summaryrefslogtreecommitdiffstats
path: root/drivers/ntb/hw/amd
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/ntb/hw/amd')
-rw-r--r--drivers/ntb/hw/amd/Kconfig8
-rw-r--r--drivers/ntb/hw/amd/Makefile2
-rw-r--r--drivers/ntb/hw/amd/ntb_hw_amd.c1360
-rw-r--r--drivers/ntb/hw/amd/ntb_hw_amd.h223
4 files changed, 1593 insertions, 0 deletions
diff --git a/drivers/ntb/hw/amd/Kconfig b/drivers/ntb/hw/amd/Kconfig
new file mode 100644
index 000000000..dd9fb9e5c
--- /dev/null
+++ b/drivers/ntb/hw/amd/Kconfig
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config NTB_AMD
+ tristate "AMD Non-Transparent Bridge support"
+ depends on X86_64
+ help
+ This driver supports AMD NTB on capable Zeppelin hardware.
+
+ If unsure, say N.
diff --git a/drivers/ntb/hw/amd/Makefile b/drivers/ntb/hw/amd/Makefile
new file mode 100644
index 000000000..7c23b4a7f
--- /dev/null
+++ b/drivers/ntb/hw/amd/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_NTB_AMD) += ntb_hw_amd.o
diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.c b/drivers/ntb/hw/amd/ntb_hw_amd.c
new file mode 100644
index 000000000..730f2103b
--- /dev/null
+++ b/drivers/ntb/hw/amd/ntb_hw_amd.c
@@ -0,0 +1,1360 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright (C) 2016 Advanced Micro Devices, Inc. All Rights Reserved.
+ * Copyright (C) 2016 T-Platforms. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * BSD LICENSE
+ *
+ * Copyright (C) 2016 Advanced Micro Devices, Inc. All Rights Reserved.
+ * Copyright (C) 2016 T-Platforms. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copy
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of AMD Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * AMD PCIe NTB Linux driver
+ *
+ * Contact Information:
+ * Xiangliang Yu <Xiangliang.Yu@amd.com>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/pci.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/ntb.h>
+
+#include "ntb_hw_amd.h"
+
+#define NTB_NAME "ntb_hw_amd"
+#define NTB_DESC "AMD(R) PCI-E Non-Transparent Bridge Driver"
+#define NTB_VER "1.0"
+
+MODULE_DESCRIPTION(NTB_DESC);
+MODULE_VERSION(NTB_VER);
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("AMD Inc.");
+
+static const struct file_operations amd_ntb_debugfs_info;
+static struct dentry *debugfs_dir;
+
+static int ndev_mw_to_bar(struct amd_ntb_dev *ndev, int idx)
+{
+ if (idx < 0 || idx > ndev->mw_count)
+ return -EINVAL;
+
+ return ndev->dev_data->mw_idx << idx;
+}
+
+static int amd_ntb_mw_count(struct ntb_dev *ntb, int pidx)
+{
+ if (pidx != NTB_DEF_PEER_IDX)
+ return -EINVAL;
+
+ return ntb_ndev(ntb)->mw_count;
+}
+
+static int amd_ntb_mw_get_align(struct ntb_dev *ntb, int pidx, int idx,
+ resource_size_t *addr_align,
+ resource_size_t *size_align,
+ resource_size_t *size_max)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ int bar;
+
+ if (pidx != NTB_DEF_PEER_IDX)
+ return -EINVAL;
+
+ bar = ndev_mw_to_bar(ndev, idx);
+ if (bar < 0)
+ return bar;
+
+ if (addr_align)
+ *addr_align = SZ_4K;
+
+ if (size_align)
+ *size_align = 1;
+
+ if (size_max)
+ *size_max = pci_resource_len(ndev->ntb.pdev, bar);
+
+ return 0;
+}
+
+static int amd_ntb_mw_set_trans(struct ntb_dev *ntb, int pidx, int idx,
+ dma_addr_t addr, resource_size_t size)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ unsigned long xlat_reg, limit_reg = 0;
+ resource_size_t mw_size;
+ void __iomem *mmio, *peer_mmio;
+ u64 base_addr, limit, reg_val;
+ int bar;
+
+ if (pidx != NTB_DEF_PEER_IDX)
+ return -EINVAL;
+
+ bar = ndev_mw_to_bar(ndev, idx);
+ if (bar < 0)
+ return bar;
+
+ mw_size = pci_resource_len(ntb->pdev, bar);
+
+ /* make sure the range fits in the usable mw size */
+ if (size > mw_size)
+ return -EINVAL;
+
+ mmio = ndev->self_mmio;
+ peer_mmio = ndev->peer_mmio;
+
+ base_addr = pci_resource_start(ntb->pdev, bar);
+
+ if (bar != 1) {
+ xlat_reg = AMD_BAR23XLAT_OFFSET + ((bar - 2) << 2);
+ limit_reg = AMD_BAR23LMT_OFFSET + ((bar - 2) << 2);
+
+ /* Set the limit if supported */
+ limit = size;
+
+ /* set and verify setting the translation address */
+ write64(addr, peer_mmio + xlat_reg);
+ reg_val = read64(peer_mmio + xlat_reg);
+ if (reg_val != addr) {
+ write64(0, peer_mmio + xlat_reg);
+ return -EIO;
+ }
+
+ /* set and verify setting the limit */
+ write64(limit, peer_mmio + limit_reg);
+ reg_val = read64(peer_mmio + limit_reg);
+ if (reg_val != limit) {
+ write64(base_addr, mmio + limit_reg);
+ write64(0, peer_mmio + xlat_reg);
+ return -EIO;
+ }
+ } else {
+ xlat_reg = AMD_BAR1XLAT_OFFSET;
+ limit_reg = AMD_BAR1LMT_OFFSET;
+
+ /* Set the limit if supported */
+ limit = size;
+
+ /* set and verify setting the translation address */
+ write64(addr, peer_mmio + xlat_reg);
+ reg_val = read64(peer_mmio + xlat_reg);
+ if (reg_val != addr) {
+ write64(0, peer_mmio + xlat_reg);
+ return -EIO;
+ }
+
+ /* set and verify setting the limit */
+ writel(limit, peer_mmio + limit_reg);
+ reg_val = readl(peer_mmio + limit_reg);
+ if (reg_val != limit) {
+ writel(base_addr, mmio + limit_reg);
+ writel(0, peer_mmio + xlat_reg);
+ return -EIO;
+ }
+ }
+
+ return 0;
+}
+
+static int amd_ntb_get_link_status(struct amd_ntb_dev *ndev)
+{
+ struct pci_dev *pdev = NULL;
+ struct pci_dev *pci_swds = NULL;
+ struct pci_dev *pci_swus = NULL;
+ u32 stat;
+ int rc;
+
+ if (ndev->ntb.topo == NTB_TOPO_SEC) {
+ /* Locate the pointer to Downstream Switch for this device */
+ pci_swds = pci_upstream_bridge(ndev->ntb.pdev);
+ if (pci_swds) {
+ /*
+ * Locate the pointer to Upstream Switch for
+ * the Downstream Switch.
