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
10 #include "ddbridge.h"
11 #include "ddbridge-io.h"
12 #include "ddbridge-mci.h"
13
14 static LIST_HEAD(mci_list);
15
mci_reset(struct mci * state)16 static int mci_reset(struct mci *state)
17 {
18 struct ddb_link *link = state->base->link;
19 u32 status = 0;
20 u32 timeout = 40;
21
22 ddblwritel(link, MCI_CONTROL_RESET, MCI_CONTROL);
23 ddblwritel(link, 0, MCI_CONTROL + 4); /* 1= no internal init */
24 msleep(300);
25 ddblwritel(link, 0, MCI_CONTROL);
26
27 while (1) {
28 status = ddblreadl(link, MCI_CONTROL);
29 if ((status & MCI_CONTROL_READY) == MCI_CONTROL_READY)
30 break;
31 if (--timeout == 0)
32 break;
33 msleep(50);
34 }
35 if ((status & MCI_CONTROL_READY) == 0)
36 return -1;
37 if (link->ids.device == 0x0009)
38 ddblwritel(link, SX8_TSCONFIG_MODE_NORMAL, SX8_TSCONFIG);
39 return 0;
40 }
41
ddb_mci_config(struct mci * state,u32 config)42 int ddb_mci_config(struct mci *state, u32 config)
43 {
44 struct ddb_link *link = state->base->link;
45
46 if (link->ids.device != 0x0009)
47 return -EINVAL;
48 ddblwritel(link, config, SX8_TSCONFIG);
49 return 0;
50 }
51
_mci_cmd_unlocked(struct mci * state,u32 * cmd,u32 cmd_len,u32 * res,u32 res_len)52 static int _mci_cmd_unlocked(struct mci *state,
53 u32 *cmd, u32 cmd_len,
54 u32 *res, u32 res_len)
55 {
56 struct ddb_link *link = state->base->link;
57 u32 i, val;
58 unsigned long stat;
59
60 val = ddblreadl(link, MCI_CONTROL);
61 if (val & (MCI_CONTROL_RESET | MCI_CONTROL_START_COMMAND))
62 return -EIO;
63 if (cmd && cmd_len)
64 for (i = 0; i < cmd_len; i++)
65 ddblwritel(link, cmd[i], MCI_COMMAND + i * 4);
66 val |= (MCI_CONTROL_START_COMMAND | MCI_CONTROL_ENABLE_DONE_INTERRUPT);
67 ddblwritel(link, val, MCI_CONTROL);
68
69 stat = wait_for_completion_timeout(&state->base->completion, HZ);
70 if (stat == 0) {
71 dev_warn(state->base->dev, "MCI-%d: MCI timeout\n", state->nr);
72 return -EIO;
73 }
74 if (res && res_len)
75 for (i = 0; i < res_len; i++)
76 res[i] = ddblreadl(link, MCI_RESULT + i * 4);
77 return 0;
78 }
79
ddb_mci_cmd(struct mci * state,struct mci_command * command,struct mci_result * result)80 int ddb_mci_cmd(struct mci *state,
81 struct mci_command *command,
82 struct mci_result *result)
83 {
84 int stat;
85
86 mutex_lock(&state->base->mci_lock);
87 stat = _mci_cmd_unlocked(state,
88 (u32 *)command, sizeof(*command) / sizeof(u32),
89 (u32 *)result, sizeof(*result) / sizeof(u32));
90 mutex_unlock(&state->base->mci_lock);
91 return stat;
92 }
93
mci_handler(void * priv)94 static void mci_handler(void *priv)
95 {
96 struct mci_base *base = (struct mci_base *)priv;
97
98 complete(&base->completion);
99 }
100
match_base(void * key)101 static struct mci_base *match_base(void *key)
102 {
103 struct mci_base *p;
104
105 list_for_each_entry(p, &mci_list, mci_list)
106 if (p->key == key)
107 return p;
108 return NULL;
109 }
110
probe(struct mci * state)111 static int probe(struct mci *state)
112 {
113 mci_reset(state);
114 return 0;
115 }
116
117 struct dvb_frontend
ddb_mci_attach(struct ddb_input * input,struct mci_cfg * cfg,int nr,int (** fn_set_input)(struct dvb_frontend * fe,int input))118 *ddb_mci_attach(struct ddb_input *input, struct mci_cfg *cfg, int nr,
119 int (**fn_set_input)(struct dvb_frontend *fe, int input))
120 {
121 struct ddb_port *port = input->port;
122 struct ddb *dev = port->dev;
123 struct ddb_link *link = &dev->link[port->lnr];
124 struct mci_base *base;
125 struct mci *state;
126 void *key = cfg->type ? (void *)port : (void *)link;
127
128 state = kzalloc(cfg->state_size, GFP_KERNEL);
129 if (!state)
130 return NULL;
131
132 base = match_base(key);
133 if (base) {
134 base->count++;
135 state->base = base;
136 } else {
137 base = kzalloc(cfg->base_size, GFP_KERNEL);
138 if (!base)
139 goto fail;
140 base->key = key;
141 base->count = 1;
142 base->link = link;
143 base->dev = dev->dev;
144 mutex_init(&base->mci_lock);
145 mutex_init(&base->tuner_lock);
146 ddb_irq_set(dev, link->nr, 0, mci_handler, base);
147 init_completion(&base->completion);
148 state->base = base;
149 if (probe(state) < 0) {
150 kfree(base);
151 goto fail;
152 }
153 list_add(&base->mci_list, &mci_list);
154 if (cfg->base_init)
155 cfg->base_init(base);
156 }
157 memcpy(&state->fe.ops, cfg->fe_ops, sizeof(struct dvb_frontend_ops));
158 state->fe.demodulator_priv = state;
159 state->nr = nr;
160 *fn_set_input = cfg->set_input;
161 state->tuner = nr;
162 state->demod = nr;
163 if (cfg->init)
164 cfg->init(state);
165 return &state->fe;
166 fail:
167 kfree(state);
168 return NULL;
169 }
170