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>
11 #include <asm/system.h>
14 #include <asm/oplib.h>
16 #include <asm/of_device.h>
20 struct sbus_bus *sbus_root;
22 static void __init fill_sbus_device(struct device_node *dp, struct sbus_dev *sdev)
28 sdev->prom_node = dp->node;
29 strcpy(sdev->prom_name, dp->name);
31 pval = of_get_property(dp, "reg", &len);
32 sdev->num_registers = 0;
34 memcpy(sdev->reg_addrs, pval, len);
37 len / sizeof(struct linux_prom_registers);
39 base = (unsigned long) sdev->reg_addrs[0].phys_addr;
41 /* Compute the slot number. */
42 if (base >= SUN_SBUS_BVADDR && sparc_cpu_model == sun4m)
43 sdev->slot = sbus_dev_slot(base);
45 sdev->slot = sdev->reg_addrs[0].which_io;
48 pval = of_get_property(dp, "ranges", &len);
49 sdev->num_device_ranges = 0;
51 memcpy(sdev->device_ranges, pval, len);
52 sdev->num_device_ranges =
53 len / sizeof(struct linux_prom_ranges);
56 sbus_fill_device_irq(sdev);
58 sdev->ofdev.node = dp;
60 sdev->ofdev.dev.parent = &sdev->parent->ofdev.dev;
62 sdev->ofdev.dev.parent = &sdev->bus->ofdev.dev;
63 sdev->ofdev.dev.bus = &sbus_bus_type;
64 strcpy(sdev->ofdev.dev.bus_id, dp->path_component_name);
66 if (of_device_register(&sdev->ofdev) != 0)
67 printk(KERN_DEBUG "sbus: device registration error for %s!\n",
68 sdev->ofdev.dev.bus_id);
71 static void __init sbus_bus_ranges_init(struct device_node *dp, struct sbus_bus *sbus)
76 pval = of_get_property(dp, "ranges", &len);
77 sbus->num_sbus_ranges = 0;
79 memcpy(sbus->sbus_ranges, pval, len);
80 sbus->num_sbus_ranges =
81 len / sizeof(struct linux_prom_ranges);
83 sbus_arch_bus_ranges_init(dp->parent, sbus);
87 static void __init __apply_ranges_to_regs(struct linux_prom_ranges *ranges,
89 struct linux_prom_registers *regs,
95 for (regnum = 0; regnum < num_regs; regnum++) {
98 for (rngnum = 0; rngnum < num_ranges; rngnum++) {
99 if (regs[regnum].which_io == ranges[rngnum].ot_child_space)
102 if (rngnum == num_ranges) {
103 /* We used to flag this as an error. Actually
104 * some devices do not report the regs as we expect.
105 * For example, see SUNW,pln device. In that case
106 * the reg property is in a format internal to that
107 * node, ie. it is not in the SBUS register space
112 regs[regnum].which_io = ranges[rngnum].ot_parent_space;
113 regs[regnum].phys_addr -= ranges[rngnum].ot_child_base;
114 regs[regnum].phys_addr += ranges[rngnum].ot_parent_base;
119 static void __init __fixup_regs_sdev(struct sbus_dev *sdev)
121 if (sdev->num_registers != 0) {
122 struct sbus_dev *parent = sdev->parent;
125 while (parent != NULL) {
126 __apply_ranges_to_regs(parent->device_ranges,
127 parent->num_device_ranges,
129 sdev->num_registers);
131 parent = parent->parent;
134 __apply_ranges_to_regs(sdev->bus->sbus_ranges,
135 sdev->bus->num_sbus_ranges,
137 sdev->num_registers);
139 for (i = 0; i < sdev->num_registers; i++) {
140 struct resource *res = &sdev->resource[i];
142 res->start = sdev->reg_addrs[i].phys_addr;
143 res->end = (res->start +
144 (unsigned long)sdev->reg_addrs[i].reg_size - 1UL);
145 res->flags = IORESOURCE_IO |
146 (sdev->reg_addrs[i].which_io & 0xff);
151 static void __init sbus_fixup_all_regs(struct sbus_dev *first_sdev)
153 struct sbus_dev *sdev;
155 for (sdev = first_sdev; sdev; sdev = sdev->next) {
157 sbus_fixup_all_regs(sdev->child);
158 __fixup_regs_sdev(sdev);
162 /* We preserve the "probe order" of these bus and device lists to give
163 * the same ordering as the old code.
165 static void __init sbus_insert(struct sbus_bus *sbus, struct sbus_bus **root)
168 root = &(*root)->next;
173 static void __init sdev_insert(struct sbus_dev *sdev, struct sbus_dev **root)
176 root = &(*root)->next;
181 static void __init walk_children(struct device_node *dp, struct sbus_dev *parent, struct sbus_bus *sbus)
185 struct sbus_dev *sdev;
187 sdev = kzalloc(sizeof(struct sbus_dev), GFP_ATOMIC);
189 sdev_insert(sdev, &parent->child);
192 sdev->parent = parent;
194 fill_sbus_device(dp, sdev);
196 walk_children(dp, sdev, sbus);
202 static void __init build_one_sbus(struct device_node *dp, int num_sbus)
204 struct sbus_bus *sbus;
205 unsigned int sbus_clock;
206 struct device_node *dev_dp;
208 sbus = kzalloc(sizeof(struct sbus_bus), GFP_ATOMIC);
212 sbus_insert(sbus, &sbus_root);
213 sbus->prom_node = dp->node;
215 sbus_setup_iommu(sbus, dp);
217 printk("sbus%d: ", num_sbus);
219 sbus_clock = of_getintprop_default(dp, "clock-frequency",
221 sbus->clock_freq = sbus_clock;
223 printk("Clock %d.%d MHz\n", (int) ((sbus_clock/1000)/1000),
224 (int) (((sbus_clock/1000)%1000 != 0) ?
225 (((sbus_clock/1000)%1000) + 1000) : 0));
227 strcpy(sbus->prom_name, dp->name);
229 sbus_setup_arch_props(sbus, dp);
231 sbus_bus_ranges_init(dp, sbus);
233 sbus->ofdev.node = dp;
234 sbus->ofdev.dev.parent = NULL;
235 sbus->ofdev.dev.bus = &sbus_bus_type;
236 strcpy(sbus->ofdev.dev.bus_id, dp->path_component_name);
238 if (of_device_register(&sbus->ofdev) != 0)
239 printk(KERN_DEBUG "sbus: device registration error for %s!\n",
240 sbus->ofdev.dev.bus_id);
244 struct sbus_dev *sdev;
246 sdev = kzalloc(sizeof(struct sbus_dev), GFP_ATOMIC);
248 sdev_insert(sdev, &sbus->devices);
252 fill_sbus_device(dev_dp, sdev);
254 walk_children(dev_dp, sdev, sbus);
256 dev_dp = dev_dp->sibling;
259 sbus_fixup_all_regs(sbus->devices);
264 static int __init sbus_init(void)
266 struct device_node *dp;
267 const char *sbus_name = "sbus";
270 if (sbus_arch_preinit())
273 if (sparc_cpu_model == sun4d)
276 for_each_node_by_name(dp, sbus_name) {
277 build_one_sbus(dp, num_sbus);
282 sbus_arch_postinit();
287 subsys_initcall(sbus_init);