xref: /openbmc/linux/arch/arm/mach-sa1100/neponset.c (revision cd238eff) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * linux/arch/arm/mach-sa1100/neponset.c
4  */
5 #include <linux/err.h>
6 #include <linux/gpio/driver.h>
7 #include <linux/gpio/gpio-reg.h>
8 #include <linux/gpio/machine.h>
9 #include <linux/init.h>
10 #include <linux/ioport.h>
11 #include <linux/irq.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/platform_data/sa11x0-serial.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm.h>
17 #include <linux/serial_core.h>
18 #include <linux/slab.h>
19 #include <linux/smc91x.h>
20 
21 #include <asm/mach-types.h>
22 #include <asm/mach/map.h>
23 #include <asm/hardware/sa1111.h>
24 #include <linux/sizes.h>
25 
26 #include <mach/hardware.h>
27 #include <mach/assabet.h>
28 #include <mach/neponset.h>
29 #include <mach/irqs.h>
30 
31 #define NEP_IRQ_SMC91X	0
32 #define NEP_IRQ_USAR	1
33 #define NEP_IRQ_SA1111	2
34 #define NEP_IRQ_NR	3
35 
36 #define WHOAMI		0x00
37 #define LEDS		0x10
38 #define SWPK		0x20
39 #define IRR		0x24
40 #define KP_Y_IN		0x80
41 #define KP_X_OUT	0x90
42 #define NCR_0		0xa0
43 #define MDM_CTL_0	0xb0
44 #define MDM_CTL_1	0xb4
45 #define AUD_CTL		0xc0
46 
47 #define IRR_ETHERNET	(1 << 0)
48 #define IRR_USAR	(1 << 1)
49 #define IRR_SA1111	(1 << 2)
50 
51 #define NCR_NGPIO	7
52 
53 #define MDM_CTL0_RTS1	(1 << 0)
54 #define MDM_CTL0_DTR1	(1 << 1)
55 #define MDM_CTL0_RTS2	(1 << 2)
56 #define MDM_CTL0_DTR2	(1 << 3)
57 #define MDM_CTL0_NGPIO	4
58 
59 #define MDM_CTL1_CTS1	(1 << 0)
60 #define MDM_CTL1_DSR1	(1 << 1)
61 #define MDM_CTL1_DCD1	(1 << 2)
62 #define MDM_CTL1_CTS2	(1 << 3)
63 #define MDM_CTL1_DSR2	(1 << 4)
64 #define MDM_CTL1_DCD2	(1 << 5)
65 #define MDM_CTL1_NGPIO	6
66 
67 #define AUD_SEL_1341	(1 << 0)
68 #define AUD_MUTE_1341	(1 << 1)
69 #define AUD_NGPIO	2
70 
71 extern void sa1110_mb_disable(void);
72 
73 #define to_neponset_gpio_chip(x) container_of(x, struct neponset_gpio_chip, gc)
74 
75 static const char *neponset_ncr_names[] = {
76 	"gp01_off", "tp_power", "ms_power", "enet_osc",
77 	"spi_kb_wk_up", "a0vpp", "a1vpp"
78 };
79 
80 static const char *neponset_mdmctl0_names[] = {
81 	"rts3", "dtr3", "rts1", "dtr1",
82 };
83 
84 static const char *neponset_mdmctl1_names[] = {
85 	"cts3", "dsr3", "dcd3", "cts1", "dsr1", "dcd1"
86 };
87 
88 static const char *neponset_aud_names[] = {
89 	"sel_1341", "mute_1341",
90 };
91 
92 struct neponset_drvdata {
93 	void __iomem *base;
94 	struct platform_device *sa1111;
95 	struct platform_device *smc91x;
96 	unsigned irq_base;
97 	struct gpio_chip *gpio[4];
98 };
99 
100 static struct gpiod_lookup_table neponset_pcmcia_table = {
