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41e840b1 MA |
1 | /* |
2 | Mantis PCI bridge driver | |
3 | ||
4 | Copyright (C) 2005, 2006 Manu Abraham (abraham.manu@gmail.com) | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/delay.h> | |
25 | #include <asm/io.h> | |
26 | #include <linux/ioport.h> | |
27 | #include <asm/pgtable.h> | |
28 | #include <asm/page.h> | |
29 | #include "mantis_common.h" | |
30 | ||
31 | #define I2C_HW_B_MANTIS 0x1c | |
32 | ||
33 | static int mantis_ack_wait(struct mantis_pci *mantis) | |
34 | { | |
35 | int rc = 0; | |
36 | ||
37 | if (wait_event_interruptible_timeout(mantis->i2c_wq, | |
38 | mantis->mantis_int_stat & MANTIS_INT_I2CRACK, | |
39 | msecs_to_jiffies(50)) == -ERESTARTSYS) | |
40 | ||
41 | rc = -EREMOTEIO; | |
42 | /* | |
43 | // Wait till we are done | |
44 | while (mantis->mantis_int_stat & MANTIS_INT_I2CRACK){ | |
45 | if (mantis->mantis_int_stat & MANTIS_INT_I2CDONE) { | |
46 | mantis->mantis_int_stat &= ~MANTIS_INT_I2CRACK; | |
47 | // dprintk(verbose, MANTIS_DEBUG, 1, "SLAVE RACK 'ed .. Waiting for I2CDONE"); | |
48 | break; | |
49 | } | |
50 | } | |
51 | ||
52 | if (mantis->mantis_int_stat & MANTIS_INT_I2CDONE) { | |
53 | // dprintk(verbose, MANTIS_DEBUG, 1, "Mantis Int I2CDONE"); | |
54 | rc = 1; | |
55 | } | |
56 | ||
57 | mantis->mantis_int_stat &= ~MANTIS_INT_I2CDONE; | |
58 | */ | |
59 | // .. | |
60 | if (mantis->mantis_int_stat & MANTIS_INT_I2CRACK) | |
61 | msleep_interruptible(10); | |
62 | ||
63 | return rc; | |
64 | } | |
65 | ||
66 | static int mantis_i2c_read(struct mantis_pci *mantis, const struct i2c_msg *msg) | |
67 | { | |
68 | u32 rxd, i; | |
69 | ||
70 | dprintk(verbose, MANTIS_DEBUG, 1, "Address=[0x%02x]", msg->addr); | |
71 | for (i = 0; i < msg->len; i++) { | |
72 | rxd = (msg->addr << 25) | (1 << 24) | |
73 | | MANTIS_I2C_RATE_3 | |
74 | | MANTIS_I2C_STOP | |
75 | | MANTIS_I2C_PGMODE; | |
76 | ||
77 | if (i == (msg->len - 1)) | |
78 | rxd &= ~MANTIS_I2C_STOP; | |
79 | ||
80 | mmwrite(rxd, MANTIS_I2CDATA_CTL); | |
81 | if (mantis_ack_wait(mantis) < 0) { | |
82 | dprintk(verbose, MANTIS_DEBUG, 1, "ACK failed<R>"); | |
83 | return -EIO; | |
84 | } | |
85 | rxd = mmread(MANTIS_I2CDATA_CTL); | |
86 | msg->buf[i] = (u8)((rxd >> 8) & 0xFF); | |
87 | dprintk(verbose, MANTIS_DEBUG, 1, | |
88 | "Data<R[%d]>=[0x%02x]", i, msg->buf[i]); | |
89 | ||
90 | msleep_interruptible(2); | |
91 | } | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | static int mantis_i2c_write(struct mantis_pci *mantis, const struct i2c_msg *msg) | |
97 | { | |
98 | int i; | |
99 | u32 txd = 0; | |
100 | ||
101 | dprintk(verbose, MANTIS_DEBUG, 1, "Address=[0x%02x]", msg->addr); | |
102 | for (i = 0; i < msg->len; i++) { | |
103 | dprintk(verbose, MANTIS_DEBUG, 1, "Data<W[%d]>=[0x%02x]", i, msg->buf[i]); | |
104 | txd = (msg->addr << 25) | (msg->buf[i] << 8) | |
105 | | MANTIS_I2C_RATE_3 | |
106 | | MANTIS_I2C_STOP | |
107 | | MANTIS_I2C_PGMODE; | |
108 | ||
109 | if (i == (msg->len - 1)) | |
110 | txd &= ~MANTIS_I2C_STOP; | |
111 | ||
112 | mmwrite(txd, MANTIS_I2CDATA_CTL); | |
113 | if (mantis_ack_wait(mantis) < 0) { | |
114 | dprintk(verbose, MANTIS_DEBUG, 1, "ACK failed<W>"); | |
115 | return -1; | |
116 | } | |
117 | udelay(500); | |
118 | } | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static int mantis_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) | |
124 | { | |
125 | int ret = 0, i; | |
126 | struct mantis_pci *mantis; | |
127 | ||
128 | mantis = i2c_get_adapdata(adapter); | |
129 | for (i = 0; i < num; i++) { | |
130 | if (msgs[i].flags & I2C_M_RD) | |
131 | ret = mantis_i2c_read(mantis, &msgs[i]); | |
132 | else | |
133 | ret = mantis_i2c_write(mantis, &msgs[i]); | |
134 | ||
135 | if (ret < 0) | |
136 | return ret; | |
137 | } | |
138 | ||
139 | return num; | |
140 | } | |
141 | ||
142 | static u32 mantis_i2c_func(struct i2c_adapter *adapter) | |
143 | { | |
144 | return I2C_FUNC_SMBUS_EMUL; | |
145 | } | |
146 | ||
147 | static struct i2c_algorithm mantis_algo = { | |
148 | .master_xfer = mantis_i2c_xfer, | |
149 | .functionality = mantis_i2c_func, | |
150 | }; | |
151 | ||
152 | static struct i2c_adapter mantis_i2c_adapter = { | |
153 | .owner = THIS_MODULE, | |
154 | .name = "Mantis I2C", | |
155 | .id = I2C_HW_B_MANTIS, | |
156 | .class = I2C_CLASS_TV_DIGITAL, | |
157 | .algo = &mantis_algo, | |
158 | }; | |
159 | ||
160 | int __devinit mantis_i2c_init(struct mantis_pci *mantis) | |
161 | { | |
162 | u32 intstat; | |
163 | ||
164 | memcpy(&mantis->adapter, &mantis_i2c_adapter, sizeof (mantis_i2c_adapter)); | |
165 | i2c_set_adapdata(&mantis->adapter, mantis); | |
166 | mantis->i2c_rc = i2c_add_adapter(&mantis->adapter); | |
167 | if (mantis->i2c_rc < 0) | |
168 | return mantis->i2c_rc; | |
169 | ||
170 | dprintk(verbose, MANTIS_DEBUG, 1, "Initializing I2C .."); | |
171 | ||
172 | // Clear all interrupts | |
173 | intstat = mmread(MANTIS_INT_STAT); | |
174 | mmwrite(intstat, MANTIS_INT_STAT); | |
175 | ||
176 | mmwrite(mmread(MANTIS_INT_MASK) | MANTIS_INT_I2CDONE, | |
177 | MANTIS_INT_MASK); | |
178 | ||
179 | dprintk(verbose, MANTIS_DEBUG, 1, "[0x%08x/%08x]", | |
180 | mmread(MANTIS_INT_STAT), mmread(MANTIS_INT_MASK)); | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | int __devexit mantis_i2c_exit(struct mantis_pci *mantis) | |
186 | { | |
187 | dprintk(verbose, MANTIS_DEBUG, 1, "Removing I2C adapter"); | |
188 | return i2c_del_adapter(&mantis->adapter); | |
189 | } |