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Linux/sound/aoa/soundbus/i2sbus/control.c

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  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 #include <linux/io.h>
 13 
 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 }
195 

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