Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 918 insertions, 0 deletions

diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c
new file mode 100644
index 000000000..e9c9ef52c
--- /dev/null
+++ b/drivers/misc/hpilo.c
@@ -0,0 +1,918 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the HP iLO management processor.
+ *
+ * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
+ *	David Altobelli <david.altobelli@hpe.com>
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/file.h>
+#include <linux/cdev.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/wait.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include "hpilo.h"
+
+static struct class *ilo_class;
+static unsigned int ilo_major;
+static unsigned int max_ccb = 16;
+static char ilo_hwdev[MAX_ILO_DEV];
+
+static inline int get_entry_id(int entry)
+{
+	return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR;
+}
+
+static inline int get_entry_len(int entry)
+{
+	return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3;
+}
+
+static inline int mk_entry(int id, int len)
+{
+	int qlen = len & 7 ? (len >> 3) + 1 : len >> 3;
+	return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS;
+}
+
+static inline int desc_mem_sz(int nr_entry)
+{
+	return nr_entry << L2_QENTRY_SZ;
+}
+
+/*
+ * FIFO queues, shared with hardware.
+ *
+ * If a queue has empty slots, an entry is added to the queue tail,
+ * and that entry is marked as occupied.
+ * Entries can be dequeued from the head of the list, when the device
+ * has marked the entry as consumed.
+ *
+ * Returns true on successful queue/dequeue, false on failure.
+ */
+static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
+{
+	struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&hw->fifo_lock, flags);
+	if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask]
+	      & ENTRY_MASK_O)) {
+		fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |=
+				(entry & ENTRY_MASK_NOSTATE) | fifo_q->merge;
+		fifo_q->tail += 1;
+		ret = 1;
+	}
+	spin_unlock_irqrestore(&hw->fifo_lock, flags);
+
+	return ret;
+}
+
+static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
+{
+	struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
+	unsigned long flags;
+	int ret = 0;
+	u64 c;
+
+	spin_lock_irqsave(&hw->fifo_lock, flags);
+	c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
+	if (c & ENTRY_MASK_C) {
+		if (entry)
+			*entry = c & ENTRY_MASK_NOSTATE;
+
+		fifo_q->fifobar[fifo_q->head & fifo_q->imask] =
+							(c | ENTRY_MASK) + 1;
+		fifo_q->head += 1;
+		ret = 1;
+	}
+	spin_unlock_irqrestore(&hw->fifo_lock, flags);
+
+	return ret;
+}
+
+static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar)
+{
+	struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
+	unsigned long flags;
+	int ret = 0;
+	u64 c;
+
+	spin_lock_irqsave(&hw->fifo_lock, flags);
+	c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
+	if (c & ENTRY_MASK_C)
+		ret = 1;
+	spin_unlock_irqrestore(&hw->fifo_lock, flags);
+
+	return ret;
+}
+
+static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb,
+			   int dir, int id, int len)
+{
+	char *fifobar;
+	int entry;
+
+	if (dir == SENDQ)
+		fifobar = ccb->ccb_u1.send_fifobar;
+	else
+		fifobar = ccb->ccb_u3.recv_fifobar;
+
+	entry = mk_entry(id, len);
+	return fifo_enqueue(hw, fifobar, entry);
+}
+
+static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb,
+			   int dir, int *id, int *len, void **pkt)
+{
+	char *fifobar, *desc;
+	int entry = 0, pkt_id = 0;
+	int ret;
+
+	if (dir == SENDQ) {
+		fifobar = ccb->ccb_u1.send_fifobar;
