vlynq: remove bus driver

There are no users with a vlynq_driver in the Kernel tree. Also, only
the AR7 platform ever initialized a VLYNQ bus, but AR7 is going to be
removed from the Kernel. OpenWRT had some out-of-tree drivers which they
probably intended to upport, but AR7 devices are even there not
supported anymore because they are "stuck with Kernel
3.18" [1]. This code can go.

[1] https://openwrt.org/docs/techref/targets/ar7

Signed-off-by: Wolfram Sang <[e-mail]>
Acked-by: Greg Kroah-Hartman <[e-mail]>
Acked-by: Florian Fainelli <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

MAINTAINERS

···
 T:	git git://linuxtv.org/media_tree.git
 F:	drivers/media/test-drivers/vivid/*
 
-VLYNQ BUS
-M:	Florian Fainelli <[e-mail]>
-L:	[e-mail] (subscribers-only)
-S:	Maintained
-F:	drivers/vlynq/vlynq.c
-F:	include/linux/vlynq.h
-
 VM SOCKETS (AF_VSOCK)
 M:	Stefano Garzarella <[e-mail]>
 L:	[e-mail]

drivers/Kconfig

···
 
 source "drivers/vfio/Kconfig"
 
-source "drivers/vlynq/Kconfig"
-
 source "drivers/virt/Kconfig"
 
 source "drivers/virtio/Kconfig"

drivers/Makefile

···
 obj-$(CONFIG_VHOST_RING)	+= vhost/
 obj-$(CONFIG_VHOST_IOTLB)	+= vhost/
 obj-$(CONFIG_VHOST)		+= vhost/
-obj-$(CONFIG_VLYNQ)		+= vlynq/
 obj-$(CONFIG_GREYBUS)		+= greybus/
 obj-$(CONFIG_COMEDI)		+= comedi/
 obj-$(CONFIG_STAGING)		+= staging/

drivers/vlynq/Kconfig

···
-# SPDX-License-Identifier: GPL-2.0-only
-menu "TI VLYNQ"
-	depends on AR7
-
-config VLYNQ
-	bool "TI VLYNQ bus support"
-	help
-	  Support for Texas Instruments(R) VLYNQ bus.
-	  The VLYNQ bus is a high-speed, serial and packetized
-	  data bus which allows external peripherals of a SoC
-	  to appear into the system's main memory.
-
-	  If unsure, say N
-
-config VLYNQ_DEBUG
-	bool "VLYNQ bus debug"
-	depends on VLYNQ && DEBUG_KERNEL
-	help
-	  Turn on VLYNQ bus debugging.
-
-endmenu

drivers/vlynq/Makefile

···
-# SPDX-License-Identifier: GPL-2.0-only
-#
-# Makefile for kernel vlynq drivers
-#
-
-obj-$(CONFIG_VLYNQ) += vlynq.o

