linux/arch/x86/kernel/devicetree.c

388 lines
7.7 KiB
C

/*
* Architecture specific OF callbacks.
*/
#include <linux/bootmem.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/irqdomain.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 <linux/initrd.h>
#include <asm/hpet.h>
#include <asm/apic.h>
#include <asm/pci_x86.h>
#include <asm/setup.h>
__initdata u64 initial_dtb;
char __initdata cmd_line[COMMAND_LINE_SIZE];
int __initdata of_ioapic;
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
struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
{
struct device_node *np;
for_each_node_by_type(np, "pci") {
const void *prop;
unsigned int bus_min;
prop = of_get_property(np, "bus-range", NULL);
if (!prop)
continue;
bus_min = be32_to_cpup(prop);
if (bus->number == bus_min)
return np;
}
return NULL;
}
static int x86_of_pci_irq_enable(struct pci_dev *dev)
{
u32 virq;
int ret;
u8 pin;
ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (ret)
return ret;
if (!pin)
return 0;
virq = of_irq_parse_and_map_pci(dev, 0, 0);
if (virq == 0)
return -EINVAL;
dev->irq = virq;
return 0;
}
static void x86_of_pci_irq_disable(struct pci_dev *dev)
{
}
void x86_of_pci_init(void)
{
pcibios_enable_irq = x86_of_pci_irq_enable;
pcibios_disable_irq = x86_of_pci_irq_disable;
}
#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;
struct boot_param_header *dt;
if (!initial_dtb)
return;
map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK),
(u64)sizeof(struct boot_param_header));
dt = early_memremap(initial_dtb, map_len);
size = be32_to_cpu(dt->totalsize);
if (map_len < size) {
early_iounmap(dt, map_len);
dt = early_memremap(initial_dtb, size);
map_len = size;
}
initial_boot_params = dt;
unflatten_and_copy_device_tree();
early_iounmap(dt, map_len);
}
#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 *domain,
struct device_node *controller,
const u32 *intspec, u32 intsize,
irq_hw_number_t *out_hwirq, u32 *out_type)
{
struct io_apic_irq_attr attr;
struct of_ioapic_type *it;
u32 line, idx;
int rc;
if (WARN_ON(intsize < 2))
return -EINVAL;
line = intspec[0];
if (intspec[1] >= ARRAY_SIZE(of_ioapic_type))
return -EINVAL;
it = &of_ioapic_type[intspec[1]];
idx = (u32) domain->host_data;
set_io_apic_irq_attr(&attr, idx, line, it->trigger, it->polarity);
rc = io_apic_setup_irq_pin_once(irq_find_mapping(domain, line),
cpu_to_node(0), &attr);
if (rc)
return rc;
*out_hwirq = line;
*out_type = it->out_type;
return 0;
}
const struct irq_domain_ops ioapic_irq_domain_ops = {
.xlate = ioapic_xlate,
};
static void dt_add_ioapic_domain(unsigned int ioapic_num,
struct device_node *np)
{
struct irq_domain *id;
struct mp_ioapic_gsi *gsi_cfg;
int ret;
int num;
gsi_cfg = mp_ioapic_gsi_routing(ioapic_num);
num = gsi_cfg->gsi_end - gsi_cfg->gsi_base + 1;
id = irq_domain_add_linear(np, num, &ioapic_irq_domain_ops,
(void *)ioapic_num);
BUG_ON(!id);
if (gsi_cfg->gsi_base == 0) {
/*
* The first NR_IRQS_LEGACY irq descs are allocated in
* early_irq_init() and need just a mapping. The
* remaining irqs need both. All of them are preallocated
* and assigned so we can keep the 1:1 mapping which the ioapic
* is having.
*/
irq_domain_associate_many(id, 0, 0, NR_IRQS_LEGACY);
if (num > NR_IRQS_LEGACY) {
ret = irq_create_strict_mappings(id, NR_IRQS_LEGACY,
NR_IRQS_LEGACY, num - NR_IRQS_LEGACY);
if (ret)
pr_err("Error creating mapping for the "
"remaining IRQs: %d\n", ret);
}
irq_set_default_host(id);
} else {
ret = irq_create_strict_mappings(id, gsi_cfg->gsi_base, 0, num);
if (ret)
pr_err("Error creating IRQ mapping: %d\n", ret);
}
}
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)) {
dt_add_ioapic_domain(i, np);
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