lkml.org 
[lkml]   [2020]   [Dec]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 09/22] misc: xlink-pcie: lh: Add core communication logic
Date
From: Srikanth Thokala <srikanth.thokala@intel.com>

Add logic to establish communication with the remote host which is through
ring buffer management and MSI/Doorbell interrupts

Reviewed-by: Mark Gross <mgross@linux.intel.com>
Signed-off-by: Srikanth Thokala <srikanth.thokala@intel.com>
---
drivers/misc/xlink-pcie/local_host/Makefile | 2 +
drivers/misc/xlink-pcie/local_host/core.c | 894 ++++++++++++++++++++
drivers/misc/xlink-pcie/local_host/core.h | 247 ++++++
drivers/misc/xlink-pcie/local_host/epf.c | 116 ++-
drivers/misc/xlink-pcie/local_host/epf.h | 26 +
drivers/misc/xlink-pcie/local_host/util.c | 375 ++++++++
drivers/misc/xlink-pcie/local_host/util.h | 70 ++
drivers/misc/xlink-pcie/local_host/xpcie.h | 65 ++
include/linux/xlink_drv_inf.h | 60 ++
9 files changed, 1847 insertions(+), 8 deletions(-)
create mode 100644 drivers/misc/xlink-pcie/local_host/core.c
create mode 100644 drivers/misc/xlink-pcie/local_host/core.h
create mode 100644 drivers/misc/xlink-pcie/local_host/util.c
create mode 100644 drivers/misc/xlink-pcie/local_host/util.h
create mode 100644 include/linux/xlink_drv_inf.h

