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/slab.h>
30 #include <linux/irq.h>
31 #include <linux/clk.h>
32 #include <linux/platform_device.h>
33 #include <linux/mfd/core.h>
34 #include <linux/mfd/tmio.h>
35 #include <linux/mfd/t7l66xb.h>
36
37 enum {
38 T7L66XB_CELL_NAND,
39 T7L66XB_CELL_MMC,
40 };
41
42 static const struct resource t7l66xb_mmc_resources[] = {
43 {
44 .start = 0x800,
45 .end = 0x9ff,
46 .flags = IORESOURCE_MEM,
47 },
48 {
49 .start = IRQ_T7L66XB_MMC,
50 .end = IRQ_T7L66XB_MMC,
51 .flags = IORESOURCE_IRQ,
52 },
53 };
54
55 #define SCR_REVID 0x08 /* b Revision ID */
56 #define SCR_IMR 0x42 /* b Interrupt Mask */
57 #define SCR_DEV_CTL 0xe0 /* b Device control */
58 #define SCR_ISR 0xe1 /* b Interrupt Status */
59 #define SCR_GPO_OC 0xf0 /* b GPO output control */
60 #define SCR_GPO_OS 0xf1 /* b GPO output enable */
61 #define SCR_GPI_S 0xf2 /* w GPI status */
62 #define SCR_APDC 0xf8 /* b Active pullup down ctrl */
63
64 #define SCR_DEV_CTL_USB BIT(0) /* USB enable */
65 #define SCR_DEV_CTL_MMC BIT(1) /* MMC enable */
66
67 /*--------------------------------------------------------------------------*/
68
69 struct t7l66xb {
70 void __iomem *scr;
71 /* Lock to protect registers requiring read/modify/write ops. */
72 raw_spinlock_t lock;
73
74 struct resource rscr;
75 struct clk *clk48m;
76 struct clk *clk32k;
77 int irq;
78 int irq_base;
79 };
80
81 /*--------------------------------------------------------------------------*/
82
t7l66xb_mmc_enable(struct platform_device * mmc)83 static int t7l66xb_mmc_enable(struct platform_device *mmc)
84 {
85 struct platform_device *dev = to_platform_device(mmc->dev.parent);
86 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
87 unsigned long flags;
88 u8 dev_ctl;
89 int ret;
90
91 ret = clk_prepare_enable(t7l66xb->clk32k);
92 if (ret)
93 return ret;
94
95 raw_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 raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
102
103 tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
104 t7l66xb_mmc_resources[0].start & 0xfffe);
105
106 return 0;
107 }
108
t7l66xb_mmc_disable(struct platform_device * mmc)109 static int t7l66xb_mmc_disable(struct platform_device *mmc)
110 {
111 struct platform_device *dev = to_platform_device(mmc->dev.parent);
112 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
113 unsigned long flags;
114 u8 dev_ctl;
115
116 raw_spin_lock_irqsave(&t7l66xb->lock, flags);
117
118 dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
119 dev_ctl &= ~SCR_DEV_CTL_MMC;
120 tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
121
122 raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
123
124 clk_disable_unprepare(t7l66xb->clk32k);
125
126 return 0;
127 }
128
t7l66xb_mmc_pwr(struct platform_device * mmc,int state)129 static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
130 {
131 struct platform_device *dev = to_platform_device(mmc->dev.parent);
132 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
133
134 tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
135 }
136
t7l66xb_mmc_clk_div(struct platform_device * mmc,int state)137 static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
138 {
139 struct platform_device *dev = to_platform_device(mmc->dev.parent);
140 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
141
142 tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
143 }
144
145 /*--------------------------------------------------------------------------*/
146
147 static struct tmio_mmc_data t7166xb_mmc_data = {
148 .hclk = 24000000,
149 .set_pwr = t7l66xb_mmc_pwr,
150 .set_clk_div = t7l66xb_mmc_clk_div,
151 };
152
153 static const struct resource t7l66xb_nand_resources[] = {
154 {
155 .start = 0xc00,
156 .end = 0xc07,
157 .flags = IORESOURCE_MEM,
158 },
159 {
160 .start = 0x0100,
161 .end = 0x01ff,
162 .flags = IORESOURCE_MEM,
163 },
164 {
165 .start = IRQ_T7L66XB_NAND,
