// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
 * Copyright (c) 2019 Microsemi Corporation
 */

#include <config.h>
#include <dm.h>
#include <malloc.h>
#include <dm/of_access.h>
#include <dm/of_addr.h>
#include <fdt_support.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <miiphy.h>
#include <net.h>
#include <wait_bit.h>
#include <linux/printk.h>

#include "mscc_xfer.h"
#include "mscc_miim.h"

#define PHY_CFG				0x0
#define PHY_CFG_ENA				0x3
#define PHY_CFG_COMMON_RST			BIT(2)
#define PHY_CFG_RST				(0x3 << 3)
#define PHY_STAT			0x4
#define PHY_STAT_SUPERVISOR_COMPLETE		BIT(0)

#define ANA_AC_RAM_CTRL_RAM_INIT		0x14fdc
#define ANA_AC_STAT_GLOBAL_CFG_PORT_RESET	0x15474

#define ANA_CL_PORT_VLAN_CFG(x)			(0xa018 + 0xc8 * (x))
#define		ANA_CL_PORT_VLAN_CFG_AWARE_ENA			BIT(19)
#define		ANA_CL_PORT_VLAN_CFG_POP_CNT(x)			((x) << 17)

#define ANA_L2_COMMON_FWD_CFG			0x18498
#define		ANA_L2_COMMON_FWD_CFG_CPU_DMAC_COPY_ENA	BIT(6)

#define ASM_CFG_STAT_CFG			0xb08
#define ASM_CFG_PORT(x)				(0xb74 + 0x4 * (x))
#define		ASM_CFG_PORT_NO_PREAMBLE_ENA		BIT(8)
#define		ASM_CFG_PORT_INJ_FORMAT_CFG(x)		((x) << 1)
#define ASM_RAM_CTRL_RAM_INIT			0xbfc

#define DEV_DEV_CFG_DEV_RST_CTRL	0x0
#define		DEV_DEV_CFG_DEV_RST_CTRL_SPEED_SEL(x)	((x) << 20)
#define DEV_MAC_CFG_MAC_ENA		0x24
#define		DEV_MAC_CFG_MAC_ENA_RX_ENA		BIT(4)
#define		DEV_MAC_CFG_MAC_ENA_TX_ENA		BIT(0)
#define DEV_MAC_CFG_MAC_IFG		0x3c
#define		DEV_MAC_CFG_MAC_IFG_TX_IFG(x)		((x) << 8)
#define		DEV_MAC_CFG_MAC_IFG_RX_IFG2(x)		((x) << 4)
#define		DEV_MAC_CFG_MAC_IFG_RX_IFG1(x)		(x)
#define DEV_PCS1G_CFG_PCS1G_CFG		0x48
#define		DEV_PCS1G_CFG_PCS1G_CFG_PCS_ENA		BIT(0)
#define DEV_PCS1G_CFG_PCS1G_MODE	0x4c
#define DEV_PCS1G_CFG_PCS1G_SD		0x50
#define DEV_PCS1G_CFG_PCS1G_ANEG	0x54
#define		DEV_PCS1G_CFG_PCS1G_ANEG_ADV_ABILITY(x)	((x) << 16)

#define LRN_COMMON_ACCESS_CTRL			0x0
#define		LRN_COMMON_ACCESS_CTRL_MAC_TABLE_ACCESS_SHOT	BIT(0)
#define LRN_COMMON_MAC_ACCESS_CFG0		0x4
#define LRN_COMMON_MAC_ACCESS_CFG1		0x8
#define LRN_COMMON_MAC_ACCESS_CFG2		0xc
#define		LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_ADDR(x)	(x)
#define		LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_TYPE(x)	((x) << 12)
#define		LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_VLD	BIT(15)
#define		LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_LOCKED	BIT(16)
#define		LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_CPU_COPY	BIT(23)
#define		LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_CPU_QU(x)	((x) << 24)

#define QFWD_SYSTEM_SWITCH_PORT_MODE(x)		(0x4400 + 0x4 * (x))
#define		QFWD_SYSTEM_SWITCH_PORT_MODE_PORT_ENA		BIT(17)