+ */
+ pci_swus = pci_upstream_bridge(pci_swds);
+ if (pci_swus) {
+ rc = pcie_capability_read_dword(pci_swus,
+ PCI_EXP_LNKCTL,
+ &stat);
+ if (rc)
+ return 0;
+ } else {
+ return 0;
+ }
+ } else {
+ return 0;
+ }
+ } else if (ndev->ntb.topo == NTB_TOPO_PRI) {
+ /*
+ * For NTB primary, we simply read the Link Status and control
+ * register of the NTB device itself.
+ */
+ pdev = ndev->ntb.pdev;
+ rc = pcie_capability_read_dword(pdev, PCI_EXP_LNKCTL, &stat);
+ if (rc)
+ return 0;
+ } else {
+ /* Catch all for everything else */
+ return 0;
+ }
+
+ ndev->lnk_sta = stat;
+
+ return 1;
+}
+
+static int amd_link_is_up(struct amd_ntb_dev *ndev)
+{
+ int ret;
+
+ /*
+ * We consider the link to be up under two conditions:
+ *
+ * - When a link-up event is received. This is indicated by
+ * AMD_LINK_UP_EVENT set in peer_sta.
+ * - When driver on both sides of the link have been loaded.
+ * This is indicated by bit 1 being set in the peer
+ * SIDEINFO register.
+ *
+ * This function should return 1 when the latter of the above
+ * two conditions is true.
+ *
+ * Now consider the sequence of events - Link-Up event occurs,
+ * then the peer side driver loads. In this case, we would have
+ * received LINK_UP event and bit 1 of peer SIDEINFO is also
+ * set. What happens now if the link goes down? Bit 1 of
+ * peer SIDEINFO remains set, but LINK_DOWN bit is set in
+ * peer_sta. So we should return 0 from this function. Not only
+ * that, we clear bit 1 of peer SIDEINFO to 0, since the peer
+ * side driver did not even get a chance to clear it before
+ * the link went down. This can be the case of surprise link
+ * removal.
+ *
+ * LINK_UP event will always occur before the peer side driver
+ * gets loaded the very first time. So there can be a case when
+ * the LINK_UP event has occurred, but the peer side driver hasn't
+ * yet loaded. We return 0 in that case.
+ *
+ * There is also a special case when the primary side driver is
+ * unloaded and then loaded again. Since there is no change in
+ * the status of NTB secondary in this case, there is no Link-Up
+ * or Link-Down notification received. We recognize this condition
+ * with peer_sta being set to 0.
+ *
+ * If bit 1 of peer SIDEINFO register is not set, then we
+ * simply return 0 irrespective of the link up or down status
+ * set in peer_sta.
+ */
+ ret = amd_poll_link(ndev);
+ if (ret) {
+ /*
+ * We need to check the below only for NTB primary. For NTB
+ * secondary, simply checking the result of PSIDE_INFO
+ * register will suffice.
+ */
+ if (ndev->ntb.topo == NTB_TOPO_PRI) {
+ if ((ndev->peer_sta & AMD_LINK_UP_EVENT) ||
+ (ndev->peer_sta == 0))
+ return ret;
+ else if (ndev->peer_sta & AMD_LINK_DOWN_EVENT) {
+ /* Clear peer sideinfo register */
+ amd_clear_side_info_reg(ndev, true);
+
+ return 0;
+ }
+ } else { /* NTB_TOPO_SEC */
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static u64 amd_ntb_link_is_up(struct ntb_dev *ntb,
+ enum ntb_speed *speed,
+ enum ntb_width *width)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ int ret = 0;
+
+ if (amd_link_is_up(ndev)) {
+ if (speed)
+ *speed = NTB_LNK_STA_SPEED(ndev->lnk_sta);
+ if (width)
+ *width = NTB_LNK_STA_WIDTH(ndev->lnk_sta);
+
+ dev_dbg(&ntb->pdev->dev, "link is up.\n");
+
+ ret = 1;
+ } else {
+ if (speed)
+ *speed = NTB_SPEED_NONE;
+ if (width)
+ *width = NTB_WIDTH_NONE;
+
+ dev_dbg(&ntb->pdev->dev, "link is down.\n");
+ }
+
+ return ret;
+}
+
+static int amd_ntb_link_enable(struct ntb_dev *ntb,
+ enum ntb_speed max_speed,
+ enum ntb_width max_width)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ void __iomem *mmio = ndev->self_mmio;
+
+ /* Enable event interrupt */
+ ndev->int_mask &= ~AMD_EVENT_INTMASK;
+ writel(ndev->int_mask, mmio + AMD_INTMASK_OFFSET);
+
+ if (ndev->ntb.topo == NTB_TOPO_SEC)
+ return -EINVAL;
+ dev_dbg(&ntb->pdev->dev, "Enabling Link.\n");
+
+ return 0;
+}
+
+static int amd_ntb_link_disable(struct ntb_dev *ntb)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ void __iomem *mmio = ndev->self_mmio;
+
+ /* Disable event interrupt */
+ ndev->int_mask |= AMD_EVENT_INTMASK;
+ writel(ndev->int_mask, mmio + AMD_INTMASK_OFFSET);
+
+ if (ndev->ntb.topo == NTB_TOPO_SEC)
+ return -EINVAL;
+ dev_dbg(&ntb->pdev->dev, "Enabling Link.\n");
+
+ return 0;
+}
+
+static int amd_ntb_peer_mw_count(struct ntb_dev *ntb)
+{
+ /* The same as for inbound MWs */
+ return ntb_ndev(ntb)->mw_count;
+}
+
+static int amd_ntb_peer_mw_get_addr(struct ntb_dev *ntb, int idx,
+ phys_addr_t *base, resource_size_t *size)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ int bar;
+
+ bar = ndev_mw_to_bar(ndev, idx);
+ if (bar < 0)
+ return bar;
+
+ if (base)
+ *base = pci_resource_start(ndev->ntb.pdev, bar);
+
+ if (size)
+ *size = pci_resource_len(ndev->ntb.pdev, bar);
+
+ return 0;
+}
+
+static u64 amd_ntb_db_valid_mask(struct ntb_dev *ntb)
+{
+ return ntb_ndev(ntb)->db_valid_mask;
+}
+
+static int amd_ntb_db_vector_count(struct ntb_dev *ntb)
+{
+ return ntb_ndev(ntb)->db_count;
+}
+
+static u64 amd_ntb_db_vector_mask(struct ntb_dev *ntb, int db_vector)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+
+ if (db_vector < 0 || db_vector > ndev->db_count)
+ return 0;
+
+ return ntb_ndev(ntb)->db_valid_mask & (1ULL << db_vector);
+}
+
+static u64 amd_ntb_db_read(struct ntb_dev *ntb)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ void __iomem *mmio = ndev->self_mmio;
+
+ return (u64)readw(mmio + AMD_DBSTAT_OFFSET);
+}
+
+static int amd_ntb_db_clear(struct ntb_dev *ntb, u64 db_bits)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ void __iomem *mmio = ndev->self_mmio;
+
+ writew((u16)db_bits, mmio + AMD_DBSTAT_OFFSET);
+
+ return 0;
+}
+
+static int amd_ntb_db_set_mask(struct ntb_dev *ntb, u64 db_bits)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ void __iomem *mmio = ndev->self_mmio;
