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
23static LIST_HEAD(mci_list);
24
25static 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
51int 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
61static 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
89int 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
103static void mci_handler(void *priv)
104{
105	struct mci_base *base = (struct mci_base *)priv;
106
107	complete(&base->completion);
108}
109
110static 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
120static int probe(struct mci *state)
121{
122	mci_reset(state);
123	return 0;
124}
125
126struct 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;
175fail:
176	kfree(state);
177	return NULL;
178}
179