sfc: Add support for QT2025C PHY

This is a new PHY supporting SFP+ modules, used in the SFN4112F
reference design.  It is similar to the QT2022C2 and shares much of
its support code.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 91 insertions, 10 deletions

diff --git a/drivers/net/sfc/falcon.c b/drivers/net/sfc/falcon.c
index d5378e60fcdd..9e2f0f0d47a8 100644
--- a/drivers/net/sfc/falcon.c
+++ b/drivers/net/sfc/falcon.c
@@ -2249,6 +2249,7 @@ static int falcon_probe_phy(struct efx_nic *efx)
                 efx->phy_op = &falcon_sft9001_phy_ops;
                 break;
         case PHY_TYPE_QT2022C2:
+        case PHY_TYPE_QT2025C:
                 efx->phy_op = &falcon_xfp_phy_ops;
                 break;
         default:
diff --git a/drivers/net/sfc/net_driver.h b/drivers/net/sfc/net_driver.h
index 19930ff9df7b..eb768fcb3cc8 100644
--- a/drivers/net/sfc/net_driver.h
+++ b/drivers/net/sfc/net_driver.h
@@ -450,6 +450,7 @@ enum phy_type {
         PHY_TYPE_QT2022C2 = 4,
         PHY_TYPE_PM8358 = 6,
         PHY_TYPE_SFT9001A = 8,
+        PHY_TYPE_QT2025C = 9,
         PHY_TYPE_SFT9001B = 10,
         PHY_TYPE_MAX    /* Insert any new items before this */
 };
diff --git a/drivers/net/sfc/phy.h b/drivers/net/sfc/phy.h
index f6e47227d245..c1cff9c0c173 100644
--- a/drivers/net/sfc/phy.h
+++ b/drivers/net/sfc/phy.h
@@ -23,11 +23,11 @@ extern void tenxpress_phy_blink(struct efx_nic *efx, bool blink);
 extern int sft9001_wait_boot(struct efx_nic *efx);
 
 /****************************************************************************
- * Exported functions from the driver for XFP optical PHYs
+ * AMCC/Quake QT20xx PHYs
  */
 extern struct efx_phy_operations falcon_xfp_phy_ops;
 
-/* The QUAKE XFP PHY provides various H/W control states for LEDs */
+/* These PHYs provide various H/W control states for LEDs */
 #define QUAKE_LED_LINK_INVAL    (0)
 #define QUAKE_LED_LINK_STAT     (1)
 #define QUAKE_LED_LINK_ACT      (2)
diff --git a/drivers/net/sfc/xfp_phy.c b/drivers/net/sfc/xfp_phy.c
index 2df467d28064..bb1ef77d5f56 100644
--- a/drivers/net/sfc/xfp_phy.c
+++ b/drivers/net/sfc/xfp_phy.c
@@ -7,8 +7,8 @@
  * by the Free Software Foundation, incorporated herein by reference.
  */
 /*
- * Driver for XFP optical PHYs (plus some support specific to the Quake 2022/32)
- * See www.amcc.com for details (search for qt2032)
+ * Driver for SFP+ and XFP optical PHYs plus some support specific to the
+ * AMCC QT20xx adapters; see www.amcc.com for details
  */
 
 #include <linux/timer.h>
@@ -31,6 +31,21 @@
 /* Quake-specific MDIO registers */
 #define MDIO_QUAKE_LED0_REG     (0xD006)
 
+/* QT2025C only */
+#define PCS_FW_HEARTBEAT_REG    0xd7ee
+#define PCS_FW_HEARTB_LBN       0
+#define PCS_FW_HEARTB_WIDTH     8
+#define PCS_UC8051_STATUS_REG   0xd7fd
+#define PCS_UC_STATUS_LBN       0
+#define PCS_UC_STATUS_WIDTH     8
+#define PCS_UC_STATUS_FW_SAVE   0x20
+#define PMA_PMD_FTX_CTRL2_REG   0xc309
+#define PMA_PMD_FTX_STATIC_LBN  13
+#define PMA_PMD_VEND1_REG       0xc001
+#define PMA_PMD_VEND1_LBTXD_LBN 15
+#define PCS_VEND1_REG           0xc000
+#define PCS_VEND1_LBTXD_LBN     5
+
 void xfp_set_led(struct efx_nic *p, int led, int mode)
 {
         int addr = MDIO_QUAKE_LED0_REG + led;
@@ -45,7 +60,49 @@ struct xfp_phy_data {
 #define XFP_MAX_RESET_TIME 500
 #define XFP_RESET_WAIT 10
 
