X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;ds=sidebyside;f=drivers%2Fmtd%2Fnand%2Fndfc.c;fp=drivers%2Fmtd%2Fnand%2Fndfc.c;h=e5bd88f2d560ae3966fe5169c6885c5c0d4d235f;hb=f05f9504c50ed069377d37f02f22e7a16b5921de;hp=0000000000000000000000000000000000000000;hpb=16c70f8c1b54b61c3b951b6fb220df250fe09b32;p=linux-2.6.git diff --git a/drivers/mtd/nand/ndfc.c b/drivers/mtd/nand/ndfc.c new file mode 100644 index 000000000..e5bd88f2d --- /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 +#include +#include +#include +#include +#include +#include + +#include +#include + +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 ndfc_controller *ndfc = &ndfc_ctrl; + + if (cmd == NAND_CMD_NONE) + return; + + if (ctrl & NAND_CLE) + writel(cmd & 0xFF, ndfc->ndfcbase + NDFC_CMD); + else + writel(cmd & 0xFF, ndfc->ndfcbase + 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 "); +MODULE_DESCRIPTION("Platform driver for NDFC");