net: lan966x: add the basic lan966x driver

This patch adds basic SwitchDev driver framework for lan966x. It
includes only the IO range mapping and probing of the switch.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/Kconfig

@@ -55,6 +55,7 @@ config LAN743X
 	  To compile this driver as a module, choose M here. The module will be
 	  called lan743x.
 
+source "drivers/net/ethernet/microchip/lan966x/Kconfig"
 source "drivers/net/ethernet/microchip/sparx5/Kconfig"
 
 endif # NET_VENDOR_MICROCHIP

drivers/net/ethernet/microchip/Makefile

@@ -9,4 +9,5 @@ obj-$(CONFIG_LAN743X) += lan743x.o
 
 lan743x-objs := lan743x_main.o lan743x_ethtool.o lan743x_ptp.o
 
+obj-$(CONFIG_LAN966X_SWITCH) += lan966x/
 obj-$(CONFIG_SPARX5_SWITCH) += sparx5/

drivers/net/ethernet/microchip/lan966x/Kconfig

@@ -0,0 +1,7 @@
+config LAN966X_SWITCH
+	tristate "Lan966x switch driver"
+	depends on HAS_IOMEM
+	depends on OF
+	select PHYLINK
+	help
+	  This driver supports the Lan966x network switch device.

drivers/net/ethernet/microchip/lan966x/Makefile

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the Microchip Lan966x network device drivers.
+#
+
+obj-$(CONFIG_LAN966X_SWITCH) += lan966x-switch.o
+
+lan966x-switch-objs  := lan966x_main.o

