summaryrefslogtreecommitdiff
path: root/arch/sparc/include/asm/parport.h
blob: d9830621c906bb67dae70ebc65eed5addd0f4bff (plain)
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
/* parport.h: sparc64 specific parport initialization and dma.
 *
 * Copyright (C) 1999  Eddie C. Dost  (ecd@skynet.be)
 */

#ifndef _ASM_SPARC64_PARPORT_H
#define _ASM_SPARC64_PARPORT_H 1

#include <linux/of_device.h>

#include <asm/ebus.h>
#include <asm/ns87303.h>
#include <asm/prom.h>

#define PARPORT_PC_MAX_PORTS	PARPORT_MAX

/*
 * While sparc64 doesn't have an ISA DMA API, we provide something that looks
 * close enough to make parport_pc happy
 */
#define HAS_DMA

static DEFINE_SPINLOCK(dma_spin_lock);

#define claim_dma_lock() \
({	unsigned long flags; \
	spin_lock_irqsave(&dma_spin_lock, flags); \
	flags; \
})

#define release_dma_lock(__flags) \
	spin_unlock_irqrestore(&dma_spin_lock, __flags);

static struct sparc_ebus_info {
	struct ebus_dma_info info;
	unsigned int addr;
	unsigned int count;
	int lock;

	struct parport *port;
} sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];

static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);

static inline int request_dma(unsigned int dmanr, const char *device_id)
{
	if (dmanr >= PARPORT_PC_MAX_PORTS)
		return -EINVAL;
	if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
		return -EBUSY;
	return 0;
}

static inline void free_dma(unsigned int dmanr)
{
	if (dmanr >= PARPORT_PC_MAX_PORTS) {
		printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
		return;
	}
	if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
		printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
		return;
	}
}

static inline void enable_dma(unsigned int dmanr)
{
	ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);

	if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
			     sparc_ebus_dmas[dmanr].addr,
			     sparc_ebus_dmas[dmanr].count))
		BUG();
}

static inline void disable_dma(unsigned int dmanr)
{
	ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
}

static inline void clear_dma_ff(unsigned int dmanr)
{
	/* nothing */
}

static inline void set_dma_mode(unsigned int dmanr, char mode)
{
	ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
}

static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
{
	sparc_ebus_dmas[dmanr].addr = addr;
}

static inline void set_dma_count(unsigned int dmanr, unsigned int count)
{
	sparc_ebus_dmas[dmanr].count = count;
}

static inline unsigned int get_dma_residue(unsigned int dmanr)
{
	return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
}

static int __devinit ecpp_probe(struct of_device *op, const struct of_device_id *match)
{
	unsigned long base = op->resource[0].start;
	unsigned long config = op->resource[1].start;
	unsigned long d_base = op->resource[2].start;
	unsigned long d_len;
	struct device_node *parent;
	struct parport *p;
	int slot, err;

	parent = op->node->parent;
	if (!strcmp(parent->name, "dma")) {
		p = parport_pc_probe_port(base, base + 0x400,
					  op->irqs[0], PARPORT_DMA_NOFIFO,
					  op->dev.parent->parent);
		if (!p)
			return -ENOMEM;
		dev_set_drvdata(&op->dev, p);
		return 0;
	}

	for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) {
		if (!test_and_set_bit(slot, dma_slot_map))
			break;
	}
	err = -ENODEV;
	if (slot >= PARPORT_PC_MAX_PORTS)
		goto out_err;

	spin_lock_init(&sparc_ebus_dmas[slot].info.lock);

	d_len = (op->resource[2].end - d_base) + 1UL;
	sparc_ebus_dmas[slot].info.regs =
		of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA");

	if (!sparc_ebus_dmas[slot].info.regs)
		goto out_clear_map;

	sparc_ebus_dmas[slot].info.flags = 0;
	sparc_ebus_dmas[slot].info.callback = NULL;
	sparc_ebus_dmas[slot].info.client_cookie = NULL;
	sparc_ebus_dmas[slot].info.irq = 0xdeadbeef;
	strcpy(sparc_ebus_dmas[slot].info.name, "parport");
	if (ebus_dma_register(&sparc_ebus_dmas[slot].info))
		goto out_unmap_regs;

	ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1);

	/* Configure IRQ to Push Pull, Level Low */
	/* Enable ECP, set bit 2 of the CTR first */
	outb(0x04, base + 0x02);
	ns87303_modify(config, PCR,
		       PCR_EPP_ENABLE |
		       PCR_IRQ_ODRAIN,
		       PCR_ECP_ENABLE |
		       PCR_ECP_CLK_ENA |
		       PCR_IRQ_POLAR);

	/* CTR bit 5 controls direction of port */
	ns87303_modify(config, PTR,
		       0, PTR_LPT_REG_DIR);

	p = parport_pc_probe_port(base, base + 0x400,
				  op->irqs[0],
				  slot,
				  op->dev.parent);
	err = -ENOMEM;
	if (!p)
		goto out_disable_irq;

	dev_set_drvdata(&op->dev, p);

	return 0;

out_disable_irq:
	ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
	ebus_dma_unregister(&sparc_ebus_dmas[slot].info);

out_unmap_regs:
	of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);

out_clear_map:
	clear_bit(slot, dma_slot_map);

out_err:
	return err;
}

static int __devexit ecpp_remove(struct of_device *op)
{
	struct parport *p = dev_get_drvdata(&op->dev);
	int slot = p->dma;

	parport_pc_unregister_port(p);

	if (slot != PARPORT_DMA_NOFIFO) {
		unsigned long d_base = op->resource[2].start;
		unsigned long d_len;

		d_len = (op->resource[2].end - d_base) + 1UL;

		ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
		ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
		of_iounmap(&op->resource[2],
			   sparc_ebus_dmas[slot].info.regs,
			   d_len);
		clear_bit(slot, dma_slot_map);
	}

	return 0;
}

static struct of_device_id ecpp_match[] = {
	{
		.name = "ecpp",
	},
	{
		.name = "parallel",
		.compatible = "ecpp",
	},
	{
		.name = "parallel",
		.compatible = "ns87317-ecpp",
	},
	{},
};

static struct of_platform_driver ecpp_driver = {
	.name			= "ecpp",
	.match_table		= ecpp_match,
	.probe			= ecpp_probe,
	.remove			= __devexit_p(ecpp_remove),
};

static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
{
	of_register_driver(&ecpp_driver, &of_bus_type);

	return 0;
}

#endif /* !(_ASM_SPARC64_PARPORT_H */