684 lines
17 KiB
C
684 lines
17 KiB
C
#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/pci_regs.h>
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/etherdevice.h>
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#include <asm/prom.h>
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#include <asm/pci-bridge.h>
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#define PRu64 "%llx"
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/* Max address size we deal with */
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#define OF_MAX_ADDR_CELLS 4
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#define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
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(ns) > 0)
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static struct of_bus *of_match_bus(struct device_node *np);
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static int __of_address_to_resource(struct device_node *dev,
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const u32 *addrp, u64 size, unsigned int flags,
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struct resource *r);
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/* Debug utility */
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#ifdef DEBUG
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static void of_dump_addr(const char *s, const u32 *addr, int na)
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{
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printk(KERN_INFO "%s", s);
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while (na--)
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printk(KERN_INFO " %08x", *(addr++));
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printk(KERN_INFO "\n");
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}
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#else
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static void of_dump_addr(const char *s, const u32 *addr, int na) { }
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#endif
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/* Callbacks for bus specific translators */
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struct of_bus {
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const char *name;
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const char *addresses;
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int (*match)(struct device_node *parent);
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void (*count_cells)(struct device_node *child,
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int *addrc, int *sizec);
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u64 (*map)(u32 *addr, const u32 *range,
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int na, int ns, int pna);
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int (*translate)(u32 *addr, u64 offset, int na);
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unsigned int (*get_flags)(const u32 *addr);
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};
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/*
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* Default translator (generic bus)
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*/
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static void of_bus_default_count_cells(struct device_node *dev,
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int *addrc, int *sizec)
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{
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if (addrc)
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*addrc = of_n_addr_cells(dev);
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if (sizec)
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*sizec = of_n_size_cells(dev);
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}
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static u64 of_bus_default_map(u32 *addr, const u32 *range,
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int na, int ns, int pna)
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{
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u64 cp, s, da;
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cp = of_read_number(range, na);
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s = of_read_number(range + na + pna, ns);
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da = of_read_number(addr, na);
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pr_debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
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cp, s, da);
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if (da < cp || da >= (cp + s))
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return OF_BAD_ADDR;
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return da - cp;
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}
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static int of_bus_default_translate(u32 *addr, u64 offset, int na)
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{
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u64 a = of_read_number(addr, na);
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memset(addr, 0, na * 4);
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a += offset;
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if (na > 1)
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addr[na - 2] = a >> 32;
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addr[na - 1] = a & 0xffffffffu;
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return 0;
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}
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static unsigned int of_bus_default_get_flags(const u32 *addr)
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{
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return IORESOURCE_MEM;
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}
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#ifdef CONFIG_PCI
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/*
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* PCI bus specific translator
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*/
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static int of_bus_pci_match(struct device_node *np)
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{
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/* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */
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return !strcmp(np->type, "pci") || !strcmp(np->type, "vci");
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}
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static void of_bus_pci_count_cells(struct device_node *np,
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int *addrc, int *sizec)
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{
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if (addrc)
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*addrc = 3;
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if (sizec)
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*sizec = 2;
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}
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static u64 of_bus_pci_map(u32 *addr, const u32 *range, int na, int ns, int pna)
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{
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u64 cp, s, da;
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/* Check address type match */
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if ((addr[0] ^ range[0]) & 0x03000000)
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return OF_BAD_ADDR;
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/* Read address values, skipping high cell */
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cp = of_read_number(range + 1, na - 1);
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s = of_read_number(range + na + pna, ns);
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da = of_read_number(addr + 1, na - 1);
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pr_debug("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
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if (da < cp || da >= (cp + s))
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return OF_BAD_ADDR;
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return da - cp;
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}
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static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
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{
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return of_bus_default_translate(addr + 1, offset, na - 1);
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}
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static unsigned int of_bus_pci_get_flags(const u32 *addr)
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{
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unsigned int flags = 0;
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u32 w = addr[0];
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switch ((w >> 24) & 0x03) {
