summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/sysdev/qe_lib/qe_io.c
blob: a88807b3dd578b7b4e2ed423d5305ef41dad00e3 (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
/*
 * arch/powerpc/sysdev/qe_lib/qe_io.c
 *
 * QE Parallel I/O ports configuration routines
 *
 * Copyright 2006 Freescale Semiconductor, Inc. All rights reserved.
 *
 * Author: Li Yang <LeoLi@freescale.com>
 * Based on code from Shlomi Gridish <gridish@freescale.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/ioport.h>

#include <asm/io.h>
#include <asm/qe.h>
#include <asm/prom.h>
#include <sysdev/fsl_soc.h>

#undef DEBUG

static struct qe_pio_regs __iomem *par_io;
static int num_par_io_ports = 0;

int par_io_init(struct device_node *np)
{
	struct resource res;
	int ret;
	const u32 *num_ports;

	/* Map Parallel I/O ports registers */
	ret = of_address_to_resource(np, 0, &res);
	if (ret)
		return ret;
	par_io = ioremap(res.start, resource_size(&res));

	num_ports = of_get_property(np, "num-ports", NULL);
	if (num_ports)
		num_par_io_ports = *num_ports;

	return 0;
}

void __par_io_config_pin(struct qe_pio_regs __iomem *par_io, u8 pin, int dir,
			 int open_drain, int assignment, int has_irq)
{
	u32 pin_mask1bit;
	u32 pin_mask2bits;
	u32 new_mask2bits;
	u32 tmp_val;

	/* calculate pin location for single and 2 bits information */
	pin_mask1bit = (u32) (1 << (QE_PIO_PINS - (pin + 1)));

	/* Set open drain, if required */
	tmp_val = in_be32(&par_io->cpodr);
	if (open_drain)
		out_be32(&par_io->cpodr, pin_mask1bit | tmp_val);
	else
		out_be32(&par_io->cpodr, ~pin_mask1bit & tmp_val);

	/* define direction */
	tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
		in_be32(&par_io->cpdir2) :
		in_be32(&par_io->cpdir1);

	/* get all bits mask for 2 bit per port */
	pin_mask2bits = (u32) (0x3 << (QE_PIO_PINS -
				(pin % (QE_PIO_PINS / 2) + 1) * 2));

	/* Get the final mask we need for the right definition */
	new_mask2bits = (u32) (dir << (QE_PIO_PINS -
				(pin % (QE_PIO_PINS / 2) + 1) * 2));

	/* clear and set 2 bits mask */
	if (pin > (QE_PIO_PINS / 2) - 1) {
		out_be32(&par_io->cpdir2,
			 ~pin_mask2bits & tmp_val);
		tmp_val &= ~pin_mask2bits;
		out_be32(&par_io->cpdir2, new_mask2bits | tmp_val);
	} else {
		out_be32(&par_io->cpdir1,
			 ~pin_mask2bits & tmp_val);
		tmp_val &= ~pin_mask2bits;
		out_be32(&par_io->cpdir1, new_mask2bits | tmp_val);
	}
	/* define pin assignment */
	tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
		in_be32(&par_io->cppar2) :
		in_be32(&par_io->cppar1);

	new_mask2bits = (u32) (assignment << (QE_PIO_PINS -
			(pin % (QE_PIO_PINS / 2) + 1) * 2));
	/* clear and set 2 bits mask */
	if (pin > (QE_PIO_PINS / 2) - 1) {
		out_be32(&par_io->cppar2,
			 ~pin_mask2bits & tmp_val);
		tmp_val &= ~pin_mask2bits;
		out_be32(&par_io->cppar2, new_mask2bits | tmp_val);
	} else {
		out_be32(&par_io->cppar1,
			 ~pin_mask2bits & tmp_val);
		tmp_val &= ~pin_mask2bits;
		out_be32(&par_io->cppar1, new_mask2bits | tmp_val);
	}
}
EXPORT_SYMBOL(__par_io_config_pin);

int par_io_config_pin(u8 port, u8 pin, int dir, int open_drain,
		      int assignment, int has_irq)
{
	if (!par_io || port >= num_par_io_ports)
		return -EINVAL;

	__par_io_config_pin(&par_io[port], pin, dir, open_drain, assignment,
			    has_irq);
	return 0;
}
EXPORT_SYMBOL(par_io_config_pin);

int par_io_data_set(u8 port, u8 pin, u8 val)
{
	u32 pin_mask, tmp_val;

	if (port >= num_par_io_ports)
		return -EINVAL;
	if (pin >= QE_PIO_PINS)
		return -EINVAL;
	/* calculate pin location */
	pin_mask = (u32) (1 << (QE_PIO_PINS - 1 - pin));

	tmp_val = in_be32(&par_io[port].cpdata);

	if (val == 0)		/* clear */
		out_be32(&par_io[port].cpdata, ~pin_mask & tmp_val);
	else			/* set */
		out_be32(&par_io[port].cpdata, pin_mask | tmp_val);

	return 0;
}
EXPORT_SYMBOL(par_io_data_set);

int par_io_of_config(struct device_node *np)
{
	struct device_node *pio;
	const phandle *ph;
	int pio_map_len;
	const unsigned int *pio_map;

	if (par_io == NULL) {
		printk(KERN_ERR "par_io not initialized\n");
		return -1;
	}

	ph = of_get_property(np, "pio-handle", NULL);
	if (ph == NULL) {
		printk(KERN_ERR "pio-handle not available\n");
		return -1;
	}

	pio = of_find_node_by_phandle(*ph);

	pio_map = of_get_property(pio, "pio-map", &pio_map_len);
	if (pio_map == NULL) {
		printk(KERN_ERR "pio-map is not set!\n");
		return -1;
	}
	pio_map_len /= sizeof(unsigned int);
	if ((pio_map_len % 6) != 0) {
		printk(KERN_ERR "pio-map format wrong!\n");
		return -1;
	}

	while (pio_map_len > 0) {
		par_io_config_pin((u8) pio_map[0], (u8) pio_map[1],
				(int) pio_map[2], (int) pio_map[3],
				(int) pio_map[4], (int) pio_map[5]);
		pio_map += 6;
		pio_map_len -= 6;
	}
	of_node_put(pio);
	return 0;
}
EXPORT_SYMBOL(par_io_of_config);

#ifdef DEBUG
static void dump_par_io(void)
{
	unsigned int i;

	printk(KERN_INFO "%s: par_io=%p\n", __func__, par_io);
	for (i = 0; i < num_par_io_ports; i++) {
		printk(KERN_INFO "	cpodr[%u]=%08x\n", i,
			in_be32(&par_io[i].cpodr));
		printk(KERN_INFO "	cpdata[%u]=%08x\n", i,
			in_be32(&par_io[i].cpdata));
		printk(KERN_INFO "	cpdir1[%u]=%08x\n", i,
			in_be32(&par_io[i].cpdir1));
		printk(KERN_INFO "	cpdir2[%u]=%08x\n", i,
			in_be32(&par_io[i].cpdir2));
		printk(KERN_INFO "	cppar1[%u]=%08x\n", i,
			in_be32(&par_io[i].cppar1));
		printk(KERN_INFO "	cppar2[%u]=%08x\n", i,
			in_be32(&par_io[i].cppar2));
	}

}
EXPORT_SYMBOL(dump_par_io);
#endif /* DEBUG */
OpenPOWER on IntegriCloud