forked from mirrors/linux
fddcca5107
When map_word gets too large, we use a lot of kernel stack, and for
MTD_MAP_BANK_WIDTH_32, this means we use more than the recommended
1024 bytes in a number of functions:
drivers/mtd/chips/cfi_cmdset_0020.c: In function 'cfi_staa_write_buffers':
drivers/mtd/chips/cfi_cmdset_0020.c:651:1: warning: the frame size of 1336 bytes is larger than 1024 bytes [-Wframe-larger-than=]
drivers/mtd/chips/cfi_cmdset_0020.c: In function 'cfi_staa_erase_varsize':
drivers/mtd/chips/cfi_cmdset_0020.c:972:1: warning: the frame size of 1208 bytes is larger than 1024 bytes [-Wframe-larger-than=]
drivers/mtd/chips/cfi_cmdset_0001.c: In function 'do_write_buffer':
drivers/mtd/chips/cfi_cmdset_0001.c:1835:1: warning: the frame size of 1240 bytes is larger than 1024 bytes [-Wframe-larger-than=]
This can be avoided if all operations on the map word are done
indirectly and the stack gets reused between the calls. We can
mostly achieve this by selecting MTD_COMPLEX_MAPPINGS whenever
MTD_MAP_BANK_WIDTH_32 is set, but for the case that no other
bank width is enabled, we also need to use a non-constant
map_bankwidth() to convince the compiler to use less stack.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[Brian: this patch mostly achieves its goal by forcing
MTD_COMPLEX_MAPPINGS (and the accompanying indirection) for 256-bit
mappings; the rest of the change is mostly a wash, though it helps
reduce stack size slightly. If we really care about supporting
256-bit mappings though, we should consider rewriting some of this
code to avoid keeping and assigning so many 256-bit objects on the
stack.]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
486 lines
13 KiB
C
486 lines
13 KiB
C
/*
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* Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org> et al.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/* Overhauled routines for dealing with different mmap regions of flash */
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#ifndef __LINUX_MTD_MAP_H__
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#define __LINUX_MTD_MAP_H__
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/string.h>
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#include <linux/bug.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <asm/unaligned.h>
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#include <asm/barrier.h>
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#ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
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#define map_bankwidth(map) 1
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#define map_bankwidth_is_1(map) (map_bankwidth(map) == 1)
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#define map_bankwidth_is_large(map) (0)
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#define map_words(map) (1)
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#define MAX_MAP_BANKWIDTH 1
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#else
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#define map_bankwidth_is_1(map) (0)
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#endif
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#ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
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# ifdef map_bankwidth
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# undef map_bankwidth
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# define map_bankwidth(map) ((map)->bankwidth)
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# else
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# define map_bankwidth(map) 2
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# define map_bankwidth_is_large(map) (0)
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# define map_words(map) (1)
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# endif
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#define map_bankwidth_is_2(map) (map_bankwidth(map) == 2)
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#undef MAX_MAP_BANKWIDTH
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#define MAX_MAP_BANKWIDTH 2
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#else
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#define map_bankwidth_is_2(map) (0)
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#endif
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#ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
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# ifdef map_bankwidth
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# undef map_bankwidth
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# define map_bankwidth(map) ((map)->bankwidth)
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# else
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# define map_bankwidth(map) 4
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# define map_bankwidth_is_large(map) (0)
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# define map_words(map) (1)
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# endif
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#define map_bankwidth_is_4(map) (map_bankwidth(map) == 4)
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#undef MAX_MAP_BANKWIDTH
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#define MAX_MAP_BANKWIDTH 4
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#else
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#define map_bankwidth_is_4(map) (0)
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#endif
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/* ensure we never evaluate anything shorted than an unsigned long
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* to zero, and ensure we'll never miss the end of an comparison (bjd) */
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#define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1)) / sizeof(unsigned long))
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#ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
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# ifdef map_bankwidth
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# undef map_bankwidth
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# define map_bankwidth(map) ((map)->bankwidth)
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# if BITS_PER_LONG < 64
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# undef map_bankwidth_is_large
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# define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
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# undef map_words
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# define map_words(map) map_calc_words(map)
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# endif
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# else
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# define map_bankwidth(map) 8
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# define map_bankwidth_is_large(map) (BITS_PER_LONG < 64)
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# define map_words(map) map_calc_words(map)
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# endif
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#define map_bankwidth_is_8(map) (map_bankwidth(map) == 8)
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#undef MAX_MAP_BANKWIDTH
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#define MAX_MAP_BANKWIDTH 8
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#else
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#define map_bankwidth_is_8(map) (0)
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#endif
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#ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
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# ifdef map_bankwidth
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# undef map_bankwidth
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# define map_bankwidth(map) ((map)->bankwidth)
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# undef map_bankwidth_is_large
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# define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
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# undef map_words
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# define map_words(map) map_calc_words(map)
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# else
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# define map_bankwidth(map) 16
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# define map_bankwidth_is_large(map) (1)
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# define map_words(map) map_calc_words(map)
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# endif
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#define map_bankwidth_is_16(map) (map_bankwidth(map) == 16)
