From: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
On many architectures, drivers are supposed to prepare/unprepare &
enable/disable functional clock of device. This patch adds clock support for
ahci_platform.
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
drivers/ata/ahci.h | 2 ++
drivers/ata/ahci_platform.c | 57 +++++++++++++++++++++++++++++++++++++++------
2 files changed, 52 insertions(+), 7 deletions(-)
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 57eb1c2..838a262 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -35,6 +35,7 @@
#ifndef _AHCI_H
#define _AHCI_H
+#include <linux/clk.h>
#include <linux/libata.h>
/* Enclosure Management Control */
@@ -302,6 +303,7 @@ struct ahci_host_priv {
u32 em_loc; /* enclosure management location */
u32 em_buf_sz; /* EM buffer size in byte */
u32 em_msg_type; /* EM message type */
+ struct clk *clk; /* Only for platforms supporting clk */
};
extern int ahci_ignore_sss;
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 09728e0..90c2eb9 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -12,6 +12,7 @@
* any later version.
*/
+#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/module.h>
@@ -118,6 +119,17 @@ static int __init ahci_probe(struct platform_device *pdev)
return -ENOMEM;
}
+ hpriv->clk = clk_get(dev, NULL);
+ if (IS_ERR(hpriv->clk)) {
+ dev_err(dev, "can't get clock\n");
+ } else {
+ rc = clk_prepare_enable(hpriv->clk);
+ if (rc) {
+ dev_err(dev, "clock prepare enable failed");
+ goto free_clk;
+ }
+ }
+
/*
* Some platforms might need to prepare for mmio region access,
* which could be done in the following init call. So, the mmio
@@ -127,7 +139,7 @@ static int __init ahci_probe(struct platform_device *pdev)
if (pdata && pdata->init) {
rc = pdata->init(dev, hpriv->mmio);
if (rc)
- return rc;
+ goto disable_unprepare_clk;
}
ahci_save_initial_config(dev, hpriv,
@@ -153,7 +165,7 @@ static int __init ahci_probe(struct platform_device *pdev)
host = ata_host_alloc_pinfo(dev, ppi, n_ports);
if (!host) {
rc = -ENOMEM;
- goto err0;
+ goto pdata_exit;
}
host->private_data = hpriv;
@@ -183,7 +195,7 @@ static int __init ahci_probe(struct platform_device *pdev)
rc = ahci_reset_controller(host);
if (rc)
- goto err0;
+ goto pdata_exit;
ahci_init_controller(host);
ahci_print_info(host, "platform");
@@ -191,12 +203,18 @@ static int __init ahci_probe(struct platform_device *pdev)
rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
&ahci_platform_sht);
if (rc)
- goto err0;
+ goto pdata_exit;
return 0;
-err0:
+pdata_exit:
if (pdata && pdata->exit)
pdata->exit(dev);
+disable_unprepare_clk:
+ if (!IS_ERR(hpriv->clk))
+ clk_disable_unprepare(hpriv->clk);
+free_clk:
+ if (!IS_ERR(hpriv->clk))
+ clk_put(hpriv->clk);
return rc;
}
@@ -205,12 +223,18 @@ static int __devexit ahci_remove(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct ahci_platform_data *pdata = dev_get_platdata(dev);
struct ata_host *host = dev_get_drvdata(dev);
+ struct ahci_host_priv *hpriv = host->private_data;
ata_host_detach(host);
if (pdata && pdata->exit)
pdata->exit(dev);
+ if (!IS_ERR(hpriv->clk)) {
+ clk_disable_unprepare(hpriv->clk);
+ clk_put(hpriv->clk);
+ }
+
return 0;
}
@@ -245,6 +269,10 @@ static int ahci_suspend(struct device *dev)
if (pdata && pdata->suspend)
return pdata->suspend(dev);
+
+ if (!IS_ERR(hpriv->clk))
+ clk_disable_unprepare(hpriv->clk);
+
return 0;
}
@@ -252,18 +280,27 @@ static int ahci_resume(struct device *dev)
{
struct ahci_platform_data *pdata = dev_get_platdata(dev);
struct ata_host *host = dev_get_drvdata(dev);
+ struct ahci_host_priv *hpriv = host->private_data;
int rc;
+ if (!IS_ERR(hpriv->clk)) {
+ rc = clk_prepare_enable(hpriv->clk);
+ if (rc) {
+ dev_err(dev, "clock prepare enable failed");
+ return rc;
+ }
+ }
+
if (pdata && pdata->resume) {
rc = pdata->resume(dev);
if (rc)
- return rc;
+ goto disable_unprepare_clk;
}
if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
rc = ahci_reset_controller(host);
if (rc)
- return rc;
+ goto disable_unprepare_clk;
ahci_init_controller(host);
}
@@ -271,6 +308,12 @@ static int ahci_resume(struct device *dev)
ata_host_resume(host);
return 0;
+
+disable_unprepare_clk:
+ if (!IS_ERR(hpriv->clk))
+ clk_disable_unprepare(hpriv->clk);
+
+ return rc;
}
#endif
--
1.7.12.rc2.18.g61b472e
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