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Subject[PATCH 19/21] platform: goldfish: pipe: Add the goldfish_pipe_v1 driver
From
From: Roman Kiryanov <rkir@google.com>

This is the v1 goldfish pipe driver.

Signed-off-by: Roman Kiryanov <rkir@google.com>
---
drivers/platform/goldfish/Makefile | 3 +-
drivers/platform/goldfish/goldfish_pipe.c | 9 +-
.../platform/goldfish/goldfish_pipe_qemu.h | 27 +
drivers/platform/goldfish/goldfish_pipe_v1.c | 632 ++++++++++++++++++
drivers/platform/goldfish/goldfish_pipe_v1.h | 24 +
5 files changed, 690 insertions(+), 5 deletions(-)
create mode 100644 drivers/platform/goldfish/goldfish_pipe_v1.c
create mode 100644 drivers/platform/goldfish/goldfish_pipe_v1.h

diff --git a/drivers/platform/goldfish/Makefile b/drivers/platform/goldfish/Makefile
index 6a9f6e6de46d..acb105dbd9fd 100644
--- a/drivers/platform/goldfish/Makefile
+++ b/drivers/platform/goldfish/Makefile
@@ -1,4 +1,5 @@
#
# Makefile for Goldfish platform specific drivers
#
-obj-$(CONFIG_GOLDFISH_PIPE) += goldfish_pipe.o goldfish_pipe_v2.o
+obj-$(CONFIG_GOLDFISH_PIPE) += goldfish_pipe.o \
+ goldfish_pipe_v1.o goldfish_pipe_v2.o
diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
index d963b7485ce5..e45e262517a0 100644
--- a/drivers/platform/goldfish/goldfish_pipe.c
+++ b/drivers/platform/goldfish/goldfish_pipe.c
@@ -56,6 +56,7 @@
#include <linux/acpi.h>
#include "goldfish_pipe_qemu.h"
#include "goldfish_pipe.h"
+#include "goldfish_pipe_v1.h"
#include "goldfish_pipe_v2.h"

/*
@@ -105,10 +106,10 @@ static int goldfish_pipe_probe(struct platform_device *pdev)
writel((u32)PIPE_DRIVER_VERSION, base + PIPE_V2_REG_VERSION);
version = readl(base + PIPE_V2_REG_VERSION);

- if (WARN_ON(version < PIPE_CURRENT_DEVICE_VERSION))
- return -EINVAL;
-
- return goldfish_pipe_device_v2_init(pdev, base, irq);
+ if (version < PIPE_CURRENT_DEVICE_VERSION)
+ return goldfish_pipe_device_v1_init(pdev, base, irq);
+ else
+ return goldfish_pipe_device_v2_init(pdev, base, irq);
}

static int goldfish_pipe_remove(struct platform_device *pdev)
diff --git a/drivers/platform/goldfish/goldfish_pipe_qemu.h b/drivers/platform/goldfish/goldfish_pipe_qemu.h
index 599b69f0baa1..ed2c7938fede 100644
--- a/drivers/platform/goldfish/goldfish_pipe_qemu.h
+++ b/drivers/platform/goldfish/goldfish_pipe_qemu.h
@@ -62,6 +62,33 @@ enum PipeFlagsBits {
BIT_WAKE_ON_READ = 2, /* want to be woken on reads */
};

+enum PipeV1Regs {
+ /* write: value = command */
+ PIPE_V1_REG_COMMAND = 0x00,
+ /* read */
+ PIPE_V1_REG_STATUS = 0x04,
+ /* read/write: channel id */
+ PIPE_V1_REG_CHANNEL = 0x08,
+ /* read/write: channel id */
+ PIPE_V1_REG_CHANNEL_HIGH = 0x30,
+ /* read/write: buffer size */
+ PIPE_V1_REG_SIZE = 0x0C,
+ /* write: physical address */
+ PIPE_V1_REG_ADDRESS = 0x10,
+ /* write: physical address */
+ PIPE_V1_REG_ADDRESS_HIGH = 0x34,
+ /* read: wake flags */
+ PIPE_V1_REG_WAKES = 0x14,
+ /* read/write: batch data address */
+ PIPE_V1_REG_PARAMS_ADDR_LOW = 0x18,
+ /* read/write: batch data address */
+ PIPE_V1_REG_PARAMS_ADDR_HIGH = 0x1C,
+ /* write: batch access */
+ PIPE_V1_REG_ACCESS_PARAMS = 0x20,
+ /* read: device version */
+ PIPE_V1_REG_VERSION = 0x24,
+};
+
enum PipeV2Regs {
PIPE_V2_REG_CMD = 0,

diff --git a/drivers/platform/goldfish/goldfish_pipe_v1.c b/drivers/platform/goldfish/goldfish_pipe_v1.c
new file mode 100644
index 000000000000..6e603204dd62
--- /dev/null
+++ b/drivers/platform/goldfish/goldfish_pipe_v1.c
@@ -0,0 +1,632 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2011 Google, Inc.
