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Linux/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/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         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 
 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 
 90         clk_enable(t7l66xb->clk32k);
 91 
 92         spin_lock_irqsave(&t7l66xb->lock, flags);
 93 
 94         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
 95         dev_ctl |= SCR_DEV_CTL_MMC;
 96         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
 97 
 98         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 99 
100         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
101                 t7l66xb_mmc_resources[0].start & 0xfffe);
102 
103         return 0;
104 }
105 
106 static int t7l66xb_mmc_disable(struct platform_device *mmc)
107 {
108         struct platform_device *dev = to_platform_device(mmc->dev.parent);
109         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
110         unsigned long flags;
111         u8 dev_ctl;
112 
113         spin_lock_irqsave(&t7l66xb->lock, flags);
114 
115         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
116         dev_ctl &= ~SCR_DEV_CTL_MMC;
117         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
118 
119         spin_unlock_irqrestore(&t7l66xb->lock, flags);
120 
121         clk_disable(t7l66xb->clk32k);
122 
123         return 0;
124 }
125 
126 static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
127 {
128         struct platform_device *dev = to_platform_device(mmc->dev.parent);
129         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
130 
131         tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
132 }
133 
134 static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
135 {
136         struct platform_device *dev = to_platform_device(mmc->dev.parent);
137         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
138 
139         tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
140 }
141 
142 /*--------------------------------------------------------------------------*/
143 
144 static struct tmio_mmc_data t7166xb_mmc_data = {
145         .hclk = 24000000,
146         .set_pwr = t7l66xb_mmc_pwr,
147         .set_clk_div = t7l66xb_mmc_clk_div,
148 };
149 
150 static const struct resource t7l66xb_nand_resources[] = {
151         {
152                 .start  = 0xc00,
153                 .end    = 0xc07,
154                 .flags  = IORESOURCE_MEM,
155         },
156         {
157                 .start  = 0x0100,
158                 .end    = 0x01ff,
159                 .flags  = IORESOURCE_MEM,
160         },
161         {
162                 .start  = IRQ_T7L66XB_NAND,
163                 .end    = IRQ_T7L66XB_NAND,
164                 .flags  = IORESOURCE_IRQ,
165         },
166 };
167 
168 static struct mfd_cell t7l66xb_cells[] = {
169         [T7L66XB_CELL_MMC] = {
170                 .name = "tmio-mmc",
171                 .enable = t7l66xb_mmc_enable,
172                 .disable = t7l66xb_mmc_disable,
173                 .platform_data = &t7166xb_mmc_data,
174                 .pdata_size    = sizeof(t7166xb_mmc_data),
175                 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
176                 .resources = t7l66xb_mmc_resources,
177         },
178         [T7L66XB_CELL_NAND] = {
179                 .name = "tmio-nand",
180                 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
181                 .resources = t7l66xb_nand_resources,
182         },
183 };
184 
185 /*--------------------------------------------------------------------------*/
186 
187 /* Handle the T7L66XB interrupt mux */
188 static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
189 {
190         struct t7l66xb *t7l66xb = irq_get_handler_data(irq);
191         unsigned int isr;
192         unsigned int i, irq_base;
193 
194         irq_base = t7l66xb->irq_base;
195 
196         while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
197                                 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
198                 for (i = 0; i < T7L66XB_NR_IRQS; i++)
199                         if (isr & (1 << i))
200                                 generic_handle_irq(irq_base + i);
201 }
202 
203 static void t7l66xb_irq_mask(struct irq_data *data)
204 {
205         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
206         unsigned long                   flags;
207         u8 imr;
208 
209         spin_lock_irqsave(&t7l66xb->lock, flags);
210         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
211         imr |= 1 << (data->irq - t7l66xb->irq_base);
212         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
213         spin_unlock_irqrestore(&t7l66xb->lock, flags);
214 }
215 
216 static void t7l66xb_irq_unmask(struct irq_data *data)
217 {
218         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
219         unsigned long flags;
220         u8 imr;
221 
222         spin_lock_irqsave(&t7l66xb->lock, flags);
223         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
224         imr &= ~(1 << (data->irq - t7l66xb->irq_base));
225         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
226         spin_unlock_irqrestore(&t7l66xb->lock, flags);
227 }
228 
229 static struct irq_chip t7l66xb_chip = {
230         .name           = "t7l66xb",
231         .irq_ack        = t7l66xb_irq_mask,
232         .irq_mask       = t7l66xb_irq_mask,
233         .irq_unmask     = t7l66xb_irq_unmask,
234 };
235 
236 /*--------------------------------------------------------------------------*/
237 
238 /* Install the IRQ handler */
239 static void t7l66xb_attach_irq(struct platform_device *dev)
240 {
241         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
242         unsigned int irq, irq_base;
243 
244         irq_base = t7l66xb->irq_base;
245 
246         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
247                 irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
248                 irq_set_chip_data(irq, t7l66xb);
249 #ifdef CONFIG_ARM
250                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
251 #endif
252         }
253 
254         irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