#define QS_XTR_GRP_CFG(x)		(4 * (x))
#define QS_INJ_GRP_CFG(x)		(0x24 + (x) * 4)

#define QSYS_SYSTEM_RESET_CFG			0x1048
#define QSYS_CALCFG_CAL_AUTO			0x1134
#define QSYS_CALCFG_CAL_CTRL			0x113c
#define		QSYS_CALCFG_CAL_CTRL_CAL_MODE(x)		((x) << 11)
#define QSYS_RAM_CTRL_RAM_INIT			0x1140

#define REW_RAM_CTRL_RAM_INIT			0xFFF4

#define MAC_VID			0
#define CPU_PORT		11
#define IFH_LEN			7
#define PGID_BROADCAST		50
#define PGID_UNICAST		51

static const char * const regs_names[] = {
	"port0", "port1",
	"ana_ac", "ana_cl", "ana_l2", "asm", "lrn", "qfwd", "qs", "qsys", "rew",
};

#define REGS_NAMES_COUNT ARRAY_SIZE(regs_names) + 1
#define MAX_PORT 2

enum servalt_ctrl_regs {
	ANA_AC = MAX_PORT,
	ANA_CL,
	ANA_L2,
	ASM,
	LRN,
	QFWD,
	QS,
	QSYS,
	REW,
};

#define SERVALT_MIIM_BUS_COUNT 2

struct servalt_phy_port_t {
	size_t phy_addr;
	struct mii_dev *bus;
};

struct servalt_private {
	void __iomem *regs[REGS_NAMES_COUNT];
	struct mii_dev *bus[SERVALT_MIIM_BUS_COUNT];
	struct servalt_phy_port_t ports[MAX_PORT];
};

static const unsigned long servalt_regs_qs[] = {
	[MSCC_QS_XTR_RD] = 0x8,
	[MSCC_QS_XTR_FLUSH] = 0x18,
	[MSCC_QS_XTR_DATA_PRESENT] = 0x1c,
	[MSCC_QS_INJ_WR] = 0x2c,
	[MSCC_QS_INJ_CTRL] = 0x34,
};

static struct mscc_miim_dev miim[SERVALT_MIIM_BUS_COUNT];
static int miim_count = -1;

static void mscc_phy_reset(void)
{
	writel(0, BASE_DEVCPU_GCB + GCB_PHY_CFG + PHY_CFG);
	writel(PHY_CFG_RST | PHY_CFG_COMMON_RST
	       | PHY_CFG_ENA, BASE_DEVCPU_GCB + GCB_PHY_CFG + PHY_CFG);
	if (wait_for_bit_le32((const void *)(BASE_DEVCPU_GCB + GCB_PHY_CFG) +
			      PHY_STAT, PHY_STAT_SUPERVISOR_COMPLETE,
			      true, 2000, false)) {
		pr_err("Timeout in phy reset\n");
	}
}

static void servalt_cpu_capture_setup(struct servalt_private *priv)
{
	/* ASM: No preamble and IFH prefix on CPU injected frames */
	writel(ASM_CFG_PORT_NO_PREAMBLE_ENA |
	       ASM_CFG_PORT_INJ_FORMAT_CFG(1),
	       priv->regs[ASM] + ASM_CFG_PORT(CPU_PORT));

	/* Set Manual injection via DEVCPU_QS registers for CPU queue 0 */
	writel(0x5, priv->regs[QS] + QS_INJ_GRP_CFG(0));

	/* Set Manual extraction via DEVCPU_QS registers for CPU queue 0 */
	writel(0x7, priv->regs[QS] + QS_XTR_GRP_CFG(0));

	/* Enable CPU port for any frame transfer */
	setbits_le32(priv->regs[QFWD] + QFWD_SYSTEM_SWITCH_PORT_MODE(CPU_PORT),
		     QFWD_SYSTEM_SWITCH_PORT_MODE_PORT_ENA);

	/* Send a copy to CPU when found as forwarding entry */
	setbits_le32(priv->regs[ANA_L2] + ANA_L2_COMMON_FWD_CFG,
		     ANA_L2_COMMON_FWD_CFG_CPU_DMAC_COPY_ENA);
}

static void servalt_port_init(struct servalt_private *priv, int port)
{
	void __iomem *regs = priv->regs[port];

