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16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/err.h>
19#include <linux/io.h>
20#include <linux/clk.h>
21#include <linux/regmap.h>
22#include <linux/mfd/core.h>
23#include <linux/pm_runtime.h>
24#include <linux/of.h>
25#include <linux/of_device.h>
26#include <linux/sched.h>
27
28#include <linux/mfd/ti_am335x_tscadc.h>
29
30static unsigned int tscadc_readl(struct ti_tscadc_dev *tsadc, unsigned int reg)
31{
32 unsigned int val;
33
34 regmap_read(tsadc->regmap_tscadc, reg, &val);
35 return val;
36}
37
38static void tscadc_writel(struct ti_tscadc_dev *tsadc, unsigned int reg,
39 unsigned int val)
40{
41 regmap_write(tsadc->regmap_tscadc, reg, val);
42}
43
44static const struct regmap_config tscadc_regmap_config = {
45 .name = "ti_tscadc",
46 .reg_bits = 32,
47 .reg_stride = 4,
48 .val_bits = 32,
49};
50
51void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tsadc, u32 val)
52{
53 unsigned long flags;
54
55 spin_lock_irqsave(&tsadc->reg_lock, flags);
56 tsadc->reg_se_cache |= val;
57 if (tsadc->adc_waiting)
58 wake_up(&tsadc->reg_se_wait);
59 else if (!tsadc->adc_in_use)
60 tscadc_writel(tsadc, REG_SE, tsadc->reg_se_cache);
61
62 spin_unlock_irqrestore(&tsadc->reg_lock, flags);
63}
64EXPORT_SYMBOL_GPL(am335x_tsc_se_set_cache);
65
66static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc)
67{
68 DEFINE_WAIT(wait);
69 u32 reg;
70
71 reg = tscadc_readl(tsadc, REG_ADCFSM);
72 if (reg & SEQ_STATUS) {
73 tsadc->adc_waiting = true;
74 prepare_to_wait(&tsadc->reg_se_wait, &wait,
75 TASK_UNINTERRUPTIBLE);
76 spin_unlock_irq(&tsadc->reg_lock);
77
78 schedule();
79
80 spin_lock_irq(&tsadc->reg_lock);
81 finish_wait(&tsadc->reg_se_wait, &wait);
82
83
84
85
86
87 reg = tscadc_readl(tsadc, REG_ADCFSM);
88 WARN_ON((reg & SEQ_STATUS) && !(reg & CHARGE_STEP));
89 tsadc->adc_waiting = false;
90 }
91 tsadc->adc_in_use = true;
92}
93
94void am335x_tsc_se_set_once(struct ti_tscadc_dev *tsadc, u32 val)
95{
96 spin_lock_irq(&tsadc->reg_lock);
97 am335x_tscadc_need_adc(tsadc);
98
99 tscadc_writel(tsadc, REG_SE, val);
100 spin_unlock_irq(&tsadc->reg_lock);
101}
102EXPORT_SYMBOL_GPL(am335x_tsc_se_set_once);
103
104void am335x_tsc_se_adc_done(struct ti_tscadc_dev *tsadc)
105{
106 unsigned long flags;
107
108 spin_lock_irqsave(&tsadc->reg_lock, flags);
109 tsadc->adc_in_use = false;
110 tscadc_writel(tsadc, REG_SE, tsadc->reg_se_cache);
111 spin_unlock_irqrestore(&tsadc->reg_lock, flags);
112}
113EXPORT_SYMBOL_GPL(am335x_tsc_se_adc_done);
114
115void am335x_tsc_se_clr(struct ti_tscadc_dev *tsadc, u32 val)
116{
117 unsigned long flags;
118
119 spin_lock_irqsave(&tsadc->reg_lock, flags);
120 tsadc->reg_se_cache &= ~val;
121 tscadc_writel(tsadc, REG_SE, tsadc->reg_se_cache);
122 spin_unlock_irqrestore(&tsadc->reg_lock, flags);
123}
124EXPORT_SYMBOL_GPL(am335x_tsc_se_clr);
125
126static void tscadc_idle_config(struct ti_tscadc_dev *config)
127{
128 unsigned int idleconfig;
129
130 idleconfig = STEPCONFIG_YNN | STEPCONFIG_INM_ADCREFM |
131 STEPCONFIG_INP_ADCREFM | STEPCONFIG_YPN;
132
133 tscadc_writel(config, REG_IDLECONFIG, idleconfig);
134}
135
136static int ti_tscadc_probe(struct platform_device *pdev)
