net/vsc9953: Add driver for Vitesse VSC9953 L2 Switch IP

This patch adds a driver for VSC9953 L2 Switch. This Vitesse IP
is integrated in Freescale T1040 and T1020 SoCs.
The L2 switch has 10 Ethernet ports: 2 internal fixed-links
(ports 8 and 9) at 2.5 Gbps and and 8 external ports at 1 Gbps.
The external ports may be connected to PHYs over QSGMII and SGMII.

Commands have also been added to enable/disable a port and to
check a port's link speed, duplexity and status. The commands are:

ethsw port <port_nr> enable|disable - enable/disable an l2 switch port
ethsw port <port_nr> show - show an l2 switch port's configuration

port_nr=0..9; use "all" for all ports

For more detailse please see doc/README.t1040-l2switch

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@freescale.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: York Sun <yorksun@freescale.com>

2 files changed, 498 insertions, 0 deletions

diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index fb0cf8c..46c4ac6 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -66,3 +66,4 @@ obj-$(CONFIG_XILINX_LL_TEMAC) += xilinx_ll_temac.o xilinx_ll_temac_mdio.o \
 		xilinx_ll_temac_fifo.o xilinx_ll_temac_sdma.o
 obj-$(CONFIG_ZYNQ_GEM) += zynq_gem.o
 obj-$(CONFIG_FSL_MC_ENET) += fsl_mc/
+obj-$(CONFIG_VSC9953) += vsc9953.o
diff --git a/drivers/net/vsc9953.c b/drivers/net/vsc9953.c
new file mode 100644
index 0000000..9fc3c18
--- /dev/null
+++ b/drivers/net/vsc9953.c
@@ -0,0 +1,497 @@
+/*
+ *  Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ *  SPDX-License-Identifier:      GPL-2.0+
+ *
+ *  Driver for the Vitesse VSC9953 L2 Switch
+ */
+
+#include <asm/io.h>
+#include <asm/fsl_serdes.h>
+#include <fm_eth.h>
+#include <asm/fsl_memac.h>
+#include <vsc9953.h>
+
+static struct vsc9953_info vsc9953_l2sw = {
+		.port[0] = VSC9953_PORT_INFO_INITIALIZER(0),
+		.port[1] = VSC9953_PORT_INFO_INITIALIZER(1),
+		.port[2] = VSC9953_PORT_INFO_INITIALIZER(2),
+		.port[3] = VSC9953_PORT_INFO_INITIALIZER(3),
+		.port[4] = VSC9953_PORT_INFO_INITIALIZER(4),
+		.port[5] = VSC9953_PORT_INFO_INITIALIZER(5),
+		.port[6] = VSC9953_PORT_INFO_INITIALIZER(6),
+		.port[7] = VSC9953_PORT_INFO_INITIALIZER(7),
+		.port[8] = VSC9953_PORT_INFO_INITIALIZER(8),
+		.port[9] = VSC9953_PORT_INFO_INITIALIZER(9),
+};
+
+void vsc9953_port_info_set_mdio(int port, struct mii_dev *bus)
+{
+	if (!VSC9953_PORT_CHECK(port))
+		return;
+
+	vsc9953_l2sw.port[port].bus = bus;
+}
+
+void vsc9953_port_info_set_phy_address(int port, int address)
+{
+	if (!VSC9953_PORT_CHECK(port))
+		return;
+
+	vsc9953_l2sw.port[port].phyaddr = address;
+}
+
+void vsc9953_port_info_set_phy_int(int port, phy_interface_t phy_int)
+{
+	if (!VSC9953_PORT_CHECK(port))
+		return;
+
+	vsc9953_l2sw.port[port].enet_if = phy_int;
+}
+
+void vsc9953_port_enable(int port)
+{
+	if (!VSC9953_PORT_CHECK(port))
+		return;
+
+	vsc9953_l2sw.port[port].enabled = 1;
+}
+
