#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/device.h>
+#include <linux/delay.h>
#include <linux/io.h>
#include <linux/vlynq.h>
#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
return 0;
}
+static void vlynq_reset(struct vlynq_device *dev)
+{
+ vlynq_reg_write(dev->local->control,
+ vlynq_reg_read(dev->local->control) |
+ VLYNQ_CTRL_RESET);
+
+ /* Wait for the devices to finish resetting */
+ msleep(5);
+
+ /* Remove reset bit */
+ vlynq_reg_write(dev->local->control,
+ vlynq_reg_read(dev->local->control) &
+ ~VLYNQ_CTRL_RESET);
+
+ /* Give some time for the devices to settle */
+ msleep(5);
+}
+
static void vlynq_irq_unmask(unsigned int irq)
{
u32 val;
{
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, flag;
while (ids->id) {
- flag = 0;
- if (ids->divisor != vlynq_div_auto
- && vdev->divisor == vlynq_div_auto) {
- flag = 1;
+ if (ids->id == vdev->dev_id) {
vdev->divisor = ids->divisor;
- result = __vlynq_enable_device(vdev);
- if (result == 0) {
- id = vlynq_reg_read(vdev->remote->chip);
- vlynq_reg_write(vdev->local->control, 0);
- vlynq_reg_write(vdev->remote->control, 0);
- ops->off(vdev);
- } else
- id = vdev->dev_id;
- } else
- id = vdev->dev_id;
- if (ids->id == id) {
- vdev->dev_id = id;
vlynq_set_drvdata(vdev, ids);
printk(KERN_INFO "Driver found for VLYNQ " \
- "device: %08x\n", id);
+ "device: %08x\n", vdev->dev_id);
return 1;
}
- printk(KERN_INFO "Not using the %08x VLYNQ device's " \
- "driver for VLYNQ device: %08x\n", ids->id, id);
+ printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver" \
+ " for VLYNQ device: %08x\n", ids->id, vdev->dev_id);
ids++;
- if (flag)
- vdev->divisor = vlynq_div_auto;
}
return 0;
}
}
EXPORT_SYMBOL(vlynq_unregister_driver);
-static int __vlynq_enable_device(struct vlynq_device *dev)
+static int __vlynq_try_remote(struct vlynq_device *dev)
{
- int i, result;
- struct plat_vlynq_ops *ops = dev->dev.platform_data;
+ int i;
- result = ops->on(dev);
- if (result)
- return result;
+ 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;
+
+ vlynq_reg_write(dev->remote->control,
+ (vlynq_reg_read(dev->remote->control) &
+ ~VLYNQ_CTRL_CLOCK_MASK) |
+ VLYNQ_CTRL_CLOCK_INT |
+ VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1));
+ vlynq_reg_write(dev->local->control,
+ ((vlynq_reg_read(dev->local->control)
+ & ~(VLYNQ_CTRL_CLOCK_INT |
+ VLYNQ_CTRL_CLOCK_MASK)) |
+ VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1)));
+
+ if (vlynq_linked(dev)) {
+ printk(KERN_DEBUG
+ "%s: using remote clock divisor %d\n",
+ dev->dev.bus_id, i - vlynq_rdiv1 + 1);
+ dev->divisor = i;
+ return 0;
+ } else {
+ vlynq_reset(dev);
+ }
+ }
+
+ return -ENODEV;
+}
+
+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--) {
+
+ vlynq_reg_write(dev->local->control,
+ (vlynq_reg_read(dev->local->control) &
+ ~VLYNQ_CTRL_CLOCK_MASK) |
+ 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;
+ } else {
+ vlynq_reset(dev);
+ }
+ }
+
+ return -ENODEV;
+}
+
+static int __vlynq_try_external(struct vlynq_device *dev)
+{
+ vlynq_reset(dev);
+ if (!vlynq_linked(dev))
+ return -ENODEV;
+
+ vlynq_reg_write(dev->remote->control,
+ (vlynq_reg_read(dev->remote->control) &
+ ~VLYNQ_CTRL_CLOCK_INT));
+
+ vlynq_reg_write(dev->local->control,
+ (vlynq_reg_read(dev->local->control) &
+ ~VLYNQ_CTRL_CLOCK_INT));
- 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);
+ 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:
- /* Only try locally supplied clock, others cause problems */
- vlynq_reg_write(dev->local->control, 0);
- 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;
+ /* 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) && vlynq_reg_read(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:
vlynq_reg_write(dev->local->control,
dev->dev.bus_id, (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 = vlynq_reg_read(dev->remote->chip);
- vlynq_reg_write(dev->local->control, 0);
- vlynq_reg_write(dev->remote->control, 0);
((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
- } else
- dev->dev_id = 0;
+ }
if (dev->dev_id)
printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);
projects / openwrt.git / blobdiff