1 /*
2 * arch/powerpc/sysdev/qe_lib/qe_io.c
3 *
4 * QE Parallel I/O ports configuration routines
5 *
6 * Copyright (C) Freescale Semicondutor, Inc. 2006. All rights reserved.
7 *
8 * Author: Li Yang <LeoLi@freescale.com>
9 * Based on code from Shlomi Gridish <gridish@freescale.com>
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
15 */
16
17 #include <linux/stddef.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20 #include <linux/errno.h>
21 #include <linux/module.h>
22 #include <linux/ioport.h>
23
24 #include <asm/io.h>
25 #include <asm/qe.h>
26 #include <asm/prom.h>
27 #include <sysdev/fsl_soc.h>
28
29 #undef DEBUG
30
31 static struct qe_pio_regs __iomem *par_io;
32 static int num_par_io_ports = 0;
33
par_io_init(struct device_node * np)34 int par_io_init(struct device_node *np)
35 {
36 struct resource res;
37 int ret;
38 const u32 *num_ports;
39
40 /* Map Parallel I/O ports registers */
41 ret = of_address_to_resource(np, 0, &res);
42 if (ret)
43 return ret;
44 par_io = ioremap(res.start, resource_size(&res));
45
46 num_ports = of_get_property(np, "num-ports", NULL);
47 if (num_ports)
48 num_par_io_ports = *num_ports;
49
50 return 0;
51 }
52
__par_io_config_pin(struct qe_pio_regs __iomem * par_io,u8 pin,int dir,int open_drain,int assignment,int has_irq)53 void __par_io_config_pin(struct qe_pio_regs __iomem *par_io, u8 pin, int dir,
54 int open_drain, int assignment, int has_irq)
55 {
56 u32 pin_mask1bit;
57 u32 pin_mask2bits;
58 u32 new_mask2bits;
59 u32 tmp_val;
60
61 /* calculate pin location for single and 2 bits information */
62 pin_mask1bit = (u32) (1 << (QE_PIO_PINS - (pin + 1)));
63
64 /* Set open drain, if required */
65 tmp_val = in_be32(&par_io->cpodr);
66 if (open_drain)
67 out_be32(&par_io->cpodr, pin_mask1bit | tmp_val);
68 else
69 out_be32(&par_io->cpodr, ~pin_mask1bit & tmp_val);
70
71 /* define direction */
72 tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
73 in_be32(&par_io->cpdir2) :
74 in_be32(&par_io->cpdir1);
75
76 /* get all bits mask for 2 bit per port */
77 pin_mask2bits = (u32) (0x3 << (QE_PIO_PINS -
78 (pin % (QE_PIO_PINS / 2) + 1) * 2));
79
80 /* Get the final mask we need for the right definition */
81 new_mask2bits = (u32) (dir << (QE_PIO_PINS -
82 (pin % (QE_PIO_PINS / 2) + 1) * 2));
83
84 /* clear and set 2 bits mask */
85 if (pin > (QE_PIO_PINS / 2) - 1) {
86 out_be32(&par_io->cpdir2,
87 ~pin_mask2bits & tmp_val);
88 tmp_val &= ~pin_mask2bits;
89 out_be32(&par_io->cpdir2, new_mask2bits | tmp_val);
90 } else {
91 out_be32(&par_io->cpdir1,
92 ~pin_mask2bits & tmp_val);
93 tmp_val &= ~pin_mask2bits;
94 out_be32(&par_io->cpdir1, new_mask2bits | tmp_val);
95 }
96 /* define pin assignment */
97 tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
98 in_be32(&par_io->cppar2) :
99 in_be32(&par_io->cppar1);
100
101 new_mask2bits = (u32) (assignment << (QE_PIO_PINS -
102 (pin % (QE_PIO_PINS / 2) + 1) * 2));
103 /* clear and set 2 bits mask */
104 if (pin > (QE_PIO_PINS / 2) - 1) {
105 out_be32(&par_io->cppar2,
106 ~pin_mask2bits & tmp_val);
107 tmp_val &= ~pin_mask2bits;
