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1/*
2 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
3 * JZ4740 SoC ADC driver
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * You should have received a copy of the GNU General Public License along
11 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * 675 Mass Ave, Cambridge, MA 02139, USA.
13 *
14 * This driver synchronizes access to the JZ4740 ADC core between the
15 * JZ4740 battery and hwmon drivers.
16 */
17
18#include <linux/err.h>
19#include <linux/irq.h>
20#include <linux/interrupt.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/platform_device.h>
24#include <linux/slab.h>
25#include <linux/spinlock.h>
26
27#include <linux/clk.h>
28#include <linux/mfd/core.h>
29
30#include <linux/jz4740-adc.h>
31
32
33#define JZ_REG_ADC_ENABLE 0x00
34#define JZ_REG_ADC_CFG 0x04
35#define JZ_REG_ADC_CTRL 0x08
36#define JZ_REG_ADC_STATUS 0x0c
37
38#define JZ_REG_ADC_TOUCHSCREEN_BASE 0x10
39#define JZ_REG_ADC_BATTERY_BASE 0x1c
40#define JZ_REG_ADC_HWMON_BASE 0x20
41
42#define JZ_ADC_ENABLE_TOUCH BIT(2)
43#define JZ_ADC_ENABLE_BATTERY BIT(1)
44#define JZ_ADC_ENABLE_ADCIN BIT(0)
45
46enum {
47 JZ_ADC_IRQ_ADCIN = 0,
48 JZ_ADC_IRQ_BATTERY,
49 JZ_ADC_IRQ_TOUCH,
50 JZ_ADC_IRQ_PENUP,
51 JZ_ADC_IRQ_PENDOWN,
52};
53
54struct jz4740_adc {
55 struct resource *mem;
56 void __iomem *base;
57
58 int irq;
59 struct irq_chip_generic *gc;
60
61 struct clk *clk;
62 atomic_t clk_ref;
63
64 spinlock_t lock;
65};
66
67static void jz4740_adc_irq_demux(unsigned int irq, struct irq_desc *desc)
68{
69 struct irq_chip_generic *gc = irq_desc_get_handler_data(desc);
70 uint8_t status;
71 unsigned int i;
72
73 status = readb(gc->reg_base + JZ_REG_ADC_STATUS);
74
75 for (i = 0; i < 5; ++i) {
76 if (status & BIT(i))
77 generic_handle_irq(gc->irq_base + i);
78 }
79}
80
81
82/* Refcounting for the ADC clock is done in here instead of in the clock
83 * framework, because it is the only clock which is shared between multiple
84 * devices and thus is the only clock which needs refcounting */
85static inline void jz4740_adc_clk_enable(struct jz4740_adc *adc)
86{
87 if (atomic_inc_return(&adc->clk_ref) == 1)
88 clk_enable(adc->clk);
89}
90
91static inline void jz4740_adc_clk_disable(struct jz4740_adc *adc)
92{
93 if (atomic_dec_return(&adc->clk_ref) == 0)
94 clk_disable(adc->clk);
95}
96
97static inline void jz4740_adc_set_enabled(struct jz4740_adc *adc, int engine,
98 bool enabled)
99{
100 unsigned long flags;
101 uint8_t val;
102
103 spin_lock_irqsave(&adc->lock, flags);
104
105 val = readb(adc->base + JZ_REG_ADC_ENABLE);
106 if (enabled)
107 val |= BIT(engine);
108 else
109 val &= ~BIT(engine);
110 writeb(val, adc->base + JZ_REG_ADC_ENABLE);
111
112 spin_unlock_irqrestore(&adc->lock, flags);
113}
114
115static int jz4740_adc_cell_enable(struct platform_device *pdev)
116{
117 struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);
118
119 jz4740_adc_clk_enable(adc);
120 jz4740_adc_set_enabled(adc, pdev->id, true);
121
122 return 0;
123}
124
125static int jz4740_adc_cell_disable(struct platform_device *pdev)
126{
127 struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);
128
129 jz4740_adc_set_enabled(adc, pdev->id, false);
130 jz4740_adc_clk_disable(adc);
131
132 return 0;
133}
134
135int jz4740_adc_set_config(struct device *dev, uint32_t mask, uint32_t val)
136{
137 struct jz4740_adc *adc = dev_get_drvdata(dev);
138 unsigned long flags;
139 uint32_t cfg;
140
