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/* $Id: sbus.c,v 1.95.2.3 2002/01/05 01:12:31 davem Exp $
* sbus.c: SBus support routines.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/config.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <asm/system.h>
#include <asm/sbus.h>
#include <asm/dma.h>
#include <asm/oplib.h>
#include <asm/bpp.h>
#include <asm/irq.h>
struct sbus_bus *sbus_root = NULL;
static struct linux_prom_irqs irqs[PROMINTR_MAX] __initdata = { { 0 } };
/* Perhaps when I figure out more about the iommu we'll put a
* device registration routine here that probe_sbus() calls to
* setup the iommu for each Sbus.
*/
/* We call this for each SBus device, and fill the structure based
* upon the prom device tree. We return the start of memory after
* the things we have allocated.
*/
/* #define DEBUG_FILL */
static void __init fill_sbus_device(int prom_node, struct sbus_dev *sdev)
{
unsigned long address, base;
int len;
sdev->prom_node = prom_node;
prom_getstring(prom_node, "name",
sdev->prom_name, sizeof(sdev->prom_name));
address = prom_getint(prom_node, "address");
len = prom_getproperty(prom_node, "reg",
(char *) sdev->reg_addrs,
sizeof(sdev->reg_addrs));
if (len == -1) {
sdev->num_registers = 0;
goto no_regs;
}
if (len % sizeof(struct linux_prom_registers)) {
prom_printf("fill_sbus_device: proplen for regs of %s "
" was %d, need multiple of %d\n",
sdev->prom_name, len,
(int) sizeof(struct linux_prom_registers));
prom_halt();
}
if (len > (sizeof(struct linux_prom_registers) * PROMREG_MAX)) {
prom_printf("fill_sbus_device: Too many register properties "
"for device %s, len=%d\n",
sdev->prom_name, len);
prom_halt();
}
sdev->num_registers = len / sizeof(struct linux_prom_registers);
sdev->ranges_applied = 0;
base = (unsigned long) sdev->reg_addrs[0].phys_addr;
/* Compute the slot number. */
if (base >= SUN_SBUS_BVADDR && sparc_cpu_model == sun4m) {
sdev->slot = sbus_dev_slot(base);
} else {
sdev->slot = sdev->reg_addrs[0].which_io;
}
no_regs:
len = prom_getproperty(prom_node, "ranges",
(char *)sdev->device_ranges,
sizeof(sdev->device_ranges));
if (len == -1) {
sdev->num_device_ranges = 0;
goto no_ranges;
}
if (len % sizeof(struct linux_prom_ranges)) {
prom_printf("fill_sbus_device: proplen for ranges of %s "
" was %d, need multiple of %d\n",
sdev->prom_name, len,
(int) sizeof(struct linux_prom_ranges));
prom_halt();
}
if (len > (sizeof(struct linux_prom_ranges) * PROMREG_MAX)) {
prom_printf("fill_sbus_device: Too many range properties "
"for device %s, len=%d\n",
sdev->prom_name, len);
prom_halt();
}
sdev->num_device_ranges =
len / sizeof(struct linux_prom_ranges);
no_ranges:
/* XXX Unfortunately, IRQ issues are very arch specific.
* XXX Pull this crud out into an arch specific area
* XXX at some point. -DaveM
*/
#ifdef __sparc_v9__
len = prom_getproperty(prom_node, "interrupts",
(char *) irqs, sizeof(irqs));
if (len == -1 || len == 0) {
sdev->irqs[0] = 0;
sdev->num_irqs = 0;
} else {
unsigned int pri = irqs[0].pri;
sdev->num_irqs = 1;
if (pri < 0x20)
pri += sdev->slot * 8;
sdev->irqs[0] = sbus_build_irq(sdev->bus, pri);
}
#else
len = prom_getproperty(prom_node, "intr",
(char *)irqs, sizeof(irqs));
if (len == -1)
len = 0;
sdev->num_irqs = len / 8;
if (sdev->num_irqs == 0) {
sdev->irqs[0] = 0;
} else if (sparc_cpu_model == sun4d) {
extern unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq);
for (len = 0; len < sdev->num_irqs; len++)
sdev->irqs[len] = sun4d_build_irq(sdev, irqs[len].pri);
} else {
for (len = 0; len < sdev->num_irqs; len++)
sdev->irqs[len] = irqs[len].pri;
}
#endif /* !__sparc_v9__ */
}
/* This routine gets called from whoever needs the sbus first, to scan
* the SBus device tree. Currently it just prints out the devices
* found on the bus and builds trees of SBUS structs and attached
* devices.
*/
extern void iommu_init(int iommu_node, struct sbus_bus *sbus);
extern void iounit_init(int sbi_node, int iounit_node, struct sbus_bus *sbus);
void sun4_init(void);
#ifdef CONFIG_SUN_AUXIO
extern void auxio_probe(void);
#endif
static void __init sbus_do_child_siblings(int start_node,
struct sbus_dev *child,
struct sbus_dev *parent,
struct sbus_bus *sbus)
{
struct sbus_dev *this_dev = child;
int this_node = start_node;
/* Child already filled in, just need to traverse siblings. */
child->child = NULL;
child->parent = parent;
while((this_node = prom_getsibling(this_node)) != 0) {
this_dev->next = kmalloc(sizeof(struct sbus_dev), GFP_ATOMIC);
this_dev = this_dev->next;
this_dev->next = 0;
this_dev->parent = parent;
this_dev->bus = sbus;
fill_sbus_device(this_node, this_dev);
if(prom_getchild(this_node)) {
this_dev->child = kmalloc(sizeof(struct sbus_dev),
GFP_ATOMIC);
this_dev->child->bus = sbus;
this_dev->child->next = 0;
fill_sbus_device(prom_getchild(this_node), this_dev->child);
sbus_do_child_siblings(prom_getchild(this_node),
this_dev->child, this_dev, sbus);
} else {
this_dev->child = NULL;
}
}
}
/*
* XXX This functions appears to be a distorted version of
* prom_sbus_ranges_init(), with all sun4d stuff cut away.
* Ask DaveM what is going on here, how is sun4d supposed to work... XXX
*/
static void __init sbus_bus_ranges_init(int parent_node, struct sbus_bus *sbus)
{
int len;
len = prom_getproperty(sbus->prom_node, "ranges",
(char *) sbus->sbus_ranges,
sizeof(sbus->sbus_ranges));
if (len == -1 || len == 0) {
sbus->num_sbus_ranges = 0;
return;
}
sbus->num_sbus_ranges = len / sizeof(struct linux_prom_ranges);
}
static void __init __apply_ranges_to_regs(struct linux_prom_ranges *ranges,
int num_ranges,
struct linux_prom_registers *regs,
int num_regs)
{
if (num_ranges) {
int regnum;
for (regnum = 0; regnum < num_regs; regnum++) {
int rngnum;
for (rngnum = 0; rngnum < num_ranges; rngnum++) {
if (regs[regnum].which_io == ranges[rngnum].ot_child_space)
break;
}
if (rngnum == num_ranges) {
/* We used to flag this as an error. Actually
* some devices do not report the regs as we expect.
