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Date: Tue, 17 Mar 2020 17:50:03 +0100
From: Martin Fuzzey <martin.fuzzey@...wbird.group>
To: Fugang Duan <fugang.duan@....com>,
Rob Herring <robh+dt@...nel.org>,
Shawn Guo <shawnguo@...nel.org>,
"David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Fabio Estevam <festevam@...il.com>,
linux-kernel@...r.kernel.org,
Sascha Hauer <s.hauer@...gutronix.de>,
NXP Linux Team <linux-imx@....com>,
devicetree@...r.kernel.org
Subject: [PATCH 1/4] net: fec: set GPR bit on suspend by DT connfiguration.
On some SoCs, such as the i.MX6, it is necessary to set a bit
in the SoC level GPR register before suspending for wake on lan
to work.
The fec platform callback sleep_mode_enable was intended to allow this
but the platform implementation was NAK'd back in 2015 [1]
This means that, currently, wake on lan is broken on mainline for
the i.MX6 at least.
So implement the required bit setting in the fec driver by itself
by adding a new optional DT property indicating the register and
bit to set.
[1] https://www.spinics.net/lists/netdev/msg310922.html
Signed-off-by: Martin Fuzzey <martin.fuzzey@...wbird.group>
---
drivers/net/ethernet/freescale/fec.h | 7 +++
drivers/net/ethernet/freescale/fec_main.c | 72 ++++++++++++++++++++++++++++---
2 files changed, 72 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index f79e57f..d89568f 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -488,6 +488,12 @@ struct fec_enet_priv_rx_q {
struct sk_buff *rx_skbuff[RX_RING_SIZE];
};
+struct fec_stop_mode_gpr {
+ struct regmap *gpr;
+ u8 reg;
+ u8 bit;
+};
+
/* The FEC buffer descriptors track the ring buffers. The rx_bd_base and
* tx_bd_base always point to the base of the buffer descriptors. The
* cur_rx and cur_tx point to the currently available buffer.
@@ -562,6 +568,7 @@ struct fec_enet_private {
int hwts_tx_en;
struct delayed_work time_keep;
struct regulator *reg_phy;
+ struct fec_stop_mode_gpr stop_gpr;
unsigned int tx_align;
unsigned int rx_align;
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 23c5fef..3c78124 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -62,6 +62,8 @@
#include <linux/if_vlan.h>
#include <linux/pinctrl/consumer.h>
#include <linux/prefetch.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
#include <soc/imx/cpuidle.h>
#include <asm/cacheflush.h>
@@ -1092,11 +1094,28 @@ static void fec_enet_reset_skb(struct net_device *ndev)
}
+static void fec_enet_stop_mode(struct fec_enet_private *fep, bool enabled)
+{
+ struct fec_platform_data *pdata = fep->pdev->dev.platform_data;
+ struct fec_stop_mode_gpr *stop_gpr = &fep->stop_gpr;
+
+ if (stop_gpr->gpr) {
+ if (enabled)
+ regmap_update_bits(stop_gpr->gpr, stop_gpr->reg,
+ BIT(stop_gpr->bit),
+ BIT(stop_gpr->bit));
+ else
+ regmap_update_bits(stop_gpr->gpr, stop_gpr->reg,
+ BIT(stop_gpr->bit), 0);
+ } else if (pdata && pdata->sleep_mode_enable) {
+ pdata->sleep_mode_enable(enabled);
+ }
+}
+
static void
fec_stop(struct net_device *ndev)
{
struct fec_enet_private *fep = netdev_priv(ndev);
- struct fec_platform_data *pdata = fep->pdev->dev.platform_data;
u32 rmii_mode = readl(fep->hwp + FEC_R_CNTRL) & (1 << 8);
u32 val;
@@ -1125,9 +1144,7 @@ static void fec_enet_reset_skb(struct net_device *ndev)
val = readl(fep->hwp + FEC_ECNTRL);
val |= (FEC_ECR_MAGICEN | FEC_ECR_SLEEP);
writel(val, fep->hwp + FEC_ECNTRL);
-
- if (pdata && pdata->sleep_mode_enable)
- pdata->sleep_mode_enable(true);
+ fec_enet_stop_mode(fep, true);
}
writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
@@ -3397,6 +3414,43 @@ static int fec_enet_get_irq_cnt(struct platform_device *pdev)
return irq_cnt;
}
+static int fec_enet_of_parse_stop_mode(struct fec_enet_private *fep,
+ struct device_node *np)
+{
+ static const char prop[] = "fsl,stop-mode";
+ struct of_phandle_args args;
+ int ret;
+
+ ret = of_parse_phandle_with_fixed_args(np, prop, 2, 0, &args);
+ if (ret == -ENOENT)
+ return 0;
+ if (ret)
+ return ret;
+
+ if (args.args_count != 2) {
+ dev_err(&fep->pdev->dev,
+ "Bad %s args want gpr offset, bit\n", prop);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ fep->stop_gpr.gpr = syscon_node_to_regmap(args.np);
+ if (IS_ERR(fep->stop_gpr.gpr)) {
+ dev_err(&fep->pdev->dev, "could not find gpr regmap\n");
+ ret = PTR_ERR(fep->stop_gpr.gpr);
+ fep->stop_gpr.gpr = NULL;
+ goto out;
+ }
+
+ fep->stop_gpr.reg = args.args[0];
+ fep->stop_gpr.bit = args.args[1];
+
+out:
+ of_node_put(args.np);
+
+ return ret;
+}
+
static int
fec_probe(struct platform_device *pdev)
{
@@ -3463,6 +3517,10 @@ static int fec_enet_get_irq_cnt(struct platform_device *pdev)
if (of_get_property(np, "fsl,magic-packet", NULL))
fep->wol_flag |= FEC_WOL_HAS_MAGIC_PACKET;
+ ret = fec_enet_of_parse_stop_mode(fep, np);
+ if (ret)
+ goto failed_stop_mode;
+
phy_node = of_parse_phandle(np, "phy-handle", 0);
if (!phy_node && of_phy_is_fixed_link(np)) {
ret = of_phy_register_fixed_link(np);
@@ -3631,6 +3689,7 @@ static int fec_enet_get_irq_cnt(struct platform_device *pdev)
if (of_phy_is_fixed_link(np))
of_phy_deregister_fixed_link(np);
of_node_put(phy_node);
+failed_stop_mode:
failed_phy:
dev_id--;
failed_ioremap:
@@ -3708,7 +3767,6 @@ static int __maybe_unused fec_resume(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct fec_enet_private *fep = netdev_priv(ndev);
- struct fec_platform_data *pdata = fep->pdev->dev.platform_data;
int ret;
int val;
@@ -3726,8 +3784,8 @@ static int __maybe_unused fec_resume(struct device *dev)
goto failed_clk;
}
if (fep->wol_flag & FEC_WOL_FLAG_ENABLE) {
- if (pdata && pdata->sleep_mode_enable)
- pdata->sleep_mode_enable(false);
+ fec_enet_stop_mode(fep, false);
+
val = readl(fep->hwp + FEC_ECNTRL);
val &= ~(FEC_ECR_MAGICEN | FEC_ECR_SLEEP);
writel(val, fep->hwp + FEC_ECNTRL);
--
1.9.1
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