MFD,mmc: tmio_mmc: make HCLK configurable
[linux-2.6.git] / drivers / mfd / t7l66xb.c
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 #define SCR_REVID       0x08            /* b Revision ID        */
42 #define SCR_IMR         0x42            /* b Interrupt Mask     */
43 #define SCR_DEV_CTL     0xe0            /* b Device control     */
44 #define SCR_ISR         0xe1            /* b Interrupt Status   */
45 #define SCR_GPO_OC      0xf0            /* b GPO output control */
46 #define SCR_GPO_OS      0xf1            /* b GPO output enable  */
47 #define SCR_GPI_S       0xf2            /* w GPI status         */
48 #define SCR_APDC        0xf8            /* b Active pullup down ctrl */
49
50 #define SCR_DEV_CTL_USB         BIT(0)  /* USB enable           */
51 #define SCR_DEV_CTL_MMC         BIT(1)  /* MMC enable           */
52
53 /*--------------------------------------------------------------------------*/
54
55 struct t7l66xb {
56         void __iomem            *scr;
57         /* Lock to protect registers requiring read/modify/write ops. */
58         spinlock_t              lock;
59
60         struct resource         rscr;
61         struct clk              *clk48m;
62         struct clk              *clk32k;
63         int                     irq;
64         int                     irq_base;
65 };
66
67 /*--------------------------------------------------------------------------*/
68
69 static int t7l66xb_mmc_enable(struct platform_device *mmc)
70 {
71         struct platform_device *dev = to_platform_device(mmc->dev.parent);
72         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
73         unsigned long flags;
74         u8 dev_ctl;
75
76         clk_enable(t7l66xb->clk32k);
77
78         spin_lock_irqsave(&t7l66xb->lock, flags);
79
80         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
81         dev_ctl |= SCR_DEV_CTL_MMC;
82         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
83
84         spin_unlock_irqrestore(&t7l66xb->lock, flags);
85
86         return 0;
87 }
88
89 static int t7l66xb_mmc_disable(struct platform_device *mmc)
90 {
91         struct platform_device *dev = to_platform_device(mmc->dev.parent);
92         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
93         unsigned long flags;
94         u8 dev_ctl;
95
96         spin_lock_irqsave(&t7l66xb->lock, flags);
97
98         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
99         dev_ctl &= ~SCR_DEV_CTL_MMC;
100         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
101
102         spin_unlock_irqrestore(&t7l66xb->lock, flags);
103
104         clk_disable(t7l66xb->clk32k);
105
106         return 0;
107 }
108
109 /*--------------------------------------------------------------------------*/
110
111 static const struct tmio_mmc_data t7166xb_mmc_data = {
112         .hclk = 24000000,
113 };
114
115 static const struct resource t7l66xb_mmc_resources[] = {
116         {
117                 .start = 0x800,
118                 .end    = 0x9ff,
119                 .flags = IORESOURCE_MEM,
120         },
121         {
122                 .start = 0x200,
123                 .end    = 0x2ff,
124                 .flags = IORESOURCE_MEM,
125         },
126         {
127                 .start = IRQ_T7L66XB_MMC,
128                 .end    = IRQ_T7L66XB_MMC,
129                 .flags = IORESOURCE_IRQ,
130         },
131 };
132
133 static const struct resource t7l66xb_nand_resources[] = {
134         {
135                 .start  = 0xc00,
136                 .end    = 0xc07,
137                 .flags  = IORESOURCE_MEM,
138         },
139         {
140                 .start  = 0x0100,
141                 .end    = 0x01ff,
142                 .flags  = IORESOURCE_MEM,
143         },
144         {
145                 .start  = IRQ_T7L66XB_NAND,
146                 .end    = IRQ_T7L66XB_NAND,
147                 .flags  = IORESOURCE_IRQ,
148         },
149 };
150
151 static struct mfd_cell t7l66xb_cells[] = {
152         [T7L66XB_CELL_MMC] = {
153                 .name = "tmio-mmc",
154                 .enable = t7l66xb_mmc_enable,
155                 .disable = t7l66xb_mmc_disable,
156                 .driver_data = &t7166xb_mmc_data,
157                 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
158                 .resources = t7l66xb_mmc_resources,
159         },
160         [T7L66XB_CELL_NAND] = {
161                 .name = "tmio-nand",
162                 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
163                 .resources = t7l66xb_nand_resources,
164         },
165 };
166
167 /*--------------------------------------------------------------------------*/
168