diff --git a/drivers/misc/xlink-pcie/local_host/Makefile b/drivers/misc/xlink-pcie/local_host/Makefile
index 54fc118e2dd1..28761751d43b 100644
--- a/drivers/misc/xlink-pcie/local_host/Makefile
+++ b/drivers/misc/xlink-pcie/local_host/Makefile
@@ -1,3 +1,5 @@
obj-$(CONFIG_XLINK_PCIE_LH_DRIVER) += mxlk_ep.o
mxlk_ep-objs := epf.o
mxlk_ep-objs += dma.o
+mxlk_ep-objs += core.o
+mxlk_ep-objs += util.o
diff --git a/drivers/misc/xlink-pcie/local_host/core.c b/drivers/misc/xlink-pcie/local_host/core.c
new file mode 100644
index 000000000000..aecaaa783153
--- /dev/null
+++ b/drivers/misc/xlink-pcie/local_host/core.c
@@ -0,0 +1,894 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*****************************************************************************
+ *
+ * Intel Keem Bay XLink PCIe Driver
+ *
+ * Copyright (C) 2020 Intel Corporation
+ *
+ ****************************************************************************/
+
+#include <linux/of_reserved_mem.h>
+
+#include "epf.h"
+#include "core.h"
+#include "util.h"
+
+static struct xpcie *global_xpcie;
+
+static int rx_pool_size = SZ_32M;
+module_param(rx_pool_size, int, 0664);
+MODULE_PARM_DESC(rx_pool_size, "receiving pool size (default 32 MiB)");
+
+static int tx_pool_size = SZ_32M;
+module_param(tx_pool_size, int, 0664);
+MODULE_PARM_DESC(tx_pool_size, "transmitting pool size (default 32 MiB)");
+
+static int fragment_size = XPCIE_FRAGMENT_SIZE;
+module_param(fragment_size, int, 0664);
+MODULE_PARM_DESC(fragment_size, "transfer descriptor size (default 128 KiB)");
+
+static bool tx_pool_coherent = true;
+module_param(tx_pool_coherent, bool, 0664);
+MODULE_PARM_DESC(tx_pool_coherent,
+ "transmitting pool using coherent memory (default true)");
+
+static bool rx_pool_coherent;
+module_param(rx_pool_coherent, bool, 0664);
+MODULE_PARM_DESC(rx_pool_coherent,
+ "receiving pool using coherent memory (default false)");
+
+static struct xpcie *intel_xpcie_core_get_by_id(u32 sw_device_id)
+{
+ return (sw_device_id == xlink_sw_id) ? global_xpcie : NULL;
+}
+
+static int intel_xpcie_map_dma(struct xpcie *xpcie, struct xpcie_buf_desc *bd,
+ int direction)
+{
+ struct xpcie_epf *xpcie_epf = container_of(xpcie,
+ struct xpcie_epf, xpcie);
+ struct pci_epf *epf = xpcie_epf->epf;
+ struct device *dma_dev = epf->epc->dev.parent;
+
+ bd->phys = dma_map_single(dma_dev, bd->data, bd->length, direction);
+
+ return dma_mapping_error(dma_dev, bd->phys);
+}
+
+static void intel_xpcie_unmap_dma(struct xpcie *xpcie,
+ struct xpcie_buf_desc *bd, int direction)
+{
+ struct xpcie_epf *xpcie_epf = container_of(xpcie,
+ struct xpcie_epf, xpcie);
+ struct pci_epf *epf = xpcie_epf->epf;
+ struct device *dma_dev = epf->epc->dev.parent;
+
+ dma_unmap_single(dma_dev, bd->phys, bd->length, direction);
+}
+
+static void intel_xpcie_set_cap_txrx(struct xpcie *xpcie)
+{
+ size_t tx_len = sizeof(struct xpcie_transfer_desc) *
+ XPCIE_NUM_TX_DESCS;
+ size_t rx_len = sizeof(struct xpcie_transfer_desc) *
+ XPCIE_NUM_RX_DESCS;
+ size_t hdr_len = sizeof(struct xpcie_cap_txrx);
+ u32 start = sizeof(struct xpcie_mmio);
+ struct xpcie_cap_txrx *cap;
+ struct xpcie_cap_hdr *hdr;
+ u16 next;
+
+ next = (u16)(start + hdr_len + tx_len + rx_len);
+ intel_xpcie_iowrite32(start, xpcie->mmio + XPCIE_MMIO_CAP_OFF);
+ cap = (void *)xpcie->mmio + start;
+ memset(cap, 0, sizeof(struct xpcie_cap_txrx));
+ cap->hdr.id = XPCIE_CAP_TXRX;
+ cap->hdr.next = next;
+ cap->fragment_size = fragment_size;
+ cap->tx.ring = start + hdr_len;
+ cap->tx.ndesc = XPCIE_NUM_TX_DESCS;
+ cap->rx.ring = start + hdr_len + tx_len;
+ cap->rx.ndesc = XPCIE_NUM_RX_DESCS;
+
+ hdr = (struct xpcie_cap_hdr *)((void *)xpcie->mmio + next);
+ hdr->id = XPCIE_CAP_NULL;
+}
+
+static int intel_xpcie_set_version(struct xpcie *xpcie)
+{
+ struct xpcie_version version;
+
+ version.major = XPCIE_VERSION_MAJOR;
+ version.minor = XPCIE_VERSION_MINOR;
+ version.build = XPCIE_VERSION_BUILD;
+
+ memcpy(xpcie->mmio + XPCIE_MMIO_VERSION, &version, sizeof(version));
+
+ dev_dbg(xpcie_to_dev(xpcie), "ver: device %u.%u.%u\n",
+ version.major, version.minor, version.build);
+
+ return 0;
+}
+
+static void intel_xpcie_txrx_cleanup(struct xpcie *xpcie)
+{
+ struct xpcie_epf *xpcie_epf = container_of(xpcie,
+ struct xpcie_epf, xpcie);
+ struct device *dma_dev = xpcie_epf->epf->epc->dev.parent;
+ struct xpcie_interface *inf = &xpcie->interfaces[0];
+ struct xpcie_stream *tx = &xpcie->tx;
+ struct xpcie_stream *rx = &xpcie->rx;
+ struct xpcie_transfer_desc *td;
+ int index;
+
+ xpcie->stop_flag = true;
+ xpcie->no_tx_buffer = false;
+ inf->data_avail = true;
+ wake_up_interruptible(&xpcie->tx_waitq);
+ wake_up_interruptible(&inf->rx_waitq);
+ mutex_lock(&xpcie->wlock);
+ mutex_lock(&inf->rlock);
+
+ for (index = 0; index < rx->pipe.ndesc; index++) {
+ td = rx->pipe.tdr + index;
+ intel_xpcie_set_td_address(td, 0);
+ intel_xpcie_set_td_length(td, 0);
+ }
+ for (index = 0; index < tx->pipe.ndesc; index++) {
+ td = tx->pipe.tdr + index;
+ intel_xpcie_set_td_address(td, 0);
+ intel_xpcie_set_td_length(td, 0);
+ }
+
+ intel_xpcie_list_cleanup(&xpcie->tx_pool);
+ intel_xpcie_list_cleanup(&xpcie->rx_pool);
+
+ if (rx_pool_coherent && xpcie_epf->rx_virt) {
+ dma_free_coherent(dma_dev, xpcie_epf->rx_size,
+ xpcie_epf->rx_virt, xpcie_epf->rx_phys);
+ }
+
+ if (tx_pool_coherent && xpcie_epf->tx_virt) {
+ dma_free_coherent(dma_dev, xpcie_epf->tx_size,
+ xpcie_epf->tx_virt, xpcie_epf->tx_phys);
+ }
+
+ mutex_unlock(&inf->rlock);
+ mutex_unlock(&xpcie->wlock);
+}
+
+/*
+ * The RX/TX are named for Remote Host, in Local Host
+ * RX/TX is reversed.
+ */
+static int intel_xpcie_txrx_init(struct xpcie *xpcie,
+ struct xpcie_cap_txrx *cap)
+{
+ struct xpcie_epf *xpcie_epf = container_of(xpcie,
+ struct xpcie_epf, xpcie);
+ struct device *dma_dev = xpcie_epf->epf->epc->dev.parent;
+ struct xpcie_stream *tx = &xpcie->tx;
+ struct xpcie_stream *rx = &xpcie->rx;
+ struct xpcie_buf_desc *bd;
+ int index, ndesc, rc;
+
+ xpcie->txrx = cap;
+ xpcie->fragment_size = cap->fragment_size;
+ xpcie->stop_flag = false;
+
+ rx->pipe.ndesc = cap->tx.ndesc;
+ rx->pipe.head = &cap->tx.head;
+ rx->pipe.tail = &cap->tx.tail;
+ rx->pipe.tdr = (void *)xpcie->mmio + cap->tx.ring;
+
+ tx->pipe.ndesc = cap->rx.ndesc;
+ tx->pipe.head = &cap->rx.head;
+ tx->pipe.tail = &cap->rx.tail;
+ tx->pipe.tdr = (void *)xpcie->mmio + cap->rx.ring;
+
+ intel_xpcie_list_init(&xpcie->rx_pool);
+ rx_pool_size = roundup(rx_pool_size, xpcie->fragment_size);
+ ndesc = rx_pool_size / xpcie->fragment_size;
+
+ /* Initialize reserved memory resources */
+ rc = of_reserved_mem_device_init(dma_dev);
+ if (rc) {
+ dev_err(dma_dev, "Could not get reserved memory\n");
+ goto error;
+ }
+
+ if (rx_pool_coherent) {
+ xpcie_epf->rx_size = rx_pool_size;
+ xpcie_epf->rx_virt = dma_alloc_coherent(dma_dev,
+ xpcie_epf->rx_size,
+ &xpcie_epf->rx_phys,
+ GFP_KERNEL);
+ if (!xpcie_epf->rx_virt)
+ goto error;
+ }
+
+ for (index = 0; index < ndesc; index++) {
+ if (rx_pool_coherent) {
+ bd =
+ intel_xpcie_alloc_bd_reuse(xpcie->fragment_size,
+ xpcie_epf->rx_virt +
+ (index *
+ xpcie->fragment_size),
+ xpcie_epf->rx_phys +
+ (index *
+ xpcie->fragment_size));
+ } else {
+ bd = intel_xpcie_alloc_bd(xpcie->fragment_size);
+ }
+ if (bd) {
+ intel_xpcie_list_put(&xpcie->rx_pool, bd);
+ } else {
+ dev_err(xpcie_to_dev(xpcie),
+ "failed to alloc all rx pool descriptors\n");
+ goto error;
+ }
+ }
+
+ intel_xpcie_list_init(&xpcie->tx_pool);
+ tx_pool_size = roundup(tx_pool_size, xpcie->fragment_size);
+ ndesc = tx_pool_size / xpcie->fragment_size;
+
+ if (tx_pool_coherent) {
+ xpcie_epf->tx_size = tx_pool_size;
+ xpcie_epf->tx_virt = dma_alloc_coherent(dma_dev,
+ xpcie_epf->tx_size,
+ &xpcie_epf->tx_phys,
+ GFP_KERNEL);
+ if (!xpcie_epf->tx_virt)
+ goto error;
+ }
+
+ for (index = 0; index < ndesc; index++) {
+ if (tx_pool_coherent) {
+ bd =
+ intel_xpcie_alloc_bd_reuse(xpcie->fragment_size,
+ xpcie_epf->tx_virt +
+ (index *
+ xpcie->fragment_size),
+ xpcie_epf->tx_phys +
+ (index *
+ xpcie->fragment_size));
+ } else {
+ bd = intel_xpcie_alloc_bd(xpcie->fragment_size);
+ }
+ if (bd) {
+ intel_xpcie_list_put(&xpcie->tx_pool, bd);
+ } else {
+ dev_err(xpcie_to_dev(xpcie),
+ "failed to alloc all tx pool descriptors\n");
+ goto error;
+ }
+ }
+
+ return 0;
+
+error:
+ intel_xpcie_txrx_cleanup(xpcie);
+
+ return -ENOMEM;
+}
+
+static int intel_xpcie_discover_txrx(struct xpcie *xpcie)
+{
+ struct xpcie_cap_txrx *cap;
+ int error;
+
+ cap = intel_xpcie_cap_find(xpcie, 0, XPCIE_CAP_TXRX);
+ if (cap) {
+ error = intel_xpcie_txrx_init(xpcie, cap);
+ } else {
+ dev_err(xpcie_to_dev(xpcie), "xpcie txrx info not found\n");
+ error = -EIO;
+ }
+
+ return error;
+}
+
+static void intel_xpcie_start_tx(struct xpcie *xpcie, unsigned long delay)
+{
+ /*
+ * Use only one WQ for both Rx and Tx
+ *
+ * Synchronous Read and Writes to DDR is found to result in memory
+ * mismatch errors in stability tests due to silicon bug in A0 SoC.
+ */
+ if (xpcie->legacy_a0)
+ queue_delayed_work(xpcie->rx_wq, &xpcie->tx_event, delay);
+ else
+ queue_delayed_work(xpcie->tx_wq, &xpcie->tx_event, delay);
+}
+
+static void intel_xpcie_start_rx(struct xpcie *xpcie, unsigned long delay)
+{
+ queue_delayed_work(xpcie->rx_wq, &xpcie->rx_event, delay);
+}
+
+static void intel_xpcie_rx_event_handler(struct work_struct *work)
+{
+ struct xpcie *xpcie = container_of(work, struct xpcie, rx_event.work);
+ struct xpcie_epf *xpcie_epf = container_of(xpcie,
+ struct xpcie_epf, xpcie);
+ struct xpcie_buf_desc *bd_head, *bd_tail, *bd;
+ u32 head, tail, ndesc, length, initial_head;
+ unsigned long delay = msecs_to_jiffies(1);
+ struct xpcie_stream *rx = &xpcie->rx;
+ int descs_num = 0, chan = 0, rc;
+ struct xpcie_dma_ll_desc *desc;
