forked from ~ljy/RK356X_SDK_RELEASE
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hc
2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/of/address.c
....@@ -13,6 +13,9 @@
1313 #include <linux/sizes.h>
1414 #include <linux/slab.h>
1515 #include <linux/string.h>
16
+#include <linux/dma-direct.h> /* for bus_dma_region */
17
+
18
+#include "of_private.h"
1619 
1720 /* Max address size we deal with */
1821 #define OF_MAX_ADDR_CELLS	4
....@@ -47,6 +50,7 @@
4750 	u64		(*map)(__be32 *addr, const __be32 *range,
4851 				int na, int ns, int pna);
4952 	int		(*translate)(__be32 *addr, u64 offset, int na);
53
+	bool	has_flags;
5054 	unsigned int	(*get_flags)(const __be32 *addr);
5155 };
5256 
....@@ -99,34 +103,13 @@
99103 }
100104 
101105 #ifdef CONFIG_PCI
102
-/*
103
- * PCI bus specific translator
104
- */
105
-
106
-static int of_bus_pci_match(struct device_node *np)
107
-{
108
-	/*
109
- 	 * "pciex" is PCI Express
110
-	 * "vci" is for the /chaos bridge on 1st-gen PCI powermacs
111
-	 * "ht" is hypertransport
112
-	 */
113
-	return !strcmp(np->type, "pci") || !strcmp(np->type, "pciex") ||
114
-		!strcmp(np->type, "vci") || !strcmp(np->type, "ht");
115
-}
116
-
117
-static void of_bus_pci_count_cells(struct device_node *np,
118
-				   int *addrc, int *sizec)
119
-{
120
-	if (addrc)
121
-		*addrc = 3;
122
-	if (sizec)
123
-		*sizec = 2;
124
-}
125
-
126106 static unsigned int of_bus_pci_get_flags(const __be32 *addr)
127107 {
128108 	unsigned int flags = 0;
129109 	u32 w = be32_to_cpup(addr);
110
+
111
+	if (!IS_ENABLED(CONFIG_PCI))
112
+		return 0;
130113 
131114 	switch((w >> 24) & 0x03) {
132115 	case 0x01:
....@@ -140,6 +123,44 @@
140123 	if (w & 0x40000000)
141124 		flags |= IORESOURCE_PREFETCH;
142125 	return flags;
126
+}
127
+
128
+/*
129
+ * PCI bus specific translator
130
+ */
131
+
132
+static bool of_node_is_pcie(struct device_node *np)
133
+{
134
+	bool is_pcie = of_node_name_eq(np, "pcie");
135
+
136
+	if (is_pcie)
137
+		pr_warn_once("%pOF: Missing device_type\n", np);
138
+
139
+	return is_pcie;
140
+}
141
+
142
+static int of_bus_pci_match(struct device_node *np)
143
+{
144
+	/*
145
+ 	 * "pciex" is PCI Express
146
+	 * "vci" is for the /chaos bridge on 1st-gen PCI powermacs
147
+	 * "ht" is hypertransport
148
+	 *
149
+	 * If none of the device_type match, and that the node name is
150
+	 * "pcie", accept the device as PCI (with a warning).
