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[Deepin-Kernel-SIG] [linux 6.6.y] [deepin] LoongArch: legacyboot: BPI: workaround old firmware with ISA #1631

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[Deepin-Kernel-SIG] [linux 6.6.y] [deepin] LoongArch: legacyboot: BPI: workaround old firmware with ISA #1631

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44 changes: 44 additions & 0 deletions arch/loongarch/kernel/legacy_boot.c
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Original file line number Diff line number Diff line change
Expand Up @@ -718,3 +718,47 @@ void __init acpi_arch_init (void){
int loongarch_have_legacy_bpi (void){
return have_bpi;
}

static int __init add_legacy_isa_io(struct fwnode_handle *fwnode, unsigned long isa_base)
{
int ret = 0;
unsigned long vaddr;
struct logic_pio_hwaddr *range;
range = kzalloc(sizeof(*range), GFP_ATOMIC);
if (!range)
return -ENOMEM;
range->fwnode = fwnode;
range->size = ISA_IOSIZE;
range->hw_start = isa_base;
range->flags = LOGIC_PIO_CPU_MMIO;
ret = logic_pio_register_range(range);
if (ret) {
kfree(range);
return ret;
}
if (range->io_start != 0) {
logic_pio_unregister_range(range);
kfree(range);
return -EINVAL;
}
vaddr = (unsigned long)(PCI_IOBASE + range->io_start);
ret = ioremap_page_range(vaddr, vaddr + range->size, range->hw_start,
pgprot_device(PAGE_KERNEL));
return ret;
}

#define ISA_PHY_IOBASE LOONGSON_LIO_BASE
static int __init acpi_register_legacy_isa_io(void)
{
struct fwnode_handle *fwnode;
u64 cpu_addr;
if (!acpi_disabled) {
cpu_addr = ISA_PHY_IOBASE;
fwnode = kzalloc(sizeof(*fwnode), GFP_ATOMIC);
}

if (fwnode)
add_legacy_isa_io(fwnode, cpu_addr);
return 0;
}
arch_initcall(acpi_register_legacy_isa_io);
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