These changes are the raw update to linux-4.4.6-rt14. Kernel sources

are taken from kernel.org, and rt patch from the rt wiki download page.

During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

4 files changed, 0 insertions, 2706 deletions

diff --git a/kernel/drivers/misc/carma/Kconfig b/kernel/drivers/misc/carma/Kconfig
deleted file mode 100644
index 295882bfb..000000000
--- a/kernel/drivers/misc/carma/Kconfig
+++ /dev/null
@@ -1,15 +0,0 @@
-config CARMA_FPGA
-	tristate "CARMA DATA-FPGA Access Driver"
-	depends on FSL_SOC && PPC_83xx && HAS_DMA && FSL_DMA
-	default n
-	help
-	  Say Y here to include support for communicating with the data
-	  processing FPGAs on the OVRO CARMA board.
-
-config CARMA_FPGA_PROGRAM
-	tristate "CARMA DATA-FPGA Programmer"
-	depends on FSL_SOC && PPC_83xx && HAS_DMA && FSL_DMA
-	default n
-	help
-	  Say Y here to include support for programming the data processing
-	  FPGAs on the OVRO CARMA board.
diff --git a/kernel/drivers/misc/carma/Makefile b/kernel/drivers/misc/carma/Makefile
deleted file mode 100644
index ff36ac2ce..000000000
--- a/kernel/drivers/misc/carma/Makefile
+++ /dev/null
@@ -1,2 +0,0 @@
-obj-$(CONFIG_CARMA_FPGA)		+= carma-fpga.o
-obj-$(CONFIG_CARMA_FPGA_PROGRAM)	+= carma-fpga-program.o
diff --git a/kernel/drivers/misc/carma/carma-fpga-program.c b/kernel/drivers/misc/carma/carma-fpga-program.c
deleted file mode 100644
index 0b1bd85e4..000000000
--- a/kernel/drivers/misc/carma/carma-fpga-program.c
+++ /dev/null
@@ -1,1182 +0,0 @@
-/*
- * CARMA Board DATA-FPGA Programmer
- *
- * Copyright (c) 2009-2011 Ira W. Snyder <iws@ovro.caltech.edu>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- */
-
-#include <linux/dma-mapping.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/of_platform.h>
-#include <linux/completion.h>
-#include <linux/miscdevice.h>
-#include <linux/dmaengine.h>
-#include <linux/fsldma.h>
-#include <linux/interrupt.h>
-#include <linux/highmem.h>
-#include <linux/vmalloc.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-#include <linux/leds.h>
-#include <linux/slab.h>
-#include <linux/kref.h>
-#include <linux/fs.h>
-#include <linux/io.h>
-
-/* MPC8349EMDS specific get_immrbase() */
-#include <sysdev/fsl_soc.h>
-
-static const char drv_name[] = "carma-fpga-program";
-
-/*
- * Firmware images are always this exact size
- *
- * 12849552 bytes for a CARMA Digitizer Board (EP2S90 FPGAs)
- * 18662880 bytes for a CARMA Correlator Board (EP2S130 FPGAs)
- */
-#define FW_SIZE_EP2S90		12849552
-#define FW_SIZE_EP2S130		18662880
-
-struct fpga_dev {
-	struct miscdevice miscdev;
-
-	/* Reference count */
-	struct kref ref;
-
-	/* Device Registers */
-	struct device *dev;
-	void __iomem *regs;
-	void __iomem *immr;
-
-	/* Freescale DMA Device */
-	struct dma_chan *chan;
-
-	/* Interrupts */
-	int irq, status;
-	struct completion completion;
-
-	/* FPGA Bitfile */
-	struct mutex lock;
-
-	void *vaddr;
-	struct scatterlist *sglist;
-	int sglen;
-	int nr_pages;
-	bool buf_allocated;
-
-	/* max size and written bytes */
-	size_t fw_size;
-	size_t bytes;
-};
-
-static int fpga_dma_init(struct fpga_dev *priv, int nr_pages)
-{
-	struct page *pg;
-	int i;
-
-	priv->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
-	if (NULL == priv->vaddr) {
-		pr_debug("vmalloc_32(%d pages) failed\n", nr_pages);
-		return -ENOMEM;
-	}
-
-	pr_debug("vmalloc is at addr 0x%08lx, size=%d\n",
-				(unsigned long)priv->vaddr,
-				nr_pages << PAGE_SHIFT);
-
-	memset(priv->vaddr, 0, nr_pages << PAGE_SHIFT);
-	priv->nr_pages = nr_pages;
-
-	priv->sglist = vzalloc(priv->nr_pages * sizeof(*priv->sglist));
-	if (NULL == priv->sglist)
-		goto vzalloc_err;
-
-	sg_init_table(priv->sglist, priv->nr_pages);
-	for (i = 0; i < priv->nr_pages; i++) {
-		pg = vmalloc_to_page(priv->vaddr + i * PAGE_SIZE);
-		if (NULL == pg)
-			goto vmalloc_to_page_err;
-		sg_set_page(&priv->sglist[i], pg, PAGE_SIZE, 0);
-	}
-	return 0;
-
-vmalloc_to_page_err:
-	vfree(priv->sglist);
-	priv->sglist = NULL;
-vzalloc_err:
-	vfree(priv->vaddr);
-	priv->vaddr = NULL;
-	return -ENOMEM;
-}
-
-static int fpga_dma_map(struct fpga_dev *priv)
-{
-	priv->sglen = dma_map_sg(priv->dev, priv->sglist,
-			priv->nr_pages, DMA_TO_DEVICE);
-
-	if (0 == priv->sglen) {
-		pr_warn("%s: dma_map_sg failed\n", __func__);
-		return -ENOMEM;
-	}
-	return 0;
-}
-
-static int fpga_dma_unmap(struct fpga_dev *priv)
-{
-	if (!priv->sglen)
-		return 0;
-
-	dma_unmap_sg(priv->dev, priv->sglist, priv->sglen, DMA_TO_DEVICE);
-	priv->sglen = 0;
-	return 0;
-}
-
-/*
- * FPGA Bitfile Helpers
- */
-
-/**
- * fpga_drop_firmware_data() - drop the bitfile image from memory
- * @priv: the driver's private data structure
- *
- * LOCKING: must hold priv->lock
- */
-static void fpga_drop_firmware_data(struct fpga_dev *priv)
-{
-	vfree(priv->sglist);
-	vfree(priv->vaddr);
-	priv->buf_allocated = false;
-	priv->bytes = 0;
-}
-
-/*
- * Private Data Reference Count
- */
-
-static void fpga_dev_remove(struct kref *ref)
-{
-	struct fpga_dev *priv = container_of(ref, struct fpga_dev, ref);
-
-	/* free any firmware image that was not programmed */
-	fpga_drop_firmware_data(priv);
-
-	mutex_destroy(&priv->lock);
-	kfree(priv);
-}
-
-/*
- * LED Trigger (could be a seperate module)
- */
-
-/*
- * NOTE: this whole thing does have the problem that whenever the led's are
- * NOTE: first set to use the fpga trigger, they could be in the wrong state
- */
-
-DEFINE_LED_TRIGGER(ledtrig_fpga);
-
-static void ledtrig_fpga_programmed(bool enabled)
-{
-	if (enabled)
-		led_trigger_event(ledtrig_fpga, LED_FULL);
-	else
-		led_trigger_event(ledtrig_fpga, LED_OFF);
-}
-
-/*
- * FPGA Register Helpers
- */
-
-/* Register Definitions */
-#define FPGA_CONFIG_CONTROL		0x40
-#define FPGA_CONFIG_STATUS		0x44
-#define FPGA_CONFIG_FIFO_SIZE		0x48
-#define FPGA_CONFIG_FIFO_USED		0x4C
-#define FPGA_CONFIG_TOTAL_BYTE_COUNT	0x50
-#define FPGA_CONFIG_CUR_BYTE_COUNT	0x54
-
-#define FPGA_FIFO_ADDRESS		0x3000
-
-static int fpga_fifo_size(void __iomem *regs)
-{
-	return ioread32be(regs + FPGA_CONFIG_FIFO_SIZE);
-}
-
-#define CFG_STATUS_ERR_MASK	0xfffe
-
-static int fpga_config_error(void __iomem *regs)
-{
-	return ioread32be(regs + FPGA_CONFIG_STATUS) & CFG_STATUS_ERR_MASK;
-}
-
-static int fpga_fifo_empty(void __iomem *regs)
-{
-	return ioread32be(regs + FPGA_CONFIG_FIFO_USED) == 0;
-}
-
-static void fpga_fifo_write(void __iomem *regs, u32 val)
-{
-	iowrite32be(val, regs + FPGA_FIFO_ADDRESS);
-}
-
-static void fpga_set_byte_count(void __iomem *regs, u32 count)
-{
-	iowrite32be(count, regs + FPGA_CONFIG_TOTAL_BYTE_COUNT);
-}
-
-#define CFG_CTL_ENABLE	(1 << 0)
-#define CFG_CTL_RESET	(1 << 1)
-#define CFG_CTL_DMA	(1 << 2)
-
-static void fpga_programmer_enable(struct fpga_dev *priv, bool dma)
-{
-	u32 val;
-
-	val = (dma) ? (CFG_CTL_ENABLE | CFG_CTL_DMA) : CFG_CTL_ENABLE;
-	iowrite32be(val, priv->regs + FPGA_CONFIG_CONTROL);
-}
-
-static void fpga_programmer_disable(struct fpga_dev *priv)
-{
-	iowrite32be(0x0, priv->regs + FPGA_CONFIG_CONTROL);
-}
-
-static void fpga_dump_registers(struct fpga_dev *priv)
-{
-	u32 control, status, size, used, total, curr;
-
-	/* good status: do nothing */
-	if (priv->status == 0)
-		return;
-
-	/* Dump all status registers */
-	control = ioread32be(priv->regs + FPGA_CONFIG_CONTROL);
-	status = ioread32be(priv->regs + FPGA_CONFIG_STATUS);
-	size = ioread32be(priv->regs + FPGA_CONFIG_FIFO_SIZE);
-	used = ioread32be(priv->regs + FPGA_CONFIG_FIFO_USED);
-	total = ioread32be(priv->regs + FPGA_CONFIG_TOTAL_BYTE_COUNT);
-	curr = ioread32be(priv->regs + FPGA_CONFIG_CUR_BYTE_COUNT);
-
-	dev_err(priv->dev, "Configuration failed, dumping status registers\n");
-	dev_err(priv->dev, "Control:    0x%.8x\n", control);
-	dev_err(priv->dev, "Status:     0x%.8x\n", status);
-	dev_err(priv->dev, "FIFO Size:  0x%.8x\n", size);
-	dev_err(priv->dev, "FIFO Used:  0x%.8x\n", used);
-	dev_err(priv->dev, "FIFO Total: 0x%.8x\n", total);
-	dev_err(priv->dev, "FIFO Curr:  0x%.8x\n", curr);
-}
-
-/*
- * FPGA Power Supply Code
- */
-
-#define CTL_PWR_CONTROL		0x2006
-#define CTL_PWR_STATUS		0x200A
-#define CTL_PWR_FAIL		0x200B
-
-#define PWR_CONTROL_ENABLE	0x01
-
-#define PWR_STATUS_ERROR_MASK	0x10
-#define PWR_STATUS_GOOD		0x0f
-
-/*
- * Determine if the FPGA power is good for all supplies
- */
-static bool fpga_power_good(struct fpga_dev *priv)
-{
-	u8 val;
-
-	val = ioread8(priv->regs + CTL_PWR_STATUS);
-	if (val & PWR_STATUS_ERROR_MASK)
-		return false;
-
-	return val == PWR_STATUS_GOOD;
-}
-
-/*
- * Disable the FPGA power supplies
- */
-static void fpga_disable_power_supplies(struct fpga_dev *priv)
-{
-	unsigned long start;
-	u8 val;
-
-	iowrite8(0x0, priv->regs + CTL_PWR_CONTROL);
-
-	/*
-	 * Wait 500ms for the power rails to discharge
-	 *
-	 * Without this delay, the CTL-CPLD state machine can get into a
-	 * state where it is waiting for the power-goods to assert, but they
-	 * never do. This only happens when enabling and disabling the
-	 * power sequencer very rapidly.
