* [PATCH 7/8] mtd: nand: stm_nand_bch: add support for ST's BCH NAND controller
2014-08-13 9:11 [PATCH 0/8] mtd: nand: Support for new DT NAND driver Lee Jones
` (5 preceding siblings ...)
2014-08-13 9:12 ` [PATCH 6/8] mtd: nand: add shared register defines for ST's NAND Controller drivers Lee Jones
@ 2014-08-13 9:12 ` Lee Jones
2014-08-13 9:12 ` [PATCH 8/8] mtd: nand: stm_nand_bch: provide ST's implementation of Back Block Table Lee Jones
` (2 subsequent siblings)
9 siblings, 0 replies; 18+ messages in thread
From: Lee Jones @ 2014-08-13 9:12 UTC (permalink / raw)
To: linux-arm-kernel
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mtd/nand/Kconfig | 7 +
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/stm_nand_bch.c | 1618 +++++++++++++++++++++++++++++++++++++++
drivers/mtd/nand/stm_nand_dt.c | 109 +++
drivers/mtd/nand/stm_nand_dt.h | 24 +
include/linux/mtd/stm_nand.h | 147 ++++
6 files changed, 1906 insertions(+)
create mode 100644 drivers/mtd/nand/stm_nand_bch.c
create mode 100644 drivers/mtd/nand/stm_nand_dt.c
create mode 100644 drivers/mtd/nand/stm_nand_dt.h
create mode 100644 include/linux/mtd/stm_nand.h
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index f1cf503..2738eec 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -513,4 +513,11 @@ config MTD_NAND_XWAY
Enables support for NAND Flash chips on Lantiq XWAY SoCs. NAND is attached
to the External Bus Unit (EBU).
+config MTD_NAND_STM_BCH
+ tristate "STMicroelectronics: NANDi BCH Controller"
+ depends on ARCH_STI
+ depends on OF
+ help
+ Adds support for the STMicroelectronics NANDi BCH Controller.
+
endif # MTD_NAND
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index a035e7c..60f374b 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_MTD_NAND_NUC900) += nuc900_nand.o
obj-$(CONFIG_MTD_NAND_MPC5121_NFC) += mpc5121_nfc.o
obj-$(CONFIG_MTD_NAND_RICOH) += r852.o
obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o
+obj-$(CONFIG_MTD_NAND_STM_BCH) += stm_nand_bch.o stm_nand_dt.o
obj-$(CONFIG_MTD_NAND_GPMI_NAND) += gpmi-nand/
obj-$(CONFIG_MTD_NAND_XWAY) += xway_nand.o
obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH) += bcm47xxnflash/
diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c
new file mode 100644
index 0000000..a104343
--- /dev/null
+++ b/drivers/mtd/nand/stm_nand_bch.c
@@ -0,0 +1,1618 @@
+/*
+ * Support for STMicroelectronics NANDi BCH Controller
+ *
+ * Copyright (c) 2014 STMicroelectronics Limited
+ *
+ * Authors: Angus Clark <Angus.Clark@st.com>
+ * Lee Jones <lee.jones@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/completion.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/stm_nand_bbt.h>
+#include <linux/mtd/stm_nand.h>
+#include <linux/mtd/partitions.h>
+
+#include "stm_nand_dt.h"
+#include "stm_nand_regs.h"
+
+/* NANDi BCH Controller properties */
+#define NANDI_BCH_SECTOR_SIZE 1024
+#define NANDI_BCH_DMA_ALIGNMENT 64
+#define NANDI_BCH_MAX_BUF_LIST 8
+#define NANDI_BCH_BUF_LIST_SIZE (4 * NANDI_BCH_MAX_BUF_LIST)
+
+/* ONFI define 6 timing modes */
+#define ST_NAND_ONFI_TIMING_MODES 6
+
+#define PICO_TO_MILI(pico) (pico / 1000)
+
+static int bch_ecc_strength[] = {
+ [BCH_18BIT_ECC] = 18,
+ [BCH_30BIT_ECC] = 30,
+ [BCH_NO_ECC] = 0,
+};
+
+/* BCH 'program' structure */
+struct bch_prog {
+ u32 multi_cs_addr[3];
+ u32 multi_cs_config;
+ u8 seq[16];
+ u32 addr;
+ u32 extra;
+ u8 cmd[4];
+ u32 reserved1;
+ u32 gen_cfg;
+ u32 delay;
+ u32 reserved2;
+ u32 seq_cfg;
+};
+
+/* BCH template programs (modified on-the-fly) */
+static struct bch_prog bch_prog_read_page = {
+ .cmd = {
+ NAND_CMD_READ0,
+ NAND_CMD_READSTART,
+ },
+ .seq = {
+ BCH_ECC_SCORE(0),
+ BCH_CMD_ADDR,
+ BCH_CL_CMD_1,
+ BCH_DATA_2_SECTOR,
+ BCH_STOP,
+ },
+ .gen_cfg = (GEN_CFG_DATA_8_NOT_16 |
+ GEN_CFG_EXTRA_ADD_CYCLE |
+ GEN_CFG_LAST_SEQ_NODE),
+ .seq_cfg = SEQ_CFG_GO_STOP,
+};
+
+static struct bch_prog bch_prog_write_page = {
+ .cmd = {
+ NAND_CMD_SEQIN,
+ NAND_CMD_PAGEPROG,
+ NAND_CMD_STATUS,
+ },
+ .seq = {
+ BCH_CMD_ADDR,
+ BCH_DATA_4_SECTOR,
+ BCH_CL_CMD_1,
+ BCH_CL_CMD_2,
+ BCH_OP_ERR,
+ BCH_STOP,
+ },
+ .gen_cfg = (GEN_CFG_DATA_8_NOT_16 |
+ GEN_CFG_EXTRA_ADD_CYCLE |
+ GEN_CFG_LAST_SEQ_NODE),
+ .seq_cfg = (SEQ_CFG_GO_STOP |
+ SEQ_CFG_DATA_WRITE),
+};
+
+static struct bch_prog bch_prog_erase_block = {
+ .seq = {
+ BCH_CL_CMD_1,
+ BCH_AL_EX_0,
+ BCH_AL_EX_1,
+ BCH_AL_EX_2,
+ BCH_CL_CMD_2,
+ BCH_CL_CMD_3,
+ BCH_OP_ERR,
+ BCH_STOP,
+ },
+ .cmd = {
+ NAND_CMD_ERASE1,
+ NAND_CMD_ERASE1,
+ NAND_CMD_ERASE2,
+ NAND_CMD_STATUS,
+ },
+ .gen_cfg = (GEN_CFG_DATA_8_NOT_16 |
+ GEN_CFG_EXTRA_ADD_CYCLE |
+ GEN_CFG_LAST_SEQ_NODE),
+ .seq_cfg = (SEQ_CFG_GO_STOP |
+ SEQ_CFG_ERASE),
+};
+
+/* Configure BCH read/write/erase programs */
+static void bch_configure_progs(struct nandi_controller *nandi)
+{
+ uint8_t data_opa = ffs(nandi->sectors_per_page) - 1;
+ uint8_t data_instr = BCH_INSTR(BCH_OPC_DATA, data_opa);
+ uint32_t gen_cfg_ecc = nandi->bch_ecc_mode << GEN_CFG_ECC_SHIFT;
+
+ /* Set 'DATA' instruction */
+ bch_prog_read_page.seq[3] = data_instr;
+ bch_prog_write_page.seq[1] = data_instr;
+
+ /* Set ECC mode */
+ bch_prog_read_page.gen_cfg |= gen_cfg_ecc;
+ bch_prog_write_page.gen_cfg |= gen_cfg_ecc;
+ bch_prog_erase_block.gen_cfg |= gen_cfg_ecc;
+
+ /*
+ * Template sequences above are defined for devices that use 5 address
+ * cycles for page Read/Write operations (and 3 for Erase operations).
+ * Update sequences for devices that use 4 address cycles.
+ */
+ if (!nandi->extra_addr) {
+ /* Clear 'GEN_CFG_EXTRA_ADD_CYCLE' flag */
+ bch_prog_read_page.gen_cfg &= ~GEN_CFG_EXTRA_ADD_CYCLE;
+ bch_prog_write_page.gen_cfg &= ~GEN_CFG_EXTRA_ADD_CYCLE;
+ bch_prog_erase_block.gen_cfg &= ~GEN_CFG_EXTRA_ADD_CYCLE;
+
+ /* Configure Erase sequence for 2 address cycles */
+ /* (page address) */
+ bch_prog_erase_block.seq[0] = BCH_CL_CMD_1;
+ bch_prog_erase_block.seq[1] = BCH_AL_EX_0;
+ bch_prog_erase_block.seq[2] = BCH_AL_EX_1;
+ bch_prog_erase_block.seq[3] = BCH_CL_CMD_2;
+ bch_prog_erase_block.seq[4] = BCH_CL_CMD_3;
+ bch_prog_erase_block.seq[5] = BCH_OP_ERR;
+ bch_prog_erase_block.seq[6] = BCH_STOP;
+ }
+}
+
+/*
+ * NANDi Interrupts (shared by Hamming and BCH controllers)
+ */
+static irqreturn_t nandi_irq_handler(int irq, void *dev)
+{
+ struct nandi_controller *nandi = dev;
+ unsigned int status;
+
+ status = readl(nandi->base + NANDBCH_INT_STA);
+
+ if (nandi->bch_ecc_mode && (status & NANDBCH_INT_SEQNODESOVER)) {
+ /* BCH */
+ writel(NANDBCH_INT_CLR_SEQNODESOVER,
+ nandi->base + NANDBCH_INT_CLR);
+ complete(&nandi->seq_completed);
+ return IRQ_HANDLED;
+ }
+ if (status & NAND_INT_RBN) {
+ /* Hamming */
+ writel(NAND_INT_CLR_RBN, nandi->base + NANDHAM_INT_CLR);
+ complete(&nandi->rbn_completed);
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static void nandi_enable_interrupts(struct nandi_controller *nandi,
+ uint32_t irqs)
+{
+ uint32_t val;
+
+ val = readl(nandi->base + NANDBCH_INT_EN);
+ val |= irqs;
+ writel(val, nandi->base + NANDBCH_INT_EN);
+}
+
+static void nandi_disable_interrupts(struct nandi_controller *nandi,
+ uint32_t irqs)
+{
+ uint32_t val;
+
+ val = readl(nandi->base + NANDBCH_INT_EN);
+ val &= ~irqs;
+ writel(val, nandi->base + NANDBCH_INT_EN);
+}
+
+/*
+ * BCH Operations
+ */
+static inline void bch_load_prog_cpu(struct nandi_controller *nandi,
+ struct bch_prog *prog)
+{
+ uint32_t *src = (uint32_t *)prog;
+ uint32_t *dst = (uint32_t *)(nandi->base + NANDBCH_ADDRESS_REG_1);
+ int i;
+
+ for (i = 0; i < 16; i++) {
+ /* Skip registers marked as "reserved" */
+ if (i != 11 && i != 14)
+ writel(*src, dst);
+ dst++;
+ src++;
+ }
+}
+
+static void bch_wait_seq(struct nandi_controller *nandi)
+{
+ int ret;
+
+ ret = wait_for_completion_timeout(&nandi->seq_completed, HZ/2);
+ if (!ret)
+ dev_err(nandi->dev, "BCH Seq timeout\n");
+}
+
+uint8_t bch_erase_block(struct nandi_controller *nandi,
+ loff_t offs)
+{
+ struct nand_chip *chip = &nandi->info.chip;
+ struct bch_prog *prog = &bch_prog_erase_block;
+ uint8_t status;
+
+ dev_dbg(nandi->dev, "%s: offs = 0x%012llx\n", __func__, offs);
+
+ prog->extra = (uint32_t)(offs >> chip->page_shift);
+
+ emiss_nandi_select(nandi, STM_NANDI_BCH);
+
+ nandi_enable_interrupts(nandi, NANDBCH_INT_SEQNODESOVER);
+ reinit_completion(&nandi->seq_completed);
+
+ bch_load_prog_cpu(nandi, prog);
+
+ bch_wait_seq(nandi);
+
+ nandi_disable_interrupts(nandi, NANDBCH_INT_SEQNODESOVER);
+
+ status = (uint8_t)(readl(nandi->base +
+ NANDBCH_CHECK_STATUS_REG_A) & 0xff);
+
+ return status;
+}
+EXPORT_SYMBOL(bch_erase_block);
+
+static int bch_erase(struct mtd_info *mtd, int page)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nandi_controller *nandi = chip->priv;
+ uint32_t page_size = mtd->writesize;
+ loff_t offs = (loff_t)page * page_size;
+
+ return bch_erase_block(nandi, offs);
+}
+
+/*
+ * Detect an erased page, tolerating and correcting up to a specified number of
+ * bits at '0'. (For many devices, it is now deemed within spec for an erased
+ * page to include a number of bits at '0', either as a result of read-disturb
+ * behaviour or 'stuck-at-zero' failures.) Returns the number of corrected
+ * bits, or a '-1' if we have exceeded the maximum number of bits at '0' (likely
+ * to be a genuine uncorrectable ECC error). In the latter case, the data must
+ * be returned unmodified, in accordance with the MTD API.
