Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi...
[sfrench/cifs-2.6.git] / arch / mips / ath79 / common.c
1 /*
2  *  Atheros AR71XX/AR724X/AR913X common routines
3  *
4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
6  *
7  *  This program is free software; you can redistribute it and/or modify it
8  *  under the terms of the GNU General Public License version 2 as published
9  *  by the Free Software Foundation.
10  */
11
12 #include <linux/kernel.h>
13 #include <linux/module.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 void __iomem *ath79_ddr_base;
39
40 void ath79_ddr_wb_flush(u32 reg)
41 {
42         void __iomem *flush_reg = ath79_ddr_base + reg;
43
44         /* Flush the DDR write buffer. */
45         __raw_writel(0x1, flush_reg);
46         while (__raw_readl(flush_reg) & 0x1)
47                 ;
48
49         /* It must be run twice. */
50         __raw_writel(0x1, flush_reg);
51         while (__raw_readl(flush_reg) & 0x1)
52                 ;
53 }
54 EXPORT_SYMBOL_GPL(ath79_ddr_wb_flush);
55
56 void ath79_device_reset_set(u32 mask)
57 {
58         unsigned long flags;
59         u32 reg;
60         u32 t;
61
62         if (soc_is_ar71xx())
63                 reg = AR71XX_RESET_REG_RESET_MODULE;
64         else if (soc_is_ar724x())
65                 reg = AR724X_RESET_REG_RESET_MODULE;
66         else if (soc_is_ar913x())
67                 reg = AR913X_RESET_REG_RESET_MODULE;
68         else if (soc_is_ar933x())
69                 reg = AR933X_RESET_REG_RESET_MODULE;
70         else
71                 BUG();
72
73         spin_lock_irqsave(&ath79_device_reset_lock, flags);
74         t = ath79_reset_rr(reg);
75         ath79_reset_wr(reg, t | mask);
76         spin_unlock_irqrestore(&ath79_device_reset_lock, flags);
77 }
78 EXPORT_SYMBOL_GPL(ath79_device_reset_set);
79
80 void ath79_device_reset_clear(u32 mask)
81 {
82         unsigned long flags;
83         u32 reg;
84         u32 t;
85
86         if (soc_is_ar71xx())
87                 reg = AR71XX_RESET_REG_RESET_MODULE;
88         else if (soc_is_ar724x())
89                 reg = AR724X_RESET_REG_RESET_MODULE;
90         else if (soc_is_ar913x())
91                 reg = AR913X_RESET_REG_RESET_MODULE;
92         else if (soc_is_ar933x())
93                 reg = AR933X_RESET_REG_RESET_MODULE;
94         else
95                 BUG();
96
97         spin_lock_irqsave(&ath79_device_reset_lock, flags);
98         t = ath79_reset_rr(reg);
99         ath79_reset_wr(reg, t & ~mask);
100         spin_unlock_irqrestore(&ath79_device_reset_lock, flags);
101 }
102 EXPORT_SYMBOL_GPL(ath79_device_reset_clear);