+ unsigned long flags;
+
+ if (db_bits & ~ndev->db_valid_mask)
+ return -EINVAL;
+
+ spin_lock_irqsave(&ndev->db_mask_lock, flags);
+ ndev->db_mask |= db_bits;
+ writew((u16)ndev->db_mask, mmio + AMD_DBMASK_OFFSET);
+ spin_unlock_irqrestore(&ndev->db_mask_lock, flags);
+
+ return 0;
+}
+
+static int amd_ntb_db_clear_mask(struct ntb_dev *ntb, u64 db_bits)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ void __iomem *mmio = ndev->self_mmio;
+ unsigned long flags;
+
+ if (db_bits & ~ndev->db_valid_mask)
+ return -EINVAL;
+
+ spin_lock_irqsave(&ndev->db_mask_lock, flags);
+ ndev->db_mask &= ~db_bits;
+ writew((u16)ndev->db_mask, mmio + AMD_DBMASK_OFFSET);
+ spin_unlock_irqrestore(&ndev->db_mask_lock, flags);
+
+ return 0;
+}
+
+static int amd_ntb_peer_db_set(struct ntb_dev *ntb, u64 db_bits)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ void __iomem *mmio = ndev->self_mmio;
+
+ writew((u16)db_bits, mmio + AMD_DBREQ_OFFSET);
+
+ return 0;
+}
+
+static int amd_ntb_spad_count(struct ntb_dev *ntb)
+{
+ return ntb_ndev(ntb)->spad_count;
+}
+
+static u32 amd_ntb_spad_read(struct ntb_dev *ntb, int idx)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ void __iomem *mmio = ndev->self_mmio;
+ u32 offset;
+
+ if (idx < 0 || idx >= ndev->spad_count)
+ return 0;
+
+ offset = ndev->self_spad + (idx << 2);
+ return readl(mmio + AMD_SPAD_OFFSET + offset);
+}
+
+static int amd_ntb_spad_write(struct ntb_dev *ntb,
+ int idx, u32 val)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ void __iomem *mmio = ndev->self_mmio;
+ u32 offset;
+
+ if (idx < 0 || idx >= ndev->spad_count)
+ return -EINVAL;
+
+ offset = ndev->self_spad + (idx << 2);
+ writel(val, mmio + AMD_SPAD_OFFSET + offset);
+
+ return 0;
+}
+
+static u32 amd_ntb_peer_spad_read(struct ntb_dev *ntb, int pidx, int sidx)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ void __iomem *mmio = ndev->self_mmio;
+ u32 offset;
+
+ if (sidx < 0 || sidx >= ndev->spad_count)
+ return -EINVAL;
+
+ offset = ndev->peer_spad + (sidx << 2);
+ return readl(mmio + AMD_SPAD_OFFSET + offset);
+}
+
+static int amd_ntb_peer_spad_write(struct ntb_dev *ntb, int pidx,
+ int sidx, u32 val)
+{
+ struct amd_ntb_dev *ndev = ntb_ndev(ntb);
+ void __iomem *mmio = ndev->self_mmio;
+ u32 offset;
+
+ if (sidx < 0 || sidx >= ndev->spad_count)
+ return -EINVAL;
+
+ offset = ndev->peer_spad + (sidx << 2);
+ writel(val, mmio + AMD_SPAD_OFFSET + offset);
+
+ return 0;
+}
+
+static const struct ntb_dev_ops amd_ntb_ops = {
+ .mw_count = amd_ntb_mw_count,
+ .mw_get_align = amd_ntb_mw_get_align,
+ .mw_set_trans = amd_ntb_mw_set_trans,
+ .peer_mw_count = amd_ntb_peer_mw_count,
+ .peer_mw_get_addr = amd_ntb_peer_mw_get_addr,
+ .link_is_up = amd_ntb_link_is_up,
+ .link_enable = amd_ntb_link_enable,
+ .link_disable = amd_ntb_link_disable,
+ .db_valid_mask = amd_ntb_db_valid_mask,
+ .db_vector_count = amd_ntb_db_vector_count,
+ .db_vector_mask = amd_ntb_db_vector_mask,
+ .db_read = amd_ntb_db_read,
+ .db_clear = amd_ntb_db_clear,
+ .db_set_mask = amd_ntb_db_set_mask,
+ .db_clear_mask = amd_ntb_db_clear_mask,
+ .peer_db_set = amd_ntb_peer_db_set,
+ .spad_count = amd_ntb_spad_count,
+ .spad_read = amd_ntb_spad_read,
+ .spad_write = amd_ntb_spad_write,
+ .peer_spad_read = amd_ntb_peer_spad_read,
+ .peer_spad_write = amd_ntb_peer_spad_write,
+};
+
+static void amd_ack_smu(struct amd_ntb_dev *ndev, u32 bit)
+{
+ void __iomem *mmio = ndev->self_mmio;
+ int reg;
+
+ reg = readl(mmio + AMD_SMUACK_OFFSET);
+ reg |= bit;
+ writel(reg, mmio + AMD_SMUACK_OFFSET);
+}
+
+static void amd_handle_event(struct amd_ntb_dev *ndev, int vec)
+{
+ void __iomem *mmio = ndev->self_mmio;
+ struct device *dev = &ndev->ntb.pdev->dev;
+ u32 status;
+
+ status = readl(mmio + AMD_INTSTAT_OFFSET);
+ if (!(status & AMD_EVENT_INTMASK))
+ return;
+
+ dev_dbg(dev, "status = 0x%x and vec = %d\n", status, vec);
+
+ status &= AMD_EVENT_INTMASK;
+ switch (status) {
+ case AMD_PEER_FLUSH_EVENT:
+ ndev->peer_sta |= AMD_PEER_FLUSH_EVENT;
+ dev_info(dev, "Flush is done.\n");
+ break;
+ case AMD_PEER_RESET_EVENT:
+ case AMD_LINK_DOWN_EVENT:
+ ndev->peer_sta |= status;
+ if (status == AMD_LINK_DOWN_EVENT)
+ ndev->peer_sta &= ~AMD_LINK_UP_EVENT;
+
+ amd_ack_smu(ndev, status);
+
+ /* link down first */
+ ntb_link_event(&ndev->ntb);
+ /* polling peer status */
+ schedule_delayed_work(&ndev->hb_timer, AMD_LINK_HB_TIMEOUT);
+
+ break;
+ case AMD_PEER_D3_EVENT:
+ case AMD_PEER_PMETO_EVENT:
+ case AMD_LINK_UP_EVENT:
+ ndev->peer_sta |= status;
+ if (status == AMD_LINK_UP_EVENT)
+ ndev->peer_sta &= ~AMD_LINK_DOWN_EVENT;
+ else if (status == AMD_PEER_D3_EVENT)
+ ndev->peer_sta &= ~AMD_PEER_D0_EVENT;
+
+ amd_ack_smu(ndev, status);
+
+ /* link down */
+ ntb_link_event(&ndev->ntb);
+
+ break;
+ case AMD_PEER_D0_EVENT:
+ mmio = ndev->peer_mmio;
+ status = readl(mmio + AMD_PMESTAT_OFFSET);
+ /* check if this is WAKEUP event */
+ if (status & 0x1)
+ dev_info(dev, "Wakeup is done.\n");
+
+ ndev->peer_sta |= AMD_PEER_D0_EVENT;
+ ndev->peer_sta &= ~AMD_PEER_D3_EVENT;
+ amd_ack_smu(ndev, AMD_PEER_D0_EVENT);
+
+ /* start a timer to poll link status */
+ schedule_delayed_work(&ndev->hb_timer,
+ AMD_LINK_HB_TIMEOUT);
+ break;
+ default:
+ dev_info(dev, "event status = 0x%x.\n", status);
+ break;
+ }
+
+ /* Clear the interrupt status */
+ writel(status, mmio + AMD_INTSTAT_OFFSET);
+}
+
+static void amd_handle_db_event(struct amd_ntb_dev *ndev, int vec)
+{
+ struct device *dev = &ndev->ntb.pdev->dev;
+ u64 status;
+
+ status = amd_ntb_db_read(&ndev->ntb);
+
+ dev_dbg(dev, "status = 0x%llx and vec = %d\n", status, vec);
+
+ /*
+ * Since we had reserved highest order bit of DB for signaling peer of
+ * a special event, this is the only status bit we should be concerned
+ * here now.