141 if (!adc)
142 return -ENODEV;
143
144 spin_lock_irqsave(&adc->lock, flags);
145
146 cfg = readl(adc->base + JZ_REG_ADC_CFG);
147
148 cfg &= ~mask;
149 cfg |= val;
150
151 writel(cfg, adc->base + JZ_REG_ADC_CFG);
152
153 spin_unlock_irqrestore(&adc->lock, flags);
154
155 return 0;
156}
157EXPORT_SYMBOL_GPL(jz4740_adc_set_config);
158
159static struct resource jz4740_hwmon_resources[] = {
160 {
161 .start = JZ_ADC_IRQ_ADCIN,
162 .flags = IORESOURCE_IRQ,
163 },
164 {
165 .start = JZ_REG_ADC_HWMON_BASE,
166 .end = JZ_REG_ADC_HWMON_BASE + 3,
167 .flags = IORESOURCE_MEM,
168 },
169};
170
171static struct resource jz4740_battery_resources[] = {
172 {
173 .start = JZ_ADC_IRQ_BATTERY,
174 .flags = IORESOURCE_IRQ,
175 },
176 {
177 .start = JZ_REG_ADC_BATTERY_BASE,
178 .end = JZ_REG_ADC_BATTERY_BASE + 3,
179 .flags = IORESOURCE_MEM,
180 },
181};
182
183const struct mfd_cell jz4740_adc_cells[] = {
184 {
185 .id = 0,
186 .name = "jz4740-hwmon",
187 .num_resources = ARRAY_SIZE(jz4740_hwmon_resources),
188 .resources = jz4740_hwmon_resources,
189
190 .enable = jz4740_adc_cell_enable,
191 .disable = jz4740_adc_cell_disable,
192 },
193 {
194 .id = 1,
195 .name = "jz4740-battery",
196 .num_resources = ARRAY_SIZE(jz4740_battery_resources),
197 .resources = jz4740_battery_resources,
198
199 .enable = jz4740_adc_cell_enable,
200 .disable = jz4740_adc_cell_disable,
201 },
202};
203
204static int __devinit jz4740_adc_probe(struct platform_device *pdev)
205{
206 struct irq_chip_generic *gc;
207 struct irq_chip_type *ct;
208 struct jz4740_adc *adc;
209 struct resource *mem_base;
210 int ret;
211 int irq_base;
212
213 adc = kmalloc(sizeof(*adc), GFP_KERNEL);
214 if (!adc) {
215 dev_err(&pdev->dev, "Failed to allocate driver structure\n");
216 return -ENOMEM;
217 }
218
219 adc->irq = platform_get_irq(pdev, 0);
220 if (adc->irq < 0) {
221 ret = adc->irq;
222 dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
223 goto err_free;
224 }
225
226 irq_base = platform_get_irq(pdev, 1);
227 if (irq_base < 0) {
228 ret = irq_base;
229 dev_err(&pdev->dev, "Failed to get irq base: %d\n", ret);
230 goto err_free;
231 }
232
233 mem_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
234 if (!mem_base) {
235 ret = -ENOENT;
236 dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
237 goto err_free;
238 }
239
240 /* Only request the shared registers for the MFD driver */
241 adc->mem = request_mem_region(mem_base->start, JZ_REG_ADC_STATUS,
242 pdev->name);
243 if (!adc->mem) {
244 ret = -EBUSY;
245 dev_err(&pdev->dev, "Failed to request mmio memory region\n");
246 goto err_free;
247 }
248
249 adc->base = ioremap_nocache(adc->mem->start, resource_size(adc->mem));
250 if (!adc->base) {
251 ret = -EBUSY;
252 dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
253 goto err_release_mem_region;
254 }
255
256 adc->clk = clk_get(&pdev->dev, "adc");
257 if (IS_ERR(adc->clk)) {
258 ret = PTR_ERR(adc->clk);
259 dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
260 goto err_iounmap;
261 }
262
263 spin_lock_init(&adc->lock);
264 atomic_set(&adc->clk_ref, 0);
265
266 platform_set_drvdata(pdev, adc);
267
268 gc = irq_alloc_generic_chip("INTC", 1, irq_base, adc->base,
269 handle_level_irq);
270
271 ct = gc->chip_types;
272 ct->regs.mask = JZ_REG_ADC_CTRL;
273 ct->regs.ack = JZ_REG_ADC_STATUS;
274 ct->chip.irq_mask = irq_gc_mask_set_bit;
275 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
276 ct->chip.irq_ack = irq_gc_ack_set_bit;
277
