From: Martin Fuzzey martin.fuzzey@flowbird.group
[ Upstream commit da722186f6549d752ea5b5fbc18111833c81a133 ]
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 GPR register and adding the offset and bit information to the driver.
[1] https://www.spinics.net/lists/netdev/msg310922.html
Signed-off-by: Martin Fuzzey martin.fuzzey@flowbird.group Signed-off-by: Fugang Duan fugang.duan@nxp.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/freescale/fec.h | 7 + drivers/net/ethernet/freescale/fec_main.c | 149 +++++++++++++++++----- 2 files changed, 127 insertions(+), 29 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h index f79e57f735b39..d89568f810bc4 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 23c5fef2f1ad1..869efbb6c4d0b 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> @@ -84,6 +86,56 @@ static void fec_enet_itr_coal_init(struct net_device *ndev); #define FEC_ENET_OPD_V 0xFFF0 #define FEC_MDIO_PM_TIMEOUT 100 /* ms */
+struct fec_devinfo { + u32 quirks; + u8 stop_gpr_reg; + u8 stop_gpr_bit; +}; + +static const struct fec_devinfo fec_imx25_info = { + .quirks = FEC_QUIRK_USE_GASKET | FEC_QUIRK_MIB_CLEAR | + FEC_QUIRK_HAS_FRREG, +}; + +static const struct fec_devinfo fec_imx27_info = { + .quirks = FEC_QUIRK_MIB_CLEAR | FEC_QUIRK_HAS_FRREG, +}; + +static const struct fec_devinfo fec_imx28_info = { + .quirks = FEC_QUIRK_ENET_MAC | FEC_QUIRK_SWAP_FRAME | + FEC_QUIRK_SINGLE_MDIO | FEC_QUIRK_HAS_RACC | + FEC_QUIRK_HAS_FRREG, +}; + +static const struct fec_devinfo fec_imx6q_info = { + .quirks = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT | + FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM | + FEC_QUIRK_HAS_VLAN | FEC_QUIRK_ERR006358 | + FEC_QUIRK_HAS_RACC, + .stop_gpr_reg = 0x34, + .stop_gpr_bit = 27, +}; + +static const struct fec_devinfo fec_mvf600_info = { + .quirks = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_RACC, +}; + +static const struct fec_devinfo fec_imx6x_info = { + .quirks = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT | + FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM | + FEC_QUIRK_HAS_VLAN | FEC_QUIRK_HAS_AVB | + FEC_QUIRK_ERR007885 | FEC_QUIRK_BUG_CAPTURE | + FEC_QUIRK_HAS_RACC | FEC_QUIRK_HAS_COALESCE, +}; + +static const struct fec_devinfo fec_imx6ul_info = { + .quirks = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT | + FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM | + FEC_QUIRK_HAS_VLAN | FEC_QUIRK_ERR007885 | + FEC_QUIRK_BUG_CAPTURE | FEC_QUIRK_HAS_RACC | + FEC_QUIRK_HAS_COALESCE, +}; + static struct platform_device_id fec_devtype[] = { { /* keep it for coldfire */ @@ -91,39 +143,25 @@ static struct platform_device_id fec_devtype[] = { .driver_data = 0, }, { .name = "imx25-fec", - .driver_data = FEC_QUIRK_USE_GASKET | FEC_QUIRK_MIB_CLEAR | - FEC_QUIRK_HAS_FRREG, + .driver_data = (kernel_ulong_t)&fec_imx25_info, }, { .name = "imx27-fec", - .driver_data = FEC_QUIRK_MIB_CLEAR | FEC_QUIRK_HAS_FRREG, + .driver_data = (kernel_ulong_t)&fec_imx27_info, }, { .name = "imx28-fec", - .driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_SWAP_FRAME | - FEC_QUIRK_SINGLE_MDIO | FEC_QUIRK_HAS_RACC | - FEC_QUIRK_HAS_FRREG, + .driver_data = (kernel_ulong_t)&fec_imx28_info, }, { .name = "imx6q-fec", - .driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT | - FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM | - FEC_QUIRK_HAS_VLAN | FEC_QUIRK_ERR006358 | - FEC_QUIRK_HAS_RACC, + .driver_data = (kernel_ulong_t)&fec_imx6q_info, }, { .name = "mvf600-fec", - .driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_RACC, + .driver_data = (kernel_ulong_t)&fec_mvf600_info, }, { .name = "imx6sx-fec", - .driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT | - FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM | - FEC_QUIRK_HAS_VLAN | FEC_QUIRK_HAS_AVB | - FEC_QUIRK_ERR007885 | FEC_QUIRK_BUG_CAPTURE | - FEC_QUIRK_HAS_RACC | FEC_QUIRK_HAS_COALESCE, + .driver_data = (kernel_ulong_t)&fec_imx6x_info, }, { .name = "imx6ul-fec", - .driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT | - FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM | - FEC_QUIRK_HAS_VLAN | FEC_QUIRK_ERR007885 | - FEC_QUIRK_BUG_CAPTURE | FEC_QUIRK_HAS_RACC | - FEC_QUIRK_HAS_COALESCE, + .driver_data = (kernel_ulong_t)&fec_imx6ul_info, }, { /* sentinel */ } @@ -1092,11 +1130,28 @@ fec_restart(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 +1180,7 @@ fec_stop(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 +3450,37 @@ static int fec_enet_get_irq_cnt(struct platform_device *pdev) return irq_cnt; }
+static int fec_enet_init_stop_mode(struct fec_enet_private *fep, + struct fec_devinfo *dev_info, + struct device_node *np) +{ + struct device_node *gpr_np; + int ret = 0; + + if (!dev_info) + return 0; + + gpr_np = of_parse_phandle(np, "gpr", 0); + if (!gpr_np) + return 0; + + fep->stop_gpr.gpr = syscon_node_to_regmap(gpr_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 = dev_info->stop_gpr_reg; + fep->stop_gpr.bit = dev_info->stop_gpr_bit; + +out: + of_node_put(gpr_np); + + return ret; +} + static int fec_probe(struct platform_device *pdev) { @@ -3412,6 +3496,7 @@ fec_probe(struct platform_device *pdev) int num_rx_qs; char irq_name[8]; int irq_cnt; + struct fec_devinfo *dev_info;
fec_enet_get_queue_num(pdev, &num_tx_qs, &num_rx_qs);
@@ -3429,7 +3514,9 @@ fec_probe(struct platform_device *pdev) of_id = of_match_device(fec_dt_ids, &pdev->dev); if (of_id) pdev->id_entry = of_id->data; - fep->quirks = pdev->id_entry->driver_data; + dev_info = (struct fec_devinfo *)pdev->id_entry->driver_data; + if (dev_info) + fep->quirks = dev_info->quirks;
fep->netdev = ndev; fep->num_rx_queues = num_rx_qs; @@ -3463,6 +3550,10 @@ fec_probe(struct platform_device *pdev) if (of_get_property(np, "fsl,magic-packet", NULL)) fep->wol_flag |= FEC_WOL_HAS_MAGIC_PACKET;
+ ret = fec_enet_init_stop_mode(fep, dev_info, 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 +3722,7 @@ failed_clk: 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 +3800,6 @@ 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 +3817,8 @@ 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);