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ata: libahci: Allow using multiple regulators

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The current implementation of the libahci allows using multiple PHYs
but not multiple regulators. This patch adds the support of multiple
regulators. Until now it was mandatory to have a PHY under a subnode,
now a port subnode can contain either a regulator or a PHY (or both).

In order to be able to asociate a port with a regulator the port are
now a platform device in the device tree case.

There was only one driver which used directly the regulator field of
the ahci_host_priv structure. To preserve the bisectability the change
in the ahci_imx driver was done in the same patch.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Gregory CLEMENT 2015-01-15 15:09:37 +01:00 committed by Tejun Heo
parent 6bd1599607
commit c7d7ddee7e
4 changed files with 173 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/ata/ahci.h
View File

@ -333,7 +333,7 @@ struct ahci_host_priv {
u32 em_msg_type; /* EM message type */
bool got_runtime_pm; /* Did we do pm_runtime_get? */
struct clk *clks[AHCI_MAX_CLKS]; /* Optional */
struct regulator *target_pwr; /* Optional */
struct regulator **target_pwrs; /* Optional */
/*
* If platform uses PHYs. There is a 1:1 relation between the port number and
* the PHY position in this array.

14
drivers/ata/ahci_imx.c
View File

@ -221,11 +221,9 @@ static int imx_sata_enable(struct ahci_host_priv *hpriv)
if (imxpriv->no_device)
return 0;
if (hpriv->target_pwr) {
ret = regulator_enable(hpriv->target_pwr);
if (ret)
return ret;
}
ret = ahci_platform_enable_regulators(hpriv);
if (ret)
return ret;
ret = clk_prepare_enable(imxpriv->sata_ref_clk);
if (ret < 0)
@ -270,8 +268,7 @@ static int imx_sata_enable(struct ahci_host_priv *hpriv)
disable_clk:
clk_disable_unprepare(imxpriv->sata_ref_clk);
disable_regulator:
if (hpriv->target_pwr)
regulator_disable(hpriv->target_pwr);
ahci_platform_disable_regulators(hpriv);
return ret;
}
@ -291,8 +288,7 @@ static void imx_sata_disable(struct ahci_host_priv *hpriv)
clk_disable_unprepare(imxpriv->sata_ref_clk);
if (hpriv->target_pwr)
regulator_disable(hpriv->target_pwr);
ahci_platform_disable_regulators(hpriv);
}
static void ahci_imx_error_handler(struct ata_port *ap)