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#undef MAX_MAP_BANKWIDTH
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#define MAX_MAP_BANKWIDTH 16
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#else
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#define map_bankwidth_is_16(map) (0)
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#endif
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#ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
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/* always use indirect access for 256-bit to preserve kernel stack */
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# undef map_bankwidth
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# define map_bankwidth(map) ((map)->bankwidth)
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# undef map_bankwidth_is_large
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# define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
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# undef map_words
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# define map_words(map) map_calc_words(map)
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#define map_bankwidth_is_32(map) (map_bankwidth(map) == 32)
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#undef MAX_MAP_BANKWIDTH
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#define MAX_MAP_BANKWIDTH 32
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#else
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#define map_bankwidth_is_32(map) (0)
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#endif
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#ifndef map_bankwidth
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#ifdef CONFIG_MTD
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#warning "No CONFIG_MTD_MAP_BANK_WIDTH_xx selected. No NOR chip support can work"
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#endif
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static inline int map_bankwidth(void *map)
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{
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BUG();
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return 0;
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}
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#define map_bankwidth_is_large(map) (0)
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#define map_words(map) (0)
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#define MAX_MAP_BANKWIDTH 1
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#endif
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static inline int map_bankwidth_supported(int w)
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{
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switch (w) {
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#ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
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case 1:
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#endif
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#ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
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case 2:
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#endif
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#ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
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case 4:
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#endif
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#ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
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case 8:
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#endif
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#ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
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case 16:
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#endif
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#ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
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case 32:
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#endif
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return 1;
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default:
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return 0;
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}
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}
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#define MAX_MAP_LONGS (((MAX_MAP_BANKWIDTH * 8) + BITS_PER_LONG - 1) / BITS_PER_LONG)
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typedef union {
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unsigned long x[MAX_MAP_LONGS];
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} map_word;
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/* The map stuff is very simple. You fill in your struct map_info with
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a handful of routines for accessing the device, making sure they handle
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paging etc. correctly if your device needs it. Then you pass it off
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to a chip probe routine -- either JEDEC or CFI probe or both -- via
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do_map_probe(). If a chip is recognised, the probe code will invoke the
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appropriate chip driver (if present) and return a struct mtd_info.
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At which point, you fill in the mtd->module with your own module
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address, and register it with the MTD core code. Or you could partition
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it and register the partitions instead, or keep it for your own private
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use; whatever.
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The mtd->priv field will point to the struct map_info, and any further
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private data required by the chip driver is linked from the
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mtd->priv->fldrv_priv field. This allows the map driver to get at
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the destructor function map->fldrv_destroy() when it's tired
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of living.
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*/
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struct map_info {
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const char *name;
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unsigned long size;
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resource_size_t phys;
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#define NO_XIP (-1UL)
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void __iomem *virt;
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void *cached;
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int swap; /* this mapping's byte-swapping requirement */
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int bankwidth; /* in octets. This isn't necessarily the width
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of actual bus cycles -- it's the repeat interval
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in bytes, before you are talking to the first chip again.
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*/
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#ifdef CONFIG_MTD_COMPLEX_MAPPINGS
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map_word (*read)(struct map_info *, unsigned long);
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void (*copy_from)(struct map_info *, void *, unsigned long, ssize_t);
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void (*write)(struct map_info *, const map_word, unsigned long);
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void (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t);
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/* We can perhaps put in 'point' and 'unpoint' methods, if we really
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want to enable XIP for non-linear mappings. Not yet though. */
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#endif
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/* It's possible for the map driver to use cached memory in its
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copy_from implementation (and _only_ with copy_from). However,
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when the chip driver knows some flash area has changed contents,
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it will signal it to the map driver through this routine to let
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the map driver invalidate the corresponding cache as needed.
