release/src-rt-6.x/linux/linux-2.6/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/prom.h>
  26 #include <sysdev/fsl_soc.h>
  27
  28 #undef DEBUG
  29
  30 #define NUM_OF_PINS     32
  31
  32 struct port_regs {
  33         __be32  cpodr;          /* Open drain register */
  34         __be32  cpdata;         /* Data register */
  35         __be32  cpdir1;         /* Direction register */
  36         __be32  cpdir2;         /* Direction register */
  37         __be32  cppar1;         /* Pin assignment register */
  38         __be32  cppar2;         /* Pin assignment register */
  39 };
  40
  41 static struct port_regs *par_io = NULL;
  42 static int num_par_io_ports = 0;
  43
  44 int par_io_init(struct device_node *np)
  45 {
  46         struct resource res;
  47         int ret;
  48         const u32 *num_ports;
  49
  50         /* Map Parallel I/O ports registers */
  51         ret = of_address_to_resource(np, 0, &res);
  52         if (ret)
  53                 return ret;
  54         par_io = ioremap(res.start, res.end - res.start + 1);
  55
  56         num_ports = of_get_property(np, "num-ports", NULL);
  57         if (num_ports)
  58                 num_par_io_ports = *num_ports;
  59
  60         return 0;
  61 }
  62
  63 int par_io_config_pin(u8 port, u8 pin, int dir, int open_drain,
  64                       int assignment, int has_irq)
  65 {
  66         u32 pin_mask1bit, pin_mask2bits, new_mask2bits, tmp_val;
  67
  68         if (!par_io)
  69                 return -1;
  70
  71         /* calculate pin location for single and 2 bits information */
  72         pin_mask1bit = (u32) (1 << (NUM_OF_PINS - (pin + 1)));
  73
  74         /* Set open drain, if required */
  75         tmp_val = in_be32(&par_io[port].cpodr);
  76         if (open_drain)
  77                 out_be32(&par_io[port].cpodr, pin_mask1bit | tmp_val);
  78         else
  79                 out_be32(&par_io[port].cpodr, ~pin_mask1bit & tmp_val);
  80
  81         /* define direction */
  82         tmp_val = (pin > (NUM_OF_PINS / 2) - 1) ?
  83                 in_be32(&par_io[port].cpdir2) :
  84                 in_be32(&par_io[port].cpdir1);
  85
  86         /* get all bits mask for 2 bit per port */
  87         pin_mask2bits = (u32) (0x3 << (NUM_OF_PINS -
  88                                 (pin % (NUM_OF_PINS / 2) + 1) * 2));
  89
  90         /* Get the final mask we need for the right definition */
  91         new_mask2bits = (u32) (dir << (NUM_OF_PINS -
  92                                 (pin % (NUM_OF_PINS / 2) + 1) * 2));
  93
  94         /* clear and set 2 bits mask */
  95         if (pin > (NUM_OF_PINS / 2) - 1) {
  96                 out_be32(&par_io[port].cpdir2,
  97                          ~pin_mask2bits & tmp_val);
  98                 tmp_val &= ~pin_mask2bits;
  99                 out_be32(&par_io[port].cpdir2, new_mask2bits | tmp_val);
 100         } else {
 101                 out_be32(&par_io[port].cpdir1,
 102                          ~pin_mask2bits & tmp_val);
 103                 tmp_val &= ~pin_mask2bits;
 104                 out_be32(&par_io[port].cpdir1, new_mask2bits | tmp_val);
 105         }
 106         /* define pin assignment */
 107         tmp_val = (pin > (NUM_OF_PINS / 2) - 1) ?
 108                 in_be32(&par_io[port].cppar2) :
 109                 in_be32(&par_io[port].cppar1);
 110
 111         new_mask2bits = (u32) (assignment << (NUM_OF_PINS -
 112                         (pin % (NUM_OF_PINS / 2) + 1) * 2));
 113         /* clear and set 2 bits mask */
 114         if (pin > (NUM_OF_PINS / 2) - 1) {
 115                 out_be32(&par_io[port].cppar2,
 116                          ~pin_mask2bits & tmp_val);
 117                 tmp_val &= ~pin_mask2bits;
 118                 out_be32(&par_io[port].cppar2, new_mask2bits | tmp_val);
 119         } else {
 120                 out_be32(&par_io[port].cppar1,
 121                          ~pin_mask2bits & tmp_val);
 122                 tmp_val &= ~pin_mask2bits;
 123                 out_be32(&par_io[port].cppar1, new_mask2bits | tmp_val);
 124         }
 125
 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 >= NUM_OF_PINS)
 137                 return -EINVAL;
 138         /* calculate pin location */
 139         pin_mask = (u32) (1 << (NUM_OF_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 == 0) {
 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         int i;
 199
 200         printk(KERN_INFO "PAR IO registars:\n");
 201         printk(KERN_INFO "Base address: 0x%08x\n", (u32) par_io);
 202         for (i = 0; i < num_par_io_ports; i++) {
 203                 printk(KERN_INFO "cpodr[%d] : addr - 0x%08x, val - 0x%08x\n",
 204                        i, (u32) & par_io[i].cpodr,
 205                        in_be32(&par_io[i].cpodr));
 206                 printk(KERN_INFO "cpdata[%d]: addr - 0x%08x, val - 0x%08x\n",
 207                        i, (u32) & par_io[i].cpdata,
 208                        in_be32(&par_io[i].cpdata));
 209                 printk(KERN_INFO "cpdir1[%d]: addr - 0x%08x, val - 0x%08x\n",
 210                        i, (u32) & par_io[i].cpdir1,
 211                        in_be32(&par_io[i].cpdir1));
 212                 printk(KERN_INFO "cpdir2[%d]: addr - 0x%08x, val - 0x%08x\n",
 213                        i, (u32) & par_io[i].cpdir2,
 214                        in_be32(&par_io[i].cpdir2));
 215                 printk(KERN_INFO "cppar1[%d]: addr - 0x%08x, val - 0x%08x\n",
 216                        i, (u32) & par_io[i].cppar1,
 217                        in_be32(&par_io[i].cppar1));
 218                 printk(KERN_INFO "cppar2[%d]: addr - 0x%08x, val - 0x%08x\n",
 219                        i, (u32) & par_io[i].cppar2,
 220                        in_be32(&par_io[i].cppar2));
 221         }
 222
 223 }
 224 EXPORT_SYMBOL(dump_par_io);
 225 #endif /* DEBUG */