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path: root/drivers/mtd/nand/raw/omap2.c
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Diffstat (limited to 'drivers/mtd/nand/raw/omap2.c')
-rw-r--r--drivers/mtd/nand/raw/omap2.c463
1 files changed, 230 insertions, 233 deletions
diff --git a/drivers/mtd/nand/raw/omap2.c b/drivers/mtd/nand/raw/omap2.c
index e50c64adc3c8..4546ac0bed4a 100644
--- a/drivers/mtd/nand/raw/omap2.c
+++ b/drivers/mtd/nand/raw/omap2.c
@@ -144,12 +144,6 @@ static u_char bch8_vector[] = {0xf3, 0xdb, 0x14, 0x16, 0x8b, 0xd2, 0xbe, 0xcc,
0xac, 0x6b, 0xff, 0x99, 0x7b};
static u_char bch4_vector[] = {0x00, 0x6b, 0x31, 0xdd, 0x41, 0xbc, 0x10};
-/* Shared among all NAND instances to synchronize access to the ECC Engine */
-static struct nand_hw_control omap_gpmc_controller = {
- .lock = __SPIN_LOCK_UNLOCKED(omap_gpmc_controller.lock),
- .wq = __WAIT_QUEUE_HEAD_INITIALIZER(omap_gpmc_controller.wq),
-};
-
struct omap_nand_info {
struct nand_chip nand;
struct platform_device *pdev;
@@ -1915,106 +1909,26 @@ static const struct mtd_ooblayout_ops omap_sw_ooblayout_ops = {
.free = omap_sw_ooblayout_free,
};
-static int omap_nand_probe(struct platform_device *pdev)
+static int omap_nand_attach_chip(struct nand_chip *chip)
{
- struct omap_nand_info *info;
- struct mtd_info *mtd;
- struct nand_chip *nand_chip;
- int err;
- dma_cap_mask_t mask;
- struct resource *res;
- struct device *dev = &pdev->dev;
- int min_oobbytes = BADBLOCK_MARKER_LENGTH;
- int oobbytes_per_step;
-
- info = devm_kzalloc(&pdev->dev, sizeof(struct omap_nand_info),
- GFP_KERNEL);
- if (!info)
- return -ENOMEM;
-
- info->pdev = pdev;
-
- err = omap_get_dt_info(dev, info);
- if (err)
- return err;
-
- info->ops = gpmc_omap_get_nand_ops(&info->reg, info->gpmc_cs);
- if (!info->ops) {
- dev_err(&pdev->dev, "Failed to get GPMC->NAND interface\n");
- return -ENODEV;
- }
-
- nand_chip = &info->nand;
- mtd = nand_to_mtd(nand_chip);
- mtd->dev.parent = &pdev->dev;
- nand_chip->ecc.priv = NULL;
- nand_set_flash_node(nand_chip, dev->of_node);
-
- if (!mtd->name) {
- mtd->name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
- "omap2-nand.%d", info->gpmc_cs);
- if (!mtd->name) {
- dev_err(&pdev->dev, "Failed to set MTD name\n");
- return -ENOMEM;
- }
- }
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- nand_chip->IO_ADDR_R = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(nand_chip->IO_ADDR_R))
- return PTR_ERR(nand_chip->IO_ADDR_R);
-
- info->phys_base = res->start;
-
- nand_chip->controller = &omap_gpmc_controller;
-
- nand_chip->IO_ADDR_W = nand_chip->IO_ADDR_R;
- nand_chip->cmd_ctrl = omap_hwcontrol;
-
- info->ready_gpiod = devm_gpiod_get_optional(&pdev->dev, "rb",
- GPIOD_IN);
- if (IS_ERR(info->ready_gpiod)) {
- dev_err(dev, "failed to get ready gpio\n");
- return PTR_ERR(info->ready_gpiod);
- }
-
- /*
- * If RDY/BSY line is connected to OMAP then use the omap ready
- * function and the generic nand_wait function which reads the status
- * register after monitoring the RDY/BSY line. Otherwise use a standard
- * chip delay which is slightly more than tR (AC Timing) of the NAND
- * device and read status register until you get a failure or success
