445 lines
12 KiB
C
445 lines
12 KiB
C
/*
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* drivers/mtd/devices/goldfish_nand.c
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*
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* Copyright (C) 2007 Google, Inc.
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* Copyright (C) 2012 Intel, Inc.
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* Copyright (C) 2013 Intel, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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#include <linux/io.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/vmalloc.h>
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#include <linux/mtd/mtd.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include <linux/goldfish.h>
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#include <asm/div64.h>
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#include <linux/dma-mapping.h>
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#include "goldfish_nand_reg.h"
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struct goldfish_nand {
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/* lock protects access to the device registers */
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struct mutex lock;
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unsigned char __iomem *base;
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struct cmd_params *cmd_params;
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size_t mtd_count;
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struct mtd_info mtd[0];
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};
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static u32 goldfish_nand_cmd_with_params(struct mtd_info *mtd,
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enum nand_cmd cmd, u64 addr, u32 len,
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void *ptr, u32 *rv)
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{
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u32 cmdp;
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struct goldfish_nand *nand = mtd->priv;
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struct cmd_params *cps = nand->cmd_params;
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unsigned char __iomem *base = nand->base;
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if (!cps)
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return -1;
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switch (cmd) {
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case NAND_CMD_ERASE:
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cmdp = NAND_CMD_ERASE_WITH_PARAMS;
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break;
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case NAND_CMD_READ:
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cmdp = NAND_CMD_READ_WITH_PARAMS;
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break;
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case NAND_CMD_WRITE:
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cmdp = NAND_CMD_WRITE_WITH_PARAMS;
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break;
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default:
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return -1;
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}
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cps->dev = mtd - nand->mtd;
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cps->addr_high = (u32)(addr >> 32);
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cps->addr_low = (u32)addr;
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cps->transfer_size = len;
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cps->data = (unsigned long)ptr;
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writel(cmdp, base + NAND_COMMAND);
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*rv = cps->result;
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return 0;
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}
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static u32 goldfish_nand_cmd(struct mtd_info *mtd, enum nand_cmd cmd,
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u64 addr, u32 len, void *ptr)
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{
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struct goldfish_nand *nand = mtd->priv;
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u32 rv;
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unsigned char __iomem *base = nand->base;
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mutex_lock(&nand->lock);
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if (goldfish_nand_cmd_with_params(mtd, cmd, addr, len, ptr, &rv)) {
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writel(mtd - nand->mtd, base + NAND_DEV);
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writel((u32)(addr >> 32), base + NAND_ADDR_HIGH);
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writel((u32)addr, base + NAND_ADDR_LOW);
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writel(len, base + NAND_TRANSFER_SIZE);
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gf_write_ptr(ptr, base + NAND_DATA, base + NAND_DATA_HIGH);
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writel(cmd, base + NAND_COMMAND);
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rv = readl(base + NAND_RESULT);
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}
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mutex_unlock(&nand->lock);
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return rv;
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}
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static int goldfish_nand_erase(struct mtd_info *mtd, struct erase_info *instr)
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{
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loff_t ofs = instr->addr;
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u32 len = instr->len;
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s32 rem;
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if (ofs + len > mtd->size)
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goto invalid_arg;
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ofs = div_s64_rem(ofs, mtd->writesize, &rem);
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if (rem)
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goto invalid_arg;
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ofs *= (mtd->writesize + mtd->oobsize);
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if (len % mtd->writesize)
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goto invalid_arg;
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len = len / mtd->writesize * (mtd->writesize + mtd->oobsize);
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if (goldfish_nand_cmd(mtd, NAND_CMD_ERASE, ofs, len, NULL) != len) {
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pr_err("goldfish_nand_erase: erase failed, start %llx, len %x, dev_size %llx, erase_size %x\n",
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ofs, len, mtd->size, mtd->erasesize);
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return -EIO;
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}
