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) /* memory.c: Prom routine for acquiring various bits of information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *           about RAM on the machine, both virtual and physical.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/sort.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/openprom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/oplib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static int __init prom_meminit_v0(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	struct linux_mlist_v0 *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		sp_banks[index].base_addr = (unsigned long) p->start_adr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		sp_banks[index].num_bytes = p->num_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		index++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	return index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static int __init prom_meminit_v2(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	struct linux_prom_registers reg[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	phandle node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	int size, num_ents, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	node = prom_searchsiblings(prom_getchild(prom_root_node), "memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	size = prom_getproperty(node, "available", (char *) reg, sizeof(reg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	num_ents = size / sizeof(struct linux_prom_registers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	for (i = 0; i < num_ents; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		sp_banks[i].base_addr = reg[i].phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		sp_banks[i].num_bytes = reg[i].reg_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	return num_ents;
^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) static int sp_banks_cmp(const void *a, const void *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	const struct sparc_phys_banks *x = a, *y = b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	if (x->base_addr > y->base_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	if (x->base_addr < y->base_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	return 0;
^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) /* Initialize the memory lists based upon the prom version. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) void __init prom_meminit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	int i, num_ents = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	switch (prom_vers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	case PROM_V0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 		num_ents = prom_meminit_v0();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	case PROM_V2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	case PROM_V3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 		num_ents = prom_meminit_v2();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	     sp_banks_cmp, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 	/* Sentinel.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	sp_banks[num_ents].base_addr = 0xdeadbeef;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 	sp_banks[num_ents].num_bytes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 	for (i = 0; i < num_ents; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 		sp_banks[i].num_bytes &= PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }