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SubjectRe: [PATCH v4 11/35] mtd: rawnand: lpc32xx_mlc: convert driver to nand_scan()
On Fri, 20 Jul 2018 17:15:03 +0200
Miquel Raynal <miquel.raynal@bootlin.com> wrote:

> Two helpers have been added to the core to make ECC-related
> configuration between the detection phase and the final NAND scan. Use
> these hooks and convert the driver to just use nand_scan() instead of
> both nand_scan_ident() and nand_scan_tail().
>
> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> ---
> drivers/mtd/nand/raw/lpc32xx_mlc.c | 109 ++++++++++++++++++++-----------------
> 1 file changed, 59 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/lpc32xx_mlc.c b/drivers/mtd/nand/raw/lpc32xx_mlc.c
> index 052d123a8304..6f73136fa863 100644
> --- a/drivers/mtd/nand/raw/lpc32xx_mlc.c
> +++ b/drivers/mtd/nand/raw/lpc32xx_mlc.c
> @@ -184,6 +184,7 @@ static struct nand_bbt_descr lpc32xx_nand_bbt_mirror = {
> };
>
> struct lpc32xx_nand_host {
> + struct platform_device *pdev;
> struct nand_chip nand_chip;
> struct lpc32xx_mlc_platform_data *pdata;
> struct clk *clk;
> @@ -653,6 +654,58 @@ static struct lpc32xx_nand_cfg_mlc *lpc32xx_parse_dt(struct device *dev)
> return ncfg;
> }
>
> +static int lpc32xx_nand_attach_chip(struct nand_chip *chip)
> +{
> + struct mtd_info *mtd = nand_to_mtd(chip);
> + struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
> + struct device *dev = &host->pdev->dev;
> +
> + host->dma_buf = devm_kzalloc(dev, mtd->writesize, GFP_KERNEL);
> + if (!host->dma_buf)
> + return -ENOMEM;
> +
> + host->dummy_buf = devm_kzalloc(dev, mtd->writesize, GFP_KERNEL);
> + if (!host->dummy_buf)
> + return -ENOMEM;
> +
> + chip->ecc.mode = NAND_ECC_HW;
> + chip->ecc.size = 512;
> + mtd_set_ooblayout(mtd, &lpc32xx_ooblayout_ops);
> + 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(host->pdev, 0);
> + if (host->irq < 0) {
> + dev_err(dev, "failed to get platform irq\n");
> + return -EINVAL;
> + }
> +
> + if (request_irq(host->irq, (irq_handler_t)&lpc3xxx_nand_irq,
> + IRQF_TRIGGER_HIGH, DRV_NAME, host)) {
> + dev_err(dev, "Error requesting NAND IRQ\n");
> + return -ENXIO;
> + }
> +
> + return 0;
> +}
> +
> +static void lpc32xx_nand_detach_chip(struct nand_chip *chip)
> +{
> + struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
> +
> + free_irq(host->irq, host);

Now you call 2 times free_irq() in the ->remove() path.

> +}
> +
> +static const struct nand_controller_ops lpc32xx_nand_controller_ops = {
> + .attach_chip = lpc32xx_nand_attach_chip,
> + .detach_chip = lpc32xx_nand_detach_chip,
> +};
> +
> /*
> * Probe for NAND controller
> */
> @@ -669,6 +722,8 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
> if (!host)
> return -ENOMEM;
>
> + host->pdev = pdev;
> +
> rc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> host->io_base = devm_ioremap_resource(&pdev->dev, rc);
> if (IS_ERR(host->io_base))
> @@ -749,58 +804,14 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
> }
>
> /*
> - * Scan to find existance of the device and
> - * Get the type of NAND device SMALL block or LARGE block
> + * Scan to find existence of the device and get the type of NAND device:
> + * SMALL block or LARGE block.
> */
> - res = nand_scan_ident(mtd, 1, NULL);
> + nand_chip->dummy_controller.ops = &lpc32xx_nand_controller_ops;
> + res = nand_scan(mtd, 1);
> if (res)
> goto release_dma_chan;
>
> - host->dma_buf = devm_kzalloc(&pdev->dev, mtd->writesize, GFP_KERNEL);
> - if (!host->dma_buf) {
> - res = -ENOMEM;
> - goto release_dma_chan;
> - }
> -
> - host->dummy_buf = devm_kzalloc(&pdev->dev, mtd->writesize, GFP_KERNEL);
> - if (!host->dummy_buf) {
> - res = -ENOMEM;
> - goto release_dma_chan;
> - }
> -
> - nand_chip->ecc.mode = NAND_ECC_HW;
> - nand_chip->ecc.size = 512;
> - mtd_set_ooblayout(mtd, &lpc32xx_ooblayout_ops);
> - host->mlcsubpages = mtd->writesize / 512;
> -

Starting here...

> - /* 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) {
> - dev_err(&pdev->dev, "failed to get platform irq\n");
> - res = -EINVAL;
> - goto release_dma_chan;
> - }
> -
> - 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 release_dma_chan;
> - }

till there: maybe we should just move this block before nand_scan().
Registering an IRQ handler is not really something you should do in
->attach_chip() IMO.

> -
> - /*
> - * Fills out all the uninitialized function pointers with the defaults
> - * And scans for a bad block table if appropriate.
> - */
> - res = nand_scan_tail(mtd);
> - if (res)
> - goto free_irq;
> -
> mtd->name = DRV_NAME;
>
> res = mtd_device_register(mtd, host->ncfg->parts,
> @@ -812,8 +823,6 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
>
> cleanup_nand:
> nand_cleanup(nand_chip);
> -free_irq:
> - free_irq(host->irq, host);
> release_dma_chan:
> if (use_dma)
> dma_release_channel(host->dma_chan);

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