137{
138 struct ti_tscadc_dev *tscadc;
139 struct resource *res;
140 struct clk *clk;
141 struct device_node *node = pdev->dev.of_node;
142 struct mfd_cell *cell;
143 struct property *prop;
144 const __be32 *cur;
145 u32 val;
146 int err, ctrl;
147 int clock_rate;
148 int tsc_wires = 0, adc_channels = 0, total_channels;
149 int readouts = 0;
150
151 if (!pdev->dev.of_node) {
152 dev_err(&pdev->dev, "Could not find valid DT data.\n");
153 return -EINVAL;
154 }
155
156 node = of_get_child_by_name(pdev->dev.of_node, "tsc");
157 of_property_read_u32(node, "ti,wires", &tsc_wires);
158 of_property_read_u32(node, "ti,coordiante-readouts", &readouts);
159
160 node = of_get_child_by_name(pdev->dev.of_node, "adc");
161 of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) {
162 adc_channels++;
163 if (val > 7) {
164 dev_err(&pdev->dev, " PIN numbers are 0..7 (not %d)\n",
165 val);
166 return -EINVAL;
167 }
168 }
169 total_channels = tsc_wires + adc_channels;
170 if (total_channels > 8) {
171 dev_err(&pdev->dev, "Number of i/p channels more than 8\n");
172 return -EINVAL;
173 }
174 if (total_channels == 0) {
175 dev_err(&pdev->dev, "Need atleast one channel.\n");
176 return -EINVAL;
177 }
178
179 if (readouts * 2 + 2 + adc_channels > 16) {
180 dev_err(&pdev->dev, "Too many step configurations requested\n");
181 return -EINVAL;
182 }
183
184
185 tscadc = devm_kzalloc(&pdev->dev,
186 sizeof(struct ti_tscadc_dev), GFP_KERNEL);
187 if (!tscadc) {
188 dev_err(&pdev->dev, "failed to allocate memory.\n");
189 return -ENOMEM;
190 }
191 tscadc->dev = &pdev->dev;
192
193 err = platform_get_irq(pdev, 0);
194 if (err < 0) {
195 dev_err(&pdev->dev, "no irq ID is specified.\n");
196 goto ret;
197 } else
198 tscadc->irq = err;
199
200 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
201 tscadc->tscadc_base = devm_ioremap_resource(&pdev->dev, res);
202 if (IS_ERR(tscadc->tscadc_base))
203 return PTR_ERR(tscadc->tscadc_base);
204
205 tscadc->regmap_tscadc = devm_regmap_init_mmio(&pdev->dev,
206 tscadc->tscadc_base, &tscadc_regmap_config);
207 if (IS_ERR(tscadc->regmap_tscadc)) {
208 dev_err(&pdev->dev, "regmap init failed\n");
209 err = PTR_ERR(tscadc->regmap_tscadc);
210 goto ret;
211 }
212
213 spin_lock_init(&tscadc->reg_lock);
214 init_waitqueue_head(&tscadc->reg_se_wait);
215
216 pm_runtime_enable(&pdev->dev);
217 pm_runtime_get_sync(&pdev->dev);
218
219
220
221
222
223
224
225
226
227 clk = clk_get(&pdev->dev, "adc_tsc_fck");
228 if (IS_ERR(clk)) {
229 dev_err(&pdev->dev, "failed to get TSC fck\n");
230 err = PTR_ERR(clk);
231 goto err_disable_clk;
232 }
233 clock_rate = clk_get_rate(clk);
234 clk_put(clk);
235 tscadc->clk_div = clock_rate / ADC_CLK;
236
237
238 tscadc->clk_div--;
239 tscadc_writel(tscadc, REG_CLKDIV, tscadc->clk_div);
240
241
242 ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID;
243 tscadc_writel(tscadc, REG_CTRL, ctrl);
244
245
246 if (tsc_wires > 0) {
247 tscadc->tsc_wires = tsc_wires;
248 if (tsc_wires == 5)
249 ctrl |= CNTRLREG_5WIRE | CNTRLREG_TSCENB;
250 else
251 ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB;
252 tscadc_idle_config(tscadc);
253 }
254
255
