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 {
41 .start = 0x800,
42 .end = 0x9ff,
43 .flags = IORESOURCE_MEM,
44 },
45 {
46 .start = IRQ_T7L66XB_MMC,
47 .end = IRQ_T7L66XB_MMC,
48 .flags = IORESOURCE_IRQ,
49 },
50 };
51
52 #define SCR_REVID 0x08 /* b Revision ID */
53 #define SCR_IMR 0x42 /* b Interrupt Mask */
54 #define SCR_DEV_CTL 0xe0 /* b Device control */
55 #define SCR_ISR 0xe1 /* b Interrupt Status */
56 #define SCR_GPO_OC 0xf0 /* b GPO output control */
57 #define SCR_GPO_OS 0xf1 /* b GPO output enable */
58 #define SCR_GPI_S 0xf2 /* w GPI status */
59 #define SCR_APDC 0xf8 /* b Active pullup down ctrl */
60
61 #define SCR_DEV_CTL_USB BIT(0) /* USB enable */
62 #define SCR_DEV_CTL_MMC BIT(1) /* MMC enable */
63
64 /*--------------------------------------------------------------------------*/
65
66 struct t7l66xb {
67 void __iomem *scr;
68 /* Lock to protect registers requiring read/modify/write ops. */
69 raw_spinlock_t lock;
70
71 struct resource rscr;
72 struct clk *clk48m;
73 struct clk *clk32k;
74 int irq;
75 int irq_base;
76 };
77
78 /*--------------------------------------------------------------------------*/
79
t7l66xb_mmc_enable(struct platform_device * mmc)80 static int t7l66xb_mmc_enable(struct platform_device *mmc)
81 {
82 struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
83 unsigned long flags;
84 u8 dev_ctl;
85 int ret;
86
87 ret = clk_prepare_enable(t7l66xb->clk32k);
88 if (ret)
89 return ret;
90
91 raw_spin_lock_irqsave(&t7l66xb->lock, flags);
92
93 dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
94 dev_ctl |= SCR_DEV_CTL_MMC;
95 tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
96
97 raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
98
99 tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
100 t7l66xb_mmc_resources[0].start & 0xfffe);
101
102 return 0;
103 }
104
t7l66xb_mmc_disable(struct platform_device * mmc)105 static int t7l66xb_mmc_disable(struct platform_device *mmc)
106 {
107 struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
108 unsigned long flags;
109 u8 dev_ctl;
110
111 raw_spin_lock_irqsave(&t7l66xb->lock, flags);
112
113 dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
114 dev_ctl &= ~SCR_DEV_CTL_MMC;
115 tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
116
117 raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
118
119 clk_disable_unprepare(t7l66xb->clk32k);
120
121 return 0;
122 }
123
t7l66xb_mmc_pwr(struct platform_device * mmc,int state)124 static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
125 {
126 struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
127
128 tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
129 }
130
t7l66xb_mmc_clk_div(struct platform_device * mmc,int state)131 static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
132 {
133 struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
134
135 tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
136 }
137
138 /*--------------------------------------------------------------------------*/
139
140 static struct tmio_mmc_data t7166xb_mmc_data = {
141 .hclk = 24000000,
142 .set_pwr = t7l66xb_mmc_pwr,
143 .set_clk_div = t7l66xb_mmc_clk_div,
144 };
145
146 static const struct resource t7l66xb_nand_resources[] = {
147 {
148 .start = 0xc00,
149 .end = 0xc07,
150 .flags = IORESOURCE_MEM,
151 },
152 {
153 .start = 0x0100,
154 .end = 0x01ff,
155 .flags = IORESOURCE_MEM,
156 },
157 {
158 .start = IRQ_T7L66XB_NAND,
159 .end = IRQ_T7L66XB_NAND,
160 .flags = IORESOURCE_IRQ,
161 },
162 };
163
164 static struct mfd_cell t7l66xb_cells[] = {
165 [T7L66XB_CELL_MMC] = {
166 .name = "tmio-mmc",
167 .enable = t7l66xb_mmc_enable,
168 .disable = t7l66xb_mmc_disable,
169 .platform_data = &t7166xb_mmc_data,
170 .pdata_size = sizeof(t7166xb_mmc_data),
171 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
172 .resources = t7l66xb_mmc_resources,
173 },
174 [T7L66XB_CELL_NAND] = {
175 .name = "tmio-nand",
176 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
177 .resources = t7l66xb_nand_resources,
178 },
179 };
180
181 /*--------------------------------------------------------------------------*/
182
183 /* Handle the T7L66XB interrupt mux */
t7l66xb_irq(struct irq_desc * desc)184 static void t7l66xb_irq(struct irq_desc *desc)
185 {
186 struct t7l66xb *t7l66xb = irq_desc_get_handler_data(desc);
187 unsigned int isr;
188 unsigned int i, irq_base;
189
190 irq_base = t7l66xb->irq_base;
191
192 while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
193 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
194 for (i = 0; i < T7L66XB_NR_IRQS; i++)
195 if (isr & (1 << i))
196 generic_handle_irq(irq_base + i);
197 }
198
t7l66xb_irq_mask(struct irq_data * data)199 static void t7l66xb_irq_mask(struct irq_data *data)
200 {
201 struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
202 unsigned long flags;
203 u8 imr;
204
205 raw_spin_lock_irqsave(&t7l66xb->lock, flags);
206 imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
207 imr |= 1 << (data->irq - t7l66xb->irq_base);
208 tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
209 raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
