/* * 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(sizeof(struct lpddr_private) + numvirtchips * sizeof(struct flchip), 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");