drivers/misc/fsl_law.c

/*
 * Copyright 2008-2011 Freescale Semiconductor, Inc.
 *
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * 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 as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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 <common.h>
#include <linux/compiler.h>
#include <asm/fsl_law.h>
#include <asm/io.h>

DECLARE_GLOBAL_DATA_PTR;

#define FSL_HW_NUM_LAWS CONFIG_SYS_FSL_NUM_LAWS

#ifdef CONFIG_FSL_CORENET
#define LAW_BASE (CONFIG_SYS_FSL_CORENET_CCM_ADDR)
#define LAWAR_ADDR(x) (&((ccsr_local_t *)LAW_BASE)->law[x].lawar)
#define LAWBARH_ADDR(x) (&((ccsr_local_t *)LAW_BASE)->law[x].lawbarh)
#define LAWBARL_ADDR(x) (&((ccsr_local_t *)LAW_BASE)->law[x].lawbarl)
#define LAWBAR_SHIFT 0
#else
#define LAW_BASE (CONFIG_SYS_IMMR + 0xc08)
#define LAWAR_ADDR(x) ((u32 *)LAW_BASE + 8 * x + 2)
#define LAWBAR_ADDR(x) ((u32 *)LAW_BASE + 8 * x)
#define LAWBAR_SHIFT 12
#endif


static inline phys_addr_t get_law_base_addr(int idx)
{
#ifdef CONFIG_FSL_CORENET
	return (phys_addr_t)
		((u64)in_be32(LAWBARH_ADDR(idx)) << 32) |
		in_be32(LAWBARL_ADDR(idx));
#else
	return (phys_addr_t)in_be32(LAWBAR_ADDR(idx)) << LAWBAR_SHIFT;
#endif
}

static inline void set_law_base_addr(int idx, phys_addr_t addr)
{
#ifdef CONFIG_FSL_CORENET
	out_be32(LAWBARL_ADDR(idx), addr & 0xffffffff);
	out_be32(LAWBARH_ADDR(idx), (u64)addr >> 32);
#else
	out_be32(LAWBAR_ADDR(idx), addr >> LAWBAR_SHIFT);
#endif
}

void set_law(u8 idx, phys_addr_t addr, enum law_size sz, enum law_trgt_if id)
{
	gd->used_laws |= (1 << idx);

	out_be32(LAWAR_ADDR(idx), 0);
	set_law_base_addr(idx, addr);
	out_be32(LAWAR_ADDR(idx), LAW_EN | ((u32)id << 20) | (u32)sz);

	/* Read back so that we sync the writes */
	in_be32(LAWAR_ADDR(idx));
}

void disable_law(u8 idx)
{
	gd->used_laws &= ~(1 << idx);

	out_be32(LAWAR_ADDR(idx), 0);
	set_law_base_addr(idx, 0);

	/* Read back so that we sync the writes */
	in_be32(LAWAR_ADDR(idx));

	return;
}

#ifndef CONFIG_NAND_SPL
static int get_law_entry(u8 i, struct law_entry *e)
{
	u32 lawar;

	lawar = in_be32(LAWAR_ADDR(i));

	if (!(lawar & LAW_EN))
		return 0;

	e->addr = get_law_base_addr(i);
	e->size = lawar & 0x3f;
	e->trgt_id = (lawar >> 20) & 0xff;

	return 1;
}
#endif

int set_next_law(phys_addr_t addr, enum law_size sz, enum law_trgt_if id)
{
	u32 idx = ffz(gd->used_laws);

	if (idx >= FSL_HW_NUM_LAWS)
		return -1;

	set_law(idx, addr, sz, id);

	return idx;
}

#ifndef CONFIG_NAND_SPL
int set_last_law(phys_addr_t addr, enum law_size sz, enum law_trgt_if id)
{
	u32 idx;

	/* we have no LAWs free */
	if (gd->used_laws == -1)
		return -1;