drivers/net/ethernet/microchip/lan966x/lan966x_main.c

@@ -0,0 +1,357 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/module.h>
+#include <linux/if_bridge.h>
+#include <linux/iopoll.h>
+#include <linux/of_platform.h>
+#include <linux/of_net.h>
+#include <linux/reset.h>
+
+#include "lan966x_main.h"
+
+#define READL_SLEEP_US			10
+#define READL_TIMEOUT_US		100000000
+
+#define IO_RANGES 2
+
+static const struct of_device_id lan966x_match[] = {
+	{ .compatible = "microchip,lan966x-switch" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, lan966x_match);
+
+struct lan966x_main_io_resource {
+	enum lan966x_target id;
+	phys_addr_t offset;
+	int range;
+};
+
+static const struct lan966x_main_io_resource lan966x_main_iomap[] =  {
+	{ TARGET_CPU,                   0xc0000, 0 }, /* 0xe00c0000 */
+	{ TARGET_ORG,                         0, 1 }, /* 0xe2000000 */
+	{ TARGET_GCB,                    0x4000, 1 }, /* 0xe2004000 */
+	{ TARGET_QS,                     0x8000, 1 }, /* 0xe2008000 */
+	{ TARGET_CHIP_TOP,              0x10000, 1 }, /* 0xe2010000 */
+	{ TARGET_REW,                   0x14000, 1 }, /* 0xe2014000 */
+	{ TARGET_SYS,                   0x28000, 1 }, /* 0xe2028000 */
+	{ TARGET_DEV,                   0x34000, 1 }, /* 0xe2034000 */
+	{ TARGET_DEV +  1,              0x38000, 1 }, /* 0xe2038000 */
+	{ TARGET_DEV +  2,              0x3c000, 1 }, /* 0xe203c000 */
+	{ TARGET_DEV +  3,              0x40000, 1 }, /* 0xe2040000 */
+	{ TARGET_DEV +  4,              0x44000, 1 }, /* 0xe2044000 */
+	{ TARGET_DEV +  5,              0x48000, 1 }, /* 0xe2048000 */
+	{ TARGET_DEV +  6,              0x4c000, 1 }, /* 0xe204c000 */
+	{ TARGET_DEV +  7,              0x50000, 1 }, /* 0xe2050000 */
+	{ TARGET_QSYS,                 0x100000, 1 }, /* 0xe2100000 */
+	{ TARGET_AFI,                  0x120000, 1 }, /* 0xe2120000 */
+	{ TARGET_ANA,                  0x140000, 1 }, /* 0xe2140000 */
+};
+
+static int lan966x_create_targets(struct platform_device *pdev,
+				  struct lan966x *lan966x)
+{
+	struct resource *iores[IO_RANGES];
+	void __iomem *begin[IO_RANGES];
+	int idx;
+
+	/* Initially map the entire range and after that update each target to
+	 * point inside the region at the correct offset. It is possible that
+	 * other devices access the same region so don't add any checks about
+	 * this.
+	 */
+	for (idx = 0; idx < IO_RANGES; idx++) {
+		iores[idx] = platform_get_resource(pdev, IORESOURCE_MEM,
+						   idx);
+		if (!iores[idx]) {
+			dev_err(&pdev->dev, "Invalid resource\n");
+			return -EINVAL;
+		}
+
+		begin[idx] = devm_ioremap(&pdev->dev,
+					  iores[idx]->start,
+					  resource_size(iores[idx]));
+		if (IS_ERR(begin[idx])) {
+			dev_err(&pdev->dev, "Unable to get registers: %s\n",
+				iores[idx]->name);
+			return PTR_ERR(begin[idx]);
+		}
+	}
+
+	for (idx = 0; idx < ARRAY_SIZE(lan966x_main_iomap); idx++) {
+		const struct lan966x_main_io_resource *iomap =
+			&lan966x_main_iomap[idx];
+
+		lan966x->regs[iomap->id] = begin[iomap->range] + iomap->offset;
+	}
+
+	return 0;
+}
+
+static int lan966x_probe_port(struct lan966x *lan966x, u32 p,
+			      phy_interface_t phy_mode)
+{
+	struct lan966x_port *port;
+
+	if (p >= lan966x->num_phys_ports)
+		return -EINVAL;
+
+	port = devm_kzalloc(lan966x->dev, sizeof(*port), GFP_KERNEL);
+	if (!port)
+		return -ENOMEM;
+
+	port->lan966x = lan966x;
+	port->chip_port = p;
+	port->pvid = PORT_PVID;
+	lan966x->ports[p] = port;
+
+	return 0;
+}
+
+static void lan966x_init(struct lan966x *lan966x)
+{
+	u32 p, i;
+