drivers/vlynq/vlynq.c

···
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2006, 2007 Eugene Konev <[e-mail]>
- *
- * Parts of the VLYNQ specification can be found here:
- * http://www.ti.com/litv/pdf/sprue36a
- */
-
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/device.h>
-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/platform_device.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/io.h>
-#include <linux/slab.h>
-#include <linux/irq.h>
-
-#include <linux/vlynq.h>
-
-#define VLYNQ_CTRL_PM_ENABLE		0x80000000
-#define VLYNQ_CTRL_CLOCK_INT		0x00008000
-#define VLYNQ_CTRL_CLOCK_DIV(x)		(((x) & 7) << 16)
-#define VLYNQ_CTRL_INT_LOCAL		0x00004000
-#define VLYNQ_CTRL_INT_ENABLE		0x00002000
-#define VLYNQ_CTRL_INT_VECTOR(x)	(((x) & 0x1f) << 8)
-#define VLYNQ_CTRL_INT2CFG		0x00000080
-#define VLYNQ_CTRL_RESET		0x00000001
-
-#define VLYNQ_CTRL_CLOCK_MASK          (0x7 << 16)
-
-#define VLYNQ_INT_OFFSET		0x00000014
-#define VLYNQ_REMOTE_OFFSET		0x00000080
-
-#define VLYNQ_STATUS_LINK		0x00000001
-#define VLYNQ_STATUS_LERROR		0x00000080
-#define VLYNQ_STATUS_RERROR		0x00000100
-
-#define VINT_ENABLE			0x00000100
-#define VINT_TYPE_EDGE			0x00000080
-#define VINT_LEVEL_LOW			0x00000040
-#define VINT_VECTOR(x)			((x) & 0x1f)
-#define VINT_OFFSET(irq)		(8 * ((irq) % 4))
-
-#define VLYNQ_AUTONEGO_V2		0x00010000
-
-struct vlynq_regs {
-	u32 revision;
-	u32 control;
-	u32 status;
-	u32 int_prio;
-	u32 int_status;
-	u32 int_pending;
-	u32 int_ptr;
-	u32 tx_offset;
-	struct vlynq_mapping rx_mapping[4];
-	u32 chip;
-	u32 autonego;
-	u32 unused[6];
-	u32 int_device[8];
-};
-
-#ifdef CONFIG_VLYNQ_DEBUG
-static void vlynq_dump_regs(struct vlynq_device *dev)
-{
-	int i;
-
-	printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n",
-			dev->local, dev->remote);
-	for (i = 0; i < 32; i++) {
-		printk(KERN_DEBUG "VLYNQ: local %d: %08x\n",
-			i + 1, ((u32 *)dev->local)[i]);
-		printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n",
-			i + 1, ((u32 *)dev->remote)[i]);
-	}
-}
-
-static void vlynq_dump_mem(u32 *base, int count)
-{
-	int i;
-
-	for (i = 0; i < (count + 3) / 4; i++) {
-		if (i % 4 == 0)
-			printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
-		printk(KERN_DEBUG " 0x%08x", *(base + i));
-	}
-	printk(KERN_DEBUG "\n");
-}
-#endif
-
-/* Check the VLYNQ link status with a given device */
-static int vlynq_linked(struct vlynq_device *dev)
-{
-	int i;
-
-	for (i = 0; i < 100; i++)
-		if (readl(&dev->local->status) & VLYNQ_STATUS_LINK)
-			return 1;
-		else
-			cpu_relax();
-
-	return 0;
-}
-
-static void vlynq_reset(struct vlynq_device *dev)
-{
-	writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET,
-			&dev->local->control);
-
-	/* Wait for the devices to finish resetting */
-	msleep(5);
-
-	/* Remove reset bit */
-	writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET,
-			&dev->local->control);
-
-	/* Give some time for the devices to settle */
-	msleep(5);
-}
-
-static void vlynq_irq_unmask(struct irq_data *d)
-{
-	struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
-	int virq;
-	u32 val;
-
-	BUG_ON(!dev);
-	virq = d->irq - dev->irq_start;
-	val = readl(&dev->remote->int_device[virq >> 2]);
-	val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
-	writel(val, &dev->remote->int_device[virq >> 2]);
-}
-