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If there is no cache to care about this can be set to NULL. */
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void (*inval_cache)(struct map_info *, unsigned long, ssize_t);
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/* This will be called with 1 as parameter when the first map user
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* needs VPP, and called with 0 when the last user exits. The map
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* core maintains a reference counter, and assumes that VPP is a
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* global resource applying to all mapped flash chips on the system.
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*/
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void (*set_vpp)(struct map_info *, int);
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unsigned long pfow_base;
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unsigned long map_priv_1;
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unsigned long map_priv_2;
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struct device_node *device_node;
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void *fldrv_priv;
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struct mtd_chip_driver *fldrv;
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};
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struct mtd_chip_driver {
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struct mtd_info *(*probe)(struct map_info *map);
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void (*destroy)(struct mtd_info *);
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struct module *module;
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char *name;
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struct list_head list;
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};
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void register_mtd_chip_driver(struct mtd_chip_driver *);
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void unregister_mtd_chip_driver(struct mtd_chip_driver *);
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struct mtd_info *do_map_probe(const char *name, struct map_info *map);
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void map_destroy(struct mtd_info *mtd);
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#define ENABLE_VPP(map) do { if (map->set_vpp) map->set_vpp(map, 1); } while (0)
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#define DISABLE_VPP(map) do { if (map->set_vpp) map->set_vpp(map, 0); } while (0)
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#define INVALIDATE_CACHED_RANGE(map, from, size) \
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do { if (map->inval_cache) map->inval_cache(map, from, size); } while (0)
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static inline int map_word_equal(struct map_info *map, map_word val1, map_word val2)
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{
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int i;
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for (i = 0; i < map_words(map); i++) {
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if (val1.x[i] != val2.x[i])
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return 0;
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}
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return 1;
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}
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static inline map_word map_word_and(struct map_info *map, map_word val1, map_word val2)
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{
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map_word r;
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int i;
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for (i = 0; i < map_words(map); i++)
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r.x[i] = val1.x[i] & val2.x[i];
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return r;
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}
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static inline map_word map_word_clr(struct map_info *map, map_word val1, map_word val2)
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{
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map_word r;
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int i;
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for (i = 0; i < map_words(map); i++)
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r.x[i] = val1.x[i] & ~val2.x[i];
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return r;
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}
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static inline map_word map_word_or(struct map_info *map, map_word val1, map_word val2)
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{
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map_word r;
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int i;
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for (i = 0; i < map_words(map); i++)
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r.x[i] = val1.x[i] | val2.x[i];
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return r;
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}
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static inline int map_word_andequal(struct map_info *map, map_word val1, map_word val2, map_word val3)
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{
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int i;
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for (i = 0; i < map_words(map); i++) {
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if ((val1.x[i] & val2.x[i]) != val3.x[i])
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return 0;
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}
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return 1;
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}
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static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word val2)
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{
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int i;
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for (i = 0; i < map_words(map); i++) {
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if (val1.x[i] & val2.x[i])
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return 1;
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}
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return 0;
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}
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static inline map_word map_word_load(struct map_info *map, const void *ptr)
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{
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map_word r;
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if (map_bankwidth_is_1(map))
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r.x[0] = *(unsigned char *)ptr;
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else if (map_bankwidth_is_2(map))
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r.x[0] = get_unaligned((uint16_t *)ptr);
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else if (map_bankwidth_is_4(map))
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r.x[0] = get_unaligned((uint32_t *)ptr);
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#if BITS_PER_LONG >= 64
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else if (map_bankwidth_is_8(map))
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r.x[0] = get_unaligned((uint64_t *)ptr);
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#endif
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else if (map_bankwidth_is_large(map))
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memcpy(r.x, ptr, map->bankwidth);
