/*
* Map a set of physical memory pages into the kernel virtual address space.
* Return a pointer to where it is mapped.
*
* This uses a pre-established static mapping if one exists for the requested
* range, otherwise it allocates kva space and maps the physical pages into it.
*
* This routine is intended to be used for mapping device memory, NOT real
* memory; the mapping type is inherently VM_MEMATTR_DEVICE in
* pmap_kenter_device().
*/
void *
pmap_mapdev(vm_offset_t pa, vm_size_t size)
{
vm_offset_t va, offset;
void * rva;
/* First look in the static mapping table. */
if ((rva = devmap_ptov(pa, size)) != NULL)
return (rva);
offset = pa & PAGE_MASK;
pa = trunc_page(pa);
size = round_page(size + offset);
#if defined(__aarch64__) || defined(__riscv__)
if (early_boot) {
akva_devmap_vaddr = trunc_page(akva_devmap_vaddr - size);
va = akva_devmap_vaddr;
KASSERT(va >= VM_MAX_KERNEL_ADDRESS - L2_SIZE,
("Too many early devmap mappings"));
} else
#endif
va = kva_alloc(size);
if (!va)
panic("pmap_mapdev: Couldn't alloc kernel virtual memory");
pmap_kenter_device(va, size, pa);
return ((void *)(va + offset));
}
void
platform_gpio_init(void)
{
/*
* The UART console driver used for debugging early boot code
* needs to know the virtual base address of the aobus. It's
* expected to equal SOCDEV_VA prior to initarm calling setttb
* ... afterwards it needs to be updated due to the new page
* tables.
*
* This means there's a deadzone in initarm between setttb
* and platform_gpio_init during which printf can't be used.
*/
aml8726_aobus_kva_base =
(vm_offset_t)devmap_ptov(0xc8100000, 0x100000);
/*
* The hardware mux used by clkmsr is unique to the SoC (though
* currently clk81 is at a fixed location, however that might
* change in the future).
*/
aml8726_identify_soc();
/*
* My aml8726-m3 development box which identifies the CPU as
* a Cortex A9-r2 rev 4 randomly locks up during boot when WFI
* is used.
*/
switch (aml8726_soc_hw_rev) {
case AML_SOC_HW_REV_M3:
cpufuncs.cf_sleep = (void *)cpufunc_nullop;
break;
default:
break;
}
/*
* This FDT fixup should arguably be called through fdt_fixup_table,
* however currently there's no mechanism to specify a fixup which
* should always be invoked.
*
* It needs to be called prior to the console being initialized which
* is why it's called here, rather than from platform_late_init.
*/
aml8726_fixup_busfreq();
}