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instr->state = MTD_ERASE_DONE;
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mtd_erase_callback(instr);
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return 0;
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invalid_arg:
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pr_err("goldfish_nand_erase: invalid erase, start %llx, len %x, dev_size %llx, erase_size %x\n",
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ofs, len, mtd->size, mtd->erasesize);
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return -EINVAL;
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}
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static int goldfish_nand_read_oob(struct mtd_info *mtd, loff_t ofs,
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struct mtd_oob_ops *ops)
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{
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s32 rem;
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if (ofs + ops->len > mtd->size)
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goto invalid_arg;
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if (ops->datbuf && ops->len && ops->len != mtd->writesize)
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goto invalid_arg;
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if (ops->ooblen + ops->ooboffs > mtd->oobsize)
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goto invalid_arg;
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ofs = div_s64_rem(ofs, mtd->writesize, &rem);
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if (rem)
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goto invalid_arg;
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ofs *= (mtd->writesize + mtd->oobsize);
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if (ops->datbuf)
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ops->retlen = goldfish_nand_cmd(mtd, NAND_CMD_READ, ofs,
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ops->len, ops->datbuf);
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ofs += mtd->writesize + ops->ooboffs;
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if (ops->oobbuf)
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ops->oobretlen = goldfish_nand_cmd(mtd, NAND_CMD_READ, ofs,
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ops->ooblen, ops->oobbuf);
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return 0;
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invalid_arg:
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pr_err("goldfish_nand_read_oob: invalid read, start %llx, len %zx, ooblen %zx, dev_size %llx, write_size %x\n",
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ofs, ops->len, ops->ooblen, mtd->size, mtd->writesize);
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return -EINVAL;
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}
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static int goldfish_nand_write_oob(struct mtd_info *mtd, loff_t ofs,
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struct mtd_oob_ops *ops)
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{
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s32 rem;
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if (ofs + ops->len > mtd->size)
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goto invalid_arg;
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if (ops->len && ops->len != mtd->writesize)
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goto invalid_arg;
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if (ops->ooblen + ops->ooboffs > mtd->oobsize)
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goto invalid_arg;
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ofs = div_s64_rem(ofs, mtd->writesize, &rem);
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if (rem)
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goto invalid_arg;
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ofs *= (mtd->writesize + mtd->oobsize);
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if (ops->datbuf)
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ops->retlen = goldfish_nand_cmd(mtd, NAND_CMD_WRITE, ofs,
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ops->len, ops->datbuf);
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ofs += mtd->writesize + ops->ooboffs;
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if (ops->oobbuf)
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ops->oobretlen = goldfish_nand_cmd(mtd, NAND_CMD_WRITE, ofs,
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ops->ooblen, ops->oobbuf);
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return 0;
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invalid_arg:
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pr_err("goldfish_nand_write_oob: invalid write, start %llx, len %zx, ooblen %zx, dev_size %llx, write_size %x\n",
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ofs, ops->len, ops->ooblen, mtd->size, mtd->writesize);
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return -EINVAL;
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}
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static int goldfish_nand_read(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf)
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{
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s32 rem;
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if (from + len > mtd->size)
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goto invalid_arg;
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from = div_s64_rem(from, mtd->writesize, &rem);
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if (rem)
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goto invalid_arg;
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from *= (mtd->writesize + mtd->oobsize);
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*retlen = goldfish_nand_cmd(mtd, NAND_CMD_READ, from, len, buf);
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return 0;
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invalid_arg:
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pr_err("goldfish_nand_read: invalid read, start %llx, len %zx, dev_size %llx, write_size %x\n",
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from, len, mtd->size, mtd->writesize);
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return -EINVAL;
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}
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static int goldfish_nand_write(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf)
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{
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s32 rem;
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if (to + len > mtd->size)
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goto invalid_arg;
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to = div_s64_rem(to, mtd->writesize, &rem);
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if (rem)
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goto invalid_arg;
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to *= (mtd->writesize + mtd->oobsize);