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else
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BUG();
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return r;
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}
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static inline map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len)
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{
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int i;
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if (map_bankwidth_is_large(map)) {
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char *dest = (char *)&orig;
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memcpy(dest+start, buf, len);
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} else {
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for (i = start; i < start+len; i++) {
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int bitpos;
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#ifdef __LITTLE_ENDIAN
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bitpos = i * 8;
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#else /* __BIG_ENDIAN */
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bitpos = (map_bankwidth(map) - 1 - i) * 8;
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#endif
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orig.x[0] &= ~(0xff << bitpos);
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orig.x[0] |= (unsigned long)buf[i-start] << bitpos;
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}
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}
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return orig;
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}
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#if BITS_PER_LONG < 64
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#define MAP_FF_LIMIT 4
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#else
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#define MAP_FF_LIMIT 8
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#endif
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static inline map_word map_word_ff(struct map_info *map)
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{
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map_word r;
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int i;
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if (map_bankwidth(map) < MAP_FF_LIMIT) {
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int bw = 8 * map_bankwidth(map);
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r.x[0] = (1UL << bw) - 1;
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} else {
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for (i = 0; i < map_words(map); i++)
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r.x[i] = ~0UL;
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}
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return r;
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}
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static inline map_word inline_map_read(struct map_info *map, unsigned long ofs)
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{
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map_word r;
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if (map_bankwidth_is_1(map))
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r.x[0] = __raw_readb(map->virt + ofs);
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else if (map_bankwidth_is_2(map))
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r.x[0] = __raw_readw(map->virt + ofs);
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else if (map_bankwidth_is_4(map))
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r.x[0] = __raw_readl(map->virt + ofs);
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#if BITS_PER_LONG >= 64
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else if (map_bankwidth_is_8(map))
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r.x[0] = __raw_readq(map->virt + ofs);
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#endif
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else if (map_bankwidth_is_large(map))
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memcpy_fromio(r.x, map->virt + ofs, map->bankwidth);
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else
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BUG();
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return r;
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}
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static inline void inline_map_write(struct map_info *map, const map_word datum, unsigned long ofs)
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{
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if (map_bankwidth_is_1(map))
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__raw_writeb(datum.x[0], map->virt + ofs);
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else if (map_bankwidth_is_2(map))
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__raw_writew(datum.x[0], map->virt + ofs);
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else if (map_bankwidth_is_4(map))
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__raw_writel(datum.x[0], map->virt + ofs);
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#if BITS_PER_LONG >= 64
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else if (map_bankwidth_is_8(map))
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__raw_writeq(datum.x[0], map->virt + ofs);
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#endif
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else if (map_bankwidth_is_large(map))
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memcpy_toio(map->virt+ofs, datum.x, map->bankwidth);
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else
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BUG();
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mb();
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}
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static inline void inline_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
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{
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if (map->cached)
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memcpy(to, (char *)map->cached + from, len);
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else
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memcpy_fromio(to, map->virt + from, len);
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}
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|
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|
static inline void inline_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
|
|
{
|
|
memcpy_toio(map->virt + to, from, len);
|
|
}
|
|
|
|
#ifdef CONFIG_MTD_COMPLEX_MAPPINGS
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|
#define map_read(map, ofs) (map)->read(map, ofs)
|
|
#define map_copy_from(map, to, from, len) (map)->copy_from(map, to, from, len)
|
|
#define map_write(map, datum, ofs) (map)->write(map, datum, ofs)
|
|
#define map_copy_to(map, to, from, len) (map)->copy_to(map, to, from, len)
|
|
|
|
extern void simple_map_init(struct map_info *);
|
|
#define map_is_linear(map) (map->phys != NO_XIP)
|
|
|
|
#else
|
|
#define map_read(map, ofs) inline_map_read(map, ofs)
|
|
#define map_copy_from(map, to, from, len) inline_map_copy_from(map, to, from, len)
|
|
#define map_write(map, datum, ofs) inline_map_write(map, datum, ofs)
|
|
#define map_copy_to(map, to, from, len) inline_map_copy_to(map, to, from, len)
|
|
|
|
|
|
#define simple_map_init(map) BUG_ON(!map_bankwidth_supported((map)->bankwidth))
|
|
#define map_is_linear(map) ({ (void)(map); 1; })
|
|
|
|
#endif /* !CONFIG_MTD_COMPLEX_MAPPINGS */
|
|
|
|
#endif /* __LINUX_MTD_MAP_H__ */
|