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/module.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 void __iomem *ath79_ddr_base; 42 43 void ath79_ddr_wb_flush(u32 reg) 44 { 45 void __iomem *flush_reg = ath79_ddr_base + reg; 46 47 /* Flush the DDR write buffer. */ 48 __raw_writel(0x1, flush_reg); 49 while (__raw_readl(flush_reg) & 0x1) 50 ; 51 52 /* It must be run twice. */ 53 __raw_writel(0x1, flush_reg); 54 while (__raw_readl(flush_reg) & 0x1) 55 ; 56 } 57 EXPORT_SYMBOL_GPL(ath79_ddr_wb_flush); 58 59 void ath79_device_reset_set(u32 mask) 60 { 61 unsigned long flags; 62 u32 reg; 63 u32 t; 64 65 if (soc_is_ar71xx()) 66 reg = AR71XX_RESET_REG_RESET_MODULE; 67 else if (soc_is_ar724x()) 68 reg = AR724X_RESET_REG_RESET_MODULE; 69 else if (soc_is_ar913x()) 70 reg = AR913X_RESET_REG_RESET_MODULE; 71 else if (soc_is_ar933x()) 72 reg = AR933X_RESET_REG_RESET_MODULE; 73 else if (soc_is_ar934x()) 74 reg = AR934X_RESET_REG_RESET_MODULE; 75 else 76 BUG(); 77 78 spin_lock_irqsave(&ath79_device_reset_lock, flags); 79 t = ath79_reset_rr(reg); 80 ath79_reset_wr(reg, t | mask); 81 spin_unlock_irqrestore(&ath79_device_reset_lock, flags); 82 } 83 EXPORT_SYMBOL_GPL(ath79_device_reset_set); 84 85 void ath79_device_reset_clear(u32 mask) 86 { 87 unsigned long flags; 88 u32 reg; 89 u32 t; 90 91 if (soc_is_ar71xx()) 92 reg = AR71XX_RESET_REG_RESET_MODULE; 93 else if (soc_is_ar724x()) 94 reg = AR724X_RESET_REG_RESET_MODULE; 95 else if (soc_is_ar913x()) 96 reg = AR913X_RESET_REG_RESET_MODULE; 97 else if (soc_is_ar933x()) 98 reg = AR933X_RESET_REG_RESET_MODULE; 99 else if (soc_is_ar934x()) 100 reg = AR934X_RESET_REG_RESET_MODULE; 101 else 102 BUG(); 103 104 spin_lock_irqsave(&ath79_device_reset_lock, flags); 105 t = ath79_reset_rr(reg); 106 ath79_reset_wr(reg, t & ~mask); 107 spin_unlock_irqrestore(&ath79_device_reset_lock, flags); 108 } 109 EXPORT_SYMBOL_GPL(ath79_device_reset_clear); 110