-	 *
-	 * The loop below will also wait for the power goods to de-assert,
-	 * but testing has shown that they are always disabled by the time
-	 * the sleep completes. However, omitting the sleep and only waiting
-	 * for the power-goods to de-assert was not sufficient to ensure
-	 * that the power sequencer would not wedge itself.
-	 */
-	msleep(500);
-
-	start = jiffies;
-	while (time_before(jiffies, start + HZ)) {
-		val = ioread8(priv->regs + CTL_PWR_STATUS);
-		if (!(val & PWR_STATUS_GOOD))
-			break;
-
-		usleep_range(5000, 10000);
-	}
-
-	val = ioread8(priv->regs + CTL_PWR_STATUS);
-	if (val & PWR_STATUS_GOOD) {
-		dev_err(priv->dev, "power disable failed: "
-				   "power goods: status 0x%.2x\n", val);
-	}
-
-	if (val & PWR_STATUS_ERROR_MASK) {
-		dev_err(priv->dev, "power disable failed: "
-				   "alarm bit set: status 0x%.2x\n", val);
-	}
-}
-
-/**
- * fpga_enable_power_supplies() - enable the DATA-FPGA power supplies
- * @priv: the driver's private data structure
- *
- * Enable the DATA-FPGA power supplies, waiting up to 1 second for
- * them to enable successfully.
- *
- * Returns 0 on success, -ERRNO otherwise
- */
-static int fpga_enable_power_supplies(struct fpga_dev *priv)
-{
-	unsigned long start = jiffies;
-
-	if (fpga_power_good(priv)) {
-		dev_dbg(priv->dev, "power was already good\n");
-		return 0;
-	}
-
-	iowrite8(PWR_CONTROL_ENABLE, priv->regs + CTL_PWR_CONTROL);
-	while (time_before(jiffies, start + HZ)) {
-		if (fpga_power_good(priv))
-			return 0;
-
-		usleep_range(5000, 10000);
-	}
-
-	return fpga_power_good(priv) ? 0 : -ETIMEDOUT;
-}
-
-/*
- * Determine if the FPGA power supplies are all enabled
- */
-static bool fpga_power_enabled(struct fpga_dev *priv)
-{
-	u8 val;
-
-	val = ioread8(priv->regs + CTL_PWR_CONTROL);
-	if (val & PWR_CONTROL_ENABLE)
-		return true;
-
-	return false;
-}
-
-/*
- * Determine if the FPGA's are programmed and running correctly
- */
-static bool fpga_running(struct fpga_dev *priv)
-{
-	if (!fpga_power_good(priv))
-		return false;
-
-	/* Check the config done bit */
-	return ioread32be(priv->regs + FPGA_CONFIG_STATUS) & (1 << 18);
-}
-
-/*
- * FPGA Programming Code
- */
-
-/**
- * fpga_program_block() - put a block of data into the programmer's FIFO
- * @priv: the driver's private data structure
- * @buf: the data to program
- * @count: the length of data to program (must be a multiple of 4 bytes)
- *
- * Returns 0 on success, -ERRNO otherwise
- */
-static int fpga_program_block(struct fpga_dev *priv, void *buf, size_t count)
-{
-	u32 *data = buf;
-	int size = fpga_fifo_size(priv->regs);
-	int i, len;
-	unsigned long timeout;
-
-	/* enforce correct data length for the FIFO */
-	BUG_ON(count % 4 != 0);
-
-	while (count > 0) {
-
-		/* Get the size of the block to write (maximum is FIFO_SIZE) */
-		len = min_t(size_t, count, size);
-		timeout = jiffies + HZ / 4;
-
-		/* Write the block */
-		for (i = 0; i < len / 4; i++)
-			fpga_fifo_write(priv->regs, data[i]);
-
-		/* Update the amounts left */
-		count -= len;
-		data += len / 4;
-
-		/* Wait for the fifo to empty */
-		while (true) {
-
-			if (fpga_fifo_empty(priv->regs)) {
-				break;
-			} else {
-				dev_dbg(priv->dev, "Fifo not empty\n");
-				cpu_relax();
-			}
-
-			if (fpga_config_error(priv->regs)) {
-				dev_err(priv->dev, "Error detected\n");
-				return -EIO;
-			}
-
-			if (time_after(jiffies, timeout)) {
-				dev_err(priv->dev, "Fifo drain timeout\n");
-				return -ETIMEDOUT;
-			}
-
-			usleep_range(5000, 10000);
-		}
-	}
-
-	return 0;
-}
-
-/**
- * fpga_program_cpu() - program the DATA-FPGA's using the CPU
- * @priv: the driver's private data structure
- *
- * This is useful when the DMA programming method fails. It is possible to
- * wedge the Freescale DMA controller such that the DMA programming method
- * always fails. This method has always succeeded.
- *
- * Returns 0 on success, -ERRNO otherwise
- */
-static noinline int fpga_program_cpu(struct fpga_dev *priv)
-{
-	int ret;
-	unsigned long timeout;
-
-	/* Disable the programmer */
-	fpga_programmer_disable(priv);
-
-	/* Set the total byte count */
-	fpga_set_byte_count(priv->regs, priv->bytes);
-	dev_dbg(priv->dev, "total byte count %u bytes\n", priv->bytes);
-
-	/* Enable the controller for programming */
-	fpga_programmer_enable(priv, false);
-	dev_dbg(priv->dev, "enabled the controller\n");
-
-	/* Write each chunk of the FPGA bitfile to FPGA programmer */
-	ret = fpga_program_block(priv, priv->vaddr, priv->bytes);
-	if (ret)
-		goto out_disable_controller;
-
-	/* Wait for the interrupt handler to signal that programming finished */
-	timeout = wait_for_completion_timeout(&priv->completion, 2 * HZ);
-	if (!timeout) {
-		dev_err(priv->dev, "Timed out waiting for completion\n");
-		ret = -ETIMEDOUT;
-		goto out_disable_controller;
-	}
-
-	/* Retrieve the status from the interrupt handler */
-	ret = priv->status;
-
-out_disable_controller:
-	fpga_programmer_disable(priv);
-	return ret;
-}
-
-#define FIFO_DMA_ADDRESS	0xf0003000
-#define FIFO_MAX_LEN		4096
-
-/**
- * fpga_program_dma() - program the DATA-FPGA's using the DMA engine
- * @priv: the driver's private data structure
- *
- * Program the DATA-FPGA's using the Freescale DMA engine. This requires that
- * the engine is programmed such that the hardware DMA request lines can
- * control the entire DMA transaction. The system controller FPGA then
- * completely offloads the programming from the CPU.
- *
- * Returns 0 on success, -ERRNO otherwise
- */
-static noinline int fpga_program_dma(struct fpga_dev *priv)
-{
-	struct dma_chan *chan = priv->chan;
-	struct dma_async_tx_descriptor *tx;
-	size_t num_pages, len, avail = 0;
-	struct dma_slave_config config;
-	struct scatterlist *sg;
-	struct sg_table table;
-	dma_cookie_t cookie;
-	int ret, i;
-	unsigned long timeout;
-
-	/* Disable the programmer */
-	fpga_programmer_disable(priv);
-
-	/* Allocate a scatterlist for the DMA destination */
-	num_pages = DIV_ROUND_UP(priv->bytes, FIFO_MAX_LEN);
-	ret = sg_alloc_table(&table, num_pages, GFP_KERNEL);
-	if (ret) {
-		dev_err(priv->dev, "Unable to allocate dst scatterlist\n");
-		ret = -ENOMEM;
-		goto out_return;
-	}
-
-	/*
-	 * This is an ugly hack
-	 *
-	 * We fill in a scatterlist as if it were mapped for DMA. This is
-	 * necessary because there exists no better structure for this
-	 * inside the kernel code.
-	 *
-	 * As an added bonus, we can use the DMAEngine API for all of this,
-	 * rather than inventing another extremely similar API.
