1 files changed, 429 insertions, 0 deletions
diff --git a/drivers/misc/mic/card/mic_device.c b/drivers/misc/mic/card/mic_device.c
new file mode 100644
index 000000000..e749af48f
--- /dev/null
+++ b/drivers/misc/mic/card/mic_device.c
@@ -0,0 +1,429 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2013 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Disclaimer: The codes contained in these modules may be specific to
+ * the Intel Software Development Platform codenamed: Knights Ferry, and
+ * the Intel product codenamed: Knights Corner, and are not backward
+ * compatible with other Intel products. Additionally, Intel will NOT
+ * support the codes or instruction set in future products.
+ *
+ * Intel MIC Card driver.
+ *
+ */
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+#include <linux/dmaengine.h>
+#include <linux/kmod.h>
+
+#include <linux/mic_common.h>
+#include "../common/mic_dev.h"
+#include "mic_device.h"
+
+static struct mic_driver *g_drv;
+
+static int __init mic_dp_init(void)
+{
+	struct mic_driver *mdrv = g_drv;
+	struct mic_device *mdev = &mdrv->mdev;
+	struct mic_bootparam __iomem *bootparam;
+	u64 lo, hi, dp_dma_addr;
+	u32 magic;
+
+	lo = mic_read_spad(&mdrv->mdev, MIC_DPLO_SPAD);
+	hi = mic_read_spad(&mdrv->mdev, MIC_DPHI_SPAD);
+
+	dp_dma_addr = lo | (hi << 32);
+	mdrv->dp = mic_card_map(mdev, dp_dma_addr, MIC_DP_SIZE);
+	if (!mdrv->dp) {
+		dev_err(mdrv->dev, "Cannot remap Aperture BAR\n");
+		return -ENOMEM;
+	}
+	bootparam = mdrv->dp;
+	magic = ioread32(&bootparam->magic);
+	if (MIC_MAGIC != magic) {
+		dev_err(mdrv->dev, "bootparam magic mismatch 0x%x\n", magic);
+		return -EIO;
+	}
+	return 0;
+}
+
+/* Uninitialize the device page */
+static void mic_dp_uninit(void)
+{
+	mic_card_unmap(&g_drv->mdev, g_drv->dp);
+}
+
+/**
+ * mic_request_card_irq - request an irq.
+ *
+ * @handler: interrupt handler passed to request_threaded_irq.
+ * @thread_fn: thread fn. passed to request_threaded_irq.
+ * @name: The ASCII name of the callee requesting the irq.
+ * @data: private data that is returned back when calling the
+ * function handler.
+ * @index: The doorbell index of the requester.
+ *
+ * returns: The cookie that is transparent to the caller. Passed
+ * back when calling mic_free_irq. An appropriate error code
+ * is returned on failure. Caller needs to use IS_ERR(return_val)
+ * to check for failure and PTR_ERR(return_val) to obtained the
+ * error code.
+ *
+ */
+struct mic_irq *
+mic_request_card_irq(irq_handler_t handler,
+		     irq_handler_t thread_fn, const char *name,
+		     void *data, int index)
+{
+	int rc = 0;
+	unsigned long cookie;
+	struct mic_driver *mdrv = g_drv;
+
+	rc  = request_threaded_irq(mic_db_to_irq(mdrv, index), handler,
+				   thread_fn, 0, name, data);
+	if (rc) {
+		dev_err(mdrv->dev, "request_threaded_irq failed rc = %d\n", rc);
+		goto err;
+	}
+	mdrv->irq_info.irq_usage_count[index]++;
+	cookie = index;
+	return (struct mic_irq *)cookie;
+err:
+	return ERR_PTR(rc);
+}
+
+/**
+ * mic_free_card_irq - free irq.
+ *
+ * @cookie: cookie obtained during a successful call to mic_request_threaded_irq
+ * @data: private data specified by the calling function during the
+ * mic_request_threaded_irq
+ *
+ * returns: none.
+ */
+void mic_free_card_irq(struct mic_irq *cookie, void *data)
+{
+	int index;
+	struct mic_driver *mdrv = g_drv;
+
+	index = (unsigned long)cookie & 0xFFFFU;
+	free_irq(mic_db_to_irq(mdrv, index), data);
+	mdrv->irq_info.irq_usage_count[index]--;
+}
+
+/**
+ * mic_next_card_db - Get the doorbell with minimum usage count.
+ *
+ * Returns the irq index.
+ */
+int mic_next_card_db(void)
+{
+	int i;
+	int index = 0;
+	struct mic_driver *mdrv = g_drv;
+
+	for (i = 0; i < mdrv->intr_info.num_intr; i++) {
+		if (mdrv->irq_info.irq_usage_count[i] <
+			mdrv->irq_info.irq_usage_count[index])
+			index = i;
+	}
+
+	return index;
+}
+
+/**
+ * mic_init_irq - Initialize irq information.
