path: root/arch/powerpc/platforms/ps3/mm.c

/*
 *  PS3 address space management.
 *
 *  Copyright (C) 2006 Sony Computer Entertainment Inc.
 *  Copyright 2006 Sony Corp.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/memory_hotplug.h>
#include <linux/lmb.h>

#include <asm/firmware.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/lv1call.h>

#include "platform.h"

#if defined(DEBUG)
#define DBG udbg_printf
#else
#define DBG pr_debug
#endif

enum {
#if defined(CONFIG_PS3_DYNAMIC_DMA)
	USE_DYNAMIC_DMA = 1,
#else
	USE_DYNAMIC_DMA = 0,
#endif
};

enum {
	PAGE_SHIFT_4K = 12U,
	PAGE_SHIFT_64K = 16U,
	PAGE_SHIFT_16M = 24U,
};

static unsigned long make_page_sizes(unsigned long a, unsigned long b)
{
	return (a << 56) | (b << 48);
}

enum {
	ALLOCATE_MEMORY_TRY_ALT_UNIT = 0X04,
	ALLOCATE_MEMORY_ADDR_ZERO = 0X08,
};

/* valid htab sizes are {18,19,20} = 256K, 512K, 1M */

enum {
	HTAB_SIZE_MAX = 20U, /* HV limit of 1MB */
	HTAB_SIZE_MIN = 18U, /* CPU limit of 256KB */
};

/*============================================================================*/
/* virtual address space routines                                             */
/*============================================================================*/

/**
 * struct mem_region - memory region structure
 * @base: base address
 * @size: size in bytes
 * @offset: difference between base and rm.size
 */

struct mem_region {
	u64 base;
	u64 size;
	unsigned long offset;
};

/**
 * struct map - address space state variables holder
 * @total: total memory available as reported by HV
 * @vas_id - HV virtual address space id
 * @htab_size: htab size in bytes
 *
 * The HV virtual address space (vas) allows for hotplug memory regions.
 * Memory regions can be created and destroyed in the vas at runtime.
 * @rm: real mode (bootmem) region
 * @r1: hotplug memory region(s)
 *
 * ps3 addresses
 * virt_addr: a cpu 'translated' effective address
 * phys_addr: an address in what Linux thinks is the physical address space
 * lpar_addr: an address in the HV virtual address space
 * bus_addr: an io controller 'translated' address on a device bus
 */

struct map {
	u64 total;
	u64 vas_id;
	u64 htab_size;
	struct mem_region rm;
	struct mem_region r1;
};

#define debug_dump_map(x) _debug_dump_map(x, __func__, __LINE__)
static void __maybe_unused _debug_dump_map(const struct map *m,
	const char *func, int line)
{
	DBG("%s:%d: map.total     = %llxh\n", func, line, m->total);
	DBG("%s:%d: map.rm.size   = %llxh\n", func, line, m->rm.size);
	DBG("%s:%d: map.vas_id    = %llu\n", func, line, m->vas_id);
	DBG("%s:%d: map.htab_size = %llxh\n", func, line, m->htab_size);
	DBG("%s:%d: map.r1.base   = %llxh\n", func, line, m->r1.base);
	DBG("%s:%d: map.r1.offset = %lxh\n", func, line, m->r1.offset);
	DBG("%s:%d: map.r1.size   = %llxh\n", func, line, m->r1.size);
}

static struct map map;

/**
 * ps3_mm_phys_to_lpar - translate a linux physical address to lpar address
 * @phys_addr: linux physical address
 */

unsigned long