+ * Copyright (C) 2012 Intel, Inc.
+ * Copyright (C) 2013 Intel, Inc.
+ * Copyright (C) 2014 Linaro Limited
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+/* This source file contains the implementation of the legacy version of
+ * a goldfish pipe device driver. See goldfish_pipe_v2.c for the current
+ * version.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/miscdevice.h>
+#include <linux/platform_device.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/bitops.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/dma-mapping.h>
+#include <linux/mm.h>
+#include <linux/bug.h>
+#include <linux/goldfish.h>
+#include "goldfish_pipe_qemu.h"
+#include "goldfish_pipe.h"
+
+#define MAX_PAGES_TO_GRAB 32
+
+/* A value that will not be set by qemu emulator */
+#define INITIAL_BATCH_RESULT (0xdeadbeaf)
+
+struct goldfish_pipe_dev;
+
+/* This data type models a given pipe instance */
+struct goldfish_pipe {
+ struct goldfish_pipe_dev *dev;
+
+ /* The wake flags pipe is waiting for
+ * Note: not protected with any lock, uses atomic operations
+ * and barriers to make it thread-safe.
+ */
+ unsigned long flags;
+
+ wait_queue_head_t wake_queue;
+
+ /* protects access to the pipe */
+ struct mutex lock;
+};
+
+struct access_params {
+ unsigned long channel;
+ u32 size;
+ unsigned long address;
+ u32 cmd;
+ u32 result;
+ /* reserved for future extension */
+ u32 flags;
+};
+
+/* The driver state. Holds a reference to the i/o page used to
+ * communicate with the emulator, and a wake queue for blocked tasks
+ * waiting to be awoken.
+ */
+struct goldfish_pipe_dev {
+ /* Needed for the 'remove' call */
+ struct goldfish_pipe_dev_base super;
+
+ /* ptr to platform device's device struct */
+ struct device *pdev_dev;
+
+ /* the base address for MMIO */
+ char __iomem *base;
+
+ struct access_params *aps;
+
+ struct miscdevice miscdev;
+
+ /* Global device spinlock */
+ spinlock_t lock;
+};
+
+static int goldfish_pipe_device_deinit(void *raw_dev,
+ struct platform_device *pdev);
+
+static u32 goldfish_cmd_status(struct goldfish_pipe *pipe, u32 cmd)
+{
+ unsigned long flags;
+ u32 status;
+ struct goldfish_pipe_dev *dev = pipe->dev;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ gf_write_ptr(pipe, dev->base + PIPE_V1_REG_CHANNEL,
+ dev->base + PIPE_V1_REG_CHANNEL_HIGH);
+ writel(cmd, dev->base + PIPE_V1_REG_COMMAND);
+ status = readl(dev->base + PIPE_V1_REG_STATUS);
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return status;
+}
+
+static void goldfish_cmd(struct goldfish_pipe *pipe, u32 cmd)
+{
+ unsigned long flags;
+ struct goldfish_pipe_dev *dev = pipe->dev;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ gf_write_ptr(pipe, dev->base + PIPE_V1_REG_CHANNEL,
+ dev->base + PIPE_V1_REG_CHANNEL_HIGH);
+ writel(cmd, dev->base + PIPE_V1_REG_COMMAND);
+ spin_unlock_irqrestore(&dev->lock, flags);
+}
+
+/* This function converts an error code returned by the emulator through
+ * the PIPE_V1_REG_STATUS i/o register into a valid negative errno value.