151
+	 */
152
+	return of_node_is_type(np, "pci") || of_node_is_type(np, "pciex") ||
153
+		of_node_is_type(np, "vci") || of_node_is_type(np, "ht") ||
154
+		of_node_is_pcie(np);
155
+}
156
+
157
+static void of_bus_pci_count_cells(struct device_node *np,
158
+				   int *addrc, int *sizec)
159
+{
160
+	if (addrc)
161
+		*addrc = 3;
162
+	if (sizec)
163
+		*sizec = 2;
143164 }
144165 
145166 static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns,
....@@ -232,84 +253,6 @@
232253 }
233254 EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
234255 
235
-static int parser_init(struct of_pci_range_parser *parser,
236
-			struct device_node *node, const char *name)
237
-{
238
-	const int na = 3, ns = 2;
239
-	int rlen;
240
-
241
-	parser->node = node;
242
-	parser->pna = of_n_addr_cells(node);
243
-	parser->np = parser->pna + na + ns;
244
-
245
-	parser->range = of_get_property(node, name, &rlen);
246
-	if (parser->range == NULL)
247
-		return -ENOENT;
248
-
249
-	parser->end = parser->range + rlen / sizeof(__be32);
250
-
251
-	return 0;
252
-}
253
-
254
-int of_pci_range_parser_init(struct of_pci_range_parser *parser,
255
-				struct device_node *node)
256
-{
257
-	return parser_init(parser, node, "ranges");
258
-}
259
-EXPORT_SYMBOL_GPL(of_pci_range_parser_init);
260
-
261
-int of_pci_dma_range_parser_init(struct of_pci_range_parser *parser,
262
-				struct device_node *node)
263
-{
264
-	return parser_init(parser, node, "dma-ranges");
265
-}
266
-EXPORT_SYMBOL_GPL(of_pci_dma_range_parser_init);
267
-
268
-struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
269
-						struct of_pci_range *range)
270
-{
271
-	const int na = 3, ns = 2;
272
-
273
-	if (!range)
274
-		return NULL;
275
-
276
-	if (!parser->range || parser->range + parser->np > parser->end)
277
-		return NULL;
278
-
279
-	range->pci_space = be32_to_cpup(parser->range);
280
-	range->flags = of_bus_pci_get_flags(parser->range);
281
-	range->pci_addr = of_read_number(parser->range + 1, ns);
282
-	range->cpu_addr = of_translate_address(parser->node,
283
-				parser->range + na);
284
-	range->size = of_read_number(parser->range + parser->pna + na, ns);
285
-
286
-	parser->range += parser->np;
287
-
288
-	/* Now consume following elements while they are contiguous */
289
-	while (parser->range + parser->np <= parser->end) {
290
-		u32 flags;
291
-		u64 pci_addr, cpu_addr, size;
292
-
293
-		flags = of_bus_pci_get_flags(parser->range);
294
-		pci_addr = of_read_number(parser->range + 1, ns);
295
-		cpu_addr = of_translate_address(parser->node,
296
-				parser->range + na);
297
-		size = of_read_number(parser->range + parser->pna + na, ns);
298
-
299
-		if (flags != range->flags)
300
-			break;
301
-		if (pci_addr != range->pci_addr + range->size ||
302
-		    cpu_addr != range->cpu_addr + range->size)
303
-			break;
304
-
305
-		range->size += size;
306
-		parser->range += parser->np;
307
-	}
308
-
309
-	return range;
310
-}
311
-EXPORT_SYMBOL_GPL(of_pci_range_parser_one);
312
-
313256 /*
314257  * of_pci_range_to_resource - Create a resource from an of_pci_range
315258  * @range:	the PCI range that describes the resource
....@@ -371,7 +314,7 @@
371314 
372315 static int of_bus_isa_match(struct device_node *np)
373316 {
374
-	return !strcmp(np->name, "isa");
317
+	return of_node_name_eq(np, "isa");
375318 }
376319 
377320 static void of_bus_isa_count_cells(struct device_node *child,
....@@ -437,6 +380,7 @@
437380 		.count_cells = of_bus_pci_count_cells,
438381 		.map = of_bus_pci_map,
439382 		.translate = of_bus_pci_translate,
383
+		.has_flags = true,
440384 		.get_flags = of_bus_pci_get_flags,
441385 	},
442386 #endif /* CONFIG_PCI */
....@@ -448,6 +392,7 @@
448392 		.count_cells = of_bus_isa_count_cells,
449393 		.map = of_bus_isa_map,
450394 		.translate = of_bus_isa_translate,
395
+		.has_flags = true,
451396 		.get_flags = of_bus_isa_get_flags,
452397 	},
453398 	/* Default */
....@@ -517,9 +462,13 @@
517462 	 *
518463 	 * As far as we know, this damage only exists on Apple machines, so
519464 	 * This code is only enabled on powerpc. --gcl
465
+	 *
466
+	 * This quirk also applies for 'dma-ranges' which frequently exist in
467
+	 * child nodes without 'dma-ranges' in the parent nodes. --RobH
520468 	 */
521469 	ranges = of_get_property(parent, rprop, &rlen);
522
-	if (ranges == NULL && !of_empty_ranges_quirk(parent)) {
470
+	if (ranges == NULL && !of_empty_ranges_quirk(parent) &&
471
+	    strcmp(rprop, "dma-ranges")) {
523472 		pr_debug("no ranges; cannot translate\n");
524473 		return 1;
525474 	}
....@@ -569,6 +518,7 @@
569518  * relative to that node.
