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MIPS: Loongson64: Process ISA Node in DeviceTree

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Previously, we're hardcoding reserved ISA I/O Space in, now
we're processing it I/O via DeviceTree directly.
The ranges property if ISA node is used to determine the size and address
of reserved I/O space.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Jiaxun Yang 2020-07-28 23:36:56 +08:00 committed by Thomas Bogendoerfer
parent 2f96593ecc
commit 6d0068ad15
1 changed files with 60 additions and 23 deletions
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83
arch/mips/loongson64/init.c
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@ -7,6 +7,8 @@
#include <linux/irqchip.h>
#include <linux/logic_pio.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <asm/bootinfo.h>
#include <asm/traps.h>
#include <asm/smp-ops.h>
@ -63,41 +65,76 @@ void __init prom_free_prom_memory(void)
{
}
static __init void reserve_pio_range(void)
static int __init add_legacy_isa_io(struct fwnode_handle *fwnode, resource_size_t hw_start,
resource_size_t size)
{
int ret = 0;
struct logic_pio_hwaddr *range;
unsigned long vaddr;
range = kzalloc(sizeof(*range), GFP_ATOMIC);
if (!range)
return;
return -ENOMEM;
range->fwnode = &of_root->fwnode;
range->size = MMIO_LOWER_RESERVED;
range->hw_start = LOONGSON_PCIIO_BASE;
range->fwnode = fwnode;
range->size = size;
range->hw_start = hw_start;
range->flags = LOGIC_PIO_CPU_MMIO;
if (logic_pio_register_range(range)) {
pr_err("Failed to reserve PIO range for legacy ISA\n");
goto free_range;
ret = logic_pio_register_range(range);
if (ret) {
kfree(range);
return ret;
}
if (WARN(range->io_start != 0,
"Reserved PIO range does not start from 0\n"))
goto unregister;
/* Legacy ISA must placed at the start of PCI_IOBASE */
if (range->io_start != 0) {
logic_pio_unregister_range(range);
kfree(range);
return -EINVAL;
}
/*
* i8259 would access I/O space, so mapping must be done here.
* Please remove it when all drivers can be managed by logic_pio.
*/
ioremap_page_range(PCI_IOBASE, PCI_IOBASE + MMIO_LOWER_RESERVED,
LOONGSON_PCIIO_BASE,
pgprot_device(PAGE_KERNEL));
vaddr = PCI_IOBASE + range->io_start;
return;
unregister:
logic_pio_unregister_range(range);
free_range:
kfree(range);
ioremap_page_range(vaddr, vaddr + size, hw_start, pgprot_device(PAGE_KERNEL));
return 0;
}
static __init void reserve_pio_range(void)
{
struct device_node *np;
for_each_node_by_name(np, "isa") {
struct of_range range;
struct of_range_parser parser;
pr_info("ISA Bridge: %pOF\n", np);
if (of_range_parser_init(&parser, np)) {
pr_info("Failed to parse resources.\n");
break;
}
for_each_of_range(&parser, &range) {
switch (range.flags & IORESOURCE_TYPE_BITS) {
case IORESOURCE_IO:
pr_info(" IO 0x%016llx..0x%016llx -> 0x%016llx\n",
range.cpu_addr,
range.cpu_addr + range.size - 1,
range.bus_addr);
if (add_legacy_isa_io(&np->fwnode, range.cpu_addr, range.size))
pr_warn("Failed to reserve legacy IO in Logic PIO\n");
break;
case IORESOURCE_MEM:
pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx\n",
range.cpu_addr,
range.cpu_addr + range.size - 1,
range.bus_addr);
break;
}
}
}
}
void __init arch_init_irq(void)