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/*
* Probing flash chips with QINFO records.
* (C) 2008 Korolev Alexey <akorolev@infradead.org>
* (C) 2008 Vasiliy Leonenko <vasiliy.leonenko@gmail.com>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/mtd/xip.h>
#include <linux/mtd/map.h>
#include <linux/mtd/pfow.h>
#include <linux/mtd/qinfo.h>
static int lpddr_chip_setup(struct map_info *map, struct lpddr_private *lpddr);
struct mtd_info *lpddr_probe(struct map_info *map);
static struct lpddr_private *lpddr_probe_chip(struct map_info *map);
static int lpddr_pfow_present(struct map_info *map,
struct lpddr_private *lpddr);
static struct qinfo_query_info qinfo_array[] = {
/* General device info */
{0, 0, "DevSizeShift", "Device size 2^n bytes"},
{0, 3, "BufSizeShift", "Program buffer size 2^n bytes"},
/* Erase block information */
{1, 1, "TotalBlocksNum", "Total number of blocks"},
{1, 2, "UniformBlockSizeShift", "Uniform block size 2^n bytes"},
/* Partition information */
{2, 1, "HWPartsNum", "Number of hardware partitions"},
/* Optional features */
{5, 1, "SuspEraseSupp", "Suspend erase supported"},
/* Operation typical time */
{10, 0, "SingleWordProgTime", "Single word program 2^n u-sec"},
{10, 1, "ProgBufferTime", "Program buffer write 2^n u-sec"},
{10, 2, "BlockEraseTime", "Block erase 2^n m-sec"},
{10, 3, "FullChipEraseTime", "Full chip erase 2^n m-sec"},
};
static long lpddr_get_qinforec_pos(struct map_info *map, char *id_str)
{
int qinfo_lines = ARRAY_SIZE(qinfo_array);
int i;
int bankwidth = map_bankwidth(map) * 8;
int major, minor;
for (i = 0; i < qinfo_lines; i++) {
if (strcmp(id_str, qinfo_array[i].id_str) == 0) {
major = qinfo_array[i].major & ((1 << bankwidth) - 1);
minor = qinfo_array[i].minor & ((1 << bankwidth) - 1);
return minor | (major << bankwidth);
}
}
printk(KERN_ERR"%s qinfo id string is wrong! \n", map->name);
BUG();
return -1;
}
static uint16_t lpddr_info_query(struct map_info *map, char *id_str)
{
unsigned int dsr, val;
int bits_per_chip = map_bankwidth(map) * 8;
unsigned long adr = lpddr_get_qinforec_pos(map, id_str);
int attempts = 20;
/* Write a request for the PFOW record */
map_write(map, CMD(LPDDR_INFO_QUERY),
map->pfow_base + PFOW_COMMAND_CODE);
map_write(map, CMD(adr & ((1 << bits_per_chip) - 1)),
map->pfow_base + PFOW_COMMAND_ADDRESS_L);
map_write(map, CMD(adr >> bits_per_chip),
map->pfow_base + PFOW_COMMAND_ADDRESS_H);
map_write(map, CMD(LPDDR_START_EXECUTION),
map->pfow_base + PFOW_COMMAND_EXECUTE);
while ((attempts--) > 0) {
dsr = CMDVAL(map_read(map, map->pfow_base + PFOW_DSR));
if (dsr & DSR_READY_STATUS)
break;
udelay(10);
}
val = CMDVAL(map_read(map, map->pfow_base + PFOW_COMMAND_DATA));
return val;
}
static int lpddr_pfow_present(struct map_info *map, struct lpddr_private *lpddr)
{
map_word pfow_val[4];
/* Check identification string */
pfow_val[0] = map_read(map, map->pfow_base + PFOW_QUERY_STRING_P);
pfow_val[1] = map_read(map, map->pfow_base + PFOW_QUERY_STRING_F);
pfow_val[2] = map_read(map, map->pfow_base + PFOW_QUERY_STRING_O);
pfow_val[3] = map_read(map, map->pfow_base + PFOW_QUERY_STRING_W);
if (!map_word_equal(map, CMD('P'), pfow_val[0]))
goto out;
if (!map_word_equal(map, CMD('F'), pfow_val[1]))
goto out;
if (!map_word_equal(map, CMD('O'), pfow_val[2]))
goto out;
if (!map_word_equal(map, CMD('W'), pfow_val[3]))
