+ *
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+
+#include "rvu_reg.h"
+#include "mbox.h"
+
+static const u16 msgs_offset = ALIGN(sizeof(struct mbox_hdr), MBOX_MSG_ALIGN);
+
+void otx2_mbox_reset(struct otx2_mbox *mbox, int devid)
+{
+	struct otx2_mbox_dev *mdev = &mbox->dev[devid];
+	struct mbox_hdr *tx_hdr, *rx_hdr;
+
+	tx_hdr = mdev->mbase + mbox->tx_start;
+	rx_hdr = mdev->mbase + mbox->rx_start;
+
+	spin_lock(&mdev->mbox_lock);
+	mdev->msg_size = 0;
+	mdev->rsp_size = 0;
+	tx_hdr->num_msgs = 0;
+	rx_hdr->num_msgs = 0;
+	spin_unlock(&mdev->mbox_lock);
+}
+EXPORT_SYMBOL(otx2_mbox_reset);
+
+void otx2_mbox_destroy(struct otx2_mbox *mbox)
+{
+	mbox->reg_base = NULL;
+	mbox->hwbase = NULL;
+
+	kfree(mbox->dev);
+	mbox->dev = NULL;
+}
+EXPORT_SYMBOL(otx2_mbox_destroy);
+
+int otx2_mbox_init(struct otx2_mbox *mbox, void *hwbase, struct pci_dev *pdev,
+		   void *reg_base, int direction, int ndevs)
+{
+	struct otx2_mbox_dev *mdev;
+	int devid;
+
+	switch (direction) {
+	case MBOX_DIR_AFPF:
+	case MBOX_DIR_PFVF:
+		mbox->tx_start = MBOX_DOWN_TX_START;
+		mbox->rx_start = MBOX_DOWN_RX_START;
+		mbox->tx_size  = MBOX_DOWN_TX_SIZE;
+		mbox->rx_size  = MBOX_DOWN_RX_SIZE;
+		break;
+	case MBOX_DIR_PFAF:
+	case MBOX_DIR_VFPF:
+		mbox->tx_start = MBOX_DOWN_RX_START;
+		mbox->rx_start = MBOX_DOWN_TX_START;
+		mbox->tx_size  = MBOX_DOWN_RX_SIZE;
+		mbox->rx_size  = MBOX_DOWN_TX_SIZE;
+		break;
+	case MBOX_DIR_AFPF_UP:
+	case MBOX_DIR_PFVF_UP:
+		mbox->tx_start = MBOX_UP_TX_START;
+		mbox->rx_start = MBOX_UP_RX_START;
+		mbox->tx_size  = MBOX_UP_TX_SIZE;
+		mbox->rx_size  = MBOX_UP_RX_SIZE;
+		break;
+	case MBOX_DIR_PFAF_UP:
+	case MBOX_DIR_VFPF_UP:
+		mbox->tx_start = MBOX_UP_RX_START;
+		mbox->rx_start = MBOX_UP_TX_START;
+		mbox->tx_size  = MBOX_UP_RX_SIZE;
+		mbox->rx_size  = MBOX_UP_TX_SIZE;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	switch (direction) {
+	case MBOX_DIR_AFPF:
+	case MBOX_DIR_AFPF_UP:
+		mbox->trigger = RVU_AF_AFPF_MBOX0;
+		mbox->tr_shift = 4;
+		break;
+	case MBOX_DIR_PFAF:
+	case MBOX_DIR_PFAF_UP:
+		mbox->trigger = RVU_PF_PFAF_MBOX1;
+		mbox->tr_shift = 0;
+		break;
+	case MBOX_DIR_PFVF:
+	case MBOX_DIR_PFVF_UP:
+		mbox->trigger = RVU_PF_VFX_PFVF_MBOX0;
+		mbox->tr_shift = 12;
+		break;
+	case MBOX_DIR_VFPF:
+	case MBOX_DIR_VFPF_UP:
+		mbox->trigger = RVU_VF_VFPF_MBOX1;
+		mbox->tr_shift = 0;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	mbox->reg_base = reg_base;
+	mbox->hwbase = hwbase;
+	mbox->pdev = pdev;
+
+	mbox->dev = kcalloc(ndevs, sizeof(struct otx2_mbox_dev), GFP_KERNEL);
+	if (!mbox->dev) {
+		otx2_mbox_destroy(mbox);
+		return -ENOMEM;
+	}
+
+	mbox->ndevs = ndevs;
+	for (devid = 0; devid < ndevs; devid++) {
+		mdev = &mbox->dev[devid];
+		mdev->mbase = mbox->hwbase + (devid * MBOX_SIZE);
+		spin_lock_init(&mdev->mbox_lock);
+		/* Init header to reset value */
+		otx2_mbox_reset(mbox, devid);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(otx2_mbox_init);
+
+int otx2_mbox_wait_for_rsp(struct otx2_mbox *mbox, int devid)
+{
+	struct otx2_mbox_dev *mdev = &mbox->dev[devid];
+	int timeout = 0, sleep = 1;
+
+	while (mdev->num_msgs != mdev->msgs_acked) {
+		msleep(sleep);
+		timeout += sleep;
+		if (timeout >= MBOX_RSP_TIMEOUT)
+			return -EIO;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(otx2_mbox_wait_for_rsp);
+
+int otx2_mbox_busy_poll_for_rsp(struct otx2_mbox *mbox, int devid)
+{
+	struct otx2_mbox_dev *mdev = &mbox->dev[devid];
+	unsigned long timeout = jiffies + 1 * HZ;
+
+	while (!time_after(jiffies, timeout)) {
+		if (mdev->num_msgs == mdev->msgs_acked)
+			return 0;
+		cpu_relax();
+	}
+	return -EIO;
+}
+EXPORT_SYMBOL(otx2_mbox_busy_poll_for_rsp);
+
+void otx2_mbox_msg_send(struct otx2_mbox *mbox, int devid)
+{
+	struct otx2_mbox_dev *mdev = &mbox->dev[devid];
+	struct mbox_hdr *tx_hdr, *rx_hdr;
+
+	tx_hdr = mdev->mbase + mbox->tx_start;
+	rx_hdr = mdev->mbase + mbox->rx_start;
+
+	spin_lock(&mdev->mbox_lock);
+	/* Reset header for next messages */
+	mdev->msg_size = 0;
+	mdev->rsp_size = 0;
+	mdev->msgs_acked = 0;
+
+	/* Sync mbox data into memory */
+	smp_wmb();
+
+	/* num_msgs != 0 signals to the peer that the buffer has a number of
+	 * messages.  So this should be written after writing all the messages
+	 * to the shared memory.
