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-rw-r--r--arch/sparc64/kernel/isa.c329
1 files changed, 329 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/isa.c b/arch/sparc64/kernel/isa.c
new file mode 100644
index 000000000000..30862abee611
--- /dev/null
+++ b/arch/sparc64/kernel/isa.c
@@ -0,0 +1,329 @@
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <asm/oplib.h>
+#include <asm/isa.h>
+
+struct sparc_isa_bridge *isa_chain;
+
+static void __init fatal_err(const char *reason)
+{
+ prom_printf("ISA: fatal error, %s.\n", reason);
+}
+
+static void __init report_dev(struct sparc_isa_device *isa_dev, int child)
+{
+ if (child)
+ printk(" (%s)", isa_dev->prom_name);
+ else
+ printk(" [%s", isa_dev->prom_name);
+}
+
+static void __init isa_dev_get_resource(struct sparc_isa_device *isa_dev,
+ struct linux_prom_registers *pregs,
+ int pregs_size)
+{
+ unsigned long base, len;
+ int prop_len;
+
+ prop_len = prom_getproperty(isa_dev->prom_node, "reg",
+ (char *) pregs, pregs_size);
+
+ if (prop_len <= 0)
+ return;
+
+ /* Only the first one is interesting. */
+ len = pregs[0].reg_size;
+ base = (((unsigned long)pregs[0].which_io << 32) |
+ (unsigned long)pregs[0].phys_addr);
+ base += isa_dev->bus->parent->io_space.start;
+
+ isa_dev->resource.start = base;
+ isa_dev->resource.end = (base + len - 1UL);
+ isa_dev->resource.flags = IORESOURCE_IO;
+ isa_dev->resource.name = isa_dev->prom_name;
+
+ request_resource(&isa_dev->bus->parent->io_space,
+ &isa_dev->resource);
+}
+
+/* I can't believe they didn't put a real INO in the isa device
+ * interrupts property. The whole point of the OBP properties
+ * is to shield the kernel from IRQ routing details.
+ *
+ * The P1275 standard for ISA devices seems to also have been
+ * totally ignored.
+ *
+ * On later systems, an interrupt-map and interrupt-map-mask scheme
+ * akin to EBUS is used.
+ */
+static struct {
+ int obp_irq;
+ int pci_ino;
+} grover_irq_table[] = {
+ { 1, 0x00 }, /* dma, unknown ino at this point */
+ { 2, 0x27 }, /* floppy */
+ { 3, 0x22 }, /* parallel */
+ { 4, 0x2b }, /* serial */
+ { 5, 0x25 }, /* acpi power management */
+
+ { 0, 0x00 } /* end of table */
+};
+
+static int __init isa_dev_get_irq_using_imap(struct sparc_isa_device *isa_dev,
+ struct sparc_isa_bridge *isa_br,
+ int *interrupt,
+ struct linux_prom_registers *pregs)
+{
+ unsigned int hi, lo, irq;
+ int i;
+
+ hi = pregs->which_io & isa_br->isa_intmask.phys_hi;
+ lo = pregs->phys_addr & isa_br->isa_intmask.phys_lo;
+ irq = *interrupt & isa_br->isa_intmask.interrupt;
+ for (i = 0; i < isa_br->num_isa_intmap; i++) {
+ if ((isa_br->isa_intmap[i].phys_hi == hi) &&
+ (isa_br->isa_intmap[i].phys_lo == lo) &&
+ (isa_br->isa_intmap[i].interrupt == irq)) {
+ *interrupt = isa_br->isa_intmap[i].cinterrupt;
+ return 0;
+ }
+ }
+ return -1;
+}
+
+static void __init isa_dev_get_irq(struct sparc_isa_device *isa_dev,
+ struct linux_prom_registers *pregs)
+{
+ int irq_prop;
+
+ irq_prop = prom_getintdefault(isa_dev->prom_node,
+ "interrupts", -1);
+ if (irq_prop <= 0) {
+ goto no_irq;
+ } else {
+ struct pci_controller_info *pcic;
+ struct pci_pbm_info *pbm;
+ int i;
+
+ if (isa_dev->bus->num_isa_intmap) {
+ if (!isa_dev_get_irq_using_imap(isa_dev,
+ isa_dev->bus,
+ &irq_prop,
+ pregs))
+ goto route_irq;
+ }
+
+ for (i = 0; grover_irq_table[i].obp_irq != 0; i++) {
+ if (grover_irq_table[i].obp_irq == irq_prop) {
+ int ino = grover_irq_table[i].pci_ino;
+
+ if (ino == 0)
+ goto no_irq;
+
+ irq_prop = ino;
+ goto route_irq;
+ }
+ }
+ goto no_irq;
+
+route_irq:
+ pbm = isa_dev->bus->parent;
+ pcic = pbm->parent;
+ isa_dev->irq = pcic->irq_build(pbm, NULL, irq_prop);
+ return;
+ }
+
+no_irq:
+ isa_dev->irq = PCI_IRQ_NONE;
+}
+
+static void __init isa_fill_children(struct sparc_isa_device *parent_isa_dev)
+{
+ int node = prom_getchild(parent_isa_dev->prom_node);
+
+ if (node == 0)
+ return;
+
+ printk(" ->");
+ while (node != 0) {
+ struct linux_prom_registers regs[PROMREG_MAX];
+ struct sparc_isa_device *isa_dev;
+ int prop_len;
+
