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tcp: Fix race in tcp_poll
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mfd / t7l66xb.c
blob0a255c1f1ce7b60a3633b487ecaa18797eda43aa
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 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");
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