* For example, see SUNW,pln device. In that case
* the reg property is in a format internal to that
* node, ie. it is not in the SBUS register space
* per se. -DaveM
*/
return;
}
regs[regnum].which_io = ranges[rngnum].ot_parent_space;
regs[regnum].phys_addr -= ranges[rngnum].ot_child_base;
regs[regnum].phys_addr += ranges[rngnum].ot_parent_base;
}
}
}
static void __init __fixup_regs_sdev(struct sbus_dev *sdev)
{
if (sdev->num_registers != 0) {
struct sbus_dev *parent = sdev->parent;
int i;
while (parent != NULL) {
__apply_ranges_to_regs(parent->device_ranges,
parent->num_device_ranges,
sdev->reg_addrs,
sdev->num_registers);
parent = parent->parent;
}
__apply_ranges_to_regs(sdev->bus->sbus_ranges,
sdev->bus->num_sbus_ranges,
sdev->reg_addrs,
sdev->num_registers);
for (i = 0; i < sdev->num_registers; i++) {
struct resource *res = &sdev->resource[i];
res->start = sdev->reg_addrs[i].phys_addr;
res->end = (res->start +
(unsigned long)sdev->reg_addrs[i].reg_size - 1UL);
res->flags = IORESOURCE_IO |
(sdev->reg_addrs[i].which_io & 0xff);
}
}
}
static void __init sbus_fixup_all_regs(struct sbus_dev *first_sdev)
{
struct sbus_dev *sdev;
for (sdev = first_sdev; sdev; sdev = sdev->next) {
if (sdev->child)
sbus_fixup_all_regs(sdev->child);
__fixup_regs_sdev(sdev);
}
}
extern void register_proc_sparc_ioport(void);
extern void firetruck_init(void);
extern void rs_init(void);
void __init sbus_init(void)
{
int nd, this_sbus, sbus_devs, topnd, iommund;
unsigned int sbus_clock;
struct sbus_bus *sbus;
struct sbus_dev *this_dev;
int num_sbus = 0; /* How many did we find? */
#ifndef __sparc_v9__
register_proc_sparc_ioport();
#endif
#ifdef CONFIG_SUN4
return sun4_dvma_init();
#endif
topnd = prom_getchild(prom_root_node);
/* Finding the first sbus is a special case... */
iommund = 0;
if(sparc_cpu_model == sun4u) {
nd = prom_searchsiblings(topnd, "sbus");
if(nd == 0) {
#ifdef CONFIG_PCI
if (!pcibios_present()) {
prom_printf("Neither SBUS nor PCI found.\n");
prom_halt();
} else {
#ifdef __sparc_v9__
firetruck_init();
#endif
}
return;
#else
prom_printf("YEEE, UltraSparc sbus not found\n");
prom_halt();
#endif
}
} else if(sparc_cpu_model == sun4d) {
if((iommund = prom_searchsiblings(topnd, "io-unit")) == 0 ||
(nd = prom_getchild(iommund)) == 0 ||
(nd = prom_searchsiblings(nd, "sbi")) == 0) {
panic("sbi not found");
}
} else if((nd = prom_searchsiblings(topnd, "sbus")) == 0) {
if((iommund = prom_searchsiblings(topnd, "iommu")) == 0 ||
(nd = prom_getchild(iommund)) == 0 ||
(nd = prom_searchsiblings(nd, "sbus")) == 0) {
#ifdef CONFIG_PCI
if (!pcibios_present()) {
prom_printf("Neither SBUS nor PCI found.\n");
prom_halt();
}
return;
#else
/* No reason to run further - the data access trap will occur. */
panic("sbus not found");
#endif
}
}
/* Ok, we've found the first one, allocate first SBus struct
* and place in chain.
*/
sbus = sbus_root = kmalloc(sizeof(struct sbus_bus), GFP_ATOMIC);
sbus->next = NULL;
sbus->prom_node = nd;
this_sbus = nd;
if(iommund && sparc_cpu_model != sun4u && sparc_cpu_model != sun4d)
iommu_init(iommund, sbus);
/* Loop until we find no more SBUS's */
while(this_sbus) {
#ifdef __sparc_v9__
/* IOMMU hides inside SBUS/SYSIO prom node on Ultra. */
if(sparc_cpu_model == sun4u) {
extern void sbus_iommu_init(int prom_node, struct sbus_bus *sbus);
sbus_iommu_init(this_sbus, sbus);
}
#endif
#ifndef __sparc_v9__
if (sparc_cpu_model == sun4d)
iounit_init(this_sbus, iommund, sbus);
#endif
printk("sbus%d: ", num_sbus);
sbus_clock = prom_getint(this_sbus, "clock-frequency");
if(sbus_clock == -1)
sbus_clock = (25*1000*1000);
printk("Clock %d.%d MHz\n", (int) ((sbus_clock/1000)/1000),
(int) (((sbus_clock/1000)%1000 != 0) ?
