1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
329 lines
7.7 KiB
C
329 lines
7.7 KiB
C
#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <asm/oplib.h>
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#include <asm/isa.h>
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struct sparc_isa_bridge *isa_chain;
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static void __init fatal_err(const char *reason)
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{
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prom_printf("ISA: fatal error, %s.\n", reason);
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}
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static void __init report_dev(struct sparc_isa_device *isa_dev, int child)
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{
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if (child)
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printk(" (%s)", isa_dev->prom_name);
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else
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printk(" [%s", isa_dev->prom_name);
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}
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static void __init isa_dev_get_resource(struct sparc_isa_device *isa_dev,
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struct linux_prom_registers *pregs,
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int pregs_size)
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{
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unsigned long base, len;
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int prop_len;
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prop_len = prom_getproperty(isa_dev->prom_node, "reg",
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(char *) pregs, pregs_size);
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if (prop_len <= 0)
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return;
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/* Only the first one is interesting. */
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len = pregs[0].reg_size;
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base = (((unsigned long)pregs[0].which_io << 32) |
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(unsigned long)pregs[0].phys_addr);
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base += isa_dev->bus->parent->io_space.start;
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isa_dev->resource.start = base;
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isa_dev->resource.end = (base + len - 1UL);
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isa_dev->resource.flags = IORESOURCE_IO;
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isa_dev->resource.name = isa_dev->prom_name;
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request_resource(&isa_dev->bus->parent->io_space,
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&isa_dev->resource);
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}
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/* I can't believe they didn't put a real INO in the isa device
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* interrupts property. The whole point of the OBP properties
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* is to shield the kernel from IRQ routing details.
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*
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* The P1275 standard for ISA devices seems to also have been
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* totally ignored.
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*
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* On later systems, an interrupt-map and interrupt-map-mask scheme
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* akin to EBUS is used.
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*/
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static struct {
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int obp_irq;
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int pci_ino;
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} grover_irq_table[] = {
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{ 1, 0x00 }, /* dma, unknown ino at this point */
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{ 2, 0x27 }, /* floppy */
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{ 3, 0x22 }, /* parallel */
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{ 4, 0x2b }, /* serial */
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{ 5, 0x25 }, /* acpi power management */
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{ 0, 0x00 } /* end of table */
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};
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static int __init isa_dev_get_irq_using_imap(struct sparc_isa_device *isa_dev,
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struct sparc_isa_bridge *isa_br,
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int *interrupt,
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struct linux_prom_registers *pregs)
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{
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unsigned int hi, lo, irq;
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int i;
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hi = pregs->which_io & isa_br->isa_intmask.phys_hi;
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lo = pregs->phys_addr & isa_br->isa_intmask.phys_lo;
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irq = *interrupt & isa_br->isa_intmask.interrupt;
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for (i = 0; i < isa_br->num_isa_intmap; i++) {
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if ((isa_br->isa_intmap[i].phys_hi == hi) &&
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(isa_br->isa_intmap[i].phys_lo == lo) &&
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(isa_br->isa_intmap[i].interrupt == irq)) {
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*interrupt = isa_br->isa_intmap[i].cinterrupt;
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return 0;
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}
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}
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return -1;
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}
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static void __init isa_dev_get_irq(struct sparc_isa_device *isa_dev,
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struct linux_prom_registers *pregs)
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{
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int irq_prop;
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irq_prop = prom_getintdefault(isa_dev->prom_node,
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"interrupts", -1);
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if (irq_prop <= 0) {
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goto no_irq;
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} else {
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struct pci_controller_info *pcic;
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struct pci_pbm_info *pbm;
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int i;
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if (isa_dev->bus->num_isa_intmap) {
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if (!isa_dev_get_irq_using_imap(isa_dev,
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isa_dev->bus,
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&irq_prop,
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pregs))
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goto route_irq;
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}
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for (i = 0; grover_irq_table[i].obp_irq != 0; i++) {
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if (grover_irq_table[i].obp_irq == irq_prop) {
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int ino = grover_irq_table[i].pci_ino;
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if (ino == 0)
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goto no_irq;
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irq_prop = ino;
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goto route_irq;
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}
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}
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goto no_irq;
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route_irq:
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pbm = isa_dev->bus->parent;
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pcic = pbm->parent;
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isa_dev->irq = pcic->irq_build(pbm, NULL, irq_prop);
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return;
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}
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no_irq:
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isa_dev->irq = PCI_IRQ_NONE;
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}
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static void __init isa_fill_children(struct sparc_isa_device *parent_isa_dev)
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{
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int node = prom_getchild(parent_isa_dev->prom_node);
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if (node == 0)
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return;
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printk(" ->");
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while (node != 0) {
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struct linux_prom_registers regs[PROMREG_MAX];
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struct sparc_isa_device *isa_dev;
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int prop_len;
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isa_dev = kmalloc(sizeof(*isa_dev), GFP_KERNEL);
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if (!isa_dev) {
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fatal_err("cannot allocate child isa_dev");
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prom_halt();
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}
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memset(isa_dev, 0, sizeof(*isa_dev));