+ */
+ if (status & BIT(ndev->db_last_bit)) {
+ ntb_db_clear(&ndev->ntb, BIT(ndev->db_last_bit));
+ /* send link down event notification */
+ ntb_link_event(&ndev->ntb);
+
+ /*
+ * If we are here, that means the peer has signalled a special
+ * event which notifies that the peer driver has been
+ * un-loaded for some reason. Since there is a chance that the
+ * peer will load its driver again sometime, we schedule link
+ * polling routine.
+ */
+ schedule_delayed_work(&ndev->hb_timer, AMD_LINK_HB_TIMEOUT);
+ }
+}
+
+static irqreturn_t ndev_interrupt(struct amd_ntb_dev *ndev, int vec)
+{
+ dev_dbg(&ndev->ntb.pdev->dev, "vec %d\n", vec);
+
+ if (vec > (AMD_DB_CNT - 1) || (ndev->msix_vec_count == 1))
+ amd_handle_event(ndev, vec);
+
+ if (vec < AMD_DB_CNT) {
+ amd_handle_db_event(ndev, vec);
+ ntb_db_event(&ndev->ntb, vec);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ndev_vec_isr(int irq, void *dev)
+{
+ struct amd_ntb_vec *nvec = dev;
+
+ return ndev_interrupt(nvec->ndev, nvec->num);
+}
+
+static irqreturn_t ndev_irq_isr(int irq, void *dev)
+{
+ struct amd_ntb_dev *ndev = dev;
+
+ return ndev_interrupt(ndev, irq - ndev->ntb.pdev->irq);
+}
+
+static int ndev_init_isr(struct amd_ntb_dev *ndev,
+ int msix_min, int msix_max)
+{
+ struct pci_dev *pdev;
+ int rc, i, msix_count, node;
+
+ pdev = ndev->ntb.pdev;
+
+ node = dev_to_node(&pdev->dev);
+
+ ndev->db_mask = ndev->db_valid_mask;
+
+ /* Try to set up msix irq */
+ ndev->vec = kcalloc_node(msix_max, sizeof(*ndev->vec),
+ GFP_KERNEL, node);
+ if (!ndev->vec)
+ goto err_msix_vec_alloc;
+
+ ndev->msix = kcalloc_node(msix_max, sizeof(*ndev->msix),
+ GFP_KERNEL, node);
+ if (!ndev->msix)
+ goto err_msix_alloc;
+
+ for (i = 0; i < msix_max; ++i)
+ ndev->msix[i].entry = i;
+
+ msix_count = pci_enable_msix_range(pdev, ndev->msix,
+ msix_min, msix_max);
+ if (msix_count < 0)
+ goto err_msix_enable;
+
+ /* NOTE: Disable MSIX if msix count is less than 16 because of
+ * hardware limitation.
+ */
+ if (msix_count < msix_min) {
+ pci_disable_msix(pdev);
+ goto err_msix_enable;
+ }
+
+ for (i = 0; i < msix_count; ++i) {
+ ndev->vec[i].ndev = ndev;
+ ndev->vec[i].num = i;
+ rc = request_irq(ndev->msix[i].vector, ndev_vec_isr, 0,
+ "ndev_vec_isr", &ndev->vec[i]);
+ if (rc)
+ goto err_msix_request;
+ }
+
+ dev_dbg(&pdev->dev, "Using msix interrupts\n");
+ ndev->db_count = msix_min;
+ ndev->msix_vec_count = msix_max;
+ return 0;
+
+err_msix_request:
+ while (i-- > 0)
+ free_irq(ndev->msix[i].vector, &ndev->vec[i]);
+ pci_disable_msix(pdev);
+err_msix_enable:
+ kfree(ndev->msix);
+err_msix_alloc:
+ kfree(ndev->vec);
+err_msix_vec_alloc:
+ ndev->msix = NULL;
+ ndev->vec = NULL;
+
+ /* Try to set up msi irq */
+ rc = pci_enable_msi(pdev);
+ if (rc)
+ goto err_msi_enable;
+
+ rc = request_irq(pdev->irq, ndev_irq_isr, 0,
+ "ndev_irq_isr", ndev);
+ if (rc)
+ goto err_msi_request;
+
+ dev_dbg(&pdev->dev, "Using msi interrupts\n");
+ ndev->db_count = 1;
+ ndev->msix_vec_count = 1;
+ return 0;
+
+err_msi_request:
+ pci_disable_msi(pdev);
+err_msi_enable:
+
+ /* Try to set up intx irq */
+ pci_intx(pdev, 1);
+
+ rc = request_irq(pdev->irq, ndev_irq_isr, IRQF_SHARED,
+ "ndev_irq_isr", ndev);
+ if (rc)
+ goto err_intx_request;
+
+ dev_dbg(&pdev->dev, "Using intx interrupts\n");
+ ndev->db_count = 1;
+ ndev->msix_vec_count = 1;
+ return 0;
+
+err_intx_request:
+ return rc;
+}
+
+static void ndev_deinit_isr(struct amd_ntb_dev *ndev)
+{
+ struct pci_dev *pdev;
+ void __iomem *mmio = ndev->self_mmio;
+ int i;
+
+ pdev = ndev->ntb.pdev;
+
+ /* Mask all doorbell interrupts */
+ ndev->db_mask = ndev->db_valid_mask;
+ writel(ndev->db_mask, mmio + AMD_DBMASK_OFFSET);
+
+ if (ndev->msix) {
+ i = ndev->msix_vec_count;
+ while (i--)
+ free_irq(ndev->msix[i].vector, &ndev->vec[i]);
+ pci_disable_msix(pdev);
+ kfree(ndev->msix);
+ kfree(ndev->vec);
+ } else {
+ free_irq(pdev->irq, ndev);
+ if (pci_dev_msi_enabled(pdev))