-	 */
-	avail = priv->bytes;
-	for_each_sg(table.sgl, sg, num_pages, i) {
-		len = min_t(size_t, avail, FIFO_MAX_LEN);
-		sg_dma_address(sg) = FIFO_DMA_ADDRESS;
-		sg_dma_len(sg) = len;
-
-		avail -= len;
-	}
-
-	/* Map the buffer for DMA */
-	ret = fpga_dma_map(priv);
-	if (ret) {
-		dev_err(priv->dev, "Unable to map buffer for DMA\n");
-		goto out_free_table;
-	}
-
-	/*
-	 * Configure the DMA channel to transfer FIFO_SIZE / 2 bytes per
-	 * transaction, and then put it under external control
-	 */
-	memset(&config, 0, sizeof(config));
-	config.direction = DMA_MEM_TO_DEV;
-	config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-	config.dst_maxburst = fpga_fifo_size(priv->regs) / 2 / 4;
-	ret = dmaengine_slave_config(chan, &config);
-	if (ret) {
-		dev_err(priv->dev, "DMA slave configuration failed\n");
-		goto out_dma_unmap;
-	}
-
-	ret = fsl_dma_external_start(chan, 1);
-	if (ret) {
-		dev_err(priv->dev, "DMA external control setup failed\n");
-		goto out_dma_unmap;
-	}
-
-	/* setup and submit the DMA transaction */
-
-	tx = dmaengine_prep_dma_sg(chan, table.sgl, num_pages,
-			priv->sglist, priv->sglen, 0);
-	if (!tx) {
-		dev_err(priv->dev, "Unable to prep DMA transaction\n");
-		ret = -ENOMEM;
-		goto out_dma_unmap;
-	}
-
-	cookie = tx->tx_submit(tx);
-	if (dma_submit_error(cookie)) {
-		dev_err(priv->dev, "Unable to submit DMA transaction\n");
-		ret = -ENOMEM;
-		goto out_dma_unmap;
-	}
-
-	dma_async_issue_pending(chan);
-
-	/* Set the total byte count */
-	fpga_set_byte_count(priv->regs, priv->bytes);
-	dev_dbg(priv->dev, "total byte count %u bytes\n", priv->bytes);
-
-	/* Enable the controller for DMA programming */
-	fpga_programmer_enable(priv, true);
-	dev_dbg(priv->dev, "enabled the controller\n");
-
-	/* Wait for the interrupt handler to signal that programming finished */
-	timeout = wait_for_completion_timeout(&priv->completion, 2 * HZ);
-	if (!timeout) {
-		dev_err(priv->dev, "Timed out waiting for completion\n");
-		ret = -ETIMEDOUT;
-		goto out_disable_controller;
-	}
-
-	/* Retrieve the status from the interrupt handler */
-	ret = priv->status;
-
-out_disable_controller:
-	fpga_programmer_disable(priv);
-out_dma_unmap:
-	fpga_dma_unmap(priv);
-out_free_table:
-	sg_free_table(&table);
-out_return:
-	return ret;
-}
-
-/*
- * Interrupt Handling
- */
-
-static irqreturn_t fpga_irq(int irq, void *dev_id)
-{
-	struct fpga_dev *priv = dev_id;
-
-	/* Save the status */
-	priv->status = fpga_config_error(priv->regs) ? -EIO : 0;
-	dev_dbg(priv->dev, "INTERRUPT status %d\n", priv->status);
-	fpga_dump_registers(priv);
-
-	/* Disabling the programmer clears the interrupt */
-	fpga_programmer_disable(priv);
-
-	/* Notify any waiters */
-	complete(&priv->completion);
-
-	return IRQ_HANDLED;
-}
-
-/*
- * SYSFS Helpers
- */
-
-/**
- * fpga_do_stop() - deconfigure (reset) the DATA-FPGA's
- * @priv: the driver's private data structure
- *
- * LOCKING: must hold priv->lock
- */
-static int fpga_do_stop(struct fpga_dev *priv)
-{
-	u32 val;
-
-	/* Set the led to unprogrammed */
-	ledtrig_fpga_programmed(false);
-
-	/* Pulse the config line to reset the FPGA's */
-	val = CFG_CTL_ENABLE | CFG_CTL_RESET;
-	iowrite32be(val, priv->regs + FPGA_CONFIG_CONTROL);
-	iowrite32be(0x0, priv->regs + FPGA_CONFIG_CONTROL);
-
-	return 0;
-}
-
-static noinline int fpga_do_program(struct fpga_dev *priv)
-{
-	int ret;
-
-	if (priv->bytes != priv->fw_size) {
-		dev_err(priv->dev, "Incorrect bitfile size: got %zu bytes, "
-				   "should be %zu bytes\n",
-				   priv->bytes, priv->fw_size);
-		return -EINVAL;
-	}
-
-	if (!fpga_power_enabled(priv)) {
-		dev_err(priv->dev, "Power not enabled\n");
-		return -EINVAL;
-	}
-
-	if (!fpga_power_good(priv)) {
-		dev_err(priv->dev, "Power not good\n");
-		return -EINVAL;
-	}
-
-	/* Set the LED to unprogrammed */
-	ledtrig_fpga_programmed(false);
-
-	/* Try to program the FPGA's using DMA */
-	ret = fpga_program_dma(priv);
-
-	/* If DMA failed or doesn't exist, try with CPU */
-	if (ret) {
-		dev_warn(priv->dev, "Falling back to CPU programming\n");
-		ret = fpga_program_cpu(priv);
-	}
-
-	if (ret) {
-		dev_err(priv->dev, "Unable to program FPGA's\n");
-		return ret;
-	}
-
-	/* Drop the firmware bitfile from memory */
-	fpga_drop_firmware_data(priv);
-
-	dev_dbg(priv->dev, "FPGA programming successful\n");
-	ledtrig_fpga_programmed(true);
-
-	return 0;
-}
-
-/*
- * File Operations
- */
-
-static int fpga_open(struct inode *inode, struct file *filp)
-{
-	/*
-	 * The miscdevice layer puts our struct miscdevice into the
-	 * filp->private_data field. We use this to find our private
-	 * data and then overwrite it with our own private structure.
-	 */
-	struct fpga_dev *priv = container_of(filp->private_data,
-					     struct fpga_dev, miscdev);
-	unsigned int nr_pages;
-	int ret;
-
-	/* We only allow one process at a time */
-	ret = mutex_lock_interruptible(&priv->lock);
-	if (ret)
-		return ret;
-
-	filp->private_data = priv;
-	kref_get(&priv->ref);
-
-	/* Truncation: drop any existing data */
-	if (filp->f_flags & O_TRUNC)
-		priv->bytes = 0;
-
-	/* Check if we have already allocated a buffer */
-	if (priv->buf_allocated)
-		return 0;
-
-	/* Allocate a buffer to hold enough data for the bitfile */
-	nr_pages = DIV_ROUND_UP(priv->fw_size, PAGE_SIZE);
-	ret = fpga_dma_init(priv, nr_pages);
-	if (ret) {
-		dev_err(priv->dev, "unable to allocate data buffer\n");
-		mutex_unlock(&priv->lock);
-		kref_put(&priv->ref, fpga_dev_remove);
-		return ret;
-	}
-
-	priv->buf_allocated = true;
-	return 0;
-}
-
-static int fpga_release(struct inode *inode, struct file *filp)
-{
-	struct fpga_dev *priv = filp->private_data;
-
-	mutex_unlock(&priv->lock);
-	kref_put(&priv->ref, fpga_dev_remove);
-	return 0;
-}
-
-static ssize_t fpga_write(struct file *filp, const char __user *buf,
-			  size_t count, loff_t *f_pos)
-{
-	struct fpga_dev *priv = filp->private_data;
-
-	/* FPGA bitfiles have an exact size: disallow anything else */
-	if (priv->bytes >= priv->fw_size)
-		return -ENOSPC;
-
-	count = min_t(size_t, priv->fw_size - priv->bytes, count);
-	if (copy_from_user(priv->vaddr + priv->bytes, buf, count))
-		return -EFAULT;
-
-	priv->bytes += count;
-	return count;
-}
-
-static ssize_t fpga_read(struct file *filp, char __user *buf, size_t count,
-			 loff_t *f_pos)
-{
-	struct fpga_dev *priv = filp->private_data;
-	return simple_read_from_buffer(buf, count, f_pos,
-				       priv->vaddr, priv->bytes);
-}
-
-static loff_t fpga_llseek(struct file *filp, loff_t offset, int origin)
-{
-	struct fpga_dev *priv = filp->private_data;
-
-	/* only read-only opens are allowed to seek */
-	if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
-		return -EINVAL;
-
-	return fixed_size_llseek(filp, offset, origin, priv->fw_size);
-}
-
-static const struct file_operations fpga_fops = {
-	.open		= fpga_open,
-	.release	= fpga_release,
-	.write		= fpga_write,
-	.read		= fpga_read,
-	.llseek		= fpga_llseek,
-};
-
-/*
- * Device Attributes
- */
-
-static ssize_t pfail_show(struct device *dev, struct device_attribute *attr,
-			  char *buf)
-{
-	struct fpga_dev *priv = dev_get_drvdata(dev);
-	u8 val;
-
-	val = ioread8(priv->regs + CTL_PWR_FAIL);
-	return snprintf(buf, PAGE_SIZE, "0x%.2x\n", val);
-}
-
-static ssize_t pgood_show(struct device *dev, struct device_attribute *attr,
-			  char *buf)
-{
-	struct fpga_dev *priv = dev_get_drvdata(dev);
-	return snprintf(buf, PAGE_SIZE, "%d\n", fpga_power_good(priv));
-}
-
-static ssize_t penable_show(struct device *dev, struct device_attribute *attr,
-			    char *buf)
-{
-	struct fpga_dev *priv = dev_get_drvdata(dev);
-	return snprintf(buf, PAGE_SIZE, "%d\n", fpga_power_enabled(priv));
-}
-
-static ssize_t penable_store(struct device *dev, struct device_attribute *attr,
-			     const char *buf, size_t count)
-{
-	struct fpga_dev *priv = dev_get_drvdata(dev);
-	unsigned long val;
-	int ret;
-
-	ret = kstrtoul(buf, 0, &val);
-	if (ret)
-		return ret;
-
-	if (val) {
-		ret = fpga_enable_power_supplies(priv);
-		if (ret)
-			return ret;
-	} else {
-		fpga_do_stop(priv);
-		fpga_disable_power_supplies(priv);
-	}
-
-	return count;
-}
-
-static ssize_t program_show(struct device *dev, struct device_attribute *attr,
-			    char *buf)
-{
-	struct fpga_dev *priv = dev_get_drvdata(dev);
-	return snprintf(buf, PAGE_SIZE, "%d\n", fpga_running(priv));
-}
-
-static ssize_t program_store(struct device *dev, struct device_attribute *attr,
-			     const char *buf, size_t count)
-{
-	struct fpga_dev *priv = dev_get_drvdata(dev);
-	unsigned long val;
-	int ret;
-
-	ret = kstrtoul(buf, 0, &val);
-	if (ret)
-		return ret;
-
-	/* We can't have an image writer and be programming simultaneously */
-	if (mutex_lock_interruptible(&priv->lock))
-		return -ERESTARTSYS;
-
-	/* Program or Reset the FPGA's */
-	ret = val ? fpga_do_program(priv) : fpga_do_stop(priv);
-	if (ret)
-		goto out_unlock;
-
-	/* Success */
-	ret = count;
-
-out_unlock:
-	mutex_unlock(&priv->lock);
-	return ret;
-}
-
-static DEVICE_ATTR(power_fail, S_IRUGO, pfail_show, NULL);
-static DEVICE_ATTR(power_good, S_IRUGO, pgood_show, NULL);
-static DEVICE_ATTR(power_enable, S_IRUGO | S_IWUSR,
-		   penable_show, penable_store);
-
-static DEVICE_ATTR(program, S_IRUGO | S_IWUSR,
-		   program_show, program_store);
-
-static struct attribute *fpga_attributes[] = {
-	&dev_attr_power_fail.attr,
-	&dev_attr_power_good.attr,
-	&dev_attr_power_enable.attr,
-	&dev_attr_program.attr,
-	NULL,
-};
-
-static const struct attribute_group fpga_attr_group = {
-	.attrs = fpga_attributes,
-};
-
-/*
- * OpenFirmware Device Subsystem
- */
-
-#define SYS_REG_VERSION		0x00
-#define SYS_REG_GEOGRAPHIC	0x10
-
-static bool dma_filter(struct dma_chan *chan, void *data)
-{
-	/*
-	 * DMA Channel #0 is the only acceptable device
-	 *
-	 * This probably won't survive an unload/load cycle of the Freescale
-	 * DMAEngine driver, but that won't be a problem
-	 */
-	return chan->chan_id == 0 && chan->device->dev_id == 0;
-}
-
-static int fpga_of_remove(struct platform_device *op)
-{
-	struct fpga_dev *priv = platform_get_drvdata(op);
-	struct device *this_device = priv->miscdev.this_device;
-
-	sysfs_remove_group(&this_device->kobj, &fpga_attr_group);
-	misc_deregister(&priv->miscdev);
-
-	free_irq(priv->irq, priv);
-	irq_dispose_mapping(priv->irq);
-
-	/* make sure the power supplies are off */
-	fpga_disable_power_supplies(priv);
-
-	/* unmap registers */
-	iounmap(priv->immr);
-	iounmap(priv->regs);
-
-	dma_release_channel(priv->chan);
-
-	/* drop our reference to the private data structure */
-	kref_put(&priv->ref, fpga_dev_remove);
-	return 0;
-}
-
-/* CTL-CPLD Version Register */
-#define CTL_CPLD_VERSION	0x2000
-
-static int fpga_of_probe(struct platform_device *op)
-{
-	struct device_node *of_node = op->dev.of_node;
-	struct device *this_device;
-	struct fpga_dev *priv;
-	dma_cap_mask_t mask;
-	u32 ver;
-	int ret;
-
-	/* Allocate private data */
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv) {
-		dev_err(&op->dev, "Unable to allocate private data\n");
-		ret = -ENOMEM;
-		goto out_return;
-	}
-
-	/* Setup the miscdevice */
-	priv->miscdev.minor = MISC_DYNAMIC_MINOR;
-	priv->miscdev.name = drv_name;
-	priv->miscdev.fops = &fpga_fops;
-
-	kref_init(&priv->ref);
-
-	platform_set_drvdata(op, priv);
-	priv->dev = &op->dev;
-	mutex_init(&priv->lock);
-	init_completion(&priv->completion);
-
-	dev_set_drvdata(priv->dev, priv);
-	dma_cap_zero(mask);
-	dma_cap_set(DMA_MEMCPY, mask);
-	dma_cap_set(DMA_SLAVE, mask);
-	dma_cap_set(DMA_SG, mask);
-
-	/* Get control of DMA channel #0 */
-	priv->chan = dma_request_channel(mask, dma_filter, NULL);
-	if (!priv->chan) {
-		dev_err(&op->dev, "Unable to acquire DMA channel #0\n");
-		ret = -ENODEV;
-		goto out_free_priv;
-	}
-
-	/* Remap the registers for use */
-	priv->regs = of_iomap(of_node, 0);
-	if (!priv->regs) {
-		dev_err(&op->dev, "Unable to ioremap registers\n");
-		ret = -ENOMEM;
-		goto out_dma_release_channel;
-	}
-
-	/* Remap the IMMR for use */
-	priv->immr = ioremap(get_immrbase(), 0x100000);
-	if (!priv->immr) {
-		dev_err(&op->dev, "Unable to ioremap IMMR\n");
-		ret = -ENOMEM;
-		goto out_unmap_regs;
-	}
-
-	/*
-	 * Check that external DMA is configured
-	 *
-	 * U-Boot does this for us, but we should check it and bail out if
-	 * there is a problem. Failing to have this register setup correctly
-	 * will cause the DMA controller to transfer a single cacheline
-	 * worth of data, then wedge itself.
