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![Boris BREZILLON](/assets/img/avatar_default.png)
The ->read_xxx() methods are all passed the page number the NAND controller is supposed to read, but ->write_xxx() do not have such a parameter. This is a problem if we want to properly implement data scrambling/randomization in order to mitigate MLC sensibility to repeated pattern: to prevent bitflips in adjacent pages in the same block we need to avoid repeating the same pattern at the same offset in those pages, hence the randomizer/scrambler engine need to be passed the page value in order to adapt its seed accordingly. Moreover, adding the page parameter to the ->write_xxx() methods add some consistency to the current API. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> CC: Josh Wu <josh.wu@atmel.com> CC: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> CC: Maxime Ripard <maxime.ripard@free-electrons.com> CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org> CC: Huang Shijie <shijie.huang@arm.com> CC: Stefan Agner <stefan@agner.ch> CC: devel@driverdev.osuosl.org CC: linux-arm-kernel@lists.infradead.org CC: linux-kernel@vger.kernel.org Signed-off-by: Brian Norris <computersforpeace@gmail.com>
2086 lines
59 KiB
C
2086 lines
59 KiB
C
/*
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* Copyright © 2004 Texas Instruments, Jian Zhang <jzhang@ti.com>
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* Copyright © 2004 Micron Technology Inc.
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* Copyright © 2004 David Brownell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/platform_device.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/jiffies.h>
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#include <linux/sched.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/partitions.h>
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#include <linux/omap-dma.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/mtd/nand_bch.h>
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#include <linux/platform_data/elm.h>
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#include <linux/platform_data/mtd-nand-omap2.h>
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#define DRIVER_NAME "omap2-nand"
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#define OMAP_NAND_TIMEOUT_MS 5000
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#define NAND_Ecc_P1e (1 << 0)
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#define NAND_Ecc_P2e (1 << 1)
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#define NAND_Ecc_P4e (1 << 2)
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#define NAND_Ecc_P8e (1 << 3)
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#define NAND_Ecc_P16e (1 << 4)
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#define NAND_Ecc_P32e (1 << 5)
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#define NAND_Ecc_P64e (1 << 6)
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#define NAND_Ecc_P128e (1 << 7)
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#define NAND_Ecc_P256e (1 << 8)
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#define NAND_Ecc_P512e (1 << 9)
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#define NAND_Ecc_P1024e (1 << 10)
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#define NAND_Ecc_P2048e (1 << 11)
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#define NAND_Ecc_P1o (1 << 16)
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#define NAND_Ecc_P2o (1 << 17)
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#define NAND_Ecc_P4o (1 << 18)
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#define NAND_Ecc_P8o (1 << 19)
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#define NAND_Ecc_P16o (1 << 20)
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#define NAND_Ecc_P32o (1 << 21)
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#define NAND_Ecc_P64o (1 << 22)
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#define NAND_Ecc_P128o (1 << 23)
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#define NAND_Ecc_P256o (1 << 24)
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#define NAND_Ecc_P512o (1 << 25)
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#define NAND_Ecc_P1024o (1 << 26)
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#define NAND_Ecc_P2048o (1 << 27)
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#define TF(value) (value ? 1 : 0)
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#define P2048e(a) (TF(a & NAND_Ecc_P2048e) << 0)
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#define P2048o(a) (TF(a & NAND_Ecc_P2048o) << 1)
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#define P1e(a) (TF(a & NAND_Ecc_P1e) << 2)
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#define P1o(a) (TF(a & NAND_Ecc_P1o) << 3)
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#define P2e(a) (TF(a & NAND_Ecc_P2e) << 4)
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#define P2o(a) (TF(a & NAND_Ecc_P2o) << 5)
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#define P4e(a) (TF(a & NAND_Ecc_P4e) << 6)
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#define P4o(a) (TF(a & NAND_Ecc_P4o) << 7)
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#define P8e(a) (TF(a & NAND_Ecc_P8e) << 0)
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#define P8o(a) (TF(a & NAND_Ecc_P8o) << 1)
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#define P16e(a) (TF(a & NAND_Ecc_P16e) << 2)
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#define P16o(a) (TF(a & NAND_Ecc_P16o) << 3)
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#define P32e(a) (TF(a & NAND_Ecc_P32e) << 4)
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#define P32o(a) (TF(a & NAND_Ecc_P32o) << 5)
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#define P64e(a) (TF(a & NAND_Ecc_P64e) << 6)
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#define P64o(a) (TF(a & NAND_Ecc_P64o) << 7)
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#define P128e(a) (TF(a & NAND_Ecc_P128e) << 0)
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#define P128o(a) (TF(a & NAND_Ecc_P128o) << 1)
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#define P256e(a) (TF(a & NAND_Ecc_P256e) << 2)
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#define P256o(a) (TF(a & NAND_Ecc_P256o) << 3)
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#define P512e(a) (TF(a & NAND_Ecc_P512e) << 4)
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#define P512o(a) (TF(a & NAND_Ecc_P512o) << 5)
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#define P1024e(a) (TF(a & NAND_Ecc_P1024e) << 6)
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#define P1024o(a) (TF(a & NAND_Ecc_P1024o) << 7)
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#define P8e_s(a) (TF(a & NAND_Ecc_P8e) << 0)
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#define P8o_s(a) (TF(a & NAND_Ecc_P8o) << 1)
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#define P16e_s(a) (TF(a & NAND_Ecc_P16e) << 2)
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#define P16o_s(a) (TF(a & NAND_Ecc_P16o) << 3)
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#define P1e_s(a) (TF(a & NAND_Ecc_P1e) << 4)
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#define P1o_s(a) (TF(a & NAND_Ecc_P1o) << 5)
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#define P2e_s(a) (TF(a & NAND_Ecc_P2e) << 6)
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#define P2o_s(a) (TF(a & NAND_Ecc_P2o) << 7)
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#define P4e_s(a) (TF(a & NAND_Ecc_P4e) << 0)
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#define P4o_s(a) (TF(a & NAND_Ecc_P4o) << 1)
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#define PREFETCH_CONFIG1_CS_SHIFT 24
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#define ECC_CONFIG_CS_SHIFT 1
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#define CS_MASK 0x7
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#define ENABLE_PREFETCH (0x1 << 7)
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#define DMA_MPU_MODE_SHIFT 2
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#define ECCSIZE0_SHIFT 12
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#define ECCSIZE1_SHIFT 22
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#define ECC1RESULTSIZE 0x1
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#define ECCCLEAR 0x100
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#define ECC1 0x1
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#define PREFETCH_FIFOTHRESHOLD_MAX 0x40
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#define PREFETCH_FIFOTHRESHOLD(val) ((val) << 8)
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#define PREFETCH_STATUS_COUNT(val) (val & 0x00003fff)
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#define PREFETCH_STATUS_FIFO_CNT(val) ((val >> 24) & 0x7F)
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#define STATUS_BUFF_EMPTY 0x00000001
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#define OMAP24XX_DMA_GPMC 4
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#define SECTOR_BYTES 512
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/* 4 bit padding to make byte aligned, 56 = 52 + 4 */
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#define BCH4_BIT_PAD 4
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/* GPMC ecc engine settings for read */
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#define BCH_WRAPMODE_1 1 /* BCH wrap mode 1 */
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#define BCH8R_ECC_SIZE0 0x1a /* ecc_size0 = 26 */
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#define BCH8R_ECC_SIZE1 0x2 /* ecc_size1 = 2 */
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#define BCH4R_ECC_SIZE0 0xd /* ecc_size0 = 13 */
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#define BCH4R_ECC_SIZE1 0x3 /* ecc_size1 = 3 */
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/* GPMC ecc engine settings for write */
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#define BCH_WRAPMODE_6 6 /* BCH wrap mode 6 */
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#define BCH_ECC_SIZE0 0x0 /* ecc_size0 = 0, no oob protection */
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#define BCH_ECC_SIZE1 0x20 /* ecc_size1 = 32 */
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#define BADBLOCK_MARKER_LENGTH 2
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static u_char bch16_vector[] = {0xf5, 0x24, 0x1c, 0xd0, 0x61, 0xb3, 0xf1, 0x55,
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0x2e, 0x2c, 0x86, 0xa3, 0xed, 0x36, 0x1b, 0x78,
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0x48, 0x76, 0xa9, 0x3b, 0x97, 0xd1, 0x7a, 0x93,
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0x07, 0x0e};
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static u_char bch8_vector[] = {0xf3, 0xdb, 0x14, 0x16, 0x8b, 0xd2, 0xbe, 0xcc,
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0xac, 0x6b, 0xff, 0x99, 0x7b};
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static u_char bch4_vector[] = {0x00, 0x6b, 0x31, 0xdd, 0x41, 0xbc, 0x10};
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/* Shared among all NAND instances to synchronize access to the ECC Engine */
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static struct nand_hw_control omap_gpmc_controller = {
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.lock = __SPIN_LOCK_UNLOCKED(omap_gpmc_controller.lock),
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.wq = __WAIT_QUEUE_HEAD_INITIALIZER(omap_gpmc_controller.wq),
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};
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struct omap_nand_info {
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struct omap_nand_platform_data *pdata;
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struct mtd_info mtd;
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struct nand_chip nand;
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struct platform_device *pdev;
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int gpmc_cs;
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unsigned long phys_base;
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enum omap_ecc ecc_opt;
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struct completion comp;
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struct dma_chan *dma;
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int gpmc_irq_fifo;
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int gpmc_irq_count;
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enum {
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OMAP_NAND_IO_READ = 0, /* read */
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OMAP_NAND_IO_WRITE, /* write */
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} iomode;
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u_char *buf;
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int buf_len;
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struct gpmc_nand_regs reg;
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/* generated at runtime depending on ECC algorithm and layout selected */
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struct nand_ecclayout oobinfo;
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/* fields specific for BCHx_HW ECC scheme */
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struct device *elm_dev;
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struct device_node *of_node;
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};
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/**
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* omap_prefetch_enable - configures and starts prefetch transfer
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* @cs: cs (chip select) number
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* @fifo_th: fifo threshold to be used for read/ write
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* @dma_mode: dma mode enable (1) or disable (0)
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* @u32_count: number of bytes to be transferred
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* @is_write: prefetch read(0) or write post(1) mode
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*/
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static int omap_prefetch_enable(int cs, int fifo_th, int dma_mode,
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unsigned int u32_count, int is_write, struct omap_nand_info *info)
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{
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u32 val;
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if (fifo_th > PREFETCH_FIFOTHRESHOLD_MAX)
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return -1;
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if (readl(info->reg.gpmc_prefetch_control))
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return -EBUSY;
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/* Set the amount of bytes to be prefetched */
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writel(u32_count, info->reg.gpmc_prefetch_config2);
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/* Set dma/mpu mode, the prefetch read / post write and
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* enable the engine. Set which cs is has requested for.
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*/
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val = ((cs << PREFETCH_CONFIG1_CS_SHIFT) |
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PREFETCH_FIFOTHRESHOLD(fifo_th) | ENABLE_PREFETCH |
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(dma_mode << DMA_MPU_MODE_SHIFT) | (0x1 & is_write));
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writel(val, info->reg.gpmc_prefetch_config1);
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/* Start the prefetch engine */
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writel(0x1, info->reg.gpmc_prefetch_control);
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return 0;
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}
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/**
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* omap_prefetch_reset - disables and stops the prefetch engine
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*/
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static int omap_prefetch_reset(int cs, struct omap_nand_info *info)
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{
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u32 config1;
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/* check if the same module/cs is trying to reset */
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config1 = readl(info->reg.gpmc_prefetch_config1);
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if (((config1 >> PREFETCH_CONFIG1_CS_SHIFT) & CS_MASK) != cs)
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return -EINVAL;
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/* Stop the PFPW engine */
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writel(0x0, info->reg.gpmc_prefetch_control);
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/* Reset/disable the PFPW engine */
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writel(0x0, info->reg.gpmc_prefetch_config1);
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return 0;
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}
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/**
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* omap_hwcontrol - hardware specific access to control-lines
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* @mtd: MTD device structure
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* @cmd: command to device
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* @ctrl:
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* NAND_NCE: bit 0 -> don't care
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* NAND_CLE: bit 1 -> Command Latch
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* NAND_ALE: bit 2 -> Address Latch
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*
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* NOTE: boards may use different bits for these!!
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*/
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static void omap_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
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{
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struct omap_nand_info *info = container_of(mtd,
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struct omap_nand_info, mtd);
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if (cmd != NAND_CMD_NONE) {
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if (ctrl & NAND_CLE)
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writeb(cmd, info->reg.gpmc_nand_command);
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else if (ctrl & NAND_ALE)
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writeb(cmd, info->reg.gpmc_nand_address);
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else /* NAND_NCE */
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writeb(cmd, info->reg.gpmc_nand_data);
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}
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}
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/**
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* omap_read_buf8 - read data from NAND controller into buffer
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* @mtd: MTD device structure
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* @buf: buffer to store date
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* @len: number of bytes to read
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*/
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static void omap_read_buf8(struct mtd_info *mtd, u_char *buf, int len)
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{
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struct nand_chip *nand = mtd->priv;
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ioread8_rep(nand->IO_ADDR_R, buf, len);
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}
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/**
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* omap_write_buf8 - write buffer to NAND controller
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* @mtd: MTD device structure
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* @buf: data buffer
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* @len: number of bytes to write
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*/
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static void omap_write_buf8(struct mtd_info *mtd, const u_char *buf, int len)
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{
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struct omap_nand_info *info = container_of(mtd,
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struct omap_nand_info, mtd);
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u_char *p = (u_char *)buf;
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u32 status = 0;
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while (len--) {
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iowrite8(*p++, info->nand.IO_ADDR_W);
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/* wait until buffer is available for write */
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do {
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status = readl(info->reg.gpmc_status) &
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STATUS_BUFF_EMPTY;
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} while (!status);
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}
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}
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/**
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* omap_read_buf16 - read data from NAND controller into buffer
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* @mtd: MTD device structure
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* @buf: buffer to store date
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* @len: number of bytes to read
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*/
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static void omap_read_buf16(struct mtd_info *mtd, u_char *buf, int len)
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{
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struct nand_chip *nand = mtd->priv;
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ioread16_rep(nand->IO_ADDR_R, buf, len / 2);
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}
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/**
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* omap_write_buf16 - write buffer to NAND controller
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* @mtd: MTD device structure
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* @buf: data buffer
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* @len: number of bytes to write
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*/
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static void omap_write_buf16(struct mtd_info *mtd, const u_char * buf, int len)
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{
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struct omap_nand_info *info = container_of(mtd,
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struct omap_nand_info, mtd);
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u16 *p = (u16 *) buf;
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u32 status = 0;
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/* FIXME try bursts of writesw() or DMA ... */
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len >>= 1;
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while (len--) {
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iowrite16(*p++, info->nand.IO_ADDR_W);
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/* wait until buffer is available for write */
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do {
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status = readl(info->reg.gpmc_status) &
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STATUS_BUFF_EMPTY;
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} while (!status);
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}
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}
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/**
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* omap_read_buf_pref - read data from NAND controller into buffer
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* @mtd: MTD device structure
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* @buf: buffer to store date
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* @len: number of bytes to read
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*/
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static void omap_read_buf_pref(struct mtd_info *mtd, u_char *buf, int len)
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{
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struct omap_nand_info *info = container_of(mtd,
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struct omap_nand_info, mtd);
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uint32_t r_count = 0;
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int ret = 0;
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u32 *p = (u32 *)buf;
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/* take care of subpage reads */
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if (len % 4) {
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if (info->nand.options & NAND_BUSWIDTH_16)
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omap_read_buf16(mtd, buf, len % 4);
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else
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omap_read_buf8(mtd, buf, len % 4);
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p = (u32 *) (buf + len % 4);
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len -= len % 4;
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}
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/* configure and start prefetch transfer */
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ret = omap_prefetch_enable(info->gpmc_cs,
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PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x0, info);
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if (ret) {
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/* PFPW engine is busy, use cpu copy method */
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if (info->nand.options & NAND_BUSWIDTH_16)
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omap_read_buf16(mtd, (u_char *)p, len);
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else
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omap_read_buf8(mtd, (u_char *)p, len);
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} else {
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do {
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r_count = readl(info->reg.gpmc_prefetch_status);
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r_count = PREFETCH_STATUS_FIFO_CNT(r_count);
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r_count = r_count >> 2;
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ioread32_rep(info->nand.IO_ADDR_R, p, r_count);
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p += r_count;
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len -= r_count << 2;
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} while (len);
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/* disable and stop the PFPW engine */
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omap_prefetch_reset(info->gpmc_cs, info);
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}
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}
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/**
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* omap_write_buf_pref - write buffer to NAND controller
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* @mtd: MTD device structure
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* @buf: data buffer
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* @len: number of bytes to write
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*/
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static void omap_write_buf_pref(struct mtd_info *mtd,
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const u_char *buf, int len)
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{
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struct omap_nand_info *info = container_of(mtd,
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struct omap_nand_info, mtd);
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uint32_t w_count = 0;
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int i = 0, ret = 0;
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u16 *p = (u16 *)buf;
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unsigned long tim, limit;
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u32 val;
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/* take care of subpage writes */
|
|
if (len % 2 != 0) {
|
|
writeb(*buf, info->nand.IO_ADDR_W);
|
|
p = (u16 *)(buf + 1);
|
|
len--;
|
|
}
|
|
|
|
/* configure and start prefetch transfer */
|
|
ret = omap_prefetch_enable(info->gpmc_cs,
|
|
PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x1, info);
|
|
if (ret) {
|
|
/* PFPW engine is busy, use cpu copy method */
|
|
if (info->nand.options & NAND_BUSWIDTH_16)
|
|
omap_write_buf16(mtd, (u_char *)p, len);
|
|
else
|
|
omap_write_buf8(mtd, (u_char *)p, len);
|
|
} else {
|
|
while (len) {
|
|
w_count = readl(info->reg.gpmc_prefetch_status);
|
|
w_count = PREFETCH_STATUS_FIFO_CNT(w_count);
|
|
w_count = w_count >> 1;
|
|
for (i = 0; (i < w_count) && len; i++, len -= 2)
|
|
iowrite16(*p++, info->nand.IO_ADDR_W);
|
|
}
|
|
/* wait for data to flushed-out before reset the prefetch */
|
|
tim = 0;
|
|
limit = (loops_per_jiffy *
|
|
msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS));
|
|
do {
|
|
cpu_relax();
|
|
val = readl(info->reg.gpmc_prefetch_status);
|
|
val = PREFETCH_STATUS_COUNT(val);
|
|
} while (val && (tim++ < limit));
|
|
|
|
/* disable and stop the PFPW engine */
|
|
omap_prefetch_reset(info->gpmc_cs, info);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* omap_nand_dma_callback: callback on the completion of dma transfer
|
|
* @data: pointer to completion data structure
|
|
*/
|
|
static void omap_nand_dma_callback(void *data)
|
|
{
|
|
complete((struct completion *) data);
|
|
}
|
|
|
|
/*
|
|
* omap_nand_dma_transfer: configure and start dma transfer
|
|
* @mtd: MTD device structure
|
|
* @addr: virtual address in RAM of source/destination
|
|
* @len: number of data bytes to be transferred
|
|
* @is_write: flag for read/write operation
|
|
*/
|
|
static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
|
|
unsigned int len, int is_write)
|
|
{
|
|
struct omap_nand_info *info = container_of(mtd,
|
|
struct omap_nand_info, mtd);
|
|
struct dma_async_tx_descriptor *tx;
|
|
enum dma_data_direction dir = is_write ? DMA_TO_DEVICE :
|
|
DMA_FROM_DEVICE;
|
|
struct scatterlist sg;
|
|
unsigned long tim, limit;
|
|
unsigned n;
|
|
int ret;
|
|
u32 val;
|
|
|
|
if (addr >= high_memory) {
|
|
struct page *p1;
|
|
|
|
if (((size_t)addr & PAGE_MASK) !=
|
|
((size_t)(addr + len - 1) & PAGE_MASK))
|
|
goto out_copy;
|
|
p1 = vmalloc_to_page(addr);
|
|
if (!p1)
|
|
goto out_copy;
|
|
addr = page_address(p1) + ((size_t)addr & ~PAGE_MASK);
|
|
}
|
|
|
|
sg_init_one(&sg, addr, len);
|
|
n = dma_map_sg(info->dma->device->dev, &sg, 1, dir);
|
|
if (n == 0) {
|
|
dev_err(&info->pdev->dev,
|
|
"Couldn't DMA map a %d byte buffer\n", len);
|
|
goto out_copy;
|
|
}
|
|
|
|
tx = dmaengine_prep_slave_sg(info->dma, &sg, n,
|
|
is_write ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
|
|
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
|
|
if (!tx)
|
|
goto out_copy_unmap;
|
|
|
|
tx->callback = omap_nand_dma_callback;
|
|
tx->callback_param = &info->comp;
|
|
dmaengine_submit(tx);
|
|
|
|
/* configure and start prefetch transfer */
|
|
ret = omap_prefetch_enable(info->gpmc_cs,
|
|
PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write, info);
|
|
if (ret)
|
|
/* PFPW engine is busy, use cpu copy method */
|
|
goto out_copy_unmap;
|
|
|
|
init_completion(&info->comp);
|
|
dma_async_issue_pending(info->dma);
|
|
|
|
/* setup and start DMA using dma_addr */
|
|
wait_for_completion(&info->comp);
|
|
tim = 0;
|
|
limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS));
|
|
|
|
do {
|
|
cpu_relax();
|
|
val = readl(info->reg.gpmc_prefetch_status);
|
|
val = PREFETCH_STATUS_COUNT(val);
|
|
} while (val && (tim++ < limit));
|
|
|
|
/* disable and stop the PFPW engine */
|
|
omap_prefetch_reset(info->gpmc_cs, info);
|
|
|
|
dma_unmap_sg(info->dma->device->dev, &sg, 1, dir);
|
|
return 0;
|
|
|
|
out_copy_unmap:
|
|
dma_unmap_sg(info->dma->device->dev, &sg, 1, dir);
|
|
out_copy:
|
|
if (info->nand.options & NAND_BUSWIDTH_16)
|
|
is_write == 0 ? omap_read_buf16(mtd, (u_char *) addr, len)
|
|
: omap_write_buf16(mtd, (u_char *) addr, len);
|
|
else
|
|
is_write == 0 ? omap_read_buf8(mtd, (u_char *) addr, len)
|
|
: omap_write_buf8(mtd, (u_char *) addr, len);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap_read_buf_dma_pref - read data from NAND controller into buffer
|
|
* @mtd: MTD device structure
|
|
* @buf: buffer to store date
|
|
* @len: number of bytes to read
|
|
*/
|
|
static void omap_read_buf_dma_pref(struct mtd_info *mtd, u_char *buf, int len)
|
|
{
|
|
if (len <= mtd->oobsize)
|
|
omap_read_buf_pref(mtd, buf, len);
|
|
else
|
|
/* start transfer in DMA mode */
|
|
omap_nand_dma_transfer(mtd, buf, len, 0x0);
|
|
}
|
|
|
|
/**
|
|
* omap_write_buf_dma_pref - write buffer to NAND controller
|
|
* @mtd: MTD device structure
|
|
* @buf: data buffer
|
|
* @len: number of bytes to write
|
|
*/
|
|
static void omap_write_buf_dma_pref(struct mtd_info *mtd,
|
|
const u_char *buf, int len)
|
|
{
|
|
if (len <= mtd->oobsize)
|
|
omap_write_buf_pref(mtd, buf, len);
|
|
else
|
|
/* start transfer in DMA mode */
|
|
omap_nand_dma_transfer(mtd, (u_char *) buf, len, 0x1);
|
|
}
|
|
|
|
/*
|
|
* omap_nand_irq - GPMC irq handler
|
|
* @this_irq: gpmc irq number
|
|
* @dev: omap_nand_info structure pointer is passed here
|
|
*/
|
|
static irqreturn_t omap_nand_irq(int this_irq, void *dev)
|
|
{
|
|
struct omap_nand_info *info = (struct omap_nand_info *) dev;
|
|
u32 bytes;
|
|
|
|
bytes = readl(info->reg.gpmc_prefetch_status);
|
|
bytes = PREFETCH_STATUS_FIFO_CNT(bytes);
|
|
bytes = bytes & 0xFFFC; /* io in multiple of 4 bytes */
|
|
if (info->iomode == OMAP_NAND_IO_WRITE) { /* checks for write io */
|
|
if (this_irq == info->gpmc_irq_count)
|
|
goto done;
|
|
|
|
if (info->buf_len && (info->buf_len < bytes))
|
|
bytes = info->buf_len;
|
|
else if (!info->buf_len)
|
|
bytes = 0;
|
|
iowrite32_rep(info->nand.IO_ADDR_W,
|
|
(u32 *)info->buf, bytes >> 2);
|
|
info->buf = info->buf + bytes;
|
|
info->buf_len -= bytes;
|
|
|
|
} else {
|
|
ioread32_rep(info->nand.IO_ADDR_R,
|
|
(u32 *)info->buf, bytes >> 2);
|
|
info->buf = info->buf + bytes;
|
|
|
|
if (this_irq == info->gpmc_irq_count)
|
|
goto done;
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
done:
|
|
complete(&info->comp);
|
|
|
|
disable_irq_nosync(info->gpmc_irq_fifo);
|
|
disable_irq_nosync(info->gpmc_irq_count);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* omap_read_buf_irq_pref - read data from NAND controller into buffer
|
|
* @mtd: MTD device structure
|
|
* @buf: buffer to store date
|
|
* @len: number of bytes to read
|
|
*/
|
|
static void omap_read_buf_irq_pref(struct mtd_info *mtd, u_char *buf, int len)
|
|
{
|
|
struct omap_nand_info *info = container_of(mtd,
|
|
struct omap_nand_info, mtd);
|
|
int ret = 0;
|
|
|
|
if (len <= mtd->oobsize) {
|
|
omap_read_buf_pref(mtd, buf, len);
|
|
return;
|
|
}
|
|
|
|
info->iomode = OMAP_NAND_IO_READ;
|
|
info->buf = buf;
|
|
init_completion(&info->comp);
|
|
|
|
/* configure and start prefetch transfer */
|
|
ret = omap_prefetch_enable(info->gpmc_cs,
|
|
PREFETCH_FIFOTHRESHOLD_MAX/2, 0x0, len, 0x0, info);
|
|
if (ret)
|
|
/* PFPW engine is busy, use cpu copy method */
|
|
goto out_copy;
|
|
|
|
info->buf_len = len;
|
|
|
|
enable_irq(info->gpmc_irq_count);
|
|
enable_irq(info->gpmc_irq_fifo);
|
|
|
|
/* waiting for read to complete */
|
|
wait_for_completion(&info->comp);
|
|
|
|
/* disable and stop the PFPW engine */
|
|
omap_prefetch_reset(info->gpmc_cs, info);
|
|
return;
|
|
|
|
out_copy:
|
|
if (info->nand.options & NAND_BUSWIDTH_16)
|
|
omap_read_buf16(mtd, buf, len);
|
|
else
|
|
omap_read_buf8(mtd, buf, len);
|
|
}
|
|
|
|
/*
|
|
* omap_write_buf_irq_pref - write buffer to NAND controller
|
|
* @mtd: MTD device structure
|
|
* @buf: data buffer
|
|
* @len: number of bytes to write
|
|
*/
|
|
static void omap_write_buf_irq_pref(struct mtd_info *mtd,
|
|
const u_char *buf, int len)
|
|
{
|
|
struct omap_nand_info *info = container_of(mtd,
|
|
struct omap_nand_info, mtd);
|
|
int ret = 0;
|
|
unsigned long tim, limit;
|
|
u32 val;
|
|
|
|
if (len <= mtd->oobsize) {
|
|
omap_write_buf_pref(mtd, buf, len);
|
|
return;
|
|
}
|
|
|
|
info->iomode = OMAP_NAND_IO_WRITE;
|
|
info->buf = (u_char *) buf;
|
|
init_completion(&info->comp);
|
|
|
|
/* configure and start prefetch transfer : size=24 */
|
|
ret = omap_prefetch_enable(info->gpmc_cs,
|
|
(PREFETCH_FIFOTHRESHOLD_MAX * 3) / 8, 0x0, len, 0x1, info);
|
|
if (ret)
|
|
/* PFPW engine is busy, use cpu copy method */
|
|
goto out_copy;
|
|
|
|
info->buf_len = len;
|
|
|
|
enable_irq(info->gpmc_irq_count);
|
|
enable_irq(info->gpmc_irq_fifo);
|
|
|
|
/* waiting for write to complete */
|
|
wait_for_completion(&info->comp);
|
|
|
|
/* wait for data to flushed-out before reset the prefetch */
|
|
tim = 0;
|
|
limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS));
|
|
do {
|
|
val = readl(info->reg.gpmc_prefetch_status);
|
|
val = PREFETCH_STATUS_COUNT(val);
|
|
cpu_relax();
|
|
} while (val && (tim++ < limit));
|
|
|
|
/* disable and stop the PFPW engine */
|
|
omap_prefetch_reset(info->gpmc_cs, info);
|
|
return;
|
|
|
|
out_copy:
|
|
if (info->nand.options & NAND_BUSWIDTH_16)
|
|
omap_write_buf16(mtd, buf, len);
|
|
else
|
|
omap_write_buf8(mtd, buf, len);
|
|
}
|
|
|
|
/**
|
|
* gen_true_ecc - This function will generate true ECC value
|
|
* @ecc_buf: buffer to store ecc code
|
|
*
|
|
* This generated true ECC value can be used when correcting
|
|
* data read from NAND flash memory core
|
|
*/
|
|
static void gen_true_ecc(u8 *ecc_buf)
|
|
{
|
|
u32 tmp = ecc_buf[0] | (ecc_buf[1] << 16) |
|
|
((ecc_buf[2] & 0xF0) << 20) | ((ecc_buf[2] & 0x0F) << 8);
|
|
|
|
ecc_buf[0] = ~(P64o(tmp) | P64e(tmp) | P32o(tmp) | P32e(tmp) |
|
|
P16o(tmp) | P16e(tmp) | P8o(tmp) | P8e(tmp));
|
|
ecc_buf[1] = ~(P1024o(tmp) | P1024e(tmp) | P512o(tmp) | P512e(tmp) |
|
|
P256o(tmp) | P256e(tmp) | P128o(tmp) | P128e(tmp));
|
|
ecc_buf[2] = ~(P4o(tmp) | P4e(tmp) | P2o(tmp) | P2e(tmp) | P1o(tmp) |
|
|
P1e(tmp) | P2048o(tmp) | P2048e(tmp));
|
|
}
|
|
|
|
/**
|
|
* omap_compare_ecc - Detect (2 bits) and correct (1 bit) error in data
|
|
* @ecc_data1: ecc code from nand spare area
|
|
* @ecc_data2: ecc code from hardware register obtained from hardware ecc
|
|
* @page_data: page data
|
|
*
|
|
* This function compares two ECC's and indicates if there is an error.
|
|
* If the error can be corrected it will be corrected to the buffer.
|
|
* If there is no error, %0 is returned. If there is an error but it
|
|
* was corrected, %1 is returned. Otherwise, %-1 is returned.
|
|
*/
|
|
static int omap_compare_ecc(u8 *ecc_data1, /* read from NAND memory */
|
|
u8 *ecc_data2, /* read from register */
|
|
u8 *page_data)
|
|
{
|
|
uint i;
|
|
u8 tmp0_bit[8], tmp1_bit[8], tmp2_bit[8];
|
|
u8 comp0_bit[8], comp1_bit[8], comp2_bit[8];
|
|
u8 ecc_bit[24];
|
|
u8 ecc_sum = 0;
|
|
u8 find_bit = 0;
|
|
uint find_byte = 0;
|
|
int isEccFF;
|
|
|
|
isEccFF = ((*(u32 *)ecc_data1 & 0xFFFFFF) == 0xFFFFFF);
|
|
|
|
gen_true_ecc(ecc_data1);
|
|
gen_true_ecc(ecc_data2);
|
|
|
|
for (i = 0; i <= 2; i++) {
|
|
*(ecc_data1 + i) = ~(*(ecc_data1 + i));
|
|
*(ecc_data2 + i) = ~(*(ecc_data2 + i));
|
|
}
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
tmp0_bit[i] = *ecc_data1 % 2;
|
|
*ecc_data1 = *ecc_data1 / 2;
|
|
}
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
tmp1_bit[i] = *(ecc_data1 + 1) % 2;
|
|
*(ecc_data1 + 1) = *(ecc_data1 + 1) / 2;
|
|
}
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
tmp2_bit[i] = *(ecc_data1 + 2) % 2;
|
|
*(ecc_data1 + 2) = *(ecc_data1 + 2) / 2;
|
|
}
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
comp0_bit[i] = *ecc_data2 % 2;
|
|
*ecc_data2 = *ecc_data2 / 2;
|
|
}
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
comp1_bit[i] = *(ecc_data2 + 1) % 2;
|
|
*(ecc_data2 + 1) = *(ecc_data2 + 1) / 2;
|
|
}
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
comp2_bit[i] = *(ecc_data2 + 2) % 2;
|
|
*(ecc_data2 + 2) = *(ecc_data2 + 2) / 2;
|
|
}
|
|
|
|
for (i = 0; i < 6; i++)
|
|
ecc_bit[i] = tmp2_bit[i + 2] ^ comp2_bit[i + 2];
|
|
|
|
for (i = 0; i < 8; i++)
|
|
ecc_bit[i + 6] = tmp0_bit[i] ^ comp0_bit[i];
|
|
|
|
for (i = 0; i < 8; i++)
|
|
ecc_bit[i + 14] = tmp1_bit[i] ^ comp1_bit[i];
|
|
|
|
ecc_bit[22] = tmp2_bit[0] ^ comp2_bit[0];
|
|
ecc_bit[23] = tmp2_bit[1] ^ comp2_bit[1];
|
|
|
|
for (i = 0; i < 24; i++)
|
|
ecc_sum += ecc_bit[i];
|
|
|
|
switch (ecc_sum) {
|
|
case 0:
|
|
/* Not reached because this function is not called if
|
|
* ECC values are equal
|
|
*/
|
|
return 0;
|
|
|
|
case 1:
|
|
/* Uncorrectable error */
|
|
pr_debug("ECC UNCORRECTED_ERROR 1\n");
|
|
return -1;
|
|
|
|
case 11:
|
|
/* UN-Correctable error */
|
|
pr_debug("ECC UNCORRECTED_ERROR B\n");
|
|
return -1;
|
|
|
|
case 12:
|
|
/* Correctable error */
|
|
find_byte = (ecc_bit[23] << 8) +
|
|
(ecc_bit[21] << 7) +
|
|
(ecc_bit[19] << 6) +
|
|
(ecc_bit[17] << 5) +
|
|
(ecc_bit[15] << 4) +
|
|
(ecc_bit[13] << 3) +
|
|
(ecc_bit[11] << 2) +
|
|
(ecc_bit[9] << 1) +
|
|
ecc_bit[7];
|
|
|
|
find_bit = (ecc_bit[5] << 2) + (ecc_bit[3] << 1) + ecc_bit[1];
|
|
|
|
pr_debug("Correcting single bit ECC error at offset: "
|
|
"%d, bit: %d\n", find_byte, find_bit);
|
|
|
|
page_data[find_byte] ^= (1 << find_bit);
|
|
|
|
return 1;
|
|
default:
|
|
if (isEccFF) {
|
|
if (ecc_data2[0] == 0 &&
|
|
ecc_data2[1] == 0 &&
|
|
ecc_data2[2] == 0)
|
|
return 0;
|
|
}
|
|
pr_debug("UNCORRECTED_ERROR default\n");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* omap_correct_data - Compares the ECC read with HW generated ECC
|
|
* @mtd: MTD device structure
|
|
* @dat: page data
|
|
* @read_ecc: ecc read from nand flash
|
|
* @calc_ecc: ecc read from HW ECC registers
|
|
*
|
|
* Compares the ecc read from nand spare area with ECC registers values
|
|
* and if ECC's mismatched, it will call 'omap_compare_ecc' for error
|
|
* detection and correction. If there are no errors, %0 is returned. If
|
|
* there were errors and all of the errors were corrected, the number of
|
|
* corrected errors is returned. If uncorrectable errors exist, %-1 is
|
|
* returned.
|
|
*/
|
|
static int omap_correct_data(struct mtd_info *mtd, u_char *dat,
|
|
u_char *read_ecc, u_char *calc_ecc)
|
|
{
|
|
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
|
|
mtd);
|
|
int blockCnt = 0, i = 0, ret = 0;
|
|
int stat = 0;
|
|
|
|
/* Ex NAND_ECC_HW12_2048 */
|
|
if ((info->nand.ecc.mode == NAND_ECC_HW) &&
|
|
(info->nand.ecc.size == 2048))
|
|
blockCnt = 4;
|
|
else
|
|
blockCnt = 1;
|
|
|
|
for (i = 0; i < blockCnt; i++) {
|
|
if (memcmp(read_ecc, calc_ecc, 3) != 0) {
|
|
ret = omap_compare_ecc(read_ecc, calc_ecc, dat);
|
|
if (ret < 0)
|
|
return ret;
|
|
/* keep track of the number of corrected errors */
|
|
stat += ret;
|
|
}
|
|
read_ecc += 3;
|
|
calc_ecc += 3;
|
|
dat += 512;
|
|
}
|
|
return stat;
|
|
}
|
|
|
|
/**
|
|
* omap_calcuate_ecc - Generate non-inverted ECC bytes.
|
|
* @mtd: MTD device structure
|
|
* @dat: The pointer to data on which ecc is computed
|
|
* @ecc_code: The ecc_code buffer
|
|
*
|
|
* Using noninverted ECC can be considered ugly since writing a blank
|
|
* page ie. padding will clear the ECC bytes. This is no problem as long
|
|
* nobody is trying to write data on the seemingly unused page. Reading
|
|
* an erased page will produce an ECC mismatch between generated and read
|
|
* ECC bytes that has to be dealt with separately.
|
|
*/
|
|
static int omap_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
|
|
u_char *ecc_code)
|
|
{
|
|
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
|
|
mtd);
|
|
u32 val;
|
|
|
|
val = readl(info->reg.gpmc_ecc_config);
|
|
if (((val >> ECC_CONFIG_CS_SHIFT) & CS_MASK) != info->gpmc_cs)
|
|
return -EINVAL;
|
|
|
|
/* read ecc result */
|
|
val = readl(info->reg.gpmc_ecc1_result);
|
|
*ecc_code++ = val; /* P128e, ..., P1e */
|
|
*ecc_code++ = val >> 16; /* P128o, ..., P1o */
|
|
/* P2048o, P1024o, P512o, P256o, P2048e, P1024e, P512e, P256e */
|
|
*ecc_code++ = ((val >> 8) & 0x0f) | ((val >> 20) & 0xf0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap_enable_hwecc - This function enables the hardware ecc functionality
|
|
* @mtd: MTD device structure
|
|
* @mode: Read/Write mode
|
|
*/
|
|
static void omap_enable_hwecc(struct mtd_info *mtd, int mode)
|
|
{
|
|
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
|
|
mtd);
|
|
struct nand_chip *chip = mtd->priv;
|
|
unsigned int dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0;
|
|
u32 val;
|
|
|
|
/* clear ecc and enable bits */
|
|
val = ECCCLEAR | ECC1;
|
|
writel(val, info->reg.gpmc_ecc_control);
|
|
|
|
/* program ecc and result sizes */
|
|
val = ((((info->nand.ecc.size >> 1) - 1) << ECCSIZE1_SHIFT) |
|
|
ECC1RESULTSIZE);
|
|
writel(val, info->reg.gpmc_ecc_size_config);
|
|
|
|
switch (mode) {
|
|
case NAND_ECC_READ:
|
|
case NAND_ECC_WRITE:
|
|
writel(ECCCLEAR | ECC1, info->reg.gpmc_ecc_control);
|
|
break;
|
|
case NAND_ECC_READSYN:
|
|
writel(ECCCLEAR, info->reg.gpmc_ecc_control);
|
|
break;
|
|
default:
|
|
dev_info(&info->pdev->dev,
|
|
"error: unrecognized Mode[%d]!\n", mode);
|
|
break;
|
|
}
|
|
|
|
/* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */
|
|
val = (dev_width << 7) | (info->gpmc_cs << 1) | (0x1);
|
|
writel(val, info->reg.gpmc_ecc_config);
|
|
}
|
|
|
|
/**
|
|
* omap_wait - wait until the command is done
|
|
* @mtd: MTD device structure
|
|
* @chip: NAND Chip structure
|
|
*
|
|
* Wait function is called during Program and erase operations and
|
|
* the way it is called from MTD layer, we should wait till the NAND
|
|
* chip is ready after the programming/erase operation has completed.
|
|
*
|
|
* Erase can take up to 400ms and program up to 20ms according to
|
|
* general NAND and SmartMedia specs
|
|
*/
|
|
static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip)
|
|
{
|
|
struct nand_chip *this = mtd->priv;
|
|
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
|
|
mtd);
|
|
unsigned long timeo = jiffies;
|
|
int status, state = this->state;
|
|
|
|
if (state == FL_ERASING)
|
|
timeo += msecs_to_jiffies(400);
|
|
else
|
|
timeo += msecs_to_jiffies(20);
|
|
|
|
writeb(NAND_CMD_STATUS & 0xFF, info->reg.gpmc_nand_command);
|
|
while (time_before(jiffies, timeo)) {
|
|
status = readb(info->reg.gpmc_nand_data);
|
|
if (status & NAND_STATUS_READY)
|
|
break;
|
|
cond_resched();
|
|
}
|
|
|
|
status = readb(info->reg.gpmc_nand_data);
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* omap_dev_ready - calls the platform specific dev_ready function
|
|
* @mtd: MTD device structure
|
|
*/
|
|
static int omap_dev_ready(struct mtd_info *mtd)
|
|
{
|
|
unsigned int val = 0;
|
|
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
|
|
mtd);
|
|
|
|
val = readl(info->reg.gpmc_status);
|
|
|
|
if ((val & 0x100) == 0x100) {
|
|
return 1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* omap_enable_hwecc_bch - Program GPMC to perform BCH ECC calculation
|
|
* @mtd: MTD device structure
|
|
* @mode: Read/Write mode
|
|
*
|
|
* When using BCH with SW correction (i.e. no ELM), sector size is set
|
|
* to 512 bytes and we use BCH_WRAPMODE_6 wrapping mode
|
|
* for both reading and writing with:
|
|
* eccsize0 = 0 (no additional protected byte in spare area)
|
|
* eccsize1 = 32 (skip 32 nibbles = 16 bytes per sector in spare area)
|
|
*/
|
|
static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
|
|
{
|
|
unsigned int bch_type;
|
|
unsigned int dev_width, nsectors;
|
|
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
|
|
mtd);
|
|
enum omap_ecc ecc_opt = info->ecc_opt;
|
|
struct nand_chip *chip = mtd->priv;
|
|
u32 val, wr_mode;
|
|
unsigned int ecc_size1, ecc_size0;
|
|
|
|
/* GPMC configurations for calculating ECC */
|
|
switch (ecc_opt) {
|
|
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
|
|
bch_type = 0;
|
|
nsectors = 1;
|
|
wr_mode = BCH_WRAPMODE_6;
|
|
ecc_size0 = BCH_ECC_SIZE0;
|
|
ecc_size1 = BCH_ECC_SIZE1;
|
|
break;
|
|
case OMAP_ECC_BCH4_CODE_HW:
|
|
bch_type = 0;
|
|
nsectors = chip->ecc.steps;
|
|
if (mode == NAND_ECC_READ) {
|
|
wr_mode = BCH_WRAPMODE_1;
|
|
ecc_size0 = BCH4R_ECC_SIZE0;
|
|
ecc_size1 = BCH4R_ECC_SIZE1;
|
|
} else {
|
|
wr_mode = BCH_WRAPMODE_6;
|
|
ecc_size0 = BCH_ECC_SIZE0;
|
|
ecc_size1 = BCH_ECC_SIZE1;
|
|
}
|
|
break;
|
|
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
|
|
bch_type = 1;
|
|
nsectors = 1;
|
|
wr_mode = BCH_WRAPMODE_6;
|
|
ecc_size0 = BCH_ECC_SIZE0;
|
|
ecc_size1 = BCH_ECC_SIZE1;
|
|
break;
|
|
case OMAP_ECC_BCH8_CODE_HW:
|
|
bch_type = 1;
|
|
nsectors = chip->ecc.steps;
|
|
if (mode == NAND_ECC_READ) {
|
|
wr_mode = BCH_WRAPMODE_1;
|
|
ecc_size0 = BCH8R_ECC_SIZE0;
|
|
ecc_size1 = BCH8R_ECC_SIZE1;
|
|
} else {
|
|
wr_mode = BCH_WRAPMODE_6;
|
|
ecc_size0 = BCH_ECC_SIZE0;
|
|
ecc_size1 = BCH_ECC_SIZE1;
|
|
}
|
|
break;
|
|
case OMAP_ECC_BCH16_CODE_HW:
|
|
bch_type = 0x2;
|
|
nsectors = chip->ecc.steps;
|
|
if (mode == NAND_ECC_READ) {
|
|
wr_mode = 0x01;
|
|
ecc_size0 = 52; /* ECC bits in nibbles per sector */
|
|
ecc_size1 = 0; /* non-ECC bits in nibbles per sector */
|
|
} else {
|
|
wr_mode = 0x01;
|
|
ecc_size0 = 0; /* extra bits in nibbles per sector */
|
|
ecc_size1 = 52; /* OOB bits in nibbles per sector */
|
|
}
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
writel(ECC1, info->reg.gpmc_ecc_control);
|
|
|
|
/* Configure ecc size for BCH */
|
|
val = (ecc_size1 << ECCSIZE1_SHIFT) | (ecc_size0 << ECCSIZE0_SHIFT);
|
|
writel(val, info->reg.gpmc_ecc_size_config);
|
|
|
|
dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0;
|
|
|
|
/* BCH configuration */
|
|
val = ((1 << 16) | /* enable BCH */
|
|
(bch_type << 12) | /* BCH4/BCH8/BCH16 */
|
|
(wr_mode << 8) | /* wrap mode */
|
|
(dev_width << 7) | /* bus width */
|
|
(((nsectors-1) & 0x7) << 4) | /* number of sectors */
|
|
(info->gpmc_cs << 1) | /* ECC CS */
|
|
(0x1)); /* enable ECC */
|
|
|
|
writel(val, info->reg.gpmc_ecc_config);
|
|
|
|
/* Clear ecc and enable bits */
|
|
writel(ECCCLEAR | ECC1, info->reg.gpmc_ecc_control);
|
|
}
|
|
|
|
static u8 bch4_polynomial[] = {0x28, 0x13, 0xcc, 0x39, 0x96, 0xac, 0x7f};
|
|
static u8 bch8_polynomial[] = {0xef, 0x51, 0x2e, 0x09, 0xed, 0x93, 0x9a, 0xc2,
|
|
0x97, 0x79, 0xe5, 0x24, 0xb5};
|
|
|
|
/**
|
|
* omap_calculate_ecc_bch - Generate bytes of ECC bytes
|
|
* @mtd: MTD device structure
|
|
* @dat: The pointer to data on which ecc is computed
|
|
* @ecc_code: The ecc_code buffer
|
|
*
|
|
* Support calculating of BCH4/8 ecc vectors for the page
|
|
*/
|
|
static int __maybe_unused omap_calculate_ecc_bch(struct mtd_info *mtd,
|
|
const u_char *dat, u_char *ecc_calc)
|
|
{
|
|
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
|
|
mtd);
|
|
int eccbytes = info->nand.ecc.bytes;
|
|
struct gpmc_nand_regs *gpmc_regs = &info->reg;
|
|
u8 *ecc_code;
|
|
unsigned long nsectors, bch_val1, bch_val2, bch_val3, bch_val4;
|
|
u32 val;
|
|
int i, j;
|
|
|
|
nsectors = ((readl(info->reg.gpmc_ecc_config) >> 4) & 0x7) + 1;
|
|
for (i = 0; i < nsectors; i++) {
|
|
ecc_code = ecc_calc;
|
|
switch (info->ecc_opt) {
|
|
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
|
|
case OMAP_ECC_BCH8_CODE_HW:
|
|
bch_val1 = readl(gpmc_regs->gpmc_bch_result0[i]);
|
|
bch_val2 = readl(gpmc_regs->gpmc_bch_result1[i]);
|
|
bch_val3 = readl(gpmc_regs->gpmc_bch_result2[i]);
|
|
bch_val4 = readl(gpmc_regs->gpmc_bch_result3[i]);
|
|
*ecc_code++ = (bch_val4 & 0xFF);
|
|
*ecc_code++ = ((bch_val3 >> 24) & 0xFF);
|
|
*ecc_code++ = ((bch_val3 >> 16) & 0xFF);
|
|
*ecc_code++ = ((bch_val3 >> 8) & 0xFF);
|
|
*ecc_code++ = (bch_val3 & 0xFF);
|
|
*ecc_code++ = ((bch_val2 >> 24) & 0xFF);
|
|
*ecc_code++ = ((bch_val2 >> 16) & 0xFF);
|
|
*ecc_code++ = ((bch_val2 >> 8) & 0xFF);
|
|
*ecc_code++ = (bch_val2 & 0xFF);
|
|
*ecc_code++ = ((bch_val1 >> 24) & 0xFF);
|
|
*ecc_code++ = ((bch_val1 >> 16) & 0xFF);
|
|
*ecc_code++ = ((bch_val1 >> 8) & 0xFF);
|
|
*ecc_code++ = (bch_val1 & 0xFF);
|
|
break;
|
|
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
|
|
case OMAP_ECC_BCH4_CODE_HW:
|
|
bch_val1 = readl(gpmc_regs->gpmc_bch_result0[i]);
|
|
bch_val2 = readl(gpmc_regs->gpmc_bch_result1[i]);
|
|
*ecc_code++ = ((bch_val2 >> 12) & 0xFF);
|
|
*ecc_code++ = ((bch_val2 >> 4) & 0xFF);
|
|
*ecc_code++ = ((bch_val2 & 0xF) << 4) |
|
|
((bch_val1 >> 28) & 0xF);
|
|
*ecc_code++ = ((bch_val1 >> 20) & 0xFF);
|
|
*ecc_code++ = ((bch_val1 >> 12) & 0xFF);
|
|
*ecc_code++ = ((bch_val1 >> 4) & 0xFF);
|
|
*ecc_code++ = ((bch_val1 & 0xF) << 4);
|
|
break;
|
|
case OMAP_ECC_BCH16_CODE_HW:
|
|
val = readl(gpmc_regs->gpmc_bch_result6[i]);
|
|
ecc_code[0] = ((val >> 8) & 0xFF);
|
|
ecc_code[1] = ((val >> 0) & 0xFF);
|
|
val = readl(gpmc_regs->gpmc_bch_result5[i]);
|
|
ecc_code[2] = ((val >> 24) & 0xFF);
|
|
ecc_code[3] = ((val >> 16) & 0xFF);
|
|
ecc_code[4] = ((val >> 8) & 0xFF);
|
|
ecc_code[5] = ((val >> 0) & 0xFF);
|
|
val = readl(gpmc_regs->gpmc_bch_result4[i]);
|
|
ecc_code[6] = ((val >> 24) & 0xFF);
|
|
ecc_code[7] = ((val >> 16) & 0xFF);
|
|
ecc_code[8] = ((val >> 8) & 0xFF);
|
|
ecc_code[9] = ((val >> 0) & 0xFF);
|
|
val = readl(gpmc_regs->gpmc_bch_result3[i]);
|
|
ecc_code[10] = ((val >> 24) & 0xFF);
|
|
ecc_code[11] = ((val >> 16) & 0xFF);
|
|
ecc_code[12] = ((val >> 8) & 0xFF);
|
|
ecc_code[13] = ((val >> 0) & 0xFF);
|
|
val = readl(gpmc_regs->gpmc_bch_result2[i]);
|
|
ecc_code[14] = ((val >> 24) & 0xFF);
|
|
ecc_code[15] = ((val >> 16) & 0xFF);
|
|
ecc_code[16] = ((val >> 8) & 0xFF);
|
|
ecc_code[17] = ((val >> 0) & 0xFF);
|
|
val = readl(gpmc_regs->gpmc_bch_result1[i]);
|
|
ecc_code[18] = ((val >> 24) & 0xFF);
|
|
ecc_code[19] = ((val >> 16) & 0xFF);
|
|
ecc_code[20] = ((val >> 8) & 0xFF);
|
|
ecc_code[21] = ((val >> 0) & 0xFF);
|
|
val = readl(gpmc_regs->gpmc_bch_result0[i]);
|
|
ecc_code[22] = ((val >> 24) & 0xFF);
|
|
ecc_code[23] = ((val >> 16) & 0xFF);
|
|
ecc_code[24] = ((val >> 8) & 0xFF);
|
|
ecc_code[25] = ((val >> 0) & 0xFF);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* ECC scheme specific syndrome customizations */
|
|
switch (info->ecc_opt) {
|
|
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
|
|
/* Add constant polynomial to remainder, so that
|
|
* ECC of blank pages results in 0x0 on reading back */
|
|
for (j = 0; j < eccbytes; j++)
|
|
ecc_calc[j] ^= bch4_polynomial[j];
|
|
break;
|
|
case OMAP_ECC_BCH4_CODE_HW:
|
|
/* Set 8th ECC byte as 0x0 for ROM compatibility */
|
|
ecc_calc[eccbytes - 1] = 0x0;
|
|
break;
|
|
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
|
|
/* Add constant polynomial to remainder, so that
|
|
* ECC of blank pages results in 0x0 on reading back */
|
|
for (j = 0; j < eccbytes; j++)
|
|
ecc_calc[j] ^= bch8_polynomial[j];
|
|
break;
|
|
case OMAP_ECC_BCH8_CODE_HW:
|
|
/* Set 14th ECC byte as 0x0 for ROM compatibility */
|
|
ecc_calc[eccbytes - 1] = 0x0;
|
|
break;
|
|
case OMAP_ECC_BCH16_CODE_HW:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
ecc_calc += eccbytes;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* erased_sector_bitflips - count bit flips
|
|
* @data: data sector buffer
|
|
* @oob: oob buffer
|
|
* @info: omap_nand_info
|
|
*
|
|
* Check the bit flips in erased page falls below correctable level.
