Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / mmc / core / pwrseq.c

diff --git a/kernel/drivers/mmc/core/pwrseq.c b/kernel/drivers/mmc/core/pwrseq.c
new file mode 100644 (file)
index 0000000..4c1d175
--- /dev/null
+++ b/kernel/drivers/mmc/core/pwrseq.c
@@ -0,0 +1,120 @@
+/*
+ *  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;
+       struct mmc_pwrseq *(*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;
+       struct mmc_pwrseq *pwrseq;
+       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;
+       }
+
+       pwrseq = match->alloc(host, &pdev->dev);
+       if (IS_ERR(pwrseq)) {
+               ret = PTR_ERR(pwrseq);
+               goto err;
+       }
+
+       host->pwrseq = pwrseq;
+       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);
+
+       host->pwrseq = NULL;
+}