1 // SPDX-License-Identifier: GPL-2.0+
3  * FDT Address translation based on u-boot fdt_support.c which in turn was
9  * Copyright 2010-2011 Freescale Semiconductor, Inc.
27 static void __init of_dump_addr(const char *s, const __be32 *addr, int na)  in of_dump_addr()  argument
30 	while(na--)  in of_dump_addr()
31 		pr_cont(" %08x", *(addr++));  in of_dump_addr()
35 static void __init of_dump_addr(const char *s, const __be32 *addr, int na) { }  in of_dump_addr()  argument
38 /* Callbacks for bus specific translators */
42 	u64		(*map)(__be32 *addr, const __be32 *range,
44 	int		(*translate)(__be32 *addr, u64 offset, int na);
47 /* Default translator (generic bus) */
54 		prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL);  in fdt_bus_default_count_cells()
62 		prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);  in fdt_bus_default_count_cells()
70 static u64 __init fdt_bus_default_map(__be32 *addr, const __be32 *range,  in fdt_bus_default_map()  argument
77 	da = of_read_number(addr, na);  in fdt_bus_default_map()
84 	return da - cp;  in fdt_bus_default_map()
87 static int __init fdt_bus_default_translate(__be32 *addr, u64 offset, int na)  in fdt_bus_default_translate()  argument
89 	u64 a = of_read_number(addr, na);  in fdt_bus_default_translate()
90 	memset(addr, 0, na * 4);  in fdt_bus_default_translate()
93 		addr[na - 2] = cpu_to_fdt32(a >> 32);  in fdt_bus_default_translate()
94 	addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);  in fdt_bus_default_translate()
99 /* Array of bus specific translators */
110 				    const struct of_bus *bus,  in fdt_translate_one()  argument
111 				    const struct of_bus *pbus, __be32 *addr,  in fdt_translate_one()  argument
123 		offset = of_read_number(addr, na);  in fdt_translate_one()
124 		memset(addr, 0, pna * 4);  in fdt_translate_one()
134 	for (; rlen >= rone; rlen -= rone, ranges += rone) {  in fdt_translate_one()
135 		offset = bus->map(addr, ranges, na, ns, pna);  in fdt_translate_one()
143 	memcpy(addr, ranges + na, 4 * pna);  in fdt_translate_one()
146 	of_dump_addr("parent translation for:", addr, pna);  in fdt_translate_one()
149 	/* Translate it into parent bus space */  in fdt_translate_one()
150 	return pbus->translate(addr, offset, pna);  in fdt_translate_one()
154  * Translate an address from the device-tree into a CPU physical address,
155  * this walks up the tree and applies the various bus mappings on the
158  * Note: We consider that crossing any level with #size-cells == 0 to mean
166 	const struct of_bus *bus, *pbus;  in fdt_translate_address()  local
168 	__be32 addr[OF_MAX_ADDR_CELLS];  in fdt_translate_address()  local
182 	/* Get parent & match bus type */  in fdt_translate_address()
186 	bus = &of_busses[0];  in fdt_translate_address()
189 	bus->count_cells(blob, parent, &na, &ns);  in fdt_translate_address()
195 	memcpy(addr, reg, na * 4);  in fdt_translate_address()
197 	pr_debug("bus (na=%d, ns=%d) on %s\n",  in fdt_translate_address()
199 	of_dump_addr("translating address:", addr, na);  in fdt_translate_address()
203 		/* Switch to parent bus */  in fdt_translate_address()
210 			result = of_read_number(addr, na);  in fdt_translate_address()
214 		/* Get new parent bus and counts */  in fdt_translate_address()
216 		pbus->count_cells(blob, parent, &pna, &pns);  in fdt_translate_address()
223 		pr_debug("parent bus (na=%d, ns=%d) on %s\n",  in fdt_translate_address()
226 		/* Apply bus translation */  in fdt_translate_address()
227 		if (fdt_translate_one(blob, node_offset, bus, pbus,  in fdt_translate_address()
228 					addr, na, ns, pna, "ranges"))  in fdt_translate_address()
234 		bus = pbus;  in fdt_translate_address()
236 		of_dump_addr("one level translation:", addr, na);  in fdt_translate_address()
243  * of_flat_dt_translate_address - translate DT addr into CPU phys addr