net: txgbe: Store PCI info

Get PCI config space info, set LAN id and check flash status.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/wangxun/Kconfig

@@ -16,6 +16,11 @@ config NET_VENDOR_WANGXUN
 
 if NET_VENDOR_WANGXUN
 
+config LIBWX
+	tristate
+	help
+	Common library for Wangxun(R) Ethernet drivers.
+
 config NGBE
 	tristate "Wangxun(R) GbE PCI Express adapters support"
 	depends on PCI
@@ -32,6 +37,7 @@ config NGBE
 config TXGBE
 	tristate "Wangxun(R) 10GbE PCI Express adapters support"
 	depends on PCI
+	select LIBWX
 	help
 	  This driver supports Wangxun(R) 10GbE PCI Express family of
 	  adapters.

drivers/net/ethernet/wangxun/Makefile

@@ -3,5 +3,6 @@
 # Makefile for the Wangxun network device drivers.
 #
 
+obj-$(CONFIG_LIBWX) += libwx/
 obj-$(CONFIG_TXGBE) += txgbe/
 obj-$(CONFIG_NGBE) += ngbe/

drivers/net/ethernet/wangxun/libwx/Makefile

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2015 - 2022 Beijing WangXun Technology Co., Ltd.
+#
+
+obj-$(CONFIG_LIBWX) += libwx.o
+
+libwx-objs := wx_hw.o

drivers/net/ethernet/wangxun/libwx/wx_hw.c

@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2015 - 2022 Beijing WangXun Technology Co., Ltd. */
+
+#include <linux/iopoll.h>
+#include <linux/pci.h>
+
+#include "wx_type.h"
+#include "wx_hw.h"
+
+/* cmd_addr is used for some special command:
+ * 1. to be sector address, when implemented erase sector command
+ * 2. to be flash address when implemented read, write flash address
+ */
+static int wx_fmgr_cmd_op(struct wx_hw *wxhw, u32 cmd, u32 cmd_addr)
+{
+	u32 cmd_val = 0, val = 0;
+
+	cmd_val = WX_SPI_CMD_CMD(cmd) |
+		  WX_SPI_CMD_CLK(WX_SPI_CLK_DIV) |
+		  cmd_addr;
+	wr32(wxhw, WX_SPI_CMD, cmd_val);
+
+	return read_poll_timeout(rd32, val, (val & 0x1), 10, 100000,
+				 false, wxhw, WX_SPI_STATUS);
+}
+
+static int wx_flash_read_dword(struct wx_hw *wxhw, u32 addr, u32 *data)
+{
+	int ret = 0;
+
+	ret = wx_fmgr_cmd_op(wxhw, WX_SPI_CMD_READ_DWORD, addr);
+	if (ret < 0)
+		return ret;
+
+	*data = rd32(wxhw, WX_SPI_DATA);
+
+	return ret;
+}
+
+int wx_check_flash_load(struct wx_hw *hw, u32 check_bit)
+{
+	u32 reg = 0;
+	int err = 0;
+
+	/* if there's flash existing */
+	if (!(rd32(hw, WX_SPI_STATUS) &
+	      WX_SPI_STATUS_FLASH_BYPASS)) {
+		/* wait hw load flash done */
+		err = read_poll_timeout(rd32, reg, !(reg & check_bit), 20000, 2000000,
+					false, hw, WX_SPI_ILDR_STATUS);
+		if (err < 0)
+			wx_err(hw, "Check flash load timeout.\n");
+	}
+
+	return err;
+}
+EXPORT_SYMBOL(wx_check_flash_load);
+
+int wx_sw_init(struct wx_hw *wxhw)
+{
+	struct pci_dev *pdev = wxhw->pdev;
+	u32 ssid = 0;
+	int err = 0;
+
+	wxhw->vendor_id = pdev->vendor;
+	wxhw->device_id = pdev->device;
+	wxhw->revision_id = pdev->revision;
+	wxhw->oem_svid = pdev->subsystem_vendor;
+	wxhw->oem_ssid = pdev->subsystem_device;
+	wxhw->bus.device = PCI_SLOT(pdev->devfn);
+	wxhw->bus.func = PCI_FUNC(pdev->devfn);
+
+	if (wxhw->oem_svid == PCI_VENDOR_ID_WANGXUN) {
+		wxhw->subsystem_vendor_id = pdev->subsystem_vendor;
+		wxhw->subsystem_device_id = pdev->subsystem_device;
+	} else {
+		err = wx_flash_read_dword(wxhw, 0xfffdc, &ssid);
+		if (!err)
+			wxhw->subsystem_device_id = swab16((u16)ssid);
+
+		return err;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(wx_sw_init);
+
+MODULE_LICENSE("GPL");

