+/*
+ * 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_ldiv1; 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);
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