From: Lorenzo Bianconi Date: Sat, 14 Jan 2023 18:01:30 +0100 Subject: [PATCH] net: ethernet: mtk_eth_soc: align reset procedure to vendor sdk Avoid to power-down the ethernet chip during hw reset and align reset procedure to vendor sdk. Reviewed-by: Leon Romanovsky Tested-by: Daniel Golle Co-developed-by: Sujuan Chen Signed-off-by: Sujuan Chen Signed-off-by: Lorenzo Bianconi Signed-off-by: Paolo Abeni --- --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -2788,14 +2788,29 @@ static void mtk_dma_free(struct mtk_eth kfree(eth->scratch_head); } +static bool mtk_hw_reset_check(struct mtk_eth *eth) +{ + u32 val = mtk_r32(eth, MTK_INT_STATUS2); + + return (val & MTK_FE_INT_FQ_EMPTY) || (val & MTK_FE_INT_RFIFO_UF) || + (val & MTK_FE_INT_RFIFO_OV) || (val & MTK_FE_INT_TSO_FAIL) || + (val & MTK_FE_INT_TSO_ALIGN) || (val & MTK_FE_INT_TSO_ILLEGAL); +} + static void mtk_tx_timeout(struct net_device *dev, unsigned int txqueue) { struct mtk_mac *mac = netdev_priv(dev); struct mtk_eth *eth = mac->hw; + if (test_bit(MTK_RESETTING, ð->state)) + return; + + if (!mtk_hw_reset_check(eth)) + return; + eth->netdev[mac->id]->stats.tx_errors++; - netif_err(eth, tx_err, dev, - "transmit timed out\n"); + netif_err(eth, tx_err, dev, "transmit timed out\n"); + schedule_work(ð->pending_work); } @@ -3277,15 +3292,17 @@ static int mtk_hw_init(struct mtk_eth *e const struct mtk_reg_map *reg_map = eth->soc->reg_map; int i, val, ret; - if (test_and_set_bit(MTK_HW_INIT, ð->state)) + if (!reset && test_and_set_bit(MTK_HW_INIT, ð->state)) return 0; - pm_runtime_enable(eth->dev); - pm_runtime_get_sync(eth->dev); + if (!reset) { + pm_runtime_enable(eth->dev); + pm_runtime_get_sync(eth->dev); - ret = mtk_clk_enable(eth); - if (ret) - goto err_disable_pm; + ret = mtk_clk_enable(eth); + if (ret) + goto err_disable_pm; + } if (eth->ethsys) regmap_update_bits(eth->ethsys, ETHSYS_DMA_AG_MAP, dma_mask, @@ -3411,8 +3428,10 @@ static int mtk_hw_init(struct mtk_eth *e return 0; err_disable_pm: - pm_runtime_put_sync(eth->dev); - pm_runtime_disable(eth->dev); + if (!reset) { + pm_runtime_put_sync(eth->dev); + pm_runtime_disable(eth->dev); + } return ret; } @@ -3474,30 +3493,53 @@ static int mtk_do_ioctl(struct net_devic return -EOPNOTSUPP; } +static void mtk_prepare_for_reset(struct mtk_eth *eth) +{ + u32 val; + int i; + + /* disabe FE P3 and P4 */ + val = mtk_r32(eth, MTK_FE_GLO_CFG) | MTK_FE_LINK_DOWN_P3; + if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1)) + val |= MTK_FE_LINK_DOWN_P4; + mtk_w32(eth, val, MTK_FE_GLO_CFG); + + /* adjust PPE configurations to prepare for reset */ + for (i = 0; i < ARRAY_SIZE(eth->ppe); i++) + mtk_ppe_prepare_reset(eth->ppe[i]); + + /* disable NETSYS interrupts */ + mtk_w32(eth, 0, MTK_FE_INT_ENABLE); + + /* force link down GMAC */ + for (i = 0; i < 2; i++) { + val = mtk_r32(eth, MTK_MAC_MCR(i)) & ~MAC_MCR_FORCE_LINK; + mtk_w32(eth, val, MTK_MAC_MCR(i)); + } +} + static void mtk_pending_work(struct work_struct *work) { struct mtk_eth *eth = container_of(work, struct mtk_eth, pending_work); - int err, i; unsigned long restart = 0; + u32 val; + int i; rtnl_lock(); - - dev_dbg(eth->dev, "[%s][%d] reset\n", __func__, __LINE__); set_bit(MTK_RESETTING, ð->state); + mtk_prepare_for_reset(eth); + /* stop all devices to make sure that dma is properly shut down */ for (i = 0; i < MTK_MAC_COUNT; i++) { - if (!eth->netdev[i]) + if (!eth->netdev[i] || !netif_running(eth->netdev[i])) continue; + mtk_stop(eth->netdev[i]); __set_bit(i, &restart); } - dev_dbg(eth->dev, "[%s][%d] mtk_stop ends\n", __func__, __LINE__); - /* restart underlying hardware such as power, clock, pin mux - * and the connected phy - */ - mtk_hw_deinit(eth); + usleep_range(15000, 16000); if (eth->dev->pins) pinctrl_select_state(eth->dev->pins->p, @@ -3508,15 +3550,19 @@ static void mtk_pending_work(struct work for (i = 0; i < MTK_MAC_COUNT; i++) { if (!test_bit(i, &restart)) continue; - err = mtk_open(eth->netdev[i]); - if (err) { + + if (mtk_open(eth->netdev[i])) { netif_alert(eth, ifup, eth->netdev[i], - "Driver up/down cycle failed, closing device.