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>
10 #include <linux/device.h>
12 #include <asm/system.h>
15 #include <asm/oplib.h>
17 #include <asm/of_device.h>
22 show_sbusobppath_attr(struct device * dev, struct device_attribute * attr, char * buf)
24 struct sbus_dev *sbus;
26 sbus = to_sbus_device(dev);
28 return snprintf (buf, PAGE_SIZE, "%s\n", sbus->ofdev.node->full_name);
31 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, show_sbusobppath_attr, NULL);
33 struct sbus_bus *sbus_root;
35 static void __init fill_sbus_device(struct device_node *dp, struct sbus_dev *sdev)
41 sdev->prom_node = dp->node;
42 strcpy(sdev->prom_name, dp->name);
44 pval = of_get_property(dp, "reg", &len);
45 sdev->num_registers = 0;
47 memcpy(sdev->reg_addrs, pval, len);
50 len / sizeof(struct linux_prom_registers);
52 base = (unsigned long) sdev->reg_addrs[0].phys_addr;
54 /* Compute the slot number. */
55 if (base >= SUN_SBUS_BVADDR && sparc_cpu_model == sun4m)
56 sdev->slot = sbus_dev_slot(base);
58 sdev->slot = sdev->reg_addrs[0].which_io;
61 pval = of_get_property(dp, "ranges", &len);
62 sdev->num_device_ranges = 0;
64 memcpy(sdev->device_ranges, pval, len);
65 sdev->num_device_ranges =
66 len / sizeof(struct linux_prom_ranges);
69 sbus_fill_device_irq(sdev);
71 sdev->ofdev.node = dp;
73 sdev->ofdev.dev.parent = &sdev->parent->ofdev.dev;
75 sdev->ofdev.dev.parent = &sdev->bus->ofdev.dev;
76 sdev->ofdev.dev.bus = &sbus_bus_type;
77 sprintf(sdev->ofdev.dev.bus_id, "sbus[%08x]", dp->node);
79 if (of_device_register(&sdev->ofdev) != 0)
80 printk(KERN_DEBUG "sbus: device registration error for %s!\n",
81 dp->path_component_name);
83 /* WE HAVE BEEN INVADED BY ALIENS! */
84 err = sysfs_create_file(&sdev->ofdev.dev.kobj, &dev_attr_obppath.attr);
87 static void __init sbus_bus_ranges_init(struct device_node *dp, struct sbus_bus *sbus)
92 pval = of_get_property(dp, "ranges", &len);
93 sbus->num_sbus_ranges = 0;
95 memcpy(sbus->sbus_ranges, pval, len);
96 sbus->num_sbus_ranges =
97 len / sizeof(struct linux_prom_ranges);
99 sbus_arch_bus_ranges_init(dp->parent, sbus);
103 static void __init __apply_ranges_to_regs(struct linux_prom_ranges *ranges,
105 struct linux_prom_registers *regs,
111 for (regnum = 0; regnum < num_regs; regnum++) {
114 for (rngnum = 0; rngnum < num_ranges; rngnum++) {
115 if (regs[regnum].which_io == ranges[rngnum].ot_child_space)
118 if (rngnum == num_ranges) {
119 /* We used to flag this as an error. Actually
120 * some devices do not report the regs as we expect.