-static void vlynq_irq_mask(struct irq_data *d)
-{
-	struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
-	int virq;
-	u32 val;
-
-	BUG_ON(!dev);
-	virq = d->irq - dev->irq_start;
-	val = readl(&dev->remote->int_device[virq >> 2]);
-	val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
-	writel(val, &dev->remote->int_device[virq >> 2]);
-}
-
-static int vlynq_irq_type(struct irq_data *d, unsigned int flow_type)
-{
-	struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
-	int virq;
-	u32 val;
-
-	BUG_ON(!dev);
-	virq = d->irq - dev->irq_start;
-	val = readl(&dev->remote->int_device[virq >> 2]);
-	switch (flow_type & IRQ_TYPE_SENSE_MASK) {
-	case IRQ_TYPE_EDGE_RISING:
-	case IRQ_TYPE_EDGE_FALLING:
-	case IRQ_TYPE_EDGE_BOTH:
-		val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
-		val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
-		break;
-	case IRQ_TYPE_LEVEL_HIGH:
-		val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
-		val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
-		break;
-	case IRQ_TYPE_LEVEL_LOW:
-		val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
-		val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
-		break;
-	default:
-		return -EINVAL;
-	}
-	writel(val, &dev->remote->int_device[virq >> 2]);
-	return 0;
-}
-
-static void vlynq_local_ack(struct irq_data *d)
-{
-	struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
-	u32 status = readl(&dev->local->status);
-
-	pr_debug("%s: local status: 0x%08x\n",
-		       dev_name(&dev->dev), status);
-	writel(status, &dev->local->status);
-}
-
-static void vlynq_remote_ack(struct irq_data *d)
-{
-	struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
-	u32 status = readl(&dev->remote->status);
-
-	pr_debug("%s: remote status: 0x%08x\n",
-		       dev_name(&dev->dev), status);
-	writel(status, &dev->remote->status);
-}
-
-static irqreturn_t vlynq_irq(int irq, void *dev_id)
-{
-	struct vlynq_device *dev = dev_id;
-	u32 status;
-	int virq = 0;
-
-	status = readl(&dev->local->int_status);
-	writel(status, &dev->local->int_status);
-
-	if (unlikely(!status))
-		spurious_interrupt();
-
-	while (status) {
-		if (status & 1)
-			do_IRQ(dev->irq_start + virq);
-		status >>= 1;
-		virq++;
-	}
-
-	return IRQ_HANDLED;
-}
-
-static struct irq_chip vlynq_irq_chip = {
-	.name = "vlynq",
-	.irq_unmask = vlynq_irq_unmask,
-	.irq_mask = vlynq_irq_mask,
-	.irq_set_type = vlynq_irq_type,
-};
-
-static struct irq_chip vlynq_local_chip = {
-	.name = "vlynq local error",
-	.irq_unmask = vlynq_irq_unmask,
-	.irq_mask = vlynq_irq_mask,
-	.irq_ack = vlynq_local_ack,
-};
-
-static struct irq_chip vlynq_remote_chip = {
-	.name = "vlynq local error",
-	.irq_unmask = vlynq_irq_unmask,
-	.irq_mask = vlynq_irq_mask,
-	.irq_ack = vlynq_remote_ack,
-};
-
-static int vlynq_setup_irq(struct vlynq_device *dev)
-{
-	u32 val;
-	int i, virq;
-
-	if (dev->local_irq == dev->remote_irq) {
-		printk(KERN_ERR
-		       "%s: local vlynq irq should be different from remote\n",
-		       dev_name(&dev->dev));
-		return -EINVAL;
-	}
-
-	/* Clear local and remote error bits */
-	writel(readl(&dev->local->status), &dev->local->status);
-	writel(readl(&dev->remote->status), &dev->remote->status);
-
-	/* Now setup interrupts */
-	val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
-	val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
