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 
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 
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 
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 
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 
94 static void mci_handler(void *priv)
95 {
96 	struct mci_base *base = (struct mci_base *)priv;
97 
98 	complete(&base->completion);
99 }
100 
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 
111 static int probe(struct mci *state)
112 {
113 	mci_reset(state);
114 	return 0;
115 }
116 
117 struct dvb_frontend
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