linux-sg2042/arch/x86/kernel/devicetree.c

442 lines
8.7 KiB
C

/*
* Architecture specific OF callbacks.
*/
#include <linux/bootmem.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/of_pci.h>
#include <asm/hpet.h>
#include <asm/irq_controller.h>
#include <asm/apic.h>
#include <asm/pci_x86.h>
__initdata u64 initial_dtb;
char __initdata cmd_line[COMMAND_LINE_SIZE];
static LIST_HEAD(irq_domains);
static DEFINE_RAW_SPINLOCK(big_irq_lock);
int __initdata of_ioapic;
#ifdef CONFIG_X86_IO_APIC
static void add_interrupt_host(struct irq_domain *ih)
{
unsigned long flags;
raw_spin_lock_irqsave(&big_irq_lock, flags);
list_add(&ih->l, &irq_domains);
raw_spin_unlock_irqrestore(&big_irq_lock, flags);
}
#endif
static struct irq_domain *get_ih_from_node(struct device_node *controller)
{
struct irq_domain *ih, *found = NULL;
unsigned long flags;
raw_spin_lock_irqsave(&big_irq_lock, flags);
list_for_each_entry(ih, &irq_domains, l) {
if (ih->controller == controller) {
found = ih;
break;
}
}
raw_spin_unlock_irqrestore(&big_irq_lock, flags);
return found;
}
unsigned int irq_create_of_mapping(struct device_node *controller,
const u32 *intspec, unsigned int intsize)
{
struct irq_domain *ih;
u32 virq, type;
int ret;
ih = get_ih_from_node(controller);
if (!ih)
return 0;
ret = ih->xlate(ih, intspec, intsize, &virq, &type);
if (ret)
return 0;
if (type == IRQ_TYPE_NONE)
return virq;
irq_set_irq_type(virq, type);
return virq;
}
EXPORT_SYMBOL_GPL(irq_create_of_mapping);
unsigned long pci_address_to_pio(phys_addr_t address)
{
/*
* The ioport address can be directly used by inX / outX
*/
BUG_ON(address >= (1 << 16));
return (unsigned long)address;
}
EXPORT_SYMBOL_GPL(pci_address_to_pio);
void __init early_init_dt_scan_chosen_arch(unsigned long node)
{
BUG();
}
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
BUG();
}
void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
{
return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
}
void __init add_dtb(u64 data)
{
initial_dtb = data + offsetof(struct setup_data, data);
}
/*
* CE4100 ids. Will be moved to machine_device_initcall() once we have it.
*/
static struct of_device_id __initdata ce4100_ids[] = {
{ .compatible = "intel,ce4100-cp", },
{ .compatible = "isa", },
{ .compatible = "pci", },
{},
};
static int __init add_bus_probe(void)
{
if (!of_have_populated_dt())
return 0;
return of_platform_bus_probe(NULL, ce4100_ids, NULL);
}
module_init(add_bus_probe);
#ifdef CONFIG_PCI
static int x86_of_pci_irq_enable(struct pci_dev *dev)
{
struct of_irq oirq;
u32 virq;
int ret;
u8 pin;
ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (ret)
return ret;
if (!pin)
return 0;
ret = of_irq_map_pci(dev, &oirq);
if (ret)
return ret;
virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
oirq.size);
if (virq == 0)
return -EINVAL;
dev->irq = virq;
return 0;
}
static void x86_of_pci_irq_disable(struct pci_dev *dev)
{
}
void __cpuinit x86_of_pci_init(void)
{
struct device_node *np;
pcibios_enable_irq = x86_of_pci_irq_enable;
pcibios_disable_irq = x86_of_pci_irq_disable;
for_each_node_by_type(np, "pci") {
const void *prop;
struct pci_bus *bus;
unsigned int bus_min;
struct device_node *child;
prop = of_get_property(np, "bus-range", NULL);
if (!prop)
continue;
bus_min = be32_to_cpup(prop);
bus = pci_find_bus(0, bus_min);
if (!bus) {
printk(KERN_ERR "Can't find a node for bus %s.\n",
np->full_name);
continue;
}
if (bus->self)
bus->self->dev.of_node = np;
else
bus->dev.of_node = np;
for_each_child_of_node(np, child) {
struct pci_dev *dev;
u32 devfn;
prop = of_get_property(child, "reg", NULL);
if (!prop)
continue;
devfn = (be32_to_cpup(prop) >> 8) & 0xff;
dev = pci_get_slot(bus, devfn);
if (!dev)
continue;
dev->dev.of_node = child;
pci_dev_put(dev);
}
}
}
#endif
static void __init dtb_setup_hpet(void)
{
#ifdef CONFIG_HPET_TIMER
struct device_node *dn;
struct resource r;
int ret;
dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
if (!dn)
return;
ret = of_address_to_resource(dn, 0, &r);
if (ret) {
WARN_ON(1);
return;
}
hpet_address = r.start;
#endif
}
static void __init dtb_lapic_setup(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
