[PATCH 3/3] net: ethernet: bgmac: driver power manangement

Jon Mason
2017-02-03T21:39:52Z

From: Joey Zhong <zhongx@broadcom.com>

Implements suspend/resume, external phy 54810 is assumed
to remain powered up during deep-sleep for wake-on-lane.

Signed-off-by: Joey Zhong <zhongx@broadcom.com>
Signed-off-by: Jon Mason <jon.mason@broadcom.com>
---
drivers/net/ethernet/broadcom/bgmac-platform.c | 34 +++++++++++++++++
drivers/net/ethernet/broadcom/bgmac.c | 53 ++++++++++++++++++++++++++
drivers/net/ethernet/broadcom/bgmac.h | 2 +
3 files changed, 89 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bgmac-platform.c b/drivers/net/ethernet/broadcom/bgmac-platform.c
index 2d153f7..3df91e7 100644
--- a/drivers/net/ethernet/broadcom/bgmac-platform.c
+++ b/drivers/net/ethernet/broadcom/bgmac-platform.c
@@ -21,8 +21,12 @@
#include <linux/of_net.h>
#include "bgmac.h"

+#define NICPM_PADRING_CFG 0x00000004
#define NICPM_IOMUX_CTRL 0x00000008

+#define NICPM_PADRING_CFG_INIT_VAL 0x74000000
+#define NICPM_IOMUX_CTRL_INIT_VAL_AX 0x21880000
+
#define NICPM_IOMUX_CTRL_INIT_VAL 0x3196e000
#define NICPM_IOMUX_CTRL_SPD_SHIFT 10
#define NICPM_IOMUX_CTRL_SPD_10M 0
@@ -108,6 +112,10 @@ static void bgmac_nicpm_speed_set(struct net_device *net_dev)
if (!bgmac->plat.nicpm_base)
return;

+ /* SET RGMII IO CONFIG */
+ writel(NICPM_PADRING_CFG_INIT_VAL,
+ bgmac->plat.nicpm_base + NICPM_PADRING_CFG);
+
val = NICPM_IOMUX_CTRL_INIT_VAL;
switch (bgmac->net_dev->phydev->speed) {
default:
@@ -239,6 +247,31 @@ static int bgmac_remove(struct platform_device *pdev)
return 0;
}

+#ifdef CONFIG_PM
+static int bgmac_suspend(struct device *dev)
+{
+ struct bgmac *bgmac = dev_get_drvdata(dev);
+
+ return bgmac_enet_suspend(bgmac);
+}
+
+static int bgmac_resume(struct device *dev)
+{
+ struct bgmac *bgmac = dev_get_drvdata(dev);
+
+ return bgmac_enet_resume(bgmac);
+}
+
+static const struct dev_pm_ops bgmac_pm_ops = {
+ .suspend = bgmac_suspend,
+ .resume = bgmac_resume
+};
+
+#define BGMAC_PM_OPS (&bgmac_pm_ops)
+#else
+#define BGMAC_PM_OPS NULL
+#endif /* CONFIG_PM */
+
static const struct of_device_id bgmac_of_enet_match[] = {
{.compatible = "brcm,amac",},
{.compatible = "brcm,nsp-amac",},
@@ -252,6 +285,7 @@ static struct platform_driver bgmac_enet_driver = {
.driver = {
.name = "bgmac-enet",
.of_match_table = bgmac_of_enet_match,
+ .pm = BGMAC_PM_OPS
},
.probe = bgmac_probe,
.remove = bgmac_remove,
diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index bd549f8..8d3aada 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -1478,6 +1478,7 @@ int bgmac_enet_probe(struct bgmac *bgmac)

net_dev->irq = bgmac->irq;
SET_NETDEV_DEV(net_dev, bgmac->dev);
+ dev_set_drvdata(bgmac->dev, bgmac);

if (!is_valid_ether_addr(bgmac->mac_addr)) {
dev_err(bgmac->dev, "Invalid MAC addr: %pM\n",
@@ -1551,5 +1552,57 @@ void bgmac_enet_remove(struct bgmac *bgmac)
}
EXPORT_SYMBOL_GPL(bgmac_enet_remove);

+int bgmac_enet_suspend(struct bgmac *bgmac)
+{
+ netdev_info(bgmac->net_dev, "Suspending\n");
+
+ if (netif_running(bgmac->net_dev)) {
+ netif_stop_queue(bgmac->net_dev);
+
+ napi_disable(&bgmac->napi);
+
+ netif_tx_lock(bgmac->net_dev);
+ netif_device_detach(bgmac->net_dev);
+ netif_tx_unlock(bgmac->net_dev);
+
+ bgmac_chip_intrs_off(bgmac);
+ bgmac_chip_reset(bgmac);
+ bgmac_dma_cleanup(bgmac);
+ }
+
+ phy_stop(bgmac->net_dev->phydev);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(bgmac_enet_suspend);
+
+int bgmac_enet_resume(struct bgmac *bgmac)
+{
+ int rc;
+
+ netdev_info(bgmac->net_dev, "Resuming\n");
+
+ phy_start(bgmac->net_dev->phydev);
+
+ if (netif_running(bgmac->net_dev)) {
+ rc = bgmac_dma_init(bgmac);
+ if (rc)
+ return rc;
+
+ bgmac_chip_init(bgmac);
+
+ napi_enable(&bgmac->napi);
+
+ netif_tx_lock(bgmac->net_dev);
+ netif_device_attach(bgmac->net_dev);
+ netif_tx_unlock(bgmac->net_dev);
+
+ netif_start_queue(bgmac->net_dev);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(bgmac_enet_resume);
+
MODULE_AUTHOR("Rafał Miłecki");
MODULE_LICENSE("GPL");
diff --git a/drivers/net/ethernet/broadcom/bgmac.h b/drivers/net/ethernet/broadcom/bgmac.h
index 5a518fe..741ca27 100644
--- a/drivers/net/ethernet/broadcom/bgmac.h
+++ b/drivers/net/ethernet/broadcom/bgmac.h
@@ -538,6 +538,8 @@ int bgmac_enet_probe(struct bgmac *bgmac);
void bgmac_enet_remove(struct bgmac *bgmac);
void bgmac_adjust_link(struct net_device *net_dev);
int bgmac_phy_connect_direct(struct bgmac *bgmac);
+int bgmac_enet_suspend(struct bgmac *bgmac);
+int bgmac_enet_resume(struct bgmac *bgmac);

struct mii_bus *bcma_mdio_mii_register(struct bgmac *bgmac);
void bcma_mdio_mii_unregister(struct mii_bus *mii_bus);
--
2.7.4