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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / mfd / t7l66xb.c
blob26d9176fca91968b3b450c698bc0dd1e1fca3d8d
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 .start = 0x800,
44 .end = 0x9ff,
45 .flags = IORESOURCE_MEM,
46 },
47 {
48 .start = IRQ_T7L66XB_MMC,
49 .end = IRQ_T7L66XB_MMC,
50 .flags = IORESOURCE_IRQ,
51 },
52 };
53
54 #define SCR_REVID 0x08 /* b Revision ID */
55 #define SCR_IMR 0x42 /* b Interrupt Mask */
56 #define SCR_DEV_CTL 0xe0 /* b Device control */
57 #define SCR_ISR 0xe1 /* b Interrupt Status */
58 #define SCR_GPO_OC 0xf0 /* b GPO output control */
59 #define SCR_GPO_OS 0xf1 /* b GPO output enable */
60 #define SCR_GPI_S 0xf2 /* w GPI status */
61 #define SCR_APDC 0xf8 /* b Active pullup down ctrl */
62
63 #define SCR_DEV_CTL_USB BIT(0) /* USB enable */
64 #define SCR_DEV_CTL_MMC BIT(1) /* MMC enable */
65
66 /*--------------------------------------------------------------------------*/
67
68 struct t7l66xb {
69 void __iomem *scr;
70 /* Lock to protect registers requiring read/modify/write ops. */
71 spinlock_t lock;
72
73 struct resource rscr;
74 struct clk *clk48m;
75 struct clk *clk32k;
76 int irq;
77 int irq_base;
78 };
79
80 /*--------------------------------------------------------------------------*/
81
82 static int t7l66xb_mmc_enable(struct platform_device *mmc)
83 {
84 struct platform_device *dev = to_platform_device(mmc->dev.parent);
85 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
86 unsigned long flags;
87 u8 dev_ctl;
88
89 clk_enable(t7l66xb->clk32k);
90
91 spin_lock_irqsave(&t7l66xb->lock, flags);
92
93 dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
94 dev_ctl |= SCR_DEV_CTL_MMC;
95 tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
96
97 spin_unlock_irqrestore(&t7l66xb->lock, flags);
98
99 tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
100 t7l66xb_mmc_resources[0].start & 0xfffe);
101
102 return 0;
103 }
104
105 static int t7l66xb_mmc_disable(struct platform_device *mmc)
106 {
107 struct platform_device *dev = to_platform_device(mmc->dev.parent);
108 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
109 unsigned long flags;
110 u8 dev_ctl;
111
112 spin_lock_irqsave(&t7l66xb->lock, flags);
113
114 dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
115 dev_ctl &= ~SCR_DEV_CTL_MMC;
116 tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
117
118 spin_unlock_irqrestore(&t7l66xb->lock, flags);
119
120 clk_disable(t7l66xb->clk32k);
121
122 return 0;
123 }
124
125 static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
126 {
127 struct platform_device *dev = to_platform_device(mmc->dev.parent);
128 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
129
130 tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
131 }
132
133 static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
134 {
135 struct platform_device *dev = to_platform_device(mmc->dev.parent);
136 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
137
138 tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
139 }
140
141 /*--------------------------------------------------------------------------*/
142
143 static struct tmio_mmc_data t7166xb_mmc_data = {
144 .hclk = 24000000,
145 .set_pwr = t7l66xb_mmc_pwr,
146 .set_clk_div = t7l66xb_mmc_clk_div,
147 };
148
149 static const struct resource t7l66xb_nand_resources[] = {
150 {
151 .start = 0xc00,
152 .end = 0xc07,
153 .flags = IORESOURCE_MEM,
154 },
155 {
156 .start = 0x0100,
157 .end = 0x01ff,
158 .flags = IORESOURCE_MEM,
159 },
160 {
161 .start = IRQ_T7L66XB_NAND,
162 .end = IRQ_T7L66XB_NAND,
163 .flags = IORESOURCE_IRQ,
164 },
165 };
166
167 static struct mfd_cell t7l66xb_cells[] = {
168 [T7L66XB_CELL_MMC] = {
169 .name = "tmio-mmc",
170 .enable = t7l66xb_mmc_enable,
171 .disable = t7l66xb_mmc_disable,
172 .driver_data = &t7166xb_mmc_data,
173 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
174 .resources = t7l66xb_mmc_resources,
175 },
176 [T7L66XB_CELL_NAND] = {
177 .name = "tmio-nand",
