root/drivers/soc/fsl/qe/qe_io.c

DEFINITIONS

1. par_io_init
2. __par_io_config_pin
3. par_io_config_pin
4. par_io_data_set
5. par_io_of_config

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * arch/powerpc/sysdev/qe_lib/qe_io.c
   4  *
   5  * QE Parallel I/O ports configuration routines
   6  *
   7  * Copyright 2006 Freescale Semiconductor, Inc. All rights reserved.
   8  *
   9  * Author: Li Yang <LeoLi@freescale.com>
  10  * Based on code from Shlomi Gridish <gridish@freescale.com>
  11  */
  12 
  13 #include <linux/stddef.h>
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/module.h>
  17 #include <linux/ioport.h>
  18 
  19 #include <asm/io.h>
  20 #include <soc/fsl/qe/qe.h>
  21 #include <asm/prom.h>
  22 #include <sysdev/fsl_soc.h>
  23 
  24 #undef DEBUG
  25 
  26 static struct qe_pio_regs __iomem *par_io;
  27 static int num_par_io_ports = 0;
  28 
  29 int par_io_init(struct device_node *np)
  30 {
  31         struct resource res;
  32         int ret;
  33         const u32 *num_ports;
  34 
  35         /* Map Parallel I/O ports registers */
  36         ret = of_address_to_resource(np, 0, &res);
  37         if (ret)
  38                 return ret;
  39         par_io = ioremap(res.start, resource_size(&res));
  40 
  41         num_ports = of_get_property(np, "num-ports", NULL);
  42         if (num_ports)
  43                 num_par_io_ports = *num_ports;
  44 
  45         return 0;
  46 }
  47 
  48 void __par_io_config_pin(struct qe_pio_regs __iomem *par_io, u8 pin, int dir,
  49                          int open_drain, int assignment, int has_irq)
  50 {
  51         u32 pin_mask1bit;
  52         u32 pin_mask2bits;
  53         u32 new_mask2bits;
  54         u32 tmp_val;
  55 
  56         /* calculate pin location for single and 2 bits information */
  57         pin_mask1bit = (u32) (1 << (QE_PIO_PINS - (pin + 1)));
  58 
  59         /* Set open drain, if required */
  60         tmp_val = in_be32(&par_io->cpodr);
  61         if (open_drain)
  62                 out_be32(&par_io->cpodr, pin_mask1bit | tmp_val);
  63         else
  64                 out_be32(&par_io->cpodr, ~pin_mask1bit & tmp_val);
  65 
  66         /* define direction */
  67         tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
  68                 in_be32(&par_io->cpdir2) :
  69                 in_be32(&par_io->cpdir1);
  70 
  71         /* get all bits mask for 2 bit per port */
  72         pin_mask2bits = (u32) (0x3 << (QE_PIO_PINS -
  73                                 (pin % (QE_PIO_PINS / 2) + 1) * 2));
  74 
  75         /* Get the final mask we need for the right definition */
  76         new_mask2bits = (u32) (dir << (QE_PIO_PINS -
  77                                 (pin % (QE_PIO_PINS / 2) + 1) * 2));
  78 
  79         /* clear and set 2 bits mask */
  80         if (pin > (QE_PIO_PINS / 2) - 1) {
  81                 out_be32(&par_io->cpdir2,
  82                          ~pin_mask2bits & tmp_val);
  83                 tmp_val &= ~pin_mask2bits;
  84                 out_be32(&par_io->cpdir2, new_mask2bits | tmp_val);
  85         } else {
  86                 out_be32(&par_io->cpdir1,
  87                          ~pin_mask2bits & tmp_val);
  88                 tmp_val &= ~pin_mask2bits;
  89                 out_be32(&par_io->cpdir1, new_mask2bits | tmp_val);
  90         }
  91         /* define pin assignment */
  92         tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
  93                 in_be32(&par_io->cppar2) :
