* Afzal Mohammed <[email protected]> [120604 00:06]:
> +static int omap_prefetch_enable(int cs, int fifo_th, int dma_mode,
> + unsigned int u32_count, int is_write, struct omap_nand_info *info)
> +{
> + u32 val;
> +
> + if (fifo_th > PREFETCH_FIFOTHRESHOLD_MAX) {
> + pr_err("gpmc: fifo threshold is not supported\n");
> + return -1;
> + } else if (!(readl(info->reg.gpmc_prefetch_control))) {
> + /* Set the amount of bytes to be prefetched */
> + writel(u32_count, info->reg.gpmc_prefetch_config2);
> +
> + /* Set dma/mpu mode, the prefetch read / post write and
> + * enable the engine. Set which cs is has requested for.
> + */
> + val = ((cs << PREFETCH_CONFIG1_CS_SHIFT) |
> + PREFETCH_FIFOTHRESHOLD(fifo_th) |
> + ENABLE_PREFETCH |
> + (dma_mode << DMA_MPU_MODE_SHIFT) |
> + (0x1 & is_write));
> + writel(val, info->reg.gpmc_prefetch_config1);
> +
> + /* Start the prefetch engine */
> + writel(0x1, info->reg.gpmc_prefetch_control);
> + } else {
> + return -EBUSY;
> + }
> +
> + return 0;
> +}
You can simplify the above by leaving out the if else stuff by
returning early:
if (fifo_th > PREFETCH_FIFOTHRESHOLD_MAX)
return -1;
if (readl(info->reg.gpmc_prefetch_control))
return -EBUSY;
/* Set the amount of bytes to be prefetched */
writel(u32_count, info->reg.gpmc_prefetch_config2);
...
return 0;
Regards,
Tony
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