+	/* Flush queues */
+	lan_wr(lan_rd(lan966x, QS_XTR_FLUSH) |
+	       GENMASK(1, 0),
+	       lan966x, QS_XTR_FLUSH);
+
+	/* Allow to drain */
+	mdelay(1);
+
+	/* All Queues normal */
+	lan_wr(lan_rd(lan966x, QS_XTR_FLUSH) &
+	       ~(GENMASK(1, 0)),
+	       lan966x, QS_XTR_FLUSH);
+
+	/* Set MAC age time to default value, the entry is aged after
+	 * 2 * AGE_PERIOD
+	 */
+	lan_wr(ANA_AUTOAGE_AGE_PERIOD_SET(BR_DEFAULT_AGEING_TIME / 2 / HZ),
+	       lan966x, ANA_AUTOAGE);
+
+	/* Disable learning for frames discarded by VLAN ingress filtering */
+	lan_rmw(ANA_ADVLEARN_VLAN_CHK_SET(1),
+		ANA_ADVLEARN_VLAN_CHK,
+		lan966x, ANA_ADVLEARN);
+
+	/* Setup frame ageing - "2 sec" - The unit is 6.5 us on lan966x */
+	lan_wr(SYS_FRM_AGING_AGE_TX_ENA_SET(1) |
+	       (20000000 / 65),
+	       lan966x,  SYS_FRM_AGING);
+
+	/* Map the 8 CPU extraction queues to CPU port */
+	lan_wr(0, lan966x, QSYS_CPU_GROUP_MAP);
+
+	/* Do byte-swap and expect status after last data word
+	 * Extraction: Mode: manual extraction) | Byte_swap
+	 */
+	lan_wr(QS_XTR_GRP_CFG_MODE_SET(1) |
+	       QS_XTR_GRP_CFG_BYTE_SWAP_SET(1),
+	       lan966x, QS_XTR_GRP_CFG(0));
+
+	/* Injection: Mode: manual injection | Byte_swap */
+	lan_wr(QS_INJ_GRP_CFG_MODE_SET(1) |
+	       QS_INJ_GRP_CFG_BYTE_SWAP_SET(1),
+	       lan966x, QS_INJ_GRP_CFG(0));
+
+	lan_rmw(QS_INJ_CTRL_GAP_SIZE_SET(0),
+		QS_INJ_CTRL_GAP_SIZE,
+		lan966x, QS_INJ_CTRL(0));
+
+	/* Enable IFH insertion/parsing on CPU ports */
+	lan_wr(SYS_PORT_MODE_INCL_INJ_HDR_SET(1) |
+	       SYS_PORT_MODE_INCL_XTR_HDR_SET(1),
+	       lan966x, SYS_PORT_MODE(CPU_PORT));
+
+	/* Setup flooding PGIDs */
+	lan_wr(ANA_FLOODING_IPMC_FLD_MC4_DATA_SET(PGID_MCIPV4) |
+	       ANA_FLOODING_IPMC_FLD_MC4_CTRL_SET(PGID_MC) |
+	       ANA_FLOODING_IPMC_FLD_MC6_DATA_SET(PGID_MC) |
+	       ANA_FLOODING_IPMC_FLD_MC6_CTRL_SET(PGID_MC),
+	       lan966x, ANA_FLOODING_IPMC);
+
+	/* There are 8 priorities */
+	for (i = 0; i < 8; ++i)
+		lan_rmw(ANA_FLOODING_FLD_MULTICAST_SET(PGID_MC) |
+			ANA_FLOODING_FLD_BROADCAST_SET(PGID_BC),
+			ANA_FLOODING_FLD_MULTICAST |
+			ANA_FLOODING_FLD_BROADCAST,
+			lan966x, ANA_FLOODING(i));
+
+	for (i = 0; i < PGID_ENTRIES; ++i)
+		/* Set all the entries to obey VLAN_VLAN */
+		lan_rmw(ANA_PGID_CFG_OBEY_VLAN_SET(1),
+			ANA_PGID_CFG_OBEY_VLAN,
+			lan966x, ANA_PGID_CFG(i));
+
+	for (p = 0; p < lan966x->num_phys_ports; p++) {
+		/* Disable bridging by default */
+		lan_rmw(ANA_PGID_PGID_SET(0x0),
+			ANA_PGID_PGID,
+			lan966x, ANA_PGID(p + PGID_SRC));
+
+		/* Do not forward BPDU frames to the front ports and copy them
+		 * to CPU
+		 */
+		lan_wr(0xffff, lan966x, ANA_CPU_FWD_BPDU_CFG(p));
+	}
+
+	/* Set source buffer size for each priority and each port to 1500 bytes */
+	for (i = 0; i <= QSYS_Q_RSRV; ++i) {
+		lan_wr(1500 / 64, lan966x, QSYS_RES_CFG(i));
+		lan_wr(1500 / 64, lan966x, QSYS_RES_CFG(512 + i));
+	}
+
+	/* Enable switching to/from cpu port */
+	lan_wr(QSYS_SW_PORT_MODE_PORT_ENA_SET(1) |
+	       QSYS_SW_PORT_MODE_SCH_NEXT_CFG_SET(1) |
+	       QSYS_SW_PORT_MODE_INGRESS_DROP_MODE_SET(1),
+	       lan966x,  QSYS_SW_PORT_MODE(CPU_PORT));
+
+	/* Configure and enable the CPU port */
+	lan_rmw(ANA_PGID_PGID_SET(0),
+		ANA_PGID_PGID,
+		lan966x, ANA_PGID(CPU_PORT));
+	lan_rmw(ANA_PGID_PGID_SET(BIT(CPU_PORT)),
+		ANA_PGID_PGID,
+		lan966x, ANA_PGID(PGID_CPU));
+
+	/* Multicast to all other ports */
+	lan_rmw(GENMASK(lan966x->num_phys_ports - 1, 0),
+		ANA_PGID_PGID,
+		lan966x, ANA_PGID(PGID_MC));
+
+	/* This will be controlled by mrouter ports */