  94                 in_be32(&par_io->cppar1);
  95 
  96         new_mask2bits = (u32) (assignment << (QE_PIO_PINS -
  97                         (pin % (QE_PIO_PINS / 2) + 1) * 2));
  98         /* clear and set 2 bits mask */
  99         if (pin > (QE_PIO_PINS / 2) - 1) {
 100                 out_be32(&par_io->cppar2,
 101                          ~pin_mask2bits & tmp_val);
 102                 tmp_val &= ~pin_mask2bits;
 103                 out_be32(&par_io->cppar2, new_mask2bits | tmp_val);
 104         } else {
 105                 out_be32(&par_io->cppar1,
 106                          ~pin_mask2bits & tmp_val);
 107                 tmp_val &= ~pin_mask2bits;
 108                 out_be32(&par_io->cppar1, new_mask2bits | tmp_val);
 109         }
 110 }
 111 EXPORT_SYMBOL(__par_io_config_pin);
 112 
 113 int par_io_config_pin(u8 port, u8 pin, int dir, int open_drain,
 114                       int assignment, int has_irq)
 115 {
 116         if (!par_io || port >= num_par_io_ports)
 117                 return -EINVAL;
 118 
 119         __par_io_config_pin(&par_io[port], pin, dir, open_drain, assignment,
 120                             has_irq);
 121         return 0;
 122 }
 123 EXPORT_SYMBOL(par_io_config_pin);
 124 
 125 int par_io_data_set(u8 port, u8 pin, u8 val)
 126 {
 127         u32 pin_mask, tmp_val;
 128 
 129         if (port >= num_par_io_ports)
 130                 return -EINVAL;
 131         if (pin >= QE_PIO_PINS)
 132                 return -EINVAL;
 133         /* calculate pin location */
 134         pin_mask = (u32) (1 << (QE_PIO_PINS - 1 - pin));
 135 
 136         tmp_val = in_be32(&par_io[port].cpdata);
 137 
 138         if (val == 0)           /* clear */
 139                 out_be32(&par_io[port].cpdata, ~pin_mask & tmp_val);
 140         else                    /* set */
 141                 out_be32(&par_io[port].cpdata, pin_mask | tmp_val);
 142 
 143         return 0;
 144 }
 145 EXPORT_SYMBOL(par_io_data_set);
 146 
 147 int par_io_of_config(struct device_node *np)
 148 {
 149         struct device_node *pio;
 150         const phandle *ph;
 151         int pio_map_len;
 152         const unsigned int *pio_map;
 153 
 154         if (par_io == NULL) {
 155                 printk(KERN_ERR "par_io not initialized\n");
 156                 return -1;
 157         }
 158 
 159         ph = of_get_property(np, "pio-handle", NULL);
 160         if (ph == NULL) {
 161                 printk(KERN_ERR "pio-handle not available\n");
 162                 return -1;
 163         }
 164 
 165         pio = of_find_node_by_phandle(*ph);
 166 
 167         pio_map = of_get_property(pio, "pio-map", &pio_map_len);
 168         if (pio_map == NULL) {
 169                 printk(KERN_ERR "pio-map is not set!\n");
 170                 return -1;
 171         }
 172         pio_map_len /= sizeof(unsigned int);
 173         if ((pio_map_len % 6) != 0) {
 174                 printk(KERN_ERR "pio-map format wrong!\n");
 175                 return -1;
 176         }
 177 
 178         while (pio_map_len > 0) {
 179                 par_io_config_pin((u8) pio_map[0], (u8) pio_map[1],
 180                                 (int) pio_map[2], (int) pio_map[3],
 181                                 (int) pio_map[4], (int) pio_map[5]);
 182                 pio_map += 6;
 183                 pio_map_len -= 6;
 184         }
 185         of_node_put(pio);
 186         return 0;
 187 }
 188 EXPORT_SYMBOL(par_io_of_config);