aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-sa1100/neponset.c
blob: 052e4caedb89322e510d0eba42bc742a9c3850bd (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
/*
 * linux/arch/arm/mach-sa1100/neponset.c
 *
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ptrace.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/serial_core.h>
#include <linux/device.h>
#include <linux/slab.h>

#include <asm/hardware.h>
#include <asm/mach-types.h>
#include <asm/irq.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm/mach/serial_sa1100.h>
#include <asm/arch/assabet.h>
#include <asm/arch/neponset.h>
#include <asm/hardware/sa1111.h>
#include <asm/sizes.h>

/*
 * Install handler for Neponset IRQ.  Note that we have to loop here
 * since the ETHERNET and USAR IRQs are level based, and we need to
 * ensure that the IRQ signal is deasserted before returning.  This
 * is rather unfortunate.
 */
static void
neponset_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
{
	unsigned int irr;

	while (1) {
		struct irqdesc *d;

		/*
		 * Acknowledge the parent IRQ.
		 */
		desc->chip->ack(irq);

		/*
		 * Read the interrupt reason register.  Let's have all
		 * active IRQ bits high.  Note: there is a typo in the
		 * Neponset user's guide for the SA1111 IRR level.
		 */
		irr = IRR ^ (IRR_ETHERNET | IRR_USAR);

		if ((irr & (IRR_ETHERNET | IRR_USAR | IRR_SA1111)) == 0)
			break;

		/*
		 * Since there is no individual mask, we have to
		 * mask the parent IRQ.  This is safe, since we'll
		 * recheck the register for any pending IRQs.
		 */
		if (irr & (IRR_ETHERNET | IRR_USAR)) {
			desc->chip->mask(irq);

			if (irr & IRR_ETHERNET) {
				d = irq_desc + IRQ_NEPONSET_SMC9196;
				desc_handle_irq(IRQ_NEPONSET_SMC9196, d, regs);
			}

			if (irr & IRR_USAR) {
				d = irq_desc + IRQ_NEPONSET_USAR;
				desc_handle_irq(IRQ_NEPONSET_USAR, d, regs);
			}

			desc->chip->unmask(irq);
		}

		if (irr & IRR_SA1111) {
			d = irq_desc + IRQ_NEPONSET_SA1111;
			desc_handle_irq(IRQ_NEPONSET_SA1111, d, regs);
		}
	}
}

static void neponset_set_mctrl(struct uart_port *port, u_int mctrl)
{
	u_int mdm_ctl0 = MDM_CTL_0;

	if (port->mapbase == _Ser1UTCR0) {
		if (mctrl & TIOCM_RTS)
			mdm_ctl0 &= ~MDM_CTL0_RTS2;
		else
			mdm_ctl0 |= MDM_CTL0_RTS2;

		if (mctrl & TIOCM_DTR)
			mdm_ctl0 &= ~MDM_CTL0_DTR2;
		else
			mdm_ctl0 |= MDM_CTL0_DTR2;
	} else if (port->mapbase == _Ser3UTCR0) {
		if (mctrl & TIOCM_RTS)
			mdm_ctl0 &= ~MDM_CTL0_RTS1;
		else
			mdm_ctl0 |= MDM_CTL0_RTS1;

		if (mctrl & TIOCM_DTR)
			mdm_ctl0 &= ~MDM_CTL0_DTR1;
		else
			mdm_ctl0 |= MDM_CTL0_DTR1;
	}

	MDM_CTL_0 = mdm_ctl0;
}

static u_int neponset_get_mctrl(struct uart_port *port)
{
	u_int ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
	u_int mdm_ctl1 = MDM_CTL_1;

	if (port->mapbase == _Ser1UTCR0) {
		if (mdm_ctl1 & MDM_CTL1_DCD2)
			ret &= ~TIOCM_CD;
		if (mdm_ctl1 & MDM_CTL1_CTS2)
			ret &= ~TIOCM_CTS;
		if (mdm_ctl1 & MDM_CTL1_DSR2)
			ret &= ~TIOCM_DSR;
	} else if (port->mapbase == _Ser3UTCR0) {
		if (mdm_ctl1 & MDM_CTL1_DCD1)
			ret &= ~TIOCM_CD;
		if (mdm_ctl1 & MDM_CTL1_CTS1)
			ret &= ~TIOCM_CTS;
		if (mdm_ctl1 & MDM_CTL1_DSR1)
			ret &= ~TIOCM_DSR;
	}

	return ret;
}

static struct sa1100_port_fns neponset_port_fns __initdata = {
	.set_mctrl	= neponset_set_mctrl,
	.get_mctrl	= neponset_get_mctrl,
};

static int neponset_probe(struct device *dev)
{
	sa1100_register_uart_fns(&neponset_port_fns);

	/*
	 * Install handler for GPIO25.
	 */
	set_irq_type(IRQ_GPIO25, IRQT_RISING);
	set_irq_chained_handler(IRQ_GPIO25, neponset_irq_handler);

	/*
	 * We would set IRQ_GPIO25 to be a wake-up IRQ, but
	 * unfortunately something on the Neponset activates
	 * this IRQ on sleep (ethernet?)
	 */
#if 0
	enable_irq_wake(IRQ_GPIO25);
#endif

	/*
	 * Setup other Neponset IRQs.  SA1111 will be done by the
	 * generic SA1111 code.
	 */
	set_irq_handler(IRQ_NEPONSET_SMC9196, do_simple_IRQ);
	set_irq_flags(IRQ_NEPONSET_SMC9196, IRQF_VALID | IRQF_PROBE);
	set_irq_handler(IRQ_NEPONSET_USAR, do_simple_IRQ);
	set_irq_flags(IRQ_NEPONSET_USAR, IRQF_VALID | IRQF_PROBE);

	/*
	 * Disable GPIO 0/1 drivers so the buttons work on the module.
	 */
	NCR_0 = NCR_GP01_OFF;

	return 0;
}

#ifdef CONFIG_PM

/*
 * LDM power management.
 */
static int neponset_suspend(struct device *dev, pm_message_t state)
{
	/*
	 * Save state.
	 */
	if (!dev->power.saved_state)
		dev->power.saved_state = kmalloc(sizeof(unsigned int), GFP_KERNEL);
	if (!dev->power.saved_state)
		return -ENOMEM;

	*(unsigned int *)dev->power.saved_state = NCR_0;

	return 0;
}

static int neponset_resume(struct device *dev)
{
	if (dev->power.saved_state) {
		NCR_0 = *(unsigned int *)dev->power.saved_state;
		kfree(dev->power.saved_state);
		dev->power.saved_state = NULL;
	}

	return 0;
}

#else
#define neponset_suspend NULL
#define neponset_resume  NULL
#endif

static struct device_driver neponset_device_driver = {
	.name		= "neponset",
	.bus		= &platform_bus_type,
	.probe		= neponset_probe,
	.suspend	= neponset_suspend,
	.resume		= neponset_resume,
};

static struct resource neponset_resources[] = {
	[0] = {
		.start	= 0x10000000,
		.end	= 0x17ffffff,
		.flags	= IORESOURCE_MEM,
	},
};

static struct platform_device neponset_device = {
	.name		= "neponset",
	.id		= 0,
	.num_resources	= ARRAY_SIZE(neponset_resources),
	.resource	= neponset_resources,
};

static struct resource sa1111_resources[] = {
	[0] = {
		.start	= 0x40000000,
		.end	= 0x40001fff,
		.flags	= IORESOURCE_MEM,
	},
	[1] = {
		.start	= IRQ_NEPONSET_SA1111,
		.end	= IRQ_NEPONSET_SA1111,
		.flags	= IORESOURCE_IRQ,
	},
};

static u64 sa1111_dmamask = 0xffffffffUL;

static struct platform_device sa1111_device = {
	.name		= "sa1111",
	.id		= 0,
	.dev		= {
		.dma_mask = &sa1111_dmamask,
		.coherent_dma_mask = 0xffffffff,
	},
	.num_resources	= ARRAY_SIZE(sa1111_resources),
	.resource	= sa1111_resources,
};

static struct resource smc91x_resources[] = {
	[0] = {
		.name	= "smc91x-regs",
		.start	= SA1100_CS3_PHYS,
		.end	= SA1100_CS3_PHYS + 0x01ffffff,
		.flags	= IORESOURCE_MEM,
	},
	[1] = {
		.start	= IRQ_NEPONSET_SMC9196,
		.end	= IRQ_NEPONSET_SMC9196,
		.flags	= IORESOURCE_IRQ,
	},
	[2] = {
		.name	= "smc91x-attrib",
		.start	= SA1100_CS3_PHYS + 0x02000000,
		.end	= SA1100_CS3_PHYS + 0x03ffffff,
		.flags	= IORESOURCE_MEM,
	},
};

static struct platform_device smc91x_device = {
	.name		= "smc91x",
	.id		= 0,
	.num_resources	= ARRAY_SIZE(smc91x_resources),
	.resource	= smc91x_resources,
};

static struct platform_device *devices[] __initdata = {
	&neponset_device,
	&sa1111_device,
	&smc91x_device,
};

static int __init neponset_init(void)
{
	driver_register(&neponset_device_driver);

	/*
	 * The Neponset is only present on the Assabet machine type.
	 */
	if (!machine_is_assabet())
		return -ENODEV;

	/*
	 * Ensure that the memory bus request/grant signals are setup,
	 * and the grant is held in its inactive state, whether or not
	 * we actually have a Neponset attached.
	 */
	sa1110_mb_disable();

	if (!machine_has_neponset()) {
		printk(KERN_DEBUG "Neponset expansion board not present\n");
		return -ENODEV;
	}

	if (WHOAMI != 0x11) {
		printk(KERN_WARNING "Neponset board detected, but "
			"wrong ID: %02x\n", WHOAMI);
		return -ENODEV;
	}

	return platform_add_devices(devices, ARRAY_SIZE(devices));
}

subsys_initcall(neponset_init);

static struct map_desc neponset_io_desc[] __initdata = {
	{	/* System Registers */
		.virtual	=  0xf3000000,
		.pfn		= __phys_to_pfn(0x10000000),
		.length		= SZ_1M,
		.type		= MT_DEVICE
	}, {	/* SA-1111 */
		.virtual	=  0xf4000000,
		.pfn		= __phys_to_pfn(0x40000000),
		.length		= SZ_1M,
		.type		= MT_DEVICE
	}
};

void __init neponset_map_io(void)
{
	iotable_init(neponset_io_desc, ARRAY_SIZE(neponset_io_desc));
}