	/* Enable PCS */
	writel(DEV_PCS1G_CFG_PCS1G_CFG_PCS_ENA,
	       regs + DEV_PCS1G_CFG_PCS1G_CFG);

	/* Disable Signal Detect */
	writel(0, regs + DEV_PCS1G_CFG_PCS1G_SD);

	/* Enable MAC RX and TX */
	writel(DEV_MAC_CFG_MAC_ENA_RX_ENA |
	       DEV_MAC_CFG_MAC_ENA_TX_ENA,
	       regs + DEV_MAC_CFG_MAC_ENA);

	/* Clear sgmii_mode_ena */
	writel(0, regs + DEV_PCS1G_CFG_PCS1G_MODE);

	/*
	 * Clear sw_resolve_ena(bit 0) and set adv_ability to
	 * something meaningful just in case
	 */
	writel(DEV_PCS1G_CFG_PCS1G_ANEG_ADV_ABILITY(0x20),
	       regs + DEV_PCS1G_CFG_PCS1G_ANEG);

	/* Set MAC IFG Gaps */
	writel(DEV_MAC_CFG_MAC_IFG_TX_IFG(4) |
	       DEV_MAC_CFG_MAC_IFG_RX_IFG1(5) |
	       DEV_MAC_CFG_MAC_IFG_RX_IFG2(1),
	       regs + DEV_MAC_CFG_MAC_IFG);

	/* Set link speed and release all resets */
	writel(DEV_DEV_CFG_DEV_RST_CTRL_SPEED_SEL(2),
	       regs + DEV_DEV_CFG_DEV_RST_CTRL);

	/* Make VLAN aware for CPU traffic */
	writel(ANA_CL_PORT_VLAN_CFG_AWARE_ENA |
	       ANA_CL_PORT_VLAN_CFG_POP_CNT(1) |
	       MAC_VID,
	       priv->regs[ANA_CL] + ANA_CL_PORT_VLAN_CFG(port));

	/* Enable CPU port for any frame transfer */
	setbits_le32(priv->regs[QFWD] + QFWD_SYSTEM_SWITCH_PORT_MODE(port),
		     QFWD_SYSTEM_SWITCH_PORT_MODE_PORT_ENA);
}

static int ram_init(u32 val, void __iomem *addr)
{
	writel(val, addr);

	if (wait_for_bit_le32(addr, BIT(1), false, 2000, false)) {
		printf("Timeout in memory reset, reg = 0x%08x\n", val);
		return 1;
	}

	return 0;
}

static int servalt_switch_init(struct servalt_private *priv)
{
	/* Initialize memories */
	ram_init(0x3, priv->regs[QSYS] + QSYS_RAM_CTRL_RAM_INIT);
	ram_init(0x3, priv->regs[ASM] + ASM_RAM_CTRL_RAM_INIT);
	ram_init(0x3, priv->regs[ANA_AC] + ANA_AC_RAM_CTRL_RAM_INIT);
	ram_init(0x3, priv->regs[REW] + REW_RAM_CTRL_RAM_INIT);

	/* Reset counters */
	writel(0x1, priv->regs[ANA_AC] + ANA_AC_STAT_GLOBAL_CFG_PORT_RESET);
	writel(0x1, priv->regs[ASM] + ASM_CFG_STAT_CFG);

	/* Enable switch-core and queue system */
	writel(0x1, priv->regs[QSYS] + QSYS_SYSTEM_RESET_CFG);

	return 0;
}

static void servalt_switch_config(struct servalt_private *priv)
{
	writel(0x55555555, priv->regs[QSYS] + QSYS_CALCFG_CAL_AUTO);

	writel(readl(priv->regs[QSYS] + QSYS_CALCFG_CAL_CTRL) |
	       QSYS_CALCFG_CAL_CTRL_CAL_MODE(8),
	       priv->regs[QSYS] + QSYS_CALCFG_CAL_CTRL);
}

static int servalt_initialize(struct servalt_private *priv)
{
	int ret, i;

