1 /* sbus.c: SBus support routines.
3 * Copyright (C) 1995, 2006 David S. Miller (davem@davemloft.net)
6 #include <linux/kernel.h>
7 #include <linux/slab.h>
8 #include <linux/init.h>
9 #include <linux/device.h>
11 #include <asm/system.h>
14 #include <asm/oplib.h>
16 #include <asm/of_device.h>
21 show_sbusobppath_attr(struct device * dev, struct device_attribute * attr, char * buf)
23 struct sbus_dev *sbus;
25 sbus = to_sbus_device(dev);
27 return snprintf (buf, PAGE_SIZE, "%s\n", sbus->ofdev.node->full_name);
30 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, show_sbusobppath_attr, NULL);
32 struct sbus_bus *sbus_root;
34 static void __init fill_sbus_device(struct device_node *dp, struct sbus_dev *sdev)
40 sdev->prom_node = dp->node;
41 strcpy(sdev->prom_name, dp->name);
43 pval = of_get_property(dp, "reg", &len);
44 sdev->num_registers = 0;
46 memcpy(sdev->reg_addrs, pval, len);
49 len / sizeof(struct linux_prom_registers);
51 base = (unsigned long) sdev->reg_addrs[0].phys_addr;
53 /* Compute the slot number. */
54 if (base >= SUN_SBUS_BVADDR && sparc_cpu_model == sun4m)
55 sdev->slot = sbus_dev_slot(base);
57 sdev->slot = sdev->reg_addrs[0].which_io;
60 pval = of_get_property(dp, "ranges", &len);
61 sdev->num_device_ranges = 0;
63 memcpy(sdev->device_ranges, pval, len);
64 sdev->num_device_ranges =
65 len / sizeof(struct linux_prom_ranges);
68 sbus_fill_device_irq(sdev);
70 sdev->ofdev.node = dp;
72 sdev->ofdev.dev.parent = &sdev->parent->ofdev.dev;
74 sdev->ofdev.dev.parent = &sdev->bus->ofdev.dev;
75 sdev->ofdev.dev.bus = &sbus_bus_type;
76 sprintf(sdev->ofdev.dev.bus_id, "sbus[%08x]", dp->node);
78 if (of_device_register(&sdev->ofdev) != 0)
79 printk(KERN_DEBUG "sbus: device registration error for %s!\n",
80 dp->path_component_name);
82 /* WE HAVE BEEN INVADED BY ALIENS! */
83 err = sysfs_create_file(&sdev->ofdev.dev.kobj, &dev_attr_obppath.attr);
86 static void __init sbus_bus_ranges_init(struct device_node *dp, struct sbus_bus *sbus)
91 pval = of_get_property(dp, "ranges", &len);
92 sbus->num_sbus_ranges = 0;
94 memcpy(sbus->sbus_ranges, pval, len);
95 sbus->num_sbus_ranges =
96 len / sizeof(struct linux_prom_ranges);
98 sbus_arch_bus_ranges_init(dp->parent, sbus);
102 static void __init __apply_ranges_to_regs(struct linux_prom_ranges *ranges,
104 struct linux_prom_registers *regs,
110 for (regnum = 0; regnum < num_regs; regnum++) {
113 for (rngnum = 0; rngnum < num_ranges; rngnum++) {
114 if (regs[regnum].which_io == ranges[rngnum].ot_child_space)
117 if (rngnum == num_ranges) {
118 /* We used to flag this as an error. Actually
119 * some devices do not report the regs as we expect.
120 * For example, see SUNW,pln device. In that case
121 * the reg property is in a format internal to that
122 * node, ie. it is not in the SBUS register space
127 regs[regnum].which_io = ranges[rngnum].ot_parent_space;
128 regs[regnum].phys_addr -= ranges[rngnum].ot_child_base;
129 regs[regnum].phys_addr += ranges[rngnum].ot_parent_base;
134 static void __init __fixup_regs_sdev(struct sbus_dev *sdev)
136 if (sdev->num_registers != 0) {
137 struct sbus_dev *parent = sdev->parent;
140 while (parent != NULL) {
141 __apply_ranges_to_regs(parent->device_ranges,
142 parent->num_device_ranges,
144 sdev->num_registers);
146 parent = parent->parent;
149 __apply_ranges_to_regs(sdev->bus->sbus_ranges,
150 sdev->bus->num_sbus_ranges,
152 sdev->num_registers);
154 for (i = 0; i < sdev->num_registers; i++) {
155 struct resource *res = &sdev->resource[i];
157 res->start = sdev->reg_addrs[i].phys_addr;
158 res->end = (res->start +
159 (unsigned long)sdev->reg_addrs[i].reg_size - 1UL);
160 res->flags = IORESOURCE_IO |
161 (sdev->reg_addrs[i].which_io & 0xff);
166 static void __init sbus_fixup_all_regs(struct sbus_dev *first_sdev)
168 struct sbus_dev *sdev;
170 for (sdev = first_sdev; sdev; sdev = sdev->next) {
172 sbus_fixup_all_regs(sdev->child);
173 __fixup_regs_sdev(sdev);
177 /* We preserve the "probe order" of these bus and device lists to give
178 * the same ordering as the old code.
180 static void __init sbus_insert(struct sbus_bus *sbus, struct sbus_bus **root)
183 root = &(*root)->next;
188 static void __init sdev_insert(struct sbus_dev *sdev, struct sbus_dev **root)
191 root = &(*root)->next;
196 static void __init walk_children(struct device_node *dp, struct sbus_dev *parent, struct sbus_bus *sbus)
200 struct sbus_dev *sdev;
202 sdev = kzalloc(sizeof(struct sbus_dev), GFP_ATOMIC);
204 sdev_insert(sdev, &parent->child);
207 sdev->parent = parent;
209 fill_sbus_device(dp, sdev);
211 walk_children(dp, sdev, sbus);
217 static void __init build_one_sbus(struct device_node *dp, int num_sbus)
219 struct sbus_bus *sbus;
220 unsigned int sbus_clock;
221 struct device_node *dev_dp;
223 sbus = kzalloc(sizeof(struct sbus_bus), GFP_ATOMIC);
227 sbus_insert(sbus, &sbus_root);
228 sbus->prom_node = dp->node;
230 sbus_setup_iommu(sbus, dp);
232 printk("sbus%d: ", num_sbus);
234 sbus_clock = of_getintprop_default(dp, "clock-frequency",
236 sbus->clock_freq = sbus_clock;
238 printk("Clock %d.%d MHz\n", (int) ((sbus_clock/1000)/1000),
239 (int) (((sbus_clock/1000)%1000 != 0) ?
240 (((sbus_clock/1000)%1000) + 1000) : 0));
242 strcpy(sbus->prom_name, dp->name);
244 sbus_setup_arch_props(sbus, dp);
246 sbus_bus_ranges_init(dp, sbus);
248 sbus->ofdev.node = dp;
249 sbus->ofdev.dev.parent = NULL;
250 sbus->ofdev.dev.bus = &sbus_bus_type;
251 sprintf(sbus->ofdev.dev.bus_id, "sbus%d", num_sbus);
253 if (of_device_register(&sbus->ofdev) != 0)
254 printk(KERN_DEBUG "sbus: device registration error for %s!\n",
255 sbus->ofdev.dev.bus_id);
259 struct sbus_dev *sdev;
261 sdev = kzalloc(sizeof(struct sbus_dev), GFP_ATOMIC);
263 sdev_insert(sdev, &sbus->devices);
267 fill_sbus_device(dev_dp, sdev);
269 walk_children(dev_dp, sdev, sbus);
271 dev_dp = dev_dp->sibling;
274 sbus_fixup_all_regs(sbus->devices);
279 static int __init sbus_init(void)
281 struct device_node *dp;
282 const char *sbus_name = "sbus";
285 if (sbus_arch_preinit())
288 if (sparc_cpu_model == sun4d)
291 for_each_node_by_name(dp, sbus_name) {
292 build_one_sbus(dp, num_sbus);
297 sbus_arch_postinit();
302 subsys_initcall(sbus_init);