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[PATCH][MIPS][3/6]: AR7: VLYNQ bus

To: linux-mips@linux-mips.org
Subject: [PATCH][MIPS][3/6]: AR7: VLYNQ bus
From: Matteo Croce <technoboy85@gmail.com>
Date: Thu, 27 Dec 2007 19:24:27 +0100
Cc: Eugene Konev <ejka@imfi.kspu.ru>, Andrew Morton <akpm@linux-foundation.org>
In-reply-to: <200712271919.23577.technoboy85@gmail.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <200712271919.23577.technoboy85@gmail.com>
Sender: linux-mips-bounce@linux-mips.org
User-agent: KMail/1.9.6 (enterprise 0.20070907.709405)
Signed-off-by: Matteo Croce <technoboy85@gmail.com>
Signed-off-by: Eugene Konev <ejka@imfi.kspu.ru>

diff --git a/drivers/vlynq/Kconfig b/drivers/vlynq/Kconfig
new file mode 100644
index 0000000..2c8ffe0
--- /dev/null
+++ b/drivers/vlynq/Kconfig
@@ -0,0 +1,13 @@
+menu "TI VLYNQ"
+
+config VLYNQ
+       bool "TI VLYNQ bus support"
+       depends on AR7 && EXPERIMENTAL
+       help
+         Support for the TI VLYNQ bus
+
+         The module will be called vlynq
+
+         If unsure, say N
+
+endmenu
diff --git a/drivers/vlynq/Makefile b/drivers/vlynq/Makefile
new file mode 100644
index 0000000..b3f6114
--- /dev/null
+++ b/drivers/vlynq/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for kernel vlynq drivers
+#
+
+obj-$(CONFIG_VLYNQ) += vlynq.o
diff --git a/drivers/vlynq/vlynq.c b/drivers/vlynq/vlynq.c
new file mode 100644
index 0000000..374562c
--- /dev/null
+++ b/drivers/vlynq/vlynq.c
@@ -0,0 +1,670 @@
+/*
+ * Copyright (C) 2006, 2007 OpenWrt.org
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#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/device.h>
+#include <linux/io.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_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];
+} __attribute__ ((packed));
+
+#define vlynq_reg_read(reg) readl(&(reg))
+#define vlynq_reg_write(reg, val)  writel(val, &(reg))
+
+static int __vlynq_enable_device(struct vlynq_device *dev);
+
+#ifdef 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
+
+int vlynq_linked(struct vlynq_device *dev)
+{
+       int i;
+
+       for (i = 0; i < 100; i++)
+               if (vlynq_reg_read(dev->local->status) & VLYNQ_STATUS_LINK)
+                       return 1;
+               else
+                       cpu_relax();
+
+       return 0;
+}
+
+static void vlynq_irq_unmask(unsigned int irq)
+{
+       u32 val;
+       struct vlynq_device *dev = get_irq_chip_data(irq);
+       int virq;
+
+       BUG_ON(!dev);
+       virq = irq - dev->irq_start;
+       val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
+       val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
+       vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
+}
+
+static void vlynq_irq_mask(unsigned int irq)
+{
+       u32 val;
+       struct vlynq_device *dev = get_irq_chip_data(irq);
+       int virq;
+
+       BUG_ON(!dev);
+       virq = irq - dev->irq_start;
+       val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
+       val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
+       vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
+}
+
+static int vlynq_irq_type(unsigned int irq, unsigned int flow_type)
+{
+       u32 val;
+       struct vlynq_device *dev = get_irq_chip_data(irq);
+       int virq;
+
+       BUG_ON(!dev);
+       virq = irq - dev->irq_start;
+       val = vlynq_reg_read(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;
+       }
+       vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
+       return 0;
+}
+
+static void vlynq_local_ack(unsigned int irq)
+{
+       struct vlynq_device *dev = get_irq_chip_data(irq);
+       u32 status = vlynq_reg_read(dev->local->status);
+       if (printk_ratelimit())
+               printk(KERN_DEBUG "%s: local status: 0x%08x\n",
+                      dev->dev.bus_id, status);
+       vlynq_reg_write(dev->local->status, status);
+}
+
+static void vlynq_remote_ack(unsigned int irq)
+{
+       struct vlynq_device *dev = get_irq_chip_data(irq);
+       u32 status = vlynq_reg_read(dev->remote->status);
+       if (printk_ratelimit())
+               printk(KERN_DEBUG "%s: remote status: 0x%08x\n",
+                      dev->dev.bus_id, status);
+       vlynq_reg_write(dev->remote->status, status);
+}
+
+static irqreturn_t vlynq_irq(int irq, void *dev_id)
+{
+       struct vlynq_device *dev = dev_id;
+       u32 status;
+       int virq = 0;
+
+       status = vlynq_reg_read(dev->local->int_status);
+       vlynq_reg_write(dev->local->int_status, 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",
+       .unmask = vlynq_irq_unmask,
