1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
|
// SPDX-License-Identifier: GPL-2.0
/*
* PFSM (Pre-configurable Finite State Machine) driver for TI TPS65224/TPS6594/TPS6593/LP8764 PMICs
*
* Copyright (C) 2023 BayLibre Incorporated - https://www.baylibre.com/
*/
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/ioctl.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/tps6594.h>
#include <linux/tps6594_pfsm.h>
#define TPS6594_STARTUP_DEST_MCU_ONLY_VAL 2
#define TPS6594_STARTUP_DEST_ACTIVE_VAL 3
#define TPS6594_STARTUP_DEST_SHIFT 5
#define TPS6594_STARTUP_DEST_MCU_ONLY (TPS6594_STARTUP_DEST_MCU_ONLY_VAL \
<< TPS6594_STARTUP_DEST_SHIFT)
#define TPS6594_STARTUP_DEST_ACTIVE (TPS6594_STARTUP_DEST_ACTIVE_VAL \
<< TPS6594_STARTUP_DEST_SHIFT)
/*
* To update the PMIC firmware, the user must be able to access
* page 0 (user registers) and page 1 (NVM control and configuration).
*/
#define TPS6594_PMIC_MAX_POS 0x200
#define TPS6594_FILE_TO_PFSM(f) container_of((f)->private_data, struct tps6594_pfsm, miscdev)
/**
* struct tps6594_pfsm - device private data structure
*
* @miscdev: misc device infos
* @regmap: regmap for accessing the device registers
* @chip_id: chip identifier of the device
*/
struct tps6594_pfsm {
struct miscdevice miscdev;
struct regmap *regmap;
unsigned long chip_id;
};
static ssize_t tps6594_pfsm_read(struct file *f, char __user *buf,
size_t count, loff_t *ppos)
{
struct tps6594_pfsm *pfsm = TPS6594_FILE_TO_PFSM(f);
loff_t pos = *ppos;
unsigned int val;
int ret;
int i;
if (pos < 0)
return -EINVAL;
if (pos >= TPS6594_PMIC_MAX_POS)
return 0;
if (count > TPS6594_PMIC_MAX_POS - pos)
count = TPS6594_PMIC_MAX_POS - pos;
for (i = 0 ; i < count ; i++) {
ret = regmap_read(pfsm->regmap, pos + i, &val);
if (ret)
return ret;
if (put_user(val, buf + i))
return -EFAULT;
}
*ppos = pos + count;
return count;
}
static ssize_t tps6594_pfsm_write(struct file *f, const char __user *buf,
size_t count, loff_t *ppos)
{
struct tps6594_pfsm *pfsm = TPS6594_FILE_TO_PFSM(f);
loff_t pos = *ppos;
char val;
int ret;
int i;
if (pos < 0)
return -EINVAL;
if (pos >= TPS6594_PMIC_MAX_POS || !count)
return 0;
if (count > TPS6594_PMIC_MAX_POS - pos)
count = TPS6594_PMIC_MAX_POS - pos;
for (i = 0 ; i < count ; i++) {
if (get_user(val, buf + i))
return -EFAULT;
ret = regmap_write(pfsm->regmap, pos + i, val);
if (ret)
return ret;
}
*ppos = pos + count;
return count;
}
static int tps6594_pfsm_configure_ret_trig(struct regmap *regmap, u8 gpio_ret, u8 ddr_ret)
{
int ret;
if (gpio_ret)
ret = regmap_set_bits(regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
TPS6594_BIT_TRIGGER_I2C(5) | TPS6594_BIT_TRIGGER_I2C(6));
else
ret = regmap_clear_bits(regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
TPS6594_BIT_TRIGGER_I2C(5) | TPS6594_BIT_TRIGGER_I2C(6));
if (ret)
return ret;
if (ddr_ret)
ret = regmap_set_bits(regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
TPS6594_BIT_TRIGGER_I2C(7));
else
ret = regmap_clear_bits(regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
TPS6594_BIT_TRIGGER_I2C(7));
return ret;
}
static long tps6594_pfsm_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
{
struct tps6594_pfsm *pfsm = TPS6594_FILE_TO_PFSM(f);
struct pmic_state_opt state_opt;
void __user *argp = (void __user *)arg;
unsigned int regmap_reg, mask;
int ret = -ENOIOCTLCMD;
switch (cmd) {
case PMIC_GOTO_STANDBY:
/* Disable LP mode on TPS6594 Family PMIC */
if (pfsm->chip_id != TPS65224) {
ret = regmap_clear_bits(pfsm->regmap, TPS6594_REG_RTC_CTRL_2,
TPS6594_BIT_LP_STANDBY_SEL);
if (ret)
return ret;
}
/* Force trigger */
ret = regmap_write_bits(pfsm->regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
TPS6594_BIT_TRIGGER_I2C(0), TPS6594_BIT_TRIGGER_I2C(0));
break;
case PMIC_GOTO_LP_STANDBY:
/* TPS65224 does not support LP STANDBY */
if (pfsm->chip_id == TPS65224)
return ret;
/* Enable LP mode */
ret = regmap_set_bits(pfsm->regmap, TPS6594_REG_RTC_CTRL_2,
TPS6594_BIT_LP_STANDBY_SEL);
if (ret)
return ret;
/* Force trigger */
ret = regmap_write_bits(pfsm->regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
TPS6594_BIT_TRIGGER_I2C(0), TPS6594_BIT_TRIGGER_I2C(0));
break;
case PMIC_UPDATE_PGM:
/* Force trigger */
ret = regmap_write_bits(pfsm->regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
TPS6594_BIT_TRIGGER_I2C(3), TPS6594_BIT_TRIGGER_I2C(3));
break;
case PMIC_SET_ACTIVE_STATE:
/* Modify NSLEEP1-2 bits */
ret = regmap_set_bits(pfsm->regmap, TPS6594_REG_FSM_NSLEEP_TRIGGERS,
TPS6594_BIT_NSLEEP1B | TPS6594_BIT_NSLEEP2B);
break;
case PMIC_SET_MCU_ONLY_STATE:
/* TPS65224 does not support MCU_ONLY_STATE */
if (pfsm->chip_id == TPS65224)
return ret;
if (copy_from_user(&state_opt, argp, sizeof(state_opt)))
return -EFAULT;
/* Configure retention triggers */
ret = tps6594_pfsm_configure_ret_trig(pfsm->regmap, state_opt.gpio_retention,
state_opt.ddr_retention);
if (ret)
return ret;
/* Modify NSLEEP1-2 bits */
ret = regmap_clear_bits(pfsm->regmap, TPS6594_REG_FSM_NSLEEP_TRIGGERS,
TPS6594_BIT_NSLEEP1B);
if (ret)
return ret;
ret = regmap_set_bits(pfsm->regmap, TPS6594_REG_FSM_NSLEEP_TRIGGERS,
TPS6594_BIT_NSLEEP2B);
break;
case PMIC_SET_RETENTION_STATE:
if (copy_from_user(&state_opt, argp, sizeof(state_opt)))
return -EFAULT;
/* Configure wake-up destination */
if (pfsm->chip_id == TPS65224) {
regmap_reg = TPS65224_REG_STARTUP_CTRL;
mask = TPS65224_MASK_STARTUP_DEST;
} else {
regmap_reg = TPS6594_REG_RTC_CTRL_2;
mask = TPS6594_MASK_STARTUP_DEST;
}
if (state_opt.mcu_only_startup_dest)
ret = regmap_write_bits(pfsm->regmap, regmap_reg,
mask, TPS6594_STARTUP_DEST_MCU_ONLY);
else
ret = regmap_write_bits(pfsm->regmap, regmap_reg,
mask, TPS6594_STARTUP_DEST_ACTIVE);
if (ret)
return ret;
/* Configure retention triggers */
ret = tps6594_pfsm_configure_ret_trig(pfsm->regmap, state_opt.gpio_retention,
state_opt.ddr_retention);
if (ret)
return ret;
/* Modify NSLEEP1-2 bits */
ret = regmap_clear_bits(pfsm->regmap, TPS6594_REG_FSM_NSLEEP_TRIGGERS,
pfsm->chip_id == TPS65224 ?
TPS6594_BIT_NSLEEP1B : TPS6594_BIT_NSLEEP2B);
break;
}
return ret;
}
static const struct file_operations tps6594_pfsm_fops = {
.owner = THIS_MODULE,
.llseek = generic_file_llseek,
.read = tps6594_pfsm_read,
.write = tps6594_pfsm_write,
.unlocked_ioctl = tps6594_pfsm_ioctl,
.compat_ioctl = compat_ptr_ioctl,
};
static irqreturn_t tps6594_pfsm_isr(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
int i;
for (i = 0 ; i < pdev->num_resources ; i++) {
if (irq == platform_get_irq_byname(pdev, pdev->resource[i].name)) {
dev_err(pdev->dev.parent, "%s event detected\n", pdev->resource[i].name);
return IRQ_HANDLED;
}
}
return IRQ_NONE;
}
static int tps6594_pfsm_probe(struct platform_device *pdev)
{
struct tps6594_pfsm *pfsm;
struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
int irq;
int ret;
int i;
pfsm = devm_kzalloc(dev, sizeof(struct tps6594_pfsm), GFP_KERNEL);
if (!pfsm)
return -ENOMEM;
pfsm->regmap = tps->regmap;
pfsm->miscdev.minor = MISC_DYNAMIC_MINOR;
pfsm->miscdev.name = devm_kasprintf(dev, GFP_KERNEL, "pfsm-%ld-0x%02x",
tps->chip_id, tps->reg);
pfsm->miscdev.fops = &tps6594_pfsm_fops;
pfsm->miscdev.parent = dev->parent;
pfsm->chip_id = tps->chip_id;
for (i = 0 ; i < pdev->num_resources ; i++) {
irq = platform_get_irq_byname(pdev, pdev->resource[i].name);
if (irq < 0)
return irq;
ret = devm_request_threaded_irq(dev, irq, NULL,
tps6594_pfsm_isr, IRQF_ONESHOT,
pdev->resource[i].name, pdev);
if (ret)
return dev_err_probe(dev, ret, "Failed to request irq\n");
}
platform_set_drvdata(pdev, pfsm);
return misc_register(&pfsm->miscdev);
}
static void tps6594_pfsm_remove(struct platform_device *pdev)
{
struct tps6594_pfsm *pfsm = platform_get_drvdata(pdev);
misc_deregister(&pfsm->miscdev);
}
static struct platform_driver tps6594_pfsm_driver = {
.driver = {
.name = "tps6594-pfsm",
},
.probe = tps6594_pfsm_probe,
.remove = tps6594_pfsm_remove,
};
module_platform_driver(tps6594_pfsm_driver);
MODULE_ALIAS("platform:tps6594-pfsm");
MODULE_AUTHOR("Julien Panis <jpanis@baylibre.com>");
MODULE_DESCRIPTION("TPS6594 Pre-configurable Finite State Machine Driver");
MODULE_LICENSE("GPL");
|