+ pci_disable_msi(pdev);
+ else
+ pci_intx(pdev, 0);
+ }
+}
+
+static ssize_t ndev_debugfs_read(struct file *filp, char __user *ubuf,
+ size_t count, loff_t *offp)
+{
+ struct amd_ntb_dev *ndev;
+ void __iomem *mmio;
+ char *buf;
+ size_t buf_size;
+ ssize_t ret, off;
+ union { u64 v64; u32 v32; u16 v16; } u;
+
+ ndev = filp->private_data;
+ mmio = ndev->self_mmio;
+
+ buf_size = min(count, 0x800ul);
+
+ buf = kmalloc(buf_size, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ off = 0;
+
+ off += scnprintf(buf + off, buf_size - off,
+ "NTB Device Information:\n");
+
+ off += scnprintf(buf + off, buf_size - off,
+ "Connection Topology -\t%s\n",
+ ntb_topo_string(ndev->ntb.topo));
+
+ off += scnprintf(buf + off, buf_size - off,
+ "LNK STA -\t\t%#06x\n", ndev->lnk_sta);
+
+ if (!amd_link_is_up(ndev)) {
+ off += scnprintf(buf + off, buf_size - off,
+ "Link Status -\t\tDown\n");
+ } else {
+ off += scnprintf(buf + off, buf_size - off,
+ "Link Status -\t\tUp\n");
+ off += scnprintf(buf + off, buf_size - off,
+ "Link Speed -\t\tPCI-E Gen %u\n",
+ NTB_LNK_STA_SPEED(ndev->lnk_sta));
+ off += scnprintf(buf + off, buf_size - off,
+ "Link Width -\t\tx%u\n",
+ NTB_LNK_STA_WIDTH(ndev->lnk_sta));
+ }
+
+ off += scnprintf(buf + off, buf_size - off,
+ "Memory Window Count -\t%u\n", ndev->mw_count);
+ off += scnprintf(buf + off, buf_size - off,
+ "Scratchpad Count -\t%u\n", ndev->spad_count);
+ off += scnprintf(buf + off, buf_size - off,
+ "Doorbell Count -\t%u\n", ndev->db_count);
+ off += scnprintf(buf + off, buf_size - off,
+ "MSIX Vector Count -\t%u\n", ndev->msix_vec_count);
+
+ off += scnprintf(buf + off, buf_size - off,
+ "Doorbell Valid Mask -\t%#llx\n", ndev->db_valid_mask);
+
+ u.v32 = readl(ndev->self_mmio + AMD_DBMASK_OFFSET);
+ off += scnprintf(buf + off, buf_size - off,
+ "Doorbell Mask -\t\t\t%#06x\n", u.v32);
+
+ u.v32 = readl(mmio + AMD_DBSTAT_OFFSET);
+ off += scnprintf(buf + off, buf_size - off,
+ "Doorbell Bell -\t\t\t%#06x\n", u.v32);
+
+ off += scnprintf(buf + off, buf_size - off,
+ "\nNTB Incoming XLAT:\n");
+
+ u.v64 = read64(mmio + AMD_BAR1XLAT_OFFSET);
+ off += scnprintf(buf + off, buf_size - off,
+ "XLAT1 -\t\t%#018llx\n", u.v64);
+
+ u.v64 = read64(ndev->self_mmio + AMD_BAR23XLAT_OFFSET);
+ off += scnprintf(buf + off, buf_size - off,
+ "XLAT23 -\t\t%#018llx\n", u.v64);
+
+ u.v64 = read64(ndev->self_mmio + AMD_BAR45XLAT_OFFSET);
+ off += scnprintf(buf + off, buf_size - off,
+ "XLAT45 -\t\t%#018llx\n", u.v64);
+
+ u.v32 = readl(mmio + AMD_BAR1LMT_OFFSET);
+ off += scnprintf(buf + off, buf_size - off,
+ "LMT1 -\t\t\t%#06x\n", u.v32);
+
+ u.v64 = read64(ndev->self_mmio + AMD_BAR23LMT_OFFSET);
+ off += scnprintf(buf + off, buf_size - off,
+ "LMT23 -\t\t\t%#018llx\n", u.v64);
+
+ u.v64 = read64(ndev->self_mmio + AMD_BAR45LMT_OFFSET);
+ off += scnprintf(buf + off, buf_size - off,
+ "LMT45 -\t\t\t%#018llx\n", u.v64);
+
+ ret = simple_read_from_buffer(ubuf, count, offp, buf, off);
+ kfree(buf);
+ return ret;
+}
+
+static void ndev_init_debugfs(struct amd_ntb_dev *ndev)
+{
+ if (!debugfs_dir) {
+ ndev->debugfs_dir = NULL;
+ ndev->debugfs_info = NULL;
+ } else {
+ ndev->debugfs_dir =
+ debugfs_create_dir(pci_name(ndev->ntb.pdev),
+ debugfs_dir);
+ if (!ndev->debugfs_dir)
+ ndev->debugfs_info = NULL;
+ else
+ ndev->debugfs_info =
+ debugfs_create_file("info", S_IRUSR,
+ ndev->debugfs_dir, ndev,
+ &amd_ntb_debugfs_info);
+ }
+}
+
+static void ndev_deinit_debugfs(struct amd_ntb_dev *ndev)
+{
+ debugfs_remove_recursive(ndev->debugfs_dir);
+}
+
+static inline void ndev_init_struct(struct amd_ntb_dev *ndev,
+ struct pci_dev *pdev)
+{
+ ndev->ntb.pdev = pdev;
+ ndev->ntb.topo = NTB_TOPO_NONE;
+ ndev->ntb.ops = &amd_ntb_ops;
+ ndev->int_mask = AMD_EVENT_INTMASK;
+ spin_lock_init(&ndev->db_mask_lock);
+}
+
+static int amd_poll_link(struct amd_ntb_dev *ndev)
+{
+ void __iomem *mmio = ndev->peer_mmio;
+ u32 reg;
+
+ reg = readl(mmio + AMD_SIDEINFO_OFFSET);