struct device_node *dn;
struct resource r;
int ret;
dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
if (!dn)
return;
ret = of_address_to_resource(dn, 0, &r);
if (WARN_ON(ret))
return;
/* Did the boot loader setup the local APIC ? */
if (!cpu_has_apic) {
if (apic_force_enable(r.start))
return;
}
smp_found_config = 1;
pic_mode = 1;
register_lapic_address(r.start);
generic_processor_info(boot_cpu_physical_apicid,
GET_APIC_VERSION(apic_read(APIC_LVR)));
#endif
}
#ifdef CONFIG_X86_IO_APIC
static unsigned int ioapic_id;
static void __init dtb_add_ioapic(struct device_node *dn)
{
struct resource r;
int ret;
ret = of_address_to_resource(dn, 0, &r);
if (ret) {
printk(KERN_ERR "Can't obtain address from node %s.\n",
dn->full_name);
return;
}
mp_register_ioapic(++ioapic_id, r.start, gsi_top);
}
static void __init dtb_ioapic_setup(void)
{
struct device_node *dn;
for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
dtb_add_ioapic(dn);
if (nr_ioapics) {
of_ioapic = 1;
return;
}
printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
}
#else
static void __init dtb_ioapic_setup(void) {}
#endif
static void __init dtb_apic_setup(void)
{
dtb_lapic_setup();
dtb_ioapic_setup();
}
#ifdef CONFIG_OF_FLATTREE
static void __init x86_flattree_get_config(void)
{
u32 size, map_len;
void *new_dtb;
if (!initial_dtb)
return;
map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK),
(u64)sizeof(struct boot_param_header));
initial_boot_params = early_memremap(initial_dtb, map_len);
size = be32_to_cpu(initial_boot_params->totalsize);
if (map_len < size) {
early_iounmap(initial_boot_params, map_len);
initial_boot_params = early_memremap(initial_dtb, size);
map_len = size;
}
new_dtb = alloc_bootmem(size);
memcpy(new_dtb, initial_boot_params, size);
early_iounmap(initial_boot_params, map_len);
initial_boot_params = new_dtb;
/* root level address cells */
of_scan_flat_dt(early_init_dt_scan_root, NULL);
unflatten_device_tree();
}
#else
static inline void x86_flattree_get_config(void) { }
#endif
void __init x86_dtb_init(void)
{
x86_flattree_get_config();
if (!of_have_populated_dt())
return;
dtb_setup_hpet();
dtb_apic_setup();
}
#ifdef CONFIG_X86_IO_APIC
struct of_ioapic_type {
u32 out_type;
u32 trigger;
u32 polarity;
};
static struct of_ioapic_type of_ioapic_type[] =
{
{
.out_type = IRQ_TYPE_EDGE_RISING,
.trigger = IOAPIC_EDGE,
.polarity = 1,
},
{
.out_type = IRQ_TYPE_LEVEL_LOW,
.trigger = IOAPIC_LEVEL,
.polarity = 0,
},
{
.out_type = IRQ_TYPE_LEVEL_HIGH,
.trigger = IOAPIC_LEVEL,
.polarity = 1,
},
{
.out_type = IRQ_TYPE_EDGE_FALLING,
.trigger = IOAPIC_EDGE,
.polarity = 0,
},
};
static int ioapic_xlate(struct irq_domain *id, const u32 *intspec, u32 intsize,
u32 *out_hwirq, u32 *out_type)
{
struct mp_ioapic_gsi *gsi_cfg;
struct io_apic_irq_attr attr;
struct of_ioapic_type *it;
u32 line, idx, type;
if (intsize < 2)
return -EINVAL;
line = *intspec;
idx = (u32) id->priv;
gsi_cfg = mp_ioapic_gsi_routing(idx);
*out_hwirq = line + gsi_cfg->gsi_base;
intspec++;
type = *intspec;
if (type >= ARRAY_SIZE(of_ioapic_type))
return -EINVAL;
it = of_ioapic_type + type;
*out_type = it->out_type;
set_io_apic_irq_attr(&attr, idx, line, it->trigger, it->polarity);
return io_apic_setup_irq_pin_once(*out_hwirq, cpu_to_node(0), &attr);
}
static void __init ioapic_add_ofnode(struct device_node *np)
{
struct resource r;
int i, ret;
ret = of_address_to_resource(np, 0, &r);
if (ret) {
printk(KERN_ERR "Failed to obtain address for %s\n",
np->full_name);
return;
}
for (i = 0; i < nr_ioapics; i++) {
if (r.start == mpc_ioapic_addr(i)) {
struct irq_domain *id;
id = kzalloc(sizeof(*id), GFP_KERNEL);
BUG_ON(!id);
id->controller = np;
id->xlate = ioapic_xlate;
id->priv = (void *)i;
add_interrupt_host(id);
return;
}
}
printk(KERN_ERR "IOxAPIC at %s is not registered.\n", np->full_name);
}
void __init x86_add_irq_domains(void)
{
struct device_node *dp;
if (!of_have_populated_dt())
return;
for_each_node_with_property(dp, "interrupt-controller") {
if (of_device_is_compatible(dp, "intel,ce4100-ioapic"))
ioapic_add_ofnode(dp);
}
}
#else
void __init x86_add_irq_domains(void) { }
#endif