-	 */
-	if ((ioread32be(priv->immr + 0x114) & 0xE00) != 0xE00) {
-		dev_err(&op->dev, "External DMA control not configured\n");
-		ret = -ENODEV;
-		goto out_unmap_immr;
-	}
-
-	/*
-	 * Check the CTL-CPLD version
-	 *
-	 * This driver uses the CTL-CPLD DATA-FPGA power sequencer, and we
-	 * don't want to run on any version of the CTL-CPLD that does not use
-	 * a compatible register layout.
-	 *
-	 * v2: changed register layout, added power sequencer
-	 * v3: added glitch filter on the i2c overcurrent/overtemp outputs
-	 */
-	ver = ioread8(priv->regs + CTL_CPLD_VERSION);
-	if (ver != 0x02 && ver != 0x03) {
-		dev_err(&op->dev, "CTL-CPLD is not version 0x02 or 0x03!\n");
-		ret = -ENODEV;
-		goto out_unmap_immr;
-	}
-
-	/* Set the exact size that the firmware image should be */
-	ver = ioread32be(priv->regs + SYS_REG_VERSION);
-	priv->fw_size = (ver & (1 << 18)) ? FW_SIZE_EP2S130 : FW_SIZE_EP2S90;
-
-	/* Find the correct IRQ number */
-	priv->irq = irq_of_parse_and_map(of_node, 0);
-	if (priv->irq == NO_IRQ) {
-		dev_err(&op->dev, "Unable to find IRQ line\n");
-		ret = -ENODEV;
-		goto out_unmap_immr;
-	}
-
-	/* Request the IRQ */
-	ret = request_irq(priv->irq, fpga_irq, IRQF_SHARED, drv_name, priv);
-	if (ret) {
-		dev_err(&op->dev, "Unable to request IRQ %d\n", priv->irq);
-		ret = -ENODEV;
-		goto out_irq_dispose_mapping;
-	}
-
-	/* Reset and stop the FPGA's, just in case */
-	fpga_do_stop(priv);
-
-	/* Register the miscdevice */
-	ret = misc_register(&priv->miscdev);
-	if (ret) {
-		dev_err(&op->dev, "Unable to register miscdevice\n");
-		goto out_free_irq;
-	}
-
-	/* Create the sysfs files */
-	this_device = priv->miscdev.this_device;
-	dev_set_drvdata(this_device, priv);
-	ret = sysfs_create_group(&this_device->kobj, &fpga_attr_group);
-	if (ret) {
-		dev_err(&op->dev, "Unable to create sysfs files\n");
-		goto out_misc_deregister;
-	}
-
-	dev_info(priv->dev, "CARMA FPGA Programmer: %s rev%s with %s FPGAs\n",
-			(ver & (1 << 17)) ? "Correlator" : "Digitizer",
-			(ver & (1 << 16)) ? "B" : "A",
-			(ver & (1 << 18)) ? "EP2S130" : "EP2S90");
-
-	return 0;
-
-out_misc_deregister:
-	misc_deregister(&priv->miscdev);
-out_free_irq:
-	free_irq(priv->irq, priv);
-out_irq_dispose_mapping:
-	irq_dispose_mapping(priv->irq);
-out_unmap_immr:
-	iounmap(priv->immr);
-out_unmap_regs:
-	iounmap(priv->regs);
-out_dma_release_channel:
-	dma_release_channel(priv->chan);
-out_free_priv:
-	kref_put(&priv->ref, fpga_dev_remove);
-out_return:
-	return ret;
-}
-
-static const struct of_device_id fpga_of_match[] = {
-	{ .compatible = "carma,fpga-programmer", },
-	{},
-};
-
-static struct platform_driver fpga_of_driver = {
-	.probe		= fpga_of_probe,
-	.remove		= fpga_of_remove,
-	.driver		= {
-		.name		= drv_name,
-		.of_match_table	= fpga_of_match,
-	},
-};
-
-/*
- * Module Init / Exit
- */
-
-static int __init fpga_init(void)
-{
-	led_trigger_register_simple("fpga", &ledtrig_fpga);
-	return platform_driver_register(&fpga_of_driver);
-}
-
-static void __exit fpga_exit(void)
-{
-	platform_driver_unregister(&fpga_of_driver);
-	led_trigger_unregister_simple(ledtrig_fpga);
-}
-
-MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
-MODULE_DESCRIPTION("CARMA Board DATA-FPGA Programmer");
-MODULE_LICENSE("GPL");
-
-module_init(fpga_init);
-module_exit(fpga_exit);
diff --git a/kernel/drivers/misc/carma/carma-fpga.c b/kernel/drivers/misc/carma/carma-fpga.c
deleted file mode 100644
index 5aba3fd78..000000000
--- a/kernel/drivers/misc/carma/carma-fpga.c
+++ /dev/null
@@ -1,1507 +0,0 @@
-/*
- * CARMA DATA-FPGA Access Driver
- *
- * Copyright (c) 2009-2011 Ira W. Snyder <iws@ovro.caltech.edu>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- */
-
-/*
- * FPGA Memory Dump Format
- *
- * FPGA #0 control registers (32 x 32-bit words)
- * FPGA #1 control registers (32 x 32-bit words)
- * FPGA #2 control registers (32 x 32-bit words)
- * FPGA #3 control registers (32 x 32-bit words)
- * SYSFPGA control registers (32 x 32-bit words)
- * FPGA #0 correlation array (NUM_CORL0 correlation blocks)
- * FPGA #1 correlation array (NUM_CORL1 correlation blocks)
- * FPGA #2 correlation array (NUM_CORL2 correlation blocks)
- * FPGA #3 correlation array (NUM_CORL3 correlation blocks)
- *
- * Each correlation array consists of:
- *
- * Correlation Data      (2 x NUM_LAGSn x 32-bit words)
- * Pipeline Metadata     (2 x NUM_METAn x 32-bit words)
- * Quantization Counters (2 x NUM_QCNTn x 32-bit words)
- *
- * The NUM_CORLn, NUM_LAGSn, NUM_METAn, and NUM_QCNTn values come from
- * the FPGA configuration registers. They do not change once the FPGA's
- * have been programmed, they only change on re-programming.
- */
-
-/*
- * Basic Description:
- *
- * This driver is used to capture correlation spectra off of the four data
- * processing FPGAs. The FPGAs are often reprogrammed at runtime, therefore
- * this driver supports dynamic enable/disable of capture while the device
- * remains open.
- *
- * The nominal capture rate is 64Hz (every 15.625ms). To facilitate this fast
- * capture rate, all buffers are pre-allocated to avoid any potentially long
- * running memory allocations while capturing.
- *
- * There are two lists and one pointer which are used to keep track of the
- * different states of data buffers.
- *
- * 1) free list
- * This list holds all empty data buffers which are ready to receive data.
- *
- * 2) inflight pointer
- * This pointer holds the currently inflight data buffer. This buffer is having
- * data copied into it by the DMA engine.
- *
- * 3) used list
- * This list holds data buffers which have been filled, and are waiting to be
- * read by userspace.
- *
- * All buffers start life on the free list, then move successively to the
- * inflight pointer, and then to the used list. After they have been read by
- * userspace, they are moved back to the free list. The cycle repeats as long
- * as necessary.
- *
- * It should be noted that all buffers are mapped and ready for DMA when they
- * are on any of the three lists. They are only unmapped when they are in the
- * process of being read by userspace.
- */
-
-/*
- * Notes on the IRQ masking scheme:
- *
- * The IRQ masking scheme here is different than most other hardware. The only
- * way for the DATA-FPGAs to detect if the kernel has taken too long to copy
- * the data is if the status registers are not cleared before the next
- * correlation data dump is ready.
- *
- * The interrupt line is connected to the status registers, such that when they
- * are cleared, the interrupt is de-asserted. Therein lies our problem. We need
- * to schedule a long-running DMA operation and return from the interrupt
- * handler quickly, but we cannot clear the status registers.