+ struct xpcie_transfer_desc *td;
+ bool reset_work = false;
+ u16 interface;
+ u64 address;
+
+ if (intel_xpcie_get_host_status(xpcie) != XPCIE_STATUS_RUN)
+ return;
+
+ bd_head = NULL;
+ bd_tail = NULL;
+ ndesc = rx->pipe.ndesc;
+ tail = intel_xpcie_get_tdr_tail(&rx->pipe);
+ initial_head = intel_xpcie_get_tdr_head(&rx->pipe);
+ head = initial_head;
+
+ while (head != tail) {
+ td = rx->pipe.tdr + head;
+
+ bd = intel_xpcie_alloc_rx_bd(xpcie);
+ if (!bd) {
+ reset_work = true;
+ if (descs_num == 0) {
+ delay = msecs_to_jiffies(10);
+ goto task_exit;
+ }
+ break;
+ }
+
+ interface = intel_xpcie_get_td_interface(td);
+ length = intel_xpcie_get_td_length(td);
+ address = intel_xpcie_get_td_address(td);
+
+ bd->length = length;
+ bd->interface = interface;
+ if (!rx_pool_coherent) {
+ rc = intel_xpcie_map_dma(xpcie, bd, DMA_FROM_DEVICE);
+ if (rc) {
+ dev_err(xpcie_to_dev(xpcie),
+ "failed to map rx bd (%d)\n", rc);
+ intel_xpcie_free_rx_bd(xpcie, bd);
+ break;
+ }
+ }
+
+ desc = &xpcie_epf->rx_desc_buf[chan].virt[descs_num++];
+ desc->dma_transfer_size = length;
+ desc->dst_addr = bd->phys;
+ desc->src_addr = address;
+
+ if (bd_head)
+ bd_tail->next = bd;
+ else
+ bd_head = bd;
+ bd_tail = bd;
+
+ head = XPCIE_CIRCULAR_INC(head, ndesc);
+ }
+
+ if (descs_num == 0)
+ goto task_exit;
+
+ rc = intel_xpcie_copy_from_host_ll(xpcie, chan, descs_num);
+
+ bd = bd_head;
+ while (bd && !rx_pool_coherent) {
+ intel_xpcie_unmap_dma(xpcie, bd, DMA_FROM_DEVICE);
+ bd = bd->next;
+ }
+
+ if (rc) {
+ dev_err(xpcie_to_dev(xpcie),
+ "failed to DMA from host (%d)\n", rc);
+ intel_xpcie_free_rx_bd(xpcie, bd_head);
+ delay = msecs_to_jiffies(5);
+ reset_work = true;
+ goto task_exit;
+ }
+
+ head = initial_head;
+ bd = bd_head;
+ while (bd) {
+ td = rx->pipe.tdr + head;
+ bd_head = bd_head->next;
+ bd->next = NULL;
+
+ if (likely(bd->interface < XPCIE_NUM_INTERFACES)) {
+ intel_xpcie_set_td_status(td,
+ XPCIE_DESC_STATUS_SUCCESS);
+ intel_xpcie_add_bd_to_interface(xpcie, bd);
+ } else {
+ dev_err(xpcie_to_dev(xpcie),
+ "detected rx desc interface failure (%u)\n",
+ bd->interface);
+ intel_xpcie_set_td_status(td, XPCIE_DESC_STATUS_ERROR);
+ intel_xpcie_free_rx_bd(xpcie, bd);
+ }
+
+ bd = bd_head;
+ head = XPCIE_CIRCULAR_INC(head, ndesc);
+ }
+
+ if (head != initial_head) {
+ intel_xpcie_set_tdr_head(&rx->pipe, head);
+ intel_xpcie_raise_irq(xpcie, DATA_RECEIVED);
+ }
+
+task_exit:
+ if (reset_work)
+ intel_xpcie_start_rx(xpcie, delay);
+}
+
+static void intel_xpcie_tx_event_handler(struct work_struct *work)
+{
+ struct xpcie *xpcie = container_of(work, struct xpcie, tx_event.work);
+ struct xpcie_epf *xpcie_epf = container_of(xpcie,
+ struct xpcie_epf, xpcie);
+ struct xpcie_buf_desc *bd_head, *bd_tail, *bd;
+ struct xpcie_stream *tx = &xpcie->tx;
+ u32 head, tail, ndesc, initial_tail;
+ struct xpcie_dma_ll_desc *desc;
+ struct xpcie_transfer_desc *td;
+ int descs_num = 0, chan = 0, rc;
+ size_t buffers = 0, bytes = 0;
+ u64 address;
+
+ if (intel_xpcie_get_host_status(xpcie) != XPCIE_STATUS_RUN)
+ return;
+
+ bd_head = NULL;
+ bd_tail = NULL;
+ ndesc = tx->pipe.ndesc;
+ initial_tail = intel_xpcie_get_tdr_tail(&tx->pipe);
+ tail = initial_tail;
+ head = intel_xpcie_get_tdr_head(&tx->pipe);
+
+ /* add new entries */
+ while (XPCIE_CIRCULAR_INC(tail, ndesc) != head) {
+ bd = intel_xpcie_list_get(&xpcie->write);
+ if (!bd)
+ break;
+
+ if (!tx_pool_coherent) {
+ if (intel_xpcie_map_dma(xpcie, bd, DMA_TO_DEVICE)) {
+ dev_err(xpcie_to_dev(xpcie),
+ "dma map error bd addr %p, size %zu\n",
+ bd->data, bd->length);
+ intel_xpcie_list_put_head(&xpcie->write, bd);
+ break;
+ }
+ }
+
+ td = tx->pipe.tdr + tail;
+ address = intel_xpcie_get_td_address(td);
+
+ desc = &xpcie_epf->tx_desc_buf[chan].virt[descs_num++];
+ desc->dma_transfer_size = bd->length;
+ desc->src_addr = bd->phys;
+ desc->dst_addr = address;
+
+ if (bd_head)
+ bd_tail->next = bd;
+ else
+ bd_head = bd;
+ bd_tail = bd;
+
+ tail = XPCIE_CIRCULAR_INC(tail, ndesc);
+ }
+
+ if (descs_num == 0)
+ goto task_exit;
+
+ rc = intel_xpcie_copy_to_host_ll(xpcie, chan, descs_num);
+
+ tail = initial_tail;
+ bd = bd_head;
+ while (bd) {
+ if (!tx_pool_coherent)
+ intel_xpcie_unmap_dma(xpcie, bd, DMA_TO_DEVICE);
+
+ if (rc) {
+ bd = bd->next;
+ continue;
+ }
+
+ td = tx->pipe.tdr + tail;
+ intel_xpcie_set_td_status(td, XPCIE_DESC_STATUS_SUCCESS);
+ intel_xpcie_set_td_length(td, bd->length);
+ intel_xpcie_set_td_interface(td, bd->interface);
+
+ bd = bd->next;
+ tail = XPCIE_CIRCULAR_INC(tail, ndesc);
+ }
+
+ if (rc) {
+ dev_err(xpcie_to_dev(xpcie),
+ "failed to DMA to host (%d)\n", rc);
+ intel_xpcie_list_put_head(&xpcie->write, bd_head);
+ return;
+ }
+
+ intel_xpcie_free_tx_bd(xpcie, bd_head);
+
+ if (intel_xpcie_get_tdr_tail(&tx->pipe) != tail) {
+ intel_xpcie_set_tdr_tail(&tx->pipe, tail);
+ intel_xpcie_raise_irq(xpcie, DATA_SENT);
+ }
+
+task_exit:
+ intel_xpcie_list_info(&xpcie->write, &bytes, &buffers);
+ if (buffers) {
+ xpcie->tx_pending = true;
+ head = intel_xpcie_get_tdr_head(&tx->pipe);
+ if (XPCIE_CIRCULAR_INC(tail, ndesc) != head)
+ intel_xpcie_start_tx(xpcie, 0);
+ } else {
+ xpcie->tx_pending = false;
+ }
+}
+
+static irqreturn_t intel_xpcie_core_irq_cb(int irq, void *args)
+{
+ struct xpcie *xpcie = args;
+
+ if (intel_xpcie_get_doorbell(xpcie, TO_DEVICE, DATA_SENT)) {
+ intel_xpcie_set_doorbell(xpcie, TO_DEVICE, DATA_SENT, 0);
+ intel_xpcie_start_rx(xpcie, 0);
+ }
+ if (intel_xpcie_get_doorbell(xpcie, TO_DEVICE, DATA_RECEIVED)) {
+ intel_xpcie_set_doorbell(xpcie, TO_DEVICE, DATA_RECEIVED, 0);
+ if (xpcie->tx_pending)
+ intel_xpcie_start_tx(xpcie, 0);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int intel_xpcie_events_init(struct xpcie *xpcie)
+{
+ xpcie->rx_wq = alloc_ordered_workqueue(XPCIE_DRIVER_NAME,
+ WQ_MEM_RECLAIM | WQ_HIGHPRI);
+ if (!xpcie->rx_wq) {
+ dev_err(xpcie_to_dev(xpcie), "failed to allocate workqueue\n");
+ return -ENOMEM;
+ }
+
+ if (!xpcie->legacy_a0) {
+ xpcie->tx_wq = alloc_ordered_workqueue(XPCIE_DRIVER_NAME,
+ WQ_MEM_RECLAIM |
+ WQ_HIGHPRI);
+ if (!xpcie->tx_wq) {
+ dev_err(xpcie_to_dev(xpcie),
+ "failed to allocate workqueue\n");
+ destroy_workqueue(xpcie->rx_wq);
+ return -ENOMEM;
+ }
+ }
+
+ INIT_DELAYED_WORK(&xpcie->rx_event, intel_xpcie_rx_event_handler);
+ INIT_DELAYED_WORK(&xpcie->tx_event, intel_xpcie_tx_event_handler);
+
+ return 0;
+}
+
+static void intel_xpcie_events_cleanup(struct xpcie *xpcie)
+{
+ cancel_delayed_work_sync(&xpcie->rx_event);
+ cancel_delayed_work_sync(&xpcie->tx_event);
+
+ destroy_workqueue(xpcie->rx_wq);
+ if (!xpcie->legacy_a0)
+ destroy_workqueue(xpcie->tx_wq);
+}
+
+int intel_xpcie_core_init(struct xpcie *xpcie)
+{
+ int error;
+
+ global_xpcie = xpcie;
+
+ intel_xpcie_set_version(xpcie);
+ intel_xpcie_set_cap_txrx(xpcie);
+
+ error = intel_xpcie_events_init(xpcie);
+ if (error)
+ return error;
+
+ error = intel_xpcie_discover_txrx(xpcie);
+ if (error)
+ goto error_txrx;
+
+ intel_xpcie_interfaces_init(xpcie);
+
+ intel_xpcie_set_doorbell(xpcie, TO_DEVICE, DATA_SENT, 0);
+ intel_xpcie_set_doorbell(xpcie, TO_DEVICE, DATA_RECEIVED, 0);
+ intel_xpcie_set_doorbell(xpcie, TO_DEVICE, DEV_EVENT, NO_OP);
+ intel_xpcie_set_doorbell(xpcie, FROM_DEVICE, DATA_SENT, 0);
+ intel_xpcie_set_doorbell(xpcie, FROM_DEVICE, DATA_RECEIVED, 0);
+ intel_xpcie_set_doorbell(xpcie, FROM_DEVICE, DEV_EVENT, NO_OP);
+
+ intel_xpcie_register_host_irq(xpcie, intel_xpcie_core_irq_cb);
+
+ return 0;
+
+error_txrx:
+ intel_xpcie_events_cleanup(xpcie);
+
+ return error;
+}
+
+void intel_xpcie_core_cleanup(struct xpcie *xpcie)
+{
+ if (xpcie->status == XPCIE_STATUS_RUN) {
+ intel_xpcie_events_cleanup(xpcie);
+ intel_xpcie_interfaces_cleanup(xpcie);
+ intel_xpcie_txrx_cleanup(xpcie);
+ }
+}
+
+int intel_xpcie_core_read(struct xpcie *xpcie, void *buffer,
+ size_t *length, u32 timeout_ms)
+{
+ long jiffies_timeout = (long)msecs_to_jiffies(timeout_ms);
+ struct xpcie_interface *inf = &xpcie->interfaces[0];
+ unsigned long jiffies_start = jiffies;
+ struct xpcie_buf_desc *bd;
+ long jiffies_passed = 0;
+ size_t len, remaining;
+ int ret;
+
+ if (*length == 0)
+ return -EINVAL;
+
+ if (xpcie->status != XPCIE_STATUS_RUN)
+ return -ENODEV;
+
+ len = *length;
+ remaining = len;
+ *length = 0;
+
+ ret = mutex_lock_interruptible(&inf->rlock);
+ if (ret < 0)
+ return -EINTR;
+
+ do {
+ while (!inf->data_avail) {
+ mutex_unlock(&inf->rlock);
+ if (timeout_ms == 0) {
+ ret =
+ wait_event_interruptible(inf->rx_waitq,
+ inf->data_avail);
+ } else {
+ ret =
+ wait_event_interruptible_timeout(inf->rx_waitq,
+ inf->data_avail,
+ jiffies_timeout -
+ jiffies_passed);
+ if (ret == 0)
+ return -ETIME;
+ }
+ if (ret < 0 || xpcie->stop_flag)
+ return -EINTR;
+
+ ret = mutex_lock_interruptible(&inf->rlock);
+ if (ret < 0)
+ return -EINTR;
+ }
+
+ bd = (inf->partial_read) ? inf->partial_read :
+ intel_xpcie_list_get(&inf->read);
+
+ while (remaining && bd) {
+ size_t bcopy;
+
+ bcopy = min(remaining, bd->length);
+ memcpy(buffer, bd->data, bcopy);
+
+ buffer += bcopy;
+ remaining -= bcopy;
+ bd->data += bcopy;
+ bd->length -= bcopy;
+
+ if (bd->length == 0) {
+ intel_xpcie_free_rx_bd(xpcie, bd);
+ bd = intel_xpcie_list_get(&inf->read);
+ }
+ }
+
+ /* save for next time */
+ inf->partial_read = bd;
+
+ if (!bd)
+ inf->data_avail = false;
+
+ *length = len - remaining;
+
+ jiffies_passed = (long)jiffies - (long)jiffies_start;
+ } while (remaining > 0 && (jiffies_passed < jiffies_timeout ||
+ timeout_ms == 0));
+
+ mutex_unlock(&inf->rlock);
+
+ return 0;
+}
+
+int intel_xpcie_core_write(struct xpcie *xpcie, void *buffer,
+ size_t *length, u32 timeout_ms)
+{
+ long jiffies_timeout = (long)msecs_to_jiffies(timeout_ms);
+ struct xpcie_interface *inf = &xpcie->interfaces[0];
+ unsigned long jiffies_start = jiffies;
