/*
 * aQuantia Corporation Network Driver
 * Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 */

/* File hw_atl_utils.c: Definition of common functions for Atlantic hardware
 * abstraction layer.
 */

#include "../aq_hw.h"
#include "../aq_hw_utils.h"
#include "../aq_pci_func.h"
#include "../aq_ring.h"
#include "../aq_vec.h"
#include "hw_atl_utils.h"
#include "hw_atl_llh.h"

#include <linux/random.h>

#define HW_ATL_UCP_0X370_REG    0x0370U

#define HW_ATL_FW_SM_RAM        0x2U
#define HW_ATL_MPI_CONTROL_ADR  0x0368U
#define HW_ATL_MPI_STATE_ADR    0x036CU

#define HW_ATL_MPI_STATE_MSK    0x00FFU
#define HW_ATL_MPI_STATE_SHIFT  0U
#define HW_ATL_MPI_SPEED_MSK    0xFFFFU
#define HW_ATL_MPI_SPEED_SHIFT  16U

static int hw_atl_utils_fw_downld_dwords(struct aq_hw_s *self, u32 a,
					 u32 *p, u32 cnt)
{
	int err = 0;

	AQ_HW_WAIT_FOR(reg_glb_cpu_sem_get(self,
					   HW_ATL_FW_SM_RAM) == 1U,
					   1U, 10000U);

	if (err < 0) {
		bool is_locked;

		reg_glb_cpu_sem_set(self, 1U, HW_ATL_FW_SM_RAM);
		is_locked = reg_glb_cpu_sem_get(self, HW_ATL_FW_SM_RAM);
		if (!is_locked) {
			err = -ETIME;
			goto err_exit;
		}
	}

	aq_hw_write_reg(self, 0x00000208U, a);

	for (++cnt; --cnt;) {
		u32 i = 0U;

		aq_hw_write_reg(self, 0x00000200U, 0x00008000U);

		for (i = 1024U;
			(0x100U & aq_hw_read_reg(self, 0x00000200U)) && --i;) {
		}

		*(p++) = aq_hw_read_reg(self, 0x0000020CU);
	}

	reg_glb_cpu_sem_set(self, 1U, HW_ATL_FW_SM_RAM);

err_exit:
	return err;
}

static int hw_atl_utils_fw_upload_dwords(struct aq_hw_s *self, u32 a, u32 *p,
					 u32 cnt)
{
	int err = 0;
	bool is_locked;

	is_locked = reg_glb_cpu_sem_get(self, HW_ATL_FW_SM_RAM);
	if (!is_locked) {
		err = -ETIME;
		goto err_exit;
	}

	aq_hw_write_reg(self, 0x00000208U, a);

	for (++cnt; --cnt;) {
		u32 i = 0U;

		aq_hw_write_reg(self, 0x0000020CU, *(p++));
		aq_hw_write_reg(self, 0x00000200U, 0xC000U);

		for (i = 1024U;
			(0x100U & aq_hw_read_reg(self, 0x00000200U)) && --i;) {
		}
	}

	reg_glb_cpu_sem_set(self, 1U, HW_ATL_FW_SM_RAM);

err_exit:
	return err;
}

static int hw_atl_utils_ver_match(u32 ver_expected, u32 ver_actual)
{
	int err = 0;
	const u32 dw_major_mask = 0xff000000U;
	const u32 dw_minor_mask = 0x00ffffffU;

	err = (dw_major_mask & (ver_expected ^ ver_actual)) ? -EOPNOTSUPP : 0;
	if (err < 0)
		goto err_exit;
	err = ((dw_minor_mask & ver_expected) > (dw_minor_mask & ver_actual)) ?
		-EOPNOTSUPP : 0;
err_exit:
	return err;
}

static int hw_atl_utils_init_ucp(struct aq_hw_s *self,
				 struct aq_hw_caps_s *aq_hw_caps)
{
	int err = 0;

	if (!aq_hw_read_reg(self, 0x370U)) {
		unsigned int rnd = 0U;
		unsigned int ucp_0x370 = 0U;

		get_random_bytes(&rnd, sizeof(unsigned int));

		ucp_0x370 = 0x02020202U | (0xFEFEFEFEU & rnd);
		aq_hw_write_reg(self, HW_ATL_UCP_0X370_REG, ucp_0x370);
	}

	reg_glb_cpu_scratch_scp_set(self, 0x00000000U, 25U);