+		desc = ccb->ccb_u2.send_desc;
+	} else {
+		fifobar = ccb->ccb_u3.recv_fifobar;
+		desc = ccb->ccb_u4.recv_desc;
+	}
+
+	ret = fifo_dequeue(hw, fifobar, &entry);
+	if (ret) {
+		pkt_id = get_entry_id(entry);
+		if (id)
+			*id = pkt_id;
+		if (len)
+			*len = get_entry_len(entry);
+		if (pkt)
+			*pkt = (void *)(desc + desc_mem_sz(pkt_id));
+	}
+
+	return ret;
+}
+
+static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb)
+{
+	char *fifobar = ccb->ccb_u3.recv_fifobar;
+
+	return fifo_check_recv(hw, fifobar);
+}
+
+static inline void doorbell_set(struct ccb *ccb)
+{
+	iowrite8(1, ccb->ccb_u5.db_base);
+}
+
+static inline void doorbell_clr(struct ccb *ccb)
+{
+	iowrite8(2, ccb->ccb_u5.db_base);
+}
+
+static inline int ctrl_set(int l2sz, int idxmask, int desclim)
+{
+	int active = 0, go = 1;
+	return l2sz << CTRL_BITPOS_L2SZ |
+	       idxmask << CTRL_BITPOS_FIFOINDEXMASK |
+	       desclim << CTRL_BITPOS_DESCLIMIT |
+	       active << CTRL_BITPOS_A |
+	       go << CTRL_BITPOS_G;
+}
+
+static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz)
+{
+	/* for simplicity, use the same parameters for send and recv ctrls */
+	ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
+	ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
+}
+
+static inline int fifo_sz(int nr_entry)
+{
+	/* size of a fifo is determined by the number of entries it contains */
+	return (nr_entry * sizeof(u64)) + FIFOHANDLESIZE;
+}
+
+static void fifo_setup(void *base_addr, int nr_entry)
+{
+	struct fifo *fifo_q = base_addr;
+	int i;
+
+	/* set up an empty fifo */
+	fifo_q->head = 0;
+	fifo_q->tail = 0;
+	fifo_q->reset = 0;
+	fifo_q->nrents = nr_entry;
+	fifo_q->imask = nr_entry - 1;
+	fifo_q->merge = ENTRY_MASK_O;
+
+	for (i = 0; i < nr_entry; i++)
+		fifo_q->fifobar[i] = 0;
+}
+
+static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data)
+{
+	struct ccb *driver_ccb = &data->driver_ccb;
+	struct ccb __iomem *device_ccb = data->mapped_ccb;
+	int retries;
+
+	/* complicated dance to tell the hw we are stopping */
+	doorbell_clr(driver_ccb);
+	iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G),
+		  &device_ccb->send_ctrl);
+	iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G),
+		  &device_ccb->recv_ctrl);
+
+	/* give iLO some time to process stop request */
+	for (retries = MAX_WAIT; retries > 0; retries--) {
+		doorbell_set(driver_ccb);
+		udelay(WAIT_TIME);
+		if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A))
+		    &&
+		    !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A)))
+			break;
+	}
+	if (retries == 0)
+		dev_err(&pdev->dev, "Closing, but controller still active\n");
+
+	/* clear the hw ccb */
+	memset_io(device_ccb, 0, sizeof(struct ccb));
+
+	/* free resources used to back send/recv queues */
+	pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa);
+}
+
+static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
+{
+	char *dma_va;
+	dma_addr_t dma_pa;
+	struct ccb *driver_ccb, *ilo_ccb;
+
+	driver_ccb = &data->driver_ccb;
+	ilo_ccb = &data->ilo_ccb;
+
+	data->dma_size = 2 * fifo_sz(NR_QENTRY) +
+			 2 * desc_mem_sz(NR_QENTRY) +
+			 ILO_START_ALIGN + ILO_CACHE_SZ;
+
+	data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size,
+					    &data->dma_pa);
+	if (!data->dma_va)
+		return -ENOMEM;
+
+	dma_va = (char *)data->dma_va;
+	dma_pa = data->dma_pa;
+
+	memset(dma_va, 0, data->dma_size);
+
+	dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN);
+	dma_pa = roundup(dma_pa, ILO_START_ALIGN);
+
+	/*
+	 * Create two ccb's, one with virt addrs, one with phys addrs.