178 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
179 .resources = t7l66xb_nand_resources,
180 },
181 };
182
183 /*--------------------------------------------------------------------------*/
184
185 /* Handle the T7L66XB interrupt mux */
186 static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
187 {
188 struct t7l66xb *t7l66xb = get_irq_data(irq);
189 unsigned int isr;
190 unsigned int i, irq_base;
191
192 irq_base = t7l66xb->irq_base;
193
194 while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
195 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
196 for (i = 0; i < T7L66XB_NR_IRQS; i++)
197 if (isr & (1 << i))
198 generic_handle_irq(irq_base + i);
199 }
200
201 static void t7l66xb_irq_mask(unsigned int irq)
202 {
203 struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
204 unsigned long flags;
205 u8 imr;
206
207 spin_lock_irqsave(&t7l66xb->lock, flags);
208 imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
209 imr |= 1 << (irq - t7l66xb->irq_base);
210 tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
211 spin_unlock_irqrestore(&t7l66xb->lock, flags);
212 }
213
214 static void t7l66xb_irq_unmask(unsigned int irq)
215 {
216 struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
217 unsigned long flags;
218 u8 imr;
219
220 spin_lock_irqsave(&t7l66xb->lock, flags);
221 imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
222 imr &= ~(1 << (irq - t7l66xb->irq_base));
223 tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
224 spin_unlock_irqrestore(&t7l66xb->lock, flags);
225 }
226
227 static struct irq_chip t7l66xb_chip = {
228 .name = "t7l66xb",
229 .ack = t7l66xb_irq_mask,
230 .mask = t7l66xb_irq_mask,
231 .unmask = t7l66xb_irq_unmask,
232 };
233
234 /*--------------------------------------------------------------------------*/
235
236 /* Install the IRQ handler */
237 static void t7l66xb_attach_irq(struct platform_device *dev)
238 {
239 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
240 unsigned int irq, irq_base;
241
242 irq_base = t7l66xb->irq_base;
243
244 for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
245 set_irq_chip(irq, &t7l66xb_chip);
246 set_irq_chip_data(irq, t7l66xb);
247 set_irq_handler(irq, handle_level_irq);
248 #ifdef CONFIG_ARM
249 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
250 #endif
251 }
252
253 set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
254 set_irq_data(t7l66xb->irq, t7l66xb);
255 set_irq_chained_handler(t7l66xb->irq, t7l66xb_irq);
256 }
257
258 static void t7l66xb_detach_irq(struct platform_device *dev)
259 {
260 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
261 unsigned int irq, irq_base;
262
263 irq_base = t7l66xb->irq_base;
264
265 set_irq_chained_handler(t7l66xb->irq, NULL);
266 set_irq_data(t7l66xb->irq, NULL);
267
268 for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
269 #ifdef CONFIG_ARM
270 set_irq_flags(irq, 0);
271 #endif
272 set_irq_chip(irq, NULL);
273 set_irq_chip_data(irq, NULL);
274 }
275 }
276
277 /*--------------------------------------------------------------------------*/
278
279 #ifdef CONFIG_PM
280 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
281 {
282 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
283 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
284
285 if (pdata && pdata->suspend)
286 pdata->suspend(dev);
287 clk_disable(t7l66xb->clk48m);
288
289 return 0;
290 }
291
292 static int t7l66xb_resume(struct platform_device *dev)
293 {
294 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
295 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
296
297 clk_enable(t7l66xb->clk48m);
298 if (pdata && pdata->resume)
299 pdata->resume(dev);
300
301 tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
302 t7l66xb_mmc_resources[0].start & 0xfffe);
303
304 return 0;
305 }
306 #else
307 #define t7l66xb_suspend NULL
308 #define t7l66xb_resume NULL
309 #endif
310
311 /*--------------------------------------------------------------------------*/
312
313 static int t7l66xb_probe(struct platform_device *dev)
