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24b0e3e84f
The DDR controller need to be used by the IRQ controller to flush the write buffer of some devices before running the IRQ handler. It is also used by the PCI controller to setup the PCI memory windows. The current interface used to access the DDR controller doesn't provides any useful abstraction and simply rely on a shared global pointer. Replace this by a simple API to setup the PCI memory windows and use the write buffer flush independently of the SoC type. That remove the need for the shared global pointer, simplify the IRQ handler code. [ralf@linux-mips.org: Folded in Alban Bedel's follup fix.] Signed-off-by: Alban Bedel <albeu@free.fr> Cc: linux-mips@linux-mips.org Cc: Andrew Bresticker <abrestic@chromium.org> Cc: Qais Yousef <qais.yousef@imgtec.com> Cc: Wolfram Sang <wsa@the-dreams.de> Cc: Sergey Ryazanov <ryazanov.s.a@gmail.com> Cc: Gabor Juhos <juhosg@openwrt.org> Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/9773/ Patchwork: http://patchwork.linux-mips.org/patch/10543/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
/*
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* Atheros AR71XX/AR724X/AR913X common routines
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*
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* Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
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* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
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*
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* Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <asm/mach-ath79/ath79.h>
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#include <asm/mach-ath79/ar71xx_regs.h>
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#include "common.h"
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static DEFINE_SPINLOCK(ath79_device_reset_lock);
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u32 ath79_cpu_freq;
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EXPORT_SYMBOL_GPL(ath79_cpu_freq);
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u32 ath79_ahb_freq;
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EXPORT_SYMBOL_GPL(ath79_ahb_freq);
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u32 ath79_ddr_freq;
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EXPORT_SYMBOL_GPL(ath79_ddr_freq);
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enum ath79_soc_type ath79_soc;
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unsigned int ath79_soc_rev;
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void __iomem *ath79_pll_base;
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void __iomem *ath79_reset_base;
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EXPORT_SYMBOL_GPL(ath79_reset_base);
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static void __iomem *ath79_ddr_base;
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static void __iomem *ath79_ddr_wb_flush_base;
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static void __iomem *ath79_ddr_pci_win_base;
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void ath79_ddr_ctrl_init(void)
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{
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ath79_ddr_base = ioremap_nocache(AR71XX_DDR_CTRL_BASE,
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AR71XX_DDR_CTRL_SIZE);
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if (soc_is_ar71xx() || soc_is_ar934x()) {
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ath79_ddr_wb_flush_base = ath79_ddr_base + 0x9c;
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ath79_ddr_pci_win_base = ath79_ddr_base + 0x7c;
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} else {
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ath79_ddr_wb_flush_base = ath79_ddr_base + 0x7c;
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ath79_ddr_pci_win_base = 0;
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}
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}
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EXPORT_SYMBOL_GPL(ath79_ddr_ctrl_init);
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void ath79_ddr_wb_flush(u32 reg)
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{
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void __iomem *flush_reg = ath79_ddr_wb_flush_base + reg;
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/* Flush the DDR write buffer. */
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__raw_writel(0x1, flush_reg);
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while (__raw_readl(flush_reg) & 0x1)
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;
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/* It must be run twice. */
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__raw_writel(0x1, flush_reg);
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while (__raw_readl(flush_reg) & 0x1)
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;
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}
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EXPORT_SYMBOL_GPL(ath79_ddr_wb_flush);
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void ath79_ddr_set_pci_windows(void)
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{
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BUG_ON(!ath79_ddr_pci_win_base);
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__raw_writel(AR71XX_PCI_WIN0_OFFS, ath79_ddr_pci_win_base + 0);
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__raw_writel(AR71XX_PCI_WIN1_OFFS, ath79_ddr_pci_win_base + 1);
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__raw_writel(AR71XX_PCI_WIN2_OFFS, ath79_ddr_pci_win_base + 2);
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__raw_writel(AR71XX_PCI_WIN3_OFFS, ath79_ddr_pci_win_base + 3);
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__raw_writel(AR71XX_PCI_WIN4_OFFS, ath79_ddr_pci_win_base + 4);
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__raw_writel(AR71XX_PCI_WIN5_OFFS, ath79_ddr_pci_win_base + 5);
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__raw_writel(AR71XX_PCI_WIN6_OFFS, ath79_ddr_pci_win_base + 6);
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__raw_writel(AR71XX_PCI_WIN7_OFFS, ath79_ddr_pci_win_base + 7);
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}
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EXPORT_SYMBOL_GPL(ath79_ddr_set_pci_windows);
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void ath79_device_reset_set(u32 mask)
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{
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unsigned long flags;
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u32 reg;
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u32 t;
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if (soc_is_ar71xx())
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reg = AR71XX_RESET_REG_RESET_MODULE;
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else if (soc_is_ar724x())
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reg = AR724X_RESET_REG_RESET_MODULE;
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else if (soc_is_ar913x())
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reg = AR913X_RESET_REG_RESET_MODULE;
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else if (soc_is_ar933x())
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reg = AR933X_RESET_REG_RESET_MODULE;
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else if (soc_is_ar934x())
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reg = AR934X_RESET_REG_RESET_MODULE;
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else if (soc_is_qca955x())
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reg = QCA955X_RESET_REG_RESET_MODULE;
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else
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BUG();
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spin_lock_irqsave(&ath79_device_reset_lock, flags);
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t = ath79_reset_rr(reg);
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ath79_reset_wr(reg, t | mask);
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spin_unlock_irqrestore(&ath79_device_reset_lock, flags);
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}
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EXPORT_SYMBOL_GPL(ath79_device_reset_set);
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void ath79_device_reset_clear(u32 mask)
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{
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unsigned long flags;
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u32 reg;
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u32 t;
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if (soc_is_ar71xx())
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reg = AR71XX_RESET_REG_RESET_MODULE;
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else if (soc_is_ar724x())
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reg = AR724X_RESET_REG_RESET_MODULE;
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else if (soc_is_ar913x())
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reg = AR913X_RESET_REG_RESET_MODULE;
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else if (soc_is_ar933x())
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reg = AR933X_RESET_REG_RESET_MODULE;
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else if (soc_is_ar934x())
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reg = AR934X_RESET_REG_RESET_MODULE;
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else if (soc_is_qca955x())
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reg = QCA955X_RESET_REG_RESET_MODULE;
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else
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BUG();
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spin_lock_irqsave(&ath79_device_reset_lock, flags);
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t = ath79_reset_rr(reg);
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ath79_reset_wr(reg, t & ~mask);
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spin_unlock_irqrestore(&ath79_device_reset_lock, flags);
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}
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EXPORT_SYMBOL_GPL(ath79_device_reset_clear);
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