278 irq_setup_generic_chip(gc, IRQ_MSK(5), 0, 0, IRQ_NOPROBE | IRQ_LEVEL);
279
280 adc->gc = gc;
281
282 irq_set_handler_data(adc->irq, gc);
283 irq_set_chained_handler(adc->irq, jz4740_adc_irq_demux);
284
285 writeb(0x00, adc->base + JZ_REG_ADC_ENABLE);
286 writeb(0xff, adc->base + JZ_REG_ADC_CTRL);
287
288 ret = mfd_add_devices(&pdev->dev, 0, jz4740_adc_cells,
289 ARRAY_SIZE(jz4740_adc_cells), mem_base, irq_base);
290 if (ret < 0)
291 goto err_clk_put;
292
293 return 0;
294
295err_clk_put:
296 clk_put(adc->clk);
297err_iounmap:
298 platform_set_drvdata(pdev, NULL);
299 iounmap(adc->base);
300err_release_mem_region:
301 release_mem_region(adc->mem->start, resource_size(adc->mem));
302err_free:
303 kfree(adc);
304
305 return ret;
306}
307
308static int __devexit jz4740_adc_remove(struct platform_device *pdev)
309{
310 struct jz4740_adc *adc = platform_get_drvdata(pdev);
311
312 mfd_remove_devices(&pdev->dev);
313
314 irq_remove_generic_chip(adc->gc, IRQ_MSK(5), IRQ_NOPROBE | IRQ_LEVEL, 0);
315 kfree(adc->gc);
316 irq_set_handler_data(adc->irq, NULL);
317 irq_set_chained_handler(adc->irq, NULL);
318
319 iounmap(adc->base);
320 release_mem_region(adc->mem->start, resource_size(adc->mem));
321
322 clk_put(adc->clk);
323
324 platform_set_drvdata(pdev, NULL);
325
326 kfree(adc);
327
328 return 0;
329}
330
331struct platform_driver jz4740_adc_driver = {
332 .probe = jz4740_adc_probe,
333 .remove = __devexit_p(jz4740_adc_remove),
334 .driver = {
335 .name = "jz4740-adc",
336 .owner = THIS_MODULE,
337 },
338};
339
340static int __init jz4740_adc_init(void)
341{
342 return platform_driver_register(&jz4740_adc_driver);
343}
344module_init(jz4740_adc_init);
345
346static void __exit jz4740_adc_exit(void)
347{
348 platform_driver_unregister(&jz4740_adc_driver);
349}
350module_exit(jz4740_adc_exit);
351
352MODULE_DESCRIPTION("JZ4740 SoC ADC driver");
353MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
354MODULE_LICENSE("GPL");
355MODULE_ALIAS("platform:jz4740-adc");
1/*
2 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
3 * JZ4740 SoC ADC driver
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * You should have received a copy of the GNU General Public License along
11 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * 675 Mass Ave, Cambridge, MA 02139, USA.
13 *
14 * This driver synchronizes access to the JZ4740 ADC core between the
15 * JZ4740 battery and hwmon drivers.
16 */
17
18#include <linux/err.h>
19#include <linux/io.h>
20#include <linux/irq.h>
21#include <linux/interrupt.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/platform_device.h>
25#include <linux/slab.h>
26#include <linux/spinlock.h>
27
28#include <linux/clk.h>
29#include <linux/mfd/core.h>
30
31#include <linux/jz4740-adc.h>
32
33
34#define JZ_REG_ADC_ENABLE 0x00
35#define JZ_REG_ADC_CFG 0x04
36#define JZ_REG_ADC_CTRL 0x08
37#define JZ_REG_ADC_STATUS 0x0c
38
39#define JZ_REG_ADC_TOUCHSCREEN_BASE 0x10
40#define JZ_REG_ADC_BATTERY_BASE 0x1c
41#define JZ_REG_ADC_HWMON_BASE 0x20
42
43#define JZ_ADC_ENABLE_TOUCH BIT(2)
44#define JZ_ADC_ENABLE_BATTERY BIT(1)
45#define JZ_ADC_ENABLE_ADCIN BIT(0)
46
47enum {
48 JZ_ADC_IRQ_ADCIN = 0,
49 JZ_ADC_IRQ_BATTERY,
50 JZ_ADC_IRQ_TOUCH,
51 JZ_ADC_IRQ_PENUP,
52 JZ_ADC_IRQ_PENDOWN,
53};
54
55struct jz4740_adc {
56 struct resource *mem;
57 void __iomem *base;
58
59 int irq;
60 struct irq_chip_generic *gc;
61
62 struct clk *clk;
63 atomic_t clk_ref;
64
65 spinlock_t lock;
66};
67
