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Subject[PATCH 09/21] net: thunderx: Add QSGMII interface type support
Date
From: Sunil Goutham <sgoutham@cavium.com>

This patch adds support for QSGMII interface type to
the BGX driver. This type of interface is supported by
81xx SOC.

Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
---
drivers/net/ethernet/cavium/thunder/thunder_bgx.c | 65 ++++++++++++++++++-----
drivers/net/ethernet/cavium/thunder/thunder_bgx.h | 1 +
2 files changed, 54 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
index 9c3c273..0bf8d24 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -379,8 +379,9 @@ void bgx_lmac_internal_loopback(int node, int bgx_idx,
}
EXPORT_SYMBOL(bgx_lmac_internal_loopback);

-static int bgx_lmac_sgmii_init(struct bgx *bgx, int lmacid)
+static int bgx_lmac_sgmii_init(struct bgx *bgx, struct lmac *lmac)
{
+ int lmacid = lmac->lmacid;
u64 cfg;

bgx_reg_modify(bgx, lmacid, BGX_GMP_GMI_TXX_THRESH, 0x30);
@@ -409,6 +410,14 @@ static int bgx_lmac_sgmii_init(struct bgx *bgx, int lmacid)
cfg |= (PCS_MRX_CTL_RST_AN | PCS_MRX_CTL_AN_EN);
bgx_reg_write(bgx, lmacid, BGX_GMP_PCS_MRX_CTL, cfg);

+ if (lmac->lmac_type == BGX_MODE_QSGMII) {
+ /* Disable disparity check for QSGMII */
+ cfg = bgx_reg_read(bgx, lmacid, BGX_GMP_PCS_MISCX_CTL);
+ cfg &= ~PCS_MISC_CTL_DISP_EN;
+ bgx_reg_write(bgx, lmacid, BGX_GMP_PCS_MISCX_CTL, cfg);
+ return 0;
+ }
+
if (bgx_poll_reg(bgx, lmacid, BGX_GMP_PCS_MRX_STATUS,
PCS_MRX_STATUS_AN_CPT, false)) {
dev_err(&bgx->pdev->dev, "BGX AN_CPT not completed\n");
@@ -650,6 +659,14 @@ static void bgx_poll_for_link(struct work_struct *work)
queue_delayed_work(lmac->check_link, &lmac->dwork, HZ * 2);
}

+static int phy_interface_mode(u8 lmac_type)
+{
+ if (lmac_type == BGX_MODE_QSGMII)
+ return PHY_INTERFACE_MODE_QSGMII;
+
+ return PHY_INTERFACE_MODE_SGMII;
+}
+
static int bgx_lmac_enable(struct bgx *bgx, u8 lmacid)
{
struct lmac *lmac;
@@ -658,9 +675,10 @@ static int bgx_lmac_enable(struct bgx *bgx, u8 lmacid)
lmac = &bgx->lmac[lmacid];
lmac->bgx = bgx;

- if (lmac->lmac_type == BGX_MODE_SGMII) {
+ if ((lmac->lmac_type == BGX_MODE_SGMII) ||
+ (lmac->lmac_type == BGX_MODE_QSGMII)) {
lmac->is_sgmii = 1;
- if (bgx_lmac_sgmii_init(bgx, lmacid))
+ if (bgx_lmac_sgmii_init(bgx, lmac))
return -1;
} else {
lmac->is_sgmii = 0;
@@ -697,7 +715,7 @@ static int bgx_lmac_enable(struct bgx *bgx, u8 lmacid)

if (phy_connect_direct(&lmac->netdev, lmac->phydev,
bgx_lmac_handler,
- PHY_INTERFACE_MODE_SGMII))
+ phy_interface_mode(lmac->lmac_type)))
return -ENODEV;

phy_start_aneg(lmac->phydev);
@@ -799,6 +817,11 @@ static void bgx_init_hw(struct bgx *bgx)
bgx_reg_write(bgx, 0, BGX_CMR_RX_STREERING + (i * 8), 0x00);
}

