From e37425c23afd34fb73d329d2ca7b31ae1e6f2be5 Mon Sep 17 00:00:00 2001 From: Florinel Iordache Date: Thu, 10 Aug 2017 16:47:04 +0300 Subject: [PATCH] fsl/fman: implement several errata workarounds Implemented workarounds for the following dTSEC Erratum: A002, A004, A0012, A0014, A004839 on several operations that involve MAC CFG register changes: adjust link, rx pause frames, modify MAC address. Signed-off-by: Florinel Iordache Acked-by: Madalin Bucur Signed-off-by: David S. Miller --- .../net/ethernet/freescale/fman/fman_dtsec.c | 118 ++++++++++++++---- 1 file changed, 93 insertions(+), 25 deletions(-) diff --git a/drivers/net/ethernet/freescale/fman/fman_dtsec.c b/drivers/net/ethernet/freescale/fman/fman_dtsec.c index 98bba10fc38c..ea43b4974149 100644 --- a/drivers/net/ethernet/freescale/fman/fman_dtsec.c +++ b/drivers/net/ethernet/freescale/fman/fman_dtsec.c @@ -123,7 +123,7 @@ #define DTSEC_ECNTRL_R100M 0x00000008 #define DTSEC_ECNTRL_QSGMIIM 0x00000001 -#define DTSEC_TCTRL_GTS 0x00000020 +#define TCTRL_GTS 0x00000020 #define RCTRL_PAL_MASK 0x001f0000 #define RCTRL_PAL_SHIFT 16 @@ -863,6 +863,52 @@ int dtsec_cfg_pad_and_crc(struct fman_mac *dtsec, bool new_val) return 0; } +static void graceful_start(struct fman_mac *dtsec, enum comm_mode mode) +{ + struct dtsec_regs __iomem *regs = dtsec->regs; + + if (mode & COMM_MODE_TX) + iowrite32be(ioread32be(®s->tctrl) & + ~TCTRL_GTS, ®s->tctrl); + if (mode & COMM_MODE_RX) + iowrite32be(ioread32be(®s->rctrl) & + ~RCTRL_GRS, ®s->rctrl); +} + +static void graceful_stop(struct fman_mac *dtsec, enum comm_mode mode) +{ + struct dtsec_regs __iomem *regs = dtsec->regs; + u32 tmp; + + /* Graceful stop - Assert the graceful Rx stop bit */ + if (mode & COMM_MODE_RX) { + tmp = ioread32be(®s->rctrl) | RCTRL_GRS; + iowrite32be(tmp, ®s->rctrl); + + if (dtsec->fm_rev_info.major == 2) { + /* Workaround for dTSEC Errata A002 */ + usleep_range(100, 200); + } else { + /* Workaround for dTSEC Errata A004839 */ + usleep_range(10, 50); + } + } + + /* Graceful stop - Assert the graceful Tx stop bit */ + if (mode & COMM_MODE_TX) { + if (dtsec->fm_rev_info.major == 2) { + /* dTSEC Errata A004: Do not use TCTRL[GTS]=1 */ + pr_debug("GTS not supported due to DTSEC_A004 Errata.\n"); + } else { + tmp = ioread32be(®s->tctrl) | TCTRL_GTS; + iowrite32be(tmp, ®s->tctrl); + + /* Workaround for dTSEC Errata A0012, A0014 */ + usleep_range(10, 50); + } + } +} + int dtsec_enable(struct fman_mac *dtsec, enum comm_mode mode) { struct dtsec_regs __iomem *regs = dtsec->regs; @@ -880,13 +926,8 @@ int dtsec_enable(struct fman_mac *dtsec, enum comm_mode mode) iowrite32be(tmp, ®s->maccfg1); - /* Graceful start - clear the graceful receive stop bit */ - if (mode & COMM_MODE_TX) - iowrite32be(ioread32be(®s->tctrl) & ~DTSEC_TCTRL_GTS, - ®s->tctrl); - if (mode & COMM_MODE_RX) - iowrite32be(ioread32be(®s->rctrl) & ~RCTRL_GRS, - ®s->rctrl); + /* Graceful start - clear the graceful Rx/Tx stop bit */ + graceful_start(dtsec, mode); return 0; } @@ -899,23 +940,8 @@ int dtsec_disable(struct fman_mac *dtsec, enum comm_mode mode) if (!is_init_done(dtsec->dtsec_drv_param)) return -EINVAL; - /* Gracefull stop - Assert the graceful transmit stop bit */ - if (mode & COMM_MODE_RX) { - tmp = ioread32be(®s->rctrl) | RCTRL_GRS; - iowrite32be(tmp, ®s->rctrl); - - if (dtsec->fm_rev_info.major == 2) - usleep_range(100, 200); - else - udelay(10); - } - - if (mode & COMM_MODE_TX) { - if (dtsec->fm_rev_info.major == 2) - pr_debug("GTS not supported due to DTSEC_A004 errata.