- *
- * To handle this, the system controller FPGA has the capability to connect the
- * interrupt line to a user-controlled GPIO pin. This pin is driven high
- * (unasserted) and left that way. To mask the interrupt, we change the
- * interrupt source to the GPIO pin. Tada, we hid the interrupt. :)
- */
-
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/of_platform.h>
-#include <linux/dma-mapping.h>
-#include <linux/miscdevice.h>
-#include <linux/interrupt.h>
-#include <linux/dmaengine.h>
-#include <linux/seq_file.h>
-#include <linux/highmem.h>
-#include <linux/debugfs.h>
-#include <linux/vmalloc.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/poll.h>
-#include <linux/slab.h>
-#include <linux/kref.h>
-#include <linux/io.h>
-
-/* system controller registers */
-#define SYS_IRQ_SOURCE_CTL	0x24
-#define SYS_IRQ_OUTPUT_EN	0x28
-#define SYS_IRQ_OUTPUT_DATA	0x2C
-#define SYS_IRQ_INPUT_DATA	0x30
-#define SYS_FPGA_CONFIG_STATUS	0x44
-
-/* GPIO IRQ line assignment */
-#define IRQ_CORL_DONE		0x10
-
-/* FPGA registers */
-#define MMAP_REG_VERSION	0x00
-#define MMAP_REG_CORL_CONF1	0x08
-#define MMAP_REG_CORL_CONF2	0x0C
-#define MMAP_REG_STATUS		0x48
-
-#define SYS_FPGA_BLOCK		0xF0000000
-
-#define DATA_FPGA_START		0x400000
-#define DATA_FPGA_SIZE		0x80000
-
-static const char drv_name[] = "carma-fpga";
-
-#define NUM_FPGA	4
-
-#define MIN_DATA_BUFS	8
-#define MAX_DATA_BUFS	64
-
-struct fpga_info {
-	unsigned int num_lag_ram;
-	unsigned int blk_size;
-};
-
-struct data_buf {
-	struct list_head entry;
-	void *vaddr;
-	struct scatterlist *sglist;
-	int sglen;
-	int nr_pages;
-	size_t size;
-};
-
-struct fpga_device {
-	/* character device */
-	struct miscdevice miscdev;
-	struct device *dev;
-	struct mutex mutex;
-
-	/* reference count */
-	struct kref ref;
-
-	/* FPGA registers and information */
-	struct fpga_info info[NUM_FPGA];
-	void __iomem *regs;
-	int irq;
-
-	/* FPGA Physical Address/Size Information */
-	resource_size_t phys_addr;
-	size_t phys_size;
-
-	/* DMA structures */
-	struct sg_table corl_table;
-	unsigned int corl_nents;
-	struct dma_chan *chan;
-
-	/* Protection for all members below */
-	spinlock_t lock;
-
-	/* Device enable/disable flag */
-	bool enabled;
-
-	/* Correlation data buffers */
-	wait_queue_head_t wait;
-	struct list_head free;
-	struct list_head used;
-	struct data_buf *inflight;
-
-	/* Information about data buffers */
-	unsigned int num_dropped;
-	unsigned int num_buffers;
-	size_t bufsize;
-	struct dentry *dbg_entry;
-};
-
-struct fpga_reader {
-	struct fpga_device *priv;
-	struct data_buf *buf;
-	off_t buf_start;
-};
-
-static void fpga_device_release(struct kref *ref)
-{
-	struct fpga_device *priv = container_of(ref, struct fpga_device, ref);
-
-	/* the last reader has exited, cleanup the last bits */
-	mutex_destroy(&priv->mutex);
-	kfree(priv);
-}
-
-/*
- * Data Buffer Allocation Helpers
- */
-
-static int carma_dma_init(struct data_buf *buf, int nr_pages)
-{
-	struct page *pg;
-	int i;
-
-	buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
-	if (NULL == buf->vaddr) {
-		pr_debug("vmalloc_32(%d pages) failed\n", nr_pages);
-		return -ENOMEM;
-	}
-
-	pr_debug("vmalloc is at addr 0x%08lx, size=%d\n",
-				(unsigned long)buf->vaddr,
-				nr_pages << PAGE_SHIFT);
-
-	memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
-	buf->nr_pages = nr_pages;
-
-	buf->sglist = vzalloc(buf->nr_pages * sizeof(*buf->sglist));
-	if (NULL == buf->sglist)
-		goto vzalloc_err;
-
-	sg_init_table(buf->sglist, buf->nr_pages);
-	for (i = 0; i < buf->nr_pages; i++) {
-		pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
-		if (NULL == pg)
-			goto vmalloc_to_page_err;
-		sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
-	}
-	return 0;
-
-vmalloc_to_page_err:
-	vfree(buf->sglist);
-	buf->sglist = NULL;
-vzalloc_err:
-	vfree(buf->vaddr);
-	buf->vaddr = NULL;
-	return -ENOMEM;
-}
-
-static int carma_dma_map(struct device *dev, struct data_buf *buf)
-{
-	buf->sglen = dma_map_sg(dev, buf->sglist,
-			buf->nr_pages, DMA_FROM_DEVICE);
-
-	if (0 == buf->sglen) {
-		pr_warn("%s: dma_map_sg failed\n", __func__);
-		return -ENOMEM;
-	}
-	return 0;
-}
-
-static int carma_dma_unmap(struct device *dev, struct data_buf *buf)
-{
-	if (!buf->sglen)
-		return 0;
-
-	dma_unmap_sg(dev, buf->sglist, buf->sglen, DMA_FROM_DEVICE);
-	buf->sglen = 0;
-	return 0;
-}
-
-/**
- * data_free_buffer() - free a single data buffer and all allocated memory
- * @buf: the buffer to free
- *
- * This will free all of the pages allocated to the given data buffer, and
- * then free the structure itself
- */
-static void data_free_buffer(struct data_buf *buf)
-{
-	/* It is ok to free a NULL buffer */
-	if (!buf)
-		return;
-
-	/* free all memory */
-	vfree(buf->sglist);
-	vfree(buf->vaddr);
-	kfree(buf);
-}
-
-/**
- * data_alloc_buffer() - allocate and fill a data buffer with pages
- * @bytes: the number of bytes required
- *
- * This allocates all space needed for a data buffer. It must be mapped before
- * use in a DMA transaction using carma_dma_map().
- *
- * Returns NULL on failure
- */
-static struct data_buf *data_alloc_buffer(const size_t bytes)
-{
-	unsigned int nr_pages;
-	struct data_buf *buf;
-	int ret;
-
-	/* calculate the number of pages necessary */
-	nr_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
-
-	/* allocate the buffer structure */
-	buf = kzalloc(sizeof(*buf), GFP_KERNEL);
-	if (!buf)
-		goto out_return;
-
-	/* initialize internal fields */
-	INIT_LIST_HEAD(&buf->entry);
-	buf->size = bytes;
-
-	/* allocate the buffer */
-	ret = carma_dma_init(buf, nr_pages);
-	if (ret)
-		goto out_free_buf;
-
-	return buf;
-
-out_free_buf:
-	kfree(buf);
-out_return:
-	return NULL;
-}
-
-/**
- * data_free_buffers() - free all allocated buffers
- * @priv: the driver's private data structure
- *
- * Free all buffers allocated by the driver (except those currently in the
- * process of being read by userspace).
- *
- * LOCKING: must hold dev->mutex
- * CONTEXT: user
- */
-static void data_free_buffers(struct fpga_device *priv)
-{
-	struct data_buf *buf, *tmp;
-
-	/* the device should be stopped, no DMA in progress */
-	BUG_ON(priv->inflight != NULL);
-
-	list_for_each_entry_safe(buf, tmp, &priv->free, entry) {
-		list_del_init(&buf->entry);
-		carma_dma_unmap(priv->dev, buf);
-		data_free_buffer(buf);
-	}
-
-	list_for_each_entry_safe(buf, tmp, &priv->used, entry) {
-		list_del_init(&buf->entry);
-		carma_dma_unmap(priv->dev, buf);
-		data_free_buffer(buf);
-	}
-
-	priv->num_buffers = 0;
-	priv->bufsize = 0;
-}
-
-/**
- * data_alloc_buffers() - allocate 1 seconds worth of data buffers
- * @priv: the driver's private data structure
- *
- * Allocate enough buffers for a whole second worth of data
- *
- * This routine will attempt to degrade nicely by succeeding even if a full
- * second worth of data buffers could not be allocated, as long as a minimum
- * number were allocated. In this case, it will print a message to the kernel
- * log.
- *
- * The device must not be modifying any lists when this is called.
- *
- * CONTEXT: user
- * LOCKING: must hold dev->mutex
- *
- * Returns 0 on success, -ERRNO otherwise
- */
-static int data_alloc_buffers(struct fpga_device *priv)
-{
-	struct data_buf *buf;
-	int i, ret;
-
-	for (i = 0; i < MAX_DATA_BUFS; i++) {
-
-		/* allocate a buffer */
-		buf = data_alloc_buffer(priv->bufsize);
-		if (!buf)
-			break;
-
-		/* map it for DMA */
-		ret = carma_dma_map(priv->dev, buf);
-		if (ret) {
-			data_free_buffer(buf);
-			break;
-		}
-
-		/* add it to the list of free buffers */
-		list_add_tail(&buf->entry, &priv->free);
-		priv->num_buffers++;
-	}
-
-	/* Make sure we allocated the minimum required number of buffers */
-	if (priv->num_buffers < MIN_DATA_BUFS) {
-		dev_err(priv->dev, "Unable to allocate enough data buffers\n");
-		data_free_buffers(priv);
-		return -ENOMEM;
-	}
-
-	/* Warn if we are running in a degraded state, but do not fail */
-	if (priv->num_buffers < MAX_DATA_BUFS) {
-		dev_warn(priv->dev,
-			 "Unable to allocate %d buffers, using %d buffers instead\n",
-			 MAX_DATA_BUFS, i);
-	}
-
-	return 0;
-}
-
-/*
- * DMA Operations Helpers
- */
-
-/**
- * fpga_start_addr() - get the physical address a DATA-FPGA
- * @priv: the driver's private data structure
- * @fpga: the DATA-FPGA number (zero based)
- */
-static dma_addr_t fpga_start_addr(struct fpga_device *priv, unsigned int fpga)
-{
-	return priv->phys_addr + 0x400000 + (0x80000 * fpga);
-}
-
-/**
- * fpga_block_addr() - get the physical address of a correlation data block
- * @priv: the driver's private data structure
- * @fpga: the DATA-FPGA number (zero based)
- * @blknum: the correlation block number (zero based)
- */
-static dma_addr_t fpga_block_addr(struct fpga_device *priv, unsigned int fpga,
-				  unsigned int blknum)
-{
-	return fpga_start_addr(priv, fpga) + (0x10000 * (1 + blknum));
-}
-
-#define REG_BLOCK_SIZE	(32 * 4)
-
-/**
- * data_setup_corl_table() - create the scatterlist for correlation dumps
- * @priv: the driver's private data structure
- *
- * Create the scatterlist for transferring a correlation dump from the
- * DATA FPGAs. This structure will be reused for each buffer than needs
- * to be filled with correlation data.