+	 * Copy the phys addr ccb to device shared mem.
+	 */
+	ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ);
+	ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ);
+
+	fifo_setup(dma_va, NR_QENTRY);
+	driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE;
+	ilo_ccb->ccb_u1.send_fifobar_pa = dma_pa + FIFOHANDLESIZE;
+	dma_va += fifo_sz(NR_QENTRY);
+	dma_pa += fifo_sz(NR_QENTRY);
+
+	dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ);
+	dma_pa = roundup(dma_pa, ILO_CACHE_SZ);
+
+	fifo_setup(dma_va, NR_QENTRY);
+	driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE;
+	ilo_ccb->ccb_u3.recv_fifobar_pa = dma_pa + FIFOHANDLESIZE;
+	dma_va += fifo_sz(NR_QENTRY);
+	dma_pa += fifo_sz(NR_QENTRY);
+
+	driver_ccb->ccb_u2.send_desc = dma_va;
+	ilo_ccb->ccb_u2.send_desc_pa = dma_pa;
+	dma_pa += desc_mem_sz(NR_QENTRY);
+	dma_va += desc_mem_sz(NR_QENTRY);
+
+	driver_ccb->ccb_u4.recv_desc = dma_va;
+	ilo_ccb->ccb_u4.recv_desc_pa = dma_pa;
+
+	driver_ccb->channel = slot;
+	ilo_ccb->channel = slot;
+
+	driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE);
+	ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */
+
+	return 0;
+}
+
+static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
+{
+	int pkt_id, pkt_sz;
+	struct ccb *driver_ccb = &data->driver_ccb;
+
+	/* copy the ccb with physical addrs to device memory */
+	data->mapped_ccb = (struct ccb __iomem *)
+				(hw->ram_vaddr + (slot * ILOHW_CCB_SZ));
+	memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb));
+
+	/* put packets on the send and receive queues */
+	pkt_sz = 0;
+	for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) {
+		ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz);
+		doorbell_set(driver_ccb);
+	}
+
+	pkt_sz = desc_mem_sz(1);
+	for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++)
+		ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz);
+
+	/* the ccb is ready to use */
+	doorbell_clr(driver_ccb);
+}
+
+static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data)
+{
+	int pkt_id, i;
+	struct ccb *driver_ccb = &data->driver_ccb;
+
+	/* make sure iLO is really handling requests */
+	for (i = MAX_WAIT; i > 0; i--) {
+		if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL))
+			break;
+		udelay(WAIT_TIME);
+	}
+
+	if (i == 0) {
+		dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n");
+		return -EBUSY;
+	}
+
+	ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
+	doorbell_set(driver_ccb);
+	return 0;
+}
+
+static inline int is_channel_reset(struct ccb *ccb)
+{
+	/* check for this particular channel needing a reset */
+	return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset;
+}
+
+static inline void set_channel_reset(struct ccb *ccb)
+{
+	/* set a flag indicating this channel needs a reset */
+	FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1;
+}
+
+static inline int get_device_outbound(struct ilo_hwinfo *hw)
+{
+	return ioread32(&hw->mmio_vaddr[DB_OUT]);
+}
+
+static inline int is_db_reset(int db_out)
+{
+	return db_out & (1 << DB_RESET);
+}
+
+static inline int is_device_reset(struct ilo_hwinfo *hw)
+{
+	/* check for global reset condition */
+	return is_db_reset(get_device_outbound(hw));
+}
+
+static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr)
+{
+	iowrite32(clr, &hw->mmio_vaddr[DB_OUT]);
+}
+
+static inline void clear_device(struct ilo_hwinfo *hw)
+{
+	/* clear the device (reset bits, pending channel entries) */
+	clear_pending_db(hw, -1);
+}
+
+static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw)
+{
+	iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]);
+}
+
+static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw)
+{
+	iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1,
+		 &hw->mmio_vaddr[DB_IRQ]);
+}
+
+static void ilo_set_reset(struct ilo_hwinfo *hw)
+{
+	int slot;
+
+	/*
+	 * Mapped memory is zeroed on ilo reset, so set a per ccb flag
+	 * to indicate that this ccb needs to be closed and reopened.