(((sbus_clock/1000)%1000) + 1000) : 0));
prom_getstring(this_sbus, "name",
sbus->prom_name, sizeof(sbus->prom_name));
sbus->clock_freq = sbus_clock;
#ifndef __sparc_v9__
if (sparc_cpu_model == sun4d) {
sbus->devid = prom_getint(iommund, "device-id");
sbus->board = prom_getint(iommund, "board#");
}
#endif
sbus_bus_ranges_init(iommund, sbus);
sbus_devs = prom_getchild(this_sbus);
sbus->devices = kmalloc(sizeof(struct sbus_dev), GFP_ATOMIC);
this_dev = sbus->devices;
this_dev->next = NULL;
this_dev->bus = sbus;
this_dev->parent = NULL;
fill_sbus_device(sbus_devs, this_dev);
/* Should we traverse for children? */
if(prom_getchild(sbus_devs)) {
/* Allocate device node */
this_dev->child = kmalloc(sizeof(struct sbus_dev),
GFP_ATOMIC);
/* Fill it */
this_dev->child->bus = sbus;
this_dev->child->next = 0;
fill_sbus_device(prom_getchild(sbus_devs),
this_dev->child);
sbus_do_child_siblings(prom_getchild(sbus_devs),
this_dev->child,
this_dev,
sbus);
} else {
this_dev->child = NULL;
}
while((sbus_devs = prom_getsibling(sbus_devs)) != 0) {
/* Allocate device node */
this_dev->next = kmalloc(sizeof(struct sbus_dev),
GFP_ATOMIC);
this_dev = this_dev->next;
this_dev->next = NULL;
/* Fill it */
this_dev->bus = sbus;
this_dev->parent = NULL;
fill_sbus_device(sbus_devs, this_dev);
/* Is there a child node hanging off of us? */
if(prom_getchild(sbus_devs)) {
/* Get new device struct */
this_dev->child = kmalloc(sizeof(struct sbus_dev),
GFP_ATOMIC);
/* Fill it */
this_dev->child->bus = sbus;
this_dev->child->next = 0;
fill_sbus_device(prom_getchild(sbus_devs),
this_dev->child);
sbus_do_child_siblings(prom_getchild(sbus_devs),
this_dev->child,
this_dev,
sbus);
} else {
this_dev->child = NULL;
}
}
/* Walk all devices and apply parent ranges. */
sbus_fixup_all_regs(sbus->devices);
dvma_init(sbus);
num_sbus++;
if(sparc_cpu_model == sun4u) {
this_sbus = prom_getsibling(this_sbus);
if(!this_sbus)
break;
this_sbus = prom_searchsiblings(this_sbus, "sbus");
} else if(sparc_cpu_model == sun4d) {
iommund = prom_getsibling(iommund);
if(!iommund)
break;
iommund = prom_searchsiblings(iommund, "io-unit");
if(!iommund)
break;
this_sbus = prom_searchsiblings(prom_getchild(iommund), "sbi");
} else {
this_sbus = prom_getsibling(this_sbus);
if(!this_sbus)
break;
this_sbus = prom_searchsiblings(this_sbus, "sbus");
}
if(this_sbus) {
sbus->next = kmalloc(sizeof(struct sbus_bus), GFP_ATOMIC);
sbus = sbus->next;
sbus->next = NULL;
sbus->prom_node = this_sbus;
} else {
break;
}
} /* while(this_sbus) */
if (sparc_cpu_model == sun4d) {
extern void sun4d_init_sbi_irq(void);
sun4d_init_sbi_irq();
}
rs_init();
#ifdef __sparc_v9__
if (sparc_cpu_model == sun4u) {
firetruck_init();
}
#endif
#ifdef CONFIG_SUN_AUXIO
if (sparc_cpu_model == sun4u)
auxio_probe ();
#endif
#ifdef __sparc_v9__
if (sparc_cpu_model == sun4u) {
extern void clock_probe(void);
clock_probe();
}
#endif
}
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