arch/powerpc/include/asm/prom.h

   1 #include <linux/of.h>   /* linux/of.h gets to determine #include ordering */
   2 #ifndef _POWERPC_PROM_H
   3 #define _POWERPC_PROM_H
   4 #ifdef __KERNEL__
   5
   6 /*
   7  * Definitions for talking to the Open Firmware PROM on
   8  * Power Macintosh computers.
   9  *
  10  * Copyright (C) 1996-2005 Paul Mackerras.
  11  *
  12  * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version
  17  * 2 of the License, or (at your option) any later version.
  18  */
  19 #include <linux/types.h>
  20 #include <linux/of_fdt.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/platform_device.h>
  23 #include <asm/irq.h>
  24 #include <asm/atomic.h>
  25
  26 #define HAVE_ARCH_DEVTREE_FIXUPS
  27
  28 #ifdef CONFIG_PPC32
  29 /*
  30  * PCI <-> OF matching functions
  31  * (XXX should these be here?)
  32  */
  33 struct pci_bus;
  34 struct pci_dev;
  35 extern int pci_device_from_OF_node(struct device_node *node,
  36                                    u8* bus, u8* devfn);
  37 extern struct device_node* pci_busdev_to_OF_node(struct pci_bus *, int);
  38 extern struct device_node* pci_device_to_OF_node(struct pci_dev *);
  39 extern void pci_create_OF_bus_map(void);
  40 #endif
  41
  42 /*
  43  * OF address retreival & translation
  44  */
  45
  46 /* Translate an OF address block into a CPU physical address
  47  */
  48 extern u64 of_translate_address(struct device_node *np, const u32 *addr);
  49
  50 /* Translate a DMA address from device space to CPU space */
  51 extern u64 of_translate_dma_address(struct device_node *dev,
  52                                     const u32 *in_addr);
  53
  54 /* Extract an address from a device, returns the region size and
  55  * the address space flags too. The PCI version uses a BAR number
  56  * instead of an absolute index
  57  */
  58 extern const u32 *of_get_address(struct device_node *dev, int index,
  59                            u64 *size, unsigned int *flags);
  60 #ifdef CONFIG_PCI
  61 extern const u32 *of_get_pci_address(struct device_node *dev, int bar_no,
  62                                u64 *size, unsigned int *flags);
  63 #else
  64 static inline const u32 *of_get_pci_address(struct device_node *dev,
  65                 int bar_no, u64 *size, unsigned int *flags)
  66 {
  67         return NULL;
  68 }
  69 #endif /* CONFIG_PCI */
  70
  71 /* Get an address as a resource. Note that if your address is
  72  * a PIO address, the conversion will fail if the physical address
  73  * can't be internally converted to an IO token with
  74  * pci_address_to_pio(), that is because it's either called to early
  75  * or it can't be matched to any host bridge IO space
  76  */
  77 extern int of_address_to_resource(struct device_node *dev, int index,
  78                                   struct resource *r);
  79 #ifdef CONFIG_PCI
  80 extern int of_pci_address_to_resource(struct device_node *dev, int bar,
  81                                       struct resource *r);
  82 #else
  83 static inline int of_pci_address_to_resource(struct device_node *dev, int bar,
  84                 struct resource *r)
  85 {
  86         return -ENOSYS;
  87 }
  88 #endif /* CONFIG_PCI */
  89
  90 /* Parse the ibm,dma-window property of an OF node into the busno, phys and
  91  * size parameters.
  92  */
  93 void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
  94                 unsigned long *busno, unsigned long *phys, unsigned long *size);
  95
  96 extern void kdump_move_device_tree(void);
  97
  98 /* CPU OF node matching */
  99 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
 100
 101 /* cache lookup */
 102 struct device_node *of_find_next_cache_node(struct device_node *np);
 103
 104 /* Get the MAC address */
 105 extern const void *of_get_mac_address(struct device_node *np);
 106
 107 /*
 108  * OF interrupt mapping
 109  */
 110
 111 /* This structure is returned when an interrupt is mapped. The controller
 112  * field needs to be put() after use
 113  */
 114
 115 #define OF_MAX_IRQ_SPEC          4 /* We handle specifiers of at most 4 cells */
 116
 117 struct of_irq {
 118         struct device_node *controller; /* Interrupt controller node */
 119         u32 size;                       /* Specifier size */
 120         u32 specifier[OF_MAX_IRQ_SPEC]; /* Specifier copy */
 121 };
 122
 123 /**
 124  * of_irq_map_init - Initialize the irq remapper
 125  * @flags:      flags defining workarounds to enable
 126  *
 127  * Some machines have bugs in the device-tree which require certain workarounds
 128  * to be applied. Call this before any interrupt mapping attempts to enable
 129  * those workarounds.
 130  */
 131 #define OF_IMAP_OLDWORLD_MAC    0x00000001
 132 #define OF_IMAP_NO_PHANDLE      0x00000002
 133
 134 extern void of_irq_map_init(unsigned int flags);
 135
 136 /**
 137  * of_irq_map_raw - Low level interrupt tree parsing
 138  * @parent:     the device interrupt parent
 139  * @intspec:    interrupt specifier ("interrupts" property of the device)
 140  * @ointsize:   size of the passed in interrupt specifier
 141  * @addr:       address specifier (start of "reg" property of the device)
 142  * @out_irq:    structure of_irq filled by this function
 143  *
 144  * Returns 0 on success and a negative number on error
 145  *
 146  * This function is a low-level interrupt tree walking function. It
 147  * can be used to do a partial walk with synthetized reg and interrupts
 148  * properties, for example when resolving PCI interrupts when no device
 149  * node exist for the parent.
 150  *
 151  */
 152
 153 extern int of_irq_map_raw(struct device_node *parent, const u32 *intspec,
 154                           u32 ointsize, const u32 *addr,
 155                           struct of_irq *out_irq);
 156
 157
 158 /**
 159  * of_irq_map_one - Resolve an interrupt for a device
 160  * @device:     the device whose interrupt is to be resolved
 161  * @index:      index of the interrupt to resolve
 162  * @out_irq:    structure of_irq filled by this function
 163  *
 164  * This function resolves an interrupt, walking the tree, for a given
 165  * device-tree node. It's the high level pendant to of_irq_map_raw().
 166  * It also implements the workarounds for OldWolrd Macs.
 167  */
 168 extern int of_irq_map_one(struct device_node *device, int index,
 169                           struct of_irq *out_irq);
 170
 171 /**
 172  * of_irq_map_pci - Resolve the interrupt for a PCI device
 173  * @pdev:       the device whose interrupt is to be resolved
 174  * @out_irq:    structure of_irq filled by this function
 175  *
 176  * This function resolves the PCI interrupt for a given PCI device. If a
 177  * device-node exists for a given pci_dev, it will use normal OF tree
 178  * walking. If not, it will implement standard swizzling and walk up the
 179  * PCI tree until an device-node is found, at which point it will finish
 180  * resolving using the OF tree walking.
 181  */
 182 struct pci_dev;
 183 extern int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq);
 184
 185 extern int of_irq_to_resource(struct device_node *dev, int index,
 186                         struct resource *r);
 187
 188 /**
 189  * of_iomap - Maps the memory mapped IO for a given device_node
 190  * @device:     the device whose io range will be mapped
 191  * @index:      index of the io range
 192  *
 193  * Returns a pointer to the mapped memory
 194  */
 195 extern void __iomem *of_iomap(struct device_node *device, int index);
 196
 197 #endif /* __KERNEL__ */
 198 #endif /* _POWERPC_PROM_H */