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case 0x01:
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flags |= IORESOURCE_IO;
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break;
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case 0x02: /* 32 bits */
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case 0x03: /* 64 bits */
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flags |= IORESOURCE_MEM;
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break;
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}
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if (w & 0x40000000)
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flags |= IORESOURCE_PREFETCH;
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return flags;
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}
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const u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
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unsigned int *flags)
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{
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const u32 *prop;
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unsigned int psize;
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struct device_node *parent;
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struct of_bus *bus;
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int onesize, i, na, ns;
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/* Get parent & match bus type */
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parent = of_get_parent(dev);
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if (parent == NULL)
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return NULL;
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bus = of_match_bus(parent);
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if (strcmp(bus->name, "pci")) {
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of_node_put(parent);
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return NULL;
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}
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bus->count_cells(dev, &na, &ns);
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of_node_put(parent);
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if (!OF_CHECK_COUNTS(na, ns))
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return NULL;
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/* Get "reg" or "assigned-addresses" property */
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prop = of_get_property(dev, bus->addresses, &psize);
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if (prop == NULL)
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return NULL;
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psize /= 4;
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onesize = na + ns;
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for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
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if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
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if (size)
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*size = of_read_number(prop + na, ns);
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if (flags)
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*flags = bus->get_flags(prop);
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return prop;
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}
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return NULL;
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}
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EXPORT_SYMBOL(of_get_pci_address);
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int of_pci_address_to_resource(struct device_node *dev, int bar,
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struct resource *r)
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{
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const u32 *addrp;
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u64 size;
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unsigned int flags;
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addrp = of_get_pci_address(dev, bar, &size, &flags);
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if (addrp == NULL)
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return -EINVAL;
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return __of_address_to_resource(dev, addrp, size, flags, r);
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}
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EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
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static u8 of_irq_pci_swizzle(u8 slot, u8 pin)
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{
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return (((pin - 1) + slot) % 4) + 1;
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}
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int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq)
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{
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struct device_node *dn, *ppnode;
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struct pci_dev *ppdev;
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u32 lspec;
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u32 laddr[3];
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u8 pin;
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int rc;
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/* Check if we have a device node, if yes, fallback to standard OF
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* parsing
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*/
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dn = pci_device_to_OF_node(pdev);
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if (dn)
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return of_irq_map_one(dn, 0, out_irq);
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/* Ok, we don't, time to have fun. Let's start by building up an
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* interrupt spec. we assume #interrupt-cells is 1, which is standard
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* for PCI. If you do different, then don't use that routine.
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*/
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rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin);
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if (rc != 0)
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return rc;
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/* No pin, exit */
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if (pin == 0)
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return -ENODEV;
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/* Now we walk up the PCI tree */
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lspec = pin;
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for (;;) {
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/* Get the pci_dev of our parent */
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ppdev = pdev->bus->self;
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/* Ouch, it's a host bridge... */
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if (ppdev == NULL) {
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struct pci_controller *host;
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host = pci_bus_to_host(pdev->bus);
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ppnode = host ? host->dn : NULL;
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/* No node for host bridge ? give up */
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if (ppnode == NULL)
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return -EINVAL;
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} else
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/* We found a P2P bridge, check if it has a node */
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ppnode = pci_device_to_OF_node(ppdev);
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/* Ok, we have found a parent with a device-node, hand over to
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* the OF parsing code.
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* We build a unit address from the linux device to be used for
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* resolution. Note that we use the linux bus number which may
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* not match your firmware bus numbering.
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* Fortunately, in most cases, interrupt-map-mask doesn't
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* include the bus number as part of the matching.
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* You should still be careful about that though if you intend
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* to rely on this function (you ship a firmware that doesn't
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* create device nodes for all PCI devices).
