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mm-only debug patch...
[mmotm.git] / drivers / mfd / t7l66xb.c
blob2fa070361f05808ae270f81b0b5a960b637b6fa0
1 /*
2 *
3 * Toshiba T7L66XB core mfd support
4 *
5 * Copyright (c) 2005, 2007, 2008 Ian Molton
6 * Copyright (c) 2008 Dmitry Baryshkov
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * T7L66 features:
13 *
14 * Supported in this driver:
15 * SD/MMC
16 * SM/NAND flash controller
17 *
18 * As yet not supported
19 * GPIO interface (on NAND pins)
20 * Serial interface
21 * TFT 'interface converter'
22 * PCMCIA interface logic
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/err.h>
28 #include <linux/io.h>
29 #include <linux/irq.h>
30 #include <linux/clk.h>
31 #include <linux/platform_device.h>
32 #include <linux/mfd/core.h>
33 #include <linux/mfd/tmio.h>
34 #include <linux/mfd/t7l66xb.h>
35
36 enum {
37 T7L66XB_CELL_NAND,
38 T7L66XB_CELL_MMC,
39 };
40
41 static const struct resource t7l66xb_mmc_resources[];
42
43 #define SCR_REVID 0x08 /* b Revision ID */
44 #define SCR_IMR 0x42 /* b Interrupt Mask */
45 #define SCR_DEV_CTL 0xe0 /* b Device control */
46 #define SCR_ISR 0xe1 /* b Interrupt Status */
47 #define SCR_GPO_OC 0xf0 /* b GPO output control */
48 #define SCR_GPO_OS 0xf1 /* b GPO output enable */
49 #define SCR_GPI_S 0xf2 /* w GPI status */
50 #define SCR_APDC 0xf8 /* b Active pullup down ctrl */
51
52 #define SCR_DEV_CTL_USB BIT(0) /* USB enable */
53 #define SCR_DEV_CTL_MMC BIT(1) /* MMC enable */
54
55 /*--------------------------------------------------------------------------*/
56
57 struct t7l66xb {
58 void __iomem *scr;
59 /* Lock to protect registers requiring read/modify/write ops. */
60 spinlock_t lock;
61
62 struct resource rscr;
63 struct clk *clk48m;
64 struct clk *clk32k;
65 int irq;
66 int irq_base;
67 };
68
69 /*--------------------------------------------------------------------------*/
70
71 static int t7l66xb_mmc_enable(struct platform_device *mmc)
72 {
73 struct platform_device *dev = to_platform_device(mmc->dev.parent);
74 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
75 unsigned long flags;
76 u8 dev_ctl;
77
78 clk_enable(t7l66xb->clk32k);
79
80 spin_lock_irqsave(&t7l66xb->lock, flags);
81
82 dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
83 dev_ctl |= SCR_DEV_CTL_MMC;
84 tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
85
86 spin_unlock_irqrestore(&t7l66xb->lock, flags);
87
88 tmio_core_mmc_enable(t7l66xb->scr + 0x200,
89 t7l66xb_mmc_resources[0].start & 0xfffe);
90
91 return 0;
92 }
93
94 static int t7l66xb_mmc_disable(struct platform_device *mmc)
95 {
96 struct platform_device *dev = to_platform_device(mmc->dev.parent);
97 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
98 unsigned long flags;
99 u8 dev_ctl;
100
101 spin_lock_irqsave(&t7l66xb->lock, flags);
102
103 dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
104 dev_ctl &= ~SCR_DEV_CTL_MMC;
105 tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
106
107 spin_unlock_irqrestore(&t7l66xb->lock, flags);
108
109 clk_disable(t7l66xb->clk32k);
110
111 return 0;
112 }
113
114 static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
115 {
116 struct platform_device *dev = to_platform_device(mmc->dev.parent);
117 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
118
119 tmio_core_mmc_pwr(t7l66xb->scr + 0x200, state);
120 }
121
122 static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
123 {
124 struct platform_device *dev = to_platform_device(mmc->dev.parent);
125 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
126
127 tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, state);
128 }
129
130 /*--------------------------------------------------------------------------*/
131
132 static struct tmio_mmc_data t7166xb_mmc_data = {
133 .hclk = 24000000,
134 .set_pwr = t7l66xb_mmc_pwr,
135 .set_no_clk_div = t7l66xb_mmc_clk_div,
136 };
137
138 static const struct resource t7l66xb_mmc_resources[] = {
139 {
140 .start = 0x800,
141 .end = 0x9ff,
142 .flags = IORESOURCE_MEM,
143 },
144 {
145 .start = IRQ_T7L66XB_MMC,
146 .end = IRQ_T7L66XB_MMC,
147 .flags = IORESOURCE_IRQ,
148 },
149 };
150
151 static const struct resource t7l66xb_nand_resources[] = {
152 {
153 .start = 0xc00,
154 .end = 0xc07,
155 .flags = IORESOURCE_MEM,
156 },
157 {
158 .start = 0x0100,
