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authorSrinivas Kandagatla <srinivas.kandagatla@linaro.org>2016-04-14 16:02:16 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2016-05-02 11:33:30 +0300
commitd97a1e5d7cd2b5b0edc02a40fe6897b710c9e10f (patch)
tree7e0d4ee36b583c9371e1b4867a5c50f445f962c4 /drivers/mmc/core/pwrseq.c
parentf01b72d0fd53b61cafd25b16d15e18b1ef8ae065 (diff)
downloadlinux-d97a1e5d7cd2b5b0edc02a40fe6897b710c9e10f.tar.xz
mmc: pwrseq: convert to proper platform device
simple-pwrseq and emmc-pwrseq drivers rely on platform_device structure from of_find_device_by_node(), this works mostly. But, as there is no driver associated with this devices, cases like default/init pinctrl setup would never be performed by pwrseq. This becomes problem when the gpios used in pwrseq require pinctrl setup. Currently most of the common pinctrl setup is done in drivers/base/pinctrl.c by pinctrl_bind_pins(). There are two ways to solve this issue on either convert pwrseq drivers to a proper platform drivers or copy the exact code from pcintrl_bind_pins(). I prefer converting pwrseq to proper drivers so that other cases like setting up clks/parents from dt would also be possible. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/core/pwrseq.c')
-rw-r--r--drivers/mmc/core/pwrseq.c108
1 files changed, 49 insertions, 59 deletions
diff --git a/drivers/mmc/core/pwrseq.c b/drivers/mmc/core/pwrseq.c
index 4c1d1757dbf9..9386c4771814 100644
--- a/drivers/mmc/core/pwrseq.c
+++ b/drivers/mmc/core/pwrseq.c
@@ -8,88 +8,55 @@
* MMC power sequence management
*/
#include <linux/kernel.h>
-#include <linux/platform_device.h>
#include <linux/err.h>
+#include <linux/module.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;
-}
+static DEFINE_MUTEX(pwrseq_list_mutex);
+static LIST_HEAD(pwrseq_list);
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;
+ struct mmc_pwrseq *p;
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;
- }
+ mutex_lock(&pwrseq_list_mutex);
+ list_for_each_entry(p, &pwrseq_list, pwrseq_node) {
+ if (p->dev->of_node == np) {
+ if (!try_module_get(p->owner))
+ dev_err(host->parent,
+ "increasing module refcount failed\n");
+ else
+ host->pwrseq = p;
- match = mmc_pwrseq_find(np);
- if (IS_ERR(match)) {
- ret = PTR_ERR(match);
- goto err;
+ break;
+ }
}
- pwrseq = match->alloc(host, &pdev->dev);
- if (IS_ERR(pwrseq)) {
- ret = PTR_ERR(pwrseq);
- goto err;
- }
+ of_node_put(np);
+ mutex_unlock(&pwrseq_list_mutex);
+
+ if (!host->pwrseq)
+ return -EPROBE_DEFER;
- host->pwrseq = pwrseq;
dev_info(host->parent, "allocated mmc-pwrseq\n");
-err:
- of_node_put(np);
- return ret;
+ return 0;
}
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)
+ if (pwrseq && pwrseq->ops->pre_power_on)
pwrseq->ops->pre_power_on(host);
}
@@ -97,7 +64,7 @@ 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)
+ if (pwrseq && pwrseq->ops->post_power_on)
pwrseq->ops->post_power_on(host);
}
@@ -105,7 +72,7 @@ void mmc_pwrseq_power_off(struct mmc_host *host)
{
struct mmc_pwrseq *pwrseq = host->pwrseq;
- if (pwrseq && pwrseq->ops && pwrseq->ops->power_off)
+ if (pwrseq && pwrseq->ops->power_off)
pwrseq->ops->power_off(host);
}
@@ -113,8 +80,31 @@ 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);
+ if (pwrseq) {
+ module_put(pwrseq->owner);
+ host->pwrseq = NULL;
+ }
+}
+
+int mmc_pwrseq_register(struct mmc_pwrseq *pwrseq)
+{
+ if (!pwrseq || !pwrseq->ops || !pwrseq->dev)
+ return -EINVAL;
- host->pwrseq = NULL;
+ mutex_lock(&pwrseq_list_mutex);
+ list_add(&pwrseq->pwrseq_node, &pwrseq_list);
+ mutex_unlock(&pwrseq_list_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mmc_pwrseq_register);
+
+void mmc_pwrseq_unregister(struct mmc_pwrseq *pwrseq)
+{
+ if (pwrseq) {
+ mutex_lock(&pwrseq_list_mutex);
+ list_del(&pwrseq->pwrseq_node);
+ mutex_unlock(&pwrseq_list_mutex);
+ }
}
+EXPORT_SYMBOL_GPL(mmc_pwrseq_unregister);