+ */
+static int goldfish_pipe_error_convert(int status)
+{
+ switch (status) {
+ case PIPE_ERROR_AGAIN:
+ return -EAGAIN;
+ case PIPE_ERROR_NOMEM:
+ return -ENOMEM;
+ case PIPE_ERROR_IO:
+ return -EIO;
+ default:
+ return -EINVAL;
+ }
+}
+
+/*
+ * Notice: QEMU will return 0 for un-known register access, indicating
+ * access_params is supported or not
+ */
+static int valid_batchbuffer_addr(struct goldfish_pipe_dev *dev,
+ struct access_params *aps)
+{
+ u32 aph, apl;
+ u64 paddr;
+
+ aph = readl(dev->base + PIPE_V1_REG_PARAMS_ADDR_HIGH);
+ apl = readl(dev->base + PIPE_V1_REG_PARAMS_ADDR_LOW);
+
+ paddr = ((u64)aph << 32) | apl;
+ return paddr == (__pa(aps));
+}
+
+static int setup_access_params_addr(struct platform_device *pdev,
+ struct goldfish_pipe_dev *dev)
+{
+ u64 paddr;
+ struct access_params *aps;
+
+ aps = devm_kzalloc(&pdev->dev, sizeof(struct access_params),
+ GFP_KERNEL);
+ if (!aps)
+ return -ENOMEM;
+
+ paddr = __pa(aps);
+ writel((u32)(paddr >> 32), dev->base + PIPE_V1_REG_PARAMS_ADDR_HIGH);
+ writel((u32)paddr, dev->base + PIPE_V1_REG_PARAMS_ADDR_LOW);
+
+ if (valid_batchbuffer_addr(dev, aps)) {
+ dev->aps = aps;
+ return 0;
+ }
+
+ devm_kfree(&pdev->dev, aps);
+ return -EFAULT;
+}
+
+static int access_with_param(struct goldfish_pipe_dev *dev, const int cmd,
+ unsigned long address, unsigned long avail,
+ struct goldfish_pipe *pipe, int *status)
+{
+ struct access_params *aps = dev->aps;
+
+ if (!aps)
+ return -EINVAL;
+
+ aps->result = INITIAL_BATCH_RESULT;
+ aps->channel = (unsigned long)pipe;
+ aps->size = avail;
+ aps->address = address;
+ aps->cmd = cmd;
+ writel(cmd, dev->base + PIPE_V1_REG_ACCESS_PARAMS);
+
+ /*
+ * If the aps->result has not changed, that means
+ * that the batch command failed
+ */
+ if (aps->result == INITIAL_BATCH_RESULT)
+ return -EINVAL;
+
+ *status = aps->result;
+ return 0;
+}
+
+static int transfer_pages(struct goldfish_pipe_dev *dev,
+ struct goldfish_pipe *pipe,
+ int cmd,
+ unsigned long xaddr,
+ unsigned long size)
+{
+ unsigned long irq_flags;
+ int status = 0;
+
+ spin_lock_irqsave(&dev->lock, irq_flags);
+ if (access_with_param(dev, cmd, xaddr, size, pipe, &status)) {
+ gf_write_ptr(pipe, dev->base + PIPE_V1_REG_CHANNEL,
+ dev->base + PIPE_V1_REG_CHANNEL_HIGH);
+
+ writel(size, dev->base + PIPE_V1_REG_SIZE);
+
+ gf_write_ptr((void *)xaddr,
+ dev->base + PIPE_V1_REG_ADDRESS,
+ dev->base + PIPE_V1_REG_ADDRESS_HIGH);
+
+ writel(cmd, dev->base + PIPE_V1_REG_COMMAND);
+
+ status = readl(dev->base + PIPE_V1_REG_STATUS);
+ }
+ spin_unlock_irqrestore(&dev->lock, irq_flags);
+
+ return status;
+}
+
+static unsigned long translate_address(const struct page *page,
+ unsigned long addr)
+{
+ return page_to_phys(page) | (addr & ~PAGE_MASK);
+}
+
+static ssize_t goldfish_pipe_read_write(struct file *filp, char __user *buffer,
+ size_t bufflen, int is_write)
+{
+ struct goldfish_pipe *pipe = filp->private_data;
+ struct goldfish_pipe_dev *dev = pipe->dev;
+ unsigned long address;
+ unsigned long address_end;
+ const int wake_bit = is_write ? BIT_WAKE_ON_WRITE : BIT_WAKE_ON_READ;
+ const int pipe_cmd = is_write ? PIPE_CMD_WRITE : PIPE_CMD_READ;
+ int count = 0;
+ int ret = -EINVAL;
+
+ /* If the emulator already closed the pipe, no need to go further */
+ if (test_bit(BIT_CLOSED_ON_HOST, &pipe->flags))
+ return -EIO;
+
+ /* Null reads or writes succeeds */
+ if (unlikely(bufflen == 0))
+ return 0;
+
+ /* Check the buffer range for access */
+ if (!access_ok(is_write ? VERIFY_WRITE : VERIFY_READ,
+ buffer, bufflen))
+ return -EFAULT;
+
+ address = (unsigned long)buffer;
+ address_end = address + bufflen;
+
+ /* Serialize access to the pipe */
+ if (mutex_lock_interruptible(&pipe->lock))
+ return -ERESTARTSYS;
+
+ while (address < address_end) {
+ struct page *pages[MAX_PAGES_TO_GRAB];
+ unsigned long page_end = (address & PAGE_MASK) + PAGE_SIZE;
+ unsigned long avail;
+ unsigned long xaddr;
+ unsigned long xaddr_prev;
+ long first_page;
+ long last_page;
+ long requested_pages;
+ int status;
+ int n_pages;
+ int page_i;
+ int num_contiguous_pages;
+
+ /*
+ * Attempt to grab multiple physically contiguous pages.