+ struct xpcie_buf_desc *bd, *head;
+ long jiffies_passed = 0;
+ size_t remaining, len;
+ int ret;
+
+ if (*length == 0)
+ return -EINVAL;
+
+ if (xpcie->status != XPCIE_STATUS_RUN)
+ return -ENODEV;
+
+ if (intel_xpcie_get_host_status(xpcie) != XPCIE_STATUS_RUN)
+ return -ENODEV;
+
+ len = *length;
+ remaining = len;
+ *length = 0;
+
+ ret = mutex_lock_interruptible(&xpcie->wlock);
+ if (ret < 0)
+ return -EINTR;
+
+ do {
+ bd = intel_xpcie_alloc_tx_bd(xpcie);
+ head = bd;
+ while (!head) {
+ mutex_unlock(&xpcie->wlock);
+ if (timeout_ms == 0) {
+ ret =
+ wait_event_interruptible(xpcie->tx_waitq,
+ !xpcie->no_tx_buffer);
+ } else {
+ ret =
+ wait_event_interruptible_timeout(xpcie->tx_waitq,
+ !xpcie->no_tx_buffer,
+ jiffies_timeout -
+ jiffies_passed);
+ if (ret == 0)
+ return -ETIME;
+ }
+ if (ret < 0 || xpcie->stop_flag)
+ return -EINTR;
+
+ ret = mutex_lock_interruptible(&xpcie->wlock);
+ if (ret < 0)
+ return -EINTR;
+
+ bd = intel_xpcie_alloc_tx_bd(xpcie);
+ head = bd;
+ }
+
+ while (remaining && bd) {
+ size_t bcopy;
+
+ bcopy = min(bd->length, remaining);
+ memcpy(bd->data, buffer, bcopy);
+
+ buffer += bcopy;
+ remaining -= bcopy;
+ bd->length = bcopy;
+ bd->interface = inf->id;
+
+ if (remaining) {
+ bd->next = intel_xpcie_alloc_tx_bd(xpcie);
+ bd = bd->next;
+ }
+ }
+
+ intel_xpcie_list_put(&inf->xpcie->write, head);
+ intel_xpcie_start_tx(xpcie, 0);
+
+ *length = len - remaining;
+
+ jiffies_passed = (long)jiffies - (long)jiffies_start;
+ } while (remaining > 0 && (jiffies_passed < jiffies_timeout ||
+ timeout_ms == 0));
+
+ mutex_unlock(&xpcie->wlock);
+
+ return 0;
+}
+
+int intel_xpcie_get_device_status_by_id(u32 id, u32 *status)
+{
+ struct xpcie *xpcie = intel_xpcie_core_get_by_id(id);
+
+ if (!xpcie)
+ return -ENODEV;
+
+ *status = xpcie->status;
+
+ return 0;
+}
+
+u32 intel_xpcie_get_device_num(u32 *id_list)
+{
+ u32 num_devices = 0;
+
+ if (xlink_sw_id) {
+ num_devices = 1;
+ *id_list = xlink_sw_id;
+ }
+
+ return num_devices;
+}
+
+int intel_xpcie_get_device_name_by_id(u32 id,
+ char *device_name, size_t name_size)
+{
+ struct xpcie *xpcie;
+
+ xpcie = intel_xpcie_core_get_by_id(id);
+ if (!xpcie)
+ return -ENODEV;
+
+ memset(device_name, 0, name_size);
+ if (name_size > strlen(XPCIE_DRIVER_NAME))
+ name_size = strlen(XPCIE_DRIVER_NAME);
+ memcpy(device_name, XPCIE_DRIVER_NAME, name_size);
+
+ return 0;
+}
+
+int intel_xpcie_pci_connect_device(u32 id)
+{
+ struct xpcie *xpcie;
+
+ xpcie = intel_xpcie_core_get_by_id(id);
+ if (!xpcie)
+ return -ENODEV;
+
+ if (xpcie->status != XPCIE_STATUS_RUN)
+ return -EIO;
+
+ return 0;
+}
+
+int intel_xpcie_pci_read(u32 id, void *data, size_t *size, u32 timeout)
+{
+ struct xpcie *xpcie;
+
+ xpcie = intel_xpcie_core_get_by_id(id);
+ if (!xpcie)
+ return -ENODEV;
+
+ return intel_xpcie_core_read(xpcie, data, size, timeout);
+}
+
+int intel_xpcie_pci_write(u32 id, void *data, size_t *size, u32 timeout)
+{
+ struct xpcie *xpcie;
+
+ xpcie = intel_xpcie_core_get_by_id(id);
+ if (!xpcie)
+ return -ENODEV;
+
+ return intel_xpcie_core_write(xpcie, data, size, timeout);
+}
+
+int intel_xpcie_pci_reset_device(u32 id)
+{
+ return 0;
+}
diff --git a/drivers/misc/xlink-pcie/local_host/core.h b/drivers/misc/xlink-pcie/local_host/core.h
new file mode 100644
index 000000000000..84985ef41a64
--- /dev/null
+++ b/drivers/misc/xlink-pcie/local_host/core.h
@@ -0,0 +1,247 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*****************************************************************************
+ *
+ * Intel Keem Bay XLink PCIe Driver
+ *
+ * Copyright (C) 2020 Intel Corporation
+ *
+ ****************************************************************************/
+
+#ifndef XPCIE_CORE_HEADER_
+#define XPCIE_CORE_HEADER_
+
+#include <linux/io.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/mempool.h>
+#include <linux/dma-mapping.h>
+#include <linux/cache.h>
+#include <linux/wait.h>
+
+#include <linux/xlink_drv_inf.h>
+
+/* Number of interfaces to statically allocate resources for */
+#define XPCIE_NUM_INTERFACES (1)
+
+/* max should be always power of '2' */
+#define XPCIE_CIRCULAR_INC(val, max) (((val) + 1) & ((max) - 1))
+
+#define XPCIE_FRAGMENT_SIZE SZ_128K
+
+/* Status encoding of the transfer descriptors */
+#define XPCIE_DESC_STATUS_SUCCESS (0)
+#define XPCIE_DESC_STATUS_ERROR (0xFFFF)
+
+/* Layout transfer descriptors used by device and host */
+struct xpcie_transfer_desc {
+ u64 address;
+ u32 length;
+ u16 status;
+ u16 interface;
+} __packed;
+
+struct xpcie_pipe {
+ u32 old;
+ u32 ndesc;
+ u32 *head;
+ u32 *tail;
+ struct xpcie_transfer_desc *tdr;
+};
+
+struct xpcie_buf_desc {
+ struct xpcie_buf_desc *next;
+ void *head;
+ dma_addr_t phys;
+ size_t true_len;
+ void *data;
+ size_t length;
+ int interface;
+ bool own_mem;
+};
+
+struct xpcie_stream {
+ size_t frag;
+ struct xpcie_pipe pipe;
+};
+
+struct xpcie_list {
+ spinlock_t lock; /* list lock */
+ size_t bytes;
+ size_t buffers;
+ struct xpcie_buf_desc *head;
+ struct xpcie_buf_desc *tail;
+};
+
+struct xpcie_interface {
+ int id;
+ struct xpcie *xpcie;
+ struct mutex rlock; /* read lock */
+ struct xpcie_list read;
+ struct xpcie_buf_desc *partial_read;
+ bool data_avail;
+ wait_queue_head_t rx_waitq;
+};
+
+struct xpcie_debug_stats {
+ struct {
+ size_t cnts;
+ size_t bytes;
+ } tx_krn, rx_krn, tx_usr, rx_usr;
+ size_t send_ints;
+ size_t interrupts;
+ size_t rx_event_runs;
+ size_t tx_event_runs;
+};
+
+/* Defined capabilities located in mmio space */
+#define XPCIE_CAP_NULL (0)
+#define XPCIE_CAP_TXRX (1)
+
+#define XPCIE_CAP_TTL (32)
+#define XPCIE_CAP_HDR_ID (offsetof(struct xpcie_cap_hdr, id))
+#define XPCIE_CAP_HDR_NEXT (offsetof(struct xpcie_cap_hdr, next))
+
+/* Header at the beginning of each capability to define and link to next */
+struct xpcie_cap_hdr {
+ u16 id;
+ u16 next;
+} __packed;
+
+struct xpcie_cap_pipe {
+ u32 ring;
+ u32 ndesc;
+ u32 head;
+ u32 tail;
+} __packed;
+
+/* Transmit and Receive capability */
+struct xpcie_cap_txrx {
+ struct xpcie_cap_hdr hdr;
+ u32 fragment_size;
+ struct xpcie_cap_pipe tx;
+ struct xpcie_cap_pipe rx;
+} __packed;
+
+static inline u64 _ioread64(void __iomem *addr)
+{
+ u64 low, high;
+
+ low = ioread32(addr);
+ high = ioread32(addr + sizeof(u32));
+
+ return low | (high << 32);
+}
+
+static inline void _iowrite64(u64 value, void __iomem *addr)
+{
+ iowrite32(value, addr);
+ iowrite32(value >> 32, addr + sizeof(u32));
+}
+
+#define intel_xpcie_iowrite64(value, addr) \
+ _iowrite64(value, (void __iomem *)addr)
+#define intel_xpcie_iowrite32(value, addr) \
+ iowrite32(value, (void __iomem *)addr)
+#define intel_xpcie_iowrite16(value, addr) \
+ iowrite16(value, (void __iomem *)addr)
+#define intel_xpcie_iowrite8(value, addr) \
+ iowrite8(value, (void __iomem *)addr)
+#define intel_xpcie_ioread64(addr) \
+ _ioread64((void __iomem *)addr)
+#define intel_xpcie_ioread32(addr) \
+ ioread32((void __iomem *)addr)
+#define intel_xpcie_ioread16(addr) \
+ ioread16((void __iomem *)addr)
+#define intel_xpcie_ioread8(addr) \
+ ioread8((void __iomem *)addr)
+
+static inline
+void intel_xpcie_set_td_address(struct xpcie_transfer_desc *td, u64 address)
+{
+ intel_xpcie_iowrite64(address, &td->address);
+}
+
+static inline
+u64 intel_xpcie_get_td_address(struct xpcie_transfer_desc *td)
+{
+ return intel_xpcie_ioread64(&td->address);
+}
+
+static inline
+void intel_xpcie_set_td_length(struct xpcie_transfer_desc *td, u32 length)
+{
+ intel_xpcie_iowrite32(length, &td->length);
+}
+
+static inline
+u32 intel_xpcie_get_td_length(struct xpcie_transfer_desc *td)
+{
+ return intel_xpcie_ioread32(&td->length);
+}
+
+static inline
+void intel_xpcie_set_td_interface(struct xpcie_transfer_desc *td, u16 interface)
+{
+ intel_xpcie_iowrite16(interface, &td->interface);
+}
+
+static inline
+u16 intel_xpcie_get_td_interface(struct xpcie_transfer_desc *td)
+{
+ return intel_xpcie_ioread16(&td->interface);
+}
+
+static inline
+void intel_xpcie_set_td_status(struct xpcie_transfer_desc *td, u16 status)
+{
+ intel_xpcie_iowrite16(status, &td->status);
+}
+
+static inline
+u16 intel_xpcie_get_td_status(struct xpcie_transfer_desc *td)
+{
+ return intel_xpcie_ioread16(&td->status);
+}
+
+static inline
+void intel_xpcie_set_tdr_head(struct xpcie_pipe *p, u32 head)
+{
+ intel_xpcie_iowrite32(head, p->head);
+}
+
+static inline
+u32 intel_xpcie_get_tdr_head(struct xpcie_pipe *p)
+{
+ return intel_xpcie_ioread32(p->head);
+}
+
+static inline
+void intel_xpcie_set_tdr_tail(struct xpcie_pipe *p, u32 tail)
+{
+ intel_xpcie_iowrite32(tail, p->tail);
+}
+
+static inline
+u32 intel_xpcie_get_tdr_tail(struct xpcie_pipe *p)
+{
+ return intel_xpcie_ioread32(p->tail);
+}
+
+int intel_xpcie_core_init(struct xpcie *xpcie);
+void intel_xpcie_core_cleanup(struct xpcie *xpcie);
+int intel_xpcie_core_read(struct xpcie *xpcie, void *buffer, size_t *length,
+ u32 timeout_ms);
+int intel_xpcie_core_write(struct xpcie *xpcie, void *buffer, size_t *length,
+ u32 timeout_ms);
+u32 intel_xpcie_get_device_num(u32 *id_list);
+struct xpcie_dev *intel_xpcie_get_device_by_id(u32 id);
+int intel_xpcie_get_device_name_by_id(u32 id, char *device_name,
+ size_t name_size);
+int intel_xpcie_get_device_status_by_id(u32 id, u32 *status);
+int intel_xpcie_pci_connect_device(u32 id);
+int intel_xpcie_pci_read(u32 id, void *data, size_t *size, u32 timeout);
+int intel_xpcie_pci_write(u32 id, void *data, size_t *size, u32 timeout);
+int intel_xpcie_pci_reset_device(u32 id);
+#endif /* XPCIE_CORE_HEADER_ */
diff --git a/drivers/misc/xlink-pcie/local_host/epf.c b/drivers/misc/xlink-pcie/local_host/epf.c
index fc29180aa508..f334d4749cce 100644
--- a/drivers/misc/xlink-pcie/local_host/epf.c
+++ b/drivers/misc/xlink-pcie/local_host/epf.c
@@ -9,6 +9,7 @@

