target/linux/ar71xx/files/arch/mips/ar71xx/mach-rb750.c

   1 /*
   2  *  MikroTik RouterBOARD 750 support
   3  *
   4  *  Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2 as published
   8  *  by the Free Software Foundation.
   9  */
  10
  11 #include <asm/mach-ar71xx/ar71xx.h>
  12 #include <asm/mach-ar71xx/mach-rb750.h>
  13
  14 #include "machtype.h"
  15 #include "dev-ap91-eth.h"
  16
  17 int rb750_latch_change(u32 mask_clr, u32 mask_set)
  18 {
  19         static DEFINE_SPINLOCK(lock);
  20         static u32 latch_set = RB750_LED_BITS | RB750_LVC573_LE;
  21         static u32 latch_oe;
  22         static u32 latch_clr;
  23         unsigned long flags;
  24         u32 t;
  25         int ret = 0;
  26
  27         spin_lock_irqsave(&lock, flags);
  28
  29         if ((mask_clr & BIT(31)) != 0 &&
  30             (latch_set & RB750_LVC573_LE) == 0) {
  31                 goto unlock;
  32         }
  33
  34         latch_set = (latch_set | mask_set) & ~mask_clr;
  35         latch_clr = (latch_clr | mask_clr) & ~mask_set;
  36
  37         if (latch_oe == 0)
  38                 latch_oe = __raw_readl(ar71xx_gpio_base + GPIO_REG_OE);
  39
  40         if (likely(latch_set & RB750_LVC573_LE)) {
  41                 void __iomem *base = ar71xx_gpio_base;
  42
  43                 t = __raw_readl(base + GPIO_REG_OE);
  44                 t |= mask_clr | latch_oe | mask_set;
  45
  46                 __raw_writel(t, base + GPIO_REG_OE);
  47                 __raw_writel(latch_clr, base + GPIO_REG_CLEAR);
  48                 __raw_writel(latch_set, base + GPIO_REG_SET);
  49         } else if (mask_clr & RB750_LVC573_LE) {
  50                 void __iomem *base = ar71xx_gpio_base;
  51
  52                 latch_oe = __raw_readl(base + GPIO_REG_OE);
  53                 __raw_writel(RB750_LVC573_LE, base + GPIO_REG_CLEAR);
  54                 /* flush write */
  55                 __raw_readl(base + GPIO_REG_CLEAR);
  56         }
  57
  58         ret = 1;
  59
  60  unlock:
  61         spin_unlock_irqrestore(&lock, flags);
  62         return ret;
  63 }
  64 EXPORT_SYMBOL_GPL(rb750_latch_change);
  65
  66 static void __init rb750_setup(void)
  67 {
  68         ap91_eth_init(NULL);
  69 }
  70
  71 MIPS_MACHINE(AR71XX_MACH_RB_750, "750i", "MikroTik RouterBOARD 750",
  72              rb750_setup);