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*/
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if (ppnode)
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break;
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/* We can only get here if we hit a P2P bridge with no node,
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* let's do standard swizzling and try again
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*/
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lspec = of_irq_pci_swizzle(PCI_SLOT(pdev->devfn), lspec);
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pdev = ppdev;
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}
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laddr[0] = (pdev->bus->number << 16)
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| (pdev->devfn << 8);
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laddr[1] = laddr[2] = 0;
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return of_irq_map_raw(ppnode, &lspec, 1, laddr, out_irq);
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}
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EXPORT_SYMBOL_GPL(of_irq_map_pci);
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#endif /* CONFIG_PCI */
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/*
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* ISA bus specific translator
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*/
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static int of_bus_isa_match(struct device_node *np)
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{
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return !strcmp(np->name, "isa");
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}
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static void of_bus_isa_count_cells(struct device_node *child,
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int *addrc, int *sizec)
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{
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if (addrc)
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*addrc = 2;
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if (sizec)
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*sizec = 1;
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}
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static u64 of_bus_isa_map(u32 *addr, const u32 *range, int na, int ns, int pna)
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{
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u64 cp, s, da;
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/* Check address type match */
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if ((addr[0] ^ range[0]) & 0x00000001)
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return OF_BAD_ADDR;
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/* Read address values, skipping high cell */
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cp = of_read_number(range + 1, na - 1);
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s = of_read_number(range + na + pna, ns);
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da = of_read_number(addr + 1, na - 1);
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pr_debug("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
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if (da < cp || da >= (cp + s))
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return OF_BAD_ADDR;
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return da - cp;
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}
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static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
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{
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return of_bus_default_translate(addr + 1, offset, na - 1);
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}
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static unsigned int of_bus_isa_get_flags(const u32 *addr)
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{
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unsigned int flags = 0;
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u32 w = addr[0];
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if (w & 1)
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flags |= IORESOURCE_IO;
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else
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flags |= IORESOURCE_MEM;
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return flags;
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}
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/*
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* Array of bus specific translators
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*/
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static struct of_bus of_busses[] = {
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#ifdef CONFIG_PCI
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/* PCI */
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{
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.name = "pci",
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.addresses = "assigned-addresses",
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.match = of_bus_pci_match,
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.count_cells = of_bus_pci_count_cells,
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.map = of_bus_pci_map,
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.translate = of_bus_pci_translate,
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.get_flags = of_bus_pci_get_flags,
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},
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#endif /* CONFIG_PCI */
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/* ISA */
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{
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.name = "isa",
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.addresses = "reg",
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.match = of_bus_isa_match,
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.count_cells = of_bus_isa_count_cells,
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.map = of_bus_isa_map,
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.translate = of_bus_isa_translate,
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.get_flags = of_bus_isa_get_flags,
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},
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/* Default */
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{
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.name = "default",
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.addresses = "reg",
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.match = NULL,
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.count_cells = of_bus_default_count_cells,
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.map = of_bus_default_map,
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.translate = of_bus_default_translate,
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.get_flags = of_bus_default_get_flags,
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},
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};
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static struct of_bus *of_match_bus(struct device_node *np)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(of_busses); i++)
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if (!of_busses[i].match || of_busses[i].match(np))
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return &of_busses[i];
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BUG();
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return NULL;
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}
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static int of_translate_one(struct device_node *parent, struct of_bus *bus,
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struct of_bus *pbus, u32 *addr,
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int na, int ns, int pna)
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{
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const u32 *ranges;
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unsigned int rlen;
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int rone;
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u64 offset = OF_BAD_ADDR;
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/* Normally, an absence of a "ranges" property means we are
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* crossing a non-translatable boundary, and thus the addresses
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* below the current not cannot be converted to CPU physical ones.
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* Unfortunately, while this is very clear in the spec, it's not
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* what Apple understood, and they do have things like /uni-n or
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* /ht nodes with no "ranges" property and a lot of perfectly
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* useable mapped devices below them. Thus we treat the absence of
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* "ranges" as equivalent to an empty "ranges" property which means
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* a 1:1 translation at that level. It's up to the caller not to try
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* to translate addresses that aren't supposed to be translated in
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* the first place. --BenH.
