/* * Driver for NAND MLC Controller in LPC32xx * * Author: Roland Stigge * * Copyright © 2011 WORK Microwave GmbH * Copyright © 2011, 2012 Roland Stigge * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * * NAND Flash Controller Operation: * - Read: Auto Decode * - Write: Auto Encode * - Tested Page Sizes: 2048, 4096 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DRV_NAME "lpc32xx_mlc" /********************************************************************** * MLC NAND controller register offsets **********************************************************************/ #define MLC_BUFF(x) (x + 0x00000) #define MLC_DATA(x) (x + 0x08000) #define MLC_CMD(x) (x + 0x10000) #define MLC_ADDR(x) (x + 0x10004) #define MLC_ECC_ENC_REG(x) (x + 0x10008) #define MLC_ECC_DEC_REG(x) (x + 0x1000C) #define MLC_ECC_AUTO_ENC_REG(x) (x + 0x10010) #define MLC_ECC_AUTO_DEC_REG(x) (x + 0x10014) #define MLC_RPR(x) (x + 0x10018) #define MLC_WPR(x) (x + 0x1001C) #define MLC_RUBP(x) (x + 0x10020) #define MLC_ROBP(x) (x + 0x10024) #define MLC_SW_WP_ADD_LOW(x) (x + 0x10028) #define MLC_SW_WP_ADD_HIG(x) (x + 0x1002C) #define MLC_ICR(x) (x + 0x10030) #define MLC_TIME_REG(x) (x + 0x10034) #define MLC_IRQ_MR(x) (x + 0x10038) #define MLC_IRQ_SR(x) (x + 0x1003C) #define MLC_LOCK_PR(x) (x + 0x10044) #define MLC_ISR(x) (x + 0x10048) #define MLC_CEH(x) (x + 0x1004C) /********************************************************************** * MLC_CMD bit definitions **********************************************************************/ #define MLCCMD_RESET 0xFF /********************************************************************** * MLC_ICR bit definitions **********************************************************************/ #define MLCICR_WPROT (1 << 3) #define MLCICR_LARGEBLOCK (1 << 2) #define MLCICR_LONGADDR (1 << 1) #define MLCICR_16BIT (1 << 0) /* unsupported by LPC32x0! */ /********************************************************************** * MLC_TIME_REG bit definitions **********************************************************************/ #define MLCTIMEREG_TCEA_DELAY(n) (((n) & 0x03) << 24) #define MLCTIMEREG_BUSY_DELAY(n) (((n) & 0x1F) << 19) #define MLCTIMEREG_NAND_TA(n) (((n) & 0x07) << 16) #define MLCTIMEREG_RD_HIGH(n) (((n) & 0x0F) << 12) #define MLCTIMEREG_RD_LOW(n) (((n) & 0x0F) << 8) #define MLCTIMEREG_WR_HIGH(n) (((n) & 0x0F) << 4) #define MLCTIMEREG_WR_LOW(n) (((n) & 0x0F) << 0) /********************************************************************** * MLC_IRQ_MR and MLC_IRQ_SR bit definitions **********************************************************************/ #define MLCIRQ_NAND_READY (1 << 5) #define MLCIRQ_CONTROLLER_READY (1 << 4) #define MLCIRQ_DECODE_FAILURE (1 << 3) #define MLCIRQ_DECODE_ERROR (1 << 2) #define MLCIRQ_ECC_READY (1 << 1) #define MLCIRQ_WRPROT_FAULT (1 << 0) /********************************************************************** * MLC_LOCK_PR bit definitions **********************************************************************/ #define MLCLOCKPR_MAGIC 0xA25E /********************************************************************** * MLC_ISR bit definitions **********************************************************************/ #define MLCISR_DECODER_FAILURE (1 << 6) #define MLCISR_ERRORS ((1 << 4) | (1 << 5)) #define MLCISR_ERRORS_DETECTED (1 << 3) #define MLCISR_ECC_READY (1 << 