arch/mips/ath79/common.c

   1 /*
   2  *  Atheros AR71XX/AR724X/AR913X common routines
   3  *
   4  *  Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
   5  *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
   6  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   7  *
   8  *  Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
   9  *
  10  *  This program is free software; you can redistribute it and/or modify it
  11  *  under the terms of the GNU General Public License version 2 as published
  12  *  by the Free Software Foundation.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/export.h>
  17 #include <linux/types.h>
  18 #include <linux/spinlock.h>
  19
  20 #include <asm/mach-ath79/ath79.h>
  21 #include <asm/mach-ath79/ar71xx_regs.h>
  22 #include "common.h"
  23
  24 static DEFINE_SPINLOCK(ath79_device_reset_lock);
  25
  26 u32 ath79_cpu_freq;
  27 EXPORT_SYMBOL_GPL(ath79_cpu_freq);
  28
  29 u32 ath79_ahb_freq;
  30 EXPORT_SYMBOL_GPL(ath79_ahb_freq);
  31
  32 u32 ath79_ddr_freq;
  33 EXPORT_SYMBOL_GPL(ath79_ddr_freq);
  34
  35 enum ath79_soc_type ath79_soc;
  36 unsigned int ath79_soc_rev;
  37
  38 void __iomem *ath79_pll_base;
  39 void __iomem *ath79_reset_base;
  40 EXPORT_SYMBOL_GPL(ath79_reset_base);
  41 static void __iomem *ath79_ddr_base;
  42 static void __iomem *ath79_ddr_wb_flush_base;
  43 static void __iomem *ath79_ddr_pci_win_base;
  44
  45 void ath79_ddr_ctrl_init(void)
  46 {
  47         ath79_ddr_base = ioremap_nocache(AR71XX_DDR_CTRL_BASE,
  48                                          AR71XX_DDR_CTRL_SIZE);
  49         if (soc_is_ar913x() || soc_is_ar724x() || soc_is_ar933x()) {
  50                 ath79_ddr_wb_flush_base = ath79_ddr_base + 0x7c;
  51                 ath79_ddr_pci_win_base = 0;
  52         } else {
  53                 ath79_ddr_wb_flush_base = ath79_ddr_base + 0x9c;
  54                 ath79_ddr_pci_win_base = ath79_ddr_base + 0x7c;
  55         }
  56 }
  57 EXPORT_SYMBOL_GPL(ath79_ddr_ctrl_init);
  58
  59 void ath79_ddr_wb_flush(u32 reg)
  60 {
  61         void __iomem *flush_reg = ath79_ddr_wb_flush_base + (reg * 4);
  62
  63         /* Flush the DDR write buffer. */
  64         __raw_writel(0x1, flush_reg);
  65         while (__raw_readl(flush_reg) & 0x1)
  66                 ;
  67
  68         /* It must be run twice. */
  69         __raw_writel(0x1, flush_reg);
  70         while (__raw_readl(flush_reg) & 0x1)
  71                 ;
  72 }
  73 EXPORT_SYMBOL_GPL(ath79_ddr_wb_flush);
  74
  75 void ath79_ddr_set_pci_windows(void)
  76 {
  77         BUG_ON(!ath79_ddr_pci_win_base);
  78
  79         __raw_writel(AR71XX_PCI_WIN0_OFFS, ath79_ddr_pci_win_base + 0x0);
  80         __raw_writel(AR71XX_PCI_WIN1_OFFS, ath79_ddr_pci_win_base + 0x4);
  81         __raw_writel(AR71XX_PCI_WIN2_OFFS, ath79_ddr_pci_win_base + 0x8);
  82         __raw_writel(AR71XX_PCI_WIN3_OFFS, ath79_ddr_pci_win_base + 0xc);
  83         __raw_writel(AR71XX_PCI_WIN4_OFFS, ath79_ddr_pci_win_base + 0x10);
  84         __raw_writel(AR71XX_PCI_WIN5_OFFS, ath79_ddr_pci_win_base + 0x14);
  85         __raw_writel(AR71XX_PCI_WIN6_OFFS, ath79_ddr_pci_win_base + 0x18);
  86         __raw_writel(AR71XX_PCI_WIN7_OFFS, ath79_ddr_pci_win_base + 0x1c);
  87 }
  88 EXPORT_SYMBOL_GPL(ath79_ddr_set_pci_windows);
  89
  90 void ath79_device_reset_set(u32 mask)
  91 {
  92         unsigned long flags;
  93         u32 reg;
  94         u32 t;
  95
  96         if (soc_is_ar71xx())
  97                 reg = AR71XX_RESET_REG_RESET_MODULE;
  98         else if (soc_is_ar724x())
  99                 reg = AR724X_RESET_REG_RESET_MODULE;
 100         else if (soc_is_ar913x())
 101                 reg = AR913X_RESET_REG_RESET_MODULE;
 102         else if (soc_is_ar933x())
 103                 reg = AR933X_RESET_REG_RESET_MODULE;
 104         else if (soc_is_ar934x())
 105                 reg = AR934X_RESET_REG_RESET_MODULE;
 106         else if (soc_is_qca955x())
 107                 reg = QCA955X_RESET_REG_RESET_MODULE;
 108         else
 109                 BUG();
 110
 111         spin_lock_irqsave(&ath79_device_reset_lock, flags);
 112         t = ath79_reset_rr(reg);
 113         ath79_reset_wr(reg, t | mask);
 114         spin_unlock_irqrestore(&ath79_device_reset_lock, flags);
 115 }
 116 EXPORT_SYMBOL_GPL(ath79_device_reset_set);
 117
 118 void ath79_device_reset_clear(u32 mask)
 119 {
 120         unsigned long flags;
 121         u32 reg;
 122         u32 t;
 123
 124         if (soc_is_ar71xx())
 125                 reg = AR71XX_RESET_REG_RESET_MODULE;
 126         else if (soc_is_ar724x())
 127                 reg = AR724X_RESET_REG_RESET_MODULE;
 128         else if (soc_is_ar913x())
 129                 reg = AR913X_RESET_REG_RESET_MODULE;
 130         else if (soc_is_ar933x())
 131                 reg = AR933X_RESET_REG_RESET_MODULE;
 132         else if (soc_is_ar934x())
 133                 reg = AR934X_RESET_REG_RESET_MODULE;
 134         else if (soc_is_qca955x())
 135                 reg = QCA955X_RESET_REG_RESET_MODULE;
 136         else
 137                 BUG();
 138
 139         spin_lock_irqsave(&ath79_device_reset_lock, flags);
 140         t = ath79_reset_rr(reg);
 141         ath79_reset_wr(reg, t & ~mask);
 142         spin_unlock_irqrestore(&ath79_device_reset_lock, flags);
 143 }
 144 EXPORT_SYMBOL_GPL(ath79_device_reset_clear);