[6/6] mmc: sdhci-bcm-kona: Add basic use of clocks

Commit Message

Tim Kryger Oct. 3, 2013, 8:13 p.m. UTC

Enable the external clock needed by the host controller during the
probe and disable it during the remove.

Signed-off-by: Tim Kryger <[e-mail]>
Reviewed-by: Markus Mayer <[e-mail]>
Reviewed-by: Matt Porter <[e-mail]>
---
 drivers/mmc/host/sdhci-bcm-kona.c | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/mmc/host/sdhci-bcm-kona.c b/drivers/mmc/host/sdhci-bcm-kona.c
index 85472d3..91db099 100644
--- a/drivers/mmc/host/sdhci-bcm-kona.c
+++ b/drivers/mmc/host/sdhci-bcm-kona.c
@@ -54,6 +54,7 @@ 
 
 struct sdhci_bcm_kona_dev {
 	struct mutex	write_lock; /* protect back to back writes */
+	struct clk	*external_clk;
 };
 
 
@@ -252,11 +253,29 @@  static int sdhci_bcm_kona_probe(struct platform_device *pdev)
 	mmc_of_parse(host->mmc);
 
 	if (!host->mmc->f_max) {
-		dev_err(&pdev->dev, "Missing max-freq for SDHCI cfg\n");
+		dev_err(dev, "Missing max-freq for SDHCI cfg\n");
 		ret = -ENXIO;
 		goto err_pltfm_free;
 	}
 
+	/* Get and enable the external clock */
+	kona_dev->external_clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(kona_dev->external_clk)) {
+		dev_err(dev, "Failed to get external clock\n");
+		ret = PTR_ERR(kona_dev->external_clk);
+		goto err_pltfm_free;
+	}
+
+	if (clk_set_rate(kona_dev->external_clk, host->mmc->f_max) != 0) {
+		dev_err(dev, "Failed to set rate external clock\n");
+		goto err_pltfm_free;
+	}
+
+	if (clk_prepare_enable(kona_dev->external_clk) != 0) {
+		dev_err(dev, "Failed to enable external clock\n");
+		goto err_pltfm_free;
+	}
+
 	dev_dbg(dev, "non-removable=%c\n",
 		(host->mmc->caps & MMC_CAP_NONREMOVABLE) ? 'Y' : 'N');
 	dev_dbg(dev, "cd_gpio %c, wp_gpio %c\n",
@@ -271,7 +290,7 @@  static int sdhci_bcm_kona_probe(struct platform_device *pdev)
 
 	ret = sdhci_bcm_kona_sd_reset(host);
 	if (ret)
-		goto err_pltfm_free;
+		goto err_clk_disable;
 
 	sdhci_bcm_kona_sd_init(host);
 
@@ -307,6 +326,9 @@  err_remove_host:
 err_reset:
 	sdhci_bcm_kona_sd_reset(host);
 
+err_clk_disable:
+	clk_disable_unprepare(kona_dev->external_clk);
+
 err_pltfm_free:
 	sdhci_pltfm_free(pdev);
 
@@ -317,6 +339,8 @@  err_pltfm_free:
 static int __exit sdhci_bcm_kona_remove(struct platform_device *pdev)
 {
 	struct sdhci_host *host = platform_get_drvdata(pdev);
+	struct sdhci_pltfm_host *pltfm_priv = sdhci_priv(host);
+	struct sdhci_bcm_kona_dev *kona_dev = sdhci_pltfm_priv(pltfm_priv);
 	int dead;
 	u32 scratch;
 
@@ -326,6 +350,8 @@  static int __exit sdhci_bcm_kona_remove(struct platform_device *pdev)
 		dead = 1;
 	sdhci_remove_host(host, dead);
 
+	clk_disable_unprepare(kona_dev->external_clk);
+
 	sdhci_free_host(host);
 
 	return 0;