mirror of https://gitee.com/openkylin/linux.git
614 lines
12 KiB
C
614 lines
12 KiB
C
#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);
|
|
|
|
#ifdef CONFIG_PCI
|
|
struct bus_type ebus_bus_type;
|
|
EXPORT_SYMBOL(ebus_bus_type);
|
|
#endif
|
|
|
|
#ifdef CONFIG_SBUS
|
|
struct bus_type sbus_bus_type;
|
|
EXPORT_SYMBOL(sbus_bus_type);
|
|
#endif
|
|
|
|
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 int (*get_flags)(const u32 *addr);
|
|
};
|
|
|
|
/*
|
|
* 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 int of_bus_default_get_flags(const u32 *addr)
|
|
{
|
|
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 int of_bus_pci_get_flags(const u32 *addr)
|
|
{
|
|
unsigned int flags = 0;
|
|
u32 w = addr[0];
|
|
|
|
switch((w >> 24) & 0x03) {
|
|
case 0x01:
|
|
flags |= IORESOURCE_IO;
|
|
case 0x02: /* 32 bits */
|
|
case 0x03: /* 64 bits */
|
|
flags |= IORESOURCE_MEM;
|
|
}
|
|
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 int of_bus_sbus_get_flags(const u32 *addr)
|
|
{
|
|
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 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);
|
|
flags = bus->get_flags(reg);
|
|
|
|
memcpy(addr, reg, na * 4);
|
|
|
|
/* If the immediate parent has no ranges property to apply,
|
|
* just use a 1<->1 mapping.
|
|
*/
|
|
if (of_find_property(pp, "ranges", NULL) == NULL) {
|
|
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;
|
|
|
|
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");
|
|
#ifdef CONFIG_PCI
|
|
if (!err)
|
|
err = of_bus_type_init(&ebus_bus_type, "ebus");
|
|
#endif
|
|
#ifdef CONFIG_SBUS
|
|
if (!err)
|
|
err = of_bus_type_init(&sbus_bus_type, "sbus");
|
|
#endif
|
|
|
|
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);
|
|
|
|
struct of_device* of_platform_device_create(struct device_node *np,
|
|
const char *bus_id,
|
|
struct device *parent,
|
|
struct bus_type *bus)
|
|
{
|
|
struct of_device *dev;
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
dev->dev.parent = parent;
|
|
dev->dev.bus = bus;
|
|
dev->dev.release = of_release_dev;
|
|
|
|
strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
|
|
|
|
if (of_device_register(dev) != 0) {
|
|
kfree(dev);
|
|
return NULL;
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
|
|
EXPORT_SYMBOL(of_platform_device_create);
|