This source file includes following definitions.
- v3020_mmio_map
- v3020_mmio_unmap
- v3020_mmio_write_bit
- v3020_mmio_read_bit
- v3020_gpio_map
- v3020_gpio_unmap
- v3020_gpio_write_bit
- v3020_gpio_read_bit
- v3020_set_reg
- v3020_get_reg
- v3020_read_time
- v3020_set_time
- rtc_probe
- rtc_remove
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18 #include <linux/platform_device.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/rtc.h>
22 #include <linux/types.h>
23 #include <linux/bcd.h>
24 #include <linux/platform_data/rtc-v3020.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
27 #include <linux/slab.h>
28
29 #include <linux/io.h>
30
31 #undef DEBUG
32
33 struct v3020;
34
35 struct v3020_chip_ops {
36 int (*map_io)(struct v3020 *chip, struct platform_device *pdev,
37 struct v3020_platform_data *pdata);
38 void (*unmap_io)(struct v3020 *chip);
39 unsigned char (*read_bit)(struct v3020 *chip);
40 void (*write_bit)(struct v3020 *chip, unsigned char bit);
41 };
42
43 #define V3020_CS 0
44 #define V3020_WR 1
45 #define V3020_RD 2
46 #define V3020_IO 3
47
48 struct v3020 {
49
50 void __iomem *ioaddress;
51 int leftshift;
52
53
54 struct gpio *gpio;
55
56 const struct v3020_chip_ops *ops;
57
58 struct rtc_device *rtc;
59 };
60
61
62 static int v3020_mmio_map(struct v3020 *chip, struct platform_device *pdev,
63 struct v3020_platform_data *pdata)
64 {
65 if (pdev->num_resources != 1)
66 return -EBUSY;
67
68 if (pdev->resource[0].flags != IORESOURCE_MEM)
69 return -EBUSY;
70
71 chip->leftshift = pdata->leftshift;
72 chip->ioaddress = ioremap(pdev->resource[0].start, 1);
73 if (chip->ioaddress == NULL)
74 return -EBUSY;
75
76 return 0;
77 }
78
79 static void v3020_mmio_unmap(struct v3020 *chip)
80 {
81 iounmap(chip->ioaddress);
82 }
83
84 static void v3020_mmio_write_bit(struct v3020 *chip, unsigned char bit)
85 {
86 writel(bit << chip->leftshift, chip->ioaddress);
87 }
88
89 static unsigned char v3020_mmio_read_bit(struct v3020 *chip)
90 {
91 return !!(readl(chip->ioaddress) & (1 << chip->leftshift));
92 }
93
94 static const struct v3020_chip_ops v3020_mmio_ops = {
95 .map_io = v3020_mmio_map,
96 .unmap_io = v3020_mmio_unmap,
97 .read_bit = v3020_mmio_read_bit,
98 .write_bit = v3020_mmio_write_bit,
99 };
100
101 static struct gpio v3020_gpio[] = {
102 { 0, GPIOF_OUT_INIT_HIGH, "RTC CS"},
103 { 0, GPIOF_OUT_INIT_HIGH, "RTC WR"},
104 { 0, GPIOF_OUT_INIT_HIGH, "RTC RD"},
105 { 0, GPIOF_OUT_INIT_HIGH, "RTC IO"},
106 };
107
108 static int v3020_gpio_map(struct v3020 *chip, struct platform_device *pdev,
109 struct v3020_platform_data *pdata)
110 {
111 int err;
112
113 v3020_gpio[V3020_CS].gpio = pdata->gpio_cs;
114 v3020_gpio[V3020_WR].gpio = pdata->gpio_wr;
115 v3020_gpio[V3020_RD].gpio = pdata->gpio_rd;
116 v3020_gpio[V3020_IO].gpio = pdata->gpio_io;
117
118 err = gpio_request_array(v3020_gpio, ARRAY_SIZE(v3020_gpio));
119
120 if (!err)
121 chip->gpio = v3020_gpio;
122
123 return err;
124 }
125
126 static void v3020_gpio_unmap(struct v3020 *chip)
127 {
128 gpio_free_array(v3020_gpio, ARRAY_SIZE(v3020_gpio));
129 }
130
