barebox/common/memory.c

/*
 * memory.c
 *
 * Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <common.h>
#include <memory.h>
#include <of.h>
#include <init.h>
#include <linux/ioport.h>
#include <asm-generic/memory_layout.h>
#include <asm/sections.h>
#include <malloc.h>

/*
 * Begin and End of memory area for malloc(), and current "brk"
 */
static unsigned long malloc_start;
static unsigned long malloc_end;
static unsigned long malloc_brk;

unsigned long mem_malloc_start(void)
{
	return malloc_start;
}

unsigned long mem_malloc_end(void)
{
	return malloc_end;
}

#ifdef CONFIG_MALLOC_TLSF
#include <tlsf.h>
tlsf_pool tlsf_mem_pool;
#endif

void mem_malloc_init(void *start, void *end)
{
	malloc_start = (unsigned long)start;
	malloc_end = (unsigned long)end;
	malloc_brk = malloc_start;
#ifdef CONFIG_MALLOC_TLSF
	tlsf_mem_pool = tlsf_create(start, end - start + 1);
#endif
}

#ifndef __SANDBOX__
static int mem_malloc_resource(void)
{
	/*
	 * Normally it's a bug when one of these fails,
	 * but we have some setups where some of these
	 * regions are outside of sdram in which case
	 * the following fails.
	 */
	request_sdram_region("malloc space",
			malloc_start,
			malloc_end - malloc_start + 1);
	request_sdram_region("barebox",
			(unsigned long)&_stext,
			(unsigned long)&_etext -
			(unsigned long)&_stext);
	request_sdram_region("barebox data",
			(unsigned long)&_sdata,
			(unsigned long)&_edata -
			(unsigned long)&_sdata);
	request_sdram_region("bss",
			(unsigned long)&__bss_start,
			(unsigned long)&__bss_stop -
			(unsigned long)&__bss_start);
#ifdef STACK_BASE
	request_sdram_region("stack", STACK_BASE, STACK_SIZE);
#endif
	return 0;
}
coredevice_initcall(mem_malloc_resource);
#endif

static void *sbrk_no_zero(ptrdiff_t increment)
{
	unsigned long old = malloc_brk;
	unsigned long new = old + increment;

	if ((new < malloc_start) || (new > malloc_end))
		return NULL;

	malloc_brk = new;

	return (void *)old;
}

void *sbrk(ptrdiff_t increment)
{
	void *old = sbrk_no_zero(increment);

	/* Only clear increment, if valid address was returned */
	if (old != NULL)
		memset(old, 0, increment);

	return old;
}

LIST_HEAD(memory_banks);

int barebox_add_memory_bank(const char *name, resource_size_t start,
				    resource_size_t size)
{
	struct memory_bank *bank = xzalloc(sizeof(*bank));
	struct device_d *dev;

	bank->res = request_iomem_region(name, start, start + size - 1);
	if (!bank->res)
		return -EBUSY;

	dev = add_mem_device(name, start, size, IORESOURCE_MEM_WRITEABLE);

	bank->dev = dev;
	bank->start = start;
	bank->size = size;

	list_add_tail(&bank->list, &memory_banks);

	return 0;
}

/*
 * Request a region from the registered sdram
 */
struct resource *request_sdram_region(const char *name, resource_size_t start,
		resource_size_t size)
{
	struct memory_bank *bank;

	for_each_memory_bank(bank) {
		struct resource *res;

		res = __request_region(bank->res, name, start,
				       start + size - 1);
		if (res)
			return res;
	}

	return NULL;
}

int release_sdram_region(struct resource *res)
{
	return release_region(res);
}

#ifdef CONFIG_OFTREE

static int of_memory_fixup(struct device_node *node, void *unused)
{
	struct memory_bank *bank;
	int err;
	int addr_cell_len, size_cell_len, len = 0;
	struct device_node *memnode;
	u8 tmp[16 * 16]; /* Up to 64-bit address + 64-bit size */

	memnode = of_create_node(node, "/memory");
	if (!memnode)
		return -ENOMEM;

	err = of_set_property(memnode, "device_type", "memory", sizeof("memory"), 1);
	if (err)
		return err;

	addr_cell_len = of_n_addr_cells(memnode);
	size_cell_len = of_n_size_cells(memnode);

	for_each_memory_bank(bank) {
		of_write_number(tmp + len, bank->start, addr_cell_len);
		len += addr_cell_len * 4;
		of_write_number(tmp + len, bank->size, size_cell_len);
		len += size_cell_len * 4;
	}

	err = of_set_property(memnode, "reg", tmp, len, 1);
	if (err) {
		pr_err("could not set reg %s.\n", strerror(-err));
		return err;
	}

	return 0;
}

static int of_register_memory_fixup(void)
{
	return of_register_fixup(of_memory_fixup, NULL);
}
late_initcall(of_register_memory_fixup);
#endif