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net: iosm: wwan port control device

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Implements wwan port for MBIM & AT protocol communication

Signed-off-by: M Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
M Chetan Kumar 2021-06-13 18:20:14 +05:30 committed by David S. Miller
parent 30ebda7a31
commit 10685b6e98
2 changed files with 135 additions and 0 deletions
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85
drivers/net/wwan/iosm/iosm_ipc_port.c Normal file
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020-21 Intel Corporation.
*/
#include "iosm_ipc_chnl_cfg.h"
#include "iosm_ipc_imem_ops.h"
#include "iosm_ipc_port.h"
/* open logical channel for control communication */
static int ipc_port_ctrl_start(struct wwan_port *port)
{
struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
int ret = 0;
ipc_port->channel = ipc_imem_sys_port_open(ipc_port->ipc_imem,
ipc_port->chl_id,
IPC_HP_CDEV_OPEN);
if (!ipc_port->channel)
ret = -EIO;
return ret;
}
/* close logical channel */
static void ipc_port_ctrl_stop(struct wwan_port *port)
{
struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
ipc_imem_sys_cdev_close(ipc_port);
}
/* transfer control data to modem */
static int ipc_port_ctrl_tx(struct wwan_port *port, struct sk_buff *skb)
{
struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
return ipc_imem_sys_cdev_write(ipc_port, skb);
}
static const struct wwan_port_ops ipc_wwan_ctrl_ops = {
.start = ipc_port_ctrl_start,
.stop = ipc_port_ctrl_stop,
.tx = ipc_port_ctrl_tx,
};
/* Port init func */
struct iosm_cdev *ipc_port_init(struct iosm_imem *ipc_imem,
struct ipc_chnl_cfg ipc_port_cfg)
{
struct iosm_cdev *ipc_port = kzalloc(sizeof(*ipc_port), GFP_KERNEL);
enum wwan_port_type port_type = ipc_port_cfg.wwan_port_type;
enum ipc_channel_id chl_id = ipc_port_cfg.id;
if (!ipc_port)
return NULL;
ipc_port->dev = ipc_imem->dev;
ipc_port->pcie = ipc_imem->pcie;
ipc_port->port_type = port_type;
ipc_port->chl_id = chl_id;
ipc_port->ipc_imem = ipc_imem;
ipc_port->iosm_port = wwan_create_port(ipc_port->dev, port_type,
&ipc_wwan_ctrl_ops, ipc_port);
return ipc_port;
}
/* Port deinit func */
void ipc_port_deinit(struct iosm_cdev *port[])
{
struct iosm_cdev *ipc_port;
u8 ctrl_chl_nr;
for (ctrl_chl_nr = 0; ctrl_chl_nr < IPC_MEM_MAX_CHANNELS;
ctrl_chl_nr++) {
if (port[ctrl_chl_nr]) {
ipc_port = port[ctrl_chl_nr];
wwan_remove_port(ipc_port->iosm_port);
kfree(ipc_port);
}
}
}

50
drivers/net/wwan/iosm/iosm_ipc_port.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-only
*
* Copyright (C) 2020-21 Intel Corporation.
*/
#ifndef IOSM_IPC_PORT_H
#define IOSM_IPC_PORT_H
#include <linux/wwan.h>
#include "iosm_ipc_imem_ops.h"
/**
* struct iosm_cdev - State of the char driver layer.
* @iosm_port: Pointer of type wwan_port
* @ipc_imem: imem instance
* @dev: Pointer to device struct
* @pcie: PCIe component
* @port_type: WWAN port type
* @channel: Channel instance
* @chl_id: Channel Indentifier
*/
struct iosm_cdev {
struct wwan_port *iosm_port;
struct iosm_imem *ipc_imem;
struct device *dev;
struct iosm_pcie *pcie;
enum wwan_port_type port_type;
struct ipc_mem_channel *channel;
enum ipc_channel_id chl_id;
};
/**
* ipc_port_init - Allocate IPC port & register to wwan subsystem for AT/MBIM
* communication.
* @ipc_imem: Pointer to iosm_imem structure
* @ipc_port_cfg: IPC Port Config
*
* Returns: 0 on success & NULL on failure
*/
struct iosm_cdev *ipc_port_init(struct iosm_imem *ipc_imem,
struct ipc_chnl_cfg ipc_port_cfg);
/**
* ipc_port_deinit - Free IPC port & unregister port with wwan subsystem.
* @ipc_port: Array of pointer to the ipc port data-struct
*/
void ipc_port_deinit(struct iosm_cdev *ipc_port[]);
#endif