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path: root/drivers/mtd/nand/ndfc.c
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Diffstat (limited to 'drivers/mtd/nand/ndfc.c')
-rw-r--r--drivers/mtd/nand/ndfc.c311
1 files changed, 311 insertions, 0 deletions
diff --git a/drivers/mtd/nand/ndfc.c b/drivers/mtd/nand/ndfc.c
new file mode 100644
index 00000000000..fe8d38514ba
--- /dev/null
+++ b/drivers/mtd/nand/ndfc.c
@@ -0,0 +1,311 @@
+/*
+ * drivers/mtd/ndfc.c
+ *
+ * Overview:
+ * Platform independend driver for NDFC (NanD Flash Controller)
+ * integrated into EP440 cores
+ *
+ * Author: Thomas Gleixner
+ *
+ * Copyright 2006 IBM
+ *
+ * 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.
+ *
+ */
+#include <linux/module.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/nand_ecc.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/ndfc.h>
+#include <linux/mtd/mtd.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+#include <asm/ibm44x.h>
+
+struct ndfc_nand_mtd {
+ struct mtd_info mtd;
+ struct nand_chip chip;
+ struct platform_nand_chip *pl_chip;
+};
+
+static struct ndfc_nand_mtd ndfc_mtd[NDFC_MAX_BANKS];
+
+struct ndfc_controller {
+ void __iomem *ndfcbase;
+ struct nand_hw_control ndfc_control;
+ atomic_t childs_active;
+};
+
+static struct ndfc_controller ndfc_ctrl;
+
+static void ndfc_select_chip(struct mtd_info *mtd, int chip)
+{
+ uint32_t ccr;
+ struct ndfc_controller *ndfc = &ndfc_ctrl;
+ struct nand_chip *nandchip = mtd->priv;
+ struct ndfc_nand_mtd *nandmtd = nandchip->priv;
+ struct platform_nand_chip *pchip = nandmtd->pl_chip;
+
+ ccr = __raw_readl(ndfc->ndfcbase + NDFC_CCR);
+ if (chip >= 0) {
+ ccr &= ~NDFC_CCR_BS_MASK;
+ ccr |= NDFC_CCR_BS(chip + pchip->chip_offset);
+ } else
+ ccr |= NDFC_CCR_RESET_CE;
+ writel(ccr, ndfc->ndfcbase + NDFC_CCR);
+}
+
+static void ndfc_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+ struct nand_chip *chip = mtd->priv;
+
+ if (cmd == NAND_CMD_NONE)
+ return;
+
+ if (ctrl & NAND_CLE)
+ writel(cmd & 0xFF, chip->IO_ADDR_W + NDFC_CMD);
+ else
+ writel(cmd & 0xFF, chip->IO_ADDR_W + NDFC_ALE);
+}
+
+static int ndfc_ready(struct mtd_info *mtd)
+{
+ struct ndfc_controller *ndfc = &ndfc_ctrl;
+
+ return __raw_readl(ndfc->ndfcbase + NDFC_STAT) & NDFC_STAT_IS_READY;
+}
+
+static void ndfc_enable_hwecc(struct mtd_info *mtd, int mode)
+{
+ uint32_t ccr;
+ struct ndfc_controller *ndfc = &ndfc_ctrl;
+
+ ccr = __raw_readl(ndfc->ndfcbase + NDFC_CCR);
+ ccr |= NDFC_CCR_RESET_ECC;
+ __raw_writel(ccr, ndfc->ndfcbase + NDFC_CCR);
+ wmb();
+}
+
+static int ndfc_calculate_ecc(struct mtd_info *mtd,
+ const u_char *dat, u_char *ecc_code)
+{
+ struct ndfc_controller *ndfc = &ndfc_ctrl;
+ uint32_t ecc;
+ uint8_t *p = (uint8_t *)&ecc;
+
+ wmb();
+ ecc = __raw_readl(ndfc->ndfcbase + NDFC_ECC);
+ ecc_code[0] = p[1];
+ ecc_code[1] = p[2];
+ ecc_code[2] = p[3];
+
+ return 0;
+}
+
+/*
+ * Speedups for buffer read/write/verify
+ *
+ * NDFC allows 32bit read/write of data. So we can speed up the buffer
+ * functions. No further checking, as nand_base will always read/write
+ * page aligned.
