[PATCH] S2io: New link handling scheme for Xframe II

Hi,
The below patch implements a new "Link state change handling"
scheme supported by the Xframe II adapter. It also bumps up the
driver version to 2.0.2.0.

Signed-off-by: Ravinandan Arakali <ravinandan.arakali@neterion.com>
Signed-off-by: Raghavendra Koushik <raghavendra.koushik@neterion.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

2 files changed, 121 insertions, 34 deletions

diff --git a/drivers/net/s2io-regs.h b/drivers/net/s2io-regs.h
index 159d87648f64..2234a8f05eb2 100644
--- a/drivers/net/s2io-regs.h
+++ b/drivers/net/s2io-regs.h
@@ -167,7 +167,11 @@ typedef struct _XENA_dev_config {
         u8 unused4[0x08];
 
         u64 gpio_int_reg;
+#define GPIO_INT_REG_LINK_DOWN                 BIT(1)
+#define GPIO_INT_REG_LINK_UP                   BIT(2)
         u64 gpio_int_mask;
+#define GPIO_INT_MASK_LINK_DOWN                BIT(1)
+#define GPIO_INT_MASK_LINK_UP                  BIT(2)
         u64 gpio_alarms;
 
         u8 unused5[0x38];
@@ -279,8 +283,10 @@ typedef struct _XENA_dev_config {
 
         u64 gpio_control;
 #define GPIO_CTRL_GPIO_0                BIT(8)
+        u64 misc_control;
+#define MISC_LINK_STABILITY_PRD(val)   vBIT(val,29,3)
 
-        u8 unused7_1[0x240 - 0x200];
+        u8 unused7_1[0x240 - 0x208];
 
         u64 wreq_split_mask;
 #define WREQ_SPLIT_MASK_SET_MASK(val)   vBIT(val, 52, 12)
diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index f430ffe7d6f8..e7c428561e3f 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -67,7 +67,7 @@
 
 /* S2io Driver name & version. */
 static char s2io_driver_name[] = "Neterion";
-static char s2io_driver_version[] = "Version 1.7.7";
+static char s2io_driver_version[] = "Version 2.0.2.0";
 
 static inline int RXD_IS_UP2DT(RxD_t *rxdp)
 {
@@ -1456,8 +1456,28 @@ static int init_nic(struct s2io_nic *nic)
                 writeq(val64, &bar0->wreq_split_mask);
         }
 
+        /* Setting Link stability period to 64 ms */ 
+        if (nic->device_type == XFRAME_II_DEVICE) {
+                val64 = MISC_LINK_STABILITY_PRD(3);
+                writeq(val64, &bar0->misc_control);
+        }
+
         return SUCCESS;
 }
+#define LINK_UP_DOWN_INTERRUPT          1
+#define MAC_RMAC_ERR_TIMER              2
+
+#if defined(CONFIG_MSI_MODE) || defined(CONFIG_MSIX_MODE)
+#define s2io_link_fault_indication(x) MAC_RMAC_ERR_TIMER
+#else
+int s2io_link_fault_indication(nic_t *nic)
+{
+        if (nic->device_type == XFRAME_II_DEVICE)
+                return LINK_UP_DOWN_INTERRUPT;
+        else
+                return MAC_RMAC_ERR_TIMER;
+}
+#endif
 