#include <linux/of.h>
#include <linux/platform_device.h>
+#include <linux/reboot.h>

#include "epf.h"

@@ -21,6 +22,12 @@
#define PCIE_REGS_PCIE_ERR_INTR_FLAGS 0x24
#define LINK_REQ_RST_FLG BIT(15)

+#define PCIE_REGS_PCIE_SYS_CFG_CORE 0x7C
+#define PCIE_CFG_PBUS_NUM_OFFSET 8
+#define PCIE_CFG_PBUS_NUM_MASK 0xFF
+#define PCIE_CFG_PBUS_DEV_NUM_OFFSET 16
+#define PCIE_CFG_PBUS_DEV_NUM_MASK 0x1F
+
static struct pci_epf_header xpcie_header = {
.vendorid = PCI_VENDOR_ID_INTEL,
.deviceid = PCI_DEVICE_ID_INTEL_KEEMBAY,
@@ -37,6 +44,45 @@ static const struct pci_epf_device_id xpcie_epf_ids[] = {
{},
};

+u32 xlink_sw_id;
+
+int intel_xpcie_copy_from_host_ll(struct xpcie *xpcie, int chan, int descs_num)
+{
+ struct xpcie_epf *xpcie_epf = container_of(xpcie,
+ struct xpcie_epf, xpcie);
+ struct pci_epf *epf = xpcie_epf->epf;
+
+ return intel_xpcie_ep_dma_read_ll(epf, chan, descs_num);
+}
+
+int intel_xpcie_copy_to_host_ll(struct xpcie *xpcie, int chan, int descs_num)
+{
+ struct xpcie_epf *xpcie_epf = container_of(xpcie,
+ struct xpcie_epf, xpcie);
+ struct pci_epf *epf = xpcie_epf->epf;
+
+ return intel_xpcie_ep_dma_write_ll(epf, chan, descs_num);
+}
+
+void intel_xpcie_register_host_irq(struct xpcie *xpcie, irq_handler_t func)
+{
+ struct xpcie_epf *xpcie_epf = container_of(xpcie,
+ struct xpcie_epf, xpcie);
+
+ xpcie_epf->core_irq_callback = func;
+}
+
+int intel_xpcie_raise_irq(struct xpcie *xpcie, enum xpcie_doorbell_type type)
+{
+ struct xpcie_epf *xpcie_epf = container_of(xpcie,
+ struct xpcie_epf, xpcie);
+ struct pci_epf *epf = xpcie_epf->epf;
+
+ intel_xpcie_set_doorbell(xpcie, FROM_DEVICE, type, 1);
+
+ return pci_epc_raise_irq(epf->epc, epf->func_no, PCI_EPC_IRQ_MSI, 1);
+}
+
static irqreturn_t intel_xpcie_err_interrupt(int irq, void *args)
{
struct xpcie_epf *xpcie_epf;
@@ -57,6 +103,7 @@ static irqreturn_t intel_xpcie_host_interrupt(int irq, void *args)
{
struct xpcie_epf *xpcie_epf;
struct xpcie *xpcie = args;
+ u8 event;
u32 val;

xpcie_epf = container_of(xpcie, struct xpcie_epf, xpcie);
@@ -64,6 +111,18 @@ static irqreturn_t intel_xpcie_host_interrupt(int irq, void *args)
if (val & LBC_CII_EVENT_FLAG) {
iowrite32(LBC_CII_EVENT_FLAG,
xpcie_epf->apb_base + PCIE_REGS_PCIE_INTR_FLAGS);
+
+ event = intel_xpcie_get_doorbell(xpcie, TO_DEVICE, DEV_EVENT);
+ if (unlikely(event != NO_OP)) {
+ intel_xpcie_set_doorbell(xpcie, TO_DEVICE,
+ DEV_EVENT, NO_OP);
+ if (event == REQUEST_RESET)
+ orderly_reboot();
+ return IRQ_HANDLED;
+ }
+
+ if (likely(xpcie_epf->core_irq_callback))
+ xpcie_epf->core_irq_callback(irq, xpcie);
}

return IRQ_HANDLED;
@@ -269,6 +328,7 @@ static int intel_xpcie_epf_bind(struct pci_epf *epf)
struct xpcie_epf *xpcie_epf = epf_get_drvdata(epf);
const struct pci_epc_features *features;
struct pci_epc *epc = epf->epc;
+ u32 bus_num, dev_num;
struct device *dev;
size_t align = SZ_16K;
int ret;
@@ -300,12 +360,12 @@ static int intel_xpcie_epf_bind(struct pci_epf *epf)

if (!strcmp(xpcie_epf->stepping, "A0")) {
xpcie_epf->xpcie.legacy_a0 = true;
- iowrite32(1, (void __iomem *)xpcie_epf->xpcie.mmio +
- XPCIE_MMIO_LEGACY_A0);
+ intel_xpcie_iowrite32(1, xpcie_epf->xpcie.mmio +
+ XPCIE_MMIO_LEGACY_A0);
} else {
xpcie_epf->xpcie.legacy_a0 = false;
- iowrite32(0, (void __iomem *)xpcie_epf->xpcie.mmio +
- XPCIE_MMIO_LEGACY_A0);
+ intel_xpcie_iowrite32(0, xpcie_epf->xpcie.mmio +
+ XPCIE_MMIO_LEGACY_A0);
}

/* Enable interrupt */
@@ -330,13 +390,46 @@ static int intel_xpcie_epf_bind(struct pci_epf *epf)
ret = intel_xpcie_ep_dma_init(epf);
if (ret) {
dev_err(&epf->dev, "DMA initialization failed\n");
- goto err_free_err_irq;
+ goto err_cleanup_bars;
}

