GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / mfd / t7l66xb.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *
4  * Toshiba T7L66XB core mfd support
5  *
6  * Copyright (c) 2005, 2007, 2008 Ian Molton
7  * Copyright (c) 2008 Dmitry Baryshkov
8  *
9  * T7L66 features:
10  *
11  * Supported in this driver:
12  * SD/MMC
13  * SM/NAND flash controller
14  *
15  * As yet not supported
16  * GPIO interface (on NAND pins)
17  * Serial interface
18  * TFT 'interface converter'
19  * PCMCIA interface logic
20  */
21
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/err.h>
25 #include <linux/io.h>
26 #include <linux/slab.h>
27 #include <linux/irq.h>
28 #include <linux/clk.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 static const struct resource t7l66xb_mmc_resources[] = {
40         DEFINE_RES_MEM(0x800, 0x200),
41         DEFINE_RES_IRQ(IRQ_T7L66XB_MMC)
42 };
43
44 #define SCR_REVID       0x08            /* b Revision ID        */
45 #define SCR_IMR         0x42            /* b Interrupt Mask     */
46 #define SCR_DEV_CTL     0xe0            /* b Device control     */
47 #define SCR_ISR         0xe1            /* b Interrupt Status   */
48 #define SCR_GPO_OC      0xf0            /* b GPO output control */
49 #define SCR_GPO_OS      0xf1            /* b GPO output enable  */
50 #define SCR_GPI_S       0xf2            /* w GPI status         */
51 #define SCR_APDC        0xf8            /* b Active pullup down ctrl */
52
53 #define SCR_DEV_CTL_USB         BIT(0)  /* USB enable           */
54 #define SCR_DEV_CTL_MMC         BIT(1)  /* MMC enable           */
55
56 /*--------------------------------------------------------------------------*/
57
58 struct t7l66xb {
59         void __iomem            *scr;
60         /* Lock to protect registers requiring read/modify/write ops. */
61         raw_spinlock_t          lock;
62
63         struct resource         rscr;
64         struct clk              *clk48m;
65         struct clk              *clk32k;
66         int                     irq;
67         int                     irq_base;
68 };
69
70 /*--------------------------------------------------------------------------*/
71
72 static int t7l66xb_mmc_enable(struct platform_device *mmc)
73 {
74         struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
75         unsigned long flags;
76         u8 dev_ctl;
77         int ret;
78
79         ret = clk_prepare_enable(t7l66xb->clk32k);
80         if (ret)
81                 return ret;
82
83         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
84
85         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
86         dev_ctl |= SCR_DEV_CTL_MMC;
87         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
88
89         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
90
91         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
92                 t7l66xb_mmc_resources[0].start & 0xfffe);
93
94         return 0;
95 }
96
97 static int t7l66xb_mmc_disable(struct platform_device *mmc)
98 {
99         struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
100         unsigned long flags;
101         u8 dev_ctl;
102
103         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
104
105         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
106         dev_ctl &= ~SCR_DEV_CTL_MMC;
107         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
108
109         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
110
111         clk_disable_unprepare(t7l66xb->clk32k);
112
113         return 0;
114 }
115
116 static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
117 {
118         struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
119
120         tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
121 }
122
123 static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
124 {
125         struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
126
127         tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
128 }
129
130 /*--------------------------------------------------------------------------*/
131
132 static struct tmio_mmc_data t7166xb_mmc_data = {
133         .hclk = 24000000,
134         .set_pwr = t7l66xb_mmc_pwr,
135         .set_clk_div = t7l66xb_mmc_clk_div,
136 };
137
138 static const struct resource t7l66xb_nand_resources[] = {
139         {
140                 .start  = 0xc00,
141                 .end    = 0xc07,
142                 .flags  = IORESOURCE_MEM,
143         },
144         {
145                 .start  = 0x0100,
146                 .end    = 0x01ff,
147                 .flags  = IORESOURCE_MEM,
148         },
149         {
150                 .start  = IRQ_T7L66XB_NAND,
151                 .end    = IRQ_T7L66XB_NAND,
152                 .flags  = IORESOURCE_IRQ,
153         },
154 };
155
156 static struct mfd_cell t7l66xb_cells[] = {
157         [T7L66XB_CELL_MMC] = {
158                 .name = "tmio-mmc",
159                 .enable = t7l66xb_mmc_enable,
160                 .disable = t7l66xb_mmc_disable,
161                 .platform_data = &t7166xb_mmc_data,
162                 .pdata_size    = sizeof(t7166xb_mmc_data),
163                 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
164                 .resources = t7l66xb_mmc_resources,
165         },
166         [T7L66XB_CELL_NAND] = {
167                 .name = "tmio-nand",
168                 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
169                 .resources = t7l66xb_nand_resources,
170         },
171 };
172
173 /*--------------------------------------------------------------------------*/
174
175 /* Handle the T7L66XB interrupt mux */
176 static void t7l66xb_irq(struct irq_desc *desc)
177 {
178         struct t7l66xb *t7l66xb = irq_desc_get_handler_data(desc);
179         unsigned int isr;
180         unsigned int i, irq_base;
181
182         irq_base = t7l66xb->irq_base;
183
184         while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
185                                 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
186                 for (i = 0; i < T7L66XB_NR_IRQS; i++)
187                         if (isr & (1 << i))
188                                 generic_handle_irq(irq_base + i);
189 }
190
191 static void t7l66xb_irq_mask(struct irq_data *data)
192 {
193         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
194         unsigned long                   flags;
195         u8 imr;
196
197         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
198         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
199         imr |= 1 << (data->irq - t7l66xb->irq_base);
200         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
201         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
202 }
203
204 static void t7l66xb_irq_unmask(struct irq_data *data)
205 {
206         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
207         unsigned long flags;
208         u8 imr;
209
210         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
211         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
212         imr &= ~(1 << (data->irq - t7l66xb->irq_base));
213         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
214         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
215 }
216
217 static struct irq_chip t7l66xb_chip = {
218         .name           = "t7l66xb",
219         .irq_ack        = t7l66xb_irq_mask,
220         .irq_mask       = t7l66xb_irq_mask,
221         .irq_unmask     = t7l66xb_irq_unmask,
222 };
223
224 /*--------------------------------------------------------------------------*/
225
226 /* Install the IRQ handler */
227 static void t7l66xb_attach_irq(struct platform_device *dev)
228 {
229         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
230         unsigned int irq, irq_base;
231
232         irq_base = t7l66xb->irq_base;
233
234         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
235                 irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
236                 irq_set_chip_data(irq, t7l66xb);
237         }
238
239         irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
240         irq_set_chained_handler_and_data(t7l66xb->irq, t7l66xb_irq, t7l66xb);
241 }
242
243 static void t7l66xb_detach_irq(struct platform_device *dev)
244 {
245         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
246         unsigned int irq, irq_base;
247
248         irq_base = t7l66xb->irq_base;
249
250         irq_set_chained_handler_and_data(t7l66xb->irq, NULL, NULL);
251
252         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
253                 irq_set_chip(irq, NULL);
254                 irq_set_chip_data(irq, NULL);
255         }
256 }
257
258 /*--------------------------------------------------------------------------*/
259
260 #ifdef CONFIG_PM
261 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
262 {
263         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
264         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
265
266         if (pdata && pdata->suspend)
267                 pdata->suspend(dev);
268         clk_disable_unprepare(t7l66xb->clk48m);
269
270         return 0;
271 }
272
273 static int t7l66xb_resume(struct platform_device *dev)
274 {
275         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
276         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
277         int ret;
278
279         ret = clk_prepare_enable(t7l66xb->clk48m);
280         if (ret)
281                 return ret;
282
283         if (pdata && pdata->resume)
284                 pdata->resume(dev);
285