131 static void v3020_gpio_write_bit(struct v3020 *chip, unsigned char bit)
132 {
133 gpio_direction_output(chip->gpio[V3020_IO].gpio, bit);
134 gpio_set_value(chip->gpio[V3020_CS].gpio, 0);
135 gpio_set_value(chip->gpio[V3020_WR].gpio, 0);
136 udelay(1);
137 gpio_set_value(chip->gpio[V3020_WR].gpio, 1);
138 gpio_set_value(chip->gpio[V3020_CS].gpio, 1);
139 }
140
141 static unsigned char v3020_gpio_read_bit(struct v3020 *chip)
142 {
143 int bit;
144
145 gpio_direction_input(chip->gpio[V3020_IO].gpio);
146 gpio_set_value(chip->gpio[V3020_CS].gpio, 0);
147 gpio_set_value(chip->gpio[V3020_RD].gpio, 0);
148 udelay(1);
149 bit = !!gpio_get_value(chip->gpio[V3020_IO].gpio);
150 udelay(1);
151 gpio_set_value(chip->gpio[V3020_RD].gpio, 1);
152 gpio_set_value(chip->gpio[V3020_CS].gpio, 1);
153
154 return bit;
155 }
156
157 static const struct v3020_chip_ops v3020_gpio_ops = {
158 .map_io = v3020_gpio_map,
159 .unmap_io = v3020_gpio_unmap,
160 .read_bit = v3020_gpio_read_bit,
161 .write_bit = v3020_gpio_write_bit,
162 };
163
164 static void v3020_set_reg(struct v3020 *chip, unsigned char address,
165 unsigned char data)
166 {
167 int i;
168 unsigned char tmp;
169
170 tmp = address;
171 for (i = 0; i < 4; i++) {
172 chip->ops->write_bit(chip, (tmp & 1));
173 tmp >>= 1;
174 udelay(1);
175 }
176
177
178 if (!V3020_IS_COMMAND(address)) {
179 for (i = 0; i < 8; i++) {
180 chip->ops->write_bit(chip, (data & 1));
181 data >>= 1;
182 udelay(1);
183 }
184 }
185 }
186
187 static unsigned char v3020_get_reg(struct v3020 *chip, unsigned char address)
188 {
189 unsigned int data = 0;
190 int i;
191
192 for (i = 0; i < 4; i++) {
193 chip->ops->write_bit(chip, (address & 1));
194 address >>= 1;
195 udelay(1);
196 }
197
198 for (i = 0; i < 8; i++) {
199 data >>= 1;
200 if (chip->ops->read_bit(chip))
201 data |= 0x80;
202 udelay(1);
203 }
204
205 return data;
206 }
207
208 static int v3020_read_time(struct device *dev, struct rtc_time *dt)
209 {
210 struct v3020 *chip = dev_get_drvdata(dev);
211 int tmp;
212
213
214 v3020_set_reg(chip, V3020_CMD_CLOCK2RAM, 0);
215
216
217 tmp = v3020_get_reg(chip, V3020_SECONDS);
218 dt->tm_sec = bcd2bin(tmp);
219 tmp = v3020_get_reg(chip, V3020_MINUTES);
220 dt->tm_min = bcd2bin(tmp);
221 tmp = v3020_get_reg(chip, V3020_HOURS);
222 dt->tm_hour = bcd2bin(tmp);
223 tmp = v3020_get_reg(chip, V3020_MONTH_DAY);
224 dt->tm_mday = bcd2bin(tmp);
225 tmp = v3020_get_reg(chip, V3020_MONTH);
226 dt->tm_mon = bcd2bin(tmp) - 1;
227 tmp = v3020_get_reg(chip, V3020_WEEK_DAY);
228 dt->tm_wday = bcd2bin(tmp);
229 tmp = v3020_get_reg(chip, V3020_YEAR);
230 dt->tm_year = bcd2bin(tmp)+100;
231
232 dev_dbg(dev, "\n%s : Read RTC values\n", __func__);
233 dev_dbg(dev, "tm_hour: %i\n", dt->tm_hour);
234 dev_dbg(dev, "tm_min : %i\n", dt->tm_min);
235 dev_dbg(dev, "tm_sec : %i\n", dt->tm_sec);
236 dev_dbg(dev, "tm_year: %i\n", dt->tm_year);
237 dev_dbg(dev, "tm_mon : %i\n", dt->tm_mon);
238 dev_dbg(dev, "tm_mday: %i\n", dt->tm_mday);
239 dev_dbg(dev, "tm_wday: %i\n", dt->tm_wday);
240
241 return 0;
242 }
243
244
245 static int v3020_set_time(struct device *dev, struct rtc_time *dt)
246 {
