1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/string.h> 3 #include <linux/kernel.h> 4 #include <linux/of.h> 5 #include <linux/export.h> 6 #include <linux/mod_devicetable.h> 7 #include <linux/errno.h> 8 #include <linux/irq.h> 9 #include <linux/of_platform.h> 10 #include <linux/of_address.h> 11 #include <linux/of_device.h> 12 #include <linux/of_irq.h> 13 14 #include "of_device_common.h" 15 16 unsigned int irq_of_parse_and_map(struct device_node *node, int index) 17 { 18 struct platform_device *op = of_find_device_by_node(node); 19 20 if (!op || index >= op->archdata.num_irqs) 21 return 0; 22 23 return op->archdata.irqs[index]; 24 } 25 EXPORT_SYMBOL(irq_of_parse_and_map); 26 27 int of_address_to_resource(struct device_node *node, int index, 28 struct resource *r) 29 { 30 struct platform_device *op = of_find_device_by_node(node); 31 32 if (!op || index >= op->num_resources) 33 return -EINVAL; 34 35 memcpy(r, &op->archdata.resource[index], sizeof(*r)); 36 return 0; 37 } 38 EXPORT_SYMBOL_GPL(of_address_to_resource); 39 40 void __iomem *of_iomap(struct device_node *node, int index) 41 { 42 struct platform_device *op = of_find_device_by_node(node); 43 struct resource *r; 44 45 if (!op || index >= op->num_resources) 46 return NULL; 47 48 r = &op->archdata.resource[index]; 49 50 return of_ioremap(r, 0, resource_size(r), (char *) r->name); 51 } 52 EXPORT_SYMBOL(of_iomap); 53 54 /* Take the archdata values for IOMMU, STC, and HOSTDATA found in 55 * BUS and propagate to all child platform_device objects. 56 */ 57 void of_propagate_archdata(struct platform_device *bus) 58 { 59 struct dev_archdata *bus_sd = &bus->dev.archdata; 60 struct device_node *bus_dp = bus->dev.of_node; 61 struct device_node *dp; 62 63 for (dp = bus_dp->child; dp; dp = dp->sibling) { 64 struct platform_device *op = of_find_device_by_node(dp); 65 66 op->dev.archdata.iommu = bus_sd->iommu; 67 op->dev.archdata.stc = bus_sd->stc; 68 op->dev.archdata.host_controller = bus_sd->host_controller; 69 op->dev.archdata.numa_node = bus_sd->numa_node; 70 op->dev.dma_ops = bus->dev.dma_ops; 71 72 if (dp->child) 73 of_propagate_archdata(op); 74 } 75 } 76 77 static void get_cells(struct device_node *dp, int *addrc, int *sizec) 78 { 79 if (addrc) 80 *addrc = of_n_addr_cells(dp); 81 if (sizec) 82 *sizec = of_n_size_cells(dp); 83 } 84 85 /* 86 * Default translator (generic bus) 87 */ 88 89 void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec) 90 { 91 get_cells(dev, addrc, sizec); 92 } 93 94 /* Make sure the least significant 64-bits are in-range. Even 95 * for 3 or 4 cell values it is a good enough approximation. 96 */ 97 int of_out_of_range(const u32 *addr, const u32 *base, 98 const u32 *size, int na, int ns) 99 { 100 u64 a = of_read_addr(addr, na); 101 u64 b = of_read_addr(base, na); 102 103 if (a < b) 104 return 1; 105 106 b += of_read_addr(size, ns); 107 if (a >= b) 108 return 1; 109 110 return 0; 111 } 112 113 int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna) 114 { 115 u32 result[OF_MAX_ADDR_CELLS]; 116 int i; 117 118 if (ns > 2) { 119 printk("of_device: Cannot handle size cells (%d) > 2.", ns); 120 return -EINVAL; 121 } 122 123 if (of_out_of_range(addr, range, range + na + pna, na, ns)) 124 return -EINVAL; 125 126 /* Start with the parent range base. */ 127 memcpy(result, range + na, pna * 4); 128 129 /* Add in the child address offset. */ 130 for (i = 0; i < na; i++) 131 result[pna - 1 - i] += 132 (addr[na - 1 - i] - 133 range[na - 1 - i]); 134 135 memcpy(addr, result, pna * 4); 136 137 return 0; 138 } 139 140 unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags) 141 { 142 if (flags) 143 return flags; 144 return IORESOURCE_MEM; 145 } 146 147 /* 148 * SBUS bus specific translator 149 */ 150 151 int of_bus_sbus_match(struct device_node *np) 152 { 153 struct device_node *dp = np; 154 155 while (dp) { 156 if (of_node_name_eq(dp, "sbus") || 157 of_node_name_eq(dp, "sbi")) 158 return 1; 159 160 /* Have a look at use_1to1_mapping(). We're trying 161 * to match SBUS if that's the top-level bus and we 162 * don't have some intervening real bus that provides 163 * ranges based translations. 164 */ 165 if (of_property_present(dp, "ranges")) 166 break; 167 168 dp = dp->parent; 169 } 170 171 return 0; 172 } 173 174 void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec) 175 { 176 if (addrc) 177 *addrc = 2; 178 if (sizec) 179 *sizec = 1; 180 } 181