255         irq_set_handler_data(t7l66xb->irq, t7l66xb);
256         irq_set_chained_handler(t7l66xb->irq, t7l66xb_irq);
257 }
258 
259 static void t7l66xb_detach_irq(struct platform_device *dev)
260 {
261         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
262         unsigned int irq, irq_base;
263 
264         irq_base = t7l66xb->irq_base;
265 
266         irq_set_chained_handler(t7l66xb->irq, NULL);
267         irq_set_handler_data(t7l66xb->irq, NULL);
268 
269         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
270 #ifdef CONFIG_ARM
271                 set_irq_flags(irq, 0);
272 #endif
273                 irq_set_chip(irq, NULL);
274                 irq_set_chip_data(irq, NULL);
275         }
276 }
277 
278 /*--------------------------------------------------------------------------*/
279 
280 #ifdef CONFIG_PM
281 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
282 {
283         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
284         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
285 
286         if (pdata && pdata->suspend)
287                 pdata->suspend(dev);
288         clk_disable(t7l66xb->clk48m);
289 
290         return 0;
291 }
292 
293 static int t7l66xb_resume(struct platform_device *dev)
294 {
295         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
296         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
297 
298         clk_enable(t7l66xb->clk48m);
299         if (pdata && pdata->resume)
300                 pdata->resume(dev);
301 
302         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
303                 t7l66xb_mmc_resources[0].start & 0xfffe);
304 
305         return 0;
306 }
307 #else
308 #define t7l66xb_suspend NULL
309 #define t7l66xb_resume  NULL
310 #endif
311 
312 /*--------------------------------------------------------------------------*/
313 
314 static int t7l66xb_probe(struct platform_device *dev)
315 {
316         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
317         struct t7l66xb *t7l66xb;
318         struct resource *iomem, *rscr;
319         int ret;
320 
321         if (pdata == NULL)
322                 return -EINVAL;
323 
324         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
325         if (!iomem)
326                 return -EINVAL;
327 
328         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
329         if (!t7l66xb)
330                 return -ENOMEM;
331 
332         spin_lock_init(&t7l66xb->lock);
333 
334         platform_set_drvdata(dev, t7l66xb);
335 
336         ret = platform_get_irq(dev, 0);
337         if (ret >= 0)
338                 t7l66xb->irq = ret;
339         else
340                 goto err_noirq;
341 
342         t7l66xb->irq_base = pdata->irq_base;
343 
344         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
345         if (IS_ERR(t7l66xb->clk32k)) {
346                 ret = PTR_ERR(t7l66xb->clk32k);
347                 goto err_clk32k_get;
348         }
349 
350         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
351         if (IS_ERR(t7l66xb->clk48m)) {
352                 ret = PTR_ERR(t7l66xb->clk48m);
353                 goto err_clk48m_get;
354         }
355 
356         rscr = &t7l66xb->rscr;
357         rscr->name = "t7l66xb-core";
358         rscr->start = iomem->start;
359         rscr->end = iomem->start + 0xff;
360         rscr->flags = IORESOURCE_MEM;
361 
362         ret = request_resource(iomem, rscr);
363         if (ret)
364                 goto err_request_scr;
365 
366         t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
367         if (!t7l66xb->scr) {
368                 ret = -ENOMEM;
369                 goto err_ioremap;
370         }
371 
372         clk_enable(t7l66xb->clk48m);
373 
374         if (pdata && pdata->enable)
375                 pdata->enable(dev);
376 
377         /* Mask all interrupts */
378         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
379 
380         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
381                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
382                 (unsigned long)iomem->start, t7l66xb->irq);
383 
384         t7l66xb_attach_irq(dev);
385 
386         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
387         t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);
388 
389         ret = mfd_add_devices(&dev->dev, dev->id,
390                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
391                               iomem, t7l66xb->irq_base, NULL);
392 
393         if (!ret)
394                 return 0;
395 
396         t7l66xb_detach_irq(dev);
397         iounmap(t7l66xb->scr);
398 err_ioremap:
399         release_resource(&t7l66xb->rscr);
400 err_request_scr:
401         clk_put(t7l66xb->clk48m);
402 err_clk48m_get:
403         clk_put(t7l66xb->clk32k);
404 err_clk32k_get:
405 err_noirq:
406         kfree(t7l66xb);
407         return ret;
408 }
409 
410 static int t7l66xb_remove(struct platform_device *dev)
411 {
412         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
413         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
414         int ret;
415 
416         ret = pdata->disable(dev);
417         clk_disable(t7l66xb->clk48m);
418         clk_put(t7l66xb->clk48m);
419         clk_disable(t7l66xb->clk32k);
420         clk_put(t7l66xb->clk32k);
421         t7l66xb_detach_irq(dev);
422         iounmap(t7l66xb->scr);
423         release_resource(&t7l66xb->rscr);
424         mfd_remove_devices(&dev->dev);
425         kfree(t7l66xb);
426 
427         return ret;
428 
429 }
430 
431 static struct platform_driver t7l66xb_platform_driver = {
432         .driver = {
433                 .name   = "t7l66xb",
434                 .owner  = THIS_MODULE,
435         },
436         .suspend        = t7l66xb_suspend,
437         .resume         = t7l66xb_resume,
438         .probe          = t7l66xb_probe,
439         .remove         = t7l66xb_remove,
440 };
441 
442 /*--------------------------------------------------------------------------*/
443 
444 module_platform_driver(t7l66xb_platform_driver);
445 
446 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
447 MODULE_LICENSE("GPL v2");
448 MODULE_AUTHOR("Ian Molton");
449 MODULE_ALIAS("platform:t7l66xb");
450 

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