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/* Link it in to parent. */
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isa_dev->next = parent_isa_dev->child;
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parent_isa_dev->child = isa_dev;
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isa_dev->bus = parent_isa_dev->bus;
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isa_dev->prom_node = node;
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prop_len = prom_getproperty(node, "name",
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(char *) isa_dev->prom_name,
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sizeof(isa_dev->prom_name));
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if (prop_len <= 0) {
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fatal_err("cannot get child isa_dev OBP node name");
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prom_halt();
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}
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prop_len = prom_getproperty(node, "compatible",
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(char *) isa_dev->compatible,
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sizeof(isa_dev->compatible));
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/* Not having this is OK. */
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if (prop_len <= 0)
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isa_dev->compatible[0] = '\0';
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isa_dev_get_resource(isa_dev, regs, sizeof(regs));
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isa_dev_get_irq(isa_dev, regs);
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report_dev(isa_dev, 1);
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node = prom_getsibling(node);
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}
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}
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static void __init isa_fill_devices(struct sparc_isa_bridge *isa_br)
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{
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int node = prom_getchild(isa_br->prom_node);
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while (node != 0) {
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struct linux_prom_registers regs[PROMREG_MAX];
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struct sparc_isa_device *isa_dev;
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int prop_len;
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isa_dev = kmalloc(sizeof(*isa_dev), GFP_KERNEL);
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if (!isa_dev) {
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fatal_err("cannot allocate isa_dev");
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prom_halt();
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}
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memset(isa_dev, 0, sizeof(*isa_dev));
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/* Link it in. */
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isa_dev->next = NULL;
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if (isa_br->devices == NULL) {
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isa_br->devices = isa_dev;
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} else {
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struct sparc_isa_device *tmp = isa_br->devices;
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while (tmp->next)
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tmp = tmp->next;
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tmp->next = isa_dev;
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}
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isa_dev->bus = isa_br;
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isa_dev->prom_node = node;
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prop_len = prom_getproperty(node, "name",
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(char *) isa_dev->prom_name,
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sizeof(isa_dev->prom_name));
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if (prop_len <= 0) {
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fatal_err("cannot get isa_dev OBP node name");
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prom_halt();
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}
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prop_len = prom_getproperty(node, "compatible",
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(char *) isa_dev->compatible,
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sizeof(isa_dev->compatible));
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/* Not having this is OK. */
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if (prop_len <= 0)
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isa_dev->compatible[0] = '\0';
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isa_dev_get_resource(isa_dev, regs, sizeof(regs));
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isa_dev_get_irq(isa_dev, regs);
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report_dev(isa_dev, 0);
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isa_fill_children(isa_dev);
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printk("]");
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node = prom_getsibling(node);
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}
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}
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void __init isa_init(void)
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{
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struct pci_dev *pdev;
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unsigned short vendor, device;
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int index = 0;
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vendor = PCI_VENDOR_ID_AL;
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device = PCI_DEVICE_ID_AL_M1533;
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pdev = NULL;
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while ((pdev = pci_get_device(vendor, device, pdev)) != NULL) {
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struct pcidev_cookie *pdev_cookie;
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struct pci_pbm_info *pbm;
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struct sparc_isa_bridge *isa_br;
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int prop_len;
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pdev_cookie = pdev->sysdata;
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if (!pdev_cookie) {
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printk("ISA: Warning, ISA bridge ignored due to "
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"lack of OBP data.\n");
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continue;
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}
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pbm = pdev_cookie->pbm;
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isa_br = kmalloc(sizeof(*isa_br), GFP_KERNEL);
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if (!isa_br) {
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fatal_err("cannot allocate sparc_isa_bridge");
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prom_halt();
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}
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memset(isa_br, 0, sizeof(*isa_br));
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/* Link it in. */
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isa_br->next = isa_chain;
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isa_chain = isa_br;
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isa_br->parent = pbm;
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isa_br->self = pdev;
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isa_br->index = index++;
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isa_br->prom_node = pdev_cookie->prom_node;
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strncpy(isa_br->prom_name, pdev_cookie->prom_name,
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sizeof(isa_br->prom_name));
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prop_len = prom_getproperty(isa_br->prom_node,
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"ranges",
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(char *) isa_br->isa_ranges,
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sizeof(isa_br->isa_ranges));
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if (prop_len <= 0)
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isa_br->num_isa_ranges = 0;
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else
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isa_br->num_isa_ranges =
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(prop_len / sizeof(struct linux_prom_isa_ranges));
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prop_len = prom_getproperty(isa_br->prom_node,
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"interrupt-map",
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(char *) isa_br->isa_intmap,
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sizeof(isa_br->isa_intmap));
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if (prop_len <= 0)
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isa_br->num_isa_intmap = 0;
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else
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isa_br->num_isa_intmap =
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(prop_len / sizeof(struct linux_prom_isa_intmap));
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prop_len = prom_getproperty(isa_br->prom_node,
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"interrupt-map-mask",
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(char *) &(isa_br->isa_intmask),
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sizeof(isa_br->isa_intmask));
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printk("isa%d:", isa_br->index);
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isa_fill_devices(isa_br);
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printk("\n");
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}
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}
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