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* Driver for the media bay on the PowerBook 3400 and 2400.
*
* Copyright (C) 1998 Paul Mackerras.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#define __KERNEL_SYSCALLS__
#include <linux/config.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/hdreg.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <asm/prom.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/feature.h>
#include <asm/mediabay.h>
#include <asm/init.h>
#undef MB_USE_INTERRUPTS
struct media_bay_hw {
unsigned char b0;
unsigned char contents;
unsigned char b2;
unsigned char b3;
};
struct media_bay_info {
volatile struct media_bay_hw* addr;
int content_id;
int previous_id;
int ready;
int last_value;
int value_count;
int reset_timer;
struct device_node* dev_node;
#ifdef CONFIG_BLK_DEV_IDE
unsigned long cd_base;
int cd_index;
int cd_irq;
int cd_timer;
#endif
};
#define MAX_BAYS 2
static volatile struct media_bay_info media_bays[MAX_BAYS];
int media_bay_count = 0;
#define MB_CONTENTS(i) ((in_8(&media_bays[i].addr->contents) >> 4) & 7)
#ifdef CONFIG_BLK_DEV_IDE
/* check the busy bit in the media-bay ide interface
(assumes the media-bay contains an ide device) */
#define MB_IDE_READY(i) ((in_8((volatile unsigned char *) \
(media_bays[i].cd_base + 0x70)) & 0x80) == 0)
#endif
/*
* Consider the media-bay ID value stable if it is the same for
* this many consecutive samples (at intervals of 1/HZ seconds).
*/
#define MB_STABLE_COUNT 4
/*
* Hold the media-bay reset signal true for this many ticks
* after a device is inserted before releasing it.
*/
#define MB_RESET_COUNT 20
/*
* Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted
* (or until the device is ready) before registering the IDE interface.
*/
#define MB_IDE_WAIT 1000
static void poll_media_bay(int which);
static void set_media_bay(int which, int id);
static int media_bay_task(void *);
/*
* It seems that the bit for the media-bay interrupt in the IRQ_LEVEL
* register is always set when there is something in the media bay.
* This causes problems for the interrupt code if we attach an interrupt
* handler to the media-bay interrupt, because it tends to go into
* an infinite loop calling the media bay interrupt handler.
* Therefore we do it all by polling the media bay once each tick.
*/
__pmac /* I don't know of any chrp with a mediabay -- Cort */
void
media_bay_init(void)
{
struct device_node *np;
int n,i;
for (i=0; i<MAX_BAYS; i++)
{
memset((char *)&media_bays[i], 0, sizeof(struct media_bay_info));
media_bays[i].content_id = -1;
#ifdef CONFIG_BLK_DEV_IDE
media_bays[i].cd_index = -1;
#endif
}
np = find_devices("media-bay");
n = 0;
while(np && (n<MAX_BAYS))
{
if (np->n_addrs == 0)
continue;
media_bays[n].addr = (volatile struct media_bay_hw *)
ioremap(np->addrs[0].address, sizeof(struct media_bay_hw));
#ifdef MB_USE_INTERRUPTS
if (np->n_intrs == 0)
{
printk(KERN_ERR "media bay %d has no irq\n",n);
continue;
}
if (request_irq(np_intrs[0].line, media_bay_intr, 0, "Media bay", NULL))
{
printk(KERN_ERR "Couldn't get IRQ %d for media bay %d\n", irq, n);
continue;
}
#endif
media_bay_count++;
set_media_bay(n, MB_CONTENTS(n));
if (media_bays[n].content_id != MB_NO) {
feature_clear(media_bays[n].dev_node, FEATURE_Mediabay_reset);
udelay(500);
}
media_bays[n].ready = 1;
media_bays[n].previous_id = media_bays[n].content_id;
media_bays[n].reset_timer = 0;
media_bays[n].dev_node = np;
#ifdef CONFIG_BLK_DEV_IDE
media_bays[n].cd_timer = 0;
#endif
n++;
np=np->next;
}
if (media_bay_count)
{
printk(KERN_INFO "Registered %d media-bay(s)\n", media_bay_count);
kernel_thread(media_bay_task, NULL, 0);
}
}
#if 0
static void
media_bay_intr(int irq, void *devid, struct pt_regs *regs)
{
int id = MB_CONTENTS();
if (id == MB_NO)
set_media_bay(id);
}
#endif
int
check_media_bay(struct device_node *which_bay, int what)
{
#ifdef CONFIG_BLK_DEV_IDE
int i;
for (i=0; i<media_bay_count; i++)
if (which_bay == media_bays[i].dev_node)
{
if ((what == media_bays[i].content_id) && media_bays[i].ready)
return 0;
media_bays[i].cd_index = -1;
return -EINVAL;
}
#endif /* CONFIG_BLK_DEV_IDE */
return -ENODEV;
}
int
check_media_bay_by_base(unsigned long base, int what)
{
#ifdef CONFIG_BLK_DEV_IDE
int i;
for (i=0; i<media_bay_count; i++)
if (base == media_bays[i].cd_base)
{
if ((what == media_bays[i].content_id) && media_bays[i].ready)
return 0;
media_bays[i].cd_index = -1;
return -EINVAL;
}
#endif
return -ENODEV;
}
int
media_bay_set_ide_infos(struct device_node* which_bay, unsigned long base,
int irq, int index)
{
#ifdef CONFIG_BLK_DEV_IDE
int i;
for (i=0; i<media_bay_count; i++)
if (which_bay == media_bays[i].dev_node)
{
media_bays[i].cd_base = base;
media_bays[i].cd_irq = irq;
media_bays[i].cd_index = index;
printk(KERN_DEBUG "Registered ide %d for media bay %d\n", index, i);
return 0;
}
#endif
return -ENODEV;
}
/*
* This procedure runs as a kernel thread to poll the media bay
* once each tick and register and unregister the IDE interface
* with the IDE driver. It needs to be a thread because
* ide_register can't be called from interrupt context.