+	lan_rmw(GENMASK(lan966x->num_phys_ports - 1, 0),
+		ANA_PGID_PGID,
+		lan966x, ANA_PGID(PGID_MCIPV4));
+
+	/* Broadcast to the CPU port and to other ports */
+	lan_rmw(ANA_PGID_PGID_SET(BIT(CPU_PORT) | GENMASK(lan966x->num_phys_ports - 1, 0)),
+		ANA_PGID_PGID,
+		lan966x, ANA_PGID(PGID_BC));
+
+	lan_wr(REW_PORT_CFG_NO_REWRITE_SET(1),
+	       lan966x, REW_PORT_CFG(CPU_PORT));
+
+	lan_rmw(ANA_ANAINTR_INTR_ENA_SET(1),
+		ANA_ANAINTR_INTR_ENA,
+		lan966x, ANA_ANAINTR);
+}
+
+static int lan966x_ram_init(struct lan966x *lan966x)
+{
+	return lan_rd(lan966x, SYS_RAM_INIT);
+}
+
+static int lan966x_reset_switch(struct lan966x *lan966x)
+{
+	struct reset_control *switch_reset, *phy_reset;
+	int val = 0;
+	int ret;
+
+	switch_reset = devm_reset_control_get_shared(lan966x->dev, "switch");
+	if (IS_ERR(switch_reset))
+		return dev_err_probe(lan966x->dev, PTR_ERR(switch_reset),
+				     "Could not obtain switch reset");
+
+	phy_reset = devm_reset_control_get_shared(lan966x->dev, "phy");
+	if (IS_ERR(phy_reset))
+		return dev_err_probe(lan966x->dev, PTR_ERR(phy_reset),
+				     "Could not obtain phy reset\n");
+
+	reset_control_reset(switch_reset);
+	reset_control_reset(phy_reset);
+
+	lan_wr(SYS_RESET_CFG_CORE_ENA_SET(0), lan966x, SYS_RESET_CFG);
+	lan_wr(SYS_RAM_INIT_RAM_INIT_SET(1), lan966x, SYS_RAM_INIT);
+	ret = readx_poll_timeout(lan966x_ram_init, lan966x,
+				 val, (val & BIT(1)) == 0, READL_SLEEP_US,
+				 READL_TIMEOUT_US);
+	if (ret)
+		return ret;
+
+	lan_wr(SYS_RESET_CFG_CORE_ENA_SET(1), lan966x, SYS_RESET_CFG);
+
+	return 0;
+}
+
+static int lan966x_probe(struct platform_device *pdev)
+{
+	struct fwnode_handle *ports, *portnp;
+	struct lan966x *lan966x;
+	int err, i;
+
+	lan966x = devm_kzalloc(&pdev->dev, sizeof(*lan966x), GFP_KERNEL);
+	if (!lan966x)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, lan966x);
+	lan966x->dev = &pdev->dev;
+
+	ports = device_get_named_child_node(&pdev->dev, "ethernet-ports");
+	if (!ports)
+		return dev_err_probe(&pdev->dev, -ENODEV,
+				     "no ethernet-ports child found\n");
+
+	err = lan966x_create_targets(pdev, lan966x);
+	if (err)
+		return dev_err_probe(&pdev->dev, err,
+				     "Failed to create targets");
+
+	err = lan966x_reset_switch(lan966x);
+	if (err)
+		return dev_err_probe(&pdev->dev, err, "Reset failed");
+
+	i = 0;
+	fwnode_for_each_available_child_node(ports, portnp)
+		++i;
+
+	lan966x->num_phys_ports = i;
+	lan966x->ports = devm_kcalloc(&pdev->dev, lan966x->num_phys_ports,
+				      sizeof(struct lan966x_port *),
+				      GFP_KERNEL);
+	if (!lan966x->ports)
+		return -ENOMEM;
+
+	/* There QS system has 32KB of memory */
+	lan966x->shared_queue_sz = LAN966X_BUFFER_MEMORY;
+
+	/* init switch */
+	lan966x_init(lan966x);
+
+	/* go over the child nodes */
+	fwnode_for_each_available_child_node(ports, portnp) {
+		phy_interface_t phy_mode;
+		u32 p;
+
+		if (fwnode_property_read_u32(portnp, "reg", &p))
+			continue;
+
+		phy_mode = fwnode_get_phy_mode(portnp);
+		err = lan966x_probe_port(lan966x, p, phy_mode);
+		if (err)
+			goto cleanup_ports;
+	}
+
+	return 0;
+
+cleanup_ports:
+	fwnode_handle_put(portnp);
+
+	return err;
+}
+
+static struct platform_driver lan966x_driver = {
+	.probe = lan966x_probe,
+	.driver = {
+		.name = "lan966x-switch",
+		.of_match_table = lan966x_match,
+	},
+};
+module_platform_driver(lan966x_driver);
+
+MODULE_DESCRIPTION("Microchip LAN966X switch driver");
+MODULE_AUTHOR("Horatiu Vultur <horatiu.vultur@microchip.com>");
+MODULE_LICENSE("Dual MIT/GPL");