	/* check 10 times by 1ms */
	AQ_HW_WAIT_FOR(0U != (PHAL_ATLANTIC_A0->mbox_addr =
			aq_hw_read_reg(self, 0x360U)), 1000U, 10U);

	err = hw_atl_utils_ver_match(aq_hw_caps->fw_ver_expected,
				     aq_hw_read_reg(self, 0x18U));

	if (err < 0)
		pr_err("%s: Bad FW version detected: expected=%x, actual=%x\n",
		       AQ_CFG_DRV_NAME,
		       aq_hw_caps->fw_ver_expected,
		       aq_hw_read_reg(self, 0x18U));
	return err;
}

#define HW_ATL_RPC_CONTROL_ADR 0x0338U
#define HW_ATL_RPC_STATE_ADR   0x033CU

struct aq_hw_atl_utils_fw_rpc_tid_s {
	union {
		u32 val;
		struct {
			u16 tid;
			u16 len;
		};
	};
};

#define hw_atl_utils_fw_rpc_init(_H_) hw_atl_utils_fw_rpc_wait(_H_, NULL)

static int hw_atl_utils_fw_rpc_call(struct aq_hw_s *self, unsigned int rpc_size)
{
	int err = 0;
	struct aq_hw_atl_utils_fw_rpc_tid_s sw;

	if (!IS_CHIP_FEATURE(MIPS)) {
		err = -1;
		goto err_exit;
	}
	err = hw_atl_utils_fw_upload_dwords(self, PHAL_ATLANTIC->rpc_addr,
					    (u32 *)(void *)&PHAL_ATLANTIC->rpc,
					    (rpc_size + sizeof(u32) -
					    sizeof(u8)) / sizeof(u32));
	if (err < 0)
		goto err_exit;

	sw.tid = 0xFFFFU & (++PHAL_ATLANTIC->rpc_tid);
	sw.len = (u16)rpc_size;
	aq_hw_write_reg(self, HW_ATL_RPC_CONTROL_ADR, sw.val);

err_exit:
	return err;
}

static int hw_atl_utils_fw_rpc_wait(struct aq_hw_s *self,
				    struct hw_aq_atl_utils_fw_rpc **rpc)
{
	int err = 0;
	struct aq_hw_atl_utils_fw_rpc_tid_s sw;
	struct aq_hw_atl_utils_fw_rpc_tid_s fw;

	do {
		sw.val = aq_hw_read_reg(self, HW_ATL_RPC_CONTROL_ADR);

		PHAL_ATLANTIC->rpc_tid = sw.tid;

		AQ_HW_WAIT_FOR(sw.tid ==
				(fw.val =
				aq_hw_read_reg(self, HW_ATL_RPC_STATE_ADR),
				fw.tid), 1000U, 100U);
		if (err < 0)
			goto err_exit;

		if (fw.len == 0xFFFFU) {
			err = hw_atl_utils_fw_rpc_call(self, sw.len);
			if (err < 0)
				goto err_exit;
		}
	} while (sw.tid != fw.tid || 0xFFFFU == fw.len);
	if (err < 0)
		goto err_exit;

	if (rpc) {
		if (fw.len) {
			err =
			hw_atl_utils_fw_downld_dwords(self,
						      PHAL_ATLANTIC->rpc_addr,
						      (u32 *)(void *)
						      &PHAL_ATLANTIC->rpc,
						      (fw.len + sizeof(u32) -
						      sizeof(u8)) /
						      sizeof(u32));
			if (err < 0)
				goto err_exit;
		}

		*rpc = &PHAL_ATLANTIC->rpc;
	}

err_exit:
	return err;
}

static int hw_atl_utils_mpi_create(struct aq_hw_s *self,
				   struct aq_hw_caps_s *aq_hw_caps)
{
	int err = 0;

	err = hw_atl_utils_init_ucp(self, aq_hw_caps);
	if (err < 0)
		goto err_exit;

	err = hw_atl_utils_fw_rpc_init(self);
	if (err < 0)
		goto err_exit;

err_exit:
	return err;
}

int hw_atl_utils_mpi_read_mbox(struct aq_hw_s *self,
			       struct hw_aq_atl_utils_mbox_header *pmbox)
{
	return hw_atl_utils_fw_downld_dwords(self,
				      PHAL_ATLANTIC->mbox_addr,
				      (u32 *)(void *)pmbox,
				      sizeof(*pmbox) / sizeof(u32));
}