- */
- if (info->ready_gpiod) {
- nand_chip->dev_ready = omap_dev_ready;
- nand_chip->chip_delay = 0;
- } else {
- nand_chip->waitfunc = omap_wait;
- nand_chip->chip_delay = 50;
- }
-
- if (info->flash_bbt)
- nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
-
- /* scan NAND device connected to chip controller */
- nand_chip->options |= info->devsize & NAND_BUSWIDTH_16;
- err = nand_scan_ident(mtd, 1, NULL);
- if (err) {
- dev_err(&info->pdev->dev,
- "scan failed, may be bus-width mismatch\n");
- goto return_error;
- }
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ struct omap_nand_info *info = mtd_to_omap(mtd);
+ struct device *dev = &info->pdev->dev;
+ int min_oobbytes = BADBLOCK_MARKER_LENGTH;
+ int oobbytes_per_step;
+ dma_cap_mask_t mask;
+ int err;
- if (nand_chip->bbt_options & NAND_BBT_USE_FLASH)
- nand_chip->bbt_options |= NAND_BBT_NO_OOB;
+ if (chip->bbt_options & NAND_BBT_USE_FLASH)
+ chip->bbt_options |= NAND_BBT_NO_OOB;
else
- nand_chip->options |= NAND_SKIP_BBTSCAN;
+ chip->options |= NAND_SKIP_BBTSCAN;
- /* re-populate low-level callbacks based on xfer modes */
+ /* Re-populate low-level callbacks based on xfer modes */
switch (info->xfer_type) {
case NAND_OMAP_PREFETCH_POLLED:
- nand_chip->read_buf = omap_read_buf_pref;
- nand_chip->write_buf = omap_write_buf_pref;
+ chip->read_buf = omap_read_buf_pref;
+ chip->write_buf = omap_write_buf_pref;
break;
case NAND_OMAP_POLLED:
@@ -2024,12 +1938,11 @@ static int omap_nand_probe(struct platform_device *pdev)
case NAND_OMAP_PREFETCH_DMA:
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
- info->dma = dma_request_chan(pdev->dev.parent, "rxtx");
+ info->dma = dma_request_chan(dev, "rxtx");
if (IS_ERR(info->dma)) {
- dev_err(&pdev->dev, "DMA engine request failed\n");
- err = PTR_ERR(info->dma);
- goto return_error;
+ dev_err(dev, "DMA engine request failed\n");
+ return PTR_ERR(info->dma);
} else {
struct dma_slave_config cfg;
@@ -2042,222 +1955,306 @@ static int omap_nand_probe(struct platform_device *pdev)
cfg.dst_maxburst = 16;
err = dmaengine_slave_config(info->dma, &cfg);
if (err) {
- dev_err(&pdev->dev, "DMA engine slave config failed: %d\n",
+ dev_err(dev,
+ "DMA engine slave config failed: %d\n",
err);
- goto return_error;
+ return err;
}
- nand_chip->read_buf = omap_read_buf_dma_pref;
- nand_chip->write_buf = omap_write_buf_dma_pref;
+ chip->read_buf = omap_read_buf_dma_pref;
+ chip->write_buf = omap_write_buf_dma_pref;
}
break;
case NAND_OMAP_PREFETCH_IRQ:
- info->gpmc_irq_fifo = platform_get_irq(pdev, 0);
+ info->gpmc_irq_fifo = platform_get_irq(info->pdev, 0);
if (info->gpmc_irq_fifo <= 0) {
- dev_err(&pdev->dev, "error getting fifo irq\n");
- err = -ENODEV;
- goto return_error;
+ dev_err(dev, "Error getting fifo IRQ\n");
+ return -ENODEV;
}
- err = devm_request_irq(&pdev->dev, info->gpmc_irq_fifo,
- omap_nand_irq, IRQF_SHARED,
- "gpmc-nand-fifo", info);
+ err = devm_request_irq(dev, info->gpmc_irq_fifo,
+ omap_nand_irq, IRQF_SHARED,
+ "gpmc-nand-fifo", info);
if (err) {
- dev_err(&pdev->dev, "requesting irq(%d) error:%d",
- info->gpmc_irq_fifo, err);
+ dev_err(dev, "Requesting IRQ %d, error %d\n",
