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1 | /* |
2 | * OMAP SRAM detection and management | |
3 | * | |
4 | * Copyright (C) 2005 Nokia Corporation | |
5 | * Written by Tony Lindgren <tony@atomide.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/io.h> | |
16 | ||
17 | #include <asm/fncpy.h> | |
18 | #include <asm/tlb.h> | |
19 | #include <asm/cacheflush.h> | |
20 | ||
21 | #include <asm/mach/map.h> | |
22 | ||
23 | #include "soc.h" | |
24 | #include "sram.h" | |
25 | ||
26 | #define OMAP1_SRAM_PA 0x20000000 | |
27 | #define SRAM_BOOTLOADER_SZ 0x80 | |
28 | ||
29 | /* | |
30 | * The amount of SRAM depends on the core type. | |
31 | * Note that we cannot try to test for SRAM here because writes | |
32 | * to secure SRAM will hang the system. Also the SRAM is not | |
33 | * yet mapped at this point. | |
34 | */ | |
35 | static void __init omap_detect_and_map_sram(void) | |
36 | { | |
37 | unsigned long omap_sram_skip = SRAM_BOOTLOADER_SZ; | |
38 | unsigned long omap_sram_start = OMAP1_SRAM_PA; | |
39 | unsigned long omap_sram_size; | |
40 | ||
41 | if (cpu_is_omap7xx()) | |
42 | omap_sram_size = 0x32000; /* 200K */ | |
43 | else if (cpu_is_omap15xx()) | |
44 | omap_sram_size = 0x30000; /* 192K */ | |
45 | else if (cpu_is_omap1610() || cpu_is_omap1611() || | |
46 | cpu_is_omap1621() || cpu_is_omap1710()) | |
47 | omap_sram_size = 0x4000; /* 16K */ | |
48 | else { | |
49 | pr_err("Could not detect SRAM size\n"); | |
50 | omap_sram_size = 0x4000; | |
51 | } | |
52 | ||
53 | omap_map_sram(omap_sram_start, omap_sram_size, | |
54 | omap_sram_skip, 1); | |
55 | } | |
56 | ||
57 | static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl); | |
58 | ||
59 | void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl) | |
60 | { | |
61 | BUG_ON(!_omap_sram_reprogram_clock); | |
62 | /* On 730, bit 13 must always be 1 */ | |
63 | if (cpu_is_omap7xx()) | |
64 | ckctl |= 0x2000; | |
65 | _omap_sram_reprogram_clock(dpllctl, ckctl); | |
66 | } | |
67 | ||
68 | int __init omap_sram_init(void) | |
69 | { | |
70 | omap_detect_and_map_sram(); | |
71 | _omap_sram_reprogram_clock = | |
72 | omap_sram_push(omap1_sram_reprogram_clock, | |
73 | omap1_sram_reprogram_clock_sz); | |
74 | ||
75 | return 0; | |
76 | } |