2) #define MLCISR_CONTROLLER_READY (1 << 1) #define MLCISR_NAND_READY (1 << 0) /********************************************************************** * MLC_CEH bit definitions **********************************************************************/ #define MLCCEH_NORMAL (1 << 0) struct lpc32xx_nand_cfg_mlc { uint32_t tcea_delay; uint32_t busy_delay; uint32_t nand_ta; uint32_t rd_high; uint32_t rd_low; uint32_t wr_high; uint32_t wr_low; int wp_gpio; struct mtd_partition *parts; unsigned num_parts; }; static struct nand_ecclayout lpc32xx_nand_oob = { .eccbytes = 40, .eccpos = { 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63 }, .oobfree = { { .offset = 0, .length = 6, }, { .offset = 16, .length = 6, }, { .offset = 32, .length = 6, }, { .offset = 48, .length = 6, }, }, }; static struct nand_bbt_descr lpc32xx_nand_bbt = { .options = NAND_BBT_ABSPAGE | NAND_BBT_2BIT | NAND_BBT_NO_OOB | NAND_BBT_WRITE, .pages = { 524224, 0, 0, 0, 0, 0, 0, 0 }, }; static struct nand_bbt_descr lpc32xx_nand_bbt_mirror = { .options = NAND_BBT_ABSPAGE | NAND_BBT_2BIT | NAND_BBT_NO_OOB | NAND_BBT_WRITE, .pages = { 524160, 0, 0, 0, 0, 0, 0, 0 }, }; struct lpc32xx_nand_host { struct nand_chip nand_chip; struct lpc32xx_mlc_platform_data *pdata; struct clk *clk; struct mtd_info mtd; void __iomem *io_base; int irq; struct lpc32xx_nand_cfg_mlc *ncfg; struct completion comp_nand; struct completion comp_controller; uint32_t llptr; /* * Physical addresses of ECC buffer, DMA data buffers, OOB data buffer */ dma_addr_t oob_buf_phy; /* * Virtual addresses of ECC buffer, DMA data buffers, OOB data buffer */ uint8_t *oob_buf; /* Physical address of DMA base address */ dma_addr_t io_base_phy; struct completion comp_dma; struct dma_chan *dma_chan; struct dma_slave_config dma_slave_config; struct scatterlist sgl; uint8_t *dma_buf; uint8_t *dummy_buf; int mlcsubpages; /* number of 512bytes-subpages */ }; /* * Activate/Deactivate DMA Operation: * * Using the PL080 DMA Controller for transferring the 512 byte subpages * instead of doing readl() / writel() in a loop slows it down significantly. * Measurements via getnstimeofday() upon 512 byte subpage reads reveal: * * - readl() of 128 x 32 bits in a loop: ~20us * - DMA read of 512 bytes (32 bit, 4...128 words bursts): ~60us * - DMA read of 512 bytes (32 bit, no bursts): ~100us * * This applies to the transfer itself. In the DMA case: only the * wait_for_completion() (DMA setup _not_ included). * * Note that the 512 bytes subpage transfer is done directly from/to a * FIFO/buffer inside the NAND controller. Most of the time (~400-800us for a * 2048 bytes page) is spent waiting for the NAND IRQ, anyway. (The NAND * controller transferring data between its internal buffer to/from the NAND * chip.) * * Therefore, using the PL080 DMA is disabled by default, for now. * */ static int use_dma; static void lpc32xx_nand_setup(struct lpc32xx_nand_host *host) { uint32_t clkrate, tmp; /* Reset MLC controller */ writel(MLCCMD_RESET, MLC_CMD(host->io_base)); udelay(1000); /* Get base clock for MLC block */ clkrate = clk_get_rate(host->clk); if (clkrate == 0) clkrate = 104000000; /* Unlock MLC_ICR * (among others, will be locked again automatically) */ writew(MLCLOCKPR_MAGIC, MLC_LOCK_PR(host->io_base)); /* Configure MLC Controller: Large Block, 5 Byte Address */ tmp = MLCICR_LARGEBLOCK | MLCICR_LONGADDR; writel(tmp, MLC_ICR(host->io_base)); /* Unlock MLC_TIME_REG * (among others, will be locked again automatically) */ writew(MLCLOCKPR_MAGIC, MLC_LOCK_PR(host->io_base)); /* Compute clock setup values, see LPC and NAND manual */ tmp = 0; tmp |= MLCTIMEREG_TCEA_DELAY(clkrate / host->ncfg->tcea_delay + 1); tmp |= MLCTIMEREG_BUSY_DELAY(clkrate / host->ncfg->busy_delay + 1); tmp |= MLCTIMEREG_NAND_TA(clkrate / host->ncfg->nand_ta + 1); tmp |= MLCTIMEREG_RD_HIGH(clkrate / host->ncfg->rd_high + 1); tmp |= MLCTIMEREG_RD_LOW(clkrate / host->ncfg->rd_low); tmp |= MLCTIMEREG_WR_HIGH(clkrate / host->ncfg->wr_high + 1); tmp |= MLCTIMEREG_WR_LOW(clkrate / host->ncfg->wr_low); writel(tmp, MLC_TIME_REG(host->io_base)); /* Enable IRQ for CONTROLLER_READY and NAND_READY */ writeb(MLCIRQ_CONTROLLER_READY | MLCIRQ_NAND_READY, MLC_IRQ_MR(host->io_base)); /* Normal nCE operation: nCE controlled by controller */ writel(MLCCEH_NORMAL, MLC_CEH(host->io_base)); } /* * Hardware specific access to control lines */ static void lpc32xx_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) { struct nand_chip *nand_chip = mtd->priv; struct lpc32xx_nand_host *host = nand_chip->priv; if (cmd != NAND_CMD_NONE) { if (ctrl & NAND_CLE) writel(cmd, MLC_CMD(host->io_base)); else writel(cmd, MLC_ADDR(host->io_base)); } } /* * Read Device Ready (NAND device _and_ controller ready) */ static int lpc32xx_nand_device_ready(struct mtd_info *mtd) { struct nand_chip *nand_chip = mtd->priv; struct lpc32xx_nand_host *host = nand_chip->priv; if ((readb(MLC_ISR(host->io_base)) & (MLCISR_CONTROLLER_READY | MLCISR_NAND_READY)) == (MLCISR_CONTROLLER_READY | MLCISR_NAND_READY)) return 1; return 0; } static irqreturn_t lpc3xxx_nand_irq(int irq, struct lpc32xx_nand_host *host) { uint8_t sr; /* Clear interrupt flag by reading status */ sr = readb(MLC_IRQ_SR(host->io_base)); if (sr & MLCIRQ_NAND_READY) complete(&host->comp_nand); if (sr & MLCIRQ_CONTROLLER_READY) complete(&host->comp_controller); return IRQ_HANDLED; } static int lpc32xx_waitfunc_nand(struct mtd_info *mtd, struct nand_chip *chip) { struct lpc32xx_nand_host *host = chip->priv; if (readb(MLC_ISR(host->io_base)) & MLCISR_NAND_READY) goto exit; wait_for_completion(&host->comp_nand); while (!(readb(MLC_ISR(host->io_base)) & MLCISR_NAND_READY)) { /* Seems to be delayed sometimes by controller */ dev_dbg(&mtd->dev, "Warning: NAND not ready.\n"); cpu_relax(); } exit: return NAND_STATUS_READY; } static int lpc32xx_waitfunc_controller(struct mtd_info *mtd, struct nand_chip *chip) { struct lpc32xx_nand_host *host = chip->priv; if (readb(MLC_ISR(host->io_base)) & MLCISR_CONTROLLER_READY) goto exit; wait_for_completion(&host->comp_controller); while (!(readb(MLC_ISR(host->io_base)) & MLCISR_CONTROLLER_READY)) { dev_dbg(&mtd->dev, "Warning: Controller not ready.\n"); cpu_relax(); } exit: return NAND_STATUS_READY; } static int lpc32xx_waitfunc(struct mtd_info *mtd, struct nand_chip *chip) { lpc32xx_waitfunc_nand(mtd, chip); lpc32xx_waitfunc_controller(mtd, chip); return NAND_STATUS_READY; } /* * Enable NAND write protect */ static void lpc32xx_wp_enable(struct lpc32xx_nand_host *host) { if (gpio_is_valid(host->ncfg->wp_gpio)) gpio_set_value(host->ncfg->wp_gpio, 0); } /* * Disable NAND write protect */ static void lpc32xx_wp_disable(struct lpc32xx_nand_host *host) { if (gpio_is_valid(host->ncfg->wp_gpio)) gpio_set_value(host->ncfg->wp_gpio, 1); } static void lpc32xx_dma_complete_func(void *completion) { complete(completion); } static int lpc32xx_xmit_dma(struct mtd_info *mtd, void *mem, int len, enum dma_transfer_direction dir) { struct nand_chip *chip = mtd->priv; struct lpc32xx_nand_host *host = chip->priv; struct dma_async_tx_descriptor *desc; int flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT; int res; sg_init_one(&host->sgl, mem, len); res = dma_map_sg(host->dma_chan->device->dev, &host->sgl, 1, DMA_BIDIRECTIONAL); if (res != 1) { dev_err(mtd->dev.parent, "Failed to map sg list\n"); return -ENXIO; } desc = dmaengine_prep_slave_sg(host->dma_chan, &host->sgl, 1, dir, flags); if (!desc) { dev_err(mtd->dev.parent, "Failed to prepare slave sg\n"); goto out1; } init_completion(&host->comp_dma); desc->callback = lpc32xx_dma_complete_func; desc->callback_param = &host->comp_dma; dmaengine_submit(desc); dma_async_issue_pending(host->dma_chan); wait_for_completion_timeout(&host->comp_dma, msecs_to_jiffies(1000)); dma_unmap_sg(host->dma_chan->device->dev, &host->sgl, 1, DMA_BIDIRECTIONAL); return 0; out1: dma_unmap_sg(host->dma_chan->device->dev, &host->sgl, 1, DMA_BIDIRECTIONAL); return -ENXIO; } static int lpc32xx_read_page(struct mtd_info *mtd, struct nand_chip *chip, uint8_t *buf, int oob_required, int page) { struct lpc32xx_nand_host *host = chip->priv; int i, j; uint8_t *oobbuf = chip->oob_poi; uint32_t mlc_isr; int res; uint8_t *dma_buf; bool dma_mapped; if ((void *)buf <= high_memory) { dma_buf = buf; dma_mapped = true; } else { dma_buf = host->dma_buf; dma_mapped = false; } /* Writing Command and Address */ chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page); /* For all sub-pages */ for (i = 0; i < host->mlcsubpages; i++) { /* Start Auto Decode Command */ writeb(0x00, MLC_ECC_AUTO_DEC_REG(host->io_base)); /* Wait for Controller Ready */ lpc32xx_waitfunc_controller(mtd, chip); /* Check ECC Error status */ mlc_isr = readl(MLC_ISR(host->io_base)); if (mlc_isr & MLCISR_DECODER_FAILURE) { mtd->ecc_stats.failed++; dev_warn(&mtd->dev, "%s: DECODER_FAILURE\n", __func__); } else if (mlc_isr & MLCISR_ERRORS_DETECTED) { mtd->ecc_stats.corrected += ((mlc_isr >> 4) & 0x3) + 1; } /* Read 512 + 16 Bytes */ if (use_dma) { res = lpc32xx_xmit_dma(mtd, dma_buf + i * 512, 512, DMA_DEV_TO_MEM); if (res) return res; } else { for (j = 0; j < (512 >> 2); j++) { *((uint32_t *)(buf)) = readl(MLC_BUFF(host->io_base)); buf += 4; } } for (j = 0; j < (16 >> 2); j++) { *((uint32_t *)(oobbuf)) = readl(MLC_BUFF(host->io_base)); oobbuf += 4; } } if (use_dma && !dma_mapped) memcpy(buf, dma_buf, mtd->writesize); return 0; } static int lpc32xx_write_page_lowlevel(struct mtd_info *mtd, struct nand_chip *chip, const uint8_t *buf, int oob_required) { struct lpc32xx_nand_host *host = chip->priv; const uint8_t *oobbuf = chip->oob_poi; uint8_t *dma_buf = (uint8_t *)buf; int res; int i, j; if (use_dma && (void *)buf >= high_memory) { dma_buf = host->dma_buf; memcpy(dma_buf, buf, mtd->writesize); } for (i = 0; i < host->mlcsubpages; i++) { /* Start Encode */ writeb(0x00, MLC_ECC_ENC_REG(host->io_base)); /* Write 512 + 6 Bytes to Buffer */ if (use_dma) { res = lpc32xx_xmit_dma(mtd, dma_buf + i * 512, 512, DMA_MEM_TO_DEV); if (res) return res; } else { for (j = 0; j < (512 >> 2); j++) { writel(*((uint32_t *)(buf)), MLC_BUFF(host->io_base)); buf += 4; } } writel(*((uint32_t *)(oobbuf)), MLC_BUFF(host->io_base)); oobbuf += 4; writew(*((uint16_t *)(oobbuf)), MLC_BUFF(host->io_base)); oobbuf += 12; /* Auto Encode w/ Bit 8 = 0 (see LPC MLC Controller manual) */ writeb(0x00, MLC_ECC_AUTO_ENC_REG(host->io_base)); /* Wait for Controller Ready */ lpc32xx_waitfunc_controller(mtd, chip); } return 0; } static int lpc32xx_write_page(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) { int res; chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page); res = lpc32xx_write_page_lowlevel(mtd, chip, buf, oob_required); chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1); lpc32xx_waitfunc(mtd, chip); return res; } static int lpc32xx_read_oob(struct mtd_info *mtd, struct nand_chip *chip, int page) { struct lpc32xx_nand_host *host = chip->priv; /* Read whole page - necessary with MLC controller! */ lpc32xx_read_page(mtd, chip, host->dummy_buf, 1, page); return 0; } static int lpc32xx_write_oob(struct mtd_info *mtd, struct nand_chip *chip, int page) { /* None, write_oob conflicts with the automatic LPC MLC ECC decoder! */ return 0; } /* Prepares MLC for transfers with H/W ECC enabled: always enabled anyway */ static void lpc32xx_ecc_enable(struct mtd_info *mtd, int mode) { /* Always enabled! */ } static int lpc32xx_dma_setup(struct lpc32xx_nand_host *host) { struct mtd_info *mtd = &host->mtd; dma_cap_mask_t mask; if (!host->pdata || !host->pdata->dma_filter) { dev_err(mtd->dev.parent, "no DMA platform data\n"); return -ENOENT; } dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); host->dma_chan = dma_request_channel(mask, host->pdata->dma_filter, "nand-mlc"); if (!host->dma_chan) { dev_err(mtd->dev.parent, "Failed to request DMA channel\n"); return -EBUSY; } /* * Set direction to a sensible value even if the dmaengine driver * should ignore it. With the default (DMA_MEM_TO_MEM), the amba-pl08x * driver criticizes it as "alien transfer direction". */ host->dma_slave_config.direction = DMA_DEV_TO_MEM; host->dma_slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; host->dma_slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; host->dma_slave_config.src_maxburst = 128; host->dma_slave_config.dst_maxburst = 128; /* DMA controller does flow control: */ host->dma_slave_config.device_fc = false; host->dma_slave_config.src_addr = MLC_BUFF(host->io_base_phy); host->dma_slave_config.dst_addr = MLC_BUFF(host->io_base_phy); if (dmaengine_slave_config(host->dma_chan, &host->dma_slave_config)) { dev_err(mtd->dev.parent, "Failed to setup DMA slave\n"); goto out1; } return 0; out1: dma_release_channel(host->dma_chan); return -ENXIO; } static struct lpc32xx_nand_cfg_mlc *lpc32xx_parse_dt(struct device *dev) { struct lpc32xx_nand_cfg_mlc *ncfg; struct device_node *np = dev->of_node; ncfg = devm_kzalloc(dev, sizeof(*ncfg), GFP_KERNEL); if (!ncfg) { dev_err(dev, "could not allocate memory for platform data\n"); return NULL; } of_property_read_u32(np, "nxp,tcea-delay", &ncfg->tcea_delay); of_property_read_u32(np, "nxp,busy-delay", &ncfg->busy_delay); of_property_read_u32(np, "nxp,nand-ta", &ncfg->nand_ta); of_property_read_u32(np, "nxp,rd-high", &ncfg->rd_high); of_property_read_u32(np, "nxp,rd-low", &ncfg->rd_low); of_property_read_u32(np, "nxp,wr-high", &ncfg->wr_high); of_property_read_u32(np, "nxp,wr-low", &ncfg->wr_low); if (!ncfg->tcea_delay || !ncfg->busy_delay || !ncfg->nand_ta || !ncfg->rd_high || !ncfg->rd_low || !ncfg->wr_high || !ncfg->wr_low) { dev_err(dev, "chip parameters not specified correctly\n"); return NULL; } ncfg->wp_gpio = of_get_named_gpio(np, "gpios", 0); return ncfg; } /* * Probe for NAND controller */ static int lpc32xx_nand_probe(struct platform_device *pdev) { struct lpc32xx_nand_host *host; struct mtd_info *mtd; struct nand_chip *nand_chip; struct resource *rc; int res; struct mtd_part_parser_data ppdata = {}; /* Allocate memory for the device structure (and zero it) */ host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL); if (!host) { dev_err(&pdev->dev, "failed to allocate device structure.\n"); return -ENOMEM; } rc = platform_get_resource(pdev, IORESOURCE_MEM, 0); host->io_base = devm_ioremap_resource(&pdev->dev, rc); if (IS_ERR(host->io_base)) return PTR_ERR(host->io_base); host->io_base_phy = rc->start; mtd = &host->mtd; nand_chip = &host->nand_chip; if (pdev->dev.of_node) host->ncfg = lpc32xx_parse_dt(&pdev->dev); if (!host->ncfg) { dev_err(&pdev->dev, "Missing or bad NAND config from device tree\n"); return -ENOENT; } if (host->ncfg->wp_gpio == -EPROBE_DEFER) return -EPROBE_DEFER; if (gpio_is_valid(host->ncfg->wp_gpio) && gpio_request(host->ncfg->wp_gpio, "NAND WP")) { dev_err(&pdev->dev, "GPIO not available\n"); return -EBUSY; } lpc32xx_wp_disable(host); host->pdata = pdev->dev.platform_data; nand_chip->priv = host; /* link the private data structures */ mtd->priv = nand_chip; mtd->owner = THIS_MODULE; mtd->dev.parent = &pdev->dev; /* Get NAND clock */ host->clk = clk_get(&pdev->dev, NULL); if (IS_ERR(host->clk)) { dev_err(&pdev->dev, "Clock initialization failure\n"); res = -ENOENT; goto err_exit1; } clk_enable(host->clk); nand_chip->cmd_ctrl = lpc32xx_nand_cmd_ctrl; nand_chip->dev_ready = lpc32xx_nand_device_ready; nand_chip->chip_delay = 25; /* us */ nand_chip->IO_ADDR_R = MLC_DATA(host->io_base); nand_chip->IO_ADDR_W = MLC_DATA(host->io_base); /* Init NAND controller */ lpc32xx_nand_setup(host); platform_set_drvdata(pdev, host); /* Initialize function pointers */ nand_chip->ecc.hwctl = lpc32xx_ecc_enable; nand_chip->ecc.read_page_raw = lpc32xx_read_page; nand_chip->ecc.read_page = lpc32xx_read_page; nand_chip->ecc.write_page_raw = lpc32xx_write_page_lowlevel; nand_chip->ecc.write_page = lpc32xx_write_page_lowlevel; nand_chip->ecc.write_oob = lpc32xx_write_oob; nand_chip->ecc.read_oob = lpc32xx_read_oob; nand_chip->ecc.strength = 4; nand_chip->write_page = lpc32xx_write_page; nand_chip->waitfunc = lpc32xx_waitfunc; nand_chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB; nand_chip->bbt_td = &lpc32xx_nand_bbt; nand_chip->bbt_md = &lpc32xx_nand_bbt_mirror; /* bitflip_threshold's default is defined as ecc_strength anyway. * Unfortunately, it is set only later at add_mtd_device(). Meanwhile * being 0, it causes bad block table scanning errors in * nand_scan_tail(), so preparing it here. */ mtd->bitflip_threshold = nand_chip->ecc.strength; if (use_dma) { res = lpc32xx_dma_setup(host); if (res) { res = -EIO; goto err_exit2; } } /* * Scan to find existance of the device and * Get the type of NAND device SMALL block or LARGE block */ if (nand_scan_ident(mtd, 1, NULL)) { res = -ENXIO; goto err_exit3; } host->dma_buf = devm_kzalloc(&pdev->dev, mtd->writesize, GFP_KERNEL); if (!host->dma_buf) { dev_err(&pdev->dev, "Error allocating dma_buf memory\n"); res = -ENOMEM; goto err_exit3; } host->dummy_buf = devm_kzalloc(&pdev->dev, mtd->writesize, GFP_KERNEL); if (!host->dummy_buf) { dev_err(&pdev->dev, "Error allocating dummy_buf memory\n"); res = -ENOMEM; goto err_exit3; } nand_chip->ecc.mode = NAND_ECC_HW; nand_chip->ecc.size = mtd->writesize; nand_chip->ecc.layout = &lpc32xx_nand_oob; host->mlcsubpages = mtd->writesize / 512; /* initially clear interrupt status */ readb(MLC_IRQ_SR(host->io_base)); init_completion(&host->comp_nand); init_completion(&host->comp_controller); host->irq = platform_get_irq(pdev, 0); if ((host->irq < 0) || (host->irq >= NR_IRQS)) { dev_err(&pdev->dev, "failed to get platform irq\n"); res = -EINVAL; goto err_exit3; } if (request_irq(host->irq, (irq_handler_t)&lpc3xxx_nand_irq, IRQF_TRIGGER_HIGH, DRV_NAME, host)) { dev_err(&pdev->dev, "Error requesting NAND IRQ\n"); res = -ENXIO; goto err_exit3; } /* * Fills out all the uninitialized function pointers with the defaults * And scans for a bad block table if appropriate. */ if (nand_scan_tail(mtd)) { res = -ENXIO; goto err_exit4; } mtd->name = DRV_NAME; ppdata.of_node = pdev->dev.of_node; res = mtd_device_parse_register(mtd, NULL, &ppdata, host->ncfg->parts, host->ncfg->num_parts); if (!res) return res; nand_release(mtd); err_exit4: free_irq(host->irq, host); err_exit3: if (use_dma) dma_release_channel(host->dma_chan); err_exit2: clk_disable(host->clk); clk_put(host->clk); platform_set_drvdata(pdev, NULL); err_exit1: lpc32xx_wp_enable(host); gpio_free(host->ncfg->wp_gpio); return res; } /* * Remove NAND device */ static int lpc32xx_nand_remove(struct platform_device *pdev) { struct lpc32xx_nand_host *host = platform_get_drvdata(pdev); struct mtd_info *mtd = &host->mtd; nand_release(mtd); free_irq(host->irq, host); if (use_dma) dma_release_channel(host->dma_chan); clk_disable(host->clk); clk_put(host->clk); platform_set_drvdata(pdev, NULL); lpc32xx_wp_enable(host); gpio_free(host->ncfg->wp_gpio); return 0; } #ifdef CONFIG_PM static int lpc32xx_nand_resume(struct platform_device *pdev) { struct lpc32xx_nand_host *host = platform_get_drvdata(pdev); /* Re-enable NAND clock */ clk_enable(host->clk); /* Fresh init of NAND controller */ lpc32xx_nand_setup(host); /* Disable write protect */ lpc32xx_wp_disable(host); return 0; } static int lpc32xx_nand_suspend(struct platform_device *pdev, pm_message_t pm) { struct lpc32xx_nand_host *host = platform_get_drvdata(pdev); /* Enable write protect for safety */ lpc32xx_wp_enable(host); /* Disable clock */ clk_disable(host->clk); return 0; } #else #define lpc32xx_nand_resume NULL #define lpc32xx_nand_suspend NULL #endif static const struct of_device_id lpc32xx_nand_match[] = { { .compatible = "nxp,lpc3220-mlc" }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, lpc32xx_nand_match); static struct platform_driver lpc32xx_nand_driver = { .probe = lpc32xx_nand_probe, .remove = lpc32xx_nand_remove, .resume = lpc32xx_nand_resume, .suspend = lpc32xx_nand_suspend, .driver = { .name = DRV_NAME, .owner = THIS_MODULE, .of_match_table = of_match_ptr(lpc32xx_nand_match), }, }; module_platform_driver(lpc32xx_nand_driver); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Roland Stigge "); MODULE_DESCRIPTION("NAND driver for the NXP LPC32XX MLC controller");