1 // SPDX-License-Identifier: GPL-2.0-only 1
2 /*
3 * Au1300 media block power gating (VSS)
4 *
5 * This is a stop-gap solution until I have th
6 * ready. This stuff here really must be handl
7 * for various media blocks are enabled/disabl
8 */
9
10 #include <linux/export.h>
11 #include <linux/spinlock.h>
12 #include <asm/mach-au1x00/au1000.h>
13
14 #define VSS_GATE 0x00 /* gate wait t
15 #define VSS_CLKRST 0x04 /* clock/block
16 #define VSS_FTR 0x08 /* footers */
17
18 #define VSS_ADDR(blk) (KSEG1ADDR(AU1300_VSS_
19
20 static DEFINE_SPINLOCK(au1300_vss_lock);
21
22 /* enable a block as outlined in the databook
23 static inline void __enable_block(int block)
24 {
25 void __iomem *base = (void __iomem *)V
26
27 __raw_writel(3, base + VSS_CLKRST);
28 wmb();
29
30 __raw_writel(0x01fffffe, base + VSS_GA
31 wmb();
32
33 /* enable footers in sequence */
34 __raw_writel(0x01, base + VSS_FTR);
35 wmb();
36 __raw_writel(0x03, base + VSS_FTR);
37 wmb();
38 __raw_writel(0x07, base + VSS_FTR);
39 wmb();
40 __raw_writel(0x0f, base + VSS_FTR);
41 wmb();
42
43 __raw_writel(0x01ffffff, base + VSS_GA
44 wmb();
45
46 __raw_writel(2, base + VSS_CLKRST);
47 wmb();
48
49 __raw_writel(0x1f, base + VSS_FTR);
50 wmb();
51 }
52
53 /* disable a block as outlined in the databook
54 static inline void __disable_block(int block)
55 {
56 void __iomem *base = (void __iomem *)V
57
58 __raw_writel(0x0f, base + VSS_FTR);
59 wmb();
60 __raw_writel(0, base + VSS_GATE);
61 wmb();
62 __raw_writel(3, base + VSS_CLKRST);
63 wmb();
64 __raw_writel(1, base + VSS_CLKRST);
65 wmb();
66 __raw_writel(0, base + VSS_FTR);
67 wmb();
68 }
69
70 void au1300_vss_block_control(int block, int e
71 {
72 unsigned long flags;
73
74 if (alchemy_get_cputype() != ALCHEMY_C
75 return;
76
77 /* only one block at a time */
78 spin_lock_irqsave(&au1300_vss_lock, fl
79 if (enable)
80 __enable_block(block);
81 else
82 __disable_block(block);
83 spin_unlock_irqrestore(&au1300_vss_loc
84 }
85 EXPORT_SYMBOL_GPL(au1300_vss_block_control);
86
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