+ *
+ * Returns 0 in success. Appropriate error code on failure.
+ */
+static int mic_init_irq(void)
+{
+	struct mic_driver *mdrv = g_drv;
+
+	mdrv->irq_info.irq_usage_count = kzalloc((sizeof(u32) *
+			mdrv->intr_info.num_intr),
+			GFP_KERNEL);
+	if (!mdrv->irq_info.irq_usage_count)
+		return -ENOMEM;
+	return 0;
+}
+
+/**
+ * mic_uninit_irq - Uninitialize irq information.
+ *
+ * None.
+ */
+static void mic_uninit_irq(void)
+{
+	struct mic_driver *mdrv = g_drv;
+
+	kfree(mdrv->irq_info.irq_usage_count);
+}
+
+static inline struct mic_driver *scdev_to_mdrv(struct scif_hw_dev *scdev)
+{
+	return dev_get_drvdata(scdev->dev.parent);
+}
+
+static struct mic_irq *
+___mic_request_irq(struct scif_hw_dev *scdev,
+		   irqreturn_t (*func)(int irq, void *data),
+				       const char *name, void *data,
+				       int db)
+{
+	return mic_request_card_irq(func, NULL, name, data, db);
+}
+
+static void
+___mic_free_irq(struct scif_hw_dev *scdev,
+		struct mic_irq *cookie, void *data)
+{
+	return mic_free_card_irq(cookie, data);
+}
+
+static void ___mic_ack_interrupt(struct scif_hw_dev *scdev, int num)
+{
+	struct mic_driver *mdrv = scdev_to_mdrv(scdev);
+
+	mic_ack_interrupt(&mdrv->mdev);
+}
+
+static int ___mic_next_db(struct scif_hw_dev *scdev)
+{
+	return mic_next_card_db();
+}
+
+static void ___mic_send_intr(struct scif_hw_dev *scdev, int db)
+{
+	struct mic_driver *mdrv = scdev_to_mdrv(scdev);
+
+	mic_send_intr(&mdrv->mdev, db);
+}
+
+static void ___mic_send_p2p_intr(struct scif_hw_dev *scdev, int db,
+				 struct mic_mw *mw)
+{
+	mic_send_p2p_intr(db, mw);
+}
+
+static void __iomem *
+___mic_ioremap(struct scif_hw_dev *scdev,
+	       phys_addr_t pa, size_t len)
+{
+	struct mic_driver *mdrv = scdev_to_mdrv(scdev);
+
+	return mic_card_map(&mdrv->mdev, pa, len);
+}
+
+static void ___mic_iounmap(struct scif_hw_dev *scdev, void __iomem *va)
+{
+	struct mic_driver *mdrv = scdev_to_mdrv(scdev);
+
+	mic_card_unmap(&mdrv->mdev, va);
+}
+
+static struct scif_hw_ops scif_hw_ops = {
+	.request_irq = ___mic_request_irq,
+	.free_irq = ___mic_free_irq,
+	.ack_interrupt = ___mic_ack_interrupt,
+	.next_db = ___mic_next_db,
+	.send_intr = ___mic_send_intr,
+	.send_p2p_intr = ___mic_send_p2p_intr,
+	.ioremap = ___mic_ioremap,
+	.iounmap = ___mic_iounmap,
+};
+
+static inline struct mic_driver *vpdev_to_mdrv(struct vop_device *vpdev)
+{
+	return dev_get_drvdata(vpdev->dev.parent);
+}
+
+static struct mic_irq *
+__mic_request_irq(struct vop_device *vpdev,
+		  irqreturn_t (*func)(int irq, void *data),
+		   const char *name, void *data, int intr_src)
+{
+	return mic_request_card_irq(func, NULL, name, data, intr_src);
+}
+
+static void __mic_free_irq(struct vop_device *vpdev,
+			   struct mic_irq *cookie, void *data)
+{
+	return mic_free_card_irq(cookie, data);
+}
+
+static void __mic_ack_interrupt(struct vop_device *vpdev, int num)
+{
+	struct mic_driver *mdrv = vpdev_to_mdrv(vpdev);
+
+	mic_ack_interrupt(&mdrv->mdev);
+}
+
+static int __mic_next_db(struct vop_device *vpdev)
+{
+	return mic_next_card_db();
+}
+
+static void __iomem *__mic_get_remote_dp(struct vop_device *vpdev)
+{
+	struct mic_driver *mdrv = vpdev_to_mdrv(vpdev);
+
+	return mdrv->dp;
+}
+
+static void __mic_send_intr(struct vop_device *vpdev, int db)
