sound/aoa/soundbus/i2sbus/control.c

   1 /*
   2  * i2sbus driver -- bus control routines
   3  *
   4  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
   5  *
   6  * GPL v2, can be found in COPYING.
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/delay.h>
  11 #include <linux/slab.h>
  12
  13 #include <asm/io.h>
  14 #include <asm/prom.h>
  15 #include <asm/macio.h>
  16 #include <asm/pmac_feature.h>
  17 #include <asm/pmac_pfunc.h>
  18 #include <asm/keylargo.h>
  19
  20 #include "i2sbus.h"
  21
  22 int i2sbus_control_init(struct macio_dev* dev, struct i2sbus_control **c)
  23 {
  24         *c = kzalloc(sizeof(struct i2sbus_control), GFP_KERNEL);
  25         if (!*c)
  26                 return -ENOMEM;
  27
  28         INIT_LIST_HEAD(&(*c)->list);
  29
  30         (*c)->macio = dev->bus->chip;
  31         return 0;
  32 }
  33
  34 void i2sbus_control_destroy(struct i2sbus_control *c)
  35 {
  36         kfree(c);
  37 }
  38
  39 /* this is serialised externally */
  40 int i2sbus_control_add_dev(struct i2sbus_control *c,
  41                            struct i2sbus_dev *i2sdev)
  42 {
  43         struct device_node *np;
  44
  45         np = i2sdev->sound.ofdev.dev.of_node;
  46         i2sdev->enable = pmf_find_function(np, "enable");
  47         i2sdev->cell_enable = pmf_find_function(np, "cell-enable");
  48         i2sdev->clock_enable = pmf_find_function(np, "clock-enable");
  49         i2sdev->cell_disable = pmf_find_function(np, "cell-disable");
  50         i2sdev->clock_disable = pmf_find_function(np, "clock-disable");
  51
  52         /* if the bus number is not 0 or 1 we absolutely need to use
  53          * the platform functions -- there's nothing in Darwin that
  54          * would allow seeing a system behind what the FCRs are then,
  55          * and I don't want to go parsing a bunch of platform functions
  56          * by hand to try finding a system... */
  57         if (i2sdev->bus_number != 0 && i2sdev->bus_number != 1 &&
  58             (!i2sdev->enable ||
  59              !i2sdev->cell_enable || !i2sdev->clock_enable ||
  60              !i2sdev->cell_disable || !i2sdev->clock_disable)) {
  61                 pmf_put_function(i2sdev->enable);
  62                 pmf_put_function(i2sdev->cell_enable);
  63                 pmf_put_function(i2sdev->clock_enable);
  64                 pmf_put_function(i2sdev->cell_disable);
  65                 pmf_put_function(i2sdev->clock_disable);
  66                 return -ENODEV;
  67         }
  68
  69         list_add(&i2sdev->item, &c->list);
  70
  71         return 0;
  72 }
  73
  74 void i2sbus_control_remove_dev(struct i2sbus_control *c,
  75                                struct i2sbus_dev *i2sdev)
  76 {
  77         /* this is serialised externally */
  78         list_del(&i2sdev->item);
  79         if (list_empty(&c->list))
  80                 i2sbus_control_destroy(c);
  81 }
  82
  83 int i2sbus_control_enable(struct i2sbus_control *c,
  84                           struct i2sbus_dev *i2sdev)
  85 {
  86         struct pmf_args args = { .count = 0 };
  87         struct macio_chip *macio = c->macio;
  88
  89         if (i2sdev->enable)
  90                 return pmf_call_one(i2sdev->enable, &args);
  91
  92         if (macio == NULL || macio->base == NULL)
  93                 return -ENODEV;
  94
  95         switch (i2sdev->bus_number) {
  96         case 0:
  97                 /* these need to be locked or done through
  98                  * newly created feature calls! */
  99                 MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE);
 100                 break;
 101         case 1:
 102                 MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_ENABLE);
 103                 break;
 104         default:
 105                 return -ENODEV;
 106         }
 107         return 0;
 108 }
 109
 110 int i2sbus_control_cell(struct i2sbus_control *c,
 111                         struct i2sbus_dev *i2sdev,
 112                         int enable)
 113 {
 114         struct pmf_args args = { .count = 0 };
 115         struct macio_chip *macio = c->macio;
 116
 117         switch (enable) {
 118         case 0:
 119                 if (i2sdev->cell_disable)
 120                         return pmf_call_one(i2sdev->cell_disable, &args);
 121                 break;
 122         case 1:
 123                 if (i2sdev->cell_enable)
 124                         return pmf_call_one(i2sdev->cell_enable, &args);
 125                 break;
 126         default:
 127                 printk(KERN_ERR "i2sbus: INVALID CELL ENABLE VALUE\n");
 128                 return -ENODEV;
 129         }
 130
 131         if (macio == NULL || macio->base == NULL)
 132                 return -ENODEV;
 133
 134         switch (i2sdev->bus_number) {
 135         case 0:
 136                 if (enable)
 137                         MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE);
 138                 else
 139                         MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE);
 140                 break;
 141         case 1:
 142                 if (enable)
 143                         MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_CELL_ENABLE);
 144                 else
 145                         MACIO_BIC(KEYLARGO_FCR1, KL1_I2S1_CELL_ENABLE);
 146                 break;
 147         default:
 148                 return -ENODEV;
 149         }
 150         return 0;
 151 }
 152
 153 int i2sbus_control_clock(struct i2sbus_control *c,
 154                          struct i2sbus_dev *i2sdev,
 155                          int enable)
 156 {
 157         struct pmf_args args = { .count = 0 };
 158         struct macio_chip *macio = c->macio;
 159
 160         switch (enable) {
 161         case 0:
 162                 if (i2sdev->clock_disable)
 163                         return pmf_call_one(i2sdev->clock_disable, &args);
 164                 break;
 165         case 1:
 166                 if (i2sdev->clock_enable)
 167                         return pmf_call_one(i2sdev->clock_enable, &args);
 168                 break;
 169         default:
 170                 printk(KERN_ERR "i2sbus: INVALID CLOCK ENABLE VALUE\n");
 171                 return -ENODEV;
 172         }
 173
 174         if (macio == NULL || macio->base == NULL)
 175                 return -ENODEV;
 176
 177         switch (i2sdev->bus_number) {
 178         case 0:
 179                 if (enable)
 180                         MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT);
 181                 else
 182                         MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT);
 183                 break;
 184         case 1:
 185                 if (enable)
 186                         MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_CLK_ENABLE_BIT);
 187                 else
 188                         MACIO_BIC(KEYLARGO_FCR1, KL1_I2S1_CLK_ENABLE_BIT);
 189                 break;
 190         default:
 191                 return -ENODEV;
 192         }
 193         return 0;
 194 }