1 files changed, 112 insertions, 0 deletions

diff --git a/drivers/mmc/core/pwrseq.c b/drivers/mmc/core/pwrseq.c
new file mode 100644
index 000000000000..862356123d78
--- /dev/null
+++ b/drivers/mmc/core/pwrseq.c
@@ -0,0 +1,112 @@
+/*
+ *  Copyright (C) 2014 Linaro Ltd
+ *
+ * Author: Ulf Hansson <ulf.hansson@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ *
+ *  MMC power sequence management
+ */
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+
+#include <linux/mmc/host.h>
+
+#include "pwrseq.h"
+
+struct mmc_pwrseq_match {
+        const char *compatible;
+        int (*alloc)(struct mmc_host *host, struct device *dev);
+};
+
+static struct mmc_pwrseq_match pwrseq_match[] = {
+        {
+                .compatible = "mmc-pwrseq-simple",
+                .alloc = mmc_pwrseq_simple_alloc,
+        }, {
+                .compatible = "mmc-pwrseq-emmc",
+                .alloc = mmc_pwrseq_emmc_alloc,
+        },
+};
+
+static struct mmc_pwrseq_match *mmc_pwrseq_find(struct device_node *np)
+{
+        struct mmc_pwrseq_match *match = ERR_PTR(-ENODEV);
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(pwrseq_match); i++) {
+                if (of_device_is_compatible(np, pwrseq_match[i].compatible)) {
+                        match = &pwrseq_match[i];
+                        break;
+                }
+        }
+
+        return match;
+}
+
+int mmc_pwrseq_alloc(struct mmc_host *host)
+{
+        struct platform_device *pdev;
+        struct device_node *np;
+        struct mmc_pwrseq_match *match;
+        int ret = 0;
+
+        np = of_parse_phandle(host->parent->of_node, "mmc-pwrseq", 0);
+        if (!np)
+                return 0;
+
+        pdev = of_find_device_by_node(np);
+        if (!pdev) {
+                ret = -ENODEV;
+                goto err;
+        }
+
+        match = mmc_pwrseq_find(np);
+        if (IS_ERR(match)) {
+                ret = PTR_ERR(match);
+                goto err;
+        }
+
+        ret = match->alloc(host, &pdev->dev);
+        if (!ret)
+                dev_info(host->parent, "allocated mmc-pwrseq\n");
+
+err:
+        of_node_put(np);
+        return ret;
+}
+
+void mmc_pwrseq_pre_power_on(struct mmc_host *host)
+{
+        struct mmc_pwrseq *pwrseq = host->pwrseq;
+
+        if (pwrseq && pwrseq->ops && pwrseq->ops->pre_power_on)
+                pwrseq->ops->pre_power_on(host);
+}
+
+void mmc_pwrseq_post_power_on(struct mmc_host *host)
+{
+        struct mmc_pwrseq *pwrseq = host->pwrseq;
+
+        if (pwrseq && pwrseq->ops && pwrseq->ops->post_power_on)
+                pwrseq->ops->post_power_on(host);
+}
+
+void mmc_pwrseq_power_off(struct mmc_host *host)
+{
+        struct mmc_pwrseq *pwrseq = host->pwrseq;
+
+        if (pwrseq && pwrseq->ops && pwrseq->ops->power_off)
+                pwrseq->ops->power_off(host);
+}
+
+void mmc_pwrseq_free(struct mmc_host *host)
+{
+        struct mmc_pwrseq *pwrseq = host->pwrseq;
+
+        if (pwrseq && pwrseq->ops && pwrseq->ops->free)
+                pwrseq->ops->free(host);
+}