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