169 /* Handle the T7L66XB interrupt mux */
170 static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
171 {
172         struct t7l66xb *t7l66xb = get_irq_data(irq);
173         unsigned int isr;
174         unsigned int i, irq_base;
175
176         irq_base = t7l66xb->irq_base;
177
178         while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
179                                 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
180                 for (i = 0; i < T7L66XB_NR_IRQS; i++)
181                         if (isr & (1 << i))
182                                 generic_handle_irq(irq_base + i);
183 }
184
185 static void t7l66xb_irq_mask(unsigned int irq)
186 {
187         struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
188         unsigned long                   flags;
189         u8 imr;
190
191         spin_lock_irqsave(&t7l66xb->lock, flags);
192         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
193         imr |= 1 << (irq - t7l66xb->irq_base);
194         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
195         spin_unlock_irqrestore(&t7l66xb->lock, flags);
196 }
197
198 static void t7l66xb_irq_unmask(unsigned int irq)
199 {
200         struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
201         unsigned long flags;
202         u8 imr;
203
204         spin_lock_irqsave(&t7l66xb->lock, flags);
205         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
206         imr &= ~(1 << (irq - t7l66xb->irq_base));
207         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
208         spin_unlock_irqrestore(&t7l66xb->lock, flags);
209 }
210
211 static struct irq_chip t7l66xb_chip = {
212         .name   = "t7l66xb",
213         .ack    = t7l66xb_irq_mask,
214         .mask   = t7l66xb_irq_mask,
215         .unmask = t7l66xb_irq_unmask,
216 };
217
218 /*--------------------------------------------------------------------------*/
219
220 /* Install the IRQ handler */
221 static void t7l66xb_attach_irq(struct platform_device *dev)
222 {
223         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
224         unsigned int irq, irq_base;
225
226         irq_base = t7l66xb->irq_base;
227
228         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
229                 set_irq_chip(irq, &t7l66xb_chip);
230                 set_irq_chip_data(irq, t7l66xb);
231                 set_irq_handler(irq, handle_level_irq);
232 #ifdef CONFIG_ARM
233                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
234 #endif
235         }
236
237         set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
238         set_irq_data(t7l66xb->irq, t7l66xb);
239         set_irq_chained_handler(t7l66xb->irq, t7l66xb_irq);
240 }
241
242 static void t7l66xb_detach_irq(struct platform_device *dev)
243 {
244         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
245         unsigned int irq, irq_base;
246
247         irq_base = t7l66xb->irq_base;
248
249         set_irq_chained_handler(t7l66xb->irq, NULL);
250         set_irq_data(t7l66xb->irq, NULL);
251
252         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
253 #ifdef CONFIG_ARM
254                 set_irq_flags(irq, 0);
255 #endif
256                 set_irq_chip(irq, NULL);
257                 set_irq_chip_data(irq, NULL);
258         }
259 }
260
261 /*--------------------------------------------------------------------------*/
262
263 #ifdef CONFIG_PM
264 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
265 {
266         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
267         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
268
269         if (pdata && pdata->suspend)
270                 pdata->suspend(dev);
271         clk_disable(t7l66xb->clk48m);
272
273         return 0;
274 }
275
276 static int t7l66xb_resume(struct platform_device *dev)
277 {
278         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
279         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
280
281         clk_enable(t7l66xb->clk48m);
282         if (pdata && pdata->resume)
283                 pdata->resume(dev);
284
285         return 0;
286 }
287 #else
288 #define t7l66xb_suspend NULL
289 #define t7l66xb_resume  NULL
290 #endif
291
292 /*--------------------------------------------------------------------------*/
293
294 static int t7l66xb_probe(struct platform_device *dev)
295 {
296         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
297         struct t7l66xb *t7l66xb;
298         struct resource *iomem, *rscr;
299         int ret;
300
301         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
302         if (!iomem)
303                 return -EINVAL;
304