+void vsc9953_port_disable(int port)
+{
+	if (!VSC9953_PORT_CHECK(port))
+		return;
+
+	vsc9953_l2sw.port[port].enabled = 0;
+}
+
+static void vsc9953_mdio_write(struct vsc9953_mii_mng *phyregs, int port_addr,
+		int regnum, int value)
+{
+	int			timeout = 50000;
+
+	out_le32(&phyregs->miimcmd, (0x1 << 31) | ((port_addr & 0x1f) << 25) |
+			((regnum & 0x1f) << 20) | ((value & 0xffff) << 4) |
+			(0x1 << 1));
+	asm("sync");
+
+	while ((in_le32(&phyregs->miimstatus) & 0x8) && --timeout)
+		udelay(1);
+
+	if (timeout == 0)
+		debug("Timeout waiting for MDIO write\n");
+}
+
+static int vsc9953_mdio_read(struct vsc9953_mii_mng *phyregs, int port_addr,
+		int regnum)
+{
+	int			value = 0xFFFF;
+	int			timeout = 50000;
+
+	while ((in_le32(&phyregs->miimstatus) & MIIMIND_OPR_PEND) && --timeout)
+		udelay(1);
+	if (timeout == 0) {
+		debug("Timeout waiting for MDIO operation to finish\n");
+		return value;
+	}
+
+	/* Put the address of the phy, and the register
+	 * number into MIICMD
+	 */
+	out_le32(&phyregs->miimcmd, (0x1 << 31) | ((port_addr & 0x1f) << 25) |
+			((regnum & 0x1f) << 20) | ((value & 0xffff) << 4) |
+			(0x2 << 1));
+
+	timeout = 50000;
+	/* Wait for the the indication that the read is done */
+	while ((in_le32(&phyregs->miimstatus) & 0x8) && --timeout)
+		udelay(1);
+	if (timeout == 0)
+		debug("Timeout waiting for MDIO read\n");
+
+	/* Grab the value read from the PHY */
+	value = in_le32(&phyregs->miimdata);
+
+	if ((value & 0x00030000) == 0)
+		return value & 0x0000ffff;
+
+	return value;
+}
+
+static int init_phy(struct eth_device *dev)
+{
+	struct vsc9953_port_info	*l2sw_port = dev->priv;
+	struct phy_device		*phydev = NULL;
+
+#ifdef CONFIG_PHYLIB
+	if (!l2sw_port->bus)
+		return 0;
+	phydev = phy_connect(l2sw_port->bus, l2sw_port->phyaddr, dev,
+			l2sw_port->enet_if);
+	if (!phydev) {
+		printf("Failed to connect\n");
+		return -1;
+	}
+
+	phydev->supported &= SUPPORTED_10baseT_Half |
+			SUPPORTED_10baseT_Full |
+			SUPPORTED_100baseT_Half |
+			SUPPORTED_100baseT_Full |
+			SUPPORTED_1000baseT_Full;
+	phydev->advertising = phydev->supported;
+
+	l2sw_port->phydev = phydev;
+
+	phy_config(phydev);
+#endif
+
+	return 0;
+}
+
+static int vsc9953_port_init(int port)
+{
+	struct eth_device		*dev;
+
+	/* Internal ports never have a PHY */
+	if (VSC9953_INTERNAL_PORT_CHECK(port))
+		return 0;
+
+	/* alloc eth device */
+	dev = (struct eth_device *)calloc(1, sizeof(struct eth_device));
+	if (!dev)
+		return 1;
+
+	sprintf(dev->name, "SW@PORT%d", port);
+	dev->priv = &vsc9953_l2sw.port[port];
+	dev->init = NULL;
+	dev->halt = NULL;
+	dev->send = NULL;
+	dev->recv = NULL;
+
+	if (init_phy(dev)) {
+		free(dev);
+		return 1;
+	}
+
+	return 0;
+}
+
+void vsc9953_init(bd_t *bis)
+{
+	u32				i, hdx_cfg = 0, phy_addr = 0;
+	int				timeout;
+	struct vsc9953_system_reg	*l2sys_reg;
+	struct vsc9953_qsys_reg		*l2qsys_reg;
+	struct vsc9953_dev_gmii		*l2dev_gmii_reg;