 /**
  *  en_dis_able_nic_intrs - Enable or Disable the interrupts
@@ -1485,11 +1505,22 @@ static void en_dis_able_nic_intrs(struct s2io_nic *nic, u16 mask, int flag)
                         temp64 &= ~((u64) val64);
                         writeq(temp64, &bar0->general_int_mask);
                         /*
-                         * Disabled all PCIX, Flash, MDIO, IIC and GPIO
+                         * If Hercules adapter enable GPIO otherwise
+                         * disabled all PCIX, Flash, MDIO, IIC and GPIO
                          * interrupts for now.
                          * TODO
                          */
-                        writeq(DISABLE_ALL_INTRS, &bar0->pic_int_mask);
+                        if (s2io_link_fault_indication(nic) ==
+                                        LINK_UP_DOWN_INTERRUPT ) {
+                                temp64 = readq(&bar0->pic_int_mask);
+                                temp64 &= ~((u64) PIC_INT_GPIO);
+                                writeq(temp64, &bar0->pic_int_mask);
+                                temp64 = readq(&bar0->gpio_int_mask);
+                                temp64 &= ~((u64) GPIO_INT_MASK_LINK_UP);
+                                writeq(temp64, &bar0->gpio_int_mask);
+                        } else {
+                                writeq(DISABLE_ALL_INTRS, &bar0->pic_int_mask);
+                        }
                         /*
                          * No MSI Support is available presently, so TTI and
                          * RTI interrupts are also disabled.
@@ -1580,17 +1611,8 @@ static void en_dis_able_nic_intrs(struct s2io_nic *nic, u16 mask, int flag)
                         writeq(temp64, &bar0->general_int_mask);
                         /*
                          * All MAC block error interrupts are disabled for now
-                         * except the link status change interrupt.
                          * TODO
                          */
-                        val64 = MAC_INT_STATUS_RMAC_INT;
-                        temp64 = readq(&bar0->mac_int_mask);
-                        temp64 &= ~((u64) val64);
-                        writeq(temp64, &bar0->mac_int_mask);
-
-                        val64 = readq(&bar0->mac_rmac_err_mask);
-                        val64 &= ~((u64) RMAC_LINK_STATE_CHANGE_INT);
-                        writeq(val64, &bar0->mac_rmac_err_mask);
                 } else if (flag == DISABLE_INTRS) {
                         /*
                          * Disable MAC Intrs in the general intr mask register
@@ -1879,8 +1901,10 @@ static int start_nic(struct s2io_nic *nic)
         }
 
         /*  Enable select interrupts */
-        interruptible = TX_TRAFFIC_INTR | RX_TRAFFIC_INTR | TX_MAC_INTR |
-            RX_MAC_INTR | MC_INTR;
+        interruptible = TX_TRAFFIC_INTR | RX_TRAFFIC_INTR | MC_INTR;
+        interruptible |= TX_PIC_INTR | RX_PIC_INTR;
+        interruptible |= TX_MAC_INTR | RX_MAC_INTR;
+
         en_dis_able_nic_intrs(nic, interruptible, ENABLE_INTRS);
 
         /*
@@ -2004,8 +2028,9 @@ static void stop_nic(struct s2io_nic *nic)
         config = &nic->config;
 
         /*  Disable all interrupts */
-        interruptible = TX_TRAFFIC_INTR | RX_TRAFFIC_INTR | TX_MAC_INTR |
-            RX_MAC_INTR | MC_INTR;
+        interruptible = TX_TRAFFIC_INTR | RX_TRAFFIC_INTR | MC_INTR;
+        interruptible |= TX_PIC_INTR | RX_PIC_INTR;
+        interruptible |= TX_MAC_INTR | RX_MAC_INTR;
         en_dis_able_nic_intrs(nic, interruptible, DISABLE_INTRS);
 
         /*  Disable PRCs */
@@ -2618,10 +2643,12 @@ static void alarm_intr_handler(struct s2io_nic *nic)
         register u64 val64 = 0, err_reg = 0;
 
         /* Handling link status change error Intr */
-        err_reg = readq(&bar0->mac_rmac_err_reg);
-        writeq(err_reg, &bar0->mac_rmac_err_reg);
-        if (err_reg & RMAC_LINK_STATE_CHANGE_INT) {
-                schedule_work(&nic->set_link_task);
+        if (s2io_link_fault_indication(nic) == MAC_RMAC_ERR_TIMER) {
+                err_reg = readq(&bar0->mac_rmac_err_reg);
+                writeq(err_reg, &bar0->mac_rmac_err_reg);
+                if (err_reg & RMAC_LINK_STATE_CHANGE_INT) {
+                        schedule_work(&nic->set_link_task);
+                }
         }
 
         /* Handling Ecc errors */
@@ -2947,7 +2974,7 @@ int s2io_open(struct net_device *dev)
          * Nic is initialized
          */
         netif_carrier_off(dev);
-        sp->last_link_state = 0; /* Unkown link state */
+        sp->last_link_state = LINK_DOWN;
 
         /* Initialize H/W and enable interrupts */
         if (s2io_card_up(sp)) {
@@ -3159,6 +3186,53 @@ s2io_alarm_handle(unsigned long data)
         mod_timer(&sp->alarm_timer, jiffies + HZ / 2);
 }
 
