stmmac: pci: Add dwmac support for Loongson

This GMAC module is integrated into the Loongson-2K SoC and the LS7A
bridge chip.

Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/Kconfig

@@ -250,6 +250,15 @@ config DWMAC_INTEL
 	  This selects the Intel platform specific bus support for the
 	  stmmac driver. This driver is used for Intel Quark/EHL/TGL.
 
+config DWMAC_LOONGSON
+	tristate "Loongson PCI DWMAC support"
+	default MACH_LOONGSON64
+	depends on STMMAC_ETH && PCI
+	depends on COMMON_CLK
+	help
+	  This selects the LOONGSON PCI bus support for the stmmac driver,
+	  Support for ethernet controller on Loongson-2K1000 SoC and LS7A1000 bridge.
+
 config STMMAC_PCI
 	tristate "STMMAC PCI bus support"
 	depends on STMMAC_ETH && PCI

drivers/net/ethernet/stmicro/stmmac/Makefile

@@ -37,4 +37,5 @@ dwmac-altr-socfpga-objs := altr_tse_pcs.o dwmac-socfpga.o
 
 obj-$(CONFIG_STMMAC_PCI)	+= stmmac-pci.o
 obj-$(CONFIG_DWMAC_INTEL)	+= dwmac-intel.o
+obj-$(CONFIG_DWMAC_LOONGSON)	+= dwmac-loongson.o
 stmmac-pci-objs:= stmmac_pci.o

drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c

@@ -0,0 +1,218 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020, Loongson Corporation
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/pci.h>
+#include <linux/dmi.h>
+#include <linux/device.h>
+#include <linux/of_irq.h>
+#include "stmmac.h"
+
+static int loongson_default_data(struct plat_stmmacenet_data *plat)
+{
+	plat->clk_csr = 2;	/* clk_csr_i = 20-35MHz & MDC = clk_csr_i/16 */
+	plat->has_gmac = 1;
+	plat->force_sf_dma_mode = 1;
+
+	/* Set default value for multicast hash bins */
+	plat->multicast_filter_bins = HASH_TABLE_SIZE;
+
+	/* Set default value for unicast filter entries */
+	plat->unicast_filter_entries = 1;
+
+	/* Set the maxmtu to a default of JUMBO_LEN */
+	plat->maxmtu = JUMBO_LEN;
+
+	/* Set default number of RX and TX queues to use */
+	plat->tx_queues_to_use = 1;
+	plat->rx_queues_to_use = 1;
+
+	/* Disable Priority config by default */
+	plat->tx_queues_cfg[0].use_prio = false;
+	plat->rx_queues_cfg[0].use_prio = false;
+
+	/* Disable RX queues routing by default */
+	plat->rx_queues_cfg[0].pkt_route = 0x0;
+
+	/* Default to phy auto-detection */
+	plat->phy_addr = -1;
+
+	plat->dma_cfg->pbl = 32;
+	plat->dma_cfg->pblx8 = true;
+
+	plat->multicast_filter_bins = 256;
+	return 0;
+}
+
+static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct plat_stmmacenet_data *plat;
+	struct stmmac_resources res;
+	int ret, i, mdio;
+	struct device_node *np;
+
+	np = dev_of_node(&pdev->dev);
+
+	if (!np) {
+		pr_info("dwmac_loongson_pci: No OF node\n");
+		return -ENODEV;
+	}
+
+	if (!of_device_is_compatible(np, "loongson, pci-gmac")) {
+		pr_info("dwmac_loongson_pci: Incompatible OF node\n");
+		return -ENODEV;
+	}
+
+	plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
+	if (!plat)
+		return -ENOMEM;
+
+	if (plat->mdio_node) {
+		dev_err(&pdev->dev, "Found MDIO subnode\n");
+		mdio = true;
+	}
+
+	if (mdio) {
+		plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
+						   sizeof(*plat->mdio_bus_data),
+						   GFP_KERNEL);
+		if (!plat->mdio_bus_data)
+			return -ENOMEM;
+		plat->mdio_bus_data->needs_reset = true;
+	}
+
+	plat->dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*plat->dma_cfg), GFP_KERNEL);
+	if (!plat->dma_cfg)
+		return -ENOMEM;
+
+	/* Enable pci device */
+	ret = pci_enable_device(pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "%s: ERROR: failed to enable device\n", __func__);
+		return ret;
+	}
+
+	/* Get the base address of device */
+	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+		if (pci_resource_len(pdev, i) == 0)
+			continue;
+		ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
+		if (ret)
+			return ret;
+		break;
+	}
+
+	plat->bus_id = of_alias_get_id(np, "ethernet");
+	if (plat->bus_id < 0)
+		plat->bus_id = pci_dev_id(pdev);
+
+	plat->phy_interface = device_get_phy_mode(&pdev->dev);
+	if (plat->phy_interface < 0)
+		dev_err(&pdev->dev, "phy_mode not found\n");
+
+	plat->interface = PHY_INTERFACE_MODE_GMII;
+
+	pci_set_master(pdev);
+
+	loongson_default_data(plat);
+	pci_enable_msi(pdev);
+	memset(&res, 0, sizeof(res));
+	res.addr = pcim_iomap_table(pdev)[0];
+
+	res.irq = of_irq_get_byname(np, "macirq");
+	if (res.irq < 0) {
+		dev_err(&pdev->dev, "IRQ macirq not found\n");
+		ret = -ENODEV;
+	}
+
+	res.wol_irq = of_irq_get_byname(np, "eth_wake_irq");
+	if (res.wol_irq < 0) {
+		dev_info(&pdev->dev, "IRQ eth_wake_irq not found, using macirq\n");
+		res.wol_irq = res.irq;
+	}
+
+	res.lpi_irq = of_irq_get_byname(np, "eth_lpi");
+	if (res.lpi_irq < 0) {
+		dev_err(&pdev->dev, "IRQ eth_lpi not found\n");
+		ret = -ENODEV;
+	}
+
+	return stmmac_dvr_probe(&pdev->dev, plat, &res);
+}
+
+static void loongson_dwmac_remove(struct pci_dev *pdev)
+{
+	int i;
+
+	stmmac_dvr_remove(&pdev->dev);
+
+	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+		if (pci_resource_len(pdev, i) == 0)
+			continue;
+		pcim_iounmap_regions(pdev, BIT(i));
+		break;
+	}
+
+	pci_disable_device(pdev);
+}
+
+static int __maybe_unused loongson_dwmac_suspend(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	int ret;
+
+	ret = stmmac_suspend(dev);
+	if (ret)
+		return ret;
+
+	ret = pci_save_state(pdev);
+	if (ret)
+		return ret;
+
+	pci_disable_device(pdev);
+	pci_wake_from_d3(pdev, true);
+	return 0;
+}
+
+static int __maybe_unused loongson_dwmac_resume(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	int ret;
+
+	pci_restore_state(pdev);
+	pci_set_power_state(pdev, PCI_D0);
+
+	ret = pci_enable_device(pdev);
+	if (ret)
+		return ret;
+
+	pci_set_master(pdev);
+
+	return stmmac_resume(dev);
+}
+
+static SIMPLE_DEV_PM_OPS(loongson_dwmac_pm_ops, loongson_dwmac_suspend,
+			 loongson_dwmac_resume);
+
+static const struct pci_device_id loongson_dwmac_id_table[] = {
+	{ PCI_VDEVICE(LOONGSON, 0x7a03) },
+	{}
+};
+MODULE_DEVICE_TABLE(pci, loongson_dwmac_id_table);
+
+struct pci_driver loongson_dwmac_driver = {
+	.name = "dwmac-loongson-pci",
+	.id_table = loongson_dwmac_id_table,
+	.probe = loongson_dwmac_probe,
+	.remove = loongson_dwmac_remove,
+	.driver = {
+		.pm = &loongson_dwmac_pm_ops,
+	},
+};
+
+module_pci_driver(loongson_dwmac_driver);
+
+MODULE_DESCRIPTION("Loongson DWMAC PCI driver");
+MODULE_AUTHOR("Qing Zhang <zhangqing@loongson.cn>");
+MODULE_LICENSE("GPL v2");