bnxt_en: Add RESET_FW state logic to bnxt_fw_reset_task().

This state handles driver initiated chip reset during error recovery.
Only the master function will perform this step during error recovery.
The next patch will add code to initiate this reset from the master
function.
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -10402,6 +10402,62 @@ static int bnxt_fw_init_one(struct bnxt *bp)
 	return 0;
 }
 
+static void bnxt_fw_reset_writel(struct bnxt *bp, int reg_idx)
+{
+	struct bnxt_fw_health *fw_health = bp->fw_health;
+	u32 reg = fw_health->fw_reset_seq_regs[reg_idx];
+	u32 val = fw_health->fw_reset_seq_vals[reg_idx];
+	u32 reg_type, reg_off, delay_msecs;
+
+	delay_msecs = fw_health->fw_reset_seq_delay_msec[reg_idx];
+	reg_type = BNXT_FW_HEALTH_REG_TYPE(reg);
+	reg_off = BNXT_FW_HEALTH_REG_OFF(reg);
+	switch (reg_type) {
+	case BNXT_FW_HEALTH_REG_TYPE_CFG:
+		pci_write_config_dword(bp->pdev, reg_off, val);
+		break;
+	case BNXT_FW_HEALTH_REG_TYPE_GRC:
+		writel(reg_off & BNXT_GRC_BASE_MASK,
+		       bp->bar0 + BNXT_GRCPF_REG_WINDOW_BASE_OUT + 4);
+		reg_off = (reg_off & BNXT_GRC_OFFSET_MASK) + 0x2000;
+		/* fall through */
+	case BNXT_FW_HEALTH_REG_TYPE_BAR0:
+		writel(val, bp->bar0 + reg_off);
+		break;
+	case BNXT_FW_HEALTH_REG_TYPE_BAR1:
+		writel(val, bp->bar1 + reg_off);
+		break;
+	}
+	if (delay_msecs) {
+		pci_read_config_dword(bp->pdev, 0, &val);
+		msleep(delay_msecs);
+	}
+}
+
+static void bnxt_reset_all(struct bnxt *bp)
+{
+	struct bnxt_fw_health *fw_health = bp->fw_health;
+	int i;
+
+	if (fw_health->flags & ERROR_RECOVERY_QCFG_RESP_FLAGS_HOST) {
+		for (i = 0; i < fw_health->fw_reset_seq_cnt; i++)
+			bnxt_fw_reset_writel(bp, i);
+	} else if (fw_health->flags & ERROR_RECOVERY_QCFG_RESP_FLAGS_CO_CPU) {
+		struct hwrm_fw_reset_input req = {0};
+		int rc;
+
+		bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_FW_RESET, -1, -1);
+		req.resp_addr = cpu_to_le64(bp->hwrm_cmd_kong_resp_dma_addr);
+		req.embedded_proc_type = FW_RESET_REQ_EMBEDDED_PROC_TYPE_CHIP;
+		req.selfrst_status = FW_RESET_REQ_SELFRST_STATUS_SELFRSTASAP;
+		req.flags = FW_RESET_REQ_FLAGS_RESET_GRACEFUL;
+		rc = hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
+		if (rc)
+			netdev_warn(bp->dev, "Unable to reset FW rc=%d\n", rc);
+	}
+	bp->fw_reset_timestamp = jiffies;
+}
+
 static void bnxt_fw_reset_task(struct work_struct *work)
 {
 	struct bnxt *bp = container_of(work, struct bnxt, fw_reset_task.work);
@@ -10441,6 +10497,14 @@ static void bnxt_fw_reset_task(struct work_struct *work)
 		rtnl_unlock();
 		bnxt_queue_fw_reset_work(bp, bp->fw_reset_min_dsecs * HZ / 10);
 		return;
+	case BNXT_FW_RESET_STATE_RESET_FW: {
+		u32 wait_dsecs = bp->fw_health->post_reset_wait_dsecs;
+
+		bnxt_reset_all(bp);
+		bp->fw_reset_state = BNXT_FW_RESET_STATE_ENABLE_DEV;
+		bnxt_queue_fw_reset_work(bp, wait_dsecs * HZ / 10);
+		return;
+	}
 	case BNXT_FW_RESET_STATE_ENABLE_DEV:
 		clear_bit(BNXT_STATE_FW_FATAL_COND, &bp->state);
 		if (pci_enable_device(bp->pdev)) {