305         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
306         if (!t7l66xb)
307                 return -ENOMEM;
308
309         spin_lock_init(&t7l66xb->lock);
310
311         platform_set_drvdata(dev, t7l66xb);
312
313         ret = platform_get_irq(dev, 0);
314         if (ret >= 0)
315                 t7l66xb->irq = ret;
316         else
317                 goto err_noirq;
318
319         t7l66xb->irq_base = pdata->irq_base;
320
321         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
322         if (IS_ERR(t7l66xb->clk32k)) {
323                 ret = PTR_ERR(t7l66xb->clk32k);
324                 goto err_clk32k_get;
325         }
326
327         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
328         if (IS_ERR(t7l66xb->clk48m)) {
329                 ret = PTR_ERR(t7l66xb->clk48m);
330                 clk_put(t7l66xb->clk32k);
331                 goto err_clk48m_get;
332         }
333
334         rscr = &t7l66xb->rscr;
335         rscr->name = "t7l66xb-core";
336         rscr->start = iomem->start;
337         rscr->end = iomem->start + 0xff;
338         rscr->flags = IORESOURCE_MEM;
339
340         ret = request_resource(iomem, rscr);
341         if (ret)
342                 goto err_request_scr;
343
344         t7l66xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
345         if (!t7l66xb->scr) {
346                 ret = -ENOMEM;
347                 goto err_ioremap;
348         }
349
350         clk_enable(t7l66xb->clk48m);
351
352         if (pdata && pdata->enable)
353                 pdata->enable(dev);
354
355         /* Mask all interrupts */
356         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
357
358         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
359                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
360                 (unsigned long)iomem->start, t7l66xb->irq);
361
362         t7l66xb_attach_irq(dev);
363
364         t7l66xb_cells[T7L66XB_CELL_NAND].driver_data = pdata->nand_data;
365         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data =
366                 &t7l66xb_cells[T7L66XB_CELL_NAND];
367         t7l66xb_cells[T7L66XB_CELL_NAND].data_size =
368                 sizeof(t7l66xb_cells[T7L66XB_CELL_NAND]);
369
370         t7l66xb_cells[T7L66XB_CELL_MMC].platform_data =
371                 &t7l66xb_cells[T7L66XB_CELL_MMC];
372         t7l66xb_cells[T7L66XB_CELL_MMC].data_size =
373                 sizeof(t7l66xb_cells[T7L66XB_CELL_MMC]);
374
375         ret = mfd_add_devices(&dev->dev, dev->id,
376                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
377                               iomem, t7l66xb->irq_base);
378
379         if (!ret)
380                 return 0;
381
382         t7l66xb_detach_irq(dev);
383         iounmap(t7l66xb->scr);
384 err_ioremap:
385         release_resource(&t7l66xb->rscr);
386 err_request_scr:
387         kfree(t7l66xb);
388         clk_put(t7l66xb->clk48m);
389 err_clk48m_get:
390         clk_put(t7l66xb->clk32k);
391 err_clk32k_get:
392 err_noirq:
393         return ret;
394 }
395
396 static int t7l66xb_remove(struct platform_device *dev)
397 {
398         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
399         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
400         int ret;
401
402         ret = pdata->disable(dev);
403         clk_disable(t7l66xb->clk48m);
404         clk_put(t7l66xb->clk48m);
405         t7l66xb_detach_irq(dev);
406         iounmap(t7l66xb->scr);
407         release_resource(&t7l66xb->rscr);
408         mfd_remove_devices(&dev->dev);
409         platform_set_drvdata(dev, NULL);
410         kfree(t7l66xb);
411
412         return ret;
413
414 }
415
416 static struct platform_driver t7l66xb_platform_driver = {
417         .driver = {
418                 .name   = "t7l66xb",
419                 .owner  = THIS_MODULE,
420         },
421         .suspend        = t7l66xb_suspend,
422         .resume         = t7l66xb_resume,
423         .probe          = t7l66xb_probe,
424         .remove         = t7l66xb_remove,
425 };
426
427 /*--------------------------------------------------------------------------*/
428
429 static int __init t7l66xb_init(void)
430 {
431         int retval = 0;
432
433         retval = platform_driver_register(&t7l66xb_platform_driver);
434         return retval;
435 }
436
437 static void __exit t7l66xb_exit(void)
438 {
439         platform_driver_unregister(&t7l66xb_platform_driver);
440 }
441
442 module_init(t7l66xb_init);
443 module_exit(t7l66xb_exit);
444
445 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
446 MODULE_LICENSE("GPL v2");
447 MODULE_AUTHOR("Ian Molton");
448 MODULE_ALIAS("platform:t7l66xb");