memory: tegra: Adapt for Tegra20 clock driver changes

Now Tegra20 and Tegra30 EMC drivers should provide clock-rounding
functionality using the new Tegra clock driver API.

Acked-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c
index da8fa59..b519f02 100644 (file)
--- a/drivers/memory/tegra/tegra20-emc.c
+++ b/drivers/memory/tegra/tegra20-emc.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/clk/tegra.h>
 #include <linux/completion.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>
@@ -421,6 +422,44 @@ static int emc_setup_hw(struct tegra_emc *emc)
        return 0;
 }
 
+static long emc_round_rate(unsigned long rate,
+                          unsigned long min_rate,
+                          unsigned long max_rate,
+                          void *arg)
+{
+       struct emc_timing *timing = NULL;
+       struct tegra_emc *emc = arg;
+       unsigned int i;
+
+       min_rate = min(min_rate, emc->timings[emc->num_timings - 1].rate);
+
+       for (i = 0; i < emc->num_timings; i++) {
+               if (emc->timings[i].rate < rate && i != emc->num_timings - 1)
+                       continue;
+
+               if (emc->timings[i].rate > max_rate) {
+                       i = max(i, 1u) - 1;
+
+                       if (emc->timings[i].rate < min_rate)
+                               break;
+               }
+
+               if (emc->timings[i].rate < min_rate)
+                       continue;
+
+               timing = &emc->timings[i];
+               break;
+       }
+
+       if (!timing) {
+               dev_err(emc->dev, "no timing for rate %lu min %lu max %lu\n",
+                       rate, min_rate, max_rate);
+               return -EINVAL;
+       }
+
+       return timing->rate;
+}
+
 static int tegra_emc_probe(struct platform_device *pdev)
 {
        struct device_node *np;
@@ -477,21 +516,28 @@ static int tegra_emc_probe(struct platform_device *pdev)
                return err;
        }
 
+       tegra20_clk_set_emc_round_callback(emc_round_rate, emc);
+
        emc->clk = devm_clk_get(&pdev->dev, "emc");
        if (IS_ERR(emc->clk)) {
                err = PTR_ERR(emc->clk);
                dev_err(&pdev->dev, "failed to get emc clock: %d\n", err);
-               return err;
+               goto unset_cb;
        }
 
        err = clk_notifier_register(emc->clk, &emc->clk_nb);
        if (err) {
                dev_err(&pdev->dev, "failed to register clk notifier: %d\n",
                        err);
-               return err;
+               goto unset_cb;
        }
 
        return 0;
+
+unset_cb:
+       tegra20_clk_set_emc_round_callback(NULL, NULL);
+
+       return err;
 }
 
 static const struct of_device_id tegra_emc_of_match[] = {