diff options
Diffstat (limited to 'drivers/mtd/nand/sh_flctl.c')
| -rw-r--r-- | drivers/mtd/nand/sh_flctl.c | 1200 |
1 files changed, 1200 insertions, 0 deletions
diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c new file mode 100644 index 000000000..c3ce81c1a --- /dev/null +++ b/drivers/mtd/nand/sh_flctl.c @@ -0,0 +1,1200 @@ +/* + * SuperH FLCTL nand controller + * + * Copyright (c) 2008 Renesas Solutions Corp. + * Copyright (c) 2008 Atom Create Engineering Co., Ltd. + * + * Based on fsl_elbc_nand.c, Copyright (c) 2006-2007 Freescale Semiconductor + * + * 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; version 2 of the License. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_mtd.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/sh_dma.h> +#include <linux/slab.h> +#include <linux/string.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/partitions.h> +#include <linux/mtd/sh_flctl.h> + +static struct nand_ecclayout flctl_4secc_oob_16 = { + .eccbytes = 10, + .eccpos = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, + .oobfree = { + {.offset = 12, + . length = 4} }, +}; + +static struct nand_ecclayout flctl_4secc_oob_64 = { + .eccbytes = 4 * 10, + .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 = 2, .length = 4}, + {.offset = 16, .length = 6}, + {.offset = 32, .length = 6}, + {.offset = 48, .length = 6} }, +}; + +static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; + +static struct nand_bbt_descr flctl_4secc_smallpage = { + .options = NAND_BBT_SCAN2NDPAGE, + .offs = 11, + .len = 1, + .pattern = scan_ff_pattern, +}; + +static struct nand_bbt_descr flctl_4secc_largepage = { + .options = NAND_BBT_SCAN2NDPAGE, + .offs = 0, + .len = 2, + .pattern = scan_ff_pattern, +}; + +static void empty_fifo(struct sh_flctl *flctl) +{ + writel(flctl->flintdmacr_base | AC1CLR | AC0CLR, FLINTDMACR(flctl)); + writel(flctl->flintdmacr_base, FLINTDMACR(flctl)); +} + +static void start_translation(struct sh_flctl *flctl) +{ + writeb(TRSTRT, FLTRCR(flctl)); +} + +static void timeout_error(struct sh_flctl *flctl, const char *str) +{ + dev_err(&flctl->pdev->dev, "Timeout occurred in %s\n", str); +} + +static void wait_completion(struct sh_flctl *flctl) +{ + uint32_t timeout = LOOP_TIMEOUT_MAX; + + while (timeout--) { + if (readb(FLTRCR(flctl)) & TREND) { + writeb(0x0, FLTRCR(flctl)); + return; + } + udelay(1); + } + + timeout_error(flctl, __func__); + writeb(0x0, FLTRCR(flctl)); +} + +static void flctl_dma_complete(void *param) +{ + struct sh_flctl *flctl = param; + + complete(&flctl->dma_complete); +} + +static void flctl_release_dma(struct sh_flctl *flctl) +{ + if (flctl->chan_fifo0_rx) { + dma_release_channel(flctl->chan_fifo0_rx); + flctl->chan_fifo0_rx = NULL; + } + if (flctl->chan_fifo0_tx) { + dma_release_channel(flctl->chan_fifo0_tx); + flctl->chan_fifo0_tx = NULL; + } +} + +static void flctl_setup_dma(struct sh_flctl *flctl) +{ + dma_cap_mask_t mask; + struct dma_slave_config cfg; + struct platform_device *pdev = flctl->pdev; + struct sh_flctl_platform_data *pdata = dev_get_platdata(&pdev->dev); + int ret; + + if (!pdata) + return; + + if (pdata->slave_id_fifo0_tx <= 0 || pdata->slave_id_fifo0_rx <= 0) + return; + + /* We can only either use DMA for both Tx and Rx or not use it at all */ + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + flctl->chan_fifo0_tx = dma_request_channel(mask, shdma_chan_filter, + (void *)(uintptr_t)pdata->slave_id_fifo0_tx); + dev_dbg(&pdev->dev, "%s: TX: got channel %p\n", __func__, + flctl->chan_fifo0_tx); + + if (!flctl->chan_fifo0_tx) + return; + + memset(&cfg, 0, sizeof(cfg)); + cfg.direction = DMA_MEM_TO_DEV; + cfg.dst_addr = (dma_addr_t)FLDTFIFO(flctl); + cfg.src_addr = 0; + ret = dmaengine_slave_config(flctl->chan_fifo0_tx, &cfg); + if (ret < 0) + goto err; + + flctl->chan_fifo0_rx = dma_request_channel(mask, shdma_chan_filter, + (void *)(uintptr_t)pdata->slave_id_fifo0_rx); + dev_dbg(&pdev->dev, "%s: RX: got channel %p\n", __func__, + flctl->chan_fifo0_rx); + + if (!flctl->chan_fifo0_rx) + goto err; + + cfg.direction = DMA_DEV_TO_MEM; + cfg.dst_addr = 0; + cfg.src_addr = (dma_addr_t)FLDTFIFO(flctl); + ret = dmaengine_slave_config(flctl->chan_fifo0_rx, &cfg); + if (ret < 0) + goto err; + + init_completion(&flctl->dma_complete); + + return; + +err: + flctl_release_dma(flctl); +} + +static void set_addr(struct mtd_info *mtd, int column, int page_addr) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + uint32_t addr = 0; + + if (column == -1) { + addr = page_addr; /* ERASE1 */ + } else if (page_addr != -1) { + /* SEQIN, READ0, etc.. */ + if (flctl->chip.options & NAND_BUSWIDTH_16) + column >>= 1; + if (flctl->page_size) { + addr = column & 0x0FFF; + addr |= (page_addr & 0xff) << 16; + addr |= ((page_addr >> 8) & 0xff) << 24; + /* big than 128MB */ + if (flctl->rw_ADRCNT == ADRCNT2_E) { + uint32_t addr2; + addr2 = (page_addr >> 16) & 0xff; + writel(addr2, FLADR2(flctl)); + } + } else { + addr = column; + addr |= (page_addr & 0xff) << 8; + addr |= ((page_addr >> 8) & 0xff) << 16; + addr |= ((page_addr >> 16) & 0xff) << 24; + } + } + writel(addr, FLADR(flctl)); +} + +static void wait_rfifo_ready(struct sh_flctl *flctl) +{ + uint32_t timeout = LOOP_TIMEOUT_MAX; + + while (timeout--) { + uint32_t val; + /* check FIFO */ + val = readl(FLDTCNTR(flctl)) >> 16; + if (val & 0xFF) + return; + udelay(1); + } + timeout_error(flctl, __func__); +} + +static void wait_wfifo_ready(struct sh_flctl *flctl) +{ + uint32_t len, timeout = LOOP_TIMEOUT_MAX; + + while (timeout--) { + /* check FIFO */ + len = (readl(FLDTCNTR(flctl)) >> 16) & 0xFF; + if (len >= 4) + return; + udelay(1); + } + timeout_error(flctl, __func__); +} + +static enum flctl_ecc_res_t wait_recfifo_ready + (struct sh_flctl *flctl, int sector_number) +{ + uint32_t timeout = LOOP_TIMEOUT_MAX; + void __iomem *ecc_reg[4]; + int i; + int state = FL_SUCCESS; + uint32_t data, size; + + /* + * First this loops checks in FLDTCNTR if we are ready to read out the + * oob data. This is the case if either all went fine without errors or + * if the bottom part of the loop corrected the errors or marked them as + * uncorrectable and the controller is given time to push the data into + * the FIFO. + */ + while (timeout--) { + /* check if all is ok and we can read out the OOB */ + size = readl(FLDTCNTR(flctl)) >> 24; + if ((size & 0xFF) == 4) + return state; + + /* check if a correction code has been calculated */ + if (!(readl(FL4ECCCR(flctl)) & _4ECCEND)) { + /* + * either we wait for the fifo to be filled or a + * correction pattern is being generated + */ + udelay(1); + continue; + } + + /* check for an uncorrectable error */ + if (readl(FL4ECCCR(flctl)) & _4ECCFA) { + /* check if we face a non-empty page */ + for (i = 0; i < 512; i++) { + if (flctl->done_buff[i] != 0xff) { + state = FL_ERROR; /* can't correct */ + break; + } + } + + if (state == FL_SUCCESS) + dev_dbg(&flctl->pdev->dev, + "reading empty sector %d, ecc error ignored\n", + sector_number); + + writel(0, FL4ECCCR(flctl)); + continue; + } + + /* start error correction */ + ecc_reg[0] = FL4ECCRESULT0(flctl); + ecc_reg[1] = FL4ECCRESULT1(flctl); + ecc_reg[2] = FL4ECCRESULT2(flctl); + ecc_reg[3] = FL4ECCRESULT3(flctl); + + for (i = 0; i < 3; i++) { + uint8_t org; + unsigned int index; + + data = readl(ecc_reg[i]); + + if (flctl->page_size) + index = (512 * sector_number) + + (data >> 16); + else + index = data >> 16; + + org = flctl->done_buff[index]; + flctl->done_buff[index] = org ^ (data & 0xFF); + } + state = FL_REPAIRABLE; + writel(0, FL4ECCCR(flctl)); + } + + timeout_error(flctl, __func__); + return FL_TIMEOUT; /* timeout */ +} + +static void wait_wecfifo_ready(struct sh_flctl *flctl) +{ + uint32_t timeout = LOOP_TIMEOUT_MAX; + uint32_t len; + + while (timeout--) { + /* check FLECFIFO */ + len = (readl(FLDTCNTR(flctl)) >> 24) & 0xFF; + if (len >= 4) + return; + udelay(1); + } + timeout_error(flctl, __func__); +} + +static int flctl_dma_fifo0_transfer(struct sh_flctl *flctl, unsigned long *buf, + int len, enum dma_data_direction dir) +{ + struct dma_async_tx_descriptor *desc = NULL; + struct dma_chan *chan; + enum dma_transfer_direction tr_dir; + dma_addr_t dma_addr; + dma_cookie_t cookie = -EINVAL; + uint32_t reg; + int ret; + + if (dir == DMA_FROM_DEVICE) { + chan = flctl->chan_fifo0_rx; + tr_dir = DMA_DEV_TO_MEM; + } else { + chan = flctl->chan_fifo0_tx; + tr_dir = DMA_MEM_TO_DEV; + } + + dma_addr = dma_map_single(chan->device->dev, buf, len, dir); + + if (dma_addr) + desc = dmaengine_prep_slave_single(chan, dma_addr, len, + tr_dir, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + + if (desc) { + reg = readl(FLINTDMACR(flctl)); + reg |= DREQ0EN; + writel(reg, FLINTDMACR(flctl)); + + desc->callback = flctl_dma_complete; + desc->callback_param = flctl; + cookie = dmaengine_submit(desc); + + dma_async_issue_pending(chan); + } else { + /* DMA failed, fall back to PIO */ + flctl_release_dma(flctl); + dev_warn(&flctl->pdev->dev, + "DMA failed, falling back to PIO\n"); + ret = -EIO; + goto out; + } + + ret = + wait_for_completion_timeout(&flctl->dma_complete, + msecs_to_jiffies(3000)); + + if (ret <= 0) { + dmaengine_terminate_all(chan); + dev_err(&flctl->pdev->dev, "wait_for_completion_timeout\n"); + } + +out: + reg = readl(FLINTDMACR(flctl)); + reg &= ~DREQ0EN; + writel(reg, FLINTDMACR(flctl)); + + dma_unmap_single(chan->device->dev, dma_addr, len, dir); + + /* ret > 0 is success */ + return ret; +} + +static void read_datareg(struct sh_flctl *flctl, int offset) +{ + unsigned long data; + unsigned long *buf = (unsigned long *)&flctl->done_buff[offset]; + + wait_completion(flctl); + + data = readl(FLDATAR(flctl)); + *buf = le32_to_cpu(data); +} + +static void read_fiforeg(struct sh_flctl *flctl, int rlen, int offset) +{ + int i, len_4align; + unsigned long *buf = (unsigned long *)&flctl->done_buff[offset]; + + len_4align = (rlen + 3) / 4; + + /* initiate DMA transfer */ + if (flctl->chan_fifo0_rx && rlen >= 32 && + flctl_dma_fifo0_transfer(flctl, buf, rlen, DMA_DEV_TO_MEM) > 0) + goto convert; /* DMA success */ + + /* do polling transfer */ + for (i = 0; i < len_4align; i++) { + wait_rfifo_ready(flctl); + buf[i] = readl(FLDTFIFO(flctl)); + } + +convert: + for (i = 0; i < len_4align; i++) + buf[i] = be32_to_cpu(buf[i]); +} + +static enum flctl_ecc_res_t read_ecfiforeg + (struct sh_flctl *flctl, uint8_t *buff, int sector) +{ + int i; + enum flctl_ecc_res_t res; + unsigned long *ecc_buf = (unsigned long *)buff; + + res = wait_recfifo_ready(flctl , sector); + + if (res != FL_ERROR) { + for (i = 0; i < 4; i++) { + ecc_buf[i] = readl(FLECFIFO(flctl)); + ecc_buf[i] = be32_to_cpu(ecc_buf[i]); + } + } + + return res; +} + +static void write_fiforeg(struct sh_flctl *flctl, int rlen, + unsigned int offset) +{ + int i, len_4align; + unsigned long *buf = (unsigned long *)&flctl->done_buff[offset]; + + len_4align = (rlen + 3) / 4; + for (i = 0; i < len_4align; i++) { + wait_wfifo_ready(flctl); + writel(cpu_to_be32(buf[i]), FLDTFIFO(flctl)); + } +} + +static void write_ec_fiforeg(struct sh_flctl *flctl, int rlen, + unsigned int offset) +{ + int i, len_4align; + unsigned long *buf = (unsigned long *)&flctl->done_buff[offset]; + + len_4align = (rlen + 3) / 4; + + for (i = 0; i < len_4align; i++) + buf[i] = cpu_to_be32(buf[i]); + + /* initiate DMA transfer */ + if (flctl->chan_fifo0_tx && rlen >= 32 && + flctl_dma_fifo0_transfer(flctl, buf, rlen, DMA_MEM_TO_DEV) > 0) + return; /* DMA success */ + + /* do polling transfer */ + for (i = 0; i < len_4align; i++) { + wait_wecfifo_ready(flctl); + writel(buf[i], FLECFIFO(flctl)); + } +} + +static void set_cmd_regs(struct mtd_info *mtd, uint32_t cmd, uint32_t flcmcdr_val) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + uint32_t flcmncr_val = flctl->flcmncr_base & ~SEL_16BIT; + uint32_t flcmdcr_val, addr_len_bytes = 0; + + /* Set SNAND bit if page size is 2048byte */ + if (flctl->page_size) + flcmncr_val |= SNAND_E; + else + flcmncr_val &= ~SNAND_E; + + /* default FLCMDCR val */ + flcmdcr_val = DOCMD1_E | DOADR_E; + + /* Set for FLCMDCR */ + switch (cmd) { + case NAND_CMD_ERASE1: + addr_len_bytes = flctl->erase_ADRCNT; + flcmdcr_val |= DOCMD2_E; + break; + case NAND_CMD_READ0: + case NAND_CMD_READOOB: + case NAND_CMD_RNDOUT: + addr_len_bytes = flctl->rw_ADRCNT; + flcmdcr_val |= CDSRC_E; + if (flctl->chip.options & NAND_BUSWIDTH_16) + flcmncr_val |= SEL_16BIT; + break; + case NAND_CMD_SEQIN: + /* This case is that cmd is READ0 or READ1 or READ00 */ + flcmdcr_val &= ~DOADR_E; /* ONLY execute 1st cmd */ + break; + case NAND_CMD_PAGEPROG: + addr_len_bytes = flctl->rw_ADRCNT; + flcmdcr_val |= DOCMD2_E | CDSRC_E | SELRW; + if (flctl->chip.options & NAND_BUSWIDTH_16) + flcmncr_val |= SEL_16BIT; + break; + case NAND_CMD_READID: + flcmncr_val &= ~SNAND_E; + flcmdcr_val |= CDSRC_E; + addr_len_bytes = ADRCNT_1; + break; + case NAND_CMD_STATUS: + case NAND_CMD_RESET: + flcmncr_val &= ~SNAND_E; + flcmdcr_val &= ~(DOADR_E | DOSR_E); + break; + default: + break; + } + + /* Set address bytes parameter */ + flcmdcr_val |= addr_len_bytes; + + /* Now actually write */ + writel(flcmncr_val, FLCMNCR(flctl)); + writel(flcmdcr_val, FLCMDCR(flctl)); + writel(flcmcdr_val, FLCMCDR(flctl)); +} + +static int flctl_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip, + uint8_t *buf, int oob_required, int page) +{ + chip->read_buf(mtd, buf, mtd->writesize); + if (oob_required) + chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); + return 0; +} + +static int flctl_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip, + const uint8_t *buf, int oob_required) +{ + chip->write_buf(mtd, buf, mtd->writesize); + chip->write_buf(mtd, chip->oob_poi, mtd->oobsize); + return 0; +} + +static void execmd_read_page_sector(struct mtd_info *mtd, int page_addr) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + int sector, page_sectors; + enum flctl_ecc_res_t ecc_result; + + page_sectors = flctl->page_size ? 