+ intel_xpcie_set_device_status(&xpcie_epf->xpcie, XPCIE_STATUS_READY);
+
+ ret = ioread32(xpcie_epf->apb_base + PCIE_REGS_PCIE_SYS_CFG_CORE);
+ bus_num = (ret >> PCIE_CFG_PBUS_NUM_OFFSET) & PCIE_CFG_PBUS_NUM_MASK;
+ dev_num = (ret >> PCIE_CFG_PBUS_DEV_NUM_OFFSET) &
+ PCIE_CFG_PBUS_DEV_NUM_MASK;
+
+ xlink_sw_id = FIELD_PREP(XLINK_DEV_INF_TYPE_MASK,
+ XLINK_DEV_INF_PCIE) |
+ FIELD_PREP(XLINK_DEV_PHYS_ID_MASK,
+ bus_num << 8 | dev_num) |
+ FIELD_PREP(XLINK_DEV_TYPE_MASK, XLINK_DEV_TYPE_KMB) |
+ FIELD_PREP(XLINK_DEV_PCIE_ID_MASK, XLINK_DEV_PCIE_0) |
+ FIELD_PREP(XLINK_DEV_FUNC_MASK, XLINK_DEV_FUNC_VPU);
+
+ ret = intel_xpcie_core_init(&xpcie_epf->xpcie);
+ if (ret) {
+ dev_err(&epf->dev, "Core component configuration failed\n");
+ goto err_uninit_dma;
+ }
+
+ intel_xpcie_iowrite32(XPCIE_STATUS_UNINIT,
+ xpcie_epf->xpcie.mmio + XPCIE_MMIO_HOST_STATUS);
+ intel_xpcie_set_device_status(&xpcie_epf->xpcie, XPCIE_STATUS_RUN);
+ intel_xpcie_set_doorbell(&xpcie_epf->xpcie, FROM_DEVICE,
+ DEV_EVENT, NO_OP);
+ memcpy(xpcie_epf->xpcie.mmio + XPCIE_MMIO_MAGIC_OFF, XPCIE_MAGIC_YOCTO,
+ strlen(XPCIE_MAGIC_YOCTO));
+
return 0;

-err_free_err_irq:
- free_irq(xpcie_epf->irq_err, &xpcie_epf->xpcie);
+err_uninit_dma:
+ intel_xpcie_set_device_status(&xpcie_epf->xpcie, XPCIE_STATUS_ERROR);
+ memcpy(xpcie_epf->xpcie.mmio + XPCIE_MMIO_MAGIC_OFF, XPCIE_MAGIC_YOCTO,
+ strlen(XPCIE_MAGIC_YOCTO));
+
+ intel_xpcie_ep_dma_uninit(epf);

err_cleanup_bars:
intel_xpcie_cleanup_bars(epf);
@@ -346,8 +439,12 @@ static int intel_xpcie_epf_bind(struct pci_epf *epf)

static void intel_xpcie_epf_unbind(struct pci_epf *epf)
{
+ struct xpcie_epf *xpcie_epf = epf_get_drvdata(epf);
struct pci_epc *epc = epf->epc;

+ intel_xpcie_core_cleanup(&xpcie_epf->xpcie);
+ intel_xpcie_set_device_status(&xpcie_epf->xpcie, XPCIE_STATUS_READY);
+
intel_xpcie_ep_dma_uninit(epf);

pci_epc_stop(epc);
@@ -379,8 +476,11 @@ static void intel_xpcie_epf_shutdown(struct device *dev)
xpcie_epf = epf_get_drvdata(epf);

/* Notify host in case PCIe hot plug not supported */
- if (xpcie_epf)
+ if (xpcie_epf && xpcie_epf->xpcie.status == XPCIE_STATUS_RUN) {
+ intel_xpcie_set_doorbell(&xpcie_epf->xpcie, FROM_DEVICE,
+ DEV_EVENT, DEV_SHUTDOWN);
pci_epc_raise_irq(epf->epc, epf->func_no, PCI_EPC_IRQ_MSI, 1);
+ }
}

static struct pci_epf_ops ops = {
diff --git a/drivers/misc/xlink-pcie/local_host/epf.h b/drivers/misc/xlink-pcie/local_host/epf.h
index 6ce5260e67be..675c07455ffa 100644
--- a/drivers/misc/xlink-pcie/local_host/epf.h
+++ b/drivers/misc/xlink-pcie/local_host/epf.h
@@ -14,6 +14,7 @@
#include <linux/pci-epf.h>

#include "xpcie.h"
+#include "util.h"

#define XPCIE_DRIVER_NAME "mxlk_pcie_epf"
#define XPCIE_DRIVER_DESC "Intel(R) xLink PCIe endpoint function driver"
@@ -26,6 +27,7 @@
#define XPCIE_NUM_RX_DESCS (64)

extern bool dma_ll_mode;
+extern u32 xlink_sw_id;

struct xpcie_dma_ll_desc {
u32 dma_ch_control1;
@@ -67,14 +69,38 @@ struct xpcie_epf {
void __iomem *dbi_base;
char stepping[KEEMBAY_XPCIE_STEPPING_MAXLEN];

+ irq_handler_t core_irq_callback;
+ dma_addr_t tx_phys;
+ void *tx_virt;
+ size_t tx_size;
+ dma_addr_t rx_phys;
+ void *rx_virt;
+ size_t rx_size;
+
struct xpcie_dma_ll_desc_buf tx_desc_buf[DMA_CHAN_NUM];
struct xpcie_dma_ll_desc_buf rx_desc_buf[DMA_CHAN_NUM];
};

+static inline struct device *xpcie_to_dev(struct xpcie *xpcie)
+{
+ struct xpcie_epf *xpcie_epf = container_of(xpcie,
+ struct xpcie_epf, xpcie);
+
+ return &xpcie_epf->epf->dev;
+}
+
int intel_xpcie_ep_dma_init(struct pci_epf *epf);
int intel_xpcie_ep_dma_uninit(struct pci_epf *epf);
int intel_xpcie_ep_dma_reset(struct pci_epf *epf);
int intel_xpcie_ep_dma_read_ll(struct pci_epf *epf, int chan, int descs_num);
int intel_xpcie_ep_dma_write_ll(struct pci_epf *epf, int chan, int descs_num);

