#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
static int node_match(struct device *dev, void *data)
{
struct of_device *op = to_of_device(dev);
struct device_node *dp = data;
return (op->node == dp);
}
struct of_device *of_find_device_by_node(struct device_node *dp)
{
struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
dp, node_match);
if (dev)
return to_of_device(dev);
return NULL;
}
EXPORT_SYMBOL(of_find_device_by_node);
unsigned int irq_of_parse_and_map(struct device_node *node, int index)
{
struct of_device *op = of_find_device_by_node(node);
if (!op || index >= op->num_irqs)
return 0;
return op->irqs[index];
}
EXPORT_SYMBOL(irq_of_parse_and_map);
/* Take the archdata values for IOMMU, STC, and HOSTDATA found in
* BUS and propagate to all child of_device objects.
*/
void of_propagate_archdata(struct of_device *bus)
{
struct dev_archdata *bus_sd = &bus->dev.archdata;
struct device_node *bus_dp = bus->node;
struct device_node *dp;
for (dp = bus_dp->child; dp; dp = dp->sibling) {
struct of_device *op = of_find_device_by_node(dp);
op->dev.archdata.iommu = bus_sd->iommu;
op->dev.archdata.stc = bus_sd->stc;
op->dev.archdata.host_controller = bus_sd->host_controller;
op->dev.archdata.numa_node = bus_sd->numa_node;
if (dp->child)
of_propagate_archdata(op);
}
}
struct bus_type of_platform_bus_type;
EXPORT_SYMBOL(of_platform_bus_type);
static inline u64 of_read_addr(const u32 *cell, int size)
{
u64 r = 0;
while (size--)
r = (r << 32) | *(cell++);
return r;
}
static void __init get_cells(struct device_node *dp,
int *addrc, int *sizec)
{
if (addrc)
*addrc = of_n_addr_cells(dp);
if (sizec)
*sizec = of_n_size_cells(dp);
}
/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS 4
struct of_bus {
const char *name;
const char *addr_prop_name;
int (*match)(struct device_node *parent);
void (*count_cells)(struct device_node *child,
int *addrc, int *sizec);
int (*map)(u32 *addr, const u32 *range,
int na, int ns, int pna);
unsigned long (*get_flags)(const u32 *addr, unsigned long);
};
/*
* Default translator (generic bus)
*/
static void of_bus_default_count_cells(struct device_node *dev,
int *addrc, int *sizec)
{
get_cells(dev, addrc, sizec);
}
/* Make sure the least significant 64-bits are in-range. Even
* for 3 or 4 cell values it is a good enough approximation.
*/
static int of_out_of_range(const u32 *addr, const u32 *base,
const u32 *size, int na, int ns)
{
u64 a = of_read_addr(addr, na);
u64 b = of_read_addr(base, na);
if (a < b)
return 1;
b += of_read_addr(size, ns);
if (a >= b)
return 1;
return 0;
}
static int of_bus_default_map(u32 *addr, const u32 *range,
int na, int ns, int pna)
{
u32 result[OF_MAX_ADDR_CELLS];
int i;
if (ns > 2) {
printk("of_device: Cannot handle size cells (%d) > 2.", ns);
return -EINVAL;
}
if (of_out_of_range(addr, range, range + na + pna, na, ns))
return -EINVAL;
/* Start with the parent range base. */
memcpy(result, range + na, pna * 4);
/* Add in the child address offset. */
for (i = 0; i < na; i++)
result[pna - 1 - i] +=
(addr[na - 1 - i] -
range[na - 1 - i]);
memcpy(addr, result, pna * 4);
return 0;
}
static unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
{
if (flags)
return flags;
return IORESOURCE_MEM;
}
/*
* PCI bus specific translator
*/
static int of_bus_pci_match(struct device_node *np)
{
if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
/* Do not do PCI specific frobbing if the
* PCI bridge lacks a ranges property. We
* want to pass it through up to the next
* parent as-is, not with the PCI translate
* method which chops off the top address cell.