570519  */
571520 static u64 __of_translate_address(struct device_node *dev,
521
+				  struct device_node *(*get_parent)(const struct device_node *),
572522 				  const __be32 *in_addr, const char *rprop,
573523 				  struct device_node **host)
574524 {
....@@ -585,7 +535,7 @@
585535 
586536 	*host = NULL;
587537 	/* Get parent & match bus type */
588
-	parent = of_get_parent(dev);
538
+	parent = get_parent(dev);
589539 	if (parent == NULL)
590540 		goto bail;
591541 	bus = of_match_bus(parent);
....@@ -609,7 +559,7 @@
609559 		/* Switch to parent bus */
610560 		of_node_put(dev);
611561 		dev = parent;
612
-		parent = of_get_parent(dev);
562
+		parent = get_parent(dev);
613563 
614564 		/* If root, we have finished */
615565 		if (parent == NULL) {
....@@ -665,7 +615,8 @@
665615 	struct device_node *host;
666616 	u64 ret;
667617 
668
-	ret = __of_translate_address(dev, in_addr, "ranges", &host);
618
+	ret = __of_translate_address(dev, of_get_parent,
619
+				     in_addr, "ranges", &host);
669620 	if (host) {
670621 		of_node_put(host);
671622 		return OF_BAD_ADDR;
....@@ -675,12 +626,41 @@
675626 }
676627 EXPORT_SYMBOL(of_translate_address);
677628 
629
+static struct device_node *__of_get_dma_parent(const struct device_node *np)
630
+{
631
+	struct of_phandle_args args;
632
+	int ret, index;
633
+
634
+	index = of_property_match_string(np, "interconnect-names", "dma-mem");
635
+	if (index < 0)
636
+		return of_get_parent(np);
637
+
638
+	ret = of_parse_phandle_with_args(np, "interconnects",
639
+					 "#interconnect-cells",
640
+					 index, &args);
641
+	if (ret < 0)
642
+		return of_get_parent(np);
643
+
644
+	return of_node_get(args.np);
645
+}
646
+
647
+static struct device_node *of_get_next_dma_parent(struct device_node *np)
648
+{
649
+	struct device_node *parent;
650
+
651
+	parent = __of_get_dma_parent(np);
652
+	of_node_put(np);
653
+
654
+	return parent;
655
+}
656
+
678657 u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
679658 {
680659 	struct device_node *host;
681660 	u64 ret;
682661 
683
-	ret = __of_translate_address(dev, in_addr, "dma-ranges", &host);
662
+	ret = __of_translate_address(dev, __of_get_dma_parent,
663
+				     in_addr, "dma-ranges", &host);
684664 
685665 	if (host) {
686666 		of_node_put(host);
....@@ -729,6 +709,103 @@
729709 }
730710 EXPORT_SYMBOL(of_get_address);
731711 
712
+static int parser_init(struct of_pci_range_parser *parser,
713
+			struct device_node *node, const char *name)
714
+{
715
+	int rlen;
716
+
717
+	parser->node = node;
718
+	parser->pna = of_n_addr_cells(node);
719
+	parser->na = of_bus_n_addr_cells(node);
720
+	parser->ns = of_bus_n_size_cells(node);
721
+	parser->dma = !strcmp(name, "dma-ranges");
722
+	parser->bus = of_match_bus(node);
723
+
724
+	parser->range = of_get_property(node, name, &rlen);
725
+	if (parser->range == NULL)
726
+		return -ENOENT;
727
+
728
+	parser->end = parser->range + rlen / sizeof(__be32);
729
+
730
+	return 0;
731
+}
732
+
733
+int of_pci_range_parser_init(struct of_pci_range_parser *parser,
734
+				struct device_node *node)
735
+{
736
+	return parser_init(parser, node, "ranges");
737
+}
738
+EXPORT_SYMBOL_GPL(of_pci_range_parser_init);
739
+
740
+int of_pci_dma_range_parser_init(struct of_pci_range_parser *parser,
741
+				struct device_node *node)
742
+{
743
+	return parser_init(parser, node, "dma-ranges");
744
+}
745
+EXPORT_SYMBOL_GPL(of_pci_dma_range_parser_init);
746
+#define of_dma_range_parser_init of_pci_dma_range_parser_init
747
+
748
+struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
749
+						struct of_pci_range *range)
750
+{
751
+	int na = parser->na;
752
+	int ns = parser->ns;
753
+	int np = parser->pna + na + ns;
754
