diff options
Diffstat (limited to 'target/linux/ar7/patches-3.9/160-vlynq_try_remote_first.patch')
| -rw-r--r-- | target/linux/ar7/patches-3.9/160-vlynq_try_remote_first.patch | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/target/linux/ar7/patches-3.9/160-vlynq_try_remote_first.patch b/target/linux/ar7/patches-3.9/160-vlynq_try_remote_first.patch new file mode 100644 index 000000000..1d1310d82 --- /dev/null +++ b/target/linux/ar7/patches-3.9/160-vlynq_try_remote_first.patch @@ -0,0 +1,300 @@ +--- a/drivers/vlynq/vlynq.c ++++ b/drivers/vlynq/vlynq.c +@@ -119,20 +119,40 @@ static int vlynq_linked(struct vlynq_dev + return 0; + } + ++static volatile int vlynq_delay_value_new = 0; ++ ++static void vlynq_delay_wait(u32 count) ++{ ++ /* Code adopted from original vlynq driver */ ++ int i = 0; ++ volatile int *ptr = &vlynq_delay_value_new; ++ *ptr = 0; ++ ++ /* We are assuming that the each cycle takes about ++ * 23 assembly instructions. */ ++ for(i = 0; i < (count + 23)/23; i++) ++ *ptr = *ptr + 1; ++} ++ + static void vlynq_reset(struct vlynq_device *dev) + { ++ u32 rtm = readl(&dev->local->revision); ++ ++ rtm = rtm < 0x00010205 || readl(&dev->local->status) & 0x800 == 0 ? ++ 0 : 0x600000; ++ + writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET, + &dev->local->control); + + /* Wait for the devices to finish resetting */ +- msleep(5); ++ vlynq_delay_wait(0xffffff); + + /* Remove reset bit */ +- writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET, ++ writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET | rtm, + &dev->local->control); + + /* Give some time for the devices to settle */ +- msleep(5); ++ vlynq_delay_wait(0xffffff); + } + + static void vlynq_irq_unmask(struct irq_data *d) +@@ -379,6 +399,61 @@ void vlynq_unregister_driver(struct vlyn + } + EXPORT_SYMBOL(vlynq_unregister_driver); + ++enum vlynq_clk_src { ++ vlynq_clk_external, ++ vlynq_clk_local, ++ vlynq_clk_remote, ++ vlynq_clk_invalid, ++}; ++ ++static int __vlynq_set_clocks(struct vlynq_device *dev, ++ enum vlynq_clk_src clk_dir, ++ int lclk_div, int rclk_div) ++{ ++ u32 reg; ++ ++ if (clk_dir == vlynq_clk_invalid) { ++ printk(KERN_ERR "%s: attempt to set invalid clocking\n", ++ dev_name(&dev->dev)); ++ return -EINVAL; ++ } ++ ++ reg = readl(&dev->local->control); ++ if (readl(&dev->local->revision) < 0x00010205) { ++ if (clk_dir & vlynq_clk_local) ++ reg |= VLYNQ_CTRL_CLOCK_INT; ++ else ++ reg &= ~VLYNQ_CTRL_CLOCK_INT; ++ } ++ reg &= ~VLYNQ_CTRL_CLOCK_MASK; ++ reg |= VLYNQ_CTRL_CLOCK_DIV(lclk_div); ++ writel(reg, &dev->local->control); ++ ++ if (!vlynq_linked(dev)) ++ return -ENODEV; ++ ++ printk(KERN_INFO "%s: local VLYNQ protocol rev. is 0x%08x\n", ++ dev_name(&dev->dev), readl(&dev->local->revision)); ++ printk(KERN_INFO "%s: remote VLYNQ protocol rev. is 0x%08x\n", ++ dev_name(&dev->dev), readl(&dev->remote->revision)); ++ ++ reg = readl(&dev->remote->control); ++ if (readl(&dev->remote->revision) < 0x00010205) { ++ if (clk_dir & vlynq_clk_remote) ++ reg |= VLYNQ_CTRL_CLOCK_INT; ++ else ++ reg &= ~VLYNQ_CTRL_CLOCK_INT; ++ } ++ reg &= ~VLYNQ_CTRL_CLOCK_MASK; ++ reg |= VLYNQ_CTRL_CLOCK_DIV(rclk_div); ++ writel(reg, &dev->remote->control); ++ ++ if (!vlynq_linked(dev)) ++ return -ENODEV; ++ ++ return 0; ++} ++ + /* + * A VLYNQ remote device can clock the VLYNQ bus master + * using a dedicated clock line. In that case, both the +@@ -392,29 +467,16 @@ static int __vlynq_try_remote(struct vly + 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--) { ++ for (i = 0; i <= 7; 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; ++ if (!__vlynq_set_clocks(dev, vlynq_clk_remote, i, i)) { ++ printk(KERN_INFO ++ "%s: using remote clock divisor %d\n", ++ dev_name(&dev->dev), i + 1); ++ dev->divisor = i + vlynq_rdiv1; + return 0; + } else { + vlynq_reset(dev); +@@ -433,25 +495,17 @@ static int __vlynq_try_remote(struct vly + */ + static int __vlynq_try_local(struct vlynq_device *dev) + { +- int i; ++ int i, dir = !dev->dev_id; + + 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; ++ for (i = dir ? 7 : 0; dir ? i >= 0 : i <= 7; dir ? i-- : i++) { ++ ++ if (!__vlynq_set_clocks(dev, vlynq_clk_local, i, 0)) { ++ printk(KERN_INFO ++ "%s: using local clock divisor %d\n", ++ dev_name(&dev->dev), i + 1); ++ dev->divisor = i + vlynq_ldiv1; + return 0; + } else { + vlynq_reset(dev); +@@ -473,18 +527,10 @@ static int __vlynq_try_external(struct v + 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; ++ if (!__vlynq_set_clocks(dev, vlynq_clk_external, 0, 0)) { ++ printk(KERN_INFO "%s: using external clock\n", ++ dev_name(&dev->dev)); ++ dev->divisor = vlynq_div_external; + return 0; + } + +@@ -501,24 +547,16 @@ static int __vlynq_enable_device(struct + 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; +- } ++ if (!__vlynq_try_remote(dev) || !__vlynq_try_local(dev)) ++ return 0; ++ case vlynq_div_external: ++ if (!__vlynq_try_external(dev)) ++ return 0; + break; + case vlynq_ldiv1: + case vlynq_ldiv2: +@@ -528,15 +566,12 @@ static int __vlynq_enable_device(struct + 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); ++ if (!__vlynq_set_clocks(dev, vlynq_clk_local, dev->divisor - ++ vlynq_ldiv1, 0)) { ++ printk(KERN_INFO ++ "%s: using local clock divisor %d\n", ++ dev_name(&dev->dev), ++ dev->divisor - vlynq_ldiv1 + 1); + return 0; + } + break; +@@ -548,20 +583,17 @@ static int __vlynq_enable_device(struct + 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); ++ if (!__vlynq_set_clocks(dev, vlynq_clk_remote, 0, ++ dev->divisor - vlynq_rdiv1)) { ++ printk(KERN_INFO ++ "%s: using remote clock divisor %d\n", ++ dev_name(&dev->dev), ++ dev->divisor - vlynq_rdiv1 + 1); + return 0; + } + break; + } +- ++ vlynq_reset(dev); + ops->off(dev); + return -ENODEV; + } +@@ -732,14 +764,14 @@ static int vlynq_probe(struct platform_d + 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_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) { ++ if (!__vlynq_enable_device(dev)) { + dev->dev_id = readl(&dev->remote->chip); ++ vlynq_reset(dev); + ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev); + } + if (dev->dev_id) |