\n"); + "Driver up/down cycle failed\n"); dev_close(eth->netdev[i]); } } - dev_dbg(eth->dev, "[%s][%d] reset done\n", __func__, __LINE__); + /* enabe FE P3 and P4 */ + val = mtk_r32(eth, MTK_FE_GLO_CFG) & ~MTK_FE_LINK_DOWN_P3; + if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1)) + val &= ~MTK_FE_LINK_DOWN_P4; + mtk_w32(eth, val, MTK_FE_GLO_CFG); clear_bit(MTK_RESETTING, ð->state); --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h @@ -72,12 +72,24 @@ #define MTK_HW_LRO_REPLACE_DELTA 1000 #define MTK_HW_LRO_SDL_REMAIN_ROOM 1522 +/* Frame Engine Global Configuration */ +#define MTK_FE_GLO_CFG 0x00 +#define MTK_FE_LINK_DOWN_P3 BIT(11) +#define MTK_FE_LINK_DOWN_P4 BIT(12) + /* Frame Engine Global Reset Register */ #define MTK_RST_GL 0x04 #define RST_GL_PSE BIT(0) /* Frame Engine Interrupt Status Register */ #define MTK_INT_STATUS2 0x08 +#define MTK_FE_INT_ENABLE 0x0c +#define MTK_FE_INT_FQ_EMPTY BIT(8) +#define MTK_FE_INT_TSO_FAIL BIT(12) +#define MTK_FE_INT_TSO_ILLEGAL BIT(13) +#define MTK_FE_INT_TSO_ALIGN BIT(14) +#define MTK_FE_INT_RFIFO_OV BIT(18) +#define MTK_FE_INT_RFIFO_UF BIT(19) #define MTK_GDM1_AF BIT(28) #define MTK_GDM2_AF BIT(29) --- a/drivers/net/ethernet/mediatek/mtk_ppe.c +++ b/drivers/net/ethernet/mediatek/mtk_ppe.c @@ -716,6 +716,33 @@ int mtk_foe_entry_idle_time(struct mtk_p return __mtk_foe_entry_idle_time(ppe, entry->data.ib1); } +int mtk_ppe_prepare_reset(struct mtk_ppe *ppe) +{ + if (!ppe) + return -EINVAL; + + /* disable KA */ + ppe_clear(ppe, MTK_PPE_TB_CFG, MTK_PPE_TB_CFG_KEEPALIVE); + ppe_clear(ppe, MTK_PPE_BIND_LMT1, MTK_PPE_NTU_KEEPALIVE); + ppe_w32(ppe, MTK_PPE_KEEPALIVE, 0); + usleep_range(10000, 11000); + + /* set KA timer to maximum */ + ppe_set(ppe, MTK_PPE_BIND_LMT1, MTK_PPE_NTU_KEEPALIVE); + ppe_w32(ppe, MTK_PPE_KEEPALIVE, 0xffffffff); + + /* set KA tick select */ + ppe_set(ppe, MTK_PPE_TB_CFG, MTK_PPE_TB_TICK_SEL); + ppe_set(ppe, MTK_PPE_TB_CFG, MTK_PPE_TB_CFG_KEEPALIVE); + usleep_range(10000, 11000); + + /* disable scan mode */ + ppe_clear(ppe, MTK_PPE_TB_CFG, MTK_PPE_TB_CFG_SCAN_MODE); + usleep_range(10000, 11000); + + return mtk_ppe_wait_busy(ppe); +} + struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base, int version, int index) { --- a/drivers/net/ethernet/mediatek/mtk_ppe.h +++ b/drivers/net/ethernet/mediatek/mtk_ppe.h @@ -307,6 +307,7 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_ void mtk_ppe_deinit(struct mtk_eth *eth); void mtk_ppe_start(struct mtk_ppe *ppe); int mtk_ppe_stop(struct mtk_ppe *ppe); +int mtk_ppe_prepare_reset(struct mtk_ppe *ppe); void __mtk_ppe_check_skb(struct mtk_ppe *ppe, struct sk_buff *skb, u16 hash); --- a/drivers/net/ethernet/mediatek/mtk_ppe_regs.h +++ b/drivers/net/ethernet/mediatek/mtk_ppe_regs.h @@ -58,6 +58,12 @@ #define MTK_PPE_TB_CFG_SCAN_MODE GENMASK(17, 16) #define MTK_PPE_TB_CFG_HASH_DEBUG GENMASK(19, 18) #define MTK_PPE_TB_CFG_INFO_SEL BIT(20) +#define MTK_PPE_TB_TICK_SEL BIT(24) + +#define MTK_PPE_BIND_LMT1 0x230 +#define MTK_PPE_NTU_KEEPALIVE GENMASK(23, 16) + +#define MTK_PPE_KEEPALIVE 0x234 enum { MTK_PPE_SCAN_MODE_DISABLED,