68static void jz4740_adc_irq_demux(struct irq_desc *desc)
69{
70 struct irq_chip_generic *gc = irq_desc_get_handler_data(desc);
71 uint8_t status;
72 unsigned int i;
73
74 status = readb(gc->reg_base + JZ_REG_ADC_STATUS);
75
76 for (i = 0; i < 5; ++i) {
77 if (status & BIT(i))
78 generic_handle_irq(gc->irq_base + i);
79 }
80}
81
82
83/* Refcounting for the ADC clock is done in here instead of in the clock
84 * framework, because it is the only clock which is shared between multiple
85 * devices and thus is the only clock which needs refcounting */
86static inline void jz4740_adc_clk_enable(struct jz4740_adc *adc)
87{
88 if (atomic_inc_return(&adc->clk_ref) == 1)
89 clk_prepare_enable(adc->clk);
90}
91
92static inline void jz4740_adc_clk_disable(struct jz4740_adc *adc)
93{
94 if (atomic_dec_return(&adc->clk_ref) == 0)
95 clk_disable_unprepare(adc->clk);
96}
97
98static inline void jz4740_adc_set_enabled(struct jz4740_adc *adc, int engine,
99 bool enabled)
100{
101 unsigned long flags;
102 uint8_t val;
103
104 spin_lock_irqsave(&adc->lock, flags);
105
106 val = readb(adc->base + JZ_REG_ADC_ENABLE);
107 if (enabled)
108 val |= BIT(engine);
109 else
110 val &= ~BIT(engine);
111 writeb(val, adc->base + JZ_REG_ADC_ENABLE);
112
113 spin_unlock_irqrestore(&adc->lock, flags);
114}
115
116static int jz4740_adc_cell_enable(struct platform_device *pdev)
117{
118 struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);
119
120 jz4740_adc_clk_enable(adc);
121 jz4740_adc_set_enabled(adc, pdev->id, true);
122
123 return 0;
124}
125
126static int jz4740_adc_cell_disable(struct platform_device *pdev)
127{
128 struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);
129
130 jz4740_adc_set_enabled(adc, pdev->id, false);
131 jz4740_adc_clk_disable(adc);
132
133 return 0;
134}
135
136int jz4740_adc_set_config(struct device *dev, uint32_t mask, uint32_t val)
137{
138 struct jz4740_adc *adc = dev_get_drvdata(dev);
139 unsigned long flags;
140 uint32_t cfg;
141
142 if (!adc)
143 return -ENODEV;
144
145 spin_lock_irqsave(&adc->lock, flags);
146
147 cfg = readl(adc->base + JZ_REG_ADC_CFG);
148
149 cfg &= ~mask;
150 cfg |= val;
151
152 writel(cfg, adc->base + JZ_REG_ADC_CFG);
153
154 spin_unlock_irqrestore(&adc->lock, flags);
155
156 return 0;
157}
158EXPORT_SYMBOL_GPL(jz4740_adc_set_config);
159
160static struct resource jz4740_hwmon_resources[] = {
161 {
162 .start = JZ_ADC_IRQ_ADCIN,
163 .flags = IORESOURCE_IRQ,
164 },
165 {
166 .start = JZ_REG_ADC_HWMON_BASE,
167 .end = JZ_REG_ADC_HWMON_BASE + 3,
168 .flags = IORESOURCE_MEM,
169 },
170};
171
172static struct resource jz4740_battery_resources[] = {
173 {
174 .start = JZ_ADC_IRQ_BATTERY,
175 .flags = IORESOURCE_IRQ,
176 },
177 {
178 .start = JZ_REG_ADC_BATTERY_BASE,
179 .end = JZ_REG_ADC_BATTERY_BASE + 3,
180 .flags = IORESOURCE_MEM,
181 },
182};
183
184static const struct mfd_cell jz4740_adc_cells[] = {
185 {
186 .id = 0,
187 .name = "jz4740-hwmon",
188 .num_resources = ARRAY_SIZE(jz4740_hwmon_resources),
189 .resources = jz4740_hwmon_resources,
190
191 .enable = jz4740_adc_cell_enable,
192 .disable = jz4740_adc_cell_disable,
193 },
194 {
195 .id = 1,
196 .name = "jz4740-battery",
197 .num_resources = ARRAY_SIZE(jz4740_battery_resources),
198 .resources = jz4740_battery_resources,
199
200 .enable = jz4740_adc_cell_enable,
201 .disable = jz4740_adc_cell_disable,
202 },
203};
204
205static int jz4740_adc_probe(struct platform_device *pdev)
206{
207 struct irq_chip_generic *gc;
208 struct irq_chip_type *ct;