*/
int
media_bay_task(void *x)
{
volatile struct media_bay_info* bay;
int i = 0;
strcpy(current->comm, "media-bay");
for (;;)
{
bay = &media_bays[i];
poll_media_bay(i);
if (bay->content_id != bay->previous_id) {
bay->reset_timer = (bay->content_id != MB_NO) ?
MB_RESET_COUNT: 0;
bay->ready = 0;
#ifdef CONFIG_BLK_DEV_IDE
bay->cd_timer = 0;
if (bay->content_id != MB_CD && bay->cd_index >= 0) {
printk(KERN_DEBUG "Unregistering mb %d ide, index:%d\n", i, bay->cd_index);
ide_unregister(bay->cd_index);
bay->cd_index = -1;
}
#endif
} else if (bay->reset_timer) {
if (--bay->reset_timer == 0) {
feature_clear(bay->dev_node, FEATURE_Mediabay_reset);
bay->ready = 1;
#ifdef CONFIG_BLK_DEV_IDE
bay->cd_timer = 0;
if (bay->content_id == MB_CD && bay->cd_base != 0)
bay->cd_timer = MB_IDE_WAIT;
#endif
}
#ifdef CONFIG_BLK_DEV_IDE
} else if (bay->cd_timer && (--bay->cd_timer == 0 || MB_IDE_READY(i))
&& bay->cd_index < 0) {
bay->cd_timer = 0;
printk(KERN_DEBUG "Registering IDE, base:0x%08lx, irq:%d\n", bay->cd_base, bay->cd_irq);
printk("\n");
bay->cd_index = ide_register(bay->cd_base, 0, bay->cd_irq);
if (bay->cd_index == -1)
printk("\nCD-ROM badly inserted. Remove it and try again !\n");
else
printk(KERN_DEBUG "media-bay %d is ide %d\n", i, bay->cd_index);
#endif
}
bay->previous_id = bay->content_id;
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(1);
if (signal_pending(current))
return 0;
i = (i+1)%media_bay_count;
}
}
void
poll_media_bay(int which)
{
int id = MB_CONTENTS(which);
if (id == media_bays[which].last_value) {
if (id != media_bays[which].content_id
&& ++media_bays[which].value_count >= MB_STABLE_COUNT)
set_media_bay(which, id);
} else {
media_bays[which].last_value = id;
media_bays[which].value_count = 0;
}
}
static void
set_media_bay(int which, int id)
{
volatile struct media_bay_info* bay;
bay = &media_bays[which];
bay->content_id = id;
bay->last_value = id;
switch (id) {
case MB_CD:
feature_clear(bay->dev_node, FEATURE_Mediabay_floppy_enable);
feature_set(bay->dev_node, FEATURE_Mediabay_enable);
feature_set(bay->dev_node, FEATURE_CD_power);
feature_set(bay->dev_node, FEATURE_Mediabay_IDE_enable);
printk(KERN_INFO "media bay %d contains a CD-ROM drive\n", which);
break;
case MB_FD:
feature_clear(bay->dev_node, FEATURE_CD_power);
feature_set(bay->dev_node, FEATURE_Mediabay_enable);
feature_set(bay->dev_node, FEATURE_Mediabay_floppy_enable);
feature_set(bay->dev_node, FEATURE_SWIM3_enable);
printk(KERN_INFO "media bay %d contains a floppy disk drive\n", which);
break;
case MB_NO:
feature_clear(bay->dev_node, FEATURE_Mediabay_floppy_enable);
feature_clear(bay->dev_node, FEATURE_CD_power);
printk(KERN_INFO "media bay %d is empty\n", which);
break;
default:
feature_clear(bay->dev_node, FEATURE_Mediabay_floppy_enable);
feature_clear(bay->dev_node, FEATURE_CD_power);
feature_set(bay->dev_node, FEATURE_Mediabay_enable);
printk(KERN_INFO "media bay %d contains an unknown device (%d)\n",
which, id);
break;
}
udelay(500);
}
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