396 lines
8.8 KiB
C
396 lines
8.8 KiB
C
/*
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* (C) Copyright 2007-2008 Semihalf
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*
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* Written by: Rafal Jaworowski <raj@semihalf.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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 as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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#include <config.h>
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#if defined(CONFIG_API)
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#include <common.h>
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#include <api_public.h>
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#if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
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#include <usb.h>
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#endif
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#define DEBUG
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#undef DEBUG
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#ifdef DEBUG
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#define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0)
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#else
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#define debugf(fmt, args...)
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#endif
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#define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0)
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#define ENUM_IDE 0
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#define ENUM_USB 1
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#define ENUM_SCSI 2
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#define ENUM_MMC 3
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#define ENUM_SATA 4
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#define ENUM_MAX 5
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struct stor_spec {
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int max_dev;
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int enum_started;
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int enum_ended;
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int type; /* "external" type: DT_STOR_{IDE,USB,etc} */
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char *name;
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};
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static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, "" }, };
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void dev_stor_init(void)
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{
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#if defined(CONFIG_CMD_IDE)
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specs[ENUM_IDE].max_dev = CONFIG_SYS_IDE_MAXDEVICE;
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specs[ENUM_IDE].enum_started = 0;
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specs[ENUM_IDE].enum_ended = 0;
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specs[ENUM_IDE].type = DEV_TYP_STOR | DT_STOR_IDE;
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specs[ENUM_IDE].name = "ide";
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#endif
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#if defined(CONFIG_CMD_MMC)
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specs[ENUM_MMC].max_dev = CONFIG_SYS_MMC_MAX_DEVICE;
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specs[ENUM_MMC].enum_started = 0;
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specs[ENUM_MMC].enum_ended = 0;
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specs[ENUM_MMC].type = DEV_TYP_STOR | DT_STOR_MMC;
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specs[ENUM_MMC].name = "mmc";
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#endif
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#if defined(CONFIG_CMD_SATA)
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specs[ENUM_SATA].max_dev = CONFIG_SYS_SATA_MAX_DEVICE;
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specs[ENUM_SATA].enum_started = 0;
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specs[ENUM_SATA].enum_ended = 0;
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specs[ENUM_SATA].type = DEV_TYP_STOR | DT_STOR_SATA;
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specs[ENUM_SATA].name = "sata";
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#endif
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#if defined(CONFIG_CMD_SCSI)
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specs[ENUM_SCSI].max_dev = CONFIG_SYS_SCSI_MAX_DEVICE;
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specs[ENUM_SCSI].enum_started = 0;
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specs[ENUM_SCSI].enum_ended = 0;
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specs[ENUM_SCSI].type = DEV_TYP_STOR | DT_STOR_SCSI;
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specs[ENUM_SCSI].name = "scsi";
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#endif
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#if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
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specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV;
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specs[ENUM_USB].enum_started = 0;
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specs[ENUM_USB].enum_ended = 0;
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specs[ENUM_USB].type = DEV_TYP_STOR | DT_STOR_USB;
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specs[ENUM_USB].name = "usb";
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#endif
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}
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/*
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* Finds next available device in the storage group
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*
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* type: storage group type - ENUM_IDE, ENUM_SCSI etc.
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*
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* first: if 1 the first device in the storage group is returned (if
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* exists), if 0 the next available device is searched
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*
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* more: returns 0/1 depending if there are more devices in this group
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* available (for future iterations)
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*
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* returns: 0/1 depending if device found in this iteration
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*/
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static int dev_stor_get(int type, int first, int *more, struct device_info *di)
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{
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int found = 0;
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*more = 0;
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int i;
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block_dev_desc_t *dd;
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if (first) {
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di->cookie = (void *)get_dev(specs[type].name, 0);
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if (di->cookie == NULL)
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return 0;
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else
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found = 1;
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} else {
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for (i = 0; i < specs[type].max_dev; i++)
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if (di->cookie == (void *)get_dev(specs[type].name, i)) {
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/* previous cookie found -- advance to the
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* next device, if possible */
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if (++i >= specs[type].max_dev) {
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/* out of range, no more to enum */
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di->cookie = NULL;
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break;
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}
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di->cookie = (void *)get_dev(specs[type].name, i);
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if (di->cookie == NULL)
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return 0;
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else
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found = 1;
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/* provide hint if there are more devices in
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* this group to enumerate */
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if ((i + 1) < specs[type].max_dev)
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*more = 1;
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break;
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}
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}
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if (found) {
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di->type = specs[type].type;
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if (di->cookie != NULL) {
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dd = (block_dev_desc_t *)di->cookie;
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if (dd->type == DEV_TYPE_UNKNOWN) {
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debugf("device instance exists, but is not active..");
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found = 0;
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} else {
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di->di_stor.block_count = dd->lba;
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di->di_stor.block_size = dd->blksz;
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}
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}
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} else
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di->cookie = NULL;
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return found;
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}
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/*
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* returns: ENUM_IDE, ENUM_USB etc. based on block_dev_desc_t
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*/
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static int dev_stor_type(block_dev_desc_t *dd)
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{
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int i, j;
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for (i = ENUM_IDE; i < ENUM_MAX; i++)
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for (j = 0; j < specs[i].max_dev; j++)
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if (dd == get_dev(specs[i].name, j))
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return i;
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return ENUM_MAX;
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}
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/*
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* returns: 0/1 whether cookie points to some device in this group
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*/
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static int dev_is_stor(int type, struct device_info *di)
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{
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return (dev_stor_type(di->cookie) == type) ? 1 : 0;
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}
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static int dev_enum_stor(int type, struct device_info *di)
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{
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int found = 0, more = 0;
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debugf("called, type %d\n", type);
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/*
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* Formulae for enumerating storage devices:
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* 1. if cookie (hint from previous enum call) is NULL we start again
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* with enumeration, so return the first available device, done.