166 .end = IRQ_T7L66XB_NAND,
167 .flags = IORESOURCE_IRQ,
168 },
169 };
170
171 static struct mfd_cell t7l66xb_cells[] = {
172 [T7L66XB_CELL_MMC] = {
173 .name = "tmio-mmc",
174 .enable = t7l66xb_mmc_enable,
175 .disable = t7l66xb_mmc_disable,
176 .platform_data = &t7166xb_mmc_data,
177 .pdata_size = sizeof(t7166xb_mmc_data),
178 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
179 .resources = t7l66xb_mmc_resources,
180 },
181 [T7L66XB_CELL_NAND] = {
182 .name = "tmio-nand",
183 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
184 .resources = t7l66xb_nand_resources,
185 },
186 };
187
188 /*--------------------------------------------------------------------------*/
189
190 /* Handle the T7L66XB interrupt mux */
t7l66xb_irq(struct irq_desc * desc)191 static void t7l66xb_irq(struct irq_desc *desc)
192 {
193 struct t7l66xb *t7l66xb = irq_desc_get_handler_data(desc);
194 unsigned int isr;
195 unsigned int i, irq_base;
196
197 irq_base = t7l66xb->irq_base;
198
199 while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
200 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
201 for (i = 0; i < T7L66XB_NR_IRQS; i++)
202 if (isr & (1 << i))
203 generic_handle_irq(irq_base + i);
204 }
205
t7l66xb_irq_mask(struct irq_data * data)206 static void t7l66xb_irq_mask(struct irq_data *data)
207 {
208 struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
209 unsigned long flags;
210 u8 imr;
211
212 raw_spin_lock_irqsave(&t7l66xb->lock, flags);
213 imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
214 imr |= 1 << (data->irq - t7l66xb->irq_base);
215 tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
216 raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
217 }
218
t7l66xb_irq_unmask(struct irq_data * data)219 static void t7l66xb_irq_unmask(struct irq_data *data)
220 {
221 struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
222 unsigned long flags;
223 u8 imr;
224
225 raw_spin_lock_irqsave(&t7l66xb->lock, flags);
226 imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
227 imr &= ~(1 << (data->irq - t7l66xb->irq_base));
228 tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
229 raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
230 }
231
232 static struct irq_chip t7l66xb_chip = {
233 .name = "t7l66xb",
234 .irq_ack = t7l66xb_irq_mask,
235 .irq_mask = t7l66xb_irq_mask,
236 .irq_unmask = t7l66xb_irq_unmask,
237 };
238
239 /*--------------------------------------------------------------------------*/
240
241 /* Install the IRQ handler */
t7l66xb_attach_irq(struct platform_device * dev)242 static void t7l66xb_attach_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 for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
250 irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
251 irq_set_chip_data(irq, t7l66xb);
252 }
253
254 irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
255 irq_set_chained_handler_and_data(t7l66xb->irq, t7l66xb_irq, t7l66xb);
256 }
257
t7l66xb_detach_irq(struct platform_device * dev)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 irq_set_chained_handler_and_data(t7l66xb->irq, NULL, NULL);
266
267 for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
268 irq_set_chip(irq, NULL);
269 irq_set_chip_data(irq, NULL);
270 }
271 }
272
273 /*--------------------------------------------------------------------------*/
274
275 #ifdef CONFIG_PM
t7l66xb_suspend(struct platform_device * dev,pm_message_t state)276 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
277 {
278 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
279 struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
280
281 if (pdata && pdata->suspend)
282 pdata->suspend(dev);
283 clk_disable_unprepare(t7l66xb->clk48m);
284
285 return 0;
286 }
287
t7l66xb_resume(struct platform_device * dev)288 static int t7l66xb_resume(struct platform_device *dev)
289 {
290 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