+ isa_dev = kmalloc(sizeof(*isa_dev), GFP_KERNEL);
+ if (!isa_dev) {
+ fatal_err("cannot allocate child isa_dev");
+ prom_halt();
+ }
+
+ memset(isa_dev, 0, sizeof(*isa_dev));
+
+ /* Link it in to parent. */
+ isa_dev->next = parent_isa_dev->child;
+ parent_isa_dev->child = isa_dev;
+
+ isa_dev->bus = parent_isa_dev->bus;
+ isa_dev->prom_node = node;
+ prop_len = prom_getproperty(node, "name",
+ (char *) isa_dev->prom_name,
+ sizeof(isa_dev->prom_name));
+ if (prop_len <= 0) {
+ fatal_err("cannot get child isa_dev OBP node name");
+ prom_halt();
+ }
+
+ prop_len = prom_getproperty(node, "compatible",
+ (char *) isa_dev->compatible,
+ sizeof(isa_dev->compatible));
+
+ /* Not having this is OK. */
+ if (prop_len <= 0)
+ isa_dev->compatible[0] = '\0';
+
+ isa_dev_get_resource(isa_dev, regs, sizeof(regs));
+ isa_dev_get_irq(isa_dev, regs);
+
+ report_dev(isa_dev, 1);
+
+ node = prom_getsibling(node);
+ }
+}
+
+static void __init isa_fill_devices(struct sparc_isa_bridge *isa_br)
+{
+ int node = prom_getchild(isa_br->prom_node);
+
+ while (node != 0) {
+ struct linux_prom_registers regs[PROMREG_MAX];
+ struct sparc_isa_device *isa_dev;
+ int prop_len;
+
+ isa_dev = kmalloc(sizeof(*isa_dev), GFP_KERNEL);
+ if (!isa_dev) {
+ fatal_err("cannot allocate isa_dev");
+ prom_halt();
+ }
+
+ memset(isa_dev, 0, sizeof(*isa_dev));
+
+ /* Link it in. */
+ isa_dev->next = NULL;
+ if (isa_br->devices == NULL) {
+ isa_br->devices = isa_dev;
+ } else {
+ struct sparc_isa_device *tmp = isa_br->devices;
+
+ while (tmp->next)
+ tmp = tmp->next;
+
+ tmp->next = isa_dev;
+ }
+
+ isa_dev->bus = isa_br;
+ isa_dev->prom_node = node;
+ prop_len = prom_getproperty(node, "name",
+ (char *) isa_dev->prom_name,
+ sizeof(isa_dev->prom_name));
+ if (prop_len <= 0) {
+ fatal_err("cannot get isa_dev OBP node name");
+ prom_halt();
+ }
+
+ prop_len = prom_getproperty(node, "compatible",
+ (char *) isa_dev->compatible,
+ sizeof(isa_dev->compatible));
+
+ /* Not having this is OK. */
+ if (prop_len <= 0)
+ isa_dev->compatible[0] = '\0';
+
+ isa_dev_get_resource(isa_dev, regs, sizeof(regs));
+ isa_dev_get_irq(isa_dev, regs);
+
+ report_dev(isa_dev, 0);
+
+ isa_fill_children(isa_dev);
+
+ printk("]");
+
+ node = prom_getsibling(node);
+ }
+}
+
+void __init isa_init(void)
+{
+ struct pci_dev *pdev;
+ unsigned short vendor, device;
+ int index = 0;
+
+ vendor = PCI_VENDOR_ID_AL;
+ device = PCI_DEVICE_ID_AL_M1533;
+
+ pdev = NULL;
+ while ((pdev = pci_get_device(vendor, device, pdev)) != NULL) {
+ struct pcidev_cookie *pdev_cookie;
+ struct pci_pbm_info *pbm;
+ struct sparc_isa_bridge *isa_br;
+ int prop_len;
+
+ pdev_cookie = pdev->sysdata;
+ if (!pdev_cookie) {
+ printk("ISA: Warning, ISA bridge ignored due to "
+ "lack of OBP data.\n");
+ continue;
+ }
+ pbm = pdev_cookie->pbm;
+
+ isa_br = kmalloc(sizeof(*isa_br), GFP_KERNEL);
+ if (!isa_br) {
+ fatal_err("cannot allocate sparc_isa_bridge");
+ prom_halt();
+ }
+
+ memset(isa_br, 0, sizeof(*isa_br));
+
+ /* Link it in. */
+ isa_br->next = isa_chain;
+ isa_chain = isa_br;
+
+ isa_br->parent = pbm;
+ isa_br->self = pdev;
+ isa_br->index = index++;
+ isa_br->prom_node = pdev_cookie->prom_node;
+ strncpy(isa_br->prom_name, pdev_cookie->prom_name,
+ sizeof(isa_br->prom_name));
+
+ prop_len = prom_getproperty(isa_br->prom_node,
+ "ranges",
+ (char *) isa_br->isa_ranges,
+ sizeof(isa_br->isa_ranges));
+ if (prop_len <= 0)
+ isa_br->num_isa_ranges = 0;
+ else
+ isa_br->num_isa_ranges =
+ (prop_len / sizeof(struct linux_prom_isa_ranges));
+
+ prop_len = prom_getproperty(isa_br->prom_node,
+ "interrupt-map",
+ (char *) isa_br->isa_intmap,
+ sizeof(isa_br->isa_intmap));
+ if (prop_len <= 0)
+ isa_br->num_isa_intmap = 0;
+ else
+ isa_br->num_isa_intmap =
+ (prop_len / sizeof(struct linux_prom_isa_intmap));
+
+ prop_len = prom_getproperty(isa_br->prom_node,
+ "interrupt-map-mask",
+ (char *) &(isa_br->isa_intmask),
+ sizeof(isa_br->isa_intmask));
+
+ printk("isa%d:", isa_br->index);
+
+ isa_fill_devices(isa_br);
+
+ printk("\n");
+ }
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.