+ */
+static int check_erased_page(uint8_t *data, uint32_t page_size, int max_zeros)
+{
+ uint8_t *b = data;
+ int zeros = 0;
+ int i;
+
+ for (i = 0; i < page_size; i++) {
+ zeros += hweight8(~*b++);
+ if (zeros > max_zeros)
+ return -1;
+ }
+
+ if (zeros)
+ memset(data, 0xff, page_size);
+
+ return zeros;
+}
+
+/* Returns the number of ECC errors, or '-1' for uncorrectable error */
+int bch_read_page(struct nandi_controller *nandi,
+ loff_t offs,
+ uint8_t *buf)
+{
+ struct nand_chip *chip = &nandi->info.chip;
+ struct bch_prog *prog = &bch_prog_read_page;
+ uint32_t page_size = nandi->info.mtd.writesize;
+ unsigned long list_phys;
+ unsigned long buf_phys;
+ uint32_t ecc_err;
+ int ret = 0;
+
+ dev_dbg(nandi->dev, "%s: offs = 0x%012llx\n", __func__, offs);
+
+ BUG_ON(offs & (NANDI_BCH_DMA_ALIGNMENT - 1));
+
+ emiss_nandi_select(nandi, STM_NANDI_BCH);
+
+ nandi_enable_interrupts(nandi, NANDBCH_INT_SEQNODESOVER);
+ reinit_completion(&nandi->seq_completed);
+
+ /* Reset ECC stats */
+ writel(CFG_RESET_ECC_ALL | CFG_ENABLE_AFM,
+ nandi->base + NANDBCH_CONTROLLER_CFG);
+ writel(CFG_ENABLE_AFM, nandi->base + NANDBCH_CONTROLLER_CFG);
+
+ prog->addr = (uint32_t)((offs >> (chip->page_shift - 8)) & 0xffffff00);
+
+ buf_phys = dma_map_single(NULL, buf, page_size, DMA_FROM_DEVICE);
+
+ memset(nandi->buf_list, 0x00, NANDI_BCH_BUF_LIST_SIZE);
+ nandi->buf_list[0] = buf_phys | (nandi->sectors_per_page - 1);
+
+ list_phys = dma_map_single(NULL, nandi->buf_list,
+ NANDI_BCH_BUF_LIST_SIZE, DMA_TO_DEVICE);
+
+ writel(list_phys, nandi->base + NANDBCH_BUFFER_LIST_PTR);
+
+ bch_load_prog_cpu(nandi, prog);
+
+ bch_wait_seq(nandi);
+
+ nandi_disable_interrupts(nandi, NANDBCH_INT_SEQNODESOVER);
+
+ dma_unmap_single(NULL, list_phys, NANDI_BCH_BUF_LIST_SIZE,
+ DMA_TO_DEVICE);
+ dma_unmap_single(NULL, buf_phys, page_size, DMA_FROM_DEVICE);
+
+ /* Use the maximum per-sector ECC count! */
+ ecc_err = readl(nandi->base + NANDBCH_ECC_SCORE_REG_A) & 0xff;
+ if (ecc_err == 0xff) {
+ /*
+ * Downgrade uncorrectable ECC error for an erased page,
+ * tolerating 'bch_ecc_strength' bits at zero.
+ */
+ ret = check_erased_page(buf, page_size, chip->ecc.strength);
+ if (ret >= 0)
+ dev_dbg(nandi->dev,
+ "%s: erased page detected: \n"
+ " downgrading uncorrectable ECC error.\n",
+ __func__);
+ } else {
+ ret = (int)ecc_err;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(bch_read_page);
+
+static int bch_read(struct mtd_info *mtd, struct nand_chip *chip,
+ uint8_t *buf, int oob_required, int page)
+{
+ struct nandi_controller *nandi = chip->priv;
+ uint32_t page_size = mtd->writesize;
+ loff_t offs = (loff_t)page * page_size;
+ bool bounce = false;
+ uint8_t *p;
+ int ret;
+
+ if (((unsigned int)buf & (NANDI_BCH_DMA_ALIGNMENT - 1)) ||
+ (!virt_addr_valid(buf))) /* vmalloc'd buffer! */
+ bounce = true;
+
+ p = bounce ? nandi->page_buf : buf;
+
+ ret = bch_read_page(nandi, offs, p);
+ if (ret < 0)
+ mtd->ecc_stats.failed++;
+ else
+ mtd->ecc_stats.corrected += ret;
+
+ if (bounce)
+ memcpy(buf, p, page_size);
+
+ return ret;
+}
+
+/* Returns the status of the NAND device following the write operation */
+uint8_t bch_write_page(struct nandi_controller *nandi,
+ loff_t offs, const uint8_t *buf)
+{
+ struct nand_chip *chip = &nandi->info.chip;
+ struct bch_prog *prog = &bch_prog_write_page;
+ uint32_t page_size = nandi->info.mtd.writesize;
+ uint8_t *p = (uint8_t *)buf;
+ unsigned long list_phys;
+ unsigned long buf_phys;
+ uint8_t status;
+ bool bounce = false;
+
+ dev_dbg(nandi->dev, "%s: offs = 0x%012llx\n", __func__, offs);
+
+ BUG_ON(offs & (page_size - 1));
+
+ if (((unsigned long)buf & (NANDI_BCH_DMA_ALIGNMENT - 1)) ||
+ !virt_addr_valid(buf)) { /* vmalloc'd buffer! */
+ bounce = true;
+ }
+
+ if (bounce) {
+ memcpy(nandi->page_buf, buf, page_size);
+ p = nandi->page_buf;
+ nandi->cached_page = -1;
+ }
+
+ emiss_nandi_select(nandi, STM_NANDI_BCH);
+
+ nandi_enable_interrupts(nandi, NANDBCH_INT_SEQNODESOVER);
+ reinit_completion(&nandi->seq_completed);
+
+ prog->addr = (uint32_t)((offs >> (chip->page_shift - 8)) & 0xffffff00);
+
+ buf_phys = dma_map_single(NULL, p, page_size, DMA_TO_DEVICE);
+ memset(nandi->buf_list, 0x00, NANDI_BCH_BUF_LIST_SIZE);
+ nandi->buf_list[0] = buf_phys | (nandi->sectors_per_page - 1);
+
+ list_phys = dma_map_single(NULL, nandi->buf_list,
+ NANDI_BCH_BUF_LIST_SIZE, DMA_TO_DEVICE);
+
+ writel(list_phys, nandi->base + NANDBCH_BUFFER_LIST_PTR);
+
+ bch_load_prog_cpu(nandi, prog);
+
+ bch_wait_seq(nandi);
+
+ nandi_disable_interrupts(nandi, NANDBCH_INT_SEQNODESOVER);
+
+ dma_unmap_single(NULL, list_phys, NANDI_BCH_BUF_LIST_SIZE,
+ DMA_TO_DEVICE);
+ dma_unmap_single(NULL, buf_phys, page_size, DMA_FROM_DEVICE);
+
+ status = (uint8_t)(readl(nandi->base +
+ NANDBCH_CHECK_STATUS_REG_A) & 0xff);
+
+ return status;
+}
+EXPORT_SYMBOL(bch_write_page);
+
+static int bch_write(struct mtd_info *mtd, struct nand_chip *chip,
+ uint32_t offset, int data_len, const uint8_t *buf,
+ int oob_required, int page, int cached, int raw)
+{
+ struct nandi_controller *nandi = chip->priv;
+ uint32_t page_size = mtd->writesize;
+ loff_t offs = (loff_t)page * page_size;
+ int ret;
+
+ ret = bch_write_page(nandi, offs, buf);
+ if (ret & NAND_STATUS_FAIL)
+ return -EIO;
+
+ return 0;
+}
+
+/*
+ * Hamming-FLEX operations
+ */
+static int flex_wait_rbn(struct nandi_controller *nandi)
+{
+ int ret;
+
+ ret = wait_for_completion_timeout(&nandi->rbn_completed, HZ/2);
+ if (!ret)
+ dev_err(nandi->dev, "FLEX RBn timeout\n");
+
+ return ret;
+}
+
+static void flex_cmd(struct nandi_controller *nandi, uint8_t cmd)
+{
+ uint32_t val;
+
+ val = (FLEX_CMD_CSN | FLEX_CMD_BEATS_1 | cmd);
+ writel(val, nandi->base + NANDHAM_FLEX_CMD);
+}
+
+static void flex_addr(struct nandi_controller *nandi,
+ uint32_t addr, int cycles)
+{
+ addr &= 0x00ffffff;
+
+ BUG_ON(cycles < 1);
+ BUG_ON(cycles > 3);
+
+ addr |= (FLEX_ADDR_CSN | FLEX_ADDR_ADD8_VALID);
+ addr |= (cycles & 0x3) << 28;
+
+ writel(addr, nandi->base + NANDHAM_FLEX_ADD);
+}
+
+/*
+ * Partial implementation of MTD/NAND Interface, based on Hamming-FLEX
+ * operation.
+ *
+ * Allows us to make use of nand_base.c functions where possible
+ * (e.g. nand_scan_ident() and friends).