*/
if (!of_find_property(np, "ranges", NULL))
return 0;
return 1;
}
return 0;
}
static void of_bus_pci_count_cells(struct device_node *np,
int *addrc, int *sizec)
{
if (addrc)
*addrc = 3;
if (sizec)
*sizec = 2;
}
static int of_bus_pci_map(u32 *addr, const u32 *range,
int na, int ns, int pna)
{
u32 result[OF_MAX_ADDR_CELLS];
int i;
/* Check address type match */
if ((addr[0] ^ range[0]) & 0x03000000)
return -EINVAL;
if (of_out_of_range(addr + 1, range + 1, range + na + pna,
na - 1, ns))
return -EINVAL;
/* Start with the parent range base. */
memcpy(result, range + na, pna * 4);
/* Add in the child address offset, skipping high cell. */
for (i = 0; i < na - 1; i++)
result[pna - 1 - i] +=
(addr[na - 1 - i] -
range[na - 1 - i]);
memcpy(addr, result, pna * 4);
return 0;
}
static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
{
u32 w = addr[0];
/* For PCI, we override whatever child busses may have used. */
flags = 0;
switch((w >> 24) & 0x03) {
case 0x01:
flags |= IORESOURCE_IO;
break;
case 0x02: /* 32 bits */
case 0x03: /* 64 bits */
flags |= IORESOURCE_MEM;
break;
}
if (w & 0x40000000)
flags |= IORESOURCE_PREFETCH;
return flags;
}
/*
* SBUS bus specific translator
*/
static int of_bus_sbus_match(struct device_node *np)
{
return !strcmp(np->name, "sbus") ||
!strcmp(np->name, "sbi");
}
static void of_bus_sbus_count_cells(struct device_node *child,
int *addrc, int *sizec)
{
if (addrc)
*addrc = 2;
if (sizec)
*sizec = 1;
}
static int of_bus_sbus_map(u32 *addr, const u32 *range, int na, int ns, int pna)
{
return of_bus_default_map(addr, range, na, ns, pna);
}
static unsigned long of_bus_sbus_get_flags(const u32 *addr, unsigned long flags)
{
return IORESOURCE_MEM;
}
/*
* Array of bus specific translators
*/
static struct of_bus of_busses[] = {
/* PCI */
{
.name = "pci",
.addr_prop_name = "assigned-addresses",
.match = of_bus_pci_match,
.count_cells = of_bus_pci_count_cells,
.map = of_bus_pci_map,
.get_flags = of_bus_pci_get_flags,
},
/* SBUS */
{
.name = "sbus",
.addr_prop_name = "reg",
.match = of_bus_sbus_match,
.count_cells = of_bus_sbus_count_cells,
.map = of_bus_sbus_map,
.get_flags = of_bus_sbus_get_flags,
},
/* Default */
{
.name = "default",
.addr_prop_name = "reg",
.match = NULL,
.count_cells = of_bus_default_count_cells,
.map = of_bus_default_map,
.get_flags = of_bus_default_get_flags,
},
};
static struct of_bus *of_match_bus(struct device_node *np)
{
int i;
for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
if (!of_busses[i].match || of_busses[i].match(np))
return &of_busses[i];
BUG();
return NULL;
}
static int __init build_one_resource(struct device_node *parent,
struct of_bus *bus,
struct of_bus *pbus,
u32 *addr,
int na, int ns, int pna)
{
const u32 *ranges;
unsigned int rlen;
int rone;
ranges = of_get_property(parent, "ranges", &rlen);
if (ranges == NULL || rlen == 0) {
u32 result[OF_MAX_ADDR_CELLS];
int i;
memset(result, 0, pna * 4);
for (i = 0; i < na; i++)
result[pna - 1 - i] =
addr[na - 1 - i];
memcpy(addr, result, pna * 4);
return 0;
}
/* Now walk through the ranges */
rlen /= 4;
rone = na + pna + ns;
for (; rlen >= rone; rlen -= rone, ranges += rone) {
if (!bus->map(addr, ranges, na, ns, pna))
return 0;
}
return 1;
}
static int __init use_1to1_mapping(struct device_node *pp)
{
/* If we have a ranges property in the parent, use it. */
if (of_find_property(pp, "ranges", NULL) != NULL)
return 0;
/* Some SBUS devices use intermediate nodes to express
* hierarchy within the device itself. These aren't
* real bus nodes, and don't have a 'ranges' property.
* But, we should still pass the translation work up
* to the SBUS itself.