void hw_atl_utils_mpi_read_stats(struct aq_hw_s *self,
				 struct hw_aq_atl_utils_mbox *pmbox)
{
	int err = 0;

	err = hw_atl_utils_fw_downld_dwords(self,
					    PHAL_ATLANTIC->mbox_addr,
					    (u32 *)(void *)pmbox,
					    sizeof(*pmbox) / sizeof(u32));
	if (err < 0)
		goto err_exit;

	if (IS_CHIP_FEATURE(REVISION_A0)) {
		unsigned int mtu = self->aq_nic_cfg ?
					self->aq_nic_cfg->mtu : 1514U;
		pmbox->stats.ubrc = pmbox->stats.uprc * mtu;
		pmbox->stats.ubtc = pmbox->stats.uptc * mtu;
		pmbox->stats.dpc = atomic_read(&PHAL_ATLANTIC_A0->dpc);
	} else {
		pmbox->stats.dpc = reg_rx_dma_stat_counter7get(self);
	}

err_exit:;
}

int hw_atl_utils_mpi_set_speed(struct aq_hw_s *self, u32 speed,
			       enum hal_atl_utils_fw_state_e state)
{
	u32 ucp_0x368 = 0;

	ucp_0x368 = (speed << HW_ATL_MPI_SPEED_SHIFT) | state;
	aq_hw_write_reg(self, HW_ATL_MPI_CONTROL_ADR, ucp_0x368);

	return 0;
}

void hw_atl_utils_mpi_set(struct aq_hw_s *self,
			  enum hal_atl_utils_fw_state_e state, u32 speed)
{
	int err = 0;
	u32 transaction_id = 0;
	struct hw_aq_atl_utils_mbox_header mbox;

	if (state == MPI_RESET) {
		hw_atl_utils_mpi_read_mbox(self, &mbox);

		transaction_id = mbox.transaction_id;

		AQ_HW_WAIT_FOR(transaction_id !=
				(hw_atl_utils_mpi_read_mbox(self, &mbox),
				 mbox.transaction_id),
			       1000U, 100U);
		if (err < 0)
			goto err_exit;
	}

	err = hw_atl_utils_mpi_set_speed(self, speed, state);

err_exit:;
}

int hw_atl_utils_mpi_get_link_status(struct aq_hw_s *self)
{
	u32 cp0x036C = aq_hw_read_reg(self, HW_ATL_MPI_STATE_ADR);
	u32 link_speed_mask = cp0x036C >> HW_ATL_MPI_SPEED_SHIFT;
	struct aq_hw_link_status_s *link_status = &self->aq_link_status;

	if (!link_speed_mask) {
		link_status->mbps = 0U;
	} else {
		switch (link_speed_mask) {
		case HAL_ATLANTIC_RATE_10G:
			link_status->mbps = 10000U;
			break;

		case HAL_ATLANTIC_RATE_5G:
		case HAL_ATLANTIC_RATE_5GSR:
			link_status->mbps = 5000U;
			break;

		case HAL_ATLANTIC_RATE_2GS:
			link_status->mbps = 2500U;
			break;

		case HAL_ATLANTIC_RATE_1G:
			link_status->mbps = 1000U;
			break;

		case HAL_ATLANTIC_RATE_100M:
			link_status->mbps = 100U;
			break;

		default:
			return -EBUSY;
		}
	}

	return 0;
}

int hw_atl_utils_get_mac_permanent(struct aq_hw_s *self,
				   struct aq_hw_caps_s *aq_hw_caps,
				   u8 *mac)
{
	int err = 0;
	u32 h = 0U;
	u32 l = 0U;
	u32 mac_addr[2];

	self->mmio = aq_pci_func_get_mmio(self->aq_pci_func);

	hw_atl_utils_hw_chip_features_init(self,
					   &PHAL_ATLANTIC_A0->chip_features);

	err = hw_atl_utils_mpi_create(self, aq_hw_caps);
	if (err < 0)
		goto err_exit;

	if (!aq_hw_read_reg(self, HW_ATL_UCP_0X370_REG)) {
		unsigned int rnd = 0;
		unsigned int ucp_0x370 = 0;

		get_random_bytes(&rnd, sizeof(unsigned int));

		ucp_0x370 = 0x02020202 | (0xFEFEFEFE & rnd);
		aq_hw_write_reg(self, HW_ATL_UCP_0X370_REG, ucp_0x370);
	}

