arch/mips/ath79/common.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Atheros AR71XX/AR724X/AR913X common routines
   4  *
   5  *  Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
   6  *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
   7  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   8  *
   9  *  Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/export.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 unsigned int ath79_soc_rev;
  34
  35 void __iomem *ath79_pll_base;
  36 void __iomem *ath79_reset_base;
  37 EXPORT_SYMBOL_GPL(ath79_reset_base);
  38 static void __iomem *ath79_ddr_base;
  39 static void __iomem *ath79_ddr_wb_flush_base;
  40 static void __iomem *ath79_ddr_pci_win_base;
  41
  42 void ath79_ddr_ctrl_init(void)
  43 {
  44         ath79_ddr_base = ioremap(AR71XX_DDR_CTRL_BASE,
  45                                          AR71XX_DDR_CTRL_SIZE);
  46         if (soc_is_ar913x() || soc_is_ar724x() || soc_is_ar933x()) {
  47                 ath79_ddr_wb_flush_base = ath79_ddr_base + 0x7c;
  48                 ath79_ddr_pci_win_base = 0;
  49         } else {
  50                 ath79_ddr_wb_flush_base = ath79_ddr_base + 0x9c;
  51                 ath79_ddr_pci_win_base = ath79_ddr_base + 0x7c;
  52         }
  53 }
  54 EXPORT_SYMBOL_GPL(ath79_ddr_ctrl_init);
  55
  56 void ath79_ddr_wb_flush(u32 reg)
  57 {
  58         void __iomem *flush_reg = ath79_ddr_wb_flush_base + (reg * 4);
  59
  60         /* Flush the DDR write buffer. */
  61         __raw_writel(0x1, flush_reg);
  62         while (__raw_readl(flush_reg) & 0x1)
  63                 ;
  64
  65         /* It must be run twice. */
  66         __raw_writel(0x1, flush_reg);
  67         while (__raw_readl(flush_reg) & 0x1)
  68                 ;
  69 }
  70 EXPORT_SYMBOL_GPL(ath79_ddr_wb_flush);
  71
  72 void ath79_ddr_set_pci_windows(void)
  73 {
  74         BUG_ON(!ath79_ddr_pci_win_base);
  75
  76         __raw_writel(AR71XX_PCI_WIN0_OFFS, ath79_ddr_pci_win_base + 0x0);
  77         __raw_writel(AR71XX_PCI_WIN1_OFFS, ath79_ddr_pci_win_base + 0x4);
  78         __raw_writel(AR71XX_PCI_WIN2_OFFS, ath79_ddr_pci_win_base + 0x8);
  79         __raw_writel(AR71XX_PCI_WIN3_OFFS, ath79_ddr_pci_win_base + 0xc);
  80         __raw_writel(AR71XX_PCI_WIN4_OFFS, ath79_ddr_pci_win_base + 0x10);
  81         __raw_writel(AR71XX_PCI_WIN5_OFFS, ath79_ddr_pci_win_base + 0x14);
  82         __raw_writel(AR71XX_PCI_WIN6_OFFS, ath79_ddr_pci_win_base + 0x18);
  83         __raw_writel(AR71XX_PCI_WIN7_OFFS, ath79_ddr_pci_win_base + 0x1c);
  84 }
  85 EXPORT_SYMBOL_GPL(ath79_ddr_set_pci_windows);
  86
  87 void ath79_device_reset_set(u32 mask)
  88 {
  89         unsigned long flags;
  90         u32 reg;
  91         u32 t;
  92
  93         if (soc_is_ar71xx())
  94                 reg = AR71XX_RESET_REG_RESET_MODULE;
  95         else if (soc_is_ar724x())
  96                 reg = AR724X_RESET_REG_RESET_MODULE;
  97         else if (soc_is_ar913x())
  98                 reg = AR913X_RESET_REG_RESET_MODULE;
  99         else if (soc_is_ar933x())
 100                 reg = AR933X_RESET_REG_RESET_MODULE;
 101         else if (soc_is_ar934x())
 102                 reg = AR934X_RESET_REG_RESET_MODULE;
 103         else if (soc_is_qca953x())
 104                 reg = QCA953X_RESET_REG_RESET_MODULE;
 105         else if (soc_is_qca955x())
 106                 reg = QCA955X_RESET_REG_RESET_MODULE;
 107         else if (soc_is_qca956x() || soc_is_tp9343())
 108                 reg = QCA956X_RESET_REG_RESET_MODULE;
 109         else
 110                 BUG();
 111
 112         spin_lock_irqsave(&ath79_device_reset_lock, flags);
 113         t = ath79_reset_rr(reg);
 114         ath79_reset_wr(reg, t | mask);
 115         spin_unlock_irqrestore(&ath79_device_reset_lock, flags);
 116 }
 117 EXPORT_SYMBOL_GPL(ath79_device_reset_set);
 118
 119 void ath79_device_reset_clear(u32 mask)
 120 {
 121         unsigned long flags;
 122         u32 reg;
 123         u32 t;
 124
 125         if (soc_is_ar71xx())
 126                 reg = AR71XX_RESET_REG_RESET_MODULE;
 127         else if (soc_is_ar724x())
 128                 reg = AR724X_RESET_REG_RESET_MODULE;
 129         else if (soc_is_ar913x())
 130                 reg = AR913X_RESET_REG_RESET_MODULE;
 131         else if (soc_is_ar933x())
 132                 reg = AR933X_RESET_REG_RESET_MODULE;
 133         else if (soc_is_ar934x())
 134                 reg = AR934X_RESET_REG_RESET_MODULE;
 135         else if (soc_is_qca953x())
 136                 reg = QCA953X_RESET_REG_RESET_MODULE;
 137         else if (soc_is_qca955x())
 138                 reg = QCA955X_RESET_REG_RESET_MODULE;
 139         else if (soc_is_qca956x() || soc_is_tp9343())
 140                 reg = QCA956X_RESET_REG_RESET_MODULE;
 141         else
 142                 BUG();
 143
 144         spin_lock_irqsave(&ath79_device_reset_lock, flags);
 145         t = ath79_reset_rr(reg);
 146         ath79_reset_wr(reg, t & ~mask);
 147         spin_unlock_irqrestore(&ath79_device_reset_lock, flags);
 148 }
 149 EXPORT_SYMBOL_GPL(ath79_device_reset_clear);