- *
- * Returns 0 on success, -ERRNO otherwise
- */
-static int data_setup_corl_table(struct fpga_device *priv)
-{
-	struct sg_table *table = &priv->corl_table;
-	struct scatterlist *sg;
-	struct fpga_info *info;
-	int i, j, ret;
-
-	/* Calculate the number of entries needed */
-	priv->corl_nents = (1 + NUM_FPGA) * REG_BLOCK_SIZE;
-	for (i = 0; i < NUM_FPGA; i++)
-		priv->corl_nents += priv->info[i].num_lag_ram;
-
-	/* Allocate the scatterlist table */
-	ret = sg_alloc_table(table, priv->corl_nents, GFP_KERNEL);
-	if (ret) {
-		dev_err(priv->dev, "unable to allocate DMA table\n");
-		return ret;
-	}
-
-	/* Add the DATA FPGA registers to the scatterlist */
-	sg = table->sgl;
-	for (i = 0; i < NUM_FPGA; i++) {
-		sg_dma_address(sg) = fpga_start_addr(priv, i);
-		sg_dma_len(sg) = REG_BLOCK_SIZE;
-		sg = sg_next(sg);
-	}
-
-	/* Add the SYS-FPGA registers to the scatterlist */
-	sg_dma_address(sg) = SYS_FPGA_BLOCK;
-	sg_dma_len(sg) = REG_BLOCK_SIZE;
-	sg = sg_next(sg);
-
-	/* Add the FPGA correlation data blocks to the scatterlist */
-	for (i = 0; i < NUM_FPGA; i++) {
-		info = &priv->info[i];
-		for (j = 0; j < info->num_lag_ram; j++) {
-			sg_dma_address(sg) = fpga_block_addr(priv, i, j);
-			sg_dma_len(sg) = info->blk_size;
-			sg = sg_next(sg);
-		}
-	}
-
-	/*
-	 * All physical addresses and lengths are present in the structure
-	 * now. It can be reused for every FPGA DATA interrupt
-	 */
-	return 0;
-}
-
-/*
- * FPGA Register Access Helpers
- */
-
-static void fpga_write_reg(struct fpga_device *priv, unsigned int fpga,
-			   unsigned int reg, u32 val)
-{
-	const int fpga_start = DATA_FPGA_START + (fpga * DATA_FPGA_SIZE);
-	iowrite32be(val, priv->regs + fpga_start + reg);
-}
-
-static u32 fpga_read_reg(struct fpga_device *priv, unsigned int fpga,
-			 unsigned int reg)
-{
-	const int fpga_start = DATA_FPGA_START + (fpga * DATA_FPGA_SIZE);
-	return ioread32be(priv->regs + fpga_start + reg);
-}
-
-/**
- * data_calculate_bufsize() - calculate the data buffer size required
- * @priv: the driver's private data structure
- *
- * Calculate the total buffer size needed to hold a single block
- * of correlation data
- *
- * CONTEXT: user
- *
- * Returns 0 on success, -ERRNO otherwise
- */
-static int data_calculate_bufsize(struct fpga_device *priv)
-{
-	u32 num_corl, num_lags, num_meta, num_qcnt, num_pack;
-	u32 conf1, conf2, version;
-	u32 num_lag_ram, blk_size;
-	int i;
-
-	/* Each buffer starts with the 5 FPGA register areas */
-	priv->bufsize = (1 + NUM_FPGA) * REG_BLOCK_SIZE;
-
-	/* Read and store the configuration data for each FPGA */
-	for (i = 0; i < NUM_FPGA; i++) {
-		version = fpga_read_reg(priv, i, MMAP_REG_VERSION);
-		conf1 = fpga_read_reg(priv, i, MMAP_REG_CORL_CONF1);
-		conf2 = fpga_read_reg(priv, i, MMAP_REG_CORL_CONF2);
-
-		/* minor version 2 and later */
-		if ((version & 0x000000FF) >= 2) {
-			num_corl = (conf1 & 0x000000F0) >> 4;
-			num_pack = (conf1 & 0x00000F00) >> 8;
-			num_lags = (conf1 & 0x00FFF000) >> 12;
-			num_meta = (conf1 & 0x7F000000) >> 24;
-			num_qcnt = (conf2 & 0x00000FFF) >> 0;
-		} else {
-			num_corl = (conf1 & 0x000000F0) >> 4;
-			num_pack = 1; /* implied */
-			num_lags = (conf1 & 0x000FFF00) >> 8;
-			num_meta = (conf1 & 0x7FF00000) >> 20;
-			num_qcnt = (conf2 & 0x00000FFF) >> 0;
-		}
-
-		num_lag_ram = (num_corl + num_pack - 1) / num_pack;
-		blk_size = ((num_pack * num_lags) + num_meta + num_qcnt) * 8;
-
-		priv->info[i].num_lag_ram = num_lag_ram;
-		priv->info[i].blk_size = blk_size;
-		priv->bufsize += num_lag_ram * blk_size;
-
-		dev_dbg(priv->dev, "FPGA %d NUM_CORL: %d\n", i, num_corl);
-		dev_dbg(priv->dev, "FPGA %d NUM_PACK: %d\n", i, num_pack);
-		dev_dbg(priv->dev, "FPGA %d NUM_LAGS: %d\n", i, num_lags);
-		dev_dbg(priv->dev, "FPGA %d NUM_META: %d\n", i, num_meta);
-		dev_dbg(priv->dev, "FPGA %d NUM_QCNT: %d\n", i, num_qcnt);
-		dev_dbg(priv->dev, "FPGA %d BLK_SIZE: %d\n", i, blk_size);
-	}
-
-	dev_dbg(priv->dev, "TOTAL BUFFER SIZE: %zu bytes\n", priv->bufsize);
-	return 0;
-}
-
-/*
- * Interrupt Handling
- */
-
-/**
- * data_disable_interrupts() - stop the device from generating interrupts
- * @priv: the driver's private data structure
- *
- * Hide interrupts by switching to GPIO interrupt source
- *
- * LOCKING: must hold dev->lock
- */
-static void data_disable_interrupts(struct fpga_device *priv)
-{
-	/* hide the interrupt by switching the IRQ driver to GPIO */
-	iowrite32be(0x2F, priv->regs + SYS_IRQ_SOURCE_CTL);
-}
-
-/**
- * data_enable_interrupts() - allow the device to generate interrupts
- * @priv: the driver's private data structure
- *
- * Unhide interrupts by switching to the FPGA interrupt source. At the
- * same time, clear the DATA-FPGA status registers.
- *
- * LOCKING: must hold dev->lock
- */
-static void data_enable_interrupts(struct fpga_device *priv)
-{
-	/* clear the actual FPGA corl_done interrupt */
-	fpga_write_reg(priv, 0, MMAP_REG_STATUS, 0x0);
-	fpga_write_reg(priv, 1, MMAP_REG_STATUS, 0x0);
-	fpga_write_reg(priv, 2, MMAP_REG_STATUS, 0x0);
-	fpga_write_reg(priv, 3, MMAP_REG_STATUS, 0x0);
-
-	/* flush the writes */
-	fpga_read_reg(priv, 0, MMAP_REG_STATUS);
-	fpga_read_reg(priv, 1, MMAP_REG_STATUS);
-	fpga_read_reg(priv, 2, MMAP_REG_STATUS);
-	fpga_read_reg(priv, 3, MMAP_REG_STATUS);
-
-	/* switch back to the external interrupt source */
-	iowrite32be(0x3F, priv->regs + SYS_IRQ_SOURCE_CTL);
-}
-
-/**
- * data_dma_cb() - DMAEngine callback for DMA completion
- * @data: the driver's private data structure
- *
- * Complete a DMA transfer from the DATA-FPGA's
- *
- * This is called via the DMA callback mechanism, and will handle moving the
- * completed DMA transaction to the used list, and then wake any processes
- * waiting for new data
- *
- * CONTEXT: any, softirq expected
- */
-static void data_dma_cb(void *data)
-{
-	struct fpga_device *priv = data;
-	unsigned long flags;
-
-	spin_lock_irqsave(&priv->lock, flags);
-
-	/* If there is no inflight buffer, we've got a bug */
-	BUG_ON(priv->inflight == NULL);
-
-	/* Move the inflight buffer onto the used list */
-	list_move_tail(&priv->inflight->entry, &priv->used);
-	priv->inflight = NULL;
-
-	/*
-	 * If data dumping is still enabled, then clear the FPGA
-	 * status registers and re-enable FPGA interrupts
-	 */
-	if (priv->enabled)
-		data_enable_interrupts(priv);
-
-	spin_unlock_irqrestore(&priv->lock, flags);
-
-	/*
-	 * We've changed both the inflight and used lists, so we need
-	 * to wake up any processes that are blocking for those events
-	 */
-	wake_up(&priv->wait);
-}
-
-/**
- * data_submit_dma() - prepare and submit the required DMA to fill a buffer
- * @priv: the driver's private data structure
- * @buf: the data buffer
- *
- * Prepare and submit the necessary DMA transactions to fill a correlation
- * data buffer.
- *
- * LOCKING: must hold dev->lock
- * CONTEXT: hardirq only
- *
- * Returns 0 on success, -ERRNO otherwise
- */
-static int data_submit_dma(struct fpga_device *priv, struct data_buf *buf)
-{
-	struct scatterlist *dst_sg, *src_sg;
-	unsigned int dst_nents, src_nents;
-	struct dma_chan *chan = priv->chan;
-	struct dma_async_tx_descriptor *tx;
-	dma_cookie_t cookie;
-	dma_addr_t dst, src;
-	unsigned long dma_flags = 0;
-
-	dst_sg = buf->sglist;
-	dst_nents = buf->sglen;
-
-	src_sg = priv->corl_table.sgl;
-	src_nents = priv->corl_nents;
-
-	/*
-	 * All buffers passed to this function should be ready and mapped
-	 * for DMA already. Therefore, we don't need to do anything except
-	 * submit it to the Freescale DMA Engine for processing
-	 */
-
-	/* setup the scatterlist to scatterlist transfer */
-	tx = chan->device->device_prep_dma_sg(chan,
-					      dst_sg, dst_nents,
-					      src_sg, src_nents,
-					      0);
-	if (!tx) {
-		dev_err(priv->dev, "unable to prep scatterlist DMA\n");
-		return -ENOMEM;
-	}
-
-	/* submit the transaction to the DMA controller */
-	cookie = tx->tx_submit(tx);
-	if (dma_submit_error(cookie)) {
-		dev_err(priv->dev, "unable to submit scatterlist DMA\n");
-		return -ENOMEM;
-	}
-
-	/* Prepare the re-read of the SYS-FPGA block */
-	dst = sg_dma_address(dst_sg) + (NUM_FPGA * REG_BLOCK_SIZE);
-	src = SYS_FPGA_BLOCK;
-	tx = chan->device->device_prep_dma_memcpy(chan, dst, src,
-						  REG_BLOCK_SIZE,
-						  dma_flags);
-	if (!tx) {
-		dev_err(priv->dev, "unable to prep SYS-FPGA DMA\n");
-		return -ENOMEM;
-	}
-
-	/* Setup the callback */
-	tx->callback = data_dma_cb;
-	tx->callback_param = priv;
-
-	/* submit the transaction to the DMA controller */
-	cookie = tx->tx_submit(tx);
-	if (dma_submit_error(cookie)) {
-		dev_err(priv->dev, "unable to submit SYS-FPGA DMA\n");
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-#define CORL_DONE	0x1
-#define CORL_ERR	0x2
-
-static irqreturn_t data_irq(int irq, void *dev_id)
-{
-	struct fpga_device *priv = dev_id;
-	bool submitted = false;
-	struct data_buf *buf;
-	u32 status;
-	int i;
-
-	/* detect spurious interrupts via FPGA status */
-	for (i = 0; i < 4; i++) {
-		status = fpga_read_reg(priv, i, MMAP_REG_STATUS);
-		if (!(status & (CORL_DONE | CORL_ERR))) {
-			dev_err(priv->dev, "spurious irq detected (FPGA)\n");
-			return IRQ_NONE;
-		}
-	}
-
-	/* detect spurious interrupts via raw IRQ pin readback */
-	status = ioread32be(priv->regs + SYS_IRQ_INPUT_DATA);
-	if (status & IRQ_CORL_DONE) {
-		dev_err(priv->dev, "spurious irq detected (IRQ)\n");
-		return IRQ_NONE;
-	}
-
-	spin_lock(&priv->lock);
-
-	/*
-	 * This is an error case that should never happen.