+	int busflag_na = 0;
755
+
756
+	if (!range)
757
+		return NULL;
758
+
759
+	if (!parser->range || parser->range + np > parser->end)
760
+		return NULL;
761
+
762
+	range->flags = parser->bus->get_flags(parser->range);
763
+
764
+	/* A extra cell for resource flags */
765
+	if (parser->bus->has_flags)
766
+		busflag_na = 1;
767
+
768
+	range->bus_addr = of_read_number(parser->range + busflag_na, na - busflag_na);
769
+
770
+	if (parser->dma)
771
+		range->cpu_addr = of_translate_dma_address(parser->node,
772
+				parser->range + na);
773
+	else
774
+		range->cpu_addr = of_translate_address(parser->node,
775
+				parser->range + na);
776
+	range->size = of_read_number(parser->range + parser->pna + na, ns);
777
+
778
+	parser->range += np;
779
+
780
+	/* Now consume following elements while they are contiguous */
781
+	while (parser->range + np <= parser->end) {
782
+		u32 flags = 0;
783
+		u64 bus_addr, cpu_addr, size;
784
+
785
+		flags = parser->bus->get_flags(parser->range);
786
+		bus_addr = of_read_number(parser->range + busflag_na, na - busflag_na);
787
+		if (parser->dma)
788
+			cpu_addr = of_translate_dma_address(parser->node,
789
+					parser->range + na);
790
+		else
791
+			cpu_addr = of_translate_address(parser->node,
792
+					parser->range + na);
793
+		size = of_read_number(parser->range + parser->pna + na, ns);
794
+
795
+		if (flags != range->flags)
796
+			break;
797
+		if (bus_addr != range->bus_addr + range->size ||
798
+		    cpu_addr != range->cpu_addr + range->size)
799
+			break;
800
+
801
+		range->size += size;
802
+		parser->range += np;
803
+	}
804
+
805
+	return range;
806
+}
807
+EXPORT_SYMBOL_GPL(of_pci_range_parser_one);
808
+
732809 static u64 of_translate_ioport(struct device_node *dev, const __be32 *in_addr,
733810 			u64 size)
734811 {
....@@ -736,7 +813,8 @@
736813 	unsigned long port;
737814 	struct device_node *host;
738815 
739
-	taddr = __of_translate_address(dev, in_addr, "ranges", &host);
816
+	taddr = __of_translate_address(dev, of_get_parent,
817
+				       in_addr, "ranges", &host);
740818 	if (host) {
741819 		/* host-specific port access */
742820 		port = logic_pio_trans_hwaddr(&host->fwnode, taddr, size);
....@@ -804,28 +882,9 @@
804882 }
805883 EXPORT_SYMBOL_GPL(of_address_to_resource);
806884 
807
-struct device_node *of_find_matching_node_by_address(struct device_node *from,
808
-					const struct of_device_id *matches,
809
-					u64 base_address)
810
-{
811
-	struct device_node *dn = of_find_matching_node(from, matches);
812
-	struct resource res;
813
-
814
-	while (dn) {
815
-		if (!of_address_to_resource(dn, 0, &res) &&
816
-		    res.start == base_address)
817
-			return dn;
818
-
819
-		dn = of_find_matching_node(dn, matches);
820
-	}
821
-
822
-	return NULL;
823
-}
824
-
825
-
826885 /**
827886  * of_iomap - Maps the memory mapped IO for a given device_node
828
- * @device:	the device whose io range will be mapped
887
+ * @np:		the device whose io range will be mapped
829888  * @index:	index of the io range
830889  *
831890  * Returns a pointer to the mapped memory
....@@ -879,91 +938,133 @@
879938 }
880939 EXPORT_SYMBOL(of_io_request_and_map);
881940 
941
+#ifdef CONFIG_HAS_DMA
882942 /**
883
- * of_dma_get_range - Get DMA range info
943
+ * of_dma_get_range - Get DMA range info and put it into a map array
884944  * @np:		device node to get DMA range info
885
- * @dma_addr:	pointer to store initial DMA address of DMA range
886
- * @paddr:	pointer to store initial CPU address of DMA range
887
- * @size:	pointer to store size of DMA range
945
+ * @map:	dma range structure to return
888946  *
889947  * Look in bottom up direction for the first "dma-ranges" property
890
- * and parse it.