-		VLYNQ_CTRL_INT2CFG;
-	val |= readl(&dev->local->control);
-	writel(VLYNQ_INT_OFFSET, &dev->local->int_ptr);
-	writel(val, &dev->local->control);
-
-	val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
-	val |= VLYNQ_CTRL_INT_ENABLE;
-	val |= readl(&dev->remote->control);
-	writel(VLYNQ_INT_OFFSET, &dev->remote->int_ptr);
-	writel(val, &dev->remote->int_ptr);
-	writel(val, &dev->remote->control);
-
-	for (i = dev->irq_start; i <= dev->irq_end; i++) {
-		virq = i - dev->irq_start;
-		if (virq == dev->local_irq) {
-			irq_set_chip_and_handler(i, &vlynq_local_chip,
-						 handle_level_irq);
-			irq_set_chip_data(i, dev);
-		} else if (virq == dev->remote_irq) {
-			irq_set_chip_and_handler(i, &vlynq_remote_chip,
-						 handle_level_irq);
-			irq_set_chip_data(i, dev);
-		} else {
-			irq_set_chip_and_handler(i, &vlynq_irq_chip,
-						 handle_simple_irq);
-			irq_set_chip_data(i, dev);
-			writel(0, &dev->remote->int_device[virq >> 2]);
-		}
-	}
-
-	if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
-		printk(KERN_ERR "%s: request_irq failed\n",
-					dev_name(&dev->dev));
-		return -EAGAIN;
-	}
-
-	return 0;
-}
-
-static void vlynq_device_release(struct device *dev)
-{
-	struct vlynq_device *vdev = to_vlynq_device(dev);
-	kfree(vdev);
-}
-
-static int vlynq_device_match(struct device *dev,
-			      struct device_driver *drv)
-{
-	struct vlynq_device *vdev = to_vlynq_device(dev);
-	struct vlynq_driver *vdrv = to_vlynq_driver(drv);
-	struct vlynq_device_id *ids = vdrv->id_table;
-
-	while (ids->id) {
-		if (ids->id == vdev->dev_id) {
-			vdev->divisor = ids->divisor;
-			vlynq_set_drvdata(vdev, ids);
-			printk(KERN_INFO "Driver found for VLYNQ "
-				"device: %08x\n", vdev->dev_id);
-			return 1;
-		}
-		printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver"
-			" for VLYNQ device: %08x\n", ids->id, vdev->dev_id);
-		ids++;
-	}
-	return 0;
-}
-
-static int vlynq_device_probe(struct device *dev)
-{
-	struct vlynq_device *vdev = to_vlynq_device(dev);
-	struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
-	struct vlynq_device_id *id = vlynq_get_drvdata(vdev);
-	int result = -ENODEV;
-
-	if (drv->probe)
-		result = drv->probe(vdev, id);
-	if (result)
-		put_device(dev);
-	return result;
-}
-
-static void vlynq_device_remove(struct device *dev)
-{
-	struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
-
-	if (drv->remove)
-		drv->remove(to_vlynq_device(dev));
-}
-
-int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
-{
-	driver->driver.name = driver->name;
-	driver->driver.bus = &vlynq_bus_type;
-	return driver_register(&driver->driver);
-}
-EXPORT_SYMBOL(__vlynq_register_driver);
-
-void vlynq_unregister_driver(struct vlynq_driver *driver)
-{
-	driver_unregister(&driver->driver);
-}
-EXPORT_SYMBOL(vlynq_unregister_driver);
-
-/*
- * A VLYNQ remote device can clock the VLYNQ bus master
- * using a dedicated clock line. In that case, both the
- * remove device and the bus master should have the same
- * serial clock dividers configured. Iterate through the
- * 8 possible dividers until we actually link with the
- * device.
- */
-static int __vlynq_try_remote(struct vlynq_device *dev)
-{
-	int i;
-
-	vlynq_reset(dev);
-	for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
-			i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
