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/*
* arch/ppc/kernel/feature.c
*
* Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
*
* 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.
*
*/
#include <linux/types.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/errno.h>
#include <asm/ohare.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/feature.h>
#define MAX_FEATURE_REGS 2
#undef DEBUG_FEATURE
static u32 feature_bits_pbook[] = {
0, /* FEATURE_null */
OH_SCC_RESET, /* FEATURE_Serial_reset */
OH_SCC_ENABLE, /* FEATURE_Serial_enable */
OH_SCCA_IO, /* FEATURE_Serial_IO_A */
OH_SCCB_IO, /* FEATURE_Serial_IO_B */
OH_FLOPPY_ENABLE, /* FEATURE_SWIM3_enable */
OH_MESH_ENABLE, /* FEATURE_MESH_enable */
OH_IDE_ENABLE, /* FEATURE_IDE_enable */
OH_VIA_ENABLE, /* FEATURE_VIA_enable */
OH_IDECD_POWER, /* FEATURE_CD_power */
OH_BAY_RESET, /* FEATURE_Mediabay_reset */
OH_BAY_ENABLE, /* FEATURE_Mediabay_enable */
OH_BAY_PCI_ENABLE, /* FEATURE_Mediabay_PCI_enable */
OH_BAY_IDE_ENABLE, /* FEATURE_Mediabay_IDE_enable */
OH_BAY_FLOPPY_ENABLE, /* FEATURE_Mediabay_floppy_enable */
0, /* FEATURE_BMac_reset */
0, /* FEATURE_BMac_IO_enable */
0 /* FEATURE_Modem_Reset -> guess...*/
};
/* assume these are the same as the ohare until proven otherwise */
static u32 feature_bits_heathrow[] = {
0, /* FEATURE_null */
OH_SCC_RESET, /* FEATURE_Serial_reset */
OH_SCC_ENABLE, /* FEATURE_Serial_enable */
OH_SCCA_IO, /* FEATURE_Serial_IO_A */
OH_SCCB_IO, /* FEATURE_Serial_IO_B */
OH_FLOPPY_ENABLE, /* FEATURE_SWIM3_enable */
OH_MESH_ENABLE, /* FEATURE_MESH_enable */
OH_IDE_ENABLE, /* FEATURE_IDE_enable */
OH_VIA_ENABLE, /* FEATURE_VIA_enable */
OH_IDECD_POWER, /* FEATURE_CD_power */
OH_BAY_RESET, /* FEATURE_Mediabay_reset */
OH_BAY_ENABLE, /* FEATURE_Mediabay_enable */
OH_BAY_PCI_ENABLE, /* FEATURE_Mediabay_PCI_enable */
OH_BAY_IDE_ENABLE, /* FEATURE_Mediabay_IDE_enable */
OH_BAY_FLOPPY_ENABLE, /* FEATURE_Mediabay_floppy_enable */
0x80000000, /* FEATURE_BMac_reset */
0x60000000, /* FEATURE_BMac_IO_enable */
0x02000000 /* FEATURE_Modem_Reset -> guess...*/
};
/* definition of a feature controller object */
struct feature_controller
{
u32* bits;
volatile u32* reg;
struct device_node* device;
};
/* static functions */
static void
feature_add_controller(struct device_node *controller_device, u32* bits);
static int
feature_lookup_controller(struct device_node *device);
/* static varialbles */
static struct feature_controller controllers[MAX_FEATURE_REGS];
static int controller_count = 0;
void
feature_init(void)
{
struct device_node *np;
np = find_devices("mac-io");
while (np != NULL)
{
feature_add_controller(np, feature_bits_heathrow);
np = np->next;
}
if (controller_count == 0)
{
np = find_devices("ohare");
if (np)
{
if (find_devices("via-pmu") != NULL)
feature_add_controller(np, feature_bits_pbook);
else
/* else not sure; maybe this is a Starmax? */
feature_add_controller(np, NULL);
}
}
if (controller_count)
printk(KERN_INFO "Registered %d feature controller(s)\n", controller_count);
}
static void
feature_add_controller(struct device_node *controller_device, u32* bits)
{
struct feature_controller* controller;
if (controller_count >= MAX_FEATURE_REGS)
{
printk(KERN_INFO "Feature controller %s skipped(MAX:%d)\n",
controller_device->full_name, MAX_FEATURE_REGS);
return;
}
controller = &controllers[controller_count];
controller->bits = bits;
controller->device = controller_device;
if (controller_device->n_addrs == 0) {
printk(KERN_ERR "No addresses for %s\n",
controller_device->full_name);
return;
}
controller->reg = (volatile u32 *)ioremap(
controller_device->addrs[0].address + OHARE_FEATURE_REG, 4);
if (bits == NULL) {
printk(KERN_INFO "Twiddling the magic ohare bits\n");
out_le32(controller->reg, STARMAX_FEATURES);
return;
}
controller_count++;
}
static int
feature_lookup_controller(struct device_node *device)
{
int i;
if (device == NULL)
return -EINVAL;
while(device)
{
for (i=0; i<controller_count; i++)
if (device == controllers[i].device)
return i;
device = device->parent;
}
#ifdef DEBUG_FEATURE
printk("feature: <%s> not found on any controller\n",
device->name);
#endif
return -ENODEV;
}
int
feature_set(struct device_node* device, enum system_feature f)
{
int controller;
unsigned long flags;
if (f >= FEATURE_last)
return -EINVAL;
controller = feature_lookup_controller(device);
if (controller < 0)
return controller;
#ifdef DEBUG_FEATURE
printk("feature: <%s> setting feature %d in controller @0x%x\n",
device->name, (int)f, (unsigned int)controllers[controller].reg);
#endif
save_flags(flags);
cli();
st_le32( controllers[controller].reg,
ld_le32(controllers[controller].reg) |
controllers[controller].bits[f]);
restore_flags(flags);
udelay(10);
return 0;
}
int
feature_clear(struct device_node* device, enum system_feature f)
{
int controller;
unsigned long flags;
if (f >= FEATURE_last)
return -EINVAL;
controller = feature_lookup_controller(device);
if (controller < 0)
return controller;
#ifdef DEBUG_FEATURE
printk("feature: <%s> clearing feature %d in controller @0x%x\n",
device->name, (int)f, (unsigned int)controllers[controller].reg);
#endif
save_flags(flags);
cli();
st_le32( controllers[controller].reg,
ld_le32(controllers[controller].reg) &
~(controllers[controller].bits[f]));
restore_flags(flags);
udelay(10);
return 0;
}
int
feature_test(struct device_node* device, enum system_feature f)
{
int controller;
if (f >= FEATURE_last)
return -EINVAL;
controller = feature_lookup_controller(device);
if (controller < 0)
return controller;
return (ld_le32(controllers[controller].reg) &
controllers[controller].bits[f]) != 0;
}
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