+void intel_xpcie_register_host_irq(struct xpcie *xpcie,
+ irq_handler_t func);
+int intel_xpcie_raise_irq(struct xpcie *xpcie,
+ enum xpcie_doorbell_type type);
+int intel_xpcie_copy_from_host_ll(struct xpcie *xpcie,
+ int chan, int descs_num);
+int intel_xpcie_copy_to_host_ll(struct xpcie *xpcie,
+ int chan, int descs_num);
#endif /* XPCIE_EPF_HEADER_ */
diff --git a/drivers/misc/xlink-pcie/local_host/util.c b/drivers/misc/xlink-pcie/local_host/util.c
new file mode 100644
index 000000000000..ec808b0cd72b
--- /dev/null
+++ b/drivers/misc/xlink-pcie/local_host/util.c
@@ -0,0 +1,375 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*****************************************************************************
+ *
+ * Intel Keem Bay XLink PCIe Driver
+ *
+ * Copyright (C) 2020 Intel Corporation
+ *
+ ****************************************************************************/
+
+#include "util.h"
+
+void intel_xpcie_set_device_status(struct xpcie *xpcie, u32 status)
+{
+ xpcie->status = status;
+ intel_xpcie_iowrite32(status, xpcie->mmio + XPCIE_MMIO_DEV_STATUS);
+}
+
+u32 intel_xpcie_get_device_status(struct xpcie *xpcie)
+{
+ return intel_xpcie_ioread32(xpcie->mmio + XPCIE_MMIO_DEV_STATUS);
+}
+
+static size_t intel_xpcie_doorbell_offset(struct xpcie *xpcie,
+ enum xpcie_doorbell_direction dirt,
+ enum xpcie_doorbell_type type)
+{
+ if (dirt == TO_DEVICE && type == DATA_SENT)
+ return XPCIE_MMIO_HTOD_TX_DOORBELL;
+ if (dirt == TO_DEVICE && type == DATA_RECEIVED)
+ return XPCIE_MMIO_HTOD_RX_DOORBELL;
+ if (dirt == TO_DEVICE && type == DEV_EVENT)
+ return XPCIE_MMIO_HTOD_EVENT_DOORBELL;
+ if (dirt == FROM_DEVICE && type == DATA_SENT)
+ return XPCIE_MMIO_DTOH_TX_DOORBELL;
+ if (dirt == FROM_DEVICE && type == DATA_RECEIVED)
+ return XPCIE_MMIO_DTOH_RX_DOORBELL;
+ if (dirt == FROM_DEVICE && type == DEV_EVENT)
+ return XPCIE_MMIO_DTOH_EVENT_DOORBELL;
+
+ return 0;
+}
+
+void intel_xpcie_set_doorbell(struct xpcie *xpcie,
+ enum xpcie_doorbell_direction dirt,
+ enum xpcie_doorbell_type type, u8 value)
+{
+ size_t offset = intel_xpcie_doorbell_offset(xpcie, dirt, type);
+
+ intel_xpcie_iowrite8(value, xpcie->mmio + offset);
+}
+
+u8 intel_xpcie_get_doorbell(struct xpcie *xpcie,
+ enum xpcie_doorbell_direction dirt,
+ enum xpcie_doorbell_type type)
+{
+ size_t offset = intel_xpcie_doorbell_offset(xpcie, dirt, type);
+
+ return intel_xpcie_ioread8(xpcie->mmio + offset);
+}
+
+u32 intel_xpcie_get_host_status(struct xpcie *xpcie)
+{
+ return intel_xpcie_ioread32(xpcie->mmio + XPCIE_MMIO_HOST_STATUS);
+}
+
+void intel_xpcie_set_host_status(struct xpcie *xpcie, u32 status)
+{
+ xpcie->status = status;
+ intel_xpcie_iowrite32(status, xpcie->mmio + XPCIE_MMIO_HOST_STATUS);
+}
+
+struct xpcie_buf_desc *intel_xpcie_alloc_bd(size_t length)
+{
+ struct xpcie_buf_desc *bd;
+
+ bd = kzalloc(sizeof(*bd), GFP_KERNEL);
+ if (!bd)
+ return NULL;
+
+ bd->head = kzalloc(roundup(length, cache_line_size()), GFP_KERNEL);
+ if (!bd->head) {
+ kfree(bd);
+ return NULL;
+ }
+
+ bd->data = bd->head;
+ bd->length = length;
+ bd->true_len = length;
+ bd->next = NULL;
+ bd->own_mem = true;
+
+ return bd;
+}
+
+struct xpcie_buf_desc *intel_xpcie_alloc_bd_reuse(size_t length, void *virt,
+ dma_addr_t phys)
+{
+ struct xpcie_buf_desc *bd;
+
+ bd = kzalloc(sizeof(*bd), GFP_KERNEL);
+ if (!bd)
+ return NULL;
+
+ bd->head = virt;
+ bd->phys = phys;
+ bd->data = bd->head;
+ bd->length = length;
+ bd->true_len = length;
+ bd->next = NULL;
+ bd->own_mem = false;
+
+ return bd;
+}
+
+void intel_xpcie_free_bd(struct xpcie_buf_desc *bd)
+{
+ if (bd) {
+ if (bd->own_mem)
+ kfree(bd->head);
+ kfree(bd);
+ }
+}
+
+int intel_xpcie_list_init(struct xpcie_list *list)
+{
+ spin_lock_init(&list->lock);
+ list->bytes = 0;
+ list->buffers = 0;
+ list->head = NULL;
+ list->tail = NULL;
+
+ return 0;
+}
+
+void intel_xpcie_list_cleanup(struct xpcie_list *list)
+{
+ struct xpcie_buf_desc *bd;
+
+ spin_lock(&list->lock);
+ while (list->head) {
+ bd = list->head;
+ list->head = bd->next;
+ intel_xpcie_free_bd(bd);
+ }
+
+ list->head = NULL;
+ list->tail = NULL;
+ spin_unlock(&list->lock);
+}
+
+int intel_xpcie_list_put(struct xpcie_list *list, struct xpcie_buf_desc *bd)
+{
+ if (!bd)
+ return -EINVAL;
+
+ spin_lock(&list->lock);
+ if (list->head)
+ list->tail->next = bd;
+ else
+ list->head = bd;
+
+ while (bd) {
+ list->tail = bd;
+ list->bytes += bd->length;
+ list->buffers++;
+ bd = bd->next;
+ }
+ spin_unlock(&list->lock);
+
+ return 0;
+}
+
+int intel_xpcie_list_put_head(struct xpcie_list *list,
+ struct xpcie_buf_desc *bd)
+{
+ struct xpcie_buf_desc *old_head;
+
+ if (!bd)
+ return -EINVAL;
+
+ spin_lock(&list->lock);
+ old_head = list->head;
+ list->head = bd;
+ while (bd) {
+ list->bytes += bd->length;
+ list->buffers++;
+ if (!bd->next) {
+ list->tail = list->tail ? list->tail : bd;
+ bd->next = old_head;
+ break;
+ }
+ bd = bd->next;
+ }
+ spin_unlock(&list->lock);
+
+ return 0;
+}
+
+struct xpcie_buf_desc *intel_xpcie_list_get(struct xpcie_list *list)
+{
+ struct xpcie_buf_desc *bd;
+
+ spin_lock(&list->lock);
+ bd = list->head;
+ if (list->head) {
+ list->head = list->head->next;
+ if (!list->head)
+ list->tail = NULL;
+ bd->next = NULL;
+ list->bytes -= bd->length;
+ list->buffers--;
+ }
+ spin_unlock(&list->lock);
+
+ return bd;
+}
+
+void intel_xpcie_list_info(struct xpcie_list *list,
+ size_t *bytes, size_t *buffers)
+{
+ spin_lock(&list->lock);
+ *bytes = list->bytes;
+ *buffers = list->buffers;
+ spin_unlock(&list->lock);
+}
+
+struct xpcie_buf_desc *intel_xpcie_alloc_rx_bd(struct xpcie *xpcie)
+{
+ struct xpcie_buf_desc *bd;
+
+ bd = intel_xpcie_list_get(&xpcie->rx_pool);
+ if (bd) {
+ bd->data = bd->head;
+ bd->length = bd->true_len;
+ bd->next = NULL;
+ bd->interface = 0;
+ }
+
+ return bd;
+}
+
+void intel_xpcie_free_rx_bd(struct xpcie *xpcie, struct xpcie_buf_desc *bd)
+{
+ if (bd)
+ intel_xpcie_list_put(&xpcie->rx_pool, bd);
+}
+
+struct xpcie_buf_desc *intel_xpcie_alloc_tx_bd(struct xpcie *xpcie)
+{
+ struct xpcie_buf_desc *bd;
+
+ bd = intel_xpcie_list_get(&xpcie->tx_pool);
+ if (bd) {
+ bd->data = bd->head;
+ bd->length = bd->true_len;
+ bd->next = NULL;
+ bd->interface = 0;
+ } else {
+ xpcie->no_tx_buffer = true;
+ }
+
+ return bd;
+}
+
+void intel_xpcie_free_tx_bd(struct xpcie *xpcie, struct xpcie_buf_desc *bd)
+{
+ if (!bd)
+ return;
+
+ intel_xpcie_list_put(&xpcie->tx_pool, bd);
+
+ xpcie->no_tx_buffer = false;
+ wake_up_interruptible(&xpcie->tx_waitq);
+}
+
+int intel_xpcie_interface_init(struct xpcie *xpcie, int id)
+{
+ struct xpcie_interface *inf = xpcie->interfaces + id;
+
+ inf->id = id;
+ inf->xpcie = xpcie;
+
+ inf->partial_read = NULL;
+ intel_xpcie_list_init(&inf->read);
+ mutex_init(&inf->rlock);
+ inf->data_avail = false;
+ init_waitqueue_head(&inf->rx_waitq);
+
+ return 0;
+}
+
+void intel_xpcie_interface_cleanup(struct xpcie_interface *inf)
+{
+ struct xpcie_buf_desc *bd;
+
+ intel_xpcie_free_rx_bd(inf->xpcie, inf->partial_read);
+ while ((bd = intel_xpcie_list_get(&inf->read)))
+ intel_xpcie_free_rx_bd(inf->xpcie, bd);
+
+ mutex_destroy(&inf->rlock);
+}
+
+void intel_xpcie_interfaces_cleanup(struct xpcie *xpcie)
+{
+ int index;
+
+ for (index = 0; index < XPCIE_NUM_INTERFACES; index++)
+ intel_xpcie_interface_cleanup(xpcie->interfaces + index);
+
+ intel_xpcie_list_cleanup(&xpcie->write);
+ mutex_destroy(&xpcie->wlock);
+}
+
+int intel_xpcie_interfaces_init(struct xpcie *xpcie)
+{
+ int index;
+
+ mutex_init(&xpcie->wlock);
+ intel_xpcie_list_init(&xpcie->write);
+ init_waitqueue_head(&xpcie->tx_waitq);
+ xpcie->no_tx_buffer = false;
+
+ for (index = 0; index < XPCIE_NUM_INTERFACES; index++)
+ intel_xpcie_interface_init(xpcie, index);
+
+ return 0;
+}
+
+void intel_xpcie_add_bd_to_interface(struct xpcie *xpcie,
+ struct xpcie_buf_desc *bd)
+{
+ struct xpcie_interface *inf;
+
+ inf = xpcie->interfaces + bd->interface;
+
+ intel_xpcie_list_put(&inf->read, bd);
+
+ mutex_lock(&inf->rlock);
+ inf->data_avail = true;
+ mutex_unlock(&inf->rlock);
+ wake_up_interruptible(&inf->rx_waitq);
+}
+
+void *intel_xpcie_cap_find(struct xpcie *xpcie, u32 start, u16 id)
+{
+ int ttl = XPCIE_CAP_TTL;
+ void *hdr;
+ u16 id_out, next;
+
+ /* If user didn't specify start, assume start of mmio */
+ if (!start)
+ start = intel_xpcie_ioread32(xpcie->mmio + XPCIE_MMIO_CAP_OFF);
+
+ /* Read header info */
+ hdr = xpcie->mmio + start;
+
+ /* Check if we still have time to live */
+ while (ttl--) {
+ id_out = intel_xpcie_ioread16(hdr + XPCIE_CAP_HDR_ID);
+ next = intel_xpcie_ioread16(hdr + XPCIE_CAP_HDR_NEXT);
+
+ /* If cap matches, return header */
+ if (id_out == id)
+ return hdr;
+ /* If cap is NULL, we are at the end of the list */
+ else if (id_out == XPCIE_CAP_NULL)
+ return NULL;
+ /* If no match and no end of list, traverse the linked list */
+ else
+ hdr = xpcie->mmio + next;
+ }
+
+ /* If we reached here, the capability list is corrupted */
+ return NULL;
+}
diff --git a/drivers/misc/xlink-pcie/local_host/util.h b/drivers/misc/xlink-pcie/local_host/util.h
new file mode 100644
index 000000000000..908be897a61d
--- /dev/null
+++ b/drivers/misc/xlink-pcie/local_host/util.h
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*****************************************************************************
+ *
+ * Intel Keem Bay XLink PCIe Driver
+ *
+ * Copyright (C) 2020 Intel Corporation
+ *
+ ****************************************************************************/
+
+#ifndef XPCIE_UTIL_HEADER_
+#define XPCIE_UTIL_HEADER_
+
+#include "xpcie.h"
+
+enum xpcie_doorbell_direction {
+ TO_DEVICE,
+ FROM_DEVICE
+};
+
+enum xpcie_doorbell_type {
+ DATA_SENT,
+ DATA_RECEIVED,
+ DEV_EVENT
+};
+
+enum xpcie_event_type {
+ NO_OP,
+ REQUEST_RESET,
+ DEV_SHUTDOWN
+};
+
+void intel_xpcie_set_doorbell(struct xpcie *xpcie,
+ enum xpcie_doorbell_direction dirt,
+ enum xpcie_doorbell_type type, u8 value);
+u8 intel_xpcie_get_doorbell(struct xpcie *xpcie,
+ enum xpcie_doorbell_direction dirt,
+ enum xpcie_doorbell_type type);
+
+void intel_xpcie_set_device_status(struct xpcie *xpcie, u32 status);
+u32 intel_xpcie_get_device_status(struct xpcie *xpcie);
+u32 intel_xpcie_get_host_status(struct xpcie *xpcie);
+void intel_xpcie_set_host_status(struct xpcie *xpcie, u32 status);
+
+struct xpcie_buf_desc *intel_xpcie_alloc_bd(size_t length);
+struct xpcie_buf_desc *intel_xpcie_alloc_bd_reuse(size_t length, void *virt,
+ dma_addr_t phys);
+void intel_xpcie_free_bd(struct xpcie_buf_desc *bd);
+
+int intel_xpcie_list_init(struct xpcie_list *list);
+void intel_xpcie_list_cleanup(struct xpcie_list *list);
+int intel_xpcie_list_put(struct xpcie_list *list, struct xpcie_buf_desc *bd);
+int intel_xpcie_list_put_head(struct xpcie_list *list,
+ struct xpcie_buf_desc *bd);
+struct xpcie_buf_desc *intel_xpcie_list_get(struct xpcie_list *list);
+void intel_xpcie_list_info(struct xpcie_list *list, size_t *bytes,
+ size_t *buffers);
+
+struct xpcie_buf_desc *intel_xpcie_alloc_rx_bd(struct xpcie *xpcie);
+void intel_xpcie_free_rx_bd(struct xpcie *xpcie, struct xpcie_buf_desc *bd);
+struct xpcie_buf_desc *intel_xpcie_alloc_tx_bd(struct xpcie *xpcie);
+void intel_xpcie_free_tx_bd(struct xpcie *xpcie, struct xpcie_buf_desc *bd);
+
+int intel_xpcie_interface_init(struct xpcie *xpcie, int id);
+void intel_xpcie_interface_cleanup(struct xpcie_interface *inf);
+void intel_xpcie_interfaces_cleanup(struct xpcie *xpcie);
+int intel_xpcie_interfaces_init(struct xpcie *xpcie);
+void intel_xpcie_add_bd_to_interface(struct xpcie *xpcie,
+ struct xpcie_buf_desc *bd);
+void *intel_xpcie_cap_find(struct xpcie *xpcie, u32 start, u16 id);
+#endif /* XPCIE_UTIL_HEADER_ */
diff --git a/drivers/misc/xlink-pcie/local_host/xpcie.h b/drivers/misc/xlink-pcie/local_host/xpcie.h
index 932ec5d5c718..5ae0b3dbd503 100644
--- a/drivers/misc/xlink-pcie/local_host/xpcie.h
+++ b/drivers/misc/xlink-pcie/local_host/xpcie.h
@@ -14,6 +14,8 @@
#include <linux/module.h>
#include <linux/pci_ids.h>