+ */
+static void flex_command_lp(struct mtd_info *mtd, unsigned int command,
+ int column, int page)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nandi_controller *nandi = chip->priv;
+
+ emiss_nandi_select(nandi, STM_NANDI_HAMMING);
+
+ switch (command) {
+ case NAND_CMD_READOOB:
+ /* Emulate NAND_CMD_READOOB */
+ column += mtd->writesize;
+ command = NAND_CMD_READ0;
+ break;
+ case NAND_CMD_READ0:
+ case NAND_CMD_ERASE1:
+ case NAND_CMD_SEQIN:
+ case NAND_CMD_RESET:
+ case NAND_CMD_PARAM:
+ /* Prime RBn wait */
+ nandi_enable_interrupts(nandi, NAND_INT_RBN);
+ reinit_completion(&nandi->rbn_completed);
+ break;
+ case NAND_CMD_READID:
+ case NAND_CMD_STATUS:
+ case NAND_CMD_ERASE2:
+ break;
+ default:
+ /* Catch unexpected commands */
+ BUG();
+ }
+
+ /*
+ * Command Cycle
+ */
+ flex_cmd(nandi, command);
+
+ /*
+ * Address Cycles
+ */
+ if (column != -1)
+ flex_addr(nandi, column,
+ (command == NAND_CMD_READID) ? 1 : 2);
+
+ if (page != -1)
+ flex_addr(nandi, page, nandi->extra_addr ? 3 : 2);
+
+ /* Complete 'READ0' command */
+ if (command == NAND_CMD_READ0)
+ flex_cmd(nandi, NAND_CMD_READSTART);
+
+ /* Wait for RBn, if required */
+ /* (Note, other commands may handle wait elsewhere) */
+ if (command == NAND_CMD_RESET ||
+ command == NAND_CMD_READ0 ||
+ command == NAND_CMD_PARAM) {
+ flex_wait_rbn(nandi);
+ nandi_disable_interrupts(nandi, NAND_INT_RBN);
+ }
+}
+
+static uint8_t flex_read_byte(struct mtd_info *mtd)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nandi_controller *nandi = chip->priv;
+
+ emiss_nandi_select(nandi, STM_NANDI_HAMMING);
+
+ return (uint8_t)(readl(nandi->base + NANDHAM_FLEX_DATA) & 0xff);
+}
+
+static int flex_wait_func(struct mtd_info *mtd, struct nand_chip *chip)
+{
+ struct nandi_controller *nandi = chip->priv;
+
+ emiss_nandi_select(nandi, STM_NANDI_HAMMING);
+
+ flex_wait_rbn(nandi);
+
+ flex_cmd(nandi, NAND_CMD_STATUS);
+
+ return (int)(readl(nandi->base + NANDHAM_FLEX_DATA) & 0xff);
+}
+
+/* Multi-CS devices not supported */
+static void flex_select_chip(struct mtd_info *mtd, int chipnr)
+{
+
+}
+
+static void flex_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nandi_controller *nandi = chip->priv;
+ int aligned;
+
+ emiss_nandi_select(nandi, STM_NANDI_HAMMING);
+
+ /* Read bytes until buf is 4-byte aligned */
+ while (len && ((unsigned int)buf & 0x3)) {
+ *buf++ = (uint8_t)(readl(nandi->base + NANDHAM_FLEX_DATA)
+ & 0xff);
+ len--;
+ };
+
+ /* Use 'BEATS_4'/readsl */
+ if (len > 8) {
+ aligned = len & ~0x3;
+ writel(FLEX_DATA_CFG_BEATS_4 | FLEX_DATA_CFG_CSN,
+ nandi->base + NANDHAM_FLEX_DATAREAD_CONFIG);
+
+ readsl(nandi->base + NANDHAM_FLEX_DATA, buf, aligned >> 2);
+
+ buf += aligned;
+ len -= aligned;
+
+ writel(FLEX_DATA_CFG_BEATS_1 | FLEX_DATA_CFG_CSN,
+ nandi->base + NANDHAM_FLEX_DATAREAD_CONFIG);
+ }
+
+ /* Mop up remaining bytes */
+ while (len > 0) {
+ *buf++ = (uint8_t)(readl(nandi->base + NANDHAM_FLEX_DATA)
+ & 0xff);
+ len--;
+ }
+}
+
+static void flex_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nandi_controller *nandi = chip->priv;
+ int aligned;
+
+ /* Write bytes until buf is 4-byte aligned */
+ while (len && ((unsigned int)buf & 0x3)) {
+ writel(*buf++, nandi->base + NANDHAM_FLEX_DATA);
+ len--;
+ };
+
+ /* USE 'BEATS_4/writesl */
+ if (len > 8) {
+ aligned = len & ~0x3;
+ writel(FLEX_DATA_CFG_BEATS_4 | FLEX_DATA_CFG_CSN,
+ nandi->base + NANDHAM_FLEX_DATAWRITE_CONFIG);
+ writesl(nandi->base + NANDHAM_FLEX_DATA, buf, aligned >> 2);
+ buf += aligned;
+ len -= aligned;
+ writel(FLEX_DATA_CFG_BEATS_1 | FLEX_DATA_CFG_CSN,
+ nandi->base + NANDHAM_FLEX_DATAWRITE_CONFIG);
+ }
+
+ /* Mop up remaining bytes */
+ while (len > 0) {
+ writel(*buf++, nandi->base + NANDHAM_FLEX_DATA);
+ len--;
+ }
+}
+
+int flex_read_raw(struct nandi_controller *nandi,
+ uint32_t page_addr,
+ uint32_t col_addr,
+ uint8_t *buf, uint32_t len)
+{
+ dev_dbg(nandi->dev, "%s %u bytes at [0x%06x,0x%04x]\n",
+ __func__, len, page_addr, col_addr);
+
+ BUG_ON(len & 0x3);
+ BUG_ON((unsigned long)buf & 0x3);
+
+ emiss_nandi_select(nandi, STM_NANDI_HAMMING);
+ nandi_enable_interrupts(nandi, NAND_INT_RBN);
+ reinit_completion(&nandi->rbn_completed);
+
+ writel(FLEX_DATA_CFG_BEATS_4 | FLEX_DATA_CFG_CSN,
+ nandi->base + NANDHAM_FLEX_DATAREAD_CONFIG);
+
+ flex_cmd(nandi, NAND_CMD_READ0);
+ flex_addr(nandi, col_addr, 2);
+ flex_addr(nandi, page_addr, nandi->extra_addr ? 3 : 2);
+ flex_cmd(nandi, NAND_CMD_READSTART);
+
+ flex_wait_rbn(nandi);
+
+ readsl(nandi->base + NANDHAM_FLEX_DATA, buf, len / 4);
+
+ nandi_disable_interrupts(nandi, NAND_INT_RBN);
+
+ writel(FLEX_DATA_CFG_BEATS_1 | FLEX_DATA_CFG_CSN,
+ nandi->base + NANDHAM_FLEX_DATAREAD_CONFIG);
+
+ return 0;
+}
+EXPORT_SYMBOL(flex_read_raw);
+
+static int bch_mtd_read_oob(struct mtd_info *mtd,
+ struct nand_chip *chip, int page)
+{
+ BUG();
+ return 0;
+}
+
+static int bch_mtd_write_oob(struct mtd_info *mtd,
+ struct nand_chip *chip, int page)
+{
+ BUG();
+ return 0;
+}
+
+static int bch_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+ uint8_t *buf, int oob_required, int page)
+{
+ BUG();
+ return 0;
+}
+
+static int bch_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+ const uint8_t *buf, int oob_required)
+{
+ BUG();
+ return 0;
+}
+
+static void bch_hwctl(struct mtd_info *mtd, int mode)
+{
+ BUG();
+}
+
+static int bch_calculate(struct mtd_info *mtd, const uint8_t *dat,
+ uint8_t *ecc_code)
+{
+ BUG();
+ return 0;
+}
+
+static int bch_correct(struct mtd_info *mtd, uint8_t *dat, uint8_t *read_ecc,
+ uint8_t *calc_ecc)
+{
+ BUG();
+ return 0;
+}
+
+/*
+ * Initialisation
+ */
+static int bch_check_compatibility(struct nandi_controller *nandi,
+ struct mtd_info *mtd,
+ struct nand_chip *chip)
+{
+ if (chip->bits_per_cell > 1)
+ dev_warn(nandi->dev, "MLC NAND not fully supported\n");
+
+ if (chip->options & NAND_BUSWIDTH_16) {
+ dev_err(nandi->dev, "x16 NAND not supported\n");
+ return false;
+ }
+
+ if (nandi->blocks_per_device / 4 > mtd->writesize) {
+ /* Need to implement multi-page BBT support... */
+ dev_err(nandi->dev, "BBT too big to fit in single page\n");
+ return false;
+ }
+
+ if (bch_ecc_sizes[nandi->bch_ecc_mode] * nandi->sectors_per_page >
+ mtd->oobsize) {
+ dev_err(nandi->dev, "insufficient OOB for selected ECC\n");
+ return false;
+ }
+
+ return true;
+}
+
+/* Select strongest ECC scheme compatible with OOB size */
+static int bch_set_ecc_auto(struct nandi_controller *nandi,
+ struct mtd_info *mtd)
+{
+ int oob_bytes_per_sector = mtd->oobsize / nandi->sectors_per_page;
+ int try_ecc_modes[] = { BCH_30BIT_ECC, BCH_18BIT_ECC, -1 };
+ int m, ecc_mode;
+
+ for (m = 0; try_ecc_modes[m] >= 0; m++) {
+ ecc_mode = try_ecc_modes[m];
+ if (oob_bytes_per_sector >= bch_ecc_sizes[ecc_mode]) {
+ nandi->bch_ecc_mode = ecc_mode;
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static void nandi_set_mtd_defaults(struct nandi_controller *nandi,
+ struct mtd_info *mtd, struct nand_chip *chip)
+{
+ struct nandi_info *info = &nandi->info;
+ int i;
+
+ /* ecclayout */
+ info->ecclayout.eccbytes = mtd->oobsize;
+ for (i = 0; i < 64; i++)
+ info->ecclayout.eccpos[i] = i;
+ info->ecclayout.oobfree[0].offset = 0;
+ info->ecclayout.oobfree[0].length = 0;
+ chip->ecc.mode = NAND_ECC_HW;
+
+ /* nand_chip */
+ chip->controller = &chip->hwcontrol;
+ spin_lock_init(&chip->controller->lock);
+ init_waitqueue_head(&chip->controller->wq);
+ chip->state = FL_READY;
+ chip->priv = nandi;
+ chip->ecc.layout = &info->ecclayout;
+ chip->options |= NAND_NO_SUBPAGE_WRITE;
+
+ chip->cmdfunc = flex_command_lp;
+ chip->read_byte = flex_read_byte;
+ chip->select_chip = flex_select_chip;
+ chip->waitfunc = flex_wait_func;
+ chip->read_buf = flex_read_buf;
+ chip->write_buf = flex_write_buf;
+
+ chip->bbt_options |= NAND_BBT_USE_FLASH;
+
+ /* mtd_info */
+ mtd->owner = THIS_MODULE;
+ mtd->type = MTD_NANDFLASH;
+ mtd->flags = MTD_CAP_NANDFLASH;
+ mtd->ecclayout = &info->ecclayout;
+
+ chip->ecc.hwctl = bch_hwctl;
+ chip->ecc.calculate = bch_calculate;
+ chip->ecc.correct = bch_correct;
+
+ chip->ecc.read_oob = bch_mtd_read_oob;
+ chip->ecc.write_oob = bch_mtd_write_oob;
+
+ chip->ecc.read_page = bch_read;
+ chip->ecc.read_page_raw = bch_read_page_raw;
+ chip->ecc.write_page_raw = bch_write_page_raw;
+ chip->write_page = bch_write;
+ chip->erase = bch_erase;
+
+#ifdef CONFIG_MTD_NAND_STM_BCH_BBT
+ chip->scan_bbt = bch_scan_bbt;
+ chip->block_bad = bch_block_isbad;
+ chip->block_markbad = bch_block_markbad;
+#endif
+}
+
+/*
+ * Timing and Clocks
+ */
+
+static void nandi_clk_enable(struct nandi_controller *nandi)
+{
+ clk_prepare_enable(nandi->emi_clk);
+ clk_prepare_enable(nandi->bch_clk);
+}
+
+static void nandi_clk_disable(struct nandi_controller *nandi)
+{
+ clk_disable_unprepare(nandi->emi_clk);
+ clk_disable_unprepare(nandi->bch_clk);
+}
+
+static struct clk *nandi_clk_setup(struct nandi_controller *nandi,
+ char *clkname)
+{
+ struct clk *clk;
+ int ret;
+
+ clk = devm_clk_get(nandi->dev, clkname);
+ if (IS_ERR_OR_NULL(clk)) {
+ dev_warn(nandi->dev, "Failed to get %s clock\n", clkname);
+ return NULL;
+ }
+
+ ret = clk_prepare_enable(clk);
+ if (ret) {
+ dev_warn(nandi->dev, "Failed to enable %s clock\n", clkname);
+ return NULL;
+ }
+
+ return clk;
+}
+
+/* Derive Hamming-FLEX timing register values from 'nand_sdr_timings' data */
+static void flex_calc_timing_registers(const struct nand_sdr_timings *spec,
+ int tCLK, int relax,
+ uint32_t *ctl_timing,
+ uint32_t *wen_timing,
+ uint32_t *ren_timing)
+{
+ int tMAX_HOLD;
+ int n_ctl_setup;
+ int n_ctl_hold;
+ int n_ctl_wb;
+
+ int tMAX_WEN_OFF;
+ int n_wen_on;