4 : 1; + + set_cmd_regs(mtd, NAND_CMD_READ0, + (NAND_CMD_READSTART << 8) | NAND_CMD_READ0); + + writel(readl(FLCMNCR(flctl)) | ACM_SACCES_MODE | _4ECCCORRECT, + FLCMNCR(flctl)); + writel(readl(FLCMDCR(flctl)) | page_sectors, FLCMDCR(flctl)); + writel(page_addr << 2, FLADR(flctl)); + + empty_fifo(flctl); + start_translation(flctl); + + for (sector = 0; sector < page_sectors; sector++) { + read_fiforeg(flctl, 512, 512 * sector); + + ecc_result = read_ecfiforeg(flctl, + &flctl->done_buff[mtd->writesize + 16 * sector], + sector); + + switch (ecc_result) { + case FL_REPAIRABLE: + dev_info(&flctl->pdev->dev, + "applied ecc on page 0x%x", page_addr); + flctl->mtd.ecc_stats.corrected++; + break; + case FL_ERROR: + dev_warn(&flctl->pdev->dev, + "page 0x%x contains corrupted data\n", + page_addr); + flctl->mtd.ecc_stats.failed++; + break; + default: + ; + } + } + + wait_completion(flctl); + + writel(readl(FLCMNCR(flctl)) & ~(ACM_SACCES_MODE | _4ECCCORRECT), + FLCMNCR(flctl)); +} + +static void execmd_read_oob(struct mtd_info *mtd, int page_addr) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + int page_sectors = flctl->page_size ? 4 : 1; + int i; + + set_cmd_regs(mtd, NAND_CMD_READ0, + (NAND_CMD_READSTART << 8) | NAND_CMD_READ0); + + empty_fifo(flctl); + + for (i = 0; i < page_sectors; i++) { + set_addr(mtd, (512 + 16) * i + 512 , page_addr); + writel(16, FLDTCNTR(flctl)); + + start_translation(flctl); + read_fiforeg(flctl, 16, 16 * i); + wait_completion(flctl); + } +} + +static void execmd_write_page_sector(struct mtd_info *mtd) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + int page_addr = flctl->seqin_page_addr; + int sector, page_sectors; + + page_sectors = flctl->page_size ? 4 : 1; + + set_cmd_regs(mtd, NAND_CMD_PAGEPROG, + (NAND_CMD_PAGEPROG << 8) | NAND_CMD_SEQIN); + + empty_fifo(flctl); + writel(readl(FLCMNCR(flctl)) | ACM_SACCES_MODE, FLCMNCR(flctl)); + writel(readl(FLCMDCR(flctl)) | page_sectors, FLCMDCR(flctl)); + writel(page_addr << 2, FLADR(flctl)); + start_translation(flctl); + + for (sector = 0; sector < page_sectors; sector++) { + write_fiforeg(flctl, 512, 512 * sector); + write_ec_fiforeg(flctl, 16, mtd->writesize + 16 * sector); + } + + wait_completion(flctl); + writel(readl(FLCMNCR(flctl)) & ~ACM_SACCES_MODE, FLCMNCR(flctl)); +} + +static void execmd_write_oob(struct mtd_info *mtd) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + int page_addr = flctl->seqin_page_addr; + int sector, page_sectors; + + page_sectors = flctl->page_size ? 4 : 1; + + set_cmd_regs(mtd, NAND_CMD_PAGEPROG, + (NAND_CMD_PAGEPROG << 8) | NAND_CMD_SEQIN); + + for (sector = 0; sector < page_sectors; sector++) { + empty_fifo(flctl); + set_addr(mtd, sector * 528 + 512, page_addr); + writel(16, FLDTCNTR(flctl)); /* set read size */ + + start_translation(flctl); + write_fiforeg(flctl, 16, 16 * sector); + wait_completion(flctl); + } +} + +static void flctl_cmdfunc(struct mtd_info *mtd, unsigned int command, + int column, int page_addr) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + uint32_t read_cmd = 0; + + pm_runtime_get_sync(&flctl->pdev->dev); + + flctl->read_bytes = 0; + if (command != NAND_CMD_PAGEPROG) + flctl->index = 0; + + switch (command) { + case NAND_CMD_READ1: + case NAND_CMD_READ0: + if (flctl->hwecc) { + /* read page with hwecc */ + execmd_read_page_sector(mtd, page_addr); + break; + } + if (flctl->page_size) + set_cmd_regs(mtd, command, (NAND_CMD_READSTART << 8) + | command); + else + set_cmd_regs(mtd, command, command); + + set_addr(mtd, 0, page_addr); + + flctl->read_bytes = mtd->writesize + mtd->oobsize; + if (flctl->chip.options & NAND_BUSWIDTH_16) + column >>= 1; + flctl->index += column; + goto read_normal_exit; + + case NAND_CMD_READOOB: + if (flctl->hwecc) { + /* read page with hwecc */ + execmd_read_oob(mtd, page_addr); + break; + } + + if (flctl->page_size) { + set_cmd_regs(mtd, command, (NAND_CMD_READSTART << 8) + | NAND_CMD_READ0); + set_addr(mtd, mtd->writesize, page_addr); + } else { + set_cmd_regs(mtd, command, command); + set_addr(mtd, 0, page_addr); + } + flctl->read_bytes = mtd->oobsize; + goto