xref: /openbmc/linux/arch/mips/ath79/common.c (revision 4bdc0d67)
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 
ath79_ddr_ctrl_init(void)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 
ath79_ddr_wb_flush(u32 reg)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 
ath79_ddr_set_pci_windows(void)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 
ath79_device_reset_set(u32 mask)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 
ath79_device_reset_clear(u32 mask)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);
150