--- /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 "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 == NULL)
+ 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_write64((u64)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;
+ u32 rem;
+
+ if (ofs + len > mtd->size)
+ goto invalid_arg;
+ rem = do_div(ofs, mtd->writesize);
+ 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("goldfish_nand_erase: erase failed, start %llx, len %x, dev_size %llx, erase_size %x\n",
+ ofs, len, mtd->size, mtd->erasesize);
+ return -EIO;
+ }
+
+ instr->state = MTD_ERASE_DONE;
+ mtd_erase_callback(instr);
+
+ return 0;
+
+invalid_arg:
+ pr_err("goldfish_nand_erase: invalid erase, start %llx, len %x, dev_size %llx, erase_size %x\n",
+ 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)
+{
+ u32 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;
+
+ rem = do_div(ofs, mtd->writesize);
+ 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("goldfish_nand_read_oob: invalid read, start %llx, len %zx, ooblen %zx, dev_size %llx, write_size %x\n",
+ 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)
+{
+ u32 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;
+
+ rem = do_div(ofs, mtd->writesize);
+ 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("goldfish_nand_write_oob: invalid write, start %llx, len %zx, ooblen %zx, dev_size %llx, write_size %x\n",
+ 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)
+{
+ u32 rem;
+
+ if (from + len > mtd->size)
+ goto invalid_arg;
+
+ rem = do_div(from, mtd->writesize);
+ 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("goldfish_nand_read: invalid read, start %llx, len %zx, dev_size %llx, write_size %x\n",
+ 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)
+{
+ u32 rem;
+
+ if (to + len > mtd->size)
+ goto invalid_arg;
+
+ rem = do_div(to, mtd->writesize);
+ 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("goldfish_nand_write: invalid write, start %llx, len %zx, dev_size %llx, write_size %x\n",
+ to, len, mtd->size, mtd->writesize);
+ return -EINVAL;
+}
+
+static int goldfish_nand_block_isbad(struct mtd_info *mtd, loff_t ofs)
+{
+ u32 rem;
+
+ if (ofs >= mtd->size)
+ goto invalid_arg;
+
+ rem = do_div(ofs, mtd->erasesize);
+ 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("goldfish_nand_block_isbad: invalid arg, ofs %llx, dev_size %llx, write_size %x\n",
+ ofs, mtd->size, mtd->writesize);
+ return -EINVAL;
+}
+
+static int goldfish_nand_block_markbad(struct mtd_info *mtd, loff_t ofs)
+{
+ u32 rem;
+
+ if (ofs >= mtd->size)
+ goto invalid_arg;
+
+ rem = do_div(ofs, mtd->erasesize);
+ 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("goldfish_nand_block_markbad: invalid arg, ofs %llx, dev_size %llx, write_size %x\n",
+ ofs, mtd->size, mtd->writesize);
+ return -EINVAL;
+}
+
+static int nand_setup_cmd_params(struct platform_device *pdev,
+ struct goldfish_nand *nand)
+{
+ u64 paddr;
+ unsigned char __iomem *base = nand->base;
+
+ nand->cmd_params = devm_kzalloc(&pdev->dev,
+ sizeof(struct cmd_params), GFP_KERNEL);
+ if (!nand->cmd_params)
+ return -1;
+
+ paddr = __pa(nand->cmd_params);
+ writel((u32)(paddr >> 32), base + NAND_CMD_PARAMS_ADDR_HIGH);
+ writel((u32)paddr, 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;
+ do_div(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,
+ "goldfish_nand_init_device failed to get dev name %d != %d\n",
+ 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 == NULL)
+ 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");
Code Review / kvmfornfv.git / blobdiff