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/*
* i2sbus driver -- bus control routines
*
* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
*
* GPL v2, can be found in COPYING.
*/
#include <asm/io.h>
#include <linux/delay.h>
#include <asm/prom.h>
#include <asm/macio.h>
#include <asm/pmac_feature.h>
#include <asm/pmac_pfunc.h>
#include "i2sbus.h"
int i2sbus_control_init(struct macio_dev* dev, struct i2sbus_control **c)
{
*c = kzalloc(sizeof(struct i2sbus_control), GFP_KERNEL);
if (!*c)
return -ENOMEM;
INIT_LIST_HEAD(&(*c)->list);
if (of_address_to_resource(dev->ofdev.node, 0, &(*c)->rsrc))
goto err;
/* we really should be using feature calls instead of mapping
* these registers. It's safe for now since no one else is
* touching them... */
(*c)->controlregs = ioremap((*c)->rsrc.start,
sizeof(struct i2s_control_regs));
if (!(*c)->controlregs)
goto err;
return 0;
err:
kfree(*c);
*c = NULL;
return -ENODEV;
}
void i2sbus_control_destroy(struct i2sbus_control *c)
{
iounmap(c->controlregs);
kfree(c);
}
/* this is serialised externally */
int i2sbus_control_add_dev(struct i2sbus_control *c,
struct i2sbus_dev *i2sdev)
{
struct device_node *np;
np = i2sdev->sound.ofdev.node;
i2sdev->enable = pmf_find_function(np, "enable");
i2sdev->cell_enable = pmf_find_function(np, "cell-enable");
i2sdev->clock_enable = pmf_find_function(np, "clock-enable");
i2sdev->cell_disable = pmf_find_function(np, "cell-disable");
i2sdev->clock_disable = pmf_find_function(np, "clock-disable");
/* if the bus number is not 0 or 1 we absolutely need to use
* the platform functions -- there's nothing in Darwin that
* would allow seeing a system behind what the FCRs are then,
* and I don't want to go parsing a bunch of platform functions
* by hand to try finding a system... */
if (i2sdev->bus_number != 0 && i2sdev->bus_number != 1 &&
(!i2sdev->enable ||
!i2sdev->cell_enable || !i2sdev->clock_enable ||
!i2sdev->cell_disable || !i2sdev->clock_disable)) {
pmf_put_function(i2sdev->enable);
pmf_put_function(i2sdev->cell_enable);
pmf_put_function(i2sdev->clock_enable);
pmf_put_function(i2sdev->cell_disable);
pmf_put_function(i2sdev->clock_disable);
return -ENODEV;
}
list_add(&i2sdev->item, &c->list);
return 0;
}
void i2sbus_control_remove_dev(struct i2sbus_control *c,
struct i2sbus_dev *i2sdev)
{
/* this is serialised externally */
list_del(&i2sdev->item);
if (list_empty(&c->list))
i2sbus_control_destroy(c);
}
int i2sbus_control_enable(struct i2sbus_control *c,
struct i2sbus_dev *i2sdev)
{
struct pmf_args args = { .count = 0 };
int cc;
if (i2sdev->enable)
return pmf_call_one(i2sdev->enable, &args);
switch (i2sdev->bus_number) {
case 0:
cc = in_le32(&c->controlregs->cell_control);
out_le32(&c->controlregs->cell_control, cc | CTRL_CLOCK_INTF_0_ENABLE);
break;
case 1:
cc = in_le32(&c->controlregs->cell_control);
out_le32(&c->controlregs->cell_control, cc | CTRL_CLOCK_INTF_1_ENABLE);
break;
default:
return -ENODEV;
}
return 0;
}
int i2sbus_control_cell(struct i2sbus_control *c,
struct i2sbus_dev *i2sdev,
int enable)
{
struct pmf_args args = { .count = 0 };
int cc;
switch (enable) {
case 0:
if (i2sdev->cell_disable)
return pmf_call_one(i2sdev->cell_disable, &args);
break;
case 1:
if (i2sdev->cell_enable)
return pmf_call_one(i2sdev->cell_enable, &args);
break;
default:
printk(KERN_ERR "i2sbus: INVALID CELL ENABLE VALUE\n");
return -ENODEV;
}
switch (i2sdev->bus_number) {
case 0:
cc = in_le32(&c->controlregs->cell_control);
cc &= ~CTRL_CLOCK_CELL_0_ENABLE;
cc |= enable * CTRL_CLOCK_CELL_0_ENABLE;
out_le32(&c->controlregs->cell_control, cc);
break;
case 1:
cc = in_le32(&c->controlregs->cell_control);
cc &= ~CTRL_CLOCK_CELL_1_ENABLE;
cc |= enable * CTRL_CLOCK_CELL_1_ENABLE;
out_le32(&c->controlregs->cell_control, cc);
break;
default:
return -ENODEV;
}
return 0;
}
int i2sbus_control_clock(struct i2sbus_control *c,
struct i2sbus_dev *i2sdev,
int enable)
{
struct pmf_args args = { .count = 0 };
int cc;
switch (enable) {
case 0:
if (i2sdev->clock_disable)
return pmf_call_one(i2sdev->clock_disable, &args);
break;
case 1:
if (i2sdev->clock_enable)
return pmf_call_one(i2sdev->clock_enable, &args);
break;
default:
printk(KERN_ERR "i2sbus: INVALID CLOCK ENABLE VALUE\n");
return -ENODEV;
}
switch (i2sdev->bus_number) {
case 0:
cc = in_le32(&c->controlregs->cell_control);
cc &= ~CTRL_CLOCK_CLOCK_0_ENABLE;
cc |= enable * CTRL_CLOCK_CLOCK_0_ENABLE;
out_le32(&c->controlregs->cell_control, cc);
break;
case 1:
cc = in_le32(&c->controlregs->cell_control);
cc &= ~CTRL_CLOCK_CLOCK_1_ENABLE;
cc |= enable * CTRL_CLOCK_CLOCK_1_ENABLE;
out_le32(&c->controlregs->cell_control, cc);
break;
default:
return -ENODEV;
}
return 0;
}
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