+	 */
+	tx_hdr->num_msgs = mdev->num_msgs;
+	rx_hdr->num_msgs = 0;
+	spin_unlock(&mdev->mbox_lock);
+
+	/* The interrupt should be fired after num_msgs is written
+	 * to the shared memory
+	 */
+	writeq(1, (void __iomem *)mbox->reg_base +
+	       (mbox->trigger | (devid << mbox->tr_shift)));
+}
+EXPORT_SYMBOL(otx2_mbox_msg_send);
+
+struct mbox_msghdr *otx2_mbox_alloc_msg_rsp(struct otx2_mbox *mbox, int devid,
+					    int size, int size_rsp)
+{
+	struct otx2_mbox_dev *mdev = &mbox->dev[devid];
+	struct mbox_msghdr *msghdr = NULL;
+
+	spin_lock(&mdev->mbox_lock);
+	size = ALIGN(size, MBOX_MSG_ALIGN);
+	size_rsp = ALIGN(size_rsp, MBOX_MSG_ALIGN);
+	/* Check if there is space in mailbox */
+	if ((mdev->msg_size + size) > mbox->tx_size - msgs_offset)
+		goto exit;
+	if ((mdev->rsp_size + size_rsp) > mbox->rx_size - msgs_offset)
+		goto exit;
+
+	if (mdev->msg_size == 0)
+		mdev->num_msgs = 0;
+	mdev->num_msgs++;
+
+	msghdr = mdev->mbase + mbox->tx_start + msgs_offset + mdev->msg_size;
+
+	/* Clear the whole msg region */
+	memset(msghdr, 0, sizeof(*msghdr) + size);
+	/* Init message header with reset values */
+	msghdr->ver = OTX2_MBOX_VERSION;
+	mdev->msg_size += size;
+	mdev->rsp_size += size_rsp;
+	msghdr->next_msgoff = mdev->msg_size + msgs_offset;
+exit:
+	spin_unlock(&mdev->mbox_lock);
+
+	return msghdr;
+}
+EXPORT_SYMBOL(otx2_mbox_alloc_msg_rsp);
+
+struct mbox_msghdr *otx2_mbox_get_rsp(struct otx2_mbox *mbox, int devid,
+				      struct mbox_msghdr *msg)
+{
+	unsigned long imsg = mbox->tx_start + msgs_offset;
+	unsigned long irsp = mbox->rx_start + msgs_offset;
+	struct otx2_mbox_dev *mdev = &mbox->dev[devid];
+	u16 msgs;
+
+	if (mdev->num_msgs != mdev->msgs_acked)
+		return ERR_PTR(-ENODEV);
+
+	for (msgs = 0; msgs < mdev->msgs_acked; msgs++) {
+		struct mbox_msghdr *pmsg = mdev->mbase + imsg;
+		struct mbox_msghdr *prsp = mdev->mbase + irsp;
+
+		if (msg == pmsg) {
+			if (pmsg->id != prsp->id)
+				return ERR_PTR(-ENODEV);
+			return prsp;
+		}
+
+		imsg = pmsg->next_msgoff;
+		irsp = prsp->next_msgoff;
+	}
+
+	return ERR_PTR(-ENODEV);
+}
+EXPORT_SYMBOL(otx2_mbox_get_rsp);
+
+int
+otx2_reply_invalid_msg(struct otx2_mbox *mbox, int devid, u16 pcifunc, u16 id)
+{
+	struct msg_rsp *rsp;
+
+	rsp = (struct msg_rsp *)
+	       otx2_mbox_alloc_msg(mbox, devid, sizeof(*rsp));
+	if (!rsp)
+		return -ENOMEM;
+	rsp->hdr.id = id;
+	rsp->hdr.sig = OTX2_MBOX_RSP_SIG;
+	rsp->hdr.rc = MBOX_MSG_INVALID;
+	rsp->hdr.pcifunc = pcifunc;
+	return 0;
+}
+EXPORT_SYMBOL(otx2_reply_invalid_msg);
+
+bool otx2_mbox_nonempty(struct otx2_mbox *mbox, int devid)
+{
+	struct otx2_mbox_dev *mdev = &mbox->dev[devid];
+	bool ret;
+
+	spin_lock(&mdev->mbox_lock);
+	ret = mdev->num_msgs != 0;
+	spin_unlock(&mdev->mbox_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(otx2_mbox_nonempty);
+
+const char *otx2_mbox_id2name(u16 id)
+{
+	switch (id) {
+#define M(_name, _id, _1, _2) case _id: return # _name;
+	MBOX_MESSAGES
+#undef M
+	default:
+		return "INVALID ID";
+	}
+}
+EXPORT_SYMBOL(otx2_mbox_id2name);
+
+MODULE_AUTHOR("Marvell International Ltd.");
+MODULE_LICENSE("GPL v2");