+	struct vsc9953_analyzer		*l2ana_reg;
+	struct vsc9953_devcpu_gcb	*l2dev_gcb;
+
+	l2dev_gmii_reg = (struct vsc9953_dev_gmii *)(VSC9953_OFFSET +
+			VSC9953_DEV_GMII_OFFSET);
+
+	l2ana_reg = (struct vsc9953_analyzer *)(VSC9953_OFFSET +
+			VSC9953_ANA_OFFSET);
+
+	l2sys_reg = (struct vsc9953_system_reg *)(VSC9953_OFFSET +
+			VSC9953_SYS_OFFSET);
+
+	l2qsys_reg = (struct vsc9953_qsys_reg *)(VSC9953_OFFSET +
+			VSC9953_QSYS_OFFSET);
+
+	l2dev_gcb = (struct vsc9953_devcpu_gcb *)(VSC9953_OFFSET +
+			VSC9953_DEVCPU_GCB);
+
+	out_le32(&l2dev_gcb->chip_regs.soft_rst,
+		 CONFIG_VSC9953_SOFT_SWC_RST_ENA);
+	timeout = 50000;
+	while ((in_le32(&l2dev_gcb->chip_regs.soft_rst) &
+			CONFIG_VSC9953_SOFT_SWC_RST_ENA) && --timeout)
+		udelay(1); /* busy wait for vsc9953 soft reset */
+	if (timeout == 0)
+		debug("Timeout waiting for VSC9953 to reset\n");
+
+	out_le32(&l2sys_reg->sys.reset_cfg, CONFIG_VSC9953_MEM_ENABLE |
+		 CONFIG_VSC9953_MEM_INIT);
+
+	timeout = 50000;
+	while ((in_le32(&l2sys_reg->sys.reset_cfg) &
+		CONFIG_VSC9953_MEM_INIT) && --timeout)
+		udelay(1); /* busy wait for vsc9953 memory init */
+	if (timeout == 0)
+		debug("Timeout waiting for VSC9953 memory to initialize\n");
+
+	out_le32(&l2sys_reg->sys.reset_cfg, (in_le32(&l2sys_reg->sys.reset_cfg)
+			| CONFIG_VSC9953_CORE_ENABLE));
+
+	/* VSC9953 Setting to be done once only */
+	out_le32(&l2qsys_reg->sys.ext_cpu_cfg, 0x00000b00);
+
+	for (i = 0; i < VSC9953_MAX_PORTS; i++) {
+		if (vsc9953_port_init(i))
+			printf("Failed to initialize l2switch port %d\n", i);
+
+		/* Enable VSC9953 GMII Ports Port ID 0 - 7 */
+		if (VSC9953_INTERNAL_PORT_CHECK(i)) {
+			out_le32(&l2ana_reg->pfc[i].pfc_cfg,
+				 CONFIG_VSC9953_PFC_FC_QSGMII);
+			out_le32(&l2sys_reg->pause_cfg.mac_fc_cfg[i],
+				 CONFIG_VSC9953_MAC_FC_CFG_QSGMII);
+		} else {
+			out_le32(&l2ana_reg->pfc[i].pfc_cfg,
+				 CONFIG_VSC9953_PFC_FC);
+			out_le32(&l2sys_reg->pause_cfg.mac_fc_cfg[i],
+				 CONFIG_VSC9953_MAC_FC_CFG);
+		}
+		out_le32(&l2dev_gmii_reg->port_mode.clock_cfg,
+			 CONFIG_VSC9953_CLOCK_CFG);
+		out_le32(&l2dev_gmii_reg->mac_cfg_status.mac_ena_cfg,
+			 CONFIG_VSC9953_MAC_ENA_CFG);
+		out_le32(&l2dev_gmii_reg->mac_cfg_status.mac_mode_cfg,
+			 CONFIG_VSC9953_MAC_MODE_CFG);
+		out_le32(&l2dev_gmii_reg->mac_cfg_status.mac_ifg_cfg,
+			 CONFIG_VSC9953_MAC_IFG_CFG);
+		/* mac_hdx_cfg varies with port id*/
+		hdx_cfg = (CONFIG_VSC9953_MAC_HDX_CFG | (i << 16));
+		out_le32(&l2dev_gmii_reg->mac_cfg_status.mac_hdx_cfg, hdx_cfg);
+		out_le32(&l2sys_reg->sys.front_port_mode[i],
+			 CONFIG_VSC9953_FRONT_PORT_MODE);
+		out_le32(&l2qsys_reg->sys.switch_port_mode[i],
+			 CONFIG_VSC9953_PORT_ENA);
+		out_le32(&l2dev_gmii_reg->mac_cfg_status.mac_maxlen_cfg,
+			 CONFIG_VSC9953_MAC_MAX_LEN);
+		out_le32(&l2sys_reg->pause_cfg.pause_cfg[i],
+			 CONFIG_VSC9953_PAUSE_CFG);
+		/* WAIT FOR 2 us*/
+		udelay(2);
+
+		l2dev_gmii_reg = (struct vsc9953_dev_gmii *)(