	err = hw_atl_utils_fw_downld_dwords(self,
					    aq_hw_read_reg(self, 0x00000374U) +
					    (40U * 4U),
					    mac_addr,
					    AQ_DIMOF(mac_addr));
	if (err < 0) {
		mac_addr[0] = 0U;
		mac_addr[1] = 0U;
		err = 0;
	} else {
		mac_addr[0] = __swab32(mac_addr[0]);
		mac_addr[1] = __swab32(mac_addr[1]);
	}

	ether_addr_copy(mac, (u8 *)mac_addr);

	if ((mac[0] & 0x01U) || ((mac[0] | mac[1] | mac[2]) == 0x00U)) {
		/* chip revision */
		l = 0xE3000000U
			| (0xFFFFU & aq_hw_read_reg(self, HW_ATL_UCP_0X370_REG))
			| (0x00 << 16);
		h = 0x8001300EU;

		mac[5] = (u8)(0xFFU & l);
		l >>= 8;
		mac[4] = (u8)(0xFFU & l);
		l >>= 8;
		mac[3] = (u8)(0xFFU & l);
		l >>= 8;
		mac[2] = (u8)(0xFFU & l);
		mac[1] = (u8)(0xFFU & h);
		h >>= 8;
		mac[0] = (u8)(0xFFU & h);
	}

err_exit:
	return err;
}

unsigned int hw_atl_utils_mbps_2_speed_index(unsigned int mbps)
{
	unsigned int ret = 0U;

	switch (mbps) {
	case 100U:
		ret = 5U;
		break;

	case 1000U:
		ret = 4U;
		break;

	case 2500U:
		ret = 3U;
		break;

	case 5000U:
		ret = 1U;
		break;

	case 10000U:
		ret = 0U;
		break;

	default:
		break;
	}
	return ret;
}

void hw_atl_utils_hw_chip_features_init(struct aq_hw_s *self, u32 *p)
{
	u32 chip_features = 0U;
	u32 val = reg_glb_mif_id_get(self);
	u32 mif_rev = val & 0xFFU;

	if ((3U & mif_rev) == 1U) {
		chip_features |=
			HAL_ATLANTIC_UTILS_CHIP_REVISION_A0 |
			HAL_ATLANTIC_UTILS_CHIP_MPI_AQ |
			HAL_ATLANTIC_UTILS_CHIP_MIPS;
	} else if ((3U & mif_rev) == 2U) {
		chip_features |=
			HAL_ATLANTIC_UTILS_CHIP_REVISION_B0 |
			HAL_ATLANTIC_UTILS_CHIP_MPI_AQ |
			HAL_ATLANTIC_UTILS_CHIP_MIPS |
			HAL_ATLANTIC_UTILS_CHIP_TPO2 |
			HAL_ATLANTIC_UTILS_CHIP_RPF2;
	}

	*p = chip_features;
}

int hw_atl_utils_hw_deinit(struct aq_hw_s *self)
{
	hw_atl_utils_mpi_set(self, MPI_DEINIT, 0x0U);
	return 0;
}

int hw_atl_utils_hw_set_power(struct aq_hw_s *self,
			      unsigned int power_state)
{
	hw_atl_utils_mpi_set(self, MPI_POWER, 0x0U);
	return 0;
}

int hw_atl_utils_update_stats(struct aq_hw_s *self)
{
	struct hw_atl_s *hw_self = PHAL_ATLANTIC;
	struct hw_aq_atl_utils_mbox mbox;

	if (!self->aq_link_status.mbps)
		return 0;

	hw_atl_utils_mpi_read_stats(self, &mbox);

#define AQ_SDELTA(_N_) (hw_self->curr_stats._N_ += \
			mbox.stats._N_ - hw_self->last_stats._N_)

	AQ_SDELTA(uprc);
	AQ_SDELTA(mprc);
	AQ_SDELTA(bprc);
	AQ_SDELTA(erpt);

	AQ_SDELTA(uptc);
	AQ_SDELTA(mptc);
	AQ_SDELTA(bptc);
	AQ_SDELTA(erpr);

	AQ_SDELTA(ubrc);
	AQ_SDELTA(ubtc);
	AQ_SDELTA(mbrc);
	AQ_SDELTA(mbtc);
	AQ_SDELTA(bbrc);
	AQ_SDELTA(bbtc);
	AQ_SDELTA(dpc);

