mtd: nand: omap2: Fix the nand-disk led trigger

When the omap2 nand flash driver is used, the nand-disk led trigger does not
work due to nand_wait_ready not being called.

This patch exports the trigger from nand_base.c, letting specific drivers
such omap2 control the led as appropriate.

Signed-off-by: Raphael Assenat <raph@8d.com>

On Thu, Sep 13, 2012 at 6:06 PM, Raphael Assenat <raph@8d.com> wrote:
> When the omap2 nand flash driver is used, the nand-disk led trigger does not
> work due to nand_wait_ready not being called.

I think better solution is just to delete omap_wait() function, which
is just a copy of nand_wait() without LED and oops handling. If
waitfunc is not set by the driver, default nand_wait is used by the
core.


> This patch exports the trigger from nand_base.c, letting specific drivers
> such omap2 control the led as appropriate.
>
> Signed-off-by: Raphael Assenat <raph@8d.com>
>
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index a11253a..b967c45 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c
> @@ -103,7 +103,7 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
>   * For devices which display every fart in the system on a separate LED. Is
>   * compiled away when LED support is disabled.
>   */
> -DEFINE_LED_TRIGGER(nand_led_trigger);
> +DEFINE_LED_TRIGGER_GLOBAL(nand_led_trigger);
>
>  static int check_offs_len(struct mtd_info *mtd,
>                                         loff_t ofs, uint64_t len)
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index ac4fd75..6aa683f 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -19,6 +19,7 @@
>  #include <linux/mtd/mtd.h>
>  #include <linux/mtd/nand.h>
>  #include <linux/mtd/partitions.h>
> +#include <linux/leds.h>
>  #include <linux/omap-dma.h>
>  #include <linux/io.h>
>  #include <linux/slab.h>
> @@ -254,6 +255,8 @@ static void omap_read_buf_pref(struct mtd_info *mtd, u_char *buf, int len)
>         int ret = 0;
>         u32 *p = (u32 *)buf;
>
> +       led_trigger_event(nand_led_trigger, LED_FULL);
> +
>         /* take care of subpage reads */
>         if (len % 4) {
>                 if (info->nand.options & NAND_BUSWIDTH_16)
> @@ -284,6 +287,8 @@ static void omap_read_buf_pref(struct mtd_info *mtd, u_char *buf, int len)
>                 /* disable and stop the PFPW engine */
>                 gpmc_prefetch_reset(info->gpmc_cs);
>         }
> +
> +       led_trigger_event(nand_led_trigger, LED_OFF);
>  }
>
>  /**
> @@ -302,6 +307,8 @@ static void omap_write_buf_pref(struct mtd_info *mtd,
>         u16 *p = (u16 *)buf;
>         unsigned long tim, limit;
>
> +       led_trigger_event(nand_led_trigger, LED_FULL);
> +
>         /* take care of subpage writes */
>         if (len % 2 != 0) {
>                 writeb(*buf, info->nand.IO_ADDR_W);
> @@ -335,6 +342,8 @@ static void omap_write_buf_pref(struct mtd_info *mtd,
>                 /* disable and stop the PFPW engine */
>                 gpmc_prefetch_reset(info->gpmc_cs);
>         }
> +
> +       led_trigger_event(nand_led_trigger, LED_OFF);
>  }
>
>  /*
> @@ -366,6 +375,8 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
>         unsigned n;
>         int ret;
>
> +       led_trigger_event(nand_led_trigger, LED_FULL);
> +
>         if (addr >= high_memory) {
>                 struct page *p1;
>
> @@ -417,6 +428,8 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
>         gpmc_prefetch_reset(info->gpmc_cs);
>
>         dma_unmap_sg(info->dma->device->dev, &sg, 1, dir);
> +
> +       led_trigger_event(nand_led_trigger, LED_OFF);
>         return 0;
>
>  out_copy_unmap:
> @@ -428,6 +441,9 @@ out_copy:
>         else
>                 is_write == 0 ? omap_read_buf8(mtd, (u_char *) addr, len)
>                         : omap_write_buf8(mtd, (u_char *) addr, len);
> +
> +       led_trigger_event(nand_led_trigger, LED_OFF);
> +
>         return 0;
>  }
>
> @@ -886,6 +902,8 @@ static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip)
>         else
>                 timeo += (HZ * 20) / 1000;
>
> +       led_trigger_event(nand_led_trigger, LED_FULL);
> +
>         gpmc_nand_write(info->gpmc_cs,
>                         GPMC_NAND_COMMAND, (NAND_CMD_STATUS & 0xFF));
>         while (time_before(jiffies, timeo)) {
> @@ -894,6 +912,7 @@ static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip)
>                         break;
>                 cond_resched();
>         }
> +       led_trigger_event(nand_led_trigger, LED_OFF);
>
>         status = gpmc_nand_read(info->gpmc_cs, GPMC_NAND_DATA);
>         return status;
> @@ -909,6 +928,8 @@ static int omap_dev_ready(struct mtd_info *mtd)
>         struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
>                                                         mtd);
>
> +       led_trigger_event(nand_led_trigger, LED_FULL);
> +
>         val = gpmc_read_status(GPMC_GET_IRQ_STATUS);
>         if ((val & 0x100) == 0x100) {
>                 /* Clear IRQ Interrupt */
> @@ -923,6 +944,8 @@ static int omap_dev_ready(struct mtd_info *mtd)
>                         val = gpmc_read_status(GPMC_GET_IRQ_STATUS);
>                 }
>         }
> +
> +       led_trigger_event(nand_led_trigger, LED_OFF);
>
>         return 1;
>  }
> diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> index 57977c6..321b7ef 100644
> --- a/include/linux/mtd/nand.h
> +++ b/include/linux/mtd/nand.h
> @@ -23,6 +23,7 @@
>  #include <linux/mtd/mtd.h>
>  #include <linux/mtd/flashchip.h>
>  #include <linux/mtd/bbm.h>
> +#include <linux/leds.h>
>
>  struct mtd_info;
>  struct nand_flash_dev;
> @@ -48,6 +49,9 @@ extern int nand_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
>  /* unlocks specified locked blocks */
>  extern int nand_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
>
> +/* LED trigger for NAND drivers not using nand_wait_ready. */
> +extern DEFINE_LED_TRIGGER_GLOBAL(nand_led_trigger);
> +
>  /* The maximum number of NAND chips in an array */
>  #define NAND_MAX_CHIPS         8
>
> --
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On Mon, 2012-09-17 at 13:52 +0300, Grazvydas Ignotas wrote:
> On Thu, Sep 13, 2012 at 6:06 PM, Raphael Assenat <raph@8d.com> wrote:
> > When the omap2 nand flash driver is used, the nand-disk led trigger does not
> > work due to nand_wait_ready not being called.
> 
> I think better solution is just to delete omap_wait() function, which
> is just a copy of nand_wait() without LED and oops handling. If
> waitfunc is not set by the driver, default nand_wait is used by the
> core.

Or if it does really need own wait function, we can re-work the internal
api similarly to what we did to MTD api. Instead of calling
'chip->waitfunc()' directly from everywhere, have a wrapper
'nand_wati()' function, which can do things common to all drivers, and
then actually call the underlying '->waitfunc()'. So in this case, it
can do the LED stuff.