891
- *  dma-ranges format:
948
+ * and parse it.  Put the information into a DMA offset map array.
949
+ *
950
+ * dma-ranges format:
892951  *	DMA addr (dma_addr)	: naddr cells
893952  *	CPU addr (phys_addr_t)	: pna cells
894953  *	size			: nsize cells
895954  *
896
- * It returns -ENODEV if "dma-ranges" property was not found
897
- * for this device in DT.
955
+ * It returns -ENODEV if "dma-ranges" property was not found for this
956
+ * device in the DT.
898957  */
899
-int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *size)
958
+int of_dma_get_range(struct device_node *np, const struct bus_dma_region **map)
900959 {
901960 	struct device_node *node = of_node_get(np);
902961 	const __be32 *ranges = NULL;
903
-	int len, naddr, nsize, pna;
962
+	bool found_dma_ranges = false;
963
+	struct of_range_parser parser;
964
+	struct of_range range;
965
+	struct bus_dma_region *r;
966
+	int len, num_ranges = 0;
904967 	int ret = 0;
905
-	u64 dmaaddr;
906968 
907
-	if (!node)
908
-		return -EINVAL;
909
-
910
-	while (1) {
911
-		naddr = of_n_addr_cells(node);
912
-		nsize = of_n_size_cells(node);
913
-		node = of_get_next_parent(node);
914
-		if (!node)
915
-			break;
916
-
969
+	while (node) {
917970 		ranges = of_get_property(node, "dma-ranges", &len);
918971 
919972 		/* Ignore empty ranges, they imply no translation required */
920973 		if (ranges && len > 0)
921974 			break;
922975 
923
-		/*
924
-		 * At least empty ranges has to be defined for parent node if
925
-		 * DMA is supported
926
-		 */
927
-		if (!ranges)
928
-			break;
976
+		/* Once we find 'dma-ranges', then a missing one is an error */
977
+		if (found_dma_ranges && !ranges) {
978
+			ret = -ENODEV;
979
+			goto out;
980
+		}
981
+		found_dma_ranges = true;
982
+
983
+		node = of_get_next_dma_parent(node);
929984 	}
930985 
931
-	if (!ranges) {
986
+	if (!node || !ranges) {
932987 		pr_debug("no dma-ranges found for node(%pOF)\n", np);
933988 		ret = -ENODEV;
934989 		goto out;
935990 	}
936991 
937
-	len /= sizeof(u32);
992
+	of_dma_range_parser_init(&parser, node);
993
+	for_each_of_range(&parser, &range)
994
+		num_ranges++;
938995 
939
-	pna = of_n_addr_cells(node);
940
-
941
-	/* dma-ranges format:
942
-	 * DMA addr	: naddr cells
943
-	 * CPU addr	: pna cells
944
-	 * size		: nsize cells
945
-	 */
946
-	dmaaddr = of_read_number(ranges, naddr);
947
-	*paddr = of_translate_dma_address(np, ranges);
948
-	if (*paddr == OF_BAD_ADDR) {
949
-		pr_err("translation of DMA address(%pad) to CPU address failed node(%pOF)\n",
950
-		       dma_addr, np);
951
-		ret = -EINVAL;
996
+	r = kcalloc(num_ranges + 1, sizeof(*r), GFP_KERNEL);
997
+	if (!r) {
998
+		ret = -ENOMEM;
952999 		goto out;
9531000 	}
954
-	*dma_addr = dmaaddr;
9551001 
956
-	*size = of_read_number(ranges + naddr + pna, nsize);
957
-
958
-	pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n",
959
-		 *dma_addr, *paddr, *size);
960
-
1002
+	/*
1003
+	 * Record all info in the generic DMA ranges array for struct device.
1004
+	 */
1005
+	*map = r;
1006
+	of_dma_range_parser_init(&parser, node);
1007
+	for_each_of_range(&parser, &range) {
1008
+		pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n",
1009
+			 range.bus_addr, range.cpu_addr, range.size);
1010
+		if (range.cpu_addr == OF_BAD_ADDR) {
1011
+			pr_err("translation of DMA address(%llx) to CPU address failed node(%pOF)\n",
1012
+			       range.bus_addr, node);
1013
+			continue;
1014
+		}
1015
+		r->cpu_start = range.cpu_addr;
1016
+		r->dma_start = range.bus_addr;
1017
+		r->size = range.size;
1018
+		r->offset = range.cpu_addr - range.bus_addr;
1019
+		r++;
1020
+	}
9611021 out:
9621022 	of_node_put(node);
963
-
9641023 	return ret;
9651024 }
966
-EXPORT_SYMBOL_GPL(of_dma_get_range);
1025
+#endif /* CONFIG_HAS_DMA */
1026
+
1027
+/**
1028
+ * of_dma_get_max_cpu_address - Gets highest CPU address suitable for DMA
1029
+ * @np: The node to start searching from or NULL to start from the root
1030
+ *
1031
+ * Gets the highest CPU physical address that is addressable by all DMA masters
1032
+ * in the sub-tree pointed by np, or the whole tree if NULL is passed. If no
1033
+ * DMA constrained device is found, it returns PHYS_ADDR_MAX.
1034
+ */
1035
+phys_addr_t __init of_dma_get_max_cpu_address(struct device_node *np)
1036
+{
1037
+	phys_addr_t max_cpu_addr = PHYS_ADDR_MAX;
1038
+	struct of_range_parser parser;
1039
+	phys_addr_t subtree_max_addr;
1040
+	struct device_node *child;
1041
+	struct of_range range;
1042
+	const __be32 *ranges;
1043
+	u64 cpu_end = 0;
1044
+	int len;
1045
+
1046
+	if (!np)
1047
+		np = of_root;
1048
+
1049
+	ranges = of_get_property(np, "dma-ranges", &len);
1050
+	if (ranges && len) {
1051
+		of_dma_range_parser_init(&parser, np);
1052
+		for_each_of_range(&parser, &range)
1053
+			if (range.cpu_addr + range.size > cpu_end)
1054
+				cpu_end = range.cpu_addr + range.size - 1;
1055
+
1056
+		if (max_cpu_addr > cpu_end)
1057
+			max_cpu_addr = cpu_end;
1058
+	}
1059
+
1060
+	for_each_available_child_of_node(np, child) {
1061
+		subtree_max_addr = of_dma_get_max_cpu_address(child);
1062
+		if (max_cpu_addr > subtree_max_addr)
1063
+			max_cpu_addr = subtree_max_addr;
1064
+	}
1065
+
1066
+	return max_cpu_addr;
1067
+}
9671068 
9681069 /**
9691070  * of_dma_is_coherent - Check if device is coherent
....@@ -987,7 +1088,7 @@
9871088 			of_node_put(node);
9881089 			return true;
9891090 		}
990
-		node = of_get_next_parent(node);
1091
+		node = of_get_next_dma_parent(node);
9911092 	}
9921093 	of_node_put(node);
9931094 	return false;