+ reg &= AMD_SIDE_READY;
+
+ dev_dbg(&ndev->ntb.pdev->dev, "%s: reg_val = 0x%x.\n", __func__, reg);
+
+ ndev->cntl_sta = reg;
+
+ amd_ntb_get_link_status(ndev);
+
+ return ndev->cntl_sta;
+}
+
+static void amd_link_hb(struct work_struct *work)
+{
+ struct amd_ntb_dev *ndev = hb_ndev(work);
+
+ if (amd_poll_link(ndev))
+ ntb_link_event(&ndev->ntb);
+
+ if (!amd_link_is_up(ndev))
+ schedule_delayed_work(&ndev->hb_timer, AMD_LINK_HB_TIMEOUT);
+}
+
+static int amd_init_isr(struct amd_ntb_dev *ndev)
+{
+ return ndev_init_isr(ndev, AMD_DB_CNT, AMD_MSIX_VECTOR_CNT);
+}
+
+static void amd_set_side_info_reg(struct amd_ntb_dev *ndev, bool peer)
+{
+ void __iomem *mmio = NULL;
+ unsigned int reg;
+
+ if (peer)
+ mmio = ndev->peer_mmio;
+ else
+ mmio = ndev->self_mmio;
+
+ reg = readl(mmio + AMD_SIDEINFO_OFFSET);
+ if (!(reg & AMD_SIDE_READY)) {
+ reg |= AMD_SIDE_READY;
+ writel(reg, mmio + AMD_SIDEINFO_OFFSET);
+ }
+}
+
+static void amd_clear_side_info_reg(struct amd_ntb_dev *ndev, bool peer)
+{
+ void __iomem *mmio = NULL;
+ unsigned int reg;
+
+ if (peer)
+ mmio = ndev->peer_mmio;
+ else
+ mmio = ndev->self_mmio;
+
+ reg = readl(mmio + AMD_SIDEINFO_OFFSET);
+ if (reg & AMD_SIDE_READY) {
+ reg &= ~AMD_SIDE_READY;
+ writel(reg, mmio + AMD_SIDEINFO_OFFSET);
+ readl(mmio + AMD_SIDEINFO_OFFSET);
+ }
+}
+
+static void amd_init_side_info(struct amd_ntb_dev *ndev)
+{
+ void __iomem *mmio = ndev->self_mmio;
+ u32 ntb_ctl;
+
+ amd_set_side_info_reg(ndev, false);
+
+ ntb_ctl = readl(mmio + AMD_CNTL_OFFSET);
+ ntb_ctl |= (PMM_REG_CTL | SMM_REG_CTL);
+ writel(ntb_ctl, mmio + AMD_CNTL_OFFSET);
+}
+
+static void amd_deinit_side_info(struct amd_ntb_dev *ndev)
+{
+ void __iomem *mmio = ndev->self_mmio;
+ u32 ntb_ctl;
+
+ amd_clear_side_info_reg(ndev, false);
+
+ ntb_ctl = readl(mmio + AMD_CNTL_OFFSET);
+ ntb_ctl &= ~(PMM_REG_CTL | SMM_REG_CTL);
+ writel(ntb_ctl, mmio + AMD_CNTL_OFFSET);
+}
+
+static int amd_init_ntb(struct amd_ntb_dev *ndev)
+{
+ void __iomem *mmio = ndev->self_mmio;
+
+ ndev->mw_count = ndev->dev_data->mw_count;
+ ndev->spad_count = AMD_SPADS_CNT;
+ ndev->db_count = AMD_DB_CNT;
+
+ switch (ndev->ntb.topo) {
+ case NTB_TOPO_PRI:
+ case NTB_TOPO_SEC:
+ ndev->spad_count >>= 1;
+ if (ndev->ntb.topo == NTB_TOPO_PRI) {
+ ndev->self_spad = 0;
+ ndev->peer_spad = 0x20;
+ } else {
+ ndev->self_spad = 0x20;
+ ndev->peer_spad = 0;
+ }
+
+ INIT_DELAYED_WORK(&ndev->hb_timer, amd_link_hb);
+ schedule_delayed_work(&ndev->hb_timer, AMD_LINK_HB_TIMEOUT);
+
+ break;
+ default:
+ dev_err(&ndev->ntb.pdev->dev,
+ "AMD NTB does not support B2B mode.\n");
+ return -EINVAL;
+ }
+
+ /* Mask event interrupts */
+ writel(ndev->int_mask, mmio + AMD_INTMASK_OFFSET);
+
+ return 0;
+}
+
+static enum ntb_topo amd_get_topo(struct amd_ntb_dev *ndev)
+{
+ void __iomem *mmio = ndev->self_mmio;
+ u32 info;
+
+ info = readl(mmio + AMD_SIDEINFO_OFFSET);
+ if (info & AMD_SIDE_MASK)
+ return NTB_TOPO_SEC;
+ else
+ return NTB_TOPO_PRI;
+}
+
+static int amd_init_dev(struct amd_ntb_dev *ndev)
+{
+ void __iomem *mmio = ndev->self_mmio;
+ struct pci_dev *pdev;
+ int rc = 0;
+
+ pdev = ndev->ntb.pdev;
+
+ ndev->ntb.topo = amd_get_topo(ndev);
+ dev_dbg(&pdev->dev, "AMD NTB topo is %s\n",
+ ntb_topo_string(ndev->ntb.topo));
+
+ rc = amd_init_ntb(ndev);
+ if (rc)
+ return rc;
+
+ rc = amd_init_isr(ndev);
+ if (rc) {
+ dev_err(&pdev->dev, "fail to init isr.\n");
+ return rc;
+ }
+
+ ndev->db_valid_mask = BIT_ULL(ndev->db_count) - 1;
+ /*
+ * We reserve the highest order bit of the DB register which will
+ * be used to notify peer when the driver on this side is being
+ * un-loaded.
+ */
+ ndev->db_last_bit =
+ find_last_bit((unsigned long *)&ndev->db_valid_mask,
+ hweight64(ndev->db_valid_mask));
+ writew((u16)~BIT(ndev->db_last_bit), mmio + AMD_DBMASK_OFFSET);
+ /*
+ * Since now there is one less bit to account for, the DB count
+ * and DB mask should be adjusted accordingly.