159 .end = 0x01ff,
160 .flags = IORESOURCE_MEM,
161 },
162 {
163 .start = IRQ_T7L66XB_NAND,
164 .end = IRQ_T7L66XB_NAND,
165 .flags = IORESOURCE_IRQ,
166 },
167 };
168
169 static struct mfd_cell t7l66xb_cells[] = {
170 [T7L66XB_CELL_MMC] = {
171 .name = "tmio-mmc",
172 .enable = t7l66xb_mmc_enable,
173 .disable = t7l66xb_mmc_disable,
174 .driver_data = &t7166xb_mmc_data,
175 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
176 .resources = t7l66xb_mmc_resources,
177 },
178 [T7L66XB_CELL_NAND] = {
179 .name = "tmio-nand",
180 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
181 .resources = t7l66xb_nand_resources,
182 },
183 };
184
185 /*--------------------------------------------------------------------------*/
186
187 /* Handle the T7L66XB interrupt mux */
188 static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
189 {
190 struct t7l66xb *t7l66xb = get_irq_data(irq);
191 unsigned int isr;
192 unsigned int i, irq_base;
193
194 irq_base = t7l66xb->irq_base;
195
196 while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
197 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
198 for (i = 0; i < T7L66XB_NR_IRQS; i++)
199 if (isr & (1 << i))
200 generic_handle_irq(irq_base + i);
201 }
202
203 static void t7l66xb_irq_mask(unsigned int irq)
204 {
205 struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
206 unsigned long flags;
207 u8 imr;
208
209 spin_lock_irqsave(&t7l66xb->lock, flags);
210 imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
211 imr |= 1 << (irq - t7l66xb->irq_base);
212 tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
213 spin_unlock_irqrestore(&t7l66xb->lock, flags);
214 }
215
216 static void t7l66xb_irq_unmask(unsigned int irq)
217 {
218 struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
219 unsigned long flags;
220 u8 imr;
221
222 spin_lock_irqsave(&t7l66xb->lock, flags);
223 imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
224 imr &= ~(1 << (irq - t7l66xb->irq_base));
225 tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
226 spin_unlock_irqrestore(&t7l66xb->lock, flags);
227 }
228
229 static struct irq_chip t7l66xb_chip = {
230 .name = "t7l66xb",
231 .ack = t7l66xb_irq_mask,
232 .mask = t7l66xb_irq_mask,
233 .unmask = t7l66xb_irq_unmask,
234 };
235
236 /*--------------------------------------------------------------------------*/
237
238 /* Install the IRQ handler */
239 static void t7l66xb_attach_irq(struct platform_device *dev)
240 {
241 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
242 unsigned int irq, irq_base;
243
244 irq_base = t7l66xb->irq_base;
245
246 for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
247 set_irq_chip(irq, &t7l66xb_chip);
248 set_irq_chip_data(irq, t7l66xb);
249 set_irq_handler(irq, handle_level_irq);
250 #ifdef CONFIG_ARM
251 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
252 #endif
253 }
254
255 set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
256 set_irq_data(t7l66xb->irq, t7l66xb);
257 set_irq_chained_handler(t7l66xb->irq, t7l66xb_irq);
258 }
259
260 static void t7l66xb_detach_irq(struct platform_device *dev)
261 {
262 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
263 unsigned int irq, irq_base;
264
265 irq_base = t7l66xb->irq_base;
266
267 set_irq_chained_handler(t7l66xb->irq, NULL);
268 set_irq_data(t7l66xb->irq, NULL);
269
270 for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
271 #ifdef CONFIG_ARM
272 set_irq_flags(irq, 0);
273 #endif
274 set_irq_chip(irq, NULL);
275 set_irq_chip_data(irq, NULL);
276 }
277 }
278
279 /*--------------------------------------------------------------------------*/
280
281 #ifdef CONFIG_PM
282 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
283 {
284 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
285 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
286
287 if (pdata && pdata->suspend)
288 pdata->suspend(dev);
289 clk_disable(t7l66xb->clk48m);
290
291 return 0;
292 }
293
294 static int t7l66xb_resume(struct platform_device *dev)
295 {
296 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
297 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
298
299 clk_enable(t7l66xb->clk48m);
300 if (pdata && pdata->resume)
301 pdata->resume(dev);
302
303 tmio_core_mmc_enable(t7l66xb->scr + 0x200,
304 t7l66xb_mmc_resources[0].start & 0xfffe);
305
