xref: /kernel/linux/linux-6.6/drivers/net/wwan/t7xx/t7xx_port.h

/* SPDX-License-Identifier: GPL-2.0-only
 *
 * Copyright (c) 2021, MediaTek Inc.
 * Copyright (c) 2021-2022, Intel Corporation.
 *
 * Authors:
 *  Haijun Liu <haijun.liu@mediatek.com>
 *  Moises Veleta <moises.veleta@intel.com>
 *  Ricardo Martinez <ricardo.martinez@linux.intel.com>
 *
 * Contributors:
 *  Amir Hanania <amir.hanania@intel.com>
 *  Andy Shevchenko <andriy.shevchenko@linux.intel.com>
 *  Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
 *  Eliot Lee <eliot.lee@intel.com>
 */

#ifndef __T7XX_PORT_H__
#define __T7XX_PORT_H__

#include <linux/bits.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <linux/wwan.h>

#include "t7xx_hif_cldma.h"
#include "t7xx_pci.h"

#define PORT_CH_ID_MASK		GENMASK(7, 0)

/* Channel ID and Message ID definitions.
 * The channel number consists of peer_id(15:12) , channel_id(11:0)
 * peer_id:
 * 0:reserved, 1: to AP, 2: to MD
 */
enum port_ch {
	/* to AP */
	PORT_CH_AP_CONTROL_RX = 0x1000,
	PORT_CH_AP_CONTROL_TX = 0x1001,

	/* to MD */
	PORT_CH_CONTROL_RX = 0x2000,
	PORT_CH_CONTROL_TX = 0x2001,
	PORT_CH_UART1_RX = 0x2006,	/* META */
	PORT_CH_UART1_TX = 0x2008,
	PORT_CH_UART2_RX = 0x200a,	/* AT */
	PORT_CH_UART2_TX = 0x200c,
	PORT_CH_MD_LOG_RX = 0x202a,	/* MD logging */
	PORT_CH_MD_LOG_TX = 0x202b,
	PORT_CH_LB_IT_RX = 0x203e,	/* Loop back test */
	PORT_CH_LB_IT_TX = 0x203f,
	PORT_CH_STATUS_RX = 0x2043,	/* Status events */
	PORT_CH_MIPC_RX = 0x20ce,	/* MIPC */
	PORT_CH_MIPC_TX = 0x20cf,
	PORT_CH_MBIM_RX = 0x20d0,
	PORT_CH_MBIM_TX = 0x20d1,
	PORT_CH_DSS0_RX = 0x20d2,
	PORT_CH_DSS0_TX = 0x20d3,
	PORT_CH_DSS1_RX = 0x20d4,
	PORT_CH_DSS1_TX = 0x20d5,
	PORT_CH_DSS2_RX = 0x20d6,
	PORT_CH_DSS2_TX = 0x20d7,
	PORT_CH_DSS3_RX = 0x20d8,
	PORT_CH_DSS3_TX = 0x20d9,
	PORT_CH_DSS4_RX = 0x20da,
	PORT_CH_DSS4_TX = 0x20db,
	PORT_CH_DSS5_RX = 0x20dc,
	PORT_CH_DSS5_TX = 0x20dd,
	PORT_CH_DSS6_RX = 0x20de,
	PORT_CH_DSS6_TX = 0x20df,
	PORT_CH_DSS7_RX = 0x20e0,
	PORT_CH_DSS7_TX = 0x20e1,
};

struct t7xx_port;
struct port_ops {
	int (*init)(struct t7xx_port *port);
	int (*recv_skb)(struct t7xx_port *port, struct sk_buff *skb);
	void (*md_state_notify)(struct t7xx_port *port, unsigned int md_state);
	void (*uninit)(struct t7xx_port *port);
	int (*enable_chl)(struct t7xx_port *port);
	int (*disable_chl)(struct t7xx_port *port);
};

struct t7xx_port_conf {
	enum port_ch		tx_ch;
	enum port_ch		rx_ch;
	unsigned char		txq_index;
	unsigned char		rxq_index;
	unsigned char		txq_exp_index;
	unsigned char		rxq_exp_index;
	enum cldma_id		path_id;
	struct port_ops		*ops;
	char			*name;
	enum wwan_port_type	port_type;
};

struct t7xx_port {
	/* Members not initialized in definition */
	const struct t7xx_port_conf	*port_conf;
	struct t7xx_pci_dev		*t7xx_dev;
	struct device			*dev;
	u16				seq_nums[2];	/* TX/RX sequence numbers */
	atomic_t			usage_cnt;
	struct				list_head entry;
	struct				list_head queue_entry;
	/* TX and RX flows are asymmetric since ports are multiplexed on
	 * queues.
	 *
	 * TX: data blocks are sent directly to a queue. Each port
	 * does not maintain a TX list; instead, they only provide
	 * a wait_queue_head for blocking writes.
	 *
	 * RX: Each port uses a RX list to hold packets,
	 * allowing the modem to dispatch RX packet as quickly as possible.
	 */
	struct sk_buff_head		rx_skb_list;
	spinlock_t			port_update_lock; /* Protects port configuration */
	wait_queue_head_t		rx_wq;
	int				rx_length_th;
	bool				chan_enable;
	struct task_struct		*thread;
	union {
		struct {
			struct wwan_port		*wwan_port;
		} wwan;
		struct {
			struct rchan			*relaych;
		} log;
	};
};

struct sk_buff *t7xx_port_alloc_skb(int payload);
struct sk_buff *t7xx_ctrl_alloc_skb(int payload);
int t7xx_port_enqueue_skb(struct t7xx_port *port, struct sk_buff *skb);
int t7xx_port_send_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int pkt_header,
		       unsigned int ex_msg);
int t7xx_port_send_ctl_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int msg,
			   unsigned int ex_msg);

#endif /* __T7XX_PORT_H__ */