drivers/net/ethernet/wangxun/libwx/wx_hw.h

@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2015 - 2022 Beijing WangXun Technology Co., Ltd. */
+
+#ifndef _WX_HW_H_
+#define _WX_HW_H_
+
+int wx_check_flash_load(struct wx_hw *hw, u32 check_bit);
+int wx_sw_init(struct wx_hw *wxhw);
+
+#endif /* _WX_HW_H_ */

drivers/net/ethernet/wangxun/libwx/wx_type.h

@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2015 - 2022 Beijing WangXun Technology Co., Ltd. */
+
+#ifndef _WX_TYPE_H_
+#define _WX_TYPE_H_
+
+/* Vendor ID */
+#ifndef PCI_VENDOR_ID_WANGXUN
+#define PCI_VENDOR_ID_WANGXUN                   0x8088
+#endif
+
+/* FMGR Registers */
+#define WX_SPI_CMD                   0x10104
+#define WX_SPI_CMD_READ_DWORD        0x1
+#define WX_SPI_CLK_DIV               0x3
+#define WX_SPI_CMD_CMD(_v)           (((_v) & 0x7) << 28)
+#define WX_SPI_CMD_CLK(_v)           (((_v) & 0x7) << 25)
+#define WX_SPI_CMD_ADDR(_v)          (((_v) & 0xFFFFFF))
+#define WX_SPI_DATA                  0x10108
+#define WX_SPI_DATA_BYPASS           BIT(31)
+#define WX_SPI_DATA_STATUS(_v)       (((_v) & 0xFF) << 16)
+#define WX_SPI_DATA_OP_DONE          BIT(0)
+#define WX_SPI_STATUS                0x1010C
+#define WX_SPI_STATUS_OPDONE         BIT(0)
+#define WX_SPI_STATUS_FLASH_BYPASS   BIT(31)
+#define WX_SPI_ILDR_STATUS           0x10120
+
+/* Bus parameters */
+struct wx_bus_info {
+	u8 func;
+	u16 device;
+};
+
+struct wx_hw {
+	u8 __iomem *hw_addr;
+	struct pci_dev *pdev;
+	struct wx_bus_info bus;
+	u16 device_id;
+	u16 vendor_id;
+	u16 subsystem_device_id;
+	u16 subsystem_vendor_id;
+	u8 revision_id;
+	u16 oem_ssid;
+	u16 oem_svid;
+};
+
+/* register operations */
+#define wr32(a, reg, value)	writel((value), ((a)->hw_addr + (reg)))
+#define rd32(a, reg)		readl((a)->hw_addr + (reg))
+
+#define wx_err(wxhw, fmt, arg...) \
+	dev_err(&(wxhw)->pdev->dev, fmt, ##arg)
+
+#endif /* _WX_TYPE_H_ */

drivers/net/ethernet/wangxun/txgbe/txgbe.h

@@ -17,6 +17,10 @@ struct txgbe_adapter {
 	/* OS defined structs */
 	struct net_device *netdev;
 	struct pci_dev *pdev;
+
+	/* structs defined in txgbe_type.h */
+	struct txgbe_hw hw;
+	u16 msg_enable;
 };
 
 extern char txgbe_driver_name[];

drivers/net/ethernet/wangxun/txgbe/txgbe_main.c

@@ -9,6 +9,8 @@
 #include <linux/aer.h>
 #include <linux/etherdevice.h>
 
+#include "../libwx/wx_type.h"
+#include "../libwx/wx_hw.h"
 #include "txgbe.h"
 
 char txgbe_driver_name[] = "txgbe";
@@ -30,6 +32,69 @@ static const struct pci_device_id txgbe_pci_tbl[] = {
 
