Robert Reif | c9f5b7e | 2009-06-04 02:00:02 -0700 | [diff] [blame] | 1 | #include <linux/string.h> |
| 2 | #include <linux/kernel.h> |
| 3 | #include <linux/of.h> |
| 4 | #include <linux/init.h> |
| 5 | #include <linux/module.h> |
| 6 | #include <linux/mod_devicetable.h> |
| 7 | #include <linux/slab.h> |
| 8 | #include <linux/errno.h> |
| 9 | #include <linux/irq.h> |
| 10 | #include <linux/of_device.h> |
| 11 | #include <linux/of_platform.h> |
| 12 | |
| 13 | #include "of_device_common.h" |
| 14 | |
| 15 | static int node_match(struct device *dev, void *data) |
| 16 | { |
| 17 | struct of_device *op = to_of_device(dev); |
| 18 | struct device_node *dp = data; |
| 19 | |
| 20 | return (op->node == dp); |
| 21 | } |
| 22 | |
| 23 | struct of_device *of_find_device_by_node(struct device_node *dp) |
| 24 | { |
| 25 | struct device *dev = bus_find_device(&of_platform_bus_type, NULL, |
| 26 | dp, node_match); |
| 27 | |
| 28 | if (dev) |
| 29 | return to_of_device(dev); |
| 30 | |
| 31 | return NULL; |
| 32 | } |
| 33 | EXPORT_SYMBOL(of_find_device_by_node); |
| 34 | |
| 35 | unsigned int irq_of_parse_and_map(struct device_node *node, int index) |
| 36 | { |
| 37 | struct of_device *op = of_find_device_by_node(node); |
| 38 | |
| 39 | if (!op || index >= op->num_irqs) |
| 40 | return 0; |
| 41 | |
| 42 | return op->irqs[index]; |
| 43 | } |
| 44 | EXPORT_SYMBOL(irq_of_parse_and_map); |
| 45 | |
| 46 | /* Take the archdata values for IOMMU, STC, and HOSTDATA found in |
| 47 | * BUS and propagate to all child of_device objects. |
| 48 | */ |
| 49 | void of_propagate_archdata(struct of_device *bus) |
| 50 | { |
| 51 | struct dev_archdata *bus_sd = &bus->dev.archdata; |
| 52 | struct device_node *bus_dp = bus->node; |
| 53 | struct device_node *dp; |
| 54 | |
| 55 | for (dp = bus_dp->child; dp; dp = dp->sibling) { |
| 56 | struct of_device *op = of_find_device_by_node(dp); |
| 57 | |
| 58 | op->dev.archdata.iommu = bus_sd->iommu; |
| 59 | op->dev.archdata.stc = bus_sd->stc; |
| 60 | op->dev.archdata.host_controller = bus_sd->host_controller; |
| 61 | op->dev.archdata.numa_node = bus_sd->numa_node; |
| 62 | |
| 63 | if (dp->child) |
| 64 | of_propagate_archdata(op); |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | struct bus_type of_platform_bus_type; |
| 69 | EXPORT_SYMBOL(of_platform_bus_type); |
| 70 | |
| 71 | static void get_cells(struct device_node *dp, int *addrc, int *sizec) |
| 72 | { |
| 73 | if (addrc) |
| 74 | *addrc = of_n_addr_cells(dp); |
| 75 | if (sizec) |
| 76 | *sizec = of_n_size_cells(dp); |
| 77 | } |
| 78 | |
| 79 | /* |
| 80 | * Default translator (generic bus) |
| 81 | */ |
| 82 | |
| 83 | void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec) |
| 84 | { |
| 85 | get_cells(dev, addrc, sizec); |
| 86 | } |
| 87 | |
| 88 | /* Make sure the least significant 64-bits are in-range. Even |
| 89 | * for 3 or 4 cell values it is a good enough approximation. |
| 90 | */ |
| 91 | int of_out_of_range(const u32 *addr, const u32 *base, |
| 92 | const u32 *size, int na, int ns) |
| 93 | { |
| 94 | u64 a = of_read_addr(addr, na); |
| 95 | u64 b = of_read_addr(base, na); |
| 96 | |
| 97 | if (a < b) |
| 98 | return 1; |
| 99 | |
| 100 | b += of_read_addr(size, ns); |
| 101 | if (a >= b) |
| 102 | return 1; |
| 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna) |
| 108 | { |
| 109 | u32 result[OF_MAX_ADDR_CELLS]; |
| 110 | int i; |
| 111 | |
| 112 | if (ns > 2) { |
| 113 | printk("of_device: Cannot handle size cells (%d) > 2.", ns); |
| 114 | return -EINVAL; |
| 115 | } |
| 116 | |
| 117 | if (of_out_of_range(addr, range, range + na + pna, na, ns)) |
| 118 | return -EINVAL; |
| 119 | |
| 120 | /* Start with the parent range base. */ |
| 121 | memcpy(result, range + na, pna * 4); |
| 122 | |
| 123 | /* Add in the child address offset. */ |
| 124 | for (i = 0; i < na; i++) |
| 125 | result[pna - 1 - i] += |
| 126 | (addr[na - 1 - i] - |
| 127 | range[na - 1 - i]); |
| 128 | |
| 129 | memcpy(addr, result, pna * 4); |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags) |
| 135 | { |
| 136 | if (flags) |
| 137 | return flags; |
| 138 | return IORESOURCE_MEM; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * SBUS bus specific translator |
| 143 | */ |
| 144 | |
| 145 | int of_bus_sbus_match(struct device_node *np) |
| 146 | { |
| 147 | struct device_node *dp = np; |
| 148 | |
| 149 | while (dp) { |
| 150 | if (!strcmp(dp->name, "sbus") || |
| 151 | !strcmp(dp->name, "sbi")) |
| 152 | return 1; |
| 153 | |
| 154 | /* Have a look at use_1to1_mapping(). We're trying |
| 155 | * to match SBUS if that's the top-level bus and we |
| 156 | * don't have some intervening real bus that provides |
| 157 | * ranges based translations. |
| 158 | */ |
| 159 | if (of_find_property(dp, "ranges", NULL) != NULL) |
| 160 | break; |
| 161 | |
| 162 | dp = dp->parent; |
| 163 | } |
| 164 | |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec) |
| 169 | { |
| 170 | if (addrc) |
| 171 | *addrc = 2; |
| 172 | if (sizec) |
| 173 | *sizec = 1; |
| 174 | } |