[MTD] Add support for NDFC NAND controller

NDFC NAND Flash controller is embedded in PPC EP44x SoCs.
Add platform driver based support.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 324 insertions, 0 deletions

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 4d235b91267d..c2cb87fc4cb8 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -129,6 +129,12 @@ config MTD_NAND_S3C2410_HWECC
           currently not be able to switch to software, as there is no
           implementation for ECC method used by the S3C2410
 
+config MTD_NAND_NDFC
+        tristate "NDFC NanD Flash Controller"
+        depends on MTD_NAND && 44x
+        help
+         NDFC Nand Flash Controllers are integrated in EP44x SoCs
+
 config MTD_NAND_DISKONCHIP
         tristate "DiskOnChip 2000, Millennium and Millennium Plus (NAND reimplementation) (EXPERIMENTAL)"
         depends on MTD_NAND && EXPERIMENTAL
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 33475087dbff..f74759351c91 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -21,5 +21,6 @@ obj-$(CONFIG_MTD_NAND_SHARPSL)		+= sharpsl.o
 obj-$(CONFIG_MTD_NAND_TS7250)           += ts7250.o
 obj-$(CONFIG_MTD_NAND_NANDSIM)          += nandsim.o
 obj-$(CONFIG_MTD_NAND_CS553X)           += cs553x_nand.o
+obj-$(CONFIG_MTD_NAND_NDFC)             += ndfc.o
 
 nand-objs = nand_base.o nand_bbt.o
diff --git a/drivers/mtd/nand/ndfc.c b/drivers/mtd/nand/ndfc.c
new file mode 100644
index 000000000000..22fd682b70ca
--- /dev/null
+++ b/drivers/mtd/nand/ndfc.c
@@ -0,0 +1,317 @@
+/*
+ *  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/ubi.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)
+{
+        struct ndfc_controller *ndfc = &ndfc_ctrl;
+        struct nand_chip *chip = mtd->priv;
+
+        switch (cmd) {
+        case NAND_CTL_SETCLE:
+                chip->IO_ADDR_W = ndfc->ndfcbase + NDFC_CMD;
+                break;
+        case NAND_CTL_SETALE:
+                chip->IO_ADDR_W = ndfc->ndfcbase + NDFC_ALE;
+                break;
+        default:
+                chip->IO_ADDR_W = ndfc->ndfcbase + NDFC_DATA;
+                break;
+        }
+}
+
+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->hwcontrol = 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->correct_data  = nand_correct_data;
+        chip->enable_hwecc  = ndfc_enable_hwecc;
+        chip->calculate_ecc = ndfc_calculate_ecc;
+        chip->eccmode = NAND_ECC_HW3_256;
+        chip->autooob = mtd->pl_chip->autooob;
+        mtd->mtd.priv = chip;
+        mtd->mtd.owner = THIS_MODULE;
+}
+
+static int ndfc_chip_probe(struct platform_device *pdev)
+{
+        int rc;
+        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) {
+                struct mtd_info *mtd_ubi;
+                nc->partitions[NAND_PARTS_CONTENT_IDX].mtdp = &mtd_ubi;
+
+                add_mtd_device(&nandmtd->mtd); /* for testing */
+                add_mtd_partitions(&nandmtd->mtd,
+                                   nc->partitions,
+                                   nc->nr_partitions);
+
+                add_mtd_device(mtd_ubi);
+
+        } 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 = NDFC_PHYSADDR_OFFS | 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 = 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");