-		dev->dev_id ? i++ : i--) {
-
-		if (!vlynq_linked(dev))
-			break;
-
-		writel((readl(&dev->remote->control) &
-				~VLYNQ_CTRL_CLOCK_MASK) |
-				VLYNQ_CTRL_CLOCK_INT |
-				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
-				&dev->remote->control);
-		writel((readl(&dev->local->control)
-				& ~(VLYNQ_CTRL_CLOCK_INT |
-				VLYNQ_CTRL_CLOCK_MASK)) |
-				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
-				&dev->local->control);
-
-		if (vlynq_linked(dev)) {
-			printk(KERN_DEBUG
-				"%s: using remote clock divisor %d\n",
-				dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
-			dev->divisor = i;
-			return 0;
-		} else {
-			vlynq_reset(dev);
-		}
-	}
-
-	return -ENODEV;
-}
-
-/*
- * A VLYNQ remote device can be clocked by the VLYNQ bus
- * master using a dedicated clock line. In that case, only
- * the bus master configures the serial clock divider.
- * Iterate through the 8 possible dividers until we
- * actually get a link with the device.
- */
-static int __vlynq_try_local(struct vlynq_device *dev)
-{
-	int i;
-
-	vlynq_reset(dev);
-
-	for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
-			i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
-		dev->dev_id ? i++ : i--) {
-
-		writel((readl(&dev->local->control) &
-				~VLYNQ_CTRL_CLOCK_MASK) |
-				VLYNQ_CTRL_CLOCK_INT |
-				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
-				&dev->local->control);
-
-		if (vlynq_linked(dev)) {
-			printk(KERN_DEBUG
-				"%s: using local clock divisor %d\n",
-				dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
-			dev->divisor = i;
-			return 0;
-		} else {
-			vlynq_reset(dev);
-		}
-	}
-
-	return -ENODEV;
-}
-
-/*
- * When using external clocking method, serial clock
- * is supplied by an external oscillator, therefore we
- * should mask the local clock bit in the clock control
- * register for both the bus master and the remote device.
- */
-static int __vlynq_try_external(struct vlynq_device *dev)
-{
-	vlynq_reset(dev);
-	if (!vlynq_linked(dev))
-		return -ENODEV;
-
-	writel((readl(&dev->remote->control) &
-			~VLYNQ_CTRL_CLOCK_INT),
-			&dev->remote->control);
-
-	writel((readl(&dev->local->control) &
-			~VLYNQ_CTRL_CLOCK_INT),
-			&dev->local->control);
-
-	if (vlynq_linked(dev)) {
-		printk(KERN_DEBUG "%s: using external clock\n",
-			dev_name(&dev->dev));
-			dev->divisor = vlynq_div_external;
-		return 0;
-	}
-
-	return -ENODEV;
-}
-
-static int __vlynq_enable_device(struct vlynq_device *dev)
-{
-	int result;
-	struct plat_vlynq_ops *ops = dev->dev.platform_data;
-
-	result = ops->on(dev);
-	if (result)
-		return result;
-
-	switch (dev->divisor) {
-	case vlynq_div_external:
-	case vlynq_div_auto:
-		/* When the device is brought from reset it should have clock
-		 * generation negotiated by hardware.
-		 * Check which device is generating clocks and perform setup
-		 * accordingly */
-		if (vlynq_linked(dev) && readl(&dev->remote->control) &
-		   VLYNQ_CTRL_CLOCK_INT) {
-			if (!__vlynq_try_remote(dev) ||
-				!__vlynq_try_local(dev)  ||
-				!__vlynq_try_external(dev))
-				return 0;
-		} else {
-			if (!__vlynq_try_external(dev) ||
-				!__vlynq_try_local(dev)    ||
-				!__vlynq_try_remote(dev))
-				return 0;
-		}
-		break;
-	case vlynq_ldiv1:
-	case vlynq_ldiv2:
-	case vlynq_ldiv3:
-	case vlynq_ldiv4:
-	case vlynq_ldiv5:
-	case vlynq_ldiv6:
-	case vlynq_ldiv7:
-	case vlynq_ldiv8:
-		writel(VLYNQ_CTRL_CLOCK_INT |
-			VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
-			vlynq_ldiv1), &dev->local->control);
-		writel(0, &dev->remote->control);
-		if (vlynq_linked(dev)) {
-			printk(KERN_DEBUG
-				"%s: using local clock divisor %d\n",
-				dev_name(&dev->dev),
-				dev->divisor - vlynq_ldiv1 + 1);
-			return 0;
-		}
-		break;
-	case vlynq_rdiv1:
-	case vlynq_rdiv2:
-	case vlynq_rdiv3:
-	case vlynq_rdiv4:
-	case vlynq_rdiv5:
-	case vlynq_rdiv6:
-	case vlynq_rdiv7:
-	case vlynq_rdiv8:
-		writel(0, &dev->local->control);
-		writel(VLYNQ_CTRL_CLOCK_INT |
-			VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
-			vlynq_rdiv1), &dev->remote->control);
-		if (vlynq_linked(dev)) {
-			printk(KERN_DEBUG
-				"%s: using remote clock divisor %d\n",
-				dev_name(&dev->dev),
-				dev->divisor - vlynq_rdiv1 + 1);
-			return 0;
-		}
-		break;
-	}
-
-	ops->off(dev);
-	return -ENODEV;
-}
-
-int vlynq_enable_device(struct vlynq_device *dev)
-{
-	struct plat_vlynq_ops *ops = dev->dev.platform_data;
-	int result = -ENODEV;
-
-	result = __vlynq_enable_device(dev);
-	if (result)
-		return result;
-
-	result = vlynq_setup_irq(dev);
-	if (result)
-		ops->off(dev);
-
-	dev->enabled = !result;
-	return result;
-}
-EXPORT_SYMBOL(vlynq_enable_device);
-
-
-void vlynq_disable_device(struct vlynq_device *dev)
-{
-	struct plat_vlynq_ops *ops = dev->dev.platform_data;
-
-	dev->enabled = 0;
-	free_irq(dev->irq, dev);
-	ops->off(dev);
-}
-EXPORT_SYMBOL(vlynq_disable_device);
-
-int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
-			    struct vlynq_mapping *mapping)
-{
-	int i;
-
-	if (!dev->enabled)
-		return -ENXIO;
-
-	writel(tx_offset, &dev->local->tx_offset);
-	for (i = 0; i < 4; i++) {
-		writel(mapping[i].offset, &dev->local->rx_mapping[i].offset);
-		writel(mapping[i].size, &dev->local->rx_mapping[i].size);
-	}
-	return 0;
-}
-EXPORT_SYMBOL(vlynq_set_local_mapping);
-
-int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
-			     struct vlynq_mapping *mapping)
-{
-	int i;
-
-	if (!dev->enabled)
-		return -ENXIO;
-
-	writel(tx_offset, &dev->remote->tx_offset);
-	for (i = 0; i < 4; i++) {
-		writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset);
-		writel(mapping[i].size, &dev->remote->rx_mapping[i].size);
-	}
-	return 0;
-}
-EXPORT_SYMBOL(vlynq_set_remote_mapping);
-
-int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
-{
-	int irq = dev->irq_start + virq;
-	if (dev->enabled)
-		return -EBUSY;
-
-	if ((irq < dev->irq_start) || (irq > dev->irq_end))
-		return -EINVAL;
-
-	if (virq == dev->remote_irq)
-		return -EINVAL;
-
-	dev->local_irq = virq;
-
-	return 0;
-}
-EXPORT_SYMBOL(vlynq_set_local_irq);
-
-int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
-{
-	int irq = dev->irq_start + virq;
-	if (dev->enabled)
-		return -EBUSY;
-
-	if ((irq < dev->irq_start) || (irq > dev->irq_end))
-		return -EINVAL;
-
-	if (virq == dev->local_irq)
-		return -EINVAL;
-
-	dev->remote_irq = virq;
-
-	return 0;
-}
-EXPORT_SYMBOL(vlynq_set_remote_irq);
-
-static int vlynq_probe(struct platform_device *pdev)
-{
-	struct vlynq_device *dev;
-	struct resource *regs_res, *mem_res, *irq_res;
-	int len, result;
-
-	regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