+ info->gpmc_irq_fifo, err);
info->gpmc_irq_fifo = 0;
- goto return_error;
+ return err;
}
- info->gpmc_irq_count = platform_get_irq(pdev, 1);
+ info->gpmc_irq_count = platform_get_irq(info->pdev, 1);
if (info->gpmc_irq_count <= 0) {
- dev_err(&pdev->dev, "error getting count irq\n");
- err = -ENODEV;
- goto return_error;
+ dev_err(dev, "Error getting IRQ count\n");
+ return -ENODEV;
}
- err = devm_request_irq(&pdev->dev, info->gpmc_irq_count,
- omap_nand_irq, IRQF_SHARED,
- "gpmc-nand-count", info);
+ err = devm_request_irq(dev, info->gpmc_irq_count,
+ omap_nand_irq, IRQF_SHARED,
+ "gpmc-nand-count", info);
if (err) {
- dev_err(&pdev->dev, "requesting irq(%d) error:%d",
- info->gpmc_irq_count, err);
+ dev_err(dev, "Requesting IRQ %d, error %d\n",
+ info->gpmc_irq_count, err);
info->gpmc_irq_count = 0;
- goto return_error;
+ return err;
}
- nand_chip->read_buf = omap_read_buf_irq_pref;
- nand_chip->write_buf = omap_write_buf_irq_pref;
+ chip->read_buf = omap_read_buf_irq_pref;
+ chip->write_buf = omap_write_buf_irq_pref;
break;
default:
- dev_err(&pdev->dev,
- "xfer_type(%d) not supported!\n", info->xfer_type);
- err = -EINVAL;
- goto return_error;
+ dev_err(dev, "xfer_type %d not supported!\n", info->xfer_type);
+ return -EINVAL;
}
- if (!omap2_nand_ecc_check(info)) {
- err = -EINVAL;
- goto return_error;
- }
+ if (!omap2_nand_ecc_check(info))
+ return -EINVAL;
/*
* Bail out earlier to let NAND_ECC_SOFT code create its own
* ooblayout instead of using ours.
*/
if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) {
- nand_chip->ecc.mode = NAND_ECC_SOFT;
- nand_chip->ecc.algo = NAND_ECC_HAMMING;
- goto scan_tail;
+ chip->ecc.mode = NAND_ECC_SOFT;
+ chip->ecc.algo = NAND_ECC_HAMMING;
+ return 0;
}
- /* populate MTD interface based on ECC scheme */
+ /* Populate MTD interface based on ECC scheme */
switch (info->ecc_opt) {
case OMAP_ECC_HAM1_CODE_HW:
- pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n");
- nand_chip->ecc.mode = NAND_ECC_HW;
- nand_chip->ecc.bytes = 3;
- nand_chip->ecc.size = 512;
- nand_chip->ecc.strength = 1;
- nand_chip->ecc.calculate = omap_calculate_ecc;
- nand_chip->ecc.hwctl = omap_enable_hwecc;
- nand_chip->ecc.correct = omap_correct_data;
+ dev_info(dev, "nand: using OMAP_ECC_HAM1_CODE_HW\n");
+ chip->ecc.mode = NAND_ECC_HW;
+ chip->ecc.bytes = 3;
+ chip->ecc.size = 512;
+ chip->ecc.strength = 1;
+ chip->ecc.calculate = omap_calculate_ecc;
+ chip->ecc.hwctl = omap_enable_hwecc;
+ chip->ecc.correct = omap_correct_data;
mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
- oobbytes_per_step = nand_chip->ecc.bytes;
+ oobbytes_per_step = chip->ecc.bytes;
- if (!(nand_chip->options & NAND_BUSWIDTH_16))
- min_oobbytes = 1;
+ if (!(chip->options & NAND_BUSWIDTH_16))
+ min_oobbytes = 1;
break;
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
pr_info("nand: using OMAP_ECC_BCH4_CODE_HW_DETECTION_SW\n");
- nand_chip->ecc.mode = NAND_ECC_HW;
- nand_chip->ecc.size = 512;
- nand_chip->ecc.bytes = 7;
- nand_chip->ecc.strength = 4;
- nand_chip->ecc.hwctl = omap_enable_hwecc_bch;
- nand_chip->ecc.correct = nand_bch_correct_data;
- nand_chip->ecc.calculate = omap_calculate_ecc_bch_sw;
+ chip->ecc.mode = NAND_ECC_HW;
+ chip->ecc.size = 512;
+ chip->ecc.bytes = 7;
+ chip->ecc.strength = 4;
+ chip->ecc.hwctl = omap_enable_hwecc_bch;
+ chip->ecc.correct = nand_bch_correct_data;
+ chip->ecc.calculate = omap_calculate_ecc_bch_sw;
mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
/* Reserve one byte for the OMAP marker */
- oobbytes_per_step = nand_chip->ecc.bytes + 1;
- /* software bch library is used for locating errors */
- nand_chip->ecc.priv = nand_bch_init(mtd);
- if (!nand_chip->ecc.priv) {
- dev_err(&info->pdev->dev, "unable to use BCH library\n");
- err = -EINVAL;
- goto return_error;
+ oobbytes_per_step = chip->ecc.bytes + 1;
+ /* Software BCH library is used for locating errors */
+ chip->ecc.priv = nand_bch_init(mtd);
+ if (!chip->ecc.priv) {
+ dev_err(dev, "Unable to use BCH library\n");
+ return -EINVAL;
}
break;
case OMAP_ECC_BCH4_CODE_HW:
pr_info("nand: using OMAP_ECC_BCH4_CODE_HW ECC scheme\n");
- nand_chip->ecc.mode = NAND_ECC_HW;
- nand_chip->ecc.size = 512;
+ chip->ecc.mode = NAND_ECC_HW;
+ chip->ecc.size = 512;
/* 14th bit is kept reserved for ROM-code compatibility */
- nand_chip->ecc.bytes = 7 + 1;
- nand_chip->ecc.strength = 4;
- nand_chip->ecc.hwctl = omap_enable_hwecc_bch;
- nand_chip->ecc.correct = omap_elm_correct_data;
- nand_chip->ecc.read_page = omap_read_page_bch;
- nand_chip->ecc.write_page = omap_write_page_bch;
- nand_chip->ecc.write_subpage = omap_write_subpage_bch;
+ chip->ecc.bytes = 7 + 1;
+ chip->ecc.strength = 4;
+ chip->ecc.hwctl = omap_enable_hwecc_bch;
+ chip->ecc.correct = omap_elm_correct_data;
+ chip->ecc.read_page = omap_read_page_bch;
+ chip->ecc.write_page = omap_write_page_bch;
+ chip->ecc.write_subpage = omap_write_subpage_bch;
mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
- oobbytes_per_step = nand_chip->ecc.bytes;
+ oobbytes_per_step = chip->ecc.bytes;
err = elm_config(info->elm_dev, BCH4_ECC,
- mtd->writesize / nand_chip->ecc.size,
- nand_chip->ecc.size, nand_chip->ecc.bytes);
+ mtd->writesize / chip->ecc.size,
+ chip->ecc.size, chip->ecc.bytes);
if (err < 0)
- goto return_error;
+ return err;
break;
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
pr_info("nand: using OMAP_ECC_BCH8_CODE_HW_DETECTION_SW\n");
- nand_chip->ecc.mode = NAND_ECC_HW;
- nand_chip->ecc.size = 512;
- nand_chip->ecc.bytes = 13;
- nand_chip->ecc.strength = 8;
- nand_chip->ecc.hwctl = omap_enable_hwecc_bch;
- nand_chip->ecc.correct = nand_bch_correct_data;
- nand_chip->ecc.calculate = omap_calculate_ecc_bch_sw;
+ chip->ecc.mode = NAND_ECC_HW;
+ chip->ecc.size = 512;
+ chip->ecc.bytes = 13;
+ chip->ecc.strength = 8;
+ chip->ecc.hwctl = omap_enable_hwecc_bch;
+ chip->ecc.correct = nand_bch_correct_data;
+ chip->ecc.calculate = omap_calculate_ecc_bch_sw;
mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
/* Reserve one byte for the OMAP marker */
- oobbytes_per_step = nand_chip->ecc.bytes + 1;
- /* software bch library is used for locating errors */
- nand_chip->ecc.priv = nand_bch_init(mtd);
- if (!nand_chip->ecc.priv) {
- dev_err(&info->pdev->dev, "unable to use BCH library\n");
- err = -EINVAL;
- goto return_error;
+ oobbytes_per_step = chip->ecc.bytes + 1;
+ /* Software BCH library is used for locating errors */
+ chip->ecc.priv = nand_bch_init(mtd);
+ if (!chip->ecc.priv) {
+ dev_err(dev, "unable to use BCH library\n");
+ return -EINVAL;
}
break;
case OMAP_ECC_BCH8_CODE_HW:
pr_info("nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme\n");
- nand_chip->ecc.mode = NAND_ECC_HW;
- nand_chip->ecc.size = 512;
+ chip->ecc.mode = NAND_ECC_HW;
+ chip->ecc.size = 512;
/* 14th bit is kept reserved for ROM-code compatibility */
- nand_chip->ecc.bytes = 13 + 1;
- nand_chip->ecc.strength = 8;
- nand_chip->ecc.hwctl = omap_enable_hwecc_bch;
- nand_chip->ecc.correct = omap_elm_correct_data;
- nand_chip->ecc.read_page = omap_read_page_bch;
- nand_chip->ecc.write_page = omap_write_page_bch;
- nand_chip->ecc.write_subpage = omap_write_subpage_bch;
+ chip->ecc.bytes = 13 + 1;
+ chip->ecc.strength = 8;
+ chip->ecc.hwctl = omap_enable_hwecc_bch;
+ chip->ecc.correct = omap_elm_correct_data;
+ chip->ecc.read_page = omap_read_page_bch;
+ chip->ecc.write_page = omap_write_page_bch;
+ chip->ecc.write_subpage = omap_write_subpage_bch;
mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
- oobbytes_per_step = nand_chip->ecc.bytes;
+ oobbytes_per_step = chip->ecc.bytes;
err = elm_config(info->elm_dev, BCH8_ECC,
- mtd->writesize / nand_chip->ecc.size,
- nand_chip->ecc.size, nand_chip->ecc.bytes);
+ mtd->writesize / chip->ecc.size,
+ chip->ecc.size, chip->ecc.bytes);
if (err < 0)
- goto return_error;
+ return err;
break;
case OMAP_ECC_BCH16_CODE_HW:
- pr_info("using OMAP_ECC_BCH16_CODE_HW ECC scheme\n");
- nand_chip->ecc.mode = NAND_ECC_HW;
- nand_chip->ecc.size = 512;
- nand_chip->ecc.bytes = 26;
- nand_chip->ecc.strength = 16;
- nand_chip->ecc.hwctl = omap_enable_hwecc_bch;
- nand_chip->ecc.correct = omap_elm_correct_data;
- nand_chip->ecc.read_page = omap_read_page_bch;
- nand_chip->ecc.write_page = omap_write_page_bch;
- nand_chip->ecc.write_subpage = omap_write_subpage_bch;
+ pr_info("Using OMAP_ECC_BCH16_CODE_HW ECC scheme\n");
+ chip->ecc.mode = NAND_ECC_HW;
+ chip->ecc.size = 512;
+ chip->ecc.bytes = 26;
+ chip->ecc.strength = 16;
+ chip->ecc.hwctl = omap_enable_hwecc_bch;
+ chip->ecc.correct = omap_elm_correct_data;
+ chip->ecc.read_page = omap_read_page_bch;
+ chip->ecc.write_page = omap_write_page_bch;
+ chip->ecc.write_subpage = omap_write_subpage_bch;
mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
- oobbytes_per_step = nand_chip->ecc.bytes;
+ oobbytes_per_step = chip->ecc.bytes;
err = elm_config(info->elm_dev, BCH16_ECC,
- mtd->writesize / nand_chip->ecc.size,
- nand_chip->ecc.size, nand_chip->ecc.bytes);
+ mtd->writesize / chip->ecc.size,
+ chip->ecc.size, chip->ecc.bytes);
if (err < 0)
- goto return_error;
+ return err;
break;
default:
- dev_err(&info->pdev->dev, "invalid or unsupported ECC scheme\n");
- err = -EINVAL;
- goto return_error;
+ dev_err(dev, "Invalid or unsupported ECC scheme\n");
+ return -EINVAL;
}
- /* check if NAND device's OOB is enough to store ECC signatures */
+ /* Check if NAND device's OOB is enough to store ECC signatures */
min_oobbytes += (oobbytes_per_step *
- (mtd->writesize / nand_chip->ecc.size));
+ (mtd->writesize / chip->ecc.size));
if (mtd->oobsize < min_oobbytes) {
- dev_err(&info->pdev->dev,
- "not enough OOB bytes required = %d, available=%d\n",
+ dev_err(dev,
+ "Not enough OOB bytes: required = %d, available=%d\n",
min_oobbytes, mtd->oobsize);
- err = -EINVAL;
- goto return_error;
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct nand_controller_ops omap_nand_controller_ops = {
+ .attach_chip = omap_nand_attach_chip,
+};
+
+/* Shared among all NAND instances to synchronize access to the ECC Engine */
+static struct nand_controller omap_gpmc_controller = {
+ .lock = __SPIN_LOCK_UNLOCKED(omap_gpmc_controller.lock),
+ .wq = __WAIT_QUEUE_HEAD_INITIALIZER(omap_gpmc_controller.wq),
+ .ops = &omap_nand_controller_ops,
+};
+
+static int omap_nand_probe(struct platform_device *pdev)
+{
+ struct omap_nand_info *info;
+ struct mtd_info *mtd;
+ struct nand_chip *nand_chip;
+ int err;
+ struct resource *res;
+ struct device *dev = &pdev->dev;
+
+ info = devm_kzalloc(&pdev->dev, sizeof(struct omap_nand_info),
+ GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->pdev = pdev;
+
+ err = omap_get_dt_info(dev, info);
+ if (err)
+ return err;
+
+ info->ops = gpmc_omap_get_nand_ops(&info->reg, info->gpmc_cs);
+ if (!info->ops) {
+ dev_err(&pdev->dev, "Failed to get GPMC->NAND interface\n");
+ return -ENODEV;
}
-scan_tail:
- /* second phase scan */
- err = nand_scan_tail(mtd);
+ nand_chip = &info->nand;
+ mtd = nand_to_mtd(nand_chip);
+ mtd->dev.parent = &pdev->dev;
+ nand_chip->ecc.priv = NULL;
+ nand_set_flash_node(nand_chip, dev->of_node);
+
+ if (!mtd->name) {
+ mtd->name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+ "omap2-nand.%d", info->gpmc_cs);
+ if (!mtd->name) {
+ dev_err(&pdev->dev, "Failed to set MTD name\n");
+ return -ENOMEM;
+ }
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ nand_chip->IO_ADDR_R = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(nand_chip->IO_ADDR_R))
+ return PTR_ERR(nand_chip->IO_ADDR_R);
+
+ info->phys_base = res->start;
+
+ nand_chip->controller = &omap_gpmc_controller;
+
+ nand_chip->IO_ADDR_W = nand_chip->IO_ADDR_R;
+ nand_chip->cmd_ctrl = omap_hwcontrol;
+
+ info->ready_gpiod = devm_gpiod_get_optional(&pdev->dev, "rb",
+ GPIOD_IN);
+ if (IS_ERR(info->ready_gpiod)) {
+ dev_err(dev, "failed to get ready gpio\n");
+ return PTR_ERR(info->ready_gpiod);
+ }
+
+ /*
+ * If RDY/BSY line is connected to OMAP then use the omap ready
+ * function and the generic nand_wait function which reads the status
+ * register after monitoring the RDY/BSY line. Otherwise use a standard
+ * chip delay which is slightly more than tR (AC Timing) of the NAND
+ * device and read status register until you get a failure or success
+ */
+ if (info->ready_gpiod) {
+ nand_chip->dev_ready = omap_dev_ready;
+ nand_chip->chip_delay = 0;
+ } else {
+ nand_chip->waitfunc = omap_wait;
+ nand_chip->chip_delay = 50;
+ }
+
+ if (info->flash_bbt)
+ nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
+
+ /* scan NAND device connected to chip controller */
+ nand_chip->options |= info->devsize & NAND_BUSWIDTH_16;
+
+ err = nand_scan(mtd, 1);
if (err)
goto return_error;
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-25 20:31:55 +0000