drivers/net/wwan/iosm/iosm_ipc_port.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2020-21 Intel Corporation.
   4  */
   5
   6 #include "iosm_ipc_chnl_cfg.h"
   7 #include "iosm_ipc_imem_ops.h"
   8 #include "iosm_ipc_port.h"
   9
  10 /* open logical channel for control communication */
  11 static int ipc_port_ctrl_start(struct wwan_port *port)
  12 {
  13         struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
  14         int ret = 0;
  15
  16         ipc_port->channel = ipc_imem_sys_port_open(ipc_port->ipc_imem,
  17                                                    ipc_port->chl_id,
  18                                                    IPC_HP_CDEV_OPEN);
  19         if (!ipc_port->channel)
  20                 ret = -EIO;
  21
  22         return ret;
  23 }
  24
  25 /* close logical channel */
  26 static void ipc_port_ctrl_stop(struct wwan_port *port)
  27 {
  28         struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
  29
  30         ipc_imem_sys_cdev_close(ipc_port);
  31 }
  32
  33 /* transfer control data to modem */
  34 static int ipc_port_ctrl_tx(struct wwan_port *port, struct sk_buff *skb)
  35 {
  36         struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
  37
  38         return ipc_imem_sys_cdev_write(ipc_port, skb);
  39 }
  40
  41 static const struct wwan_port_ops ipc_wwan_ctrl_ops = {
  42         .start = ipc_port_ctrl_start,
  43         .stop = ipc_port_ctrl_stop,
  44         .tx = ipc_port_ctrl_tx,
  45 };
  46
  47 /* Port init func */
  48 struct iosm_cdev *ipc_port_init(struct iosm_imem *ipc_imem,
  49                                 struct ipc_chnl_cfg ipc_port_cfg)
  50 {
  51         struct iosm_cdev *ipc_port = kzalloc(sizeof(*ipc_port), GFP_KERNEL);
  52         enum wwan_port_type port_type = ipc_port_cfg.wwan_port_type;
  53         enum ipc_channel_id chl_id = ipc_port_cfg.id;
  54
  55         if (!ipc_port)
  56                 return NULL;
  57
  58         ipc_port->dev = ipc_imem->dev;
  59         ipc_port->pcie = ipc_imem->pcie;
  60
  61         ipc_port->port_type = port_type;
  62         ipc_port->chl_id = chl_id;
  63         ipc_port->ipc_imem = ipc_imem;
  64
  65         ipc_port->iosm_port = wwan_create_port(ipc_port->dev, port_type,
  66                                                &ipc_wwan_ctrl_ops, ipc_port);
  67
  68         return ipc_port;
  69 }
  70
  71 /* Port deinit func */
  72 void ipc_port_deinit(struct iosm_cdev *port[])
  73 {
  74         struct iosm_cdev *ipc_port;
  75         u8 ctrl_chl_nr;
  76
  77         for (ctrl_chl_nr = 0; ctrl_chl_nr < IPC_MEM_MAX_CHANNELS;
  78              ctrl_chl_nr++) {
  79                 if (port[ctrl_chl_nr]) {
  80                         ipc_port = port[ctrl_chl_nr];
  81                         wwan_remove_port(ipc_port->iosm_port);
  82                         kfree(ipc_port);
  83                 }
  84         }
  85 }