+static u8 bgx_get_lane2sds_cfg(struct bgx *bgx, struct lmac *lmac)
+{
+ return (u8)(bgx_reg_read(bgx, lmac->lmacid, BGX_CMRX_CFG) & 0xFF);
+}
+
static void bgx_print_qlm_mode(struct bgx *bgx, u8 lmacid)
{
struct device *dev = &bgx->pdev->dev;
@@ -838,12 +861,22 @@ static void bgx_print_qlm_mode(struct bgx *bgx, u8 lmacid)
else
dev_info(dev, "%s: 40G_KR4\n", (char *)str);
break;
- default:
- dev_info(dev, "%s: INVALID\n", (char *)str);
+ case BGX_MODE_QSGMII:
+ if ((lmacid == 0) &&
+ (bgx_get_lane2sds_cfg(bgx, lmac) != lmacid))
+ return;
+ if ((lmacid == 2) &&
+ (bgx_get_lane2sds_cfg(bgx, lmac) == lmacid))
+ return;
+ dev_info(dev, "%s: QSGMII\n", (char *)str);
+ break;
+ case BGX_MODE_INVALID:
+ /* Nothing to do */
+ break;
}
}

-static void lmac_set_lane2sds(struct lmac *lmac)
+static void lmac_set_lane2sds(struct bgx *bgx, struct lmac *lmac)
{
switch (lmac->lmac_type) {
case BGX_MODE_SGMII:
@@ -857,6 +890,14 @@ static void lmac_set_lane2sds(struct lmac *lmac)
case BGX_MODE_RXAUI:
lmac->lane_to_sds = (lmac->lmacid) ? 0xE : 0x4;
break;
+ case BGX_MODE_QSGMII:
+ /* There is no way to determine if DLM0/2 is QSGMII or
+ * DLM1/3 is configured to QSGMII as bootloader will
+ * configure all LMACs, so take whatever is configured
+ * by low level firmware.
+ */
+ lmac->lane_to_sds = bgx_get_lane2sds_cfg(bgx, lmac);
+ break;
default:
lmac->lane_to_sds = 0;
break;
@@ -882,7 +923,7 @@ static void bgx_set_lmac_config(struct bgx *bgx, u8 idx)
lmac->use_training =
bgx_reg_read(bgx, 0, BGX_SPUX_BR_PMD_CRTL) &
SPU_PMD_CRTL_TRAIN_EN;
- lmac_set_lane2sds(lmac);
+ lmac_set_lane2sds(bgx, lmac);
return;
}

@@ -901,7 +942,7 @@ static void bgx_set_lmac_config(struct bgx *bgx, u8 idx)
lmac->use_training =
bgx_reg_read(bgx, idx, BGX_SPUX_BR_PMD_CRTL) &
SPU_PMD_CRTL_TRAIN_EN;
- lmac_set_lane2sds(lmac);
+ lmac_set_lane2sds(bgx, lmac);

/* Set LMAC type of other lmac on same DLM i.e LMAC 1/3 */
olmac = &bgx->lmac[idx + 1];
@@ -909,7 +950,7 @@ static void bgx_set_lmac_config(struct bgx *bgx, u8 idx)
olmac->use_training =
bgx_reg_read(bgx, idx + 1, BGX_SPUX_BR_PMD_CRTL) &
SPU_PMD_CRTL_TRAIN_EN;
- lmac_set_lane2sds(olmac);
+ lmac_set_lane2sds(bgx, olmac);
}
}

@@ -920,7 +961,7 @@ static bool is_dlm0_in_bgx_mode(struct bgx *bgx)
if (!bgx->is_81xx)
return true;

- lmac = &bgx->lmac[1];
+ lmac = &bgx->lmac[0];
if (lmac->lmac_type == BGX_MODE_INVALID)
return false;

@@ -946,7 +987,7 @@ static void bgx_get_qlm_mode(struct bgx *bgx)
if (bgx->lmac_count > MAX_LMAC_PER_BGX)
bgx->lmac_count = MAX_LMAC_PER_BGX;

- for (idx = 0; idx < bgx->lmac_count; idx++)
+ for (idx = 0; idx < MAX_LMAC_PER_BGX; idx++)
bgx_set_lmac_config(bgx, idx);

if (!bgx->is_81xx) {
diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
index 38e9fb4..0705863 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
@@ -146,6 +146,7 @@
#define BGX_GMP_PCS_ANX_AN_RESULTS 0x30020
#define BGX_GMP_PCS_SGM_AN_ADV 0x30068
#define BGX_GMP_PCS_MISCX_CTL 0x30078
+#define PCS_MISC_CTL_DISP_EN BIT_ULL(13)
#define PCS_MISC_CTL_GMX_ENO BIT_ULL(11)
#define PCS_MISC_CTL_SAMP_PT_MASK 0x7Full
#define BGX_GMP_GMI_PRTX_CFG 0x38020
--
2.7.4
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