?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
i915: Add support for MSI and interrupt mitigation.
[linux-2.6/sactl.git] / drivers / mfd / t7l66xb.c
blob49a0fffc02afc238813c42ecff698700184b962f
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/io.h>
28 #include <linux/irq.h>
29 #include <linux/platform_device.h>
30 #include <linux/mfd/core.h>
31 #include <linux/mfd/tmio.h>
32 #include <linux/mfd/t7l66xb.h>
33
34 enum {
35 T7L66XB_CELL_NAND,
36 T7L66XB_CELL_MMC,
37 };
38
39 #define SCR_REVID 0x08 /* b Revision ID */
40 #define SCR_IMR 0x42 /* b Interrupt Mask */
41 #define SCR_DEV_CTL 0xe0 /* b Device control */
42 #define SCR_ISR 0xe1 /* b Interrupt Status */
43 #define SCR_GPO_OC 0xf0 /* b GPO output control */
44 #define SCR_GPO_OS 0xf1 /* b GPO output enable */
45 #define SCR_GPI_S 0xf2 /* w GPI status */
46 #define SCR_APDC 0xf8 /* b Active pullup down ctrl */
47
48 #define SCR_DEV_CTL_USB BIT(0) /* USB enable */
49 #define SCR_DEV_CTL_MMC BIT(1) /* MMC enable */
50
51 /*--------------------------------------------------------------------------*/
52
53 struct t7l66xb {
54 void __iomem *scr;
55 /* Lock to protect registers requiring read/modify/write ops. */
56 spinlock_t lock;
57
58 struct resource rscr;
59 int irq;
60 int irq_base;
61 };
62
63 /*--------------------------------------------------------------------------*/
64
65 static int t7l66xb_mmc_enable(struct platform_device *mmc)
66 {
67 struct platform_device *dev = to_platform_device(mmc->dev.parent);
68 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
69 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
70 unsigned long flags;
71 u8 dev_ctl;
72
73 if (pdata->enable_clk32k)
74 pdata->enable_clk32k(dev);
75
76 spin_lock_irqsave(&t7l66xb->lock, flags);
77
78 dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
79 dev_ctl |= SCR_DEV_CTL_MMC;
80 tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
81
82 spin_unlock_irqrestore(&t7l66xb->lock, flags);
83
84 return 0;
85 }
86
87 static int t7l66xb_mmc_disable(struct platform_device *mmc)
88 {
89 struct platform_device *dev = to_platform_device(mmc->dev.parent);
90 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
91 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
92 unsigned long flags;
93 u8 dev_ctl;
94
95 spin_lock_irqsave(&t7l66xb->lock, flags);
96
97 dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
98 dev_ctl &= ~SCR_DEV_CTL_MMC;
99 tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
100
101 spin_unlock_irqrestore(&t7l66xb->lock, flags);
102
103 if (pdata->disable_clk32k)
104 pdata->disable_clk32k(dev);
105
106 return 0;
107 }
108
109 /*--------------------------------------------------------------------------*/
110
111 const static 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 const static 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_platform_data *pdata = dev->dev.platform_data;
262
263 if (pdata && pdata->suspend)
264 pdata->suspend(dev);
265
266 return 0;
267 }
268
269 static int t7l66xb_resume(struct platform_device *dev)
270 {
271 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
272
273 if (pdata && pdata->resume)
274 pdata->resume(dev);
275
276 return 0;
277 }
278 #else
279 #define t7l66xb_suspend NULL
280 #define t7l66xb_resume NULL
281 #endif
282
283 /*--------------------------------------------------------------------------*/
284
285 static int t7l66xb_probe(struct platform_device *dev)
286 {