247 struct v3020 *chip = dev_get_drvdata(dev);
248
249 dev_dbg(dev, "\n%s : Setting RTC values\n", __func__);
250 dev_dbg(dev, "tm_sec : %i\n", dt->tm_sec);
251 dev_dbg(dev, "tm_min : %i\n", dt->tm_min);
252 dev_dbg(dev, "tm_hour: %i\n", dt->tm_hour);
253 dev_dbg(dev, "tm_mday: %i\n", dt->tm_mday);
254 dev_dbg(dev, "tm_wday: %i\n", dt->tm_wday);
255 dev_dbg(dev, "tm_year: %i\n", dt->tm_year);
256
257
258 v3020_set_reg(chip, V3020_SECONDS, bin2bcd(dt->tm_sec));
259 v3020_set_reg(chip, V3020_MINUTES, bin2bcd(dt->tm_min));
260 v3020_set_reg(chip, V3020_HOURS, bin2bcd(dt->tm_hour));
261 v3020_set_reg(chip, V3020_MONTH_DAY, bin2bcd(dt->tm_mday));
262 v3020_set_reg(chip, V3020_MONTH, bin2bcd(dt->tm_mon + 1));
263 v3020_set_reg(chip, V3020_WEEK_DAY, bin2bcd(dt->tm_wday));
264 v3020_set_reg(chip, V3020_YEAR, bin2bcd(dt->tm_year % 100));
265
266
267 v3020_set_reg(chip, V3020_CMD_RAM2CLOCK, 0);
268
269
270
271
272
273 return 0;
274 }
275
276 static const struct rtc_class_ops v3020_rtc_ops = {
277 .read_time = v3020_read_time,
278 .set_time = v3020_set_time,
279 };
280
281 static int rtc_probe(struct platform_device *pdev)
282 {
283 struct v3020_platform_data *pdata = dev_get_platdata(&pdev->dev);
284 struct v3020 *chip;
285 int retval = -EBUSY;
286 int i;
287 int temp;
288
289 chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
290 if (!chip)
291 return -ENOMEM;
292
293 if (pdata->use_gpio)
294 chip->ops = &v3020_gpio_ops;
295 else
296 chip->ops = &v3020_mmio_ops;
297
298 retval = chip->ops->map_io(chip, pdev, pdata);
299 if (retval)
300 return retval;
301
302
303
304 for (i = 0; i < 8; i++)
305 temp = chip->ops->read_bit(chip);
306
307
308
309 v3020_set_reg(chip, V3020_SECONDS, 0x33);
310 if (v3020_get_reg(chip, V3020_SECONDS) != 0x33) {
311 retval = -ENODEV;
312 goto err_io;
313 }
314
315
316
317 v3020_set_reg(chip, V3020_STATUS_0, 0x0);
318
319 if (pdata->use_gpio)
320 dev_info(&pdev->dev, "Chip available at GPIOs "
321 "%d, %d, %d, %d\n",
322 chip->gpio[V3020_CS].gpio, chip->gpio[V3020_WR].gpio,
323 chip->gpio[V3020_RD].gpio, chip->gpio[V3020_IO].gpio);
324 else
325 dev_info(&pdev->dev, "Chip available at "
326 "physical address 0x%llx,"
327 "data connected to D%d\n",
328 (unsigned long long)pdev->resource[0].start,
329 chip->leftshift);
330
331 platform_set_drvdata(pdev, chip);
332
333 chip->rtc = devm_rtc_device_register(&pdev->dev, "v3020",
334 &v3020_rtc_ops, THIS_MODULE);
335 if (IS_ERR(chip->rtc)) {
336 retval = PTR_ERR(chip->rtc);
337 goto err_io;
338 }
339
340 return 0;
341
342 err_io:
343 chip->ops->unmap_io(chip);
344
345 return retval;
346 }
347
348 static int rtc_remove(struct platform_device *dev)
349 {
350 struct v3020 *chip = platform_get_drvdata(dev);
351
352 chip->ops->unmap_io(chip);
353
354 return 0;
355 }
356
357 static struct platform_driver rtc_device_driver = {
358 .probe = rtc_probe,
359 .remove = rtc_remove,
360 .driver = {
361 .name = "v3020",
362 },
363 };
364
365 module_platform_driver(rtc_device_driver);
366
367 MODULE_DESCRIPTION("V3020 RTC");
368 MODULE_AUTHOR("Raphael Assenat");
369 MODULE_LICENSE("GPL");
370 MODULE_ALIAS("platform:v3020");