230
drivers/ata/libahci_platform.c
View File

@ -24,6 +24,7 @@
#include <linux/ahci_platform.h>
#include <linux/phy/phy.h>
#include <linux/pm_runtime.h>
#include <linux/of_platform.h>
#include "ahci.h"
static void ahci_host_stop(struct ata_host *host);
@ -137,6 +138,59 @@ void ahci_platform_disable_clks(struct ahci_host_priv *hpriv)
}
EXPORT_SYMBOL_GPL(ahci_platform_disable_clks);
/**
* ahci_platform_enable_regulators - Enable regulators
* @hpriv: host private area to store config values
*
* This function enables all the regulators found in
* hpriv->target_pwrs, if any. If a regulator fails to be enabled, it
* disables all the regulators already enabled in reverse order and
* returns an error.
*
* RETURNS:
* 0 on success otherwise a negative error code
*/
int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv)
{
int rc, i;
for (i = 0; i < hpriv->nports; i++) {
if (!hpriv->target_pwrs[i])
continue;
rc = regulator_enable(hpriv->target_pwrs[i]);
if (rc)
goto disable_target_pwrs;
}
return 0;
disable_target_pwrs:
while (--i >= 0)
if (hpriv->target_pwrs[i])
regulator_disable(hpriv->target_pwrs[i]);
return rc;
}
EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators);
/**
* ahci_platform_disable_regulators - Disable regulators
* @hpriv: host private area to store config values
*
* This function disables all regulators found in hpriv->target_pwrs.
*/
void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv)
{
int i;
for (i = 0; i < hpriv->nports; i++) {
if (!hpriv->target_pwrs[i])
continue;
regulator_disable(hpriv->target_pwrs[i]);
}
}
EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators);
/**
* ahci_platform_enable_resources - Enable platform resources
* @hpriv: host private area to store config values
@ -157,11 +211,9 @@ int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
{
int rc;
if (hpriv->target_pwr) {
rc = regulator_enable(hpriv->target_pwr);
if (rc)
return rc;
}
rc = ahci_platform_enable_regulators(hpriv);
if (rc)
return rc;
rc = ahci_platform_enable_clks(hpriv);
if (rc)
@ -177,8 +229,8 @@ disable_clks:
ahci_platform_disable_clks(hpriv);
disable_regulator:
if (hpriv->target_pwr)
regulator_disable(hpriv->target_pwr);
ahci_platform_disable_regulators(hpriv);
return rc;
}
EXPORT_SYMBOL_GPL(ahci_platform_enable_resources);
@ -199,8 +251,7 @@ void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
ahci_platform_disable_clks(hpriv);
if (hpriv->target_pwr)
regulator_disable(hpriv->target_pwr);
ahci_platform_disable_regulators(hpriv);
}
EXPORT_SYMBOL_GPL(ahci_platform_disable_resources);
@ -216,6 +267,68 @@ static void ahci_platform_put_resources(struct device *dev, void *res)
for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++)
clk_put(hpriv->clks[c]);
/*
* The regulators are tied to child node device and not to the
* SATA device itself. So we can't use devm for automatically
* releasing them. We have to do it manually here.
*/
for (c = 0; c < hpriv->nports; c++)
if (hpriv->target_pwrs && hpriv->target_pwrs[c])
regulator_put(hpriv->target_pwrs[c]);
}
static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port,
struct device *dev, struct device_node *node)
{
int rc;
hpriv->phys[port] = devm_of_phy_get(dev, node, NULL);
if (!IS_ERR(hpriv->phys[port]))
return 0;
rc = PTR_ERR(hpriv->phys[port]);
switch (rc) {
case -ENOSYS:
/* No PHY support. Check if PHY is required. */
if (of_find_property(node, "phys", NULL)) {
dev_err(dev,
"couldn't get PHY in node %s: ENOSYS\n",
node->name);
break;
}
case -ENODEV:
/* continue normally */
hpriv->phys[port] = NULL;
rc = 0;
break;
default:
dev_err(dev,
"couldn't get PHY in node %s: %d\n",
node->name, rc);
break;
}
return rc;
}
static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port,
struct device *dev)
{
struct regulator *target_pwr;
int rc = 0;
target_pwr = regulator_get_optional(dev, "target");
if (!IS_ERR(target_pwr))
hpriv->target_pwrs[port] = target_pwr;
else