|
|
* If falls below, report the page as erased with correctable bit
|
|
* flip, else report as uncorrectable page.
|
|
*/
|
|
static int erased_sector_bitflips(u_char *data, u_char *oob,
|
|
struct omap_nand_info *info)
|
|
{
|
|
int flip_bits = 0, i;
|
|
|
|
for (i = 0; i < info->nand.ecc.size; i++) {
|
|
flip_bits += hweight8(~data[i]);
|
|
if (flip_bits > info->nand.ecc.strength)
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < info->nand.ecc.bytes - 1; i++) {
|
|
flip_bits += hweight8(~oob[i]);
|
|
if (flip_bits > info->nand.ecc.strength)
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Bit flips falls in correctable level.
|
|
* Fill data area with 0xFF
|
|
*/
|
|
if (flip_bits) {
|
|
memset(data, 0xFF, info->nand.ecc.size);
|
|
memset(oob, 0xFF, info->nand.ecc.bytes);
|
|
}
|
|
|
|
return flip_bits;
|
|
}
|
|
|
|
/**
|
|
* omap_elm_correct_data - corrects page data area in case error reported
|
|
* @mtd: MTD device structure
|
|
* @data: page data
|
|
* @read_ecc: ecc read from nand flash
|
|
* @calc_ecc: ecc read from HW ECC registers
|
|
*
|
|
* Calculated ecc vector reported as zero in case of non-error pages.
|
|
* In case of non-zero ecc vector, first filter out erased-pages, and
|
|
* then process data via ELM to detect bit-flips.
|
|
*/
|
|
static int omap_elm_correct_data(struct mtd_info *mtd, u_char *data,
|
|
u_char *read_ecc, u_char *calc_ecc)
|
|
{
|
|
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
|
|
mtd);
|
|
struct nand_ecc_ctrl *ecc = &info->nand.ecc;
|
|
int eccsteps = info->nand.ecc.steps;
|
|
int i , j, stat = 0;
|
|
int eccflag, actual_eccbytes;
|
|
struct elm_errorvec err_vec[ERROR_VECTOR_MAX];
|
|
u_char *ecc_vec = calc_ecc;
|
|
u_char *spare_ecc = read_ecc;
|
|
u_char *erased_ecc_vec;
|
|
u_char *buf;
|
|
int bitflip_count;
|
|
bool is_error_reported = false;
|
|
u32 bit_pos, byte_pos, error_max, pos;
|
|
int err;
|
|
|
|
switch (info->ecc_opt) {
|
|
case OMAP_ECC_BCH4_CODE_HW:
|
|
/* omit 7th ECC byte reserved for ROM code compatibility */
|
|
actual_eccbytes = ecc->bytes - 1;
|
|
erased_ecc_vec = bch4_vector;
|
|
break;
|
|
case OMAP_ECC_BCH8_CODE_HW:
|
|
/* omit 14th ECC byte reserved for ROM code compatibility */
|
|
actual_eccbytes = ecc->bytes - 1;
|
|
erased_ecc_vec = bch8_vector;
|
|
break;
|
|
case OMAP_ECC_BCH16_CODE_HW:
|
|
actual_eccbytes = ecc->bytes;
|
|
erased_ecc_vec = bch16_vector;
|
|
break;
|
|
default:
|
|
dev_err(&info->pdev->dev, "invalid driver configuration\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Initialize elm error vector to zero */
|
|
memset(err_vec, 0, sizeof(err_vec));
|
|
|
|
for (i = 0; i < eccsteps ; i++) {
|
|
eccflag = 0; /* initialize eccflag */
|
|
|
|
/*
|
|
* Check any error reported,
|
|
* In case of error, non zero ecc reported.
|
|
*/
|
|
for (j = 0; j < actual_eccbytes; j++) {
|
|
if (calc_ecc[j] != 0) {
|
|
eccflag = 1; /* non zero ecc, error present */
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (eccflag == 1) {
|
|
if (memcmp(calc_ecc, erased_ecc_vec,
|
|
actual_eccbytes) == 0) {
|
|
/*
|
|
* calc_ecc[] matches pattern for ECC(all 0xff)
|
|
* so this is definitely an erased-page
|
|
*/
|
|
} else {
|
|
buf = &data[info->nand.ecc.size * i];
|
|
/*
|
|
* count number of 0-bits in read_buf.
|
|
* This check can be removed once a similar
|
|
* check is introduced in generic NAND driver
|
|
*/
|
|
bitflip_count = erased_sector_bitflips(
|
|
buf, read_ecc, info);
|
|
if (bitflip_count) {
|
|
/*
|
|
* number of 0-bits within ECC limits
|
|
* So this may be an erased-page
|
|
*/
|
|
stat += bitflip_count;
|
|
} else {
|
|
/*
|
|
* Too many 0-bits. It may be a
|
|
* - programmed-page, OR
|
|
* - erased-page with many bit-flips
|
|
* So this page requires check by ELM
|
|
*/
|
|
err_vec[i].error_reported = true;
|
|
is_error_reported = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Update the ecc vector */
|
|
calc_ecc += ecc->bytes;
|
|
read_ecc += ecc->bytes;
|
|
}
|
|
|
|
/* Check if any error reported */
|
|
if (!is_error_reported)
|
|
return stat;
|
|
|
|
/* Decode BCH error using ELM module */
|
|
elm_decode_bch_error_page(info->elm_dev, ecc_vec, err_vec);
|
|
|
|
err = 0;
|
|
for (i = 0; i < eccsteps; i++) {
|
|
if (err_vec[i].error_uncorrectable) {
|
|
dev_err(&info->pdev->dev,
|
|
"uncorrectable bit-flips found\n");
|
|
err = -EBADMSG;
|
|
} else if (err_vec[i].error_reported) {
|
|
for (j = 0; j < err_vec[i].error_count; j++) {
|
|
switch (info->ecc_opt) {
|
|
case OMAP_ECC_BCH4_CODE_HW:
|
|
/* Add 4 bits to take care of padding */
|
|
pos = err_vec[i].error_loc[j] +
|
|
BCH4_BIT_PAD;
|
|
break;
|
|
case OMAP_ECC_BCH8_CODE_HW:
|
|
case OMAP_ECC_BCH16_CODE_HW:
|
|
pos = err_vec[i].error_loc[j];
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
error_max = (ecc->size + actual_eccbytes) * 8;
|
|
/* Calculate bit position of error */
|
|
bit_pos = pos % 8;
|
|
|
|
/* Calculate byte position of error */
|
|
byte_pos = (error_max - pos - 1) / 8;
|
|
|
|
if (pos < error_max) {
|
|
if (byte_pos < 512) {
|
|
pr_debug("bitflip@dat[%d]=%x\n",
|
|
byte_pos, data[byte_pos]);
|
|
data[byte_pos] ^= 1 << bit_pos;
|
|
} else {
|
|
pr_debug("bitflip@oob[%d]=%x\n",
|
|
(byte_pos - 512),
|
|
spare_ecc[byte_pos - 512]);
|
|
spare_ecc[byte_pos - 512] ^=
|
|
1 << bit_pos;
|
|
}
|
|
} else {
|
|
dev_err(&info->pdev->dev,
|
|
"invalid bit-flip @ %d:%d\n",
|
|
byte_pos, bit_pos);
|
|
err = -EBADMSG;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Update number of correctable errors */
|
|
stat += err_vec[i].error_count;
|
|
|
|
/* Update page data with sector size */
|
|
data += ecc->size;
|
|
spare_ecc += ecc->bytes;
|
|
}
|
|
|
|
return (err) ? err : stat;
|
|
}
|
|
|
|
/**
|
|
* omap_write_page_bch - BCH ecc based write page function for entire page
|
|
* @mtd: mtd info structure
|
|
* @chip: nand chip info structure
|
|
* @buf: data buffer
|
|
* @oob_required: must write chip->oob_poi to OOB
|
|
* @page: page
|
|
*
|
|
* Custom write page method evolved to support multi sector writing in one shot
|
|
*/
|
|
static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
|
|
const uint8_t *buf, int oob_required, int page)
|
|
{
|
|
int i;
|
|
uint8_t *ecc_calc = chip->buffers->ecccalc;
|
|
uint32_t *eccpos = chip->ecc.layout->eccpos;
|
|
|
|
/* Enable GPMC ecc engine */
|
|
chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
|
|
|
|
/* Write data */
|
|
chip->write_buf(mtd, buf, mtd->writesize);
|
|
|
|
/* Update ecc vector from GPMC result registers */
|
|
chip->ecc.calculate(mtd, buf, &ecc_calc[0]);
|
|
|
|
for (i = 0; i < chip->ecc.total; i++)
|
|
chip->oob_poi[eccpos[i]] = ecc_calc[i];
|
|
|
|
/* Write ecc vector to OOB area */
|
|
chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap_read_page_bch - BCH ecc based page read function for entire page
|
|
* @mtd: mtd info structure
|
|
* @chip: nand chip info structure
|
|
* @buf: buffer to store read data
|
|
* @oob_required: caller requires OOB data read to chip->oob_poi
|
|
* @page: page number to read
|
|
*
|
|
* For BCH ecc scheme, GPMC used for syndrome calculation and ELM module
|
|
* used for error correction.
|
|
* Custom method evolved to support ELM error correction & multi sector
|
|
* reading. On reading page data area is read along with OOB data with
|
|
* ecc engine enabled. ecc vector updated after read of OOB data.
|
|
* For non error pages ecc vector reported as zero.