210 }
211
t7l66xb_irq_unmask(struct irq_data * data)212 static void t7l66xb_irq_unmask(struct irq_data *data)
213 {
214 struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
215 unsigned long flags;
216 u8 imr;
217
218 raw_spin_lock_irqsave(&t7l66xb->lock, flags);
219 imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
220 imr &= ~(1 << (data->irq - t7l66xb->irq_base));
221 tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
222 raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
223 }
224
225 static struct irq_chip t7l66xb_chip = {
226 .name = "t7l66xb",
227 .irq_ack = t7l66xb_irq_mask,
228 .irq_mask = t7l66xb_irq_mask,
229 .irq_unmask = t7l66xb_irq_unmask,
230 };
231
232 /*--------------------------------------------------------------------------*/
233
234 /* Install the IRQ handler */
t7l66xb_attach_irq(struct platform_device * dev)235 static void t7l66xb_attach_irq(struct platform_device *dev)
236 {
237 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
238 unsigned int irq, irq_base;
239
240 irq_base = t7l66xb->irq_base;
241
242 for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
243 irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
244 irq_set_chip_data(irq, t7l66xb);
245 }
246
247 irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
248 irq_set_chained_handler_and_data(t7l66xb->irq, t7l66xb_irq, t7l66xb);
249 }
250
t7l66xb_detach_irq(struct platform_device * dev)251 static void t7l66xb_detach_irq(struct platform_device *dev)
252 {
253 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
254 unsigned int irq, irq_base;
255
256 irq_base = t7l66xb->irq_base;
257
258 irq_set_chained_handler_and_data(t7l66xb->irq, NULL, NULL);
259
260 for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
261 irq_set_chip(irq, NULL);
262 irq_set_chip_data(irq, NULL);
263 }
264 }
265
266 /*--------------------------------------------------------------------------*/
267
268 #ifdef CONFIG_PM
t7l66xb_suspend(struct platform_device * dev,pm_message_t state)269 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
270 {
271 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
272 struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
273
274 if (pdata && pdata->suspend)
275 pdata->suspend(dev);
276 clk_disable_unprepare(t7l66xb->clk48m);
277
278 return 0;
279 }
280
t7l66xb_resume(struct platform_device * dev)281 static int t7l66xb_resume(struct platform_device *dev)
282 {
283 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
284 struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
285 int ret;
286
287 ret = clk_prepare_enable(t7l66xb->clk48m);
288 if (ret)
289 return ret;
290
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
t7l66xb_probe(struct platform_device * dev)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 raw_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 ret = clk_prepare_enable(t7l66xb->clk48m);
365 if (ret)
366 goto err_clk_enable;
367
368 if (pdata->enable)
369 pdata->enable(dev);
370
371 /* Mask all interrupts */
372 tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
373
374 printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
375 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
376 (unsigned long)iomem->start, t7l66xb->irq);
377
378 t7l66xb_attach_irq(dev);
379
380 t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
381 t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);
382
383 ret = mfd_add_devices(&dev->dev, dev->id,
384 t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
385 iomem, t7l66xb->irq_base, NULL);
386
387 if (!ret)
388 return 0;
389
390 t7l66xb_detach_irq(dev);
391 clk_disable_unprepare(t7l66xb->clk48m);
392 err_clk_enable:
393 iounmap(t7l66xb->scr);
394 err_ioremap:
395 release_resource(&t7l66xb->rscr);
396 err_request_scr:
397 clk_put(t7l66xb->clk48m);
398 err_clk48m_get:
399 clk_put(t7l66xb->clk32k);
400 err_clk32k_get:
401 err_noirq:
402 kfree(t7l66xb);
403 return ret;
404 }
405
t7l66xb_remove(struct platform_device * dev)406 static int t7l66xb_remove(struct platform_device *dev)
407 {
408 struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
409 struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
410 int ret;
411
412 ret = pdata->disable(dev);
413 clk_disable_unprepare(t7l66xb->clk48m);
414 clk_put(t7l66xb->clk48m);
415 clk_disable_unprepare(t7l66xb->clk32k);
416 clk_put(t7l66xb->clk32k);
417 t7l66xb_detach_irq(dev);
418 iounmap(t7l66xb->scr);
419 release_resource(&t7l66xb->rscr);
420 mfd_remove_devices(&dev->dev);
421 kfree(t7l66xb);
422
423 return ret;
424
425 }
426
427 static struct platform_driver t7l66xb_platform_driver = {
428 .driver = {
429 .name = "t7l66xb",
430 },
431 .suspend = t7l66xb_suspend,
432 .resume = t7l66xb_resume,
433 .probe = t7l66xb_probe,
434 .remove = t7l66xb_remove,
435 };
436
437 /*--------------------------------------------------------------------------*/
438
439 module_platform_driver(t7l66xb_platform_driver);
440
441 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
442 MODULE_LICENSE("GPL v2");
443 MODULE_AUTHOR("Ian Molton");
444 MODULE_ALIAS("platform:t7l66xb");
445