291 struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
292 int ret;
293
294 ret = clk_prepare_enable(t7l66xb->clk48m);
295 if (ret)
296 return ret;
297
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
t7l66xb_probe(struct platform_device * dev)313 static int t7l66xb_probe(struct platform_device *dev)
314 {
315 struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
316 struct t7l66xb *t7l66xb;
317 struct resource *iomem, *rscr;
318 int ret;
319
320 if (!pdata)
321 return -EINVAL;
322
323 iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
324 if (!iomem)
325 return -EINVAL;
326
327 t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
328 if (!t7l66xb)
329 return -ENOMEM;
330
331 raw_spin_lock_init(&t7l66xb->lock);
332
333 platform_set_drvdata(dev, t7l66xb);
334
335 ret = platform_get_irq(dev, 0);
336 if (ret >= 0)
337 t7l66xb->irq = ret;
338 else
339 goto err_noirq;
340
341 t7l66xb->irq_base = pdata->irq_base;
342
343 t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
344 if (IS_ERR(t7l66xb->clk32k)) {
345 ret = PTR_ERR(t7l66xb->clk32k);
346 goto err_clk32k_get;
347 }
348
349 t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
350 if (IS_ERR(t7l66xb->clk48m)) {
351 ret = PTR_ERR(t7l66xb->clk48m);
352 goto err_clk48m_get;
353 }
354
355 rscr = &t7l66xb->rscr;
356 rscr->name = "t7l66xb-core";
357 rscr->start = iomem->start;
358 rscr->end = iomem->start + 0xff;
359 rscr->flags = IORESOURCE_MEM;
360
361 ret = request_resource(iomem, rscr);
362 if (ret)
363 goto err_request_scr;
364
365 t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
366 if (!t7l66xb->scr) {
367 ret = -ENOMEM;
368 goto err_ioremap;
369 }
370
371 ret = clk_prepare_enable(t7l66xb->clk48m);
372 if (ret)
373 goto err_clk_enable;
374
375 if (pdata->enable)
376 pdata->enable(dev);
377
378 /* Mask all interrupts */
379 tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
380
381 printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
382 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
383 (unsigned long)iomem->start, t7l66xb->irq);
384
385 t7l66xb_attach_irq(dev);
386
387 t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
388 t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);
389
390 ret = mfd_add_devices(&dev->dev, dev->id,
391 t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
392 iomem, t7l66xb->irq_base, NULL);
393
394 if (!ret)
395 return 0;
396
397 t7l66xb_detach_irq(dev);
398 clk_disable_unprepare(t7l66xb->clk48m);
399 err_clk_enable:
400 iounmap(t7l66xb->scr);
401 err_ioremap:
402 release_resource(&t7l66xb->rscr);
403 err_request_scr:
404 clk_put(t7l66xb->clk48m);
405 err_clk48m_get:
406 clk_put(t7l66xb->clk32k);
407 err_clk32k_get:
408 err_noirq:
409 kfree(t7l66xb);
410 return ret;
411 }
412
t7l66xb_remove(struct platform_device * dev)413 static int t7l66xb_remove(struct platform_device *dev)
414 {
415 struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
416 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
417 int ret;
418
419 ret = pdata->disable(dev);
420 clk_disable_unprepare(t7l66xb->clk48m);
421 clk_put(t7l66xb->clk48m);
422 clk_disable_unprepare(t7l66xb->clk32k);
423 clk_put(t7l66xb->clk32k);
424 t7l66xb_detach_irq(dev);
425 iounmap(t7l66xb->scr);
426 release_resource(&t7l66xb->rscr);
427 mfd_remove_devices(&dev->dev);
428 kfree(t7l66xb);
429
430 return ret;
431
432 }
433
434 static struct platform_driver t7l66xb_platform_driver = {
435 .driver = {
436 .name = "t7l66xb",
437 },
438 .suspend = t7l66xb_suspend,
439 .resume = t7l66xb_resume,
440 .probe = t7l66xb_probe,
441 .remove = t7l66xb_remove,
442 };
443
444 /*--------------------------------------------------------------------------*/
445
446 module_platform_driver(t7l66xb_platform_driver);
447
448 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
449 MODULE_LICENSE("GPL v2");
450 MODULE_AUTHOR("Ian Molton");
451 MODULE_ALIAS("platform:t7l66xb");
452