rc = PTR_ERR(target_pwr);
return rc;
}
/**
@ -240,7 +353,7 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
struct ahci_host_priv *hpriv;
struct clk *clk;
struct device_node *child;
int i, enabled_ports = 0, rc = -ENOMEM;
int i, sz, enabled_ports = 0, rc = -ENOMEM, child_nodes;
u32 mask_port_map = 0;
if (!devres_open_group(dev, NULL, GFP_KERNEL))
@ -261,14 +374,6 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
goto err_out;
}
hpriv->target_pwr = devm_regulator_get_optional(dev, "target");
if (IS_ERR(hpriv->target_pwr)) {
rc = PTR_ERR(hpriv->target_pwr);
if (rc == -EPROBE_DEFER)
goto err_out;
hpriv->target_pwr = NULL;
}
for (i = 0; i < AHCI_MAX_CLKS; i++) {
/*
* For now we must use clk_get(dev, NULL) for the first clock,
@ -290,19 +395,33 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
hpriv->clks[i] = clk;
}
hpriv->nports = of_get_child_count(dev->of_node);
hpriv->nports = child_nodes = of_get_child_count(dev->of_node);
if (hpriv->nports) {
hpriv->phys = devm_kzalloc(dev,
hpriv->nports * sizeof(*hpriv->phys),
GFP_KERNEL);
if (!hpriv->phys) {
rc = -ENOMEM;
goto err_out;
}
/*
* If no sub-node was found, we still need to set nports to
* one in order to be able to use the
* ahci_platform_[en|dis]able_[phys|regulators] functions.
*/
if (!child_nodes)
hpriv->nports = 1;
sz = hpriv->nports * sizeof(*hpriv->phys);
hpriv->phys = devm_kzalloc(dev, sz, GFP_KERNEL);
if (!hpriv->phys) {
rc = -ENOMEM;
goto err_out;
}
sz = hpriv->nports * sizeof(*hpriv->target_pwrs);
hpriv->target_pwrs = devm_kzalloc(dev, sz, GFP_KERNEL);
if (!hpriv->target_pwrs) {
rc = -ENOMEM;
goto err_out;
}
if (child_nodes) {
for_each_child_of_node(dev->of_node, child) {
u32 port;
struct platform_device *port_dev;
if (!of_device_is_available(child))
continue;
@ -316,18 +435,23 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
dev_warn(dev, "invalid port number %d\n", port);
continue;
}
mask_port_map |= BIT(port);
hpriv->phys[port] = devm_of_phy_get(dev, child, NULL);
if (IS_ERR(hpriv->phys[port])) {
rc = PTR_ERR(hpriv->phys[port]);
dev_err(dev,
"couldn't get PHY in node %s: %d\n",
child->name, rc);
goto err_out;
of_platform_device_create(child, NULL, NULL);
port_dev = of_find_device_by_node(child);
if (port_dev) {
rc = ahci_platform_get_regulator(hpriv, port,
&port_dev->dev);
if (rc == -EPROBE_DEFER)
goto err_out;
}
rc = ahci_platform_get_phy(hpriv, port, dev, child);
if (rc)
goto err_out;
enabled_ports++;
}
if (!enabled_ports) {
@ -343,38 +467,14 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
* If no sub-node was found, keep this for device tree
* compatibility
*/
struct phy *phy = devm_phy_get(dev, "sata-phy");
if (!IS_ERR(phy)) {
hpriv->phys = devm_kzalloc(dev, sizeof(*hpriv->phys),
GFP_KERNEL);
if (!hpriv->phys) {
rc = -ENOMEM;
goto err_out;
}
rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node);
if (rc)
goto err_out;
hpriv->phys[0] = phy;
hpriv->nports = 1;
} else {
rc = PTR_ERR(phy);
switch (rc) {
case -ENOSYS:
/* No PHY support. Check if PHY is required. */
if (of_find_property(dev->of_node, "phys", NULL)) {
dev_err(dev, "couldn't get sata-phy: ENOSYS\n");
goto err_out;
}
case -ENODEV:
/* continue normally */
hpriv->phys = NULL;
break;
default:
goto err_out;
}
}
rc = ahci_platform_get_regulator(hpriv, 0, dev);
if (rc == -EPROBE_DEFER)
goto err_out;
}
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
hpriv->got_runtime_pm = true;

2
include/linux/ahci_platform.h
View File

@ -24,6 +24,8 @@ struct platform_device;
int ahci_platform_enable_clks(struct ahci_host_priv *hpriv);
void ahci_platform_disable_clks(struct ahci_host_priv *hpriv);
int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv);
void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv);
int ahci_platform_enable_resources(struct ahci_host_priv *hpriv);
void ahci_platform_disable_resources(struct ahci_host_priv *hpriv);
struct ahci_host_priv *ahci_platform_get_resources(