+ int n_wen_off;
+
+ int tMAX_REN_OFF;
+ int n_ren_on;
+ int n_ren_off;
+
+ /*
+ * CTL_TIMING
+ */
+
+ /* - SETUP */
+ n_ctl_setup = (PICO_TO_MILI(spec->tCLS_min - spec->tWP_min)
+ + tCLK - 1)/tCLK;
+ if (n_ctl_setup < 1)
+ n_ctl_setup = 1;
+ n_ctl_setup += relax;
+
+ /* - HOLD */
+ tMAX_HOLD = spec->tCLH_min;
+ if (spec->tCH_min > tMAX_HOLD)
+ tMAX_HOLD = spec->tCH_min;
+ if (spec->tALH_min > tMAX_HOLD)
+ tMAX_HOLD = spec->tALH_min;
+ if (spec->tDH_min > tMAX_HOLD)
+ tMAX_HOLD = spec->tDH_min;
+ n_ctl_hold = (PICO_TO_MILI(tMAX_HOLD) + tCLK - 1)/tCLK + relax;
+
+ /* - CE_deassert_hold = 0 */
+
+ /* - WE_high_to_RBn_low */
+ n_ctl_wb = (PICO_TO_MILI(spec->tWB_max) + tCLK - 1)/tCLK;
+
+ *ctl_timing = ((n_ctl_setup & 0xff) |
+ (n_ctl_hold & 0xff) << 8 |
+ (n_ctl_wb & 0xff) << 24);
+
+ /*
+ * WEN_TIMING
+ */
+
+ /* - ON */
+ n_wen_on = (PICO_TO_MILI(spec->tWH_min) + tCLK - 1)/tCLK + relax;
+
+ /* - OFF */
+ tMAX_WEN_OFF = spec->tWC_min - spec->tWH_min;
+ if (spec->tWP_min > tMAX_WEN_OFF)
+ tMAX_WEN_OFF = spec->tWP_min;
+ n_wen_off = (PICO_TO_MILI(tMAX_WEN_OFF) + tCLK - 1)/tCLK + relax;
+
+ *wen_timing = ((n_wen_on & 0xff) |
+ (n_wen_off & 0xff) << 8);
+
+ /*
+ * REN_TIMING
+ */
+
+ /* - ON */
+ n_ren_on = (PICO_TO_MILI(spec->tREH_min) + tCLK - 1)/tCLK + relax;
+
+ /* - OFF */
+ tMAX_REN_OFF = spec->tRC_min - spec->tREH_min;
+ if (spec->tRP_min > tMAX_REN_OFF)
+ tMAX_REN_OFF = spec->tRP_min;
+ if (spec->tREA_max > tMAX_REN_OFF)
+ tMAX_REN_OFF = spec->tREA_max;
+ n_ren_off = (PICO_TO_MILI(tMAX_REN_OFF) + tCLK - 1)/tCLK + 1 + relax;
+
+ *ren_timing = ((n_ren_on & 0xff) |
+ (n_ren_off & 0xff) << 8);
+}
+
+/* Derive BCH timing register values from 'nand_sdr_timings' data */
+static void bch_calc_timing_registers(const struct nand_sdr_timings *spec,
+ int tCLK, int relax,
+ uint32_t *ctl_timing,
+ uint32_t *wen_timing,
+ uint32_t *ren_timing)
+{
+ int tMAX_HOLD;
+ int n_ctl_setup;
+ int n_ctl_hold;
+ int n_ctl_wb;
+
+ int n_wen_on;
+ int n_wen_off;
+ int wen_half_on;
+ int wen_half_off;
+
+ int tMAX_REN_ON;
+ int tMAX_CS_DEASSERT;
+ int n_d_latch;
+ int n_telqv;
+ int n_ren_on;
+ int n_ren_off;
+ int ren_half_on;
+ int ren_half_off;
+
+ /*
+ * CTL_TIMING
+ */
+
+ /* - SETUP */
+ if (spec->tCLS_min > spec->tWP_min)
+ n_ctl_setup = (PICO_TO_MILI(spec->tCLS_min - spec->tWP_min)
+ + tCLK - 1)/tCLK;
+ else
+ n_ctl_setup = 0;
+ n_ctl_setup += relax;
+
+ /* - HOLD */
+ tMAX_HOLD = spec->tCLH_min;
+ if (spec->tCH_min > tMAX_HOLD)
+ tMAX_HOLD = spec->tCH_min;
+ if (spec->tALH_min > tMAX_HOLD)
+ tMAX_HOLD = spec->tALH_min;
+ if (spec->tDH_min > tMAX_HOLD)
+ tMAX_HOLD = spec->tDH_min;
+ n_ctl_hold = (PICO_TO_MILI(tMAX_HOLD) + tCLK - 1)/tCLK + relax;
+ /* - CE_deassert_hold = 0 */
+
+ /* - WE_high_to_RBn_low */
+ n_ctl_wb = (PICO_TO_MILI(spec->tWB_max) + tCLK - 1)/tCLK;
+
+ *ctl_timing = ((n_ctl_setup & 0xff) |
+ (n_ctl_hold & 0xff) << 8 |
+ (n_ctl_wb & 0xff) << 24);
+
+ /*
+ * WEN_TIMING
+ */
+
+ /* - ON */
+ n_wen_on = (2 * PICO_TO_MILI(spec->tWH_min) + tCLK - 1)/tCLK;
+ wen_half_on = n_wen_on % 2;
+ n_wen_on /= 2;
+ n_wen_on += relax;
+
+ /* - OFF */
+ n_wen_off = (2 * PICO_TO_MILI(spec->tWP_min) + tCLK - 1)/tCLK;
+ wen_half_off = n_wen_off % 2;
+ n_wen_off /= 2;
+ n_wen_off += relax;
+
+ *wen_timing = ((n_wen_on & 0xff) |
+ (n_wen_off & 0xff) << 8 |
+ (wen_half_on << 16) |
+ (wen_half_off << 17));
+
+ /*
+ * REN_TIMING
+ */
+
+ /* - ON */
+ tMAX_REN_ON = spec->tRC_min - spec->tRP_min;
+ if (spec->tREH_min > tMAX_REN_ON)
+ tMAX_REN_ON = spec->tREH_min;
+
+ n_ren_on = (2 * PICO_TO_MILI(tMAX_REN_ON) + tCLK - 1)/tCLK;
+ ren_half_on = n_ren_on % 2;
+ n_ren_on /= 2;
+ n_ren_on += relax;
+
+ /* - OFF */
+ n_ren_off = (2 * PICO_TO_MILI(spec->tREA_max) + tCLK - 1)/tCLK;
+ ren_half_off = n_ren_off % 2;
+ n_ren_off /= 2;
+ n_ren_off += relax;
+
+ /* - DATA_LATCH */
+ if (PICO_TO_MILI(spec->tREA_max) <=
+ (PICO_TO_MILI(spec->tRP_min) - (2 * tCLK)))
+ n_d_latch = 0;
+ else if (PICO_TO_MILI(spec->tREA_max) <=
+ (PICO_TO_MILI(spec->tRP_min) - tCLK))
+ n_d_latch = 1;
+ else if ((spec->tREA_max <= spec->tRP_min) &&
+ (PICO_TO_MILI(spec->tRHOH_min) >= 2 * tCLK))
+ n_d_latch = 2;
+ else
+ n_d_latch = 3;
+
+ /* - TELQV */
+ tMAX_CS_DEASSERT = spec->tCOH_min;
+ if (spec->tCHZ_max > tMAX_CS_DEASSERT)
+ tMAX_CS_DEASSERT = spec->tCHZ_max;
+
+ n_telqv = (PICO_TO_MILI(tMAX_CS_DEASSERT) + tCLK - 1)/tCLK;
+
+ *ren_timing = ((n_ren_on & 0xff) |
+ (n_ren_off & 0xff) << 8 |
+ (n_d_latch & 0x3) << 16 |
+ (wen_half_on << 18) |
+ (wen_half_off << 19) |
+ (n_telqv & 0xff) << 24);
+}
+
+static void flex_configure_timing_registers(struct nandi_controller *nandi,
+ const struct nand_sdr_timings *spec,
+ int relax)
+{
+ uint32_t ctl_timing;
+ uint32_t wen_timing;
+ uint32_t ren_timing;
+ int emi_t_ns;
+
+ /* Select Hamming Controller */
+ emiss_nandi_select(nandi, STM_NANDI_HAMMING);
+
+ /* Get EMI clock (default 100MHz) */
+ if (nandi->emi_clk)
+ emi_t_ns = 1000000000UL / clk_get_rate(nandi->emi_clk);
+ else {
+ dev_warn(nandi->dev,
+ "No EMI clock available; assuming default 100MHz\n");
+ emi_t_ns = 10;
+ }
+
+ /* Derive timing register values from specification */
+ flex_calc_timing_registers(spec, emi_t_ns, relax,
+ &ctl_timing, &wen_timing, &ren_timing);
+
+ dev_dbg(nandi->dev,
+ "updating FLEX timing configuration [0x%08x, 0x%08x, 0x%08x]\n",
+ ctl_timing, wen_timing, ren_timing);
+
+ /* Program timing registers */
+ writel(ctl_timing, nandi->base + NANDHAM_CTL_TIMING);
+ writel(wen_timing, nandi->base + NANDHAM_WEN_TIMING);
+ writel(ren_timing, nandi->base + NANDHAM_REN_TIMING);
+}
+
+static void bch_configure_timing_registers(struct nandi_controller *nandi,
+ const struct nand_sdr_timings *spec,
+ int relax)
+{
+ uint32_t ctl_timing;
+ uint32_t wen_timing;
+ uint32_t ren_timing;
+ int bch_t_ns;
+
+ /* Select BCH Controller */
+ emiss_nandi_select(nandi, STM_NANDI_BCH);
+
+ /* Get BCH clock (default 200MHz) */
+ if (nandi->bch_clk)
+ bch_t_ns = 1000000000UL / clk_get_rate(nandi->bch_clk);
+ else {
+ dev_warn(nandi->dev,
+ "No BCH clock available; assuming default 200MHz\n");
+ bch_t_ns = 5;
+ }
+
+ /* Derive timing register values from specification */
+ bch_calc_timing_registers(spec, bch_t_ns, relax,
+ &ctl_timing, &wen_timing, &ren_timing);
+
+ dev_dbg(nandi->dev,
+ "updating BCH timing configuration [0x%08x, 0x%08x, 0x%08x]\n",
+ ctl_timing, wen_timing, ren_timing);
+
+ /* Program timing registers */
+ writel(ctl_timing, nandi->base + NANDBCH_CTL_TIMING);
+ writel(wen_timing, nandi->base + NANDBCH_WEN_TIMING);
+ writel(ren_timing, nandi->base + NANDBCH_REN_TIMING);
+}
+
+static void nandi_configure_timing_registers(struct nandi_controller *nandi,
+ const struct nand_sdr_timings *spec,
+ int relax)
+{
+ bch_configure_timing_registers(nandi, spec, relax);
+ flex_configure_timing_registers(nandi, spec, relax);
+}
+
+static void nandi_init_hamming(struct nandi_controller *nandi, int emi_bank)
+{
+ dev_dbg(nandi->dev, "%s\n", __func__);
+
+ emiss_nandi_select(nandi, STM_NANDI_HAMMING);
+
+ /* Reset and disable boot-mode controller */
+ writel(BOOT_CFG_RESET, nandi->base + NANDHAM_BOOTBANK_CFG);
+ udelay(1);
+ writel(0x00000000, nandi->base + NANDHAM_BOOTBANK_CFG);
+
+ /* Reset controller */
+ writel(CFG_RESET, nandi->base + NANDHAM_FLEXMODE_CFG);
+ udelay(1);
+ writel(0x00000000, nandi->base + NANDHAM_FLEXMODE_CFG);
+
+ /* Set EMI Bank */
+ writel(0x1 << emi_bank, nandi->base + NANDHAM_FLEX_MUXCTRL);
+
+ /* Enable FLEX mode */
+ writel(CFG_ENABLE_FLEX, nandi->base + NANDHAM_FLEXMODE_CFG);
+
+ /* Configure FLEX_DATA_READ/WRITE for 1-byte access */
+ writel(FLEX_DATA_CFG_BEATS_1 | FLEX_DATA_CFG_CSN,
+ nandi->base + NANDHAM_FLEX_DATAREAD_CONFIG);
+ writel(FLEX_DATA_CFG_BEATS_1 | FLEX_DATA_CFG_CSN,
+ nandi->base + NANDHAM_FLEX_DATAREAD_CONFIG);
+
+ /* RBn interrupt on rising edge */
+ writel(NAND_EDGE_CFG_RBN_RISING, nandi->base + NANDHAM_INT_EDGE_CFG);
+
+ /* Enable interrupts */
+ nandi_enable_interrupts(nandi, NAND_INT_ENABLE);
+}
+
+static void nandi_init_bch(struct nandi_controller *nandi, int emi_bank)
+{
+ dev_dbg(nandi->dev, "%s\n", __func__);
+
+ /* Initialise BCH Controller */
+ emiss_nandi_select(nandi, STM_NANDI_BCH);
+
+ /* Reset and disable boot-mode controller */
+ writel(BOOT_CFG_RESET, nandi->base + NANDBCH_BOOTBANK_CFG);
+ udelay(1);
+ writel(0x00000000, nandi->base + NANDBCH_BOOTBANK_CFG);
+
+ /* Reset AFM controller */
+ writel(CFG_RESET, nandi->base + NANDBCH_CONTROLLER_CFG);
+ udelay(1);
+ writel(0x00000000, nandi->base + NANDBCH_CONTROLLER_CFG);
+
+ /* Set EMI Bank */
+ writel(0x1 << emi_bank, nandi->base + NANDBCH_FLEX_MUXCTRL);
+
+ /* Reset ECC stats */
+ writel(CFG_RESET_ECC_ALL, nandi->base + NANDBCH_CONTROLLER_CFG);
+ udelay(1);
+
+ /* Enable AFM */
+ writel(CFG_ENABLE_AFM, nandi->base + NANDBCH_CONTROLLER_CFG);
+
+ /* Configure Read DMA Plugs (values supplied by Validation) */
+ writel(0x00000005, nandi->dma + EMISS_NAND_RD_DMA_PAGE_SIZE);
+ writel(0x00000005, nandi->dma + EMISS_NAND_RD_DMA_MAX_OPCODE_SIZE);
+ writel(0x00000002, nandi->dma + EMISS_NAND_RD_DMA_MIN_OPCODE_SIZE);
+ writel(0x00000001, nandi->dma + EMISS_NAND_RD_DMA_MAX_CHUNK_SIZE);
+ writel(0x00000000, nandi->dma + EMISS_NAND_RD_DMA_MAX_MESSAGE_SIZE);
+
+ /* Configure Write DMA Plugs (values supplied by Validation) */
+ writel(0x00000005, nandi->dma + EMISS_NAND_WR_DMA_PAGE_SIZE);
+ writel(0x00000005, nandi->dma + EMISS_NAND_WR_DMA_MAX_OPCODE_SIZE);
+ writel(0x00000002, nandi->dma + EMISS_NAND_WR_DMA_MIN_OPCODE_SIZE);
+ writel(0x00000001, nandi->dma + EMISS_NAND_WR_DMA_MAX_CHUNK_SIZE);
+ writel(0x00000000, nandi->dma + EMISS_NAND_WR_DMA_MAX_MESSAGE_SIZE);
+
+ nandi_enable_interrupts(nandi, NAND_INT_ENABLE);
+}
+
+static void nandi_init_controller(struct nandi_controller *nandi,
+ int emi_bank)
+{
+ nandi_init_bch(nandi, emi_bank);
+ nandi_init_hamming(nandi, emi_bank);
+}
+
+/* Initialise working buffers, accomodating DMA alignment constraints */
+static int nandi_init_working_buffers(struct nandi_controller *nandi,
+ struct nandi_bbt_info *bbt_info,
+ struct mtd_info *mtd)
+{
+ uint32_t bbt_buf_size;
+ uint32_t buf_size;
+
+ /* - Page and OOB */
+ buf_size = mtd->writesize + mtd->oobsize + NANDI_BCH_DMA_ALIGNMENT;
+
+ /* - BBT data (page-size aligned) */
+ bbt_info->bbt_size = nandi->blocks_per_device >> 2; /* 2 bits/block */
+ bbt_buf_size = ALIGN(bbt_info->bbt_size, mtd->writesize);
+ buf_size += bbt_buf_size + NANDI_BCH_DMA_ALIGNMENT;
+
+ /* - BCH BUF list */
+ buf_size += NANDI_BCH_BUF_LIST_SIZE + NANDI_BCH_DMA_ALIGNMENT;
+
+ /* Allocate bufffer */
+ nandi->buf = devm_kzalloc(nandi->dev, buf_size, GFP_KERNEL);
+ if (!nandi->buf) {
+ dev_err(nandi->dev, "failed to allocate working buffers\n");
+ return -ENOMEM;
+ }
+
+ /* Set/Align buffer pointers */
+ nandi->page_buf = PTR_ALIGN(nandi->buf, NANDI_BCH_DMA_ALIGNMENT);
+ nandi->oob_buf = nandi->page_buf + mtd->writesize;
+ bbt_info->bbt = PTR_ALIGN(nandi->oob_buf + mtd->oobsize,
+ NANDI_BCH_DMA_ALIGNMENT);
+ nandi->buf_list = (uint32_t *)PTR_ALIGN(bbt_info->bbt + bbt_buf_size,
+ NANDI_BCH_DMA_ALIGNMENT);
+ nandi->cached_page = -1;
+
+ return 0;
+}
+
+static int remap_named_resource(struct platform_device *pdev,
+ char *name,
+ void __iomem **io_ptr)
+{
+ struct resource *res, *mem;
+ resource_size_t size;
+ void __iomem *p;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
+ if (!res)
+ return -ENXIO;
+
+ size = resource_size(res);
+
+ mem = devm_request_mem_region(&pdev->dev, res->start, size, name);
+ if (!mem)
+ return -EBUSY;
+
+ p = devm_ioremap_nocache(&pdev->dev, res->start, size);
+ if (!p)
+ return -ENOMEM;
+
+ *io_ptr = p;
+
+ return 0;
+}
+
+static struct nandi_controller *
+nandi_init_resources(struct platform_device *pdev)
+{
+ struct stm_nand_bch_ddata *ddata = platform_get_drvdata(pdev);
+ struct nandi_controller *nandi;
+ int irq;
+ int err;
+
+ nandi = devm_kzalloc(&pdev->dev, sizeof(*nandi), GFP_KERNEL);
+ if (!nandi) {
+ dev_err(&pdev->dev,
+ "failed to allocate NANDi controller data\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ nandi->dev = &pdev->dev;
+
+ err = remap_named_resource(pdev, "emi_nand", &nandi->base);
+ if (err)
+ return ERR_PTR(err);
+
+ err = remap_named_resource(pdev, "emiss", &nandi->emiss);
+ if (err)
+ return ERR_PTR(err);
+
+ nandi->dma = nandi->emiss + EMISS_NAND_DMA;
+ nandi->emisscfg = nandi->emiss + EMISS_CFG;
+
+ irq = platform_get_irq_byname(pdev, "nand_irq");
+ if (irq < 0) {
+ dev_err(&pdev->dev, "failed to find IRQ resource\n");
+ return ERR_PTR(irq);
+ }
+
+ err = devm_request_irq(&pdev->dev, irq, nandi_irq_handler,
+ IRQF_DISABLED, dev_name(&pdev->dev), nandi);
+ if (err) {
+ dev_err(&pdev->dev, "irq request failed\n");
+ return ERR_PTR(err);
+ }
+
+ nandi->emi_clk = nandi_clk_setup(nandi, "emi");
+ nandi->bch_clk = nandi_clk_setup(nandi, "bch");
+
+ ddata->nandi = nandi;
+
+ return nandi;
+}
+
+static void *stm_bch_dt_get_ddata(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct stm_nand_bch_ddata *ddata;
+ int ecc_strength;
+ int ret;
+
+ ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
+ if (!ddata)
+ return ERR_PTR(-ENOMEM);
+
+ of_property_read_u32(np, "nand-ecc-strength", &ecc_strength);
+ if (ecc_strength == 0)
+ ddata->bch_ecc_cfg = BCH_NO_ECC;
+ else if (ecc_strength == 18)
+ ddata->bch_ecc_cfg = BCH_18BIT_ECC;
+ else if (ecc_strength == 30)
+ ddata->bch_ecc_cfg = BCH_30BIT_ECC;
+ else
+ ddata->bch_ecc_cfg = BCH_ECC_AUTO;
+
+ ret = stm_of_get_nand_banks(&pdev->dev, np, &ddata->bank);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ return ddata;
+}
+
+static int stm_nand_bch_probe(struct platform_device *pdev)
+{
+ const char *part_probes[] = { "cmdlinepart", "ofpart", NULL, };
+ struct device_node *np = pdev->dev.of_node;
+ struct mtd_part_parser_data ppdata;
+ struct stm_nand_bch_ddata *ddata;
+ struct stm_nand_bank_data *bank;
+ struct nandi_bbt_info *bbt_info;
+ struct nandi_controller *nandi;
+ struct nandi_info *info;
+ struct nand_chip *chip;
+ struct mtd_info *mtd;
+ int compatible, err;
+
+ if (!np) {
+ dev_err(&pdev->dev, "DT node found\n");
+ return -EINVAL;
+ }
+
+ ddata = stm_bch_dt_get_ddata(pdev);
+ if (IS_ERR(ddata))
+ return PTR_ERR(ddata);
+
+ ppdata.of_node = stm_of_get_partitions_node(np, 0);
+
+ platform_set_drvdata(pdev, ddata);
+
+ nandi = nandi_init_resources(pdev);
+ if (IS_ERR(nandi)) {
+ dev_err(&pdev->dev, "failed to initialise NANDi resources\n");
+ return PTR_ERR(nandi);
+ }
+
+ init_completion(&nandi->seq_completed);
+ init_completion(&nandi->rbn_completed);
+
+ bank = ddata->bank;
+ if (bank)
+ nandi_init_controller(nandi, bank->csn);
+
+ info = &nandi->info;
+ chip = &info->chip;
+ bbt_info = &info->bbt_info;
+ mtd = &info->mtd;
+ mtd->priv = chip;
+ mtd->name = dev_name(&pdev->dev);
+ mtd->dev.parent = &pdev->dev;
+
+ nandi_set_mtd_defaults(nandi, mtd, chip);
+
+ err = nand_scan_ident(mtd, 1, NULL);
+ if (err)
+ return err;
+
+ /*
+ * Configure timing registers
+ */
+ if (bank && bank->timing_spec) {
+ dev_info(&pdev->dev, "Using platform timing data\n");
+ nandi_configure_timing_registers(nandi, bank->timing_spec,
+ bank->timing_relax);
+ } else if (chip->onfi_version) {
+ int mode = fls(onfi_get_async_timing_mode(chip) - 1);
+ const struct nand_sdr_timings *spec =
+ onfi_async_timing_mode_to_sdr_timings(mode);
+
+ /* Modes 4 and 5 (EDO) are not supported on our H/W */
+ if (mode > 3)
+ mode = 3;
+
+ dev_info(&pdev->dev, "Using ONFI Timing Mode %d\n", mode);
+ nandi_configure_timing_registers(nandi, spec,
+ bank ? bank->timing_relax : 0);
+ } else {
+ dev_warn(&pdev->dev, "No timing data available\n");
+ }
+
+ if (mtd->writesize < NANDI_BCH_SECTOR_SIZE) {
+ dev_err(nandi->dev,
+ "page size incompatible with BCH ECC sector\n");
+ return -EINVAL;
+ }
+
+ /* Derive some working variables */
+ nandi->sectors_per_page = mtd->writesize / NANDI_BCH_SECTOR_SIZE;
+ nandi->blocks_per_device = mtd->size >> chip->phys_erase_shift;
+ nandi->extra_addr = ((chip->chipsize >> chip->page_shift) >
+ 0x10000) ? true : false;
+ mtd->writebufsize = mtd->writesize;
+
+ /* Set ECC mode */
+ if (ddata->bch_ecc_cfg == BCH_ECC_AUTO) {
+ err = bch_set_ecc_auto(nandi, mtd);
+ if (err) {
+ dev_err(nandi->dev, "insufficient OOB for BCH ECC\n");
+ return err;
+ }
+ } else {
+ nandi->bch_ecc_mode = ddata->bch_ecc_cfg;
+ }
+
+ chip->ecc.size = NANDI_BCH_SECTOR_SIZE;
+ chip->ecc.bytes = mtd->oobsize;
+ chip->ecc.strength = bch_ecc_strength[nandi->bch_ecc_mode];
+
+ info->ecclayout.eccbytes =
+ nandi->sectors_per_page * bch_ecc_sizes[nandi->bch_ecc_mode];
+
+ compatible = bch_check_compatibility(nandi, mtd, chip);
+ if (!compatible) {
+ dev_err(nandi->dev,
+ "NAND device incompatible with NANDi/BCH Controller\n");
+ return -EINVAL;
+ }
+
+ /* Tune BCH programs according to device found and ECC mode */
+ bch_configure_progs(nandi);
+
+ err = nandi_init_working_buffers(nandi, bbt_info, mtd);
+ if (err)
+ return err;
+
+ err = nand_scan_tail(mtd);
+ if (err)
+ return err;
+
+#ifdef CONFIG_MTD_NAND_STM_BCH_BBT
+ nandi_dump_bad_blocks(nandi);
+#endif
+ /* Add partitions */
+ return mtd_device_parse_register(mtd, part_probes, &ppdata,
+ bank->partitions, bank->nr_partitions);
+}
+
+static int stm_nand_bch_remove(struct platform_device *pdev)
+{
+ struct stm_nand_bch_ddata *ddata = platform_get_drvdata(pdev);
+ struct nandi_controller *nandi = ddata->nandi;
+
+ nand_release(&nandi->info.mtd);
+
+ nandi_clk_disable(nandi);
+
+ return 0;
+}
+
+static int stm_nand_bch_suspend(struct device *dev)
+{
+ struct stm_nand_bch_ddata *ddata = dev_get_drvdata(dev);
+ struct nandi_controller *nandi = ddata->nandi;
+
+ nandi_clk_disable(nandi);
+
+ return 0;
+}
+static int stm_nand_bch_resume(struct device *dev)
+{
+ struct stm_nand_bch_ddata *ddata = dev_get_drvdata(dev);
+ struct nandi_controller *nandi = ddata->nandi;
+
+ nandi_clk_enable(nandi);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(stm_nand_bch_pm_ops,
+ stm_nand_bch_suspend,
+ stm_nand_bch_resume);
+
+static struct of_device_id nand_bch_match[] = {
+ { .compatible = "st,nand-bch", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, nand_bch_match);
+
+static struct platform_driver stm_nand_bch_driver = {
+ .probe = stm_nand_bch_probe ,
+ .remove = stm_nand_bch_remove,
+ .driver = {
+ .name = "stm-nand-bch",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(nand_bch_match),
+ .pm = &stm_nand_bch_pm_ops,
+ },
+};
+module_platform_driver(stm_nand_bch_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Angus Clark");
+MODULE_DESCRIPTION("STM NAND BCH driver");
diff --git a/drivers/mtd/nand/stm_nand_dt.c b/drivers/mtd/nand/stm_nand_dt.c
new file mode 100644
index 0000000..4f59873
--- /dev/null
+++ b/drivers/mtd/nand/stm_nand_dt.c
@@ -0,0 +1,109 @@
+/*
+ * drivers/mtd/nand/stm_nand_dt.c
+ *
+ * Support for NANDi BCH Controller Device Tree component
+ *
+ * Copyright (c) 2014 STMicroelectronics Limited
+ * Author: Author: Srinivas Kandagatla <srinivas.kandagatla@st.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/byteorder/generic.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/stm_nand.h>
+
+#include "stm_nand_regs.h"
+
+/**
+* stm_of_get_partitions_node - get partitions node from stm-nand type devices.
+*
+* @dev device pointer to use for devm allocations.
+* @np device node of the driver.
+* @bank_nr which bank number to use to get partitions.
+*
+* Returns a node pointer if found, with refcount incremented, use
+* of_node_put() on it when done.
+*
+*/
+struct device_node *stm_of_get_partitions_node(struct device_node *np,
+ int bank_nr)
+{
+ struct device_node *banknp, *partsnp = NULL;
+ char name[10];
+
+ sprintf(name, "bank%d", bank_nr);
+ banknp = of_get_child_by_name(np, name);
+ if (banknp)
+ return NULL;
+
+ partsnp = of_get_child_by_name(banknp, "partitions");
+ of_node_put(banknp);
+
+ return partsnp;
+}
+EXPORT_SYMBOL(stm_of_get_partitions_node);
+
+/**
+ * stm_of_get_nand_banks - Get nand banks info from a given device node.
+ *
+ * @dev device pointer to use for devm allocations.
+ * @np device node of the driver.
+ * @banksptr double pointer to banks which is allocated
+ * and filled with bank data.
+ *
+ * Returns a count of banks found in the given device node.
+ *
+ */
+int stm_of_get_nand_banks(struct device *dev, struct device_node *np,
+ struct stm_nand_bank_data **banksptr)
+{
+ struct stm_nand_bank_data *banks;
+ struct device_node *banknp;
+ int nr_banks = 0;
+
+ if (!np)
+ return -ENODEV;
+
+ nr_banks = of_get_child_count(np);
+ if (!nr_banks) {
+ dev_err(dev, "No NAND banks specified in DT: %s\n",
+ np->full_name);
+ return -EINVAL;
+ }
+
+ *banksptr = devm_kzalloc(dev, sizeof(*banks) * nr_banks, GFP_KERNEL);
+ banks = *banksptr;
+ banknp = NULL;
+
+ for_each_child_of_node(np, banknp) {
+ int bank = 0;
+
+ of_property_read_u32(banknp, "st,nand-csn", &banks[bank].csn);
+
+ if (of_get_nand_bus_width(banknp) == 16)
+ banks[bank].options |= NAND_BUSWIDTH_16;
+ if (of_get_nand_on_flash_bbt(banknp))
+ banks[bank].bbt_options |= NAND_BBT_USE_FLASH;
+
+ banks[bank].nr_partitions = 0;
+ banks[bank].partitions = NULL;
+
+ of_property_read_u32(banknp, "st,nand-timing-relax",
+ &banks[bank].timing_relax);
+ bank++;
+ }
+
+ return nr_banks;
+}
+EXPORT_SYMBOL(stm_of_get_nand_banks);
diff --git a/drivers/mtd/nand/stm_nand_dt.h b/drivers/mtd/nand/stm_nand_dt.h
new file mode 100644
index 0000000..53e1321
--- /dev/null
+++ b/drivers/mtd/nand/stm_nand_dt.h
@@ -0,0 +1,24 @@
+/*
+ * drivers/mtd/nand/stm_nand_dt.h
+ *
+ * Support for NANDi BCH Controller Device Tree component
+ *
+ * Copyright (c) 2014 STMicroelectronics Limited
+ * Author: Author: Srinivas Kandagatla <srinivas.kandagatla@st.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef STM_NAND_DT_H
+#define STM_NAND_DT_H
+
+struct device_node *stm_of_get_partitions_node(struct device_node *np,
+ int bank_nr);
+
+int stm_of_get_nand_banks(struct device *dev, struct device_node *np,
+ struct stm_nand_bank_data **banksp);
+
+#endif /* STM_NAND_DT_H */
diff --git a/include/linux/mtd/stm_nand.h b/include/linux/mtd/stm_nand.h
new file mode 100644
index 0000000..c3c805f
--- /dev/null
+++ b/include/linux/mtd/stm_nand.h
@@ -0,0 +1,147 @@
+/*
+ * include/linux/mtd/stm_mtd.h
+ *
+ * Support for STMicroelectronics NAND Controllers
+ *
+ * Copyright (c) 2014 STMicroelectronics Limited
+ * Author: Angus Clark <Angus.Clark@st.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef __LINUX_STM_NAND_H
+#define __LINUX_STM_NAND_H
+
+#include <linux/io.h>
+#include <linux/mtd/nand.h>
+
+/* ECC Modes */
+enum stm_nand_bch_ecc_config {
+ BCH_18BIT_ECC = 0,
+ BCH_30BIT_ECC,
+ BCH_NO_ECC,
+ BCH_ECC_RSRV,
+ BCH_ECC_AUTO,
+};
+
+/* Bad Block Table (BBT) */
+struct nandi_bbt_info {
+ uint32_t bbt_size; /* Size of bad-block table */
+ uint32_t bbt_vers[2]; /* Version (Primary/Mirror) */
+ uint32_t bbt_block[2]; /* Block No. (Primary/Mirror) */
+ uint8_t *bbt; /* Table data */
+};
+
+/* Collection of MTD/NAND device information */
+struct nandi_info {
+ struct mtd_info mtd; /* MTD info */
+ struct nand_chip chip; /* NAND chip info */
+
+ struct nand_ecclayout ecclayout; /* MTD ECC layout */
+ struct nandi_bbt_info bbt_info; /* Bad Block Table */
+ int nr_parts; /* Number of MTD partitions */
+ struct mtd_partition *parts; /* MTD partitions */
+};
+
+/* NANDi Controller (Hamming/BCH) */
+struct nandi_controller {
+ void __iomem *base; /* Controller base*/
+ void __iomem *emiss; /* EMISS control base */
+ void __iomem *emisscfg; /* EMISS config base */
+ void __iomem *dma; /* DMA control base */
+
+ struct clk *bch_clk;
+ struct clk *emi_clk;
+ /* IRQ-triggered Completions: */
+ struct completion seq_completed; /* SEQ Over */
+ struct completion rbn_completed; /* RBn */
+
+ struct device *dev;
+
+ int bch_ecc_mode; /* ECC mode */
+ bool extra_addr; /* Extra address cycle */
+
+ uint32_t blocks_per_device;
+ uint32_t sectors_per_page;
+
+ uint8_t *buf; /* Some buffers to use */
+ uint8_t *page_buf;
+ uint8_t *oob_buf;
+ uint32_t *buf_list;
+
+ int cached_page; /* page number of page in */
+ /* 'page_buf' */
+
+ struct nandi_info info; /* NAND device info */
+};
+
+/*
+ * Board-level specification relating to a 'bank' of NAND Flash
+ */
+struct stm_nand_bank_data {
+ int csn;
+ int nr_partitions;
+ struct mtd_partition *partitions;
+ unsigned int options;
+ unsigned int bbt_options;
+
+ struct nand_sdr_timings *timing_spec;
+
+ /*
+ * No. of IP clk cycles by which to 'relax' the timing configuration.
+ * Required on some boards to to accommodate board-level limitations.
+ * Used in conjunction with 'nand_sdr_timings' and ONFI configuration.
+ */
+ int timing_relax;
+};
+
+struct stm_nand_bch_ddata {
+ struct nandi_controller *nandi;
+ struct stm_nand_bank_data *bank;
+ enum stm_nand_bch_ecc_config bch_ecc_cfg;
+};
+
+enum nandi_controllers {
+ STM_NANDI_UNCONFIGURED,
+ STM_NANDI_HAMMING,
+ STM_NANDI_BCH
+};
+
+extern int flex_read_raw(struct nandi_controller *nandi,
+ uint32_t page_addr,
+ uint32_t col_addr,
+ uint8_t *buf, uint32_t len);
+extern uint8_t bch_write_page(struct nandi_controller *nandi,
+ loff_t offs, const uint8_t *buf);
+extern uint8_t bch_erase_block(struct nandi_controller *nandi,
+ loff_t offs);
+extern int bch_read_page(struct nandi_controller *nandi,
+ loff_t offs, uint8_t *buf);
+
+#define EMISS_NAND_CONFIG_HAMMING_NOT_BCH (0x1 << 6)
+
+static inline void emiss_nandi_select(struct nandi_controller *nandi,
+ enum nandi_controllers controller)
+{
+ unsigned v;
+
+ v = readl(nandi->emisscfg);
+
+ if (controller == STM_NANDI_HAMMING) {
+ if (v & EMISS_NAND_CONFIG_HAMMING_NOT_BCH)
+ return;
+ v |= EMISS_NAND_CONFIG_HAMMING_NOT_BCH;
+ } else {
+ if (!(v & EMISS_NAND_CONFIG_HAMMING_NOT_BCH))
+ return;
+ v &= ~EMISS_NAND_CONFIG_HAMMING_NOT_BCH;
+ }
+
+ writel(v, nandi->emisscfg);
+ readl(nandi->emisscfg);
+}
+
+#endif /* __LINUX_STM_NAND_H */
--
1.9.1
^ permalink raw reply related [flat|nested] 18+ messages in thread* [PATCH 8/8] mtd: nand: stm_nand_bch: provide ST's implementation of Back Block Table
2014-08-13 9:11 [PATCH 0/8] mtd: nand: Support for new DT NAND driver Lee Jones
` (6 preceding siblings ...)
2014-08-13 9:12 ` [PATCH 7/8] mtd: nand: stm_nand_bch: add support for ST's BCH NAND controller Lee Jones
@ 2014-08-13 9:12 ` Lee Jones
2014-08-13 15:44 ` [PATCH 0/8] mtd: nand: Support for new DT NAND driver pekon at pek-sem.com
2014-08-14 22:40 ` Brian Norris
9 siblings, 0 replies; 18+ messages in thread
From: Lee Jones @ 2014-08-13 9:12 UTC (permalink / raw)
To: linux-arm-kernel
This is the BBT format ST use internally. It has to be used on boards
which were flashed with or actively use ST's tooling and boards which
are booted using ST's bootloaders.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mtd/nand/Kconfig | 8 +
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/stm_nand_bbt.c | 601 +++++++++++++++++++++++++++++++++++++++
include/linux/mtd/stm_nand_bbt.h | 17 ++
4 files changed, 627 insertions(+)
create mode 100644 drivers/mtd/nand/stm_nand_bbt.c
create mode 100644 include/linux/mtd/stm_nand_bbt.h
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 2738eec..5c04ec1 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -520,4 +520,12 @@ config MTD_NAND_STM_BCH
help
Adds support for the STMicroelectronics NANDi BCH Controller.
