drivers/media/pci/ddbridge/ddbridge-mci.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ddbridge-mci.c: Digital Devices microcode interface
   4  *
   5  * Copyright (C) 2017-2018 Digital Devices GmbH
   6  *                         Ralph Metzler <rjkm@metzlerbros.de>
   7  *                         Marcus Metzler <mocm@metzlerbros.de>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 only, as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include "ddbridge.h"
  20 #include "ddbridge-io.h"
  21 #include "ddbridge-mci.h"
  22
  23 static LIST_HEAD(mci_list);
  24
  25 static int mci_reset(struct mci *state)
  26 {
  27         struct ddb_link *link = state->base->link;
  28         u32 status = 0;
  29         u32 timeout = 40;
  30
  31         ddblwritel(link, MCI_CONTROL_RESET, MCI_CONTROL);
  32         ddblwritel(link, 0, MCI_CONTROL + 4); /* 1= no internal init */
  33         msleep(300);
  34         ddblwritel(link, 0, MCI_CONTROL);
  35
  36         while (1) {
  37                 status = ddblreadl(link, MCI_CONTROL);
  38                 if ((status & MCI_CONTROL_READY) == MCI_CONTROL_READY)
  39                         break;
  40                 if (--timeout == 0)
  41                         break;
  42                 msleep(50);
  43         }
  44         if ((status & MCI_CONTROL_READY) == 0)
  45                 return -1;
  46         if (link->ids.device == 0x0009)
  47                 ddblwritel(link, SX8_TSCONFIG_MODE_NORMAL, SX8_TSCONFIG);
  48         return 0;
  49 }
  50
  51 int ddb_mci_config(struct mci *state, u32 config)
  52 {
  53         struct ddb_link *link = state->base->link;
  54
  55         if (link->ids.device != 0x0009)
  56                 return -EINVAL;
  57         ddblwritel(link, config, SX8_TSCONFIG);
  58         return 0;
  59 }
  60
  61 static int _mci_cmd_unlocked(struct mci *state,
  62                              u32 *cmd, u32 cmd_len,
  63                              u32 *res, u32 res_len)
  64 {
  65         struct ddb_link *link = state->base->link;
  66         u32 i, val;
  67         unsigned long stat;
  68
  69         val = ddblreadl(link, MCI_CONTROL);
  70         if (val & (MCI_CONTROL_RESET | MCI_CONTROL_START_COMMAND))
  71                 return -EIO;
  72         if (cmd && cmd_len)
  73                 for (i = 0; i < cmd_len; i++)
  74                         ddblwritel(link, cmd[i], MCI_COMMAND + i * 4);
  75         val |= (MCI_CONTROL_START_COMMAND | MCI_CONTROL_ENABLE_DONE_INTERRUPT);
  76         ddblwritel(link, val, MCI_CONTROL);
  77
  78         stat = wait_for_completion_timeout(&state->base->completion, HZ);
  79         if (stat == 0) {
  80                 dev_warn(state->base->dev, "MCI-%d: MCI timeout\n", state->nr);
  81                 return -EIO;
  82         }
  83         if (res && res_len)
  84                 for (i = 0; i < res_len; i++)
  85                         res[i] = ddblreadl(link, MCI_RESULT + i * 4);
  86         return 0;
  87 }
  88
  89 int ddb_mci_cmd(struct mci *state,
  90                 struct mci_command *command,
  91                 struct mci_result *result)
  92 {
  93         int stat;
  94
  95         mutex_lock(&state->base->mci_lock);
  96         stat = _mci_cmd_unlocked(state,
  97                                  (u32 *)command, sizeof(*command) / sizeof(u32),
  98                                  (u32 *)result, sizeof(*result) / sizeof(u32));
  99         mutex_unlock(&state->base->mci_lock);
 100         return stat;
 101 }
 102
 103 static void mci_handler(void *priv)
 104 {
 105         struct mci_base *base = (struct mci_base *)priv;
 106
 107         complete(&base->completion);
 108 }
 109
 110 static struct mci_base *match_base(void *key)
 111 {
 112         struct mci_base *p;
 113
 114         list_for_each_entry(p, &mci_list, mci_list)
 115                 if (p->key == key)
 116                         return p;
 117         return NULL;
 118 }
 119
 120 static int probe(struct mci *state)
 121 {
 122         mci_reset(state);
 123         return 0;
 124 }
 125
 126 struct dvb_frontend
 127 *ddb_mci_attach(struct ddb_input *input, struct mci_cfg *cfg, int nr,
 128                 int (**fn_set_input)(struct dvb_frontend *fe, int input))
 129 {
 130         struct ddb_port *port = input->port;
 131         struct ddb *dev = port->dev;
 132         struct ddb_link *link = &dev->link[port->lnr];
 133         struct mci_base *base;
 134         struct mci *state;
 135         void *key = cfg->type ? (void *)port : (void *)link;
 136
 137         state = kzalloc(cfg->state_size, GFP_KERNEL);
 138         if (!state)
 139                 return NULL;
 140
 141         base = match_base(key);
 142         if (base) {
 143                 base->count++;
 144                 state->base = base;
 145         } else {
 146                 base = kzalloc(cfg->base_size, GFP_KERNEL);
 147                 if (!base)
 148                         goto fail;
 149                 base->key = key;
 150                 base->count = 1;
 151                 base->link = link;
 152                 base->dev = dev->dev;
 153                 mutex_init(&base->mci_lock);
 154                 mutex_init(&base->tuner_lock);
 155                 ddb_irq_set(dev, link->nr, 0, mci_handler, base);
 156                 init_completion(&base->completion);
 157                 state->base = base;
 158                 if (probe(state) < 0) {
 159                         kfree(base);
 160                         goto fail;
 161                 }
 162                 list_add(&base->mci_list, &mci_list);
 163                 if (cfg->base_init)
 164                         cfg->base_init(base);
 165         }
 166         memcpy(&state->fe.ops, cfg->fe_ops, sizeof(struct dvb_frontend_ops));
 167         state->fe.demodulator_priv = state;
 168         state->nr = nr;
 169         *fn_set_input = cfg->set_input;
 170         state->tuner = nr;
 171         state->demod = nr;
 172         if (cfg->init)
 173                 cfg->init(state);
 174         return &state->fe;
 175 fail:
 176         kfree(state);
 177         return NULL;
 178 }