summaryrefslogtreecommitdiff
path: root/drivers/mmc
diff options
context:
space:
mode:
authorUlf Hansson <ulf.hansson@linaro.org>2014-12-05 14:36:58 +0100
committerUlf Hansson <ulf.hansson@linaro.org>2015-01-28 12:32:07 +0100
commit8c96f89c62ecc8334d06820bff62ecf81be97c2b (patch)
tree8feac978c3df53147199f59b5fa7976de5218a0e /drivers/mmc
parent0e6d633274db7b4db14a1194163b4d31d37b261f (diff)
downloadkernel-8c96f89c62ecc8334d06820bff62ecf81be97c2b.tar.gz
mmc: pwrseq: Initial support for the simple MMC power sequence provider
To add the core part for the MMC power sequence, let's start by adding initial support for the simple MMC power sequence provider. In this initial step, the MMC power sequence node are fetched and the compatible string for the simple MMC power sequence provider are verified. At this point we don't parse the node for any properties, but instead that will be handled from following patches. Since there are no properties supported yet, let's just implement the ->alloc() and the ->free() callbacks. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/Makefile2
-rw-r--r--drivers/mmc/core/pwrseq.c61
-rw-r--r--drivers/mmc/core/pwrseq.h2
-rw-r--r--drivers/mmc/core/pwrseq_simple.c48
4 files changed, 111 insertions, 2 deletions
diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile
index ccdd35f78256..b39cbd2f830b 100644
--- a/drivers/mmc/core/Makefile
+++ b/drivers/mmc/core/Makefile
@@ -8,5 +8,5 @@ mmc_core-y := core.o bus.o host.o \
sdio.o sdio_ops.o sdio_bus.o \
sdio_cis.o sdio_io.o sdio_irq.o \
quirks.o slot-gpio.o
-mmc_core-$(CONFIG_OF) += pwrseq.o
+mmc_core-$(CONFIG_OF) += pwrseq.o pwrseq_simple.o
mmc_core-$(CONFIG_DEBUG_FS) += debugfs.o
diff --git a/drivers/mmc/core/pwrseq.c b/drivers/mmc/core/pwrseq.c
index bd087723929f..2cea00ed4e65 100644
--- a/drivers/mmc/core/pwrseq.c
+++ b/drivers/mmc/core/pwrseq.c
@@ -7,14 +7,73 @@
*
* 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,
+ },
+};
+
+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)
{
- return 0;
+ 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)
diff --git a/drivers/mmc/core/pwrseq.h b/drivers/mmc/core/pwrseq.h
index 12aaf2b4745b..bd860d88f116 100644
--- a/drivers/mmc/core/pwrseq.h
+++ b/drivers/mmc/core/pwrseq.h
@@ -27,6 +27,8 @@ void mmc_pwrseq_post_power_on(struct mmc_host *host);
void mmc_pwrseq_power_off(struct mmc_host *host);
void mmc_pwrseq_free(struct mmc_host *host);
+int mmc_pwrseq_simple_alloc(struct mmc_host *host, struct device *dev);
+
#else
static inline int mmc_pwrseq_alloc(struct mmc_host *host) { return 0; }
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
new file mode 100644
index 000000000000..61c991e4009d
--- /dev/null
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2014 Linaro Ltd
+ *
+ * Author: Ulf Hansson <ulf.hansson@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ *
+ * Simple MMC power sequence management
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/err.h>
+
+#include <linux/mmc/host.h>
+
+#include "pwrseq.h"
+
+struct mmc_pwrseq_simple {
+ struct mmc_pwrseq pwrseq;
+};
+
+static void mmc_pwrseq_simple_free(struct mmc_host *host)
+{
+ struct mmc_pwrseq_simple *pwrseq = container_of(host->pwrseq,
+ struct mmc_pwrseq_simple, pwrseq);
+
+ kfree(pwrseq);
+ host->pwrseq = NULL;
+}
+
+static struct mmc_pwrseq_ops mmc_pwrseq_simple_ops = {
+ .free = mmc_pwrseq_simple_free,
+};
+
+int mmc_pwrseq_simple_alloc(struct mmc_host *host, struct device *dev)
+{
+ struct mmc_pwrseq_simple *pwrseq;
+
+ pwrseq = kzalloc(sizeof(struct mmc_pwrseq_simple), GFP_KERNEL);
+ if (!pwrseq)
+ return -ENOMEM;
+
+ pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops;
+ host->pwrseq = &pwrseq->pwrseq;
+
+ return 0;
+}