108 out_be32(&par_io->cppar2, new_mask2bits | tmp_val);
109 } else {
110 out_be32(&par_io->cppar1,
111 ~pin_mask2bits & tmp_val);
112 tmp_val &= ~pin_mask2bits;
113 out_be32(&par_io->cppar1, new_mask2bits | tmp_val);
114 }
115 }
116 EXPORT_SYMBOL(__par_io_config_pin);
117
par_io_config_pin(u8 port,u8 pin,int dir,int open_drain,int assignment,int has_irq)118 int par_io_config_pin(u8 port, u8 pin, int dir, int open_drain,
119 int assignment, int has_irq)
120 {
121 if (!par_io || port >= num_par_io_ports)
122 return -EINVAL;
123
124 __par_io_config_pin(&par_io[port], pin, dir, open_drain, assignment,
125 has_irq);
126 return 0;
127 }
128 EXPORT_SYMBOL(par_io_config_pin);
129
par_io_data_set(u8 port,u8 pin,u8 val)130 int par_io_data_set(u8 port, u8 pin, u8 val)
131 {
132 u32 pin_mask, tmp_val;
133
134 if (port >= num_par_io_ports)
135 return -EINVAL;
136 if (pin >= QE_PIO_PINS)
137 return -EINVAL;
138 /* calculate pin location */
139 pin_mask = (u32) (1 << (QE_PIO_PINS - 1 - pin));
140
141 tmp_val = in_be32(&par_io[port].cpdata);
142
143 if (val == 0) /* clear */
144 out_be32(&par_io[port].cpdata, ~pin_mask & tmp_val);
145 else /* set */
146 out_be32(&par_io[port].cpdata, pin_mask | tmp_val);
147
148 return 0;
149 }
150 EXPORT_SYMBOL(par_io_data_set);
151
par_io_of_config(struct device_node * np)152 int par_io_of_config(struct device_node *np)
153 {
154 struct device_node *pio;
155 const phandle *ph;
156 int pio_map_len;
157 const unsigned int *pio_map;
158
159 if (par_io == NULL) {
160 printk(KERN_ERR "par_io not initialized\n");
161 return -1;
162 }
163
164 ph = of_get_property(np, "pio-handle", NULL);
165 if (ph == NULL) {
166 printk(KERN_ERR "pio-handle not available\n");
167 return -1;
168 }
169
170 pio = of_find_node_by_phandle(*ph);
171
172 pio_map = of_get_property(pio, "pio-map", &pio_map_len);
173 if (pio_map == NULL) {
174 printk(KERN_ERR "pio-map is not set!\n");
175 return -1;
176 }
177 pio_map_len /= sizeof(unsigned int);
178 if ((pio_map_len % 6) != 0) {
179 printk(KERN_ERR "pio-map format wrong!\n");
180 return -1;
181 }
182
183 while (pio_map_len > 0) {
184 par_io_config_pin((u8) pio_map[0], (u8) pio_map[1],
185 (int) pio_map[2], (int) pio_map[3],
186 (int) pio_map[4], (int) pio_map[5]);
187 pio_map += 6;
188 pio_map_len -= 6;
189 }
190 of_node_put(pio);
191 return 0;
192 }
193 EXPORT_SYMBOL(par_io_of_config);
194
195 #ifdef DEBUG
dump_par_io(void)196 static void dump_par_io(void)
197 {
198 unsigned int i;
199
200 printk(KERN_INFO "%s: par_io=%p\n", __func__, par_io);
201 for (i = 0; i < num_par_io_ports; i++) {
202 printk(KERN_INFO " cpodr[%u]=%08x\n", i,
203 in_be32(&par_io[i].cpodr));
204 printk(KERN_INFO " cpdata[%u]=%08x\n", i,
205 in_be32(&par_io[i].cpdata));
206 printk(KERN_INFO " cpdir1[%u]=%08x\n", i,
207 in_be32(&par_io[i].cpdir1));
208 printk(KERN_INFO " cpdir2[%u]=%08x\n", i,
209 in_be32(&par_io[i].cpdir2));
210 printk(KERN_INFO " cppar1[%u]=%08x\n", i,
211 in_be32(&par_io[i].cppar1));
212 printk(KERN_INFO " cppar2[%u]=%08x\n", i,
213 in_be32(&par_io[i].cppar2));
214 }
215
216 }
217 EXPORT_SYMBOL(dump_par_io);
218 #endif /* DEBUG */
219