+	 */
+	for (slot = 0; slot < max_ccb; slot++) {
+		if (!hw->ccb_alloc[slot])
+			continue;
+		set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb);
+	}
+}
+
+static ssize_t ilo_read(struct file *fp, char __user *buf,
+			size_t len, loff_t *off)
+{
+	int err, found, cnt, pkt_id, pkt_len;
+	struct ccb_data *data = fp->private_data;
+	struct ccb *driver_ccb = &data->driver_ccb;
+	struct ilo_hwinfo *hw = data->ilo_hw;
+	void *pkt;
+
+	if (is_channel_reset(driver_ccb)) {
+		/*
+		 * If the device has been reset, applications
+		 * need to close and reopen all ccbs.
+		 */
+		return -ENODEV;
+	}
+
+	/*
+	 * This function is to be called when data is expected
+	 * in the channel, and will return an error if no packet is found
+	 * during the loop below.  The sleep/retry logic is to allow
+	 * applications to call read() immediately post write(),
+	 * and give iLO some time to process the sent packet.
+	 */
+	cnt = 20;
+	do {
+		/* look for a received packet */
+		found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id,
+					&pkt_len, &pkt);
+		if (found)
+			break;
+		cnt--;
+		msleep(100);
+	} while (!found && cnt);
+
+	if (!found)
+		return -EAGAIN;
+
+	/* only copy the length of the received packet */
+	if (pkt_len < len)
+		len = pkt_len;
+
+	err = copy_to_user(buf, pkt, len);
+
+	/* return the received packet to the queue */
+	ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1));
+
+	return err ? -EFAULT : len;
+}
+
+static ssize_t ilo_write(struct file *fp, const char __user *buf,
+			 size_t len, loff_t *off)
+{
+	int err, pkt_id, pkt_len;
+	struct ccb_data *data = fp->private_data;
+	struct ccb *driver_ccb = &data->driver_ccb;
+	struct ilo_hwinfo *hw = data->ilo_hw;
+	void *pkt;
+
+	if (is_channel_reset(driver_ccb))
+		return -ENODEV;
+
+	/* get a packet to send the user command */
+	if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
+		return -EBUSY;
+
+	/* limit the length to the length of the packet */
+	if (pkt_len < len)
+		len = pkt_len;
+
+	/* on failure, set the len to 0 to return empty packet to the device */
+	err = copy_from_user(pkt, buf, len);
+	if (err)
+		len = 0;
+
+	/* send the packet */
+	ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len);
+	doorbell_set(driver_ccb);
+
+	return err ? -EFAULT : len;
+}
+
+static __poll_t ilo_poll(struct file *fp, poll_table *wait)
+{
+	struct ccb_data *data = fp->private_data;
+	struct ccb *driver_ccb = &data->driver_ccb;
+
+	poll_wait(fp, &data->ccb_waitq, wait);
+
+	if (is_channel_reset(driver_ccb))
+		return EPOLLERR;
+	else if (ilo_pkt_recv(data->ilo_hw, driver_ccb))
+		return EPOLLIN | EPOLLRDNORM;
+
+	return 0;
+}
+
