1654efc313
* Editing a bunch of drivers' thread routines in order to implement a new feature is tedious. * No matter the number of storage drivers, they share one thread. No extra threads needed for CONFIG_STORAGE_MULTI. * Each has an event callback called by the storage thread. * A default callback is provided to fake sleeping in order to trigger idle callbacks. It could also do other default processing. Changes to it will be part of driver code without editing each one. * Drivers may sleep and wake as they please as long as they give a low pulse on their storage bit to ask to go into sleep mode. Idle callback is called on its behalf and driver immediately put into sleep mode. * Drivers may indicate they are to continue receiving events in USB mode, otherwise they receve nothing until disconnect (they do receive SYS_USB_DISCONNECTED no matter what). * Rework a few things to keep the callback implementation sane and maintainable. ata.c was dreadful with all those bools; make it a state machine and easier to follow. Remove last_user_activity; it has no purpose that isn't served by keeping the disk active through last_disk_activity instead. * Even-out stack sizes partly because of a lack of a decent place to define them by driver or SoC or whatever; it doesn't seem too critical to do that anyway. Many are simply too large while at least one isn't really adequate. They may be individually overridden if necessary (figure out where). The thread uses the greatest size demanded. Newer file code is much more frugal with stack space. I barely see use crack 50% after idle callbacks (usually mid-40s). Card insert/eject doesn't demand much. * No forcing of idle callbacks. If it isn't necessary for one or more non-disk storage types, it really isn't any more necessary for disk storage. Besides, it makes the whole thing easier to implement. Change-Id: Id30c284d82a8af66e47f2cfe104c52cbd8aa7215
166 lines
3.4 KiB
C
166 lines
3.4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2008 Frank Gevaerts
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdbool.h>
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#include <string.h>
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#include "storage.h"
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#define SECTOR_SIZE 512
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#define NUM_SECTORS 16384
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static unsigned char ramdisk[SECTOR_SIZE * NUM_SECTORS];
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static long last_disk_activity = -1;
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int ramdisk_read_sectors(IF_MD(int drive,)
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unsigned long start,
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int count,
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void* buf)
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{
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#ifdef HAVE_MULTIDRIVE
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(void)drive; /* unused for now */
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#endif
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if(start+count>NUM_SECTORS)
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{
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return -1;
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}
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memcpy(buf,&ramdisk[start*SECTOR_SIZE],count*SECTOR_SIZE);
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return 0;
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}
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int ramdisk_write_sectors(IF_MD(int drive,)
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unsigned long start,
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int count,
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const void* buf)
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{
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#ifdef HAVE_MULTIDRIVE
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(void)drive; /* unused for now */
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#endif
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if(start+count>NUM_SECTORS)
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{
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return -1;
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}
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memcpy(&ramdisk[start*SECTOR_SIZE],buf,count*SECTOR_SIZE);
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return 0;
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}
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int ramdisk_init(void)
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{
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return 0;
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}
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long ramdisk_last_disk_activity(void)
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{
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return last_disk_activity;
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}
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void ramdisk_sleep(void)
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{
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}
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void ramdisk_spin(void)
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{
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}
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void ramdisk_sleepnow(void)
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{
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}
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void ramdisk_enable(bool on)
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{
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(void)on;
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}
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bool ramdisk_disk_is_active(void)
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{
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return true;
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}
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int ramdisk_soft_reset(void)
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{
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return 0;
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}
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int ramdisk_spinup_time(void)
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{
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return 0;
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}
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void ramdisk_spindown(int seconds)
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{
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(void)seconds;
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}
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#ifdef STORAGE_GET_INFO
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void ramdisk_get_info(IF_MD(int drive,) struct storage_info *info)
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{
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#ifdef HAVE_MULTIDRIVE
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(void)drive; /* unused for now */
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#endif
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/* firmware version */
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info->revision="0.00";
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/* vendor field, need better name? */
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info->vendor="Rockbox";
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/* model field, need better name? */
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info->product="Ramdisk";
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/* blocks count */
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info->num_sectors=NUM_SECTORS;
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info->sector_size=SECTOR_SIZE;
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}
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#endif
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#ifdef CONFIG_STORAGE_MULTI
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int ramdisk_num_drives(int first_drive)
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{
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/* We don't care which logical drive number(s) we have been assigned */
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(void)first_drive;
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return 1;
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}
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#endif
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#ifdef HAVE_HOTSWAP
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bool ramdisk_removable(IF_MD(int drive))
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{
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#ifdef HAVE_MULTIDRIVE
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(void)drive; /* unused for now */
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#endif
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return false;
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}
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bool ramdisk_present(IF_MD(int drive))
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{
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#ifdef HAVE_MULTIDRIVE
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(void)drive; /* unused for now */
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#endif
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return true;
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}
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#endif
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int ramdisk_event(long id, intptr_t data)
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{
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return storage_event_default_handler(id, data, last_disk_activity,
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STORAGE_RAMDISK);
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}
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