-	if (!regs_res)
-		return -ENODEV;
-
-	mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
-	if (!mem_res)
-		return -ENODEV;
-
-	irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
-	if (!irq_res)
-		return -ENODEV;
-
-	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
-	if (!dev) {
-		printk(KERN_ERR
-		       "vlynq: failed to allocate device structure\n");
-		return -ENOMEM;
-	}
-
-	dev->id = pdev->id;
-	dev->dev.bus = &vlynq_bus_type;
-	dev->dev.parent = &pdev->dev;
-	dev_set_name(&dev->dev, "vlynq%d", dev->id);
-	dev->dev.platform_data = pdev->dev.platform_data;
-	dev->dev.release = vlynq_device_release;
-
-	dev->regs_start = regs_res->start;
-	dev->regs_end = regs_res->end;
-	dev->mem_start = mem_res->start;
-	dev->mem_end = mem_res->end;
-
-	len = resource_size(regs_res);
-	if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) {
-		printk(KERN_ERR "%s: Can't request vlynq registers\n",
-		       dev_name(&dev->dev));
-		result = -ENXIO;
-		goto fail_request;
-	}
-
-	dev->local = ioremap(regs_res->start, len);
-	if (!dev->local) {
-		printk(KERN_ERR "%s: Can't remap vlynq registers\n",
-		       dev_name(&dev->dev));
-		result = -ENXIO;
-		goto fail_remap;
-	}
-
-	dev->remote = (struct vlynq_regs *)((void *)dev->local +
-					    VLYNQ_REMOTE_OFFSET);
-
-	dev->irq = platform_get_irq_byname(pdev, "irq");
-	dev->irq_start = irq_res->start;
-	dev->irq_end = irq_res->end;
-	dev->local_irq = dev->irq_end - dev->irq_start;
-	dev->remote_irq = dev->local_irq - 1;
-
-	if (device_register(&dev->dev))
-		goto fail_register;
-	platform_set_drvdata(pdev, dev);
-
-	printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
-	       dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
-	       (void *)dev->mem_start);
-
-	dev->dev_id = 0;
-	dev->divisor = vlynq_div_auto;
-	result = __vlynq_enable_device(dev);
-	if (result == 0) {
-		dev->dev_id = readl(&dev->remote->chip);
-		((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
-	}
-	if (dev->dev_id)
-		printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);
-
-	return 0;
-
-fail_register:
-	iounmap(dev->local);
-fail_remap:
-fail_request:
-	release_mem_region(regs_res->start, len);
-	kfree(dev);
-	return result;
-}
-
-static int vlynq_remove(struct platform_device *pdev)
-{
-	struct vlynq_device *dev = platform_get_drvdata(pdev);
-
-	device_unregister(&dev->dev);
-	iounmap(dev->local);
-	release_mem_region(dev->regs_start,
-			   dev->regs_end - dev->regs_start + 1);
-
-	kfree(dev);
-
-	return 0;
-}
-
-static struct platform_driver vlynq_platform_driver = {
-	.driver.name = "vlynq",
-	.probe = vlynq_probe,
-	.remove = vlynq_remove,
-};
-
-struct bus_type vlynq_bus_type = {
-	.name = "vlynq",
-	.match = vlynq_device_match,
-	.probe = vlynq_device_probe,
-	.remove = vlynq_device_remove,
-};
-EXPORT_SYMBOL(vlynq_bus_type);
-
-static int vlynq_init(void)
-{
-	int res = 0;
-
-	res = bus_register(&vlynq_bus_type);
-	if (res)
-		goto fail_bus;
-
-	res = platform_driver_register(&vlynq_platform_driver);
-	if (res)
-		goto fail_platform;
-
-	return 0;
-
-fail_platform:
-	bus_unregister(&vlynq_bus_type);
-fail_bus:
-	return res;
-}
-
-static void vlynq_exit(void)
-{
-	platform_driver_unregister(&vlynq_platform_driver);
-	bus_unregister(&vlynq_bus_type);
-}
-
-module_init(vlynq_init);
-module_exit(vlynq_exit);