-/* Reset the PHYXS MMD. This is documented (for the Quake PHY) as doing
+static int qt2025c_wait_reset(struct efx_nic *efx)
+{
+        unsigned long timeout = jiffies + 10 * HZ;
+        int phy_id = efx->mii.phy_id;
+        int reg, old_counter = 0;
+
+        /* Wait for firmware heartbeat to start */
+        for (;;) {
+                int counter;
+                reg = mdio_clause45_read(efx, phy_id, MDIO_MMD_PCS,
+                                         PCS_FW_HEARTBEAT_REG);
+                if (reg < 0)
+                        return reg;
+                counter = ((reg >> PCS_FW_HEARTB_LBN) &
+                            ((1 << PCS_FW_HEARTB_WIDTH) - 1));
+                if (old_counter == 0)
+                        old_counter = counter;
+                else if (counter != old_counter)
+                        break;
+                if (time_after(jiffies, timeout))
+                        return -ETIMEDOUT;
+                msleep(10);
+        }
+
+        /* Wait for firmware status to look good */
+        for (;;) {
+                reg = mdio_clause45_read(efx, phy_id, MDIO_MMD_PCS,
+                                         PCS_UC8051_STATUS_REG);
+                if (reg < 0)
+                        return reg;
+                if ((reg &
+                     ((1 << PCS_UC_STATUS_WIDTH) - 1) << PCS_UC_STATUS_LBN) >=
+                    PCS_UC_STATUS_FW_SAVE)
+                        break;
+                if (time_after(jiffies, timeout))
+                        return -ETIMEDOUT;
+                msleep(100);
+        }
+
+        return 0;
+}
+
+/* Reset the PHYXS MMD. This is documented (for the Quake PHYs) as doing
  * a complete soft reset.
  */
 static int xfp_reset_phy(struct efx_nic *efx)
@@ -58,6 +115,12 @@ static int xfp_reset_phy(struct efx_nic *efx)
         if (rc < 0)
                 goto fail;
 
+        if (efx->phy_type == PHY_TYPE_QT2025C) {
+                rc = qt2025c_wait_reset(efx);
+                if (rc < 0)
+                        goto fail;
+        }
+
         /* Wait 250ms for the PHY to complete bootup */
         msleep(250);
 
@@ -131,12 +194,28 @@ static void xfp_phy_reconfigure(struct efx_nic *efx)
 {
         struct xfp_phy_data *phy_data = efx->phy_data;
 
-        /* Reset the PHY when moving from tx off to tx on */
-        if (!(efx->phy_mode & PHY_MODE_TX_DISABLED) &&
-            (phy_data->phy_mode & PHY_MODE_TX_DISABLED))
-                xfp_reset_phy(efx);
+        if (efx->phy_type == PHY_TYPE_QT2025C) {
+                /* There are several different register bits which can
+                 * disable TX (and save power) on direct-attach cables
+                 * or optical transceivers, varying somewhat between
+                 * firmware versions.  Only 'static mode' appears to
+                 * cover everything. */
+                mdio_clause45_set_flag(
+                        efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
+                        PMA_PMD_FTX_CTRL2_REG, PMA_PMD_FTX_STATIC_LBN,
+                        efx->phy_mode & PHY_MODE_TX_DISABLED ||
+                        efx->phy_mode & PHY_MODE_LOW_POWER ||
+                        efx->loopback_mode == LOOPBACK_PCS ||
+                        efx->loopback_mode == LOOPBACK_PMAPMD);
+        } else {
+                /* Reset the PHY when moving from tx off to tx on */
+                if (!(efx->phy_mode & PHY_MODE_TX_DISABLED) &&
+                    (phy_data->phy_mode & PHY_MODE_TX_DISABLED))
+                        xfp_reset_phy(efx);
+
+                mdio_clause45_transmit_disable(efx);
+        }
 
-        mdio_clause45_transmit_disable(efx);
         mdio_clause45_phy_reconfigure(efx);
 
         phy_data->phy_mode = efx->phy_mode;