> +#ifdef CONFIG_ARCH_OMAP3
> +unsigned long (*_omap3_sram_delay)(unsigned long);
> +unsigned int measure_sram_delay(unsigned int loop)
> +{
> + static struct omap_dm_timer *gpt;
> + unsigned long flags, diff = 0, gt_rate, mpurate;
> + unsigned int delay_sram, error_gain;
> +
> + omap_dm_timer_init();
> + gpt = omap_dm_timer_request_specific(10);
> + if (!gpt)
> + pr_err("Could not get the gptimer\n");
> + omap_dm_timer_set_source(gpt, OMAP_TIMER_SRC_SYS_CLK);
> +
> + gt_rate = clk_get_rate(omap_dm_timer_get_fclk(gpt));
> + omap_dm_timer_set_load_start(gpt, 0, 0);
> +
> + local_irq_save(flags);
> + diff = _omap3_sram_delay(loop);
> + local_irq_restore(flags);
> +
> + omap_dm_timer_stop(gpt);
> + omap_dm_timer_free(gpt);
> +
> + mpurate = clk_get_rate(clk_get(NULL, "arm_fck"));
> +
> + /* calculate the sram delay */
> + delay_sram = ((((mpurate/1000000) / (gt_rate/1000000)) * diff) / 20000);
Can remove the 1000000 from the denominators as they cancel out.
> +
> + error_gain = ((mpurate/1000000) / (gt_rate/1000000));
Same as before.
> + delay_sram = delay_sram + error_gain;
> +
> + return delay_sram;
> +}
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