e9f4323dd2cb4ea67e6263ec75059b3c5604cc85
[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 resource t7l66xb_mmc_resources[] = {
112         {
113                 .start = 0x800,
114                 .end    = 0x9ff,
115                 .flags = IORESOURCE_MEM,
116         },
117         {
118                 .start = 0x200,
119                 .end    = 0x2ff,
120                 .flags = IORESOURCE_MEM,
121         },
122         {
123                 .start = IRQ_T7L66XB_MMC,
124                 .end    = IRQ_T7L66XB_MMC,
125                 .flags = IORESOURCE_IRQ,
126         },
127 };
128
129 static const struct resource t7l66xb_nand_resources[] = {
130         {
131                 .start  = 0xc00,
132                 .end    = 0xc07,
133                 .flags  = IORESOURCE_MEM,
134         },
135         {
136                 .start  = 0x0100,
137                 .end    = 0x01ff,
138                 .flags  = IORESOURCE_MEM,
139         },
140         {
141                 .start  = IRQ_T7L66XB_NAND,
142                 .end    = IRQ_T7L66XB_NAND,
143                 .flags  = IORESOURCE_IRQ,
144         },
145 };
146
147 static struct mfd_cell t7l66xb_cells[] = {
148         [T7L66XB_CELL_MMC] = {
149                 .name = "tmio-mmc",
150                 .enable = t7l66xb_mmc_enable,
151                 .disable = t7l66xb_mmc_disable,
152                 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
153                 .resources = t7l66xb_mmc_resources,
154         },
155         [T7L66XB_CELL_NAND] = {
156                 .name = "tmio-nand",
157                 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
158                 .resources = t7l66xb_nand_resources,
159         },
160 };
161
162 /*--------------------------------------------------------------------------*/
163
164 /* Handle the T7L66XB interrupt mux */
165 static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
166 {
167         struct t7l66xb *t7l66xb = get_irq_data(irq);
168         unsigned int isr;
169         unsigned int i, irq_base;
170
171         irq_base = t7l66xb->irq_base;
172
173         while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
174                                 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
175                 for (i = 0; i < T7L66XB_NR_IRQS; i++)
176                         if (isr & (1 << i))
177                                 generic_handle_irq(irq_base + i);
178 }
179
180 static void t7l66xb_irq_mask(unsigned int irq)
181 {
182         struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
183         unsigned long                   flags;
184         u8 imr;
185
186         spin_lock_irqsave(&t7l66xb->lock, flags);
187         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
188         imr |= 1 << (irq - t7l66xb->irq_base);
189         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
190         spin_unlock_irqrestore(&t7l66xb->lock, flags);
191 }
192
193 static void t7l66xb_irq_unmask(unsigned int irq)
194 {
195         struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
196         unsigned long flags;
197         u8 imr;
198
199         spin_lock_irqsave(&t7l66xb->lock, flags);
200         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
201         imr &= ~(1 << (irq - t7l66xb->irq_base));
202         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
203         spin_unlock_irqrestore(&t7l66xb->lock, flags);
204 }
205
206 static struct irq_chip t7l66xb_chip = {
207         .name   = "t7l66xb",
208         .ack    = t7l66xb_irq_mask,
209         .mask   = t7l66xb_irq_mask,
210         .unmask = t7l66xb_irq_unmask,
211 };
212
213 /*--------------------------------------------------------------------------*/
214
215 /* Install the IRQ handler */
216 static void t7l66xb_attach_irq(struct platform_device *dev)
217 {
218         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
219         unsigned int irq, irq_base;
220
221         irq_base = t7l66xb->irq_base;
222
223         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
224                 set_irq_chip(irq, &t7l66xb_chip);
225                 set_irq_chip_data(irq, t7l66xb);
226                 set_irq_handler(irq, handle_level_irq);
227 #ifdef CONFIG_ARM
228                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
229 #endif
230         }
231
232         set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
233         set_irq_data(t7l66xb->irq, t7l66xb);
234         set_irq_chained_handler(t7l66xb->irq, t7l66xb_irq);
235 }
236
237 static void t7l66xb_detach_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         set_irq_chained_handler(t7l66xb->irq, NULL);
245         set_irq_data(t7l66xb->irq, NULL);
246
247         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
248 #ifdef CONFIG_ARM
249                 set_irq_flags(irq, 0);
250 #endif
251                 set_irq_chip(irq, NULL);
252                 set_irq_chip_data(irq, NULL);
253         }
254 }
255
256 /*--------------------------------------------------------------------------*/
257
258 #ifdef CONFIG_PM
259 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
260 {
261         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
262         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
263
264         if (pdata && pdata->suspend)
265                 pdata->suspend(dev);
266         clk_disable(t7l66xb->clk48m);
267
268         return 0;
269 }
270
271 static int t7l66xb_resume(struct platform_device *dev)