314 {
315 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
316 struct t7l66xb *t7l66xb;
317 struct resource *iomem, *rscr;
318 int ret;
319
320 iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
321 if (!iomem)
322 return -EINVAL;
323
324 t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
325 if (!t7l66xb)
326 return -ENOMEM;
327
328 spin_lock_init(&t7l66xb->lock);
329
330 platform_set_drvdata(dev, t7l66xb);
331
332 ret = platform_get_irq(dev, 0);
333 if (ret >= 0)
334 t7l66xb->irq = ret;
335 else
336 goto err_noirq;
337
338 t7l66xb->irq_base = pdata->irq_base;
339
340 t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
341 if (IS_ERR(t7l66xb->clk32k)) {
342 ret = PTR_ERR(t7l66xb->clk32k);
343 goto err_clk32k_get;
344 }
345
346 t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
347 if (IS_ERR(t7l66xb->clk48m)) {
348 ret = PTR_ERR(t7l66xb->clk48m);
349 clk_put(t7l66xb->clk32k);
350 goto err_clk48m_get;
351 }
352
353 rscr = &t7l66xb->rscr;
354 rscr->name = "t7l66xb-core";
355 rscr->start = iomem->start;
356 rscr->end = iomem->start + 0xff;
357 rscr->flags = IORESOURCE_MEM;
358
359 ret = request_resource(iomem, rscr);
360 if (ret)
361 goto err_request_scr;
362
363 t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
364 if (!t7l66xb->scr) {
365 ret = -ENOMEM;
366 goto err_ioremap;
367 }
368
369 clk_enable(t7l66xb->clk48m);
370
371 if (pdata && pdata->enable)
372 pdata->enable(dev);
373
374 /* Mask all interrupts */
375 tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
376
377 printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
378 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
379 (unsigned long)iomem->start, t7l66xb->irq);
380
381 t7l66xb_attach_irq(dev);
382
383 t7l66xb_cells[T7L66XB_CELL_NAND].driver_data = pdata->nand_data;
384 t7l66xb_cells[T7L66XB_CELL_NAND].platform_data =
385 &t7l66xb_cells[T7L66XB_CELL_NAND];
386 t7l66xb_cells[T7L66XB_CELL_NAND].data_size =
387 sizeof(t7l66xb_cells[T7L66XB_CELL_NAND]);
388
389 t7l66xb_cells[T7L66XB_CELL_MMC].platform_data =
390 &t7l66xb_cells[T7L66XB_CELL_MMC];
391 t7l66xb_cells[T7L66XB_CELL_MMC].data_size =
392 sizeof(t7l66xb_cells[T7L66XB_CELL_MMC]);
393
394 ret = mfd_add_devices(&dev->dev, dev->id,
395 t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
396 iomem, t7l66xb->irq_base);
397
398 if (!ret)
399 return 0;
400
401 t7l66xb_detach_irq(dev);
402 iounmap(t7l66xb->scr);
403 err_ioremap:
404 release_resource(&t7l66xb->rscr);
405 err_request_scr:
406 clk_put(t7l66xb->clk48m);
407 err_clk48m_get:
408 clk_put(t7l66xb->clk32k);
409 err_clk32k_get:
410 err_noirq:
411 kfree(t7l66xb);
412 return ret;
413 }
414
415 static int t7l66xb_remove(struct platform_device *dev)
416 {
417 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
418 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
419 int ret;
420
421 ret = pdata->disable(dev);
422 clk_disable(t7l66xb->clk48m);
423 clk_put(t7l66xb->clk48m);
424 t7l66xb_detach_irq(dev);
425 iounmap(t7l66xb->scr);
426 release_resource(&t7l66xb->rscr);
427 mfd_remove_devices(&dev->dev);
428 platform_set_drvdata(dev, NULL);
429 kfree(t7l66xb);
430
431 return ret;
432
433 }
434
435 static struct platform_driver t7l66xb_platform_driver = {
436 .driver = {
437 .name = "t7l66xb",
438 .owner = THIS_MODULE,
439 },
440 .suspend = t7l66xb_suspend,
441 .resume = t7l66xb_resume,
442 .probe = t7l66xb_probe,
443 .remove = t7l66xb_remove,
444 };
445
446 /*--------------------------------------------------------------------------*/
447
448 static int __init t7l66xb_init(void)
449 {
450 int retval = 0;
451
452 retval = platform_driver_register(&t7l66xb_platform_driver);
453 return retval;
454 }
455
456 static void __exit t7l66xb_exit(void)
457 {
458 platform_driver_unregister(&t7l66xb_platform_driver);
459 }
460
461 module_init(t7l66xb_init);
462 module_exit(t7l66xb_exit);
463
464 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
465 MODULE_LICENSE("GPL v2");
466 MODULE_AUTHOR("Ian Molton");
467 MODULE_ALIAS("platform:t7l66xb");