+{
+	struct mic_driver *mdrv = vpdev_to_mdrv(vpdev);
+
+	mic_send_intr(&mdrv->mdev, db);
+}
+
+static void __iomem *__mic_ioremap(struct vop_device *vpdev,
+				   dma_addr_t pa, size_t len)
+{
+	struct mic_driver *mdrv = vpdev_to_mdrv(vpdev);
+
+	return mic_card_map(&mdrv->mdev, pa, len);
+}
+
+static void __mic_iounmap(struct vop_device *vpdev, void __iomem *va)
+{
+	struct mic_driver *mdrv = vpdev_to_mdrv(vpdev);
+
+	mic_card_unmap(&mdrv->mdev, va);
+}
+
+static struct vop_hw_ops vop_hw_ops = {
+	.request_irq = __mic_request_irq,
+	.free_irq = __mic_free_irq,
+	.ack_interrupt = __mic_ack_interrupt,
+	.next_db = __mic_next_db,
+	.get_remote_dp = __mic_get_remote_dp,
+	.send_intr = __mic_send_intr,
+	.ioremap = __mic_ioremap,
+	.iounmap = __mic_iounmap,
+};
+
+static int mic_request_dma_chans(struct mic_driver *mdrv)
+{
+	dma_cap_mask_t mask;
+	struct dma_chan *chan;
+
+	dma_cap_zero(mask);
+	dma_cap_set(DMA_MEMCPY, mask);
+
+	do {
+		chan = dma_request_channel(mask, NULL, NULL);
+		if (chan) {
+			mdrv->dma_ch[mdrv->num_dma_ch++] = chan;
+			if (mdrv->num_dma_ch >= MIC_MAX_DMA_CHAN)
+				break;
+		}
+	} while (chan);
+	dev_info(mdrv->dev, "DMA channels # %d\n", mdrv->num_dma_ch);
+	return mdrv->num_dma_ch;
+}
+
+static void mic_free_dma_chans(struct mic_driver *mdrv)
+{
+	int i = 0;
+
+	for (i = 0; i < mdrv->num_dma_ch; i++) {
+		dma_release_channel(mdrv->dma_ch[i]);
+		mdrv->dma_ch[i] = NULL;
+	}
+	mdrv->num_dma_ch = 0;
+}
+
+/*
+ * mic_driver_init - MIC driver initialization tasks.
+ *
+ * Returns 0 in success. Appropriate error code on failure.
+ */
+int __init mic_driver_init(struct mic_driver *mdrv)
+{
+	int rc;
+	struct mic_bootparam __iomem *bootparam;
+	u8 node_id;
+
+	g_drv = mdrv;
+	/* Unloading the card module is not supported. */
+	if (!try_module_get(mdrv->dev->driver->owner)) {
+		rc = -ENODEV;
+		goto done;
+	}
+	rc = mic_dp_init();
+	if (rc)
+		goto put;
+	rc = mic_init_irq();
+	if (rc)
+		goto dp_uninit;
+	if (!mic_request_dma_chans(mdrv)) {
+		rc = -ENODEV;
+		goto irq_uninit;
+	}
+	mdrv->vpdev = vop_register_device(mdrv->dev, VOP_DEV_TRNSP,
+					  NULL, &vop_hw_ops, 0,
+					  NULL, mdrv->dma_ch[0]);
+	if (IS_ERR(mdrv->vpdev)) {
+		rc = PTR_ERR(mdrv->vpdev);
+		goto dma_free;
+	}
+	bootparam = mdrv->dp;
+	node_id = ioread8(&bootparam->node_id);
+	mdrv->scdev = scif_register_device(mdrv->dev, MIC_SCIF_DEV,
+					   NULL, &scif_hw_ops,
+					   0, node_id, &mdrv->mdev.mmio, NULL,
+					   NULL, mdrv->dp, mdrv->dma_ch,
+					   mdrv->num_dma_ch, true);
+	if (IS_ERR(mdrv->scdev)) {
+		rc = PTR_ERR(mdrv->scdev);
+		goto vop_remove;
+	}
+	mic_create_card_debug_dir(mdrv);
+done:
+	return rc;
+vop_remove:
+	vop_unregister_device(mdrv->vpdev);
+dma_free:
+	mic_free_dma_chans(mdrv);
+irq_uninit:
+	mic_uninit_irq();
+dp_uninit:
+	mic_dp_uninit();
+put:
+	module_put(mdrv->dev->driver->owner);
+	return rc;
+}
+
+/*
+ * mic_driver_uninit - MIC driver uninitialization tasks.
+ *
+ * Returns None
+ */
+void mic_driver_uninit(struct mic_driver *mdrv)
+{
+	mic_delete_card_debug_dir(mdrv);
+	scif_unregister_device(mdrv->scdev);
+	vop_unregister_device(mdrv->vpdev);
+	mic_free_dma_chans(mdrv);
+	mic_uninit_irq();
+	mic_dp_uninit();
+	module_put(mdrv->dev->driver->owner);
+}