+config MTD_NAND_STM_BCH_BBT
+ tristate "STMicroelectronics: NANDi BCH Controller Bad Block Table support"
+ default MTD_NAND_STM_BCH
+ help
+ Adds support for the STMicroelectronics Bad Block Table support.
+ If you are using a device which has has already been initialised
+ by ST or using their tooling/bootloaders, leave this enabled.
+
endif # MTD_NAND
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 60f374b..5ef0462 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_MTD_NAND_MPC5121_NFC) += mpc5121_nfc.o
obj-$(CONFIG_MTD_NAND_RICOH) += r852.o
obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o
obj-$(CONFIG_MTD_NAND_STM_BCH) += stm_nand_bch.o stm_nand_dt.o
+obj-$(CONFIG_MTD_NAND_STM_BCH_BBT) += stm_nand_bbt.o
obj-$(CONFIG_MTD_NAND_GPMI_NAND) += gpmi-nand/
obj-$(CONFIG_MTD_NAND_XWAY) += xway_nand.o
obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH) += bcm47xxnflash/
diff --git a/drivers/mtd/nand/stm_nand_bbt.c b/drivers/mtd/nand/stm_nand_bbt.c
new file mode 100644
index 0000000..242bffd
--- /dev/null
+++ b/drivers/mtd/nand/stm_nand_bbt.c
@@ -0,0 +1,601 @@
+/*
+ * Support for STMicroelectronics Bad Block Table (BBT)
+ *
+ * Copyright (c) 2014 STMicroelectronics Limited
+ *
+ * Authors: Angus Clark <Angus.Clark@st.com>
+ * Lee Jones <lee.jones@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/mtd/stm_nand.h>
+#include <linux/mtd/stm_nand_bbt.h>
+#include <generated/utsrelease.h>
+
+/*
+ * Inband Bad Block Table (IBBT)
+ */
+#define NAND_IBBT_NBLOCKS 4
+#define NAND_IBBT_SIGLEN 4
+#define NAND_IBBT_PRIMARY 0
+#define NAND_IBBT_MIRROR 1
+#define NAND_IBBT_SCHEMA 0x10
+#define NAND_IBBT_BCH_SCHEMA 0x10
+
+static uint8_t ibbt_sigs[2][NAND_IBBT_SIGLEN] = {
+ {'B', 'b', 't', '0'},
+ {'1', 't', 'b', 'B'},
+};
+
+static char *bbt_strs[] = {
+ "primary",
+ "mirror",
+};
+
+/* IBBT header */
+struct nand_ibbt_header {
+ uint8_t signature[4]; /* "Bbt0" or "1tbB" signature */
+ uint8_t version; /* BBT version ("age") */
+ uint8_t reserved[3]; /* padding */
+ uint8_t schema[4]; /* "base" schema (x4) */
+} __packed;
+
+/* Extend IBBT header with some stm-nand-bch niceties */
+struct nand_ibbt_bch_header {
+ struct nand_ibbt_header base;
+ uint8_t schema[4]; /* "private" schema (x4) */
+ uint8_t ecc_size[4]; /* ECC bytes (0, 32, 54) (x4) */
+ char author[64]; /* Arbitrary string for S/W to use */
+} __packed;
+
+/*
+ * Bad Block Tables/Bad Block Markers
+ */
+#define BBT_MARK_BAD_FACTORY 0x0
+#define BBT_MARK_BAD_WEAR 0x1
+#define BBT_MARK_GOOD 0x3
+
+static void bbt_set_block_mark(uint8_t *bbt, uint32_t block, uint8_t mark)
+{
+ unsigned int byte = block >> 2;
+ unsigned int shift = (block & 0x3) << 1;
+
+ bbt[byte] &= ~(0x3 << shift);
+ bbt[byte] |= ((mark & 0x3) << shift);
+}
+
+static uint8_t bbt_get_block_mark(uint8_t *bbt, uint32_t block)
+{
+ unsigned int byte = block >> 2;
+ unsigned int shift = (block & 0x3) << 1;
+
+ return (bbt[byte] >> shift) & 0x3;
+}
+
+static int bbt_is_block_bad(uint8_t *bbt, uint32_t block)
+{
+ return bbt_get_block_mark(bbt, block) == BBT_MARK_GOOD ? 0 : 1;
+}
+
+/* Scan page for BBM(s), according to specified BBT options */
+static int nandi_scan_bad_block_markers_page(struct nandi_controller *nandi,
+ uint32_t page)
+{
+ struct mtd_info *mtd = &nandi->info.mtd;
+ struct nand_chip *chip = mtd->priv;
+ uint8_t *oob_buf = nandi->oob_buf;
+ int i, e;
+
+ /* Read the OOB area */
+ flex_read_raw(nandi, page, mtd->writesize, oob_buf, mtd->oobsize);
+
+ if (oob_buf[chip->badblockpos] == 0xff)
+ return 0;
+
+ /* Tolerate 'alien' Hamming Boot Mode ECC */
+ e = 0;
+ for (i = 0; i < mtd->oobsize; i += 16)
+ e += hweight8(oob_buf[i + 3] ^ 'B');
+ if (e <= 1)
+ return 0;
+
+ /* Tolerate 'alien' Hamming AFM ECC */
+ e = 0;
+ for (i = 0; i < mtd->oobsize; i += 16) {
+ e += hweight8(oob_buf[i + 3] ^ 'A');
+ e += hweight8(oob_buf[i + 4] ^ 'F');
+ e += hweight8(oob_buf[i + 5] ^ 'M');
+ if (e <= 1)
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Scan block for BBM(s), according to specified BBT options */
+static int nandi_scan_bad_block_markers_block(struct nandi_controller *nandi,
+ uint32_t block)
+
+{
+ struct mtd_info *mtd = &nandi->info.mtd;
+ struct nand_chip *chip = mtd->priv;
+ uint32_t pages_per_block = mtd->erasesize >> chip->page_shift;
+ uint32_t page = block << (chip->phys_erase_shift - chip->page_shift);
+
+ if (nandi_scan_bad_block_markers_page(nandi, page))
+ return 1;
+
+ if ((chip->bbt_options & NAND_BBT_SCAN2NDPAGE) &&
+ nandi_scan_bad_block_markers_page(nandi, page + 1))
+ return 1;
+
+ if ((chip->bbt_options & NAND_BBT_SCANLASTPAGE) &&
+ nandi_scan_bad_block_markers_page(nandi,
+ page + pages_per_block - 1))
+ return 1;
+
+ return 0;
+}
+
+/* Scan for BBMs and build memory-resident BBT */
+static int nandi_scan_build_bbt(struct nandi_controller *nandi,
+ struct nandi_bbt_info *bbt_info)
+{
+ struct mtd_info *mtd = &nandi->info.mtd;
+ struct nand_chip *chip = mtd->priv;
+ uint32_t page_size = mtd->writesize;
+ uint8_t *bbt = bbt_info->bbt;
+ uint32_t block;
+
+ dev_dbg(nandi->dev,
+ "scan device for bad-block markers [bbt options = 0x%02x]\n",
+ chip->bbt_options);
+
+ memset(bbt, 0xff, page_size);
+ bbt_info->bbt_vers[0] = 0;
+ bbt_info->bbt_vers[1] = 0;
+ bbt_info->bbt_block[0] = nandi->blocks_per_device - 1;
+ bbt_info->bbt_block[1] = nandi->blocks_per_device - 2;
+
+ for (block = 0; block < nandi->blocks_per_device; block++)
+ if (nandi_scan_bad_block_markers_block(nandi, block))
+ bbt_set_block_mark(bbt, block, BBT_MARK_BAD_FACTORY);
+
+ return 0;
+}
+
+/* Populate IBBT BCH Header */
+static void bch_fill_ibbt_header(struct nandi_controller *nandi,
+ struct nand_ibbt_bch_header *ibbt_header,
+ int bak, uint8_t vers)
+{
+ const char author[] = "STLinux " UTS_RELEASE " (stm-nand-bch)";
+
+ memcpy(ibbt_header->base.signature, ibbt_sigs[bak], NAND_IBBT_SIGLEN);
+ ibbt_header->base.version = vers;
+ memset(ibbt_header->base.schema, NAND_IBBT_SCHEMA, 4);
+
+ memset(ibbt_header->schema, NAND_IBBT_SCHEMA, 4);
+ memset(ibbt_header->ecc_size, bch_ecc_sizes[nandi->bch_ecc_mode], 4);
+ memcpy(ibbt_header->author, author, sizeof(author));
+}
+
+/* Write IBBT to Flash */
+static int bch_write_bbt_data(struct nandi_controller *nandi,
+ struct nandi_bbt_info *bbt_info,
+ uint32_t block, int bak, uint8_t vers)
+{
+ struct nand_ibbt_bch_header *ibbt_header =
+ (struct nand_ibbt_bch_header *)nandi->page_buf;
+ struct nand_chip *chip = &nandi->info.chip;
+ struct mtd_info *mtd = &nandi->info.mtd;
+ uint32_t page_size = mtd->writesize;
+ uint32_t block_size = mtd->erasesize;
+ loff_t offs;
+ size_t retlen;
+ int ret;
+
+ nandi->cached_page = -1;
+
+ /* Write BBT contents to first page of block */
+ offs = (loff_t)block << chip->phys_erase_shift;
+ ret = mtd_write(mtd, offs, page_size, &retlen, bbt_info->bbt);
+ if (ret)
+ return ret;
+
+ /* Update IBBT header and write to last page of block */
+ memset(ibbt_header, 0xff, mtd->writesize);
+ bch_fill_ibbt_header(nandi, ibbt_header, bak, vers);
+ offs += block_size - page_size;
+ ret = mtd_write(mtd, offs, sizeof(*ibbt_header), &retlen,
+ (uint8_t *)ibbt_header);
+ return ret;
+}
+
+/*
+ * Update Flash-resident BBT:
+ * erase/search suitable block, and write table data to Flash
+ */
+static int bch_update_bbt(struct nandi_controller *nandi,
+ struct nandi_bbt_info *bbt_info,
+ int bak, uint8_t vers)
+{
+ struct nand_chip *chip = &nandi->info.chip;
+ loff_t offs;
+ uint32_t block;
+ uint32_t block_lower;
+ uint32_t block_other;
+
+ block_other = bbt_info->bbt_block[(bak+1)%2];
+ block_lower = nandi->blocks_per_device - NAND_IBBT_NBLOCKS;
+
+ for (block = bbt_info->bbt_block[bak]; block >= block_lower; block--) {
+ offs = (loff_t)block << chip->phys_erase_shift;
+
+ /* Skip if block used by other table */
+ if (block == block_other)
+ continue;
+
+ /* Skip if block is marked bad */
+ if (bbt_is_block_bad(bbt_info->bbt, block))
+ continue;
+
+ /* Erase block, mark bad and skip on failure */
+ if (bch_erase_block(nandi, offs) & NAND_STATUS_FAIL) {
+ dev_info(nandi->dev,
+ "failed to erase block [%u:0x%012llx] while updating BBT\n",
+ block, offs);
+ vers++;
+ bbt_set_block_mark(bbt_info->bbt, block,
+ BBT_MARK_BAD_WEAR);
+ continue;
+ }
+
+ /* Write BBT, mark bad and skip on failure */
+ if (bch_write_bbt_data(nandi, bbt_info, block, bak, vers)) {
+ dev_info(nandi->dev,
+ "failed to write BBT to block [%u:0x%012llx]\n",
+ block, offs);
+ vers++;
+ bbt_set_block_mark(bbt_info->bbt, block,
+ BBT_MARK_BAD_WEAR);
+ continue;
+ }
+
+ /* Success */
+ bbt_info->bbt_block[bak] = block;
+ bbt_info->bbt_vers[bak] = vers;
+ break;
+ }
+
+ /* No space in BBT area */
+ if (block < block_lower) {
+ dev_err(nandi->dev, "no space left in BBT area\n");
+ dev_err(nandi->dev, "failed to update %s BBT\n", bbt_strs[bak]);
+ return -ENOSPC;
+ }
+
+ dev_info(nandi->dev, "wrote BBT [%s:%u] at 0x%012llx [%u]\n",
+ bbt_strs[bak], vers, offs, block);
+
+ return 0;
+}
+
+#define NAND_IBBT_UPDATE_PRIMARY 0x1
+#define NAND_IBBT_UPDATE_MIRROR 0x2
+#define NAND_IBBT_UPDATE_BOTH (NAND_IBBT_UPDATE_PRIMARY | \
+ NAND_IBBT_UPDATE_MIRROR)
+static char *bbt_update_strs[] = {
+ "",
+ "primary",
+ "mirror",
+ "both",
+};
+
+/*
+ * Update Flash-resident BBT(s):
+ * incrementing 'vers' number if required, and ensuring Primary
+ * and Mirror are kept in sync
+ */
+static int bch_update_bbts(struct nandi_controller *nandi,
+ struct nandi_bbt_info *bbt_info,
+ unsigned int update, uint8_t vers)
+{
+ int err;
+
+ dev_info(nandi->dev, "updating %s BBT(s)\n", bbt_update_strs[update]);
+
+ do {
+ /* Update Primary if specified */
+ if (update & NAND_IBBT_UPDATE_PRIMARY) {
+ err = bch_update_bbt(nandi, bbt_info, NAND_IBBT_PRIMARY,
+ vers);
+ /* Bail out on error (e.g. no space left in BBT area) */
+ if (err)
+ return err;
+
+ /*
+ * If update resulted in a new BBT version
+ * (e.g. Erase/Write fail on BBT block) update version
+ * here, and force update of other table.