101 	.dev_id = "1800",
102 	.table = {
103 		GPIO_LOOKUP("sa1111", 1, "a0vcc", GPIO_ACTIVE_HIGH),
104 		GPIO_LOOKUP("sa1111", 0, "a1vcc", GPIO_ACTIVE_HIGH),
105 		GPIO_LOOKUP("neponset-ncr", 5, "a0vpp", GPIO_ACTIVE_HIGH),
106 		GPIO_LOOKUP("neponset-ncr", 6, "a1vpp", GPIO_ACTIVE_HIGH),
107 		GPIO_LOOKUP("sa1111", 2, "b0vcc", GPIO_ACTIVE_HIGH),
108 		GPIO_LOOKUP("sa1111", 3, "b1vcc", GPIO_ACTIVE_HIGH),
109 		{ },
110 	},
111 };
112 
113 static struct neponset_drvdata *nep;
114 
115 void neponset_ncr_frob(unsigned int mask, unsigned int val)
116 {
117 	struct neponset_drvdata *n = nep;
118 	unsigned long m = mask, v = val;
119 
120 	if (nep)
121 		n->gpio[0]->set_multiple(n->gpio[0], &m, &v);
122 	else
123 		WARN(1, "nep unset\n");
124 }
125 EXPORT_SYMBOL(neponset_ncr_frob);
126 
127 static void neponset_set_mctrl(struct uart_port *port, u_int mctrl)
128 {
129 	struct neponset_drvdata *n = nep;
130 	unsigned long mask, val = 0;
131 
132 	if (!n)
133 		return;
134 
135 	if (port->mapbase == _Ser1UTCR0) {
136 		mask = MDM_CTL0_RTS2 | MDM_CTL0_DTR2;
137 
138 		if (!(mctrl & TIOCM_RTS))
139 			val |= MDM_CTL0_RTS2;
140 
141 		if (!(mctrl & TIOCM_DTR))
142 			val |= MDM_CTL0_DTR2;
143 	} else if (port->mapbase == _Ser3UTCR0) {
144 		mask = MDM_CTL0_RTS1 | MDM_CTL0_DTR1;
145 
146 		if (!(mctrl & TIOCM_RTS))
147 			val |= MDM_CTL0_RTS1;
148 
149 		if (!(mctrl & TIOCM_DTR))
150 			val |= MDM_CTL0_DTR1;
151 	}
152 
153 	n->gpio[1]->set_multiple(n->gpio[1], &mask, &val);
154 }
155 
156 static u_int neponset_get_mctrl(struct uart_port *port)
157 {
158 	void __iomem *base = nep->base;
159 	u_int ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
160 	u_int mdm_ctl1;
161 
162 	if (!base)
163 		return ret;
164 
165 	mdm_ctl1 = readb_relaxed(base + MDM_CTL_1);
166 	if (port->mapbase == _Ser1UTCR0) {
167 		if (mdm_ctl1 & MDM_CTL1_DCD2)
168 			ret &= ~TIOCM_CD;
169 		if (mdm_ctl1 & MDM_CTL1_CTS2)
170 			ret &= ~TIOCM_CTS;
171 		if (mdm_ctl1 & MDM_CTL1_DSR2)
172 			ret &= ~TIOCM_DSR;
173 	} else if (port->mapbase == _Ser3UTCR0) {
174 		if (mdm_ctl1 & MDM_CTL1_DCD1)
175 			ret &= ~TIOCM_CD;
176 		if (mdm_ctl1 & MDM_CTL1_CTS1)
177 			ret &= ~TIOCM_CTS;
178 		if (mdm_ctl1 & MDM_CTL1_DSR1)
179 			ret &= ~TIOCM_DSR;
180 	}
181 
182 	return ret;
183 }
184 
185 static struct sa1100_port_fns neponset_port_fns = {
186 	.set_mctrl	= neponset_set_mctrl,
187 	.get_mctrl	= neponset_get_mctrl,
188 };
189 
190 /*
191  * Install handler for Neponset IRQ.  Note that we have to loop here
192  * since the ETHERNET and USAR IRQs are level based, and we need to
193  * ensure that the IRQ signal is deasserted before returning.  This
194  * is rather unfortunate.
195  */
196 static void neponset_irq_handler(struct irq_desc *desc)
197 {
198 	struct neponset_drvdata *d = irq_desc_get_handler_data(desc);
199 	unsigned int irr;
200 
201 	while (1) {
202 		/*
203 		 * Acknowledge the parent IRQ.
204 		 */
205 		desc->irq_data.chip->irq_ack(&desc->irq_data);
206 
207 		/*
208 		 * Read the interrupt reason register.  Let's have all
209 		 * active IRQ bits high.  Note: there is a typo in the
210 		 * Neponset user's guide for the SA1111 IRR level.
211 		 */
212 		irr = readb_relaxed(d->base + IRR);
213 		irr ^= IRR_ETHERNET | IRR_USAR;
214 
215 		if ((irr & (IRR_ETHERNET | IRR_USAR | IRR_SA1111)) == 0)
216 			break;
217 
218 		/*
219 		 * Since there is no individual mask, we have to
220 		 * mask the parent IRQ.  This is safe, since we'll
221 		 * recheck the register for any pending IRQs.
222 		 */
223 		if (irr & (IRR_ETHERNET | IRR_USAR)) {
224 			desc->irq_data.chip->irq_mask(&desc->irq_data);
225 
226 			/*
227 			 * Ack the interrupt now to prevent re-entering
228 			 * this neponset handler.  Again, this is safe
229 			 * since we'll check the IRR register prior to
230 			 * leaving.
231 			 */
232 			desc->irq_data.chip->irq_ack(&desc->irq_data);
233 
234 			if (irr & IRR_ETHERNET)
235 				generic_handle_irq(d->irq_base + NEP_IRQ_SMC91X);
236 
237 			if (irr & IRR_USAR)
238 				generic_handle_irq(d->irq_base + NEP_IRQ_USAR);
239 
240 			desc->irq_data.chip->irq_unmask(&desc->irq_data);
241 		}
242 
243 		if (irr & IRR_SA1111)
244 			generic_handle_irq(d->irq_base + NEP_IRQ_SA1111);
245 	}
246 }
247 
248 /* Yes, we really do not have any kind of masking or unmasking */
249 static void nochip_noop(struct irq_data *irq)
250 {
251 }
252 
253 static struct irq_chip nochip = {
254 	.name = "neponset",
255 	.irq_ack = nochip_noop,
256 	.irq_mask = nochip_noop,
257 	.irq_unmask = nochip_noop,
258 };
259 
260 static int neponset_init_gpio(struct gpio_chip **gcp,
261 	struct device *dev, const char *label, void __iomem *reg,
262 	unsigned num, bool in, const char *const * names)
263 {
264 	struct gpio_chip *gc;
265 
266 	gc = gpio_reg_init(dev, reg, -1, num, label, in ? 0xffffffff : 0,
267 			   readl_relaxed(reg), names, NULL, NULL);
268 	if (IS_ERR(gc))
269 		return PTR_ERR(gc);
270 
271 	*gcp = gc;
272 
273 	return 0;
274 }
275 
276 static struct sa1111_platform_data sa1111_info = {
277 	.disable_devs	= SA1111_DEVID_PS2_MSE,
278 };
279 
280 static int neponset_probe(struct platform_device *dev)
281 {
282 	struct neponset_drvdata *d;
283 	struct resource *nep_res, *sa1111_res, *smc91x_res;
284 	struct resource sa1111_resources[] = {
285 		DEFINE_RES_MEM(0x40000000, SZ_8K),
286 		{ .flags = IORESOURCE_IRQ },
287 	};
288 	struct platform_device_info sa1111_devinfo = {
289 		.parent = &dev->dev,
290 		.name = "sa1111",
291 		.id = 0,
292 		.res = sa1111_resources,
293 		.num_res = ARRAY_SIZE(sa1111_resources),
294 		.data = &sa1111_info,
295 		.size_data = sizeof(sa1111_info),
296 		.dma_mask = 0xffffffffUL,
297 	};
298 	struct resource smc91x_resources[] = {
299 		DEFINE_RES_MEM_NAMED(SA1100_CS3_PHYS,
300 			0x02000000, "smc91x-regs"),
301 		DEFINE_RES_MEM_NAMED(SA1100_CS3_PHYS + 0x02000000,
302 			0x02000000, "smc91x-attrib"),
303 		{ .flags = IORESOURCE_IRQ },
304 	};
305 	struct smc91x_platdata smc91x_platdata = {
306 		.flags = SMC91X_USE_8BIT | SMC91X_IO_SHIFT_2 | SMC91X_NOWAIT,
307 	};
308 	struct platform_device_info smc91x_devinfo = {
309 		.parent = &dev->dev,
310 		.name = "smc91x",
311 		.id = 0,
312 		.res = smc91x_resources,
313 		.num_res = ARRAY_SIZE(smc91x_resources),
314 		.data = &smc91x_platdata,
315 		.size_data = sizeof(smc91x_platdata),
316 	};
317 	int ret, irq;
318 
319 	if (nep)
320 		return -EBUSY;
321 
322 	irq = ret = platform_get_irq(dev, 0);
323 	if (ret < 0)
324 		goto err_alloc;
325 
326 	nep_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
327 	smc91x_res = platform_get_resource(dev, IORESOURCE_MEM, 1);
328 	sa1111_res = platform_get_resource(dev, IORESOURCE_MEM, 2);
329 	if (!nep_res || !smc91x_res || !sa1111_res) {
330 		ret = -ENXIO;
331 		goto err_alloc;
332 	}
333 
334 	d = kzalloc(sizeof(*d), GFP_KERNEL);
335 	if (!d) {
336 		ret = -ENOMEM;
337 		goto err_alloc;
338 	}
339 
340 	d->base = ioremap(nep_res->start, SZ_4K);
341 	if (!d->base) {
342 		ret = -ENOMEM;
343 		goto err_ioremap;
344 	}
345 
346 	if (readb_relaxed(d->base + WHOAMI) != 0x11) {
347 		dev_warn(&dev->dev, "Neponset board detected, but wrong ID: %02x\n",
348 			 readb_relaxed(d->base + WHOAMI));
349 		ret = -ENODEV;
350 		goto err_id;
351 	}
352 
353 	ret = irq_alloc_descs(-1, IRQ_BOARD_START, NEP_IRQ_NR, -1);
354 	if (ret <= 0) {
355 		dev_err(&dev->dev, "unable to allocate %u irqs: %d\n",
356 			NEP_IRQ_NR, ret);
357 		if (ret == 0)
358 			ret = -ENOMEM;
359 		goto err_irq_alloc;
360 	}
361 
362 	d->irq_base = ret;
363 
364 	irq_set_chip_and_handler(d->irq_base + NEP_IRQ_SMC91X, &nochip,
365 		handle_simple_irq);
366 	irq_clear_status_flags(d->irq_base + NEP_IRQ_SMC91X, IRQ_NOREQUEST | IRQ_NOPROBE);
367 	irq_set_chip_and_handler(d->irq_base + NEP_IRQ_USAR, &nochip,
368 		handle_simple_irq);
369 	irq_clear_status_flags(d->irq_base + NEP_IRQ_USAR, IRQ_NOREQUEST | IRQ_NOPROBE);
370 	irq_set_chip(d->irq_base + NEP_IRQ_SA1111, &nochip);
371 
372 	irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
373 	irq_set_chained_handler_and_data(irq, neponset_irq_handler, d);
374 
375 	/* Disable GPIO 0/1 drivers so the buttons work on the Assabet */
376 	writeb_relaxed(NCR_GP01_OFF, d->base + NCR_0);
377 
378 	neponset_init_gpio(&d->gpio[0], &dev->dev, "neponset-ncr",
379 			   d->base + NCR_0, NCR_NGPIO, false,
380 			   neponset_ncr_names);
381 	neponset_init_gpio(&d->gpio[1], &dev->dev, "neponset-mdm-ctl0",
382 			   d->base + MDM_CTL_0, MDM_CTL0_NGPIO, false,
383 			   neponset_mdmctl0_names);
384 	neponset_init_gpio(&d->gpio[2], &dev->dev, "neponset-mdm-ctl1",
385 			   d->base + MDM_CTL_1, MDM_CTL1_NGPIO, true,
386 			   neponset_mdmctl1_names);
387 	neponset_init_gpio(&d->gpio[3], &dev->dev, "neponset-aud-ctl",
388 			   d->base + AUD_CTL, AUD_NGPIO, false,
389 			   neponset_aud_names);
390 
391 	gpiod_add_lookup_table(&neponset_pcmcia_table);
392 
393 	/*
394 	 * We would set IRQ_GPIO25 to be a wake-up IRQ, but unfortunately
395 	 * something on the Neponset activates this IRQ on sleep (eth?)
396 	 */
397 #if 0
398 	enable_irq_wake(irq);
399 #endif
400 
401 	dev_info(&dev->dev, "Neponset daughter board, providing IRQ%u-%u\n",
402 		 d->irq_base, d->irq_base + NEP_IRQ_NR - 1);
403 	nep = d;
404 
405 	sa1100_register_uart_fns(&neponset_port_fns);
406 
407 	/* Ensure that the memory bus request/grant signals are setup */
408 	sa1110_mb_disable();
409 
410 	sa1111_resources[0].parent = sa1111_res;
411 	sa1111_resources[1].start = d->irq_base + NEP_IRQ_SA1111;
412 	sa1111_resources[1].end = d->irq_base + NEP_IRQ_SA1111;
413 	d->sa1111 = platform_device_register_full(&sa1111_devinfo);
414 
415 	smc91x_resources[0].parent = smc91x_res;
416 	smc91x_resources[1].parent = smc91x_res;
417 	smc91x_resources[2].start = d->irq_base + NEP_IRQ_SMC91X;
418 	smc91x_resources[2].end = d->irq_base + NEP_IRQ_SMC91X;
419 	d->smc91x = platform_device_register_full(&smc91x_devinfo);
420 
421 	platform_set_drvdata(dev, d);
422 
423 	return 0;
424 
425  err_irq_alloc:
426  err_id:
427 	iounmap(d->base);
428  err_ioremap:
429 	kfree(d);
430  err_alloc:
431 	return ret;
432 }
433 
434 static int neponset_remove(struct platform_device *dev)
435 {
436 	struct neponset_drvdata *d = platform_get_drvdata(dev);
437 	int irq = platform_get_irq(dev, 0);
438 
439 	if (!IS_ERR(d->sa1111))
440 		platform_device_unregister(d->sa1111);
441 	if (!IS_ERR(d->smc91x))
442 		platform_device_unregister(d->smc91x);
443 
444 	gpiod_remove_lookup_table(&neponset_pcmcia_table);
445 
446 	irq_set_chained_handler(irq, NULL);
447 	irq_free_descs(d->irq_base, NEP_IRQ_NR);
448 	nep = NULL;
449 	iounmap(d->base);
450 	kfree(d);
451 
452 	return 0;
453 }
454 
455 #ifdef CONFIG_PM_SLEEP
456 static int neponset_resume(struct device *dev)
457 {
458 	struct neponset_drvdata *d = dev_get_drvdata(dev);
459 	int i, ret = 0;
460 
461 	for (i = 0; i < ARRAY_SIZE(d->gpio); i++) {
462 		ret = gpio_reg_resume(d->gpio[i]);
463 		if (ret)
464 			break;
465 	}
466 
467 	return ret;
468 }
469 
470 static const struct dev_pm_ops neponset_pm_ops = {
471 	.resume_noirq = neponset_resume,
472 	.restore_noirq = neponset_resume,
473 };
474 #define PM_OPS &neponset_pm_ops
475 #else
476 #define PM_OPS NULL
477 #endif
478 
479 static struct platform_driver neponset_device_driver = {
480 	.probe		= neponset_probe,
481 	.remove		= neponset_remove,
482 	.driver		= {
483 		.name	= "neponset",
484 		.pm	= PM_OPS,
485 	},
486 };
487 
488 static int __init neponset_init(void)
489 {
490 	return platform_driver_register(&neponset_device_driver);
491 }
492 
493 subsys_initcall(neponset_init);
494