-	 *
-	 * If this driver has a bug and manages to re-enable interrupts while
-	 * a DMA is in progress, then we will hit this statement and should
-	 * start paying attention immediately.
-	 */
-	BUG_ON(priv->inflight != NULL);
-
-	/* hide the interrupt by switching the IRQ driver to GPIO */
-	data_disable_interrupts(priv);
-
-	/* If there are no free buffers, drop this data */
-	if (list_empty(&priv->free)) {
-		priv->num_dropped++;
-		goto out;
-	}
-
-	buf = list_first_entry(&priv->free, struct data_buf, entry);
-	list_del_init(&buf->entry);
-	BUG_ON(buf->size != priv->bufsize);
-
-	/* Submit a DMA transfer to get the correlation data */
-	if (data_submit_dma(priv, buf)) {
-		dev_err(priv->dev, "Unable to setup DMA transfer\n");
-		list_move_tail(&buf->entry, &priv->free);
-		goto out;
-	}
-
-	/* Save the buffer for the DMA callback */
-	priv->inflight = buf;
-	submitted = true;
-
-	/* Start the DMA Engine */
-	dma_async_issue_pending(priv->chan);
-
-out:
-	/* If no DMA was submitted, re-enable interrupts */
-	if (!submitted)
-		data_enable_interrupts(priv);
-
-	spin_unlock(&priv->lock);
-	return IRQ_HANDLED;
-}
-
-/*
- * Realtime Device Enable Helpers
- */
-
-/**
- * data_device_enable() - enable the device for buffered dumping
- * @priv: the driver's private data structure
- *
- * Enable the device for buffered dumping. Allocates buffers and hooks up
- * the interrupt handler. When this finishes, data will come pouring in.
- *
- * LOCKING: must hold dev->mutex
- * CONTEXT: user context only
- *
- * Returns 0 on success, -ERRNO otherwise
- */
-static int data_device_enable(struct fpga_device *priv)
-{
-	bool enabled;
-	u32 val;
-	int ret;
-
-	/* multiple enables are safe: they do nothing */
-	spin_lock_irq(&priv->lock);
-	enabled = priv->enabled;
-	spin_unlock_irq(&priv->lock);
-	if (enabled)
-		return 0;
-
-	/* check that the FPGAs are programmed */
-	val = ioread32be(priv->regs + SYS_FPGA_CONFIG_STATUS);
-	if (!(val & (1 << 18))) {
-		dev_err(priv->dev, "DATA-FPGAs are not enabled\n");
-		return -ENODATA;
-	}
-
-	/* read the FPGAs to calculate the buffer size */
-	ret = data_calculate_bufsize(priv);
-	if (ret) {
-		dev_err(priv->dev, "unable to calculate buffer size\n");
-		goto out_error;
-	}
-
-	/* allocate the correlation data buffers */
-	ret = data_alloc_buffers(priv);
-	if (ret) {
-		dev_err(priv->dev, "unable to allocate buffers\n");
-		goto out_error;
-	}
-
-	/* setup the source scatterlist for dumping correlation data */
-	ret = data_setup_corl_table(priv);
-	if (ret) {
-		dev_err(priv->dev, "unable to setup correlation DMA table\n");
-		goto out_error;
-	}
-
-	/* prevent the FPGAs from generating interrupts */
-	data_disable_interrupts(priv);
-
-	/* hookup the irq handler */
-	ret = request_irq(priv->irq, data_irq, IRQF_SHARED, drv_name, priv);
-	if (ret) {
-		dev_err(priv->dev, "unable to request IRQ handler\n");
-		goto out_error;
-	}
-
-	/* allow the DMA callback to re-enable FPGA interrupts */
-	spin_lock_irq(&priv->lock);
-	priv->enabled = true;
-	spin_unlock_irq(&priv->lock);
-
-	/* allow the FPGAs to generate interrupts */
-	data_enable_interrupts(priv);
-	return 0;
-
-out_error:
-	sg_free_table(&priv->corl_table);
-	priv->corl_nents = 0;
-
-	data_free_buffers(priv);
-	return ret;
-}
-
-/**
- * data_device_disable() - disable the device for buffered dumping
- * @priv: the driver's private data structure
- *
- * Disable the device for buffered dumping. Stops new DMA transactions from
- * being generated, waits for all outstanding DMA to complete, and then frees
- * all buffers.
- *
- * LOCKING: must hold dev->mutex
- * CONTEXT: user only
- *
- * Returns 0 on success, -ERRNO otherwise
- */
-static int data_device_disable(struct fpga_device *priv)
-{
-	spin_lock_irq(&priv->lock);
-
-	/* allow multiple disable */
-	if (!priv->enabled) {
-		spin_unlock_irq(&priv->lock);
-		return 0;
-	}
-
-	/*
-	 * Mark the device disabled
-	 *
-	 * This stops DMA callbacks from re-enabling interrupts
-	 */
-	priv->enabled = false;
-
-	/* prevent the FPGAs from generating interrupts */
-	data_disable_interrupts(priv);
-
-	/* wait until all ongoing DMA has finished */
-	while (priv->inflight != NULL) {
-		spin_unlock_irq(&priv->lock);
-		wait_event(priv->wait, priv->inflight == NULL);
-		spin_lock_irq(&priv->lock);
-	}
-
-	spin_unlock_irq(&priv->lock);
-
-	/* unhook the irq handler */
-	free_irq(priv->irq, priv);
-
-	/* free the correlation table */
-	sg_free_table(&priv->corl_table);
-	priv->corl_nents = 0;
-
-	/* free all buffers: the free and used lists are not being changed */
-	data_free_buffers(priv);
-	return 0;
-}
-
-/*
- * DEBUGFS Interface
- */
-#ifdef CONFIG_DEBUG_FS
-
-/*
- * Count the number of entries in the given list
- */
-static unsigned int list_num_entries(struct list_head *list)
-{
-	struct list_head *entry;
-	unsigned int ret = 0;
-
-	list_for_each(entry, list)
-		ret++;
-
-	return ret;
-}
-
-static int data_debug_show(struct seq_file *f, void *offset)
-{
-	struct fpga_device *priv = f->private;
-
-	spin_lock_irq(&priv->lock);
-
-	seq_printf(f, "enabled: %d\n", priv->enabled);
-	seq_printf(f, "bufsize: %d\n", priv->bufsize);
-	seq_printf(f, "num_buffers: %d\n", priv->num_buffers);
-	seq_printf(f, "num_free: %d\n", list_num_entries(&priv->free));
-	seq_printf(f, "inflight: %d\n", priv->inflight != NULL);
-	seq_printf(f, "num_used: %d\n", list_num_entries(&priv->used));
-	seq_printf(f, "num_dropped: %d\n", priv->num_dropped);
-
-	spin_unlock_irq(&priv->lock);
-	return 0;
-}
-
-static int data_debug_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, data_debug_show, inode->i_private);
-}
-
-static const struct file_operations data_debug_fops = {
-	.owner		= THIS_MODULE,
-	.open		= data_debug_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-
-static int data_debugfs_init(struct fpga_device *priv)
-{
-	priv->dbg_entry = debugfs_create_file(drv_name, S_IRUGO, NULL, priv,
-					      &data_debug_fops);
-	return PTR_ERR_OR_ZERO(priv->dbg_entry);
-}
-
-static void data_debugfs_exit(struct fpga_device *priv)
-{
-	debugfs_remove(priv->dbg_entry);
-}
-
-#else
-
-static inline int data_debugfs_init(struct fpga_device *priv)
-{
-	return 0;
-}
-
-static inline void data_debugfs_exit(struct fpga_device *priv)
-{
-}
-
-#endif	/* CONFIG_DEBUG_FS */
-
-/*
- * SYSFS Attributes
- */
-
-static ssize_t data_en_show(struct device *dev, struct device_attribute *attr,
-			    char *buf)
-{
-	struct fpga_device *priv = dev_get_drvdata(dev);
-	int ret;
-
-	spin_lock_irq(&priv->lock);
-	ret = snprintf(buf, PAGE_SIZE, "%u\n", priv->enabled);
-	spin_unlock_irq(&priv->lock);
-
-	return ret;
-}
-
-static ssize_t data_en_set(struct device *dev, struct device_attribute *attr,
-			   const char *buf, size_t count)
-{
-	struct fpga_device *priv = dev_get_drvdata(dev);
-	unsigned long enable;
-	int ret;
-
-	ret = kstrtoul(buf, 0, &enable);
-	if (ret) {
-		dev_err(priv->dev, "unable to parse enable input\n");
-		return ret;
-	}
-
-	/* protect against concurrent enable/disable */
-	ret = mutex_lock_interruptible(&priv->mutex);
-	if (ret)
-		return ret;
-
-	if (enable)
-		ret = data_device_enable(priv);
-	else
-		ret = data_device_disable(priv);
-
-	if (ret) {
-		dev_err(priv->dev, "device %s failed\n",
-			enable ? "enable" : "disable");
-		count = ret;
-		goto out_unlock;
-	}
-
-out_unlock:
-	mutex_unlock(&priv->mutex);
-	return count;
-}
-
-static DEVICE_ATTR(enable, S_IWUSR | S_IRUGO, data_en_show, data_en_set);
-
-static struct attribute *data_sysfs_attrs[] = {
-	&dev_attr_enable.attr,
-	NULL,
-};
-
-static const struct attribute_group rt_sysfs_attr_group = {
-	.attrs = data_sysfs_attrs,
-};
-
-/*
- * FPGA Realtime Data Character Device
- */
-
-static int data_open(struct inode *inode, struct file *filp)
-{
-	/*
-	 * The miscdevice layer puts our struct miscdevice into the
-	 * filp->private_data field. We use this to find our private
-	 * data and then overwrite it with our own private structure.