+ */
+ first_page = address & PAGE_MASK;
+ last_page = (address_end - 1) & PAGE_MASK;
+ requested_pages =
+ min(((last_page - first_page) >> PAGE_SHIFT) + 1,
+ (long)MAX_PAGES_TO_GRAB);
+
+ ret = get_user_pages_fast(first_page, requested_pages,
+ !is_write, pages);
+ if (ret < 0) {
+ dev_err(dev->pdev_dev,
+ "%s: get_user_pages_fast failed: %d\n",
+ __func__, ret);
+ break;
+ } else if (!ret) {
+ dev_err(dev->pdev_dev,
+ "%s: error: no pages returned, requested %ld\n",
+ __func__, requested_pages);
+ break;
+ }
+
+ n_pages = ret;
+ xaddr = translate_address(pages[0], address);
+ xaddr_prev = xaddr;
+ num_contiguous_pages = 1;
+ for (page_i = 1; page_i < n_pages; page_i++) {
+ unsigned long xaddr_i;
+
+ xaddr_i = translate_address(pages[page_i], address);
+ if (xaddr_i == xaddr_prev + PAGE_SIZE) {
+ page_end += PAGE_SIZE;
+ xaddr_prev = xaddr_i;
+ num_contiguous_pages++;
+ } else {
+ dev_err(dev->pdev_dev,
+ "%s: discontinuous page boundary: %d "
+ "pages instead\n",
+ __func__, page_i);
+ break;
+ }
+ }
+ avail = min(page_end, address_end) - address;
+
+ status = transfer_pages(dev, pipe, pipe_cmd, xaddr, avail);
+
+ for (page_i = 0; page_i < n_pages; page_i++) {
+ if (status > 0 && !is_write &&
+ page_i < num_contiguous_pages)
+ set_page_dirty(pages[page_i]);
+
+ put_page(pages[page_i]);
+ }
+
+ if (status > 0) { /* Correct transfer */
+ count += status;
+ address += status;
+ continue;
+ } else if (status == 0) { /* EOF */
+ ret = 0;
+ break;
+ } else if (status < 0 && count > 0) {
+ /*
+ * An error occurred and we already transferred
+ * something on one of the previous pages.
+ * Just return what we already copied and log this
+ * err.
+ *
+ * Note: This seems like an incorrect approach but
+ * cannot change it until we check if any user space
+ * ABI relies on this behavior.
+ */
+ if (status != PIPE_ERROR_AGAIN)
+ dev_err_ratelimited(dev->pdev_dev,
+ "backend returned error %d on %s\n",
+ status, is_write ? "write" : "read");
+ ret = 0;
+ break;
+ }
+
+ /*
+ * If the error is not PIPE_ERROR_AGAIN, or if we are not in
+ * non-blocking mode, just return the error code.
+ */
+ if (status != PIPE_ERROR_AGAIN ||
+ (filp->f_flags & O_NONBLOCK) != 0) {
+ ret = goldfish_pipe_error_convert(status);
+ break;
+ }
+
+ /*
+ * The backend blocked the read/write, wait until the backend
+ * tells us it's ready to process more data.