+ */
+ ndev->db_count -= 1;
+ ndev->db_valid_mask = BIT_ULL(ndev->db_count) - 1;
+
+ /* Enable Link-Up and Link-Down event interrupts */
+ ndev->int_mask &= ~(AMD_LINK_UP_EVENT | AMD_LINK_DOWN_EVENT);
+ writel(ndev->int_mask, mmio + AMD_INTMASK_OFFSET);
+
+ return 0;
+}
+
+static void amd_deinit_dev(struct amd_ntb_dev *ndev)
+{
+ cancel_delayed_work_sync(&ndev->hb_timer);
+
+ ndev_deinit_isr(ndev);
+}
+
+static int amd_ntb_init_pci(struct amd_ntb_dev *ndev,
+ struct pci_dev *pdev)
+{
+ int rc;
+
+ pci_set_drvdata(pdev, ndev);
+
+ rc = pci_enable_device(pdev);
+ if (rc)
+ goto err_pci_enable;
+
+ rc = pci_request_regions(pdev, NTB_NAME);
+ if (rc)
+ goto err_pci_regions;
+
+ pci_set_master(pdev);
+
+ rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+ if (rc) {
+ rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+ if (rc)
+ goto err_dma_mask;
+ dev_warn(&pdev->dev, "Cannot DMA highmem\n");
+ }
+
+ ndev->self_mmio = pci_iomap(pdev, 0, 0);
+ if (!ndev->self_mmio) {
+ rc = -EIO;
+ goto err_dma_mask;
+ }
+ ndev->peer_mmio = ndev->self_mmio + AMD_PEER_OFFSET;
+
+ return 0;
+
+err_dma_mask:
+ pci_clear_master(pdev);
+ pci_release_regions(pdev);
+err_pci_regions:
+ pci_disable_device(pdev);
+err_pci_enable:
+ pci_set_drvdata(pdev, NULL);
+ return rc;
+}
+
+static void amd_ntb_deinit_pci(struct amd_ntb_dev *ndev)
+{
+ struct pci_dev *pdev = ndev->ntb.pdev;
+
+ pci_iounmap(pdev, ndev->self_mmio);
+
+ pci_clear_master(pdev);
+ pci_release_regions(pdev);
+ pci_disable_device(pdev);
+ pci_set_drvdata(pdev, NULL);
+}
+
+static int amd_ntb_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ struct amd_ntb_dev *ndev;
+ int rc, node;
+
+ node = dev_to_node(&pdev->dev);
+
+ ndev = kzalloc_node(sizeof(*ndev), GFP_KERNEL, node);
+ if (!ndev) {
+ rc = -ENOMEM;
+ goto err_ndev;
+ }
+
+ ndev->dev_data = (struct ntb_dev_data *)id->driver_data;
+
+ ndev_init_struct(ndev, pdev);
+
+ rc = amd_ntb_init_pci(ndev, pdev);
+ if (rc)
+ goto err_init_pci;
+
+ rc = amd_init_dev(ndev);
+ if (rc)
+ goto err_init_dev;
+
+ /* write side info */
+ amd_init_side_info(ndev);
+
+ amd_poll_link(ndev);
+
+ ndev_init_debugfs(ndev);
+
+ rc = ntb_register_device(&ndev->ntb);
+ if (rc)
+ goto err_register;
+
+ dev_info(&pdev->dev, "NTB device registered.\n");
+
+ return 0;
+
+err_register:
+ ndev_deinit_debugfs(ndev);
+ amd_deinit_dev(ndev);
+err_init_dev:
+ amd_ntb_deinit_pci(ndev);
+err_init_pci:
+ kfree(ndev);
+err_ndev:
+ return rc;
+}
+
+static void amd_ntb_pci_remove(struct pci_dev *pdev)
+{
+ struct amd_ntb_dev *ndev = pci_get_drvdata(pdev);
+
+ /*
+ * Clear the READY bit in SIDEINFO register before sending DB event
+ * to the peer. This will make sure that when the peer handles the
+ * DB event, it correctly reads this bit as being 0.
+ */
+ amd_deinit_side_info(ndev);
+ ntb_peer_db_set(&ndev->ntb, BIT_ULL(ndev->db_last_bit));
+ ntb_unregister_device(&ndev->ntb);
+ ndev_deinit_debugfs(ndev);
+ amd_deinit_dev(ndev);
+ amd_ntb_deinit_pci(ndev);
+ kfree(ndev);
+}
+
+static void amd_ntb_pci_shutdown(struct pci_dev *pdev)
+{
+ struct amd_ntb_dev *ndev = pci_get_drvdata(pdev);
+
+ /* Send link down notification */
+ ntb_link_event(&ndev->ntb);
+
+ amd_deinit_side_info(ndev);
+ ntb_peer_db_set(&ndev->ntb, BIT_ULL(ndev->db_last_bit));
+ ntb_unregister_device(&ndev->ntb);
+ ndev_deinit_debugfs(ndev);
+ amd_deinit_dev(ndev);
+ amd_ntb_deinit_pci(ndev);
+ kfree(ndev);
+}
+
+static const struct file_operations amd_ntb_debugfs_info = {
+ .owner = THIS_MODULE,
+ .open = simple_open,
+ .read = ndev_debugfs_read,
+};
+
+static const struct ntb_dev_data dev_data[] = {
+ { /* for device 145b */
+ .mw_count = 3,
+ .mw_idx = 1,
+ },
+ { /* for device 148b */
+ .mw_count = 2,
+ .mw_idx = 2,
+ },
+};
+
+static const struct pci_device_id amd_ntb_pci_tbl[] = {
+ { PCI_VDEVICE(AMD, 0x145b), (kernel_ulong_t)&dev_data[0] },
+ { PCI_VDEVICE(AMD, 0x148b), (kernel_ulong_t)&dev_data[1] },
+ { PCI_VDEVICE(AMD, 0x14c0), (kernel_ulong_t)&dev_data[1] },
+ { PCI_VDEVICE(AMD, 0x14c3), (kernel_ulong_t)&dev_data[1] },
+ { PCI_VDEVICE(HYGON, 0x145b), (kernel_ulong_t)&dev_data[0] },
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, amd_ntb_pci_tbl);
+
+static struct pci_driver amd_ntb_pci_driver = {
+ .name = KBUILD_MODNAME,
+ .id_table = amd_ntb_pci_tbl,
+ .probe = amd_ntb_pci_probe,
+ .remove = amd_ntb_pci_remove,
+ .shutdown = amd_ntb_pci_shutdown,
+};
+
+static int __init amd_ntb_pci_driver_init(void)
+{
+ int ret;
+ pr_info("%s %s\n", NTB_DESC, NTB_VER);
+
+ if (debugfs_initialized())
+ debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
+
+ ret = pci_register_driver(&amd_ntb_pci_driver);
+ if (ret)
+ debugfs_remove_recursive(debugfs_dir);
+
+ return ret;
+}
+module_init(amd_ntb_pci_driver_init);
+
+static void __exit amd_ntb_pci_driver_exit(void)
+{
+ pci_unregister_driver(&amd_ntb_pci_driver);