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*retlen = goldfish_nand_cmd(mtd, NAND_CMD_WRITE, to, len, (void *)buf);
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return 0;
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invalid_arg:
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pr_err("goldfish_nand_write: invalid write, start %llx, len %zx, dev_size %llx, write_size %x\n",
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to, len, mtd->size, mtd->writesize);
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return -EINVAL;
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}
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static int goldfish_nand_block_isbad(struct mtd_info *mtd, loff_t ofs)
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{
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s32 rem;
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if (ofs >= mtd->size)
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goto invalid_arg;
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ofs = div_s64_rem(ofs, mtd->writesize, &rem);
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if (rem)
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goto invalid_arg;
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ofs *= mtd->erasesize / mtd->writesize;
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ofs *= (mtd->writesize + mtd->oobsize);
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return goldfish_nand_cmd(mtd, NAND_CMD_BLOCK_BAD_GET, ofs, 0, NULL);
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invalid_arg:
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pr_err("goldfish_nand_block_isbad: invalid arg, ofs %llx, dev_size %llx, write_size %x\n",
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ofs, mtd->size, mtd->writesize);
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return -EINVAL;
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}
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static int goldfish_nand_block_markbad(struct mtd_info *mtd, loff_t ofs)
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{
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s32 rem;
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if (ofs >= mtd->size)
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goto invalid_arg;
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ofs = div_s64_rem(ofs, mtd->writesize, &rem);
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if (rem)
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goto invalid_arg;
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ofs *= mtd->erasesize / mtd->writesize;
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ofs *= (mtd->writesize + mtd->oobsize);
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if (goldfish_nand_cmd(mtd, NAND_CMD_BLOCK_BAD_SET, ofs, 0, NULL) != 1)
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return -EIO;
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return 0;
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invalid_arg:
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pr_err("goldfish_nand_block_markbad: invalid arg, ofs %llx, dev_size %llx, write_size %x\n",
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ofs, mtd->size, mtd->writesize);
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return -EINVAL;
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}
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static int nand_setup_cmd_params(struct platform_device *pdev,
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struct goldfish_nand *nand)
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{
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dma_addr_t dma_handle;
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unsigned char __iomem *base = nand->base;
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nand->cmd_params = dmam_alloc_coherent(&pdev->dev,
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sizeof(struct cmd_params),
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&dma_handle, GFP_KERNEL);
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if (!nand->cmd_params) {
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dev_err(&pdev->dev, "allocate buffer failed\n");
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return -ENOMEM;
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}
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writel((u32)((u64)dma_handle >> 32), base + NAND_CMD_PARAMS_ADDR_HIGH);
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writel((u32)dma_handle, base + NAND_CMD_PARAMS_ADDR_LOW);
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return 0;
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}
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static int goldfish_nand_init_device(struct platform_device *pdev,
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struct goldfish_nand *nand, int id)
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{
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u32 name_len;
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u32 result;
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u32 flags;
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unsigned char __iomem *base = nand->base;
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struct mtd_info *mtd = &nand->mtd[id];
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char *name;
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mutex_lock(&nand->lock);
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writel(id, base + NAND_DEV);
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flags = readl(base + NAND_DEV_FLAGS);
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name_len = readl(base + NAND_DEV_NAME_LEN);
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mtd->writesize = readl(base + NAND_DEV_PAGE_SIZE);
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mtd->size = readl(base + NAND_DEV_SIZE_LOW);
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mtd->size |= (u64)readl(base + NAND_DEV_SIZE_HIGH) << 32;
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mtd->oobsize = readl(base + NAND_DEV_EXTRA_SIZE);
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mtd->oobavail = mtd->oobsize;
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mtd->erasesize = readl(base + NAND_DEV_ERASE_SIZE) /
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(mtd->writesize + mtd->oobsize) * mtd->writesize;
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mtd->size = div_s64(mtd->size, mtd->writesize + mtd->oobsize);
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mtd->size *= mtd->writesize;
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dev_dbg(&pdev->dev,
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"goldfish nand dev%d: size %llx, page %d, extra %d, erase %d\n",
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id, mtd->size, mtd->writesize,
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mtd->oobsize, mtd->erasesize);
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mutex_unlock(&nand->lock);
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mtd->priv = nand;
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name = devm_kzalloc(&pdev->dev, name_len + 1, GFP_KERNEL);