+				(char *)l2dev_gmii_reg
+				+ T1040_SWITCH_GMII_DEV_OFFSET);
+
+		/* Initialize Lynx PHY Wrappers */
+		phy_addr = 0;
+		if (vsc9953_l2sw.port[i].enet_if ==
+				PHY_INTERFACE_MODE_QSGMII)
+			phy_addr = (i + 0x4) & 0x1F;
+		else if (vsc9953_l2sw.port[i].enet_if ==
+				PHY_INTERFACE_MODE_SGMII)
+			phy_addr = (i + 1) & 0x1F;
+
+		if (phy_addr) {
+			/* SGMII IF mode + AN enable */
+			vsc9953_mdio_write(&l2dev_gcb->mii_mng[0], phy_addr,
+					   0x14, PHY_SGMII_IF_MODE_AN |
+					   PHY_SGMII_IF_MODE_SGMII);
+			/* Dev ability according to SGMII specification */
+			vsc9953_mdio_write(&l2dev_gcb->mii_mng[0], phy_addr,
+					   0x4, PHY_SGMII_DEV_ABILITY_SGMII);
+			/* Adjust link timer for SGMII
+			 * 1.6 ms in units of 8 ns = 2 * 10^5 = 0x30d40
+			 */
+			vsc9953_mdio_write(&l2dev_gcb->mii_mng[0], phy_addr,
+					   0x13, 0x0003);
+			vsc9953_mdio_write(&l2dev_gcb->mii_mng[0], phy_addr,
+					   0x12, 0x0d40);
+			/* Restart AN */
+			vsc9953_mdio_write(&l2dev_gcb->mii_mng[0], phy_addr,
+					   0x0, PHY_SGMII_CR_DEF_VAL |
+					   PHY_SGMII_CR_RESET_AN);
+
+			timeout = 50000;
+			while ((vsc9953_mdio_read(&l2dev_gcb->mii_mng[0],
+					phy_addr, 0x01) & 0x0020) && --timeout)
+				udelay(1); /* wait for AN to complete */
+			if (timeout == 0)
+				debug("Timeout waiting for AN to complete\n");
+		}
+	}
+
+	printf("VSC9953 L2 switch initialized\n");
+	return;
+}
+
+#ifdef CONFIG_VSC9953_CMD
+/* Enable/disable status of a VSC9953 port */
+static void vsc9953_port_status_set(int port_nr, u8 enabled)
+{
+	u32			val;
+	struct vsc9953_qsys_reg	*l2qsys_reg;
+
+	/* Administrative down */
+	if (vsc9953_l2sw.port[port_nr].enabled == 0)
+		return;
+
+	l2qsys_reg = (struct vsc9953_qsys_reg *)(VSC9953_OFFSET +
+			VSC9953_QSYS_OFFSET);
+
+	val = in_le32(&l2qsys_reg->sys.switch_port_mode[port_nr]);
+	if (enabled == 1)
+		val |= (1 << 13);
+	else
+		val &= ~(1 << 13);
+
+	out_le32(&l2qsys_reg->sys.switch_port_mode[port_nr], val);
+}
+
+/* Set all VSC9953 ports' status */
+static void vsc9953_port_all_status_set(u8 enabled)
+{
+	int		i;
+
+	for (i = 0; i < VSC9953_MAX_PORTS; i++)
+		vsc9953_port_status_set(i, enabled);
+}
+
+/* Start autonegotiation for a VSC9953 PHY */
+static void vsc9953_phy_autoneg(int port_nr)
+{
+	if (!vsc9953_l2sw.port[port_nr].phydev)
+		return;
+
+	if (vsc9953_l2sw.port[port_nr].phydev->drv->startup(
+			vsc9953_l2sw.port[port_nr].phydev))
+		printf("Failed to start PHY for port %d\n", port_nr);
+}
+
+/* Start autonegotiation for all VSC9953 PHYs */
+static void vsc9953_phy_all_autoneg(void)
+{
+	int		i;
+
+	for (i = 0; i < VSC9953_MAX_PORTS; i++)
+		vsc9953_phy_autoneg(i);
+}
+
+/* Print a VSC9953 port's configuration */
+static void vsc9953_port_config_show(int port)
+{
+	int			speed;
+	int			duplex;
+	int			link;
+	u8			enabled;
+	u32			val;
+	struct vsc9953_qsys_reg	*l2qsys_reg;
+
+	l2qsys_reg = (struct vsc9953_qsys_reg *)(VSC9953_OFFSET +