256 ctrl |= CNTRLREG_TSCSSENB;
257 tscadc_writel(tscadc, REG_CTRL, ctrl);
258
259 tscadc->used_cells = 0;
260 tscadc->tsc_cell = -1;
261 tscadc->adc_cell = -1;
262
263
264 if (tsc_wires > 0) {
265 tscadc->tsc_cell = tscadc->used_cells;
266 cell = &tscadc->cells[tscadc->used_cells++];
267 cell->name = "TI-am335x-tsc";
268 cell->of_compatible = "ti,am3359-tsc";
269 cell->platform_data = &tscadc;
270 cell->pdata_size = sizeof(tscadc);
271 }
272
273
274 if (adc_channels > 0) {
275 tscadc->adc_cell = tscadc->used_cells;
276 cell = &tscadc->cells[tscadc->used_cells++];
277 cell->name = "TI-am335x-adc";
278 cell->of_compatible = "ti,am3359-adc";
279 cell->platform_data = &tscadc;
280 cell->pdata_size = sizeof(tscadc);
281 }
282
283 err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells,
284 tscadc->used_cells, NULL, 0, NULL);
285 if (err < 0)
286 goto err_disable_clk;
287
288 device_init_wakeup(&pdev->dev, true);
289 platform_set_drvdata(pdev, tscadc);
290 return 0;
291
292err_disable_clk:
293 pm_runtime_put_sync(&pdev->dev);
294 pm_runtime_disable(&pdev->dev);
295ret:
296 return err;
297}
298
299static int ti_tscadc_remove(struct platform_device *pdev)
300{
301 struct ti_tscadc_dev *tscadc = platform_get_drvdata(pdev);
302
303 tscadc_writel(tscadc, REG_SE, 0x00);
304
305 pm_runtime_put_sync(&pdev->dev);
306 pm_runtime_disable(&pdev->dev);
307
308 mfd_remove_devices(tscadc->dev);
309
310 return 0;
311}
312
313#ifdef CONFIG_PM
314static int tscadc_suspend(struct device *dev)
315{
316 struct ti_tscadc_dev *tscadc_dev = dev_get_drvdata(dev);
317
318 tscadc_writel(tscadc_dev, REG_SE, 0x00);
319 pm_runtime_put_sync(dev);
320
321 return 0;
322}
323
324static int tscadc_resume(struct device *dev)
325{
326 struct ti_tscadc_dev *tscadc_dev = dev_get_drvdata(dev);
327 u32 ctrl;
328
329 pm_runtime_get_sync(dev);
330
331
332 ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID;
333 tscadc_writel(tscadc_dev, REG_CTRL, ctrl);
334
335 if (tscadc_dev->tsc_cell != -1) {
336 if (tscadc_dev->tsc_wires == 5)
337 ctrl |= CNTRLREG_5WIRE | CNTRLREG_TSCENB;
338 else
339 ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB;
340 tscadc_idle_config(tscadc_dev);
341 }
342 ctrl |= CNTRLREG_TSCSSENB;
343 tscadc_writel(tscadc_dev, REG_CTRL, ctrl);
344
345 tscadc_writel(tscadc_dev, REG_CLKDIV, tscadc_dev->clk_div);
346
347 return 0;
348}
349
350static const struct dev_pm_ops tscadc_pm_ops = {
351 .suspend = tscadc_suspend,
352 .resume = tscadc_resume,
353};
354#define TSCADC_PM_OPS (&tscadc_pm_ops)
355#else
356#define TSCADC_PM_OPS NULL
357#endif
358
359static const struct of_device_id ti_tscadc_dt_ids[] = {
360 { .compatible = "ti,am3359-tscadc", },
361 { }
362};
363MODULE_DEVICE_TABLE(of, ti_tscadc_dt_ids);
364
365static struct platform_driver ti_tscadc_driver = {
366 .driver = {
367 .name = "ti_am3359-tscadc",
368 .pm = TSCADC_PM_OPS,
369 .of_match_table = ti_tscadc_dt_ids,
370 },
371 .probe = ti_tscadc_probe,
372 .remove = ti_tscadc_remove,
373
374};
375
376module_platform_driver(ti_tscadc_driver);
377
378MODULE_DESCRIPTION("TI touchscreen / ADC MFD controller driver");
379MODULE_AUTHOR("Rachna Patil <rachna@ti.com>");
380MODULE_LICENSE("GPL");
381