+ */
+ set_bit(wake_bit, &pipe->flags);
+
+ /* Tell the emulator we're going to wait for a wake event */
+ goldfish_cmd(pipe, pipe_cmd);
+
+ /* Unlock the pipe, then wait for the wake signal */
+ mutex_unlock(&pipe->lock);
+
+ while (test_bit(wake_bit, &pipe->flags)) {
+ if (wait_event_interruptible(pipe->wake_queue,
+ !test_bit(wake_bit, &pipe->flags)))
+ return -ERESTARTSYS;
+
+ if (test_bit(BIT_CLOSED_ON_HOST, &pipe->flags))
+ return -EIO;
+ }
+
+ /* Try to re-acquire the lock */
+ if (mutex_lock_interruptible(&pipe->lock))
+ return -ERESTARTSYS;
+ }
+ mutex_unlock(&pipe->lock);
+
+ return (ret < 0) ? ret : count;
+}
+
+static ssize_t goldfish_pipe_read(struct file *filp, char __user *buffer,
+ size_t bufflen, loff_t *ppos)
+{
+ return goldfish_pipe_read_write(filp, buffer, bufflen,
+ /* is_write */ 0);
+}
+
+static ssize_t goldfish_pipe_write(struct file *filp,
+ const char __user *buffer, size_t bufflen,
+ loff_t *ppos)
+{
+ return goldfish_pipe_read_write(filp, (char __user *)buffer,
+ bufflen, /* is_write */ 1);
+}
+
+static __poll_t goldfish_pipe_poll(struct file *filp, poll_table *wait)
+{
+ struct goldfish_pipe *pipe = filp->private_data;
+ __poll_t mask = 0;
+ int status;
+
+ if (mutex_lock_interruptible(&pipe->lock))
+ return -ERESTARTSYS;
+
+ poll_wait(filp, &pipe->wake_queue, wait);
+
+ status = goldfish_cmd_status(pipe, PIPE_CMD_POLL);
+
+ mutex_unlock(&pipe->lock);
+
+ if (status & PIPE_POLL_IN)
+ mask |= EPOLLIN | EPOLLRDNORM;
+
+ if (status & PIPE_POLL_OUT)
+ mask |= EPOLLOUT | EPOLLWRNORM;
+
+ if (status & PIPE_POLL_HUP)
+ mask |= EPOLLHUP;
+
+ if (test_bit(BIT_CLOSED_ON_HOST, &pipe->flags))
+ mask |= EPOLLERR;
+
+ return mask;
+}
+
+static irqreturn_t goldfish_pipe_interrupt(int irq, void *dev_id)
+{
+ struct goldfish_pipe_dev *dev = dev_id;
+ unsigned long irq_flags;
+ int count = 0;
+
+ /*
+ * We're going to read from the emulator a list of (channel,flags)
+ * pairs corresponding to the wake events that occurred on each
+ * blocked pipe (i.e. channel).
+ */
+ spin_lock_irqsave(&dev->lock, irq_flags);
+ for (;;) {
+ /* First read the channel, 0 means the end of the list */
+ struct goldfish_pipe *pipe;
+ unsigned long wakes;
+ unsigned long channel = 0;
+
+#ifdef CONFIG_64BIT
+ channel =
+ (u64)readl(dev->base + PIPE_V1_REG_CHANNEL_HIGH) << 32;
+#endif
+ channel |= readl(dev->base + PIPE_V1_REG_CHANNEL);
+ if (!channel)
+ break;
+
+ /* Convert channel to struct pipe pointer + read wake flags */
+ wakes = readl(dev->base + PIPE_V1_REG_WAKES);
+ pipe = (struct goldfish_pipe *)(ptrdiff_t)channel;
+
+ /* Did the emulator just closed a pipe? */
+ if (wakes & PIPE_WAKE_CLOSED) {
+ set_bit(BIT_CLOSED_ON_HOST, &pipe->flags);
+ wakes |= PIPE_WAKE_READ | PIPE_WAKE_WRITE;
+ }
+ if (wakes & PIPE_WAKE_READ)
+ clear_bit(BIT_WAKE_ON_READ, &pipe->flags);
+ if (wakes & PIPE_WAKE_WRITE)
+ clear_bit(BIT_WAKE_ON_WRITE, &pipe->flags);
+
+ wake_up_interruptible(&pipe->wake_queue);
+ count++;
+ }
+ spin_unlock_irqrestore(&dev->lock, irq_flags);
+
+ return (count == 0) ? IRQ_NONE : IRQ_HANDLED;
+}
+
+/* A helper function to get the instance of goldfish_pipe_dev from file */
+static struct goldfish_pipe_dev *to_goldfish_pipe_dev(struct file *file)
+{
+ struct miscdevice *miscdev = file->private_data;
+
+ return container_of(miscdev, struct goldfish_pipe_dev, miscdev);
+}
+
+/**
+ * goldfish_pipe_open - open a channel to the AVD
+ * @inode: inode of device
+ * @file: file struct of opener
+ *
+ * Create a new pipe link between the emulator and the use application.