287 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
288 struct t7l66xb *t7l66xb;
289 struct resource *iomem, *rscr;
290 int ret;
291
292 iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
293 if (!iomem)
294 return -EINVAL;
295
296 t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
297 if (!t7l66xb)
298 return -ENOMEM;
299
300 spin_lock_init(&t7l66xb->lock);
301
302 platform_set_drvdata(dev, t7l66xb);
303
304 ret = platform_get_irq(dev, 0);
305 if (ret >= 0)
306 t7l66xb->irq = ret;
307 else
308 goto err_noirq;
309
310 t7l66xb->irq_base = pdata->irq_base;
311
312 rscr = &t7l66xb->rscr;
313 rscr->name = "t7l66xb-core";
314 rscr->start = iomem->start;
315 rscr->end = iomem->start + 0xff;
316 rscr->flags = IORESOURCE_MEM;
317
318 ret = request_resource(iomem, rscr);
319 if (ret)
320 goto err_request_scr;
321
322 t7l66xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
323 if (!t7l66xb->scr) {
324 ret = -ENOMEM;
325 goto err_ioremap;
326 }
327
328 if (pdata && pdata->enable)
329 pdata->enable(dev);
330
331 /* Mask all interrupts */
332 tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
333
334 printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
335 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
336 (unsigned long)iomem->start, t7l66xb->irq);
337
338 t7l66xb_attach_irq(dev);
339
340 t7l66xb_cells[T7L66XB_CELL_NAND].driver_data = pdata->nand_data;
341 t7l66xb_cells[T7L66XB_CELL_NAND].platform_data =
342 &t7l66xb_cells[T7L66XB_CELL_NAND];
343 t7l66xb_cells[T7L66XB_CELL_NAND].data_size =
344 sizeof(t7l66xb_cells[T7L66XB_CELL_NAND]);
345
346 t7l66xb_cells[T7L66XB_CELL_MMC].platform_data =
347 &t7l66xb_cells[T7L66XB_CELL_MMC];
348 t7l66xb_cells[T7L66XB_CELL_MMC].data_size =
349 sizeof(t7l66xb_cells[T7L66XB_CELL_MMC]);
350
351 ret = mfd_add_devices(&dev->dev, dev->id,
352 t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
353 iomem, t7l66xb->irq_base);
354
355 if (!ret)
356 return 0;
357
358 t7l66xb_detach_irq(dev);
359 iounmap(t7l66xb->scr);
360 err_ioremap:
361 release_resource(&t7l66xb->rscr);
362 err_noirq:
363 err_request_scr:
364 kfree(t7l66xb);
365 return ret;
366 }
367
368 static int t7l66xb_remove(struct platform_device *dev)
369 {
370 struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
371 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
372 int ret;
373
374 ret = pdata->disable(dev);
375
376 t7l66xb_detach_irq(dev);
377 iounmap(t7l66xb->scr);
378 release_resource(&t7l66xb->rscr);
379 mfd_remove_devices(&dev->dev);
380 platform_set_drvdata(dev, NULL);
381 kfree(t7l66xb);
382
383 return ret;
384
385 }
386
387 static struct platform_driver t7l66xb_platform_driver = {
388 .driver = {
389 .name = "t7l66xb",
390 .owner = THIS_MODULE,
391 },
392 .suspend = t7l66xb_suspend,
393 .resume = t7l66xb_resume,
394 .probe = t7l66xb_probe,
395 .remove = t7l66xb_remove,
396 };
397
398 /*--------------------------------------------------------------------------*/
399
400 static int __init t7l66xb_init(void)
401 {
402 int retval = 0;
403
404 retval = platform_driver_register(&t7l66xb_platform_driver);
405 return retval;
406 }
407
408 static void __exit t7l66xb_exit(void)
409 {
410 platform_driver_unregister(&t7l66xb_platform_driver);
411 }
412
413 module_init(t7l66xb_init);
414 module_exit(t7l66xb_exit);
415
416 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
417 MODULE_LICENSE("GPL v2");
418 MODULE_AUTHOR("Ian Molton");
419 MODULE_ALIAS("platform:t7l66xb");
SocketAccessConTroL development