+ */
+static void ndfc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+ struct ndfc_controller *ndfc = &ndfc_ctrl;
+ uint32_t *p = (uint32_t *) buf;
+
+ for(;len > 0; len -= 4)
+ *p++ = __raw_readl(ndfc->ndfcbase + NDFC_DATA);
+}
+
+static void ndfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
+{
+ struct ndfc_controller *ndfc = &ndfc_ctrl;
+ uint32_t *p = (uint32_t *) buf;
+
+ for(;len > 0; len -= 4)
+ __raw_writel(*p++, ndfc->ndfcbase + NDFC_DATA);
+}
+
+static int ndfc_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
+{
+ struct ndfc_controller *ndfc = &ndfc_ctrl;
+ uint32_t *p = (uint32_t *) buf;
+
+ for(;len > 0; len -= 4)
+ if (*p++ != __raw_readl(ndfc->ndfcbase + NDFC_DATA))
+ return -EFAULT;
+ return 0;
+}
+
+/*
+ * Initialize chip structure
+ */
+static void ndfc_chip_init(struct ndfc_nand_mtd *mtd)
+{
+ struct ndfc_controller *ndfc = &ndfc_ctrl;
+ struct nand_chip *chip = &mtd->chip;
+
+ chip->IO_ADDR_R = ndfc->ndfcbase + NDFC_DATA;
+ chip->IO_ADDR_W = ndfc->ndfcbase + NDFC_DATA;
+ chip->cmd_ctrl = ndfc_hwcontrol;
+ chip->dev_ready = ndfc_ready;
+ chip->select_chip = ndfc_select_chip;
+ chip->chip_delay = 50;
+ chip->priv = mtd;
+ chip->options = mtd->pl_chip->options;
+ chip->controller = &ndfc->ndfc_control;
+ chip->read_buf = ndfc_read_buf;
+ chip->write_buf = ndfc_write_buf;
+ chip->verify_buf = ndfc_verify_buf;
+ chip->ecc.correct = nand_correct_data;
+ chip->ecc.hwctl = ndfc_enable_hwecc;
+ chip->ecc.calculate = ndfc_calculate_ecc;
+ chip->ecc.mode = NAND_ECC_HW;
+ chip->ecc.size = 256;
+ chip->ecc.bytes = 3;
+ chip->ecclayout = mtd->pl_chip->ecclayout;
+ mtd->mtd.priv = chip;
+ mtd->mtd.owner = THIS_MODULE;
+}
+
+static int ndfc_chip_probe(struct platform_device *pdev)
+{
+ struct platform_nand_chip *nc = pdev->dev.platform_data;
+ struct ndfc_chip_settings *settings = nc->priv;
+ struct ndfc_controller *ndfc = &ndfc_ctrl;
+ struct ndfc_nand_mtd *nandmtd;
+
+ if (nc->chip_offset >= NDFC_MAX_BANKS || nc->nr_chips > NDFC_MAX_BANKS)
+ return -EINVAL;
+
+ /* Set the bank settings */
+ __raw_writel(settings->bank_settings,
+ ndfc->ndfcbase + NDFC_BCFG0 + (nc->chip_offset << 2));
+
+ nandmtd = &ndfc_mtd[pdev->id];
+ if (nandmtd->pl_chip)
+ return -EBUSY;
+
+ nandmtd->pl_chip = nc;
+ ndfc_chip_init(nandmtd);
+
+ /* Scan for chips */
+ if (nand_scan(&nandmtd->mtd, nc->nr_chips)) {
+ nandmtd->pl_chip = NULL;
+ return -ENODEV;
+ }
+
+#ifdef CONFIG_MTD_PARTITIONS
+ printk("Number of partitions %d\n", nc->nr_partitions);
+ if (nc->nr_partitions) {
+ /* Add the full device, so complete dumps can be made */
+ add_mtd_device(&nandmtd->mtd);
+ add_mtd_partitions(&nandmtd->mtd, nc->partitions,
+ nc->nr_partitions);
+
+ } else
+#else
+ add_mtd_device(&nandmtd->mtd);
+#endif
+
+ atomic_inc(&ndfc->childs_active);
+ return 0;
+}
+
+static int ndfc_chip_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static int ndfc_nand_probe(struct platform_device *pdev)
+{
+ struct platform_nand_ctrl *nc = pdev->dev.platform_data;
+ struct ndfc_controller_settings *settings = nc->priv;
+ struct resource *res = pdev->resource;
+ struct ndfc_controller *ndfc = &ndfc_ctrl;
+ unsigned long long phys = settings->ndfc_erpn | res->start;
+
+ ndfc->ndfcbase = ioremap64(phys, res->end - res->start + 1);
+ if (!ndfc->ndfcbase) {
+ printk(KERN_ERR "NDFC: ioremap failed\n");
+ return -EIO;
+ }
+
+ __raw_writel(settings->ccr_settings, ndfc->ndfcbase + NDFC_CCR);
+
+ spin_lock_init(&ndfc->ndfc_control.lock);
+ init_waitqueue_head(&ndfc->ndfc_control.wq);
+
+ platform_set_drvdata(pdev, ndfc);
+
+ printk("NDFC NAND Driver initialized. Chip-Rev: 0x%08x\n",
+ __raw_readl(ndfc->ndfcbase + NDFC_REVID));
+
+ return 0;
+}
+
+static int ndfc_nand_remove(struct platform_device *pdev)
+{
+ struct ndfc_controller *ndfc = platform_get_drvdata(pdev);
+
+ if (atomic_read(&ndfc->childs_active))
+ return -EBUSY;
+
+ if (ndfc) {
+ platform_set_drvdata(pdev, NULL);
+ iounmap(ndfc_ctrl.ndfcbase);
+ ndfc_ctrl.ndfcbase = NULL;
+ }
+ return 0;
+}
+
+/* driver device registration */
+
+static struct platform_driver ndfc_chip_driver = {
+ .probe = ndfc_chip_probe,
+ .remove = ndfc_chip_remove,
+ .driver = {
+ .name = "ndfc-chip",
+ .owner = THIS_MODULE,
+ },
+};
+
+static struct platform_driver ndfc_nand_driver = {
+ .probe = ndfc_nand_probe,
+ .remove = ndfc_nand_remove,
+ .driver = {
+ .name = "ndfc-nand",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init ndfc_nand_init(void)
+{
+ int ret;
+
+ spin_lock_init(&ndfc_ctrl.ndfc_control.lock);
+ init_waitqueue_head(&ndfc_ctrl.ndfc_control.wq);
+
+ ret = platform_driver_register(&ndfc_nand_driver);
+ if (!ret)
+ ret = platform_driver_register(&ndfc_chip_driver);
+ return ret;
+}
+
+static void __exit ndfc_nand_exit(void)
+{
+ platform_driver_unregister(&ndfc_chip_driver);
+ platform_driver_unregister(&ndfc_nand_driver);
+}
+
+module_init(ndfc_nand_init);
+module_exit(ndfc_nand_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
+MODULE_DESCRIPTION("Platform driver for NDFC");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-28 11:03:04 +0000