1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Earthsoft PT3 driver |
4 | * |
5 | * Copyright (C) 2014 Akihiro Tsukada <tskd08@gmail.com> |
6 | */ |
7 | #include <linux/delay.h> |
8 | #include <linux/device.h> |
9 | #include <linux/i2c.h> |
10 | #include <linux/io.h> |
11 | #include <linux/pci.h> |
12 | |
13 | #include "pt3.h" |
14 | |
15 | #define PT3_I2C_BASE 2048 |
16 | #define PT3_CMD_ADDR_NORMAL 0 |
17 | #define PT3_CMD_ADDR_INIT_DEMOD 4096 |
18 | #define PT3_CMD_ADDR_INIT_TUNER (4096 + 2042) |
19 | |
20 | /* masks for I2C status register */ |
21 | #define STAT_SEQ_RUNNING 0x1 |
22 | #define STAT_SEQ_ERROR 0x6 |
23 | #define STAT_NO_SEQ 0x8 |
24 | |
25 | #define PT3_I2C_RUN (1 << 16) |
26 | #define PT3_I2C_RESET (1 << 17) |
27 | |
28 | enum ctl_cmd { |
29 | I_END, |
30 | I_ADDRESS, |
31 | I_CLOCK_L, |
32 | I_CLOCK_H, |
33 | I_DATA_L, |
34 | I_DATA_H, |
35 | I_RESET, |
36 | I_SLEEP, |
37 | I_DATA_L_NOP = 0x08, |
38 | I_DATA_H_NOP = 0x0c, |
39 | I_DATA_H_READ = 0x0d, |
40 | I_DATA_H_ACK0 = 0x0e, |
41 | I_DATA_H_ACK1 = 0x0f, |
42 | }; |
43 | |
44 | |
45 | static void cmdbuf_add(struct pt3_i2cbuf *cbuf, enum ctl_cmd cmd) |
46 | { |
47 | int buf_idx; |
48 | |
49 | if ((cbuf->num_cmds % 2) == 0) |
50 | cbuf->tmp = cmd; |
51 | else { |
52 | cbuf->tmp |= cmd << 4; |
53 | buf_idx = cbuf->num_cmds / 2; |
54 | if (buf_idx < ARRAY_SIZE(cbuf->data)) |
55 | cbuf->data[buf_idx] = cbuf->tmp; |
56 | } |
57 | cbuf->num_cmds++; |
58 | } |
59 | |
60 | static void put_end(struct pt3_i2cbuf *cbuf) |
61 | { |
62 | cmdbuf_add(cbuf, cmd: I_END); |
63 | if (cbuf->num_cmds % 2) |
64 | cmdbuf_add(cbuf, cmd: I_END); |
65 | } |
66 | |
67 | static void put_start(struct pt3_i2cbuf *cbuf) |
68 | { |
69 | cmdbuf_add(cbuf, cmd: I_DATA_H); |
70 | cmdbuf_add(cbuf, cmd: I_CLOCK_H); |
71 | cmdbuf_add(cbuf, cmd: I_DATA_L); |
72 | cmdbuf_add(cbuf, cmd: I_CLOCK_L); |
73 | } |
74 | |
75 | static void put_byte_write(struct pt3_i2cbuf *cbuf, u8 val) |
76 | { |
77 | u8 mask; |
78 | |
79 | for (mask = 0x80; mask > 0; mask >>= 1) |
80 | cmdbuf_add(cbuf, cmd: (val & mask) ? I_DATA_H_NOP : I_DATA_L_NOP); |
81 | cmdbuf_add(cbuf, cmd: I_DATA_H_ACK0); |
82 | } |
83 | |
84 | static void put_byte_read(struct pt3_i2cbuf *cbuf, u32 size) |
85 | { |
86 | int i, j; |
87 | |
88 | for (i = 0; i < size; i++) { |
89 | for (j = 0; j < 8; j++) |
90 | cmdbuf_add(cbuf, cmd: I_DATA_H_READ); |
91 | cmdbuf_add(cbuf, cmd: (i == size - 1) ? I_DATA_H_NOP : I_DATA_L_NOP); |
92 | } |
93 | } |
94 | |
95 | static void put_stop(struct pt3_i2cbuf *cbuf) |
96 | { |
97 | cmdbuf_add(cbuf, cmd: I_DATA_L); |
98 | cmdbuf_add(cbuf, cmd: I_CLOCK_H); |
99 | cmdbuf_add(cbuf, cmd: I_DATA_H); |
100 | } |
101 | |
102 | |
103 | /* translates msgs to internal commands for bit-banging */ |
104 | static void translate(struct pt3_i2cbuf *cbuf, struct i2c_msg *msgs, int num) |
105 | { |
106 | int i, j; |
107 | bool rd; |
108 | |
109 | cbuf->num_cmds = 0; |
110 | for (i = 0; i < num; i++) { |
111 | rd = !!(msgs[i].flags & I2C_M_RD); |
112 | put_start(cbuf); |
113 | put_byte_write(cbuf, val: msgs[i].addr << 1 | rd); |
114 | if (rd) |
115 | put_byte_read(cbuf, size: msgs[i].len); |
116 | else |
117 | for (j = 0; j < msgs[i].len; j++) |
118 | put_byte_write(cbuf, val: msgs[i].buf[j]); |
119 | } |