272 {
273         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
274         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
275
276         clk_enable(t7l66xb->clk48m);
277         if (pdata && pdata->resume)
278                 pdata->resume(dev);
279
280         return 0;
281 }
282 #else
283 #define t7l66xb_suspend NULL
284 #define t7l66xb_resume  NULL
285 #endif
286
287 /*--------------------------------------------------------------------------*/
288
289 static int t7l66xb_probe(struct platform_device *dev)
290 {
291         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
292         struct t7l66xb *t7l66xb;
293         struct resource *iomem, *rscr;
294         int ret;
295
296         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
297         if (!iomem)
298                 return -EINVAL;
299
300         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
301         if (!t7l66xb)
302                 return -ENOMEM;
303
304         spin_lock_init(&t7l66xb->lock);
305
306         platform_set_drvdata(dev, t7l66xb);
307
308         ret = platform_get_irq(dev, 0);
309         if (ret >= 0)
310                 t7l66xb->irq = ret;
311         else
312                 goto err_noirq;
313
314         t7l66xb->irq_base = pdata->irq_base;
315
316         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
317         if (IS_ERR(t7l66xb->clk32k)) {
318                 ret = PTR_ERR(t7l66xb->clk32k);
319                 goto err_clk32k_get;
320         }
321
322         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
323         if (IS_ERR(t7l66xb->clk48m)) {
324                 ret = PTR_ERR(t7l66xb->clk48m);
325                 clk_put(t7l66xb->clk32k);
326                 goto err_clk48m_get;
327         }
328
329         rscr = &t7l66xb->rscr;
330         rscr->name = "t7l66xb-core";
331         rscr->start = iomem->start;
332         rscr->end = iomem->start + 0xff;
333         rscr->flags = IORESOURCE_MEM;
334
335         ret = request_resource(iomem, rscr);
336         if (ret)
337                 goto err_request_scr;
338
339         t7l66xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
340         if (!t7l66xb->scr) {
341                 ret = -ENOMEM;
342                 goto err_ioremap;
343         }
344
345         clk_enable(t7l66xb->clk48m);
346
347         if (pdata && pdata->enable)
348                 pdata->enable(dev);
349
350         /* Mask all interrupts */
351         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
352
353         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
354                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
355                 (unsigned long)iomem->start, t7l66xb->irq);
356
357         t7l66xb_attach_irq(dev);
358
359         t7l66xb_cells[T7L66XB_CELL_NAND].driver_data = pdata->nand_data;
360         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data =
361                 &t7l66xb_cells[T7L66XB_CELL_NAND];
362         t7l66xb_cells[T7L66XB_CELL_NAND].data_size =
363                 sizeof(t7l66xb_cells[T7L66XB_CELL_NAND]);
364
365         t7l66xb_cells[T7L66XB_CELL_MMC].platform_data =
366                 &t7l66xb_cells[T7L66XB_CELL_MMC];
367         t7l66xb_cells[T7L66XB_CELL_MMC].data_size =
368                 sizeof(t7l66xb_cells[T7L66XB_CELL_MMC]);
369
370         ret = mfd_add_devices(&dev->dev, dev->id,
371                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
372                               iomem, t7l66xb->irq_base);
373
374         if (!ret)
375                 return 0;
376
377         t7l66xb_detach_irq(dev);
378         iounmap(t7l66xb->scr);
379 err_ioremap:
380         release_resource(&t7l66xb->rscr);
381 err_request_scr:
382         kfree(t7l66xb);
383         clk_put(t7l66xb->clk48m);
384 err_clk48m_get:
385         clk_put(t7l66xb->clk32k);
386 err_clk32k_get:
387 err_noirq:
388         return ret;
389 }
390
391 static int t7l66xb_remove(struct platform_device *dev)
392 {
393         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
394         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
395         int ret;
396
397         ret = pdata->disable(dev);
398         clk_disable(t7l66xb->clk48m);
399         clk_put(t7l66xb->clk48m);
400         t7l66xb_detach_irq(dev);
401         iounmap(t7l66xb->scr);
402         release_resource(&t7l66xb->rscr);
403         mfd_remove_devices(&dev->dev);
404         platform_set_drvdata(dev, NULL);
405         kfree(t7l66xb);
406
407         return ret;
408
409 }
410
411 static struct platform_driver t7l66xb_platform_driver = {
412         .driver = {
413                 .name   = "t7l66xb",
414                 .owner  = THIS_MODULE,
415         },
416         .suspend        = t7l66xb_suspend,
417         .resume         = t7l66xb_resume,
418         .probe          = t7l66xb_probe,
419         .remove         = t7l66xb_remove,
420 };
421
422 /*--------------------------------------------------------------------------*/
423
424 static int __init t7l66xb_init(void)
425 {
426         int retval = 0;
427
428         retval = platform_driver_register(&t7l66xb_platform_driver);
429         return retval;
430 }
431
432 static void __exit t7l66xb_exit(void)
433 {
434         platform_driver_unregister(&t7l66xb_platform_driver);
435 }
436
437 module_init(t7l66xb_init);
438 module_exit(t7l66xb_exit);
439
440 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
441 MODULE_LICENSE("GPL v2");
442 MODULE_AUTHOR("Ian Molton");
443 MODULE_ALIAS("platform:t7l66xb");