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 <linux/pm_runtime.h>
   7
   8 #include "iosm_ipc_chnl_cfg.h"
   9 #include "iosm_ipc_imem_ops.h"
  10 #include "iosm_ipc_port.h"
  11
  12 /* open logical channel for control communication */
  13 static int ipc_port_ctrl_start(struct wwan_port *port)
  14 {
  15         struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
  16         int ret = 0;
  17
  18         pm_runtime_get_sync(ipc_port->ipc_imem->dev);
  19         ipc_port->channel = ipc_imem_sys_port_open(ipc_port->ipc_imem,
  20                                                    ipc_port->chl_id,
  21                                                    IPC_HP_CDEV_OPEN);
  22         if (!ipc_port->channel)
  23                 ret = -EIO;
  24
  25         pm_runtime_mark_last_busy(ipc_port->ipc_imem->dev);
  26         pm_runtime_put_autosuspend(ipc_port->ipc_imem->dev);
  27
  28         return ret;
  29 }
  30
  31 /* close logical channel */
  32 static void ipc_port_ctrl_stop(struct wwan_port *port)
  33 {
  34         struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
  35
  36         pm_runtime_get_sync(ipc_port->ipc_imem->dev);
  37         ipc_imem_sys_port_close(ipc_port->ipc_imem, ipc_port->channel);
  38         pm_runtime_mark_last_busy(ipc_port->ipc_imem->dev);
  39         pm_runtime_put_autosuspend(ipc_port->ipc_imem->dev);
  40 }
  41
  42 /* transfer control data to modem */
  43 static int ipc_port_ctrl_tx(struct wwan_port *port, struct sk_buff *skb)
  44 {
  45         struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
  46         int ret;
  47
  48         pm_runtime_get_sync(ipc_port->ipc_imem->dev);
  49         ret = ipc_imem_sys_cdev_write(ipc_port, skb);
  50         pm_runtime_mark_last_busy(ipc_port->ipc_imem->dev);
  51         pm_runtime_put_autosuspend(ipc_port->ipc_imem->dev);
  52
  53         return ret;
  54 }
  55
  56 static const struct wwan_port_ops ipc_wwan_ctrl_ops = {
  57         .start = ipc_port_ctrl_start,
  58         .stop = ipc_port_ctrl_stop,
  59         .tx = ipc_port_ctrl_tx,
  60 };
  61
  62 /* Port init func */
  63 struct iosm_cdev *ipc_port_init(struct iosm_imem *ipc_imem,
  64                                 struct ipc_chnl_cfg ipc_port_cfg)
  65 {
  66         struct iosm_cdev *ipc_port = kzalloc(sizeof(*ipc_port), GFP_KERNEL);
  67         enum wwan_port_type port_type = ipc_port_cfg.wwan_port_type;
  68         enum ipc_channel_id chl_id = ipc_port_cfg.id;
  69
  70         if (!ipc_port)
  71                 return NULL;
  72
  73         ipc_port->dev = ipc_imem->dev;
  74         ipc_port->pcie = ipc_imem->pcie;
  75
  76         ipc_port->port_type = port_type;
  77         ipc_port->chl_id = chl_id;
  78         ipc_port->ipc_imem = ipc_imem;
  79
  80         ipc_port->iosm_port = wwan_create_port(ipc_port->dev, port_type,
  81                                                &ipc_wwan_ctrl_ops, NULL,
  82                                                ipc_port);
  83
  84         return ipc_port;
  85 }
  86
  87 /* Port deinit func */
  88 void ipc_port_deinit(struct iosm_cdev *port[])
  89 {
  90         struct iosm_cdev *ipc_port;
  91         u8 ctrl_chl_nr;
  92
  93         for (ctrl_chl_nr = 0; ctrl_chl_nr < IPC_MEM_MAX_CHANNELS;
  94              ctrl_chl_nr++) {
  95                 if (port[ctrl_chl_nr]) {
  96                         ipc_port = port[ctrl_chl_nr];
  97                         wwan_remove_port(ipc_port->iosm_port);
  98                         kfree(ipc_port);
  99                 }
 100         }
 101 }