+ */
+ if (bbt_info->bbt_vers[NAND_IBBT_PRIMARY] != vers) {
+ vers = bbt_info->bbt_vers[NAND_IBBT_PRIMARY];
+ update = NAND_IBBT_UPDATE_MIRROR;
+ }
+ }
+
+ /* Update Mirror if specified */
+ if (update & NAND_IBBT_UPDATE_MIRROR) {
+ err = bch_update_bbt(nandi, bbt_info, NAND_IBBT_MIRROR,
+ vers);
+ /* Bail out on error (e.g. no space left in BBT area) */
+ if (err)
+ return err;
+
+ /*
+ * If update resulted in a new BBT version
+ * (e.g. Erase/Write fail on BBT block) update version
+ * here, and force update of other table.
+ */
+ if (bbt_info->bbt_vers[NAND_IBBT_MIRROR] != vers) {
+ vers = bbt_info->bbt_vers[NAND_IBBT_MIRROR];
+ update = NAND_IBBT_UPDATE_PRIMARY;
+ }
+ }
+
+ /* Continue, until Primary and Mirror versions are in sync */
+ } while (bbt_info->bbt_vers[NAND_IBBT_PRIMARY] !=
+ bbt_info->bbt_vers[NAND_IBBT_MIRROR]);
+
+ return 0;
+}
+
+/* Scan block for IBBT signature */
+static int bch_find_ibbt_sig(struct nandi_controller *nandi,
+ uint32_t block, int *bak, uint8_t *vers,
+ char *author)
+{
+ struct nand_chip *chip = &nandi->info.chip;
+ struct mtd_info *mtd = &nandi->info.mtd;
+ struct nand_ibbt_bch_header *ibbt_header;
+ loff_t offs;
+ uint8_t *buf = nandi->page_buf;
+ int match_sig;
+ unsigned int b;
+ unsigned int i;
+ size_t retlen;
+ int ret;
+
+ nandi->cached_page = -1;
+
+ /* Load last page of block */
+ offs = (loff_t)block << chip->phys_erase_shift;
+ offs += mtd->erasesize - mtd->writesize;
+ ret = mtd_read(mtd, offs, sizeof(*ibbt_header), &retlen, buf);
+ if (ret < 0) {
+ dev_info(nandi->dev,
+ "Uncorrectable ECC error while scanning BBT signature at block %u [0x%012llx]\n",
+ block, offs);
+ return 0;
+ }
+ ibbt_header = (struct nand_ibbt_bch_header *)buf;
+
+ /* Test IBBT signature */
+ match_sig = 0;
+ for (b = 0; b < 2 && !match_sig; b++) {
+ match_sig = 1;
+ for (i = 0; i < NAND_IBBT_SIGLEN; i++) {
+ if (ibbt_header->base.signature[i] != ibbt_sigs[b][i]) {
+ match_sig = 0;
+ break;
+ }
+ }
+
+ }
+
+ if (!match_sig)
+ return 0; /* Failed to match IBBT signature */
+
+ /* Test IBBT schema */
+ for (i = 0; i < 4; i++)
+ if (ibbt_header->base.schema[i] != NAND_IBBT_SCHEMA)
+ return 0;
+
+ /* Test IBBT BCH schema */
+ for (i = 0; i < 4; i++)
+ if (ibbt_header->schema[i] != NAND_IBBT_BCH_SCHEMA)
+ return 0;
+
+ /* We have a match */
+ *vers = ibbt_header->base.version;
+ *bak = b - 1;
+ strncpy(author, ibbt_header->author, 64);
+
+ return 1;
+}
+
+/* Search for and load Flash-resident BBT, updating Primary/Mirror if req'd */
+static int bch_load_bbt(struct nandi_controller *nandi,
+ struct nandi_bbt_info *bbt_info)
+{
+ struct nand_chip *chip = &nandi->info.chip;
+ struct mtd_info *mtd = &nandi->info.mtd;
+ uint32_t page_size = mtd->writesize;
+ unsigned int update = 0;
+ uint32_t block;
+ loff_t offs;
+ uint8_t vers;
+ char author[64];
+ size_t retlen;
+ int ret;
+ int bak;
+
+ dev_dbg(nandi->dev, "looking for Flash-resident BBTs\n");
+
+ bbt_info->bbt_block[0] = 0;
+ bbt_info->bbt_block[1] = 0;
+ bbt_info->bbt_vers[0] = 0;
+ bbt_info->bbt_vers[1] = 0;
+
+ /* Look for IBBT signatures */
+ for (block = nandi->blocks_per_device - NAND_IBBT_NBLOCKS;
+ block < nandi->blocks_per_device;
+ block++) {
+ offs = (loff_t)block << chip->phys_erase_shift;
+
+ if (bch_find_ibbt_sig(nandi, block, &bak, &vers, author)) {
+ dev_dbg(nandi->dev,
+ "found BBT [%s:%u] at 0x%012llx [%u] (%s)\n",
+ bbt_strs[bak], vers, offs, block,
+ author);
+
+ if (bbt_info->bbt_block[bak] == 0 ||
+ ((int8_t)(bbt_info->bbt_vers[bak] - vers)) < 0) {
+ bbt_info->bbt_block[bak] = block;
+ bbt_info->bbt_vers[bak] = vers;
+ }
+ }
+ }
+
+ /* What have we found? */
+ if (bbt_info->bbt_block[0] == 0 && bbt_info->bbt_block[1] == 0) {
+ /* no primary, no mirror: return error */
+ return 1;
+ } else if (bbt_info->bbt_block[0] == 0) {
+ /* no primary: use mirror, update primary */
+ bak = 1;
+ update = NAND_IBBT_UPDATE_PRIMARY;
+ bbt_info->bbt_block[0] = nandi->blocks_per_device - 1;
+ } else if (bbt_info->bbt_block[1] == 0) {
+ /* no mirror: use primary, update mirror */
+ bak = 0;
+ update = NAND_IBBT_UPDATE_MIRROR;
+ bbt_info->bbt_block[1] = nandi->blocks_per_device - 1;
+ } else if (bbt_info->bbt_vers[0] == bbt_info->bbt_vers[1]) {
+ /* primary == mirror: use primary, no update required */
+ bak = 0;
+ } else if ((int8_t)(bbt_info->bbt_vers[1] -
+ bbt_info->bbt_vers[0]) < 0) {
+ /* primary > mirror: use primary, update mirror */
+ bak = 0;
+ update = NAND_IBBT_UPDATE_MIRROR;
+ } else {
+ /* mirror > primary: use mirror, update primary */
+ bak = 1;
+ update = NAND_IBBT_UPDATE_PRIMARY;
+ }
+
+ vers = bbt_info->bbt_vers[bak];
+ block = bbt_info->bbt_block[bak];
+ offs = (loff_t)block << chip->phys_erase_shift;
+ dev_info(nandi->dev, "using BBT [%s:%u] at 0x%012llx [%u]\n",
+ bbt_strs[bak], vers, offs, block);
+
+ /* Read BBT data */
+ ret = mtd_read(mtd, offs, page_size, &retlen, bbt_info->bbt);
+ if (ret < 0) {
+ dev_err(nandi->dev,
+ "error while reading BBT %s:%u] at 0x%012llx [%u]\n",
+ bbt_strs[bak], vers, offs, block);
+ return 1;
+ }
+
+ /* Update other BBT if required */
+ if (update)
+ bch_update_bbts(nandi, bbt_info, update, vers);
+
+ return 0;
+}
+
+int bch_scan_bbt(struct mtd_info *mtd)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nandi_controller *nandi = chip->priv;
+ struct nandi_bbt_info *bbt_info = &nandi->info.bbt_info;
+ int err;
+
+ /* Load Flash-resident BBT */
+ err = bch_load_bbt(nandi, bbt_info);
+ if (err) {
+ dev_warn(nandi->dev,
+ "failed to find BBTs:"
+ " scanning device for bad-block markers\n");
+
+ /* Scan, build, and write BBT */
+ nandi_scan_build_bbt(nandi, bbt_info);
+ err = bch_update_bbts(nandi, bbt_info, NAND_IBBT_UPDATE_BOTH,
+ bbt_info->bbt_vers[0] + 1);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+int bch_block_isbad(struct mtd_info *mtd, loff_t offs, int getchip)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nandi_controller *nandi = chip->priv;
+
+ uint32_t block;
+
+ /* Check for invalid offset */
+ if (offs > mtd->size)
+ return -EINVAL;
+
+ block = offs >> chip->phys_erase_shift;
+
+ /* Protect blocks reserved for BBTs */
+ if (block >= (nandi->blocks_per_device - NAND_IBBT_NBLOCKS))
+ return 1;
+
+ return bbt_is_block_bad(nandi->info.bbt_info.bbt, block);
+}
+
+int bch_block_markbad(struct mtd_info *mtd, loff_t offs)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nandi_controller *nandi = chip->priv;
+
+ uint32_t block;
+ int ret;
+
+ /* Mark bad */
+ block = offs >> chip->phys_erase_shift;
+ bbt_set_block_mark(nandi->info.bbt_info.bbt, block, BBT_MARK_BAD_WEAR);
+
+ /* Update BBTs, incrementing bbt_vers */
+ ret = bch_update_bbts(nandi, &nandi->info.bbt_info,
+ NAND_IBBT_UPDATE_BOTH,
+ nandi->info.bbt_info.bbt_vers[0] + 1);
+
+ return ret;
+}
+
+void nandi_dump_bad_blocks(struct nandi_controller *nandi)
+{
+ struct nand_chip *chip = &nandi->info.chip;
+ int bad_count = 0;
+ uint32_t block;
+ uint8_t *bbt = nandi->info.bbt_info.bbt;
+ uint8_t mark;
+
+ pr_info("BBT:\n");
+ for (block = 0; block < nandi->blocks_per_device; block++) {
+ mark = bbt_get_block_mark(bbt, block);
+ if (mark != BBT_MARK_GOOD) {
+ pr_info("\t\tBlock 0x%08x [%05u] marked bad [%s]\n",
+ block << chip->phys_erase_shift, block,
+ (mark == BBT_MARK_BAD_FACTORY) ?
+ "Factory" : "Wear");
+ bad_count++;
+ }
+ }
+ if (bad_count == 0)
+ pr_info("\t\tNo bad blocks listed in BBT\n");
+}
+EXPORT_SYMBOL(nandi_dump_bad_blocks);
diff --git a/include/linux/mtd/stm_nand_bbt.h b/include/linux/mtd/stm_nand_bbt.h
new file mode 100644
index 0000000..70d3c17
--- /dev/null
+++ b/include/linux/mtd/stm_nand_bbt.h
@@ -0,0 +1,17 @@
+#include <linux/mtd/stm_nand.h>
+
+/* BCH ECC sizes */
+static int bch_ecc_sizes[] = {
+ [BCH_18BIT_ECC] = 32,
+ [BCH_30BIT_ECC] = 54,
+ [BCH_NO_ECC] = 0,
+};
+
+#if defined(MTD_NAND_STM_BBT)
+extern void nandi_dump_bad_blocks(struct nandi_controller *nandi);
+extern int bch_scan_bbt(struct mtd_info *mtd);
+extern int bch_block_isbad(struct mtd_info *mtd, loff_t offs, int getchip);
+extern int bch_block_markbad(struct mtd_info *mtd, loff_t offs);
+#else
+inline void nandi_dump_bad_blocks(struct nandi_controller *nandi) {}
+#endif
--
1.9.1
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