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*/
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ranges = of_get_property(parent, "ranges", (int *) &rlen);
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if (ranges == NULL || rlen == 0) {
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offset = of_read_number(addr, na);
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memset(addr, 0, pna * 4);
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pr_debug("OF: no ranges, 1:1 translation\n");
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goto finish;
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}
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pr_debug("OF: walking ranges...\n");
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/* Now walk through the ranges */
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rlen /= 4;
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rone = na + pna + ns;
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for (; rlen >= rone; rlen -= rone, ranges += rone) {
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offset = bus->map(addr, ranges, na, ns, pna);
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if (offset != OF_BAD_ADDR)
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break;
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}
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if (offset == OF_BAD_ADDR) {
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pr_debug("OF: not found !\n");
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return 1;
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}
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memcpy(addr, ranges + na, 4 * pna);
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finish:
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of_dump_addr("OF: parent translation for:", addr, pna);
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pr_debug("OF: with offset: "PRu64"\n", offset);
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/* Translate it into parent bus space */
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return pbus->translate(addr, offset, pna);
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}
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/*
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* Translate an address from the device-tree into a CPU physical address,
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* this walks up the tree and applies the various bus mappings on the
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* way.
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*
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* Note: We consider that crossing any level with #size-cells == 0 to mean
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* that translation is impossible (that is we are not dealing with a value
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* that can be mapped to a cpu physical address). This is not really specified
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* that way, but this is traditionally the way IBM at least do things
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*/
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u64 of_translate_address(struct device_node *dev, const u32 *in_addr)
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{
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struct device_node *parent = NULL;
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struct of_bus *bus, *pbus;
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u32 addr[OF_MAX_ADDR_CELLS];
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int na, ns, pna, pns;
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u64 result = OF_BAD_ADDR;
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pr_debug("OF: ** translation for device %s **\n", dev->full_name);
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/* Increase refcount at current level */
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of_node_get(dev);
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/* Get parent & match bus type */
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parent = of_get_parent(dev);
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if (parent == NULL)
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goto bail;
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bus = of_match_bus(parent);
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/* Cound address cells & copy address locally */
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bus->count_cells(dev, &na, &ns);
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if (!OF_CHECK_COUNTS(na, ns)) {
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printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
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dev->full_name);
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goto bail;
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}
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memcpy(addr, in_addr, na * 4);
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pr_debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
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bus->name, na, ns, parent->full_name);
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of_dump_addr("OF: translating address:", addr, na);
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/* Translate */
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for (;;) {
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/* Switch to parent bus */
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of_node_put(dev);
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dev = parent;
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parent = of_get_parent(dev);
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/* If root, we have finished */
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if (parent == NULL) {