*/
if (!strcmp(pp->name, "dma") ||
!strcmp(pp->name, "espdma") ||
!strcmp(pp->name, "ledma") ||
!strcmp(pp->name, "lebuffer"))
return 0;
return 1;
}
static int of_resource_verbose;
static void __init build_device_resources(struct of_device *op,
struct device *parent)
{
struct of_device *p_op;
struct of_bus *bus;
int na, ns;
int index, num_reg;
const void *preg;
if (!parent)
return;
p_op = to_of_device(parent);
bus = of_match_bus(p_op->node);
bus->count_cells(op->node, &na, &ns);
preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
if (!preg || num_reg == 0)
return;
/* Convert to num-cells. */
num_reg /= 4;
/* Conver to num-entries. */
num_reg /= na + ns;
for (index = 0; index < num_reg; index++) {
struct resource *r = &op->resource[index];
u32 addr[OF_MAX_ADDR_CELLS];
const u32 *reg = (preg + (index * ((na + ns) * 4)));
struct device_node *dp = op->node;
struct device_node *pp = p_op->node;
struct of_bus *pbus, *dbus;
u64 size, result = OF_BAD_ADDR;
unsigned long flags;
int dna, dns;
int pna, pns;
size = of_read_addr(reg + na, ns);
memcpy(addr, reg, na * 4);
flags = bus->get_flags(reg, 0);
if (use_1to1_mapping(pp)) {
result = of_read_addr(addr, na);
goto build_res;
}
dna = na;
dns = ns;
dbus = bus;
while (1) {
dp = pp;
pp = dp->parent;
if (!pp) {
result = of_read_addr(addr, dna);
break;
}
pbus = of_match_bus(pp);
pbus->count_cells(dp, &pna, &pns);
if (build_one_resource(dp, dbus, pbus, addr,
dna, dns, pna))
break;
flags = pbus->get_flags(addr, flags);
dna = pna;
dns = pns;
dbus = pbus;
}
build_res:
memset(r, 0, sizeof(*r));
if (of_resource_verbose)
printk("%s reg[%d] -> %llx\n",
op->node->full_name, index,
result);
if (result != OF_BAD_ADDR) {
r->start = result & 0xffffffff;
r->end = result + size - 1;
r->flags = flags | ((result >> 32ULL) & 0xffUL);
}
r->name = op->node->name;
}
}
static struct of_device * __init scan_one_device(struct device_node *dp,
struct device *parent)
{
struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
const struct linux_prom_irqs *intr;
struct dev_archdata *sd;
int len, i;
if (!op)
return NULL;
sd = &op->dev.archdata;
sd->prom_node = dp;
sd->op = op;
op->node = dp;
op->clock_freq = of_getintprop_default(dp, "clock-frequency",
(25*1000*1000));
op->portid = of_getintprop_default(dp, "upa-portid", -1);
if (op->portid == -1)
op->portid = of_getintprop_default(dp, "portid", -1);
intr = of_get_property(dp, "intr", &len);
if (intr) {
op->num_irqs = len / sizeof(struct linux_prom_irqs);
for (i = 0; i < op->num_irqs; i++)
op->irqs[i] = intr[i].pri;
} else {
const unsigned int *irq =
of_get_property(dp, "interrupts", &len);
if (irq) {
op->num_irqs = len / sizeof(unsigned int);
for (i = 0; i < op->num_irqs; i++)
op->irqs[i] = irq[i];
} else {
op->num_irqs = 0;
}
}
if (sparc_cpu_model == sun4d) {
static int pil_to_sbus[] = {
0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
};
struct device_node *io_unit, *sbi = dp->parent;
const struct linux_prom_registers *regs;
int board, slot;
while (sbi) {
if (!strcmp(sbi->name, "sbi"))
break;
sbi = sbi->parent;
}
if (!sbi)
goto build_resources;
regs = of_get_property(dp, "reg", NULL);
if (!regs)
goto build_resources;
slot = regs->which_io;
/* If SBI's parent is not io-unit or the io-unit lacks
* a "board#" property, something is very wrong.
*/
if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
printk("%s: Error, parent is not io-unit.\n",
sbi->full_name);
goto build_resources;
}
io_unit = sbi->parent;
board = of_getintprop_default(io_unit, "board#", -1);
if (board == -1) {
printk("%s: Error, lacks board# property.\n",
io_unit->full_name);
goto build_resources;
}
for (i = 0; i < op->num_irqs; i++) {
int this_irq = op->irqs[i];
int sbusl = pil_to_sbus[this_irq];
if (sbusl)
this_irq = (((board + 1) << 5) +
(sbusl << 2) +
slot);
op->irqs[i] = this_irq;
}
}
build_resources:
build_device_resources(op, parent);
op->dev.parent = parent;
op->dev.bus = &of_platform_bus_type;
if (!parent)
strcpy(op->dev.bus_id, "root");
else
sprintf(op->dev.bus_id, "%08x", dp->node);
if (of_device_register(op)) {
printk("%s: Could not register of device.\n",
dp->full_name);
kfree(op);
op = NULL;
}
return op;
}
static void __init scan_tree(struct device_node *dp, struct device *parent)
{
while (dp) {
struct of_device *op = scan_one_device(dp, parent);
if (op)
scan_tree(dp->child, &op->dev);
dp = dp->sibling;
}
}
static void __init scan_of_devices(void)
{
struct device_node *root = of_find_node_by_path("/");
struct of_device *parent;
parent = scan_one_device(root, NULL);
if (!parent)
return;
scan_tree(root->child, &parent->dev);
}
static int __init of_bus_driver_init(void)
{
int err;
err = of_bus_type_init(&of_platform_bus_type, "of");
if (!err)
scan_of_devices();
return err;
}
postcore_initcall(of_bus_driver_init);
static int __init of_debug(char *str)
{
int val = 0;
get_option(&str, &val);
if (val & 1)
of_resource_verbose = 1;
return 1;
}
__setup("of_debug=", of_debug);