	/* Initialize switch memories, enable core */
	ret = servalt_switch_init(priv);
	if (ret)
		return ret;

	servalt_switch_config(priv);

	for (i = 0; i < MAX_PORT; i++)
		servalt_port_init(priv, i);

	servalt_cpu_capture_setup(priv);

	return 0;
}

static inline
int servalt_vlant_wait_for_completion(struct servalt_private *priv)
{
	if (wait_for_bit_le32(priv->regs[LRN] + LRN_COMMON_ACCESS_CTRL,
			      LRN_COMMON_ACCESS_CTRL_MAC_TABLE_ACCESS_SHOT,
			      false, 2000, false))
		return -ETIMEDOUT;

	return 0;
}

static int servalt_mac_table_add(struct servalt_private *priv,
				 const unsigned char mac[ETH_ALEN], int pgid)
{
	u32 macl = 0, mach = 0;

	/*
	 * Set the MAC address to handle and the vlan associated in a format
	 * understood by the hardware.
	 */
	mach |= MAC_VID << 16;
	mach |= ((u32)mac[0]) << 8;
	mach |= ((u32)mac[1]) << 0;
	macl |= ((u32)mac[2]) << 24;
	macl |= ((u32)mac[3]) << 16;
	macl |= ((u32)mac[4]) << 8;
	macl |= ((u32)mac[5]) << 0;

	writel(mach, priv->regs[LRN] + LRN_COMMON_MAC_ACCESS_CFG0);
	writel(macl, priv->regs[LRN] + LRN_COMMON_MAC_ACCESS_CFG1);

	writel(LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_ADDR(pgid) |
	       LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_TYPE(0x3) |
	       LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_CPU_COPY |
	       LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_CPU_QU(0) |
	       LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_VLD |
	       LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_LOCKED,
	       priv->regs[LRN] + LRN_COMMON_MAC_ACCESS_CFG2);

	writel(LRN_COMMON_ACCESS_CTRL_MAC_TABLE_ACCESS_SHOT,
	       priv->regs[LRN] + LRN_COMMON_ACCESS_CTRL);

	return servalt_vlant_wait_for_completion(priv);
}

static int servalt_write_hwaddr(struct udevice *dev)
{
	struct servalt_private *priv = dev_get_priv(dev);
	struct eth_pdata *pdata = dev_get_plat(dev);

	return servalt_mac_table_add(priv, pdata->enetaddr, PGID_UNICAST);
}

static int servalt_start(struct udevice *dev)
{
	struct servalt_private *priv = dev_get_priv(dev);
	struct eth_pdata *pdata = dev_get_plat(dev);
	const unsigned char mac[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff,
		0xff };
	int ret;

	ret = servalt_initialize(priv);
	if (ret)
		return ret;

	/* Set MAC address tables entries for CPU redirection */
	ret = servalt_mac_table_add(priv, mac, PGID_BROADCAST);
	if (ret)
		return ret;

	ret = servalt_mac_table_add(priv, pdata->enetaddr, PGID_UNICAST);
	if (ret)
		return ret;

	return 0;
}

static void servalt_stop(struct udevice *dev)
{
}

static int servalt_send(struct udevice *dev, void *packet, int length)
{
	struct servalt_private *priv = dev_get_priv(dev);
	u32 ifh[IFH_LEN];
	u32 *buf = packet;

	memset(ifh, '\0', IFH_LEN * 4);

	/* Set DST PORT_MASK */
	ifh[0] = htonl(0);
	ifh[1] = htonl(0x1FFFFF);
	ifh[2] = htonl(~0);
	/* Set DST_MODE to INJECT and UPDATE_FCS */
	ifh[5] = htonl(0x4c0);

	return mscc_send(priv->regs[QS], servalt_regs_qs,
			 ifh, IFH_LEN, buf, length);
}

static int servalt_recv(struct udevice *dev, int flags, uchar **packetp)
{
	struct servalt_private *priv = dev_get_priv(dev);
	u32 *rxbuf = (u32 *)net_rx_packets[0];
	int byte_cnt = 0;

	byte_cnt = mscc_recv(priv->regs[QS], servalt_regs_qs, rxbuf, IFH_LEN,
			     false);

	*packetp = net_rx_packets[0];

	return byte_cnt;
}

static struct mii_dev *get_mdiobus(phys_addr_t base, unsigned long size)
{
	int i = 0;

	for (i = 0; i < SERVALT_MIIM_BUS_COUNT; ++i)
		if (miim[i].miim_base == base && miim[i].miim_size == size)
			return miim[i].bus;

	return NULL;
}

static void add_port_entry(struct servalt_private *priv, size_t index,
			   size_t phy_addr, struct mii_dev *bus)
{
	priv->ports[index].phy_addr = phy_addr;
	priv->ports[index].bus = bus;
}

static int servalt_probe(struct udevice *dev)
{
	struct servalt_private *priv = dev_get_priv(dev);
	int i;
	struct resource res;
	phys_addr_t addr_base;
	unsigned long addr_size;
	ofnode eth_node, node, mdio_node;
	size_t phy_addr;
	struct mii_dev *bus;
	struct ofnode_phandle_args phandle;

	if (!priv)
		return -EINVAL;

	/* Get registers and map them to the private structure */
	for (i = 0; i < ARRAY_SIZE(regs_names); i++) {
		priv->regs[i] = dev_remap_addr_name(dev, regs_names[i]);
		if (!priv->regs[i]) {
			debug
			    ("Error can't get regs base addresses for %s\n",
			     regs_names[i]);
			return -ENOMEM;
		}
	}

	/* Initialize miim buses */
	memset(&miim, 0x0, sizeof(struct mscc_miim_dev) *
	       SERVALT_MIIM_BUS_COUNT);

	/* iterate all the ports and find out on which bus they are */
	i = 0;
	eth_node = dev_read_first_subnode(dev);
	for (node = ofnode_first_subnode(eth_node);
	     ofnode_valid(node);
	     node = ofnode_next_subnode(node)) {
		if (ofnode_read_resource(node, 0, &res))
			return -ENOMEM;
		i = res.start;

		ofnode_parse_phandle_with_args(node, "phy-handle", NULL, 0, 0,
					       &phandle);

		/* Get phy address on mdio bus */
		if (ofnode_read_resource(phandle.node, 0, &res))
			return -ENOMEM;
		phy_addr = res.start;

		/* Get mdio node */
		mdio_node = ofnode_get_parent(phandle.node);

		if (ofnode_read_resource(mdio_node, 0, &res))
			return -ENOMEM;

		addr_base = res.start;
		addr_size = res.end - res.start;

		/* If the bus is new then create a new bus */
		if (!get_mdiobus(addr_base, addr_size))
			priv->bus[miim_count] =
				mscc_mdiobus_init(miim, &miim_count, addr_base,
						  addr_size);

		/* Connect mdio bus with the port */
		bus = get_mdiobus(addr_base, addr_size);
		add_port_entry(priv, i, phy_addr, bus);
	}

	mscc_phy_reset();

	for (i = 0; i < MAX_PORT; i++) {
		if (!priv->ports[i].bus)
			continue;

		phy_connect(priv->ports[i].bus, priv->ports[i].phy_addr, dev,
			    PHY_INTERFACE_MODE_NA);
	}

	return 0;
}

static int servalt_remove(struct udevice *dev)
{
	struct servalt_private *priv = dev_get_priv(dev);
	int i;

	for (i = 0; i < SERVALT_MIIM_BUS_COUNT; i++) {
		mdio_unregister(priv->bus[i]);
		mdio_free(priv->bus[i]);
	}

	return 0;
}

static const struct eth_ops servalt_ops = {
	.start        = servalt_start,
	.stop         = servalt_stop,
	.send         = servalt_send,
	.recv         = servalt_recv,
	.write_hwaddr = servalt_write_hwaddr,
};

static const struct udevice_id mscc_servalt_ids[] = {
	{.compatible = "mscc,vsc7437-switch" },
	{ /* Sentinel */ }
};

U_BOOT_DRIVER(servalt) = {
	.name				= "servalt-switch",
	.id				= UCLASS_ETH,
	.of_match			= mscc_servalt_ids,
	.probe				= servalt_probe,
	.remove				= servalt_remove,
	.ops				= &servalt_ops,
	.priv_auto		= sizeof(struct servalt_private),
	.plat_auto	= sizeof(struct eth_pdata),
};
