/*
 * Copyright (c) 2015 Intel Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef DRIVERS_ETHERNET_ETH_DW_PRIV_H_
#define DRIVERS_ETHERNET_ETH_DW_PRIV_H_

#ifdef CONFIG_PCI
#include <pci/pci.h>
#include <pci/pci_mgr.h>
#endif /* CONFIG_PCI */

#include <misc/util.h>

#include "contiki/ip/uip.h"

typedef void (*eth_config_irq_t)(struct device *port);

struct eth_config {
	uint32_t base_addr;
	uint32_t irq_num;
#ifdef CONFIG_PCI
	struct pci_dev_info pci_dev;
#endif  /* CONFIG_PCI */
	eth_config_irq_t config_func;

#ifdef CONFIG_ETH_DW_SHARED_IRQ
	char *shared_irq_dev_name;
#endif  /* CONFIG_ETH_DW_SHARED_IRQ */
};

/* Refer to Intel Quark SoC X1000 Datasheet, Chapter 15 for more details on
 * Ethernet device operation.
 *
 * This driver puts the Ethernet device into a very simple and space-efficient
 * mode of operation.  It only allocates a single packet descriptor for each of
 * the transmit and receive directions, computes checksums on the CPU, and
 * enables store-and-forward mode for both transmit and receive directions.
 */

/* Transmit descriptor */
struct eth_tx_desc {
	/* First word of transmit descriptor */
	union {
		struct {
			/* Only valid in half-duplex mode. */
			uint32_t deferred_bit      : 1;
			uint32_t err_underflow     : 1;
			uint32_t err_excess_defer  : 1;
			uint32_t coll_cnt_slot_num : 4;
			uint32_t vlan_frm          : 1;
			uint32_t err_excess_coll   : 1;
			uint32_t err_late_coll     : 1;
			uint32_t err_no_carrier    : 1;
			uint32_t err_carrier_loss  : 1;
			uint32_t err_ip_payload    : 1;
			uint32_t err_frm_flushed   : 1;
			uint32_t err_jabber_tout   : 1;
			/* OR of all other error bits. */
			uint32_t err_summary       : 1;
			uint32_t err_ip_hdr        : 1;
			uint32_t tx_timestamp_stat : 1;
			uint32_t vlan_ins_ctrl     : 2;
			uint32_t addr2_chained     : 1;
			uint32_t tx_end_of_ring    : 1;
			uint32_t chksum_ins_ctrl   : 2;
			uint32_t replace_crc       : 1;
			uint32_t tx_timestamp_en   : 1;
			uint32_t dis_pad           : 1;
			uint32_t dis_crc           : 1;
			uint32_t first_seg_in_frm  : 1;
			uint32_t last_seg_in_frm   : 1;
			uint32_t intr_on_complete  : 1;
			/* When set, descriptor is owned by DMA. */
			uint32_t own               : 1;
		};
		uint32_t tdes0;
	};
	/* Second word of transmit descriptor */
	union {
		struct {
			uint32_t tx_buf1_sz        : 13;
			uint32_t                   : 3;
			uint32_t tx_buf2_sz        : 13;
			uint32_t src_addr_ins_ctrl : 3;
		};
		uint32_t tdes1;
	};
	/* Pointer to frame data buffer */
	uint8_t *buf1_ptr;
	/* Unused, since this driver initializes only a single descriptor for each
	 * direction.
	 */
	uint8_t *buf2_ptr;
};

/* Transmit descriptor */
struct eth_rx_desc {
	/* First word of receive descriptor */
	union {
		struct {
			uint32_t ext_stat          : 1;
			uint32_t err_crc           : 1;
			uint32_t err_dribble_bit   : 1;
			uint32_t err_rx_mii        : 1;
			uint32_t err_rx_wdt        : 1;
			uint32_t frm_type          : 1;
			uint32_t err_late_coll     : 1;
			uint32_t giant_frm         : 1;
			uint32_t last_desc         : 1;
			uint32_t first_desc        : 1;
			uint32_t vlan_tag          : 1;
			uint32_t err_overflow      : 1;
			uint32_t length_err        : 1;
			uint32_t s_addr_filt_fail  : 1;
			uint32_t err_desc          : 1;
			uint32_t err_summary       : 1;
			uint32_t frm_len           : 14;
			uint32_t d_addr_filt_fail  : 1;
			uint32_t own               : 1;
		};
		uint32_t rdes0;
	};
	/* Second word of receive descriptor */
	union {
		struct {
			uint32_t rx_buf1_sz        : 13;
			uint32_t                   : 1;
			uint32_t addr2_chained     : 1;
			uint32_t rx_end_of_ring    : 1;
			uint32_t rx_buf2_sz        : 13;
			uint32_t                   : 2;
			uint32_t dis_int_compl     : 1;
		};
		uint32_t rdes1;
	};
	/* Pointer to frame data buffer */
	uint8_t *buf1_ptr;
	/* Unused, since this driver initializes only a single descriptor for each
	 * direction.
	 */
	uint8_t *buf2_ptr;
};

/* Driver metadata associated with each Ethernet device */
struct eth_runtime {
	/* Transmit descriptor */
	volatile struct eth_tx_desc tx_desc;
	/* Transmit DMA packet buffer */
	volatile uint8_t tx_buf[UIP_BUFSIZE];
	/* Receive descriptor */
	volatile struct eth_rx_desc rx_desc;
	/* Receive DMA packet buffer */
	volatile uint8_t rx_buf[UIP_BUFSIZE];
};

#define MAC_CONF_14_RMII_100M          BIT(14)
#define MAC_CONF_11_DUPLEX             BIT(11)
#define MAC_CONF_3_TX_EN               BIT(3)
#define MAC_CONF_2_RX_EN               BIT(2)

#define STATUS_RX_INT                  BIT(6)

#define OP_MODE_25_RX_STORE_N_FORWARD  BIT(25)
#define OP_MODE_21_TX_STORE_N_FORWARD  BIT(21)
#define OP_MODE_13_START_TX            BIT(13)
#define OP_MODE_1_START_RX             BIT(1)

#define INT_ENABLE_NORMAL              BIT(16)
#define INT_ENABLE_RX                  BIT(6)

#define REG_ADDR_MAC_CONF              0x0000
#define REG_ADDR_MACADDR_HI            0x0040
#define REG_ADDR_MACADDR_LO            0x0044
#define REG_ADDR_TX_POLL_DEMAND        0x1004
#define REG_ADDR_RX_POLL_DEMAND        0x1008
#define REG_ADDR_RX_DESC_LIST          0x100C
#define REG_ADDR_TX_DESC_LIST          0x1010
#define REG_ADDR_STATUS                0x1014
#define REG_ADDR_DMA_OPERATION         0x1018
#define REG_ADDR_INT_ENABLE            0x101C

#endif /* DRIVERS_ETHERNET_ETH_DW_PRIV_H_ */