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pr_debug("OF: reached root node\n");
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result = of_read_number(addr, na);
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break;
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}
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/* Get new parent bus and counts */
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pbus = of_match_bus(parent);
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pbus->count_cells(dev, &pna, &pns);
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if (!OF_CHECK_COUNTS(pna, pns)) {
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printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
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dev->full_name);
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break;
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}
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|
|
pr_debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
|
|
pbus->name, pna, pns, parent->full_name);
|
|
|
|
/* Apply bus translation */
|
|
if (of_translate_one(dev, bus, pbus, addr, na, ns, pna))
|
|
break;
|
|
|
|
/* Complete the move up one level */
|
|
na = pna;
|
|
ns = pns;
|
|
bus = pbus;
|
|
|
|
of_dump_addr("OF: one level translation:", addr, na);
|
|
}
|
|
bail:
|
|
of_node_put(parent);
|
|
of_node_put(dev);
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL(of_translate_address);
|
|
|
|
const u32 *of_get_address(struct device_node *dev, int index, u64 *size,
|
|
unsigned int *flags)
|
|
{
|
|
const u32 *prop;
|
|
unsigned int psize;
|
|
struct device_node *parent;
|
|
struct of_bus *bus;
|
|
int onesize, i, na, ns;
|
|
|
|
/* Get parent & match bus type */
|
|
parent = of_get_parent(dev);
|
|
if (parent == NULL)
|
|
return NULL;
|
|
bus = of_match_bus(parent);
|
|
bus->count_cells(dev, &na, &ns);
|
|
of_node_put(parent);
|
|
if (!OF_CHECK_COUNTS(na, ns))
|
|
return NULL;
|
|
|
|
/* Get "reg" or "assigned-addresses" property */
|
|
prop = of_get_property(dev, bus->addresses, (int *) &psize);
|
|
if (prop == NULL)
|
|
return NULL;
|
|
psize /= 4;
|
|
|
|
onesize = na + ns;
|
|
for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
|
|
if (i == index) {
|
|
if (size)
|
|
*size = of_read_number(prop + na, ns);
|
|
if (flags)
|
|
*flags = bus->get_flags(prop);
|
|
return prop;
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(of_get_address);
|
|
|
|
static int __of_address_to_resource(struct device_node *dev, const u32 *addrp,
|
|
u64 size, unsigned int flags,
|
|
struct resource *r)
|
|
{
|
|
u64 taddr;
|
|
|
|
if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
|
|
return -EINVAL;
|
|
taddr = of_translate_address(dev, addrp);
|
|
if (taddr == OF_BAD_ADDR)
|
|
return -EINVAL;
|
|
memset(r, 0, sizeof(struct resource));
|
|
if (flags & IORESOURCE_IO) {
|
|
unsigned long port;
|
|
port = -1; /* pci_address_to_pio(taddr); */
|
|
if (port == (unsigned long)-1)
|
|
return -EINVAL;
|
|
r->start = port;
|
|
r->end = port + size - 1;
|
|
} else {
|
|
r->start = taddr;
|
|
r->end = taddr + size - 1;
|
|
}
|
|
r->flags = flags;
|
|
r->name = dev->name;
|
|
return 0;
|
|
}
|
|
|
|
int of_address_to_resource(struct device_node *dev, int index,
|
|
struct resource *r)
|
|
{
|
|
const u32 *addrp;
|
|
u64 size;
|
|
unsigned int flags;
|
|
|
|
addrp = of_get_address(dev, index, &size, &flags);
|
|
if (addrp == NULL)
|
|
return -EINVAL;
|
|
return __of_address_to_resource(dev, addrp, size, flags, r);
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_address_to_resource);
|
|
|
|
void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
|
|
unsigned long *busno, unsigned long *phys, unsigned long *size)
|
|
{
|
|
const u32 *dma_window;
|
|
u32 cells;
|
|
const unsigned char *prop;
|
|
|
|
dma_window = dma_window_prop;
|
|
|
|
/* busno is always one cell */
|
|
*busno = *(dma_window++);
|
|
|
|
prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
|
|
if (!prop)
|
|
prop = of_get_property(dn, "#address-cells", NULL);
|
|
|
|
cells = prop ? *(u32 *)prop : of_n_addr_cells(dn);
|
|
*phys = of_read_number(dma_window, cells);
|
|
|
|
dma_window += cells;
|
|
|
|
prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
|
|
cells = prop ? *(u32 *)prop : of_n_size_cells(dn);
|
|
*size = of_read_number(dma_window, cells);
|
|
}
|
|
|
|
/**
|
|
* Search the device tree for the best MAC address to use. 'mac-address' is
|
|
* checked first, because that is supposed to contain to "most recent" MAC
|
|
* address. If that isn't set, then 'local-mac-address' is checked next,
|
|
* because that is the default address. If that isn't set, then the obsolete
|
|
* 'address' is checked, just in case we're using an old device tree.
|
|
*
|
|
* Note that the 'address' property is supposed to contain a virtual address of
|
|
* the register set, but some DTS files have redefined that property to be the
|
|
* MAC address.
|
|
*
|
|
* All-zero MAC addresses are rejected, because those could be properties that
|
|
* exist in the device tree, but were not set by U-Boot. For example, the
|
|
* DTS could define 'mac-address' and 'local-mac-address', with zero MAC
|
|
* addresses. Some older U-Boots only initialized 'local-mac-address'. In
|
|
* this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
|
|
* but is all zeros.
|
|
*/
|
|
const void *of_get_mac_address(struct device_node *np)
|
|
{
|
|
struct property *pp;
|
|
|
|
pp = of_find_property(np, "mac-address", NULL);
|
|
if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
|
|
return pp->value;
|
|
|
|
pp = of_find_property(np, "local-mac-address", NULL);
|
|
if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
|
|
return pp->value;
|
|
|
|
pp = of_find_property(np, "address", NULL);
|
|
if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
|
|
return pp->value;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(of_get_mac_address);
|