|
|
*/
|
|
static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
|
|
uint8_t *buf, int oob_required, int page)
|
|
{
|
|
uint8_t *ecc_calc = chip->buffers->ecccalc;
|
|
uint8_t *ecc_code = chip->buffers->ecccode;
|
|
uint32_t *eccpos = chip->ecc.layout->eccpos;
|
|
uint8_t *oob = &chip->oob_poi[eccpos[0]];
|
|
uint32_t oob_pos = mtd->writesize + chip->ecc.layout->eccpos[0];
|
|
int stat;
|
|
unsigned int max_bitflips = 0;
|
|
|
|
/* Enable GPMC ecc engine */
|
|
chip->ecc.hwctl(mtd, NAND_ECC_READ);
|
|
|
|
/* Read data */
|
|
chip->read_buf(mtd, buf, mtd->writesize);
|
|
|
|
/* Read oob bytes */
|
|
chip->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_pos, -1);
|
|
chip->read_buf(mtd, oob, chip->ecc.total);
|
|
|
|
/* Calculate ecc bytes */
|
|
chip->ecc.calculate(mtd, buf, ecc_calc);
|
|
|
|
memcpy(ecc_code, &chip->oob_poi[eccpos[0]], chip->ecc.total);
|
|
|
|
stat = chip->ecc.correct(mtd, buf, ecc_code, ecc_calc);
|
|
|
|
if (stat < 0) {
|
|
mtd->ecc_stats.failed++;
|
|
} else {
|
|
mtd->ecc_stats.corrected += stat;
|
|
max_bitflips = max_t(unsigned int, max_bitflips, stat);
|
|
}
|
|
|
|
return max_bitflips;
|
|
}
|
|
|
|
/**
|
|
* is_elm_present - checks for presence of ELM module by scanning DT nodes
|
|
* @omap_nand_info: NAND device structure containing platform data
|
|
*/
|
|
static bool is_elm_present(struct omap_nand_info *info,
|
|
struct device_node *elm_node)
|
|
{
|
|
struct platform_device *pdev;
|
|
|
|
/* check whether elm-id is passed via DT */
|
|
if (!elm_node) {
|
|
dev_err(&info->pdev->dev, "ELM devicetree node not found\n");
|
|
return false;
|
|
}
|
|
pdev = of_find_device_by_node(elm_node);
|
|
/* check whether ELM device is registered */
|
|
if (!pdev) {
|
|
dev_err(&info->pdev->dev, "ELM device not found\n");
|
|
return false;
|
|
}
|
|
/* ELM module available, now configure it */
|
|
info->elm_dev = &pdev->dev;
|
|
return true;
|
|
}
|
|
|
|
static bool omap2_nand_ecc_check(struct omap_nand_info *info,
|
|
struct omap_nand_platform_data *pdata)
|
|
{
|
|
bool ecc_needs_bch, ecc_needs_omap_bch, ecc_needs_elm;
|
|
|
|
switch (info->ecc_opt) {
|
|
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
|
|
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
|
|
ecc_needs_omap_bch = false;
|
|
ecc_needs_bch = true;
|
|
ecc_needs_elm = false;
|
|
break;
|
|
case OMAP_ECC_BCH4_CODE_HW:
|
|
case OMAP_ECC_BCH8_CODE_HW:
|
|
case OMAP_ECC_BCH16_CODE_HW:
|
|
ecc_needs_omap_bch = true;
|
|
ecc_needs_bch = false;
|
|
ecc_needs_elm = true;
|
|
break;
|
|
default:
|
|
ecc_needs_omap_bch = false;
|
|
ecc_needs_bch = false;
|
|
ecc_needs_elm = false;
|
|
break;
|
|
}
|
|
|
|
if (ecc_needs_bch && !IS_ENABLED(CONFIG_MTD_NAND_ECC_BCH)) {
|
|
dev_err(&info->pdev->dev,
|
|
"CONFIG_MTD_NAND_ECC_BCH not enabled\n");
|
|
return false;
|
|
}
|
|
if (ecc_needs_omap_bch && !IS_ENABLED(CONFIG_MTD_NAND_OMAP_BCH)) {
|
|
dev_err(&info->pdev->dev,
|
|
"CONFIG_MTD_NAND_OMAP_BCH not enabled\n");
|
|
return false;
|
|
}
|
|
if (ecc_needs_elm && !is_elm_present(info, pdata->elm_of_node)) {
|
|
dev_err(&info->pdev->dev, "ELM not available\n");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int omap_nand_probe(struct platform_device *pdev)
|
|
{
|
|
struct omap_nand_info *info;
|
|
struct omap_nand_platform_data *pdata;
|
|
struct mtd_info *mtd;
|
|
struct nand_chip *nand_chip;
|
|
struct nand_ecclayout *ecclayout;
|
|
int err;
|
|
int i;
|
|
dma_cap_mask_t mask;
|
|
unsigned sig;
|
|
unsigned oob_index;
|
|
struct resource *res;
|
|
struct mtd_part_parser_data ppdata = {};
|
|
|
|
pdata = dev_get_platdata(&pdev->dev);
|
|
if (pdata == NULL) {
|
|
dev_err(&pdev->dev, "platform data missing\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
info = devm_kzalloc(&pdev->dev, sizeof(struct omap_nand_info),
|
|
GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, info);
|
|
|
|
info->pdev = pdev;
|
|
info->gpmc_cs = pdata->cs;
|
|
info->reg = pdata->reg;
|
|
info->of_node = pdata->of_node;
|
|
info->ecc_opt = pdata->ecc_opt;
|
|
mtd = &info->mtd;
|
|
mtd->priv = &info->nand;
|
|
mtd->dev.parent = &pdev->dev;
|
|
nand_chip = &info->nand;
|
|
nand_chip->ecc.priv = NULL;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
nand_chip->IO_ADDR_R = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(nand_chip->IO_ADDR_R))
|
|
return PTR_ERR(nand_chip->IO_ADDR_R);
|
|
|
|
info->phys_base = res->start;
|
|
|
|
nand_chip->controller = &omap_gpmc_controller;
|
|
|
|
nand_chip->IO_ADDR_W = nand_chip->IO_ADDR_R;
|
|
nand_chip->cmd_ctrl = omap_hwcontrol;
|
|
|
|
/*
|
|
* If RDY/BSY line is connected to OMAP then use the omap ready
|
|
* function and the generic nand_wait function which reads the status
|
|
* register after monitoring the RDY/BSY line. Otherwise use a standard
|
|
* chip delay which is slightly more than tR (AC Timing) of the NAND
|
|
* device and read status register until you get a failure or success
|
|
*/
|
|
if (pdata->dev_ready) {
|
|
nand_chip->dev_ready = omap_dev_ready;
|
|
nand_chip->chip_delay = 0;
|
|
} else {
|
|
nand_chip->waitfunc = omap_wait;
|
|
nand_chip->chip_delay = 50;
|
|
}
|
|
|
|
if (pdata->flash_bbt)
|
|
nand_chip->bbt_options |= NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
|
|
else
|
|
nand_chip->options |= NAND_SKIP_BBTSCAN;
|
|
|
|
/* scan NAND device connected to chip controller */
|
|
nand_chip->options |= pdata->devsize & NAND_BUSWIDTH_16;
|
|
if (nand_scan_ident(mtd, 1, NULL)) {
|
|
dev_err(&info->pdev->dev, "scan failed, may be bus-width mismatch\n");
|
|
err = -ENXIO;
|
|
goto return_error;
|
|
}
|
|
|
|
/* re-populate low-level callbacks based on xfer modes */
|
|
switch (pdata->xfer_type) {
|
|
case NAND_OMAP_PREFETCH_POLLED:
|
|
nand_chip->read_buf = omap_read_buf_pref;
|
|
nand_chip->write_buf = omap_write_buf_pref;
|
|
break;
|
|
|
|
case NAND_OMAP_POLLED:
|
|
/* Use nand_base defaults for {read,write}_buf */
|
|
break;
|
|
|
|
case NAND_OMAP_PREFETCH_DMA:
|
|
dma_cap_zero(mask);
|
|
dma_cap_set(DMA_SLAVE, mask);
|
|
sig = OMAP24XX_DMA_GPMC;
|
|
info->dma = dma_request_channel(mask, omap_dma_filter_fn, &sig);
|
|
if (!info->dma) {
|
|
dev_err(&pdev->dev, "DMA engine request failed\n");
|
|
err = -ENXIO;
|
|
goto return_error;
|
|
} else {
|
|
struct dma_slave_config cfg;
|
|
|
|
memset(&cfg, 0, sizeof(cfg));
|
|
cfg.src_addr = info->phys_base;
|
|
cfg.dst_addr = info->phys_base;
|
|
cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
cfg.src_maxburst = 16;
|
|
cfg.dst_maxburst = 16;
|
|
err = dmaengine_slave_config(info->dma, &cfg);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "DMA engine slave config failed: %d\n",
|
|
err);
|
|
goto return_error;
|
|
}
|
|
nand_chip->read_buf = omap_read_buf_dma_pref;
|
|
nand_chip->write_buf = omap_write_buf_dma_pref;
|
|
}
|
|
break;
|
|
|
|
case NAND_OMAP_PREFETCH_IRQ:
|
|
info->gpmc_irq_fifo = platform_get_irq(pdev, 0);
|
|
if (info->gpmc_irq_fifo <= 0) {
|
|
dev_err(&pdev->dev, "error getting fifo irq\n");
|
|
err = -ENODEV;
|
|
goto return_error;
|
|
}
|
|
err = devm_request_irq(&pdev->dev, info->gpmc_irq_fifo,
|
|
omap_nand_irq, IRQF_SHARED,
|
|
"gpmc-nand-fifo", info);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "requesting irq(%d) error:%d",
|
|
info->gpmc_irq_fifo, err);
|
|
info->gpmc_irq_fifo = 0;
|
|
goto return_error;
|
|
}
|
|
|
|
info->gpmc_irq_count = platform_get_irq(pdev, 1);
|
|
if (info->gpmc_irq_count <= 0) {
|
|
dev_err(&pdev->dev, "error getting count irq\n");
|
|
err = -ENODEV;
|
|
goto return_error;
|
|
}
|
|
err = devm_request_irq(&pdev->dev, info->gpmc_irq_count,
|
|
omap_nand_irq, IRQF_SHARED,
|
|
"gpmc-nand-count", info);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "requesting irq(%d) error:%d",
|
|
info->gpmc_irq_count, err);
|
|
info->gpmc_irq_count = 0;
|
|
goto return_error;
|
|
}
|
|
|
|
nand_chip->read_buf = omap_read_buf_irq_pref;
|
|
nand_chip->write_buf = omap_write_buf_irq_pref;
|
|
|
|
break;
|
|
|
|
default:
|
|
dev_err(&pdev->dev,
|
|
"xfer_type(%d) not supported!\n", pdata->xfer_type);
|
|
err = -EINVAL;
|
|
goto return_error;
|
|
}
|
|
|
|
if (!omap2_nand_ecc_check(info, pdata)) {
|
|
err = -EINVAL;
|
|
goto return_error;
|
|
}
|
|
|
|
/* populate MTD interface based on ECC scheme */
|
|
ecclayout = &info->oobinfo;
|
|
switch (info->ecc_opt) {
|
|
case OMAP_ECC_HAM1_CODE_SW:
|
|
nand_chip->ecc.mode = NAND_ECC_SOFT;
|
|
break;
|
|
|
|
case OMAP_ECC_HAM1_CODE_HW:
|
|
pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n");
|
|
nand_chip->ecc.mode = NAND_ECC_HW;
|
|
nand_chip->ecc.bytes = 3;
|
|
nand_chip->ecc.size = 512;
|
|
nand_chip->ecc.strength = 1;