+			VSC9953_QSYS_OFFSET);
+
+	val = in_le32(&l2qsys_reg->sys.switch_port_mode[port]);
+	enabled = vsc9953_l2sw.port[port].enabled &
+			((val & 0x00002000) >> 13);
+
+	/* internal ports (8 and 9) are fixed */
+	if (VSC9953_INTERNAL_PORT_CHECK(port)) {
+		link = 1;
+		speed = SPEED_2500;
+		duplex = DUPLEX_FULL;
+	} else {
+		if (vsc9953_l2sw.port[port].phydev) {
+			link = vsc9953_l2sw.port[port].phydev->link;
+			speed = vsc9953_l2sw.port[port].phydev->speed;
+			duplex = vsc9953_l2sw.port[port].phydev->duplex;
+		} else {
+			link = -1;
+			speed = -1;
+			duplex = -1;
+		}
+	}
+
+	printf("%8d ", port);
+	printf("%8s ", enabled == 1 ? "enabled" : "disabled");
+	printf("%8s ", link == 1 ? "up" : "down");
+
+	switch (speed) {
+	case SPEED_10:
+		printf("%8d ", 10);
+		break;
+	case SPEED_100:
+		printf("%8d ", 100);
+		break;
+	case SPEED_1000:
+		printf("%8d ", 1000);
+		break;
+	case SPEED_2500:
+		printf("%8d ", 2500);
+		break;
+	case SPEED_10000:
+		printf("%8d ", 10000);
+		break;
+	default:
+		printf("%8s ", "-");
+	}
+
+	printf("%8s\n", duplex == DUPLEX_FULL ? "full" : "half");
+}
+
+/* Print VSC9953 ports' configuration */
+static void vsc9953_port_all_config_show(void)
+{
+	int		i;
+
+	for (i = 0; i < VSC9953_MAX_PORTS; i++)
+		vsc9953_port_config_show(i);
+}
+
+/* function to interpret commands starting with "ethsw " */
+static int do_ethsw(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	u8 enable;
+	u32 port;
+
+	if (argc < 4)
+		return -1;
+
+	if (strcmp(argv[1], "port"))
+		return -1;
+
+	if (!strcmp(argv[3], "show")) {
+		if (!strcmp(argv[2], "all")) {
+			vsc9953_phy_all_autoneg();
+			printf("%8s %8s %8s %8s %8s\n",
+			       "Port", "Status", "Link", "Speed",
+			       "Duplex");
+			vsc9953_port_all_config_show();
+			return 0;
+		} else {
+			port = simple_strtoul(argv[2], NULL, 10);
+			if (!VSC9953_PORT_CHECK(port))
+				return -1;
+			vsc9953_phy_autoneg(port);
+			printf("%8s %8s %8s %8s %8s\n",
+			       "Port", "Status", "Link", "Speed",
+			       "Duplex");
+			vsc9953_port_config_show(port);
+			return 0;
+		}
+	} else if (!strcmp(argv[3], "enable")) {
+		enable = 1;
+	} else if (!strcmp(argv[3], "disable")) {
+		enable = 0;
+	} else {
+		return -1;
+	}
+
+	if (!strcmp(argv[2], "all")) {
+		vsc9953_port_all_status_set(enable);
+		return 0;
+	} else {
+		port = simple_strtoul(argv[2], NULL, 10);
+		if (!VSC9953_PORT_CHECK(port))
+			return -1;
+		vsc9953_port_status_set(port, enable);
+		return 0;
+	}
+
+	return -1;
+}
+
+U_BOOT_CMD(ethsw, 5, 0, do_ethsw,
+	   "vsc9953 l2 switch commands",
+	   "port <port_nr> enable|disable\n"
+	   "    - enable/disable an l2 switch port\n"
+	   "      port_nr=0..9; use \"all\" for all ports\n"
+	   "ethsw port <port_nr> show\n"
+	   "    - show an l2 switch port's configuration\n"
+	   "      port_nr=0..9; use \"all\" for all ports\n"
+);
+#endif /* CONFIG_VSC9953_CMD */