#undef AQ_SDELTA

	memcpy(&hw_self->last_stats, &mbox.stats, sizeof(mbox.stats));

	return 0;
}

int hw_atl_utils_get_hw_stats(struct aq_hw_s *self,
			      u64 *data, unsigned int *p_count)
{
	struct hw_atl_s *hw_self = PHAL_ATLANTIC;
	struct hw_atl_stats_s *stats = &hw_self->curr_stats;
	int i = 0;

	data[i] = stats->uprc + stats->mprc + stats->bprc;
	data[++i] = stats->uprc;
	data[++i] = stats->mprc;
	data[++i] = stats->bprc;
	data[++i] = stats->erpt;
	data[++i] = stats->uptc + stats->mptc + stats->bptc;
	data[++i] = stats->uptc;
	data[++i] = stats->mptc;
	data[++i] = stats->bptc;
	data[++i] = stats->ubrc;
	data[++i] = stats->ubtc;
	data[++i] = stats->mbrc;
	data[++i] = stats->mbtc;
	data[++i] = stats->bbrc;
	data[++i] = stats->bbtc;
	data[++i] = stats->ubrc + stats->mbrc + stats->bbrc;
	data[++i] = stats->ubtc + stats->mbtc + stats->bbtc;
	data[++i] = stats_rx_dma_good_pkt_counterlsw_get(self);
	data[++i] = stats_tx_dma_good_pkt_counterlsw_get(self);
	data[++i] = stats_rx_dma_good_octet_counterlsw_get(self);
	data[++i] = stats_tx_dma_good_octet_counterlsw_get(self);
	data[++i] = stats->dpc;

	if (p_count)
		*p_count = ++i;

	return 0;
}

static const u32 hw_atl_utils_hw_mac_regs[] = {
	0x00005580U, 0x00005590U, 0x000055B0U, 0x000055B4U,
	0x000055C0U, 0x00005B00U, 0x00005B04U, 0x00005B08U,
	0x00005B0CU, 0x00005B10U, 0x00005B14U, 0x00005B18U,
	0x00005B1CU, 0x00005B20U, 0x00005B24U, 0x00005B28U,
	0x00005B2CU, 0x00005B30U, 0x00005B34U, 0x00005B38U,
	0x00005B3CU, 0x00005B40U, 0x00005B44U, 0x00005B48U,
	0x00005B4CU, 0x00005B50U, 0x00005B54U, 0x00005B58U,
	0x00005B5CU, 0x00005B60U, 0x00005B64U, 0x00005B68U,
	0x00005B6CU, 0x00005B70U, 0x00005B74U, 0x00005B78U,
	0x00005B7CU, 0x00007C00U, 0x00007C04U, 0x00007C08U,
	0x00007C0CU, 0x00007C10U, 0x00007C14U, 0x00007C18U,
	0x00007C1CU, 0x00007C20U, 0x00007C40U, 0x00007C44U,
	0x00007C48U, 0x00007C4CU, 0x00007C50U, 0x00007C54U,
	0x00007C58U, 0x00007C5CU, 0x00007C60U, 0x00007C80U,
	0x00007C84U, 0x00007C88U, 0x00007C8CU, 0x00007C90U,
	0x00007C94U, 0x00007C98U, 0x00007C9CU, 0x00007CA0U,
	0x00007CC0U, 0x00007CC4U, 0x00007CC8U, 0x00007CCCU,
	0x00007CD0U, 0x00007CD4U, 0x00007CD8U, 0x00007CDCU,
	0x00007CE0U, 0x00000300U, 0x00000304U, 0x00000308U,
	0x0000030cU, 0x00000310U, 0x00000314U, 0x00000318U,
	0x0000031cU, 0x00000360U, 0x00000364U, 0x00000368U,
	0x0000036cU, 0x00000370U, 0x00000374U, 0x00006900U,
};

int hw_atl_utils_hw_get_regs(struct aq_hw_s *self,
			     struct aq_hw_caps_s *aq_hw_caps,
			     u32 *regs_buff)
{
	unsigned int i = 0U;

	for (i = 0; i < aq_hw_caps->mac_regs_count; i++)
		regs_buff[i] = aq_hw_read_reg(self,
			hw_atl_utils_hw_mac_regs[i]);
	return 0;
}

int hw_atl_utils_get_fw_version(struct aq_hw_s *self, u32 *fw_version)
{
	*fw_version = aq_hw_read_reg(self, 0x18U);
	return 0;
}