arch/mips/ath79/common.c

   1 /*
   2  *  Atheros AR71XX/AR724X/AR913X common routines
   3  *
   4  *  Copyright (C) 2008-2010 Gabor Juhos <[email protected]>
   5  *  Copyright (C) 2008 Imre Kaloz <[email protected]>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify it
   8  *  under the terms of the GNU General Public License version 2 as published
   9  *  by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/spinlock.h>
  16
  17 #include <asm/mach-ath79/ath79.h>
  18 #include <asm/mach-ath79/ar71xx_regs.h>
  19 #include "common.h"
  20
  21 static DEFINE_SPINLOCK(ath79_device_reset_lock);
  22
  23 u32 ath79_cpu_freq;
  24 EXPORT_SYMBOL_GPL(ath79_cpu_freq);
  25
  26 u32 ath79_ahb_freq;
  27 EXPORT_SYMBOL_GPL(ath79_ahb_freq);
  28
  29 u32 ath79_ddr_freq;
  30 EXPORT_SYMBOL_GPL(ath79_ddr_freq);
  31
  32 enum ath79_soc_type ath79_soc;
  33
  34 void __iomem *ath79_pll_base;
  35 void __iomem *ath79_reset_base;
  36 EXPORT_SYMBOL_GPL(ath79_reset_base);
  37 void __iomem *ath79_ddr_base;
  38
  39 void ath79_ddr_wb_flush(u32 reg)
  40 {
  41         void __iomem *flush_reg = ath79_ddr_base + reg;
  42
  43         /* Flush the DDR write buffer. */
  44         __raw_writel(0x1, flush_reg);
  45         while (__raw_readl(flush_reg) & 0x1)
  46                 ;
  47
  48         /* It must be run twice. */
  49         __raw_writel(0x1, flush_reg);
  50         while (__raw_readl(flush_reg) & 0x1)
  51                 ;
  52 }
  53 EXPORT_SYMBOL_GPL(ath79_ddr_wb_flush);
  54
  55 void ath79_device_reset_set(u32 mask)
  56 {
  57         unsigned long flags;
  58         u32 reg;
  59         u32 t;
  60
  61         if (soc_is_ar71xx())
  62                 reg = AR71XX_RESET_REG_RESET_MODULE;
  63         else if (soc_is_ar724x())
  64                 reg = AR724X_RESET_REG_RESET_MODULE;
  65         else if (soc_is_ar913x())
  66                 reg = AR913X_RESET_REG_RESET_MODULE;
  67         else
  68                 BUG();
  69
  70         spin_lock_irqsave(&ath79_device_reset_lock, flags);
  71         t = ath79_reset_rr(reg);
  72         ath79_reset_wr(reg, t | mask);
  73         spin_unlock_irqrestore(&ath79_device_reset_lock, flags);
  74 }
  75 EXPORT_SYMBOL_GPL(ath79_device_reset_set);
  76
  77 void ath79_device_reset_clear(u32 mask)
  78 {
  79         unsigned long flags;
  80         u32 reg;
  81         u32 t;
  82
  83         if (soc_is_ar71xx())
  84                 reg = AR71XX_RESET_REG_RESET_MODULE;
  85         else if (soc_is_ar724x())
  86                 reg = AR724X_RESET_REG_RESET_MODULE;
  87         else if (soc_is_ar913x())
  88                 reg = AR913X_RESET_REG_RESET_MODULE;
  89         else
  90                 BUG();
  91
  92         spin_lock_irqsave(&ath79_device_reset_lock, flags);
  93         t = ath79_reset_rr(reg);
  94         ath79_reset_wr(reg, t & ~mask);
  95         spin_unlock_irqrestore(&ath79_device_reset_lock, flags);
  96 }
  97 EXPORT_SYMBOL_GPL(ath79_device_reset_clear);