+       .mask = vlynq_irq_mask,
+       .set_type = vlynq_irq_type,
+};
+
+static struct irq_chip vlynq_local_chip = {
+       .name = "vlynq local error",
+       .unmask = vlynq_irq_unmask,
+       .mask = vlynq_irq_mask,
+       .ack = vlynq_local_ack,
+};
+
+static struct irq_chip vlynq_remote_chip = {
+       .name = "vlynq local error",
+       .unmask = vlynq_irq_unmask,
+       .mask = vlynq_irq_mask,
+       .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->dev.bus_id);
+               return -EINVAL;
+       }
+
+       /* Clear local and remote error bits */
+       vlynq_reg_write(dev->local->status, vlynq_reg_read(dev->local->status));
+       vlynq_reg_write(dev->remote->status,
+                       vlynq_reg_read(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 |= vlynq_reg_read(dev->local->control);
+       vlynq_reg_write(dev->local->int_ptr, VLYNQ_INT_OFFSET);
+       vlynq_reg_write(dev->local->control, val);
+
+       val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
+       val |= VLYNQ_CTRL_INT_ENABLE;
+       val |= vlynq_reg_read(dev->remote->control);
+       vlynq_reg_write(dev->remote->int_ptr, VLYNQ_INT_OFFSET);
+       vlynq_reg_write(dev->remote->control, val);
+
+       for (i = dev->irq_start; i <= dev->irq_end; i++) {
+               virq = i - dev->irq_start;
+               if (virq == dev->local_irq) {
+                       set_irq_chip_and_handler(i, &vlynq_local_chip,
+                                                handle_level_irq);
+                       set_irq_chip_data(i, dev);
+               } else if (virq == dev->remote_irq) {
+                       set_irq_chip_and_handler(i, &vlynq_remote_chip,
+                                                handle_level_irq);
+                       set_irq_chip_data(i, dev);
+               } else {
+                       set_irq_chip_and_handler(i, &vlynq_irq_chip,
+                                                handle_simple_irq);
+                       set_irq_chip_data(i, dev);
+                       vlynq_reg_write(dev->remote->int_device[virq >> 2], 0);
+               }
+       }
+
+       if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
+               printk(KERN_ERR "%s: request_irq failed\n", dev->dev.bus_id);
+               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 plat_vlynq_ops *ops = dev->platform_data;
+       struct vlynq_device_id *ids = vdrv->id_table;
+       u32 id = 0;
+       int result;
+
+       while (ids->id) {
+               vdev->divisor = ids->divisor;
+               result = __vlynq_enable_device(vdev);
+               if (result == 0) {
+                       id = vlynq_reg_read(vdev->remote->chip);
+                       ops->off(vdev);
+                       if (ids->id == id) {
+                               vlynq_set_drvdata(vdev, ids);
+                               return 1;
+                       }
+               }
+               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;
+
+       get_device(dev);
+       if (drv && drv->probe)
+               result = drv->probe(vdev, id);
+       if (result)
+               put_device(dev);
+       return result;
+}
+
+static int vlynq_device_remove(struct device *dev)
+{
+       struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
+       if (drv && drv->remove)
+               drv->remove(to_vlynq_device(dev));
+       put_device(dev);
+       return 0;
+}
+
+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);
+
+static int __vlynq_enable_device(struct vlynq_device *dev)
+{
+       int i, result;
+       struct plat_vlynq_ops *ops = dev->dev.platform_data;
+
+       result = ops->on(dev);
+       if (result)
+               return result;
+
+       switch (dev->divisor) {
+       case vlynq_div_auto:
+               /* Only try locally supplied clock, others cause problems */
+               vlynq_reg_write(dev->remote->control, 0);
+               for (i = vlynq_ldiv2; i <= vlynq_ldiv8; i++) {
+                       vlynq_reg_write(dev->local->control,
+                                       VLYNQ_CTRL_CLOCK_INT |
+                                       VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1));
+                       if (vlynq_linked(dev)) {
+                               printk(KERN_DEBUG
+                                      "%s: using local clock divisor %d\n",
+                                      dev->dev.bus_id, i - vlynq_ldiv1 + 1);
+                               dev->divisor = i;
+                               return 0;
+                       }
+               }
