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Linux/arch/powerpc/sysdev/qe_lib/qe_io.c

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  1 /*
  2  * arch/powerpc/sysdev/qe_lib/qe_io.c
  3  *
  4  * QE Parallel I/O ports configuration routines
  5  *
  6  * Copyright 2006 Freescale Semiconductor, Inc. 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/errno.h>
 20 #include <linux/module.h>
 21 #include <linux/ioport.h>
 22 
 23 #include <asm/io.h>
 24 #include <asm/qe.h>
 25 #include <asm/prom.h>
 26 #include <sysdev/fsl_soc.h>
 27 
 28 #undef DEBUG
 29 
 30 static struct qe_pio_regs __iomem *par_io;
 31 static int num_par_io_ports = 0;
 32 
 33 int par_io_init(struct device_node *np)
 34 {
 35         struct resource res;
 36         int ret;
 37         const u32 *num_ports;
 38 
 39         /* Map Parallel I/O ports registers */
 40         ret = of_address_to_resource(np, 0, &res);
 41         if (ret)
 42                 return ret;
 43         par_io = ioremap(res.start, resource_size(&res));
 44 
 45         num_ports = of_get_property(np, "num-ports", NULL);
 46         if (num_ports)
 47                 num_par_io_ports = *num_ports;
 48 
 49         return 0;
 50 }
 51 
 52 void __par_io_config_pin(struct qe_pio_regs __iomem *par_io, u8 pin, int dir,
 53                          int open_drain, int assignment, int has_irq)
 54 {
 55         u32 pin_mask1bit;
 56         u32 pin_mask2bits;
 57         u32 new_mask2bits;
 58         u32 tmp_val;
 59 
 60         /* calculate pin location for single and 2 bits information */
 61         pin_mask1bit = (u32) (1 << (QE_PIO_PINS - (pin + 1)));
 62 
 63         /* Set open drain, if required */
 64         tmp_val = in_be32(&par_io->cpodr);
 65         if (open_drain)
 66                 out_be32(&par_io->cpodr, pin_mask1bit | tmp_val);
 67         else
 68                 out_be32(&par_io->cpodr, ~pin_mask1bit & tmp_val);
 69 
 70         /* define direction */
 71         tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
 72                 in_be32(&par_io->cpdir2) :
 73                 in_be32(&par_io->cpdir1);
 74 
 75         /* get all bits mask for 2 bit per port */
 76         pin_mask2bits = (u32) (0x3 << (QE_PIO_PINS -
 77                                 (pin % (QE_PIO_PINS / 2) + 1) * 2));
 78 
 79         /* Get the final mask we need for the right definition */
 80         new_mask2bits = (u32) (dir << (QE_PIO_PINS -
 81                                 (pin % (QE_PIO_PINS / 2) + 1) * 2));
 82 
 83         /* clear and set 2 bits mask */
 84         if (pin > (QE_PIO_PINS / 2) - 1) {
 85                 out_be32(&par_io->cpdir2,
 86                          ~pin_mask2bits & tmp_val);
 87                 tmp_val &= ~pin_mask2bits;
 88                 out_be32(&par_io->cpdir2, new_mask2bits | tmp_val);
 89         } else {
 90                 out_be32(&par_io->cpdir1,
 91                          ~pin_mask2bits & tmp_val);
 92                 tmp_val &= ~pin_mask2bits;
 93                 out_be32(&par_io->cpdir1, new_mask2bits | tmp_val);
 94         }
 95         /* define pin assignment */
 96         tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
 97                 in_be32(&par_io->cppar2) :
 98                 in_be32(&par_io->cppar1);
 99 
100         new_mask2bits = (u32) (assignment << (QE_PIO_PINS -
101                         (pin % (QE_PIO_PINS / 2) + 1) * 2));
102         /* clear and set 2 bits mask */
103         if (pin > (QE_PIO_PINS / 2) - 1) {
104                 out_be32(&par_io->cppar2,
105                          ~pin_mask2bits & tmp_val);
106                 tmp_val &= ~pin_mask2bits;
107                 out_be32(&par_io->cppar2, new_mask2bits | tmp_val);
108         } else {
109                 out_be32(&par_io->cppar1,
110                          ~pin_mask2bits & tmp_val);
111                 tmp_val &= ~pin_mask2bits;
112                 out_be32(&par_io->cppar1, new_mask2bits | tmp_val);
113         }
114 }
115 EXPORT_SYMBOL(__par_io_config_pin);
116 
117 int par_io_config_pin(u8 port, u8 pin, int dir, int open_drain,
118                       int assignment, int has_irq)
119 {
120         if (!par_io || port >= num_par_io_ports)
121                 return -EINVAL;
122 
123         __par_io_config_pin(&par_io[port], pin, dir, open_drain, assignment,
124                             has_irq);
125         return 0;
126 }
127 EXPORT_SYMBOL(par_io_config_pin);
128 
129 int par_io_data_set(u8 port, u8 pin, u8 val)
130 {
131         u32 pin_mask, tmp_val;
132 
133         if (port >= num_par_io_ports)
134                 return -EINVAL;
135         if (pin >= QE_PIO_PINS)
136                 return -EINVAL;
137         /* calculate pin location */
138         pin_mask = (u32) (1 << (QE_PIO_PINS - 1 - pin));
139 
140         tmp_val = in_be32(&par_io[port].cpdata);
141 
142         if (val == 0)           /* clear */
143                 out_be32(&par_io[port].cpdata, ~pin_mask & tmp_val);
144         else                    /* set */
145                 out_be32(&par_io[port].cpdata, pin_mask | tmp_val);
146 
147         return 0;
148 }
149 EXPORT_SYMBOL(par_io_data_set);
150 
151 int par_io_of_config(struct device_node *np)
152 {
153         struct device_node *pio;
154         const phandle *ph;
155         int pio_map_len;
156         const unsigned int *pio_map;
157 
158         if (par_io == NULL) {
159                 printk(KERN_ERR "par_io not initialized\n");
160                 return -1;
161         }
162 
163         ph = of_get_property(np, "pio-handle", NULL);
164         if (ph == NULL) {
165                 printk(KERN_ERR "pio-handle not available\n");
166                 return -1;
167         }
168 
169         pio = of_find_node_by_phandle(*ph);
170 
171         pio_map = of_get_property(pio, "pio-map", &pio_map_len);
172         if (pio_map == NULL) {
173                 printk(KERN_ERR "pio-map is not set!\n");
174                 return -1;
175         }
176         pio_map_len /= sizeof(unsigned int);
177         if ((pio_map_len % 6) != 0) {
178                 printk(KERN_ERR "pio-map format wrong!\n");
179                 return -1;
180         }
181 
182         while (pio_map_len > 0) {
183                 par_io_config_pin((u8) pio_map[0], (u8) pio_map[1],
184                                 (int) pio_map[2], (int) pio_map[3],
185                                 (int) pio_map[4], (int) pio_map[5]);
186                 pio_map += 6;
187                 pio_map_len -= 6;
188         }
189         of_node_put(pio);
190         return 0;
191 }
192 EXPORT_SYMBOL(par_io_of_config);
193 

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