+static int ilo_close(struct inode *ip, struct file *fp)
+{
+	int slot;
+	struct ccb_data *data;
+	struct ilo_hwinfo *hw;
+	unsigned long flags;
+
+	slot = iminor(ip) % max_ccb;
+	hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
+
+	spin_lock(&hw->open_lock);
+
+	if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
+
+		data = fp->private_data;
+
+		spin_lock_irqsave(&hw->alloc_lock, flags);
+		hw->ccb_alloc[slot] = NULL;
+		spin_unlock_irqrestore(&hw->alloc_lock, flags);
+
+		ilo_ccb_close(hw->ilo_dev, data);
+
+		kfree(data);
+	} else
+		hw->ccb_alloc[slot]->ccb_cnt--;
+
+	spin_unlock(&hw->open_lock);
+
+	return 0;
+}
+
+static int ilo_open(struct inode *ip, struct file *fp)
+{
+	int slot, error;
+	struct ccb_data *data;
+	struct ilo_hwinfo *hw;
+	unsigned long flags;
+
+	slot = iminor(ip) % max_ccb;
+	hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
+
+	/* new ccb allocation */
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	spin_lock(&hw->open_lock);
+
+	/* each fd private_data holds sw/hw view of ccb */
+	if (hw->ccb_alloc[slot] == NULL) {
+		/* create a channel control block for this minor */
+		error = ilo_ccb_setup(hw, data, slot);
+		if (error) {
+			kfree(data);
+			goto out;
+		}
+
+		data->ccb_cnt = 1;
+		data->ccb_excl = fp->f_flags & O_EXCL;
+		data->ilo_hw = hw;
+		init_waitqueue_head(&data->ccb_waitq);
+
+		/* write the ccb to hw */
+		spin_lock_irqsave(&hw->alloc_lock, flags);
+		ilo_ccb_open(hw, data, slot);
+		hw->ccb_alloc[slot] = data;
+		spin_unlock_irqrestore(&hw->alloc_lock, flags);
+
+		/* make sure the channel is functional */
+		error = ilo_ccb_verify(hw, data);
+		if (error) {
+
+			spin_lock_irqsave(&hw->alloc_lock, flags);
+			hw->ccb_alloc[slot] = NULL;
+			spin_unlock_irqrestore(&hw->alloc_lock, flags);
+
+			ilo_ccb_close(hw->ilo_dev, data);
+
+			kfree(data);
+			goto out;
+		}
+
+	} else {
+		kfree(data);
+		if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
+			/*
+			 * The channel exists, and either this open
+			 * or a previous open of this channel wants
+			 * exclusive access.
+			 */
+			error = -EBUSY;
+		} else {
+			hw->ccb_alloc[slot]->ccb_cnt++;
+			error = 0;
+		}
+	}
+out:
+	spin_unlock(&hw->open_lock);
+
+	if (!error)
+		fp->private_data = hw->ccb_alloc[slot];
+
+	return error;
+}
+
+static const struct file_operations ilo_fops = {
+	.owner		= THIS_MODULE,
+	.read		= ilo_read,
+	.write		= ilo_write,
+	.poll		= ilo_poll,
+	.open 		= ilo_open,
+	.release 	= ilo_close,
+	.llseek		= noop_llseek,
+};
+
+static irqreturn_t ilo_isr(int irq, void *data)
+{
+	struct ilo_hwinfo *hw = data;
+	int pending, i;
+
+	spin_lock(&hw->alloc_lock);
+
+	/* check for ccbs which have data */