-	 */
-	struct fpga_device *priv = container_of(filp->private_data,
-						struct fpga_device, miscdev);
-	struct fpga_reader *reader;
-	int ret;
-
-	/* allocate private data */
-	reader = kzalloc(sizeof(*reader), GFP_KERNEL);
-	if (!reader)
-		return -ENOMEM;
-
-	reader->priv = priv;
-	reader->buf = NULL;
-
-	filp->private_data = reader;
-	ret = nonseekable_open(inode, filp);
-	if (ret) {
-		dev_err(priv->dev, "nonseekable-open failed\n");
-		kfree(reader);
-		return ret;
-	}
-
-	/*
-	 * success, increase the reference count of the private data structure
-	 * so that it doesn't disappear if the device is unbound
-	 */
-	kref_get(&priv->ref);
-	return 0;
-}
-
-static int data_release(struct inode *inode, struct file *filp)
-{
-	struct fpga_reader *reader = filp->private_data;
-	struct fpga_device *priv = reader->priv;
-
-	/* free the per-reader structure */
-	data_free_buffer(reader->buf);
-	kfree(reader);
-	filp->private_data = NULL;
-
-	/* decrement our reference count to the private data */
-	kref_put(&priv->ref, fpga_device_release);
-	return 0;
-}
-
-static ssize_t data_read(struct file *filp, char __user *ubuf, size_t count,
-			 loff_t *f_pos)
-{
-	struct fpga_reader *reader = filp->private_data;
-	struct fpga_device *priv = reader->priv;
-	struct list_head *used = &priv->used;
-	bool drop_buffer = false;
-	struct data_buf *dbuf;
-	size_t avail;
-	void *data;
-	int ret;
-
-	/* check if we already have a partial buffer */
-	if (reader->buf) {
-		dbuf = reader->buf;
-		goto have_buffer;
-	}
-
-	spin_lock_irq(&priv->lock);
-
-	/* Block until there is at least one buffer on the used list */
-	while (list_empty(used)) {
-		spin_unlock_irq(&priv->lock);
-
-		if (filp->f_flags & O_NONBLOCK)
-			return -EAGAIN;
-
-		ret = wait_event_interruptible(priv->wait, !list_empty(used));
-		if (ret)
-			return ret;
-
-		spin_lock_irq(&priv->lock);
-	}
-
-	/* Grab the first buffer off of the used list */
-	dbuf = list_first_entry(used, struct data_buf, entry);
-	list_del_init(&dbuf->entry);
-
-	spin_unlock_irq(&priv->lock);
-
-	/* Buffers are always mapped: unmap it */
-	carma_dma_unmap(priv->dev, dbuf);
-
-	/* save the buffer for later */
-	reader->buf = dbuf;
-	reader->buf_start = 0;
-
-have_buffer:
-	/* Get the number of bytes available */
-	avail = dbuf->size - reader->buf_start;
-	data = dbuf->vaddr + reader->buf_start;
-
-	/* Get the number of bytes we can transfer */
-	count = min(count, avail);
-
-	/* Copy the data to the userspace buffer */
-	if (copy_to_user(ubuf, data, count))
-		return -EFAULT;
-
-	/* Update the amount of available space */
-	avail -= count;
-
-	/*
-	 * If there is still some data available, save the buffer for the
-	 * next userspace call to read() and return
-	 */
-	if (avail > 0) {
-		reader->buf_start += count;
-		reader->buf = dbuf;
-		return count;
-	}
-
-	/*
-	 * Get the buffer ready to be reused for DMA
-	 *
-	 * If it fails, we pretend that the read never happed and return
-	 * -EFAULT to userspace. The read will be retried.
-	 */
-	ret = carma_dma_map(priv->dev, dbuf);
-	if (ret) {
-		dev_err(priv->dev, "unable to remap buffer for DMA\n");
-		return -EFAULT;
-	}
-
-	/* Lock against concurrent enable/disable */
-	spin_lock_irq(&priv->lock);
-
-	/* the reader is finished with this buffer */
-	reader->buf = NULL;
-
-	/*
-	 * One of two things has happened, the device is disabled, or the
-	 * device has been reconfigured underneath us. In either case, we
-	 * should just throw away the buffer.
-	 *
-	 * Lockdep complains if this is done under the spinlock, so we
-	 * handle it during the unlock path.
-	 */
-	if (!priv->enabled || dbuf->size != priv->bufsize) {
-		drop_buffer = true;
-		goto out_unlock;
-	}
-
-	/* The buffer is safe to reuse, so add it back to the free list */
-	list_add_tail(&dbuf->entry, &priv->free);
-
-out_unlock:
-	spin_unlock_irq(&priv->lock);
-
-	if (drop_buffer) {
-		carma_dma_unmap(priv->dev, dbuf);
-		data_free_buffer(dbuf);
-	}
-
-	return count;
-}
-
-static unsigned int data_poll(struct file *filp, struct poll_table_struct *tbl)
-{
-	struct fpga_reader *reader = filp->private_data;
-	struct fpga_device *priv = reader->priv;
-	unsigned int mask = 0;
-
-	poll_wait(filp, &priv->wait, tbl);
-
-	if (!list_empty(&priv->used))
-		mask |= POLLIN | POLLRDNORM;
-
-	return mask;
-}
-
-static int data_mmap(struct file *filp, struct vm_area_struct *vma)
-{
-	struct fpga_reader *reader = filp->private_data;
-	struct fpga_device *priv = reader->priv;
-	unsigned long offset, vsize, psize, addr;
-
-	/* VMA properties */
-	offset = vma->vm_pgoff << PAGE_SHIFT;
-	vsize = vma->vm_end - vma->vm_start;
-	psize = priv->phys_size - offset;
-	addr = (priv->phys_addr + offset) >> PAGE_SHIFT;
-
-	/* Check against the FPGA region's physical memory size */
-	if (vsize > psize) {
-		dev_err(priv->dev, "requested mmap mapping too large\n");
-		return -EINVAL;
-	}
-
-	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-
-	return io_remap_pfn_range(vma, vma->vm_start, addr, vsize,
-				  vma->vm_page_prot);
-}
-
-static const struct file_operations data_fops = {
-	.owner		= THIS_MODULE,
-	.open		= data_open,
-	.release	= data_release,
-	.read		= data_read,
-	.poll		= data_poll,
-	.mmap		= data_mmap,
-	.llseek		= no_llseek,
-};
-
-/*
- * OpenFirmware Device Subsystem
- */
-
-static bool dma_filter(struct dma_chan *chan, void *data)
-{
-	/*
-	 * DMA Channel #0 is used for the FPGA Programmer, so ignore it
-	 *
-	 * This probably won't survive an unload/load cycle of the Freescale
-	 * DMAEngine driver, but that won't be a problem
-	 */
-	if (chan->chan_id == 0 && chan->device->dev_id == 0)
-		return false;
-
-	return true;
-}
-
-static int data_of_probe(struct platform_device *op)
-{
-	struct device_node *of_node = op->dev.of_node;
-	struct device *this_device;
-	struct fpga_device *priv;
-	struct resource res;
-	dma_cap_mask_t mask;
-	int ret;
-
-	/* Allocate private data */
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv) {
-		dev_err(&op->dev, "Unable to allocate device private data\n");
-		ret = -ENOMEM;
-		goto out_return;
-	}
-
-	platform_set_drvdata(op, priv);
-	priv->dev = &op->dev;
-	kref_init(&priv->ref);
-	mutex_init(&priv->mutex);
-
-	dev_set_drvdata(priv->dev, priv);
-	spin_lock_init(&priv->lock);
-	INIT_LIST_HEAD(&priv->free);
-	INIT_LIST_HEAD(&priv->used);
-	init_waitqueue_head(&priv->wait);
-
-	/* Setup the misc device */
-	priv->miscdev.minor = MISC_DYNAMIC_MINOR;
-	priv->miscdev.name = drv_name;
-	priv->miscdev.fops = &data_fops;
-
-	/* Get the physical address of the FPGA registers */
-	ret = of_address_to_resource(of_node, 0, &res);
-	if (ret) {
-		dev_err(&op->dev, "Unable to find FPGA physical address\n");
-		ret = -ENODEV;
-		goto out_free_priv;
-	}
-
-	priv->phys_addr = res.start;
-	priv->phys_size = resource_size(&res);
-
-	/* ioremap the registers for use */
-	priv->regs = of_iomap(of_node, 0);
-	if (!priv->regs) {
-		dev_err(&op->dev, "Unable to ioremap registers\n");
-		ret = -ENOMEM;
-		goto out_free_priv;
-	}
-
-	dma_cap_zero(mask);
-	dma_cap_set(DMA_MEMCPY, mask);
-	dma_cap_set(DMA_INTERRUPT, mask);
-	dma_cap_set(DMA_SLAVE, mask);
-	dma_cap_set(DMA_SG, mask);
-
-	/* Request a DMA channel */
-	priv->chan = dma_request_channel(mask, dma_filter, NULL);
-	if (!priv->chan) {
-		dev_err(&op->dev, "Unable to request DMA channel\n");
-		ret = -ENODEV;
-		goto out_unmap_regs;
-	}
-
-	/* Find the correct IRQ number */
-	priv->irq = irq_of_parse_and_map(of_node, 0);
-	if (priv->irq == NO_IRQ) {
-		dev_err(&op->dev, "Unable to find IRQ line\n");
-		ret = -ENODEV;
-		goto out_release_dma;
-	}
-
-	/* Drive the GPIO for FPGA IRQ high (no interrupt) */
-	iowrite32be(IRQ_CORL_DONE, priv->regs + SYS_IRQ_OUTPUT_DATA);
-
-	/* Register the miscdevice */
-	ret = misc_register(&priv->miscdev);
-	if (ret) {
-		dev_err(&op->dev, "Unable to register miscdevice\n");
-		goto out_irq_dispose_mapping;
-	}
-
-	/* Create the debugfs files */
-	ret = data_debugfs_init(priv);
-	if (ret) {
-		dev_err(&op->dev, "Unable to create debugfs files\n");
-		goto out_misc_deregister;
-	}
-
-	/* Create the sysfs files */
-	this_device = priv->miscdev.this_device;
-	dev_set_drvdata(this_device, priv);
-	ret = sysfs_create_group(&this_device->kobj, &rt_sysfs_attr_group);
-	if (ret) {
-		dev_err(&op->dev, "Unable to create sysfs files\n");
-		goto out_data_debugfs_exit;
-	}
-
-	dev_info(&op->dev, "CARMA FPGA Realtime Data Driver Loaded\n");
-	return 0;
-
-out_data_debugfs_exit:
-	data_debugfs_exit(priv);
-out_misc_deregister:
-	misc_deregister(&priv->miscdev);
-out_irq_dispose_mapping:
-	irq_dispose_mapping(priv->irq);
-out_release_dma:
-	dma_release_channel(priv->chan);
-out_unmap_regs:
-	iounmap(priv->regs);
-out_free_priv:
-	kref_put(&priv->ref, fpga_device_release);
-out_return:
-	return ret;
-}
-
-static int data_of_remove(struct platform_device *op)
-{
-	struct fpga_device *priv = platform_get_drvdata(op);
-	struct device *this_device = priv->miscdev.this_device;
-
-	/* remove all sysfs files, now the device cannot be re-enabled */
-	sysfs_remove_group(&this_device->kobj, &rt_sysfs_attr_group);
-
-	/* remove all debugfs files */
-	data_debugfs_exit(priv);
-
-	/* disable the device from generating data */
-	data_device_disable(priv);
-
-	/* remove the character device to stop new readers from appearing */
-	misc_deregister(&priv->miscdev);
-
-	/* cleanup everything not needed by readers */
-	irq_dispose_mapping(priv->irq);
-	dma_release_channel(priv->chan);
-	iounmap(priv->regs);
-
-	/* release our reference */
-	kref_put(&priv->ref, fpga_device_release);
-	return 0;
-}
-
-static const struct of_device_id data_of_match[] = {
-	{ .compatible = "carma,carma-fpga", },
-	{},
-};
-
-static struct platform_driver data_of_driver = {
-	.probe		= data_of_probe,
-	.remove		= data_of_remove,
-	.driver		= {
-		.name		= drv_name,
-		.of_match_table	= data_of_match,
-	},
-};
-
-module_platform_driver(data_of_driver);
-
-MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
-MODULE_DESCRIPTION("CARMA DATA-FPGA Access Driver");
-MODULE_LICENSE("GPL");