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if (!name)
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return -ENOMEM;
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mtd->name = name;
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result = goldfish_nand_cmd(mtd, NAND_CMD_GET_DEV_NAME, 0, name_len,
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name);
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if (result != name_len) {
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dev_err(&pdev->dev,
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"goldfish_nand_init_device failed to get dev name %d != %d\n",
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result, name_len);
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return -ENODEV;
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}
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((char *)mtd->name)[name_len] = '\0';
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/* Setup the MTD structure */
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mtd->type = MTD_NANDFLASH;
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mtd->flags = MTD_CAP_NANDFLASH;
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if (flags & NAND_DEV_FLAG_READ_ONLY)
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mtd->flags &= ~MTD_WRITEABLE;
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if (flags & NAND_DEV_FLAG_CMD_PARAMS_CAP)
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nand_setup_cmd_params(pdev, nand);
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mtd->owner = THIS_MODULE;
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mtd->_erase = goldfish_nand_erase;
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mtd->_read = goldfish_nand_read;
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mtd->_write = goldfish_nand_write;
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mtd->_read_oob = goldfish_nand_read_oob;
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mtd->_write_oob = goldfish_nand_write_oob;
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mtd->_block_isbad = goldfish_nand_block_isbad;
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mtd->_block_markbad = goldfish_nand_block_markbad;
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if (mtd_device_register(mtd, NULL, 0))
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return -EIO;
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return 0;
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}
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static int goldfish_nand_probe(struct platform_device *pdev)
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{
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u32 num_dev;
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int i;
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int err;
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u32 num_dev_working;
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u32 version;
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struct resource *r;
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struct goldfish_nand *nand;
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unsigned char __iomem *base;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r)
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return -ENODEV;
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base = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE);
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if (!base)
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return -ENOMEM;
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version = readl(base + NAND_VERSION);
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if (version != NAND_VERSION_CURRENT) {
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dev_err(&pdev->dev,
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"goldfish_nand_init: version mismatch, got %d, expected %d\n",
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version, NAND_VERSION_CURRENT);
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return -ENODEV;
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}
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num_dev = readl(base + NAND_NUM_DEV);
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if (num_dev == 0)
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return -ENODEV;
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nand = devm_kzalloc(&pdev->dev, sizeof(*nand) +
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sizeof(struct mtd_info) * num_dev, GFP_KERNEL);
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if (!nand)
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return -ENOMEM;
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mutex_init(&nand->lock);
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nand->base = base;
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nand->mtd_count = num_dev;
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platform_set_drvdata(pdev, nand);
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num_dev_working = 0;
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for (i = 0; i < num_dev; i++) {
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err = goldfish_nand_init_device(pdev, nand, i);
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if (err == 0)
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num_dev_working++;
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}
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if (num_dev_working == 0)
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return -ENODEV;
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return 0;
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}
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static int goldfish_nand_remove(struct platform_device *pdev)
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{
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struct goldfish_nand *nand = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < nand->mtd_count; i++) {
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if (nand->mtd[i].name)
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mtd_device_unregister(&nand->mtd[i]);
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}
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return 0;
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}
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static struct platform_driver goldfish_nand_driver = {
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.probe = goldfish_nand_probe,
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.remove = goldfish_nand_remove,
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.driver = {
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.name = "goldfish_nand"
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}
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};
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module_platform_driver(goldfish_nand_driver);
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MODULE_LICENSE("GPL");
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