209 struct jz4740_adc *adc;
210 struct resource *mem_base;
211 int ret;
212 int irq_base;
213
214 adc = devm_kzalloc(&pdev->dev, sizeof(*adc), GFP_KERNEL);
215 if (!adc) {
216 dev_err(&pdev->dev, "Failed to allocate driver structure\n");
217 return -ENOMEM;
218 }
219
220 adc->irq = platform_get_irq(pdev, 0);
221 if (adc->irq < 0) {
222 ret = adc->irq;
223 dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
224 return ret;
225 }
226
227 irq_base = platform_get_irq(pdev, 1);
228 if (irq_base < 0) {
229 dev_err(&pdev->dev, "Failed to get irq base: %d\n", irq_base);
230 return irq_base;
231 }
232
233 mem_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
234 if (!mem_base) {
235 dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
236 return -ENOENT;
237 }
238
239 /* Only request the shared registers for the MFD driver */
240 adc->mem = request_mem_region(mem_base->start, JZ_REG_ADC_STATUS,
241 pdev->name);
242 if (!adc->mem) {
243 dev_err(&pdev->dev, "Failed to request mmio memory region\n");
244 return -EBUSY;
245 }
246
247 adc->base = ioremap_nocache(adc->mem->start, resource_size(adc->mem));
248 if (!adc->base) {
249 ret = -EBUSY;
250 dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
251 goto err_release_mem_region;
252 }
253
254 adc->clk = clk_get(&pdev->dev, "adc");
255 if (IS_ERR(adc->clk)) {
256 ret = PTR_ERR(adc->clk);
257 dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
258 goto err_iounmap;
259 }
260
261 spin_lock_init(&adc->lock);
262 atomic_set(&adc->clk_ref, 0);
263
264 platform_set_drvdata(pdev, adc);
265
266 gc = irq_alloc_generic_chip("INTC", 1, irq_base, adc->base,
267 handle_level_irq);
268
269 ct = gc->chip_types;
270 ct->regs.mask = JZ_REG_ADC_CTRL;
271 ct->regs.ack = JZ_REG_ADC_STATUS;
272 ct->chip.irq_mask = irq_gc_mask_set_bit;
273 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
274 ct->chip.irq_ack = irq_gc_ack_set_bit;
275
276 irq_setup_generic_chip(gc, IRQ_MSK(5), IRQ_GC_INIT_MASK_CACHE, 0,
277 IRQ_NOPROBE | IRQ_LEVEL);
278
279 adc->gc = gc;
280
281 irq_set_chained_handler_and_data(adc->irq, jz4740_adc_irq_demux, gc);
282
283 writeb(0x00, adc->base + JZ_REG_ADC_ENABLE);
284 writeb(0xff, adc->base + JZ_REG_ADC_CTRL);
285
286 ret = mfd_add_devices(&pdev->dev, 0, jz4740_adc_cells,
287 ARRAY_SIZE(jz4740_adc_cells), mem_base,
288 irq_base, NULL);
289 if (ret < 0)
290 goto err_clk_put;
291
292 return 0;
293
294err_clk_put:
295 clk_put(adc->clk);
296err_iounmap:
297 iounmap(adc->base);
298err_release_mem_region:
299 release_mem_region(adc->mem->start, resource_size(adc->mem));
300 return ret;
301}
302
303static int jz4740_adc_remove(struct platform_device *pdev)
304{
305 struct jz4740_adc *adc = platform_get_drvdata(pdev);
306
307 mfd_remove_devices(&pdev->dev);
308
309 irq_remove_generic_chip(adc->gc, IRQ_MSK(5), IRQ_NOPROBE | IRQ_LEVEL, 0);
310 kfree(adc->gc);
311 irq_set_chained_handler_and_data(adc->irq, NULL, NULL);
312
313 iounmap(adc->base);
314 release_mem_region(adc->mem->start, resource_size(adc->mem));
315
316 clk_put(adc->clk);
317
318 return 0;
319}
320
321static struct platform_driver jz4740_adc_driver = {
322 .probe = jz4740_adc_probe,
323 .remove = jz4740_adc_remove,
324 .driver = {
325 .name = "jz4740-adc",
326 },
327};
328
329module_platform_driver(jz4740_adc_driver);
330
331MODULE_DESCRIPTION("JZ4740 SoC ADC driver");
332MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
333MODULE_LICENSE("GPL");
334MODULE_ALIAS("platform:jz4740-adc");