 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 
+static void txgbe_check_minimum_link(struct txgbe_adapter *adapter)
+{
+	struct pci_dev *pdev;
+
+	pdev = adapter->pdev;
+	pcie_print_link_status(pdev);
+}
+
+/**
+ * txgbe_enumerate_functions - Get the number of ports this device has
+ * @adapter: adapter structure
+ *
+ * This function enumerates the phsyical functions co-located on a single slot,
+ * in order to determine how many ports a device has. This is most useful in
+ * determining the required GT/s of PCIe bandwidth necessary for optimal
+ * performance.
+ **/
+static int txgbe_enumerate_functions(struct txgbe_adapter *adapter)
+{
+	struct pci_dev *entry, *pdev = adapter->pdev;
+	int physfns = 0;
+
+	list_for_each_entry(entry, &pdev->bus->devices, bus_list) {
+		/* When the devices on the bus don't all match our device ID,
+		 * we can't reliably determine the correct number of
+		 * functions. This can occur if a function has been direct
+		 * attached to a virtual machine using VT-d.
+		 */
+		if (entry->vendor != pdev->vendor ||
+		    entry->device != pdev->device)
+			return -EINVAL;
+
+		physfns++;
+	}
+
+	return physfns;
+}
+
+/**
+ * txgbe_sw_init - Initialize general software structures (struct txgbe_adapter)
+ * @adapter: board private structure to initialize
+ **/
+static int txgbe_sw_init(struct txgbe_adapter *adapter)
+{
+	struct pci_dev *pdev = adapter->pdev;
+	struct txgbe_hw *hw = &adapter->hw;
+	struct wx_hw *wxhw = &hw->wxhw;
+	int err;
+
+	wxhw->hw_addr = adapter->io_addr;
+	wxhw->pdev = pdev;
+
+	/* PCI config space info */
+	err = wx_sw_init(wxhw);
+	if (err < 0) {
+		netif_err(adapter, probe, adapter->netdev,
+			  "read of internal subsystem device id failed\n");
+		return err;
+	}
+
+	return 0;
+}
+
 static void txgbe_dev_shutdown(struct pci_dev *pdev, bool *enable_wake)
 {
 	struct txgbe_adapter *adapter = pci_get_drvdata(pdev);
@@ -67,8 +132,10 @@ static int txgbe_probe(struct pci_dev *pdev,
 		       const struct pci_device_id __always_unused *ent)
 {
 	struct txgbe_adapter *adapter = NULL;
+	struct txgbe_hw *hw = NULL;
+	struct wx_hw *wxhw = NULL;
 	struct net_device *netdev;
-	int err;
+	int err, expected_gts;
 
 	err = pci_enable_device_mem(pdev);
 	if (err)
@@ -107,6 +174,9 @@ static int txgbe_probe(struct pci_dev *pdev,
 	adapter = netdev_priv(netdev);
 	adapter->netdev = netdev;
 	adapter->pdev = pdev;
+	hw = &adapter->hw;
+	wxhw = &hw->wxhw;
+	adapter->msg_enable = (1 << DEFAULT_DEBUG_LEVEL_SHIFT) - 1;
 
 	adapter->io_addr = devm_ioremap(&pdev->dev,
 					pci_resource_start(pdev, 0),
@@ -116,10 +186,39 @@ static int txgbe_probe(struct pci_dev *pdev,
 		goto err_pci_release_regions;
 	}
 
+	strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
+
+	/* setup the private structure */
+	err = txgbe_sw_init(adapter);
+	if (err)
+		goto err_pci_release_regions;
+
+	/* check if flash load is done after hw power up */
+	err = wx_check_flash_load(wxhw, TXGBE_SPI_ILDR_STATUS_PERST);
+	if (err)
+		goto err_pci_release_regions;
+	err = wx_check_flash_load(wxhw, TXGBE_SPI_ILDR_STATUS_PWRRST);
+	if (err)
+		goto err_pci_release_regions;
+
 	netdev->features |= NETIF_F_HIGHDMA;
 
 	pci_set_drvdata(pdev, adapter);
 
+	/* calculate the expected PCIe bandwidth required for optimal
+	 * performance. Note that some older parts will never have enough
+	 * bandwidth due to being older generation PCIe parts. We clamp these
+	 * parts to ensure that no warning is displayed, as this could confuse
+	 * users otherwise.
+	 */
+	expected_gts = txgbe_enumerate_functions(adapter) * 10;
+
+	/* don't check link if we failed to enumerate functions */
+	if (expected_gts > 0)
+		txgbe_check_minimum_link(adapter);
+	else
+		dev_warn(&pdev->dev, "Failed to enumerate PF devices.\n");
+
 	return 0;
 
 err_pci_release_regions:

drivers/net/ethernet/wangxun/txgbe/txgbe_type.h

@@ -4,15 +4,6 @@
 #ifndef _TXGBE_TYPE_H_
 #define _TXGBE_TYPE_H_
 
-#include <linux/types.h>
-#include <linux/netdevice.h>
-
-/************ txgbe_register.h ************/
-/* Vendor ID */
-#ifndef PCI_VENDOR_ID_WANGXUN
-#define PCI_VENDOR_ID_WANGXUN                   0x8088
-#endif
-
 /* Device IDs */
 #define TXGBE_DEV_ID_SP1000                     0x1001
 #define TXGBE_DEV_ID_WX1820                     0x2001
@@ -54,4 +45,14 @@
 /* Revision ID */
 #define TXGBE_SP_MPW  1
 
+/**************** SP Registers ****************************/
+/* FMGR Registers */
+#define TXGBE_SPI_ILDR_STATUS                   0x10120
+#define TXGBE_SPI_ILDR_STATUS_PERST             BIT(0) /* PCIE_PERST is done */
+#define TXGBE_SPI_ILDR_STATUS_PWRRST            BIT(1) /* Power on reset is done */
+
+struct txgbe_hw {
+	struct wx_hw wxhw;
+};
+
 #endif /* _TXGBE_TYPE_H_ */