+	pending = get_device_outbound(hw);
+	if (!pending) {
+		spin_unlock(&hw->alloc_lock);
+		return IRQ_NONE;
+	}
+
+	if (is_db_reset(pending)) {
+		/* wake up all ccbs if the device was reset */
+		pending = -1;
+		ilo_set_reset(hw);
+	}
+
+	for (i = 0; i < max_ccb; i++) {
+		if (!hw->ccb_alloc[i])
+			continue;
+		if (pending & (1 << i))
+			wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq);
+	}
+
+	/* clear the device of the channels that have been handled */
+	clear_pending_db(hw, pending);
+
+	spin_unlock(&hw->alloc_lock);
+
+	return IRQ_HANDLED;
+}
+
+static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
+{
+	pci_iounmap(pdev, hw->db_vaddr);
+	pci_iounmap(pdev, hw->ram_vaddr);
+	pci_iounmap(pdev, hw->mmio_vaddr);
+}
+
+static int ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
+{
+	int bar;
+	unsigned long off;
+
+	/* map the memory mapped i/o registers */
+	hw->mmio_vaddr = pci_iomap(pdev, 1, 0);
+	if (hw->mmio_vaddr == NULL) {
+		dev_err(&pdev->dev, "Error mapping mmio\n");
+		goto out;
+	}
+
+	/* map the adapter shared memory region */
+	if (pdev->subsystem_device == 0x00E4) {
+		bar = 5;
+		/* Last 8k is reserved for CCBs */
+		off = pci_resource_len(pdev, bar) - 0x2000;
+	} else {
+		bar = 2;
+		off = 0;
+	}
+	hw->ram_vaddr = pci_iomap_range(pdev, bar, off, max_ccb * ILOHW_CCB_SZ);
+	if (hw->ram_vaddr == NULL) {
+		dev_err(&pdev->dev, "Error mapping shared mem\n");
+		goto mmio_free;
+	}
+
+	/* map the doorbell aperture */
+	hw->db_vaddr = pci_iomap(pdev, 3, max_ccb * ONE_DB_SIZE);
+	if (hw->db_vaddr == NULL) {
+		dev_err(&pdev->dev, "Error mapping doorbell\n");
+		goto ram_free;
+	}
+
+	return 0;
+ram_free:
+	pci_iounmap(pdev, hw->ram_vaddr);
+mmio_free:
+	pci_iounmap(pdev, hw->mmio_vaddr);
+out:
+	return -ENOMEM;
+}
+
+static void ilo_remove(struct pci_dev *pdev)
+{
+	int i, minor;
+	struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev);
+
+	if (!ilo_hw)
+		return;
+
+	clear_device(ilo_hw);
+
+	minor = MINOR(ilo_hw->cdev.dev);
+	for (i = minor; i < minor + max_ccb; i++)
+		device_destroy(ilo_class, MKDEV(ilo_major, i));
+
+	cdev_del(&ilo_hw->cdev);
+	ilo_disable_interrupts(ilo_hw);
+	free_irq(pdev->irq, ilo_hw);
+	ilo_unmap_device(pdev, ilo_hw);
+	pci_release_regions(pdev);
+	/*
+	 * pci_disable_device(pdev) used to be here. But this PCI device has
+	 * two functions with interrupt lines connected to a single pin. The
+	 * other one is a USB host controller. So when we disable the PIN here
+	 * e.g. by rmmod hpilo, the controller stops working. It is because
+	 * the interrupt link is disabled in ACPI since it is not refcounted
+	 * yet. See acpi_pci_link_free_irq called from acpi_pci_irq_disable.