121 * For example, see SUNW,pln device. In that case
122 * the reg property is in a format internal to that
123 * node, ie. it is not in the SBUS register space
128 regs[regnum].which_io = ranges[rngnum].ot_parent_space;
129 regs[regnum].phys_addr -= ranges[rngnum].ot_child_base;
130 regs[regnum].phys_addr += ranges[rngnum].ot_parent_base;
135 static void __init __fixup_regs_sdev(struct sbus_dev *sdev)
137 if (sdev->num_registers != 0) {
138 struct sbus_dev *parent = sdev->parent;
141 while (parent != NULL) {
142 __apply_ranges_to_regs(parent->device_ranges,
143 parent->num_device_ranges,
145 sdev->num_registers);
147 parent = parent->parent;
150 __apply_ranges_to_regs(sdev->bus->sbus_ranges,
151 sdev->bus->num_sbus_ranges,
153 sdev->num_registers);
155 for (i = 0; i < sdev->num_registers; i++) {
156 struct resource *res = &sdev->resource[i];
158 res->start = sdev->reg_addrs[i].phys_addr;
159 res->end = (res->start +
160 (unsigned long)sdev->reg_addrs[i].reg_size - 1UL);
161 res->flags = IORESOURCE_IO |
162 (sdev->reg_addrs[i].which_io & 0xff);
167 static void __init sbus_fixup_all_regs(struct sbus_dev *first_sdev)
169 struct sbus_dev *sdev;
171 for (sdev = first_sdev; sdev; sdev = sdev->next) {
173 sbus_fixup_all_regs(sdev->child);
174 __fixup_regs_sdev(sdev);
178 /* We preserve the "probe order" of these bus and device lists to give
179 * the same ordering as the old code.
181 static void __init sbus_insert(struct sbus_bus *sbus, struct sbus_bus **root)
184 root = &(*root)->next;
189 static void __init sdev_insert(struct sbus_dev *sdev, struct sbus_dev **root)
192 root = &(*root)->next;
197 static void __init walk_children(struct device_node *dp, struct sbus_dev *parent, struct sbus_bus *sbus)
201 struct sbus_dev *sdev;
203 sdev = kzalloc(sizeof(struct sbus_dev), GFP_ATOMIC);
205 sdev_insert(sdev, &parent->child);
208 sdev->parent = parent;
210 fill_sbus_device(dp, sdev);
212 walk_children(dp, sdev, sbus);
218 static void __init build_one_sbus(struct device_node *dp, int num_sbus)
220 struct sbus_bus *sbus;
221 unsigned int sbus_clock;
222 struct device_node *dev_dp;
224 sbus = kzalloc(sizeof(struct sbus_bus), GFP_ATOMIC);
228 sbus_insert(sbus, &sbus_root);
229 sbus->prom_node = dp->node;
231 sbus_setup_iommu(sbus, dp);
233 printk("sbus%d: ", num_sbus);
235 sbus_clock = of_getintprop_default(dp, "clock-frequency",
237 sbus->clock_freq = sbus_clock;
239 printk("Clock %d.%d MHz\n", (int) ((sbus_clock/1000)/1000),
240 (int) (((sbus_clock/1000)%1000 != 0) ?
241 (((sbus_clock/1000)%1000) + 1000) : 0));
243 strcpy(sbus->prom_name, dp->name);
245 sbus_setup_arch_props(sbus, dp);
247 sbus_bus_ranges_init(dp, sbus);
249 sbus->ofdev.node = dp;
250 sbus->ofdev.dev.parent = NULL;
251 sbus->ofdev.dev.bus = &sbus_bus_type;
252 sprintf(sbus->ofdev.dev.bus_id, "sbus%d", num_sbus);
254 if (of_device_register(&sbus->ofdev) != 0)
255 printk(KERN_DEBUG "sbus: device registration error for %s!\n",
256 sbus->ofdev.dev.bus_id);
260 struct sbus_dev *sdev;
262 sdev = kzalloc(sizeof(struct sbus_dev), GFP_ATOMIC);
264 sdev_insert(sdev, &sbus->devices);
268 fill_sbus_device(dev_dp, sdev);
270 walk_children(dev_dp, sdev, sbus);
272 dev_dp = dev_dp->sibling;
275 sbus_fixup_all_regs(sbus->devices);
280 static int __init sbus_init(void)
282 struct device_node *dp;
283 const char *sbus_name = "sbus";
286 if (sbus_arch_preinit())
289 if (sparc_cpu_model == sun4d)
292 for_each_node_by_name(dp, sbus_name) {
293 build_one_sbus(dp, num_sbus);
298 sbus_arch_postinit();
303 subsys_initcall(sbus_init);