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 (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
  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, res.end - res.start + 1);
  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
  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
 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
 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
 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
 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 */