Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * arch/sh/mm/kmap.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Copyright (C) 2002 - 2009  Paul Mundt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/mmu_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static pte_t *kmap_coherent_pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) void __init kmap_coherent_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	unsigned long vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	/* cache the first coherent kmap pte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	kmap_coherent_pte = virt_to_kpte(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) void *kmap_coherent(struct page *page, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	enum fixed_addresses idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	unsigned long vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	BUG_ON(!test_bit(PG_dcache_clean, &page->flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	pagefault_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	idx = FIX_CMAP_END -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		(((addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1)) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		 (FIX_N_COLOURS * smp_processor_id()));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	vaddr = __fix_to_virt(idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	BUG_ON(!pte_none(*(kmap_coherent_pte - idx)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	set_pte(kmap_coherent_pte - idx, mk_pte(page, PAGE_KERNEL));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	return (void *)vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) void kunmap_coherent(void *kvaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	if (kvaddr >= (void *)FIXADDR_START) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		unsigned long vaddr = (unsigned long)kvaddr & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		enum fixed_addresses idx = __virt_to_fix(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		/* XXX.. Kill this later, here for sanity at the moment.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		__flush_purge_region((void *)vaddr, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		pte_clear(&init_mm, vaddr, kmap_coherent_pte - idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 		local_flush_tlb_one(get_asid(), vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	pagefault_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }