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