goto out;
return 1; /* "PFOW" is found */
out:
printk(KERN_WARNING"%s: PFOW string at 0x%lx is not found \n",
map->name, map->pfow_base);
return 0;
}
static int lpddr_chip_setup(struct map_info *map, struct lpddr_private *lpddr)
{
lpddr->qinfo = kzalloc(sizeof(struct qinfo_chip), GFP_KERNEL);
if (!lpddr->qinfo)
return 0;
/* Get the ManuID */
lpddr->ManufactId = CMDVAL(map_read(map, map->pfow_base + PFOW_MANUFACTURER_ID));
/* Get the DeviceID */
lpddr->DevId = CMDVAL(map_read(map, map->pfow_base + PFOW_DEVICE_ID));
/* read parameters from chip qinfo table */
lpddr->qinfo->DevSizeShift = lpddr_info_query(map, "DevSizeShift");
lpddr->qinfo->TotalBlocksNum = lpddr_info_query(map, "TotalBlocksNum");
lpddr->qinfo->BufSizeShift = lpddr_info_query(map, "BufSizeShift");
lpddr->qinfo->HWPartsNum = lpddr_info_query(map, "HWPartsNum");
lpddr->qinfo->UniformBlockSizeShift =
lpddr_info_query(map, "UniformBlockSizeShift");
lpddr->qinfo->SuspEraseSupp = lpddr_info_query(map, "SuspEraseSupp");
lpddr->qinfo->SingleWordProgTime =
lpddr_info_query(map, "SingleWordProgTime");
lpddr->qinfo->ProgBufferTime = lpddr_info_query(map, "ProgBufferTime");
lpddr->qinfo->BlockEraseTime = lpddr_info_query(map, "BlockEraseTime");
return 1;
}
static struct lpddr_private *lpddr_probe_chip(struct map_info *map)
{
struct lpddr_private lpddr;
struct lpddr_private *retlpddr;
int numvirtchips;
if ((map->pfow_base + 0x1000) >= map->size) {
printk(KERN_NOTICE"%s Probe at base (0x%08lx) past the end of"
"the map(0x%08lx)\n", map->name,
(unsigned long)map->pfow_base, map->size - 1);
return NULL;
}
memset(&lpddr, 0, sizeof(struct lpddr_private));
if (!lpddr_pfow_present(map, &lpddr))
return NULL;
if (!lpddr_chip_setup(map, &lpddr))
return NULL;
/* Ok so we found a chip */
lpddr.chipshift = lpddr.qinfo->DevSizeShift;
lpddr.numchips = 1;
numvirtchips = lpddr.numchips * lpddr.qinfo->HWPartsNum;
retlpddr = kzalloc(struct_size(retlpddr, chips, numvirtchips),
GFP_KERNEL);
if (!retlpddr)
return NULL;
memcpy(retlpddr, &lpddr, sizeof(struct lpddr_private));
retlpddr->numchips = numvirtchips;
retlpddr->chipshift = retlpddr->qinfo->DevSizeShift -
__ffs(retlpddr->qinfo->HWPartsNum);
return retlpddr;
}
struct mtd_info *lpddr_probe(struct map_info *map)
{
struct mtd_info *mtd = NULL;
struct lpddr_private *lpddr;
/* First probe the map to see if we havecan open PFOW here */
lpddr = lpddr_probe_chip(map);
if (!lpddr)
return NULL;
map->fldrv_priv = lpddr;
mtd = lpddr_cmdset(map);
if (mtd) {
if (mtd->size > map->size) {
printk(KERN_WARNING "Reducing visibility of %ldKiB chip"
"to %ldKiB\n", (unsigned long)mtd->size >> 10,
(unsigned long)map->size >> 10);
mtd->size = map->size;
}
return mtd;
}
kfree(lpddr->qinfo);
kfree(lpddr);
map->fldrv_priv = NULL;
return NULL;
}
static struct mtd_chip_driver lpddr_chipdrv = {
.probe = lpddr_probe,
.name = "qinfo_probe",
.module = THIS_MODULE
};
static int __init lpddr_probe_init(void)
{
register_mtd_chip_driver(&lpddr_chipdrv);
return 0;
}
static void __exit lpddr_probe_exit(void)
{
unregister_mtd_chip_driver(&lpddr_chipdrv);
}
module_init(lpddr_probe_init);
module_exit(lpddr_probe_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Vasiliy Leonenko <vasiliy.leonenko@gmail.com>");
MODULE_DESCRIPTION("Driver to probe qinfo flash chips");
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