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92105bb7 TL |
1 | /* |
2 | * linux/arch/arm/plat-omap/sram.c | |
3 | * | |
4 | * OMAP SRAM detection and management | |
5 | * | |
6 | * Copyright (C) 2005 Nokia Corporation | |
7 | * Written by Tony Lindgren <tony@atomide.com> | |
8 | * | |
05e152c7 S |
9 | * Copyright (C) 2009-2012 Texas Instruments |
10 | * Added OMAP4/5 support - Santosh Shilimkar <santosh.shilimkar@ti.com> | |
44169075 | 11 | * |
92105bb7 TL |
12 | * This program is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | */ | |
c2d43e39 | 16 | #undef DEBUG |
92105bb7 | 17 | |
92105bb7 TL |
18 | #include <linux/module.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/init.h> | |
fced80c7 | 21 | #include <linux/io.h> |
92105bb7 | 22 | |
bf027ca1 | 23 | #include <asm/fncpy.h> |
53d9cc73 | 24 | #include <asm/tlb.h> |
92105bb7 TL |
25 | #include <asm/cacheflush.h> |
26 | ||
670c104a TL |
27 | #include <asm/mach/map.h> |
28 | ||
9fbe7c24 PW |
29 | #include <plat/sram.h> |
30 | ||
670c104a | 31 | #define ROUND_DOWN(value,boundary) ((value) & (~((boundary)-1))) |
92105bb7 | 32 | |
a66cb345 | 33 | static void __iomem *omap_sram_base; |
b2856734 | 34 | static unsigned long omap_sram_skip; |
92105bb7 | 35 | static unsigned long omap_sram_size; |
a66cb345 | 36 | static void __iomem *omap_sram_ceil; |
92105bb7 | 37 | |
b6338bdc JP |
38 | /* |
39 | * Memory allocator for SRAM: calculates the new ceiling address | |
40 | * for pushing a function using the fncpy API. | |
41 | * | |
42 | * Note that fncpy requires the returned address to be aligned | |
43 | * to an 8-byte boundary. | |
44 | */ | |
45 | void *omap_sram_push_address(unsigned long size) | |
92105bb7 | 46 | { |
a66cb345 TL |
47 | unsigned long available, new_ceil = (unsigned long)omap_sram_ceil; |
48 | ||
b2856734 | 49 | available = omap_sram_ceil - (omap_sram_base + omap_sram_skip); |
a66cb345 TL |
50 | |
51 | if (size > available) { | |
26a510ba | 52 | pr_err("Not enough space in SRAM\n"); |
92105bb7 TL |
53 | return NULL; |
54 | } | |
670c104a | 55 | |
a66cb345 TL |
56 | new_ceil -= size; |
57 | new_ceil = ROUND_DOWN(new_ceil, FNCPY_ALIGN); | |
58 | omap_sram_ceil = IOMEM(new_ceil); | |
92105bb7 TL |
59 | |
60 | return (void *)omap_sram_ceil; | |
61 | } | |
62 | ||
d8cfd6c8 TL |
63 | /* |
64 | * The SRAM context is lost during off-idle and stack | |
65 | * needs to be reset. | |
66 | */ | |
67 | void omap_sram_reset(void) | |
68 | { | |
69 | omap_sram_ceil = omap_sram_base + omap_sram_size; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early. | |
74 | */ | |
75 | void __init omap_map_sram(unsigned long start, unsigned long size, | |
76 | unsigned long skip, int cached) | |
77 | { | |
78 | if (size == 0) | |
79 | return; | |
80 | ||
81 | start = ROUND_DOWN(start, PAGE_SIZE); | |
82 | omap_sram_size = size; | |
83 | omap_sram_skip = skip; | |
84 | omap_sram_base = __arm_ioremap_exec(start, size, cached); | |
85 | if (!omap_sram_base) { | |
86 | pr_err("SRAM: Could not map\n"); | |
87 | return; | |
88 | } | |
89 | ||
90 | omap_sram_reset(); | |
91 | ||
92 | /* | |
93 | * Looks like we need to preserve some bootloader code at the | |
94 | * beginning of SRAM for jumping to flash for reboot to work... | |
95 | */ | |
96 | memset_io(omap_sram_base + omap_sram_skip, 0, | |
97 | omap_sram_size - omap_sram_skip); | |
98 | } |