sparc/kernel/of_device_common.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 #include <linux/string.h>
0003 #include <linux/kernel.h>
0004 #include <linux/of.h>
0005 #include <linux/export.h>
0006 #include <linux/mod_devicetable.h>
0007 #include <linux/errno.h>
0008 #include <linux/irq.h>
0009 #include <linux/of_platform.h>
0010 #include <linux/of_address.h>
0011 #include <linux/of_device.h>
0012 #include <linux/of_irq.h>
0013
0014 #include "of_device_common.h"
0015
0016 unsigned int irq_of_parse_and_map(struct device_node *node, int index)
0017 {
0018     struct platform_device *op = of_find_device_by_node(node);
0019
0020     if (!op || index >= op->archdata.num_irqs)
0021         return 0;
0022
0023     return op->archdata.irqs[index];
0024 }
0025 EXPORT_SYMBOL(irq_of_parse_and_map);
0026
0027 int of_address_to_resource(struct device_node *node, int index,
0028                struct resource *r)
0029 {
0030     struct platform_device *op = of_find_device_by_node(node);
0031
0032     if (!op || index >= op->num_resources)
0033         return -EINVAL;
0034
0035     memcpy(r, &op->archdata.resource[index], sizeof(*r));
0036     return 0;
0037 }
0038 EXPORT_SYMBOL_GPL(of_address_to_resource);
0039
0040 void __iomem *of_iomap(struct device_node *node, int index)
0041 {
0042     struct platform_device *op = of_find_device_by_node(node);
0043     struct resource *r;
0044
0045     if (!op || index >= op->num_resources)
0046         return NULL;
0047
0048     r = &op->archdata.resource[index];
0049
0050     return of_ioremap(r, 0, resource_size(r), (char *) r->name);
0051 }
0052 EXPORT_SYMBOL(of_iomap);
0053
0054 /* Take the archdata values for IOMMU, STC, and HOSTDATA found in
0055  * BUS and propagate to all child platform_device objects.
0056  */
0057 void of_propagate_archdata(struct platform_device *bus)
0058 {
0059     struct dev_archdata *bus_sd = &bus->dev.archdata;
0060     struct device_node *bus_dp = bus->dev.of_node;
0061     struct device_node *dp;
0062
0063     for (dp = bus_dp->child; dp; dp = dp->sibling) {
0064         struct platform_device *op = of_find_device_by_node(dp);
0065
0066         op->dev.archdata.iommu = bus_sd->iommu;
0067         op->dev.archdata.stc = bus_sd->stc;
0068         op->dev.archdata.host_controller = bus_sd->host_controller;
0069         op->dev.archdata.numa_node = bus_sd->numa_node;
0070         op->dev.dma_ops = bus->dev.dma_ops;
0071
0072         if (dp->child)
0073             of_propagate_archdata(op);
0074     }
0075 }
0076
0077 static void get_cells(struct device_node *dp, int *addrc, int *sizec)
0078 {
0079     if (addrc)
0080         *addrc = of_n_addr_cells(dp);
0081     if (sizec)
0082         *sizec = of_n_size_cells(dp);
0083 }
0084
0085 /*
0086  * Default translator (generic bus)
0087  */
0088
0089 void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
0090 {
0091     get_cells(dev, addrc, sizec);
0092 }
0093
0094 /* Make sure the least significant 64-bits are in-range.  Even
0095  * for 3 or 4 cell values it is a good enough approximation.
0096  */
0097 int of_out_of_range(const u32 *addr, const u32 *base,
0098             const u32 *size, int na, int ns)
0099 {
0100     u64 a = of_read_addr(addr, na);
0101     u64 b = of_read_addr(base, na);
0102
0103     if (a < b)
0104         return 1;
0105
0106     b += of_read_addr(size, ns);
0107     if (a >= b)
0108         return 1;
0109
0110     return 0;
0111 }
0112
0113 int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
0114 {
0115     u32 result[OF_MAX_ADDR_CELLS];
0116     int i;
0117
0118     if (ns > 2) {
0119         printk("of_device: Cannot handle size cells (%d) > 2.", ns);
0120         return -EINVAL;
0121     }
0122
0123     if (of_out_of_range(addr, range, range + na + pna, na, ns))
0124         return -EINVAL;
0125
0126     /* Start with the parent range base.  */
0127     memcpy(result, range + na, pna * 4);
0128
0129     /* Add in the child address offset.  */
0130     for (i = 0; i < na; i++)
0131         result[pna - 1 - i] +=
0132             (addr[na - 1 - i] -
0133              range[na - 1 - i]);
0134
0135     memcpy(addr, result, pna * 4);
0136
0137     return 0;
0138 }
0139
0140 unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
0141 {
0142     if (flags)
0143         return flags;
0144     return IORESOURCE_MEM;
0145 }
0146
0147 /*
0148  * SBUS bus specific translator
0149  */
0150
0151 int of_bus_sbus_match(struct device_node *np)
0152 {
0153     struct device_node *dp = np;
0154
0155     while (dp) {
0156         if (of_node_name_eq(dp, "sbus") ||
0157             of_node_name_eq(dp, "sbi"))
0158             return 1;
0159
0160         /* Have a look at use_1to1_mapping().  We're trying
0161          * to match SBUS if that's the top-level bus and we
0162          * don't have some intervening real bus that provides
0163          * ranges based translations.
0164          */
0165         if (of_find_property(dp, "ranges", NULL) != NULL)
0166             break;
0167
0168         dp = dp->parent;
0169     }
0170
0171     return 0;
0172 }
0173
0174 void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
0175 {
0176     if (addrc)
0177         *addrc = 2;
0178     if (sizec)
0179         *sizec = 1;
0180 }