read_normal_exit; + + case NAND_CMD_RNDOUT: + if (flctl->hwecc) + break; + + if (flctl->page_size) + set_cmd_regs(mtd, command, (NAND_CMD_RNDOUTSTART << 8) + | command); + else + set_cmd_regs(mtd, command, command); + + set_addr(mtd, column, 0); + + flctl->read_bytes = mtd->writesize + mtd->oobsize - column; + goto read_normal_exit; + + case NAND_CMD_READID: + set_cmd_regs(mtd, command, command); + + /* READID is always performed using an 8-bit bus */ + if (flctl->chip.options & NAND_BUSWIDTH_16) + column <<= 1; + set_addr(mtd, column, 0); + + flctl->read_bytes = 8; + writel(flctl->read_bytes, FLDTCNTR(flctl)); /* set read size */ + empty_fifo(flctl); + start_translation(flctl); + read_fiforeg(flctl, flctl->read_bytes, 0); + wait_completion(flctl); + break; + + case NAND_CMD_ERASE1: + flctl->erase1_page_addr = page_addr; + break; + + case NAND_CMD_ERASE2: + set_cmd_regs(mtd, NAND_CMD_ERASE1, + (command << 8) | NAND_CMD_ERASE1); + set_addr(mtd, -1, flctl->erase1_page_addr); + start_translation(flctl); + wait_completion(flctl); + break; + + case NAND_CMD_SEQIN: + if (!flctl->page_size) { + /* output read command */ + if (column >= mtd->writesize) { + column -= mtd->writesize; + read_cmd = NAND_CMD_READOOB; + } else if (column < 256) { + read_cmd = NAND_CMD_READ0; + } else { + column -= 256; + read_cmd = NAND_CMD_READ1; + } + } + flctl->seqin_column = column; + flctl->seqin_page_addr = page_addr; + flctl->seqin_read_cmd = read_cmd; + break; + + case NAND_CMD_PAGEPROG: + empty_fifo(flctl); + if (!flctl->page_size) { + set_cmd_regs(mtd, NAND_CMD_SEQIN, + flctl->seqin_read_cmd); + set_addr(mtd, -1, -1); + writel(0, FLDTCNTR(flctl)); /* set 0 size */ + start_translation(flctl); + wait_completion(flctl); + } + if (flctl->hwecc) { + /* write page with hwecc */ + if (flctl->seqin_column == mtd->writesize) + execmd_write_oob(mtd); + else if (!flctl->seqin_column) + execmd_write_page_sector(mtd); + else + printk(KERN_ERR "Invalid address !?\n"); + break; + } + set_cmd_regs(mtd, command, (command << 8) | NAND_CMD_SEQIN); + set_addr(mtd, flctl->seqin_column, flctl->seqin_page_addr); + writel(flctl->index, FLDTCNTR(flctl)); /* set write size */ + start_translation(flctl); + write_fiforeg(flctl, flctl->index, 0); + wait_completion(flctl); + break; + + case NAND_CMD_STATUS: + set_cmd_regs(mtd, command, command); + set_addr(mtd, -1, -1); + + flctl->read_bytes = 1; + writel(flctl->read_bytes, FLDTCNTR(flctl)); /* set read size */ + start_translation(flctl); + read_datareg(flctl, 0); /* read and end */ + break; + + case NAND_CMD_RESET: + set_cmd_regs(mtd, command, command); + set_addr(mtd, -1, -1); + + writel(0, FLDTCNTR(flctl)); /* set 0 size */ + start_translation(flctl); + wait_completion(flctl); + break; + + default: + break; + } + goto runtime_exit; + +read_normal_exit: + writel(flctl->read_bytes, FLDTCNTR(flctl)); /* set read size */ + empty_fifo(flctl); + start_translation(flctl); + read_fiforeg(flctl, flctl->read_bytes, 0); + wait_completion(flctl); +runtime_exit: + pm_runtime_put_sync(&flctl->pdev->dev); + return; +} + +static void flctl_select_chip(struct mtd_info *mtd, int chipnr) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + int ret; + + switch (chipnr) { + case -1: + flctl->flcmncr_base &= ~CE0_ENABLE; + + pm_runtime_get_sync(&flctl->pdev->dev); + writel(flctl->flcmncr_base, FLCMNCR(flctl)); + + if (flctl->qos_request) { + dev_pm_qos_remove_request(&flctl->pm_qos); + flctl->qos_request = 0; + } + + pm_runtime_put_sync(&flctl->pdev->dev); + break; + case 0: + flctl->flcmncr_base |= CE0_ENABLE; + + if (!flctl->qos_request) { + ret = dev_pm_qos_add_request(&flctl->pdev->dev, + &flctl->pm_qos, + DEV_PM_QOS_RESUME_LATENCY, + 100); + if (ret < 0) + dev_err(&flctl->pdev->dev, + "PM QoS request failed: %d\n", ret); + flctl->qos_request = 1; + } + + if (flctl->holden) { + pm_runtime_get_sync(&flctl->pdev->dev); + writel(HOLDEN, FLHOLDCR(flctl)); + pm_runtime_put_sync(&flctl->pdev->dev); + } + break; + default: + BUG(); + } +} + +static void flctl_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + + memcpy(&flctl->done_buff[flctl->index], buf, len); + flctl->index += len; +} + +static uint8_t flctl_read_byte(struct mtd_info *mtd) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + uint8_t data; + + data = flctl->done_buff[flctl->index]; + flctl->index++; + return data; +} + +static uint16_t flctl_read_word(struct mtd_info *mtd) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + uint16_t *buf = (uint16_t *)&flctl->done_buff[flctl->index]; + + flctl->index += 2; + return *buf; +} + +static void flctl_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + + memcpy(buf, &flctl->done_buff[flctl->index], len); + flctl->index += len; +} + +static int flctl_chip_init_tail(struct mtd_info *mtd) +{ + struct sh_flctl *flctl = mtd_to_flctl(mtd); + struct nand_chip *chip = &flctl->chip; + + if (mtd->writesize == 512) { + flctl->page_size = 0; + if (chip->chipsize > (32 << 20)) { + /* big than 32MB */ + flctl->rw_ADRCNT = ADRCNT_4; + flctl->erase_ADRCNT = ADRCNT_3; + } else if (chip->chipsize > (2 << 16)) { + /* big than 128KB */ + flctl->rw_ADRCNT = ADRCNT_3; + flctl->erase_ADRCNT = ADRCNT_2; + } else { + flctl->rw_ADRCNT = ADRCNT_2; + flctl->erase_ADRCNT = ADRCNT_1; + } + } else { + flctl->page_size = 1; + if (chip->chipsize > (128 << 20)) { + /* big than 128MB */ + flctl->rw_ADRCNT = ADRCNT2_E; + flctl->erase_ADRCNT = ADRCNT_3; + } else if (chip->chipsize > (8 << 16)) { + /* big than 512KB */ + flctl->rw_ADRCNT = ADRCNT_4; + flctl->erase_ADRCNT = ADRCNT_2; + } else { + flctl->rw_ADRCNT = ADRCNT_3; + flctl->erase_ADRCNT = ADRCNT_1; + } + } + + if (flctl->hwecc) { + if (mtd->writesize == 512) { + chip->ecc.layout = &flctl_4secc_oob_16; + chip->badblock_pattern = &flctl_4secc_smallpage; + } else { + chip->ecc.layout = &flctl_4secc_oob_64; + chip->badblock_pattern = &flctl_4secc_largepage; + } + + chip->ecc.size = 512; + chip->ecc.bytes = 10; + chip->ecc.strength = 4; + chip->ecc.read_page = flctl_read_page_hwecc; + chip->ecc.write_page = flctl_write_page_hwecc; + chip->ecc.mode = NAND_ECC_HW; + + /* 4 symbols ECC enabled */ + flctl->flcmncr_base |= _4ECCEN; + } else { + chip->ecc.mode = NAND_ECC_SOFT; + } + + return 0; +} + +static irqreturn_t flctl_handle_flste(int irq, void *dev_id) +{ + struct sh_flctl *flctl = dev_id; + + dev_err(&flctl->pdev->dev, "flste irq: %x\n", readl(FLINTDMACR(flctl))); + writel(flctl->flintdmacr_base, FLINTDMACR(flctl)); + + return IRQ_HANDLED; +} + +struct flctl_soc_config { + unsigned long flcmncr_val; + unsigned has_hwecc:1; + unsigned use_holden:1; +}; + +static struct flctl_soc_config flctl_sh7372_config = { + .flcmncr_val = CLK_16B_12L_4H | TYPESEL_SET | SHBUSSEL, + .has_hwecc = 1, + .use_holden = 1, +}; + +static const struct of_device_id of_flctl_match[] = { + { .compatible = "renesas,shmobile-flctl-sh7372", + .data = &flctl_sh7372_config }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_flctl_match); + +static struct sh_flctl_platform_data *flctl_parse_dt(struct device *dev) +{ + const struct of_device_id *match; + struct flctl_soc_config *config; + struct sh_flctl_platform_data *pdata; + struct device_node *dn = dev->of_node; + int ret; + + match = of_match_device(of_flctl_match, dev); + if (match) + config = (struct flctl_soc_config *)match->data; + else { + dev_err(dev, "%s: no OF configuration attached\n", __func__); + return NULL; + } + + pdata = devm_kzalloc(dev, sizeof(struct sh_flctl_platform_data), + GFP_KERNEL); + if (!pdata) + return NULL; + + /* set SoC specific options */ + pdata->flcmncr_val = config->flcmncr_val; + pdata->has_hwecc = config->has_hwecc; + pdata->use_holden = config->use_holden; + + /* parse user defined options */ + ret = of_get_nand_bus_width(dn); + if (ret == 16) + pdata->flcmncr_val |= SEL_16BIT; + else if (ret != 8) { + dev_err(dev, "%s: invalid bus width\n", __func__); + return NULL; + } + + return pdata; +} + +static int flctl_probe(struct platform_device *pdev) +{ + struct resource *res; + struct sh_flctl *flctl; + struct mtd_info *flctl_mtd; + struct nand_chip *nand; + struct sh_flctl_platform_data *pdata; + int ret; + int irq; + struct mtd_part_parser_data ppdata = {}; + + flctl = devm_kzalloc(&pdev->dev, sizeof(struct sh_flctl), GFP_KERNEL); + if (!flctl) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + flctl->reg = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(flctl->reg)) + return PTR_ERR(flctl->reg); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "failed to get flste irq data\n"); + return -ENXIO; + } + + ret = devm_request_irq(&pdev->dev, irq, flctl_handle_flste, IRQF_SHARED, + "flste", flctl); + if (ret) { + dev_err(&pdev->dev, "request interrupt failed.\n"); + return ret; + } + + if (pdev->dev.of_node) + pdata = flctl_parse_dt(&pdev->dev); + else + pdata = dev_get_platdata(&pdev->dev); + + if (!pdata) { + dev_err(&pdev->dev, "no setup data defined\n"); + return -EINVAL; + } + + platform_set_drvdata(pdev, flctl); + flctl_mtd = &flctl->mtd; + nand = &flctl->chip; + flctl_mtd->priv = nand; + flctl->pdev = pdev; + flctl->hwecc = pdata->has_hwecc; + flctl->holden = pdata->use_holden; + flctl->flcmncr_base = pdata->flcmncr_val; + flctl->flintdmacr_base = flctl->hwecc ? (STERINTE | ECERB) : STERINTE; + + /* Set address of hardware control function */ + /* 20 us command delay time */ + nand->chip_delay = 20; + + nand->read_byte = flctl_read_byte; + nand->write_buf = flctl_write_buf; + nand->read_buf = flctl_read_buf; + nand->select_chip = flctl_select_chip; + nand->cmdfunc = flctl_cmdfunc; + + if (pdata->flcmncr_val & SEL_16BIT) { + nand->options |= NAND_BUSWIDTH_16; + nand->read_word = flctl_read_word; + } + + pm_runtime_enable(&pdev->dev); + pm_runtime_resume(&pdev->dev); + + flctl_setup_dma(flctl); + + ret = nand_scan_ident(flctl_mtd, 1, NULL); + if (ret) + goto err_chip; + + ret = flctl_chip_init_tail(flctl_mtd); + if (ret) + goto err_chip; + + ret = nand_scan_tail(flctl_mtd); + if (ret) + goto err_chip; + + ppdata.of_node = pdev->dev.of_node; + ret = mtd_device_parse_register(flctl_mtd, NULL, &ppdata, pdata->parts, + pdata->nr_parts); + + return 0; + +err_chip: + flctl_release_dma(flctl); + pm_runtime_disable(&pdev->dev); + return ret; +} + +static int flctl_remove(struct platform_device *pdev) +{ + struct sh_flctl *flctl = platform_get_drvdata(pdev); + + flctl_release_dma(flctl); + nand_release(&flctl->mtd); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static struct platform_driver flctl_driver = { + .remove = flctl_remove, + .driver = { + .name = "sh_flctl", + .of_match_table = of_match_ptr(of_flctl_match), + }, +}; + +module_platform_driver_probe(flctl_driver, flctl_probe); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Yoshihiro Shimoda"); +MODULE_DESCRIPTION("SuperH FLCTL driver"); +MODULE_ALIAS("platform:sh_flctl"); |