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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_prepare_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_unprepare(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(struct irq_desc *desc)
189 {
190         struct t7l66xb *t7l66xb = irq_desc_get_handler_data(desc);
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         }
250 
251         irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
252         irq_set_chained_handler_and_data(t7l66xb->irq, t7l66xb_irq, t7l66xb);
253 }
254 
255 static void t7l66xb_detach_irq(struct platform_device *dev)
256 {
257         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
258         unsigned int irq, irq_base;
259 
260         irq_base = t7l66xb->irq_base;
261 
262         irq_set_chained_handler_and_data(t7l66xb->irq, NULL, NULL);
263 
264         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
265                 irq_set_chip(irq, NULL);
266                 irq_set_chip_data(irq, NULL);
267         }
268 }
269 
270 /*--------------------------------------------------------------------------*/
271 
272 #ifdef CONFIG_PM
273 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
274 {
275         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
276         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
277 
278         if (pdata && pdata->suspend)
279                 pdata->suspend(dev);
280         clk_disable_unprepare(t7l66xb->clk48m);
281 
282         return 0;
283 }
284 
285 static int t7l66xb_resume(struct platform_device *dev)
286 {
287         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
288         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
289 
290         clk_prepare_enable(t7l66xb->clk48m);
291         if (pdata && pdata->resume)
292                 pdata->resume(dev);
293 
294         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
295                 t7l66xb_mmc_resources[0].start & 0xfffe);
296 
297         return 0;
298 }
299 #else
300 #define t7l66xb_suspend NULL
301 #define t7l66xb_resume  NULL
302 #endif
303 
304 /*--------------------------------------------------------------------------*/
305 
306 static int t7l66xb_probe(struct platform_device *dev)
307 {
308         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
309         struct t7l66xb *t7l66xb;
310         struct resource *iomem, *rscr;
311         int ret;
312 
313         if (!pdata)
314                 return -EINVAL;
315 
316         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
317         if (!iomem)
318                 return -EINVAL;
319 
320         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
321         if (!t7l66xb)
322                 return -ENOMEM;
323 
324         spin_lock_init(&t7l66xb->lock);
325 
326         platform_set_drvdata(dev, t7l66xb);
327 
328         ret = platform_get_irq(dev, 0);
329         if (ret >= 0)
330                 t7l66xb->irq = ret;
331         else
332                 goto err_noirq;
333 
334         t7l66xb->irq_base = pdata->irq_base;
335 
336         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
337         if (IS_ERR(t7l66xb->clk32k)) {
338                 ret = PTR_ERR(t7l66xb->clk32k);
339                 goto err_clk32k_get;
340         }
341 
342         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
343         if (IS_ERR(t7l66xb->clk48m)) {
344                 ret = PTR_ERR(t7l66xb->clk48m);
345                 goto err_clk48m_get;
346         }
347 
348         rscr = &t7l66xb->rscr;
349         rscr->name = "t7l66xb-core";
350         rscr->start = iomem->start;
351         rscr->end = iomem->start + 0xff;
352         rscr->flags = IORESOURCE_MEM;
353 
354         ret = request_resource(iomem, rscr);
355         if (ret)
356                 goto err_request_scr;
357 
358         t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
359         if (!t7l66xb->scr) {
360                 ret = -ENOMEM;
361                 goto err_ioremap;
362         }
363 
364         clk_prepare_enable(t7l66xb->clk48m);
365 
366         if (pdata->enable)
367                 pdata->enable(dev);
368 
369         /* Mask all interrupts */
370         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
371 
372         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
373                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
374                 (unsigned long)iomem->start, t7l66xb->irq);
375 
376         t7l66xb_attach_irq(dev);
377 
378         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
379         t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);
380 
381         ret = mfd_add_devices(&dev->dev, dev->id,
382                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
383                               iomem, t7l66xb->irq_base, NULL);
384 
385         if (!ret)
386                 return 0;
387 
388         t7l66xb_detach_irq(dev);
389         iounmap(t7l66xb->scr);
390 err_ioremap:
391         release_resource(&t7l66xb->rscr);
392 err_request_scr:
393         clk_put(t7l66xb->clk48m);
394 err_clk48m_get:
395         clk_put(t7l66xb->clk32k);
396 err_clk32k_get:
397 err_noirq:
398         kfree(t7l66xb);
399         return ret;
400 }
401 
402 static int t7l66xb_remove(struct platform_device *dev)
403 {
404         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
405         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
406         int ret;
407 
408         ret = pdata->disable(dev);
409         clk_disable_unprepare(t7l66xb->clk48m);
410         clk_put(t7l66xb->clk48m);
411         clk_disable_unprepare(t7l66xb->clk32k);
412         clk_put(t7l66xb->clk32k);
413         t7l66xb_detach_irq(dev);
414         iounmap(t7l66xb->scr);
415         release_resource(&t7l66xb->rscr);
416         mfd_remove_devices(&dev->dev);
417         kfree(t7l66xb);
418 
419         return ret;
420 
421 }
422 
423 static struct platform_driver t7l66xb_platform_driver = {
424         .driver = {
425                 .name   = "t7l66xb",
426         },
427         .suspend        = t7l66xb_suspend,
428         .resume         = t7l66xb_resume,
429         .probe          = t7l66xb_probe,
430         .remove         = t7l66xb_remove,
431 };
432 
433 /*--------------------------------------------------------------------------*/
434 
435 module_platform_driver(t7l66xb_platform_driver);
436 
437 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
438 MODULE_LICENSE("GPL v2");
439 MODULE_AUTHOR("Ian Molton");
440 MODULE_ALIAS("platform:t7l66xb");
441 

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