	/* grab the last free law */
	idx = __ilog2(~(gd->used_laws));

	if (idx >= FSL_HW_NUM_LAWS)
		return -1;

	set_law(idx, addr, sz, id);

	return idx;
}

struct law_entry find_law(phys_addr_t addr)
{
	struct law_entry entry;
	int i;

	entry.index = -1;
	entry.addr = 0;
	entry.size = 0;
	entry.trgt_id = 0;

	for (i = 0; i < FSL_HW_NUM_LAWS; i++) {
		u64 upper;

		if (!get_law_entry(i, &entry))
			continue;

		upper = entry.addr + (2ull << entry.size);
		if ((addr >= entry.addr) && (addr < upper)) {
			entry.index = i;
			break;
		}
	}

	return entry;
}

void print_laws(void)
{
	int i;
	u32 lawar;

	printf("\nLocal Access Window Configuration\n");
	for (i = 0; i < FSL_HW_NUM_LAWS; i++) {
		lawar = in_be32(LAWAR_ADDR(i));
#ifdef CONFIG_FSL_CORENET
		printf("LAWBARH%02d: 0x%08x LAWBARL%02d: 0x%08x",
		       i, in_be32(LAWBARH_ADDR(i)),
		       i, in_be32(LAWBARL_ADDR(i)));
#else
		printf("LAWBAR%02d: 0x%08x", i, in_be32(LAWBAR_ADDR(i)));
#endif
		printf(" LAWAR%02d: 0x%08x\n", i, lawar);
		printf("\t(EN: %d TGT: 0x%02x SIZE: ",
		       (lawar & LAW_EN) ? 1 : 0, (lawar >> 20) & 0xff);
		print_size(lawar_size(lawar), ")\n");
	}

	return;
}

/* use up to 2 LAWs for DDR, used the last available LAWs */
int set_ddr_laws(u64 start, u64 sz, enum law_trgt_if id)
{
	u64 start_align, law_sz;
	int law_sz_enc;

	if (start == 0)
		start_align = 1ull << (LAW_SIZE_32G + 1);
	else
		start_align = 1ull << (ffs64(start) - 1);
	law_sz = min(start_align, sz);
	law_sz_enc = __ilog2_u64(law_sz) - 1;

	if (set_last_law(start, law_sz_enc, id) < 0)
		return -1;

	/* recalculate size based on what was actually covered by the law */
	law_sz = 1ull << __ilog2_u64(law_sz);

	/* do we still have anything to map */
	sz = sz - law_sz;
	if (sz) {
		start += law_sz;

		start_align = 1ull << (ffs64(start) - 1);
		law_sz = min(start_align, sz);
		law_sz_enc = __ilog2_u64(law_sz) - 1;

		if (set_last_law(start, law_sz_enc, id) < 0)
			return -1;
	} else {
		return 0;
	}

	/* do we still have anything to map */
	sz = sz - law_sz;
	if (sz)
		return 1;

	return 0;
}
#endif

void init_laws(void)
{
	int i;

#if FSL_HW_NUM_LAWS < 32
	gd->used_laws = ~((1 << FSL_HW_NUM_LAWS) - 1);
#elif FSL_HW_NUM_LAWS == 32
	gd->used_laws = 0;
#else
#error FSL_HW_NUM_LAWS can not be greater than 32 w/o code changes
#endif

	/*
	 * Any LAWs that were set up before we booted assume they are meant to
	 * be around and mark them used.
	 */
	for (i = 0; i < FSL_HW_NUM_LAWS; i++) {
		u32 lawar = in_be32(LAWAR_ADDR(i));

		if (lawar & LAW_EN)
			gd->used_laws |= (1 << i);
	}

#if defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
	/*
	 * in NAND boot we've already parsed the law_table and setup those LAWs
	 * so don't do it again.
	 */
	return;
#endif

	for (i = 0; i < num_law_entries; i++) {
		if (law_table[i].index == -1)
			set_next_law(law_table[i].addr, law_table[i].size,
					law_table[i].trgt_id);
		else
			set_law(law_table[i].index, law_table[i].addr,
				law_table[i].size, law_table[i].trgt_id);
	}

	return ;
}