+#include "core.h"
+
#ifndef PCI_DEVICE_ID_INTEL_KEEMBAY
#define PCI_DEVICE_ID_INTEL_KEEMBAY 0x6240
#endif
@@ -35,20 +37,83 @@ struct xpcie_version {
u16 build;
} __packed;

+/* Status encoding of both device and host */
+#define XPCIE_STATUS_ERROR (0xFFFFFFFF)
+#define XPCIE_STATUS_UNINIT (0)
+#define XPCIE_STATUS_READY (1)
+#define XPCIE_STATUS_RECOVERY (2)
+#define XPCIE_STATUS_OFF (3)
+#define XPCIE_STATUS_RUN (4)
+
+#define XPCIE_MAGIC_STRLEN (16)
+#define XPCIE_MAGIC_YOCTO "VPUYOCTO"
+
/* MMIO layout and offsets shared between device and host */
struct xpcie_mmio {
struct xpcie_version version;
+ u32 device_status;
+ u32 host_status;
u8 legacy_a0;
+ u8 htod_tx_doorbell;
+ u8 htod_rx_doorbell;
+ u8 htod_event_doorbell;
+ u8 dtoh_tx_doorbell;
+ u8 dtoh_rx_doorbell;
+ u8 dtoh_event_doorbell;
+ u8 reserved;
+ u32 cap_offset;
+ u8 magic[XPCIE_MAGIC_STRLEN];
} __packed;

#define XPCIE_MMIO_VERSION (offsetof(struct xpcie_mmio, version))
#define XPCIE_MMIO_LEGACY_A0 (offsetof(struct xpcie_mmio, legacy_a0))
+#define XPCIE_MMIO_DEV_STATUS (offsetof(struct xpcie_mmio, device_status))
+#define XPCIE_MMIO_LEGACY_A0 (offsetof(struct xpcie_mmio, legacy_a0))
+#define XPCIE_MMIO_HOST_STATUS (offsetof(struct xpcie_mmio, host_status))
+#define XPCIE_MMIO_LEGACY_A0 (offsetof(struct xpcie_mmio, legacy_a0))
+#define XPCIE_MMIO_HTOD_TX_DOORBELL \
+ (offsetof(struct xpcie_mmio, htod_tx_doorbell))
+#define XPCIE_MMIO_HTOD_RX_DOORBELL \
+ (offsetof(struct xpcie_mmio, htod_rx_doorbell))
+#define XPCIE_MMIO_HTOD_EVENT_DOORBELL \
+ (offsetof(struct xpcie_mmio, htod_event_doorbell))
+#define XPCIE_MMIO_DTOH_TX_DOORBELL \
+ (offsetof(struct xpcie_mmio, dtoh_tx_doorbell))
+#define XPCIE_MMIO_DTOH_RX_DOORBELL \
+ (offsetof(struct xpcie_mmio, dtoh_rx_doorbell))
+#define XPCIE_MMIO_DTOH_EVENT_DOORBELL \
+ (offsetof(struct xpcie_mmio, dtoh_event_doorbell))
+#define XPCIE_MMIO_CAP_OFF (offsetof(struct xpcie_mmio, cap_offset))
+#define XPCIE_MMIO_MAGIC_OFF (offsetof(struct xpcie_mmio, magic))

struct xpcie {
u32 status;
bool legacy_a0;
void *mmio;
void *bar4;
+
+ struct workqueue_struct *rx_wq;
+ struct workqueue_struct *tx_wq;
+
+ struct xpcie_interface interfaces[XPCIE_NUM_INTERFACES];
+
+ size_t fragment_size;
+ struct xpcie_cap_txrx *txrx;
+ struct xpcie_stream tx;
+ struct xpcie_stream rx;
+
+ struct mutex wlock; /* write lock */
+ struct xpcie_list write;
+ bool no_tx_buffer;
+ wait_queue_head_t tx_waitq;
+ bool tx_pending;
+ bool stop_flag;
+
+ struct xpcie_list rx_pool;
+ struct xpcie_list tx_pool;
+
+ struct delayed_work rx_event;
+ struct delayed_work tx_event;
};

#endif /* XPCIE_HEADER_ */
diff --git a/include/linux/xlink_drv_inf.h b/include/linux/xlink_drv_inf.h
new file mode 100644
index 000000000000..ffe8f4c253e6
--- /dev/null
+++ b/include/linux/xlink_drv_inf.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*****************************************************************************
+ *
+ * Intel Keem Bay XLink PCIe Driver
+ *
+ * Copyright (C) 2020 Intel Corporation
+ *
+ ****************************************************************************/
+
+#ifndef _XLINK_DRV_INF_H_
+#define _XLINK_DRV_INF_H_
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/types.h>
+
+#define XLINK_DEV_INF_TYPE_MASK GENMASK(27, 24)
+#define XLINK_DEV_PHYS_ID_MASK GENMASK(23, 8)
+#define XLINK_DEV_TYPE_MASK GENMASK(6, 4)
+#define XLINK_DEV_PCIE_ID_MASK GENMASK(3, 1)
+#define XLINK_DEV_FUNC_MASK GENMASK(0, 0)
+
+enum xlink_device_inf_type {
+ XLINK_DEV_INF_PCIE = 1,
+};
+
+enum xlink_device_type {
+ XLINK_DEV_TYPE_KMB = 0,
+};
+
+enum xlink_device_pcie {
+ XLINK_DEV_PCIE_0 = 0,
+};
+
+enum xlink_device_func {
+ XLINK_DEV_FUNC_VPU = 0,
+};
+
+enum _xlink_device_status {
+ _XLINK_DEV_OFF,
+ _XLINK_DEV_ERROR,
+ _XLINK_DEV_BUSY,
+ _XLINK_DEV_RECOVERY,
+ _XLINK_DEV_READY
+};
+
+int xlink_pcie_get_device_list(u32 *sw_device_id_list,
+ u32 *num_devices);
+int xlink_pcie_get_device_name(u32 sw_device_id, char *device_name,
+ size_t name_size);
+int xlink_pcie_get_device_status(u32 sw_device_id,
+ u32 *device_status);
+int xlink_pcie_boot_device(u32 sw_device_id, const char *binary_name);
+int xlink_pcie_connect(u32 sw_device_id);
+int xlink_pcie_read(u32 sw_device_id, void *data, size_t *const size,
+ u32 timeout);
+int xlink_pcie_write(u32 sw_device_id, void *data, size_t *const size,
+ u32 timeout);
+int xlink_pcie_reset_device(u32 sw_device_id);
+#endif
--
2.17.1
\
 
 \ /
  Last update: 2020-12-01 23:40    [W:0.478 / U:0.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site