+ debugfs_remove_recursive(debugfs_dir);
+}
+module_exit(amd_ntb_pci_driver_exit);
diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.h b/drivers/ntb/hw/amd/ntb_hw_amd.h
new file mode 100644
index 000000000..5f337b157
--- /dev/null
+++ b/drivers/ntb/hw/amd/ntb_hw_amd.h
@@ -0,0 +1,223 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright (C) 2016 Advanced Micro Devices, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * BSD LICENSE
+ *
+ * Copyright (C) 2016 Advanced Micro Devices, Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copy
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of AMD Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * AMD PCIe NTB Linux driver
+ *
+ * Contact Information:
+ * Xiangliang Yu <Xiangliang.Yu@amd.com>
+ */
+
+#ifndef NTB_HW_AMD_H
+#define NTB_HW_AMD_H
+
+#include <linux/ntb.h>
+#include <linux/pci.h>
+
+#define AMD_LINK_HB_TIMEOUT msecs_to_jiffies(1000)
+#define NTB_LNK_STA_SPEED_MASK 0x000F0000
+#define NTB_LNK_STA_WIDTH_MASK 0x03F00000
+#define NTB_LNK_STA_SPEED(x) (((x) & NTB_LNK_STA_SPEED_MASK) >> 16)
+#define NTB_LNK_STA_WIDTH(x) (((x) & NTB_LNK_STA_WIDTH_MASK) >> 20)
+
+#ifndef read64
+#ifdef readq
+#define read64 readq
+#else
+#define read64 _read64
+static inline u64 _read64(void __iomem *mmio)
+{
+ u64 low, high;
+
+ low = readl(mmio);
+ high = readl(mmio + sizeof(u32));
+ return low | (high << 32);
+}
+#endif
+#endif
+
+#ifndef write64
+#ifdef writeq
+#define write64 writeq
+#else
+#define write64 _write64
+static inline void _write64(u64 val, void __iomem *mmio)
+{
+ writel(val, mmio);
+ writel(val >> 32, mmio + sizeof(u32));
+}
+#endif
+#endif
+
+enum {
+ /* AMD NTB Capability */
+ AMD_DB_CNT = 16,
+ AMD_MSIX_VECTOR_CNT = 24,
+ AMD_SPADS_CNT = 16,
+
+ /* AMD NTB register offset */
+ AMD_CNTL_OFFSET = 0x200,
+
+ /* NTB control register bits */
+ PMM_REG_CTL = BIT(21),
+ SMM_REG_CTL = BIT(20),
+ SMM_REG_ACC_PATH = BIT(18),
+ PMM_REG_ACC_PATH = BIT(17),
+ NTB_CLK_EN = BIT(16),
+
+ AMD_STA_OFFSET = 0x204,
+ AMD_PGSLV_OFFSET = 0x208,
+ AMD_SPAD_MUX_OFFSET = 0x20C,
+ AMD_SPAD_OFFSET = 0x210,
+ AMD_RSMU_HCID = 0x250,
+ AMD_RSMU_SIID = 0x254,
+ AMD_PSION_OFFSET = 0x300,
+ AMD_SSION_OFFSET = 0x330,
+ AMD_MMINDEX_OFFSET = 0x400,
+ AMD_MMDATA_OFFSET = 0x404,
+ AMD_SIDEINFO_OFFSET = 0x408,
+
+ AMD_SIDE_MASK = BIT(0),
+ AMD_SIDE_READY = BIT(1),
+
+ /* limit register */
+ AMD_ROMBARLMT_OFFSET = 0x410,
+ AMD_BAR1LMT_OFFSET = 0x414,
+ AMD_BAR23LMT_OFFSET = 0x418,
+ AMD_BAR45LMT_OFFSET = 0x420,
+ /* xlat address */
+ AMD_POMBARXLAT_OFFSET = 0x428,
+ AMD_BAR1XLAT_OFFSET = 0x430,
+ AMD_BAR23XLAT_OFFSET = 0x438,
+ AMD_BAR45XLAT_OFFSET = 0x440,
+ /* doorbell and interrupt */
+ AMD_DBFM_OFFSET = 0x450,
+ AMD_DBREQ_OFFSET = 0x454,
+ AMD_MIRRDBSTAT_OFFSET = 0x458,
+ AMD_DBMASK_OFFSET = 0x45C,
+ AMD_DBSTAT_OFFSET = 0x460,
+ AMD_INTMASK_OFFSET = 0x470,
+ AMD_INTSTAT_OFFSET = 0x474,
+
+ /* event type */
+ AMD_PEER_FLUSH_EVENT = BIT(0),
+ AMD_PEER_RESET_EVENT = BIT(1),
+ AMD_PEER_D3_EVENT = BIT(2),
+ AMD_PEER_PMETO_EVENT = BIT(3),
+ AMD_PEER_D0_EVENT = BIT(4),
+ AMD_LINK_UP_EVENT = BIT(5),
+ AMD_LINK_DOWN_EVENT = BIT(6),
+ AMD_EVENT_INTMASK = (AMD_PEER_FLUSH_EVENT |
+ AMD_PEER_RESET_EVENT | AMD_PEER_D3_EVENT |
+ AMD_PEER_PMETO_EVENT | AMD_PEER_D0_EVENT |
+ AMD_LINK_UP_EVENT | AMD_LINK_DOWN_EVENT),
+
+ AMD_PMESTAT_OFFSET = 0x480,
+ AMD_PMSGTRIG_OFFSET = 0x490,
+ AMD_LTRLATENCY_OFFSET = 0x494,
+ AMD_FLUSHTRIG_OFFSET = 0x498,
+
+ /* SMU register*/
+ AMD_SMUACK_OFFSET = 0x4A0,
+ AMD_SINRST_OFFSET = 0x4A4,
+ AMD_RSPNUM_OFFSET = 0x4A8,
+ AMD_SMU_SPADMUTEX = 0x4B0,
+ AMD_SMU_SPADOFFSET = 0x4B4,
+
+ AMD_PEER_OFFSET = 0x400,
+};
+
+struct ntb_dev_data {
+ const unsigned char mw_count;
+ const unsigned int mw_idx;
+};
+
+struct amd_ntb_dev;
+
+struct amd_ntb_vec {
+ struct amd_ntb_dev *ndev;
+ int num;
+};
+
+struct amd_ntb_dev {
+ struct ntb_dev ntb;
+
+ u32 ntb_side;
+ u32 lnk_sta;
+ u32 cntl_sta;
+ u32 peer_sta;
+
+ struct ntb_dev_data *dev_data;
+ unsigned char mw_count;
+ unsigned char spad_count;
+ unsigned char db_count;
+ unsigned char msix_vec_count;
+
+ u64 db_valid_mask;
+ u64 db_mask;
+ u64 db_last_bit;
+ u32 int_mask;
+
+ struct msix_entry *msix;
+ struct amd_ntb_vec *vec;
+
+ /* synchronize rmw access of db_mask and hw reg */
+ spinlock_t db_mask_lock;
+
+ void __iomem *self_mmio;
+ void __iomem *peer_mmio;
+ unsigned int self_spad;
+ unsigned int peer_spad;
+
+ struct delayed_work hb_timer;
+
+ struct dentry *debugfs_dir;
+ struct dentry *debugfs_info;
+};
+
+#define ntb_ndev(__ntb) container_of(__ntb, struct amd_ntb_dev, ntb)
+#define hb_ndev(__work) container_of(__work, struct amd_ntb_dev, hb_timer.work)
+
+static void amd_set_side_info_reg(struct amd_ntb_dev *ndev, bool peer);
+static void amd_clear_side_info_reg(struct amd_ntb_dev *ndev, bool peer);
+static int amd_poll_link(struct amd_ntb_dev *ndev);
+
+#endif