+       case vlynq_ldiv1: case vlynq_ldiv2: case vlynq_ldiv3: case vlynq_ldiv4:
+       case vlynq_ldiv5: case vlynq_ldiv6: case vlynq_ldiv7: case vlynq_ldiv8:
+               vlynq_reg_write(dev->remote->control, 0);
+               vlynq_reg_write(dev->local->control,
+                               VLYNQ_CTRL_CLOCK_INT |
+                               VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
+                                                    vlynq_ldiv1));
+               if (vlynq_linked(dev)) {
+                       printk(KERN_DEBUG
+                              "%s: using local clock divisor %d\n",
+                              dev->dev.bus_id, 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:
+               vlynq_reg_write(dev->local->control, 0);
+               vlynq_reg_write(dev->remote->control,
+                               VLYNQ_CTRL_CLOCK_INT |
+                               VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
+                                                    vlynq_rdiv1));
+               if (vlynq_linked(dev)) {
+                       printk(KERN_DEBUG
+                              "%s: using remote clock divisor %d\n",
+                              dev->dev.bus_id, dev->divisor - vlynq_rdiv1 + 1);
+                       return 0;
+               }
+               break;
+       case vlynq_div_external:
+               vlynq_reg_write(dev->local->control, 0);
+               vlynq_reg_write(dev->remote->control, 0);
+               if (vlynq_linked(dev)) {
+                       printk(KERN_DEBUG "%s: using external clock\n",
+                              dev->dev.bus_id);
+                       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;
+
+       vlynq_reg_write(dev->local->tx_offset, tx_offset);
+       for (i = 0; i < 4; i++) {
+               vlynq_reg_write(dev->local->rx_mapping[i].offset,
+                                                       mapping[i].offset);
+               vlynq_reg_write(dev->local->rx_mapping[i].size,
+                                                       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;
+
+       vlynq_reg_write(dev->remote->tx_offset, tx_offset);
+       for (i = 0; i < 4; i++) {
+               vlynq_reg_write(dev->remote->rx_mapping[i].offset,
+                                                       mapping[i].offset);
+               vlynq_reg_write(dev->remote->rx_mapping[i].size,
+                                                       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;
+       snprintf(dev->dev.bus_id, BUS_ID_SIZE, "vlynq%d", dev->id);
+       dev->dev.bus_id[BUS_ID_SIZE - 1] = 0;
+       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 = regs_res->end - regs_res->start;
+       if (!request_mem_region(regs_res->start, len, dev->dev.bus_id)) {
+               printk(KERN_ERR "%s: Can't request vlynq registers\n",
+                      dev->dev.bus_id);
+               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->dev.bus_id);
+               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->dev.bus_id, (void *)dev->regs_start, dev->irq,
+              (void *)dev->mem_start);
+
+       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);
+
+       kfree(dev);
+
+       return 0;
+}
+
+static struct platform_driver vlynq_driver = {
+       .driver.name = "vlynq",
+       .probe = vlynq_probe,
+       .remove = __devexit_p(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 __devinit vlynq_init(void)
+{
+       int res = 0;
+
+       res = bus_register(&vlynq_bus_type);
+       if (res)
+               goto fail_bus;
+
+       res = platform_driver_register(&vlynq_driver);
+       if (res)
+               goto fail_platform;
+
+       return 0;
+
+fail_platform:
+       bus_unregister(&vlynq_bus_type);
+fail_bus:
+       return res;
+}
+
+static void __devexit vlynq_exit(void)
+{
+       platform_driver_unregister(&vlynq_driver);
+       bus_unregister(&vlynq_bus_type);
+}
+
+module_init(vlynq_init);
+module_exit(vlynq_exit);
diff --git a/include/linux/vlynq.h b/include/linux/vlynq.h
new file mode 100644
index 0000000..b3f2474
--- /dev/null
+++ b/include/linux/vlynq.h
@@ -0,0 +1,161 @@
+/*
+ * Copyright (C) 2006, 2007 OpenWrt.org
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef __VLYNQ_H__
+#define __VLYNQ_H__
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+#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;
+       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__ */

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