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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/arm/plat-omap/sram.c
2 * linux/arch/arm/plat-omap/sram.c
4 * OMAP SRAM detection and management
6 * Copyright (C) 2005 Nokia Corporation
7 * Written by Tony Lindgren <tony@atomide.com>
9 * Copyright (C) 2009-2012 Texas Instruments
10 * Added OMAP4/5 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
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.
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
23 #include <asm/fncpy.h>
25 #include <asm/cacheflush.h>
27 #include <asm/mach/map.h>
29 #include <plat/sram.h>
31 #define ROUND_DOWN(value,boundary) ((value) & (~((boundary)-1)))
33 static void __iomem
*omap_sram_base
;
34 static unsigned long omap_sram_skip
;
35 static unsigned long omap_sram_size
;
36 static void __iomem
*omap_sram_ceil
;
39 * Memory allocator for SRAM: calculates the new ceiling address
40 * for pushing a function using the fncpy API.
42 * Note that fncpy requires the returned address to be aligned
43 * to an 8-byte boundary.
45 void *omap_sram_push_address(unsigned long size
)
47 unsigned long available
, new_ceil
= (unsigned long)omap_sram_ceil
;
49 available
= omap_sram_ceil
- (omap_sram_base
+ omap_sram_skip
);
51 if (size
> available
) {
52 pr_err("Not enough space in SRAM\n");
57 new_ceil
= ROUND_DOWN(new_ceil
, FNCPY_ALIGN
);
58 omap_sram_ceil
= IOMEM(new_ceil
);
60 return (void *)omap_sram_ceil
;
64 * The SRAM context is lost during off-idle and stack
67 void omap_sram_reset(void)
69 omap_sram_ceil
= omap_sram_base
+ omap_sram_size
;
73 * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
75 void __init
omap_map_sram(unsigned long start
, unsigned long size
,
76 unsigned long skip
, int cached
)
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");
93 * Looks like we need to preserve some bootloader code at the
94 * beginning of SRAM for jumping to flash for reboot to work...
96 memset_io(omap_sram_base
+ omap_sram_skip
, 0,
97 omap_sram_size
- omap_sram_skip
);