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*
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* 2. if cookie is not NULL, check if it identifies some device in
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* this group:
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*
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* 2a. if cookie is a storage device from our group (IDE, USB etc.),
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* return next available (if exists) in this group
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*
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* 2b. if it isn't device from our group, check if such devices were
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* ever enumerated before:
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* - if not, return the first available device from this group
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* - else return 0
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*/
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if (di->cookie == NULL) {
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debugf("group%d - enum restart\n", type);
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/*
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* 1. Enumeration (re-)started: take the first available
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* device, if exists
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*/
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found = dev_stor_get(type, 1, &more, di);
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specs[type].enum_started = 1;
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} else if (dev_is_stor(type, di)) {
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debugf("group%d - enum continued for the next device\n", type);
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if (specs[type].enum_ended) {
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debugf("group%d - nothing more to enum!\n", type);
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return 0;
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}
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/* 2a. Attempt to take a next available device in the group */
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found = dev_stor_get(type, 0, &more, di);
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} else {
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if (specs[type].enum_ended) {
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debugf("group %d - already enumerated, skipping\n", type);
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return 0;
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}
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debugf("group%d - first time enum\n", type);
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if (specs[type].enum_started == 0) {
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/*
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* 2b. If enumerating devices in this group did not
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* happen before, it means the cookie pointed to a
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* device frome some other group (another storage
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* group, or network); in this case try to take the
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* first available device from our group
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*/
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specs[type].enum_started = 1;
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/*
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* Attempt to take the first device in this group:
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*'first element' flag is set
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*/
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found = dev_stor_get(type, 1, &more, di);
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} else {
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errf("group%d - out of order iteration\n", type);
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found = 0;
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more = 0;
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}
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}
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/*
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* If there are no more devices in this group, consider its
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* enumeration finished
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*/
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specs[type].enum_ended = (!more) ? 1 : 0;
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if (found)
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debugf("device found, returning cookie 0x%08x\n",
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(u_int32_t)di->cookie);
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else
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debugf("no device found\n");
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return found;
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}
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void dev_enum_reset(void)
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{
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int i;
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for (i = 0; i < ENUM_MAX; i ++) {
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specs[i].enum_started = 0;
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specs[i].enum_ended = 0;
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}
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}
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int dev_enum_storage(struct device_info *di)
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{
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int i;
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/*
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* check: ide, usb, scsi, mmc
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*/
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for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
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if (dev_enum_stor(i, di))
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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 int dev_stor_is_valid(int type, block_dev_desc_t *dd)
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{
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int i;
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for (i = 0; i < specs[type].max_dev; i++)
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if (dd == get_dev(specs[type].name, i))
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if (dd->type != DEV_TYPE_UNKNOWN)
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return 1;
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return 0;
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}
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int dev_open_stor(void *cookie)
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{
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int type = dev_stor_type(cookie);
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if (type == ENUM_MAX)
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return API_ENODEV;
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if (dev_stor_is_valid(type, (block_dev_desc_t *)cookie))
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return 0;
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return API_ENODEV;
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}
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int dev_close_stor(void *cookie)
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{
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/*
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* Not much to do as we actually do not alter storage devices upon
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* close
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*/
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return 0;
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}
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static int dev_stor_index(block_dev_desc_t *dd)
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{
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int i, type;
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type = dev_stor_type(dd);
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for (i = 0; i < specs[type].max_dev; i++)
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if (dd == get_dev(specs[type].name, i))
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return i;
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return (specs[type].max_dev);
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}
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lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
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{
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int type;
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block_dev_desc_t *dd = (block_dev_desc_t *)cookie;
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if ((type = dev_stor_type(dd)) == ENUM_MAX)
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return 0;
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if (!dev_stor_is_valid(type, dd))
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return 0;
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if ((dd->block_read) == NULL) {
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debugf("no block_read() for device 0x%08x\n", cookie);
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return 0;
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}
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return (dd->block_read(dev_stor_index(dd), start, len, buf));
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}
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#endif /* CONFIG_API */
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