120 | if (num > 0) { |
121 | put_stop(cbuf); |
122 | put_end(cbuf); |
123 | } |
124 | } |
125 | |
126 | static int wait_i2c_result(struct pt3_board *pt3, u32 *result, int max_wait) |
127 | { |
128 | int i; |
129 | u32 v; |
130 | |
131 | for (i = 0; i < max_wait; i++) { |
132 | v = ioread32(pt3->regs[0] + REG_I2C_R); |
133 | if (!(v & STAT_SEQ_RUNNING)) |
134 | break; |
135 | usleep_range(min: 500, max: 750); |
136 | } |
137 | if (i >= max_wait) |
138 | return -EIO; |
139 | if (result) |
140 | *result = v; |
141 | return 0; |
142 | } |
143 | |
144 | /* send [pre-]translated i2c msgs stored at addr */ |
145 | static int send_i2c_cmd(struct pt3_board *pt3, u32 addr) |
146 | { |
147 | u32 ret; |
148 | |
149 | /* make sure that previous transactions had finished */ |
150 | if (wait_i2c_result(pt3, NULL, max_wait: 50)) { |
151 | dev_warn(&pt3->pdev->dev, "(%s) prev. transaction stalled\n" , |
152 | __func__); |
153 | return -EIO; |
154 | } |
155 | |
156 | iowrite32(PT3_I2C_RUN | addr, pt3->regs[0] + REG_I2C_W); |
157 | usleep_range(min: 200, max: 300); |
158 | /* wait for the current transaction to finish */ |
159 | if (wait_i2c_result(pt3, result: &ret, max_wait: 500) || (ret & STAT_SEQ_ERROR)) { |
160 | dev_warn(&pt3->pdev->dev, "(%s) failed.\n" , __func__); |
161 | return -EIO; |
162 | } |
163 | return 0; |
164 | } |
165 | |
166 | |
167 | /* init commands for each demod are combined into one transaction |
168 | * and hidden in ROM with the address PT3_CMD_ADDR_INIT_DEMOD. |
169 | */ |
170 | int pt3_init_all_demods(struct pt3_board *pt3) |
171 | { |
172 | ioread32(pt3->regs[0] + REG_I2C_R); |
173 | return send_i2c_cmd(pt3, PT3_CMD_ADDR_INIT_DEMOD); |
174 | } |
175 | |
176 | /* init commands for two ISDB-T tuners are hidden in ROM. */ |
177 | int pt3_init_all_mxl301rf(struct pt3_board *pt3) |
178 | { |
179 | usleep_range(min: 1000, max: 2000); |
180 | return send_i2c_cmd(pt3, PT3_CMD_ADDR_INIT_TUNER); |
181 | } |
182 | |
183 | void pt3_i2c_reset(struct pt3_board *pt3) |
184 | { |
185 | iowrite32(PT3_I2C_RESET, pt3->regs[0] + REG_I2C_W); |
186 | } |
187 | |
188 | /* |
189 | * I2C algorithm |
190 | */ |
191 | int |
192 | pt3_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) |
193 | { |
194 | struct pt3_board *pt3; |
195 | struct pt3_i2cbuf *cbuf; |
196 | int i; |
197 | void __iomem *p; |
198 | |
199 | pt3 = i2c_get_adapdata(adap); |
200 | cbuf = pt3->i2c_buf; |
201 | |
202 | for (i = 0; i < num; i++) |
203 | if (msgs[i].flags & I2C_M_RECV_LEN) { |
204 | dev_warn(&pt3->pdev->dev, |
205 | "(%s) I2C_M_RECV_LEN not supported.\n" , |
206 | __func__); |
207 | return -EINVAL; |
208 | } |
209 | |
210 | translate(cbuf, msgs, num); |
211 | memcpy_toio(pt3->regs[1] + PT3_I2C_BASE + PT3_CMD_ADDR_NORMAL / 2, |
212 | cbuf->data, cbuf->num_cmds); |
213 | |
214 | if (send_i2c_cmd(pt3, PT3_CMD_ADDR_NORMAL) < 0) |
215 | return -EIO; |
216 | |
217 | p = pt3->regs[1] + PT3_I2C_BASE; |
218 | for (i = 0; i < num; i++) |
219 | if ((msgs[i].flags & I2C_M_RD) && msgs[i].len > 0) { |
220 | memcpy_fromio(msgs[i].buf, p, msgs[i].len); |
221 | p += msgs[i].len; |
222 | } |
223 | |
224 | return num; |
225 | } |
226 | |
227 | u32 pt3_i2c_functionality(struct i2c_adapter *adap) |
228 | { |
229 | return I2C_FUNC_I2C; |
230 | } |
231 | |