306 return 0;
307 }
308 #else
309 #define t7l66xb_suspend NULL
310 #define t7l66xb_resume NULL
311 #endif
312
313 /*--------------------------------------------------------------------------*/
314
315 static int t7l66xb_probe(struct platform_device *dev)
316 {
317 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
318 struct t7l66xb *t7l66xb;
319 struct resource *iomem, *rscr;
320 int ret;
321
322 iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
323 if (!iomem)
324 return -EINVAL;
325
326 t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
327 if (!t7l66xb)
328 return -ENOMEM;
329
330 spin_lock_init(&t7l66xb->lock);
331
332 platform_set_drvdata(dev, t7l66xb);
333
334 ret = platform_get_irq(dev, 0);
335 if (ret >= 0)
336 t7l66xb->irq = ret;
337 else
338 goto err_noirq;
339
340 t7l66xb->irq_base = pdata->irq_base;
341
342 t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
343 if (IS_ERR(t7l66xb->clk32k)) {
344 ret = PTR_ERR(t7l66xb->clk32k);
345 goto err_clk32k_get;
346 }
347
348 t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
349 if (IS_ERR(t7l66xb->clk48m)) {
350 ret = PTR_ERR(t7l66xb->clk48m);
351 clk_put(t7l66xb->clk32k);
352 goto err_clk48m_get;
353 }
354
355 rscr = &t7l66xb->rscr;
356 rscr->name = "t7l66xb-core";
357 rscr->start = iomem->start;
358 rscr->end = iomem->start + 0xff;
359 rscr->flags = IORESOURCE_MEM;
360
361 ret = request_resource(iomem, rscr);
362 if (ret)
363 goto err_request_scr;
364
365 t7l66xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
366 if (!t7l66xb->scr) {
367 ret = -ENOMEM;
368 goto err_ioremap;
369 }
370
371 clk_enable(t7l66xb->clk48m);
372
373 if (pdata && pdata->enable)
374 pdata->enable(dev);
375
376 /* Mask all interrupts */
377 tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
378
379 printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
380 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
381 (unsigned long)iomem->start, t7l66xb->irq);
382
383 t7l66xb_attach_irq(dev);
384
385 t7l66xb_cells[T7L66XB_CELL_NAND].driver_data = pdata->nand_data;
386 t7l66xb_cells[T7L66XB_CELL_NAND].platform_data =
387 &t7l66xb_cells[T7L66XB_CELL_NAND];
388 t7l66xb_cells[T7L66XB_CELL_NAND].data_size =
389 sizeof(t7l66xb_cells[T7L66XB_CELL_NAND]);
390
391 t7l66xb_cells[T7L66XB_CELL_MMC].platform_data =
392 &t7l66xb_cells[T7L66XB_CELL_MMC];
393 t7l66xb_cells[T7L66XB_CELL_MMC].data_size =
394 sizeof(t7l66xb_cells[T7L66XB_CELL_MMC]);
395
396 ret = mfd_add_devices(&dev->dev, dev->id,
397 t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
398 iomem, t7l66xb->irq_base);
399
400 if (!ret)
401 return 0;
402
403 t7l66xb_detach_irq(dev);
404 iounmap(t7l66xb->scr);
405 err_ioremap:
406 release_resource(&t7l66xb->rscr);
407 err_request_scr:
408 kfree(t7l66xb);
409 clk_put(t7l66xb->clk48m);
410 err_clk48m_get:
411 clk_put(t7l66xb->clk32k);
412 err_clk32k_get:
413 err_noirq:
414 return ret;
415 }
416
417 static int t7l66xb_remove(struct platform_device *dev)
418 {
419 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
420 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
421 int ret;
422
423 ret = pdata->disable(dev);
424 clk_disable(t7l66xb->clk48m);
425 clk_put(t7l66xb->clk48m);
426 t7l66xb_detach_irq(dev);
427 iounmap(t7l66xb->scr);
428 release_resource(&t7l66xb->rscr);
429 mfd_remove_devices(&dev->dev);
430 platform_set_drvdata(dev, NULL);
431 kfree(t7l66xb);
432
433 return ret;
434
435 }
436
437 static struct platform_driver t7l66xb_platform_driver = {
438 .driver = {
439 .name = "t7l66xb",
440 .owner = THIS_MODULE,
441 },
442 .suspend = t7l66xb_suspend,
443 .resume = t7l66xb_resume,
444 .probe = t7l66xb_probe,
445 .remove = t7l66xb_remove,
446 };
447
448 /*--------------------------------------------------------------------------*/
449
450 static int __init t7l66xb_init(void)
451 {
452 int retval = 0;
453
454 retval = platform_driver_register(&t7l66xb_platform_driver);
455 return retval;
456 }
457
458 static void __exit t7l66xb_exit(void)
459 {
460 platform_driver_unregister(&t7l66xb_platform_driver);
461 }
462
463 module_init(t7l66xb_init);
464 module_exit(t7l66xb_exit);
465
466 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
467 MODULE_LICENSE("GPL v2");
468 MODULE_AUTHOR("Ian Molton");
469 MODULE_ALIAS("platform:t7l66xb");
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