arch/powerpc/sysdev/qe_lib/qe_io.c

   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
 194 #ifdef DEBUG
 195 static void dump_par_io(void)
 196 {
 197         unsigned int i;
 198
 199         printk(KERN_INFO "%s: par_io=%p\n", __func__, par_io);
 200         for (i = 0; i < num_par_io_ports; i++) {
 201                 printk(KERN_INFO "      cpodr[%u]=%08x\n", i,
 202                         in_be32(&par_io[i].cpodr));
 203                 printk(KERN_INFO "      cpdata[%u]=%08x\n", i,
 204                         in_be32(&par_io[i].cpdata));
 205                 printk(KERN_INFO "      cpdir1[%u]=%08x\n", i,
 206                         in_be32(&par_io[i].cpdir1));
 207                 printk(KERN_INFO "      cpdir2[%u]=%08x\n", i,
 208                         in_be32(&par_io[i].cpdir2));
 209                 printk(KERN_INFO "      cppar1[%u]=%08x\n", i,
 210                         in_be32(&par_io[i].cppar1));
 211                 printk(KERN_INFO "      cppar2[%u]=%08x\n", i,
 212                         in_be32(&par_io[i].cppar2));
 213         }
 214
 215 }
 216 EXPORT_SYMBOL(dump_par_io);
 217 #endif /* DEBUG */