ar71xx: add latch handling code for the RB750

[openwrt/svn-archive/archive.git] / target / linux / ar71xx / files / arch / mips / ar71xx / mach-rb750.c

diff --git a/target/linux/ar71xx/files/arch/mips/ar71xx/mach-rb750.c b/target/linux/ar71xx/files/arch/mips/ar71xx/mach-rb750.c
index dd481d9eb92773b3c5e5173ad6c29fdeaf9e77c3..06f48328e4e1235cfef5eef75ba5d423ca5608bb 100644 (file)
--- a/target/linux/ar71xx/files/arch/mips/ar71xx/mach-rb750.c
+++ b/target/linux/ar71xx/files/arch/mips/ar71xx/mach-rb750.c
@@ -9,10 +9,60 @@
  */
 
 #include <asm/mach-ar71xx/ar71xx.h>
+#include <asm/mach-ar71xx/mach-rb750.h>
 
 #include "machtype.h"
 #include "dev-ap91-eth.h"
 
+int rb750_latch_change(u32 mask_clr, u32 mask_set)
+{
+       static DEFINE_SPINLOCK(lock);
+       static u32 latch_set = RB750_LED_BITS | RB750_LVC573_LE;
+       static u32 latch_oe;
+       static u32 latch_clr;
+       unsigned long flags;
+       u32 t;
+       int ret = 0;
+
+       spin_lock_irqsave(&lock, flags);
+
+       if ((mask_clr & BIT(31)) != 0 &&
+           (latch_set & RB750_LVC573_LE) == 0) {
+               goto unlock;
+       }
+
+       latch_set = (latch_set | mask_set) & ~mask_clr;
+       latch_clr = (latch_clr | mask_clr) & ~mask_set;
+
+       if (latch_oe == 0)
+               latch_oe = __raw_readl(ar71xx_gpio_base + GPIO_REG_OE);
+
+       if (likely(latch_set & RB750_LVC573_LE)) {
+               void __iomem *base = ar71xx_gpio_base;
+
+               t = __raw_readl(base + GPIO_REG_OE);
+               t |= mask_clr | latch_oe | mask_set;
+
+               __raw_writel(t, base + GPIO_REG_OE);
+               __raw_writel(latch_clr, base + GPIO_REG_CLEAR);
+               __raw_writel(latch_set, base + GPIO_REG_SET);
+       } else if (mask_clr & RB750_LVC573_LE) {
+               void __iomem *base = ar71xx_gpio_base;
+
+               latch_oe = __raw_readl(base + GPIO_REG_OE);
+               __raw_writel(RB750_LVC573_LE, base + GPIO_REG_CLEAR);
+               /* flush write */
+               __raw_readl(base + GPIO_REG_CLEAR);
+       }
+
+       ret = 1;
+
+ unlock:
+       spin_unlock_irqrestore(&lock, flags);
+       return ret;
+}
+EXPORT_SYMBOL_GPL(rb750_latch_change);
+
 static void __init rb750_setup(void)
 {
        ap91_eth_init(NULL);