include/linux/vlynq.h

···
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Copyright (C) 2006, 2007 Eugene Konev <[e-mail]>
- */
-
-#ifndef __VLYNQ_H__
-#define __VLYNQ_H__
-
-#include <linux/device.h>
-#include <linux/types.h>
-
-struct module;
-
-#define VLYNQ_NUM_IRQS 32
-
-struct vlynq_mapping {
-	u32 size;
-	u32 offset;
-};
-
-enum vlynq_divisor {
-	vlynq_div_auto = 0,
-	vlynq_ldiv1,
-	vlynq_ldiv2,
-	vlynq_ldiv3,
-	vlynq_ldiv4,
-	vlynq_ldiv5,
-	vlynq_ldiv6,
-	vlynq_ldiv7,
-	vlynq_ldiv8,
-	vlynq_rdiv1,
-	vlynq_rdiv2,
-	vlynq_rdiv3,
-	vlynq_rdiv4,
-	vlynq_rdiv5,
-	vlynq_rdiv6,
-	vlynq_rdiv7,
-	vlynq_rdiv8,
-	vlynq_div_external
-};
-
-struct vlynq_device_id {
-	u32 id;
-	enum vlynq_divisor divisor;
-	unsigned long driver_data;
-};
-
-struct vlynq_regs;
-struct vlynq_device {
-	u32 id, dev_id;
-	int local_irq;
-	int remote_irq;
-	enum vlynq_divisor divisor;
-	u32 regs_start, regs_end;
-	u32 mem_start, mem_end;
-	u32 irq_start, irq_end;
-	int irq;
-	int enabled;
-	struct vlynq_regs *local;
-	struct vlynq_regs *remote;
-	struct device dev;
-};
-
-struct vlynq_driver {
-	char *name;
-	struct vlynq_device_id *id_table;
-	int (*probe)(struct vlynq_device *dev, struct vlynq_device_id *id);
-	void (*remove)(struct vlynq_device *dev);
-	struct device_driver driver;
-};
-
-struct plat_vlynq_ops {
-	int (*on)(struct vlynq_device *dev);
-	void (*off)(struct vlynq_device *dev);
-};
-
-static inline struct vlynq_driver *to_vlynq_driver(struct device_driver *drv)
-{
-	return container_of(drv, struct vlynq_driver, driver);
-}
-
-static inline struct vlynq_device *to_vlynq_device(struct device *device)
-{
-	return container_of(device, struct vlynq_device, dev);
-}
-
-extern struct bus_type vlynq_bus_type;
-
-extern int __vlynq_register_driver(struct vlynq_driver *driver,
-				   struct module *owner);
-
-static inline int vlynq_register_driver(struct vlynq_driver *driver)
-{
-	return __vlynq_register_driver(driver, THIS_MODULE);
-}
-
-static inline void *vlynq_get_drvdata(struct vlynq_device *dev)
-{
-	return dev_get_drvdata(&dev->dev);
-}
-
-static inline void vlynq_set_drvdata(struct vlynq_device *dev, void *data)
-{
-	dev_set_drvdata(&dev->dev, data);
-}
-
-static inline u32 vlynq_mem_start(struct vlynq_device *dev)
-{
-	return dev->mem_start;
-}
-
-static inline u32 vlynq_mem_end(struct vlynq_device *dev)
-{
-	return dev->mem_end;
-}
-
-static inline u32 vlynq_mem_len(struct vlynq_device *dev)
-{
-	return dev->mem_end - dev->mem_start + 1;
-}
-
-static inline int vlynq_virq_to_irq(struct vlynq_device *dev, int virq)
-{
-	int irq = dev->irq_start + virq;
-	if ((irq < dev->irq_start) || (irq > dev->irq_end))
-		return -EINVAL;
-
-	return irq;
-}
-
-static inline int vlynq_irq_to_virq(struct vlynq_device *dev, int irq)
-{
-	if ((irq < dev->irq_start) || (irq > dev->irq_end))
-		return -EINVAL;
-
-	return irq - dev->irq_start;
-}
-
-extern void vlynq_unregister_driver(struct vlynq_driver *driver);
-extern int vlynq_enable_device(struct vlynq_device *dev);
-extern void vlynq_disable_device(struct vlynq_device *dev);
-extern int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
-				   struct vlynq_mapping *mapping);
-extern int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
-				    struct vlynq_mapping *mapping);
-extern int vlynq_set_local_irq(struct vlynq_device *dev, int virq);
-extern int vlynq_set_remote_irq(struct vlynq_device *dev, int virq);
-
-#endif /* __VLYNQ_H__ */