![Paul Mackerras](/assets/img/avatar_default.png)
The first generation of PCI powermacs had a host bridge called /chaos which was for all intents and purposes a PCI host bridge, but has a device_type of "vci" in the device tree (presumably it's not really PCI at the hardware level or something). The OF parsing stuff in arch/powerpc/kernel/prom_parse.c currently doesn't recognize it as a PCI bridge, which means that controlfb.c can't get its device addresses. This makes prom_parse.c recognize a device_type of "vci" as indicating a PCI host bridge. With this, controlfb works again. Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
549 lines
12 KiB
C
549 lines
12 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 <asm/prom.h>
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#include <asm/pci-bridge.h>
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#ifdef DEBUG
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#define DBG(fmt...) do { printk(fmt); } while(0)
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#else
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#define DBG(fmt...) do { } while(0)
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#endif
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#ifdef CONFIG_PPC64
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#define PRu64 "%lx"
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#else
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#define PRu64 "%llx"
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#endif
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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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/* Debug utility */
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#ifdef DEBUG
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static void of_dump_addr(const char *s, u32 *addr, int na)
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{
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printk("%s", s);
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while(na--)
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printk(" %08x", *(addr++));
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printk("\n");
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}
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#else
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static void of_dump_addr(const char *s, u32 *addr, int na) { }
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#endif
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/* Read a big address */
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static inline u64 of_read_addr(u32 *cell, int size)
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{
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u64 r = 0;
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while (size--)
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r = (r << 32) | *(cell++);
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return r;
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}
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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, u32 *range, 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)(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 = prom_n_addr_cells(dev);
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if (sizec)
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*sizec = prom_n_size_cells(dev);
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}
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static u64 of_bus_default_map(u32 *addr, u32 *range, 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_addr(range, na);
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s = of_read_addr(range + na + pna, ns);
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da = of_read_addr(addr, na);
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DBG("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_addr(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(u32 *addr)
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{
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return IORESOURCE_MEM;
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}
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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, 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_addr(range + 1, na - 1);
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s = of_read_addr(range + na + pna, ns);
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da = of_read_addr(addr + 1, na - 1);
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DBG("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(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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case 0x02: /* 32 bits */
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case 0x03: /* 64 bits */
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flags |= IORESOURCE_MEM;
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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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/*
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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, 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_addr(range + 1, na - 1);
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s = of_read_addr(range + na + pna, ns);
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da = of_read_addr(addr + 1, na - 1);
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DBG("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(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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/* 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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/* 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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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 = (u32 *)get_property(parent, "ranges", &rlen);
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if (ranges == NULL || rlen == 0) {
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offset = of_read_addr(addr, na);
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memset(addr, 0, pna * 4);
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DBG("OF: no ranges, 1:1 translation\n");
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goto finish;
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}
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DBG("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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DBG("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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DBG("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, 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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DBG("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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DBG("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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DBG("OF: reached root node\n");
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result = of_read_addr(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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DBG("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
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pbus->name, pna, pns, parent->full_name);
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/* Apply bus translation */
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if (of_translate_one(dev, bus, pbus, addr, na, ns, pna))
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break;
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/* Complete the move up one level */
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na = pna;
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ns = pns;
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bus = pbus;
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of_dump_addr("OF: one level translation:", addr, na);
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}
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bail:
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of_node_put(parent);
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of_node_put(dev);
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return result;
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}
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EXPORT_SYMBOL(of_translate_address);
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u32 *of_get_address(struct device_node *dev, int index, u64 *size,
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unsigned int *flags)
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{
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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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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 = (u32 *)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 (i == index) {
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if (size)
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*size = of_read_addr(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_address);
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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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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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return NULL;
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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 = (u32 *)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_addr(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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static int __of_address_to_resource(struct device_node *dev, u32 *addrp,
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u64 size, unsigned int flags,
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struct resource *r)
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{
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u64 taddr;
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if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
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return -EINVAL;
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taddr = of_translate_address(dev, addrp);
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if (taddr == OF_BAD_ADDR)
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return -EINVAL;
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memset(r, 0, sizeof(struct resource));
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if (flags & IORESOURCE_IO) {
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unsigned long port;
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port = pci_address_to_pio(taddr);
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if (port == (unsigned long)-1)
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return -EINVAL;
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r->start = port;
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r->end = port + size - 1;
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} else {
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r->start = taddr;
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r->end = taddr + size - 1;
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}
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r->flags = flags;
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r->name = dev->name;
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return 0;
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|
}
|
|
|
|
int of_address_to_resource(struct device_node *dev, int index,
|
|
struct resource *r)
|
|
{
|
|
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);
|
|
|
|
int of_pci_address_to_resource(struct device_node *dev, int bar,
|
|
struct resource *r)
|
|
{
|
|
u32 *addrp;
|
|
u64 size;
|
|
unsigned int flags;
|
|
|
|
addrp = of_get_pci_address(dev, bar, &size, &flags);
|
|
if (addrp == NULL)
|
|
return -EINVAL;
|
|
return __of_address_to_resource(dev, addrp, size, flags, r);
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
|