286         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
287                 t7l66xb_mmc_resources[0].start & 0xfffe);
288
289         return 0;
290 }
291 #else
292 #define t7l66xb_suspend NULL
293 #define t7l66xb_resume  NULL
294 #endif
295
296 /*--------------------------------------------------------------------------*/
297
298 static int t7l66xb_probe(struct platform_device *dev)
299 {
300         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
301         struct t7l66xb *t7l66xb;
302         struct resource *iomem, *rscr;
303         int ret;
304
305         if (!pdata)
306                 return -EINVAL;
307
308         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
309         if (!iomem)
310                 return -EINVAL;
311
312         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
313         if (!t7l66xb)
314                 return -ENOMEM;
315
316         raw_spin_lock_init(&t7l66xb->lock);
317
318         platform_set_drvdata(dev, t7l66xb);
319
320         ret = platform_get_irq(dev, 0);
321         if (ret >= 0)
322                 t7l66xb->irq = ret;
323         else
324                 goto err_noirq;
325
326         t7l66xb->irq_base = pdata->irq_base;
327
328         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
329         if (IS_ERR(t7l66xb->clk32k)) {
330                 ret = PTR_ERR(t7l66xb->clk32k);
331                 goto err_clk32k_get;
332         }
333
334         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
335         if (IS_ERR(t7l66xb->clk48m)) {
336                 ret = PTR_ERR(t7l66xb->clk48m);
337                 goto err_clk48m_get;
338         }
339
340         rscr = &t7l66xb->rscr;
341         rscr->name = "t7l66xb-core";
342         rscr->start = iomem->start;
343         rscr->end = iomem->start + 0xff;
344         rscr->flags = IORESOURCE_MEM;
345
346         ret = request_resource(iomem, rscr);
347         if (ret)
348                 goto err_request_scr;
349
350         t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
351         if (!t7l66xb->scr) {
352                 ret = -ENOMEM;
353                 goto err_ioremap;
354         }
355
356         ret = clk_prepare_enable(t7l66xb->clk48m);
357         if (ret)
358                 goto err_clk_enable;
359
360         if (pdata->enable)
361                 pdata->enable(dev);
362
363         /* Mask all interrupts */
364         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
365
366         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
367                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
368                 (unsigned long)iomem->start, t7l66xb->irq);
369
370         t7l66xb_attach_irq(dev);
371
372         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
373         t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);
374
375         ret = mfd_add_devices(&dev->dev, dev->id,
376                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
377                               iomem, t7l66xb->irq_base, NULL);
378
379         if (!ret)
380                 return 0;
381
382         t7l66xb_detach_irq(dev);
383         clk_disable_unprepare(t7l66xb->clk48m);
384 err_clk_enable:
385         iounmap(t7l66xb->scr);
386 err_ioremap:
387         release_resource(&t7l66xb->rscr);
388 err_request_scr:
389         clk_put(t7l66xb->clk48m);
390 err_clk48m_get:
391         clk_put(t7l66xb->clk32k);
392 err_clk32k_get:
393 err_noirq:
394         kfree(t7l66xb);
395         return ret;
396 }
397
398 static int t7l66xb_remove(struct platform_device *dev)
399 {
400         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
401         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
402         int ret;
403
404         ret = pdata->disable(dev);
405         clk_disable_unprepare(t7l66xb->clk48m);
406         clk_put(t7l66xb->clk48m);
407         clk_disable_unprepare(t7l66xb->clk32k);
408         clk_put(t7l66xb->clk32k);
409         t7l66xb_detach_irq(dev);
410         iounmap(t7l66xb->scr);
411         release_resource(&t7l66xb->rscr);
412         mfd_remove_devices(&dev->dev);
413         kfree(t7l66xb);
414
415         return ret;
416
417 }
418
419 static struct platform_driver t7l66xb_platform_driver = {
420         .driver = {
421                 .name   = "t7l66xb",
422         },
423         .suspend        = t7l66xb_suspend,
424         .resume         = t7l66xb_resume,
425         .probe          = t7l66xb_probe,
426         .remove         = t7l66xb_remove,
427 };
428
429 /*--------------------------------------------------------------------------*/
430
431 module_platform_driver(t7l66xb_platform_driver);
432
433 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
434 MODULE_LICENSE("GPL v2");
435 MODULE_AUTHOR("Ian Molton");
436 MODULE_ALIAS("platform:t7l66xb");