diff options
Diffstat (limited to 'target/linux/ar7')
| -rw-r--r-- | target/linux/ar7/files/drivers/vlynq/vlynq.c | 150 |
1 files changed, 127 insertions, 23 deletions
diff --git a/target/linux/ar7/files/drivers/vlynq/vlynq.c b/target/linux/ar7/files/drivers/vlynq/vlynq.c index 25f303b..f4b7b0f 100644 --- a/target/linux/ar7/files/drivers/vlynq/vlynq.c +++ b/target/linux/ar7/files/drivers/vlynq/vlynq.c @@ -40,6 +40,8 @@ #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 @@ -114,6 +116,24 @@ int vlynq_linked(struct vlynq_device *dev) 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; @@ -357,9 +377,100 @@ void vlynq_unregister_driver(struct vlynq_driver *driver) } EXPORT_SYMBOL(vlynq_unregister_driver); +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; + + 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)); + + 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 i, result; + int result; struct plat_vlynq_ops *ops = dev->dev.platform_data; result = ops->on(dev); @@ -369,30 +480,23 @@ static int __vlynq_enable_device(struct vlynq_device *dev) switch (dev->divisor) { case vlynq_div_external: case vlynq_div_auto: - vlynq_reg_write(dev->local->control, 0); - vlynq_reg_write(dev->remote->control, 0); - if (vlynq_linked(dev)) { - dev->divisor = vlynq_div_external; - printk(KERN_DEBUG "%s: using external clock\n", - dev->dev.bus_id); - return 0; - } - - /* Only try locally supplied clock, others cause problems */ - 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_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, |