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df15e5cd61
This improves flash read speed on various Buffalo units.
mtd_speedtest results on the WZR-HP-AG300H:
old new delta
eraseblock read speed: 726 KiB/s 2068 KiB/s +184.85%
page read speed: 699 KiB/s 1973 KiB/s +182.26%
2 page read speed: 711 KiB/s 2043 KiB/s +187.34%
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
SVN-Revision: 35392
119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
/*
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* Copyright (C) 2009-2012 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/flash.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/concat.h>
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#include "dev-spi.h"
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#include "dev-m25p80.h"
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static struct ath79_spi_controller_data ath79_spi0_cdata =
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{
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.cs_type = ATH79_SPI_CS_TYPE_INTERNAL,
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.cs_line = 0,
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};
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static struct ath79_spi_controller_data ath79_spi1_cdata =
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{
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.cs_type = ATH79_SPI_CS_TYPE_INTERNAL,
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.cs_line = 1,
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};
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static struct spi_board_info ath79_spi_info[] = {
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{
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.bus_num = 0,
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.chip_select = 0,
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.max_speed_hz = 25000000,
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.modalias = "m25p80",
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.controller_data = &ath79_spi0_cdata,
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},
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{
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.bus_num = 0,
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.chip_select = 1,
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.max_speed_hz = 25000000,
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.modalias = "m25p80",
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.controller_data = &ath79_spi1_cdata,
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}
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};
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static struct ath79_spi_platform_data ath79_spi_data;
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void __init ath79_register_m25p80(struct flash_platform_data *pdata)
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{
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ath79_spi_data.bus_num = 0;
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ath79_spi_data.num_chipselect = 1;
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ath79_spi0_cdata.is_flash = true;
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ath79_spi_info[0].platform_data = pdata;
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ath79_register_spi(&ath79_spi_data, ath79_spi_info, 1);
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}
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static struct flash_platform_data *multi_pdata;
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static struct mtd_info *concat_devs[2] = { NULL, NULL };
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static struct work_struct mtd_concat_work;
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static void mtd_concat_add_work(struct work_struct *work)
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{
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struct mtd_info *mtd;
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mtd = mtd_concat_create(concat_devs, ARRAY_SIZE(concat_devs), "flash");
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mtd_device_register(mtd, multi_pdata->parts, multi_pdata->nr_parts);
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}
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static void mtd_concat_add(struct mtd_info *mtd)
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{
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static bool registered = false;
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if (registered)
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return;
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if (!strcmp(mtd->name, "spi0.0"))
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concat_devs[0] = mtd;
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else if (!strcmp(mtd->name, "spi0.1"))
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concat_devs[1] = mtd;
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else
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return;
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if (!concat_devs[0] || !concat_devs[1])
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return;
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registered = true;
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INIT_WORK(&mtd_concat_work, mtd_concat_add_work);
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schedule_work(&mtd_concat_work);
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}
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static void mtd_concat_remove(struct mtd_info *mtd)
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{
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}
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static void add_mtd_concat_notifier(void)
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{
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static struct mtd_notifier not = {
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.add = mtd_concat_add,
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.remove = mtd_concat_remove,
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};
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register_mtd_user(¬);
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}
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void __init ath79_register_m25p80_multi(struct flash_platform_data *pdata)
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{
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multi_pdata = pdata;
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add_mtd_concat_notifier();
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ath79_spi_data.bus_num = 0;
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ath79_spi_data.num_chipselect = 2;
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ath79_spi0_cdata.is_flash = true;
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ath79_register_spi(&ath79_spi_data, ath79_spi_info, 2);
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}
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