+ * Each new request produces a new pipe.
+ *
+ * Note: we use the pipe ID as a mux. All goldfish emulations are 32bit
+ * right now so this is fine. A move to 64bit will need this addressing
+ */
+static int goldfish_pipe_open(struct inode *inode, struct file *file)
+{
+ struct goldfish_pipe_dev *dev = to_goldfish_pipe_dev(file);
+ struct goldfish_pipe *pipe;
+ int status;
+
+ /* Allocate new pipe kernel object */
+ pipe = kzalloc(sizeof(*pipe), GFP_KERNEL);
+ if (!pipe)
+ return -ENOMEM;
+
+ pipe->dev = dev;
+ init_waitqueue_head(&pipe->wake_queue);
+ mutex_init(&pipe->lock);
+
+ /*
+ * Now, tell the emulator we're opening a new pipe. We use the
+ * pipe object's address as the channel identifier for simplicity.
+ */
+
+ status = goldfish_cmd_status(pipe, PIPE_CMD_OPEN);
+ if (status < 0) {
+ kfree(pipe);
+ return status;
+ }
+
+ /* All is done, save the pipe into the file's private data field */
+ file->private_data = pipe;
+ return 0;
+}
+
+static int goldfish_pipe_release(struct inode *inode, struct file *filp)
+{
+ struct goldfish_pipe *pipe = filp->private_data;
+
+ pr_debug("%s: call. pipe=%p file=%p\n", __func__, pipe, filp);
+ /* The guest is closing the channel, so tell the emulator right now */
+ goldfish_cmd(pipe, PIPE_CMD_CLOSE);
+ kfree(pipe);
+ filp->private_data = NULL;
+ return 0;
+}
+
+static const struct file_operations goldfish_pipe_fops = {
+ .owner = THIS_MODULE,
+ .read = goldfish_pipe_read,
+ .write = goldfish_pipe_write,
+ .poll = goldfish_pipe_poll,
+ .open = goldfish_pipe_open,
+ .release = goldfish_pipe_release,
+};
+
+static void init_miscdevice(struct miscdevice *miscdev)
+{
+ memset(miscdev, 0, sizeof(*miscdev));
+
+ miscdev->minor = MISC_DYNAMIC_MINOR;
+ miscdev->name = DEVICE_NAME;
+ miscdev->fops = &goldfish_pipe_fops;
+};
+
+static int goldfish_pipe_device_deinit(void *raw_dev,
+ struct platform_device *pdev);
+
+int goldfish_pipe_device_v1_init(struct platform_device *pdev,
+ void __iomem *base,
+ int irq)
+{
+ struct goldfish_pipe_dev *dev;
+ int err;
+
+ dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ dev->super.deinit = &goldfish_pipe_device_deinit;
+ dev->pdev_dev = &pdev->dev;
+ spin_lock_init(&dev->lock);
+
+ err = devm_request_irq(&pdev->dev, irq,
+ &goldfish_pipe_interrupt, IRQF_SHARED,
+ DEVICE_NAME, dev);
+ if (err) {
+ dev_err(&pdev->dev, "unable to allocate IRQ for v1\n");
+ return err;
+ }
+
+ init_miscdevice(&dev->miscdev);
+ err = misc_register(&dev->miscdev);
+ if (err) {
+ dev_err(&pdev->dev, "unable to register v1 device\n");
+ return err;
+ }
+
+ setup_access_params_addr(pdev, dev);
+
+ platform_set_drvdata(pdev, dev);
+ return 0;
+}
+
+static int goldfish_pipe_device_deinit(void *raw_dev,
+ struct platform_device *pdev)
+{
+ struct goldfish_pipe_dev *dev = raw_dev;
+
+ misc_deregister(&dev->miscdev);
+ return 0;
+}
diff --git a/drivers/platform/goldfish/goldfish_pipe_v1.h b/drivers/platform/goldfish/goldfish_pipe_v1.h
new file mode 100644
index 000000000000..6d61441e2a7f
--- /dev/null
+++ b/drivers/platform/goldfish/goldfish_pipe_v1.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2018 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#ifndef GOLDFISH_PIPE_V1_H
+#define GOLDFISH_PIPE_V1_H
+
+/* The entry point to the pipe v1 driver */
+int goldfish_pipe_device_v1_init(struct platform_device *pdev,
+ void __iomem *base,
+ int irq);
+
+#endif /* #define GOLDFISH_PIPE_V1_H */
--
2.19.0.397.gdd90340f6a-goog
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