mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-16 14:02:10 +00:00
9fe133b149
Patch from Deepak Saxena OMAP map_desc.pfn conversion Signed-off-by: Deepak Saxena <dsaxena@plexity.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/*
|
|
* linux/arch/arm/plat-omap/sram.c
|
|
*
|
|
* OMAP SRAM detection and management
|
|
*
|
|
* Copyright (C) 2005 Nokia Corporation
|
|
* Written by Tony Lindgren <tony@atomide.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/mach/map.h>
|
|
#include <asm/io.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
#include "sram.h"
|
|
|
|
#define OMAP1_SRAM_BASE 0xd0000000
|
|
#define OMAP1_SRAM_START 0x20000000
|
|
#define SRAM_BOOTLOADER_SZ 0x80
|
|
|
|
static unsigned long omap_sram_base;
|
|
static unsigned long omap_sram_size;
|
|
static unsigned long omap_sram_ceil;
|
|
|
|
/*
|
|
* The amount of SRAM depends on the core type:
|
|
* 730 = 200K, 1510 = 512K, 5912 = 256K, 1610 = 16K, 1710 = 16K
|
|
* Note that we cannot try to test for SRAM here because writes
|
|
* to secure SRAM will hang the system. Also the SRAM is not
|
|
* yet mapped at this point.
|
|
*/
|
|
void __init omap_detect_sram(void)
|
|
{
|
|
omap_sram_base = OMAP1_SRAM_BASE;
|
|
|
|
if (cpu_is_omap730())
|
|
omap_sram_size = 0x32000;
|
|
else if (cpu_is_omap1510())
|
|
omap_sram_size = 0x80000;
|
|
else if (cpu_is_omap1610() || cpu_is_omap1621() || cpu_is_omap1710())
|
|
omap_sram_size = 0x4000;
|
|
else if (cpu_is_omap1611())
|
|
omap_sram_size = 0x3e800;
|
|
else {
|
|
printk(KERN_ERR "Could not detect SRAM size\n");
|
|
omap_sram_size = 0x4000;
|
|
}
|
|
|
|
printk(KERN_INFO "SRAM size: 0x%lx\n", omap_sram_size);
|
|
omap_sram_ceil = omap_sram_base + omap_sram_size;
|
|
}
|
|
|
|
static struct map_desc omap_sram_io_desc[] __initdata = {
|
|
{ /* .length gets filled in at runtime */
|
|
.virtual = OMAP1_SRAM_BASE,
|
|
.pfn = __phys_to_pfn(OMAP1_SRAM_START),
|
|
.type = MT_DEVICE
|
|
}
|
|
};
|
|
|
|
/*
|
|
* In order to use last 2kB of SRAM on 1611b, we must round the size
|
|
* up to multiple of PAGE_SIZE. We cannot use ioremap for SRAM, as
|
|
* clock init needs SRAM early.
|
|
*/
|
|
void __init omap_map_sram(void)
|
|
{
|
|
if (omap_sram_size == 0)
|
|
return;
|
|
|
|
omap_sram_io_desc[0].length = (omap_sram_size + PAGE_SIZE-1)/PAGE_SIZE;
|
|
omap_sram_io_desc[0].length *= PAGE_SIZE;
|
|
iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
|
|
|
|
/*
|
|
* Looks like we need to preserve some bootloader code at the
|
|
* beginning of SRAM for jumping to flash for reboot to work...
|
|
*/
|
|
memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
|
|
omap_sram_size - SRAM_BOOTLOADER_SZ);
|
|
}
|
|
|
|
static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl) = NULL;
|
|
|
|
void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
|
|
{
|
|
if (_omap_sram_reprogram_clock == NULL)
|
|
panic("Cannot use SRAM");
|
|
|
|
return _omap_sram_reprogram_clock(dpllctl, ckctl);
|
|
}
|
|
|
|
void * omap_sram_push(void * start, unsigned long size)
|
|
{
|
|
if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
|
|
printk(KERN_ERR "Not enough space in SRAM\n");
|
|
return NULL;
|
|
}
|
|
omap_sram_ceil -= size;
|
|
omap_sram_ceil &= ~0x3;
|
|
memcpy((void *)omap_sram_ceil, start, size);
|
|
|
|
return (void *)omap_sram_ceil;
|
|
}
|
|
|
|
void __init omap_sram_init(void)
|
|
{
|
|
omap_detect_sram();
|
|
omap_map_sram();
|
|
_omap_sram_reprogram_clock = omap_sram_push(sram_reprogram_clock,
|
|
sram_reprogram_clock_sz);
|
|
}
|