+	 */
+	kfree(ilo_hw);
+	ilo_hwdev[(minor / max_ccb)] = 0;
+}
+
+static int ilo_probe(struct pci_dev *pdev,
+			       const struct pci_device_id *ent)
+{
+	int devnum, minor, start, error = 0;
+	struct ilo_hwinfo *ilo_hw;
+
+	/* Ignore subsystem_device = 0x1979 (set by BIOS)  */
+	if (pdev->subsystem_device == 0x1979)
+		return 0;
+
+	if (max_ccb > MAX_CCB)
+		max_ccb = MAX_CCB;
+	else if (max_ccb < MIN_CCB)
+		max_ccb = MIN_CCB;
+
+	/* find a free range for device files */
+	for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) {
+		if (ilo_hwdev[devnum] == 0) {
+			ilo_hwdev[devnum] = 1;
+			break;
+		}
+	}
+
+	if (devnum == MAX_ILO_DEV) {
+		dev_err(&pdev->dev, "Error finding free device\n");
+		return -ENODEV;
+	}
+
+	/* track global allocations for this device */
+	error = -ENOMEM;
+	ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL);
+	if (!ilo_hw)
+		goto out;
+
+	ilo_hw->ilo_dev = pdev;
+	spin_lock_init(&ilo_hw->alloc_lock);
+	spin_lock_init(&ilo_hw->fifo_lock);
+	spin_lock_init(&ilo_hw->open_lock);
+
+	error = pci_enable_device(pdev);
+	if (error)
+		goto free;
+
+	pci_set_master(pdev);
+
+	error = pci_request_regions(pdev, ILO_NAME);
+	if (error)
+		goto disable;
+
+	error = ilo_map_device(pdev, ilo_hw);
+	if (error)
+		goto free_regions;
+
+	pci_set_drvdata(pdev, ilo_hw);
+	clear_device(ilo_hw);
+
+	error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw);
+	if (error)
+		goto unmap;
+
+	ilo_enable_interrupts(ilo_hw);
+
+	cdev_init(&ilo_hw->cdev, &ilo_fops);
+	ilo_hw->cdev.owner = THIS_MODULE;
+	start = devnum * max_ccb;
+	error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), max_ccb);
+	if (error) {
+		dev_err(&pdev->dev, "Could not add cdev\n");
+		goto remove_isr;
+	}
+
+	for (minor = 0 ; minor < max_ccb; minor++) {
+		struct device *dev;
+		dev = device_create(ilo_class, &pdev->dev,
+				    MKDEV(ilo_major, minor), NULL,
+				    "hpilo!d%dccb%d", devnum, minor);
+		if (IS_ERR(dev))
+			dev_err(&pdev->dev, "Could not create files\n");
+	}
+
+	return 0;
+remove_isr:
+	ilo_disable_interrupts(ilo_hw);
+	free_irq(pdev->irq, ilo_hw);
+unmap:
+	ilo_unmap_device(pdev, ilo_hw);
+free_regions:
+	pci_release_regions(pdev);
+disable:
+/*	pci_disable_device(pdev);  see comment in ilo_remove */
+free:
+	kfree(ilo_hw);
+out:
+	ilo_hwdev[devnum] = 0;
+	return error;
+}
+
+static const struct pci_device_id ilo_devices[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) },
+	{ }
+};
+MODULE_DEVICE_TABLE(pci, ilo_devices);
+
+static struct pci_driver ilo_driver = {
+	.name 	  = ILO_NAME,
+	.id_table = ilo_devices,
+	.probe 	  = ilo_probe,
+	.remove   = ilo_remove,
+};
+
+static int __init ilo_init(void)
+{
+	int error;
+	dev_t dev;
+
+	ilo_class = class_create(THIS_MODULE, "iLO");
+	if (IS_ERR(ilo_class)) {
+		error = PTR_ERR(ilo_class);
+		goto out;
+	}
+
+	error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME);
+	if (error)
+		goto class_destroy;
+
+	ilo_major = MAJOR(dev);
+
+	error =	pci_register_driver(&ilo_driver);
+	if (error)
+		goto chr_remove;
+
+	return 0;
+chr_remove:
+	unregister_chrdev_region(dev, MAX_OPEN);
+class_destroy:
+	class_destroy(ilo_class);
+out:
+	return error;
+}
+
+static void __exit ilo_exit(void)
+{
+	pci_unregister_driver(&ilo_driver);
+	unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN);
+	class_destroy(ilo_class);
+}
+
+MODULE_VERSION("1.5.0");
+MODULE_ALIAS(ILO_NAME);
+MODULE_DESCRIPTION(ILO_NAME);
+MODULE_AUTHOR("David Altobelli <david.altobelli@hpe.com>");
+MODULE_LICENSE("GPL v2");
+
+module_param(max_ccb, uint, 0444);
+MODULE_PARM_DESC(max_ccb, "Maximum number of HP iLO channels to attach (8-24)(default=16)");
+
+module_init(ilo_init);
+module_exit(ilo_exit);