|
|
nand_chip->ecc.calculate = omap_calculate_ecc;
|
|
nand_chip->ecc.hwctl = omap_enable_hwecc;
|
|
nand_chip->ecc.correct = omap_correct_data;
|
|
/* define ECC layout */
|
|
ecclayout->eccbytes = nand_chip->ecc.bytes *
|
|
(mtd->writesize /
|
|
nand_chip->ecc.size);
|
|
if (nand_chip->options & NAND_BUSWIDTH_16)
|
|
oob_index = BADBLOCK_MARKER_LENGTH;
|
|
else
|
|
oob_index = 1;
|
|
for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
|
|
ecclayout->eccpos[i] = oob_index;
|
|
/* no reserved-marker in ecclayout for this ecc-scheme */
|
|
ecclayout->oobfree->offset =
|
|
ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
|
|
break;
|
|
|
|
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
|
|
pr_info("nand: using OMAP_ECC_BCH4_CODE_HW_DETECTION_SW\n");
|
|
nand_chip->ecc.mode = NAND_ECC_HW;
|
|
nand_chip->ecc.size = 512;
|
|
nand_chip->ecc.bytes = 7;
|
|
nand_chip->ecc.strength = 4;
|
|
nand_chip->ecc.hwctl = omap_enable_hwecc_bch;
|
|
nand_chip->ecc.correct = nand_bch_correct_data;
|
|
nand_chip->ecc.calculate = omap_calculate_ecc_bch;
|
|
/* define ECC layout */
|
|
ecclayout->eccbytes = nand_chip->ecc.bytes *
|
|
(mtd->writesize /
|
|
nand_chip->ecc.size);
|
|
oob_index = BADBLOCK_MARKER_LENGTH;
|
|
for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
|
|
ecclayout->eccpos[i] = oob_index;
|
|
if (((i + 1) % nand_chip->ecc.bytes) == 0)
|
|
oob_index++;
|
|
}
|
|
/* include reserved-marker in ecclayout->oobfree calculation */
|
|
ecclayout->oobfree->offset = 1 +
|
|
ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
|
|
/* software bch library is used for locating errors */
|
|
nand_chip->ecc.priv = nand_bch_init(mtd,
|
|
nand_chip->ecc.size,
|
|
nand_chip->ecc.bytes,
|
|
&ecclayout);
|
|
if (!nand_chip->ecc.priv) {
|
|
dev_err(&info->pdev->dev, "unable to use BCH library\n");
|
|
err = -EINVAL;
|
|
goto return_error;
|
|
}
|
|
break;
|
|
|
|
case OMAP_ECC_BCH4_CODE_HW:
|
|
pr_info("nand: using OMAP_ECC_BCH4_CODE_HW ECC scheme\n");
|
|
nand_chip->ecc.mode = NAND_ECC_HW;
|
|
nand_chip->ecc.size = 512;
|
|
/* 14th bit is kept reserved for ROM-code compatibility */
|
|
nand_chip->ecc.bytes = 7 + 1;
|
|
nand_chip->ecc.strength = 4;
|
|
nand_chip->ecc.hwctl = omap_enable_hwecc_bch;
|
|
nand_chip->ecc.correct = omap_elm_correct_data;
|
|
nand_chip->ecc.calculate = omap_calculate_ecc_bch;
|
|
nand_chip->ecc.read_page = omap_read_page_bch;
|
|
nand_chip->ecc.write_page = omap_write_page_bch;
|
|
/* define ECC layout */
|
|
ecclayout->eccbytes = nand_chip->ecc.bytes *
|
|
(mtd->writesize /
|
|
nand_chip->ecc.size);
|
|
oob_index = BADBLOCK_MARKER_LENGTH;
|
|
for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
|
|
ecclayout->eccpos[i] = oob_index;
|
|
/* reserved marker already included in ecclayout->eccbytes */
|
|
ecclayout->oobfree->offset =
|
|
ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
|
|
|
|
err = elm_config(info->elm_dev, BCH4_ECC,
|
|
info->mtd.writesize / nand_chip->ecc.size,
|
|
nand_chip->ecc.size, nand_chip->ecc.bytes);
|
|
if (err < 0)
|
|
goto return_error;
|
|
break;
|
|
|
|
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
|
|
pr_info("nand: using OMAP_ECC_BCH8_CODE_HW_DETECTION_SW\n");
|
|
nand_chip->ecc.mode = NAND_ECC_HW;
|
|
nand_chip->ecc.size = 512;
|
|
nand_chip->ecc.bytes = 13;
|
|
nand_chip->ecc.strength = 8;
|
|
nand_chip->ecc.hwctl = omap_enable_hwecc_bch;
|
|
nand_chip->ecc.correct = nand_bch_correct_data;
|
|
nand_chip->ecc.calculate = omap_calculate_ecc_bch;
|
|
/* define ECC layout */
|
|
ecclayout->eccbytes = nand_chip->ecc.bytes *
|
|
(mtd->writesize /
|
|
nand_chip->ecc.size);
|
|
oob_index = BADBLOCK_MARKER_LENGTH;
|
|
for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
|
|
ecclayout->eccpos[i] = oob_index;
|
|
if (((i + 1) % nand_chip->ecc.bytes) == 0)
|
|
oob_index++;
|
|
}
|
|
/* include reserved-marker in ecclayout->oobfree calculation */
|
|
ecclayout->oobfree->offset = 1 +
|
|
ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
|
|
/* software bch library is used for locating errors */
|
|
nand_chip->ecc.priv = nand_bch_init(mtd,
|
|
nand_chip->ecc.size,
|
|
nand_chip->ecc.bytes,
|
|
&ecclayout);
|
|
if (!nand_chip->ecc.priv) {
|
|
dev_err(&info->pdev->dev, "unable to use BCH library\n");
|
|
err = -EINVAL;
|
|
goto return_error;
|
|
}
|
|
break;
|
|
|
|
case OMAP_ECC_BCH8_CODE_HW:
|
|
pr_info("nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme\n");
|
|
nand_chip->ecc.mode = NAND_ECC_HW;
|
|
nand_chip->ecc.size = 512;
|
|
/* 14th bit is kept reserved for ROM-code compatibility */
|
|
nand_chip->ecc.bytes = 13 + 1;
|
|
nand_chip->ecc.strength = 8;
|
|
nand_chip->ecc.hwctl = omap_enable_hwecc_bch;
|
|
nand_chip->ecc.correct = omap_elm_correct_data;
|
|
nand_chip->ecc.calculate = omap_calculate_ecc_bch;
|
|
nand_chip->ecc.read_page = omap_read_page_bch;
|
|
nand_chip->ecc.write_page = omap_write_page_bch;
|
|
|
|
err = elm_config(info->elm_dev, BCH8_ECC,
|
|
info->mtd.writesize / nand_chip->ecc.size,
|
|
nand_chip->ecc.size, nand_chip->ecc.bytes);
|
|
if (err < 0)
|
|
goto return_error;
|
|
|
|
/* define ECC layout */
|
|
ecclayout->eccbytes = nand_chip->ecc.bytes *
|
|
(mtd->writesize /
|
|
nand_chip->ecc.size);
|
|
oob_index = BADBLOCK_MARKER_LENGTH;
|
|
for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
|
|
ecclayout->eccpos[i] = oob_index;
|
|
/* reserved marker already included in ecclayout->eccbytes */
|
|
ecclayout->oobfree->offset =
|
|
ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
|
|
break;
|
|
|
|
case OMAP_ECC_BCH16_CODE_HW:
|
|
pr_info("using OMAP_ECC_BCH16_CODE_HW ECC scheme\n");
|
|
nand_chip->ecc.mode = NAND_ECC_HW;
|
|
nand_chip->ecc.size = 512;
|
|
nand_chip->ecc.bytes = 26;
|
|
nand_chip->ecc.strength = 16;
|
|
nand_chip->ecc.hwctl = omap_enable_hwecc_bch;
|
|
nand_chip->ecc.correct = omap_elm_correct_data;
|
|
nand_chip->ecc.calculate = omap_calculate_ecc_bch;
|
|
nand_chip->ecc.read_page = omap_read_page_bch;
|
|
nand_chip->ecc.write_page = omap_write_page_bch;
|
|
|
|
err = elm_config(info->elm_dev, BCH16_ECC,
|
|
info->mtd.writesize / nand_chip->ecc.size,
|
|
nand_chip->ecc.size, nand_chip->ecc.bytes);
|
|
if (err < 0)
|
|
goto return_error;
|
|
|
|
/* define ECC layout */
|
|
ecclayout->eccbytes = nand_chip->ecc.bytes *
|
|
(mtd->writesize /
|
|
nand_chip->ecc.size);
|
|
oob_index = BADBLOCK_MARKER_LENGTH;
|
|
for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
|
|
ecclayout->eccpos[i] = oob_index;
|
|
/* reserved marker already included in ecclayout->eccbytes */
|
|
ecclayout->oobfree->offset =
|
|
ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
|
|
break;
|
|
default:
|
|
dev_err(&info->pdev->dev, "invalid or unsupported ECC scheme\n");
|
|
err = -EINVAL;
|
|
goto return_error;
|
|
}
|
|
|
|
if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW)
|
|
goto scan_tail;
|
|
|
|
/* all OOB bytes from oobfree->offset till end off OOB are free */
|
|
ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
|
|
/* check if NAND device's OOB is enough to store ECC signatures */
|
|
if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
|
|
dev_err(&info->pdev->dev,
|
|
"not enough OOB bytes required = %d, available=%d\n",
|
|
ecclayout->eccbytes, mtd->oobsize);
|
|
err = -EINVAL;
|
|
goto return_error;
|
|
}
|
|
nand_chip->ecc.layout = ecclayout;
|
|
|
|
scan_tail:
|
|
/* second phase scan */
|
|
if (nand_scan_tail(mtd)) {
|
|
err = -ENXIO;
|
|
goto return_error;
|
|
}
|
|
|
|
ppdata.of_node = pdata->of_node;
|
|
mtd_device_parse_register(mtd, NULL, &ppdata, pdata->parts,
|
|
pdata->nr_parts);
|
|
|
|
platform_set_drvdata(pdev, mtd);
|
|
|
|
return 0;
|
|
|
|
return_error:
|
|
if (info->dma)
|
|
dma_release_channel(info->dma);
|
|
if (nand_chip->ecc.priv) {
|
|
nand_bch_free(nand_chip->ecc.priv);
|
|
nand_chip->ecc.priv = NULL;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int omap_nand_remove(struct platform_device *pdev)
|
|
{
|
|
struct mtd_info *mtd = platform_get_drvdata(pdev);
|
|
struct nand_chip *nand_chip = mtd->priv;
|
|
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
|
|
mtd);
|
|
if (nand_chip->ecc.priv) {
|
|
nand_bch_free(nand_chip->ecc.priv);
|
|
nand_chip->ecc.priv = NULL;
|
|
}
|
|
if (info->dma)
|
|
dma_release_channel(info->dma);
|
|
nand_release(mtd);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver omap_nand_driver = {
|
|
.probe = omap_nand_probe,
|
|
.remove = omap_nand_remove,
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(omap_nand_driver);
|
|
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Glue layer for NAND flash on TI OMAP boards");
|