+static void s2io_txpic_intr_handle(nic_t *sp)
+{
+        XENA_dev_config_t *bar0 = (XENA_dev_config_t *) sp->bar0;
+        u64 val64;
+
+        val64 = readq(&bar0->pic_int_status);
+        if (val64 & PIC_INT_GPIO) {
+                val64 = readq(&bar0->gpio_int_reg);
+                if ((val64 & GPIO_INT_REG_LINK_DOWN) &&
+                    (val64 & GPIO_INT_REG_LINK_UP)) {
+                        val64 |=  GPIO_INT_REG_LINK_DOWN;
+                        val64 |= GPIO_INT_REG_LINK_UP;
+                        writeq(val64, &bar0->gpio_int_reg);
+                        goto masking;
+                }
+
+                if (((sp->last_link_state == LINK_UP) &&
+                        (val64 & GPIO_INT_REG_LINK_DOWN)) ||
+                ((sp->last_link_state == LINK_DOWN) &&
+                (val64 & GPIO_INT_REG_LINK_UP))) {
+                        val64 = readq(&bar0->gpio_int_mask);
+                        val64 |=  GPIO_INT_MASK_LINK_DOWN;
+                        val64 |= GPIO_INT_MASK_LINK_UP;
+                        writeq(val64, &bar0->gpio_int_mask);
+                        s2io_set_link((unsigned long)sp);
+                }
+masking:
+                if (sp->last_link_state == LINK_UP) {
+                        /*enable down interrupt */
+                        val64 = readq(&bar0->gpio_int_mask);
+                        /* unmasks link down intr */
+                        val64 &=  ~GPIO_INT_MASK_LINK_DOWN;
+                        /* masks link up intr */
+                        val64 |= GPIO_INT_MASK_LINK_UP;
+                        writeq(val64, &bar0->gpio_int_mask);
+                } else {
+                        /*enable UP Interrupt */
+                        val64 = readq(&bar0->gpio_int_mask);
+                        /* unmasks link up interrupt */
+                        val64 &= ~GPIO_INT_MASK_LINK_UP;
+                        /* masks link down interrupt */
+                        val64 |=  GPIO_INT_MASK_LINK_DOWN;
+                        writeq(val64, &bar0->gpio_int_mask);
+                }
+        }
+}
+
 /**
  *  s2io_isr - ISR handler of the device .
  *  @irq: the irq of the device.
@@ -3241,6 +3315,8 @@ static irqreturn_t s2io_isr(int irq, void *dev_id, struct pt_regs *regs)
                         tx_intr_handler(&mac_control->fifos[i]);
         }
 
+        if (reason & GEN_INTR_TXPIC)
+                s2io_txpic_intr_handle(sp);
         /*
          * If the Rx buffer count is below the panic threshold then
          * reallocate the buffers from the interrupt handler itself,
@@ -4644,11 +4720,13 @@ static void s2io_set_link(unsigned long data)
         }
 
         subid = nic->pdev->subsystem_device;
-        /*
-         * Allow a small delay for the NICs self initiated
-         * cleanup to complete.
-         */
-        msleep(100);
+        if (s2io_link_fault_indication(nic) == MAC_RMAC_ERR_TIMER) {
+                /*
+                 * Allow a small delay for the NICs self initiated
+                 * cleanup to complete.
+                 */
+                msleep(100);
+        }
 
         val64 = readq(&bar0->adapter_status);
         if (verify_xena_quiescence(nic, val64, nic->device_enabled_once)) {
@@ -4666,13 +4744,16 @@ static void s2io_set_link(unsigned long data)
                                 val64 |= ADAPTER_LED_ON;
                                 writeq(val64, &bar0->adapter_control);
                         }
-                        val64 = readq(&bar0->adapter_status);
-                        if (!LINK_IS_UP(val64)) {
-                                DBG_PRINT(ERR_DBG, "%s:", dev->name);
-                                DBG_PRINT(ERR_DBG, " Link down");
-                                DBG_PRINT(ERR_DBG, "after ");
-                                DBG_PRINT(ERR_DBG, "enabling ");
-                                DBG_PRINT(ERR_DBG, "device \n");
+                        if (s2io_link_fault_indication(nic) ==
+                                                MAC_RMAC_ERR_TIMER) {
+                                val64 = readq(&bar0->adapter_status);
+                                if (!LINK_IS_UP(val64)) {
+                                        DBG_PRINT(ERR_DBG, "%s:", dev->name);
+                                        DBG_PRINT(ERR_DBG, " Link down");
+                                        DBG_PRINT(ERR_DBG, "after ");
+                                        DBG_PRINT(ERR_DBG, "enabling ");
+                                        DBG_PRINT(ERR_DBG, "device \n");
+                                }
                         }
                         if (nic->device_enabled_once == FALSE) {
                                 nic->device_enabled_once = TRUE;