\n"); - else - pr_debug("GTS not supported due to DTSEC_A0014 errata.\n"); - } + /* Graceful stop - Assert the graceful Rx/Tx stop bit */ + graceful_stop(dtsec, mode); tmp = ioread32be(®s->maccfg1); if (mode & COMM_MODE_RX) @@ -933,11 +959,19 @@ int dtsec_set_tx_pause_frames(struct fman_mac *dtsec, u16 pause_time, u16 __maybe_unused thresh_time) { struct dtsec_regs __iomem *regs = dtsec->regs; + enum comm_mode mode = COMM_MODE_NONE; u32 ptv = 0; if (!is_init_done(dtsec->dtsec_drv_param)) return -EINVAL; + if ((ioread32be(®s->rctrl) & RCTRL_GRS) == 0) + mode |= COMM_MODE_RX; + if ((ioread32be(®s->tctrl) & TCTRL_GTS) == 0) + mode |= COMM_MODE_TX; + + graceful_stop(dtsec, mode); + if (pause_time) { /* FM_BAD_TX_TS_IN_B_2_B_ERRATA_DTSEC_A003 Errata workaround */ if (dtsec->fm_rev_info.major == 2 && pause_time <= 320) { @@ -958,17 +992,27 @@ int dtsec_set_tx_pause_frames(struct fman_mac *dtsec, iowrite32be(ioread32be(®s->maccfg1) & ~MACCFG1_TX_FLOW, ®s->maccfg1); + graceful_start(dtsec, mode); + return 0; } int dtsec_accept_rx_pause_frames(struct fman_mac *dtsec, bool en) { struct dtsec_regs __iomem *regs = dtsec->regs; + enum comm_mode mode = COMM_MODE_NONE; u32 tmp; if (!is_init_done(dtsec->dtsec_drv_param)) return -EINVAL; + if ((ioread32be(®s->rctrl) & RCTRL_GRS) == 0) + mode |= COMM_MODE_RX; + if ((ioread32be(®s->tctrl) & TCTRL_GTS) == 0) + mode |= COMM_MODE_TX; + + graceful_stop(dtsec, mode); + tmp = ioread32be(®s->maccfg1); if (en) tmp |= MACCFG1_RX_FLOW; @@ -976,20 +1020,34 @@ int dtsec_accept_rx_pause_frames(struct fman_mac *dtsec, bool en) tmp &= ~MACCFG1_RX_FLOW; iowrite32be(tmp, ®s->maccfg1); + graceful_start(dtsec, mode); + return 0; } int dtsec_modify_mac_address(struct fman_mac *dtsec, enet_addr_t *enet_addr) { + struct dtsec_regs __iomem *regs = dtsec->regs; + enum comm_mode mode = COMM_MODE_NONE; + if (!is_init_done(dtsec->dtsec_drv_param)) return -EINVAL; + if ((ioread32be(®s->rctrl) & RCTRL_GRS) == 0) + mode |= COMM_MODE_RX; + if ((ioread32be(®s->tctrl) & TCTRL_GTS) == 0) + mode |= COMM_MODE_TX; + + graceful_stop(dtsec, mode); + /* Initialize MAC Station Address registers (1 & 2) * Station address have to be swapped (big endian to little endian */ dtsec->addr = ENET_ADDR_TO_UINT64(*enet_addr); set_mac_address(dtsec->regs, (u8 *)(*enet_addr)); + graceful_start(dtsec, mode); + return 0; } @@ -1162,11 +1220,19 @@ int dtsec_set_promiscuous(struct fman_mac *dtsec, bool new_val) int dtsec_adjust_link(struct fman_mac *dtsec, u16 speed) { struct dtsec_regs __iomem *regs = dtsec->regs; + enum comm_mode mode = COMM_MODE_NONE; u32 tmp; if (!is_init_done(dtsec->dtsec_drv_param)) return -EINVAL; + if ((ioread32be(®s->rctrl) & RCTRL_GRS) == 0) + mode |= COMM_MODE_RX; + if ((ioread32be(®s->tctrl) & TCTRL_GTS) == 0) + mode |= COMM_MODE_TX; + + graceful_stop(dtsec, mode); + tmp = ioread32be(®s->maccfg2); /* Full Duplex */ @@ -1186,6 +1252,8 @@ int dtsec_adjust_link(struct fman_mac *dtsec, u16 speed) tmp &= ~DTSEC_ECNTRL_R100M; iowrite32be(tmp, ®s->ecntrl); + graceful_start(dtsec, mode); + return 0; } -- 2.30.2