Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * linux/arch/m68k/sun3/dvma.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Written by Sam Creasey
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Sun3 IOMMU routines used for dvma accesses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/sun3mmu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/dvma.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static unsigned long ptelist[120];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	unsigned long pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	unsigned long j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	pte_t ptep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	j = *(volatile unsigned long *)kaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	*(volatile unsigned long *)kaddr = j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	ptep = pfn_pte(virt_to_pfn(kaddr), PAGE_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	pte = pte_val(ptep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) //	pr_info("dvma_remap: addr %lx -> %lx pte %08lx\n", kaddr, vaddr, pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		sun3_put_pte(vaddr, pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] = pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	return (vaddr + (kaddr & ~PAGE_MASK));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 			      int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	unsigned long end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	unsigned long vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	vaddr = dvma_btov(baddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	end = vaddr + len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	while(vaddr < end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		dvma_page(kaddr, vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		kaddr += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 		vaddr += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) void __init sun3_dvma_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	memset(ptelist, 0, sizeof(ptelist));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }